[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"
#include "pim_nht.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];
  struct pim_neighbor *nbr = NULL;
  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, VRF_DEFAULT);
      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))
        {
          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();
      nexthop->nbr                      = nbr;
      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 pim_rpf *old, uint8_t is_new)
{
  struct pim_rpf     *rpf = &up->rpf;
  struct pim_rpf     saved;
  struct prefix     nht_p;

  saved.source_nexthop = rpf->source_nexthop;
  saved.rpf_addr = rpf->rpf_addr;

  if (is_new)
    {
      if (PIM_DEBUG_ZEBRA)
        {
          char source_str[INET_ADDRSTRLEN];
          pim_inet4_dump("<source?>", up->upstream_addr, source_str, sizeof(source_str));
          zlog_debug ("%s: NHT Register upstream %s addr %s with Zebra.",
                __PRETTY_FUNCTION__, up->sg_str, source_str);
        }
      /* Register addr with Zebra NHT */
      nht_p.family = AF_INET;
      nht_p.prefixlen = IPV4_MAX_BITLEN;
      nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr;
      pim_find_or_track_nexthop (&nht_p, up, NULL);
    }

  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, &saved.source_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 (saved.source_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,
		 saved.source_nexthop.interface ? saved.source_nexthop.interface->name : "<oldif?>",
		 rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
      /* warning only */
    }

    pim_upstream_rpf_interface_changed(up, saved.source_nexthop.interface);
  }

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

    /* return old rpf to caller ? */
    if (old)
      {
        old->source_nexthop = saved.source_nexthop;
        old->rpf_addr = saved.rpf_addr;
      }
    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	36	#include "pim_time.h"
1bc98276	37	#include "pim_nht.h"
e71bf8f7 DS	38
	39	static long long last_route_change_time = -1;
	40	long long nexthop_lookups_avoided = 0;
12e41d03	41
1bc98276	42	static struct in_addr pim_rpf_find_rpf_addr (struct pim_upstream *up);
12e41d03	43
e71bf8f7 DS	44	void
	45	pim_rpf_set_refresh_time (void)
	46	{
	47	last_route_change_time = pim_time_monotonic_usec();
	48	if (PIM_DEBUG_TRACE)
	49	zlog_debug ("%s: New last route change time: %lld",
	50	__PRETTY_FUNCTION__, last_route_change_time);
	51	}
	52
63b8f7a3	53	int pim_nexthop_lookup(struct pim_nexthop *nexthop, struct in_addr addr, int neighbor_needed)
12e41d03	54	{
7b2c4d16	55	struct pim_zlookup_nexthop nexthop_tab[MULTIPATH_NUM];
982bff89	56	struct pim_neighbor *nbr = NULL;
12e41d03	57	int num_ifindex;
7a6e6567 DS	58	struct interface *ifp = NULL;
7a6e6567 DS	59	ifindex_t first_ifindex = 0;
63b8f7a3 DS	60	int found = 0;
63b8f7a3 DS	61	int i = 0;
12e41d03	62
e71bf8f7 DS	63	if ((nexthop->last_lookup.s_addr == addr.s_addr) &&
	64	(nexthop->last_lookup_time > last_route_change_time))
	65	{
	66	if (PIM_DEBUG_TRACE)
	67	{
	68	char addr_str[INET_ADDRSTRLEN];
	69	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	70	zlog_debug ("%s: Using last lookup for %s at %lld, %lld",
	71	__PRETTY_FUNCTION__,
	72	addr_str,
	73	nexthop->last_lookup_time,
	74	last_route_change_time);
