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Implements option that controls IPv6 BGP next hops when lladdr is missing.

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This commit is contained in:
Ondrej Zajicek
2009-11-18 20:32:36 +01:00
parent 62aa96caa2
commit 3f9b7bfe9f
6 changed files with 69 additions and 23 deletions
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47
proto/bgp/packets.c
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@@ -199,7 +199,7 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
if (a_size < 0)
{
log(L_ERR "%s: Attribute list too long, skipping corresponding route group", p->p.name);
log(L_ERR "%s: Attribute list too long, skipping corresponding routes", p->p.name);
bgp_flush_prefixes(p, buck);
rem_node(&buck->send_node);
bgp_free_bucket(p, buck);
@@ -234,9 +234,9 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
{
struct bgp_proto *p = conn->bgp;
struct bgp_bucket *buck;
int size, second;
int size, second, rem_stored;
int remains = BGP_MAX_PACKET_LENGTH - BGP_HEADER_LENGTH - 4;
byte *w, *tmp, *tstart;
byte *w, *w_stored, *tmp, *tstart;
ip_addr *ipp, ip, ip_ll;
ea_list *ea;
eattr *nh;
@@ -272,28 +272,25 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
}
DBG("Processing bucket %p\n", buck);
size = bgp_encode_attrs(p, w, buck->eattrs, 2048);
rem_stored = remains;
w_stored = w;
size = bgp_encode_attrs(p, w, buck->eattrs, 2048);
if (size < 0)
{
log(L_ERR "%s: Attribute list too long, ignoring corresponding route group", p->p.name);
log(L_ERR "%s: Attribute list too long, skipping corresponding routes", p->p.name);
bgp_flush_prefixes(p, buck);
rem_node(&buck->send_node);
bgp_free_bucket(p, buck);
continue;
}
w += size;
remains -= size;
tstart = tmp = bgp_attach_attr_wa(&ea, bgp_linpool, BA_MP_REACH_NLRI, remains-8);
*tmp++ = 0;
*tmp++ = BGP_AF_IPV6;
*tmp++ = 1;
/* We have two addresses here in NEXT_HOP eattr. Really.
Unless NEXT_HOP was modified by filter */
nh = ea_find(buck->eattrs, EA_CODE(EAP_BGP, BA_NEXT_HOP));
ASSERT(nh);
/* We have two addresses here in 'nh'. Really.
Unless NEXT_HOP was modified by filter */
second = (nh->u.ptr->length == NEXT_HOP_LENGTH);
ipp = (ip_addr *) nh->u.ptr->data;
ip = ipp[0];
@@ -322,12 +319,32 @@ bgp_create_update(struct bgp_conn *conn, byte *buf)
ip_ll = ipp[1];
else
{
ip = p->source_addr;
ip_ll = p->local_link;
switch (p->cf->missing_lladdr)
{
case MLL_SELF:
ip = p->source_addr;
ip_ll = p->local_link;
break;
case MLL_DROP:
log(L_ERR "%s: Missing link-local next hop address, skipping corresponding routes", p->p.name);
w = w_stored;
remains = rem_stored;
bgp_flush_prefixes(p, buck);
rem_node(&buck->send_node);
bgp_free_bucket(p, buck);
continue;
case MLL_IGNORE:
break;
}
}
}
}
tstart = tmp = bgp_attach_attr_wa(&ea, bgp_linpool, BA_MP_REACH_NLRI, remains-8);
*tmp++ = 0;
*tmp++ = BGP_AF_IPV6;
*tmp++ = 1;
if (ipa_nonzero(ip_ll))
{
*tmp++ = 32;