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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
3 * Patrick Schaaf <bof@bof.de>
4 * Martin Josefsson <gandalf@wlug.westbo.se>
5 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@netfilter.org>
6 */
7
8/* Kernel module which implements the set match and SET target
9 * for netfilter/iptables.
10 */
11
12#include <linux/module.h>
13#include <linux/skbuff.h>
14
15#include <linux/netfilter/x_tables.h>
16#include <linux/netfilter/ipset/ip_set.h>
17#include <uapi/linux/netfilter/xt_set.h>
18
19MODULE_LICENSE("GPL");
20MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@netfilter.org>");
21MODULE_DESCRIPTION("Xtables: IP set match and target module");
22MODULE_ALIAS("xt_SET");
23MODULE_ALIAS("ipt_set");
24MODULE_ALIAS("ip6t_set");
25MODULE_ALIAS("ipt_SET");
26MODULE_ALIAS("ip6t_SET");
27
28static inline int
29match_set(ip_set_id_t index, const struct sk_buff *skb,
30 const struct xt_action_param *par,
31 struct ip_set_adt_opt *opt, int inv)
32{
33 if (ip_set_test(index, skb, par, opt))
34 inv = !inv;
35 return inv;
36}
37
38#define ADT_OPT(n, f, d, fs, cfs, t, p, b, po, bo) \
39struct ip_set_adt_opt n = { \
40 .family = f, \
41 .dim = d, \
42 .flags = fs, \
43 .cmdflags = cfs, \
44 .ext.timeout = t, \
45 .ext.packets = p, \
46 .ext.bytes = b, \
47 .ext.packets_op = po, \
48 .ext.bytes_op = bo, \
49}
50
51/* Revision 0 interface: backward compatible with netfilter/iptables */
52
53static bool
54set_match_v0(const struct sk_buff *skb, struct xt_action_param *par)
55{
56 const struct xt_set_info_match_v0 *info = par->matchinfo;
57
58 ADT_OPT(opt, xt_family(par), info->match_set.u.compat.dim,
59 info->match_set.u.compat.flags, 0, UINT_MAX,
60 0, 0, 0, 0);
61
62 return match_set(info->match_set.index, skb, par, &opt,
63 info->match_set.u.compat.flags & IPSET_INV_MATCH);
64}
65
66static void
67compat_flags(struct xt_set_info_v0 *info)
68{
69 u_int8_t i;
70
71 /* Fill out compatibility data according to enum ip_set_kopt */
72 info->u.compat.dim = IPSET_DIM_ZERO;
73 if (info->u.flags[0] & IPSET_MATCH_INV)
74 info->u.compat.flags |= IPSET_INV_MATCH;
75 for (i = 0; i < IPSET_DIM_MAX - 1 && info->u.flags[i]; i++) {
76 info->u.compat.dim++;
77 if (info->u.flags[i] & IPSET_SRC)
78 info->u.compat.flags |= (1 << info->u.compat.dim);
79 }
80}
81
82static int
83set_match_v0_checkentry(const struct xt_mtchk_param *par)
84{
85 struct xt_set_info_match_v0 *info = par->matchinfo;
86 ip_set_id_t index;
87
88 index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
89
90 if (index == IPSET_INVALID_ID) {
91 pr_info_ratelimited("Cannot find set identified by id %u to match\n",
92 info->match_set.index);
93 return -ENOENT;
94 }
95 if (info->match_set.u.flags[IPSET_DIM_MAX - 1] != 0) {
96 pr_info_ratelimited("set match dimension is over the limit!\n");
97 ip_set_nfnl_put(par->net, info->match_set.index);
98 return -ERANGE;
99 }
100
101 /* Fill out compatibility data */
102 compat_flags(&info->match_set);
103
104 return 0;
105}
106
107static void
108set_match_v0_destroy(const struct xt_mtdtor_param *par)
109{
110 struct xt_set_info_match_v0 *info = par->matchinfo;
111
112 ip_set_nfnl_put(par->net, info->match_set.index);
113}
114
115/* Revision 1 match */
116
117static bool
118set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
119{
120 const struct xt_set_info_match_v1 *info = par->matchinfo;
121
122 ADT_OPT(opt, xt_family(par), info->match_set.dim,
123 info->match_set.flags, 0, UINT_MAX,
124 0, 0, 0, 0);
125
126 if (opt.flags & IPSET_RETURN_NOMATCH)
127 opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;
128
129 return match_set(info->match_set.index, skb, par, &opt,
130 info->match_set.flags & IPSET_INV_MATCH);
131}
132
133static int
134set_match_v1_checkentry(const struct xt_mtchk_param *par)
135{
136 struct xt_set_info_match_v1 *info = par->matchinfo;
137 ip_set_id_t index;
138
139 index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
140
141 if (index == IPSET_INVALID_ID) {
