[mirror_frr.git] / zebra / rt_socket.c

/*
 * Kernel routing table updates by routing socket.
 * Copyright (C) 1997, 98 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 "if.h"
#include "prefix.h"
#include "sockunion.h"
#include "log.h"
#include "str.h"
#include "privs.h"

#include "zebra/debug.h"
#include "zebra/rib.h"
#include "zebra/rt.h"
#include "zebra/kernel_socket.h"

extern struct zebra_privs_t zserv_privs;

/* kernel socket export */
extern int rtm_write (int message, union sockunion *dest,
                      union sockunion *mask, union sockunion *gate,
                      unsigned int index, int zebra_flags, int metric);

#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
/* Adjust netmask socket length. Return value is a adjusted sin_len
   value. */
static int
sin_masklen (struct in_addr mask)
{
  char *p, *lim;
  int len;
  struct sockaddr_in sin;

  if (mask.s_addr == 0) 
    return sizeof (long);

  sin.sin_addr = mask;
  len = sizeof (struct sockaddr_in);

  lim = (char *) &sin.sin_addr;
  p = lim + sizeof (sin.sin_addr);

  while (*--p == 0 && p >= lim) 
    len--;
  return len;
}
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */

/* Interface between zebra message and rtm message. */
static int
kernel_rtm_ipv4 (int cmd, struct prefix *p, struct rib *rib, int family)

{
  struct sockaddr_in *mask = NULL;
  struct sockaddr_in sin_dest, sin_mask, sin_gate;
  struct nexthop *nexthop, *tnexthop;
  int recursing;
  int nexthop_num = 0;
  ifindex_t ifindex = 0;
  int gate = 0;
  int error;
  char prefix_buf[PREFIX_STRLEN];

  if (IS_ZEBRA_DEBUG_RIB)
    prefix2str (p, prefix_buf, sizeof(prefix_buf));
  memset (&sin_dest, 0, sizeof (struct sockaddr_in));
  sin_dest.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
  sin_dest.sin_len = sizeof (struct sockaddr_in);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
  sin_dest.sin_addr = p->u.prefix4;

  memset (&sin_mask, 0, sizeof (struct sockaddr_in));

  memset (&sin_gate, 0, sizeof (struct sockaddr_in));
  sin_gate.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
  sin_gate.sin_len = sizeof (struct sockaddr_in);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */

  /* Make gateway. */
  for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
    {
      if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
        continue;

      gate = 0;
      char gate_buf[INET_ADDRSTRLEN] = "NULL";

      /*
       * XXX We need to refrain from kernel operations in some cases,
       * but this if statement seems overly cautious - what about
       * other than ADD and DELETE?
       */
      if ((cmd == RTM_ADD
	   && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
	  || (cmd == RTM_DELETE
	      && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)
	      ))
	{
	  if (nexthop->type == NEXTHOP_TYPE_IPV4 ||
	      nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
	    {
	      sin_gate.sin_addr = nexthop->gate.ipv4;
	      gate = 1;
	    }
	  if (nexthop->type == NEXTHOP_TYPE_IFINDEX
	      || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
	    ifindex = nexthop->ifindex;
	  if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE)
	    {
	      struct in_addr loopback;
	      loopback.s_addr = htonl (INADDR_LOOPBACK);
	      sin_gate.sin_addr = loopback;
	      gate = 1;
	    }

	  if (gate && p->prefixlen == 32)
	    mask = NULL;
	  else
	    {
	      masklen2ip (p->prefixlen, &sin_mask.sin_addr);
	      sin_mask.sin_family = AF_INET;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
	      sin_mask.sin_len = sin_masklen (sin_mask.sin_addr);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
	      mask = &sin_mask;
	    }

	  error = rtm_write (cmd,
			     (union sockunion *)&sin_dest, 
			     (union sockunion *)mask, 
			     gate ? (union sockunion *)&sin_gate : NULL,
			     ifindex,
			     rib->flags,
			     rib->metric);

           if (IS_ZEBRA_DEBUG_RIB)
           {
             if (!gate)
             {
               zlog_debug ("%s: %s: attention! gate not found for rib %p",
                 __func__, prefix_buf, rib);
               rib_dump (p, rib);
             }
             else
               inet_ntop (AF_INET, &sin_gate.sin_addr, gate_buf, INET_ADDRSTRLEN);
           }
 
           switch (error)
           {
             /* We only flag nexthops as being in FIB if rtm_write() did its work. */
             case ZEBRA_ERR_NOERROR:
               nexthop_num++;
               if (IS_ZEBRA_DEBUG_RIB)
                 zlog_debug ("%s: %s: successfully did NH %s",
                   __func__, prefix_buf, gate_buf);
               if (cmd == RTM_ADD)
                 SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
               break;
 
