[mirror_frr.git] / bgpd / bgp_nexthop.c

/* BGP nexthop scan
   Copyright (C) 2000 Kunihiro Ishiguro

This file is part of GNU Zebra.

GNU Zebra 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, or (at your option) any
later version.

GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include <zebra.h>

#include "command.h"
#include "thread.h"
#include "prefix.h"
#include "zclient.h"
#include "stream.h"
#include "network.h"
#include "log.h"
#include "memory.h"
#include "hash.h"
#include "jhash.h"
#include "nexthop.h"
#include "queue.h"

#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_nexthop.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_damp.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"	/* For ZEBRA_SERV_PATH. */


/* Route table for next-hop lookup cache. */
struct bgp_table *bgp_nexthop_cache_table[AFI_MAX];

/* Route table for connected route. */
static struct bgp_table *bgp_connected_table[AFI_MAX];

/* Route table for import-check */
struct bgp_table *bgp_import_check_table[AFI_MAX];

char *
bnc_str (struct bgp_nexthop_cache *bnc, char *buf, int size)
{
  prefix2str(&(bnc->node->p), buf, size);
  return buf;
}

void
bnc_nexthop_free (struct bgp_nexthop_cache *bnc)
{
  struct nexthop *nexthop;
  struct nexthop *next = NULL;

  for (nexthop = bnc->nexthop; nexthop; nexthop = next)
    {
      next = nexthop->next;
      XFREE (MTYPE_NEXTHOP, nexthop);
    }
}

struct bgp_nexthop_cache *
bnc_new (void)
{
  struct bgp_nexthop_cache *bnc;

  bnc = XCALLOC (MTYPE_BGP_NEXTHOP_CACHE, sizeof (struct bgp_nexthop_cache));
  LIST_INIT(&(bnc->paths));
  return bnc;
}

void
bnc_free (struct bgp_nexthop_cache *bnc)
{
  bnc_nexthop_free (bnc);
  XFREE (MTYPE_BGP_NEXTHOP_CACHE, bnc);
}

/* Reset and free all BGP nexthop cache. */
static void
bgp_nexthop_cache_reset (struct bgp_table *table)
{
  struct bgp_node *rn;
  struct bgp_nexthop_cache *bnc;

  for (rn = bgp_table_top (table); rn; rn = bgp_route_next (rn))
    if ((bnc = rn->info) != NULL)
      {
	bnc_free (bnc);
	rn->info = NULL;
	bgp_unlock_node (rn);
      }
}

/* BGP own address structure */
struct bgp_addr
{
  struct in_addr addr;
  int refcnt;
};

static struct hash *bgp_address_hash;

static void *
bgp_address_hash_alloc (void *p)
{
  const struct in_addr *val = (const struct in_addr *)p;
  struct bgp_addr *addr;

  addr = XMALLOC (MTYPE_BGP_ADDR, sizeof (struct bgp_addr));
  addr->refcnt = 0;
  addr->addr.s_addr = val->s_addr;

  return addr;
}

static unsigned int
bgp_address_hash_key_make (void *p)
{
  const struct bgp_addr *addr = p;

  return jhash_1word(addr->addr.s_addr, 0);
}

static int
bgp_address_hash_cmp (const void *p1, const void *p2)
{
  const struct bgp_addr *addr1 = p1;
  const struct bgp_addr *addr2 = p2;

  return addr1->addr.s_addr == addr2->addr.s_addr;
}

void
bgp_address_init (void)
{
  bgp_address_hash = hash_create (bgp_address_hash_key_make,
                                  bgp_address_hash_cmp);
}

static void
bgp_address_add (struct prefix *p)
{
  struct bgp_addr tmp;
  struct bgp_addr *addr;

  tmp.addr = p->u.prefix4;

  addr = hash_get (bgp_address_hash, &tmp, bgp_address_hash_alloc);
  if (!addr)
    return;

  addr->refcnt++;
}

static void
bgp_address_del (struct prefix *p)
{
  struct bgp_addr tmp;
  struct bgp_addr *addr;

  tmp.addr = p->u.prefix4;

  addr = hash_lookup (bgp_address_hash, &tmp);
  /* may have been deleted earlier by bgp_interface_down() */
  if (addr == NULL)
    return;

  addr->refcnt--;

  if (addr->refcnt == 0)
    {
      hash_release (bgp_address_hash, addr);
      XFREE (MTYPE_BGP_ADDR, addr);
    }
}


struct bgp_connected_ref
{
  unsigned int refcnt;
};

