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add rfc6793 support - AS4_PATH, AS4_AGGREGATOR #1

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add rfc6793 support - AS4_PATH, AS4_AGGREGATOR #1

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22 changes: 22 additions & 0 deletions zebra-dump-parser.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,8 @@
BGP_ATTR_MP_REACH_NLRI => 14,
BGP_ATTR_MP_UNREACH_NLRI => 15,
BGP_ATTR_EXT_COMMUNITIES => 16,
BGP_ATTR_AS4_PATH => 17,
BGP_ATTR_AS4_AGGREGATOR => 18,
};

my @BGP_ORIGIN = qw(IGP EGP Incomplete);
Expand Down Expand Up @@ -352,6 +354,9 @@ sub parse_attributes {
if ($type == BGP_ATTR_ORIGIN) {
$attr[BGP_ATTR_ORIGIN] = unpack('C', $attrib);
} elsif ($type == BGP_ATTR_AS_PATH) {
if($attr[BGP_ATTR_AS4_PATH]) {
next; # ignore AS_PATH if AS4_PATH exists
}
$attr[BGP_ATTR_AS_PATH] = [ ];
$as_size ||= 2;
while (length $attrib > 0) {
Expand All @@ -370,6 +375,9 @@ sub parse_attributes {
} elsif ($type == BGP_ATTR_ATOMIC_AGGREGATE) {
$attr[BGP_ATTR_ATOMIC_AGGREGATE] = 1;
} elsif ($type == BGP_ATTR_AGGREGATOR) {
if($attr[BGP_ATTR_AS4_AGGREGATOR]) {
next; # ignore BGP_ATTR_AGGREGATOR if BGP_ATTR_AS4_AGGREGATOR exists
}
$attr[BGP_ATTR_AGGREGATOR] = [ unpack('a2 a4', $attrib) ];# N, IPv4
} elsif ($type == BGP_ATTR_COMMUNITIES) {
$attr[BGP_ATTR_COMMUNITIES] = [ ];
Expand Down Expand Up @@ -421,6 +429,20 @@ sub parse_attributes {
$attr[BGP_ATTR_ORIGINATOR_ID] = $attrib; # IPv4
} elsif ($type == BGP_ATTR_CLUSTER_LIST) {
$attr[BGP_ATTR_CLUSTER_LIST] = $attrib; # IPv4
} elsif ($type == BGP_ATTR_AS4_PATH) {
$attr[BGP_ATTR_AS_PATH] = [ ];
$attr[BGP_ATTR_AS4_PATH] = 1;
$as_size = 4;
while (length $attrib > 0) {
my ($seg_type, $seg_length);
($seg_type, $seg_length, $attrib) = unpack('C C a*', $attrib);
my $seg_value = substr($attrib, 0, $seg_length * $as_size, '');
push(@{$attr[BGP_ATTR_AS_PATH]},
[ $seg_type, [ unpack("(a$as_size)*", $seg_value) ] ]);
}
} elsif ($type == BGP_ATTR_AS4_AGGREGATOR) {
$attr[BGP_ATTR_AS4_AGGREGATOR] = 1;
$attr[BGP_ATTR_AGGREGATOR] = [ unpack('a4 a4', $attrib) ];# N, IPv4
} else {
warn "Unknown BGP attribute $type (flags: $flags)\n";
}
Expand Down