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PMTUD exploration, start small then grow

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This commit is contained in:
Nate Brown
2026-05-05 17:05:50 -05:00
parent 33c2d7277c
commit 16a836a73f
33 changed files with 1036 additions and 11 deletions
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11
udp/udp_darwin.go
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@@ -187,6 +187,17 @@ func (u *StdConn) SupportsMultipleReaders() bool {
return false
}
// EnablePathMTUDiscovery sets the don't-fragment bit on every outbound packet.
// On darwin we use IP_DONTFRAG (v4) / IPV6_DONTFRAG (v6). The kernel will return
// EMSGSIZE for sends that exceed the local interface MTU; ICMP-driven PMTU
// updates from upstream routers are processed by the kernel as usual.
func (u *StdConn) EnablePathMTUDiscovery() error {
if u.isV4 {
return syscall.SetsockoptInt(int(u.sysFd), syscall.IPPROTO_IP, unix.IP_DONTFRAG, 1)
}
return syscall.SetsockoptInt(int(u.sysFd), syscall.IPPROTO_IPV6, unix.IPV6_DONTFRAG, 1)
}
func (u *StdConn) Rebind() error {
var err error
if u.isV4 {