void
bgp_connected_add (struct connected *ifc)
{
  struct prefix p;
  struct prefix *addr;
  struct bgp_node *rn;
  struct bgp_connected_ref *bc;

  addr = ifc->address;

  if (addr->family == AF_INET)
    {
      PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
      apply_mask_ipv4 ((struct prefix_ipv4 *) &p);

      if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	return;

      bgp_address_add (addr);

      rn = bgp_node_get (bgp_connected_table[AFI_IP], (struct prefix *) &p);
      if (rn->info)
	{
	  bc = rn->info;
	  bc->refcnt++;
	}
      else
	{
	  bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
	  bc->refcnt = 1;
	  rn->info = bc;
	}
    }
#ifdef HAVE_IPV6
  else if (addr->family == AF_INET6)
    {
      PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
      apply_mask_ipv6 ((struct prefix_ipv6 *) &p);

      if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	return;

      if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	return;

      rn = bgp_node_get (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
      if (rn->info)
	{
	  bc = rn->info;
	  bc->refcnt++;
	}
      else
	{
	  bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
	  bc->refcnt = 1;
	  rn->info = bc;
	}
    }
#endif /* HAVE_IPV6 */
}

void
bgp_connected_delete (struct connected *ifc)
{
  struct prefix p;
  struct prefix *addr;
  struct bgp_node *rn;
  struct bgp_connected_ref *bc;

  addr = ifc->address;

  if (addr->family == AF_INET)
    {
      PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
      apply_mask_ipv4 ((struct prefix_ipv4 *) &p);

      if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	return;

      bgp_address_del (addr);

      rn = bgp_node_lookup (bgp_connected_table[AFI_IP], &p);
      if (! rn)
	return;

      bc = rn->info;
      bc->refcnt--;
      if (bc->refcnt == 0)
	{
	  XFREE (MTYPE_BGP_CONN, bc);
	  rn->info = NULL;
	}
      bgp_unlock_node (rn);
      bgp_unlock_node (rn);
    }
#ifdef HAVE_IPV6
  else if (addr->family == AF_INET6)
    {
      PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
      apply_mask_ipv6 ((struct prefix_ipv6 *) &p);

      if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	return;

      if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	return;

      rn = bgp_node_lookup (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
      if (! rn)
	return;

      bc = rn->info;
      bc->refcnt--;
      if (bc->refcnt == 0)
	{
	  XFREE (MTYPE_BGP_CONN, bc);
	  rn->info = NULL;
	}
      bgp_unlock_node (rn);
      bgp_unlock_node (rn);
    }
#endif /* HAVE_IPV6 */
}

int
bgp_nexthop_self (struct attr *attr)
{
  struct bgp_addr tmp, *addr;

  tmp.addr = attr->nexthop;

  addr = hash_lookup (bgp_address_hash, &tmp);
  if (addr)
    return 1;

  return 0;
}


int
bgp_multiaccess_check_v4 (struct in_addr nexthop, struct peer *peer)
{
  struct bgp_node *rn1;
  struct bgp_node *rn2;
  struct prefix p;
  int ret;

  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_BITLEN;
  p.u.prefix4 = nexthop;

  rn1 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
  if (!rn1)
    return 0;

  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_BITLEN;
  p.u.prefix4 = peer->su.sin.sin_addr;

  rn2 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
  if (!rn2)
    {
      bgp_unlock_node(rn1);
      return 0;
    }

  ret = (rn1 == rn2) ? 1 : 0;

  bgp_unlock_node(rn1);
  bgp_unlock_node(rn2);

  return (ret);
}

static int
show_ip_bgp_nexthop_table (struct vty *vty, int detail)
{
  struct bgp_node *rn;
  struct bgp_nexthop_cache *bnc;
  char buf[INET6_ADDRSTRLEN];
  struct nexthop *nexthop;
  time_t tbuf;

  vty_out (vty, "Current BGP nexthop cache:%s", VTY_NEWLINE);
  for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP]); rn; rn = bgp_route_next (rn))
    if ((bnc = rn->info) != NULL)
      {
	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	{
	  vty_out (vty, " %s valid [IGP metric %d], #paths %d%s",
		   inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN),
		   bnc->metric, bnc->path_count, VTY_NEWLINE);
	  if (detail)
	    for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
	      switch (nexthop->type)
		{
		case NEXTHOP_TYPE_IPV4:
		  vty_out (vty, "  gate %s%s",
			   inet_ntop (AF_INET, &nexthop->gate.ipv4, buf,
				      INET6_ADDRSTRLEN), VTY_NEWLINE);
		  break;
		case NEXTHOP_TYPE_IFINDEX:
		  vty_out (vty, "  if %s%s",
			   ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
		  break;
		case NEXTHOP_TYPE_IPV4_IFINDEX:
		  vty_out (vty, "  gate %s, if %s%s",
			   inet_ntop(AF_INET, &nexthop->gate.ipv4, buf,
				     INET6_ADDRSTRLEN),
			   ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
		  break;
		default:
		  vty_out (vty, "  invalid nexthop type %u%s",
			   nexthop->type, VTY_NEWLINE);
		}
	}
	else
          {
	    vty_out (vty, " %s invalid%s",
		     inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN), VTY_NEWLINE);

