+ /* pick lowest hold time */
+ if (hold < peer->hold)
+ peer->hold = hold;
+
+ /* adjust our keepalive based on negotiated hold value */
+ if (peer->keepalive * 3 > peer->hold)
+ peer->keepalive = peer->hold / 3;
+
+ /* check for optional parameters */
+ /* 2 is for the size of type + len (both uint8_t) */
+ for (param_offset = 0;
+ param_offset < data.opt_len;
+ param_offset += 2 + param->len)
+ {
+ param = (struct bgp_opt_param *)((char *)&data.opt_params + param_offset);
+
+ /* sensible check */
+ if (data.opt_len - param_offset < 2
+ || param->len > data.opt_len - param_offset - 2)
+ {
+ LOG(1, 0, 0, "Malformed Optional Parameter list from BGP peer %s\n",
+ peer->name);
+
+ bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC);
+ return 0;
+ }
+
+ /* we know only one parameter type */
+ if (param->type != BGP_PARAM_TYPE_CAPABILITY)
+ {
+ LOG(1, 0, 0, "Unsupported Optional Parameter type %d from BGP peer %s\n",
+ param->type, peer->name);
+
+ bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_OPN_UNSUP_PARAM);
+ return 0;
+ }
+
+ capabilities_len = param->len;
+ capabilities = (char *)¶m->value;
+
+ /* look for BGP multiprotocol capability */
+ for (capability_offset = 0;
+ capability_offset < capabilities_len;
+ capability_offset += 2 + capability->len)
+ {
+ capability = (struct bgp_capability *)(capabilities + capability_offset);
+
+ /* sensible check */
+ if (capabilities_len - capability_offset < 2
+ || capability->len > capabilities_len - capability_offset - 2)
+ {
+ LOG(1, 0, 0, "Malformed Capabilities list from BGP peer %s\n",
+ peer->name);
+
+ bgp_send_notification(peer, BGP_ERR_OPEN, BGP_ERR_UNSPEC);
+ return 0;
+ }
+
+ /* we only know one capability code */
+ if (capability->code != BGP_CAP_CODE_MP
+ && capability->len != sizeof(struct bgp_mp_cap_param))
+ {
+ LOG(4, 0, 0, "Unsupported Capability code %d from BGP peer %s\n",
+ capability->code, peer->name);
+
+ /* we don't terminate, still; we just jump to the next one */
+ continue;
+ }
+
+ mp_cap = (struct bgp_mp_cap_param *)&capability->value;
+ /* the only <AFI, SAFI> tuple we support */
+ if (ntohs(mp_cap->afi) != BGP_MP_AFI_IPv6 && mp_cap->safi != BGP_MP_SAFI_UNICAST)
+ {
+ LOG(4, 0, 0, "Unsupported multiprotocol AFI %d and SAFI %d from BGP peer %s\n",
+ mp_cap->afi, mp_cap->safi, peer->name);
+
+ /* we don't terminate, still; we just jump to the next one */
+ continue;
+ }
+
+ /* yes it can! */
+ peer->mp_handling = HandleIPv6Routes;
+ }
+ }
+
+ if (peer->mp_handling != HandleIPv6Routes)
+ {
+ peer->mp_handling = DoesntHandleIPv6Routes;
+ if (config->ipv6_prefix.s6_addr[0])
+ LOG(1, 0, 0, "Warning: BGP peer %s doesn't handle IPv6 prefixes updates\n",
+ peer->name);
+ }
+
projects / l2tpns.git / blobdiff