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bgpd: Fixes for recent well-known-attr check patch.

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* bgp_attr.c: Recent patch to tighten well-known attr checks and apply that
  to all AFIs has some breakage with MP-extensions and GR, which needs to be
  fixed.
  (bgp_attr_check) Graceful Restart EoR can be an empty UPDATE for IPv4/uni.
  MP-Ext allow UPDATE with just MP_UNREACH_NLRI. Check for these and return
  proceed.
  NEXT_HOP becomes optional, if MP_REACH_NLRI is present and there's no
  v4 NLTI, update NEXT_HOP check accordingly.
  Print the missing attr in string form in the log message.
  (bgp_attr_parse) AS_PATH need not be there, so
  bgp_attr_munge_as4_attrs call needs to be conditional on that.

(cherry picked from commit aed1b556cf2f55680ae09d7ad1a1f22729dea8c5)

Conflicts:
	bgpd/bgp_attr.c
This commit is contained in:
Paul Jakma 2014-10-21 16:59:01 +01:00 committed by Daniel Walton
parent bb7bef1490
commit 67495ddb2e
1 changed files with 18 additions and 1 deletions
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19
bgpd/bgp_attr.c
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@ -1821,6 +1821,19 @@ bgp_attr_check (struct peer *peer, struct attr *attr, bgp_size_t nlri_len)
{
u_char type = 0;
/* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
* empty UPDATE. */
if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag)
return BGP_ATTR_PARSE_PROCEED;
/* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
to carry any other path attributes.", though if MP_REACH_NLRI or NLRI
are present, it should. Check for any other attribute being present
instead.
*/
if (attr->flag == ATTR_FLAG_BIT (BGP_ATTR_MP_UNREACH_NLRI))
return BGP_ATTR_PARSE_PROCEED;
if (! CHECK_FLAG (attr->flag, ATTR_FLAG_BIT (BGP_ATTR_ORIGIN)))
type = BGP_ATTR_ORIGIN;
@ -2113,10 +2126,14 @@ bgp_attr_parse (struct peer *peer, struct attr *attr, bgp_size_t size,
* So, to be defensive, we are not relying on any order and read
* all attributes first, including these 32bit ones, and now,
* afterwards, we look what and if something is to be done for as4.
*
* It is possible to not have AS_PATH, e.g. GR EoR and sole
* MP_UNREACH_NLRI.
*/
/* actually... this doesn't ever return failure currently, but
* better safe than sorry */
if (bgp_attr_munge_as4_attrs (peer, attr, as4_path,
if (CHECK_FLAG(attr->flag, ATTR_FLAG_BIT (BGP_ATTR_AS_PATH))
&& bgp_attr_munge_as4_attrs (peer, attr, as4_path,
as4_aggregator, &as4_aggregator_addr))
{
bgp_notify_send (peer,