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| author | Vivek Venkatraman <vivek@cumulusnetworks.com> | 2017-03-09 18:55:54 +0100 |
|---|---|---|
| committer | Donald Sharp <sharpd@cumulusnetworks.com> | 2017-04-06 16:32:07 +0200 |
| commit | 28d58fd7b166836029656c29ad8ed9a9e8a744ac (patch) | |
| tree | 549a60873cfe73d04c055447fc599e667cb1d71c /bgpd/bgp_label.c | |
| parent | bgpd: This patch implements the exchange of the BGP-Prefix-SID label index attr (diff) | |
| download | frr-28d58fd7b166836029656c29ad8ed9a9e8a744ac.tar.xz frr-28d58fd7b166836029656c29ad8ed9a9e8a744ac.zip | |
bgpd, lib, zebra: Implement handling of BGP-Prefix-SID label Index
Implement BGP Prefix-SID IETF draft to be able to signal a labeled-unicast
prefix with a label index (segment ID). This makes it easier to deploy
global MPLS labels with BGP, even without other aspects of Segment Routing
implemented.
This patch implements the handling of the BGP-Prefix-SID Label Index
attribute. When received from a peer and the index is acceptable, the local
label is picked up from the SRGB and is programmed as the incoming label as
well as advertised to peers. If the index is not acceptable, no local label
is assigned. The outgoing label will always be the one advertised by the
downstream neighbor.
Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
Diffstat (limited to 'bgpd/bgp_label.c')
| -rw-r--r-- | bgpd/bgp_label.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/bgpd/bgp_label.c b/bgpd/bgp_label.c index e2c4a5404..0c331c5d5 100644 --- a/bgpd/bgp_label.c +++ b/bgpd/bgp_label.c @@ -125,11 +125,14 @@ bgp_adv_label (struct bgp_node *rn, struct bgp_info *ri, struct peer *to, } void -bgp_reg_dereg_for_label (struct bgp_node *rn, int reg) +bgp_reg_dereg_for_label (struct bgp_node *rn, struct bgp_info *ri, + int reg) { struct stream *s; struct prefix *p; int command; + u_int16_t flags = 0; + size_t flags_pos = 0; /* Check socket. */ if (!zclient || zclient->sock < 0) @@ -140,17 +143,29 @@ bgp_reg_dereg_for_label (struct bgp_node *rn, int reg) stream_reset (s); command = (reg) ? ZEBRA_FEC_REGISTER : ZEBRA_FEC_UNREGISTER; zclient_create_header (s, command, VRF_DEFAULT); + flags_pos = stream_get_endp (s); /* save position of 'flags' */ + stream_putw(s, flags); /* initial flags */ stream_putw(s, PREFIX_FAMILY(p)); stream_put_prefix(s, p); - stream_putw_at (s, 0, stream_get_endp (s)); - if (reg) - SET_FLAG (rn->flags, BGP_NODE_REGISTERED_FOR_LABEL); + { + assert (ri); + if (ri->attr->flag & ATTR_FLAG_BIT (BGP_ATTR_LABEL_INDEX)) + { + assert (ri->attr->extra); + flags |= ZEBRA_FEC_REGISTER_LABEL_INDEX; + stream_putl (s, ri->attr->extra->label_index); + } + SET_FLAG (rn->flags, BGP_NODE_REGISTERED_FOR_LABEL); + } else UNSET_FLAG (rn->flags, BGP_NODE_REGISTERED_FOR_LABEL); - zclient_send_message(zclient); - return; + /* Set length and flags */ + stream_putw_at (s, 0, stream_get_endp (s)); + stream_putw_at (s, flags_pos, flags); + + zclient_send_message(zclient); } static int |