diff options
Diffstat (limited to 'bgpd/bgp_open.c')
| -rw-r--r-- | bgpd/bgp_open.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/bgpd/bgp_open.c b/bgpd/bgp_open.c index 9fcd64bd2d..ddc8f9e8a6 100644 --- a/bgpd/bgp_open.c +++ b/bgpd/bgp_open.c @@ -530,6 +530,48 @@ bgp_capability_hostname (struct peer *peer, struct capability_header *hdr) return 0; } +static int +bgp_capability_enhe (struct peer *peer, struct capability_header *hdr) +{ + struct stream *s = BGP_INPUT (peer); + size_t end = stream_get_getp (s) + hdr->length; + + while (stream_get_getp (s) + 6 <= end) + { + afi_t afi = stream_getw (s); + safi_t safi = stream_getw (s); + afi_t nh_afi = stream_getw (s); + + if (bgp_debug_neighbor_events(peer)) + zlog_debug ("%s Received with value triple (afi/safi/next-hop afi): %u/%u/%u", + peer->host, afi, safi, nh_afi); + + if (!bgp_afi_safi_valid_indices (afi, &safi)) + return -1; + + if (afi != AFI_IP || nh_afi != AFI_IP6) + { + zlog_warn ("%s Extended Next-hop capability, wrong afi/next-hop afi: %u/%u", + peer->host, afi, nh_afi); + return -1; + } + + /* Until SAFIs other than SAFI_UNICAST are supported */ + if (safi != SAFI_UNICAST) + zlog_warn ("%s Extended Next-hop capability came with unsupported SAFI: %u", + peer->host, safi); + + SET_FLAG (peer->af_cap[afi][safi], PEER_CAP_ENHE_AF_RCV); + + if (CHECK_FLAG (peer->af_cap[afi][safi], PEER_CAP_ENHE_AF_ADV)) + SET_FLAG (peer->af_cap[afi][safi], PEER_CAP_ENHE_AF_NEGO); + } + + SET_FLAG (peer->cap, PEER_CAP_ENHE_RCV); + + return 0; +} + static const struct message capcode_str[] = { { CAPABILITY_CODE_MP, "MultiProtocol Extensions" }, @@ -539,6 +581,7 @@ bgp_capability_hostname (struct peer *peer, struct capability_header *hdr) { CAPABILITY_CODE_AS4, "4-octet AS number" }, { CAPABILITY_CODE_ADDPATH, "AddPath" }, { CAPABILITY_CODE_DYNAMIC, "Dynamic" }, + { CAPABILITY_CODE_ENHE, "Extended Next Hop Encoding" }, { CAPABILITY_CODE_DYNAMIC_OLD, "Dynamic (Old)" }, { CAPABILITY_CODE_REFRESH_OLD, "Route Refresh (Old)" }, { CAPABILITY_CODE_ORF_OLD, "ORF (Old)" }, @@ -557,6 +600,7 @@ static const size_t cap_minsizes[] = [CAPABILITY_CODE_ADDPATH] = CAPABILITY_CODE_ADDPATH_LEN, [CAPABILITY_CODE_DYNAMIC] = CAPABILITY_CODE_DYNAMIC_LEN, [CAPABILITY_CODE_DYNAMIC_OLD] = CAPABILITY_CODE_DYNAMIC_LEN, + [CAPABILITY_CODE_ENHE] = CAPABILITY_CODE_ENHE_LEN, [CAPABILITY_CODE_REFRESH_OLD] = CAPABILITY_CODE_REFRESH_LEN, [CAPABILITY_CODE_ORF_OLD] = sizeof (struct capability_orf_entry), [CAPABILITY_CODE_HOSTNAME] = CAPABILITY_CODE_MIN_HOSTNAME_LEN, @@ -624,6 +668,7 @@ bgp_capability_parse (struct peer *peer, size_t length, int *mp_capability, case CAPABILITY_CODE_ADDPATH: case CAPABILITY_CODE_DYNAMIC: case CAPABILITY_CODE_DYNAMIC_OLD: + case CAPABILITY_CODE_ENHE: case CAPABILITY_CODE_HOSTNAME: /* Check length. */ if (caphdr.length < cap_minsizes[caphdr.code]) @@ -703,6 +748,10 @@ bgp_capability_parse (struct peer *peer, size_t length, int *mp_capability, if (bgp_capability_hostname (peer, &caphdr)) return -1; break; + case CAPABILITY_CODE_ENHE: + if (bgp_capability_enhe (peer, &caphdr)) + return -1; + break; default: if (caphdr.code > 128) { @@ -1087,6 +1136,26 @@ bgp_open_capability (struct stream *s, struct peer *peer) stream_putc (s, SAFI_MPLS_LABELED_VPN); } #ifdef HAVE_IPV6 + /* Currently supporting RFC-5549 for Link-Local peering only */ + if (CHECK_FLAG (peer->flags, PEER_FLAG_CAPABILITY_ENHE) && + peer->su.sa.sa_family == AF_INET6 && + IN6_IS_ADDR_LINKLOCAL(&peer->su.sin6.sin6_addr)) + { + /* RFC 5549 Extended Next Hop Encoding */ + SET_FLAG (peer->cap, PEER_CAP_ENHE_ADV); + stream_putc (s, BGP_OPEN_OPT_CAP); + stream_putc (s, CAPABILITY_CODE_ENHE_LEN + 2); + stream_putc (s, CAPABILITY_CODE_ENHE); + stream_putc (s, CAPABILITY_CODE_ENHE_LEN); + /* Currently supporting for SAFI_UNICAST only */ + SET_FLAG (peer->af_cap[AFI_IP][SAFI_UNICAST], PEER_CAP_ENHE_AF_ADV); + stream_putw (s, AFI_IP); + stream_putw (s, SAFI_UNICAST); + stream_putw (s, AFI_IP6); + + if (CHECK_FLAG (peer->af_cap[AFI_IP][SAFI_UNICAST], PEER_CAP_ENHE_AF_RCV)) + SET_FLAG (peer->af_cap[AFI_IP][SAFI_UNICAST], PEER_CAP_ENHE_AF_NEGO); + } /* IPv6 unicast. */ if (peer->afc[AFI_IP6][SAFI_UNICAST]) { |