             /* The only valid case for this error is kernel's failure to install
              * a multipath route, which is common for FreeBSD. This should be
              * ignored silently, but logged as an error otherwise.
              */
             case ZEBRA_ERR_RTEXIST:
               if (cmd != RTM_ADD)
                 zlog_err ("%s: rtm_write() returned %d for command %d",
                   __func__, error, cmd);
               continue;
               break;
 
             /* Given that our NEXTHOP_FLAG_FIB matches real kernel FIB, it isn't
              * normal to get any other messages in ANY case.
              */
             case ZEBRA_ERR_RTNOEXIST:
             case ZEBRA_ERR_RTUNREACH:
             default:
               zlog_err ("%s: %s: rtm_write() unexpectedly returned %d for command %s",
                 __func__, prefix2str(p, prefix_buf, sizeof(prefix_buf)),
                 error, lookup (rtm_type_str, cmd));
               break;
           }
         } /* if (cmd and flags make sense) */
       else
         if (IS_ZEBRA_DEBUG_RIB)
           zlog_debug ("%s: odd command %s for flags %d",
             __func__, lookup (rtm_type_str, cmd), nexthop->flags);
     } /* for (ALL_NEXTHOPS_RO(...))*/
 
   /* If there was no useful nexthop, then complain. */
   if (nexthop_num == 0 && IS_ZEBRA_DEBUG_KERNEL)
     zlog_debug ("%s: No useful nexthops were found in RIB entry %p", __func__, rib);

  return 0; /*XXX*/
}

int
kernel_add_ipv4 (struct prefix *p, struct rib *rib)
{
  int route;

  if (zserv_privs.change(ZPRIVS_RAISE))
    zlog (NULL, LOG_ERR, "Can't raise privileges");
  route = kernel_rtm_ipv4 (RTM_ADD, p, rib, AF_INET);
  if (zserv_privs.change(ZPRIVS_LOWER))
    zlog (NULL, LOG_ERR, "Can't lower privileges");

  return route;
}

int
kernel_update_ipv4 (struct prefix *p, struct rib *rib)
{
  kernel_delete_ipv4 (p, rib);
  return kernel_add_ipv4 (p, rib);
}

int
kernel_delete_ipv4 (struct prefix *p, struct rib *rib)
{
  int route;

  if (zserv_privs.change(ZPRIVS_RAISE))
    zlog (NULL, LOG_ERR, "Can't raise privileges");
  route = kernel_rtm_ipv4 (RTM_DELETE, p, rib, AF_INET);
  if (zserv_privs.change(ZPRIVS_LOWER))
    zlog (NULL, LOG_ERR, "Can't lower privileges");

  return route;
}

#ifdef HAVE_IPV6

#ifdef SIN6_LEN
/* Calculate sin6_len value for netmask socket value. */
static int
sin6_masklen (struct in6_addr mask)
{
  struct sockaddr_in6 sin6;
  char *p, *lim;
  int len;

  if (IN6_IS_ADDR_UNSPECIFIED (&mask)) 
    return sizeof (long);

  sin6.sin6_addr = mask;
  len = sizeof (struct sockaddr_in6);

  lim = (char *) & sin6.sin6_addr;
  p = lim + sizeof (sin6.sin6_addr);

  while (*--p == 0 && p >= lim) 
    len--;

  return len;
}
#endif /* SIN6_LEN */

/* Interface between zebra message and rtm message. */
static int
kernel_rtm_ipv6_multipath (int cmd, struct prefix *p, struct rib *rib,
			   int family)
{
  struct sockaddr_in6 *mask;
  struct sockaddr_in6 sin_dest, sin_mask, sin_gate;
  struct nexthop *nexthop, *tnexthop;
  int recursing;
  int nexthop_num = 0;
  ifindex_t ifindex = 0;
  int gate = 0;
  int error;

  memset (&sin_dest, 0, sizeof (struct sockaddr_in6));
  sin_dest.sin6_family = AF_INET6;
#ifdef SIN6_LEN
  sin_dest.sin6_len = sizeof (struct sockaddr_in6);
#endif /* SIN6_LEN */
  sin_dest.sin6_addr = p->u.prefix6;

  memset (&sin_mask, 0, sizeof (struct sockaddr_in6));

  memset (&sin_gate, 0, sizeof (struct sockaddr_in6));
  sin_gate.sin6_family = AF_INET6;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
  sin_gate.sin6_len = sizeof (struct sockaddr_in6);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */

