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4efdb9c628
The Bootstrap message RX path needs a RPF check for the BSR address, and this is implemented both incorrectly as well as quite ugly. Clean up and fix case when we have multiple interfaces to the same LAN and/or ECMP nexthops (both would cause message duplication, the former can even cause BSM forwarding loops.) Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/*
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* PIM for Quagga
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* Copyright (C) 2017 Cumulus Networks, Inc.
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* Chirag Shah
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef PIM_NHT_H
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#define PIM_NHT_H
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#include "prefix.h"
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#include <zebra.h>
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#include "zclient.h"
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#include "vrf.h"
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#include "pimd.h"
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#include "pim_rp.h"
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#include "pim_rpf.h"
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/* PIM nexthop cache value structure. */
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struct pim_nexthop_cache {
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struct pim_rpf rpf;
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/* IGP route's metric. */
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uint32_t metric;
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uint32_t distance;
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/* Nexthop number and nexthop linked list. */
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uint8_t nexthop_num;
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struct nexthop *nexthop;
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int64_t last_update;
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uint16_t flags;
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#define PIM_NEXTHOP_VALID (1 << 0)
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#define PIM_NEXTHOP_ANSWER_RECEIVED (1 << 1)
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struct list *rp_list;
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struct hash *upstream_hash;
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/* bsr_count won't currently go above 1 as we only have global_scope,
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* but if anyone adds scope support multiple scopes may NHT-track the
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* same BSR
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*/
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uint32_t bsr_count;
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};
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int pim_parse_nexthop_update(ZAPI_CALLBACK_ARGS);
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int pim_find_or_track_nexthop(struct pim_instance *pim, struct prefix *addr,
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struct pim_upstream *up, struct rp_info *rp,
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struct pim_nexthop_cache *out_pnc);
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void pim_delete_tracked_nexthop(struct pim_instance *pim, struct prefix *addr,
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struct pim_upstream *up, struct rp_info *rp);
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struct pim_nexthop_cache *pim_nexthop_cache_find(struct pim_instance *pim,
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struct pim_rpf *rpf);
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uint32_t pim_compute_ecmp_hash(struct prefix *src, struct prefix *grp);
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int pim_ecmp_nexthop_lookup(struct pim_instance *pim,
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struct pim_nexthop *nexthop, struct prefix *src,
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struct prefix *grp, int neighbor_needed);
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void pim_sendmsg_zebra_rnh(struct pim_instance *pim, struct zclient *zclient,
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struct pim_nexthop_cache *pnc, int command);
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int pim_ecmp_fib_lookup_if_vif_index(struct pim_instance *pim,
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struct prefix *src, struct prefix *grp);
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void pim_rp_nexthop_del(struct rp_info *rp_info);
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bool pim_nexthop_match(struct pim_instance *pim, struct in_addr addr,
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struct in_addr ip_src);
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bool pim_nexthop_match_nht_cache(struct pim_instance *pim, struct in_addr addr,
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struct in_addr ip_src);
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/* for RPF check on BSM message receipt */
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void pim_nht_bsr_add(struct pim_instance *pim, struct in_addr bsr_addr);
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void pim_nht_bsr_del(struct pim_instance *pim, struct in_addr bsr_addr);
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/* RPF(bsr_addr) == src_ip%src_ifp? */
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bool pim_nht_bsr_rpf_check(struct pim_instance *pim, struct in_addr bsr_addr,
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struct interface *src_ifp, struct in_addr src_ip);
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#endif
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