	75	}
	76	nexthop_lookups_avoided++;
	77	return 0;
	78	}
	79	else
	80	{
	81	if (PIM_DEBUG_TRACE)
	82	{
	83	char addr_str[INET_ADDRSTRLEN];
	84	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	85	zlog_debug ("%s: Looking up: %s, last lookup time: %lld, %lld",
	86	__PRETTY_FUNCTION__,
	87	addr_str,
	88	nexthop->last_lookup_time,
	89	last_route_change_time);
	90	}
	91	}
	92
7b2c4d16	93	memset (nexthop_tab, 0, sizeof (struct pim_zlookup_nexthop) * MULTIPATH_NUM);
f24405b1	94	num_ifindex = zclient_lookup_nexthop(nexthop_tab,
7b2c4d16	95	MULTIPATH_NUM,
f24405b1 DS	96	addr, PIM_NEXTHOP_LOOKUP_MAX);
f24405b1 DS	97	if (num_ifindex < 1) {
eaa54bdb	98	char addr_str[INET_ADDRSTRLEN];
f24405b1 DS	99	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	100	zlog_warn("%s %s: could not find nexthop ifindex for address %s",
	101	__FILE__, __PRETTY_FUNCTION__,
	102	addr_str);
	103	return -1;
	104	}
	105
518e5727	106	while (!found && (i < num_ifindex))
63b8f7a3 DS	107	{
	108	first_ifindex = nexthop_tab[i].ifindex;
	109
7e2b7603	110	ifp = if_lookup_by_index(first_ifindex, VRF_DEFAULT);
63b8f7a3 DS	111	if (!ifp)
	112	{
	113	if (PIM_DEBUG_ZEBRA)
	114	{
eaa54bdb	115	char addr_str[INET_ADDRSTRLEN];
63b8f7a3 DS	116	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	117	zlog_debug("%s %s: could not find interface for ifindex %d (address %s)",
	118	__FILE__, __PRETTY_FUNCTION__,
	119	first_ifindex, addr_str);
	120	}
28185336 DS	121	i++;
28185336 DS	122	continue;
63b8f7a3 DS	123	}
63b8f7a3 DS	124
518e5727	125	if (!ifp->info)
63b8f7a3	126	{
518e5727 DS	127	if (PIM_DEBUG_ZEBRA)
	128	{
	129	char addr_str[INET_ADDRSTRLEN];
	130	pim_inet4_dump("<addr?>", addr, addr_str, sizeof(addr_str));
	131	zlog_debug("%s: multicast not enabled on input interface %s (ifindex=%d, RPF for source %s)",
	132	__PRETTY_FUNCTION__,
	133	ifp->name, first_ifindex, addr_str);
	134	}
	135	i++;
63b8f7a3	136	}
518e5727	137	else if (neighbor_needed && !pim_if_connected_to_source (ifp, addr))
63b8f7a3	138	{
63b8f7a3	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();
982bff89	172	nexthop->nbr = nbr;
63b8f7a3 DS	173	return 0;
	174	}
	175	else
7f748d95	176	return -1;
12e41d03 DL	177	}
	178
	179	static int nexthop_mismatch(const struct pim_nexthop *nh1,
	180	const struct pim_nexthop *nh2)
	181	{
63c59d0c DS	182	return (nh1->interface != nh2->interface) \|\|
	183	(nh1->mrib_nexthop_addr.u.prefix4.s_addr != nh2->mrib_nexthop_addr.u.prefix4.s_addr) \|\|
	184	(nh1->mrib_metric_preference != nh2->mrib_metric_preference) \|\|
12e41d03 DL	185	(nh1->mrib_route_metric != nh2->mrib_route_metric);
	186	}
	187
1bc98276	188	enum pim_rpf_result pim_rpf_update(struct pim_upstream up, struct pim_rpf old, uint8_t is_new)
12e41d03	189	{
12e41d03	190	struct pim_rpf *rpf = &up->rpf;
42a0111b	191	struct pim_rpf saved;
1bc98276	192	struct prefix nht_p;
12e41d03	193
42a0111b DS	194	saved.source_nexthop = rpf->source_nexthop;
42a0111b DS	195	saved.rpf_addr = rpf->rpf_addr;
12e41d03	196
1bc98276 CS	197	if (is_new)
	198	{
	199	if (PIM_DEBUG_ZEBRA)
	200	{
	201	char source_str[INET_ADDRSTRLEN];
	202	pim_inet4_dump("<source?>", up->upstream_addr, source_str, sizeof(source_str));
	203	zlog_debug ("%s: NHT Register upstream %s addr %s with Zebra.",
	204	__PRETTY_FUNCTION__, up->sg_str, source_str);
	205	}
	206	/* Register addr with Zebra NHT */
