bgpd: Check for IP-format Site-of-Origin

When deciding whether to apply "neighbor soo" filtering towards a peer,
we were only looking for SoO ecoms that use either AS or AS4 encoding.
This makes sure we also check for IPv4 encoding, since we allow a user
to configure that encoding style against the peer.

Config:
```
router bgp 1
 address-family ipv4 unicast
  network 100.64.0.2/32 route-map soo-foo
  neighbor 192.168.122.12 soo 3.3.3.3:20
 exit-address-family
!
route-map soo-foo permit 10
 set extcommunity soo 3.3.3.3:20
exit
```

Before:
```
ub20# show ip bgp neighbors 192.168.122.12 advertised-routes
BGP table version is 5, local router ID is 100.64.0.222, vrf id 0
Default local pref 100, local AS 1
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
*> 2.2.2.2/32       0.0.0.0                  0    100  32768 i
*> 100.64.0.2/32    0.0.0.0                  0    100  32768 i

Total number of prefixes 2
```

After:
```
ub20# show ip bgp neighbors 192.168.122.12 advertised-routes
BGP table version is 5, local router ID is 100.64.0.222, vrf id 0
Default local pref 100, local AS 1
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
*> 2.2.2.2/32       0.0.0.0                  0    100  32768 i

Total number of prefixes 1
```

Signed-off-by: Trey Aspelund <taspelund@nvidia.com>
(cherry picked from commit 8c4d4624d2619ac23f082c354064b48b1c7e2842)

diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 856c2c53cdb74a8672f3ab5ce897c265dca744bb..9ec70ab3de5ed8dc0d111ee221903779a3ccd35d 100644 (file)
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -2329,7 +2329,7 @@ bool subgroup_announce_check(struct bgp_dest *dest, struct bgp_path_info *pi,
                if (aspath_check_as_sets(attr->aspath))
                        return false;
 
-       /* If neighbor sso is configured, then check if the route has
+       /* If neighbor soo is configured, then check if the route has
         * SoO extended community and validate against the configured
         * one. If they match, do not announce, to prevent routing
         * loops.
@@ -2342,6 +2342,8 @@ bool subgroup_announce_check(struct bgp_dest *dest, struct bgp_path_info *pi,
                if ((ecommunity_lookup(ecomm, ECOMMUNITY_ENCODE_AS,
                                       ECOMMUNITY_SITE_ORIGIN) ||
                     ecommunity_lookup(ecomm, ECOMMUNITY_ENCODE_AS4,
+                                      ECOMMUNITY_SITE_ORIGIN) ||
+                    ecommunity_lookup(ecomm, ECOMMUNITY_ENCODE_IP,
                                       ECOMMUNITY_SITE_ORIGIN)) &&
                    ecommunity_include(ecomm, ecomm_soo)) {
                        if (bgp_debug_update(NULL, p, subgrp->update_group, 0))