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disable GSO if sending fails for a particular remote address

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This commit is contained in:
Marten Seemann 2023-07-29 15:58:32 -07:00
parent 83c00a574d
commit 4122eb7a7d
15 changed files with 318 additions and 150 deletions
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30
sys_conn_helper_linux.go
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@ -4,8 +4,11 @@ package quic
import (
"encoding/binary"
"errors"
"net/netip"
"os"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
@ -48,3 +51,30 @@ func parseIPv4PktInfo(body []byte) (ip netip.Addr, ifIndex uint32, ok bool) {
}
return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.LittleEndian.Uint32(body), true
}
func appendUDPSegmentSizeMsg(b []byte, size uint16) []byte {
startLen := len(b)
const dataLen = 2 // payload is a uint16
b = append(b, make([]byte, unix.CmsgSpace(dataLen))...)
h := (*unix.Cmsghdr)(unsafe.Pointer(&b[startLen]))
h.Level = syscall.IPPROTO_UDP
h.Type = unix.UDP_SEGMENT
h.SetLen(unix.CmsgLen(dataLen))
// UnixRights uses the private `data` method, but I *think* this achieves the same goal.
offset := startLen + unix.CmsgSpace(0)
*(*uint16)(unsafe.Pointer(&b[offset])) = size
return b
}
func isGSOError(err error) bool {
var serr *os.SyscallError
if errors.As(err, &serr) {
// EIO is returned by udp_send_skb() if the device driver does not have tx checksums enabled,
// which is a hard requirement of UDP_SEGMENT. 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
}
return false
}