	207	nht_p.family = AF_INET;
	208	nht_p.prefixlen = IPV4_MAX_BITLEN;
	209	nht_p.u.prefix4.s_addr = up->upstream_addr.s_addr;
	210	pim_find_or_track_nexthop (&nht_p, up, NULL);
	211	}
	212
63b8f7a3	213	if (pim_nexthop_lookup(&rpf->source_nexthop,
4a40c37a DS	214	up->upstream_addr,
	215	!PIM_UPSTREAM_FLAG_TEST_FHR (up->flags) &&
	216	!PIM_UPSTREAM_FLAG_TEST_SRC_IGMP (up->flags))) {
12e41d03 DL	217	return PIM_RPF_FAILURE;
	218	}
	219
63c59d0c DS	220	rpf->rpf_addr.family = AF_INET;
	221	rpf->rpf_addr.u.prefix4 = pim_rpf_find_rpf_addr(up);
	222	if (pim_rpf_addr_is_inaddr_any(rpf) && PIM_DEBUG_ZEBRA) {
12e41d03	223	/* RPF'(S,G) not found */
05e451f8	224	zlog_debug("%s %s: RPF'%s not found: won't send join upstream",
7adf0260	225	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	226	up->sg_str);
12e41d03 DL	227	/* warning only */
	228	}
	229
	230	/* detect change in pim_nexthop */
42a0111b	231	if (nexthop_mismatch(&rpf->source_nexthop, &saved.source_nexthop)) {
12e41d03	232
ff67a923	233	if (PIM_DEBUG_ZEBRA) {
eaa54bdb	234	char nhaddr_str[PREFIX_STRLEN];
63c59d0c	235	pim_addr_dump("<addr?>", &rpf->source_nexthop.mrib_nexthop_addr, nhaddr_str, sizeof(nhaddr_str));
05e451f8	236	zlog_debug("%s %s: (S,G)=%s source nexthop now is: interface=%s address=%s pref=%d metric=%d",
12e41d03	237	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	238	up->sg_str,
12e41d03 DL	239	rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<ifname?>",
	240	nhaddr_str,
	241	rpf->source_nexthop.mrib_metric_preference,
	242	rpf->source_nexthop.mrib_route_metric);
12e41d03 DL	243	}
	244
	245	pim_upstream_update_join_desired(up);
	246	pim_upstream_update_could_assert(up);
	247	pim_upstream_update_my_assert_metric(up);
	248	}
	249
	250	/* detect change in RPF_interface(S) */
42a0111b	251	if (saved.source_nexthop.interface != rpf->source_nexthop.interface) {
12e41d03	252
ff67a923	253	if (PIM_DEBUG_ZEBRA) {
05e451f8	254	zlog_debug("%s %s: (S,G)=%s RPF_interface(S) changed from %s to %s",
12e41d03	255	__FILE__, __PRETTY_FUNCTION__,
8bfb8b67	256	up->sg_str,
42a0111b	257	saved.source_nexthop.interface ? saved.source_nexthop.interface->name : "<oldif?>",
12e41d03 DL	258	rpf->source_nexthop.interface ? rpf->source_nexthop.interface->name : "<newif?>");
	259	/* warning only */
	260	}
	261
42a0111b	262	pim_upstream_rpf_interface_changed(up, saved.source_nexthop.interface);
12e41d03 DL	263	}
	264
	265	/* detect change in RPF'(S,G) */
ce2b6ce0 DS	266	if (saved.rpf_addr.u.prefix4.s_addr != rpf->rpf_addr.u.prefix4.s_addr \|\|
	267	saved.source_nexthop.interface != rpf->source_nexthop.interface)
	268	{
12e41d03 DL	269
12e41d03 DL	270	/* return old rpf to caller ? */
42a0111b DS	271	if (old)
	272	{
	273	old->source_nexthop = saved.source_nexthop;
	274	old->rpf_addr = saved.rpf_addr;
	275	}
12e41d03 DL	276	return PIM_RPF_CHANGED;
	277	}
	278
	279	return PIM_RPF_OK;
	280	}
	281
	282	/*
	283	RFC 4601: 4.1.6. State Summarization Macros
	284
	285	neighbor RPF'(S,G) {
	286	if ( I_Am_Assert_Loser(S, G, RPF_interface(S) )) {
	287	return AssertWinner(S, G, RPF_interface(S) )
	288	} else {
	289	return NBR( RPF_interface(S), MRIB.next_hop( S ) )
	290	}
	291	}
	292
	293	RPF'(*,G) and RPF'(S,G) indicate the neighbor from which data
	294	packets should be coming and to which joins should be sent on the RP
	295	tree and SPT, respectively.
