[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 "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];
static struct bgp_table *cache1_table[AFI_MAX];

/* Route table for connected route. */
static struct bgp_table *bgp_connected_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 ()
{
  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);
}

/* If nexthop exists on connected network return 1. */
int
bgp_nexthop_onlink (afi_t afi, struct attr *attr)
{
  struct bgp_node *rn;
  
  /* Lookup the address is onlink or not. */
  if (afi == AFI_IP)
    {
      rn = bgp_node_match_ipv4 (bgp_connected_table[AFI_IP], &attr->nexthop);
      if (rn)
	{
	  bgp_unlock_node (rn);
	  return 1;
	}
    }
#ifdef HAVE_IPV6
  else if (afi == AFI_IP6)
    {
      if (attr->extra->mp_nexthop_len == 32)
	return 1;
      else if (attr->extra->mp_nexthop_len == 16)
	{
	  if (IN6_IS_ADDR_LINKLOCAL (&attr->extra->mp_nexthop_global))
	    return 1;

	  rn = bgp_node_match_ipv6 (bgp_connected_table[AFI_IP6],
				      &attr->extra->mp_nexthop_global);
	  if (rn)
	    {
	      bgp_unlock_node (rn);
	      return 1;
	    }
	}
    }
#endif /* HAVE_IPV6 */
  return 0;
}

/* 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)
{
  struct in_addr *val = 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 interface *ifp;
  struct bgp_node *rn;
  struct bgp_connected_ref *bc;

  ifp = ifc->ifp;

  if (! ifp)
    return;

  if (if_is_loopback (ifp))
    return;

  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 interface *ifp;
  struct bgp_node *rn;
  struct bgp_connected_ref *bc;

  ifp = ifc->ifp;

  if (if_is_loopback (ifp))
    return;

  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;
  u_char i;

  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);
#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);
#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)
{
  cache1_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
  bgp_nexthop_cache_table[AFI_IP] = cache1_table[AFI_IP];

  bgp_connected_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);

#ifdef HAVE_IPV6
  cache1_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
  bgp_nexthop_cache_table[AFI_IP6] = cache1_table[AFI_IP6];
  bgp_connected_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
#endif /* HAVE_IPV6 */

}

void
bgp_scan_vty_init()
{
  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 (cache1_table[AFI_IP]);
  cache1_table[AFI_IP] = NULL;

  bgp_table_unlock (bgp_connected_table[AFI_IP]);
  bgp_connected_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 (cache1_table[AFI_IP6]);
  cache1_table[AFI_IP6] = NULL;