            if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED))
              vty_out (vty, "  Must be Connected%s", VTY_NEWLINE);
          }
#ifdef HAVE_CLOCK_MONOTONIC
	tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	vty_out (vty, "  Last update: %s", ctime(&tbuf));
#else
	vty_out (vty, "  Last update: %s", ctime(&bnc->uptime));
#endif /* HAVE_CLOCK_MONOTONIC */

	vty_out(vty, "%s", VTY_NEWLINE);
      }

#ifdef HAVE_IPV6
  {
    for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP6]);
         rn;
         rn = bgp_route_next (rn))
      if ((bnc = rn->info) != NULL)
	{
	  if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	  {
	    vty_out (vty, " %s valid [IGP metric %d]%s",
		     inet_ntop (AF_INET6, &rn->p.u.prefix6, buf,
				INET6_ADDRSTRLEN),
		     bnc->metric, VTY_NEWLINE);
	    if (detail)
	      for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
		switch (nexthop->type)
		  {
		  case NEXTHOP_TYPE_IPV6:
		    vty_out (vty, "  gate %s%s",
			     inet_ntop (AF_INET6, &nexthop->gate.ipv6,
					buf, INET6_ADDRSTRLEN), VTY_NEWLINE);
		    break;
		  case NEXTHOP_TYPE_IPV6_IFINDEX:
		    vty_out(vty, "  gate %s, if %s%s",
			    inet_ntop(AF_INET6, &nexthop->gate.ipv6, buf,
				      INET6_ADDRSTRLEN),
			    ifindex2ifname(nexthop->ifindex),
			    VTY_NEWLINE);
		    break;
		  case NEXTHOP_TYPE_IFINDEX:
		    vty_out (vty, "  ifidx %u%s", nexthop->ifindex,
			     VTY_NEWLINE);
		    break;
		  default:
		    vty_out (vty, "  invalid nexthop type %u%s",
			     nexthop->type, VTY_NEWLINE);
		  }
	  }
	  else
            {
	      vty_out (vty, " %s invalid%s",
		       inet_ntop (AF_INET6, &rn->p.u.prefix6, buf, INET6_ADDRSTRLEN),
		       VTY_NEWLINE);

              if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED))
                vty_out (vty, "  Must be Connected%s", VTY_NEWLINE);
            }
#ifdef HAVE_CLOCK_MONOTONIC
	  tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	  vty_out (vty, "  Last update: %s", ctime(&tbuf));
#else
	  vty_out (vty, "  Last update: %s", ctime(&bnc->uptime));
#endif /* HAVE_CLOCK_MONOTONIC */

	  vty_out(vty, "%s", VTY_NEWLINE);
	}
  }
#endif /* HAVE_IPV6 */
  return CMD_SUCCESS;
}

DEFUN (show_ip_bgp_nexthop,
       show_ip_bgp_nexthop_cmd,
       "show ip bgp nexthop",
       SHOW_STR
       IP_STR
       BGP_STR
       "BGP nexthop table\n")
{
  return show_ip_bgp_nexthop_table (vty, 0);
}

DEFUN (show_ip_bgp_nexthop_detail,
       show_ip_bgp_nexthop_detail_cmd,
       "show ip bgp nexthop detail",
       SHOW_STR
       IP_STR
       BGP_STR
       "BGP nexthop table\n")
{
  return show_ip_bgp_nexthop_table (vty, 1);
}

void
bgp_scan_init (void)
{
  bgp_nexthop_cache_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
  bgp_connected_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
  bgp_import_check_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);

#ifdef HAVE_IPV6
  bgp_nexthop_cache_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
  bgp_connected_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
  bgp_import_check_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
#endif /* HAVE_IPV6 */

