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bgpd: Late registration of Extended Nexthop should allow RA's to happen

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When we have a late registration of the Extended Nexthop capability
for BGP and the peer already has nexthop information stored, go
through and enable RA on the important interfaces.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-11-06 15:55:36 -05:00
parent 8dfa7e4680
commit 1ea03b905d
3 changed files with 60 additions and 0 deletions
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45
bgpd/bgp_nht.c
View File

@ -838,3 +838,48 @@ void bgp_nht_register_nexthops(struct bgp *bgp)
}
}
}
void bgp_nht_register_enhe_capability_interfaces(struct peer *peer)
{
struct bgp *bgp;
struct bgp_node *rn;
struct bgp_nexthop_cache *bnc;
struct nexthop *nhop;
struct interface *ifp;
struct prefix p;
if (peer->ifp)
return;
bgp = peer->bgp;
if (!bgp->nexthop_cache_table[AFI_IP6])
return;
if (!sockunion2hostprefix(&peer->su, &p)) {
if (BGP_DEBUG(nht, NHT))
zlog_debug("%s: Unable to convert prefix to sockunion",
__PRETTY_FUNCTION__);
return;
}
if (p.family != AF_INET6)
return;
rn = bgp_node_lookup(bgp->nexthop_cache_table[AFI_IP6], &p);
bnc = bgp_nexthop_get_node_info(rn);
if (!bnc)
return;
if (peer != bnc->nht_info)
return;
for (nhop = bnc->nexthop; nhop; nhop = nhop->next) {
ifp = if_lookup_by_index(nhop->ifindex,
nhop->vrf_id);
zclient_send_interface_radv_req(zclient,
nhop->vrf_id,
ifp, true,
BGP_UNNUM_DEFAULT_RA_INTERVAL);
}
}

9
bgpd/bgp_nht.h
View File

@ -88,4 +88,13 @@ extern void path_nh_map(struct bgp_path_info *path,
*/
extern void bgp_nht_register_nexthops(struct bgp *bgp);
/*
* When we have the the PEER_FLAG_CAPABILITY_ENHE flag
* set on a peer *after* it has been brought up we need
* to notice and setup the interface based RA,
* this code can walk the registered nexthops and
* register the important ones with zebra for RA.
*/
extern void bgp_nht_register_enhe_capability_interfaces(struct peer *peer);
#endif /* _BGP_NHT_H */

6
bgpd/bgpd.c
View File

@ -3905,6 +3905,9 @@ static int peer_flag_modify(struct peer *peer, uint32_t flag, int set)
return 0;
}
if (set && flag == PEER_FLAG_CAPABILITY_ENHE)
bgp_nht_register_enhe_capability_interfaces(peer);
/*
* Update peer-group members, unless they are explicitely overriding
* peer-group configuration.
@ -3928,6 +3931,9 @@ static int peer_flag_modify(struct peer *peer, uint32_t flag, int set)
/* Update flag on peer-group member. */
COND_FLAG(member->flags, flag, set != member_invert);
if (set && flag == PEER_FLAG_CAPABILITY_ENHE)
bgp_nht_register_enhe_capability_interfaces(member);
/* Execute flag action on peer-group member. */
if (action.type == peer_change_reset)
peer_flag_modify_action(member, flag);