API.md: revise documentation to be more consistent

Signed-off-by: Christina Wen <christina@tailscale.com>
API.md: release API documentation
2021-01-05 14:28:14 -05:00 · 2021-01-05 13:37:11 -05:00
81 changed files with 867 additions and 3823 deletions
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,48 +0,0 @@
-name: Code Coverage
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - '*'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    if: "!contains(github.event.head_commit.message, '[ci skip]')"
-
-    steps:
-
-    - name: Set up Go
-      uses: actions/setup-go@v1
-      with:
-        go-version: 1.15
-      id: go
-
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
-
-      # https://markphelps.me/2019/11/speed-up-your-go-builds-with-actions-cache/
-    - name: Restore Cache
-      uses: actions/cache@preview
-      id: cache
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-${{ hashFiles('**/go.sum') }}
-
-    - name: Basic build
-      run: go build ./cmd/...
-
-    - name: Run tests on linux with coverage data
-      run: go test -race -coverprofile=coverage.txt -bench=. -benchtime=1x ./...
-
-    - name: coveralls.io
-      uses: shogo82148/actions-goveralls@v1
-      env:
-        COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
-        GITHUB_TOKEN: ${{ secrets.COVERALLS_BOT_PUBLIC_REPO_TOKEN }}
-      with:
-        path-to-profile: ./coverage.txt
--- a/17
+++ b/17
@@ -2,23 +2,6 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.

-############################################################################
-#
-# WARNING: Tailscale is not yet officially supported in Docker,
-# Kubernetes, etc.
-#
-# It might work, but we don't regularly test it, and it's not as polished as
-# our currently supported platforms. This is provided for people who know
-# how Tailscale works and what they're doing.
-#
-# Our tracking bug for officially support container use cases is:
-#    https://github.com/tailscale/tailscale/issues/504
-#
-# Also, see the various bugs tagged "containers":
-#    https://github.com/tailscale/tailscale/labels/containers
-#
-############################################################################
-
 # This Dockerfile includes all the tailscale binaries.
 #
 # To build the Dockerfile:
--- a/README.md
+++ b/README.md
@@ -63,13 +63,8 @@ Origin](https://en.wikipedia.org/wiki/Developer_Certificate_of_Origin)

 ## About Us

-[Tailscale](https://tailscale.com/) is primarily developed by the
-people at https://github.com/orgs/tailscale/people. For other contributors,
-see:
-
-* https://github.com/tailscale/tailscale/graphs/contributors
-* https://github.com/tailscale/tailscale-android/graphs/contributors
-
-## Legal
+We are apenwarr, bradfitz, crawshaw, danderson, dfcarney, josharian
+from Tailscale Inc.
+You can learn more about us from [our website](https://tailscale.com).

 WireGuard is a registered trademark of Jason A. Donenfeld.
--- a/api.md
+++ b/api.md
@@ -5,39 +5,10 @@ The Tailscale API is a (mostly) RESTful API. Typically, POST bodies should be JS
 # Authentication
 Currently based on {some authentication method}. Visit the [admin panel](https://api.tailscale.com/admin) and navigate to the `Keys` page. Generate an API Key and keep it safe. Provide the key as the user key in basic auth when making calls to Tailscale API endpoints.

-# APIs
-
-* **[Devices](#device)**
-  - [GET device](#device-get)
-  - [DELETE device](#device-delete)
-  - Routes
-    - [GET device routes](#device-routes-get)
-    - [POST device routes](#device-routes-post)
-* **[Tailnets](#tailnet)**
-  - ACLs
-    - [GET tailnet ACL](#tailnet-acl-get)
-    - [POST tailnet ACL](#tailnet-acl-post): set ACL for a tailnet
-    - [POST tailnet ACL preview](#tailnet-acl-preview-post): preview rule matches on an ACL for a resource
-  - [Devices](#tailnet-devices)
-    - [GET tailnet devices](#tailnet-devices-get)
-  - [DNS](#tailnet-dns)
-    - [GET tailnet DNS nameservers](#tailnet-dns-nameservers-get)
-    - [POST tailnet DNS nameservers](#tailnet-dns-nameservers-post)
-    - [GET tailnet DNS preferences](#tailnet-dns-preferences-get)
-    - [POST tailnet DNS preferences](#tailnet-dns-preferences-post)
-    - [GET tailnet DNS searchpaths](#tailnet-dns-searchpaths-get)
-    - [POST tailnet DNS searchpaths](#tailnet-dns-searchpaths-post)
+# APIS

 ## Device
 <!-- TODO: description about what devices are -->
-Each Tailscale-connected device has a globally-unique identifier number which we refer as the "deviceID" or sometimes, just "id". 
-You can use the deviceID to specify operations on a specific device, like retrieving its subnet routes.
-
-To find the deviceID of a particular device, you can use the ["GET /devices"](#getdevices) API call and generate a list of devices on your network. 
-Find the device you're looking for and get the "id" field.
-This is your deviceID. 
-
-<a name=device-get></div>

 #### `GET /api/v2/device/:deviceid` - lists the details for a device
 Returns the details for the specified device.
@@ -63,7 +34,7 @@ If the `fields` parameter is not provided, then the default option is used.
 ##### Example 
 ```
 GET /api/v2/device/12345
-curl 'https://api.tailscale.com/api/v2/device/12345?fields=all' \
+curl https://api.tailscale.com/api/v2/device/12345?fields=all \
  -u "tskey-yourapikey123:"
 ```

@@ -126,45 +97,6 @@ Response
 }
 ```

-<a name=device-delete></div>
-
-#### `DELETE /api/v2/device/:deviceID` - deletes the device from its tailnet
-Deletes the provided device from its tailnet. 
-The device must belong to the user's tailnet.
-Deleting shared/external devices is not supported.
-Supply the device of interest in the path using its ID.
-
-
-##### Parameters
-No parameters.
-
-##### Example
-```
-DELETE /api/v2/device/12345
-curl -X DELETE 'https://api.tailscale.com/api/v2/device/12345' \
-  -u "tskey-yourapikey123:" -v
-```
-
-Response
-
-If successful, the response should be empty: 
-```
-< HTTP/1.1 200 OK
-...
-* Connection #0 to host left intact
-* Closing connection 0
-```
-
-If the device is not owned by your tailnet: 
-```
-< HTTP/1.1 501 Not Implemented
-...
-{"message":"cannot delete devices outside of your tailnet"}
-```
-
-
-<a name=device-routes-get></div>
-
 #### `GET /api/v2/device/:deviceID/routes` - fetch subnet routes that are advertised and enabled for a device

 Retrieves the list of subnet routes that a device is advertising, as well as those that are enabled for it. Enabled routes are not necessarily advertised (e.g. for pre-enabling), and likewise, advertised routes are not necessarily enabled.
@@ -176,7 +108,7 @@ No parameters.
 ##### Example

 ```
-curl 'https://api.tailscale.com/api/v2/device/11055/routes' \
+curl https://api.tailscale.com/api/v2/device/11055/routes \
 -u "tskey-yourapikey123:"
 ```

@@ -192,8 +124,6 @@ Response
 }
 ```

-<a name=device-routes-post></div>
-
 #### `POST /api/v2/device/:deviceID/routes` - set the subnet routes that are enabled for a device

 Sets which subnet routes are enabled to be routed by a device by replacing the existing list of subnet routes with the supplied parameters. Routes can be enabled without a device advertising them (e.g. for preauth). Returns a list of enabled subnet routes and a list of advertised subnet routes for a device.
@@ -211,7 +141,7 @@ Sets which subnet routes are enabled to be routed by a device by replacing the e
 ##### Example

 ```
-curl 'https://api.tailscale.com/api/v2/device/11055/routes' \
+curl https://api.tailscale.com/api/v2/device/11055/routes \
 -u "tskey-yourapikey123:" \
 --data-binary '{"routes": ["10.0.1.0/24", "1.2.0.0/16", "2.0.0.0/24"]}'
 ```
@@ -233,38 +163,17 @@ Response
 }
 ```

-## Tailnet 
-A tailnet is the name of your Tailscale network. 
-You can find it in the top left corner of the [Admin Panel](https://login.tailscale.com/admin) beside the Tailscale logo.
-
-
-`alice@example.com` belongs to the `example.com` tailnet and would use the following format for API calls:
-
-```
-GET /api/v2/tailnet/example.com/...
-curl https://api.tailscale.com/api/v2/tailnet/example.com/...
-```
-
-
-For solo plans, the tailnet is the email you signed up with.
-So `alice@gmail.com` has the tailnet `alice@gmail.com` since `@gmail.com` is a shared email host.
-Her API calls would have the following format:
-```
-GET /api/v2/tailnet/alice@gmail.com/...
-curl https://api.tailscale.com/api/v2/tailnet/alice@gmail.com/...
-```
-
-Tailnets are a top-level resource. ACL is an example of a resource that is tied to a top-level tailnet.
-
-For more information on Tailscale networks/tailnets, click [here](https://tailscale.com/kb/1064/invite-team-members).
+## Domain
+<!---
+TODO: ctrl+f domain, replace with {workgroup/tailnet/other}
+Domain is a top level resource. ACL is an example of a resource that is tied to a top level domain.
+--->

 ### ACL

-<a name=tailnet-acl-get></a>
+#### `GET /api/v2/domain/:domain/acl` - fetch ACL for a domain

-#### `GET /api/v2/tailnet/:tailnet/acl` - fetch ACL for a tailnet
-
-Retrieves the ACL that is currently set for the given tailnet. Supply the tailnet of interest in the path. This endpoint can send back either the HuJSON of the ACL or a parsed JSON, depending on the `Accept` header.
+Retrieves the ACL that is currently set for the given domain. Supply the domain of interest in the path. This endpoint can send back either the HuJSON of the ACL or a parsed JSON, depending on the `Accept` header.

 ##### Parameters

@@ -279,8 +188,8 @@ Returns the ACL HuJSON by default. Returns a parsed JSON of the ACL (sans commen

 ###### Requesting a HuJSON response:
 ```
-GET /api/v2/tailnet/example.com/acl
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl' \
+GET /api/v2/domain/example.com/acl
+curl https://api.tailscale.com/api/v2/domain/example.com/acl \
  -u "tskey-yourapikey123:" \
  -H "Accept: application/hujson" \
  -v
@@ -326,8 +235,8 @@ Etag: "e0b2816b418b3f266309d94426ac7668ab3c1fa87798785bf82f1085cc2f6d9c"

 ###### Requesting a JSON response:
 ```
-GET /api/v2/tailnet/example.com/acl
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl' \
+GET /api/v2/domain/example.com/acl
+curl https://api.tailscale.com/api/v2/domain/example.com/acl \
  -u "tskey-yourapikey123:" \
  -H "Accept: application/json" \
  -v
@@ -363,11 +272,9 @@ Etag: "e0b2816b418b3f266309d94426ac7668ab3c1fa87798785bf82f1085cc2f6d9c"
 }
 ```

-<a name=tailnet-acl-post></a>
+#### `POST /api/v2/domain/:domain/acl` - set ACL for a domain

-#### `POST /api/v2/tailnet/:tailnet/acl` - set ACL for a tailnet
-
-Sets the ACL for the given tailnet. HuJSON and JSON are both accepted inputs. An `If-Match` header can be set to avoid missed updates.
+Sets the ACL for the given domain. HuJSON and JSON are both accepted inputs. An `If-Match` header can be set to avoid missed updates.

 Returns error for invalid ACLs.
 Returns error if using an `If-Match` header and the ETag does not match.
@@ -384,8 +291,8 @@ ACL JSON or HuJSON (see https://tailscale.com/kb/1018/acls)

 ##### Example
 ```
-POST /api/v2/tailnet/example.com/acl
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl' \
+POST /api/v2/domain/example.com/acl
+curl https://api.tailscale.com/api/v2/domain/example.com/acl \
  -u "tskey-yourapikey123:" \
  -H "If-Match: \"e0b2816b418b3f266309d94426ac7668ab3c1fa87798785bf82f1085cc2f6d9c\""
  --data-binary '// Example/default ACLs for unrestricted connections.
@@ -436,9 +343,7 @@ Response
 }
 ```

-<a name=tailnet-acl-preview-post></a>
-
-#### `POST /api/v2/tailnet/:tailnet/acl/preview` - preview rule matches on an ACL for a resource
+#### `POST /api/v2/domain/:domain/acl/preview` - preview rule matches on an ACL for a resource
 Determines what rules match for a user on an ACL without saving the ACL to the server.

 ##### Parameters
@@ -451,8 +356,8 @@ ACL JSON or HuJSON (see https://tailscale.com/kb/1018/acls)

 ##### Example
 ```
-POST /api/v2/tailnet/example.com/acl/preiew
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl?user=user1@example.com' \
+POST /api/v2/domain/example.com/acl/preiew
+curl https://api.tailscale.com/api/v2/domain/example.com/acl?user=user1@example.com \
  -u "tskey-yourapikey123:" \
  --data-binary '// Example/default ACLs for unrestricted connections.
 {
@@ -482,15 +387,10 @@ Response
 {"matches":[{"users":["*"],"ports":["*:*"],"lineNumber":19}],"user":"user1@example.com"}
 ```

-<a name=tailnet-devices></a>
-
 ### Devices
-
-<a name=tailnet-devices-get></a>
-
-#### <a name="getdevices"></a> `GET /api/v2/tailnet/:tailnet/devices` - list the devices for a tailnet
-Lists the devices in a tailnet. 
-Supply the tailnet of interest in the path.
+#### `GET /api/v2/domain/:domain/devices` - list the devices for a domain
+Lists the devices for a domain. 
+Supply the domain of interest in the path.
 Use the `fields` query parameter to explicitly indicate which fields are returned.


@@ -513,8 +413,8 @@ If the `fields` parameter is not provided, then the default option is used.
 ##### Example

 ```
-GET /api/v2/tailnet/example.com/devices
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/devices' \
+GET /api/v2/domain/example.com/devices
+curl https://api.tailscale.com/api/v2/domain/example.com/devices \
  -u "tskey-yourapikey123:"
 ```

@@ -568,15 +468,12 @@ Response
 }
 ```

-<a name=tailnet-dns></a>

 ### DNS

-<a name=tailnet-dns-nameservers-get></a>
-
-#### `GET /api/v2/tailnet/:tailnet/dns/nameservers` - list the DNS nameservers for a tailnet
-Lists the DNS nameservers for a tailnet. 
-Supply the tailnet of interest in the path.
+#### `GET /api/v2/domain/:domain/dns/nameservers` - list the DNS nameservers for a domain
+Lists the DNS nameservers for a domain. 
+Supply the domain of interest in the path.

 ##### Parameters
 No parameters.
@@ -584,8 +481,8 @@ No parameters.
 ##### Example 

 ```
-GET /api/v2/tailnet/example.com/dns/nameservers
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/nameservers' \
+GET /api/v2/domain/example.com/dns/nameservers
+curl https://api.tailscale.com/api/v2/domain/example.com/dns/nameservers \
  -u "tskey-yourapikey123:"
 ```

@@ -596,11 +493,9 @@ Response
 }
 ```

-<a name=tailnet-dns-nameservers-post></a>
-
-#### `POST /api/v2/tailnet/:tailnet/dns/nameservers` - replaces the list of DNS nameservers for a tailnet
-Replaces the list of DNS nameservers for the given tailnet with the list supplied by the user. 
-Supply the tailnet of interest in the path.
+#### `POST /api/v2/domain/:domain/dns/nameservers` - replaces the list of DNS nameservers for a domain
+Replaces the list of DNS nameservers for the given domain with the list supplied by the user. 
+Supply the domain of interest in the path.
 Note that changing the list of DNS nameservers may also affect the status of MagicDNS (if MagicDNS is on).

 ##### Parameters
@@ -620,8 +515,8 @@ If all nameservers have been removed, MagicDNS will be automatically disabled (u
 ##### Example
 ###### Adding DNS nameservers with the MagicDNS on:
 ```
-POST /api/v2/tailnet/example.com/dns/nameservers
-curl -X POST 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/nameservers' \
+POST /api/v2/domain/example.com/dns/nameservers
+curl -X POST 'https://api.tailscale.com/api/v2/domain/example.com/dns/nameservers' \
  -u "tskey-yourapikey123:" \
  --data-binary '{"dns": ["8.8.8.8"]}'
 ```
@@ -636,8 +531,8 @@ Response:

 ###### Removing all DNS nameservers with the MagicDNS on:
 ```
-POST /api/v2/tailnet/example.com/dns/nameservers
-curl -X POST 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/nameservers' \
+POST /api/v2/domain/example.com/dns/nameservers
+curl -X POST 'https://api.tailscale.com/api/v2/domain/example.com/dns/nameservers' \
  -u "tskey-yourapikey123:" \
  --data-binary '{"dns": []}'
 ```
@@ -650,19 +545,17 @@ Response:
 }
 ```

-<a name=tailnet-dns-preferences-get></a>
-
-#### `GET /api/v2/tailnet/:tailnet/dns/preferences` - retrieves the DNS preferences for a tailnet
-Retrieves the DNS preferences that are currently set for the given tailnet.
-Supply the tailnet of interest in the path.
+#### `GET /api/v2/domain/:domain/dns/preferences` - retrieves the DNS preferences for a domain
+Retrieves the DNS preferences that are currently set for the given domain.
+Supply the domain of interest in the path.

 ##### Parameters
 No parameters. 

 ##### Example
 ```
-GET /api/v2/tailnet/example.com/dns/preferences
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/preferences' \
+GET /api/v2/domain/example.com/dns/preferences
+curl 'https://api.tailscale.com/api/v2/domain/example.com/dns/preferences' \
  -u "tskey-yourapikey123:" 
 ```

@@ -673,21 +566,19 @@ Response:
 }
 ```

-<a name=tailnet-dns-preferences-post></a>
-
-#### `POST /api/v2/tailnet/:tailnet/dns/preferences` - replaces the DNS preferences for a tailnet 
-Replaces the DNS preferences for a tailnet, specifically, the MagicDNS setting.
+#### `POST /api/v2/domain/:domain/dns/preferences` - replaces the DNS preferences for a domain 
+Replaces the DNS preferences for a domain, specifically, the MagicDNS setting.
 Note that MagicDNS is dependent on DNS servers. 

 If there is at least one DNS server, then MagicDNS can be enabled. 
 Otherwise, it returns an error.
 Note that removing all nameservers will turn off MagicDNS. 
-To reenable it, nameservers must be added back, and MagicDNS must be explicitly turned on.
+To reenable it, nameservers must be added back, and MagicDNS must be explicity turned on.

 ##### Parameters
 ###### POST Body
 The DNS preferences in JSON. Currently, MagicDNS is the only setting available.
-`magicDNS` -  Automatically registers DNS names for devices in your tailnet.
+`magicDNS` -  Automatically registers DNS names for devices in your network.
 ```
 {
  "magicDNS": true
@@ -696,8 +587,8 @@ The DNS preferences in JSON. Currently, MagicDNS is the only setting available.

 ##### Example
 ```
-POST /api/v2/tailnet/example.com/dns/preferences
-curl -X POST 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/preferences' \
+POST /api/v2/domain/example.com/dns/preferences
+curl -X POST 'https://api.tailscale.com/api/v2/domain/example.com/dns/preferences' \
  -u "tskey-yourapikey123:" \
  --data-binary '{"magicDNS": true}'
 ```
@@ -719,11 +610,9 @@ If there are DNS servers:
 }
 ```

-<a name=tailnet-dns-searchpaths-get></a>
-
-#### `GET /api/v2/tailnet/:tailnet/dns/searchpaths` - retrieves the search paths for a tailnet 
-Retrieves the list of search paths that is currently set for the given tailnet. 
-Supply the tailnet of interest in the path.
+#### `GET /api/v2/domain/:domain/dns/searchpaths` - retrieves the search paths for a domain 
+Retrieves the list of search paths that is currently set for the given domain. 
+Supply the domain of interest in the path.


 ##### Parameters
@@ -731,8 +620,8 @@ No parameters.

 ##### Example
 ```
-GET /api/v2/tailnet/example.com/dns/searchpaths
-curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/searchpaths' \
+GET /api/v2/domain/example.com/dns/searchpaths
+curl 'https://api.tailscale.com/api/v2/domain/example.com/dns/searchpaths' \
  -u "tskey-yourapikey123:" 
 ```

@@ -743,15 +632,13 @@ Response:
 }
 ```

-<a name=tailnet-dns-searchpaths-post></a>
-
-#### `POST /api/v2/tailnet/:tailnet/dns/searchpaths` - replaces the search paths for a tailnet 
-Replaces the list of searchpaths with the list supplied by the user and returns an error otherwise.
+#### `POST /api/v2/domain/:domain/dns/searchpaths` - replaces the search paths for a domain 
+Replaces the list of search paths with the list supplied by the user and returns an error otherwise.

 ##### Parameters

 ###### POST Body
-`searchPaths` - A list of searchpaths in JSON.
+`searchPaths` - A list of searchpaths in JSON format.
 ```
 {
  "searchPaths: ["user1.example.com", "user2.example.com"]
@@ -760,8 +647,8 @@ Replaces the list of searchpaths with the list supplied by the user and returns

 ##### Example
 ```
-POST /api/v2/tailnet/example.com/dns/searchpaths
-curl -X POST 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/searchpaths' \
+POST /api/v2/domain/example.com/dns/searchpaths
+curl -X POST 'https://api.tailscale.com/api/v2/domain/example.com/dns/searchpaths' \
  -u "tskey-yourapikey123:" \
  --data-binary '{"searchPaths": ["user1.example.com", "user2.example.com"]}'
 ```
--- a/cmd/cloner/cloner.go
+++ b/cmd/cloner/cloner.go
@@ -140,7 +140,7 @@ func main() {
 		flag.Usage()
 		os.Exit(2)
 	}
-	if err := ioutil.WriteFile(output, out, 0644); err != nil {
+	if err := ioutil.WriteFile(output, out, 0666); err != nil {
 		log.Fatal(err)
 	}
 }
--- a/cmd/derper/derper.go
+++ b/cmd/derper/derper.go
@@ -97,7 +97,7 @@ func writeNewConfig() config {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if err := atomicfile.WriteFile(*configPath, b, 0600); err != nil {
+	if err := atomicfile.WriteFile(*configPath, b, 0666); err != nil {
 		log.Fatal(err)
 	}
 	return cfg
--- a/cmd/tailscale/cli/status.go
+++ b/cmd/tailscale/cli/status.go
@@ -14,8 +14,6 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"sort"
-	"strings"
 	"time"

 	"github.com/peterbourgon/ff/v2/ffcli"
@@ -23,7 +21,6 @@ import (
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/net/interfaces"
-	"tailscale.com/util/dnsname"
 )

 var statusCmd = &ffcli.Command{
@@ -37,7 +34,6 @@ var statusCmd = &ffcli.Command{
 		fs.BoolVar(&statusArgs.web, "web", false, "run webserver with HTML showing status")
 		fs.BoolVar(&statusArgs.active, "active", false, "filter output to only peers with active sessions (not applicable to web mode)")
 		fs.BoolVar(&statusArgs.self, "self", true, "show status of local machine")
-		fs.BoolVar(&statusArgs.peers, "peers", true, "show status of peers")
 		fs.StringVar(&statusArgs.listen, "listen", "127.0.0.1:8384", "listen address; use port 0 for automatic")
 		fs.BoolVar(&statusArgs.browser, "browser", true, "Open a browser in web mode")
 		return fs
@@ -51,7 +47,6 @@ var statusArgs struct {
 	browser bool   // in web mode, whether to open browser
 	active  bool   // in CLI mode, filter output to only peers with active sessions
 	self    bool   // in CLI mode, show status of local machine
-	peers   bool   // in CLI mode, show status of peer machines
 }

 func runStatus(ctx context.Context, args []string) error {
@@ -141,30 +136,30 @@ func runStatus(ctx context.Context, args []string) error {
 	f := func(format string, a ...interface{}) { fmt.Fprintf(&buf, format, a...) }
 	printPS := func(ps *ipnstate.PeerStatus) {
 		active := peerActive(ps)
-		f("%-15s %-20s %-12s %-7s ",
-			ps.TailAddr,
-			dnsOrQuoteHostname(st, ps),
-			ownerLogin(st, ps),
+		f("%s %-7s %-15s %-18s tx=%8d rx=%8d ",
+			ps.PublicKey.ShortString(),
 			ps.OS,
+			ps.TailAddr,
+			ps.SimpleHostName(),
+			ps.TxBytes,
+			ps.RxBytes,
 		)
 		relay := ps.Relay
-		anyTraffic := ps.TxBytes != 0 || ps.RxBytes != 0
-		if !active {
-			if anyTraffic {
-				f("idle")
-			} else {
-				f("-")
-			}
+		if active && relay != "" && ps.CurAddr == "" {
+			relay = "*" + relay + "*"
 		} else {
-			f("active; ")
-			if relay != "" && ps.CurAddr == "" {
-				f("relay %q", relay)
-			} else if ps.CurAddr != "" {
-				f("direct %s", ps.CurAddr)
-			}
+			relay = " " + relay
 		}
-		if anyTraffic {
-			f(", tx %d rx %d", ps.TxBytes, ps.RxBytes)
+		f("%-6s", relay)
+		for i, addr := range ps.Addrs {
+			if i != 0 {
+				f(", ")
+			}
+			if addr == ps.CurAddr {
+				f("*%s*", addr)
+			} else {
+				f("%s", addr)
+			}
 		}
 		f("\n")
 	}
@@ -172,23 +167,16 @@ func runStatus(ctx context.Context, args []string) error {
 	if statusArgs.self && st.Self != nil {
 		printPS(st.Self)
 	}
-	if statusArgs.peers {
-		var peers []*ipnstate.PeerStatus
-		for _, peer := range st.Peers() {
-			ps := st.Peer[peer]
-			if ps.ShareeNode {
-				continue
-			}
-			peers = append(peers, ps)
+	for _, peer := range st.Peers() {
+		ps := st.Peer[peer]
+		if ps.ShareeNode {
+			continue
 		}
-		sort.Slice(peers, func(i, j int) bool { return sortKey(peers[i]) < sortKey(peers[j]) })
-		for _, ps := range peers {
-			active := peerActive(ps)
-			if statusArgs.active && !active {
-				continue
-			}
-			printPS(ps)
+		active := peerActive(ps)
+		if statusArgs.active && !active {
+			continue
 		}
+		printPS(ps)
 	}
 	os.Stdout.Write(buf.Bytes())
 	return nil
@@ -200,37 +188,3 @@ func runStatus(ctx context.Context, args []string) error {
 func peerActive(ps *ipnstate.PeerStatus) bool {
 	return !ps.LastWrite.IsZero() && time.Since(ps.LastWrite) < 2*time.Minute
 }
-
-func dnsOrQuoteHostname(st *ipnstate.Status, ps *ipnstate.PeerStatus) string {
-	if i := strings.Index(ps.DNSName, "."); i != -1 && dnsname.HasSuffix(ps.DNSName, st.MagicDNSSuffix) {
-		return ps.DNSName[:i]
-	}
-	if ps.DNSName != "" {
-		return strings.TrimRight(ps.DNSName, ".")
-	}
-	return fmt.Sprintf("(%q)", strings.ReplaceAll(ps.SimpleHostName(), " ", "_"))
-}
-
-func sortKey(ps *ipnstate.PeerStatus) string {
-	if ps.DNSName != "" {
-		return ps.DNSName
-	}
-	if ps.HostName != "" {
-		return ps.HostName
-	}
-	return ps.TailAddr
-}
-
-func ownerLogin(st *ipnstate.Status, ps *ipnstate.PeerStatus) string {
-	if ps.UserID.IsZero() {
-		return "-"
-	}
-	u, ok := st.User[ps.UserID]
-	if !ok {
-		return fmt.Sprint(ps.UserID)
-	}
-	if i := strings.Index(u.LoginName, "@"); i != -1 {
-		return u.LoginName[:i+1]
-	}
-	return u.LoginName
-}
--- a/cmd/tailscale/depaware.txt
+++ b/cmd/tailscale/depaware.txt
@@ -9,6 +9,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
   W 💣 github.com/go-ole/go-ole                                     from github.com/go-ole/go-ole/oleutil+
   W 💣 github.com/go-ole/go-ole/oleutil                             from tailscale.com/wgengine/winnet
   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/wgengine/router/dns
+        github.com/golang/groupcache/lru                             from tailscale.com/wgengine/filter+
   L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/wgengine/monitor
   L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
   L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
@@ -24,10 +25,10 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
        github.com/tailscale/wireguard-go/ratelimiter                from github.com/tailscale/wireguard-go/device
        github.com/tailscale/wireguard-go/replay                     from github.com/tailscale/wireguard-go/device
        github.com/tailscale/wireguard-go/rwcancel                   from github.com/tailscale/wireguard-go/device+
-        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device+
+        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device
     💣 github.com/tailscale/wireguard-go/tun                        from github.com/tailscale/wireguard-go/device+
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun+
-        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/device+
+   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun
+        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/conn+
        github.com/tcnksm/go-httpstat                                from tailscale.com/net/netcheck
        github.com/toqueteos/webbrowser                              from tailscale.com/cmd/tailscale/cli
     💣 go4.org/intern                                               from inet.af/netaddr
@@ -51,7 +52,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
        tailscale.com/logtail/backoff                                from tailscale.com/control/controlclient+
        tailscale.com/metrics                                        from tailscale.com/derp
        tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
-        tailscale.com/net/flowtrack                                  from tailscale.com/wgengine/filter+
     💣 tailscale.com/net/interfaces                                 from tailscale.com/cmd/tailscale/cli+
        tailscale.com/net/netcheck                                   from tailscale.com/cmd/tailscale/cli+
        tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
@@ -74,7 +74,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
        tailscale.com/types/strbuilder                               from tailscale.com/net/packet
        tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
        tailscale.com/types/wgkey                                    from tailscale.com/control/controlclient+
-        tailscale.com/util/dnsname                                   from tailscale.com/cmd/tailscale/cli+
  LW    tailscale.com/util/endian                                    from tailscale.com/net/netns+
        tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
        tailscale.com/util/systemd                                   from tailscale.com/control/controlclient+
@@ -90,7 +89,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
        tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine
   W 💣 tailscale.com/wgengine/winnet                                from tailscale.com/wgengine/router
        golang.org/x/crypto/blake2b                                  from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device+
+        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device
        golang.org/x/crypto/chacha20                                 from golang.org/x/crypto/chacha20poly1305
        golang.org/x/crypto/chacha20poly1305                         from crypto/tls+
        golang.org/x/crypto/cryptobyte                               from crypto/ecdsa+
--- a/cmd/tailscaled/depaware.txt
+++ b/cmd/tailscaled/depaware.txt
@@ -9,7 +9,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
   W 💣 github.com/go-ole/go-ole                                     from github.com/go-ole/go-ole/oleutil+
   W 💣 github.com/go-ole/go-ole/oleutil                             from tailscale.com/wgengine/winnet
   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/wgengine/router/dns
-        github.com/google/btree                                      from gvisor.dev/gvisor/pkg/tcpip/header+
+        github.com/golang/groupcache/lru                             from tailscale.com/wgengine/filter+
   L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/wgengine/monitor
   L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
        github.com/klauspost/compress/fse                            from github.com/klauspost/compress/huff0
@@ -28,44 +28,15 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
        github.com/tailscale/wireguard-go/ratelimiter                from github.com/tailscale/wireguard-go/device
        github.com/tailscale/wireguard-go/replay                     from github.com/tailscale/wireguard-go/device
        github.com/tailscale/wireguard-go/rwcancel                   from github.com/tailscale/wireguard-go/device+
-        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device+
+        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device
     💣 github.com/tailscale/wireguard-go/tun                        from github.com/tailscale/wireguard-go/device+
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun+
-        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/device+
+   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun
+        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/conn+
        github.com/tcnksm/go-httpstat                                from tailscale.com/net/netcheck
     💣 go4.org/intern                                               from inet.af/netaddr
     💣 go4.org/mem                                                  from tailscale.com/control/controlclient+
        go4.org/unsafe/assume-no-moving-gc                           from go4.org/intern
   W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/interfaces+
-     💣 gvisor.dev/gvisor/pkg/gohacks                                from gvisor.dev/gvisor/pkg/state/wire
-        gvisor.dev/gvisor/pkg/linewriter                             from gvisor.dev/gvisor/pkg/log
-        gvisor.dev/gvisor/pkg/log                                    from gvisor.dev/gvisor/pkg/tcpip/stack+
-        gvisor.dev/gvisor/pkg/rand                                   from gvisor.dev/gvisor/pkg/tcpip/network/hash+
-     💣 gvisor.dev/gvisor/pkg/sleep                                  from gvisor.dev/gvisor/pkg/tcpip/transport/tcp
-     💣 gvisor.dev/gvisor/pkg/state                                  from gvisor.dev/gvisor/pkg/tcpip+
-        gvisor.dev/gvisor/pkg/state/wire                             from gvisor.dev/gvisor/pkg/state
-     💣 gvisor.dev/gvisor/pkg/sync                                   from gvisor.dev/gvisor/pkg/linewriter+
-     💣 gvisor.dev/gvisor/pkg/tcpip                                  from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/tcpip/adapters/gonet                   from tailscale.com/wgengine/netstack
-        gvisor.dev/gvisor/pkg/tcpip/buffer                           from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/tcpip/hash/jenkins                     from gvisor.dev/gvisor/pkg/tcpip/stack+
-        gvisor.dev/gvisor/pkg/tcpip/header                           from gvisor.dev/gvisor/pkg/tcpip/link/channel+
-        gvisor.dev/gvisor/pkg/tcpip/header/parse                     from gvisor.dev/gvisor/pkg/tcpip/network/ipv4+
-        gvisor.dev/gvisor/pkg/tcpip/link/channel                     from tailscale.com/wgengine/netstack
-        gvisor.dev/gvisor/pkg/tcpip/network/fragmentation            from gvisor.dev/gvisor/pkg/tcpip/network/ipv4
-        gvisor.dev/gvisor/pkg/tcpip/network/hash                     from gvisor.dev/gvisor/pkg/tcpip/network/ipv4
-        gvisor.dev/gvisor/pkg/tcpip/network/ip                       from gvisor.dev/gvisor/pkg/tcpip/network/ipv4
-        gvisor.dev/gvisor/pkg/tcpip/network/ipv4                     from tailscale.com/wgengine/netstack
-        gvisor.dev/gvisor/pkg/tcpip/ports                            from gvisor.dev/gvisor/pkg/tcpip/stack+
-        gvisor.dev/gvisor/pkg/tcpip/seqnum                           from gvisor.dev/gvisor/pkg/tcpip/header+
-        gvisor.dev/gvisor/pkg/tcpip/stack                            from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/tcpip/transport/icmp                   from tailscale.com/wgengine/netstack
-        gvisor.dev/gvisor/pkg/tcpip/transport/packet                 from gvisor.dev/gvisor/pkg/tcpip/transport/raw
-        gvisor.dev/gvisor/pkg/tcpip/transport/raw                    from gvisor.dev/gvisor/pkg/tcpip/transport/icmp+
-     💣 gvisor.dev/gvisor/pkg/tcpip/transport/tcp                    from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/tcpip/transport/tcpconntrack           from gvisor.dev/gvisor/pkg/tcpip/stack
-        gvisor.dev/gvisor/pkg/tcpip/transport/udp                    from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/waiter                                 from gvisor.dev/gvisor/pkg/tcpip+
        inet.af/netaddr                                              from tailscale.com/control/controlclient+
        rsc.io/goversion/version                                     from tailscale.com/version
        tailscale.com/atomicfile                                     from tailscale.com/ipn+
@@ -86,7 +57,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
        tailscale.com/logtail/filch                                  from tailscale.com/logpolicy
        tailscale.com/metrics                                        from tailscale.com/derp
        tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
-        tailscale.com/net/flowtrack                                  from tailscale.com/wgengine/filter+
     💣 tailscale.com/net/interfaces                                 from tailscale.com/ipn+
        tailscale.com/net/netcheck                                   from tailscale.com/wgengine/magicsock
        tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
@@ -112,7 +82,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
        tailscale.com/types/strbuilder                               from tailscale.com/net/packet
        tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
        tailscale.com/types/wgkey                                    from tailscale.com/control/controlclient+
-        tailscale.com/util/dnsname                                   from tailscale.com/control/controlclient+
  LW    tailscale.com/util/endian                                    from tailscale.com/net/netns+
        tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
        tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
@@ -124,14 +93,13 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
        tailscale.com/wgengine/filter                                from tailscale.com/control/controlclient+
        tailscale.com/wgengine/magicsock                             from tailscale.com/cmd/tailscaled+
     💣 tailscale.com/wgengine/monitor                               from tailscale.com/wgengine
-        tailscale.com/wgengine/netstack                              from tailscale.com/cmd/tailscaled
        tailscale.com/wgengine/router                                from tailscale.com/cmd/tailscaled+
        tailscale.com/wgengine/router/dns                            from tailscale.com/ipn+
        tailscale.com/wgengine/tsdns                                 from tailscale.com/ipn+
-        tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine+
+        tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine
   W 💣 tailscale.com/wgengine/winnet                                from tailscale.com/wgengine/router
        golang.org/x/crypto/blake2b                                  from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device+
+        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device
        golang.org/x/crypto/chacha20                                 from golang.org/x/crypto/chacha20poly1305
        golang.org/x/crypto/chacha20poly1305                         from crypto/tls+
        golang.org/x/crypto/cryptobyte                               from crypto/ecdsa+
@@ -172,7 +140,6 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
        compress/flate                                               from compress/gzip+
        compress/gzip                                                from internal/profile+
        compress/zlib                                                from debug/elf+
-        container/heap                                               from gvisor.dev/gvisor/pkg/tcpip/transport/tcp
        container/list                                               from crypto/tls+
        context                                                      from crypto/tls+
        crypto                                                       from crypto/ecdsa+
--- a/cmd/tailscaled/tailscaled.go
+++ b/cmd/tailscaled/tailscaled.go
@@ -33,7 +33,6 @@ import (
 	"tailscale.com/version"
 	"tailscale.com/wgengine"
 	"tailscale.com/wgengine/magicsock"
-	"tailscale.com/wgengine/netstack"
 	"tailscale.com/wgengine/router"
 )