}

void
bgp_scan_vty_init (void)
{
  install_element (ENABLE_NODE, &show_ip_bgp_nexthop_cmd);
  install_element (VIEW_NODE, &show_ip_bgp_nexthop_cmd);
  install_element (VIEW_NODE, &show_ip_bgp_nexthop_detail_cmd);
  install_element (ENABLE_NODE, &show_ip_bgp_nexthop_detail_cmd);
}

void
bgp_scan_finish (void)
{
  /* Only the current one needs to be reset. */
  bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP]);

  bgp_table_unlock (bgp_nexthop_cache_table[AFI_IP]);
  bgp_nexthop_cache_table[AFI_IP] = NULL;

  bgp_table_unlock (bgp_connected_table[AFI_IP]);
  bgp_connected_table[AFI_IP] = NULL;

  bgp_table_unlock (bgp_import_check_table[AFI_IP]);
  bgp_import_check_table[AFI_IP] = NULL;

#ifdef HAVE_IPV6
  /* Only the current one needs to be reset. */
  bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP6]);

  bgp_table_unlock (bgp_nexthop_cache_table[AFI_IP6]);
  bgp_nexthop_cache_table[AFI_IP6] = NULL;

  bgp_table_unlock (bgp_connected_table[AFI_IP6]);
  bgp_connected_table[AFI_IP6] = NULL;