  bgp_table_unlock (bgp_connected_table[AFI_IP6]);
  bgp_connected_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"
718e3744	34
	35	#include "bgpd/bgpd.h"
	36	#include "bgpd/bgp_table.h"
	37	#include "bgpd/bgp_route.h"
	38	#include "bgpd/bgp_attr.h"
	39	#include "bgpd/bgp_nexthop.h"
fb018d25	40	#include "bgpd/bgp_nht.h"
718e3744	41	#include "bgpd/bgp_debug.h"
	42	#include "bgpd/bgp_damp.h"
	43	#include "zebra/rib.h"
	44	#include "zebra/zserv.h" /* For ZEBRA_SERV_PATH. */
	45
fb018d25	46
718e3744	47
718e3744	48	/* Route table for next-hop lookup cache. */
fb018d25	49	struct bgp_table *bgp_nexthop_cache_table[AFI_MAX];
00d252cb	50	static struct bgp_table *cache1_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
6b0655a2	55
fb018d25 DS	56	char *
	57	bnc_str (struct bgp_nexthop_cache bnc, char buf, int size)
	58	{
	59	prefix2str(&(bnc->node->p), buf, size);
	60	return buf;
	61	}
	62
fb018d25	63	void
718e3744	64	bnc_nexthop_free (struct bgp_nexthop_cache *bnc)
	65	{
	66	struct nexthop *nexthop;
	67	struct nexthop *next = NULL;
	68
	69	for (nexthop = bnc->nexthop; nexthop; nexthop = next)
	70	{
	71	next = nexthop->next;
	72	XFREE (MTYPE_NEXTHOP, nexthop);
	73	}
	74	}
	75
fb018d25 DS	76	struct bgp_nexthop_cache *
fb018d25 DS	77	bnc_new ()
718e3744	78	{
fb018d25 DS	79	struct bgp_nexthop_cache *bnc;
	80
	81	bnc = XCALLOC (MTYPE_BGP_NEXTHOP_CACHE, sizeof (struct bgp_nexthop_cache));
	82	LIST_INIT(&(bnc->paths));
	83	return bnc;
718e3744	84	}
718e3744	85
fb018d25	86	void
718e3744	87	bnc_free (struct bgp_nexthop_cache *bnc)
	88	{
	89	bnc_nexthop_free (bnc);
	90	XFREE (MTYPE_BGP_NEXTHOP_CACHE, bnc);
	91	}
6b0655a2	92
718e3744	93	/* If nexthop exists on connected network return 1. */
718e3744	94	int
8e80bdf2	95	bgp_nexthop_onlink (afi_t afi, struct attr *attr)
718e3744	96	{
718e3744	97	struct bgp_node *rn;
fc98d16e	98
718e3744	99	/* Lookup the address is onlink or not. */
	100	if (afi == AFI_IP)
	101	{
5932020b	102	rn = bgp_node_match_ipv4 (bgp_connected_table[AFI_IP], &attr->nexthop);
718e3744	103	if (rn)
	104	{
	105	bgp_unlock_node (rn);
	106	return 1;
	107	}
	108	}
	109	#ifdef HAVE_IPV6
	110	else if (afi == AFI_IP6)
	111	{
fb982c25	112	if (attr->extra->mp_nexthop_len == 32)
718e3744	113	return 1;
fb982c25	114	else if (attr->extra->mp_nexthop_len == 16)
718e3744	115	{
fb982c25	116	if (IN6_IS_ADDR_LINKLOCAL (&attr->extra->mp_nexthop_global))
718e3744	117	return 1;
718e3744	118
5932020b	119	rn = bgp_node_match_ipv6 (bgp_connected_table[AFI_IP6],
fb982c25	120	&attr->extra->mp_nexthop_global);
718e3744	121	if (rn)
	122	{
	123	bgp_unlock_node (rn);
	124	return 1;
	125	}
	126	}
	127	}
	128	#endif /* HAVE_IPV6 */
	129	return 0;
	130	}
	131
718e3744	132	/* Reset and free all BGP nexthop cache. */
94f2b392	133	static void
718e3744	134	bgp_nexthop_cache_reset (struct bgp_table *table)
	135	{
	136	struct bgp_node *rn;
	137	struct bgp_nexthop_cache *bnc;
	138
	139	for (rn = bgp_table_top (table); rn; rn = bgp_route_next (rn))
	140	if ((bnc = rn->info) != NULL)
	141	{
	142	bnc_free (bnc);
	143	rn->info = NULL;
	144	bgp_unlock_node (rn);
	145	}
	146	}
	147
10f9bf3f JBD	148	/* BGP own address structure */
