diff options
Diffstat (limited to 'sys/netinet/ip_icmp.c')
| -rw-r--r-- | sys/netinet/ip_icmp.c | 46 |
1 files changed, 1 insertions, 45 deletions
diff --git a/sys/netinet/ip_icmp.c b/sys/netinet/ip_icmp.c index 4547886..c57b684 100644 --- a/sys/netinet/ip_icmp.c +++ b/sys/netinet/ip_icmp.c @@ -125,7 +125,6 @@ int icmpprintfs = 0; static void icmp_reflect(struct mbuf *); static void icmp_send(struct mbuf *, struct mbuf *); -static int ip_next_mtu(int, int); extern struct protosw inetsw[]; @@ -407,49 +406,6 @@ icmp_input(m, off) printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); #endif icmpsrc.sin_addr = icp->icmp_ip.ip_dst; - - /* - * MTU discovery: - * If we got a needfrag and there is a host route to the - * original destination, and the MTU is not locked, then - * set the MTU in the route to the suggested new value - * (if given) and then notify as usual. The ULPs will - * notice that the MTU has changed and adapt accordingly. - * If no new MTU was suggested, then we guess a new one - * less than the current value. If the new MTU is - * unreasonably small (defined by sysctl tcp_minmss), then - * we don't update the MTU value. - * - * XXX: All this should be done in tcp_mtudisc() because - * the way we do it now, everyone can send us bogus ICMP - * MSGSIZE packets for any destination. By doing this far - * higher in the chain we have a matching tcp connection. - * Thus spoofing is much harder. However there is no easy - * non-hackish way to pass the new MTU up to tcp_mtudisc(). - * Also see next XXX regarding IPv4 AH TCP. - */ - if (code == PRC_MSGSIZE) { - int mtu; - struct in_conninfo inc; - - bzero(&inc, sizeof(inc)); - inc.inc_flags = 0; /* IPv4 */ - inc.inc_faddr = icmpsrc.sin_addr; - - mtu = ntohs(icp->icmp_nextmtu); - if (!mtu) - mtu = ip_next_mtu(mtu, 1); - - if (mtu >= max(296, (tcp_minmss + - sizeof(struct tcpiphdr)))) - tcp_hc_updatemtu(&inc, mtu); - -#ifdef DEBUG_MTUDISC - printf("MTU for %s reduced to %d\n", - inet_ntoa(icmpsrc.sin_addr), mtu); -#endif - } - /* * XXX if the packet contains [IPv4 AH TCP], we can't make a * notification to TCP layer. @@ -831,7 +787,7 @@ iptime() * given current value MTU. If DIR is less than zero, a larger plateau * is returned; otherwise, a smaller value is returned. */ -static int +int ip_next_mtu(mtu, dir) int mtu; int dir; |