  bgp_table_unlock (bgp_import_check_table[AFI_IP6]);
  bgp_import_check_table[AFI_IP6] = NULL;
#endif /* HAVE_IPV6 */
}
Commit	Line	Data
718e3744	1	/* BGP nexthop scan
	2	Copyright (C) 2000 Kunihiro Ishiguro
	3
	4	This file is part of GNU Zebra.
	5
	6	GNU Zebra is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU General Public License as published by the
	8	Free Software Foundation; either version 2, or (at your option) any
	9	later version.
	10
	11	GNU Zebra is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU Zebra; see the file COPYING. If not, write to the Free
	18	Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	19	02111-1307, USA. */
	20
	21	#include <zebra.h>
	22
	23	#include "command.h"
	24	#include "thread.h"
	25	#include "prefix.h"
	26	#include "zclient.h"
	27	#include "stream.h"
	28	#include "network.h"
	29	#include "log.h"
	30	#include "memory.h"
10f9bf3f JBD	31	#include "hash.h"
10f9bf3f JBD	32	#include "jhash.h"
fb018d25	33	#include "nexthop.h"
3f9c7369	34	#include "queue.h"
718e3744	35
	36	#include "bgpd/bgpd.h"
	37	#include "bgpd/bgp_table.h"
	38	#include "bgpd/bgp_route.h"
	39	#include "bgpd/bgp_attr.h"
	40	#include "bgpd/bgp_nexthop.h"
fb018d25	41	#include "bgpd/bgp_nht.h"
718e3744	42	#include "bgpd/bgp_debug.h"
	43	#include "bgpd/bgp_damp.h"
	44	#include "zebra/rib.h"
	45	#include "zebra/zserv.h" /* For ZEBRA_SERV_PATH. */
	46
fb018d25	47
718e3744	48
718e3744	49	/* Route table for next-hop lookup cache. */
fb018d25	50	struct bgp_table *bgp_nexthop_cache_table[AFI_MAX];
718e3744	51
718e3744	52	/* Route table for connected route. */
00d252cb	53	static struct bgp_table *bgp_connected_table[AFI_MAX];
718e3744	54
078430f6 DS	55	/* Route table for import-check */
078430f6 DS	56	struct bgp_table *bgp_import_check_table[AFI_MAX];
6b0655a2	57
fb018d25 DS	58	char *
	59	bnc_str (struct bgp_nexthop_cache bnc, char buf, int size)
	60	{
	61	prefix2str(&(bnc->node->p), buf, size);
	62	return buf;
	63	}
	64
fb018d25	65	void
718e3744	66	bnc_nexthop_free (struct bgp_nexthop_cache *bnc)
	67	{
	68	struct nexthop *nexthop;
	69	struct nexthop *next = NULL;
	70
	71	for (nexthop = bnc->nexthop; nexthop; nexthop = next)
	72	{
	73	next = nexthop->next;
	74	XFREE (MTYPE_NEXTHOP, nexthop);
	75	}
	76	}
	77
fb018d25	78	struct bgp_nexthop_cache *
ffd0c037	79	bnc_new (void)
718e3744	80	{
fb018d25 DS	81	struct bgp_nexthop_cache *bnc;
	82
	83	bnc = XCALLOC (MTYPE_BGP_NEXTHOP_CACHE, sizeof (struct bgp_nexthop_cache));
	84	LIST_INIT(&(bnc->paths));
	85	return bnc;
718e3744	86	}
718e3744	87
fb018d25	88	void
718e3744	89	bnc_free (struct bgp_nexthop_cache *bnc)
	90	{
	91	bnc_nexthop_free (bnc);
	92	XFREE (MTYPE_BGP_NEXTHOP_CACHE, bnc);
	93	}
6b0655a2	94
718e3744	95	/* Reset and free all BGP nexthop cache. */
94f2b392	96	static void
718e3744	97	bgp_nexthop_cache_reset (struct bgp_table *table)
	98	{
	99	struct bgp_node *rn;
	100	struct bgp_nexthop_cache *bnc;
	101
	102	for (rn = bgp_table_top (table); rn; rn = bgp_route_next (rn))
	103	if ((bnc = rn->info) != NULL)
	104	{
	105	bnc_free (bnc);
	106	rn->info = NULL;
	107	bgp_unlock_node (rn);
	108	}
	109	}
	110
10f9bf3f JBD	111	/* BGP own address structure */
	112	struct bgp_addr
	113	{
	114	struct in_addr addr;
	115	int refcnt;
	116	};
	117
	118	static struct hash *bgp_address_hash;
	119
	120	static void *
	121	bgp_address_hash_alloc (void *p)
	122	{
ffd0c037	123	const struct in_addr val = (const struct in_addr )p;
10f9bf3f JBD	124	struct bgp_addr *addr;
	125
	126	addr = XMALLOC (MTYPE_BGP_ADDR, sizeof (struct bgp_addr));
	127	addr->refcnt = 0;
	128	addr->addr.s_addr = val->s_addr;
	129
	130	return addr;
	131	}
	132
	133	static unsigned int
	134	bgp_address_hash_key_make (void *p)
	135	{
	136	const struct bgp_addr *addr = p;
	137
	138	return jhash_1word(addr->addr.s_addr, 0);
	139	}
	140
	141	static int
	142	bgp_address_hash_cmp (const void p1, const void p2)
	143	{
	144	const struct bgp_addr *addr1 = p1;
	145	const struct bgp_addr *addr2 = p2;
	146
	147	return addr1->addr.s_addr == addr2->addr.s_addr;
	148	}
	149
	150	void
	151	bgp_address_init (void)
