bgpd: rewrite attr flag error logging
* bgp_attr.c
* attr_flag_str: new message list
* bgp_attr_flags_diagnose(): new function, implements previously added
error logging in a generic way
* bgp_attr_origin(): use bgp_attr_flags_diagnose()
* bgp_attr_nexthop(): ditto
* bgp_attr_med(): ditto
* bgp_attr_local_pref(): ditto
* bgp_attr_atomic(): ditto
* bgp_attr_originator_id(): ditto
* bgp_attr_cluster_list(): ditto
* bgp_mp_reach_parse(): ditto
* bgp_mp_unreach_parse(): ditto
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 7c94f7e..829b017 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -62,6 +62,17 @@
{ BGP_ATTR_AS_PATHLIMIT, "AS_PATHLIMIT" },
};
static const int attr_str_max = sizeof(attr_str)/sizeof(attr_str[0]);
+
+static const struct message attr_flag_str[] =
+{
+ { BGP_ATTR_FLAG_OPTIONAL, "Optional" },
+ { BGP_ATTR_FLAG_TRANS, "Transitive" },
+ { BGP_ATTR_FLAG_PARTIAL, "Partial" },
+ /* bgp_attr_flags_diagnose() relies on this bit being last in this list */
+ { BGP_ATTR_FLAG_EXTLEN, "Extended Length" },
+};
+static const size_t attr_flag_str_max =
+ sizeof (attr_flag_str) / sizeof (attr_flag_str[0]);
static struct hash *cluster_hash;
@@ -697,6 +708,40 @@
}
}
+/* Find out what is wrong with the path attribute flag bits and log the error.
+ "Flag bits" here stand for Optional, Transitive and Partial, but not for
+ Extended Length. Checking O/T/P bits at once implies, that the attribute
+ being diagnosed is defined by RFC as either a "well-known" or an "optional,
+ non-transitive" attribute. */
+static void
+bgp_attr_flags_diagnose
+(
+ struct peer * peer,
+ const u_int8_t attr_code,
+ u_int8_t desired_flags, /* how RFC says it must be */
+ u_int8_t real_flags /* on wire */
+)
+{
+ u_char seen = 0, i;
+
+ desired_flags &= ~BGP_ATTR_FLAG_EXTLEN;
+ real_flags &= ~BGP_ATTR_FLAG_EXTLEN;
+ for (i = 0; i <= 2; i++) /* O,T,P, but not E */
+ if
+ (
+ CHECK_FLAG (desired_flags, attr_flag_str[i].key) !=
+ CHECK_FLAG (real_flags, attr_flag_str[i].key)
+ )
+ {
+ zlog (peer->log, LOG_ERR, "%s attribute must%s be flagged as \"%s\"",
+ LOOKUP (attr_str, attr_code),
+ CHECK_FLAG (desired_flags, attr_flag_str[i].key) ? "" : " not",
+ attr_flag_str[i].str);
+ seen = 1;
+ }
+ assert (seen);
+}
+
/* Get origin attribute of the update message. */
static int
bgp_attr_origin (struct peer *peer, bgp_size_t length,
@@ -714,12 +759,7 @@
attribute (type, length and value). */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "ORIGIN attribute must not be flagged as \"optional\" (%u)", flag);
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "ORIGIN attribute must be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "ORIGIN attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_ORIGIN, BGP_ATTR_FLAG_TRANS, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -917,12 +957,7 @@
/* Flags check. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must not be flagged as \"optional\" (%u)", flag);
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "NEXT_HOP attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_NEXT_HOP, BGP_ATTR_FLAG_TRANS, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -977,12 +1012,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_OPTIONAL)
{
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must be flagged as \"optional\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must not be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "MULTI_EXIT_DISC attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_MULTI_EXIT_DISC, BGP_ATTR_FLAG_OPTIONAL, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1018,12 +1048,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "LOCAL_PREF attribute must not be flagged as \"optional\" (%u)", flag);
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "LOCAL_PREF attribute must be flagged as \"transitive\" (%u)", flag);
- 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_attr_flags_diagnose (peer, BGP_ATTR_LOCAL_PREF, BGP_ATTR_FLAG_TRANS, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1066,12 +1091,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_TRANS)
{
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must not be flagged as \"optional\" (%u)", flag);
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "ATOMIC_AGGREGATE attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_ATOMIC_AGGREGATE, BGP_ATTR_FLAG_TRANS, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1325,12 +1345,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_OPTIONAL)
{
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must be flagged as \"optional\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must not be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "ORIGINATOR_ID attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_ORIGINATOR_ID, BGP_ATTR_FLAG_OPTIONAL, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1364,12 +1379,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != 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_attr_flags_diagnose (peer, BGP_ATTR_CLUSTER_LIST, BGP_ATTR_FLAG_OPTIONAL, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1412,12 +1422,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_OPTIONAL)
{
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "MP_REACH_NLRI attribute must be flagged as \"optional\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "MP_REACH_NLRI attribute must not be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "MP_REACH_NLRI attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_MP_REACH_NLRI, BGP_ATTR_FLAG_OPTIONAL, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}
@@ -1559,12 +1564,7 @@
/* Flag checks. */
if ((flag & ~BGP_ATTR_FLAG_EXTLEN) != BGP_ATTR_FLAG_OPTIONAL)
{
- if (! CHECK_FLAG (flag, BGP_ATTR_FLAG_OPTIONAL))
- zlog (peer->log, LOG_ERR, "MP_UNREACH_NLRI attribute must be flagged as \"optional\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_TRANS))
- zlog (peer->log, LOG_ERR, "MP_UNREACH_NLRI attribute must not be flagged as \"transitive\" (%u)", flag);
- if (CHECK_FLAG (flag, BGP_ATTR_FLAG_PARTIAL))
- zlog (peer->log, LOG_ERR, "MP_UNREACH_NLRI attribute must not be flagged as \"partial\" (%u)", flag);
+ bgp_attr_flags_diagnose (peer, BGP_ATTR_MP_UNREACH_NLRI, BGP_ATTR_FLAG_OPTIONAL, flag);
bgp_notify_send_with_data (peer, BGP_NOTIFY_UPDATE_ERR, BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, startp, total);
return -1;
}