@@ -148,11 +147,7 @@ func run() error {

 	var e wgengine.Engine
 	if args.fake {
-		var impl wgengine.FakeImplFunc
-		if args.tunname == "userspace-networking" {
-			impl = netstack.Impl
-		}
-		e, err = wgengine.NewFakeUserspaceEngine(logf, 0, impl)
+		e, err = wgengine.NewFakeUserspaceEngine(logf, args.port)
 	} else {
 		e, err = wgengine.NewUserspaceEngine(logf, args.tunname, args.port)
 	}
--- a/cmd/tailscaled/tailscaled.service
+++ b/cmd/tailscaled/tailscaled.service
@@ -20,15 +20,9 @@ CacheDirectory=tailscale
 CacheDirectoryMode=0750
 Type=notify

-DeviceAllow=/dev/net/tun
-DeviceAllow=/dev/null
-DeviceAllow=/dev/random
-DeviceAllow=/dev/urandom
-DevicePolicy=strict
 LockPersonality=true
 MemoryDenyWriteExecute=true
 PrivateTmp=true
-ProtectClock=true
 ProtectControlGroups=true
 ProtectHome=true
 ProtectKernelTunables=true
--- a/control/controlclient/auto.go
+++ b/control/controlclient/auto.go
@@ -117,16 +117,15 @@ type Client struct {
 	mu         sync.Mutex   // mutex guards the following fields
 	statusFunc func(Status) // called to update Client status

-	paused          bool // whether we should stop making HTTP requests
-	unpauseWaiters  []chan struct{}
-	loggedIn        bool       // true if currently logged in
-	loginGoal       *LoginGoal // non-nil if some login activity is desired
-	synced          bool       // true if our netmap is up-to-date
-	hostinfo        *tailcfg.Hostinfo
-	inPollNetMap    bool // true if currently running a PollNetMap
-	inLiteMapUpdate bool // true if a lite (non-streaming) map request is outstanding
-	inSendStatus    int  // number of sendStatus calls currently in progress
-	state           State
+	paused         bool // whether we should stop making HTTP requests
+	unpauseWaiters []chan struct{}
+	loggedIn       bool       // true if currently logged in
+	loginGoal      *LoginGoal // non-nil if some login activity is desired
+	synced         bool       // true if our netmap is up-to-date
+	hostinfo       *tailcfg.Hostinfo
+	inPollNetMap   bool // true if currently running a PollNetMap
+	inSendStatus   int  // number of sendStatus calls currently in progress
+	state          State

 	authCtx    context.Context // context used for auth requests
 	mapCtx     context.Context // context used for netmap requests
@@ -202,50 +201,6 @@ func (c *Client) Start() {
 	go c.mapRoutine()
 }

-// sendNewMapRequest either sends a new OmitPeers, non-streaming map request
-// (to just send Hostinfo/Netinfo/Endpoints info, while keeping an existing
-// streaming response open), or start a new streaming one if necessary.
-//
-// It should be called whenever there's something new to tell the server.
-func (c *Client) sendNewMapRequest() {
-	c.mu.Lock()
-
-	// If we're not already streaming a netmap, or if we're already stuck
-	// in a lite update, then tear down everything and start a new stream
-	// (which starts by sending a new map request)
-	if !c.inPollNetMap || c.inLiteMapUpdate {
-		c.mu.Unlock()
-		c.cancelMapSafely()
-		return
-	}
-
-	// Otherwise, send a lite update that doesn't keep a
-	// long-running stream response.
-	defer c.mu.Unlock()
-	c.inLiteMapUpdate = true
-	ctx, cancel := context.WithTimeout(c.mapCtx, 10*time.Second)
-	go func() {
-		defer cancel()
-		t0 := time.Now()
-		err := c.direct.SendLiteMapUpdate(ctx)
-		d := time.Since(t0).Round(time.Millisecond)
-		c.mu.Lock()
-		c.inLiteMapUpdate = false
-		c.mu.Unlock()
-		if err == nil {
-			c.logf("[v1] successful lite map update in %v", d)
-			return
-		}
-		if ctx.Err() == nil {
-			c.logf("lite map update after %v: %v", d, err)
-		}
-		// Fall back to restarting the long-polling map
-		// request (the old heavy way) if the lite update
-		// failed for any reason.
-		c.cancelMapSafely()
-	}()
-}
-
 func (c *Client) cancelAuth() {
 	c.mu.Lock()
 	if c.authCancel != nil {
@@ -590,7 +545,7 @@ func (c *Client) SetHostinfo(hi *tailcfg.Hostinfo) {
 	c.logf("Hostinfo: %v", hi)

 	// Send new Hostinfo to server
-	c.sendNewMapRequest()
+	c.cancelMapSafely()
 }

 func (c *Client) SetNetInfo(ni *tailcfg.NetInfo) {
@@ -598,12 +553,13 @@ func (c *Client) SetNetInfo(ni *tailcfg.NetInfo) {
 		panic("nil NetInfo")
 	}
 	if !c.direct.SetNetInfo(ni) {
+		c.logf("[unexpected] duplicate NetInfo: %v", ni)
 		return
 	}
 	c.logf("NetInfo: %v", ni)

 	// Send new Hostinfo (which includes NetInfo) to server
-	c.sendNewMapRequest()
+	c.cancelMapSafely()
 }

 func (c *Client) sendStatus(who string, err error, url string, nm *NetworkMap) {
@@ -680,7 +636,7 @@ func (c *Client) Logout() {
 func (c *Client) UpdateEndpoints(localPort uint16, endpoints []string) {
 	changed := c.direct.SetEndpoints(localPort, endpoints)
 	if changed {
-		c.sendNewMapRequest()
+		c.cancelMapSafely()
 	}
 }

--- a/control/controlclient/controlclient_test.go
+++ b/control/controlclient/controlclient_test.go
@@ -42,11 +42,6 @@ func TestStatusEqual(t *testing.T) {
 			&Status{},
 			false,
 		},
-		{
-			nil,
-			nil,
-			true,
-		},
 		{
 			&Status{},
 			&Status{},
--- a/control/controlclient/direct.go
+++ b/control/controlclient/direct.go
@@ -107,17 +107,16 @@ func (p *Persist) Pretty() string {

 // Direct is the client that connects to a tailcontrol server for a node.
 type Direct struct {
-	httpc                  *http.Client // HTTP client used to talk to tailcontrol
-	serverURL              string       // URL of the tailcontrol server
-	timeNow                func() time.Time
-	lastPrintMap           time.Time
-	newDecompressor        func() (Decompressor, error)
-	keepAlive              bool
-	logf                   logger.Logf
-	discoPubKey            tailcfg.DiscoKey
-	machinePrivKey         wgkey.Private
-	debugFlags             []string
-	keepSharerAndUserSplit bool
+	httpc           *http.Client // HTTP client used to talk to tailcontrol
+	serverURL       string       // URL of the tailcontrol server
+	timeNow         func() time.Time
+	lastPrintMap    time.Time
+	newDecompressor func() (Decompressor, error)
+	keepAlive       bool
+	logf            logger.Logf
+	discoPubKey     tailcfg.DiscoKey
+	machinePrivKey  wgkey.Private
+	debugFlags      []string

 	mu           sync.Mutex // mutex guards the following fields
 	serverKey    wgkey.Key
@@ -145,10 +144,6 @@ type Options struct {
 	Logf              logger.Logf
 	HTTPTestClient    *http.Client // optional HTTP client to use (for tests only)
 	DebugFlags        []string     // debug settings to send to control
-
-	// KeepSharerAndUserSplit controls whether the client
-	// understands Node.Sharer. If false, the Sharer is mapped to the User.
-	KeepSharerAndUserSplit bool
 }

 type Decompressor interface {
@@ -195,18 +190,17 @@ func NewDirect(opts Options) (*Direct, error) {
 	}

 	c := &Direct{
-		httpc:                  httpc,
-		machinePrivKey:         opts.MachinePrivateKey,
-		serverURL:              opts.ServerURL,
-		timeNow:                opts.TimeNow,
-		logf:                   opts.Logf,
-		newDecompressor:        opts.NewDecompressor,
-		keepAlive:              opts.KeepAlive,
-		persist:                opts.Persist,
-		authKey:                opts.AuthKey,
-		discoPubKey:            opts.DiscoPublicKey,
-		debugFlags:             opts.DebugFlags,
-		keepSharerAndUserSplit: opts.KeepSharerAndUserSplit,
+		httpc:           httpc,
+		machinePrivKey:  opts.MachinePrivateKey,
+		serverURL:       opts.ServerURL,
+		timeNow:         opts.TimeNow,
+		logf:            opts.Logf,
+		newDecompressor: opts.NewDecompressor,
+		keepAlive:       opts.KeepAlive,
+		persist:         opts.Persist,
+		authKey:         opts.AuthKey,
+		discoPubKey:     opts.DiscoPublicKey,
+		debugFlags:      opts.DebugFlags,
 	}
 	if opts.Hostinfo == nil {
 		c.SetHostinfo(NewHostinfo())
@@ -527,18 +521,6 @@ func inTest() bool { return flag.Lookup("test.v") != nil }
 // maxPolls is how many network maps to download; common values are 1
 // or -1 (to keep a long-poll query open to the server).
 func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkMap)) error {
-	return c.sendMapRequest(ctx, maxPolls, cb)
-}
-
-// SendLiteMapUpdate makes a /map request to update the server of our latest state,
-// but does not fetch anything. It returns an error if the server did not return a
-// successful 200 OK response.
-func (c *Direct) SendLiteMapUpdate(ctx context.Context) error {
-	return c.sendMapRequest(ctx, 1, nil)
-}
-
-// cb nil means to omit peers.
-func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*NetworkMap)) error {
 	c.mu.Lock()
 	persist := c.persist
 	serverURL := c.serverURL
@@ -565,7 +547,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 	}

 	request := tailcfg.MapRequest{
-		Version:    tailcfg.CurrentMapRequestVersion,
+		Version:    8,
 		KeepAlive:  c.keepAlive,
 		NodeKey:    tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
 		DiscoKey:   c.discoPubKey,
@@ -573,7 +555,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 		Stream:     allowStream,
 		Hostinfo:   hostinfo,
 		DebugFlags: c.debugFlags,
-		OmitPeers:  cb == nil,
 	}
 	if hostinfo != nil && ipForwardingBroken(hostinfo.RoutableIPs) {
 		old := request.DebugFlags
@@ -626,11 +607,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 	}
 	defer res.Body.Close()

-	if cb == nil {
-		io.Copy(ioutil.Discard, res.Body)
-		return nil
-	}
-
 	// If we go more than pollTimeout without hearing from the server,
 	// end the long poll. We should be receiving a keep alive ping
 	// every minute.
@@ -667,7 +643,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 	var lastDERPMap *tailcfg.DERPMap
 	var lastUserProfile = map[tailcfg.UserID]tailcfg.UserProfile{}
 	var lastParsedPacketFilter []filter.Match
-	var collectServices bool

 	// If allowStream, then the server will use an HTTP long poll to
 	// return incremental results. There is always one response right
@@ -749,36 +724,23 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 			lastParsedPacketFilter = c.parsePacketFilter(pf)
 		}

-		if v, ok := resp.CollectServices.Get(); ok {
-			collectServices = v
-		}
-
-		// Get latest localPort. This might've changed if
-		// a lite map update occured meanwhile. This only affects
-		// the end-to-end test.
-		// TODO(bradfitz): remove the NetworkMap.LocalPort field entirely.
-		c.mu.Lock()
-		localPort = c.localPort
-		c.mu.Unlock()
-
 		nm := &NetworkMap{
-			NodeKey:         tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
-			PrivateKey:      persist.PrivateNodeKey,
-			MachineKey:      machinePubKey,
-			Expiry:          resp.Node.KeyExpiry,
-			Name:            resp.Node.Name,
-			Addresses:       resp.Node.Addresses,
-			Peers:           resp.Peers,
-			LocalPort:       localPort,
-			User:            resp.Node.User,
-			UserProfiles:    make(map[tailcfg.UserID]tailcfg.UserProfile),
-			Domain:          resp.Domain,
-			DNS:             resp.DNSConfig,
-			Hostinfo:        resp.Node.Hostinfo,
-			PacketFilter:    lastParsedPacketFilter,
-			CollectServices: collectServices,
-			DERPMap:         lastDERPMap,
-			Debug:           resp.Debug,
+			NodeKey:      tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
+			PrivateKey:   persist.PrivateNodeKey,
+			MachineKey:   machinePubKey,
+			Expiry:       resp.Node.KeyExpiry,
+			Name:         resp.Node.Name,
+			Addresses:    resp.Node.Addresses,
+			Peers:        resp.Peers,
+			LocalPort:    localPort,
+			User:         resp.Node.User,
+			UserProfiles: make(map[tailcfg.UserID]tailcfg.UserProfile),
+			Domain:       resp.Domain,
+			DNS:          resp.DNSConfig,
+			Hostinfo:     resp.Node.Hostinfo,
+			PacketFilter: lastParsedPacketFilter,
+			DERPMap:      lastDERPMap,
+			Debug:        resp.Debug,
 		}
 		addUserProfile := func(userID tailcfg.UserID) {
 			if _, dup := nm.UserProfiles[userID]; dup {
@@ -791,13 +753,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*Netw
 		}
 		addUserProfile(nm.User)
 		for _, peer := range resp.Peers {
-			if !peer.Sharer.IsZero() {
-				if c.keepSharerAndUserSplit {
-					addUserProfile(peer.Sharer)
-				} else {
-					peer.User = peer.Sharer
-				}
-			}
 			addUserProfile(peer.User)
 		}
 		if resp.Node.MachineAuthorized {
--- a/control/controlclient/direct_test.go
+++ b/control/controlclient/direct_test.go
@@ -11,7 +11,6 @@ import (
 	"testing"

 	"tailscale.com/tailcfg"
-	"tailscale.com/types/wgkey"
 )

 func TestUndeltaPeers(t *testing.T) {
@@ -92,67 +91,3 @@ func formatNodes(nodes []*tailcfg.Node) string {
 	}
 	return sb.String()
 }
-
-func TestNewDirect(t *testing.T) {
-	hi := NewHostinfo()
-	ni := tailcfg.NetInfo{LinkType: "wired"}
-	hi.NetInfo = &ni
-
-	key, err := wgkey.NewPrivate()
-	if err != nil {
-		t.Error(err)
-	}
-	opts := Options{ServerURL: "https://example.com", MachinePrivateKey: key, Hostinfo: hi}
-	c, err := NewDirect(opts)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if c.serverURL != opts.ServerURL {
-		t.Errorf("c.serverURL got %v want %v", c.serverURL, opts.ServerURL)
-	}
-
-	if !hi.Equal(c.hostinfo) {
-		t.Errorf("c.hostinfo got %v want %v", c.hostinfo, hi)
-	}
-
-	changed := c.SetNetInfo(&ni)
-	if changed {
-		t.Errorf("c.SetNetInfo(ni) want false got %v", changed)
-	}
-	ni = tailcfg.NetInfo{LinkType: "wifi"}
-	changed = c.SetNetInfo(&ni)
-	if !changed {
-		t.Errorf("c.SetNetInfo(ni) want true got %v", changed)
-	}
-
-	changed = c.SetHostinfo(hi)
-	if changed {
-		t.Errorf("c.SetHostinfo(hi) want false got %v", changed)
-	}
-	hi = NewHostinfo()
-	hi.Hostname = "different host name"
-	changed = c.SetHostinfo(hi)
-	if !changed {
-		t.Errorf("c.SetHostinfo(hi) want true got %v", changed)
-	}
-
-	endpoints := []string{"1", "2", "3"}
-	changed = c.newEndpoints(12, endpoints)
-	if !changed {
-		t.Errorf("c.newEndpoints(12) want true got %v", changed)
-	}
-	changed = c.newEndpoints(12, endpoints)
-	if changed {
-		t.Errorf("c.newEndpoints(12) want false got %v", changed)
-	}
-	changed = c.newEndpoints(13, endpoints)
-	if !changed {
-		t.Errorf("c.newEndpoints(13) want true got %v", changed)
-	}
-	endpoints = []string{"4", "5", "6"}
-	changed = c.newEndpoints(13, endpoints)
-	if !changed {
-		t.Errorf("c.newEndpoints(13) want true got %v", changed)
-	}
-}
--- a/control/controlclient/netmap.go
+++ b/control/controlclient/netmap.go
@@ -18,7 +18,6 @@ import (
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/logger"
 	"tailscale.com/types/wgkey"
-	"tailscale.com/util/dnsname"
 	"tailscale.com/wgengine/filter"
 )

@@ -39,12 +38,6 @@ type NetworkMap struct {
 	Hostinfo      tailcfg.Hostinfo
 	PacketFilter  []filter.Match

-	// CollectServices reports whether this node's Tailnet has
-	// requested that info about services be included in HostInfo.
-	// If set, Hostinfo.ShieldsUp blocks services collection; that
-	// takes precedence over this field.
-	CollectServices bool
-
 	// DERPMap is the last DERP server map received. It's reused
 	// between updates and should not be modified.
 	DERPMap *tailcfg.DERPMap
@@ -63,30 +56,7 @@ type NetworkMap struct {
 	// TODO(crawshaw): Capabilities []tailcfg.Capability
 }

-// MagicDNSSuffix returns the domain's MagicDNS suffix, or empty if none.
-// If non-empty, it will neither start nor end with a period.
-func (nm *NetworkMap) MagicDNSSuffix() string {
-	searchPathUsedAsDNSSuffix := func(suffix string) bool {
-		if dnsname.HasSuffix(nm.Name, suffix) {
-			return true
-		}
-		for _, p := range nm.Peers {
-			if dnsname.HasSuffix(p.Name, suffix) {
-				return true
-			}
-		}
-		return false
-	}
-
-	for _, d := range nm.DNS.Domains {
-		if searchPathUsedAsDNSSuffix(d) {
-			return strings.Trim(d, ".")
-		}
-	}
-	return ""
-}
-
-func (nm *NetworkMap) String() string {
+func (nm NetworkMap) String() string {
 	return nm.Concise()
 }

@@ -298,7 +268,7 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
 			if err := appendEndpoint(cpeer, fmt.Sprintf("%x%s", peer.DiscoKey[:], EndpointDiscoSuffix)); err != nil {
 				return nil, err
 			}
-			cpeer.Endpoints = fmt.Sprintf("%x.disco.tailscale:12345", peer.DiscoKey[:])
+			cpeer.Endpoints = []wgcfg.Endpoint{{Host: fmt.Sprintf("%x.disco.tailscale", peer.DiscoKey[:]), Port: 12345}}
 		} else {
 			if err := appendEndpoint(cpeer, peer.DERP); err != nil {
 				return nil, err
@@ -349,18 +319,15 @@ func appendEndpoint(peer *wgcfg.Peer, epStr string) error {
 	if epStr == "" {
 		return nil
 	}
-	_, port, err := net.SplitHostPort(epStr)
+	host, port, err := net.SplitHostPort(epStr)
 	if err != nil {
 		return fmt.Errorf("malformed endpoint %q for peer %v", epStr, peer.PublicKey.ShortString())
 	}
-	_, err = strconv.ParseUint(port, 10, 16)
+	port16, err := strconv.ParseUint(port, 10, 16)
 	if err != nil {
 		return fmt.Errorf("invalid port in endpoint %q for peer %v", epStr, peer.PublicKey.ShortString())
 	}
-	if peer.Endpoints != "" {
-		peer.Endpoints += ","
-	}
-	peer.Endpoints += epStr
+	peer.Endpoints = append(peer.Endpoints, wgcfg.Endpoint{Host: host, Port: uint16(port16)})
 	return nil
 }

--- a/derp/derphttp/derphttp_client.go
+++ b/derp/derphttp/derphttp_client.go
@@ -358,7 +358,7 @@ func (c *Client) dialURL(ctx context.Context) (net.Conn, error) {
 	dialer := netns.NewDialer()

 	if c.DNSCache != nil {
-		ip, _, err := c.DNSCache.LookupIP(ctx, host)
+		ip, err := c.DNSCache.LookupIP(ctx, host)
 		if err == nil {
 			hostOrIP = ip.String()
 		}
--- a/go.mod
+++ b/go.mod
@@ -12,22 +12,24 @@ require (
 	github.com/go-multierror/multierror v1.0.2
 	github.com/go-ole/go-ole v1.2.4
 	github.com/godbus/dbus/v5 v5.0.3
-	github.com/golang/protobuf v1.4.2 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
 	github.com/google/go-cmp v0.5.4
 	github.com/goreleaser/nfpm v1.1.10
 	github.com/jsimonetti/rtnetlink v0.0.0-20201216134343-bde56ed16391
 	github.com/klauspost/compress v1.10.10
-	github.com/kr/pty v1.1.4-0.20190131011033-7dc38fb350b1
+	github.com/kr/pty v1.1.1
 	github.com/mdlayher/netlink v1.2.0
 	github.com/mdlayher/sdnotify v0.0.0-20200625151349-e4a4f32afc4a
 	github.com/miekg/dns v1.1.30
 	github.com/pborman/getopt v0.0.0-20190409184431-ee0cd42419d3
 	github.com/peterbourgon/ff/v2 v2.0.0
 	github.com/tailscale/depaware v0.0.0-20201214215404-77d1e9757027
-	github.com/tailscale/wireguard-go v0.0.0-20210116013233-4cd297ed5a7d
+	github.com/tailscale/wireguard-go v0.0.0-20201228234719-da0d2727455d
 	github.com/tcnksm/go-httpstat v0.2.0
 	github.com/toqueteos/webbrowser v1.2.0
+	go4.org/intern v0.0.0-20201223061701-969c7e87e7cb // indirect
 	go4.org/mem v0.0.0-20201119185036-c04c5a6ff174
+	go4.org/unsafe/assume-no-moving-gc v0.0.0-20201222180813-1025295fd063 // indirect
 	golang.org/x/crypto v0.0.0-20201124201722-c8d3bf9c5392
 	golang.org/x/net v0.0.0-20201216054612-986b41b23924
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
@@ -37,8 +39,7 @@ require (
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
 	golang.org/x/tools v0.0.0-20201211185031-d93e913c1a58
 	golang.zx2c4.com/wireguard/windows v0.1.2-0.20201113162609-9b85be97fdf8
-	gvisor.dev/gvisor v0.0.0-20210111185822-3ff3110fcdd6
 	honnef.co/go/tools v0.1.0
-	inet.af/netaddr v0.0.0-20210105212526-648fbc18a69d
+	inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016
 	rsc.io/goversion v1.2.0
 )
--- a/go.sum
+++ b/go.sum
@@ -1,34 +1,8 @@
-bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.52.1-0.20200122224058-0482b626c726/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
-github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Masterminds/semver/v3 v3.0.3 h1:znjIyLfpXEDQjOIEWh+ehwpTU14UzUPub3c3sm36u14=
 github.com/Masterminds/semver/v3 v3.0.3/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
-github.com/Microsoft/go-winio v0.4.15-0.20200908182639-5b44b70ab3ab/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
-github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/alecthomas/kingpin v2.2.6+incompatible/go.mod h1:59OFYbFVLKQKq+mqrL6Rw5bR0c3ACQaawgXx0QYndlE=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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-google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.29.0/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
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-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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-google.golang.org/protobuf v1.25.1-0.20201020201750-d3470999428b/go.mod h1:hFxJC2f0epmp1elRCiEGJTKAWbwxZ2nvqZdHl3FQXCY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
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 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
 gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
-gvisor.dev/gvisor v0.0.0-20210111185822-3ff3110fcdd6 h1:H5EvGkFG+pgAAbZMV8Me3Gy+HUYdaDcGXKWWixZ0EE8=
-gvisor.dev/gvisor v0.0.0-20210111185822-3ff3110fcdd6/go.mod h1:5DEMKRjYDiM24fvDUWPjBpABm9ROMcv/kEcox3fHtm0=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.1.0 h1:AWNL1W1i7f0wNZ8VwOKNJ0sliKvOF/adn0EHenfUh+c=
 honnef.co/go/tools v0.1.0/go.mod h1:XtegFAyX/PfluP4921rXU5IkjkqBCDnUq4W8VCIoKvM=
+inet.af/netaddr v0.0.0-20200810144936-56928fe48a98/go.mod h1:qqYzz/2whtrbWJvt+DNWQyvekNN4ePQZcg2xc2/Yjww=
+inet.af/netaddr v0.0.0-20201218162718-658fec415e52/go.mod h1:qqYzz/2whtrbWJvt+DNWQyvekNN4ePQZcg2xc2/Yjww=
+inet.af/netaddr v0.0.0-20201223185330-97d366981fac h1:aqMW8vft7VmOIhtQhsTWhAuZzOBGYBv+Otyvwj+VGSU=
+inet.af/netaddr v0.0.0-20201223185330-97d366981fac/go.mod h1:9NdhtHLglxJliAZB6aC5ws3mfnUArdAzHG/iJq7cB/o=
+inet.af/netaddr v0.0.0-20201224214825-a55841caa437 h1:Li2QBwaT/hU3wE7GdyoqaX+TzIlI+V1zs/CuWrjX8e4=
+inet.af/netaddr v0.0.0-20201224214825-a55841caa437/go.mod h1:9NdhtHLglxJliAZB6aC5ws3mfnUArdAzHG/iJq7cB/o=
+inet.af/netaddr v0.0.0-20201226233944-2d1876c01610 h1:9Nnw3NS9SL4SlFtBWSdv7onMbdY+B8nflRNZvhgxuMY=
+inet.af/netaddr v0.0.0-20201226233944-2d1876c01610/go.mod h1:9NdhtHLglxJliAZB6aC5ws3mfnUArdAzHG/iJq7cB/o=
 inet.af/netaddr v0.0.0-20201228234250-33d0a924ebbf h1:0eHZ8v6j5wIiOVyoYPd70ueZ/RPEQtRlzi60uneDbRU=
 inet.af/netaddr v0.0.0-20201228234250-33d0a924ebbf/go.mod h1:9NdhtHLglxJliAZB6aC5ws3mfnUArdAzHG/iJq7cB/o=
-inet.af/netaddr v0.0.0-20210105212526-648fbc18a69d h1:6f0242aW/6x2enQBOSKgDS8KQNw6Tp7IVR8eG3x0Jc8=
-inet.af/netaddr v0.0.0-20210105212526-648fbc18a69d/go.mod h1:jPZo7Jy4nke2cCgISa4fKJKa5T7+EO8k5fWwWghzneg=
-k8s.io/api v0.16.13/go.mod h1:QWu8UWSTiuQZMMeYjwLs6ILu5O74qKSJ0c+4vrchDxs=
-k8s.io/apimachinery v0.16.13/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
-k8s.io/apimachinery v0.16.14-rc.0/go.mod h1:4HMHS3mDHtVttspuuhrJ1GGr/0S9B6iWYWZ57KnnZqQ=
-k8s.io/client-go v0.16.13/go.mod h1:UKvVT4cajC2iN7DCjLgT0KVY/cbY6DGdUCyRiIfws5M=
-k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
-k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
-k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
-k8s.io/kube-openapi v0.0.0-20200410163147-594e756bea31/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E=
-k8s.io/utils v0.0.0-20190801114015-581e00157fb1/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016 h1:CEeeAJW60aRKE6gGJC5krs2xC/uM2l8SasvgeDXFN5Q=
+inet.af/netaddr v0.0.0-20201231012616-c5dc91d2a016/go.mod h1:lbePDLSB5c45kkUmF7ETNE5X9z/yuQvWJIv1hhb5rFI=
 rsc.io/goversion v1.2.0 h1:SPn+NLTiAG7w30IRK/DKp1BjvpWabYgxlLp/+kx5J8w=
 rsc.io/goversion v1.2.0/go.mod h1:Eih9y/uIBS3ulggl7KNJ09xGSLcuNaLgmvvqa07sgfo=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+tailscale.com v1.2.10/go.mod h1:JEJiCce3MHtPCTdX2ahLc4tcnxZ7b5etish1Yt0B6+w=
--- a/internal/deepprint/deepprint_test.go
+++ b/internal/deepprint/deepprint_test.go
@@ -41,7 +41,12 @@ func getVal() []interface{} {
 			ListenPort: 5,
 			Peers: []wgcfg.Peer{
 				{
-					Endpoints: "foo:5",
+					Endpoints: []wgcfg.Endpoint{
+						{
+							Host: "foo",
+							Port: 5,
+						},
+					},
 				},
 			},
 		},
--- a/ipn/ipnserver/conn_linux.go
+++ b/ipn/ipnserver/conn_linux.go
@@ -1,49 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build linux
-
-package ipnserver
-
-import (
-	"net"
-
-	"golang.org/x/sys/unix"
-	"tailscale.com/types/logger"
-)
-
-func isReadonlyConn(c net.Conn, logf logger.Logf) (ro bool) {
-	ro = true // conservative default for naked returns below
-	uc, ok := c.(*net.UnixConn)
-	if !ok {
-		logf("unexpected connection type %T", c)
-		return
-	}
-	raw, err := uc.SyscallConn()
-	if err != nil {
-		logf("SyscallConn: %v", err)
-		return
-	}
-
-	var cred *unix.Ucred
-	cerr := raw.Control(func(fd uintptr) {
-		cred, err = unix.GetsockoptUcred(int(fd),
-			unix.SOL_SOCKET,
-			unix.SO_PEERCRED)
-	})
-	if cerr != nil {
-		logf("raw.Control: %v", err)
-		return
-	}
-	if err != nil {
-		logf("raw.Control: %v", err)
-		return
-	}
-	if cred.Uid == 0 {
-		// root is not read-only.
-		return false
-	}
-	logf("non-root connection from %v (read-only)", cred.Uid)
-	return true
-}
--- a/ipn/ipnserver/conn_no_ucred.go
+++ b/ipn/ipnserver/conn_no_ucred.go
@@ -1,27 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build !linux
-
-package ipnserver
-
-import (
-	"net"
-
-	"tailscale.com/types/logger"
-)
-
-func isReadonlyConn(c net.Conn, logf logger.Logf) bool {
-	// Windows doesn't need/use this mechanism, at least yet. It
-	// has a different last-user-wins auth model.
-
-	// And on Darwin, we're not using it yet, as the Darwin
-	// tailscaled port isn't yet done, and unix.Ucred and
-	// unix.GetsockoptUcred aren't in x/sys/unix.
-
-	// TODO(bradfitz): OpenBSD and FreeBSD should implement this too.
-	// But their x/sys/unix package is different than Linux, so
-	// I didn't include it for now.
-	return false
-}
--- a/ipn/ipnserver/server.go
+++ b/ipn/ipnserver/server.go
@@ -268,10 +268,6 @@ func (s *server) serveConn(ctx context.Context, c net.Conn, logf logger.Logf) {
 	defer s.removeAndCloseConn(c)
 	logf("[v1] incoming control connection")

