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Merge pull request #1367 from donaldsharp/mp_reach_parse

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bgpd: Treat empty reachable NLRI as a EOR
This commit is contained in:
Russ White 2017-10-31 20:23:32 -04:00 committed by GitHub
commit b8c962aa6e
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 23 additions and 2 deletions
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17
bgpd/bgp_attr.c
View File

@ -1709,11 +1709,20 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
/* must have nrli_len, what is left of the attribute */
nlri_len = LEN_LEFT;
if ((!nlri_len) || (nlri_len > STREAM_READABLE(s))) {
if (nlri_len > STREAM_READABLE(s)) {
zlog_info("%s: (%s) Failed to read NLRI", __func__, peer->host);
return BGP_ATTR_PARSE_ERROR_NOTIFYPLS;
}
if (!nlri_len) {
zlog_info("%s: (%s) No Reachability, Treating as a EOR marker",
__func__, peer->host);
mp_update->afi = afi;
mp_update->safi = safi;
return BGP_ATTR_PARSE_EOR;
}
mp_update->afi = afi;
mp_update->safi = safi;
mp_update->nlri = stream_pnt(s);
@ -2378,6 +2387,12 @@ bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr,
ret = BGP_ATTR_PARSE_ERROR;
}
if (ret == BGP_ATTR_PARSE_EOR) {
if (as4_path)
aspath_unintern(&as4_path);
return ret;
}
/* If hard error occured immediately return to the caller. */
if (ret == BGP_ATTR_PARSE_ERROR) {
zlog_warn("%s: Attribute %s, parse error", peer->host,

1
bgpd/bgp_attr.h
View File

@ -227,6 +227,7 @@ typedef enum {
/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
*/
BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
BGP_ATTR_PARSE_EOR = -4,
} bgp_attr_parse_ret_t;
struct bpacket_attr_vec_arr;

7
bgpd/bgp_packet.c
View File

@ -1553,7 +1553,9 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size)
* Non-MP IPv4/Unicast EoR is a completely empty UPDATE
* and MP EoR should have only an empty MP_UNREACH
*/
if (!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0) {
if ((!update_len && !withdraw_len &&
nlris[NLRI_MP_UPDATE].length == 0) ||
(attr_parse_ret == BGP_ATTR_PARSE_EOR)) {
afi_t afi = 0;
safi_t safi;
@ -1568,6 +1570,9 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size)
&& nlris[NLRI_MP_WITHDRAW].length == 0) {
afi = nlris[NLRI_MP_WITHDRAW].afi;
safi = nlris[NLRI_MP_WITHDRAW].safi;
} else if (attr_parse_ret == BGP_ATTR_PARSE_EOR) {
afi = nlris[NLRI_MP_UPDATE].afi;
safi = nlris[NLRI_MP_UPDATE].safi;
}
if (afi && peer->afc[afi][safi]) {