	152	{
	153	bgp_address_hash = hash_create (bgp_address_hash_key_make,
	154	bgp_address_hash_cmp);
	155	}
	156
	157	static void
	158	bgp_address_add (struct prefix *p)
	159	{
	160	struct bgp_addr tmp;
	161	struct bgp_addr *addr;
	162
	163	tmp.addr = p->u.prefix4;
	164
	165	addr = hash_get (bgp_address_hash, &tmp, bgp_address_hash_alloc);
5ce10e92 DS	166	if (!addr)
	167	return;
	168
10f9bf3f JBD	169	addr->refcnt++;
	170	}
	171
	172	static void
	173	bgp_address_del (struct prefix *p)
	174	{
	175	struct bgp_addr tmp;
	176	struct bgp_addr *addr;
	177
	178	tmp.addr = p->u.prefix4;
	179
	180	addr = hash_lookup (bgp_address_hash, &tmp);
9e47abd8 RG	181	/* may have been deleted earlier by bgp_interface_down() */
	182	if (addr == NULL)
	183	return;
	184
10f9bf3f JBD	185	addr->refcnt--;
	186
	187	if (addr->refcnt == 0)
	188	{
	189	hash_release (bgp_address_hash, addr);
	190	XFREE (MTYPE_BGP_ADDR, addr);
	191	}
	192	}
	193
6b0655a2	194
5932020b	195	struct bgp_connected_ref
718e3744	196	{
	197	unsigned int refcnt;
	198	};
	199
	200	void
	201	bgp_connected_add (struct connected *ifc)
	202	{
	203	struct prefix p;
	204	struct prefix *addr;
718e3744	205	struct bgp_node *rn;
5932020b	206	struct bgp_connected_ref *bc;
718e3744	207
718e3744	208	addr = ifc->address;
718e3744	209
	210	if (addr->family == AF_INET)
	211	{
e4529636	212	PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
718e3744	213	apply_mask_ipv4 ((struct prefix_ipv4 *) &p);
	214
	215	if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	216	return;
	217
10f9bf3f JBD	218	bgp_address_add (addr);
10f9bf3f JBD	219
5932020b	220	rn = bgp_node_get (bgp_connected_table[AFI_IP], (struct prefix *) &p);
718e3744	221	if (rn->info)
	222	{
	223	bc = rn->info;
	224	bc->refcnt++;
	225	}
	226	else
	227	{
6c88b44d	228	bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
718e3744	229	bc->refcnt = 1;
	230	rn->info = bc;
	231	}
	232	}
	233	#ifdef HAVE_IPV6
e4529636	234	else if (addr->family == AF_INET6)
718e3744	235	{
e4529636	236	PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
718e3744	237	apply_mask_ipv6 ((struct prefix_ipv6 *) &p);
	238
	239	if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	240	return;
	241
	242	if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	243	return;
	244
5932020b	245	rn = bgp_node_get (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
718e3744	246	if (rn->info)
	247	{
	248	bc = rn->info;
	249	bc->refcnt++;
	250	}
	251	else
	252	{
6c88b44d	253	bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
718e3744	254	bc->refcnt = 1;
	255	rn->info = bc;
	256	}
	257	}
	258	#endif /* HAVE_IPV6 */
	259	}
	260
	261	void
	262	bgp_connected_delete (struct connected *ifc)
	263	{
	264	struct prefix p;
	265	struct prefix *addr;
718e3744	266	struct bgp_node *rn;
5932020b	267	struct bgp_connected_ref *bc;
718e3744	268
718e3744	269	addr = ifc->address;
718e3744	270
	271	if (addr->family == AF_INET)
	272	{
e4529636	273	PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
718e3744	274	apply_mask_ipv4 ((struct prefix_ipv4 *) &p);
	275
	276	if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	277	return;
	278
10f9bf3f JBD	279	bgp_address_del (addr);
10f9bf3f JBD	280
5932020b	281	rn = bgp_node_lookup (bgp_connected_table[AFI_IP], &p);
718e3744	282	if (! rn)
	283	return;
	284
	285	bc = rn->info;
	286	bc->refcnt--;
	287	if (bc->refcnt == 0)
	288	{
6c88b44d	289	XFREE (MTYPE_BGP_CONN, bc);
718e3744	290	rn->info = NULL;
	291	}
	292	bgp_unlock_node (rn);
	293	bgp_unlock_node (rn);
	294	}
	295	#ifdef HAVE_IPV6
	296	else if (addr->family == AF_INET6)
	297	{
e4529636	298	PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
718e3744	299	apply_mask_ipv6 ((struct prefix_ipv6 *) &p);
	300
	301	if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	302	return;
	303
	304	if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	305	return;
	306
5932020b	307	rn = bgp_node_lookup (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
718e3744	308	if (! rn)
	309	return;
	310
	311	bc = rn->info;
	312	bc->refcnt--;
	313	if (bc->refcnt == 0)
	314	{
