From: Guus Sliepen Date: Tue, 2 Feb 2010 21:22:27 +0000 (+0100) Subject: Try to set DF bit on BSDs as well. X-Git-Tag: release-1.0.12~3 X-Git-Url: https://git.tinc-vpn.org/git/browse?a=commitdiff_plain;h=44f8f61396a92c899172a1863bbc9c705cbfa649;p=tinc Try to set DF bit on BSDs as well. 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. --- diff --git a/src/net_socket.c b/src/net_socket.c index cd41e37b..9538806f 100644 --- a/src/net_socket.c +++ b/src/net_socket.c @@ -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)) {