142 pr_info_ratelimited("Cannot find set identified by id %u to match\n",
143 info->match_set.index);
144 return -ENOENT;
145 }
146 if (info->match_set.dim > IPSET_DIM_MAX) {
147 pr_info_ratelimited("set match dimension is over the limit!\n");
148 ip_set_nfnl_put(par->net, info->match_set.index);
149 return -ERANGE;
150 }
151
152 return 0;
153}
154
155static void
156set_match_v1_destroy(const struct xt_mtdtor_param *par)
157{
158 struct xt_set_info_match_v1 *info = par->matchinfo;
159
160 ip_set_nfnl_put(par->net, info->match_set.index);
161}
162
163/* Revision 3 match */
164
165static bool
166set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
167{
168 const struct xt_set_info_match_v3 *info = par->matchinfo;
169
170 ADT_OPT(opt, xt_family(par), info->match_set.dim,
171 info->match_set.flags, info->flags, UINT_MAX,
172 info->packets.value, info->bytes.value,
173 info->packets.op, info->bytes.op);
174
175 if (info->packets.op != IPSET_COUNTER_NONE ||
176 info->bytes.op != IPSET_COUNTER_NONE)
177 opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
178
179 return match_set(info->match_set.index, skb, par, &opt,
180 info->match_set.flags & IPSET_INV_MATCH);
181}
182
183#define set_match_v3_checkentry set_match_v1_checkentry
184#define set_match_v3_destroy set_match_v1_destroy
185
186/* Revision 4 match */
187
188static bool
189set_match_v4(const struct sk_buff *skb, struct xt_action_param *par)
190{
191 const struct xt_set_info_match_v4 *info = par->matchinfo;
192
193 ADT_OPT(opt, xt_family(par), info->match_set.dim,
194 info->match_set.flags, info->flags, UINT_MAX,
195 info->packets.value, info->bytes.value,
196 info->packets.op, info->bytes.op);
197
198 if (info->packets.op != IPSET_COUNTER_NONE ||
199 info->bytes.op != IPSET_COUNTER_NONE)
200 opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
201
202 return match_set(info->match_set.index, skb, par, &opt,
203 info->match_set.flags & IPSET_INV_MATCH);
204}
205
206#define set_match_v4_checkentry set_match_v1_checkentry
207#define set_match_v4_destroy set_match_v1_destroy
208
209/* Revision 0 interface: backward compatible with netfilter/iptables */
210
211static unsigned int
212set_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
213{
214 const struct xt_set_info_target_v0 *info = par->targinfo;
215
216 ADT_OPT(add_opt, xt_family(par), info->add_set.u.compat.dim,
217 info->add_set.u.compat.flags, 0, UINT_MAX,
218 0, 0, 0, 0);
219 ADT_OPT(del_opt, xt_family(par), info->del_set.u.compat.dim,
220 info->del_set.u.compat.flags, 0, UINT_MAX,
221 0, 0, 0, 0);
222
223 if (info->add_set.index != IPSET_INVALID_ID)
224 ip_set_add(info->add_set.index, skb, par, &add_opt);
225 if (info->del_set.index != IPSET_INVALID_ID)
226 ip_set_del(info->del_set.index, skb, par, &del_opt);
227
228 return XT_CONTINUE;
229}
230
231static int
232set_target_v0_checkentry(const struct xt_tgchk_param *par)
233{
234 struct xt_set_info_target_v0 *info = par->targinfo;
235 ip_set_id_t index;
236
237 if (info->add_set.index != IPSET_INVALID_ID) {
238 index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
239 if (index == IPSET_INVALID_ID) {
240 pr_info_ratelimited("Cannot find add_set index %u as target\n",
241 info->add_set.index);
242 return -ENOENT;
243 }
244 }
245
246 if (info->del_set.index != IPSET_INVALID_ID) {
247 index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
248 if (index == IPSET_INVALID_ID) {
249 pr_info_ratelimited("Cannot find del_set index %u as target\n",
250 info->del_set.index);
251 if (info->add_set.index != IPSET_INVALID_ID)
252 ip_set_nfnl_put(par->net, info->add_set.index);
253 return -ENOENT;
254 }
255 }
256 if (info->add_set.u.flags[IPSET_DIM_MAX - 1] != 0 ||
257 info->del_set.u.flags[IPSET_DIM_MAX - 1] != 0) {
258 pr_info_ratelimited("SET target dimension over the limit!\n");
259 if (info->add_set.index != IPSET_INVALID_ID)
260 ip_set_nfnl_put(par->net, info->add_set.index);
261 if (info->del_set.index != IPSET_INVALID_ID)
262 ip_set_nfnl_put(par->net, info->del_set.index);
