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wgengine/magicsock: remove noV4/noV6 check in addrForSendWireGuardLocked

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This change removes the noV4/noV6 check from addrForSendWireGuardLocked.

On Android, the client panics when reaching	`rand.Intn()`, likely due to
the candidates list being containing no candidates. The suspicion is
that the `noV4` and the `noV6` are both being triggered causing the
loop to continue.

Updates tailscale/corp#12938
Updates #7826

Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>
This commit is contained in:
Charlotte Brandhorst-Satzkorn
2023-07-06 11:11:21 -07:00
committed by Charlotte Brandhorst-Satzkorn
parent 9d1a3a995c
commit 339397ab74
2 changed files with 6 additions and 41 deletions
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15
wgengine/magicsock/magicsock.go
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@@ -30,6 +30,7 @@ import (
"github.com/tailscale/wireguard-go/conn"
"go4.org/mem"
"golang.org/x/exp/maps"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"tailscale.com/control/controlclient"
@@ -4409,16 +4410,12 @@ func (de *endpoint) addrForWireGuardSendLocked(now mono.Time) (udpAddr netip.Add
return udpAddr, false
}
candidates := make([]netip.AddrPort, 0, len(de.endpointState))
for ipp := range de.endpointState {
if ipp.Addr().Is4() && de.c.noV4.Load() {
continue
}
if ipp.Addr().Is6() && de.c.noV6.Load() {
continue
}
candidates = append(candidates, ipp)
candidates := maps.Keys(de.endpointState)
if len(candidates) == 0 {
de.c.logf("magicsock: addrForSendWireguardLocked: [unexpected] no candidates available for endpoint")
return udpAddr, false
}
// Randomly select an address to use until we retrieve latency information
// and give it a short trustBestAddrUntil time so we avoid flapping between
// addresses while waiting on latency information to be populated.