diff options
Diffstat (limited to 'ripd/ripd.c')
| -rw-r--r-- | ripd/ripd.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/ripd/ripd.c b/ripd/ripd.c index 22777e50..dd9427c5 100644 --- a/ripd/ripd.c +++ b/ripd/ripd.c @@ -387,7 +387,7 @@ rip_rte_process (struct rte *rte, struct sockaddr_in *from, int ret; struct prefix_ipv4 p; struct route_node *rp; - struct rip_info *rinfo; + struct rip_info *rinfo, rinfotmp; struct rip_interface *ri; struct in_addr *nexthop; u_char oldmetric; @@ -560,13 +560,27 @@ rip_rte_process (struct rte *rte, struct sockaddr_in *from, if (same) rip_timeout_update (rinfo); + + /* Fill in a minimaly temporary rip_info structure, for a future + rip_distance_apply() use) */ + memset (&rinfo,0,sizeof(rinfotmp)); + IPV4_ADDR_COPY (&rinfotmp.from, &from->sin_addr); + rinfotmp.rp=rinfo->rp; + + /* Next, compare the metrics. If the datagram is from the same router as the existing route, and the new metric is different than the old one; or, if the new metric is lower than the old - one, or if the tag has been changed; do the following actions: */ - if ((same && rinfo->metric != rte->metric) || - (rte->metric < rinfo->metric) || - (same && (rinfo->metric == rte->metric) && ntohs(rte->tag) != rinfo->tag)) + one, or if the tag has been changed; or if there is a route + with a lower administrave distance; or an update of the + distance on the actual route; do the following actions: */ + if (( same && rinfo->metric != rte->metric ) + || ( rte->metric < rinfo->metric ) + || ( (same) + && (rinfo->metric == rte->metric) + && ntohs(rte->tag) != rinfo->tag ) + || ( rinfo->distance > rip_distance_apply (&rinfotmp) ) + || ( (rinfo->distance != rip_distance_apply (rinfo)) && same )) { /* - Adopt the route from the datagram. That is, put the new metric in, and adjust the next hop address (if |