  /* Make gateway. */
  for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
    {
      if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
	continue;

      gate = 0;

      if ((cmd == RTM_ADD
	   && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
	  || (cmd == RTM_DELETE
#if 0
	      && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)
#endif
	      ))
	{
	  if (nexthop->type == NEXTHOP_TYPE_IPV6
	      || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
	    {
	      sin_gate.sin6_addr = nexthop->gate.ipv6;
	      gate = 1;
	    }
	  if (nexthop->type == NEXTHOP_TYPE_IFINDEX
	      || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
	    ifindex = nexthop->ifindex;

	  if (cmd == RTM_ADD)
	    SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
	}

      /* Under kame set interface index to link local address. */
#ifdef KAME

#define SET_IN6_LINKLOCAL_IFINDEX(a, i) \
      do { \
	(a).s6_addr[2] = ((i) >> 8) & 0xff; \
	(a).s6_addr[3] = (i) & 0xff; \
      } while (0)

      if (gate && IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6_addr))
	SET_IN6_LINKLOCAL_IFINDEX (sin_gate.sin6_addr, ifindex);
#endif /* KAME */

      if (gate && p->prefixlen == 128)
	mask = NULL;
      else
	{
	  masklen2ip6 (p->prefixlen, &sin_mask.sin6_addr);
	  sin_mask.sin6_family = AF_INET6;
#ifdef SIN6_LEN
	  sin_mask.sin6_len = sin6_masklen (sin_mask.sin6_addr);
#endif /* SIN6_LEN */
	  mask = &sin_mask;
	}

      error = rtm_write (cmd,
			(union sockunion *) &sin_dest,
			(union sockunion *) mask,
			gate ? (union sockunion *)&sin_gate : NULL,
			ifindex,
			rib->flags,
			rib->metric);

#if 0
      if (error)
	{
	  zlog_info ("kernel_rtm_ipv6_multipath(): nexthop %d add error=%d.",
	    nexthop_num, error);
	}
#else
      (void)error;
#endif

      nexthop_num++;
    }

  /* If there is no useful nexthop then return. */
  if (nexthop_num == 0)
    {
      if (IS_ZEBRA_DEBUG_KERNEL)
	zlog_debug ("kernel_rtm_ipv6_multipath(): No useful nexthop.");
      return 0;
    }

  return 0; /*XXX*/
}

int
kernel_add_ipv6 (struct prefix *p, struct rib *rib)
{
  int route;

  if (zserv_privs.change(ZPRIVS_RAISE))
    zlog (NULL, LOG_ERR, "Can't raise privileges");
  route =  kernel_rtm_ipv6_multipath (RTM_ADD, p, rib, AF_INET6);
  if (zserv_privs.change(ZPRIVS_LOWER))
    zlog (NULL, LOG_ERR, "Can't lower privileges");

  return route;
}

int
kernel_update_ipv6 (struct prefix *p, struct rib *rib)
{
  kernel_delete_ipv6 (p, rib);
  return kernel_add_ipv6 (p, rib);
}

int
kernel_delete_ipv6 (struct prefix *p, struct rib *rib)
{
  int route;

  if (zserv_privs.change(ZPRIVS_RAISE))
    zlog (NULL, LOG_ERR, "Can't raise privileges");
  route =  kernel_rtm_ipv6_multipath (RTM_DELETE, p, rib, AF_INET6);
  if (zserv_privs.change(ZPRIVS_LOWER))
    zlog (NULL, LOG_ERR, "Can't lower privileges");