-	if isReadonlyConn(c, logf) {
-		ctx = ipn.ReadonlyContextOf(ctx)
-	}
-
 	for ctx.Err() == nil {
 		msg, err := ipn.ReadMsg(br)
 		if err != nil {
@@ -283,7 +279,7 @@ func (s *server) serveConn(ctx context.Context, c net.Conn, logf logger.Logf) {
 			return
 		}
 		s.bsMu.Lock()
-		if err := s.bs.GotCommandMsg(ctx, msg); err != nil {
+		if err := s.bs.GotCommandMsg(msg); err != nil {
 			logf("GotCommandMsg: %v", err)
 		}
 		gotQuit := s.bs.GotQuit
@@ -359,7 +355,7 @@ func (s *server) addConn(c net.Conn, isHTTP bool) (ci connIdentity, err error) {
 		if doReset {
 			s.logf("identity changed; resetting server")
 			s.bsMu.Lock()
-			s.bs.Reset(context.TODO())
+			s.bs.Reset()
 			s.bsMu.Unlock()
 		}
 	}()
@@ -411,7 +407,7 @@ func (s *server) removeAndCloseConn(c net.Conn) {
 		} else {
 			s.logf("client disconnected; stopping server")
 			s.bsMu.Lock()
-			s.bs.Reset(context.TODO())
+			s.bs.Reset()
 			s.bsMu.Unlock()
 		}
 	}
@@ -585,7 +581,7 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 	server.bs = ipn.NewBackendServer(logf, b, server.writeToClients)

 	if opts.AutostartStateKey != "" {
-		server.bs.GotCommand(context.TODO(), &ipn.Command{
+		server.bs.GotCommand(&ipn.Command{
 			Version: version.Long,
 			Start: &ipn.StartArgs{
 				Opts: ipn.Options{
--- a/ipn/ipnserver/server_test.go
+++ b/ipn/ipnserver/server_test.go
@@ -56,7 +56,7 @@ func TestRunMultipleAccepts(t *testing.T) {
 		}
 	}

-	eng, err := wgengine.NewFakeUserspaceEngine(logf, 0, nil)
+	eng, err := wgengine.NewFakeUserspaceEngine(logf, 0)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/ipn/ipnstate/ipnstate.go
+++ b/ipn/ipnstate/ipnstate.go
@@ -25,10 +25,9 @@ import (

 // Status represents the entire state of the IPN network.
 type Status struct {
-	BackendState   string
-	TailscaleIPs   []netaddr.IP // Tailscale IP(s) assigned to this node
-	Self           *PeerStatus
-	MagicDNSSuffix string // e.g. "userfoo.tailscale.net" (no surrounding dots)
+	BackendState string
+	TailscaleIPs []netaddr.IP // Tailscale IP(s) assigned to this node
+	Self         *PeerStatus

 	Peer map[key.Public]*PeerStatus
 	User map[tailcfg.UserID]tailcfg.UserProfile
@@ -104,12 +103,6 @@ func (sb *StatusBuilder) SetBackendState(v string) {
 	sb.st.BackendState = v
 }

-func (sb *StatusBuilder) SetMagicDNSSuffix(v string) {
-	sb.mu.Lock()
-	defer sb.mu.Unlock()
-	sb.st.MagicDNSSuffix = v
-}
-
 func (sb *StatusBuilder) Status() *Status {
 	sb.mu.Lock()
 	defer sb.mu.Unlock()
--- a/ipn/local.go
+++ b/ipn/local.go
@@ -201,7 +201,6 @@ func (b *LocalBackend) UpdateStatus(sb *ipnstate.StatusBuilder) {
 	// TODO: hostinfo, and its networkinfo
 	// TODO: EngineStatus copy (and deprecate it?)
 	if b.netMap != nil {
-		sb.SetMagicDNSSuffix(b.netMap.MagicDNSSuffix())
 		for id, up := range b.netMap.UserProfiles {
 			sb.AddUser(id, up)
 		}
@@ -352,7 +351,7 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
 // This updates the endpoints both in the backend and in the control client.
 func (b *LocalBackend) setWgengineStatus(s *wgengine.Status, err error) {
 	if err != nil {
-		b.logf("wgengine status error: %v", err)
+		b.logf("wgengine status error: %#v", err)
 		return
 	}
 	if s == nil {
@@ -564,7 +563,8 @@ func (b *LocalBackend) updateFilter(netMap *controlclient.NetworkMap, prefs *Pre

 	if shieldsUp {
 		b.logf("netmap packet filter: (shields up)")
-		b.e.SetFilter(filter.NewShieldsUpFilter(b.logf))
+		var prevFilter *filter.Filter // don't reuse old filter state
+		b.e.SetFilter(filter.New(nil, localNets, prevFilter, b.logf))
 	} else {
 		b.logf("netmap packet filter: %v", packetFilter)
 		b.e.SetFilter(filter.New(packetFilter, localNets, b.e.GetFilter(), b.logf))
@@ -639,7 +639,7 @@ func (b *LocalBackend) updateDNSMap(netMap *controlclient.NetworkMap) {
 	}
 	set(netMap.Name, netMap.Addresses)

-	dnsMap := tsdns.NewMap(nameToIP, magicDNSRootDomains(netMap))
+	dnsMap := tsdns.NewMap(nameToIP, domainsForProxying(netMap))
 	// map diff will be logged in tsdns.Resolver.SetMap.
 	b.e.SetDNSMap(dnsMap)
 }
@@ -1014,18 +1014,16 @@ func (b *LocalBackend) parseWgStatusLocked(s *wgengine.Status) (ret EngineStatus
 	return ret
 }

-// shouldUploadServices reports whether this node should include services
-// in Hostinfo. When the user preferences currently request "shields up"
-// mode, all inbound connections are refused, so services are not reported.
-// Otherwise, shouldUploadServices respects NetMap.CollectServices.
-func (b *LocalBackend) shouldUploadServices() bool {
+// shieldsAreUp returns whether user preferences currently request
+// "shields up" mode, which disallows all inbound connections.
+func (b *LocalBackend) shieldsAreUp() bool {
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	if b.prefs == nil || b.netMap == nil {
-		return false // default to safest setting
+	if b.prefs == nil {
+		return true // default to safest setting
 	}
-	return !b.prefs.ShieldsUp && b.netMap.CollectServices
+	return b.prefs.ShieldsUp
 }

 func (b *LocalBackend) SetCurrentUserID(uid string) {
@@ -1125,7 +1123,9 @@ func (b *LocalBackend) SetPrefs(newp *Prefs) {
 // painstakingly constructing it in twelvety other places.
 func (b *LocalBackend) doSetHostinfoFilterServices(hi *tailcfg.Hostinfo) {
 	hi2 := *hi
-	if !b.shouldUploadServices() {
+	if b.shieldsAreUp() {
+		// No local services are available, since ShieldsUp will block
+		// them all.
 		hi2.Services = []tailcfg.Service{}
 	}

@@ -1209,14 +1209,20 @@ func (b *LocalBackend) authReconfig() {

 	// If CorpDNS is false, rcfg.DNS remains the zero value.
 	if uc.CorpDNS {
+		domains := nm.DNS.Domains
 		proxied := nm.DNS.Proxied
-		if proxied && len(nm.DNS.Nameservers) == 0 {
-			b.logf("[unexpected] dns proxied but no nameservers")
-			proxied = false
+		if proxied {
+			if len(nm.DNS.Nameservers) == 0 {
+				b.logf("[unexpected] dns proxied but no nameservers")
+				proxied = false
+			} else {
+				// Domains for proxying should come first to avoid leaking queries.
+				domains = append(domainsForProxying(nm), domains...)
+			}
 		}
 		rcfg.DNS = dns.Config{
 			Nameservers: nm.DNS.Nameservers,
-			Domains:     nm.DNS.Domains,
+			Domains:     domains,
 			PerDomain:   nm.DNS.PerDomain,
 			Proxied:     proxied,
 		}
@@ -1229,13 +1235,32 @@ func (b *LocalBackend) authReconfig() {
 	b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", uc.RouteAll, uc.CorpDNS, flags, err)
 }

-// magicDNSRootDomains returns the subset of nm.DNS.Domains that are the search domains for MagicDNS.
-// Each entry has a trailing period.
-func magicDNSRootDomains(nm *controlclient.NetworkMap) []string {
-	if v := nm.MagicDNSSuffix(); v != "" {
-		return []string{strings.Trim(v, ".") + "."}
+// domainsForProxying produces a list of search domains for proxied DNS.
+func domainsForProxying(nm *controlclient.NetworkMap) []string {
+	var domains []string
+	if idx := strings.IndexByte(nm.Name, '.'); idx != -1 {
+		domains = append(domains, nm.Name[idx+1:])
 	}
-	return nil
+	for _, peer := range nm.Peers {
+		idx := strings.IndexByte(peer.Name, '.')
+		if idx == -1 {
+			continue
+		}
+		domain := peer.Name[idx+1:]
+		seen := false
+		// In theory this makes the function O(n^2) worst case,
+		// but in practice we expect domains to contain very few elements
+		// (only one until invitations are introduced).
+		for _, seenDomain := range domains {
+			if domain == seenDomain {
+				seen = true
+			}
+		}
+		if !seen {
+			domains = append(domains, domain)
+		}
+	}
+	return domains
 }

 // routerConfig produces a router.Config from a wireguard config and IPN prefs.
--- a/ipn/local_test.go
+++ b/ipn/local_test.go
@@ -1,119 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ipn
-
-import (
-	"inet.af/netaddr"
-	"tailscale.com/control/controlclient"
-	"tailscale.com/tailcfg"
-	"testing"
-)
-
-func TestNetworkMapCompare(t *testing.T) {
-	prefix1, err := netaddr.ParseIPPrefix("192.168.0.0/24")
-	if err != nil {
-		t.Fatal(err)
-	}
-	node1 := &tailcfg.Node{Addresses: []netaddr.IPPrefix{prefix1}}
-
-	prefix2, err := netaddr.ParseIPPrefix("10.0.0.0/8")
-	if err != nil {
-		t.Fatal(err)
-	}
-	node2 := &tailcfg.Node{Addresses: []netaddr.IPPrefix{prefix2}}
-
-	tests := []struct {
-		name string
-		a, b *controlclient.NetworkMap
-		want bool
-	}{
-		{
-			"both nil",
-			nil,
-			nil,
-			true,
-		},
-		{
-			"b nil",
-			&controlclient.NetworkMap{},
-			nil,
-			false,
-		},
-		{
-			"a nil",
-			nil,
-			&controlclient.NetworkMap{},
-			false,
-		},
-		{
-			"both default",
-			&controlclient.NetworkMap{},
-			&controlclient.NetworkMap{},
-			true,
-		},
-		{
-			"names identical",
-			&controlclient.NetworkMap{Name: "map1"},
-			&controlclient.NetworkMap{Name: "map1"},
-			true,
-		},
-		{
-			"names differ",
-			&controlclient.NetworkMap{Name: "map1"},
-			&controlclient.NetworkMap{Name: "map2"},
-			false,
-		},
-		{
-			"Peers identical",
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{}},
-			true,
-		},
-		{
-			"Peer list length",
-			// length of Peers list differs
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{{}}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{}},
-			false,
-		},
-		{
-			"Node names identical",
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{Name: "A"}}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{Name: "A"}}},
-			true,
-		},
-		{
-			"Node names differ",
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{Name: "A"}}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{Name: "B"}}},
-			false,
-		},
-		{
-			"Node lists identical",
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{node1, node1}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{node1, node1}},
-			true,
-		},
-		{
-			"Node lists differ",
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{node1, node1}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{node1, node2}},
-			false,
-		},
-		{
-			"Node Users differ",
-			// User field is not checked.
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{User: 0}}},
-			&controlclient.NetworkMap{Peers: []*tailcfg.Node{&tailcfg.Node{User: 1}}},
-			true,
-		},
-	}
-	for _, tt := range tests {
-		got := dnsMapsEqual(tt.a, tt.b)
-		if got != tt.want {
-			t.Errorf("%s: Equal = %v; want %v", tt.name, got, tt.want)
-		}
-	}
-}
--- a/ipn/loglines_test.go
+++ b/ipn/loglines_test.go
@@ -26,7 +26,6 @@ func TestLocalLogLines(t *testing.T) {
 		"[v1] peer keys: %s",
 		"[v1] v%v peers: %v",
 	})
-	defer logListen.Close()

 	logid := func(hex byte) logtail.PublicID {
 		var ret logtail.PublicID
@@ -41,7 +40,7 @@ func TestLocalLogLines(t *testing.T) {
 	store := &MemoryStore{
 		cache: make(map[StateKey][]byte),
 	}
-	e, err := wgengine.NewFakeUserspaceEngine(logListen.Logf, 0, nil)
+	e, err := wgengine.NewFakeUserspaceEngine(logListen.Logf, 0)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/ipn/message.go
+++ b/ipn/message.go
@@ -6,7 +6,6 @@ package ipn

 import (
 	"bytes"
-	"context"
 	"encoding/binary"
 	"encoding/json"
 	"errors"
@@ -21,24 +20,6 @@ import (
 	"tailscale.com/version"
 )

-type readOnlyContextKey struct{}
-
-// IsReadonlyContext reports whether ctx is a read-only context, as currently used
-// by Unix non-root users running the "tailscale" CLI command. They can run "status",
-// but not much else.
-func IsReadonlyContext(ctx context.Context) bool {
-	return ctx.Value(readOnlyContextKey{}) != nil
-}
-
-// ReadonlyContextOf returns ctx wrapped with a context value that
-// will make IsReadonlyContext reports true.
-func ReadonlyContextOf(ctx context.Context) context.Context {
-	if IsReadonlyContext(ctx) {
-		return ctx
-	}
-	return context.WithValue(ctx, readOnlyContextKey{}, readOnlyContextKey{})
-}
-
 var jsonEscapedZero = []byte(`\u0000`)

 type NoArgs struct{}
@@ -130,7 +111,7 @@ func (bs *BackendServer) SendInUseOtherUserErrorMessage(msg string) {

 // GotCommandMsg parses the incoming message b as a JSON Command and
 // calls GotCommand with it.
-func (bs *BackendServer) GotCommandMsg(ctx context.Context, b []byte) error {
+func (bs *BackendServer) GotCommandMsg(b []byte) error {
 	cmd := &Command{}
 	if len(b) == 0 {
 		return nil
@@ -138,15 +119,15 @@ func (bs *BackendServer) GotCommandMsg(ctx context.Context, b []byte) error {
 	if err := json.Unmarshal(b, cmd); err != nil {
 		return err
 	}
-	return bs.GotCommand(ctx, cmd)
+	return bs.GotCommand(cmd)
 }

-func (bs *BackendServer) GotFakeCommand(ctx context.Context, cmd *Command) error {
+func (bs *BackendServer) GotFakeCommand(cmd *Command) error {
 	cmd.Version = version.Long
-	return bs.GotCommand(ctx, cmd)
+	return bs.GotCommand(cmd)
 }

-func (bs *BackendServer) GotCommand(ctx context.Context, cmd *Command) error {
+func (bs *BackendServer) GotCommand(cmd *Command) error {
 	if cmd.Version != version.Long && !cmd.AllowVersionSkew {
 		vs := fmt.Sprintf("GotCommand: Version mismatch! frontend=%#v backend=%#v",
 			cmd.Version, version.Long)
@@ -160,33 +141,12 @@ func (bs *BackendServer) GotCommand(ctx context.Context, cmd *Command) error {
 		})
 		return nil
 	}
-
-	// TODO(bradfitz): finish plumbing context down to all the methods below;
-	// currently we just check for read-only contexts in this method and
-	// then never use contexts again.
-
-	// Actions permitted with a read-only context:
-	if c := cmd.RequestEngineStatus; c != nil {
-		bs.b.RequestEngineStatus()
-		return nil
-	} else if c := cmd.RequestStatus; c != nil {
-		bs.b.RequestStatus()
-		return nil
-	} else if c := cmd.Ping; c != nil {
-		bs.b.Ping(c.IP)
-		return nil
-	}
-
-	if IsReadonlyContext(ctx) {
-		msg := "permission denied"
-		bs.send(Notify{ErrMessage: &msg})
-		return nil
-	}
-
 	if cmd.Quit != nil {
 		bs.GotQuit = true
 		return errors.New("Quit command received")
-	} else if c := cmd.Start; c != nil {
+	}
+
+	if c := cmd.Start; c != nil {
 		opts := c.Opts
 		opts.Notify = bs.send
 		return bs.b.Start(opts)
@@ -205,17 +165,27 @@ func (bs *BackendServer) GotCommand(ctx context.Context, cmd *Command) error {
 	} else if c := cmd.SetWantRunning; c != nil {
 		bs.b.SetWantRunning(*c)
 		return nil
+	} else if c := cmd.RequestEngineStatus; c != nil {
+		bs.b.RequestEngineStatus()
+		return nil
+	} else if c := cmd.RequestStatus; c != nil {
+		bs.b.RequestStatus()
+		return nil
 	} else if c := cmd.FakeExpireAfter; c != nil {
 		bs.b.FakeExpireAfter(c.Duration)
 		return nil
+	} else if c := cmd.Ping; c != nil {
+		bs.b.Ping(c.IP)
+		return nil
+	} else {
+		return fmt.Errorf("BackendServer.Do: no command specified")
 	}
-	return fmt.Errorf("BackendServer.Do: no command specified")
 }

-func (bs *BackendServer) Reset(ctx context.Context) error {
+func (bs *BackendServer) Reset() error {
 	// Tell the backend we got a Logout command, which will cause it
 	// to forget all its authentication information.
-	return bs.GotFakeCommand(ctx, &Command{Logout: &NoArgs{}})
+	return bs.GotFakeCommand(&Command{Logout: &NoArgs{}})
 }

 type BackendClient struct {
--- a/ipn/message_test.go
+++ b/ipn/message_test.go
@@ -6,7 +6,6 @@ package ipn

 import (
 	"bytes"
-	"context"
 	"testing"
 	"time"

@@ -82,7 +81,7 @@ func TestClientServer(t *testing.T) {
 		serverToClientCh <- append([]byte{}, b...)
 	}
 	clientToServer := func(b []byte) {
-		bs.GotCommandMsg(context.TODO(), b)
+		bs.GotCommandMsg(b)
 	}
 	slogf := func(fmt string, args ...interface{}) {
 		t.Logf("s: "+fmt, args...)
--- a/ipn/prefs.go
+++ b/ipn/prefs.go
@@ -296,7 +296,7 @@ func SavePrefs(filename string, p *Prefs) {
 	log.Printf("Saving prefs %v %v\n", filename, p.Pretty())
 	data := p.ToBytes()
 	os.MkdirAll(filepath.Dir(filename), 0700)
-	if err := atomicfile.WriteFile(filename, data, 0600); err != nil {
+	if err := atomicfile.WriteFile(filename, data, 0666); err != nil {
 		log.Printf("SavePrefs: %v\n", err)
 	}
 }
--- a/logtail/filch/filch.go
+++ b/logtail/filch/filch.go
@@ -131,11 +131,11 @@ func New(filePrefix string, opts Options) (f *Filch, err error) {
 	path1 := filePrefix + ".log1.txt"
 	path2 := filePrefix + ".log2.txt"

-	f1, err = os.OpenFile(path1, os.O_CREATE|os.O_RDWR, 0600)
+	f1, err = os.OpenFile(path1, os.O_CREATE|os.O_RDWR, 0666)
 	if err != nil {
 		return nil, err
 	}
-	f2, err = os.OpenFile(path2, os.O_CREATE|os.O_RDWR, 0600)
+	f2, err = os.OpenFile(path2, os.O_CREATE|os.O_RDWR, 0666)
 	if err != nil {
 		return nil, err
 	}
--- a/logtail/logtail_test.go
+++ b/logtail/logtail_test.go
@@ -6,12 +6,6 @@ package logtail

 import (
 	"context"
-	"encoding/json"
-	"io"
-	"io/ioutil"
-	"net/http"
-	"net/http/httptest"
-	"strings"
 	"testing"
 	"time"
 )
@@ -20,209 +14,10 @@ func TestFastShutdown(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	cancel()

-	testServ := httptest.NewServer(http.HandlerFunc(
-		func(w http.ResponseWriter, r *http.Request) {}))
-	defer testServ.Close()
-
 	l := NewLogger(Config{
-		BaseURL: testServ.URL,
+		BaseURL: "http://localhost:1234",
 	}, t.Logf)
-	err := l.Shutdown(ctx)
-	if err != nil {
-		t.Error(err)
-	}
-}
-
-// maximum number of times a test will call l.Write()
-const logLines = 3
-
-type LogtailTestServer struct {
-	srv      *httptest.Server // Log server
-	uploaded chan []byte
-}
-
-func NewLogtailTestHarness(t *testing.T) (*LogtailTestServer, *Logger) {
-	ts := LogtailTestServer{}
-
-	// max channel backlog = 1 "started" + #logLines x "log line" + 1 "closed"
-	ts.uploaded = make(chan []byte, 2+logLines)
-
-	ts.srv = httptest.NewServer(http.HandlerFunc(
-		func(w http.ResponseWriter, r *http.Request) {
-			body, err := ioutil.ReadAll(r.Body)
-			if err != nil {
-				t.Error("failed to read HTTP request")
-			}
-			ts.uploaded <- body
-		}))
-
-	t.Cleanup(ts.srv.Close)
-
-	l := NewLogger(Config{BaseURL: ts.srv.URL}, t.Logf)
-
-	// There is always an initial "logtail started" message
-	body := <-ts.uploaded
-	if !strings.Contains(string(body), "started") {
-		t.Errorf("unknown start logging statement: %q", string(body))
-	}
-
-	return &ts, l
-}
-
-func TestDrainPendingMessages(t *testing.T) {
-	ts, l := NewLogtailTestHarness(t)
-
-	for i := 0; i < logLines; i++ {
-		l.Write([]byte("log line"))
-	}
-
-	// all of the "log line" messages usually arrive at once, but poll if needed.
-	body := ""
-	for i := 0; i <= logLines; i++ {
-		body += string(<-ts.uploaded)
-		count := strings.Count(body, "log line")
-		if count == logLines {
-			break
-		}
-		// if we never find count == logLines, the test will eventually time out.
-	}
-
-	err := l.Shutdown(context.Background())
-	if err != nil {
-		t.Error(err)
-	}
-}
-
-func TestEncodeAndUploadMessages(t *testing.T) {
-	ts, l := NewLogtailTestHarness(t)
-
-	tests := []struct {
-		name string
-		log  string
-		want string
-	}{
-		{
-			"plain text",
-			"log line",
-			"log line",
-		},
-		{
-			"simple JSON",
-			`{"text": "log line"}`,
-			"log line",
-		},
-	}
-
-	for _, tt := range tests {
-		io.WriteString(l, tt.log)
-		body := <-ts.uploaded
-
-		data := make(map[string]interface{})
-		err := json.Unmarshal(body, &data)
-		if err != nil {
-			t.Error(err)
-		}
-
-		got := data["text"]
-		if got != tt.want {
-			t.Errorf("%s: got %q; want %q", tt.name, got.(string), tt.want)
-		}
-
-		ltail, ok := data["logtail"]
-		if ok {
-			logtailmap := ltail.(map[string]interface{})
-			_, ok = logtailmap["client_time"]
-			if !ok {
-				t.Errorf("%s: no client_time present", tt.name)
-			}
-		} else {
-			t.Errorf("%s: no logtail map present", tt.name)
-		}
-	}
-
-	err := l.Shutdown(context.Background())
-	if err != nil {
-		t.Error(err)
-	}
-}
-
-func TestEncodeSpecialCases(t *testing.T) {
-	ts, l := NewLogtailTestHarness(t)
-
-	// -------------------------------------------------------------------------
-
-	// JSON log message already contains a logtail field.
-	io.WriteString(l, `{"logtail": "LOGTAIL", "text": "text"}`)
-	body := <-ts.uploaded
-	data := make(map[string]interface{})
-	err := json.Unmarshal(body, &data)
-	if err != nil {
-		t.Error(err)
-	}
-	errorHasLogtail, ok := data["error_has_logtail"]
-	if ok {
-		if errorHasLogtail != "LOGTAIL" {
-			t.Errorf("error_has_logtail: got:%q; want:%q",
-				errorHasLogtail, "LOGTAIL")
-		}
-	} else {
-		t.Errorf("no error_has_logtail field: %v", data)
-	}
-
-	// -------------------------------------------------------------------------
-
-	// special characters
-	io.WriteString(l, "\b\f\n\r\t"+`"\`)
-	bodytext := string(<-ts.uploaded)
-	// json.Unmarshal would unescape the characters, we have to look at the encoded text
-	escaped := strings.Contains(bodytext, `\b\f\n\r\t\"\`)
-	if !escaped {
-		t.Errorf("special characters got %s", bodytext)
-	}
-
-	// -------------------------------------------------------------------------
-
-	// skipClientTime to omit the logtail metadata
-	l.skipClientTime = true
-	io.WriteString(l, "text")
-	body = <-ts.uploaded
-	data = make(map[string]interface{})
-	err = json.Unmarshal(body, &data)
-	if err != nil {
-		t.Error(err)
-	}
-	_, ok = data["logtail"]
-	if ok {
-		t.Errorf("skipClientTime: unexpected logtail map present: %v", data)
-	}
-
-	// -------------------------------------------------------------------------
-
-	// lowMem + long string
-	l.skipClientTime = false
-	l.lowMem = true
-	longStr := strings.Repeat("0", 512)
-	io.WriteString(l, longStr)
-	body = <-ts.uploaded
-	data = make(map[string]interface{})
-	err = json.Unmarshal(body, &data)
-	if err != nil {
-		t.Error(err)
-	}
-	text, ok := data["text"]
-	if !ok {
-		t.Errorf("lowMem: no text %v", data)
-	}
-	if n := len(text.(string)); n > 300 {
-		t.Errorf("lowMem: got %d chars; want <300 chars", n)
-	}
-
-	// -------------------------------------------------------------------------
-
-	err = l.Shutdown(context.Background())
-	if err != nil {
-		t.Error(err)
-	}
+	l.Shutdown(ctx)
 }

 var sink []byte
@@ -252,54 +47,3 @@ func TestLoggerWriteLength(t *testing.T) {
 		t.Errorf("logger.Write wrote %d bytes, expected %d", n, len(inBuf))
 	}
 }
-
-func TestParseAndRemoveLogLevel(t *testing.T) {
-	tests := []struct {
-		log       string
-		wantLevel int
-		wantLog   string
-	}{
-		{
-			"no level",
-			0,
-			"no level",
-		},
-		{
-			"[v1] level 1",
-			1,
-			"level 1",
-		},
-		{
-			"level 1 [v1] ",
-			1,
-			"level 1 ",
-		},
-		{
-			"[v2] level 2",
-			2,
-			"level 2",
-		},
-		{
-			"level [v2] 2",
-			2,
-			"level 2",
-		},
-		{
-			"[v3] no level 3",
-			0,
-			"[v3] no level 3",
-		},
-	}
-
-	for _, tt := range tests {
-		gotLevel, gotLog := parseAndRemoveLogLevel([]byte(tt.log))
-		if gotLevel != tt.wantLevel {
-			t.Errorf("parseAndRemoveLogLevel(%q): got:%d; want %d",
-				tt.log, gotLevel, tt.wantLevel)
-		}
-		if string(gotLog) != tt.wantLog {
-			t.Errorf("parseAndRemoveLogLevel(%q): got:%q; want %q",
-				tt.log, gotLog, tt.wantLog)
-		}
-	}
-}
--- a/net/dnscache/dnscache.go
+++ b/net/dnscache/dnscache.go
@@ -71,8 +71,7 @@ type Resolver struct {
 }

 type ipCacheEntry struct {
-	ip      net.IP // either v4 or v6
-	ip6     net.IP // nil if no v4 or no v6
+	ip      net.IP
 	expires time.Time
 }

@@ -92,87 +91,78 @@ func (r *Resolver) ttl() time.Duration {

 var debug, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DNS_CACHE"))

-// LookupIP returns the host's primary IP address (either IPv4 or
-// IPv6, but preferring IPv4) and optionally its IPv6 address, if
-// there is both IPv4 and IPv6.
-//
-// If err is nil, ip will be non-nil. The v6 address may be nil even
-// with a nil error.
-func (r *Resolver) LookupIP(ctx context.Context, host string) (ip, v6 net.IP, err error) {
+// LookupIP returns the first IPv4 address found, otherwise the first IPv6 address.
+func (r *Resolver) LookupIP(ctx context.Context, host string) (net.IP, error) {
 	if ip := net.ParseIP(host); ip != nil {
 		if ip4 := ip.To4(); ip4 != nil {
-			return ip4, nil, nil
+			return ip4, nil
 		}
 		if debug {
 			log.Printf("dnscache: %q is an IP", host)
 		}
-		return ip, nil, nil
+		return ip, nil
 	}

-	if ip, ip6, ok := r.lookupIPCache(host); ok {
+	if ip, ok := r.lookupIPCache(host); ok {
 		if debug {
 			log.Printf("dnscache: %q = %v (cached)", host, ip)
 		}
-		return ip, ip6, nil
+		return ip, nil
 	}

-	type ipPair struct {
-		ip, ip6 net.IP
-	}
 	ch := r.sf.DoChan(host, func() (interface{}, error) {
-		ip, ip6, err := r.lookupIP(host)
+		ip, err := r.lookupIP(host)
 		if err != nil {
 			return nil, err
 		}
-		return ipPair{ip, ip6}, nil
+		return ip, nil
 	})
 	select {
 	case res := <-ch:
 		if res.Err != nil {
 			if r.UseLastGood {
-				if ip, ip6, ok := r.lookupIPCacheExpired(host); ok {
+				if ip, ok := r.lookupIPCacheExpired(host); ok {
 					if debug {
 						log.Printf("dnscache: %q using %v after error", host, ip)
 					}
-					return ip, ip6, nil
+					return ip, nil
 				}
 			}
 			if debug {
 				log.Printf("dnscache: error resolving %q: %v", host, res.Err)
 			}
-			return nil, nil, res.Err
+			return nil, res.Err
 		}
-		pair := res.Val.(ipPair)
-		return pair.ip, pair.ip6, nil
+		return res.Val.(net.IP), nil
 	case <-ctx.Done():
 		if debug {
 			log.Printf("dnscache: context done while resolving %q: %v", host, ctx.Err())
 		}
-		return nil, nil, ctx.Err()
+		return nil, ctx.Err()
 	}
 }

-func (r *Resolver) lookupIPCache(host string) (ip, ip6 net.IP, ok bool) {
+func (r *Resolver) lookupIPCache(host string) (ip net.IP, ok bool) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	if ent, ok := r.ipCache[host]; ok && ent.expires.After(time.Now()) {
-		return ent.ip, ent.ip6, true
+		return ent.ip, true
 	}
-	return nil, nil, false
+	return nil, false
 }

-func (r *Resolver) lookupIPCacheExpired(host string) (ip, ip6 net.IP, ok bool) {
+func (r *Resolver) lookupIPCacheExpired(host string) (ip net.IP, ok bool) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	if ent, ok := r.ipCache[host]; ok {
-		return ent.ip, ent.ip6, true
+		return ent.ip, true
 	}
-	return nil, nil, false
+	return nil, false
 }

 func (r *Resolver) lookupTimeoutForHost(host string) time.Duration {
 	if r.UseLastGood {
-		if _, _, ok := r.lookupIPCacheExpired(host); ok {
+		if _, ok := r.lookupIPCacheExpired(host); ok {
 			// If we have some previous good value for this host,
 			// don't give this DNS lookup much time. If we're in a
 			// situation where the user's DNS server is unreachable
@@ -187,52 +177,40 @@ func (r *Resolver) lookupTimeoutForHost(host string) time.Duration {
 	return 10 * time.Second
 }

