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Implements 'next hop keep' option for BGP.

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This option allows to keep the received next hop even in cases when
the route is sent to an interface with a different subnet.
This commit is contained in:
Ondrej Zajicek
2013-04-16 17:27:34 +02:00
parent 9ff5257357
commit 48bc232f08
4 changed files with 14 additions and 3 deletions
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8
proto/bgp/attrs.c
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@@ -935,7 +935,8 @@ bgp_create_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
rta->dest != RTD_ROUTER ||
ipa_equal(rta->gw, IPA_NONE) ||
ipa_has_link_scope(rta->gw) ||
(!p->is_internal && (!p->neigh || (rta->iface != p->neigh->iface))))
(!p->is_internal && !p->cf->next_hop_keep &&
(!p->neigh || (rta->iface != p->neigh->iface))))
set_next_hop(z, p->source_addr);
else
set_next_hop(z, rta->gw);
@@ -1003,10 +1004,13 @@ bgp_update_attrs(struct bgp_proto *p, rte *e, ea_list **attrs, struct linpool *p
/* iBGP -> keep next_hop, eBGP multi-hop -> use source_addr,
* eBGP single-hop -> keep next_hop if on the same iface.
* If the next_hop is zero (i.e. link-local), keep only if on the same iface.
*
* Note that same-iface-check uses iface from route, which is based on gw.
*/
a = ea_find(e->attrs->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP));
if (a && !p->cf->next_hop_self &&
((p->is_internal && ipa_nonzero(*((ip_addr *) a->u.ptr->data))) ||
(p->cf->next_hop_keep ||
(p->is_internal && ipa_nonzero(*((ip_addr *) a->u.ptr->data))) ||
(p->neigh && (e->attrs->iface == p->neigh->iface))))
{
/* Leave the original next hop attribute, will check later where does it point */