From cfe34a316e35a209fcd814ccf3523c262e8d4b0a Mon Sep 17 00:00:00 2001 From: Ondrej Zajicek Date: Mon, 5 Jul 2010 17:50:19 +0200 Subject: Implements hostcache and recursive next hops. Hostcache is a structure for monitoring changes in a routing table that is used for routes with dynamic/recursive next hops. This is needed for proper iBGP next hop handling. --- proto/bgp/packets.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) (limited to 'proto/bgp/packets.c') diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c index 1e9d646..514e878 100644 --- a/proto/bgp/packets.c +++ b/proto/bgp/packets.c @@ -802,26 +802,26 @@ bgp_rx_open(struct bgp_conn *conn, byte *pkt, int len) } while (0) static inline int -bgp_get_nexthop(struct bgp_proto *bgp, rta *a) +bgp_set_next_hop(struct bgp_proto *p, rta *a) { - neighbor *neigh; - ip_addr nexthop; struct eattr *nh = ea_find(a->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP)); - ASSERT(nh); - nexthop = *(ip_addr *) nh->u.ptr->data; - neigh = neigh_find(&bgp->p, &nexthop, 0); - if (neigh) + ip_addr nexthop = *(ip_addr *) nh->u.ptr->data; + + if (!p->is_internal) /* FIXME better option + */ { - if (neigh->scope == SCOPE_HOST) - { - DBG("BGP: Loop!\n"); - return 0; - } + neighbor *ng = neigh_find(&p->p, &nexthop, 0) ? : p->neigh; + if (ng->scope == SCOPE_HOST) + return 0; + + a->dest = RTD_ROUTER; + a->gw = ng->addr; + a->iface = ng->iface; + a->hostentry = NULL; } else - neigh = bgp->neigh; - a->gw = neigh->addr; - a->iface = neigh->iface; + rta_set_recursive_next_hop(p->p.table, a, p->igp_table, &nexthop); + return 1; } @@ -853,7 +853,7 @@ bgp_do_rx_update(struct bgp_conn *conn, return; a0 = bgp_decode_attrs(conn, attrs, attr_len, bgp_linpool, nlri_len); - if (a0 && nlri_len && bgp_get_nexthop(p, a0)) + if (a0 && nlri_len && bgp_set_next_hop(p, a0)) { a = rta_lookup(a0); while (nlri_len) -- cgit v1.2.3