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- Fix to stop IPv6 PMTU discovery.

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W.C.A. Wijngaards 2021-04-01 13:45:34 +02:00
parent fb315509ab
commit fe324823f8
2 changed files with 38 additions and 0 deletions
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1
doc/Changelog
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@ -1,5 +1,6 @@
1 April 2021: Wouter
- Merge #460 from orbea: build: Link with the libtool archive.
- Fix to stop IPv6 PMTU discovery.
31 March 2021: George
- Clean makedist.sh.

37
services/listen_dnsport.c
View File

@ -452,6 +452,10 @@ create_udp_sock(int family, int socktype, struct sockaddr* addr,
if(err != NULL)
log_warn("error setting IP DiffServ codepoint %d on UDP socket: %s", dscp, err);
if(family == AF_INET6) {
# if defined(IPV6_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
int omit6_set = 0;
int action;
# endif
# if defined(IPV6_V6ONLY)
if(v6only) {
int val=(v6only==2)?0:1;
@ -500,6 +504,39 @@ create_udp_sock(int family, int socktype, struct sockaddr* addr,
return -1;
}
# endif /* IPv6 MTU */
# if defined(IPV6_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
# if defined(IP_PMTUDISC_OMIT)
action = IP_PMTUDISC_OMIT;
if (setsockopt(s, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
&action, (socklen_t)sizeof(action)) < 0) {
if (errno != EINVAL) {
log_err("setsockopt(..., IPV6_MTU_DISCOVER, IP_PMTUDISC_OMIT...) failed: %s",
strerror(errno));
sock_close(s);
*noproto = 0;
*inuse = 0;
return -1;
}
}
else
{
omit6_set = 1;
}
# endif
if (omit6_set == 0) {
action = IP_PMTUDISC_DONT;
if (setsockopt(s, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
&action, (socklen_t)sizeof(action)) < 0) {
log_err("setsockopt(..., IPV6_MTU_DISCOVER, IP_PMTUDISC_DONT...) failed: %s",
strerror(errno));
sock_close(s);
*noproto = 0;
*inuse = 0;
return -1;
}
}
# endif /* IPV6_MTU_DISCOVER */
} else if(family == AF_INET) {
# if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
/* linux 3.15 has IP_PMTUDISC_OMIT, Hannes Frederic Sowa made it so that