diff options
Diffstat (limited to 'pimd/pim_msdp.c')
| -rw-r--r-- | pimd/pim_msdp.c | 1448 |
1 files changed, 1448 insertions, 0 deletions
diff --git a/pimd/pim_msdp.c b/pimd/pim_msdp.c new file mode 100644 index 0000000..623c14b --- /dev/null +++ b/pimd/pim_msdp.c @@ -0,0 +1,1448 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IP MSDP for Quagga + * Copyright (C) 2016 Cumulus Networks, Inc. + */ + +#include <zebra.h> + +#include <lib/hash.h> +#include <lib/jhash.h> +#include <lib/log.h> +#include <lib/prefix.h> +#include <lib/sockunion.h> +#include <lib/stream.h> +#include <frrevent.h> +#include <lib/vty.h> +#include <lib/plist.h> +#include <lib/lib_errors.h> + +#include "pimd.h" +#include "pim_memory.h" +#include "pim_instance.h" +#include "pim_iface.h" +#include "pim_rp.h" +#include "pim_str.h" +#include "pim_time.h" +#include "pim_upstream.h" +#include "pim_oil.h" + +#include "pim_msdp.h" +#include "pim_msdp_packet.h" +#include "pim_msdp_socket.h" + +// struct pim_msdp pim_msdp, *msdp = &pim_msdp; + +static void pim_msdp_peer_listen(struct pim_msdp_peer *mp); +static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start); +static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start); +static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, + bool start); +static void pim_msdp_peer_free(struct pim_msdp_peer *mp); +static void pim_msdp_enable(struct pim_instance *pim); +static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start); +static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, + enum pim_msdp_sa_flags flags); +static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2); +static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr); + +/************************ SA cache management ******************************/ +static void pim_msdp_sa_timer_expiry_log(struct pim_msdp_sa *sa, + const char *timer_str) +{ + zlog_debug("MSDP SA %s %s timer expired", sa->sg_str, timer_str); +} + +/* RFC-3618:Sec-5.1 - global active source advertisement timer */ +static void pim_msdp_sa_adv_timer_cb(struct event *t) +{ + struct pim_instance *pim = EVENT_ARG(t); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA advertisement timer expired"); + } + + pim_msdp_sa_adv_timer_setup(pim, true /* start */); + pim_msdp_pkt_sa_tx(pim); +} + +static void pim_msdp_sa_adv_timer_setup(struct pim_instance *pim, bool start) +{ + EVENT_OFF(pim->msdp.sa_adv_timer); + if (start) { + event_add_timer(pim->msdp.master, pim_msdp_sa_adv_timer_cb, pim, + PIM_MSDP_SA_ADVERTISMENT_TIME, + &pim->msdp.sa_adv_timer); + } +} + +/* RFC-3618:Sec-5.3 - SA cache state timer */ +static void pim_msdp_sa_state_timer_cb(struct event *t) +{ + struct pim_msdp_sa *sa; + + sa = EVENT_ARG(t); + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_sa_timer_expiry_log(sa, "state"); + } + + pim_msdp_sa_deref(sa, PIM_MSDP_SAF_PEER); +} + +static void pim_msdp_sa_state_timer_setup(struct pim_msdp_sa *sa, bool start) +{ + EVENT_OFF(sa->sa_state_timer); + if (start) { + event_add_timer(sa->pim->msdp.master, + pim_msdp_sa_state_timer_cb, sa, + PIM_MSDP_SA_HOLD_TIME, &sa->sa_state_timer); + } +} + +static void pim_msdp_sa_upstream_del(struct pim_msdp_sa *sa) +{ + struct pim_upstream *up = sa->up; + if (!up) { + return; + } + + sa->up = NULL; + if (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags)) { + PIM_UPSTREAM_FLAG_UNSET_SRC_MSDP(up->flags); + sa->flags |= PIM_MSDP_SAF_UP_DEL_IN_PROG; + up = pim_upstream_del(sa->pim, up, __func__); + /* re-eval joinDesired; clearing peer-msdp-sa flag can + * cause JD to change + */ + if (up) + pim_upstream_update_join_desired(sa->pim, up); + sa->flags &= ~PIM_MSDP_SAF_UP_DEL_IN_PROG; + } + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s de-referenced SPT", sa->sg_str); + } +} + +static bool pim_msdp_sa_upstream_add_ok(struct pim_msdp_sa *sa, + struct pim_upstream *xg_up) +{ + if (!(sa->flags & PIM_MSDP_SAF_PEER)) { + /* SA should have been rxed from a peer */ + return false; + } + /* check if we are RP */ + if (!I_am_RP(sa->pim, sa->sg.grp)) { + return false; + } + + /* check if we have a (*, G) with a non-empty immediate OIL */ + if (!xg_up) { + pim_sgaddr sg; + + memset(&sg, 0, sizeof(sg)); + sg.grp = sa->sg.grp; + + xg_up = pim_upstream_find(sa->pim, &sg); + } + if (!xg_up || (xg_up->join_state != PIM_UPSTREAM_JOINED)) { + /* join desired will be true for such (*, G) entries so we will + * just look at join_state and let the PIM state machine do the + * rest of + * the magic */ + return false; + } + + return true; +} + +/* Upstream add evaluation needs to happen everytime - + * 1. Peer reference is added or removed. + * 2. The RP for a group changes. + * 3. joinDesired for the associated (*, G) changes + * 4. associated (*, G) is removed - this seems like a bit redundant + * (considering #4); but just in case an entry gets nuked without + * upstream