[mirror_frr.git] / pimd / pim_rpf.c

/*
  PIM for Quagga
  Copyright (C) 2008  Everton da Silva Marques

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING; if not, write to the
  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  MA 02110-1301 USA
*/

#include <zebra.h>

#include "if.h"

#include "log.h"
#include "prefix.h"
#include "memory.h"

#include "pimd.h"
#include "pim_rpf.h"
#include "pim_pim.h"
#include "pim_str.h"
#include "pim_iface.h"
#include "pim_zlookup.h"
#include "pim_ifchannel.h"
#include "pim_time.h"

static long long last_route_change_time = -1;
long long nexthop_lookups_avoided = 0;

static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up);

void
pim_rpf_set_refresh_time (void)
{
  last_route_change_time = pim_time_monotonic_usec();
  if (PIM_DEBUG_TRACE)
    zlog_debug ("%s: New last route change time: %lld",
		__PRETTY_FUNCTION__, last_route_change_time);
}

int pim_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, int neighbor_needed)
{
  struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM];
  int num_ifindex;
  struct interface *ifp = NULL;
  ifindex_t first_ifindex = 0;
  int found = 0;
  int i = 0;

  if ((nexthop->last_lookup.s_addr == addr.s_addr) &&
      (nexthop->last_lookup_time > last_route_change_time))
    {
      if (PIM_DEBUG_TRACE)
	{
	  char addr_str[INET_ADDRSTRLEN];
	  pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	  zlog_debug ("%s: Using last lookup for %s at %lld, %lld",
		      __PRETTY_FUNCTION__,
		      addr_str,
		      nexthop->last_lookup_time,
		      last_route_change_time);
	}
      nexthop_lookups_avoided++;
      return 0;
    }
  else
    {
      if (PIM_DEBUG_TRACE)
	{
	  char addr_str[INET_ADDRSTRLEN];
	  pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	  zlog_debug ("%s: Looking up: %s, last lookup time: %lld, %lld",
		      __PRETTY_FUNCTION__,
		      addr_str,
		      nexthop->last_lookup_time,
		      last_route_change_time);
	}
    }

  memset (nexthop_tab, 0, sizeof (struct pim_zlookup_nexthop) * MULTIPATH_NUM);
  num_ifindex = zclient_lookup_nexthop(nexthop_tab,
				       MULTIPATH_NUM,
				       addr, PIM_NEXTHOP_LOOKUP_MAX);
  if (num_ifindex < 1) {
    char addr_str[INET_ADDRSTRLEN];
    pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
    zlog_warn("%s %s: could not find nexthop ifindex for address %s",
	      __FILE__, __PRETTY_FUNCTION__,
	      addr_str);
    return -1;
  }

  while (!found && (i < num_ifindex))
    {
      first_ifindex = nexthop_tab[i].ifindex;

      ifp = if_lookup_by_index(first_ifindex);
      if (!ifp)
        {
          if (PIM_DEBUG_ZEBRA)
            {
              char addr_str[INET_ADDRSTRLEN];
              pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
              zlog_debug("%s %s: could not find interface for ifindex %d (address %s)",
                         __FILE__, __PRETTY_FUNCTION__,
                         first_ifindex, addr_str);
            }
	  i++;
	  continue;
        }

      if (!ifp->info)
        {
	  if (PIM_DEBUG_ZEBRA)
	    {
	      char addr_str[INET_ADDRSTRLEN];
	      pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	      zlog_debug("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
			 __PRETTY_FUNCTION__,
			 ifp->name, first_ifindex, addr_str);
	    }
	  i++;
        }
      else if (neighbor_needed && !pim_if_connected_to_source (ifp, addr))
        {
          struct pim_neighbor *nbr;

          nbr = pim_neighbor_find (ifp, nexthop_tab[i].nexthop_addr.u.prefix4);
          if (PIM_DEBUG_PIM_TRACE_DETAIL)
            zlog_debug ("ifp name: %s, pim nbr: %p", ifp->name, nbr);
          if (!nbr && !if_is_loopback (ifp))
            i++;
          else
            found = 1;
        }
      else
        found = 1;
    }

