Add support for route tags

Credit
------
A huge amount of credit for this patch goes to Piotr Chytla for
their 'route tags support' patch that was submitted to quagga-dev
in June 2007.

Documentation
-------------
All ipv4 and ipv6 static route commands now have a "tag" option
which allows the user to set a tag between 1 and 65535.

quagga(config)# ip route 1.1.1.1/32 10.1.1.1 tag ?
  <1-65535>  Tag value
quagga(config)# ip route 1.1.1.1/32 10.1.1.1 tag 40
quagga(config)#

quagga# show ip route 1.1.1.1/32
Routing entry for 1.1.1.1/32
  Known via "static", distance 1, metric 0, tag 40, best
  * 10.1.1.1, via swp1

quagga#

The route-map parser supports matching on tags and setting tags
!
route-map MATCH_TAG_18 permit 10
 match tag 18
!

!
route-map SET_TAG_22 permit 10
 set tag 22
!

BGP and OSPF support:
- matching on tags when redistribing routes from the RIB into BGP/OSPF.
- setting tags when redistribing routes from the RIB into BGP/OSPF.

BGP also supports setting a tag via a table-map, when installing BGP
routes into the RIB.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/ospfd/ospf_asbr.c b/ospfd/ospf_asbr.c
index dbf7f11f5..f4140b858 100644
--- a/ospfd/ospf_asbr.c
+++ b/ospfd/ospf_asbr.c
@@ -135,7 +135,8 @@ ospf_route_map_set_compare (struct route_map_set_values *values1,
 /* Add an External info for AS-external-LSA. */
 struct external_info *
 ospf_external_info_add (u_char type, struct prefix_ipv4 p,
-			unsigned int ifindex, struct in_addr nexthop)
+			unsigned int ifindex, struct in_addr nexthop,
+                        u_short tag)
 {
   struct external_info *new;
   struct route_node *rn;
@@ -162,7 +163,7 @@ ospf_external_info_add (u_char type, struct prefix_ipv4 p,
   new->p = p;
   new->ifindex = ifindex;
   new->nexthop = nexthop;
-  new->tag = 0;
+  new->tag = tag;
 
   if (rn)
     rn->info = new;