  return route;
}
#endif /* HAVE_IPV6 */

int
kernel_neigh_update (int add, int ifindex, uint32_t addr, char *lla, int llalen)
{
  /* TODO */
  return 0;
}
Commit	Line	Data
718e3744	1	/*
	2	* Kernel routing table updates by routing socket.
	3	* Copyright (C) 1997, 98 Kunihiro Ishiguro
	4	*
	5	* This file is part of GNU Zebra.
	6	*
	7	* GNU Zebra is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2, or (at your option) any
	10	* later version.
	11	*
	12	* GNU Zebra is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with GNU Zebra; see the file COPYING. If not, write to the Free
	19	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	20	* 02111-1307, USA.
	21	*/
	22
	23	#include <zebra.h>
	24
	25	#include "if.h"
	26	#include "prefix.h"
	27	#include "sockunion.h"
	28	#include "log.h"
	29	#include "str.h"
edd7c245	30	#include "privs.h"
718e3744	31
	32	#include "zebra/debug.h"
	33	#include "zebra/rib.h"
6621ca86	34	#include "zebra/rt.h"
dc95824a	35	#include "zebra/kernel_socket.h"
718e3744	36
edd7c245	37	extern struct zebra_privs_t zserv_privs;
edd7c245	38
6621ca86	39	/* kernel socket export */
	40	extern int rtm_write (int message, union sockunion *dest,
	41	union sockunion mask, union sockunion gate,
	42	unsigned int index, int zebra_flags, int metric);
718e3744	43
746c4f02	44	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
718e3744	45	/* Adjust netmask socket length. Return value is a adjusted sin_len
718e3744	46	value. */
6621ca86	47	static int
718e3744	48	sin_masklen (struct in_addr mask)
	49	{
	50	char p, lim;
	51	int len;
	52	struct sockaddr_in sin;
	53
	54	if (mask.s_addr == 0)
	55	return sizeof (long);
	56
	57	sin.sin_addr = mask;
	58	len = sizeof (struct sockaddr_in);
	59
	60	lim = (char *) &sin.sin_addr;
	61	p = lim + sizeof (sin.sin_addr);
	62
	63	while (*--p == 0 && p >= lim)
	64	len--;
	65	return len;
	66	}
746c4f02	67	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
718e3744	68
718e3744	69	/* Interface between zebra message and rtm message. */
6621ca86	70	static int
718e3744	71	kernel_rtm_ipv4 (int cmd, struct prefix p, struct rib rib, int family)
	72
	73	{
fa2b17e3	74	struct sockaddr_in *mask = NULL;
718e3744	75	struct sockaddr_in sin_dest, sin_mask, sin_gate;
fa713d9e CF	76	struct nexthop nexthop, tnexthop;
fa713d9e CF	77	int recursing;
718e3744	78	int nexthop_num = 0;
b892f1dd	79	ifindex_t ifindex = 0;
718e3744	80	int gate = 0;
718e3744	81	int error;
35d921cc	82	char prefix_buf[PREFIX_STRLEN];
718e3744	83
dc95824a	84	if (IS_ZEBRA_DEBUG_RIB)
35d921cc	85	prefix2str (p, prefix_buf, sizeof(prefix_buf));
718e3744	86	memset (&sin_dest, 0, sizeof (struct sockaddr_in));
718e3744	87	sin_dest.sin_family = AF_INET;
6f0e3f6e	88	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
718e3744	89	sin_dest.sin_len = sizeof (struct sockaddr_in);
6f0e3f6e	90	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
718e3744	91	sin_dest.sin_addr = p->u.prefix4;
	92
	93	memset (&sin_mask, 0, sizeof (struct sockaddr_in));
	94
	95	memset (&sin_gate, 0, sizeof (struct sockaddr_in));
	96	sin_gate.sin_family = AF_INET;
6f0e3f6e	97	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
718e3744	98	sin_gate.sin_len = sizeof (struct sockaddr_in);
6f0e3f6e	99	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
718e3744	100
718e3744	101	/* Make gateway. */
fa713d9e	102	for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
718e3744	103	{
