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bgpd: check CLUSTER_LIST attribute flags

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* bgp_attr.c
  * bgp_attr_cluster_list(): accept extra argument, add checks for
    "optional", "transitive" and "partial" bits, log each error
    condition independently
  * bgp_attr_parse(): provide extra arguments
This commit is contained in:
Denis Ovsienko 2011-09-30 15:12:17 +04:00
parent 5de1719994
commit cadc4cf05d
1 changed files with 17 additions and 2 deletions
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19
bgpd/bgp_attr.c
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@ -1326,8 +1326,23 @@ bgp_attr_originator_id (struct peer *peer, bgp_size_t length,
/* Cluster list attribute. */ /* Cluster list attribute. */
static int static int
bgp_attr_cluster_list (struct peer *peer, bgp_size_t length, bgp_attr_cluster_list (struct peer *peer, bgp_size_t length,
struct attr *attr, u_char flag) struct attr *attr, u_char flag, u_char *startp)
{ {
bgp_size_t total;
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag checks. */
if (flag != BGP_ATTR_FLAG_OPTIONAL)
{
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must be flagged as \"optional\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must not be flagged as \"transitive\" (%u)", flag);
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
zlog (peer->log, LOG_ERR, "CLUSTER_LIST attribute must not be flagged as \"partial\" (%u)", flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
/* Check length. */ /* Check length. */
if (length % 4) if (length % 4)
{ {
@ -1759,7 +1774,7 @@ bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size,
ret = bgp_attr_originator_id (peer, length, attr, flag, startp); ret = bgp_attr_originator_id (peer, length, attr, flag, startp);
break; break;
case BGP_ATTR_CLUSTER_LIST: case BGP_ATTR_CLUSTER_LIST:
ret = bgp_attr_cluster_list (peer, length, attr, flag); ret = bgp_attr_cluster_list (peer, length, attr, flag, startp);
break; break;
case BGP_ATTR_MP_REACH_NLRI: case BGP_ATTR_MP_REACH_NLRI:
ret = bgp_mp_reach_parse (peer, length, attr, mp_update); ret = bgp_mp_reach_parse (peer, length, attr, mp_update);