  if (found)
    {
      if (PIM_DEBUG_ZEBRA) {
        char nexthop_str[PREFIX_STRLEN];
        char addr_str[INET_ADDRSTRLEN];
        pim_addr_dump("<nexthop?>", &nexthop_tab[i].nexthop_addr, nexthop_str, sizeof(nexthop_str));
        pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
        zlog_debug("%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d",
	           __FILE__, __PRETTY_FUNCTION__,
	           nexthop_str, addr_str,
	           ifp->name, first_ifindex,
	           nexthop_tab[i].route_metric,
	           nexthop_tab[i].protocol_distance);
      }
      /* update nextop data */
      nexthop->interface                = ifp;
      nexthop->mrib_nexthop_addr        = nexthop_tab[i].nexthop_addr;
      nexthop->mrib_metric_preference   = nexthop_tab[i].protocol_distance;
      nexthop->mrib_route_metric        = nexthop_tab[i].route_metric;
      nexthop->last_lookup              = addr;
      nexthop->last_lookup_time         = pim_time_monotonic_usec();
      return 0;
    }
  else
    return -1;
}

static int nexthop_mismatch(const struct pim_nexthop *nh1,
			    const struct pim_nexthop *nh2)
{
  return (nh1->interface != nh2->interface)                          ||
    (nh1->mrib_nexthop_addr.u.prefix4.s_addr != nh2->mrib_nexthop_addr.u.prefix4.s_addr) ||
    (nh1->mrib_metric_preference != nh2->mrib_metric_preference)     ||
    (nh1->mrib_route_metric != nh2->mrib_route_metric);
}

enum pim_rpf_result pim_rpf_update(struct pim_upstream *up, struct in_addr *old_rpf_addr)
{
  struct prefix       save_rpf_addr;
  struct pim_nexthop  save_nexthop;
  struct pim_rpf     *rpf = &up->rpf;

  save_nexthop  = rpf->source_nexthop; /* detect change in pim_nexthop */
  save_rpf_addr = rpf->rpf_addr;       /* detect change in RPF'(S,G) */

  if (pim_nexthop_lookup(&rpf->source_nexthop,
                         up->upstream_addr,
                         !PIM_UPSTREAM_FLAG_TEST_FHR (up->flags) && 
                         !PIM_UPSTREAM_FLAG_TEST_SRC_IGMP (up->flags))) {
    return PIM_RPF_FAILURE;
  }

  rpf->rpf_addr.family = AF_INET;
  rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up);
  if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) {
    /* RPF'(S,G) not found */
    zlog_debug("%s %s: RPF'%s not found: won't send join upstream",
	       __FILE__, __PRETTY_FUNCTION__,
	       up->sg_str);
    /* warning only */
  }

  /* detect change in pim_nexthop */
  if (nexthop_mismatch(&rpf->source_nexthop, &save_nexthop)) {

    if (PIM_DEBUG_ZEBRA) {
      char nhaddr_str[PREFIX_STRLEN];
      pim_addr_dump("<addr?>", &rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str));
      zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
		 __FILE__, __PRETTY_FUNCTION__,
		 up->sg_str,
		 rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>",
		 nhaddr_str,
		 rpf->source_nexthop.mrib_metric_preference,
		 rpf->source_nexthop.mrib_route_metric);
    }

    pim_upstream_update_join_desired(up);
    pim_upstream_update_could_assert(up);
    pim_upstream_update_my_assert_metric(up);
  }

  /* detect change in RPF_interface(S) */
  if (save_nexthop.interface != rpf->source_nexthop.interface) {

    if (PIM_DEBUG_ZEBRA) {
      zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
		 __FILE__, __PRETTY_FUNCTION__,
		 up->sg_str,
		 save_nexthop.interface ? save_nexthop.interface->name : "<oldif?>",
		 rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
      /* warning only */
    }

    pim_upstream_rpf_interface_changed(up, save_nexthop.interface);
  }

  /* detect change in RPF'(S,G) */
  if (save_rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr) {