-func (r *Resolver) lookupIP(host string) (ip, ip6 net.IP, err error) {
-	if ip, ip6, ok := r.lookupIPCache(host); ok {
+func (r *Resolver) lookupIP(host string) (net.IP, error) {
+	if ip, ok := r.lookupIPCache(host); ok {
 		if debug {
 			log.Printf("dnscache: %q found in cache as %v", host, ip)
 		}
-		return ip, ip6, nil
+		return ip, nil
 	}

 	ctx, cancel := context.WithTimeout(context.Background(), r.lookupTimeoutForHost(host))
 	defer cancel()
 	ips, err := r.fwd().LookupIPAddr(ctx, host)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 	if len(ips) == 0 {
-		return nil, nil, fmt.Errorf("no IPs for %q found", host)
+		return nil, fmt.Errorf("no IPs for %q found", host)
 	}

-	have4 := false
 	for _, ipa := range ips {
 		if ip4 := ipa.IP.To4(); ip4 != nil {
-			if !have4 {
-				ip6 = ip
-				ip = ip4
-				have4 = true
-			}
-		} else {
-			if have4 {
-				ip6 = ipa.IP
-			} else {
-				ip = ipa.IP
-			}
+			return r.addIPCache(host, ip4, r.ttl()), nil
 		}
 	}
-	r.addIPCache(host, ip, ip6, r.ttl())
-	return ip, ip6, nil
+	return r.addIPCache(host, ips[0].IP, r.ttl()), nil
 }

-func (r *Resolver) addIPCache(host string, ip, ip6 net.IP, d time.Duration) {
+func (r *Resolver) addIPCache(host string, ip net.IP, d time.Duration) net.IP {
 	if isPrivateIP(ip) {
 		// Don't cache obviously wrong entries from captive portals.
 		// TODO: use DoH or DoT for the forwarding resolver?
 		if debug {
 			log.Printf("dnscache: %q resolved to private IP %v; using but not caching", host, ip)
 		}
-		return
+		return ip
 	}

 	if debug {
@@ -244,7 +222,8 @@ func (r *Resolver) addIPCache(host string, ip, ip6 net.IP, d time.Duration) {
 	if r.ipCache == nil {
 		r.ipCache = make(map[string]ipCacheEntry)
 	}
-	r.ipCache[host] = ipCacheEntry{ip: ip, ip6: ip6, expires: time.Now().Add(d)}
+	r.ipCache[host] = ipCacheEntry{ip: ip, expires: time.Now().Add(d)}
+	return ip
 }

 func mustCIDR(s string) *net.IPNet {
@@ -276,7 +255,7 @@ func Dialer(fwd DialContextFunc, dnsCache *Resolver) DialContextFunc {
 			// inventing a similar one.
 			return fwd(ctx, network, address)
 		}
-		ip, ip6, err := dnsCache.LookupIP(ctx, host)
+		ip, err := dnsCache.LookupIP(ctx, host)
 		if err != nil {
 			return nil, fmt.Errorf("failed to resolve %q: %w", host, err)
 		}
@@ -284,19 +263,6 @@ func Dialer(fwd DialContextFunc, dnsCache *Resolver) DialContextFunc {
 		if debug {
 			log.Printf("dnscache: dialing %s, %s for %s", network, dst, address)
 		}
-		c, err := fwd(ctx, network, dst)
-		if err == nil || ctx.Err() != nil || ip6 == nil {
-			return c, err
-		}
-		// Fall back to trying IPv6.
-		// TODO(bradfitz): this is a primarily for IPv6-only
-		// hosts; it's not supposed to be a real Happy
-		// Eyeballs implementation. We should use the net
-		// package's implementation of that by plumbing this
-		// dnscache impl into net.Dialer.Resolver.Dial and
-		// unmarshal/marshal DNS queries/responses to the net
-		// package. This works for v6-only hosts for now.
-		dst = net.JoinHostPort(ip6.String(), port)
 		return fwd(ctx, network, dst)
 	}
 }
--- a/net/flowtrack/flowtrack.go
+++ b/net/flowtrack/flowtrack.go
@@ -1,104 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-//
-// Original implementation (from same author) from which this was derived was:
-// https://github.com/golang/groupcache/blob/5b532d6fd5efaf7fa130d4e859a2fde0fc3a9e1b/lru/lru.go
-// ... which was Apache licensed:
-// https://github.com/golang/groupcache/blob/master/LICENSE
-
-// Package flowtrack contains types for tracking TCP/UDP flows by 4-tuples.
-package flowtrack
-
-import (
-	"container/list"
-	"fmt"
-
-	"inet.af/netaddr"
-)
-
-// Tuple is a 4-tuple of source and destination IP and port.
-type Tuple struct {
-	Src netaddr.IPPort
-	Dst netaddr.IPPort
-}
-
-func (t Tuple) String() string {
-	return fmt.Sprintf("(%v => %v)", t.Src, t.Dst)
-}
-
-// Cache is an LRU cache keyed by Tuple.
-//
-// The zero value is valid to use.
-//
-// It is not safe for concurrent access.
-type Cache struct {
-	// MaxEntries is the maximum number of cache entries before
-	// an item is evicted. Zero means no limit.
-	MaxEntries int
-
-	ll *list.List
-	m  map[Tuple]*list.Element // of *entry
-}
-
-// entry is the container/list element type.
-type entry struct {
-	key   Tuple
-	value interface{}
-}
-
-// Add adds a value to the cache, set or updating its assoicated
-// value.
-//
-// If MaxEntries is non-zero and the length of the cache is greater
-// after any addition, the least recently used value is evicted.
-func (c *Cache) Add(key Tuple, value interface{}) {
-	if c.m == nil {
-		c.m = make(map[Tuple]*list.Element)
-		c.ll = list.New()
-	}
-	if ee, ok := c.m[key]; ok {
-		c.ll.MoveToFront(ee)
-		ee.Value.(*entry).value = value
-		return
-	}
-	ele := c.ll.PushFront(&entry{key, value})
-	c.m[key] = ele
-	if c.MaxEntries != 0 && c.Len() > c.MaxEntries {
-		c.RemoveOldest()
-	}
-}
-
-// Get looks up a key's value from the cache, also reporting
-// whether it was present.
-func (c *Cache) Get(key Tuple) (value interface{}, ok bool) {
-	if ele, hit := c.m[key]; hit {
-		c.ll.MoveToFront(ele)
-		return ele.Value.(*entry).value, true
-	}
-	return nil, false
-}
-
-// Remove removes the provided key from the cache if it was present.
-func (c *Cache) Remove(key Tuple) {
-	if ele, hit := c.m[key]; hit {
-		c.removeElement(ele)
-	}
-}
-
-// RemoveOldest removes the oldest item from the cache, if any.
-func (c *Cache) RemoveOldest() {
-	if c.ll != nil {
-		if ele := c.ll.Back(); ele != nil {
-			c.removeElement(ele)
-		}
-	}
-}
-
-func (c *Cache) removeElement(e *list.Element) {
-	c.ll.Remove(e)
-	delete(c.m, e.Value.(*entry).key)
-}
-
-// Len returns the number of items in the cache.
-func (c *Cache) Len() int { return len(c.m) }
--- a/net/flowtrack/flowtrack_test.go
+++ b/net/flowtrack/flowtrack_test.go
@@ -1,82 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package flowtrack
-
-import (
-	"testing"
-
-	"inet.af/netaddr"
-)
-
-func TestCache(t *testing.T) {
-	c := &Cache{MaxEntries: 2}
-
-	k1 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("1.1.1.1:1")}
-	k2 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("2.2.2.2:2")}
-	k3 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("3.3.3.3:3")}
-	k4 := Tuple{Src: netaddr.MustParseIPPort("1.1.1.1:1"), Dst: netaddr.MustParseIPPort("4.4.4.4:4")}
-
-	wantLen := func(want int) {
-		t.Helper()
-		if got := c.Len(); got != want {
-			t.Fatalf("Len = %d; want %d", got, want)
-		}
-	}
-	wantVal := func(key Tuple, want interface{}) {
-		t.Helper()
-		got, ok := c.Get(key)
-		if !ok {
-			t.Fatalf("Get(%q) failed; want value %v", key, want)
-		}
-		if got != want {
-			t.Fatalf("Get(%q) = %v; want %v", key, got, want)
-		}
-	}
-	wantMissing := func(key Tuple) {
-		t.Helper()
-		if got, ok := c.Get(key); ok {
-			t.Fatalf("Get(%q) = %v; want absent from cache", key, got)
-		}
-	}
-
-	wantLen(0)
-	c.RemoveOldest() // shouldn't panic
-	c.Remove(k4)     // shouldn't panic
-
-	c.Add(k1, 1)
-	wantLen(1)
-	c.Add(k2, 2)
-	wantLen(2)
-	c.Add(k3, 3)
-	wantLen(2) // hit the max
-
-	wantMissing(k1)
-	c.Remove(k1)
-	wantLen(2) // no change; k1 should've been the deleted one per LRU
-
-	wantVal(k3, 3)
-
-	wantVal(k2, 2)
-	c.Remove(k2)
-	wantLen(1)
-	wantMissing(k2)
-
-	c.Add(k3, 30)
-	wantVal(k3, 30)
-	wantLen(1)
-
-	allocs := int(testing.AllocsPerRun(1000, func() {
-		got, ok := c.Get(k3)
-		if !ok {
-			t.Fatal("missing k3")
-		}
-		if got != 30 {
-			t.Fatalf("got = %d; want 30", got)
-		}
-	}))
-	if allocs != 0 {
-		t.Errorf("allocs = %v; want 0", allocs)
-	}
-}
--- a/net/netcheck/netcheck.go
+++ b/net/netcheck/netcheck.go
@@ -1102,10 +1102,6 @@ func (c *Client) addReportHistoryAndSetPreferredDERP(r *Report) {
 	c.mu.Lock()
 	defer c.mu.Unlock()

-	var prevDERP int
-	if c.last != nil {
-		prevDERP = c.last.PreferredDERP
-	}
 	if c.prev == nil {
 		c.prev = map[time.Time]*Report{}
 	}
@@ -1123,9 +1119,9 @@ func (c *Client) addReportHistoryAndSetPreferredDERP(r *Report) {
 			delete(c.prev, t)
 			continue
 		}
-		for regionID, d := range pr.RegionLatency {
-			if bd, ok := bestRecent[regionID]; !ok || d < bd {
-				bestRecent[regionID] = d
+		for hp, d := range pr.RegionLatency {
+			if bd, ok := bestRecent[hp]; !ok || d < bd {
+				bestRecent[hp] = d
 			}
 		}
 	}
@@ -1133,27 +1129,13 @@ func (c *Client) addReportHistoryAndSetPreferredDERP(r *Report) {
 	// Then, pick which currently-alive DERP server from the
 	// current report has the best latency over the past maxAge.
 	var bestAny time.Duration
-	var oldRegionCurLatency time.Duration
-	for regionID, d := range r.RegionLatency {
-		if regionID == prevDERP {
-			oldRegionCurLatency = d
-		}
-		best := bestRecent[regionID]
+	for hp := range r.RegionLatency {
+		best := bestRecent[hp]
 		if r.PreferredDERP == 0 || best < bestAny {
 			bestAny = best
-			r.PreferredDERP = regionID
+			r.PreferredDERP = hp
 		}
 	}
-
-	// If we're changing our preferred DERP but the old one's still
-	// accessible and the new one's not much better, just stick with
-	// where we are.
-	if prevDERP != 0 &&
-		r.PreferredDERP != prevDERP &&
-		oldRegionCurLatency != 0 &&
-		bestAny > oldRegionCurLatency/3*2 {
-		r.PreferredDERP = prevDERP
-	}
 }

 func updateLatency(m map[int]time.Duration, regionID int, d time.Duration) {
--- a/net/netcheck/netcheck_test.go
+++ b/net/netcheck/netcheck_test.go
@@ -195,24 +195,6 @@ func TestAddReportHistoryAndSetPreferredDERP(t *testing.T) {
 			wantPrevLen: 1, // t=[0123]s all gone. (too old, older than 10 min)
 			wantDERP:    3, // only option
 		},
-		{
-			name: "preferred_derp_hysteresis_no_switch",
-			steps: []step{
-				{0 * time.Second, report("d1", 4, "d2", 5)},
-				{1 * time.Second, report("d1", 4, "d2", 3)},
-			},
-			wantPrevLen: 2,
-			wantDERP:    1, // 2 didn't get fast enough
-		},
-		{
-			name: "preferred_derp_hysteresis_do_switch",
-			steps: []step{
-				{0 * time.Second, report("d1", 4, "d2", 5)},
-				{1 * time.Second, report("d1", 4, "d2", 1)},
-			},
-			wantPrevLen: 2,
-			wantDERP:    2, // 2 got fast enough
-		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -578,41 +560,3 @@ func TestLogConciseReport(t *testing.T) {
 		})
 	}
 }
-
-func TestSortRegions(t *testing.T) {
-	unsortedMap := &tailcfg.DERPMap{
-		Regions: map[int]*tailcfg.DERPRegion{},
-	}
-	for rid := 1; rid <= 5; rid++ {
-		var nodes []*tailcfg.DERPNode
-		nodes = append(nodes, &tailcfg.DERPNode{
-			Name:     fmt.Sprintf("%da", rid),
-			RegionID: rid,
-			HostName: fmt.Sprintf("derp%d-1", rid),
-			IPv4:     fmt.Sprintf("%d.0.0.1", rid),
-			IPv6:     fmt.Sprintf("%d::1", rid),
-		})
-		unsortedMap.Regions[rid] = &tailcfg.DERPRegion{
-			RegionID: rid,
-			Nodes:    nodes,
-		}
-	}
-	report := newReport()
-	report.RegionLatency[1] = time.Second * time.Duration(5)
-	report.RegionLatency[2] = time.Second * time.Duration(3)
-	report.RegionLatency[3] = time.Second * time.Duration(6)
-	report.RegionLatency[4] = time.Second * time.Duration(0)
-	report.RegionLatency[5] = time.Second * time.Duration(2)
-	sortedMap := sortRegions(unsortedMap, report)
-
-	// Sorting by latency this should result in rid: 5, 2, 1, 3
-	// rid 4 with latency 0 should be at the end
-	want := []int{5, 2, 1, 3, 4}
-	got := make([]int, len(sortedMap))
-	for i, r := range sortedMap {
-		got[i] = r.RegionID
-	}
-	if !reflect.DeepEqual(got, want) {
-		t.Errorf("got %v; want %v", got, want)
-	}
-}
--- a/net/nettest/pipe.go
+++ b/net/nettest/pipe.go
@@ -60,7 +60,7 @@ func (p *Pipe) Read(b []byte) (n int, err error) {
 	for {
 		p.mu.Lock()
 		closed := p.closed
-		timedout := !p.readTimeout.IsZero() && !time.Now().Before(p.readTimeout)
+		timedout := !p.readTimeout.IsZero() && time.Now().After(p.readTimeout)
 		blocked := p.blocked
 		if !closed && !timedout && len(p.buf) > 0 {
 			n2 := copy(b, p.buf)
@@ -99,7 +99,7 @@ func (p *Pipe) Write(b []byte) (n int, err error) {
 	for {
 		p.mu.Lock()
 		closed := p.closed
-		timedout := !p.writeTimeout.IsZero() && !time.Now().Before(p.writeTimeout)
+		timedout := !p.writeTimeout.IsZero() && time.Now().After(p.writeTimeout)
 		blocked := p.blocked
 		if !closed && !timedout {
 			n2 := len(b)
--- a/net/nettest/pipe_test.go
+++ b/net/nettest/pipe_test.go
@@ -35,7 +35,7 @@ func TestPipeTimeout(t *testing.T) {
 		p := NewPipe("p1", 1<<16)
 		p.SetWriteDeadline(time.Now().Add(-1 * time.Second))
 		n, err := p.Write([]byte{'h'})
-		if !errors.Is(err, ErrWriteTimeout) || !errors.Is(err, ErrTimeout) {
+		if err == nil || !errors.Is(err, ErrWriteTimeout) || !errors.Is(err, ErrTimeout) {
 			t.Errorf("missing write timeout got err: %v", err)
 		}
 		if n != 0 {
@@ -49,7 +49,7 @@ func TestPipeTimeout(t *testing.T) {
 		p.SetReadDeadline(time.Now().Add(-1 * time.Second))
 		b := make([]byte, 1)
 		n, err := p.Read(b)
-		if !errors.Is(err, ErrReadTimeout) || !errors.Is(err, ErrTimeout) {
+		if err == nil || !errors.Is(err, ErrReadTimeout) || !errors.Is(err, ErrTimeout) {
 			t.Errorf("missing read timeout got err: %v", err)
 		}
 		if n != 0 {
@@ -65,7 +65,7 @@ func TestPipeTimeout(t *testing.T) {
 		if err := p.Block(); err != nil {
 			t.Fatal(err)
 		}
-		if _, err := p.Write([]byte{'h'}); !errors.Is(err, ErrWriteTimeout) {
+		if _, err := p.Write([]byte{'h'}); err == nil || !errors.Is(err, ErrWriteTimeout) {
 			t.Fatalf("want write timeout got: %v", err)
 		}
 	})
@@ -80,10 +80,11 @@ func TestPipeTimeout(t *testing.T) {
 		if err := p.Block(); err != nil {
 			t.Fatal(err)
 		}
-		if _, err := p.Read(b); !errors.Is(err, ErrReadTimeout) {
+		if _, err := p.Read(b); err == nil || !errors.Is(err, ErrReadTimeout) {
 			t.Fatalf("want read timeout got: %v", err)
 		}
 	})
+
 }

 func TestLimit(t *testing.T) {
@@ -116,8 +117,4 @@ func TestLimit(t *testing.T) {
 	} else if n != 1 {
 		t.Errorf("Read(%q): n=%d want 1", string(b), n)
 	}
-
-	if err := <-errCh; err != nil {
-		t.Error(err)
-	}
 }
--- a/net/packet/header.go
+++ b/net/packet/header.go
@@ -36,6 +36,9 @@ type Header interface {
 	// purpose of computing length and checksum fields. Marshal
 	// implementations must not allocate memory.
 	Marshal(buf []byte) error
+	// ToResponse transforms the header into one for a response packet.
+	// For instance, this swaps the source and destination IPs.
+	ToResponse()
 }

 // Generate generates a new packet with the given Header and
--- a/net/packet/ip.go
+++ b/net/packet/ip.go
@@ -24,17 +24,6 @@ const (
 	TCP    IPProto = 0x06
 	UDP    IPProto = 0x11

-	// TSMP is the Tailscale Message Protocol (our ICMP-ish
-	// thing), an IP protocol used only between Tailscale nodes
-	// (still encrypted by WireGuard) that communicates why things
-	// failed, etc.
-	//
-	// Proto number 99 is reserved for "any private encryption
-	// scheme". We never accept these from the host OS stack nor
-	// send them to the host network stack. It's only used between
-	// nodes.
-	TSMP IPProto = 99
-
 	// Fragment represents any non-first IP fragment, for which we
 	// don't have the sub-protocol header (and therefore can't
 	// figure out what the sub-protocol is).
@@ -58,8 +47,6 @@ func (p IPProto) String() string {
 		return "UDP"
 	case TCP:
 		return "TCP"
-	case TSMP:
-		return "TSMP"
 	default:
 		return "Unknown"
 	}
--- a/net/packet/packet.go
+++ b/net/packet/packet.go
@@ -17,15 +17,10 @@ import (
 // RFC1858: prevent overlapping fragment attacks.
 const minFrag = 60 + 20 // max IPv4 header + basic TCP header

-type TCPFlag uint8
-
 const (
-	TCPFin    TCPFlag = 0x01
-	TCPSyn    TCPFlag = 0x02
-	TCPRst    TCPFlag = 0x04
-	TCPPsh    TCPFlag = 0x08
-	TCPAck    TCPFlag = 0x10
-	TCPSynAck TCPFlag = TCPSyn | TCPAck
+	TCPSyn    = 0x02
+	TCPAck    = 0x10
+	TCPSynAck = TCPSyn | TCPAck
 )

 // Parsed is a minimal decoding of a packet suitable for use in filters.
@@ -51,7 +46,7 @@ type Parsed struct {
 	// DstIP4 is the destination address. Family matches IPVersion.
 	Dst netaddr.IPPort
 	// TCPFlags is the packet's TCP flag bigs. Valid iff IPProto == TCP.
-	TCPFlags TCPFlag
+	TCPFlags uint8
 }

 func (p *Parsed) String() string {
@@ -191,7 +186,7 @@ func (q *Parsed) decode4(b []byte) {
 			}
 			q.Src.Port = binary.BigEndian.Uint16(sub[0:2])
 			q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
-			q.TCPFlags = TCPFlag(sub[13]) & 0x3F
+			q.TCPFlags = sub[13] & 0x3F
 			headerLength := (sub[12] & 0xF0) >> 2
 			q.dataofs = q.subofs + int(headerLength)
 			return
@@ -204,10 +199,6 @@ func (q *Parsed) decode4(b []byte) {
 			q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
 			q.dataofs = q.subofs + udpHeaderLength
 			return
-		case TSMP:
-			// Inter-tailscale messages.
-			q.dataofs = q.subofs
-			return
 		default:
 			q.IPProto = Unknown
 			return
@@ -283,7 +274,7 @@ func (q *Parsed) decode6(b []byte) {
 		}
 		q.Src.Port = binary.BigEndian.Uint16(sub[0:2])
 		q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
-		q.TCPFlags = TCPFlag(sub[13]) & 0x3F
+		q.TCPFlags = sub[13] & 0x3F
 		headerLength := (sub[12] & 0xF0) >> 2
 		q.dataofs = q.subofs + int(headerLength)
 		return
@@ -295,10 +286,6 @@ func (q *Parsed) decode6(b []byte) {
 		q.Src.Port = binary.BigEndian.Uint16(sub[0:2])
 		q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
 		q.dataofs = q.subofs + udpHeaderLength
-	case TSMP:
-		// Inter-tailscale messages.
-		q.dataofs = q.subofs
-		return
 	default:
 		q.IPProto = Unknown
 		return
--- a/net/packet/packet_test.go
+++ b/net/packet/packet_test.go
@@ -274,38 +274,7 @@ var igmpPacketDecode = Parsed{
 	Dst:       mustIPPort("224.0.0.251:0"),
 }

-var ipv4TSMPBuffer = []byte{
-	// IPv4 header:
-	0x45, 0x00,
-	0x00, 0x1b, // 20 + 7 bytes total
-	0x00, 0x00, // ID
-	0x00, 0x00, // Fragment
-	0x40, // TTL
-	byte(TSMP),
-	0x5f, 0xc3, // header checksum (wrong here)
-	// source IP:
-	0x64, 0x5e, 0x0c, 0x0e,
-	// dest IP:
-	0x64, 0x4a, 0x46, 0x03,
-	byte(TSMPTypeRejectedConn),
-	byte(TCP),
-	byte(RejectedDueToACLs),
-	0x00, 123, // src port
-	0x00, 80, // dst port
-}
-
-var ipv4TSMPDecode = Parsed{
-	b:         ipv4TSMPBuffer,
-	subofs:    20,
-	dataofs:   20,
-	length:    27,
-	IPVersion: 4,
-	IPProto:   TSMP,
-	Src:       mustIPPort("100.94.12.14:0"),
-	Dst:       mustIPPort("100.74.70.3:0"),
-}
-
-func TestParsedString(t *testing.T) {
+func TestParsed(t *testing.T) {
 	tests := []struct {
 		name    string
 		qdecode Parsed
@@ -319,7 +288,6 @@ func TestParsedString(t *testing.T) {
 		{"icmp6", icmp6PacketDecode, "ICMPv6{[fe80::fb57:1dea:9c39:8fb7]:0 > [ff02::2]:0}"},
 		{"igmp", igmpPacketDecode, "IGMP{192.168.1.82:0 > 224.0.0.251:0}"},
 		{"unknown", unknownPacketDecode, "Unknown{???}"},
-		{"ipv4_tsmp", ipv4TSMPDecode, "TSMP{100.94.12.14:0 > 100.74.70.3:0}"},
 	}

 	for _, tt := range tests {
@@ -356,7 +324,6 @@ func TestDecode(t *testing.T) {
 		{"igmp", igmpPacketBuffer, igmpPacketDecode},
 		{"unknown", unknownPacketBuffer, unknownPacketDecode},
 		{"invalid4", invalid4RequestBuffer, invalid4RequestDecode},
-		{"ipv4_tsmp", ipv4TSMPBuffer, ipv4TSMPDecode},
 	}

 	for _, tt := range tests {
@@ -364,7 +331,7 @@ func TestDecode(t *testing.T) {
 			var got Parsed
 			got.Decode(tt.buf)
 			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("mismatch\n got: %s %#v\nwant: %s %#v", got.String(), got, tt.want.String(), tt.want)
+				t.Errorf("mismatch\n got: %#v\nwant: %#v", got, tt.want)
 			}
 		})
 	}
@@ -449,16 +416,9 @@ func TestMarshalResponse(t *testing.T) {
 	icmpHeader := icmp4RequestDecode.ICMP4Header()
 	udpHeader := udp4RequestDecode.UDP4Header()

-	type HeaderToResponser interface {
-		Header
-		// ToResponse transforms the header into one for a response packet.
-		// For instance, this swaps the source and destination IPs.
-		ToResponse()
-	}
-
 	tests := []struct {
 		name   string
-		header HeaderToResponser
+		header Header
 		want   []byte
 	}{
 		{"icmp", &icmpHeader, icmp4ReplyBuffer},
--- a/net/packet/tsmp.go
+++ b/net/packet/tsmp.go
@@ -1,140 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// TSMP is our ICMP-like "Tailscale Message Protocol" for signaling
-// Tailscale-specific messages between nodes. It uses IP protocol 99
-// (reserved for "any private encryption scheme") within
-// Wireguard's normal encryption between peers and never hits the host
-// network stack.
-
-package packet
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-
-	"inet.af/netaddr"
-	"tailscale.com/net/flowtrack"
-)
-
-// TailscaleRejectedHeader is a TSMP message that says that one
-// Tailscale node has rejected the connection from another. Unlike a
-// TCP RST, this includes a reason.
-//
-// On the wire, after the IP header, it's currently 7 bytes:
-//     * '!'
-//     * IPProto byte (IANA protocol number: TCP or UDP)
-//     * 'A' or 'S' (RejectedDueToACLs, RejectedDueToShieldsUp)
-//     * srcPort big endian uint16
-//     * dstPort big endian uint16
-//
-// In the future it might also accept 16 byte IP flow src/dst IPs
-// after the header, if they're different than the IP-level ones.
-type TailscaleRejectedHeader struct {
-	IPSrc  netaddr.IP            // IPv4 or IPv6 header's src IP
-	IPDst  netaddr.IP            // IPv4 or IPv6 header's dst IP
-	Src    netaddr.IPPort        // rejected flow's src
-	Dst    netaddr.IPPort        // rejected flow's dst
-	Proto  IPProto               // proto that was rejected (TCP or UDP)
-	Reason TailscaleRejectReason // why the connection was rejected
-}
-
-func (rh TailscaleRejectedHeader) Flow() flowtrack.Tuple {
-	return flowtrack.Tuple{Src: rh.Src, Dst: rh.Dst}
-}
-
-func (rh TailscaleRejectedHeader) String() string {
-	return fmt.Sprintf("TSMP-reject-flow{%s %s > %s}: %s", rh.Proto, rh.Src, rh.Dst, rh.Reason)
-}
-
-type TSMPType uint8
-
-const (
-	TSMPTypeRejectedConn TSMPType = '!'
-)
-
-type TailscaleRejectReason byte
-
-const (
-	RejectedDueToACLs      TailscaleRejectReason = 'A'
-	RejectedDueToShieldsUp TailscaleRejectReason = 'S'
-)
-
-func (r TailscaleRejectReason) String() string {
-	switch r {
-	case RejectedDueToACLs:
-		return "acl"
-	case RejectedDueToShieldsUp:
-		return "shields"
-	}
-	return fmt.Sprintf("0x%02x", byte(r))
-}
-
-func (h TailscaleRejectedHeader) Len() int {
-	var ipHeaderLen int
-	if h.IPSrc.Is4() {
-		ipHeaderLen = ip4HeaderLength
-	} else if h.IPSrc.Is6() {
-		ipHeaderLen = ip6HeaderLength
-	}
-	return ipHeaderLen +
-		1 + // TSMPType byte
-		1 + // IPProto byte
-		1 + // TailscaleRejectReason byte
-		2*2 // 2 uint16 ports
-}
-
-func (h TailscaleRejectedHeader) Marshal(buf []byte) error {
-	if len(buf) < h.Len() {
-		return errSmallBuffer
-	}
-	if len(buf) > maxPacketLength {
-		return errLargePacket
-	}
-	if h.Src.IP.Is4() {
-		iph := IP4Header{
-			IPProto: TSMP,
-			Src:     h.IPSrc,
-			Dst:     h.IPDst,
-		}
-		iph.Marshal(buf)
-		buf = buf[ip4HeaderLength:]
-	} else if h.Src.IP.Is6() {
-		iph := IP6Header{
-			IPProto: TSMP,
-			Src:     h.IPSrc,
-			Dst:     h.IPDst,
-		}
-		iph.Marshal(buf)
-		buf = buf[ip6HeaderLength:]
-	} else {
-		return errors.New("bogus src IP")
-	}
-	buf[0] = byte(TSMPTypeRejectedConn)
-	buf[1] = byte(h.Proto)
-	buf[2] = byte(h.Reason)
-	binary.BigEndian.PutUint16(buf[3:5], h.Src.Port)
-	binary.BigEndian.PutUint16(buf[5:7], h.Dst.Port)
-	return nil
-}
-
-// AsTailscaleRejectedHeader parses pp as an incoming rejection
-// connection TSMP message.
-//
-// ok reports whether pp was a valid TSMP rejection packet.
-func (pp *Parsed) AsTailscaleRejectedHeader() (h TailscaleRejectedHeader, ok bool) {
-	p := pp.Payload()
-	if len(p) < 7 || p[0] != byte(TSMPTypeRejectedConn) {
-		return
-	}
-	return TailscaleRejectedHeader{
-		Proto:  IPProto(p[1]),
-		Reason: TailscaleRejectReason(p[2]),
-		IPSrc:  pp.Src.IP,
-		IPDst:  pp.Dst.IP,
-		Src:    netaddr.IPPort{IP: pp.Dst.IP, Port: binary.BigEndian.Uint16(p[3:5])},
-		Dst:    netaddr.IPPort{IP: pp.Src.IP, Port: binary.BigEndian.Uint16(p[5:7])},
-	}, true
-}
--- a/net/packet/tsmp_test.go
+++ b/net/packet/tsmp_test.go
@@ -1,63 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package packet
-
-import (
-	"testing"
-
-	"inet.af/netaddr"
-)
-
-func TestTailscaleRejectedHeader(t *testing.T) {
-	tests := []struct {
-		h       TailscaleRejectedHeader
-		wantStr string
-	}{
-		{
-			h: TailscaleRejectedHeader{
-				IPSrc:  netaddr.MustParseIP("5.5.5.5"),
-				IPDst:  netaddr.MustParseIP("1.2.3.4"),
-				Src:    netaddr.MustParseIPPort("1.2.3.4:567"),
-				Dst:    netaddr.MustParseIPPort("5.5.5.5:443"),
-				Proto:  TCP,
-				Reason: RejectedDueToACLs,
-			},
-			wantStr: "TSMP-reject-flow{TCP 1.2.3.4:567 > 5.5.5.5:443}: acl",
-		},
-		{
-			h: TailscaleRejectedHeader{
-				IPSrc:  netaddr.MustParseIP("2::2"),
-				IPDst:  netaddr.MustParseIP("1::1"),
-				Src:    netaddr.MustParseIPPort("[1::1]:567"),
-				Dst:    netaddr.MustParseIPPort("[2::2]:443"),
-				Proto:  UDP,
-				Reason: RejectedDueToShieldsUp,
-			},
-			wantStr: "TSMP-reject-flow{UDP [1::1]:567 > [2::2]:443}: shields",
-		},
-	}
-	for i, tt := range tests {
-		gotStr := tt.h.String()
-		if gotStr != tt.wantStr {
-			t.Errorf("%v. String = %q; want %q", i, gotStr, tt.wantStr)
-			continue
-		}
-		pkt := make([]byte, tt.h.Len())
-		tt.h.Marshal(pkt)
-
-		var p Parsed
-		p.Decode(pkt)
-		t.Logf("Parsed: %+v", p)
-		t.Logf("Parsed: %s", p.String())
-		back, ok := p.AsTailscaleRejectedHeader()
-		if !ok {
-			t.Errorf("%v. %q (%02x) didn't parse back", i, gotStr, pkt)
-			continue
-		}
-		if back != tt.h {
-			t.Errorf("%v. %q parsed back as %q", i, tt.h, back)
-		}
-	}
-}
--- a/portlist/portlist_test.go
+++ b/portlist/portlist_test.go
@@ -47,153 +47,6 @@ func TestIgnoreLocallyBoundPorts(t *testing.T) {
 	}
 }

