summaryrefslogtreecommitdiff
path: root/zebra/rt_socket.c
blob: 0182fbd682860036bee7938c3492f73a7cdfc36b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
/*
 * 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"

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);

/* 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;
}

/* 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;
  int nexthop_num = 0;
  unsigned int ifindex = 0;
  int gate = 0;
  int error;

  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 (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
    {
      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 (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
	    {
	      if (nexthop->rtype == NEXTHOP_TYPE_IPV4 ||
		  nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX)
		{
		  sin_gate.sin_addr = nexthop->rgate.ipv4;
		  gate = 1;
		}
	      if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
		  || nexthop->rtype == NEXTHOP_TYPE_IFNAME
		  || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX)
		ifindex = nexthop->rifindex;
	    }
	  else
	    {
	      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_IFNAME
		  || 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 (cmd == RTM_ADD)
	    SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);

	  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 0
      if (error)
	{
	  zlog_info ("kernel_rtm_ipv4(): nexthop %d add error=%d.",
	    nexthop_num, 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_ipv4(): No useful nexthop.");
      return 0;
    }

  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_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

/* 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 defined (INRIA)
  if (IN_ANYADDR6 (mask)) 
    return sizeof (long);
#else /* ! INRIA */
  if (IN6_IS_ADDR_UNSPECIFIED (&mask)) 
    return sizeof (long);
#endif /* ! INRIA */

  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;
}

/* Interface between zebra message and rtm message. */
static int
kernel_rtm_ipv6 (int message, struct prefix_ipv6 *dest,
		 struct in6_addr *gate, int index, int flags)
{
  struct sockaddr_in6 *mask;
  struct sockaddr_in6 sin_dest, sin_mask, sin_gate;

  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 */

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

  memset (&sin_gate, 0, sizeof (struct sockaddr_in6));
  sin_gate.sin6_family = AF_INET6;
#ifdef SIN6_LEN
  sin_gate.sin6_len = sizeof (struct sockaddr_in6);
#endif /* SIN6_LEN */

  sin_dest.sin6_addr = dest->prefix;

  if (gate)
    memcpy (&sin_gate.sin6_addr, gate, sizeof (struct in6_addr));

  /* 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(gate))
    SET_IN6_LINKLOCAL_IFINDEX (sin_gate.sin6_addr, index);
#endif /* KAME */

  if (gate && dest->prefixlen == 128)
    mask = NULL;
  else
    {
      masklen2ip6 (dest->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;
    }

  return rtm_write (message, 
		    (union sockunion *) &sin_dest,
		    (union sockunion *) mask,
		    gate ? (union sockunion *)&sin_gate : NULL,
		    index,
		    flags,
		    0);
}

/* 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;
  int nexthop_num = 0;
  unsigned int 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 (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
    {
      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 (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
	    {
	      if (nexthop->rtype == NEXTHOP_TYPE_IPV6
		  || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
		  || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
		{
		  sin_gate.sin6_addr = nexthop->rgate.ipv6;
		  gate = 1;
		}
	      if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
		  || nexthop->rtype == NEXTHOP_TYPE_IFNAME
		  || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
		  || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
		ifindex = nexthop->rifindex;
	    }
	  else
	    {
	      if (nexthop->type == NEXTHOP_TYPE_IPV6
		  || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
		  || 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_IFNAME
		  || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
		  || 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);
	}
#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_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;
}

/* Delete IPv6 route from the kernel. */
int
kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate,
 		        unsigned int index, int flags, int table)
{
  int route;

  if (zserv_privs.change(ZPRIVS_RAISE))
    zlog (NULL, LOG_ERR, "Can't raise privileges");
  route = kernel_rtm_ipv6 (RTM_DELETE, dest, gate, index, flags);
  if (zserv_privs.change(ZPRIVS_LOWER))
    zlog (NULL, LOG_ERR, "Can't lower privileges");

  return route;
}
#endif /* HAVE_IPV6 */