diff options
| author |   provos <provos@openbsd.org> | 2000-10-10 15:16:01 +0000 |
|---|---|---|
| committer | provos <provos@openbsd.org> | 2000-10-10 15:16:01 +0000 |
| commit | 1982d2b04f5bceb7f3bc3d2da1fb36139b5999eb (patch) | |
| tree | 27bdf3e9cdb6e4322bfd5ed72929006b7dc9e70d /sys/netinet/tcp_subr.c | |
| parent | Link with curses, not ocurses and use setupterm(). For now, telnet(1) (diff) | |
| download | wireguard-openbsd-1982d2b04f5bceb7f3bc3d2da1fb36139b5999eb.tar.xz wireguard-openbsd-1982d2b04f5bceb7f3bc3d2da1fb36139b5999eb.zip | |
verify payload of the icmp need fragment message at the tcp layer. okay itojun@
Diffstat (limited to 'sys/netinet/tcp_subr.c')
| -rw-r--r-- | sys/netinet/tcp_subr.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c index 836bda2197e..308e7f28a7a 100644 --- a/sys/netinet/tcp_subr.c +++ b/sys/netinet/tcp_subr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tcp_subr.c,v 1.33 2000/09/25 09:41:03 provos Exp $ */ +/* $OpenBSD: tcp_subr.c,v 1.34 2000/10/10 15:16:02 provos Exp $ */ /* $NetBSD: tcp_subr.c,v 1.22 1996/02/13 23:44:00 christos Exp $ */ /* @@ -87,6 +87,10 @@ didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>. #include <sys/md5k.h> #endif /* TCP_SIGNATURE */ +#ifndef offsetof +#define offsetof(type, member) ((size_t)(&((type *)0)->member)) +#endif + /* patchable/settable parameters for tcp */ int tcp_mssdflt = TCP_MSS; int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; @@ -809,9 +813,25 @@ tcp_ctlinput(cmd, sa, v) notify = tcp_quench; else if (PRC_IS_REDIRECT(cmd)) notify = in_rtchange, ip = 0; - else if (cmd == PRC_MSGSIZE && ip_mtudisc) + else if (cmd == PRC_MSGSIZE && ip_mtudisc) { + th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2)); + /* + * Verify that the packet in the icmp payload refers + * to an existing TCP connection. + */ + if (in_pcblookup(&tcbtable, + &ip->ip_dst, th->th_dport, + &ip->ip_src, th->th_sport, + INPLOOKUP_WILDCARD)) { + struct icmp *icp; + icp = (struct icmp *)((caddr_t)ip - + offsetof(struct icmp, icmp_ip)); + + /* Calculate new mtu and create corresponding route */ + icmp_mtudisc(icp); + } notify = tcp_mtudisc, ip = 0; - else if (cmd == PRC_MTUINC) + } else if (cmd == PRC_MTUINC) notify = tcp_mtudisc_increase, ip = 0; else if (cmd == PRC_HOSTDEAD) ip = 0; |