-func TestLessThan(t *testing.T) {
-	tests := []struct {
-		name string
-		a, b Port
-		want bool
-	}{
-		{
-			"Port a < b",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 101, Process: "proc1", inode: "inode1"},
-			true,
-		},
-		{
-			"Port a > b",
-			Port{Proto: "tcp", Port: 101, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			false,
-		},
-		{
-			"Proto a < b",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "udp", Port: 100, Process: "proc1", inode: "inode1"},
-			true,
-		},
-		{
-			"Proto a < b",
-			Port{Proto: "udp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			false,
-		},
-		{
-			"inode a < b",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode2"},
-			true,
-		},
-		{
-			"inode a > b",
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode2"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			false,
-		},
-		{
-			"Process a < b",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode1"},
-			true,
-		},
-		{
-			"Process a > b",
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			false,
-		},
-		{
-			"Port evaluated first",
-			Port{Proto: "udp", Port: 100, Process: "proc2", inode: "inode2"},
-			Port{Proto: "tcp", Port: 101, Process: "proc1", inode: "inode1"},
-			true,
-		},
-		{
-			"Proto evaluated second",
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode2"},
-			Port{Proto: "udp", Port: 100, Process: "proc1", inode: "inode1"},
-			true,
-		},
-		{
-			"inode evaluated third",
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode2"},
-			true,
-		},
-		{
-			"Process evaluated fourth",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc2", inode: "inode1"},
-			true,
-		},
-		{
-			"equal",
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			Port{Proto: "tcp", Port: 100, Process: "proc1", inode: "inode1"},
-			false,
-		},
-	}
-
-	for _, tt := range tests {
-		got := tt.a.lessThan(&tt.b)
-		if got != tt.want {
-			t.Errorf("%s: Equal = %v; want %v", tt.name, got, tt.want)
-		}
-	}
-}
-
-func TestSameInodes(t *testing.T) {
-	port1 := Port{Proto: "tcp", Port: 100, Process: "proc", inode: "inode1"}
-	port2 := Port{Proto: "tcp", Port: 100, Process: "proc", inode: "inode1"}
-	portProto := Port{Proto: "udp", Port: 100, Process: "proc", inode: "inode1"}
-	portPort := Port{Proto: "tcp", Port: 101, Process: "proc", inode: "inode1"}
-	portInode := Port{Proto: "tcp", Port: 100, Process: "proc", inode: "inode2"}
-	portProcess := Port{Proto: "tcp", Port: 100, Process: "other", inode: "inode1"}
-
-	tests := []struct {
-		name string
-		a, b List
-		want bool
-	}{
-		{
-			"identical",
-			List{port1, port1},
-			List{port2, port2},
-			true,
-		},
-		{
-			"proto differs",
-			List{port1, port1},
-			List{port2, portProto},
-			false,
-		},
-		{
-			"port differs",
-			List{port1, port1},
-			List{port2, portPort},
-			false,
-		},
-		{
-			"inode differs",
-			List{port1, port1},
-			List{port2, portInode},
-			false,
-		},
-		{
-			// SameInodes does not check the Process field
-			"Process differs",
-			List{port1, port1},
-			List{port2, portProcess},
-			true,
-		},
-	}
-	for _, tt := range tests {
-		got := tt.a.SameInodes(tt.b)
-		if got != tt.want {
-			t.Errorf("%s: Equal = %v; want %v", tt.name, got, tt.want)
-		}
-	}
-}
-
 func BenchmarkGetList(b *testing.B) {
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
--- a/safesocket/unixsocket.go
+++ b/safesocket/unixsocket.go
@@ -64,33 +64,10 @@ func listen(path string, port uint16) (ln net.Listener, _ uint16, err error) {
 	if err != nil {
 		return nil, 0, err
 	}
-	os.Chmod(path, socketPermissionsForOS())
+	os.Chmod(path, 0666)
 	return pipe, 0, err
 }

-// socketPermissionsForOS returns the permissions to use for the
-// tailscaled.sock.
-func socketPermissionsForOS() os.FileMode {
-	if runtime.GOOS == "linux" {
-		// On Linux, the ipn/ipnserver package looks at the Unix peer creds
-		// and only permits read-only actions from non-root users, so we want
-		// this opened up wider.
-		//
-		// TODO(bradfitz): unify this all one in place probably, moving some
-		// of ipnserver (which does much of the "safe" bits) here. Maybe
-		// instead of net.Listener, we should return a type that returns
-		// an identity in addition to a net.Conn? (returning a wrapped net.Conn
-		// would surprise downstream callers probably)
-		//
-		// TODO(bradfitz): if OpenBSD and FreeBSD do the equivalent peercreds
-		// stuff that's in ipn/ipnserver/conn_ucred.go, they should also
-		// return 0666 here.
-		return 0666
-	}
-	// Otherwise, root only.
-	return 0600
-}
-
 // connectMacOSAppSandbox connects to the Tailscale Network Extension,
 // which is necessarily running within the macOS App Sandbox.  Our
 // little dance to connect a regular user binary to the sandboxed
--- a/scripts/check_license_headers.sh
+++ b/scripts/check_license_headers.sh
@@ -10,7 +10,7 @@
 check_file() {
    got=$1

-    for year in `seq 2019 2021`; do
+    for year in `seq 2019 2020`; do
        want=$(cat <<EOF
 // Copyright (c) $year Tailscale Inc & AUTHORS All rights reserved.
 // Use of this source code is governed by a BSD-style
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -22,18 +22,6 @@ import (
 	"tailscale.com/types/structs"
 )

-// CurrentMapRequestVersion is the current MapRequest.Version value.
-//
-// History of versions:
-//     3: implicit compression, keep-alives
-//     4: opt-in keep-alives via KeepAlive field, opt-in compression via Compress
-//     5: 2020-10-19, implies IncludeIPv6, delta Peers/UserProfiles, supports MagicDNS
-//     6: 2020-12-07: means MapResponse.PacketFilter nil means unchanged
-//     7: 2020-12-15: FilterRule.SrcIPs accepts CIDRs+ranges, doesn't warn about 0.0.0.0/::
-//     8: 2020-12-19: client can receive IPv6 addresses and routes if beta enabled server-side
-//     9: 2020-12-30: client doesn't auto-add implicit search domains from peers; only DNSConfig.Domains
-const CurrentMapRequestVersion = 9
-
 type ID int64

 type UserID ID
@@ -147,17 +135,9 @@ type UserProfile struct {
 }

 type Node struct {
-	ID   NodeID
-	Name string // DNS
-
-	// User is the user who created the node. If ACL tags are in
-	// use for the node then it doesn't reflect the ACL identity
-	// that the node is running as.
-	User UserID
-
-	// Sharer, if non-zero, is the user who shared this node, if different than User.
-	Sharer UserID `json:",omitempty"`
-
+	ID         NodeID
+	Name       string // DNS
+	User       UserID
 	Key        NodeKey
 	KeyExpiry  time.Time
 	Machine    MachineKey
@@ -491,9 +471,14 @@ type MapRequest struct {
 	// we want to signal to the control server that we're capable of something
 	// different.
 	//
-	// For current values and history, see CurrentMapRequestVersion above.
-	Version int
-
+	// History of versions:
+	//     3: implicit compression, keep-alives
+	//     4: opt-in keep-alives via KeepAlive field, opt-in compression via Compress
+	//     5: 2020-10-19, implies IncludeIPv6, delta Peers/UserProfiles, supports MagicDNS
+	//     6: 2020-12-07: means MapResponse.PacketFilter nil means unchanged
+	//     7: 2020-12-15: FilterRule.SrcIPs accepts CIDRs+ranges, doesn't warn about 0.0.0.0/::
+	//     8: 2020-12-19: client can receive IPv6 addresses and routes if beta enabled server-side
+	Version     int
 	Compress    string // "zstd" or "" (no compression)
 	KeepAlive   bool   // whether server should send keep-alives back to us
 	NodeKey     NodeKey
@@ -531,6 +516,8 @@ type MapRequest struct {
 	// Current DebugFlags values are:
 	//     * "warn-ip-forwarding-off": client is trying to be a subnet
 	//       router but their IP forwarding is broken.
+	//     * "v6-overlay": IPv6 development flag to have control send
+	//       v6 node addrs
 	//     * "minimize-netmap": have control minimize the netmap, removing
 	//       peers that are unreachable per ACLS.
 	DebugFlags []string `json:",omitempty"`
@@ -578,7 +565,7 @@ type FilterRule struct {
 	// position is 32, as if the SrcIPs above were a /32 mask. For
 	// a "*" SrcIPs value, the corresponding SrcBits value is
 	// ignored.
-	SrcBits []int `json:",omitempty"`
+	SrcBits []int

 	// DstPorts are the port ranges to allow once a source IP
 	// matches (is in the CIDR described by SrcIPs & SrcBits).
@@ -640,20 +627,11 @@ type MapResponse struct {
 	//
 	// TODO(dmytro): should be sent in DNSConfig.Nameservers once clients have updated.
 	DNS []netaddr.IP `json:",omitempty"`
-
-	// SearchPaths is the old way to specify DNS search
-	// domains. Clients should use these values if set, but the
-	// server will omit this field for clients with
-	// MapRequest.Version >= 9. Clients should prefer to use
-	// DNSConfig.Domains instead.
-	SearchPaths []string `json:",omitempty"`
-
-	// DNSConfig contains the DNS settings for the client to use.
+	// SearchPaths are the same as DNSConfig.Domains.
 	//
-	// TODO(bradfitz): make this a pointer and conditionally sent
-	// only if changed, like DERPMap, PacketFilter, etc. It's
-	// small, though.
-	DNSConfig DNSConfig `json:",omitempty"`
+	// TODO(dmytro): should be sent in DNSConfig.Domains once clients have updated.
+	SearchPaths []string  `json:",omitempty"`
+	DNSConfig   DNSConfig `json:",omitempty"`

 	// Domain is the name of the network that this node is
 	// in. It's either of the form "example.com" (for user
@@ -663,12 +641,6 @@ type MapResponse struct {
 	// forms are coming later.
 	Domain string

-	// CollectServices reports whether this node's Tailnet has
-	// requested that info about services be included in HostInfo.
-	// If unset, the most recent non-empty MapResponse value in
-	// the HTTP response stream is used.
-	CollectServices opt.Bool `json:",omitempty"`
-
 	// PacketFilter are the firewall rules.
 	//
 	// For MapRequest.Version >= 6, a nil value means the most
@@ -781,7 +753,6 @@ func (n *Node) Equal(n2 *Node) bool {
 		n.ID == n2.ID &&
 		n.Name == n2.Name &&
 		n.User == n2.User &&
-		n.Sharer == n2.Sharer &&
 		n.Key == n2.Key &&
 		n.KeyExpiry.Equal(n2.KeyExpiry) &&
 		n.Machine == n2.Machine &&
--- a/tailcfg/tailcfg_clone.go
+++ b/tailcfg/tailcfg_clone.go
@@ -64,7 +64,6 @@ var _NodeNeedsRegeneration = Node(struct {
 	ID                NodeID
 	Name              string
 	User              UserID
-	Sharer            UserID
 	Key               NodeKey
 	KeyExpiry         time.Time
 	Machine           MachineKey
--- a/tailcfg/tailcfg_test.go
+++ b/tailcfg/tailcfg_test.go
@@ -188,12 +188,7 @@ func TestHostinfoEqual(t *testing.T) {
 }

 func TestNodeEqual(t *testing.T) {
-	nodeHandles := []string{
-		"ID", "Name", "User", "Sharer",
-		"Key", "KeyExpiry", "Machine", "DiscoKey",
-		"Addresses", "AllowedIPs", "Endpoints", "DERP", "Hostinfo",
-		"Created", "LastSeen", "KeepAlive", "MachineAuthorized",
-	}
+	nodeHandles := []string{"ID", "Name", "User", "Key", "KeyExpiry", "Machine", "DiscoKey", "Addresses", "AllowedIPs", "Endpoints", "DERP", "Hostinfo", "Created", "LastSeen", "KeepAlive", "MachineAuthorized"}
 	if have := fieldsOf(reflect.TypeOf(Node{})); !reflect.DeepEqual(have, nodeHandles) {
 		t.Errorf("Node.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
 			have, nodeHandles)
--- a/tstest/log.go
+++ b/tstest/log.go
@@ -75,18 +75,13 @@ type LogLineTracker struct {
 	logf      logger.Logf
 	listenFor []string

-	mu     sync.Mutex
-	closed bool
-	seen   map[string]bool // format string => false (if not yet seen but wanted) or true (once seen)
+	mu   sync.Mutex
+	seen map[string]bool // format string => false (if not yet seen but wanted) or true (once seen)
 }

 // Logf logs to its underlying logger and also tracks that the given format pattern has been seen.
 func (lt *LogLineTracker) Logf(format string, args ...interface{}) {
 	lt.mu.Lock()
-	if lt.closed {
-		lt.mu.Unlock()
-		return
-	}
 	if v, ok := lt.seen[format]; ok && !v {
 		lt.seen[format] = true
 	}
@@ -106,10 +101,3 @@ func (lt *LogLineTracker) Check() []string {
 	}
 	return notSeen
 }
-
-// Close closes lt. After calling Close, calls to Logf become no-ops.
-func (lt *LogLineTracker) Close() {
-	lt.mu.Lock()
-	defer lt.mu.Unlock()
-	lt.closed = true
-}
--- a/tsweb/tsweb.go
+++ b/tsweb/tsweb.go
@@ -43,7 +43,7 @@ func registerCommonDebug(mux *http.ServeMux) {
 	expvar.Publish("counter_uptime_sec", expvar.Func(func() interface{} { return int64(Uptime().Seconds()) }))
 	mux.Handle("/debug/pprof/", Protected(http.DefaultServeMux)) // to net/http/pprof
 	mux.Handle("/debug/vars", Protected(http.DefaultServeMux))   // to expvar
-	mux.Handle("/debug/varz", Protected(http.HandlerFunc(VarzHandler)))
+	mux.Handle("/debug/varz", Protected(http.HandlerFunc(varzHandler)))
 	mux.Handle("/debug/gc", Protected(http.HandlerFunc(gcHandler)))
 }

@@ -371,7 +371,7 @@ func Error(code int, msg string, err error) HTTPError {
 	return HTTPError{Code: code, Msg: msg, Err: err}
 }

-// VarzHandler is an HTTP handler to write expvar values into the
+// varzHandler is an HTTP handler to write expvar values into the
 // prometheus export format:
 //
 //   https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md
@@ -388,7 +388,7 @@ func Error(code int, msg string, err error) HTTPError {
 //     is not exported.
 //
 // This will evolve over time, or perhaps be replaced.
-func VarzHandler(w http.ResponseWriter, r *http.Request) {
+func varzHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "text/plain; version=0.0.4")

 	var dump func(prefix string, kv expvar.KeyValue)
--- a/types/key/key.go
+++ b/types/key/key.go
@@ -82,15 +82,6 @@ func (k Private) Public() Public {
 	return Public(pub)
 }

-func (k Private) SharedSecret(pub Public) (ss [32]byte) {
-	apk := (*[32]byte)(&pub)
-	ask := (*[32]byte)(&k)
-	//lint:ignore SA1019 Code copied from wireguard-go, we aim for
-	//minimal changes from it.
-	curve25519.ScalarMult(&ss, ask, apk)
-	return ss
-}
-
 // NewPublicFromHexMem parses a public key in its hex form, given in m.
 // The provided m must be exactly 64 bytes in length.
 func NewPublicFromHexMem(m mem.RO) (Public, error) {
--- a/types/logger/logger.go
+++ b/types/logger/logger.go
@@ -132,7 +132,7 @@ func RateLimitedFn(logf Logf, f time.Duration, burst int, maxCache int) Logf {
 			logf(format, args...)
 		case warn:
 			// For the warning, log the specific format string
-			logf("[RATE LIMITED] format string \"%s\" (example: \"%s\")", format, fmt.Sprintf(format, args...))
+			logf("[RATE LIMITED] format string \"%s\"", format)
 		}
 	}
 }
@@ -179,40 +179,3 @@ func (fn ArgWriter) Format(f fmt.State, _ rune) {
 }

 var argBufioPool = &sync.Pool{New: func() interface{} { return bufio.NewWriterSize(ioutil.Discard, 1024) }}
-
-// Filtered returns a Logf that silently swallows some log lines.
-// Each inbound format and args is evaluated and printed to a string s.
-// The original format and args are passed to logf if and only if allow(s) returns true.
-func Filtered(logf Logf, allow func(s string) bool) Logf {
-	return func(format string, args ...interface{}) {
-		msg := fmt.Sprintf(format, args...)
-		if !allow(msg) {
-			return
-		}
-		logf(format, args...)
-	}
-}
-
-// LogfCloser wraps logf to create a logger that can be closed.
-// Calling close makes all future calls to newLogf into no-ops.
-func LogfCloser(logf Logf) (newLogf Logf, close func()) {
-	var (
-		mu     sync.Mutex
-		closed bool
-	)
-	close = func() {
-		mu.Lock()
-		defer mu.Unlock()
-		closed = true
-	}
-	newLogf = func(msg string, args ...interface{}) {
-		mu.Lock()
-		if closed {
-			mu.Unlock()
-			return
-		}
-		mu.Unlock()
-		logf(msg, args...)
-	}
-	return newLogf, close
-}
--- a/types/logger/logger_test.go
+++ b/types/logger/logger_test.go
@@ -45,8 +45,8 @@ func TestRateLimiter(t *testing.T) {
 		"templated format string no. 0",
 		"boring string with constant formatting (constant)",
 		"templated format string no. 1",
-		"[RATE LIMITED] format string \"boring string with constant formatting %s\" (example: \"boring string with constant formatting (constant)\")",
-		"[RATE LIMITED] format string \"templated format string no. %d\" (example: \"templated format string no. 2\")",
+		"[RATE LIMITED] format string \"boring string with constant formatting %s\"",
+		"[RATE LIMITED] format string \"templated format string no. %d\"",
 		"Make sure this string makes it through the rest (that are blocked) 4",
 		"4 shouldn't get filtered.",
 	}
--- a/util/dnsname/dnsname.go
+++ b/util/dnsname/dnsname.go
@@ -1,19 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package dnsname contains string functions for working with DNS names.
-package dnsname
-
-import "strings"
-
-// HasSuffix reports whether the provided DNS name ends with the
-// component(s) in suffix, ignoring any trailing dots.
-//
-// If suffix is the empty string, HasSuffix always reports false.
-func HasSuffix(name, suffix string) bool {
-	name = strings.TrimSuffix(name, ".")
-	suffix = strings.TrimSuffix(suffix, ".")
-	nameBase := strings.TrimSuffix(name, suffix)
-	return len(nameBase) < len(name) && strings.HasSuffix(nameBase, ".")
-}
--- a/util/dnsname/dnsname_test.go
+++ b/util/dnsname/dnsname_test.go
@@ -1,28 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package dnsname
-
-import "testing"
-
-func TestHasSuffix(t *testing.T) {
-	tests := []struct {
-		name, suffix string
-		want         bool
-	}{
-		{"foo.com", "com", true},
-		{"foo.com.", "com", true},
-		{"foo.com.", "com.", true},
-
-		{"", "", false},
-		{"foo.com.", "", false},
-		{"foo.com.", "o.com", false},
-	}
-	for _, tt := range tests {
-		got := HasSuffix(tt.name, tt.suffix)
-		if got != tt.want {
-			t.Errorf("HasSuffix(%q, %q) = %v; want %v", tt.name, tt.suffix, got, tt.want)
-		}
-	}
-}
--- a/version/version.go
+++ b/version/version.go
@@ -10,7 +10,7 @@ package version
 // Long is a full version number for this build, of the form
 // "x.y.z-commithash", or "date.yyyymmdd" if no actual version was
 // provided.
-const Long = "date.20210104"
+const Long = "date.20201230"

 // Short is a short version number for this build, of the form
 // "x.y.z", or "date.yyyymmdd" if no actual version was provided.
--- a/wgengine/filter/filter.go
+++ b/wgengine/filter/filter.go
@@ -10,9 +10,9 @@ import (
 	"sync"
 	"time"

+	"github.com/golang/groupcache/lru"
 	"golang.org/x/time/rate"
 	"inet.af/netaddr"
-	"tailscale.com/net/flowtrack"
 	"tailscale.com/net/packet"
 	"tailscale.com/types/logger"
 )
@@ -39,14 +39,19 @@ type Filter struct {
 	// to an outbound connection that this node made, even if those
 	// incoming packets don't get accepted by matches above.
 	state *filterState
+}

-	shieldsUp bool
+// tuple is a 4-tuple of source and destination IP and port. It's used
+// as a lookup key in filterState.
+type tuple struct {
+	Src netaddr.IPPort
+	Dst netaddr.IPPort
 }

 // filterState is a state cache of past seen packets.
 type filterState struct {
 	mu  sync.Mutex
-	lru *flowtrack.Cache // from flowtrack.Tuple -> nil
+	lru *lru.Cache // of tuple
 }

 // lruMax is the size of the LRU cache in filterState.
@@ -56,18 +61,15 @@ const lruMax = 512
 type Response int

 const (
-	Drop         Response = iota // do not continue processing packet.
-	DropSilently                 // do not continue processing packet, but also don't log
-	Accept                       // continue processing packet.
-	noVerdict                    // no verdict yet, continue running filter
+	Drop      Response = iota // do not continue processing packet.
+	Accept                    // continue processing packet.
+	noVerdict                 // no verdict yet, continue running filter
 )

 func (r Response) String() string {
 	switch r {
 	case Drop:
 		return "Drop"
-	case DropSilently:
-		return "DropSilently"
 	case Accept:
 		return "Accept"
 	case noVerdict:
@@ -77,10 +79,6 @@ func (r Response) String() string {
 	}
 }

-func (r Response) IsDrop() bool {
-	return r == Drop || r == DropSilently
-}
-
 // RunFlags controls the filter's debug log verbosity at runtime.
 type RunFlags int

@@ -132,12 +130,6 @@ func NewAllowNone(logf logger.Logf) *Filter {
 	return New(nil, nil, nil, logf)
 }

-func NewShieldsUpFilter(logf logger.Logf) *Filter {
-	f := New(nil, nil, nil, logf)
-	f.shieldsUp = true
-	return f
-}
-
 // New creates a new packet filter. The filter enforces that incoming
 // packets must be destined to an IP in localNets, and must be allowed
 // by matches. If shareStateWith is non-nil, the returned filter
@@ -149,7 +141,7 @@ func New(matches []Match, localNets []netaddr.IPPrefix, shareStateWith *Filter,
 		state = shareStateWith.state
 	} else {
 		state = &filterState{
-			lru: &flowtrack.Cache{MaxEntries: lruMax},
+			lru: lru.New(lruMax),
 		}
 	}
 	f := &Filter{
@@ -268,10 +260,6 @@ func (f *Filter) CheckTCP(srcIP, dstIP netaddr.IP, dstPort uint16) Response {
 	return f.RunIn(pkt, 0)
 }

-// ShieldsUp reports whether this is a "shields up" (block everything
-// incoming) filter.
-func (f *Filter) ShieldsUp() bool { return f.shieldsUp }
-
 // RunIn determines whether this node is allowed to receive q from a
 // Tailscale peer.
 func (f *Filter) RunIn(q *packet.Parsed, rf RunFlags) Response {
@@ -346,7 +334,7 @@ func (f *Filter) runIn4(q *packet.Parsed) (r Response, why string) {
 			return Accept, "tcp ok"
 		}
 	case packet.UDP:
-		t := flowtrack.Tuple{Src: q.Src, Dst: q.Dst}
+		t := tuple{q.Src, q.Dst}

 		f.state.mu.Lock()
 		_, ok := f.state.lru.Get(t)
@@ -358,8 +346,6 @@ func (f *Filter) runIn4(q *packet.Parsed) (r Response, why string) {
 		if f.matches4.match(q) {
 			return Accept, "udp ok"
 		}
-	case packet.TSMP:
-		return Accept, "tsmp ok"
 	default:
 		return Drop, "Unknown proto"
 	}
@@ -403,7 +389,7 @@ func (f *Filter) runIn6(q *packet.Parsed) (r Response, why string) {
 			return Accept, "tcp ok"
 		}
 	case packet.UDP:
-		t := flowtrack.Tuple{Src: q.Src, Dst: q.Dst}
+		t := tuple{q.Src, q.Dst}

 		f.state.mu.Lock()
 		_, ok := f.state.lru.Get(t)
@@ -427,10 +413,10 @@ func (f *Filter) runOut(q *packet.Parsed) (r Response, why string) {
 		return Accept, "ok out"
 	}

-	tuple := flowtrack.Tuple{Src: q.Dst, Dst: q.Src} // src/dst reversed
-
+	t := tuple{q.Dst, q.Src}
+	var ti interface{} = t // allocate once, rather than twice inside mutex
 	f.state.mu.Lock()
-	f.state.lru.Add(tuple, nil)
+	f.state.lru.Add(ti, ti)
 	f.state.mu.Unlock()
 	return Accept, "ok out"
 }
--- a/wgengine/filter/filter_test.go
+++ b/wgengine/filter/filter_test.go
@@ -414,7 +414,7 @@ func raw6(proto packet.IPProto, src, dst string, sport, dport uint16, trimLen in

 	payload := make([]byte, 12)
 	// Set the right bit to look like a TCP SYN, if the packet ends up interpreted as TCP
-	payload[5] = byte(packet.TCPSyn)
+	payload[5] = packet.TCPSyn

 	b := packet.Generate(&u, payload) // payload large enough to possibly be TCP

@@ -443,7 +443,7 @@ func raw4(proto packet.IPProto, src, dst string, sport, dport uint16, trimLength

 	payload := make([]byte, 12)
 	// Set the right bit to look like a TCP SYN, if the packet ends up interpreted as TCP
-	payload[5] = byte(packet.TCPSyn)
+	payload[5] = packet.TCPSyn

 	b := packet.Generate(&u, payload) // payload large enough to possibly be TCP

--- a/wgengine/magicsock/legacy.go
+++ b/wgengine/magicsock/legacy.go
@@ -5,24 +5,17 @@
 package magicsock

 import (
-	"bytes"
-	"crypto/hmac"
-	"crypto/subtle"
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"hash"
 	"net"
 	"strings"
 	"sync"
 	"time"

 	"github.com/tailscale/wireguard-go/conn"
-	"github.com/tailscale/wireguard-go/tai64n"
+	"github.com/tailscale/wireguard-go/device"
 	"github.com/tailscale/wireguard-go/wgcfg"
-	"golang.org/x/crypto/blake2s"
-	"golang.org/x/crypto/chacha20poly1305"
-	"golang.org/x/crypto/poly1305"
 	"inet.af/netaddr"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/types/key"
@@ -30,16 +23,9 @@ import (
 	"tailscale.com/types/wgkey"
 )

-var (
-	errNoDestinations = errors.New("magicsock: no destinations")
-	errDisabled       = errors.New("magicsock: legacy networking disabled")
-)
+var errNoDestinations = errors.New("magicsock: no destinations")

 func (c *Conn) createLegacyEndpointLocked(pk key.Public, addrs string) (conn.Endpoint, error) {
-	if c.disableLegacy {
-		return nil, errDisabled
-	}
-
 	a := &addrSet{
 		Logf:      c.logf,
 		publicKey: pk,
@@ -84,62 +70,17 @@ func (c *Conn) createLegacyEndpointLocked(pk key.Public, addrs string) (conn.End
 	return a, nil
 }

-func (c *Conn) findLegacyEndpointLocked(ipp netaddr.IPPort, addr *net.UDPAddr, packet []byte) conn.Endpoint {
-	if c.disableLegacy {
-		return nil
-	}
-
+func (c *Conn) findLegacyEndpointLocked(ipp netaddr.IPPort, addr *net.UDPAddr) conn.Endpoint {
 	// Pre-disco: look up their addrSet.
 	if as, ok := c.addrsByUDP[ipp]; ok {
-		as.updateDst(addr)
 		return as
 	}

-	// We don't know who this peer is. It's possible that it's one of
-	// our legitimate peers and they've roamed to an address we don't
-	// know. If this is a handshake packet, we can try to identify the
-	// peer in question.
-	if as := c.peerFromPacketLocked(packet); as != nil {
-		as.updateDst(addr)
-		return as
-	}
-
-	// We have no idea who this is, drop the packet.
-	//
-	// In the past, when this magicsock implementation was the main
-	// one, we tried harder to find a match here: we would pass the
-	// packet into wireguard-go with a "singleEndpoint" implementation
-	// that wrapped the UDPAddr. Then, a patch we added to
-	// wireguard-go would call UpdateDst on that singleEndpoint after
-	// decrypting the packet and identifying the peer (if any),
-	// allowing us to update the relevant addrSet.
-	//
-	// This was a significant out of tree patch to wireguard-go, so we
-	// got rid of it, and instead switched to this logic you're
-	// reading now, which makes a best effort to identify sources for
-	// handshake packets (because they're relatively easy to turn into
-	// a peer public key statelessly), but otherwise drops packets
-	// that come from "roaming" addresses that aren't known to
-	// magicsock.
-	//
-	// The practical consequence of this is that some complex NAT
-	// traversal cases will now fail between a very old Tailscale
-	// client (0.96 and earlier) and a very new Tailscale
-	// client. However, those scenarios were likely also failing on
-	// all-old clients, because the probabilistic NAT opening didn't
-	// work reliably. So, in practice, this simplification means
-	// connectivity looks like this:
-	//
-	//  - old+old client: unchanged
-	//  - old+new client (easy network topology): unchanged
-	//  - old+new client (hard network topology): was bad, now a bit worse
-	//  - new+new client: unchanged
-	//
-	// This degradation is acceptable in that it continues to support
-	// the incremental upgrade of old clients that currently work
-	// well, which is our primary goal for the <100 clients still left
-	// on the oldest pre-DERP versions (as of 2021-01-12).
-	return nil
+	// Pre-disco: the peer that sent this packet has roamed beyond
+	// the knowledge provided by the control server.  If the
+	// packet is valid wireguard will call UpdateDst on the
+	// original endpoint using this addr.
+	return (*singleEndpoint)(addr)
 }

 func (c *Conn) resetAddrSetStatesLocked() {
@@ -149,11 +90,17 @@ func (c *Conn) resetAddrSetStatesLocked() {
 	}
 }

-func (c *Conn) sendAddrSet(b []byte, as *addrSet) error {
-	if c.disableLegacy {
-		return errDisabled
+func (c *Conn) sendSingleEndpoint(b []byte, se *singleEndpoint) error {
+	addr := (*net.UDPAddr)(se)
+	if addr.IP.Equal(derpMagicIP) {
+		c.logf("magicsock: [unexpected] DERP BUG: attempting to send packet to DERP address %v", addr)
+		return nil
 	}
+	_, err := c.sendUDPStd(addr, b)
+	return err
+}

+func (c *Conn) sendAddrSet(b []byte, as *addrSet) error {
 	var addrBuf [8]netaddr.IPPort
 	dsts, roamAddr := as.appendDests(addrBuf[:0], b)

@@ -182,71 +129,15 @@ func (c *Conn) sendAddrSet(b []byte, as *addrSet) error {
 	return ret
 }

-// peerFromPacketLocked extracts returns the addrSet for the peer who sent
-// packet, if derivable.
-//
-// The derived addrSet is a hint, not a cryptographically strong
-// assertion. The returned value MUST NOT be used for any security
-// critical function. Callers MUST assume that the addrset can be
-// picked by a remote attacker.
-func (c *Conn) peerFromPacketLocked(packet []byte) *addrSet {
-	if len(packet) < 4 {
-		return nil
-	}
-	msgType := binary.LittleEndian.Uint32(packet[:4])
-	if msgType != messageInitiationType {
-		// Can't get peer out of a non-handshake packet.
-		return nil
-	}
-
-	var msg messageInitiation
-	reader := bytes.NewReader(packet)
-	err := binary.Read(reader, binary.LittleEndian, &msg)
-	if err != nil {
-		return nil
-	}
-
-	// Process just enough of the handshake to extract the long-term
-	// peer public key. We don't verify the handshake all the way, so
-	// this may be a spoofed packet. The extracted peer MUST NOT be
-	// used for any security critical function. In our case, we use it
-	// as a hint for roaming addresses.
-	var (
-		pub      = c.privateKey.Public()
-		hash     [blake2s.Size]byte
-		chainKey [blake2s.Size]byte
-		peerPK   key.Public
-		boxKey   [chacha20poly1305.KeySize]byte
-	)
-
-	mixHash(&hash, &initialHash, pub[:])
-	mixHash(&hash, &hash, msg.Ephemeral[:])
-	mixKey(&chainKey, &initialChainKey, msg.Ephemeral[:])
-
-	ss := c.privateKey.SharedSecret(key.Public(msg.Ephemeral))
-	if isZero(ss[:]) {
-		return nil
-	}
-
-	kdf2(&chainKey, &boxKey, chainKey[:], ss[:])
-	aead, _ := chacha20poly1305.New(boxKey[:])
-	_, err = aead.Open(peerPK[:0], zeroNonce[:], msg.Static[:], hash[:])
-	if err != nil {
-		return nil
-	}
-
-	return c.addrsByKey[peerPK]
-}
-
 func shouldSprayPacket(b []byte) bool {
 	if len(b) < 4 {
 		return false
 	}
 	msgType := binary.LittleEndian.Uint32(b[:4])
 	switch msgType {
-	case messageInitiationType,
-		messageResponseType,
-		messageCookieReplyType: // TODO: necessary?
+	case device.MessageInitiationType,
+		device.MessageResponseType,
+		device.MessageCookieReplyType: // TODO: necessary?
 		return true
 	}
 	return false
@@ -434,6 +325,19 @@ func (a *addrSet) dst() netaddr.IPPort {
 	return a.ipPorts[i]
 }