6c88b44d	315	XFREE (MTYPE_BGP_CONN, bc);
718e3744	316	rn->info = NULL;
	317	}
	318	bgp_unlock_node (rn);
	319	bgp_unlock_node (rn);
	320	}
	321	#endif /* HAVE_IPV6 */
	322	}
	323
	324	int
10f9bf3f	325	bgp_nexthop_self (struct attr *attr)
718e3744	326	{
10f9bf3f	327	struct bgp_addr tmp, *addr;
718e3744	328
10f9bf3f JBD	329	tmp.addr = attr->nexthop;
	330
	331	addr = hash_lookup (bgp_address_hash, &tmp);
	332	if (addr)
	333	return 1;
718e3744	334
718e3744	335	return 0;
718e3744	336	}
6b0655a2	337
718e3744	338
718e3744	339	int
fc9a856f	340	bgp_multiaccess_check_v4 (struct in_addr nexthop, struct peer *peer)
718e3744	341	{
	342	struct bgp_node *rn1;
	343	struct bgp_node *rn2;
fc9a856f	344	struct prefix p;
718e3744	345	int ret;
718e3744	346
fc9a856f DS	347	p.family = AF_INET;
	348	p.prefixlen = IPV4_MAX_BITLEN;
	349	p.u.prefix4 = nexthop;
718e3744	350
fc9a856f DS	351	rn1 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
fc9a856f DS	352	if (!rn1)
718e3744	353	return 0;
718e3744	354
fc9a856f DS	355	p.family = AF_INET;
	356	p.prefixlen = IPV4_MAX_BITLEN;
	357	p.u.prefix4 = peer->su.sin.sin_addr;
718e3744	358
fc9a856f DS	359	rn2 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
fc9a856f DS	360	if (!rn2)
718e3744	361	{
fc9a856f DS	362	bgp_unlock_node(rn1);
fc9a856f DS	363	return 0;
718e3744	364	}
718e3744	365
fc9a856f	366	ret = (rn1 == rn2) ? 1 : 0;
718e3744	367
fc9a856f DS	368	bgp_unlock_node(rn1);
fc9a856f DS	369	bgp_unlock_node(rn2);
718e3744	370
fc9a856f	371	return (ret);
718e3744	372	}
718e3744	373
fb018d25 DS	374	static int
	375	show_ip_bgp_nexthop_table (struct vty *vty, int detail)
	376	{
	377	struct bgp_node *rn;
	378	struct bgp_nexthop_cache *bnc;
	379	char buf[INET6_ADDRSTRLEN];
77217fd4	380	struct nexthop *nexthop;
fb018d25	381	time_t tbuf;
fb018d25 DS	382
	383	vty_out (vty, "Current BGP nexthop cache:%s", VTY_NEWLINE);
	384	for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP]); rn; rn = bgp_route_next (rn))
	385	if ((bnc = rn->info) != NULL)
	386	{
	387	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	388	{
	389	vty_out (vty, " %s valid [IGP metric %d], #paths %d%s",
	390	inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN),
	391	bnc->metric, bnc->path_count, VTY_NEWLINE);
	392	if (detail)
77217fd4 DS	393	for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
	394	switch (nexthop->type)
	395	{
	396	case NEXTHOP_TYPE_IPV4:
	397	vty_out (vty, " gate %s%s",
	398	inet_ntop (AF_INET, &nexthop->gate.ipv4, buf,
	399	INET6_ADDRSTRLEN), VTY_NEWLINE);
	400	break;
	401	case NEXTHOP_TYPE_IFINDEX:
	402	vty_out (vty, " if %s%s",
	403	ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
	404	break;
	405	case NEXTHOP_TYPE_IPV4_IFINDEX:
	406	vty_out (vty, " gate %s, if %s%s",
	407	inet_ntop(AF_INET, &nexthop->gate.ipv4, buf,
	408	INET6_ADDRSTRLEN),
	409	ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
	410	break;
	411	default:
	412	vty_out (vty, " invalid nexthop type %u%s",
	413	nexthop->type, VTY_NEWLINE);
	414	}
fb018d25 DS	415	}
fb018d25 DS	416	else
8d73e1db DS	417	{
	418	vty_out (vty, " %s invalid%s",
	419	inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN), VTY_NEWLINE);
	420
	421	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED))
	422	vty_out (vty, " Must be Connected%s", VTY_NEWLINE);
	423	}
fb018d25 DS	424	#ifdef HAVE_CLOCK_MONOTONIC
	425	tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	426	vty_out (vty, " Last update: %s", ctime(&tbuf));
	427	#else
	428	vty_out (vty, " Last update: %s", ctime(&bnc->uptime));
	429	#endif /* HAVE_CLOCK_MONOTONIC */
	430
	431	vty_out(vty, "%s", VTY_NEWLINE);
	432	}
	433
	434	#ifdef HAVE_IPV6
	435	{
	436	for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP6]);
	437	rn;
	438	rn = bgp_route_next (rn))
	439	if ((bnc = rn->info) != NULL)
	440	{
	441	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	442	{
	443	vty_out (vty, " %s valid [IGP metric %d]%s",
	444	inet_ntop (AF_INET6, &rn->p.u.prefix6, buf,
	445	INET6_ADDRSTRLEN),
	446	bnc->metric, VTY_NEWLINE);
	447	if (detail)
77217fd4 DS	448	for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
