/src/frr/pimd/pim_msdp.c

Source (jump to first uncovered line)
// 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;

  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 */
      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;
}

Coverage Report

Created: 2025-07-14 06:48