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chore(pmtud/tcp): close connections with an RST packet on context cancelation

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This commit is contained in:
Quentin McGaw
2026-02-19 12:22:42 +00:00
parent bc79901f1e
commit 783616f61d
1 changed files with 4 additions and 1 deletions
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internal/pmtud/tcp/tcp.go
+4 -1
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@@ -107,6 +107,7 @@ func runTest(ctx context.Context, dst netip.AddrPort, mtu uint32,
var reply []byte
select {
case <-ctx.Done():
_ = sendRST(fd, src, dst, synSeq+1)
return ctx.Err()
case reply = <-ch:
}
@@ -149,6 +150,7 @@ func runTest(ctx context.Context, dst netip.AddrPort, mtu uint32,
select {
case <-ctx.Done():
_ = sendRST(fd, src, dst, firstReplyHeader.ack)
return ctx.Err()
case reply = <-ch:
}
@@ -180,7 +182,7 @@ var errTCPPacketNotRST = errors.New("TCP packet is not an RST")
func handleRSTReply(ctx context.Context, fd fileDescriptor, ch <-chan []byte,
src, dst netip.AddrPort, mtu uint32,
) error {
packet, _ := createSYNPacket(src, dst, mtu)
packet, synSeq := createSYNPacket(src, dst, mtu)
const sendToFlags = 0
err := sendTo(fd, packet, sendToFlags, makeSockAddr(dst))
if err != nil {
@@ -190,6 +192,7 @@ func handleRSTReply(ctx context.Context, fd fileDescriptor, ch <-chan []byte,
var reply []byte
select {
case <-ctx.Done():
_ = sendRST(fd, src, dst, synSeq+1)
return ctx.Err() // timeout: the MTU test SYN packet was too big
case reply = <-ch:
}