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bgpd: Print readable error message when parsing AGGREGATOR attribute

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Having a full feed this leads to unknown. You can't point which prefix or
aspath has this malforming behavior.

Printing just `[EC 33554434] AGGREGATOR attribute is BGP_AS_ZERO(0)` isn't
enough, you can't directly pin-point where is the problem.

Additionally print at least aspath here:
```
[EC 33554434] AGGREGATOR AS number is 0 for aspath: 65000 65031
```

Overall the full table has only 6 such malformed prefixes:
```
aspath: 64539 15096 6939 45430 45458
aspath: 64539 15096 6939 1299 3257 34984 34984 34984 34984 34984 51174
aspath: 64539 15096 6939 286 34984 16135 16135 {16135}
aspath: 64539 15096 6939 7545 7545 136001
aspath: 64539 15096 6939 6762 3269 20746
aspath: 64539 15096 6939 7018 3379
```

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>
This commit is contained in:
Donatas Abraitis 2020-03-26 16:06:00 +02:00
parent 8fcca5024f
commit 0f2a703d5e
1 changed files with 18 additions and 16 deletions
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34
bgpd/bgp_attr.c
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@ -1655,20 +1655,21 @@ static int bgp_attr_aggregator(struct bgp_attr_parser_args *args)
else
aggregator_as = stream_getw(peer->curr);
/* Codification of AS 0 Processing */
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"AGGREGATOR attribute is BGP_AS_ZERO(0)");
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
args->total);
}
attr->aggregator_as = aggregator_as;
attr->aggregator_addr.s_addr = stream_get_ipv4(peer->curr);
/* Set atomic aggregate flag. */
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AGGREGATOR);
/* Codification of AS 0 Processing */
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"AGGREGATOR AS number is 0 for aspath: %s",
aspath_print(attr->aspath));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
args->total);
}
return BGP_ATTR_PARSE_PROCEED;
}
@ -1690,20 +1691,21 @@ bgp_attr_as4_aggregator(struct bgp_attr_parser_args *args,
0);
}
/* Codification of AS 0 Processing */
aggregator_as = stream_getl(peer->curr);
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"AS4_AGGREGATOR attribute is BGP_AS_ZERO(0)");
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
0);
}
*as4_aggregator_as = aggregator_as;
as4_aggregator_addr->s_addr = stream_get_ipv4(peer->curr);
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AS4_AGGREGATOR);
/* Codification of AS 0 Processing */
if (aggregator_as == BGP_AS_ZERO) {
flog_err(EC_BGP_ATTR_LEN,
"AS4_AGGREGATOR AS number is 0 for aspath: %s",
aspath_print(attr->aspath));
return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_AS_PATH,
0);
}
return BGP_ATTR_PARSE_PROCEED;
}