	449	switch (nexthop->type)
	450	{
	451	case NEXTHOP_TYPE_IPV6:
	452	vty_out (vty, " gate %s%s",
	453	inet_ntop (AF_INET6, &nexthop->gate.ipv6,
	454	buf, INET6_ADDRSTRLEN), VTY_NEWLINE);
	455	break;
	456	case NEXTHOP_TYPE_IPV6_IFINDEX:
	457	vty_out(vty, " gate %s, if %s%s",
	458	inet_ntop(AF_INET6, &nexthop->gate.ipv6, buf,
	459	INET6_ADDRSTRLEN),
	460	ifindex2ifname(nexthop->ifindex),
	461	VTY_NEWLINE);
	462	break;
	463	case NEXTHOP_TYPE_IFINDEX:
	464	vty_out (vty, " ifidx %u%s", nexthop->ifindex,
	465	VTY_NEWLINE);
	466	break;
	467	default:
	468	vty_out (vty, " invalid nexthop type %u%s",
	469	nexthop->type, VTY_NEWLINE);
	470	}
fb018d25 DS	471	}
fb018d25 DS	472	else
8d73e1db DS	473	{
	474	vty_out (vty, " %s invalid%s",
	475	inet_ntop (AF_INET6, &rn->p.u.prefix6, buf, INET6_ADDRSTRLEN),
	476	VTY_NEWLINE);
	477
	478	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_CONNECTED))
	479	vty_out (vty, " Must be Connected%s", VTY_NEWLINE);
	480	}
fb018d25 DS	481	#ifdef HAVE_CLOCK_MONOTONIC
	482	tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	483	vty_out (vty, " Last update: %s", ctime(&tbuf));
	484	#else
	485	vty_out (vty, " Last update: %s", ctime(&bnc->uptime));
	486	#endif /* HAVE_CLOCK_MONOTONIC */
	487
	488	vty_out(vty, "%s", VTY_NEWLINE);
	489	}
	490	}
	491	#endif /* HAVE_IPV6 */
	492	return CMD_SUCCESS;
	493	}
	494
fb018d25 DS	495	DEFUN (show_ip_bgp_nexthop,
	496	show_ip_bgp_nexthop_cmd,
	497	"show ip bgp nexthop",
	498	SHOW_STR
	499	IP_STR
	500	BGP_STR
	501	"BGP nexthop table\n")
	502	{
	503	return show_ip_bgp_nexthop_table (vty, 0);
	504	}
	505
	506	DEFUN (show_ip_bgp_nexthop_detail,
	507	show_ip_bgp_nexthop_detail_cmd,
	508	"show ip bgp nexthop detail",
	509	SHOW_STR
	510	IP_STR
	511	BGP_STR
	512	"BGP nexthop table\n")
	513	{
	514	return show_ip_bgp_nexthop_table (vty, 1);
	515	}
	516
718e3744	517	void
66e5cd87	518	bgp_scan_init (void)
718e3744	519	{
078430f6	520	bgp_nexthop_cache_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
64e580a7	521	bgp_connected_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
078430f6	522	bgp_import_check_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
718e3744	523
718e3744	524	#ifdef HAVE_IPV6
078430f6	525	bgp_nexthop_cache_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
64e580a7	526	bgp_connected_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
078430f6	527	bgp_import_check_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
718e3744	528	#endif /* HAVE_IPV6 */
718e3744	529
fc9a856f DS	530	}
	531
	532	void
ffd0c037	533	bgp_scan_vty_init (void)
fc9a856f DS	534	{
fc9a856f DS	535	install_element (ENABLE_NODE, &show_ip_bgp_nexthop_cmd);
fb018d25 DS	536	install_element (VIEW_NODE, &show_ip_bgp_nexthop_cmd);
fb018d25 DS	537	install_element (VIEW_NODE, &show_ip_bgp_nexthop_detail_cmd);
fb018d25	538	install_element (ENABLE_NODE, &show_ip_bgp_nexthop_detail_cmd);
718e3744	539	}
228da428 CC	540
	541	void
	542	bgp_scan_finish (void)
	543	{
6c88b44d CC	544	/* Only the current one needs to be reset. */
	545	bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP]);
	546
078430f6 DS	547	bgp_table_unlock (bgp_nexthop_cache_table[AFI_IP]);
078430f6 DS	548	bgp_nexthop_cache_table[AFI_IP] = NULL;
228da428	549
228da428 CC	550	bgp_table_unlock (bgp_connected_table[AFI_IP]);
	551	bgp_connected_table[AFI_IP] = NULL;
	552
078430f6 DS	553	bgp_table_unlock (bgp_import_check_table[AFI_IP]);
	554	bgp_import_check_table[AFI_IP] = NULL;
	555
228da428	556	#ifdef HAVE_IPV6
6c88b44d CC	557	/* Only the current one needs to be reset. */
	558	bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP6]);
	559
078430f6 DS	560	bgp_table_unlock (bgp_nexthop_cache_table[AFI_IP6]);
078430f6 DS	561	bgp_nexthop_cache_table[AFI_IP6] = NULL;
228da428	562
228da428 CC	563	bgp_table_unlock (bgp_connected_table[AFI_IP6]);
228da428 CC	564	bgp_connected_table[AFI_IP6] = NULL;
078430f6 DS	565
	566	bgp_table_unlock (bgp_import_check_table[AFI_IP6]);
	567	bgp_import_check_table[AFI_IP6] = NULL;
228da428 CC	568	#endif /* HAVE_IPV6 */
228da428 CC	569	}