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authorJosh Bailey <joshb@google.com>2011-07-20 20:46:01 -0700
committerJosh Bailey <joshb@google.com>2011-07-20 20:46:01 -0700
commitde8d5dff1523bb9fe47d54f31c9e5322bd805b44 (patch)
tree95d71dffb32d9e67a2f892ac5689a884117dcbcd /bgpd/bgp_route.c
parent96450faf3385a6ed9f4dd5c2c58776c4a664a8da (diff)
bgpd: Adds support to mark up the BGP rib table entry with multipath
information based on the multipath list (mp_list) generated during the best path calculation. Display "multipath" for paths that are multipath and also on bestpath if the route is multipath. Flag a best path with the BGP_INFO_MULTIPATH_CHG if the multipath set has changed since the last update. This can be used to trigger updates to zebra and peers. The multipath markup is a lazily allocated bgp_info_mpath structure that is added to the best path and any multipaths. The mpath structures are linked together with the best path element at the head and the other elements ordered by nexthop and then by peer address. This markup scheme is updated by calling bgp_info_mpath_update() and passing in a new mp_list the the current multipath set. There are additional API's for walking the multipath set, querying the count of multipaths, and for cleaning up the multipath markup information when freeing path information. * bgpd/bgp_mpath.c * bgp_info_mpath_new(): Allocation of new mpath element * bgp_info_mpath_free(): Release memory for mpath element * bgp_info_mpath_get(): Access mpath element of path. Allocate memory on-demand * bgp_info_mpath_enqueue(): Enqueue a path onto the multipath list * bgp_info_mpath_dequeue(): Remove a path from the multipath list * bgp_info_mpath_first(): Return first path on the multipath list * bgp_info_mpath_next(): Return next path on the multipath list * bgp_info_mpath_count(): Return the number of paths on the multipath list * bgp_info_mpath_count_set(): Set the number of paths on the multipath list * bgp_info_mpath_update(): Update multipath markup on bgp route table entry and flag any changes. Emit 'debug bgp event' output on any multipath change. * bgpd/bgp_mpath.h * struct bgp_info_mpath: Information added to a bgp_info path to record multipath information * External declarations for new functions in bgp_mpath.c * bgpd/bgp_route.c * bgp_info_free(): Free mpath memory when freeing path information * bgp_info_reap(): Dequeue path from multipath queue before deleting it * bgp_best_selection(): Calls bgp_info_mpath_update() with latest mp_list to mark-up rib table entry * bgp_vty_out_detail(): Add display of multipath flag for a path. Also display 'multipath' for bestpath if it is a multipath route * bgpd/bgp_route.h * struct bgp_info: Add pointer to bgp_info_mpath information * Add flags to mark a path as multipath (BGP_INFO_MULTIPATH) and to mark bestpath if multipath information has changed (BGP_INFO_MULTIPATH_CHG) * lib/memtypes.c * Add MTYPE_BGP_MPATH_INFO for allocating memory for bgp_info_mpath * tests/bgp_mpath_test.c * Add test case for bgp_info_mpath_update() and supporting functions
Diffstat (limited to 'bgpd/bgp_route.c')
-rw-r--r--bgpd/bgp_route.c37
1 files changed, 8 insertions, 29 deletions
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 718e25ff..ec17dc61 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -141,6 +141,7 @@ bgp_info_free (struct bgp_info *binfo)
bgp_attr_unintern (binfo->attr);
bgp_info_extra_free (&binfo->extra);
+ bgp_info_mpath_free (&binfo->mpath);
peer_unlock (binfo->peer); /* bgp_info peer reference */
@@ -211,6 +212,7 @@ bgp_info_reap (struct bgp_node *rn, struct bgp_info *ri)
else
rn->info = ri->next;
+ bgp_info_mpath_dequeue (ri);
bgp_info_unlock (ri);
bgp_unlock_node (rn);
}
@@ -1384,35 +1386,7 @@ bgp_best_selection (struct bgp *bgp, struct bgp_node *rn,
}
- /*
- * TODO: Will add some additional filtering later to only
- * output debugs when multipath state for the route changes
- */
- if (BGP_DEBUG (events, EVENTS) && do_mpath)
- {
- struct listnode *mp_node;
- struct bgp_info *mp_info;
- char buf[2][INET_ADDRSTRLEN];
-
- prefix2str (&rn->p, buf[0], sizeof (buf[0]));
- zlog_debug ("%s bestpath nexthop %s, %d mpath candidates",
- buf[0],
- (new_select ?
- inet_ntop(AF_INET, &new_select->attr->nexthop,
- buf[1], sizeof (buf[1])) :
- "None"),
- listcount (&mp_list));
- for (mp_node = listhead (&mp_list); mp_node;
- mp_node = listnextnode (mp_node))
- {
- mp_info = listgetdata (mp_node);
- if (mp_info == new_select)
- continue;
- zlog_debug (" candidate mpath nexthop %s",
- inet_ntop(AF_INET, &mp_info->attr->nexthop, buf[0],
- sizeof (buf[0])));
- }
- }
+ bgp_info_mpath_update (rn, new_select, old_select, &mp_list, mpath_cfg);
bgp_mp_list_clear (&mp_list);
@@ -5995,6 +5969,11 @@ route_vty_out_detail (struct vty *vty, struct bgp *bgp, struct prefix *p,
if (attr->flag & ATTR_FLAG_BIT(BGP_ATTR_ATOMIC_AGGREGATE))
vty_out (vty, ", atomic-aggregate");
+ if (CHECK_FLAG (binfo->flags, BGP_INFO_MULTIPATH) ||
+ (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED) &&
+ bgp_info_mpath_count (binfo)))
+ vty_out (vty, ", multipath");
+
if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
vty_out (vty, ", best");