fa713d9e CF	104	if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
	105	continue;
	106
718e3744	107	gate = 0;
dc95824a	108	char gate_buf[INET_ADDRSTRLEN] = "NULL";
718e3744	109
dfdb8f18 GT	110	/*
	111	* XXX We need to refrain from kernel operations in some cases,
	112	* but this if statement seems overly cautious - what about
	113	* other than ADD and DELETE?
	114	*/
718e3744	115	if ((cmd == RTM_ADD
	116	&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
	117	\|\| (cmd == RTM_DELETE
718e3744	118	&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)
718e3744	119	))
718e3744	120	{
fa713d9e CF	121	if (nexthop->type == NEXTHOP_TYPE_IPV4 \|\|
fa713d9e CF	122	nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
718e3744	123	{
fa713d9e CF	124	sin_gate.sin_addr = nexthop->gate.ipv4;
fa713d9e CF	125	gate = 1;
718e3744	126	}
fa713d9e	127	if (nexthop->type == NEXTHOP_TYPE_IFINDEX
fa713d9e CF	128	\|\| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
	129	ifindex = nexthop->ifindex;
	130	if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE)
718e3744	131	{
fa713d9e CF	132	struct in_addr loopback;
	133	loopback.s_addr = htonl (INADDR_LOOPBACK);
	134	sin_gate.sin_addr = loopback;
	135	gate = 1;
dfdb8f18	136	}
718e3744	137
718e3744	138	if (gate && p->prefixlen == 32)
	139	mask = NULL;
	140	else
	141	{
	142	masklen2ip (p->prefixlen, &sin_mask.sin_addr);
6083e1f8	143	sin_mask.sin_family = AF_INET;
6f0e3f6e	144	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
718e3744	145	sin_mask.sin_len = sin_masklen (sin_mask.sin_addr);
6f0e3f6e	146	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
718e3744	147	mask = &sin_mask;
718e3744	148	}
718e3744	149
dfdb8f18 GT	150	error = rtm_write (cmd,
	151	(union sockunion *)&sin_dest,
	152	(union sockunion *)mask,
	153	gate ? (union sockunion *)&sin_gate : NULL,
	154	ifindex,
	155	rib->flags,
	156	rib->metric);
718e3744	157
dc95824a DO	158	if (IS_ZEBRA_DEBUG_RIB)
	159	{
	160	if (!gate)
	161	{
35d921cc TT	162	zlog_debug ("%s: %s: attention! gate not found for rib %p",
35d921cc TT	163	__func__, prefix_buf, rib);
f7bf4153	164	rib_dump (p, rib);
dc95824a DO	165	}
	166	else
	167	inet_ntop (AF_INET, &sin_gate.sin_addr, gate_buf, INET_ADDRSTRLEN);
	168	}
	169
	170	switch (error)
	171	{
	172	/* We only flag nexthops as being in FIB if rtm_write() did its work. */
	173	case ZEBRA_ERR_NOERROR:
	174	nexthop_num++;
	175	if (IS_ZEBRA_DEBUG_RIB)
35d921cc TT	176	zlog_debug ("%s: %s: successfully did NH %s",
35d921cc TT	177	__func__, prefix_buf, gate_buf);
dc95824a DO	178	if (cmd == RTM_ADD)
	179	SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
	180	break;
	181
	182	/* The only valid case for this error is kernel's failure to install
	183	* a multipath route, which is common for FreeBSD. This should be
	184	* ignored silently, but logged as an error otherwise.
	185	*/
	186	case ZEBRA_ERR_RTEXIST:
	187	if (cmd != RTM_ADD)
	188	zlog_err ("%s: rtm_write() returned %d for command %d",
	189	__func__, error, cmd);
	190	continue;
	191	break;
	192
	193	/* Given that our NEXTHOP_FLAG_FIB matches real kernel FIB, it isn't
	194	* normal to get any other messages in ANY case.
	195	*/
	196	case ZEBRA_ERR_RTNOEXIST:
	197	case ZEBRA_ERR_RTUNREACH:
	198	default:
35d921cc TT	199	zlog_err ("%s: %s: rtm_write() unexpectedly returned %d for command %s",
	200	__func__, prefix2str(p, prefix_buf, sizeof(prefix_buf)),
	201	error, lookup (rtm_type_str, cmd));
dc95824a DO	202	break;