state transition + * */ +static void pim_msdp_sa_upstream_update(struct pim_msdp_sa *sa, + struct pim_upstream *xg_up, + const char *ctx) +{ + struct pim_upstream *up; + + if (!pim_msdp_sa_upstream_add_ok(sa, xg_up)) { + pim_msdp_sa_upstream_del(sa); + return; + } + + if (sa->up) { + /* nothing to do */ + return; + } + + up = pim_upstream_find(sa->pim, &sa->sg); + if (up && (PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags))) { + /* somehow we lost track of the upstream ptr? best log it */ + sa->up = up; + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s SPT reference missing", + sa->sg_str); + } + return; + } + + /* RFC3618: "RP triggers a (S, G) join event towards the data source + * as if a JP message was rxed addressed to the RP itself." */ + up = pim_upstream_add(sa->pim, &sa->sg, NULL /* iif */, + PIM_UPSTREAM_FLAG_MASK_SRC_MSDP, __func__, NULL); + + sa->up = up; + if (up) { + /* update inherited oil */ + pim_upstream_inherited_olist(sa->pim, up); + /* should we also start the kat in parallel? we will need it + * when the + * SA ages out */ + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s referenced SPT", sa->sg_str); + } + } else { + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s SPT reference failed", + sa->sg_str); + } + } +} + +/* release all mem associated with a sa */ +static void pim_msdp_sa_free(struct pim_msdp_sa *sa) +{ + pim_msdp_sa_state_timer_setup(sa, false); + + XFREE(MTYPE_PIM_MSDP_SA, sa); +} + +static struct pim_msdp_sa *pim_msdp_sa_new(struct pim_instance *pim, + pim_sgaddr *sg, struct in_addr rp) +{ + struct pim_msdp_sa *sa; + + sa = XCALLOC(MTYPE_PIM_MSDP_SA, sizeof(*sa)); + + sa->pim = pim; + sa->sg = *sg; + snprintfrr(sa->sg_str, sizeof(sa->sg_str), "%pSG", sg); + sa->rp = rp; + sa->uptime = pim_time_monotonic_sec(); + + /* insert into misc tables for easy access */ + sa = hash_get(pim->msdp.sa_hash, sa, hash_alloc_intern); + listnode_add_sort(pim->msdp.sa_list, sa); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s created", sa->sg_str); + } + + return sa; +} + +static struct pim_msdp_sa *pim_msdp_sa_find(struct pim_instance *pim, + pim_sgaddr *sg) +{ + struct pim_msdp_sa lookup; + + lookup.sg = *sg; + return hash_lookup(pim->msdp.sa_hash, &lookup); +} + +static struct pim_msdp_sa *pim_msdp_sa_add(struct pim_instance *pim, + pim_sgaddr *sg, struct in_addr rp) +{ + struct pim_msdp_sa *sa; + + sa = pim_msdp_sa_find(pim, sg); + if (sa) { + return sa; + } + + return pim_msdp_sa_new(pim, sg, rp); +} + +static void pim_msdp_sa_del(struct pim_msdp_sa *sa) +{ + /* this is somewhat redundant - still want to be careful not to leave + * stale upstream references */ + pim_msdp_sa_upstream_del(sa); + + /* stop timers */ + pim_msdp_sa_state_timer_setup(sa, false /* start */); + + /* remove the entry from various tables */ + listnode_delete(sa->pim->msdp.sa_list, sa); + hash_release(sa->pim->msdp.sa_hash, sa); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s deleted", sa->sg_str); + } + + /* free up any associated memory */ + pim_msdp_sa_free(sa); +} + +static void pim_msdp_sa_peer_ip_set(struct pim_msdp_sa *sa, + struct pim_msdp_peer *mp, struct in_addr rp) +{ + struct pim_msdp_peer *old_mp; + + /* optimize the "no change" case as it will happen + * frequently/periodically */ + if (mp && (sa->peer.s_addr == mp->peer.s_addr)) { + return; + } + + /* any time the peer ip changes also update the rp address */ + if (sa->peer.s_addr != INADDR_ANY) { + old_mp = pim_msdp_peer_find(sa->pim, sa->peer); + if (old_mp && old_mp->sa_cnt) { + --old_mp->sa_cnt; + } + } + + if (mp) { + ++mp->sa_cnt; + sa->peer = mp->peer; + } else { + sa->peer.s_addr = PIM_NET_INADDR_ANY; + } + sa->rp = rp; +} + +/* When a local active-source is removed there is no way to withdraw the + * source from peers. We will simply remove it from the SA cache so it will + * not be sent in supsequent SA updates. Peers will consequently timeout the + * SA. + * Similarly a "peer-added" SA is never explicitly deleted. It is simply + * aged out overtime if not seen in the SA updates from the peers. + * XXX: should we provide a knob to drop entries learnt from a peer when the + * peer goes down? */ +static void pim_msdp_sa_deref(struct pim_msdp_sa *sa, + enum pim_msdp_sa_flags flags) +{ + bool update_up = false; + + if ((sa->flags & PIM_MSDP_SAF_LOCAL)) { + if (flags & PIM_MSDP_SAF_LOCAL) { + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s local reference removed", + sa->sg_str); + } + if (sa->pim->msdp.local_cnt) + --sa->pim->msdp.local_cnt; + } + } + + if ((sa->flags & PIM_MSDP_SAF_PEER)) { + if (flags & PIM_MSDP_SAF_PEER) { + struct in_addr rp; + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s peer reference removed", + sa->sg_str); + } + pim_msdp_sa_state_timer_setup(sa, false /* start */); + rp.s_addr = INADDR_ANY; + pim_msdp_sa_peer_ip_set(sa, NULL /* mp */, rp); + /* if peer ref was removed we need to remove the msdp + * reference on the + * msdp entry */ + update_up = true; + } + } + + sa->flags &= ~flags; + if (update_up) { + pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "sa-deref"); + } + + if (!