    /* return old rpf to caller ? */
    if (old_rpf_addr)
      *old_rpf_addr = save_rpf_addr.u.prefix4;

    return PIM_RPF_CHANGED;
  }

  return PIM_RPF_OK;
}

/*
  RFC 4601: 4.1.6.  State Summarization Macros

     neighbor RPF'(S,G) {
         if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
              return AssertWinner(S, G, RPF_interface(S) )
         } else {
              return NBR( RPF_interface(S), MRIB.next_hop( S ) )
         }
     }

  RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
  packets should be coming and to which joins should be sent on the RP
  tree and SPT, respectively.
*/
static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up)
{
  struct pim_ifchannel *rpf_ch;
  struct pim_neighbor *neigh;
  struct in_addr rpf_addr;

  if (!up->rpf.source_nexthop.interface) {
    zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
	      __PRETTY_FUNCTION__,
	      up->sg_str);

    rpf_addr.s_addr = PIM_NET_INADDR_ANY;
    return rpf_addr;
  }

  rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface,
			      &up->sg);
  if (rpf_ch) {
    if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
      return rpf_ch->ifassert_winner;
    }
  }

  /* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */

  neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface,
			       up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4);
  if (neigh)
    rpf_addr = neigh->source_addr;
  else
    rpf_addr.s_addr = PIM_NET_INADDR_ANY;

  return rpf_addr;
}

int
pim_rpf_addr_is_inaddr_none (struct pim_rpf *rpf)
{
  switch (rpf->rpf_addr.family)
    {
    case AF_INET:
      return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE;
      break;
    case AF_INET6:
      zlog_warn ("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__);
      return 1;
      break;
    default:
      return 0;
      break;
    }

  return 0;
}

int
pim_rpf_addr_is_inaddr_any (struct pim_rpf *rpf)
{
  switch (rpf->rpf_addr.family)
    {
    case AF_INET:
      return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY;
      break;
    case AF_INET6:
      zlog_warn ("%s: v6 Unimplmented", __PRETTY_FUNCTION__);
      return 1;
      break;
    default:
      return 0;
      break;
    }

  return 0;
}

int
pim_rpf_is_same (struct pim_rpf *rpf1, struct pim_rpf *rpf2)
{
  if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface)
    return 1;

