diff options
Diffstat (limited to 'sys/netinet/ip_output.c')
| -rw-r--r-- | sys/netinet/ip_output.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c index c6ca2c6e493..dfd4cc19d63 100644 --- a/sys/netinet/ip_output.c +++ b/sys/netinet/ip_output.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ip_output.c,v 1.105 2001/06/23 02:27:10 angelos Exp $ */ +/* $OpenBSD: ip_output.c,v 1.106 2001/06/23 03:10:21 provos Exp $ */ /* $NetBSD: ip_output.c,v 1.28 1996/02/13 23:43:07 christos Exp $ */ /* @@ -621,6 +621,18 @@ sendit: */ if (ip->ip_off & IP_DF) { error = EMSGSIZE; + /* + * This case can happen if the user changed the MTU + * of an interface after enabling IP on it. Because + * most netifs don't keep track of routes pointing to + * them, there is no way for one to update all its + * routes when the MTU is changed. + */ + if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) + && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) + && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { + ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; + } ipstat.ips_cantfrag++; goto bad; } |