TheArchive/tailscale
1
0
Fork 0
mirror of https://github.com/tailscale/tailscale.git synced 2025-08-11 13:18:53 +00:00
Code Issues Packages Projects Releases Wiki Activity

all: avoid repeated default interface lookups

Browse Source 
On some platforms (notably macOS and iOS) we look up the default
interface to bind outgoing connections to. This is both duplicated
work and results in logspam when the default interface is not available
(i.e. when a phone has no connectivity, we log an error and thus cause
more things that we will try to upload and fail).

Fixed by passing around a netmon.Monitor to more places, so that we can
use its cached interface state.

Fixes #7850
Updates #7621

Signed-off-by: Mihai Parparita <mihai@tailscale.com>
This commit is contained in:
Mihai Parparita
2023-04-17 16:01:41 -07:00
committed by Mihai Parparita
parent 7f17e04a5a
commit 7330aa593e
50 changed files with 242 additions and 126 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
derp/derphttp/derphttp_client.go
View File

@@ -31,6 +31,7 @@ import (
"tailscale.com/derp"
"tailscale.com/envknob"
"tailscale.com/net/dnscache"
"tailscale.com/net/netmon"
"tailscale.com/net/netns"
"tailscale.com/net/sockstats"
"tailscale.com/net/tlsdial"
@@ -55,6 +56,7 @@ type Client struct {
privateKey key.NodePrivate
logf logger.Logf
netMon *netmon.Monitor // optional; nil means interfaces will be looked up on-demand
dialer func(ctx context.Context, network, addr string) (net.Conn, error)
// Either url or getRegion is non-nil:
@@ -88,11 +90,13 @@ func (c *Client) String() string {
// NewRegionClient returns a new DERP-over-HTTP client. It connects lazily.
// To trigger a connection, use Connect.
func NewRegionClient(privateKey key.NodePrivate, logf logger.Logf, getRegion func() *tailcfg.DERPRegion) *Client {
// The netMon parameter is optional; if non-nil it's used to do faster interface lookups.
func NewRegionClient(privateKey key.NodePrivate, logf logger.Logf, netMon *netmon.Monitor, getRegion func() *tailcfg.DERPRegion) *Client {
ctx, cancel := context.WithCancel(context.Background())
c := &Client{
privateKey: privateKey,
logf: logf,
netMon: netMon,
getRegion: getRegion,
ctx: ctx,
cancelCtx: cancel,
@@ -492,7 +496,7 @@ func (c *Client) dialURL(ctx context.Context) (net.Conn, error) {
return c.dialer(ctx, "tcp", net.JoinHostPort(host, urlPort(c.url)))
}
hostOrIP := host
dialer := netns.NewDialer(c.logf)
dialer := netns.NewDialer(c.logf, c.netMon)
if c.DNSCache != nil {
ip, _, _, err := c.DNSCache.LookupIP(ctx, host)
@@ -587,7 +591,7 @@ func (c *Client) DialRegionTLS(ctx context.Context, reg *tailcfg.DERPRegion) (tl
}
func (c *Client) dialContext(ctx context.Context, proto, addr string) (net.Conn, error) {
return netns.NewDialer(c.logf).DialContext(ctx, proto, addr)
return netns.NewDialer(c.logf, c.netMon).DialContext(ctx, proto, addr)
}
// shouldDialProto reports whether an explicitly provided IPv4 or IPv6