+// packUDPAddr packs a UDPAddr in the form wanted by WireGuard.
+func packUDPAddr(ua *net.UDPAddr) []byte {
+	ip := ua.IP.To4()
+	if ip == nil {
+		ip = ua.IP
+	}
+	b := make([]byte, 0, len(ip)+2)
+	b = append(b, ip...)
+	b = append(b, byte(ua.Port))
+	b = append(b, byte(ua.Port>>8))
+	return b
+}
+
 func (a *addrSet) DstToBytes() []byte {
 	return packIPPort(a.dst())
 }
@@ -448,9 +352,7 @@ func (a *addrSet) SrcIP() net.IP       { return nil }
 func (a *addrSet) SrcToString() string { return "" }
 func (a *addrSet) ClearSrc()           {}

-// updateDst records receipt of a packet from new. This is used to
-// potentially update the transmit address used for this addrSet.
-func (a *addrSet) updateDst(new *net.UDPAddr) error {
+func (a *addrSet) UpdateDst(new *net.UDPAddr) error {
 	if new.IP.Equal(derpMagicIP) {
 		// Never consider DERP addresses as a viable candidate for
 		// either curAddr or roamAddr. It's only ever a last resort
@@ -578,103 +480,43 @@ func (as *addrSet) populatePeerStatus(ps *ipnstate.PeerStatus) {
 	}
 }

-func (a *addrSet) Addrs() string {
-	var addrs []string
+func (a *addrSet) Addrs() []wgcfg.Endpoint {
+	var eps []wgcfg.Endpoint
 	for _, addr := range a.addrs {
-		addrs = append(addrs, addr.String())
+		eps = append(eps, wgcfg.Endpoint{
+			Host: addr.IP.String(),
+			Port: uint16(addr.Port),
+		})
 	}

 	a.mu.Lock()
 	defer a.mu.Unlock()
 	if a.roamAddr != nil {
-		addrs = append(addrs, a.roamAddr.String())
+		eps = append(eps, wgcfg.Endpoint{
+			Host: a.roamAddr.IP.String(),
+			Port: uint16(a.roamAddr.Port),
+		})
 	}
-	return strings.Join(addrs, ",")
+	return eps
 }

-// Message types copied from wireguard-go/device/noise-protocol.go
-const (
-	messageInitiationType  = 1
-	messageResponseType    = 2
-	messageCookieReplyType = 3
-)
+// singleEndpoint is a wireguard-go/conn.Endpoint used for "roaming
+// addressed" in releases of Tailscale that predate discovery
+// messages. New peers use discoEndpoint.
+type singleEndpoint net.UDPAddr

-// Cryptographic constants copied from wireguard-go/device/noise-protocol.go
-var (
-	noiseConstruction = "Noise_IKpsk2_25519_ChaChaPoly_BLAKE2s"
-	wgIdentifier      = "WireGuard v1 zx2c4 Jason@zx2c4.com"
-	initialChainKey   [blake2s.Size]byte
-	initialHash       [blake2s.Size]byte
-	zeroNonce         [chacha20poly1305.NonceSize]byte
-)
-
-func init() {
-	initialChainKey = blake2s.Sum256([]byte(noiseConstruction))
-	mixHash(&initialHash, &initialChainKey, []byte(wgIdentifier))
+func (e *singleEndpoint) ClearSrc()           {}
+func (e *singleEndpoint) DstIP() net.IP       { return (*net.UDPAddr)(e).IP }
+func (e *singleEndpoint) SrcIP() net.IP       { return nil }
+func (e *singleEndpoint) SrcToString() string { return "" }
+func (e *singleEndpoint) DstToString() string { return (*net.UDPAddr)(e).String() }
+func (e *singleEndpoint) DstToBytes() []byte  { return packUDPAddr((*net.UDPAddr)(e)) }
+func (e *singleEndpoint) UpdateDst(dst *net.UDPAddr) error {
+	return fmt.Errorf("magicsock.singleEndpoint(%s).UpdateDst(%s): should never be called", (*net.UDPAddr)(e), dst)
 }
-
-// messageInitiation is the same as wireguard-go's MessageInitiation,
-// from wireguard-go/device/noise-protocol.go.
-type messageInitiation struct {
-	Type      uint32
-	Sender    uint32
-	Ephemeral wgcfg.Key
-	Static    [wgcfg.KeySize + poly1305.TagSize]byte
-	Timestamp [tai64n.TimestampSize + poly1305.TagSize]byte
-	MAC1      [blake2s.Size128]byte
-	MAC2      [blake2s.Size128]byte
-}
-
-func mixKey(dst *[blake2s.Size]byte, c *[blake2s.Size]byte, data []byte) {
-	kdf1(dst, c[:], data)
-}
-
-func mixHash(dst *[blake2s.Size]byte, h *[blake2s.Size]byte, data []byte) {
-	hash, _ := blake2s.New256(nil)
-	hash.Write(h[:])
-	hash.Write(data)
-	hash.Sum(dst[:0])
-	hash.Reset()
-}
-
-func hmac1(sum *[blake2s.Size]byte, key, in0 []byte) {
-	mac := hmac.New(func() hash.Hash {
-		h, _ := blake2s.New256(nil)
-		return h
-	}, key)
-	mac.Write(in0)
-	mac.Sum(sum[:0])
-}
-
-func hmac2(sum *[blake2s.Size]byte, key, in0, in1 []byte) {
-	mac := hmac.New(func() hash.Hash {
-		h, _ := blake2s.New256(nil)
-		return h
-	}, key)
-	mac.Write(in0)
-	mac.Write(in1)
-	mac.Sum(sum[:0])
-}
-
-func kdf1(t0 *[blake2s.Size]byte, key, input []byte) {
-	hmac1(t0, key, input)
-	hmac1(t0, t0[:], []byte{0x1})
-}
-
-func kdf2(t0, t1 *[blake2s.Size]byte, key, input []byte) {
-	var prk [blake2s.Size]byte
-	hmac1(&prk, key, input)
-	hmac1(t0, prk[:], []byte{0x1})
-	hmac2(t1, prk[:], t0[:], []byte{0x2})
-	for i := range prk[:] {
-		prk[i] = 0
-	}
-}
-
-func isZero(val []byte) bool {
-	acc := 1
-	for _, b := range val {
-		acc &= subtle.ConstantTimeByteEq(b, 0)
-	}
-	return acc == 1
+func (e *singleEndpoint) Addrs() []wgcfg.Endpoint {
+	return []wgcfg.Endpoint{{
+		Host: e.IP.String(),
+		Port: uint16(e.Port),
+	}}
 }
--- a/wgengine/magicsock/magicsock.go
+++ b/wgengine/magicsock/magicsock.go
@@ -27,7 +27,9 @@ import (
 	"syscall"
 	"time"

+	"github.com/golang/groupcache/lru"
 	"github.com/tailscale/wireguard-go/conn"
+	"github.com/tailscale/wireguard-go/wgcfg"
 	"go4.org/mem"
 	"golang.org/x/crypto/nacl/box"
 	"golang.org/x/time/rate"
@@ -49,6 +51,7 @@ import (
 	"tailscale.com/types/logger"
 	"tailscale.com/types/nettype"
 	"tailscale.com/types/opt"
+	"tailscale.com/types/structs"
 	"tailscale.com/types/wgkey"
 	"tailscale.com/version"
 )
@@ -118,7 +121,6 @@ type Conn struct {
 	packetListener   nettype.PacketListener
 	noteRecvActivity func(tailcfg.DiscoKey) // or nil, see Options.NoteRecvActivity
 	simulatedNetwork bool
-	disableLegacy    bool

 	// ================================================================
 	// No locking required to access these fields, either because
@@ -127,7 +129,6 @@ type Conn struct {

 	connCtx       context.Context // closed on Conn.Close
 	connCtxCancel func()          // closes connCtx
-	donec         <-chan struct{} // connCtx.Done()'s to avoid context.cancelCtx.Done()'s mutex per call

 	// pconn4 and pconn6 are the underlying UDP sockets used to
 	// send/receive packets for wireguard and other magicsock
@@ -146,21 +147,21 @@ type Conn struct {
 	// TODO(danderson): now that we have global rate-limiting, is this still useful?
 	sendLogLimit *rate.Limiter

+	// bufferedIPv4From and bufferedIPv4Packet are owned by
+	// ReceiveIPv4, and used when both a DERP and IPv4 packet arrive
+	// at the same time. It stores the IPv4 packet for use in the next call.
+	bufferedIPv4From   netaddr.IPPort // if non-zero, then bufferedIPv4Packet is valid
+	bufferedIPv4Packet []byte         // the received packet (reused, owned by ReceiveIPv4)
+
 	// stunReceiveFunc holds the current STUN packet processing func.
 	// Its Loaded value is always non-nil.
 	stunReceiveFunc atomic.Value // of func(p []byte, fromAddr *net.UDPAddr)

-	// derpRecvCh is used by ReceiveIPv4 to read DERP messages.
+	// udpRecvCh and derpRecvCh are used by ReceiveIPv4 to multiplex
+	// reads from DERP and the pconn4.
+	udpRecvCh  chan udpReadResult
 	derpRecvCh chan derpReadResult

-	// derpRecvCountAtomic is atomically incremented by runDerpReader whenever
-	// a DERP message arrives. It's incremented before runDerpReader is interrupted.
-	derpRecvCountAtomic int64
-	// derpRecvCountLast is used by ReceiveIPv4 to compare against
-	// its last read value of derpRecvCountAtomic to determine
-	// whether a DERP channel read should be done.
-	derpRecvCountLast int64 // owned by ReceiveIPv4
-
 	// ============================================================
 	mu     sync.Mutex // guards all following fields; see userspaceEngine lock ordering rules
 	muCond *sync.Cond
@@ -383,11 +384,6 @@ type Options struct {
 	// triggering macOS and Windows firwall dialog boxes during
 	// "go test").
 	SimulatedNetwork bool
-
-	// DisableLegacyNetworking disables legacy peer handling. When
-	// enabled, only active discovery-aware nodes will be able to
-	// communicate with Conn.
-	DisableLegacyNetworking bool
 }

 func (o *Options) logf() logger.Logf {
@@ -415,11 +411,11 @@ func (o *Options) derpActiveFunc() func() {
 // of NewConn. Mostly for tests.
 func newConn() *Conn {
 	c := &Conn{
-		disableLegacy:   true,
 		sendLogLimit:    rate.NewLimiter(rate.Every(1*time.Minute), 1),
 		addrsByUDP:      make(map[netaddr.IPPort]*addrSet),
 		addrsByKey:      make(map[key.Public]*addrSet),
 		derpRecvCh:      make(chan derpReadResult),
+		udpRecvCh:       make(chan udpReadResult),
 		derpStarted:     make(chan struct{}),
 		peerLastDerp:    make(map[key.Public]int),
 		endpointOfDisco: make(map[tailcfg.DiscoKey]*discoEndpoint),
@@ -446,14 +442,12 @@ func NewConn(opts Options) (*Conn, error) {
 	c.packetListener = opts.PacketListener
 	c.noteRecvActivity = opts.NoteRecvActivity
 	c.simulatedNetwork = opts.SimulatedNetwork
-	c.disableLegacy = opts.DisableLegacyNetworking

 	if err := c.initialBind(); err != nil {
 		return nil, err
 	}

 	c.connCtx, c.connCtxCancel = context.WithCancel(context.Background())
-	c.donec = c.connCtx.Done()
 	c.netChecker = &netcheck.Client{
 		Logf:                logger.WithPrefix(c.logf, "netcheck: "),
 		GetSTUNConn4:        func() netcheck.STUNConn { return c.pconn4 },
@@ -486,6 +480,8 @@ func (c *Conn) Start() {
 	go c.periodicDerpCleanup()
 }

+func (c *Conn) donec() <-chan struct{} { return c.connCtx.Done() }
+
 // ignoreSTUNPackets sets a STUN packet processing func that does nothing.
 func (c *Conn) ignoreSTUNPackets() {
 	c.stunReceiveFunc.Store(func([]byte, netaddr.IPPort) {})
@@ -687,16 +683,6 @@ func (c *Conn) callNetInfoCallback(ni *tailcfg.NetInfo) {
 	}
 }

-// addValidDiscoPathForTest makes addr a validated disco address for
-// discoKey. It's used in tests to enable receiving of packets from
-// addr without having to spin up the entire active discovery
-// machinery.
-func (c *Conn) addValidDiscoPathForTest(discoKey tailcfg.DiscoKey, addr netaddr.IPPort) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.discoOfAddr[addr] = discoKey
-}
-
 func (c *Conn) SetNetInfoCallback(fn func(*tailcfg.NetInfo)) {
 	if fn == nil {
 		panic("nil NetInfoCallback")
@@ -725,46 +711,14 @@ func peerForIP(nm *controlclient.NetworkMap, ip netaddr.IP) (n *tailcfg.Node, ok
 			}
 		}
 	}
-
-	// TODO(bradfitz): this is O(n peers). Add ART to netaddr?
-	var best netaddr.IPPrefix
 	for _, p := range nm.Peers {
 		for _, cidr := range p.AllowedIPs {
 			if cidr.Contains(ip) {
-				if best.IsZero() || cidr.Bits > best.Bits {
-					n = p
-					best = cidr
-				}
+				return p, true
 			}
 		}
 	}
-	return n, n != nil
-}
-
-// PeerForIP returns the node that ip should route to.
-func (c *Conn) PeerForIP(ip netaddr.IP) (n *tailcfg.Node, ok bool) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	if c.netMap == nil {
-		return
-	}
-	return peerForIP(c.netMap, ip)
-}
-
-// LastRecvActivityOfDisco returns the time we last got traffic from
-// this endpoint (updated every ~10 seconds).
-func (c *Conn) LastRecvActivityOfDisco(dk tailcfg.DiscoKey) time.Time {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	de, ok := c.endpointOfDisco[dk]
-	if !ok {
-		return time.Time{}
-	}
-	unix := atomic.LoadInt64(&de.lastRecvUnixAtomic)
-	if unix == 0 {
-		return time.Time{}
-	}
-	return time.Unix(unix, 0)
+	return nil, false
 }

 // Ping handles a "tailscale ping" CLI query.
@@ -1023,6 +977,8 @@ func (c *Conn) Send(b []byte, ep conn.Endpoint) error {
 		panic(fmt.Sprintf("[unexpected] Endpoint type %T", v))
 	case *discoEndpoint:
 		return v.send(b)
+	case *singleEndpoint:
+		return c.sendSingleEndpoint(b, v)
 	case *addrSet:
 		return c.sendAddrSet(b, v)
 	}
@@ -1097,7 +1053,7 @@ func (c *Conn) sendAddr(addr netaddr.IPPort, pubKey key.Public, b []byte) (sent
 	copy(pkt, b)

 	select {
-	case <-c.donec:
+	case <-c.donec():
 		return false, errConnClosed
 	case ch <- derpWriteRequest{addr, pubKey, pkt}:
 		return true, nil
@@ -1183,7 +1139,7 @@ func (c *Conn) derpWriteChanOfAddr(addr netaddr.IPPort, peer key.Public) chan<-
 		return nil
 	}

-	// Note that derphttp.NewRegionClient does not dial the server
+	// Note that derphttp.NewClient does not dial the server
 	// so it is safe to do under the mu lock.
 	dc := derphttp.NewRegionClient(c.privateKey, c.logf, func() *tailcfg.DERPRegion {
 		if c.connCtx.Err() != nil {
@@ -1377,16 +1333,7 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netaddr.IPPort, d
 			// Ignore.
 			// TODO: handle endpoint notification messages.
 			continue
-
 		}
-		// Before we wake up ReceiveIPv4 with SetReadDeadline,
-		// note that a DERP packet has arrived.  ReceiveIPv4
-		// will read this field to note that its UDP read
-		// error is due to us.
-		atomic.AddInt64(&c.derpRecvCountAtomic, 1)
-		// Cancel the pconn read goroutine.
-		c.pconn4.SetReadDeadline(aLongTimeAgo)
-
 		select {
 		case <-ctx.Done():
 			return
@@ -1440,7 +1387,7 @@ func (c *Conn) runDerpWriter(ctx context.Context, dc *derphttp.Client, ch <-chan
 // Endpoint to find the UDPAddr to return to wireguard anyway, so no
 // benefit unless we can, say, always return the same fake UDPAddr for
 // all packets.
-func (c *Conn) findEndpoint(ipp netaddr.IPPort, addr *net.UDPAddr, packet []byte) conn.Endpoint {
+func (c *Conn) findEndpoint(ipp netaddr.IPPort, addr *net.UDPAddr) conn.Endpoint {
 	c.mu.Lock()
 	defer c.mu.Unlock()

@@ -1452,16 +1399,71 @@ func (c *Conn) findEndpoint(ipp netaddr.IPPort, addr *net.UDPAddr, packet []byte
 		}
 	}

-	if addr == nil {
-		addr = ipp.UDPAddr()
-	}
-	return c.findLegacyEndpointLocked(ipp, addr, packet)
+	return c.findLegacyEndpointLocked(ipp, addr)
+}
+
+type udpReadResult struct {
+	_    structs.Incomparable
+	n    int
+	err  error
+	addr *net.UDPAddr
+	ipp  netaddr.IPPort
 }

 // aLongTimeAgo is a non-zero time, far in the past, used for
 // immediate cancellation of network operations.
 var aLongTimeAgo = time.Unix(233431200, 0)

+// awaitUDP4 reads a single IPv4 UDP packet (or an error) and sends it
+// to c.udpRecvCh, skipping over (but handling) any STUN replies.
+func (c *Conn) awaitUDP4(b []byte) {
+	for {
+		n, pAddr, err := c.pconn4.ReadFrom(b)
+		if err != nil {
+			select {
+			case c.udpRecvCh <- udpReadResult{err: err}:
+			case <-c.donec():
+			}
+			return
+		}
+		addr := pAddr.(*net.UDPAddr)
+		ipp, ok := c.pconn4.ippCache.IPPort(addr)
+		if !ok {
+			continue
+		}
+		if stun.Is(b[:n]) {
+			c.stunReceiveFunc.Load().(func([]byte, netaddr.IPPort))(b[:n], ipp)
+			continue
+		}
+		if c.handleDiscoMessage(b[:n], ipp) {
+			continue
+		}
+
+		select {
+		case c.udpRecvCh <- udpReadResult{n: n, addr: addr, ipp: ipp}:
+		case <-c.donec():
+		}
+		return
+	}
+}
+
+// wgRecvAddr returns the net.UDPAddr we tell wireguard-go the address
+// from which we received a packet for an endpoint.
+//
+// ipp is required. addr can be optionally provided.
+func wgRecvAddr(e conn.Endpoint, ipp netaddr.IPPort, addr *net.UDPAddr) *net.UDPAddr {
+	if ipp == (netaddr.IPPort{}) {
+		panic("zero ipp")
+	}
+	if de, ok := e.(*discoEndpoint); ok {
+		return de.fakeWGAddrStd
+	}
+	if addr != nil {
+		return addr
+	}
+	return ipp.UDPAddr()
+}
+
 // noteRecvActivityFromEndpoint calls the c.noteRecvActivity hook if
 // e is a discovery-capable peer and this is the first receive activity
 // it's got in awhile (in last 10 seconds).
@@ -1474,89 +1476,121 @@ func (c *Conn) noteRecvActivityFromEndpoint(e conn.Endpoint) {
 	}
 }

-func (c *Conn) ReceiveIPv6(b []byte) (int, conn.Endpoint, error) {
-	if c.pconn6 == nil {
-		return 0, nil, syscall.EAFNOSUPPORT
+func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, addr *net.UDPAddr, err error) {
+Top:
+	// First, process any buffered packet from earlier.
+	if from := c.bufferedIPv4From; from != (netaddr.IPPort{}) {
+		c.bufferedIPv4From = netaddr.IPPort{}
+		addr = from.UDPAddr()
+		ep := c.findEndpoint(from, addr)
+		c.noteRecvActivityFromEndpoint(ep)
+		return copy(b, c.bufferedIPv4Packet), ep, wgRecvAddr(ep, from, addr), nil
 	}
-	for {
-		n, pAddr, err := c.pconn6.ReadFrom(b)
-		if err != nil {
-			return 0, nil, err
-		}
-		if ep, ok := c.receiveIP(b[:n], pAddr.(*net.UDPAddr)); ok {
-			return n, ep, nil
-		}
-	}
-}

-func (c *Conn) derpPacketArrived() bool {
-	rc := atomic.LoadInt64(&c.derpRecvCountAtomic)
-	if rc != c.derpRecvCountLast {
-		c.derpRecvCountLast = rc
-		return true
-	}
-	return false
-}
+	go c.awaitUDP4(b)

-// ReceiveIPv4 is called by wireguard-go to receive an IPv4 packet.
-// In Tailscale's case, that packet might also arrive via DERP. A DERP packet arrival
-// aborts the pconn4 read deadline to make it fail.
-func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
-	for {
-		n, pAddr, err := c.pconn4.ReadFrom(b)
-		if err != nil {
-			// If the pconn4 read failed, the likely reason is a DERP reader received
-			// a packet and interrupted us.
-			// It's possible for ReadFrom to return a non deadline exceeded error
-			// and for there to have also had a DERP packet arrive, but that's fine:
-			// we'll get the same error from ReadFrom later.
-			if c.derpPacketArrived() {
-				c.pconn4.SetReadDeadline(time.Time{}) // restore
-				n, ep, err = c.receiveIPv4DERP(b)
-				if err == errLoopAgain {
-					continue
-				}
-				return n, ep, err
-			}
-			return 0, nil, err
-		}
-		if ep, ok := c.receiveIP(b[:n], pAddr.(*net.UDPAddr)); ok {
-			return n, ep, nil
-		}
-	}
-}
+	// Once the above goroutine has started, it owns b until it writes
+	// to udpRecvCh. The code below must not access b until it's
+	// completed a successful receive on udpRecvCh.

-// receiveIP is the shared bits of ReceiveIPv4 and ReceiveIPv6.
-func (c *Conn) receiveIP(b []byte, ua *net.UDPAddr) (ep conn.Endpoint, ok bool) {
-	ipp, ok := netaddr.FromStdAddr(ua.IP, ua.Port, ua.Zone)
-	if !ok {
-		return
-	}
-	if stun.Is(b) {
-		c.stunReceiveFunc.Load().(func([]byte, netaddr.IPPort))(b, ipp)
-		return
-	}
-	if c.handleDiscoMessage(b, ipp) {
-		return
-	}
-	ep = c.findEndpoint(ipp, ua, b)
-	if ep == nil {
-		return
-	}
-	c.noteRecvActivityFromEndpoint(ep)
-	return ep, true
-}
+	var ipp netaddr.IPPort

-var errLoopAgain = errors.New("received packet was not a wireguard-go packet or no endpoint found")
-
-// receiveIPv4DERP reads a packet from c.derpRecvCh into b and returns the associated endpoint.
-//
-// If the packet was a disco message or the peer endpoint wasn't
-// found, the returned error is errLoopAgain.
-func (c *Conn) receiveIPv4DERP(b []byte) (n int, ep conn.Endpoint, err error) {
-	var dm derpReadResult
 	select {
-	case <-c.donec:
+	case dm := <-c.derpRecvCh:
+		// Cancel the pconn read goroutine
+		c.pconn4.SetReadDeadline(aLongTimeAgo)
+		// Wait for the UDP-reading goroutine to be done, since it's currently
+		// the owner of the b []byte buffer:
+		select {
+		case um := <-c.udpRecvCh:
+			if um.err != nil {
+				// The normal case. The SetReadDeadline interrupted
+				// the read and we get an error which we now ignore.
+			} else {
+				// The pconn.ReadFrom succeeded and was about to send,
+				// but DERP sent first. So now we have both ready.
+				// Save the UDP packet away for use by the next
+				// ReceiveIPv4 call.
+				c.bufferedIPv4From = um.ipp
+				c.bufferedIPv4Packet = append(c.bufferedIPv4Packet[:0], b[:um.n]...)
+			}
+			c.pconn4.SetReadDeadline(time.Time{})
+		case <-c.donec():
+			return 0, nil, nil, errors.New("Conn closed")
+		}
+		var regionID int
+		n, regionID = dm.n, dm.regionID
+		ncopy := dm.copyBuf(b)
+		if ncopy != n {
+			err = fmt.Errorf("received DERP packet of length %d that's too big for WireGuard ReceiveIPv4 buf size %d", n, ncopy)
+			c.logf("magicsock: %v", err)
+			return 0, nil, nil, err
+		}
+
+		ipp = netaddr.IPPort{IP: derpMagicIPAddr, Port: uint16(regionID)}
+		if c.handleDiscoMessage(b[:n], ipp) {
+			goto Top
+		}
+
+		var (
+			didNoteRecvActivity bool
+			discoEp             *discoEndpoint
+			asEp                *addrSet
+		)
+		c.mu.Lock()
+		if dk, ok := c.discoOfNode[tailcfg.NodeKey(dm.src)]; ok {
+			discoEp = c.endpointOfDisco[dk]
+			// If we know about the node (it's in discoOfNode) but don't know about the
+			// endpoint, that's because it's an idle peer that doesn't yet exist in the
+			// wireguard config. So run the receive hook, if defined, which should
+			// create the wireguard peer.
+			if discoEp == nil && c.noteRecvActivity != nil {
+				didNoteRecvActivity = true
+				c.mu.Unlock()          // release lock before calling noteRecvActivity
+				c.noteRecvActivity(dk) // (calls back into CreateEndpoint)
+				// Now require the lock. No invariants need to be rechecked; just
+				// 1-2 map lookups follow that are harmless if, say, the peer has
+				// been deleted during this time.  In that case we'll treate it as a
+				// legacy pre-disco UDP receive and hand it to wireguard which'll
+				// likely just drop it.
+				c.mu.Lock()
+
+				discoEp = c.endpointOfDisco[dk]
+				c.logf("magicsock: DERP packet received from idle peer %v; created=%v", dm.src.ShortString(), ep != nil)
+			}
+		}
+		asEp = c.addrsByKey[dm.src]
+		c.mu.Unlock()
+
+		if discoEp != nil {
+			ep = discoEp
+		} else if asEp != nil {
+			ep = asEp
+		} else {
+			key := wgkey.Key(dm.src)
+			c.logf("magicsock: DERP packet from unknown key: %s", key.ShortString())
+			// TODO(danderson): after we fail to find a DERP endpoint, we
+			// seem to be falling through to passing the packet to
+			// wireguard with a garbage singleEndpoint. This feels wrong,
+			// should we goto Top above?
+			ep = c.findEndpoint(ipp, addr)
+		}
+
+		if !didNoteRecvActivity {
+			c.noteRecvActivityFromEndpoint(ep)
+		}
+		return n, ep, wgRecvAddr(ep, ipp, addr), nil
+
+	case um := <-c.udpRecvCh:
+		if um.err != nil {
+			return 0, nil, nil, err
+		}
+		n, addr, ipp = um.n, um.addr, um.ipp
+		ep = c.findEndpoint(ipp, addr)
+		c.noteRecvActivityFromEndpoint(ep)
+		return n, ep, wgRecvAddr(ep, ipp, addr), nil
+
+	case <-c.donec():
 		// Socket has been shut down. All the producers of packets
 		// respond to the context cancellation and go away, so we have
 		// to also unblock and return an error, to inform wireguard-go
@@ -1567,72 +1601,36 @@ func (c *Conn) receiveIPv4DERP(b []byte) (n int, ep conn.Endpoint, err error) {
 		// unblocks any concurrent Read()s. wireguard-go itself calls
 		// Clos() on magicsock, and expects ReceiveIPv4 to unblock
 		// with an error so it can clean up.
-		return 0, nil, errors.New("socket closed")
-	case dm = <-c.derpRecvCh:
-		// Below.
+		return 0, nil, nil, errors.New("socket closed")
 	}
+}

-	var regionID int
-	n, regionID = dm.n, dm.regionID
-	ncopy := dm.copyBuf(b)
-	if ncopy != n {
-		err = fmt.Errorf("received DERP packet of length %d that's too big for WireGuard ReceiveIPv4 buf size %d", n, ncopy)
-		c.logf("magicsock: %v", err)
-		return 0, nil, err
+func (c *Conn) ReceiveIPv6(b []byte) (int, conn.Endpoint, *net.UDPAddr, error) {
+	if c.pconn6 == nil {
+		return 0, nil, nil, syscall.EAFNOSUPPORT
 	}
-
-	ipp := netaddr.IPPort{IP: derpMagicIPAddr, Port: uint16(regionID)}
-	if c.handleDiscoMessage(b[:n], ipp) {
-		return 0, nil, errLoopAgain
-	}
-
-	var (
-		didNoteRecvActivity bool
-		discoEp             *discoEndpoint
-		asEp                *addrSet
-	)
-	c.mu.Lock()
-	if dk, ok := c.discoOfNode[tailcfg.NodeKey(dm.src)]; ok {
-		discoEp = c.endpointOfDisco[dk]
-		// If we know about the node (it's in discoOfNode) but don't know about the
-		// endpoint, that's because it's an idle peer that doesn't yet exist in the
-		// wireguard config. So run the receive hook, if defined, which should
-		// create the wireguard peer.
-		if discoEp == nil && c.noteRecvActivity != nil {
-			didNoteRecvActivity = true
-			c.mu.Unlock()          // release lock before calling noteRecvActivity
-			c.noteRecvActivity(dk) // (calls back into CreateEndpoint)
-			// Now require the lock. No invariants need to be rechecked; just
-			// 1-2 map lookups follow that are harmless if, say, the peer has
-			// been deleted during this time.
-			c.mu.Lock()
-
-			discoEp = c.endpointOfDisco[dk]
-			c.logf("magicsock: DERP packet received from idle peer %v; created=%v", dm.src.ShortString(), ep != nil)
+	for {
+		n, pAddr, err := c.pconn6.ReadFrom(b)
+		if err != nil {
+			return 0, nil, nil, err
 		}
-	}
-	if !c.disableLegacy {
-		asEp = c.addrsByKey[dm.src]
-	}
-	c.mu.Unlock()
-
-	if discoEp != nil {
-		ep = discoEp
-	} else if asEp != nil {
-		ep = asEp
-	} else {
-		key := wgkey.Key(dm.src)
-		c.logf("magicsock: DERP packet from unknown key: %s", key.ShortString())
-		ep = c.findEndpoint(ipp, nil, b[:n])
-		if ep == nil {
-			return 0, nil, errLoopAgain
+		addr := pAddr.(*net.UDPAddr)
+		ipp, ok := c.pconn6.ippCache.IPPort(addr)
+		if !ok {
+			continue
+		}
+		if stun.Is(b[:n]) {
+			c.stunReceiveFunc.Load().(func([]byte, netaddr.IPPort))(b[:n], ipp)
+			continue
+		}
+		if c.handleDiscoMessage(b[:n], ipp) {
+			continue
 		}
-	}

-	if !didNoteRecvActivity {
+		ep := c.findEndpoint(ipp, addr)
 		c.noteRecvActivityFromEndpoint(ep)
+		return n, ep, wgRecvAddr(ep, ipp, addr), nil
 	}
-	return n, ep, nil
 }

 // discoLogLevel controls the verbosity of discovery log messages.
@@ -2113,6 +2111,7 @@ func (c *Conn) SetNetworkMap(nm *controlclient.NetworkMap) {
 			delete(c.sharedDiscoKey, dk)
 		}
 	}
+
 }

 func (c *Conn) wantDerpLocked() bool { return c.derpMap != nil }
@@ -2218,10 +2217,11 @@ func (c *Conn) LastMark() uint32           { return 0 }
 // Only the first close does anything. Any later closes return nil.
 func (c *Conn) Close() error {
 	c.mu.Lock()
-	defer c.mu.Unlock()
 	if c.closed {
+		c.mu.Unlock()
 		return nil
 	}
+	defer c.mu.Unlock()

 	for _, ep := range c.endpointOfDisco {
 		ep.stopAndReset()
@@ -2245,13 +2245,6 @@ func (c *Conn) Close() error {
 	return err
 }

-// isClosed reports whether c is closed.
-func (c *Conn) isClosed() bool {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.closed
-}
-
 func (c *Conn) goroutinesRunningLocked() bool {
 	if c.endpointsUpdateActive {
 		return true
@@ -2324,7 +2317,7 @@ func (c *Conn) periodicReSTUN() {
 	var lastIdleState opt.Bool
 	for {
 		select {
-		case <-c.donec:
+		case <-c.donec():
 			return
 		case <-timer.C:
 			doReSTUN := c.shouldDoPeriodicReSTUN()
@@ -2349,7 +2342,7 @@ func (c *Conn) periodicDerpCleanup() {
 	defer ticker.Stop()
 	for {
 		select {
-		case <-c.donec:
+		case <-c.donec():
 			return
 		case <-ticker.C:
 			c.cleanStaleDerp()
@@ -2563,6 +2556,10 @@ func (c *Conn) CreateEndpoint(pubKey [32]byte, addrs string) (conn.Endpoint, err
 // RebindingUDPConn is a UDP socket that can be re-bound.
 // Unix has no notion of re-binding a socket, so we swap it out for a new one.
 type RebindingUDPConn struct {
+	// ippCache is a cache from UDPAddr => netaddr.IPPort. It's not safe for concurrent use.
+	// This is used by ReceiveIPv6 and awaitUDP4 (called from ReceiveIPv4).
+	ippCache ippCache
+
 	mu    sync.Mutex
 	pconn net.PacketConn
 }
@@ -2713,14 +2710,10 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 	ss := &ipnstate.PeerStatus{
 		PublicKey: c.privateKey.Public(),
 		Addrs:     c.lastEndpoints,
-		OS:        version.OS(),
 	}
 	if c.netMap != nil {
 		ss.HostName = c.netMap.Hostinfo.Hostname
-		ss.DNSName = c.netMap.Name
-		ss.UserID = c.netMap.User
-	} else {
-		ss.HostName, _ = os.Hostname()
+		ss.OS = c.netMap.Hostinfo.OS
 	}
 	if c.derpMap != nil {
 		derpRegion, ok := c.derpMap.Regions[c.myDerp]
@@ -2789,6 +2782,7 @@ type discoEndpoint struct {
 	discoKey           tailcfg.DiscoKey // for discovery mesages
 	discoShort         string           // ShortString of discoKey
 	fakeWGAddr         netaddr.IPPort   // the UDP address we tell wireguard-go we're using
+	fakeWGAddrStd      *net.UDPAddr     // the *net.UDPAddr form of fakeWGAddr
 	wgEndpointHostPort string           // string from CreateEndpoint: "<hex-discovery-key>.disco.tailscale:12345"