(sa->flags & PIM_MSDP_SAF_REF)) { + pim_msdp_sa_del(sa); + } +} + +void pim_msdp_sa_ref(struct pim_instance *pim, struct pim_msdp_peer *mp, + pim_sgaddr *sg, struct in_addr rp) +{ + struct pim_msdp_sa *sa; + struct rp_info *rp_info; + struct prefix grp; + + sa = pim_msdp_sa_add(pim, sg, rp); + if (!sa) { + return; + } + + /* reference it */ + if (mp) { + if (!(sa->flags & PIM_MSDP_SAF_PEER)) { + sa->flags |= PIM_MSDP_SAF_PEER; + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s added by peer", + sa->sg_str); + } + } + pim_msdp_sa_peer_ip_set(sa, mp, rp); + /* start/re-start the state timer to prevent cache expiry */ + pim_msdp_sa_state_timer_setup(sa, true /* start */); + /* We re-evaluate SA "SPT-trigger" everytime we hear abt it from + * a + * peer. XXX: If this becomes too much of a periodic overhead we + * can make it event based */ + pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, "peer-ref"); + } else { + if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { + sa->flags |= PIM_MSDP_SAF_LOCAL; + ++sa->pim->msdp.local_cnt; + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP SA %s added locally", + sa->sg_str); + } + /* send an immediate SA update to peers */ + pim_addr_to_prefix(&grp, sa->sg.grp); + rp_info = pim_rp_find_match_group(pim, &grp); + if (rp_info) { + sa->rp = rp_info->rp.rpf_addr; + } else + { + sa->rp = pim->msdp.originator_id; + } + sa->rp = pim->msdp.originator_id; + pim_msdp_pkt_sa_tx_one(sa); + } + sa->flags &= ~PIM_MSDP_SAF_STALE; + } +} + +/* The following criteria must be met to originate an SA from the MSDP + * speaker - + * 1. KAT must be running i.e. source is active. + * 2. We must be RP for the group. + * 3. Source must be registrable to the RP (this is where the RFC is vague + * and especially ambiguous in CLOS networks; with anycast RP all sources + * are potentially registrable to all RPs in the domain). We assume #3 is + * satisfied if - + * a. We are also the FHR-DR for the source (OR) + * b. We rxed a pim register (null or data encapsulated) within the last + * (3 * (1.5 * register_suppression_timer))). + */ +static bool pim_msdp_sa_local_add_ok(struct pim_upstream *up) +{ + struct pim_instance *pim = up->channel_oil->pim; + + if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { + return false; + } + + if (!pim_upstream_is_kat_running(up)) + /* stream is not active */ + return false; + + if (!I_am_RP(pim, up->sg.grp)) { + /* we are not RP for the group */ + return false; + } + + /* we are the FHR-DR for this stream or we are RP and have seen + * registers + * from a FHR for this source */ + if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || up->t_msdp_reg_timer) { + return true; + } + + return false; +} + +static void pim_msdp_sa_local_add(struct pim_instance *pim, pim_sgaddr *sg) +{ + struct in_addr rp; + rp.s_addr = INADDR_ANY; + pim_msdp_sa_ref(pim, NULL /* mp */, sg, rp); +} + +void pim_msdp_sa_local_del(struct pim_instance *pim, pim_sgaddr *sg) +{ + struct pim_msdp_sa *sa; + + sa = pim_msdp_sa_find(pim, sg); + if (sa) { + pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); + } +} + +/* we need to be very cautious with this API as SA del too can trigger an + * upstream del and we will get stuck in a simple loop */ +static void pim_msdp_sa_local_del_on_up_del(struct pim_instance *pim, + pim_sgaddr *sg) +{ + struct pim_msdp_sa *sa; + + sa = pim_msdp_sa_find(pim, sg); + if (sa) { + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP local sa %s del on up del", + sa->sg_str); + } + + /* if there is no local reference escape */ + if (!(sa->flags & PIM_MSDP_SAF_LOCAL)) { + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP local sa %s del; no local ref", + sa->sg_str); + } + return; + } + + if (sa->flags & PIM_MSDP_SAF_UP_DEL_IN_PROG) { + /* MSDP is the one that triggered the upstream del. if + * this happens + * we most certainly have a bug in the PIM upstream + * state machine. We + * will not have a local reference unless the KAT is + * running. And if the + * KAT is running there MUST be an additional + * source-stream reference to + * the flow. Accounting for such cases requires lot of + * changes; perhaps + * address this in the next release? - XXX */ + flog_err( + EC_LIB_DEVELOPMENT, + "MSDP sa %s SPT teardown is causing the local entry to be removed", + sa->sg_str); + return; + } + + /* we are dropping the sa on upstream del we should not have an + * upstream reference */ + if (sa->up) { + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP local sa %s del; up non-NULL", + sa->sg_str); + } + sa->up = NULL; + } + pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); + } +} + +/* Local SA qualification needs to be re-evaluated when - + * 1. KAT is started or stopped + * 2. on RP changes + * 3. Whenever FHR status changes for a (S,G) - XXX - currently there + * is no clear path to transition an entry out of "MASK_FHR" need + * to discuss this with Donald. May result in some strangeness if the + * FHR is also the RP. + * 4. When msdp_reg timer is started or stopped + */ +void pim_msdp_sa_local_update(struct pim_upstream *up) +{ + struct pim_instance *pim = up->channel_oil->pim; + + if (pim_msdp_sa_local_add_ok(up)) { + pim_msdp_sa_local_add(pim, &up->sg); + } else { + pim_msdp_sa_local_del(pim, &up->sg); + } +} + +static void pim_msdp_sa_local_setup(struct pim_instance *pim) +{ + struct pim_upstream *up; + + frr_each (rb_pim_upstream, &pim->upstream_head, up) + pim_msdp_sa_local_update(up); +} + +/* whenever the RP changes we need to re-evaluate the "local" SA-cache */ +/* XXX: needs to be tested */ +void pim_msdp_i_am_rp_changed(struct pim_instance *pim) +{ + struct listnode *sanode; + struct listnode *nextnode; + struct pim_msdp_sa *sa; + + if (!(pim->msdp.flags & PIM_MSDPF_ENABLE)) { + /* if the feature is not enabled do nothing */ + return; + } + + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP i_am_rp changed"); + } + + /* mark all local entries as stale */ + for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { + if (sa->flags & PIM_MSDP_SAF_LOCAL) { + sa->flags |= PIM_MSDP_SAF_STALE; + } + } + + /* re-setup local SA entries */ + pim_msdp_sa_local_setup(pim); + + for (ALL_LIST_ELEMENTS(pim->msdp.sa_list, sanode, nextnode, sa)) { + /* purge stale SA entries */ + if (sa->flags & PIM_MSDP_SAF_STALE) { + /* clear the stale flag; the entry may be kept even + * after + * "local-deref" */ + sa->flags &= ~PIM_MSDP_SAF_STALE; + /* sa_deref can end up freeing the sa; so don't access + * contents after */ + pim_msdp_sa_deref(sa, PIM_MSDP_SAF_LOCAL); + } else { + /* if the souce is still active check if we can + * influence SPT */ + pim_msdp_sa_upstream_update(sa, NULL /* xg_up */, + "rp-change"); + } + } +} + +/* We track the join state of (*, G) entries. If G has sources in the SA-cache + * we need to setup or teardown SPT when the JoinDesired status changes for + * (*, G) */ +void pim_msdp_up_join_state_changed(struct pim_instance *pim, + struct pim_upstream *xg_up) +{ + struct listnode *sanode; + struct pim_msdp_sa *sa; + + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP join state changed for %s", xg_up->sg_str); + } + + /* If this is not really an XG entry just move on */ + if (!pim_addr_is_any(xg_up->sg.src) || pim_addr_is_any(xg_up->sg.grp)) { + return; + } + + /* XXX: Need to maintain SAs per-group to avoid all this unnecessary + * walking */ + for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { + if (pim_addr_cmp(sa->sg.grp, xg_up->sg.grp)) { + continue; + } + pim_msdp_sa_upstream_update(sa, xg_up, "up-jp-change"); + } +} + +static void pim_msdp_up_xg_del(struct pim_instance *pim, pim_sgaddr *sg) +{ + struct listnode *sanode; + struct pim_msdp_sa *sa; + + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP %pSG del", sg); + } + + /* If this is not really an XG entry just move on */ + if (!pim_addr_is_any(sg->src) || pim_addr_is_any(sg->grp)) { + return; + } + + /* XXX: Need to maintain SAs per-group to avoid all this unnecessary + * walking */ + for (ALL_LIST_ELEMENTS_RO(pim->msdp.sa_list, sanode, sa)) { + if (pim_addr_cmp(sa->sg.grp, sg->grp)) { + continue; + } + pim_msdp_sa_upstream_update(sa, NULL /* xg */, "up-jp-change"); + } +} + +void pim_msdp_up_del(struct pim_instance *pim, pim_sgaddr *sg) +{ + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP up %pSG del", sg); + } + if (pim_addr_is_any(sg->src)) { + pim_msdp_up_xg_del(pim, sg); + } else { + pim_msdp_sa_local_del_on_up_del(pim, sg); + } +} + +/* sa hash and peer list helpers */ +static unsigned int pim_msdp_sa_hash_key_make(const void *p) +{ + const struct pim_msdp_sa *sa = p; + + return pim_sgaddr_hash(sa->sg, 0); +} + +static bool pim_msdp_sa_hash_eq(const void *p1, const void *p2) +{ + const struct pim_msdp_sa *sa1 = p1; + const struct pim_msdp_sa *sa2 = p2; + + return !pim_sgaddr_cmp(sa1->sg, sa2->sg); +} + +static int pim_msdp_sa_comp(const void *p1, const void *p2) +{ + const struct pim_msdp_sa *sa1 = p1; + const struct pim_msdp_sa *sa2 = p2; + + return pim_sgaddr_cmp(sa1->sg, sa2->sg); +} + +/* RFC-3618:Sec-10.1.3 - Peer-RPF forwarding */ +/* XXX: this can use a bit of refining and extensions */ +bool pim_msdp_peer_rpf_check(struct pim_msdp_peer *mp, struct in_addr rp) +{ + struct pim_nexthop nexthop = {0}; + + if (mp->peer.s_addr == rp.s_addr) { + return true; + } + + /* check if the MSDP peer is the nexthop for the RP */ + if (pim_nexthop_lookup(mp->pim, &nexthop, rp, 0) && + nexthop.mrib_nexthop_addr.s_addr == mp->peer.s_addr) { + return true; + } + + return false; +} + +/************************ Peer session management **************************/ +char *pim_msdp_state_dump(enum pim_msdp_peer_state state, char *buf, + int buf_size) +{ + switch (state) { + case PIM_MSDP_DISABLED: + snprintf(buf, buf_size, "%s", "disabled"); + break; + case PIM_MSDP_INACTIVE: + snprintf(buf, buf_size, "%s", "inactive"); + break; + case PIM_MSDP_LISTEN: + snprintf(buf, buf_size, "%s", "listen"); + break; + case PIM_MSDP_CONNECTING: + snprintf(buf, buf_size, "%s", "connecting"); + break; + case PIM_MSDP_ESTABLISHED: + snprintf(buf, buf_size, "%s", "established"); + break; + default: + snprintf(buf, buf_size, "unk-%d", state); + } + return buf; +} + +static void pim_msdp_peer_state_chg_log(struct pim_msdp_peer *mp) +{ + char state_str[PIM_MSDP_STATE_STRLEN]; + + pim_msdp_state_dump(mp->state, state_str, sizeof(state_str)); + zlog_debug("MSDP peer %s state chg to %s", mp->key_str, state_str); +} + +/* MSDP Connection State Machine actions (defined in RFC-3618:Sec-11.2) */ +/* 11.2.A2: active peer - start connect retry timer; when the timer fires + * a tcp connection will be made */ +static void pim_msdp_peer_connect(struct pim_msdp_peer *mp) +{ + mp->state = PIM_MSDP_CONNECTING; + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_state_chg_log(mp); + } + + pim_msdp_peer_cr_timer_setup(mp, true /* start */); +} + +/* 11.2.A3: passive peer - just listen for connections */ +static void pim_msdp_peer_listen(struct pim_msdp_peer *mp) +{ + mp->state = PIM_MSDP_LISTEN; + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_state_chg_log(mp); + } + + /* this is interntionally asymmetric i.e. we set up listen-socket when + * the + * first listening peer is configured; but don't bother tearing it down + * when + * all the peers go down */ + pim_msdp_sock_listen(mp->pim); +} + +/* 11.2.A4 and 11.2.A5: transition active or passive peer to + * established state */ +void pim_msdp_peer_established(struct pim_msdp_peer *mp) +{ + if (mp->state != PIM_MSDP_ESTABLISHED) { + ++mp->est_flaps; + } + + mp->state = PIM_MSDP_ESTABLISHED; + mp->uptime = pim_time_monotonic_sec(); + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_state_chg_log(mp); + } + + /* stop retry timer on active peers */ + pim_msdp_peer_cr_timer_setup(mp, false /* start */); + + /* send KA; start KA and hold timers */ + pim_msdp_pkt_ka_tx(mp); + pim_msdp_peer_ka_timer_setup(mp, true /* start */); + pim_msdp_peer_hold_timer_setup(mp, true /* start */); + + pim_msdp_pkt_sa_tx_to_one_peer(mp); + + PIM_MSDP_PEER_WRITE_ON(mp); + PIM_MSDP_PEER_READ_ON(mp); +} + +/* 11.2.A6, 11.2.A7 and 11.2.A8: shutdown the peer tcp connection */ +void pim_msdp_peer_stop_tcp_conn(struct pim_msdp_peer *mp, bool chg_state) +{ + if (chg_state) { + if (mp->state == PIM_MSDP_ESTABLISHED) { + ++mp->est_flaps; + } + mp->state = PIM_MSDP_INACTIVE; + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_state_chg_log(mp); + } + } + + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP peer %s pim_msdp_peer_stop_tcp_conn", + mp->key_str); + } + /* stop read and write threads */ + PIM_MSDP_PEER_READ_OFF(mp); + PIM_MSDP_PEER_WRITE_OFF(mp); + + /* reset buffers */ + mp->packet_size = 0; + if (mp->ibuf) + stream_reset(mp->ibuf); + if (mp->obuf) + stream_fifo_clean(mp->obuf); + + /* stop all peer timers */ + pim_msdp_peer_ka_timer_setup(mp, false /* start */); + pim_msdp_peer_cr_timer_setup(mp, false /* start */); + pim_msdp_peer_hold_timer_setup(mp, false /* start */); + + /* close connection */ + if (mp->fd >= 0) { + close(mp->fd); + mp->fd = -1; + } +} + +/* RFC-3618:Sec-5.6 - stop the peer tcp connection and startover */ +void pim_msdp_peer_reset_tcp_conn(struct pim_msdp_peer *mp, const char *rc_str) +{ + if (PIM_DEBUG_EVENTS) { + zlog_debug("MSDP peer %s tcp reset %s", mp->key_str, rc_str); + snprintf(mp->last_reset, sizeof(mp->last_reset), "%s", rc_str); + } + + /* close the connection and transition to listening or connecting */ + pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); + if (PIM_MSDP_PEER_IS_LISTENER(mp)) { + pim_msdp_peer_listen(mp); + } else { + pim_msdp_peer_connect(mp); + } +} + +static void pim_msdp_peer_timer_expiry_log(struct pim_msdp_peer *mp, + const char *timer_str) +{ + zlog_debug("MSDP peer %s %s timer expired", mp->key_str, timer_str); +} + +/* RFC-3618:Sec-5.4 - peer hold timer */ +static void pim_msdp_peer_hold_timer_cb(struct event *t) +{ + struct pim_msdp_peer *mp; + + mp = EVENT_ARG(t); + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_timer_expiry_log(mp, "hold"); + } + + if (mp->state != PIM_MSDP_ESTABLISHED) { + return; + } + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_state_chg_log(mp); + } + pim_msdp_peer_reset_tcp_conn(mp, "ht-expired"); +} + +static void pim_msdp_peer_hold_timer_setup(struct pim_msdp_peer *mp, bool start) +{ + struct pim_instance *pim = mp->pim; + EVENT_OFF(mp->hold_timer); + if (start) { + event_add_timer(pim->msdp.master, pim_msdp_peer_hold_timer_cb, + mp, pim->msdp.hold_time, &mp->hold_timer); + } +} + + +/* RFC-3618:Sec-5.5 - peer keepalive timer */ +static void pim_msdp_peer_ka_timer_cb(struct event *t) +{ + struct pim_msdp_peer *mp; + + mp = EVENT_ARG(t); + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_timer_expiry_log(mp, "ka"); + } + + pim_msdp_pkt_ka_tx(mp); + pim_msdp_peer_ka_timer_setup(mp, true /* start */); +} + +static void pim_msdp_peer_ka_timer_setup(struct pim_msdp_peer *mp, bool start) +{ + EVENT_OFF(mp->ka_timer); + if (start) { + event_add_timer(mp->pim->msdp.master, pim_msdp_peer_ka_timer_cb, + mp, mp->pim->msdp.keep_alive, &mp->ka_timer); + } +} + +static void pim_msdp_peer_active_connect(struct pim_msdp_peer *mp) +{ + int rc; + ++mp->conn_attempts; + rc = pim_msdp_sock_connect(mp); + + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP peer %s pim_msdp_peer_active_connect: %d", + mp->key_str, rc); + } + + switch (rc) { + case connect_error: + case -1: + /* connect failed restart the connect-retry timer */ + pim_msdp_peer_cr_timer_setup(mp, true /* start */); + break; + + case connect_success: + /* connect was sucessful move to established */ + pim_msdp_peer_established(mp); + break; + + case connect_in_progress: + /* for NB content we need to wait till sock is readable or + * writeable */ + PIM_MSDP_PEER_WRITE_ON(mp); + PIM_MSDP_PEER_READ_ON(mp); + /* also restart connect-retry timer to reset the socket if + * connect is + * not sucessful */ + pim_msdp_peer_cr_timer_setup(mp, true /* start */); + break; + } +} + +/* RFC-3618:Sec-5.6 - connection retry on active peer */ +static void pim_msdp_peer_cr_timer_cb(struct event *t) +{ + struct pim_msdp_peer *mp; + + mp = EVENT_ARG(t); + + if (PIM_DEBUG_MSDP_EVENTS) { + pim_msdp_peer_timer_expiry_log(mp, "connect-retry"); + } + + if (mp->state != PIM_MSDP_CONNECTING || PIM_MSDP_PEER_IS_LISTENER(mp)) { + return; + } + + pim_msdp_peer_active_connect(mp); +} + +static void pim_msdp_peer_cr_timer_setup(struct pim_msdp_peer *mp, bool start) +{ + EVENT_OFF(mp->cr_timer); + if (start) { + event_add_timer(mp->pim->msdp.master, pim_msdp_peer_cr_timer_cb, + mp, mp->pim->msdp.connection_retry, + &mp->cr_timer); + } +} + +/* if a valid packet is rxed from the peer we can restart hold timer */ +void pim_msdp_peer_pkt_rxed(struct pim_msdp_peer *mp) +{ + if (mp->state == PIM_MSDP_ESTABLISHED) { + pim_msdp_peer_hold_timer_setup(mp, true /* start */); + } +} + +/* if a valid packet is txed to the peer we can restart ka timer and avoid + * unnecessary ka noise in the network */ +void pim_msdp_peer_pkt_txed(struct pim_msdp_peer *mp) +{ + if (mp->state == PIM_MSDP_ESTABLISHED) { + pim_msdp_peer_ka_timer_setup(mp, true /* start */); + if (PIM_DEBUG_MSDP_INTERNAL) { + zlog_debug("MSDP ka timer restart on pkt tx to %s", + mp->key_str); + } + } +} + +static void pim_msdp_addr2su(union sockunion *su, struct in_addr addr) +{ + sockunion_init(su); + su->sin.sin_addr = addr; + su->sin.sin_family = AF_INET; +#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN + su->sin.sin_len = sizeof(struct sockaddr_in); +#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ +} + +/* 11.2.A1: create a new peer and transition state to listen or connecting */ +struct pim_msdp_peer *pim_msdp_peer_add(struct pim_instance *pim, + const struct in_addr *peer, + const struct in_addr *local, + const char *mesh_group_name) +{ + struct pim_msdp_peer *mp; + + pim_msdp_enable(pim); + + mp = XCALLOC(MTYPE_PIM_MSDP_PEER, sizeof(*mp)); + + mp->pim = pim; + mp->peer = *peer; + pim_inet4_dump("<peer?>", mp->peer, mp->key_str, sizeof(mp->key_str)); + pim_msdp_addr2su(&mp->su_peer, mp->peer); + mp->local = *local; + /* XXX: originator_id setting needs to move to the mesh group */ + pim->msdp.originator_id = *local; + pim_msdp_addr2su(&mp->su_local, mp->local); + if (mesh_group_name) + mp->mesh_group_name = + XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); + + mp->state = PIM_MSDP_INACTIVE; + mp->fd = -1; + strlcpy(mp->last_reset, "-", sizeof(mp->last_reset)); + /* higher IP address is listener */ + if (ntohl(mp->local.s_addr) > ntohl(mp->peer.s_addr)) { + mp->flags |= PIM_MSDP_PEERF_LISTENER; + } + + /* setup packet buffers */ + mp->ibuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); + mp->obuf = stream_fifo_new(); + + /* insert into misc tables for easy access */ + mp = hash_get(pim->msdp.peer_hash, mp, hash_alloc_intern); + listnode_add_sort(pim->msdp.peer_list, mp); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP peer %s created", mp->key_str); + + pim_msdp_peer_state_chg_log(mp); + } + + /* fireup the connect state machine */ + if (PIM_MSDP_PEER_IS_LISTENER(mp)) { + pim_msdp_peer_listen(mp); + } else { + pim_msdp_peer_connect(mp); + } + return mp; +} + +struct pim_msdp_peer *pim_msdp_peer_find(struct pim_instance *pim, + struct in_addr peer_addr) +{ + struct pim_msdp_peer lookup; + + lookup.peer = peer_addr; + return hash_lookup(pim->msdp.peer_hash, &lookup); +} + +/* release all mem associated with a peer */ +static void pim_msdp_peer_free(struct pim_msdp_peer *mp) +{ + /* + * Let's make sure we are not running when we delete + * the underlying data structure + */ + pim_msdp_peer_stop_tcp_conn(mp, false); + + if (mp->ibuf) { + stream_free(mp->ibuf); + } + + if (mp->obuf) { + stream_fifo_free(mp->obuf); + } + + XFREE(MTYPE_PIM_MSDP_MG_NAME, mp->mesh_group_name); + + mp->pim = NULL; + XFREE(MTYPE_PIM_MSDP_PEER, mp); +} + +/* delete the peer config */ +void pim_msdp_peer_del(struct pim_msdp_peer **mp) +{ + if (*mp == NULL) + return; + + /* stop the tcp connection and shutdown all timers */ + pim_msdp_peer_stop_tcp_conn(*mp, true /* chg_state */); + + /* remove the session from various tables */ + listnode_delete((*mp)->pim->msdp.peer_list, *mp); + hash_release((*mp)->pim->msdp.peer_hash, *mp); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP peer %s deleted", (*mp)->key_str); + } + + /* free up any associated memory */ + pim_msdp_peer_free(*mp); + *mp = NULL; +} + +void pim_msdp_peer_change_source(struct pim_msdp_peer *mp, + const struct in_addr *addr) +{ + pim_msdp_peer_stop_tcp_conn(mp, true); + + mp->local = *addr; + + if (PIM_MSDP_PEER_IS_LISTENER(mp)) + pim_msdp_peer_listen(mp); + else + pim_msdp_peer_connect(mp); +} + +/* peer hash and peer list helpers */ +static unsigned int pim_msdp_peer_hash_key_make(const void *p) +{ + const struct pim_msdp_peer *mp = p; + return (jhash_1word(mp->peer.s_addr, 0)); +} + +static bool pim_msdp_peer_hash_eq(const void *p1, const void *p2) +{ + const struct pim_msdp_peer *mp1 = p1; + const struct pim_msdp_peer *mp2 = p2; + + return (mp1->peer.s_addr == mp2->peer.s_addr); +} + +static int pim_msdp_peer_comp(const void *p1, const void *p2) +{ + const struct pim_msdp_peer *mp1 = p1; + const struct pim_msdp_peer *mp2 = p2; + + if (ntohl(mp1->peer.s_addr) < ntohl(mp2->peer.s_addr)) + return -1; + + if (ntohl(mp1->peer.s_addr) > ntohl(mp2->peer.s_addr)) + return 1; + + return 0; +} + +/************************** Mesh group management **************************/ +void pim_msdp_mg_free(struct pim_instance *pim, struct pim_msdp_mg **mgp) +{ + struct pim_msdp_mg_mbr *mbr; + struct listnode *n, *nn; + + if (*mgp == NULL) + return; + + /* SIP is being removed - tear down all active peer sessions */ + for (ALL_LIST_ELEMENTS((*mgp)->mbr_list, n, nn, mbr)) + pim_msdp_mg_mbr_del((*mgp), mbr); + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP mesh-group %s deleted", + (*mgp)->mesh_group_name); + } + + XFREE(MTYPE_PIM_MSDP_MG_NAME, (*mgp)->mesh_group_name); + + if ((*mgp)->mbr_list) + list_delete(&(*mgp)->mbr_list); + + SLIST_REMOVE(&pim->msdp.mglist, (*mgp), pim_msdp_mg, mg_entry); + XFREE(MTYPE_PIM_MSDP_MG, (*mgp)); +} + +struct pim_msdp_mg *pim_msdp_mg_new(struct pim_instance *pim, + const char *mesh_group_name) +{ + struct pim_msdp_mg *mg; + + mg = XCALLOC(MTYPE_PIM_MSDP_MG, sizeof(*mg)); + + mg->mesh_group_name = XSTRDUP(MTYPE_PIM_MSDP_MG_NAME, mesh_group_name); + mg->mbr_list = list_new(); + mg->mbr_list->del = (void (*)(void *))pim_msdp_mg_mbr_free; + mg->mbr_list->cmp = (int (*)(void *, void *))pim_msdp_mg_mbr_comp; + + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP mesh-group %s created", mg->mesh_group_name); + } + + SLIST_INSERT_HEAD(&pim->msdp.mglist, mg, mg_entry); + + return mg; +} + +static int pim_msdp_mg_mbr_comp(const void *p1, const void *p2) +{ + const struct pim_msdp_mg_mbr *mbr1 = p1; + const struct pim_msdp_mg_mbr *mbr2 = p2; + + if (ntohl(mbr1->mbr_ip.s_addr) < ntohl(mbr2->mbr_ip.s_addr)) + return -1; + + if (ntohl(mbr1->mbr_ip.s_addr) > ntohl(mbr2->mbr_ip.s_addr)) + return 1; + + return 0; +} + +static void pim_msdp_mg_mbr_free(struct pim_msdp_mg_mbr *mbr) +{ + XFREE(MTYPE_PIM_MSDP_MG_MBR, mbr); +} + +void pim_msdp_mg_mbr_del(struct pim_msdp_mg *mg, struct pim_msdp_mg_mbr *mbr) +{ + /* Delete active peer session if any */ + if (mbr->mp) { + pim_msdp_peer_del(&mbr->mp); + } + + listnode_delete(mg->mbr_list, mbr); + if (PIM_DEBUG_MSDP_EVENTS) { + char ip_str[INET_ADDRSTRLEN]; + pim_inet4_dump("<mbr?