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plumb ECN through via relays

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This commit is contained in:
JackDoan
2026-07-31 12:14:56 -05:00
parent b3002c2d13
commit b7bf32240b
18 changed files with 282 additions and 79 deletions
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udp/conn.go
+10 -7
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@@ -35,13 +35,16 @@ type EncReader func(
type Conn interface {
Rebind() error
LocalAddr() (netip.AddrPort, error)
// ListenOut invokes r for each received packet. On batch-capable
// backends (recvmmsg), flush is called after each batch is fully
// delivered — callers use it to flush per-batch accumulators such as
// TUN write coalescers. Single-packet backends call flush after each
// packet. flush must not be nil.
// ListenOut invokes r for each received packet.
// On batch-capable backends (recvmmsg), flush is called after each batch is fully delivered.
// Callers use it to flush per-batch accumulators such as TUN write coalescers.
// Single-packet backends call flush after each packet. flush must not be nil.
ListenOut(r EncReader, flush func()) error
WriteTo(b []byte, addr netip.AddrPort) error
// WriteTo sends a single packet to addr.
// outerECN is the 2-bit IP-level ECN codepoint to stamp on the packet's outer IP header.
// 0 (Not-ECT) is the pass-through value.
// Linux attaches it as an IP_TOS / IPV6_TCLASS cmsg. Backends without per-packet ECN support ignore it.
WriteTo(b []byte, addr netip.AddrPort, outerECN byte) error
// WriteBatch sends a contiguous batch of packets, each with its own
// destination. bufs and addrs must have the same length. outerECNs may
// be nil (treated as all-zero / Not-ECT); when non-nil it must have the
@@ -73,7 +76,7 @@ func (NoopConn) ListenOut(_ EncReader, _ func()) error {
func (NoopConn) SupportsMultipleReaders() bool {
return false
}
func (NoopConn) WriteTo(_ []byte, _ netip.AddrPort) error {
func (NoopConn) WriteTo(_ []byte, _ netip.AddrPort, _ byte) error {
return nil
}
func (NoopConn) WriteBatch(bufs [][]byte, _ []netip.AddrPort, _ []byte) (int, error) {