 	// Owned by Conn.mu:
@@ -2923,6 +2917,7 @@ func (de *discoEndpoint) initFakeUDPAddr() {
 		IP:   netaddr.IPFrom16(addr),
 		Port: 12345,
 	}
+	de.fakeWGAddrStd = de.fakeWGAddr.UDPAddr()
 }

 // isFirstRecvActivityInAwhile notes that receive activity has occured for this
@@ -2945,11 +2940,19 @@ func (de *discoEndpoint) String() string {
 	return fmt.Sprintf("magicsock.discoEndpoint{%v, %v}", de.publicKey.ShortString(), de.discoShort)
 }

-func (de *discoEndpoint) Addrs() string {
+func (de *discoEndpoint) Addrs() []wgcfg.Endpoint {
 	// This has to be the same string that was passed to
 	// CreateEndpoint, otherwise Reconfig will end up recreating
 	// Endpoints and losing state over time.
-	return de.wgEndpointHostPort
+	host, portStr, err := net.SplitHostPort(de.wgEndpointHostPort)
+	if err != nil {
+		panic(err)
+	}
+	port, err := strconv.ParseUint(portStr, 10, 16)
+	if err != nil {
+		panic(err)
+	}
+	return []wgcfg.Endpoint{{Host: host, Port: uint16(port)}}
 }

 func (de *discoEndpoint) ClearSrc()           {}
@@ -2958,6 +2961,11 @@ func (de *discoEndpoint) SrcIP() net.IP       { panic("unused") } // unused by w
 func (de *discoEndpoint) DstToString() string { return de.wgEndpointHostPort }
 func (de *discoEndpoint) DstIP() net.IP       { panic("unused") }
 func (de *discoEndpoint) DstToBytes() []byte  { return packIPPort(de.fakeWGAddr) }
+func (de *discoEndpoint) UpdateDst(addr *net.UDPAddr) error {
+	// This is called ~per packet (and requiring a mutex acquisition inside wireguard-go).
+	// TODO(bradfitz): make that cheaper and/or remove it. We don't need it.
+	return nil
+}

 // addrForSendLocked returns the address(es) that should be used for
 // sending the next packet. Zero, one, or both of UDP address and DERP
@@ -2982,10 +2990,6 @@ func (de *discoEndpoint) heartbeat() {

 	de.heartBeatTimer = nil

-	if de.c.isClosed() {
-		return
-	}
-
 	if de.lastSend.IsZero() {
 		// Shouldn't happen.
 		return
@@ -3447,24 +3451,45 @@ func (de *discoEndpoint) stopAndReset() {
 	de.pendingCLIPings = nil
 }

+// ippCache is a cache of *net.UDPAddr => netaddr.IPPort mappings.
+//
+// It's not safe for concurrent use.
+type ippCache struct {
+	c *lru.Cache
+}
+
+// IPPort is a caching wrapper around netaddr.FromStdAddr.
+//
+// It is not safe for concurrent use.
+func (ic *ippCache) IPPort(u *net.UDPAddr) (netaddr.IPPort, bool) {
+	if u == nil || len(u.IP) > 16 {
+		return netaddr.IPPort{}, false
+	}
+	if ic.c == nil {
+		ic.c = lru.New(64) // arbitrary
+	}
+
+	key := ippCacheKey{ipLen: uint8(len(u.IP)), port: uint16(u.Port), zone: u.Zone}
+	copy(key.ip[:], u.IP[:])
+
+	if v, ok := ic.c.Get(key); ok {
+		return v.(netaddr.IPPort), true
+	}
+	ipp, ok := netaddr.FromStdAddr(u.IP, u.Port, u.Zone)
+	if ok {
+		ic.c.Add(key, ipp)
+	}
+	return ipp, ok
+}
+
+// ippCacheKey is the cache key type used by ippCache.IPPort.
+// It must be comparable, being used as a map key in the lru package.
+type ippCacheKey struct {
+	ip    [16]byte
+	port  uint16
+	ipLen uint8 // bytes in ip that are valid; rest are zero
+	zone  string
+}
+
 // derpStr replaces DERP IPs in s with "derp-".
 func derpStr(s string) string { return strings.ReplaceAll(s, "127.3.3.40:", "derp-") }
-
-// WhoIs reports the node and user who owns the node with the given IP.
-// If ok == true, n and u are valid.
-func (c *Conn) WhoIs(ip netaddr.IP) (n *tailcfg.Node, u tailcfg.UserProfile, ok bool) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	if c.netMap == nil {
-		return n, u, false
-	}
-	for _, p := range c.netMap.Peers {
-		for _, ipp := range p.Addresses {
-			if ipp.IsSingleIP() && ipp.IP == ip {
-				u, ok := c.netMap.UserProfiles[p.User]
-				return p, u, ok
-			}
-		}
-	}
-	return nil, u, false
-}
--- a/wgengine/magicsock/magicsock_test.go
+++ b/wgengine/magicsock/magicsock_test.go
@@ -20,7 +20,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"testing"
 	"time"
 	"unsafe"
@@ -132,7 +131,7 @@ type magicStack struct {
 // newMagicStack builds and initializes an idle magicsock and
 // friends. You need to call conn.SetNetworkMap and dev.Reconfig
 // before anything interesting happens.
-func newMagicStack(t testing.TB, logf logger.Logf, l nettype.PacketListener, derpMap *tailcfg.DERPMap, disableLegacy bool) *magicStack {
+func newMagicStack(t testing.TB, logf logger.Logf, l nettype.PacketListener, derpMap *tailcfg.DERPMap) *magicStack {
 	t.Helper()

 	privateKey, err := wgkey.NewPrivate()
@@ -147,8 +146,7 @@ func newMagicStack(t testing.TB, logf logger.Logf, l nettype.PacketListener, der
 		EndpointsFunc: func(eps []string) {
 			epCh <- eps
 		},
-		SimulatedNetwork:        l != nettype.Std{},
-		DisableLegacyNetworking: disableLegacy,
+		SimulatedNetwork: l != nettype.Std{},
 	})
 	if err != nil {
 		t.Fatalf("constructing magicsock: %v", err)
@@ -164,7 +162,11 @@ func newMagicStack(t testing.TB, logf logger.Logf, l nettype.PacketListener, der
 	tsTun.SetFilter(filter.NewAllowAllForTest(logf))

 	dev := device.NewDevice(tsTun, &device.DeviceOptions{
-		Logger:         wireguardGoLogger(logf),
+		Logger: &device.Logger{
+			Debug: logger.StdLogger(logf),
+			Info:  logger.StdLogger(logf),
+			Error: logger.StdLogger(logf),
+		},
 		CreateEndpoint: conn.CreateEndpoint,
 		CreateBind:     conn.CreateBind,
 		SkipBindUpdate: true,
@@ -337,10 +339,9 @@ func TestNewConn(t *testing.T) {

 	port := pickPort(t)
 	conn, err := NewConn(Options{
-		Port:                    port,
-		EndpointsFunc:           epFunc,
-		Logf:                    t.Logf,
-		DisableLegacyNetworking: true,
+		Port:          port,
+		EndpointsFunc: epFunc,
+		Logf:          t.Logf,
 	})
 	if err != nil {
 		t.Fatal(err)
@@ -353,7 +354,7 @@ func TestNewConn(t *testing.T) {
 	go func() {
 		var pkt [64 << 10]byte
 		for {
-			_, _, err := conn.ReceiveIPv4(pkt[:])
+			_, _, _, err := conn.ReceiveIPv4(pkt[:])
 			if err != nil {
 				return
 			}
@@ -481,9 +482,12 @@ func makeConfigs(t *testing.T, addrs []netaddr.IPPort) []wgcfg.Config {
 				continue
 			}
 			peer := wgcfg.Peer{
-				PublicKey:           privKeys[peerNum].Public(),
-				AllowedIPs:          addresses[peerNum],
-				Endpoints:           addr.String(),
+				PublicKey:  privKeys[peerNum].Public(),
+				AllowedIPs: addresses[peerNum],
+				Endpoints: []wgcfg.Endpoint{{
+					Host: addr.IP.String(),
+					Port: addr.Port,
+				}},
 				PersistentKeepalive: 25,
 			}
 			cfg.Peers = append(cfg.Peers, peer)
@@ -514,9 +518,8 @@ func TestDeviceStartStop(t *testing.T) {
 	defer rc.Assert(t)

 	conn, err := NewConn(Options{
-		EndpointsFunc:           func(eps []string) {},
-		Logf:                    t.Logf,
-		DisableLegacyNetworking: true,
+		EndpointsFunc: func(eps []string) {},
+		Logf:          t.Logf,
 	})
 	if err != nil {
 		t.Fatal(err)
@@ -526,7 +529,11 @@ func TestDeviceStartStop(t *testing.T) {

 	tun := tuntest.NewChannelTUN()
 	dev := device.NewDevice(tun.TUN(), &device.DeviceOptions{
-		Logger:         wireguardGoLogger(t.Logf),
+		Logger: &device.Logger{
+			Debug: logger.StdLogger(t.Logf),
+			Info:  logger.StdLogger(t.Logf),
+			Error: logger.StdLogger(t.Logf),
+		},
 		CreateEndpoint: conn.CreateEndpoint,
 		CreateBind:     conn.CreateBind,
 		SkipBindUpdate: true,
@@ -535,61 +542,6 @@ func TestDeviceStartStop(t *testing.T) {
 	dev.Close()
 }

-// Exercise a code path in sendDiscoMessage if the connection has been closed.
-func TestConnClosed(t *testing.T) {
-	mstun := &natlab.Machine{Name: "stun"}
-	m1 := &natlab.Machine{Name: "m1"}
-	m2 := &natlab.Machine{Name: "m2"}
-	inet := natlab.NewInternet()
-	sif := mstun.Attach("eth0", inet)
-	m1if := m1.Attach("eth0", inet)
-	m2if := m2.Attach("eth0", inet)
-
-	d := &devices{
-		m1:     m1,
-		m1IP:   m1if.V4(),
-		m2:     m2,
-		m2IP:   m2if.V4(),
-		stun:   mstun,
-		stunIP: sif.V4(),
-	}
-
-	logf, closeLogf := logger.LogfCloser(t.Logf)
-	defer closeLogf()
-
-	derpMap, cleanup := runDERPAndStun(t, logf, d.stun, d.stunIP)
-	defer cleanup()
-
-	ms1 := newMagicStack(t, logger.WithPrefix(logf, "conn1: "), d.m1, derpMap, true)
-	defer ms1.Close()
-	ms2 := newMagicStack(t, logger.WithPrefix(logf, "conn2: "), d.m2, derpMap, true)
-	defer ms2.Close()
-
-	cleanup = meshStacks(t.Logf, []*magicStack{ms1, ms2})
-	defer cleanup()
-
-	pkt := tuntest.Ping(ms2.IP(t).IPAddr().IP, ms1.IP(t).IPAddr().IP)
-
-	if len(ms1.conn.activeDerp) == 0 {
-		t.Errorf("unexpected DERP empty got: %v want: >0", len(ms1.conn.activeDerp))
-	}
-
-	ms1.conn.Close()
-	ms2.conn.Close()
-
-	// This should hit a c.closed conditional in sendDiscoMessage() and return immediately.
-	ms1.tun.Outbound <- pkt
-	select {
-	case <-ms2.tun.Inbound:
-		t.Error("unexpected response with connection closed")
-	case <-time.After(100 * time.Millisecond):
-	}
-
-	if len(ms1.conn.activeDerp) > 0 {
-		t.Errorf("unexpected DERP active got: %v want:0", len(ms1.conn.activeDerp))
-	}
-}
-
 func makeNestable(t *testing.T) (logf logger.Logf, setT func(t *testing.T)) {
 	var mu sync.RWMutex
 	cur := t
@@ -836,20 +788,18 @@ func testActiveDiscovery(t *testing.T, d *devices) {
 	setT(t)

 	start := time.Now()
-	wlogf := func(msg string, args ...interface{}) {
+	logf := func(msg string, args ...interface{}) {
 		t.Helper()
 		msg = fmt.Sprintf("%s: %s", time.Since(start).Truncate(time.Microsecond), msg)
 		tlogf(msg, args...)
 	}
-	logf, closeLogf := logger.LogfCloser(wlogf)
-	defer closeLogf()

 	derpMap, cleanup := runDERPAndStun(t, logf, d.stun, d.stunIP)
 	defer cleanup()

-	m1 := newMagicStack(t, logger.WithPrefix(logf, "conn1: "), d.m1, derpMap, true)
+	m1 := newMagicStack(t, logger.WithPrefix(logf, "conn1: "), d.m1, derpMap)
 	defer m1.Close()
-	m2 := newMagicStack(t, logger.WithPrefix(logf, "conn2: "), d.m2, derpMap, true)
+	m2 := newMagicStack(t, logger.WithPrefix(logf, "conn2: "), d.m2, derpMap)
 	defer m2.Close()

 	cleanup = meshStacks(logf, []*magicStack{m1, m2})
@@ -901,9 +851,9 @@ func testTwoDevicePing(t *testing.T, d *devices) {
 	derpMap, cleanup := runDERPAndStun(t, logf, d.stun, d.stunIP)
 	defer cleanup()

-	m1 := newMagicStack(t, logf, d.m1, derpMap, false)
+	m1 := newMagicStack(t, logf, d.m1, derpMap)
 	defer m1.Close()
-	m2 := newMagicStack(t, logf, d.m2, derpMap, false)
+	m2 := newMagicStack(t, logf, d.m2, derpMap)
 	defer m2.Close()

 	addrs := []netaddr.IPPort{
@@ -1050,12 +1000,12 @@ func testTwoDevicePing(t *testing.T, d *devices) {
 	})

 	// Add DERP relay.
-	derpEp := "127.3.3.40:1"
+	derpEp := wgcfg.Endpoint{Host: "127.3.3.40", Port: 1}
 	ep0 := cfgs[0].Peers[0].Endpoints
-	ep0 = derpEp + "," + ep0
+	ep0 = append([]wgcfg.Endpoint{derpEp}, ep0...)
 	cfgs[0].Peers[0].Endpoints = ep0
 	ep1 := cfgs[1].Peers[0].Endpoints
-	ep1 = derpEp + "," + ep1
+	ep1 = append([]wgcfg.Endpoint{derpEp}, ep1...)
 	cfgs[1].Peers[0].Endpoints = ep1
 	if err := m1.dev.Reconfig(&cfgs[0]); err != nil {
 		t.Fatal(err)
@@ -1071,8 +1021,8 @@ func testTwoDevicePing(t *testing.T, d *devices) {
 	})

 	// Disable real route.
-	cfgs[0].Peers[0].Endpoints = derpEp
-	cfgs[1].Peers[0].Endpoints = derpEp
+	cfgs[0].Peers[0].Endpoints = []wgcfg.Endpoint{derpEp}
+	cfgs[1].Peers[0].Endpoints = []wgcfg.Endpoint{derpEp}
 	if err := m1.dev.Reconfig(&cfgs[0]); err != nil {
 		t.Fatal(err)
 	}
@@ -1126,7 +1076,7 @@ func testTwoDevicePing(t *testing.T, d *devices) {
 	})
 }

-// TestAddrSet tests addrSet appendDests and updateDst.
+// TestAddrSet tests addrSet appendDests and UpdateDst.
 func TestAddrSet(t *testing.T) {
 	tstest.PanicOnLog()
 	rc := tstest.NewResourceCheck()
@@ -1288,7 +1238,7 @@ func TestAddrSet(t *testing.T) {
 				faket = faket.Add(st.advance)

 				if st.updateDst != nil {
-					if err := tt.as.updateDst(st.updateDst); err != nil {
+					if err := tt.as.UpdateDst(st.updateDst); err != nil {
 						t.Fatal(err)
 					}
 					continue
@@ -1382,7 +1332,7 @@ func stringifyConfig(cfg wgcfg.Config) string {
 	return string(j)
 }

-func Test32bitAlignment(t *testing.T) {
+func TestDiscoEndpointAlignment(t *testing.T) {
 	var de discoEndpoint
 	off := unsafe.Offsetof(de.lastRecvUnixAtomic)
 	if off%8 != 0 {
@@ -1394,8 +1344,6 @@ func Test32bitAlignment(t *testing.T) {
 	if de.isFirstRecvActivityInAwhile() {
 		t.Error("expected false on second call")
 	}
-	var c Conn
-	atomic.AddInt64(&c.derpRecvCountAtomic, 1)
 }

 func BenchmarkReceiveFrom(b *testing.B) {
@@ -1406,7 +1354,6 @@ func BenchmarkReceiveFrom(b *testing.B) {
 		EndpointsFunc: func(eps []string) {
 			b.Logf("endpoints: %q", eps)
 		},
-		DisableLegacyNetworking: true,
 	})
 	if err != nil {
 		b.Fatal(err)
@@ -1419,21 +1366,6 @@ func BenchmarkReceiveFrom(b *testing.B) {
 	}
 	defer sendConn.Close()

-	// Give conn just enough state that it'll recognize sendConn as a
-	// valid peer and not fall through to the legacy magicsock
-	// codepath.
-	discoKey := tailcfg.DiscoKey{31: 1}
-	conn.SetNetworkMap(&controlclient.NetworkMap{
-		Peers: []*tailcfg.Node{
-			{
-				DiscoKey:  discoKey,
-				Endpoints: []string{sendConn.LocalAddr().String()},
-			},
-		},
-	})
-	conn.CreateEndpoint([32]byte{1: 1}, "0000000000000000000000000000000000000000000000000000000000000001.disco.tailscale:12345")
-	conn.addValidDiscoPathForTest(discoKey, netaddr.MustParseIPPort(sendConn.LocalAddr().String()))
-
 	var dstAddr net.Addr = conn.pconn4.LocalAddr()
 	sendBuf := make([]byte, 1<<10)
 	for i := range sendBuf {
@@ -1445,12 +1377,13 @@ func BenchmarkReceiveFrom(b *testing.B) {
 		if _, err := sendConn.WriteTo(sendBuf, dstAddr); err != nil {
 			b.Fatalf("WriteTo: %v", err)
 		}
-		n, ep, err := conn.ReceiveIPv4(buf)
+		n, ep, addr, err := conn.ReceiveIPv4(buf)
 		if err != nil {
 			b.Fatal(err)
 		}
 		_ = n
 		_ = ep
+		_ = addr
 	}
 }

@@ -1484,19 +1417,3 @@ func BenchmarkReceiveFrom_Native(b *testing.B) {
 		}
 	}
 }
-
-func wireguardGoLogger(logf logger.Logf) *device.Logger {
-	// wireguard-go logs as it starts and stops routines.
-	// Silence those; there are a lot of them, and they're just noise.
-	allowLogf := func(s string) bool {
-		return !strings.Contains(s, "Routine:")
-	}
-	filtered := logger.Filtered(logf, allowLogf)
-	stdLogger := logger.StdLogger(filtered)
-
-	return &device.Logger{
-		Debug: stdLogger,
-		Info:  stdLogger,
-		Error: stdLogger,
-	}
-}
--- a/wgengine/monitor/monitor_windows.go
+++ b/wgengine/monitor/monitor_windows.go
@@ -51,14 +51,13 @@ type messageOrError struct {
 }

 type winMon struct {
-	ctx             context.Context
-	cancel          context.CancelFunc
-	messagec        chan messageOrError
-	logf            logger.Logf
-	pollTicker      *time.Ticker
-	lastState       *interfaces.State
-	closeHandle     windows.Handle // signaled upon close
-	goroutineDoneCh chan struct{}  // closed when awaitIPAndRouteChanges goroutine has stopped
+	ctx         context.Context
+	cancel      context.CancelFunc
+	messagec    chan messageOrError
+	logf        logger.Logf
+	pollTicker  *time.Ticker
+	lastState   *interfaces.State
+	closeHandle windows.Handle // signaled upon close

 	mu            sync.Mutex
 	lastNetChange time.Time
@@ -73,13 +72,12 @@ func newOSMon(logf logger.Logf) (osMon, error) {

 	ctx, cancel := context.WithCancel(context.Background())
 	m := &winMon{
-		logf:            logf,
-		ctx:             ctx,
-		cancel:          cancel,
-		messagec:        make(chan messageOrError, 1),
-		pollTicker:      time.NewTicker(pollIntervalSlow),
-		closeHandle:     closeHandle,
-		goroutineDoneCh: make(chan struct{}),
+		logf:        logf,
+		ctx:         ctx,
+		cancel:      cancel,
+		messagec:    make(chan messageOrError, 1),
+		pollTicker:  time.NewTicker(pollIntervalSlow),
+		closeHandle: closeHandle,
 	}
 	go m.awaitIPAndRouteChanges()
 	return m, nil
@@ -89,12 +87,6 @@ func (m *winMon) Close() error {
 	m.cancel()
 	m.pollTicker.Stop()
 	windows.SetEvent(m.closeHandle) // wakes up any reader blocked in Receive
-
-	// Wait for awaitIPAndRouteChannges to be done, which could
-	// still be using the m.closeHandle.
-	<-m.goroutineDoneCh
-
-	windows.CloseHandle(m.closeHandle)
 	return nil
 }

@@ -133,7 +125,6 @@ func (m *winMon) stateChanged() bool {
 }

 func (m *winMon) awaitIPAndRouteChanges() {
-	defer close(m.goroutineDoneCh)
 	for {
 		msg, err := m.getIPOrRouteChangeMessage()
 		if err == errClosed {
--- a/wgengine/netstack/netstack.go
+++ b/wgengine/netstack/netstack.go
@@ -1,197 +0,0 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// netstack doesn't build on 32-bit machines (https://github.com/google/gvisor/issues/5241)
-// +build amd64 arm64 ppc64le riscv64 s390x
-
-// Package netstack wires up gVisor's netstack into Tailscale.
-package netstack
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"log"
-	"net"
-	"strings"
-
-	"gvisor.dev/gvisor/pkg/tcpip"
-	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
-	"gvisor.dev/gvisor/pkg/tcpip/buffer"
-	"gvisor.dev/gvisor/pkg/tcpip/header"
-	"gvisor.dev/gvisor/pkg/tcpip/link/channel"
-	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
-	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
-	"gvisor.dev/gvisor/pkg/waiter"
-	"inet.af/netaddr"
-	"tailscale.com/control/controlclient"
-	"tailscale.com/net/packet"
-	"tailscale.com/types/logger"
-	"tailscale.com/wgengine"
-	"tailscale.com/wgengine/filter"
-	"tailscale.com/wgengine/magicsock"
-	"tailscale.com/wgengine/tstun"
-)
-
-func Impl(logf logger.Logf, tundev *tstun.TUN, e wgengine.Engine, mc *magicsock.Conn) error {
-	if mc == nil {
-		return errors.New("nil magicsock.Conn")
-	}
-	if tundev == nil {
-		return errors.New("nil tundev")
-	}
-	if logf == nil {
-		return errors.New("nil logger")
-	}
-	if e == nil {
-		return errors.New("nil Engine")
-	}
-	ipstack := stack.New(stack.Options{
-		NetworkProtocols:   []stack.NetworkProtocolFactory{ipv4.NewProtocol},
-		TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol, icmp.NewProtocol4},
-	})
-
-	const mtu = 1500
-	linkEP := channel.New(512, mtu, "")
-
-	const nicID = 1
-	if err := ipstack.CreateNIC(nicID, linkEP); err != nil {
-		log.Fatal(err)
-	}
-
-	e.AddNetworkMapCallback(func(nm *controlclient.NetworkMap) {
-		oldIPs := make(map[tcpip.Address]bool)
-		for _, ip := range ipstack.AllAddresses()[nicID] {
-			oldIPs[ip.AddressWithPrefix.Address] = true
-		}
-		newIPs := make(map[tcpip.Address]bool)
-		for _, ip := range nm.Addresses {
-			newIPs[tcpip.Address(ip.IPNet().IP)] = true
-		}
-
-		ipsToBeAdded := make(map[tcpip.Address]bool)
-		for ip := range newIPs {
-			if !oldIPs[ip] {
-				ipsToBeAdded[ip] = true
-			}
-		}
-		ipsToBeRemoved := make(map[tcpip.Address]bool)
-		for ip := range oldIPs {
-			if !newIPs[ip] {
-				ipsToBeRemoved[ip] = true
-			}
-		}
-
-		for ip := range ipsToBeRemoved {
-			err := ipstack.RemoveAddress(nicID, ip)
-			if err != nil {
-				logf("netstack: could not deregister IP %s: %v", ip, err)
-			} else {
-				logf("netstack: deregistered IP %s", ip)
-			}
-		}
-		for ip := range ipsToBeAdded {
-			err := ipstack.AddAddress(nicID, ipv4.ProtocolNumber, ip)
-			if err != nil {
-				logf("netstack: could not register IP %s: %v", ip, err)
-			} else {
-				logf("netstack: registered IP %s", ip)
-			}
-		}
-	})
-
-	// Add 0.0.0.0/0 default route.
-	subnet, _ := tcpip.NewSubnet(tcpip.Address(strings.Repeat("\x00", 4)), tcpip.AddressMask(strings.Repeat("\x00", 4)))
-	ipstack.SetRouteTable([]tcpip.Route{
-		{
-			Destination: subnet,
-			NIC:         nicID,
-		},
-	})
-
-	// use Forwarder to accept any connection from stack
-	fwd := tcp.NewForwarder(ipstack, 0, 16, func(r *tcp.ForwarderRequest) {
-		logf("XXX ForwarderRequest: %v", r)
-		var wq waiter.Queue
-		ep, err := r.CreateEndpoint(&wq)
-		if err != nil {
-			r.Complete(true)
-			return
-		}
-		r.Complete(false)
-		c := gonet.NewTCPConn(&wq, ep)
-		// TCP echo
-		go echo(c, e, mc)
-
-	})
-	ipstack.SetTransportProtocolHandler(tcp.ProtocolNumber, fwd.HandlePacket)
-
-	go func() {
-		for {
-			packetInfo, ok := linkEP.ReadContext(context.Background())
-			if !ok {
-				logf("XXX ReadContext-for-write = ok=false")
-				continue
-			}
-			pkt := packetInfo.Pkt
-			hdrNetwork := pkt.NetworkHeader()
-			hdrTransport := pkt.TransportHeader()
-
-			full := make([]byte, 0, pkt.Size())
-			full = append(full, hdrNetwork.View()...)
-			full = append(full, hdrTransport.View()...)
-			full = append(full, pkt.Data.ToView()...)
-
-			logf("XXX packet Write out: % x", full)
-			if err := tundev.InjectOutbound(full); err != nil {
-				log.Printf("netstack inject outbound: %v", err)
-				return
-			}
-
-		}
-	}()
-
-	tundev.PostFilterIn = func(p *packet.Parsed, t *tstun.TUN) filter.Response {
-		var pn tcpip.NetworkProtocolNumber
-		switch p.IPVersion {
-		case 4:
-			pn = header.IPv4ProtocolNumber
-		case 6:
-			pn = header.IPv6ProtocolNumber
-		}
-		logf("XXX packet in (from %v): % x", p.Src, p.Buffer())
-		vv := buffer.View(append([]byte(nil), p.Buffer()...)).ToVectorisedView()
-		packetBuf := stack.NewPacketBuffer(stack.PacketBufferOptions{
-			Data: vv,
-		})
-		linkEP.InjectInbound(pn, packetBuf)
-		return filter.Accept
-	}
-	return nil
-}
-
-func echo(c *gonet.TCPConn, e wgengine.Engine, mc *magicsock.Conn) {
-	defer c.Close()
-	src, _ := netaddr.FromStdIP(c.RemoteAddr().(*net.TCPAddr).IP)
-	who := ""
-	if n, u, ok := mc.WhoIs(src); ok {
-		who = fmt.Sprintf("%v from %v", u.DisplayName, n.Name)
-	}
-	fmt.Fprintf(c, "Hello, %s! Thanks for connecting to me on port %v (Try other ports too!)\nEchoing...\n",
-		who,
-		c.LocalAddr().(*net.TCPAddr).Port)
-	buf := make([]byte, 1500)
-	for {
-		n, err := c.Read(buf)
-		if err != nil {
-			log.Printf("Err: %v", err)
-			break
-		}
-		c.Write(buf[:n])
-	}
-	log.Print("Connection closed")
-}
--- a/wgengine/netstack/netstack_32bit.go
+++ b/wgengine/netstack/netstack_32bit.go
@@ -1,21 +0,0 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// netstack doesn't build on 32-bit machines (https://github.com/google/gvisor/issues/5241)
-// +build !amd64,!arm64,!ppc64le,!riscv64,!s390x
-
-package netstack
-
-import (
-	"errors"
-
-	"tailscale.com/types/logger"
-	"tailscale.com/wgengine"
-	"tailscale.com/wgengine/magicsock"
-	"tailscale.com/wgengine/tstun"
-)
-
-func Impl(logf logger.Logf, tundev *tstun.TUN, e wgengine.Engine, mc *magicsock.Conn) error {
-	return errors.New("netstack is not supported on 32-bit platforms for now; see https://github.com/google/gvisor/issues/5241")
-}
--- a/wgengine/pendopen.go
+++ b/wgengine/pendopen.go
@@ -1,169 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package wgengine
-
-import (
-	"os"
-	"strconv"
-	"time"
-
-	"tailscale.com/net/flowtrack"
-	"tailscale.com/net/packet"
-	"tailscale.com/wgengine/filter"
-	"tailscale.com/wgengine/tstun"
-)
-
-const tcpTimeoutBeforeDebug = 5 * time.Second
-
-// debugConnectFailures reports whether the local node should track
-// outgoing TCP connections and log which ones fail and why.
-func debugConnectFailures() bool {
-	s := os.Getenv("TS_DEBUG_CONNECT_FAILURES")
-	if s == "" {
-		return true
-	}
-	v, _ := strconv.ParseBool(s)
-	return v
-}
-
-type pendingOpenFlow struct {
-	timer *time.Timer // until giving up on the flow
-}
-
-func (e *userspaceEngine) removeFlow(f flowtrack.Tuple) (removed bool) {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-	of, ok := e.pendOpen[f]
-	if !ok {
-		// Not a tracked flow (likely already removed)
-		return false
-	}
-	of.timer.Stop()
-	delete(e.pendOpen, f)
-	return true
-}
-
-func (e *userspaceEngine) trackOpenPreFilterIn(pp *packet.Parsed, t *tstun.TUN) (res filter.Response) {
-	res = filter.Accept // always
-
-	if pp.IPProto == packet.TSMP {
-		res = filter.DropSilently
-		rh, ok := pp.AsTailscaleRejectedHeader()
-		if !ok {
-			return
-		}
-		if f := rh.Flow(); e.removeFlow(f) {
-			e.logf("open-conn-track: flow %v %v > %v rejected due to %v", rh.Proto, rh.Src, rh.Dst, rh.Reason)
-		}
-		return
-	}
-
-	if pp.IPVersion == 0 ||
-		pp.IPProto != packet.TCP ||
-		pp.TCPFlags&(packet.TCPSyn|packet.TCPRst) == 0 {
-		return
-	}
-
-	// Either a SYN or a RST came back. Remove it in either case.
-
-	f := flowtrack.Tuple{Dst: pp.Src, Src: pp.Dst} // src/dst reversed
-	removed := e.removeFlow(f)
-	if removed && pp.TCPFlags&packet.TCPRst != 0 {
-		e.logf("open-conn-track: flow TCP %v got RST by peer", f)
-	}
-	return
-}
-
-func (e *userspaceEngine) trackOpenPostFilterOut(pp *packet.Parsed, t *tstun.TUN) (res filter.Response) {
-	res = filter.Accept // always
-
-	if pp.IPVersion == 0 ||
-		pp.IPProto != packet.TCP ||
-		pp.TCPFlags&packet.TCPSyn == 0 {
-		return
-	}
-
-	flow := flowtrack.Tuple{Src: pp.Src, Dst: pp.Dst}
-	timer := time.AfterFunc(tcpTimeoutBeforeDebug, func() {
-		e.onOpenTimeout(flow)
-	})
-
-	e.mu.Lock()
-	defer e.mu.Unlock()
-	if e.pendOpen == nil {
-		e.pendOpen = make(map[flowtrack.Tuple]*pendingOpenFlow)
-	}
-	if _, dup := e.pendOpen[flow]; dup {
-		// Duplicates are expected when the OS retransmits. Ignore.
-		return
-	}
-	e.pendOpen[flow] = &pendingOpenFlow{timer: timer}
-
-	return filter.Accept
-}
-
-func (e *userspaceEngine) onOpenTimeout(flow flowtrack.Tuple) {
-	e.mu.Lock()
-	if _, ok := e.pendOpen[flow]; !ok {
-		// Not a tracked flow, or already handled & deleted.
-		e.mu.Unlock()
-		return
-	}
-	delete(e.pendOpen, flow)
-	e.mu.Unlock()
-
-	// Diagnose why it might've timed out.
-	n, ok := e.magicConn.PeerForIP(flow.Dst.IP)
-	if !ok {
-		e.logf("open-conn-track: timeout opening %v; no associated peer node", flow)
-		return
-	}
-	if n.DiscoKey.IsZero() {
-		e.logf("open-conn-track: timeout opening %v; peer node %v running pre-0.100", flow, n.Key.ShortString())
-		return
-	}
-	if n.DERP == "" {
-		e.logf("open-conn-track: timeout opening %v; peer node %v not connected to any DERP relay", flow, n.Key.ShortString())
-		return
-	}
-	var lastSeen time.Time
-	if n.LastSeen != nil {
-		lastSeen = *n.LastSeen
-	}
-
-	var ps *PeerStatus
-	if st, err := e.getStatus(); err == nil {
-		for _, v := range st.Peers {
-			if v.NodeKey == n.Key {
-				v := v // copy
-				ps = &v
-			}
-		}
-	} else {
-		e.logf("open-conn-track: timeout opening %v to node %v; failed to get engine status: %v", flow, n.Key.ShortString(), err)
-		return
-	}
-	if ps == nil {
-		e.logf("open-conn-track: timeout opening %v; target node %v in netmap but unknown to wireguard", flow, n.Key.ShortString())
-		return
-	}
-
-	// TODO(bradfitz): figure out what PeerStatus.LastHandshake
-	// is. It appears to be the last time we sent a handshake,
-	// which isn't what I expected. I thought it was when a
-	// handshake completed, which is what I want.
-	_ = ps.LastHandshake
-
-	e.logf("open-conn-track: timeout opening %v to node %v; lastSeen=%v, lastRecv=%v",
-		flow, n.Key.ShortString(),
-		agoOrNever(lastSeen), agoOrNever(e.magicConn.LastRecvActivityOfDisco(n.DiscoKey)))
-}
-
-func agoOrNever(t time.Time) string {
-	if t.IsZero() {
-		return "never"
-	}
-	return time.Since(t).Round(time.Second).String()
-}
--- a/wgengine/router/dns/manager_windows.go
+++ b/wgengine/router/dns/manager_windows.go
@@ -18,6 +18,7 @@ import (
 const (
 	ipv4RegBase = `SYSTEM\CurrentControlSet\Services\Tcpip\Parameters`
 	ipv6RegBase = `SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters`
+	tsRegBase   = `SOFTWARE\Tailscale IPN`
 )

 type windowsManager struct {
@@ -90,6 +91,11 @@ func (m windowsManager) Up(config Config) error {
 		return err
 	}

