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bgpd: add missing "partial" flag checks (BZ#676)

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ORIGIN handling function used to have "partial" bit check and recent
commits added it for NEXT_HOP, MULTI_EXIT_DISC and ATOMIC_AGGREGATE
cases. This commit adds "partial" check for AS_PATH and LOCAL_PREF
cases, which should leave attributes 1 through 6 inclusive completely
covered with attribute flags checks.

* bgp_attr.c
  * bgp_attr_origin(): use bit-by-bit checks for better diagnostics
  * bgp_attr_aspath(): add flag check
  * bgp_attr_local_pref(): idem

Conflicts:

	bgpd/bgp_attr.c
This commit is contained in:
Denis Ovsienko 2011-09-24 13:20:43 +04:00
parent bc3443ebf0
commit 214bcaa13e
1 changed files with 38 additions and 3 deletions
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39
bgpd/bgp_attr.c
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@ -773,10 +773,26 @@ bgp_attr_origin (struct peer *peer, bgp_size_t length,
with the Attribute Type Code, then the Error Subcode is set to
Attribute Flags Error. The Data field contains the erroneous
attribute (type, length and value). */
if (flag != BGP_ATTR_FLAG_TRANS)
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
{
zlog (peer->log, LOG_ERR,
"Origin attribute flag isn't transitive %d", flag);
"ORIGIN attribute must not be flagged as \"optional\" (%u)", flag);
return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
}
if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
{
zlog (peer->log, LOG_ERR,
"ORIGIN attribute must be flagged as \"transitive\" (%u)", flag);
return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
}
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
{
zlog (peer->log, LOG_ERR,
"ORIGIN attribute must not be flagged as \"partial\" (%u)", flag);
return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
@ -830,6 +846,15 @@ bgp_attr_aspath (struct peer *peer, bgp_size_t length,
total = length + (CHECK_FLAG (flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
/* Flag check. */
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
{
zlog (peer->log, LOG_ERR,
"AS_PATH attribute must not be flagged as \"partial\" (%u)", flag);
return bgp_attr_malformed (peer, BGP_ATTR_ORIGIN, flag,
BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
startp, total);
}
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL)
|| ! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
{
@ -1116,6 +1141,16 @@ bgp_attr_local_pref (struct peer *peer, bgp_size_t length,
startp, total);
return -1;
}
if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
{
zlog (peer->log, LOG_ERR,
"LOCAL_PREF 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;
}
/* If it is contained in an UPDATE message that is received from an
external peer, then this attribute MUST be ignored by the