	203	}
	204	} /* if (cmd and flags make sense) */
	205	else
	206	if (IS_ZEBRA_DEBUG_RIB)
	207	zlog_debug ("%s: odd command %s for flags %d",
2d844524	208	__func__, lookup (rtm_type_str, cmd), nexthop->flags);
fa713d9e	209	} /* for (ALL_NEXTHOPS_RO(...))*/
dc95824a DO	210
	211	/* If there was no useful nexthop, then complain. */
	212	if (nexthop_num == 0 && IS_ZEBRA_DEBUG_KERNEL)
	213	zlog_debug ("%s: No useful nexthops were found in RIB entry %p", __func__, rib);
718e3744	214
	215	return 0; /XXX/
	216	}
	217
	218	int
	219	kernel_add_ipv4 (struct prefix p, struct rib rib)
	220	{
edd7c245	221	int route;
	222
	223	if (zserv_privs.change(ZPRIVS_RAISE))
	224	zlog (NULL, LOG_ERR, "Can't raise privileges");
	225	route = kernel_rtm_ipv4 (RTM_ADD, p, rib, AF_INET);
	226	if (zserv_privs.change(ZPRIVS_LOWER))
	227	zlog (NULL, LOG_ERR, "Can't lower privileges");
	228
	229	return route;
718e3744	230	}
718e3744	231
6ae24471 DS	232	int
	233	kernel_update_ipv4 (struct prefix p, struct rib rib)
	234	{
	235	kernel_delete_ipv4 (p, rib);
	236	return kernel_add_ipv4 (p, rib);
	237	}
	238
718e3744	239	int
	240	kernel_delete_ipv4 (struct prefix p, struct rib rib)
	241	{
edd7c245	242	int route;
	243
	244	if (zserv_privs.change(ZPRIVS_RAISE))
	245	zlog (NULL, LOG_ERR, "Can't raise privileges");
	246	route = kernel_rtm_ipv4 (RTM_DELETE, p, rib, AF_INET);
	247	if (zserv_privs.change(ZPRIVS_LOWER))
	248	zlog (NULL, LOG_ERR, "Can't lower privileges");
	249
	250	return route;
718e3744	251	}
	252
	253	#ifdef HAVE_IPV6
	254
746c4f02	255	#ifdef SIN6_LEN
718e3744	256	/* Calculate sin6_len value for netmask socket value. */
6621ca86	257	static int
718e3744	258	sin6_masklen (struct in6_addr mask)
	259	{
	260	struct sockaddr_in6 sin6;
	261	char p, lim;
	262	int len;
	263
718e3744	264	if (IN6_IS_ADDR_UNSPECIFIED (&mask))
718e3744	265	return sizeof (long);
718e3744	266
	267	sin6.sin6_addr = mask;
	268	len = sizeof (struct sockaddr_in6);
	269
	270	lim = (char *) & sin6.sin6_addr;
	271	p = lim + sizeof (sin6.sin6_addr);
	272
	273	while (*--p == 0 && p >= lim)
	274	len--;
	275
	276	return len;
	277	}
746c4f02	278	#endif /* SIN6_LEN */
718e3744	279
718e3744	280	/* Interface between zebra message and rtm message. */
6621ca86	281	static int
718e3744	282	kernel_rtm_ipv6_multipath (int cmd, struct prefix p, struct rib rib,
	283	int family)
	284	{
	285	struct sockaddr_in6 *mask;
	286	struct sockaddr_in6 sin_dest, sin_mask, sin_gate;
fa713d9e CF	287	struct nexthop nexthop, tnexthop;
fa713d9e CF	288	int recursing;
718e3744	289	int nexthop_num = 0;
b892f1dd	290	ifindex_t ifindex = 0;
718e3744	291	int gate = 0;
	292	int error;
	293
	294	memset (&sin_dest, 0, sizeof (struct sockaddr_in6));
	295	sin_dest.sin6_family = AF_INET6;
	296	#ifdef SIN6_LEN
	297	sin_dest.sin6_len = sizeof (struct sockaddr_in6);
	298	#endif /* SIN6_LEN */
	299	sin_dest.sin6_addr = p->u.prefix6;
	300
	301	memset (&sin_mask, 0, sizeof (struct sockaddr_in6));
	302
	303	memset (&sin_gate, 0, sizeof (struct sockaddr_in6));
	304	sin_gate.sin6_family = AF_INET6;
6f0e3f6e	305	#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
718e3744	306	sin_gate.sin6_len = sizeof (struct sockaddr_in6);
6f0e3f6e	307	#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
718e3744	308
718e3744	309	/* Make gateway. */
fa713d9e	310	for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
718e3744	311	{
fa713d9e CF	312	if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