	149	struct bgp_addr
	150	{
	151	struct in_addr addr;
	152	int refcnt;
	153	};
	154
	155	static struct hash *bgp_address_hash;
	156
	157	static void *
	158	bgp_address_hash_alloc (void *p)
	159	{
	160	struct in_addr *val = p;
	161	struct bgp_addr *addr;
	162
	163	addr = XMALLOC (MTYPE_BGP_ADDR, sizeof (struct bgp_addr));
	164	addr->refcnt = 0;
	165	addr->addr.s_addr = val->s_addr;
	166
	167	return addr;
	168	}
	169
	170	static unsigned int
	171	bgp_address_hash_key_make (void *p)
	172	{
	173	const struct bgp_addr *addr = p;
	174
	175	return jhash_1word(addr->addr.s_addr, 0);
	176	}
	177
	178	static int
	179	bgp_address_hash_cmp (const void p1, const void p2)
	180	{
	181	const struct bgp_addr *addr1 = p1;
	182	const struct bgp_addr *addr2 = p2;
	183
	184	return addr1->addr.s_addr == addr2->addr.s_addr;
	185	}
	186
	187	void
	188	bgp_address_init (void)
	189	{
	190	bgp_address_hash = hash_create (bgp_address_hash_key_make,
	191	bgp_address_hash_cmp);
	192	}
	193
	194	static void
	195	bgp_address_add (struct prefix *p)
	196	{
	197	struct bgp_addr tmp;
	198	struct bgp_addr *addr;
	199
	200	tmp.addr = p->u.prefix4;
	201
	202	addr = hash_get (bgp_address_hash, &tmp, bgp_address_hash_alloc);
5ce10e92 DS	203	if (!addr)
	204	return;
	205
10f9bf3f JBD	206	addr->refcnt++;
	207	}
	208
	209	static void
	210	bgp_address_del (struct prefix *p)
	211	{
	212	struct bgp_addr tmp;
	213	struct bgp_addr *addr;
	214
	215	tmp.addr = p->u.prefix4;
	216
	217	addr = hash_lookup (bgp_address_hash, &tmp);
9e47abd8 RG	218	/* may have been deleted earlier by bgp_interface_down() */
	219	if (addr == NULL)
	220	return;
	221
10f9bf3f JBD	222	addr->refcnt--;
	223
	224	if (addr->refcnt == 0)
	225	{
	226	hash_release (bgp_address_hash, addr);
	227	XFREE (MTYPE_BGP_ADDR, addr);
	228	}
	229	}
	230
6b0655a2	231
5932020b	232	struct bgp_connected_ref
718e3744	233	{
	234	unsigned int refcnt;
	235	};
	236
	237	void
	238	bgp_connected_add (struct connected *ifc)
	239	{
	240	struct prefix p;
	241	struct prefix *addr;
718e3744	242	struct interface *ifp;
718e3744	243	struct bgp_node *rn;
5932020b	244	struct bgp_connected_ref *bc;
718e3744	245
	246	ifp = ifc->ifp;
	247
	248	if (! ifp)
	249	return;
	250
	251	if (if_is_loopback (ifp))
	252	return;
	253
	254	addr = ifc->address;
718e3744	255
	256	if (addr->family == AF_INET)
	257	{
e4529636	258	PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
718e3744	259	apply_mask_ipv4 ((struct prefix_ipv4 *) &p);
	260
	261	if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	262	return;
	263
10f9bf3f JBD	264	bgp_address_add (addr);
10f9bf3f JBD	265
5932020b	266	rn = bgp_node_get (bgp_connected_table[AFI_IP], (struct prefix *) &p);
718e3744	267	if (rn->info)
	268	{
	269	bc = rn->info;
	270	bc->refcnt++;
	271	}
	272	else
	273	{
6c88b44d	274	bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
718e3744	275	bc->refcnt = 1;
	276	rn->info = bc;
	277	}
	278	}
	279	#ifdef HAVE_IPV6
e4529636	280	else if (addr->family == AF_INET6)
718e3744	281	{
e4529636	282	PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
718e3744	283	apply_mask_ipv6 ((struct prefix_ipv6 *) &p);
	284