+	newSearchList := strings.Join(config.Domains, ",")
+	if err := setRegistryString(tsRegBase, "SearchList", newSearchList); err != nil {
+		return err
+	}
+
 	// Force DNS re-registration in Active Directory. What we actually
 	// care about is that this command invokes the undocumented hidden
 	// function that forces Windows to notice that adapter settings
--- a/wgengine/tsdns/map.go
+++ b/wgengine/tsdns/map.go
@@ -26,10 +26,6 @@ type Map struct {
 }

 // NewMap returns a new Map with name to address mapping given by nameToIP.
-//
-// rootDomains are the domains whose subdomains should always be
-// resolved locally to prevent leakage of sensitive names. They should
-// end in a period ("user-foo.tailscale.net.").
 func NewMap(initNameToIP map[string]netaddr.IP, rootDomains []string) *Map {
 	// TODO(dmytro): we have to allocate names and ipToName, but nameToIP can be avoided.
 	// It is here because control sends us names not in canonical form. Change this.
--- a/wgengine/tsdns/tsdns.go
+++ b/wgengine/tsdns/tsdns.go
@@ -17,7 +17,6 @@ import (
 	dns "golang.org/x/net/dns/dnsmessage"
 	"inet.af/netaddr"
 	"tailscale.com/types/logger"
-	"tailscale.com/util/dnsname"
 )

 // maxResponseBytes is the maximum size of a response from a Resolver.
@@ -195,54 +194,36 @@ func (r *Resolver) Resolve(domain string, tp dns.Type) (netaddr.IP, dns.RCode, e
 	}

 	anyHasSuffix := false
-	for _, suffix := range dnsMap.rootDomains {
-		if dnsname.HasSuffix(domain, suffix) {
+	for _, rootDomain := range dnsMap.rootDomains {
+		if strings.HasSuffix(domain, rootDomain) {
 			anyHasSuffix = true
 			break
 		}
 	}
+	if !anyHasSuffix {
+		return netaddr.IP{}, dns.RCodeRefused, nil
+	}
+
 	addr, found := dnsMap.nameToIP[domain]
 	if !found {
-		if !anyHasSuffix {
-			return netaddr.IP{}, dns.RCodeRefused, nil
-		}
 		return netaddr.IP{}, dns.RCodeNameError, nil
 	}

 	// Refactoring note: this must happen after we check suffixes,
 	// otherwise we will respond with NOTIMP to requests that should be forwarded.
-	switch tp {
-	case dns.TypeA:
+	switch {
+	case tp == dns.TypeA || tp == dns.TypeALL:
 		if !addr.Is4() {
 			return netaddr.IP{}, dns.RCodeSuccess, nil
 		}
 		return addr, dns.RCodeSuccess, nil
-	case dns.TypeAAAA:
+	case tp == dns.TypeAAAA || tp == dns.TypeALL:
 		if !addr.Is6() {
 			return netaddr.IP{}, dns.RCodeSuccess, nil
 		}
 		return addr, dns.RCodeSuccess, nil
-	case dns.TypeALL:
-		// Answer with whatever we've got.
-		// It could be IPv4, IPv6, or a zero addr.
-		// TODO: Return all available resolutions (A and AAAA, if we have them).
-		return addr, dns.RCodeSuccess, nil
-
-	// Leave some some record types explicitly unimplemented.
-	// These types relate to recursive resolution or special
-	// DNS sematics and might be implemented in the future.
-	case dns.TypeNS, dns.TypeSOA, dns.TypeAXFR, dns.TypeHINFO:
-		return netaddr.IP{}, dns.RCodeNotImplemented, errNotImplemented
-
-	// For everything except for the few types above that are explictly not implemented, return no records.
-	// This is what other DNS systems do: always return NOERROR
-	// without any records whenever the requested record type is unknown.
-	// You can try this with:
-	//   dig -t TYPE9824 example.com
-	// and note that NOERROR is returned, despite that record type being made up.
 	default:
-		// no records exist of this type
-		return netaddr.IP{}, dns.RCodeSuccess, nil
+		return netaddr.IP{}, dns.RCodeNotImplemented, errNotImplemented
 	}
 }

--- a/wgengine/tsdns/tsdns_test.go
+++ b/wgengine/tsdns/tsdns_test.go
@@ -214,11 +214,6 @@ func TestResolve(t *testing.T) {
 		{"no-ipv6", "test1.ipn.dev.", dns.TypeAAAA, netaddr.IP{}, dns.RCodeSuccess},
 		{"nxdomain", "test3.ipn.dev.", dns.TypeA, netaddr.IP{}, dns.RCodeNameError},
 		{"foreign domain", "google.com.", dns.TypeA, netaddr.IP{}, dns.RCodeRefused},
-		{"all", "test1.ipn.dev.", dns.TypeA, testipv4, dns.RCodeSuccess},
-		{"mx-ipv4", "test1.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeSuccess},
-		{"mx-ipv6", "test2.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeSuccess},
-		{"mx-nxdomain", "test3.ipn.dev.", dns.TypeMX, netaddr.IP{}, dns.RCodeNameError},
-		{"ns-nxdomain", "test3.ipn.dev.", dns.TypeNS, netaddr.IP{}, dns.RCodeNameError},
 	}

 	for _, tt := range tests {
@@ -598,42 +593,6 @@ var ptrResponse = []byte{
 	0x05, 0x74, 0x65, 0x73, 0x74, 0x31, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
 }

-var ptrResponse6 = []byte{
-	0x00, 0x00, // transaction id: 0
-	0x84, 0x00, // flags: response, authoritative, no error
-	0x00, 0x01, // one question
-	0x00, 0x01, // one answer
-	0x00, 0x00, 0x00, 0x00, // no authority or additional RRs
-	// Question: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
-	0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
-	0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
-	0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
-	0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
-	0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
-	0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
-	0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
-	0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
-	0x03, 0x69, 0x70, 0x36,
-	0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
-	0x00, 0x0c, 0x00, 0x01, // type PTR, class IN6
-	// Answer: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa
-	0x01, 0x66, 0x01, 0x30, 0x01, 0x65, 0x01, 0x30,
-	0x01, 0x64, 0x01, 0x30, 0x01, 0x63, 0x01, 0x30,
-	0x01, 0x62, 0x01, 0x30, 0x01, 0x61, 0x01, 0x30,
-	0x01, 0x39, 0x01, 0x30, 0x01, 0x38, 0x01, 0x30,
-	0x01, 0x37, 0x01, 0x30, 0x01, 0x36, 0x01, 0x30,
-	0x01, 0x35, 0x01, 0x30, 0x01, 0x34, 0x01, 0x30,
-	0x01, 0x33, 0x01, 0x30, 0x01, 0x32, 0x01, 0x30,
-	0x01, 0x31, 0x01, 0x30, 0x01, 0x30, 0x01, 0x30,
-	0x03, 0x69, 0x70, 0x36,
-	0x04, 0x61, 0x72, 0x70, 0x61, 0x00,
-	0x00, 0x0c, 0x00, 0x01, // type PTR, class IN
-	0x00, 0x00, 0x02, 0x58, // TTL: 600
-	0x00, 0x0f, // length: 15 bytes
-	// PTR: test2.ipn.dev
-	0x05, 0x74, 0x65, 0x73, 0x74, 0x32, 0x03, 0x69, 0x70, 0x6e, 0x03, 0x64, 0x65, 0x76, 0x00,
-}
-
 var nxdomainResponse = []byte{
 	0x00, 0x00, // transaction id: 0
 	0x84, 0x03, // flags: response, authoritative, error: nxdomain
@@ -677,8 +636,6 @@ func TestFull(t *testing.T) {
 		{"no-ipv6", dnspacket("test1.ipn.dev.", dns.TypeAAAA), emptyResponse},
 		{"upper", dnspacket("TEST1.IPN.DEV.", dns.TypeA), ipv4UppercaseResponse},
 		{"ptr", dnspacket("4.3.2.1.in-addr.arpa.", dns.TypePTR), ptrResponse},
-		{"ptr", dnspacket("f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa.",
-			dns.TypePTR), ptrResponse6},
 		{"nxdomain", dnspacket("test3.ipn.dev.", dns.TypeA), nxdomainResponse},
 	}

--- a/wgengine/tstun/tun.go
+++ b/wgengine/tstun/tun.go
@@ -218,8 +218,8 @@ func (t *TUN) poll() {
 func (t *TUN) filterOut(p *packet.Parsed) filter.Response {

 	if t.PreFilterOut != nil {
-		if res := t.PreFilterOut(p, t); res.IsDrop() {
-			return res
+		if t.PreFilterOut(p, t) == filter.Drop {
+			return filter.Drop
 		}
 	}

@@ -234,8 +234,8 @@ func (t *TUN) filterOut(p *packet.Parsed) filter.Response {
 	}

 	if t.PostFilterOut != nil {
-		if res := t.PostFilterOut(p, t); res.IsDrop() {
-			return res
+		if t.PostFilterOut(p, t) == filter.Drop {
+			return filter.Drop
 		}
 	}

@@ -264,12 +264,12 @@ func (t *TUN) Read(buf []byte, offset int) (int, error) {
 		return 0, io.EOF
 	case err := <-t.errors:
 		return 0, err
-	case pkt := <-t.outbound:
-		n = copy(buf[offset:], pkt)
+	case packet := <-t.outbound:
+		n = copy(buf[offset:], packet)
 		// t.buffer has a fixed location in memory,
 		// so this is the easiest way to tell when it has been consumed.
-		// &pkt[0] can be used because empty packets do not reach t.outbound.
-		if &pkt[0] == &t.buffer[PacketStartOffset] {
+		// &packet[0] can be used because empty packets do not reach t.outbound.
+		if &packet[0] == &t.buffer[PacketStartOffset] {
 			t.bufferConsumed <- struct{}{}
 		} else {
 			// If the packet is not from t.buffer, then it is an injected packet.
@@ -307,8 +307,8 @@ func (t *TUN) filterIn(buf []byte) filter.Response {
 	p.Decode(buf)

 	if t.PreFilterIn != nil {
-		if res := t.PreFilterIn(p, t); res.IsDrop() {
-			return res
+		if t.PreFilterIn(p, t) == filter.Drop {
+			return filter.Drop
 		}
 	}

@@ -319,29 +319,6 @@ func (t *TUN) filterIn(buf []byte) filter.Response {
 	}

 	if filt.RunIn(p, t.filterFlags) != filter.Accept {
-
-		// Tell them, via TSMP, we're dropping them due to the ACL.
-		// Their host networking stack can translate this into ICMP
-		// or whatnot as required. But notably, their GUI or tailscale CLI
-		// can show them a rejection history with reasons.
-		if p.IPVersion == 4 && p.IPProto == packet.TCP && p.TCPFlags&packet.TCPSyn != 0 {
-			rj := packet.TailscaleRejectedHeader{
-				IPSrc:  p.Dst.IP,
-				IPDst:  p.Src.IP,
-				Src:    p.Src,
-				Dst:    p.Dst,
-				Proto:  p.IPProto,
-				Reason: packet.RejectedDueToACLs,
-			}
-			if filt.ShieldsUp() {
-				rj.Reason = packet.RejectedDueToShieldsUp
-			}
-			pkt := packet.Generate(rj, nil)
-			t.InjectOutbound(pkt)
-
-			// TODO(bradfitz): also send a TCP RST, after the TSMP message.
-		}
-
 		return filter.Drop
 	}

@@ -354,15 +331,10 @@ func (t *TUN) filterIn(buf []byte) filter.Response {
 	return filter.Accept
 }

-// Write accepts an incoming packet. The packet begins at buf[offset:],
-// like wireguard-go/tun.Device.Write.
 func (t *TUN) Write(buf []byte, offset int) (int, error) {
 	if !t.disableFilter {
-		res := t.filterIn(buf[offset:])
-		if res == filter.DropSilently {
-			return len(buf), nil
-		}
-		if res != filter.Accept {
+		response := t.filterIn(buf[offset:])
+		if response != filter.Accept {
 			return 0, ErrFiltered
 		}
 	}
--- a/wgengine/tstun/tun_test.go
+++ b/wgengine/tstun/tun_test.go
@@ -341,22 +341,6 @@ func TestAllocs(t *testing.T) {
 	}
 }

-func TestClose(t *testing.T) {
-	ftun, tun := newFakeTUN(t.Logf, false)
-
-	data := udp4("1.2.3.4", "5.6.7.8", 98, 98)
-	_, err := ftun.Write(data, 0)
-	if err != nil {
-		t.Error(err)
-	}
-
-	tun.Close()
-	_, err = ftun.Write(data, 0)
-	if err == nil {
-		t.Error("Expected error from ftun.Write() after Close()")
-	}
-}
-
 func BenchmarkWrite(b *testing.B) {
 	ftun, tun := newFakeTUN(b.Logf, true)
 	defer tun.Close()
--- a/wgengine/tstun/tun_windows.go
+++ b/wgengine/tstun/tun_windows.go
@@ -1,24 +0,0 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package tstun
-
-import (
-	"github.com/tailscale/wireguard-go/tun"
-	"github.com/tailscale/wireguard-go/tun/wintun"
-	"golang.org/x/sys/windows"
-)
-
-func init() {
-	var err error
-	tun.WintunPool, err = wintun.MakePool("Tailscale")
-	if err != nil {
-		panic(err)
-	}
-	guid, err := windows.GUIDFromString("{37217669-42da-4657-a55b-0d995d328250}")
-	if err != nil {
-		panic(err)
-	}
-	tun.WintunStaticRequestedGUID = &guid
-}
--- a/wgengine/userspace.go
+++ b/wgengine/userspace.go
@@ -30,7 +30,6 @@ import (
 	"tailscale.com/control/controlclient"
 	"tailscale.com/internal/deepprint"
 	"tailscale.com/ipn/ipnstate"
-	"tailscale.com/net/flowtrack"
 	"tailscale.com/net/interfaces"
 	"tailscale.com/net/packet"
 	"tailscale.com/net/tsaddr"
@@ -111,16 +110,14 @@ type userspaceEngine struct {
 	sentActivityAt      map[netaddr.IP]*int64     // value is atomic int64 of unixtime
 	destIPActivityFuncs map[netaddr.IP]func()

-	mu                  sync.Mutex // guards following; see lock order comment below
-	closing             bool       // Close was called (even if we're still closing)
-	statusCallback      StatusCallback
-	linkChangeCallback  func(major bool, newState *interfaces.State)
-	peerSequence        []wgkey.Key
-	endpoints           []string
-	pingers             map[wgkey.Key]*pinger // legacy pingers for pre-discovery peers
-	linkState           *interfaces.State
-	pendOpen            map[flowtrack.Tuple]*pendingOpenFlow // see pendopen.go
-	networkMapCallbacks map[*someHandle]NetworkMapCallback
+	mu                 sync.Mutex // guards following; see lock order comment below
+	closing            bool       // Close was called (even if we're still closing)
+	statusCallback     StatusCallback
+	linkChangeCallback func(major bool, newState *interfaces.State)
+	peerSequence       []wgkey.Key
+	endpoints          []string
+	pingers            map[wgkey.Key]*pinger // legacy pingers for pre-discovery peers
+	linkState          *interfaces.State

 	// Lock ordering: magicsock.Conn.mu, wgLock, then mu.
 }
@@ -141,19 +138,9 @@ type EngineConfig struct {
 	// Fake determines whether this engine is running in fake mode,
 	// which disables such features as DNS configuration and unrestricted ICMP Echo responses.
 	Fake bool
-
-	// FakeImpl, if non-nil, specifies which type of fake implementation to
-	// use. Two values are typical: nil, for a basic ping-only fake
-	// implementation, and netstack.Impl, which brings in gvisor's netstack
-	// to the binary. The desire to keep that out of some binaries is why
-	// this func exists, so wgengine need not depend on gvisor.
-	FakeImpl FakeImplFunc
 }

-// FakeImplFunc is the type used by EngineConfig.FakeImpl. See docs there.
-type FakeImplFunc func(logger.Logf, *tstun.TUN, Engine, *magicsock.Conn) error
-
-func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16, impl FakeImplFunc) (Engine, error) {
+func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16) (Engine, error) {
 	logf("Starting userspace wireguard engine (with fake TUN device)")
 	conf := EngineConfig{
 		Logf:       logf,
@@ -161,7 +148,6 @@ func NewFakeUserspaceEngine(logf logger.Logf, listenPort uint16, impl FakeImplFu
 		RouterGen:  router.NewFake,
 		ListenPort: listenPort,
 		Fake:       true,
-		FakeImpl:   impl,
 	}
 	return NewUserspaceEngineAdvanced(conf)
 }
@@ -223,6 +209,12 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) {
 	e.linkState, _ = getLinkState()
 	logf("link state: %+v", e.linkState)

+	// Respond to all pings only in fake mode.
+	if conf.Fake {
+		e.tundev.PostFilterIn = echoRespondToAll
+	}
+	e.tundev.PreFilterOut = e.handleLocalPackets
+
 	mon, err := monitor.New(logf, func() {
 		e.LinkChange(false)
 		tshttpproxy.InvalidateCache()
@@ -255,39 +247,9 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) {
 	}
 	e.magicConn.SetNetworkUp(e.linkState.AnyInterfaceUp())

-	// Respond to all pings only in fake mode.
-	if conf.Fake {
-		if impl := conf.FakeImpl; impl != nil {
-			if err := impl(logf, e.tundev, e, e.magicConn); err != nil {
-				return nil, err
-			}
-		} else {
-			// Respond to all pings only in fake mode.
-			e.tundev.PostFilterIn = echoRespondToAll
-		}
-	}
-	e.tundev.PreFilterOut = e.handleLocalPackets
-
-	if debugConnectFailures() {
-		if e.tundev.PreFilterIn != nil {
-			return nil, errors.New("unexpected PreFilterIn already set")
-		}
-		e.tundev.PreFilterIn = e.trackOpenPreFilterIn
-		if e.tundev.PostFilterOut != nil {
-			return nil, errors.New("unexpected PostFilterOut already set")
-		}
-		e.tundev.PostFilterOut = e.trackOpenPostFilterOut
-	}
-
-	// wireguard-go logs as it starts and stops routines.
-	// Silence those; there are a lot of them, and they're just noise.
-	allowLogf := func(s string) bool {
-		return !strings.Contains(s, "Routine:")
-	}
-	filtered := logger.Filtered(logf, allowLogf)
 	// flags==0 because logf is already nested in another logger.
 	// The outer one can display the preferred log prefixes, etc.
-	dlog := logger.StdLogger(filtered)
+	dlog := logger.StdLogger(logf)
 	logger := device.Logger{
 		Debug: dlog,
 		Info:  dlog,
@@ -296,7 +258,7 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) {

 	opts := &device.DeviceOptions{
 		Logger: &logger,
-		HandshakeDone: func(peerKey device.NoisePublicKey, peer *device.Peer, deviceAllowedIPs *device.AllowedIPs) {
+		HandshakeDone: func(peerKey wgcfg.Key, peer *device.Peer, deviceAllowedIPs *device.AllowedIPs) {
 			// Send an unsolicited status event every time a
 			// handshake completes. This makes sure our UI can
 			// update quickly as soon as it connects to a peer.
@@ -307,14 +269,13 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) {
 			// here.
 			go e.RequestStatus()

-			peerWGKey := wgkey.Key(peerKey)
 			if e.magicConn.PeerHasDiscoKey(tailcfg.NodeKey(peerKey)) {
-				e.logf("wireguard handshake complete for %v", peerWGKey.ShortString())
+				e.logf("wireguard handshake complete for %v", peerKey.ShortString())
 				// This is a modern peer with discovery support. No need to send pings.
 				return
 			}

-			e.logf("wireguard handshake complete for %v; sending legacy pings", peerWGKey.ShortString())
+			e.logf("wireguard handshake complete for %v; sending legacy pings", peerKey.ShortString())

 			// Ping every single-IP that peer routes.
 			// These synthetic packets are used to traverse NATs.
@@ -330,9 +291,9 @@ func newUserspaceEngineAdvanced(conf EngineConfig) (_ Engine, reterr error) {
 				}
 			}
 			if len(ips) > 0 {
-				go e.pinger(peerWGKey, ips)
+				go e.pinger(wgkey.Key(peerKey), ips)
 			} else {
-				logf("[unexpected] peer %s has no single-IP routes: %v", peerWGKey.ShortString(), allowedIPs)
+				logf("[unexpected] peer %s has no single-IP routes: %v", peerKey.ShortString(), allowedIPs)
 			}
 		},
 		CreateBind:     e.magicConn.CreateBind,
@@ -675,15 +636,10 @@ func isTrimmablePeer(p *wgcfg.Peer, numPeers int) bool {
 	if forceFullWireguardConfig(numPeers) {
 		return false
 	}
-	if !isSingleEndpoint(p.Endpoints) {
+	if len(p.Endpoints) != 1 {
 		return false
 	}
-
-	host, _, err := net.SplitHostPort(p.Endpoints)
-	if err != nil {
-		return false
-	}
-	if !strings.HasSuffix(host, ".disco.tailscale") {
+	if !strings.HasSuffix(p.Endpoints[0].Host, ".disco.tailscale") {
 		return false
 	}

@@ -747,14 +703,11 @@ func (e *userspaceEngine) isActiveSince(dk tailcfg.DiscoKey, ip netaddr.IP, t ti
 // Host of form "<64-hex-digits>.disco.tailscale". If invariant is violated,
 // we return the zero value.
 func discoKeyFromPeer(p *wgcfg.Peer) tailcfg.DiscoKey {
-	if len(p.Endpoints) < 64 {
+	host := p.Endpoints[0].Host
+	if len(host) < 64 {
 		return tailcfg.DiscoKey{}
 	}
-	host, rest := p.Endpoints[:64], p.Endpoints[64:]
-	if !strings.HasPrefix(rest, ".disco.tailscale") {
-		return tailcfg.DiscoKey{}
-	}
-	k, err := key.NewPublicFromHexMem(mem.S(host))
+	k, err := key.NewPublicFromHexMem(mem.S(host[:64]))
 	if err != nil {
 		return tailcfg.DiscoKey{}
 	}
@@ -807,14 +760,11 @@ func (e *userspaceEngine) maybeReconfigWireguardLocked(discoChanged map[key.Publ
 			}
 			continue
 		}
+		tsIP := p.AllowedIPs[0].IP
 		dk := discoKeyFromPeer(p)
 		trackDisco = append(trackDisco, dk)
-		recentlyActive := false
-		for _, cidr := range p.AllowedIPs {
-			trackIPs = append(trackIPs, cidr.IP)
-			recentlyActive = recentlyActive || e.isActiveSince(dk, cidr.IP, activeCutoff)
-		}
-		if recentlyActive {
+		trackIPs = append(trackIPs, tsIP)
+		if e.isActiveSince(dk, tsIP, activeCutoff) {
 			min.Peers = append(min.Peers, *p)
 			if discoChanged[key.Public(p.PublicKey)] {
 				needRemoveStep = true
@@ -958,21 +908,21 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config)
 	// and a second time with it.
 	discoChanged := make(map[key.Public]bool)
 	{
-		prevEP := make(map[key.Public]string)
+		prevEP := make(map[key.Public]wgcfg.Endpoint)
 		for i := range e.lastCfgFull.Peers {
-			if p := &e.lastCfgFull.Peers[i]; isSingleEndpoint(p.Endpoints) {
-				prevEP[key.Public(p.PublicKey)] = p.Endpoints
+			if p := &e.lastCfgFull.Peers[i]; len(p.Endpoints) == 1 {
+				prevEP[key.Public(p.PublicKey)] = p.Endpoints[0]
 			}
 		}
 		for i := range cfg.Peers {
 			p := &cfg.Peers[i]
-			if !isSingleEndpoint(p.Endpoints) {
+			if len(p.Endpoints) != 1 {
 				continue
 			}
 			pub := key.Public(p.PublicKey)
-			if old, ok := prevEP[pub]; ok && old != p.Endpoints {
+			if old, ok := prevEP[pub]; ok && old != p.Endpoints[0] {
 				discoChanged[pub] = true
-				e.logf("wgengine: Reconfig: %s changed from %q to %q", pub.ShortString(), old, p.Endpoints)
+				e.logf("wgengine: Reconfig: %s changed from %s to %s", pub.ShortString(), &old, &p.Endpoints[0])
 			}
 		}
 	}
@@ -1017,11 +967,6 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config)
 	return nil
 }

-// isSingleEndpoint reports whether endpoints contains exactly one host:port pair.
-func isSingleEndpoint(s string) bool {
-	return s != "" && !strings.Contains(s, ",")
-}
-
 func (e *userspaceEngine) GetFilter() *filter.Filter {
 	return e.tundev.GetFilter()
 }
@@ -1294,21 +1239,6 @@ func (e *userspaceEngine) SetLinkChangeCallback(cb func(major bool, newState *in
 	}
 }

-func (e *userspaceEngine) AddNetworkMapCallback(cb NetworkMapCallback) func() {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-	if e.networkMapCallbacks == nil {
-		e.networkMapCallbacks = make(map[*someHandle]NetworkMapCallback)
-	}
-	h := new(someHandle)
-	e.networkMapCallbacks[h] = cb
-	return func() {
-		e.mu.Lock()
-		defer e.mu.Unlock()
-		delete(e.networkMapCallbacks, h)
-	}
-}
-
 func getLinkState() (*interfaces.State, error) {
 	s, err := interfaces.GetState()
 	if s != nil {
@@ -1327,15 +1257,6 @@ func (e *userspaceEngine) SetDERPMap(dm *tailcfg.DERPMap) {

 func (e *userspaceEngine) SetNetworkMap(nm *controlclient.NetworkMap) {
 	e.magicConn.SetNetworkMap(nm)
-	e.mu.Lock()
-	callbacks := make([]NetworkMapCallback, 0, 4)
-	for _, fn := range e.networkMapCallbacks {
-		callbacks = append(callbacks, fn)
-	}
-	e.mu.Unlock()
-	for _, fn := range callbacks {
-		fn(nm)
-	}
 }

 func (e *userspaceEngine) DiscoPublicKey() tailcfg.DiscoKey {
--- a/wgengine/userspace_test.go
+++ b/wgengine/userspace_test.go
@@ -84,7 +84,7 @@ func TestNoteReceiveActivity(t *testing.T) {
 }

 func TestUserspaceEngineReconfig(t *testing.T) {
-	e, err := NewFakeUserspaceEngine(t.Logf, 0, nil)
+	e, err := NewFakeUserspaceEngine(t.Logf, 0)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -103,7 +103,12 @@ func TestUserspaceEngineReconfig(t *testing.T) {
 					AllowedIPs: []netaddr.IPPrefix{
 						{IP: netaddr.IPv4(100, 100, 99, 1), Bits: 32},
 					},
-					Endpoints: discoHex + ".disco.tailscale:12345",
+					Endpoints: []wgcfg.Endpoint{
+						{
+							Host: discoHex + ".disco.tailscale",
+							Port: 12345,
+						},
+					},
 				},
 			},
 		}
--- a/wgengine/watchdog.go
+++ b/wgengine/watchdog.go
@@ -110,11 +110,6 @@ func (e *watchdogEngine) SetDERPMap(m *tailcfg.DERPMap) {
 func (e *watchdogEngine) SetNetworkMap(nm *controlclient.NetworkMap) {
 	e.watchdog("SetNetworkMap", func() { e.wrap.SetNetworkMap(nm) })
 }
-func (e *watchdogEngine) AddNetworkMapCallback(callback NetworkMapCallback) func() {
-	var fn func()
-	e.watchdog("AddNetworkMapCallback", func() { fn = e.wrap.AddNetworkMapCallback(callback) })
-	return func() { e.watchdog("RemoveNetworkMapCallback", fn) }
-}
 func (e *watchdogEngine) DiscoPublicKey() (k tailcfg.DiscoKey) {
 	e.watchdog("DiscoPublicKey", func() { k = e.wrap.DiscoPublicKey() })
 	return k
--- a/wgengine/watchdog_test.go
+++ b/wgengine/watchdog_test.go
@@ -17,7 +17,7 @@ func TestWatchdog(t *testing.T) {

 	t.Run("default watchdog does not fire", func(t *testing.T) {
 		t.Parallel()
-		e, err := NewFakeUserspaceEngine(t.Logf, 0, nil)
+		e, err := NewFakeUserspaceEngine(t.Logf, 0)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -35,7 +35,7 @@ func TestWatchdog(t *testing.T) {

 	t.Run("watchdog fires on blocked getStatus", func(t *testing.T) {
 		t.Parallel()
-		e, err := NewFakeUserspaceEngine(t.Logf, 0, nil)
+		e, err := NewFakeUserspaceEngine(t.Logf, 0)
 		if err != nil {
 			t.Fatal(err)
 		}
--- a/wgengine/wgengine.go
+++ b/wgengine/wgengine.go
@@ -36,7 +36,7 @@ type PeerStatus struct {
 // TODO(bradfitz): remove this, subset of ipnstate? Need to migrate users.
 type Status struct {
 	Peers      []PeerStatus
-	LocalAddrs []string // the set of possible endpoints for the magic conn
+	LocalAddrs []string // TODO(crawshaw): []wgcfg.Endpoint?
 	DERPs      int      // number of active DERP connections
 }

@@ -49,15 +49,6 @@ type StatusCallback func(*Status, error)
 // NetInfoCallback is the type used by Engine.SetNetInfoCallback.
 type NetInfoCallback func(*tailcfg.NetInfo)

-// NetworkMapCallback is the type used by callbacks that hook
-// into network map updates.
-type NetworkMapCallback func(*controlclient.NetworkMap)
-
-// someHandle is allocated so its pointer address acts as a unique
-// map key handle. (It needs to have non-zero size for Go to guarantee
-// the pointer is unique.)
-type someHandle struct{ _ byte }
-
 // ErrNoChanges is returned by Engine.Reconfig if no changes were made.
 var ErrNoChanges = errors.New("no changes made to Engine config")

@@ -123,12 +114,6 @@ type Engine interface {
 	// The network map should only be read from.
 	SetNetworkMap(*controlclient.NetworkMap)

-	// AddNetworkMapCallback adds a function to a list of callbacks
-	// that are called when the network map updates. It returns a
-	// function that when called would remove the function from the
-	// list of callbacks.
-	AddNetworkMapCallback(NetworkMapCallback) (removeCallback func())
-
 	// SetNetInfoCallback sets the function to call when a
 	// new NetInfo summary is available.
 	SetNetInfoCallback(NetInfoCallback)
Author	SHA1	Message	Date
Christina Wen	77f1591d68	API.md: revise documentation to be more consistent Signed-off-by: Christina Wen <christina@tailscale.com>	2021-01-05 14:28:14 -05:00
Christina Wen	309d113f93	API.md: release API documentation Co-authored-by: Daniel Chung <daniel@tailscale.com> Signed-off-by: Christina Wen <christina@tailscale.com>	2021-01-05 13:37:11 -05:00