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tailscale/ipn
Dmytro Shynkevych 33b2f30cea
wgengine: wrap tun.Device to support filtering and packet injection (#358)
Right now, filtering and packet injection in wgengine depend
on a patch to wireguard-go that probably isn't suitable for upstreaming.

This need not be the case: wireguard-go/tun.Device is an interface.
For example, faketun.go implements it to mock a TUN device for testing.

This patch implements the same interface to provide filtering
and packet injection at the tunnel device level,
at which point the wireguard-go patch should no longer be necessary.

This patch has the following performance impact on i7-7500U @ 2.70GHz,
tested in the following namespace configuration:
┌────────────────┐    ┌─────────────────────────────────┐     ┌────────────────┐
│      $ns1      │    │               $ns0              │     │      $ns2      │
│    client0     │    │      tailcontrol, logcatcher    │     │     client1    │
│  ┌─────┐       │    │  ┌──────┐         ┌──────┐      │     │  ┌─────┐       │
│  │vethc│───────┼────┼──│vethrc│         │vethrs│──────┼─────┼──│veths│       │
│  ├─────┴─────┐ │    │  ├──────┴────┐    ├──────┴────┐ │     │  ├─────┴─────┐ │
│  │10.0.0.2/24│ │    │  │10.0.0.1/24│    │10.0.1.1/24│ │     │  │10.0.1.2/24│ │
│  └───────────┘ │    │  └───────────┘    └───────────┘ │     │  └───────────┘ │
└────────────────┘    └─────────────────────────────────┘     └────────────────┘
Before:
---------------------------------------------------
| TCP send               | UDP send               |
|------------------------|------------------------|
| 557.0 (±8.5) Mbits/sec | 3.03 (±0.02) Gbits/sec |
---------------------------------------------------
After:
---------------------------------------------------
| TCP send               | UDP send               |
|------------------------|------------------------|
| 544.8 (±1.6) Mbits/sec | 3.13 (±0.02) Gbits/sec |
---------------------------------------------------
The impact on receive performance is similar.

Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
6 years ago
..
ipnserver Implement rate limiting on log messages (#356) 6 years ago
ipnstate ipn/ipnstate: improve HTML output 6 years ago
policy ipn, ipn/policy: filter portlist to a short list of "interesting" ports 6 years ago
backend.go ipn, wgengine/filter: remove exported type aliases 6 years ago
doc.go Move Linux client & common packages into a public repo. 6 years ago
e2e_test.go wgengine: wrap tun.Device to support filtering and packet injection (#358) 6 years ago
fake_test.go ipn, wgengine/filter: remove exported type aliases 6 years ago
handle.go ipn, wgengine/filter: remove exported type aliases 6 years ago
local.go wgengine/router: rename config.Settings to config.Config, make pointer. 6 years ago
message.go ipn: add AllowVersionSkew bool to Notify & Message 6 years ago
message_test.go tstest: rename from testy. 6 years ago
prefs.go wgengine/router: add a setting to disable SNAT for subnet routes. 6 years ago
prefs_test.go wgengine/router: add a setting to disable SNAT for subnet routes. 6 years ago
store.go ipn: have NewFileStore try to create directories as needed 6 years ago
store_test.go Introduce a state store to LocalBackend. 6 years ago