diff options
Diffstat (limited to 'sys/netinet/ip_icmp.c')
| -rw-r--r-- | sys/netinet/ip_icmp.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/ip_icmp.c b/sys/netinet/ip_icmp.c index a4e0a96..220c624 100644 --- a/sys/netinet/ip_icmp.c +++ b/sys/netinet/ip_icmp.c @@ -409,7 +409,8 @@ icmp_input(m, off) * 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, then we don't update the MTU value. + * 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 @@ -431,7 +432,8 @@ icmp_input(m, off) if (!mtu) mtu = ip_next_mtu(mtu, 1); - if (mtu >= 256 + sizeof(struct tcpiphdr)) + if (mtu >= max(296, (tcp_minmss + + sizeof(struct tcpiphdr)))) tcp_hc_updatemtu(&inc, mtu); #ifdef DEBUG_MTUDISC |
