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Add the ability to send link-state prefixes that are in the BGP table. Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com> Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* BGP Link-State TLV Serializer/Deserializer
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* Copyright 2023 6WIND S.A.
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*/
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#include <zebra.h>
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#include "bgpd/bgpd.h"
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#include "bgpd/bgp_route.h"
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#include "bgpd/bgp_debug.h"
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#include "bgpd/bgp_errors.h"
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#include "bgpd/bgp_linkstate_tlv.h"
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static uint16_t pnt_decode16(uint8_t **pnt)
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{
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uint16_t data;
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*pnt = ptr_get_be16(*pnt, &data);
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return data;
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}
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int bgp_nlri_parse_linkstate(struct peer *peer, struct attr *attr,
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struct bgp_nlri *packet, int withdraw)
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{
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uint8_t *pnt;
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uint8_t *lim;
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afi_t afi;
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safi_t safi;
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uint16_t length = 0;
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struct prefix p;
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/* Start processing the NLRI - there may be multiple in the MP_REACH */
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pnt = packet->nlri;
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lim = pnt + packet->length;
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afi = packet->afi;
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safi = packet->safi;
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for (; pnt < lim; pnt += length) {
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/* Clear prefix structure. */
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memset(&p, 0, sizeof(p));
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/* All linkstate NLRI begin with NRLI type and length. */
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if (pnt + 4 > lim)
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return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
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p.u.prefix_linkstate.nlri_type = pnt_decode16(&pnt);
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length = pnt_decode16(&pnt);
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/* When packet overflow occur return immediately. */
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if (pnt + length > lim) {
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flog_err(
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EC_BGP_LINKSTATE_PACKET,
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"Link-State NLRI length inconsistent (size %u seen)",
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length);
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return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
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}
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p.family = AF_LINKSTATE;
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p.u.prefix_linkstate.ptr = (uintptr_t)pnt;
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p.prefixlen = length;
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/* Process the route. */
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if (withdraw)
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bgp_withdraw(peer, &p, 0, afi, safi, ZEBRA_ROUTE_BGP,
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BGP_ROUTE_NORMAL, NULL, NULL, 0, NULL);
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else
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bgp_update(peer, &p, 0, attr, afi, safi,
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ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL, NULL,
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NULL, 0, 0, NULL);
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}
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return BGP_NLRI_PARSE_OK;
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}
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/*
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* Encode Link-State prefix in Update (MP_REACH)
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*/
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void bgp_nlri_encode_linkstate(struct stream *s, const struct prefix *p)
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{
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/* NLRI type */
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stream_putw(s, p->u.prefix_linkstate.nlri_type);
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/* Size */
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stream_putw(s, p->prefixlen);
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stream_put(s, (const void *)p->u.prefix_linkstate.ptr, p->prefixlen);
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}
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