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Try to set DF bit on BSDs as well.

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Every operating system seems to have its own, slightly different way to disable
packet fragmentation. Emit a compiler warning when no suitable way is found.
On OpenBSD, it seems impossible to do it for IPv4.
This commit is contained in:
Guus Sliepen 2010-02-02 22:22:27 +01:00
parent ed14ef93b4
commit 44f8f61396
1 changed files with 15 additions and 2 deletions
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17
src/net_socket.c
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@ -261,9 +261,13 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, &option, sizeof option);
#endif
#if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
#define IP_DONTFRAGMENT IP_DONTFRAG
#endif
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
@ -276,6 +280,8 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
option = 1;
setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, &option, sizeof(option));
}
#else
#warning No way to disable IPv4 fragmentation
#endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
@ -283,6 +289,13 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
option = IPV6_PMTUDISC_DO;
setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
}
#elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, &option, sizeof(option));
}
#else
#warning No way to disable IPv6 fragmentation
#endif
if (!bind_to_interface(nfd)) {