	285	if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	286	return;
	287
	288	if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	289	return;
	290
5932020b	291	rn = bgp_node_get (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
718e3744	292	if (rn->info)
	293	{
	294	bc = rn->info;
	295	bc->refcnt++;
	296	}
	297	else
	298	{
6c88b44d	299	bc = XCALLOC (MTYPE_BGP_CONN, sizeof (struct bgp_connected_ref));
718e3744	300	bc->refcnt = 1;
	301	rn->info = bc;
	302	}
	303	}
	304	#endif /* HAVE_IPV6 */
	305	}
	306
	307	void
	308	bgp_connected_delete (struct connected *ifc)
	309	{
	310	struct prefix p;
	311	struct prefix *addr;
718e3744	312	struct interface *ifp;
718e3744	313	struct bgp_node *rn;
5932020b	314	struct bgp_connected_ref *bc;
718e3744	315
	316	ifp = ifc->ifp;
	317
	318	if (if_is_loopback (ifp))
	319	return;
	320
	321	addr = ifc->address;
718e3744	322
	323	if (addr->family == AF_INET)
	324	{
e4529636	325	PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
718e3744	326	apply_mask_ipv4 ((struct prefix_ipv4 *) &p);
	327
	328	if (prefix_ipv4_any ((struct prefix_ipv4 *) &p))
	329	return;
	330
10f9bf3f JBD	331	bgp_address_del (addr);
10f9bf3f JBD	332
5932020b	333	rn = bgp_node_lookup (bgp_connected_table[AFI_IP], &p);
718e3744	334	if (! rn)
	335	return;
	336
	337	bc = rn->info;
	338	bc->refcnt--;
	339	if (bc->refcnt == 0)
	340	{
6c88b44d	341	XFREE (MTYPE_BGP_CONN, bc);
718e3744	342	rn->info = NULL;
	343	}
	344	bgp_unlock_node (rn);
	345	bgp_unlock_node (rn);
	346	}
	347	#ifdef HAVE_IPV6
	348	else if (addr->family == AF_INET6)
	349	{
e4529636	350	PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
718e3744	351	apply_mask_ipv6 ((struct prefix_ipv6 *) &p);
	352
	353	if (IN6_IS_ADDR_UNSPECIFIED (&p.u.prefix6))
	354	return;
	355
	356	if (IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
	357	return;
	358
5932020b	359	rn = bgp_node_lookup (bgp_connected_table[AFI_IP6], (struct prefix *) &p);
718e3744	360	if (! rn)
	361	return;
	362
	363	bc = rn->info;
	364	bc->refcnt--;
	365	if (bc->refcnt == 0)
	366	{
6c88b44d	367	XFREE (MTYPE_BGP_CONN, bc);
718e3744	368	rn->info = NULL;
	369	}
	370	bgp_unlock_node (rn);
	371	bgp_unlock_node (rn);
	372	}
	373	#endif /* HAVE_IPV6 */
	374	}
	375
	376	int
10f9bf3f	377	bgp_nexthop_self (struct attr *attr)
718e3744	378	{
10f9bf3f	379	struct bgp_addr tmp, *addr;
718e3744	380
10f9bf3f JBD	381	tmp.addr = attr->nexthop;
	382
	383	addr = hash_lookup (bgp_address_hash, &tmp);
	384	if (addr)
	385	return 1;
718e3744	386
718e3744	387	return 0;
718e3744	388	}
6b0655a2	389
718e3744	390
718e3744	391	int
fc9a856f	392	bgp_multiaccess_check_v4 (struct in_addr nexthop, struct peer *peer)
718e3744	393	{
	394	struct bgp_node *rn1;
	395	struct bgp_node *rn2;
fc9a856f	396	struct prefix p;
718e3744	397	int ret;
718e3744	398
fc9a856f DS	399	p.family = AF_INET;
	400	p.prefixlen = IPV4_MAX_BITLEN;
	401	p.u.prefix4 = nexthop;
718e3744	402
fc9a856f DS	403	rn1 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
fc9a856f DS	404	if (!rn1)
718e3744	405	return 0;
718e3744	406
fc9a856f DS	407	p.family = AF_INET;
	408	p.prefixlen = IPV4_MAX_BITLEN;
	409	p.u.prefix4 = peer->su.sin.sin_addr;