>", mbr->mbr_ip, ip_str, sizeof(ip_str)); + zlog_debug("MSDP mesh-group %s mbr %s deleted", + mg->mesh_group_name, ip_str); + } + pim_msdp_mg_mbr_free(mbr); + if (mg->mbr_cnt) { + --mg->mbr_cnt; + } +} + +static void pim_msdp_src_del(struct pim_msdp_mg *mg) +{ + struct pim_msdp_mg_mbr *mbr; + struct listnode *mbr_node; + + /* SIP is being removed - tear down all active peer sessions */ + for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) { + if (mbr->mp) + pim_msdp_peer_del(&mbr->mp); + } + if (PIM_DEBUG_MSDP_EVENTS) { + zlog_debug("MSDP mesh-group %s src cleared", + mg->mesh_group_name); + } +} + +/*********************** MSDP feature APIs *********************************/ +int pim_msdp_config_write(struct pim_instance *pim, struct vty *vty, + const char *spaces) +{ + struct pim_msdp_mg *mg; + struct listnode *mbrnode; + struct pim_msdp_mg_mbr *mbr; + char src_str[INET_ADDRSTRLEN]; + int count = 0; + + if (SLIST_EMPTY(&pim->msdp.mglist)) + return count; + + SLIST_FOREACH (mg, &pim->msdp.mglist, mg_entry) { + if (mg->src_ip.s_addr != INADDR_ANY) { + pim_inet4_dump("<src?>", mg->src_ip, src_str, + sizeof(src_str)); + vty_out(vty, "%sip msdp mesh-group %s source %s\n", + spaces, mg->mesh_group_name, src_str); + ++count; + } + + for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbrnode, mbr)) { + vty_out(vty, "%sip msdp mesh-group %s member %pI4\n", + spaces, mg->mesh_group_name, &mbr->mbr_ip); + ++count; + } + } + + return count; +} + +bool pim_msdp_peer_config_write(struct vty *vty, struct pim_instance *pim, + const char *spaces) +{ + struct pim_msdp_peer *mp; + struct listnode *node; + bool written = false; + + for (ALL_LIST_ELEMENTS_RO(pim->msdp.peer_list, node, mp)) { + /* Skip meshed group peers. */ + if (mp->flags & PIM_MSDP_PEERF_IN_GROUP) + continue; + + vty_out(vty, "%sip msdp peer %pI4 source %pI4\n", spaces, + &mp->peer, &mp->local); + written = true; + } + + return written; +} + +/* Enable feature including active/periodic timers etc. on the first peer + * config. Till then MSDP should just stay quiet. */ +static void pim_msdp_enable(struct pim_instance *pim) +{ + if (pim->msdp.flags & PIM_MSDPF_ENABLE) { + /* feature is already enabled */ + return; + } + pim->msdp.flags |= PIM_MSDPF_ENABLE; + pim->msdp.work_obuf = stream_new(PIM_MSDP_MAX_PACKET_SIZE); + pim_msdp_sa_adv_timer_setup(pim, true /* start */); + /* setup sa cache based on local sources */ + pim_msdp_sa_local_setup(pim); +} + +/* MSDP init */ +void pim_msdp_init(struct pim_instance *pim, struct event_loop *master) +{ + pim->msdp.master = master; + char hash_name[64]; + + snprintf(hash_name, sizeof(hash_name), "PIM %s MSDP Peer Hash", + pim->vrf->name); + pim->msdp.peer_hash = hash_create(pim_msdp_peer_hash_key_make, + pim_msdp_peer_hash_eq, hash_name); + pim->msdp.peer_list = list_new(); + pim->msdp.peer_list->del = (void (*)(void *))pim_msdp_peer_free; + pim->msdp.peer_list->cmp = (int (*)(void *, void *))pim_msdp_peer_comp; + + snprintf(hash_name, sizeof(hash_name), "PIM %s MSDP SA Hash", + pim->vrf->name); + pim->msdp.sa_hash = hash_create(pim_msdp_sa_hash_key_make, + pim_msdp_sa_hash_eq, hash_name); + pim->msdp.sa_list = list_new(); + pim->msdp.sa_list->del = (void (*)(void *))pim_msdp_sa_free; + pim->msdp.sa_list->cmp = (int (*)(void *, void *))pim_msdp_sa_comp; +} + +/* counterpart to MSDP init; XXX: unused currently */ +void pim_msdp_exit(struct pim_instance *pim) +{ + struct pim_msdp_mg *mg; + + pim_msdp_sa_adv_timer_setup(pim, false); + + /* Stop listener and delete all peer sessions */ + while ((mg = SLIST_FIRST(&pim->msdp.mglist)) != NULL) + pim_msdp_mg_free(pim, &mg); + + hash_clean_and_free(&pim->msdp.peer_hash, NULL); + + if (pim->msdp.peer_list) { + list_delete(&pim->msdp.peer_list); + } + + hash_clean_and_free(&pim->msdp.sa_hash, NULL); + + if (pim->msdp.sa_list) { + list_delete(&pim->msdp.sa_list); + } + + if (pim->msdp.work_obuf) + stream_free(pim->msdp.work_obuf); + pim->msdp.work_obuf = NULL; +} + +void pim_msdp_mg_src_add(struct pim_instance *pim, struct pim_msdp_mg *mg, + struct in_addr *ai) +{ + struct pim_msdp_mg_mbr *mbr; + struct listnode *mbr_node; + + /* Stop all connections and remove data structures. */ + pim_msdp_src_del(mg); + + /* Set new address. */ + mg->src_ip = *ai; + + /* No new address, disable everyone. */ + if (ai->s_addr == INADDR_ANY) { + if (PIM_DEBUG_MSDP_EVENTS) + zlog_debug("MSDP mesh-group %s src unset", + mg->mesh_group_name); + return; + } + + /* Create data structures and start TCP connection. */ + for (ALL_LIST_ELEMENTS_RO(mg->mbr_list, mbr_node, mbr)) + mbr->mp = pim_msdp_peer_add(pim, &mbr->mbr_ip, &mg->src_ip, + mg->mesh_group_name); + + if (PIM_DEBUG_MSDP_EVENTS) + zlog_debug("MSDP mesh-group %s src %pI4 set", + mg->mesh_group_name, &mg->src_ip); +} + +struct pim_msdp_mg_mbr *pim_msdp_mg_mbr_add(struct pim_instance *pim, + struct pim_msdp_mg *mg, + struct in_addr *ia) +{ + struct pim_msdp_mg_mbr *mbr; + + mbr = XCALLOC(MTYPE_PIM_MSDP_MG_MBR, sizeof(*mbr)); + mbr->mbr_ip = *ia; + listnode_add_sort(mg->mbr_list, mbr); + + /* if valid SIP has been configured add peer session */ + if (mg->src_ip.s_addr != INADDR_ANY) + mbr->mp = pim_msdp_peer_add(pim, &mbr->mbr_ip, &mg->src_ip, + mg->mesh_group_name); + + if (PIM_DEBUG_MSDP_EVENTS) + zlog_debug("MSDP mesh-group %s mbr %pI4 created", + mg->mesh_group_name, &mbr->mbr_ip); + + ++mg->mbr_cnt; + + return mbr; +} |