void/amneziawg-go
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Add disabling UDP GSO when an error occurs due to inconsistent peer mtu

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albexk 2024-04-03 18:42:37 +03:00 • committed by pokamest
parent 3ddf952973
commit e433d13df6
2 changed files with 4 additions and 2 deletions
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2
conn/bind_std.go
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@ -336,7 +336,7 @@ type ErrUDPGSODisabled struct {
}
func (e ErrUDPGSODisabled) Error() string {
return fmt.Sprintf("disabled UDP GSO on %s, NIC(s) may not support checksum offload", e.onLaddr)
return fmt.Sprintf("disabled UDP GSO on %s, NIC(s) may not support checksum offload or peer MTU with protocol headers is greater than path MTU", e.onLaddr)
}
func (e ErrUDPGSODisabled) Unwrap() error {

4
conn/errors_linux.go
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@ -20,7 +20,9 @@ func errShouldDisableUDPGSO(err error) bool {
// See:
// https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man7/udp.7?id=806eabd74910447f21005160e90957bde4db0183#n228
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/udp.c?h=v6.2&id=c9c3395d5e3dcc6daee66c6908354d47bf98cb0c#n942
return serr.Err == unix.EIO
// If gso_size + udp + ip headers > fragment size EINVAL is returned.
// It occurs when the peer mtu + wg headers is greater than path mtu.
return serr.Err == unix.EIO || serr.Err == unix.EINVAL
}
return false
}