  return 0;
}
Commit	Line	Data
12e41d03 DL	1	/*
	2	PIM for Quagga
	3	Copyright (C) 2008 Everton da Silva Marques
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful, but
	11	WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; see the file COPYING; if not, write to the
	17	Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
	18	MA 02110-1301 USA
12e41d03 DL	19	*/
	20
	21	#include <zebra.h>
	22
744d91b3 DS	23	#include "if.h"
744d91b3 DS	24
12e41d03 DL	25	#include "log.h"
	26	#include "prefix.h"
	27	#include "memory.h"
	28
	29	#include "pimd.h"
	30	#include "pim_rpf.h"
	31	#include "pim_pim.h"
	32	#include "pim_str.h"
	33	#include "pim_iface.h"
	34	#include "pim_zlookup.h"
	35	#include "pim_ifchannel.h"
e71bf8f7 DS	36	#include "pim_time.h"
	37
	38	static long long last_route_change_time = -1;
	39	long long nexthop_lookups_avoided = 0;
12e41d03 DL	40
	41	static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up);
	42
e71bf8f7 DS	43	void
	44	pim_rpf_set_refresh_time (void)
	45	{
	46	last_route_change_time = pim_time_monotonic_usec();
	47	if (PIM_DEBUG_TRACE)
	48	zlog_debug ("%s: New last route change time: %lld",
	49	__PRETTY_FUNCTION__, last_route_change_time);
	50	}
	51
63b8f7a3	52	int pim_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, int neighbor_needed)
12e41d03	53	{
7b2c4d16	54	struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM];
12e41d03	55	int num_ifindex;
7a6e6567 DS	56	struct interface *ifp = NULL;
7a6e6567 DS	57	ifindex_t first_ifindex = 0;
63b8f7a3 DS	58	int found = 0;
63b8f7a3 DS	59	int i = 0;
12e41d03	60
e71bf8f7 DS	61	if ((nexthop->last_lookup.s_addr == addr.s_addr) &&
	62	(nexthop->last_lookup_time > last_route_change_time))
	63	{
	64	if (PIM_DEBUG_TRACE)
	65	{
	66	char addr_str[INET_ADDRSTRLEN];
	67	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	68	zlog_debug ("%s: Using last lookup for %s at %lld, %lld",
	69	__PRETTY_FUNCTION__,
	70	addr_str,
	71	nexthop->last_lookup_time,
	72	last_route_change_time);
	73	}
	74	nexthop_lookups_avoided++;
	75	return 0;
	76	}
	77	else
	78	{
	79	if (PIM_DEBUG_TRACE)
	80	{
	81	char addr_str[INET_ADDRSTRLEN];
	82	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	83	zlog_debug ("%s: Looking up: %s, last lookup time: %lld, %lld",
	84	__PRETTY_FUNCTION__,
	85	addr_str,
	86	nexthop->last_lookup_time,
	87	last_route_change_time);
	88	}
	89	}
	90
7b2c4d16	91	memset (nexthop_tab, 0, sizeof (struct pim_zlookup_nexthop) * MULTIPATH_NUM);
f24405b1	92	num_ifindex = zclient_lookup_nexthop(nexthop_tab,
7b2c4d16	93	MULTIPATH_NUM,
f24405b1 DS	94	addr, PIM_NEXTHOP_LOOKUP_MAX);
f24405b1 DS	95	if (num_ifindex < 1) {
eaa54bdb	96	char addr_str[INET_ADDRSTRLEN];
f24405b1 DS	97	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	98	zlog_warn("%s %s: could not find nexthop ifindex for address %s",
	99	__FILE__, __PRETTY_FUNCTION__,
	100	addr_str);
	101	return -1;
	102	}
	103
518e5727	104	while (!found && (i < num_ifindex))
63b8f7a3 DS	105	{
	106	first_ifindex = nexthop_tab[i].ifindex;
	107
	108	ifp = if_lookup_by_index(first_ifindex);
	109	if (!ifp)
	110	{
	111	if (PIM_DEBUG_ZEBRA)
	112	{
eaa54bdb	113	char addr_str[INET_ADDRSTRLEN];
63b8f7a3 DS	114	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	115	zlog_debug("%s %s: could not find interface for ifindex %d (address %s)",
	116	__FILE__, __PRETTY_FUNCTION__,
	117	first_ifindex, addr_str);
	118	}
28185336 DS	119	i++;
28185336 DS	120	continue;
63b8f7a3 DS	121	}
63b8f7a3 DS	122
518e5727	123	if (!ifp->info)
63b8f7a3	124	{
518e5727 DS	125	if (PIM_DEBUG_ZEBRA)
	126	{
	127	char addr_str[INET_ADDRSTRLEN];
	128	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	129	zlog_debug("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
	130	__PRETTY_FUNCTION__,
