Author: ae
Date: Thu Feb 6 10:48:55 2014
New Revision: 261545
URL: http://svnweb.freebsd.org/changeset/base/261545
Log:
MFC r260702 (by melifaro):
Fix ipfw fwd for IPv4 traffic broken by r249894.
Problem case:
Original lookup returns route with GW set, so gw points to
rte->rt_gateway.
After that we're changing dst and performing lookup another time.
Since fwd host is most probably directly reachable, resulting
rte does not contain rt_gateway, so gw is not set. Finally, we
end with packet transmitted to proper interface but wrong
link-layer address.
Modified:
stable/10/sys/netinet/ip_output.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/netinet/ip_output.c
==============================================================================
--- stable/10/sys/netinet/ip_output.c Thu Feb 6 10:47:47 2014
(r261544)
+++ stable/10/sys/netinet/ip_output.c Thu Feb 6 10:48:55 2014
(r261545)
@@ -200,6 +200,13 @@ ip_output(struct mbuf *m, struct mbuf *o
hlen = ip->ip_hl << 2;
}
+ /*
+ * dst/gw handling:
+ *
+ * dst can be rewritten but always point to &ro->ro_dst
+ * gw is readonly but can be pointed either to dst OR rt_gatewy
+ * therefore we need restore GW if we're re-doing lookup
+ */
gw = dst = (struct sockaddr_in *)&ro->ro_dst;
again:
ia = NULL;
@@ -219,6 +226,7 @@ again:
RO_RTFREE(ro);
ro->ro_lle = NULL;
rte = NULL;
+ gw = dst;
}
if (rte == NULL && fwd_tag == NULL) {
bzero(dst, sizeof(*dst));
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
