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, 5 insertions, 0 deletions

diff --git a/lib/zclient.h b/lib/zclient.h
index 5c24ee459..9b627b65f 100644
--- a/lib/zclient.h
+++ b/lib/zclient.h
@@ -92,6 +92,7 @@ struct zclient
 #define ZAPI_MESSAGE_IFINDEX  0x02
 #define ZAPI_MESSAGE_DISTANCE 0x04
 #define ZAPI_MESSAGE_METRIC   0x08
+#define ZAPI_MESSAGE_TAG      0x20
 
 /* Zserv protocol message header */
 struct zserv_header
@@ -125,6 +126,8 @@ struct zapi_ipv4
   u_char distance;
 
   u_int32_t metric;
+
+  u_short tag;
 };
 
 /* Prototypes of zebra client service functions. */
@@ -185,6 +188,8 @@ struct zapi_ipv6
   u_char distance;
 
   u_int32_t metric;
+
+  u_short tag;
 };
 
 extern int zapi_ipv6_route (u_char cmd, struct zclient *zclient,