	131	ifp->name, first_ifindex, addr_str);
	132	}
	133	i++;
63b8f7a3	134	}
518e5727	135	else if (neighbor_needed && !pim_if_connected_to_source (ifp, addr))
63b8f7a3 DS	136	{
	137	struct pim_neighbor *nbr;
	138
	139	nbr = pim_neighbor_find (ifp, nexthop_tab[i].nexthop_addr.u.prefix4);
802b226c	140	if (PIM_DEBUG_PIM_TRACE_DETAIL)
63b8f7a3 DS	141	zlog_debug ("ifp name: %s, pim nbr: %p", ifp->name, nbr);
	142	if (!nbr && !if_is_loopback (ifp))
	143	i++;
	144	else
	145	found = 1;
	146	}
	147	else
	148	found = 1;
	149	}
	150
	151	if (found)
	152	{
	153	if (PIM_DEBUG_ZEBRA) {
eaa54bdb DW	154	char nexthop_str[PREFIX_STRLEN];
eaa54bdb DW	155	char addr_str[INET_ADDRSTRLEN];
58c51da2	156	pim_addr_dump("<nexthop?>", &nexthop_tab[i].nexthop_addr, nexthop_str, sizeof(nexthop_str));
63b8f7a3 DS	157	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	158	zlog_debug("%s %s: found nexthop %s for address %s: interface %s ifindex=%d metric=%d pref=%d",
	159	__FILE__, __PRETTY_FUNCTION__,
	160	nexthop_str, addr_str,
	161	ifp->name, first_ifindex,
58c51da2	162	nexthop_tab[i].route_metric,
58c51da2	163	nexthop_tab[i].protocol_distance);
63b8f7a3 DS	164	}
	165	/* update nextop data */
	166	nexthop->interface = ifp;
58c51da2	167	nexthop->mrib_nexthop_addr = nexthop_tab[i].nexthop_addr;
	168	nexthop->mrib_metric_preference = nexthop_tab[i].protocol_distance;
	169	nexthop->mrib_route_metric = nexthop_tab[i].route_metric;
e71bf8f7 DS	170	nexthop->last_lookup = addr;
e71bf8f7 DS	171	nexthop->last_lookup_time = pim_time_monotonic_usec();
63b8f7a3 DS	172	return 0;
	173	}
	174	else
7f748d95	175	return -1;
12e41d03 DL	176	}
	177
	178	static int nexthop_mismatch(const struct pim_nexthop *nh1,
	179	const struct pim_nexthop *nh2)
	180	{
63c59d0c DS	181	return (nh1->interface != nh2->interface) \|\|
	182	(nh1->mrib_nexthop_addr.u.prefix4.s_addr != nh2->mrib_nexthop_addr.u.prefix4.s_addr) \|\|
	183	(nh1->mrib_metric_preference != nh2->mrib_metric_preference) \|\|
12e41d03 DL	184	(nh1->mrib_route_metric != nh2->mrib_route_metric);
	185	}
	186
f24405b1	187	enum pim_rpf_result pim_rpf_update(struct pim_upstream up, struct in_addr old_rpf_addr)
12e41d03	188	{
63c59d0c	189	struct prefix save_rpf_addr;
12e41d03 DL	190	struct pim_nexthop save_nexthop;
	191	struct pim_rpf *rpf = &up->rpf;
	192
	193	save_nexthop = rpf->source_nexthop; /* detect change in pim_nexthop */
	194	save_rpf_addr = rpf->rpf_addr; /* detect change in RPF'(S,G) */
	195
63b8f7a3	196	if (pim_nexthop_lookup(&rpf->source_nexthop,
4a40c37a DS	197	up->upstream_addr,
	198	!PIM_UPSTREAM_FLAG_TEST_FHR (up->flags) &&
	199	!PIM_UPSTREAM_FLAG_TEST_SRC_IGMP (up->flags))) {
12e41d03 DL	200	return PIM_RPF_FAILURE;
	201	}
	202
63c59d0c DS	203	rpf->rpf_addr.family = AF_INET;
	204	rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up);
	205	if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) {
12e41d03	206	/* RPF'(S,G) not found */
05e451f8	207	zlog_debug("%s %s: RPF'%s not found: won't send join upstream",
7adf0260	208	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	209	up->sg_str);
12e41d03 DL	210	/* warning only */
	211	}
	212
	213	/* detect change in pim_nexthop */
	214	if (nexthop_mismatch(&rpf->source_nexthop, &save_nexthop)) {
	215
ff67a923	216	if (PIM_DEBUG_ZEBRA) {
eaa54bdb	217	char nhaddr_str[PREFIX_STRLEN];
63c59d0c	218	pim_addr_dump("<addr?>", &rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str));
05e451f8	219	zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
12e41d03	220	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	221	up->sg_str,
12e41d03 DL	222	rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>",
	223	nhaddr_str,
	224	rpf->source_nexthop.mrib_metric_preference,
