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wgengine/magicsock: fix don't fragment setsockopt arg for IPv6 on linux

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Use IPV6_MTU_DISCOVER for setting don't fragment on IPv6 sockets on Linux (was
using IP_MTU_DISCOVER, the IPv4 arg).

Updates #311

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val 2023-09-14 17:49:53 +02:00 committed by valscale
parent 055f3fd843
commit 4c793014af
1 changed files with 1 additions and 1 deletions
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2
wgengine/magicsock/peermtu_linux.go
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@ -21,7 +21,7 @@ func setDontFragment(pconn nettype.PacketConn, network string) (err error) {
err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_DO)
}
if network == "udp6" {
err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_DO)
err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_MTU_DISCOVER, syscall.IP_PMTUDISC_DO)
}
})
}