718e3744	410
fc9a856f DS	411	rn2 = bgp_node_match (bgp_connected_table[AFI_IP], &p);
fc9a856f DS	412	if (!rn2)
718e3744	413	{
fc9a856f DS	414	bgp_unlock_node(rn1);
fc9a856f DS	415	return 0;
718e3744	416	}
718e3744	417
fc9a856f	418	ret = (rn1 == rn2) ? 1 : 0;
718e3744	419
fc9a856f DS	420	bgp_unlock_node(rn1);
fc9a856f DS	421	bgp_unlock_node(rn2);
718e3744	422
fc9a856f	423	return (ret);
718e3744	424	}
718e3744	425
fb018d25 DS	426	static int
	427	show_ip_bgp_nexthop_table (struct vty *vty, int detail)
	428	{
	429	struct bgp_node *rn;
	430	struct bgp_nexthop_cache *bnc;
	431	char buf[INET6_ADDRSTRLEN];
77217fd4	432	struct nexthop *nexthop;
fb018d25 DS	433	time_t tbuf;
	434	u_char i;
	435
	436	vty_out (vty, "Current BGP nexthop cache:%s", VTY_NEWLINE);
	437	for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP]); rn; rn = bgp_route_next (rn))
	438	if ((bnc = rn->info) != NULL)
	439	{
	440	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	441	{
	442	vty_out (vty, " %s valid [IGP metric %d], #paths %d%s",
	443	inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN),
	444	bnc->metric, bnc->path_count, VTY_NEWLINE);
	445	if (detail)
77217fd4 DS	446	for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
	447	switch (nexthop->type)
	448	{
	449	case NEXTHOP_TYPE_IPV4:
	450	vty_out (vty, " gate %s%s",
	451	inet_ntop (AF_INET, &nexthop->gate.ipv4, buf,
	452	INET6_ADDRSTRLEN), VTY_NEWLINE);
	453	break;
	454	case NEXTHOP_TYPE_IFINDEX:
	455	vty_out (vty, " if %s%s",
	456	ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
	457	break;
	458	case NEXTHOP_TYPE_IPV4_IFINDEX:
	459	vty_out (vty, " gate %s, if %s%s",
	460	inet_ntop(AF_INET, &nexthop->gate.ipv4, buf,
	461	INET6_ADDRSTRLEN),
	462	ifindex2ifname(nexthop->ifindex), VTY_NEWLINE);
	463	break;
	464	default:
	465	vty_out (vty, " invalid nexthop type %u%s",
	466	nexthop->type, VTY_NEWLINE);
	467	}
fb018d25 DS	468	}
	469	else
	470	vty_out (vty, " %s invalid%s",
	471	inet_ntop (AF_INET, &rn->p.u.prefix4, buf, INET6_ADDRSTRLEN), VTY_NEWLINE);
	472	#ifdef HAVE_CLOCK_MONOTONIC
	473	tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	474	vty_out (vty, " Last update: %s", ctime(&tbuf));
	475	#else
	476	vty_out (vty, " Last update: %s", ctime(&bnc->uptime));
	477	#endif /* HAVE_CLOCK_MONOTONIC */
	478
	479	vty_out(vty, "%s", VTY_NEWLINE);
	480	}
	481
	482	#ifdef HAVE_IPV6
	483	{
	484	for (rn = bgp_table_top (bgp_nexthop_cache_table[AFI_IP6]);
	485	rn;
	486	rn = bgp_route_next (rn))
	487	if ((bnc = rn->info) != NULL)
	488	{
	489	if (CHECK_FLAG(bnc->flags, BGP_NEXTHOP_VALID))
	490	{
	491	vty_out (vty, " %s valid [IGP metric %d]%s",
	492	inet_ntop (AF_INET6, &rn->p.u.prefix6, buf,
	493	INET6_ADDRSTRLEN),
	494	bnc->metric, VTY_NEWLINE);
	495	if (detail)
77217fd4 DS	496	for (nexthop = bnc->nexthop; nexthop; nexthop = nexthop->next)
	497	switch (nexthop->type)
	498	{
	499	case NEXTHOP_TYPE_IPV6:
	500	vty_out (vty, " gate %s%s",
	501	inet_ntop (AF_INET6, &nexthop->gate.ipv6,
	502	buf, INET6_ADDRSTRLEN), VTY_NEWLINE);
	503	break;
	504	case NEXTHOP_TYPE_IPV6_IFINDEX:
	505	vty_out(vty, " gate %s, if %s%s",
	506	inet_ntop(AF_INET6, &nexthop->gate.ipv6, buf,