	296	*/
	297	static struct in_addr pim_rpf_find_rpf_addr(struct pim_upstream *up)
	298	{
	299	struct pim_ifchannel *rpf_ch;
	300	struct pim_neighbor *neigh;
	301	struct in_addr rpf_addr;
	302
	303	if (!up->rpf.source_nexthop.interface) {
05e451f8	304	zlog_warn("%s: missing RPF interface for upstream (S,G)=%s",
12e41d03	305	__PRETTY_FUNCTION__,
8bfb8b67	306	up->sg_str);
12e41d03 DL	307
	308	rpf_addr.s_addr = PIM_NET_INADDR_ANY;
	309	return rpf_addr;
	310	}
	311
	312	rpf_ch = pim_ifchannel_find(up->rpf.source_nexthop.interface,
5074a423	313	&up->sg);
12e41d03 DL	314	if (rpf_ch) {
	315	if (rpf_ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) {
	316	return rpf_ch->ifassert_winner;
	317	}
	318	}
	319
	320	/* return NBR( RPF_interface(S), MRIB.next_hop( S ) ) */
	321
	322	neigh = pim_if_find_neighbor(up->rpf.source_nexthop.interface,
63c59d0c	323	up->rpf.source_nexthop.mrib_nexthop_addr.u.prefix4);
12e41d03 DL	324	if (neigh)
	325	rpf_addr = neigh->source_addr;
	326	else
	327	rpf_addr.s_addr = PIM_NET_INADDR_ANY;
	328
	329	return rpf_addr;
	330	}
63c59d0c DS	331
	332	int
	333	pim_rpf_addr_is_inaddr_none (struct pim_rpf *rpf)
	334	{
	335	switch (rpf->rpf_addr.family)
	336	{
fa8da98c	337	case AF_INET:
63c59d0c DS	338	return rpf->rpf_addr.u.prefix4.s_addr == INADDR_NONE;
63c59d0c DS	339	break;
fa8da98c	340	case AF_INET6:
63c59d0c DS	341	zlog_warn ("%s: v6 Unimplmeneted", __PRETTY_FUNCTION__);
	342	return 1;
	343	break;
	344	default:
	345	return 0;
	346	break;
	347	}
	348
	349	return 0;
	350	}
	351
	352	int
	353	pim_rpf_addr_is_inaddr_any (struct pim_rpf *rpf)
	354	{
	355	switch (rpf->rpf_addr.family)
	356	{
fa8da98c	357	case AF_INET:
63c59d0c DS	358	return rpf->rpf_addr.u.prefix4.s_addr == INADDR_ANY;
63c59d0c DS	359	break;
fa8da98c	360	case AF_INET6:
63c59d0c DS	361	zlog_warn ("%s: v6 Unimplmented", __PRETTY_FUNCTION__);
	362	return 1;
	363	break;
	364	default:
	365	return 0;
	366	break;
	367	}
	368
	369	return 0;
	370	}
66cc32fa DS	371
	372	int
	373	pim_rpf_is_same (struct pim_rpf rpf1, struct pim_rpf rpf2)
	374	{
	375	if (rpf1->source_nexthop.interface == rpf2->source_nexthop.interface)
	376	return 1;
	377
	378	return 0;
	379	}