	313	continue;
	314
718e3744	315	gate = 0;
	316
	317	if ((cmd == RTM_ADD
	318	&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
	319	\|\| (cmd == RTM_DELETE
	320	#if 0
	321	&& CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)
	322	#endif
	323	))
	324	{
fa713d9e	325	if (nexthop->type == NEXTHOP_TYPE_IPV6
fa713d9e	326	\|\| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
718e3744	327	{
fa713d9e CF	328	sin_gate.sin6_addr = nexthop->gate.ipv6;
fa713d9e CF	329	gate = 1;
718e3744	330	}
fa713d9e	331	if (nexthop->type == NEXTHOP_TYPE_IFINDEX
fa713d9e CF	332	\|\| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
fa713d9e CF	333	ifindex = nexthop->ifindex;
718e3744	334
	335	if (cmd == RTM_ADD)
	336	SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
	337	}
	338
	339	/* Under kame set interface index to link local address. */
	340	#ifdef KAME
	341
	342	#define SET_IN6_LINKLOCAL_IFINDEX(a, i) \
	343	do { \
	344	(a).s6_addr[2] = ((i) >> 8) & 0xff; \
	345	(a).s6_addr[3] = (i) & 0xff; \
	346	} while (0)
	347
	348	if (gate && IN6_IS_ADDR_LINKLOCAL(&sin_gate.sin6_addr))
	349	SET_IN6_LINKLOCAL_IFINDEX (sin_gate.sin6_addr, ifindex);
	350	#endif /* KAME */
	351
	352	if (gate && p->prefixlen == 128)
	353	mask = NULL;
	354	else
	355	{
	356	masklen2ip6 (p->prefixlen, &sin_mask.sin6_addr);
6fe70d1b	357	sin_mask.sin6_family = AF_INET6;
718e3744	358	#ifdef SIN6_LEN
	359	sin_mask.sin6_len = sin6_masklen (sin_mask.sin6_addr);
	360	#endif /* SIN6_LEN */
	361	mask = &sin_mask;
	362	}
	363
	364	error = rtm_write (cmd,
	365	(union sockunion *) &sin_dest,
	366	(union sockunion *) mask,
	367	gate ? (union sockunion *)&sin_gate : NULL,
	368	ifindex,
	369	rib->flags,
	370	rib->metric);
	371
	372	#if 0
	373	if (error)
	374	{
	375	zlog_info ("kernel_rtm_ipv6_multipath(): nexthop %d add error=%d.",
	376	nexthop_num, error);
	377	}
746c4f02 DL	378	#else
746c4f02 DL	379	(void)error;
718e3744	380	#endif
	381
	382	nexthop_num++;
	383	}
	384
	385	/* If there is no useful nexthop then return. */
	386	if (nexthop_num == 0)
	387	{
	388	if (IS_ZEBRA_DEBUG_KERNEL)
b6178002	389	zlog_debug ("kernel_rtm_ipv6_multipath(): No useful nexthop.");
718e3744	390	return 0;
	391	}
	392
	393	return 0; /XXX/
	394	}
	395
	396	int
	397	kernel_add_ipv6 (struct prefix p, struct rib rib)
	398	{
edd7c245	399	int route;
	400
	401	if (zserv_privs.change(ZPRIVS_RAISE))
	402	zlog (NULL, LOG_ERR, "Can't raise privileges");
	403	route = kernel_rtm_ipv6_multipath (RTM_ADD, p, rib, AF_INET6);
	404	if (zserv_privs.change(ZPRIVS_LOWER))
	405	zlog (NULL, LOG_ERR, "Can't lower privileges");
	406
	407	return route;
718e3744	408	}
718e3744	409
dccc5225	410	int
	411	kernel_update_ipv6 (struct prefix p, struct rib rib)
	412	{
	413	kernel_delete_ipv6 (p, rib);
	414	return kernel_add_ipv6 (p, rib);
	415	}
	416
718e3744	417	int
	418	kernel_delete_ipv6 (struct prefix p, struct rib rib)
	419	{
edd7c245	420	int route;
	421
	422	if (zserv_privs.change(ZPRIVS_RAISE))
	423	zlog (NULL, LOG_ERR, "Can't raise privileges");
	424	route = kernel_rtm_ipv6_multipath (RTM_DELETE, p, rib, AF_INET6);
	425	if (zserv_privs.change(ZPRIVS_LOWER))
	426	zlog (NULL, LOG_ERR, "Can't lower privileges");
	427
	428	return route;
718e3744	429	}
718e3744	430	#endif /* HAVE_IPV6 */
6b8a5694 RW	431
	432	int
	433	kernel_neigh_update (int add, int ifindex, uint32_t addr, char *lla, int llalen)
	434	{
	435	/* TODO */
	436	return 0;
	437	}