	507	INET6_ADDRSTRLEN),
	508	ifindex2ifname(nexthop->ifindex),
	509	VTY_NEWLINE);
	510	break;
	511	case NEXTHOP_TYPE_IFINDEX:
	512	vty_out (vty, " ifidx %u%s", nexthop->ifindex,
	513	VTY_NEWLINE);
	514	break;
	515	default:
	516	vty_out (vty, " invalid nexthop type %u%s",
	517	nexthop->type, VTY_NEWLINE);
	518	}
fb018d25 DS	519	}
	520	else
	521	vty_out (vty, " %s invalid%s",
	522	inet_ntop (AF_INET6, &rn->p.u.prefix6, buf, INET6_ADDRSTRLEN),
	523	VTY_NEWLINE);
	524	#ifdef HAVE_CLOCK_MONOTONIC
	525	tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
	526	vty_out (vty, " Last update: %s", ctime(&tbuf));
	527	#else
	528	vty_out (vty, " Last update: %s", ctime(&bnc->uptime));
	529	#endif /* HAVE_CLOCK_MONOTONIC */
	530
	531	vty_out(vty, "%s", VTY_NEWLINE);
	532	}
	533	}
	534	#endif /* HAVE_IPV6 */
	535	return CMD_SUCCESS;
	536	}
	537
fb018d25 DS	538	DEFUN (show_ip_bgp_nexthop,
	539	show_ip_bgp_nexthop_cmd,
	540	"show ip bgp nexthop",
	541	SHOW_STR
	542	IP_STR
	543	BGP_STR
	544	"BGP nexthop table\n")
	545	{
	546	return show_ip_bgp_nexthop_table (vty, 0);
	547	}
	548
	549	DEFUN (show_ip_bgp_nexthop_detail,
	550	show_ip_bgp_nexthop_detail_cmd,
	551	"show ip bgp nexthop detail",
	552	SHOW_STR
	553	IP_STR
	554	BGP_STR
	555	"BGP nexthop table\n")
	556	{
	557	return show_ip_bgp_nexthop_table (vty, 1);
	558	}
	559
718e3744	560	void
66e5cd87	561	bgp_scan_init (void)
718e3744	562	{
64e580a7	563	cache1_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
5932020b	564	bgp_nexthop_cache_table[AFI_IP] = cache1_table[AFI_IP];
718e3744	565
64e580a7	566	bgp_connected_table[AFI_IP] = bgp_table_init (AFI_IP, SAFI_UNICAST);
718e3744	567
718e3744	568	#ifdef HAVE_IPV6
64e580a7	569	cache1_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
5932020b	570	bgp_nexthop_cache_table[AFI_IP6] = cache1_table[AFI_IP6];
64e580a7	571	bgp_connected_table[AFI_IP6] = bgp_table_init (AFI_IP6, SAFI_UNICAST);
718e3744	572	#endif /* HAVE_IPV6 */
718e3744	573
fc9a856f DS	574	}
	575
	576	void
	577	bgp_scan_vty_init()
	578	{
	579	install_element (ENABLE_NODE, &show_ip_bgp_nexthop_cmd);
fb018d25 DS	580	install_element (VIEW_NODE, &show_ip_bgp_nexthop_cmd);
fb018d25 DS	581	install_element (VIEW_NODE, &show_ip_bgp_nexthop_detail_cmd);
fb018d25	582	install_element (ENABLE_NODE, &show_ip_bgp_nexthop_detail_cmd);
718e3744	583	}
228da428 CC	584
	585	void
	586	bgp_scan_finish (void)
	587	{
6c88b44d CC	588	/* Only the current one needs to be reset. */
	589	bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP]);
	590
228da428 CC	591	bgp_table_unlock (cache1_table[AFI_IP]);
	592	cache1_table[AFI_IP] = NULL;
	593
228da428 CC	594	bgp_table_unlock (bgp_connected_table[AFI_IP]);
	595	bgp_connected_table[AFI_IP] = NULL;
	596
	597	#ifdef HAVE_IPV6
6c88b44d CC	598	/* Only the current one needs to be reset. */
	599	bgp_nexthop_cache_reset (bgp_nexthop_cache_table[AFI_IP6]);
	600
228da428 CC	601	bgp_table_unlock (cache1_table[AFI_IP6]);
	602	cache1_table[AFI_IP6] = NULL;
	603
228da428 CC	604	bgp_table_unlock (bgp_connected_table[AFI_IP6]);
	605	bgp_connected_table[AFI_IP6] = NULL;
	606	#endif /* HAVE_IPV6 */
	607	}