	225	rpf->source_nexthop.mrib_route_metric);
12e41d03 DL	226	}
	227
	228	pim_upstream_update_join_desired(up);
	229	pim_upstream_update_could_assert(up);
	230	pim_upstream_update_my_assert_metric(up);
	231	}
	232
	233	/* detect change in RPF_interface(S) */
	234	if (save_nexthop.interface != rpf->source_nexthop.interface) {
	235
ff67a923	236	if (PIM_DEBUG_ZEBRA) {
05e451f8	237	zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
12e41d03	238	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	239	up->sg_str,
12e41d03 DL	240	save_nexthop.interface ? save_nexthop.interface->name : "<oldif?>",
	241	rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
	242	/* warning only */
	243	}
	244
	245	pim_upstream_rpf_interface_changed(up, save_nexthop.interface);
	246	}
	247
	248	/* detect change in RPF'(S,G) */
63c59d0c	249	if (save_rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr) {
12e41d03 DL	250
	251	/* return old rpf to caller ? */
	252	if (old_rpf_addr)
63c59d0c	253	*old_rpf_addr = save_rpf_addr.u.prefix4;
12e41d03 DL	254
	255	return PIM_RPF_CHANGED;
	256	}
	257
	258	return PIM_RPF_OK;
	259	}
	260
	261	/*
	262	RFC 4601: 4.1.6. State Summarization Macros
	263
	264	neighbor RPF'(S,G) {
	265	if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
	266	return AssertWinner(S, G, RPF_interface(S) )
	267	} else {
	268	return NBR( RPF_interface(S), MRIB.next_hop( S ) )
	269	}
	270	}
	271
	272	RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
	273	packets should be coming and to which joins should be sent on the RP
	274	tree and SPT, respectively.
	275	*/
	276	static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up)
	277	{
	278	struct pim_ifchannel *rpf_ch;
	279	struct pim_neighbor *neigh;
	280	struct in_addr rpf_addr;
	281
	282	if (!up->rpf.source_nexthop.interface) {
05e451f8	283	zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
12e41d03	284	__PRETTY_FUNCTION__,
8bfb8b67	285	up->sg_str);
12e41d03 DL	286
	287	rpf_addr.s_addr = PIM_NET_INADDR_ANY;
	288	return rpf_addr;
	289	}
	290
	291	rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface,
5074a423	292	&up->sg);
12e41d03 DL	293	if (rpf_ch) {
	294	if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
	295	return rpf_ch->ifassert_winner;
	296	}
	297	}
	298
	299	/* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
	300
	301	neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface,
63c59d0c	302	up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4);
12e41d03 DL	303	if (neigh)
	304	rpf_addr = neigh->source_addr;
	305	else
	306	rpf_addr.s_addr = PIM_NET_INADDR_ANY;
	307
	308	return rpf_addr;
	309	}
63c59d0c DS	310
	311	int
	312	pim_rpf_addr_is_inaddr_none (struct pim_rpf *rpf)
	313	{
	314	switch (rpf->rpf_addr.family)
	315	{
fa8da98c	316	case AF_INET:
63c59d0c DS	317	return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE;
63c59d0c DS	318	break;
fa8da98c	319	case AF_INET6:
63c59d0c DS	320	zlog_warn ("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__);
	321	return 1;
	322	break;
	323	default:
	324	return 0;
	325	break;
	326	}
	327
	328	return 0;
	329	}
	330
	331	int
	332	pim_rpf_addr_is_inaddr_any (struct pim_rpf *rpf)
	333	{
	334	switch (rpf->rpf_addr.family)
	335	{
fa8da98c	336	case AF_INET:
63c59d0c DS	337	return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY;
63c59d0c DS	338	break;
fa8da98c	339	case AF_INET6:
63c59d0c DS	340	zlog_warn ("%s: v6 Unimplmented", __PRETTY_FUNCTION__);
	341	return 1;
	342	break;
	343	default:
	344	return 0;
	345	break;
	346	}
	347
	348	return 0;
	349	}
66cc32fa DS	350
	351	int
	352	pim_rpf_is_same (struct pim_rpf rpf1, struct pim_rpf rpf2)
	353	{
	354	if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface)
	355	return 1;
	356
	357	return 0;
	358	}