263 return -ERANGE;
264 }
265
266 /* Fill out compatibility data */
267 compat_flags(&info->add_set);
268 compat_flags(&info->del_set);
269
270 return 0;
271}
272
273static void
274set_target_v0_destroy(const struct xt_tgdtor_param *par)
275{
276 const struct xt_set_info_target_v0 *info = par->targinfo;
277
278 if (info->add_set.index != IPSET_INVALID_ID)
279 ip_set_nfnl_put(par->net, info->add_set.index);
280 if (info->del_set.index != IPSET_INVALID_ID)
281 ip_set_nfnl_put(par->net, info->del_set.index);
282}
283
284/* Revision 1 target */
285
286static unsigned int
287set_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
288{
289 const struct xt_set_info_target_v1 *info = par->targinfo;
290
291 ADT_OPT(add_opt, xt_family(par), info->add_set.dim,
292 info->add_set.flags, 0, UINT_MAX,
293 0, 0, 0, 0);
294 ADT_OPT(del_opt, xt_family(par), info->del_set.dim,
295 info->del_set.flags, 0, UINT_MAX,
296 0, 0, 0, 0);
297
298 if (info->add_set.index != IPSET_INVALID_ID)
299 ip_set_add(info->add_set.index, skb, par, &add_opt);
300 if (info->del_set.index != IPSET_INVALID_ID)
301 ip_set_del(info->del_set.index, skb, par, &del_opt);
302
303 return XT_CONTINUE;
304}
305
306static int
307set_target_v1_checkentry(const struct xt_tgchk_param *par)
308{
309 const struct xt_set_info_target_v1 *info = par->targinfo;
310 ip_set_id_t index;
311
312 if (info->add_set.index != IPSET_INVALID_ID) {
313 index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
314 if (index == IPSET_INVALID_ID) {
315 pr_info_ratelimited("Cannot find add_set index %u as target\n",
316 info->add_set.index);
317 return -ENOENT;
318 }
319 }
320
321 if (info->del_set.index != IPSET_INVALID_ID) {
322 index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
323 if (index == IPSET_INVALID_ID) {
324 pr_info_ratelimited("Cannot find del_set index %u as target\n",
325 info->del_set.index);
326 if (info->add_set.index != IPSET_INVALID_ID)
327 ip_set_nfnl_put(par->net, info->add_set.index);
328 return -ENOENT;
329 }
330 }
331 if (info->add_set.dim > IPSET_DIM_MAX ||
332 info->del_set.dim > IPSET_DIM_MAX) {
333 pr_info_ratelimited("SET target dimension over the limit!\n");
334 if (info->add_set.index != IPSET_INVALID_ID)
335 ip_set_nfnl_put(par->net, info->add_set.index);
336 if (info->del_set.index != IPSET_INVALID_ID)
337 ip_set_nfnl_put(par->net, info->del_set.index);
338 return -ERANGE;
339 }
340
341 return 0;
342}
343
344static void
345set_target_v1_destroy(const struct xt_tgdtor_param *par)
346{
347 const struct xt_set_info_target_v1 *info = par->targinfo;
348
349 if (info->add_set.index != IPSET_INVALID_ID)
350 ip_set_nfnl_put(par->net, info->add_set.index);
351 if (info->del_set.index != IPSET_INVALID_ID)
352 ip_set_nfnl_put(par->net, info->del_set.index);
353}
354
355/* Revision 2 target */
356
357static unsigned int
358set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
359{
360 const struct xt_set_info_target_v2 *info = par->targinfo;
361
362 ADT_OPT(add_opt, xt_family(par), info->add_set.dim,
363 info->add_set.flags, info->flags, info->timeout,
364 0, 0, 0, 0);
365 ADT_OPT(del_opt, xt_family(par), info->del_set.dim,
366 info->del_set.flags, 0, UINT_MAX,
367 0, 0, 0, 0);
368
369 /* Normalize to fit into jiffies */
370 if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
371 add_opt.ext.timeout > IPSET_MAX_TIMEOUT)
372 add_opt.ext.timeout = IPSET_MAX_TIMEOUT;
373 if (info->add_set.index != IPSET_INVALID_ID)
374 ip_set_add(info->add_set.index, skb, par, &add_opt);
375 if (info->del_set.index != IPSET_INVALID_ID)
376 ip_set_del(info->del_set.index, skb, par, &del_opt);
377
378 return XT_CONTINUE;
379}
380
381#define set_target_v2_checkentry set_target_v1_checkentry
382#define set_target_v2_destroy set_target_v1_destroy
383
384/* Revision 3 target */
385
386#define MOPT(opt, member) ((opt).ext.skbinfo.member)
387
388static unsigned int
389set_target_v3(struct sk_buff *skb, const struct xt_action_param *par)
390{
391 const struct xt_set_info_target_v3 *info = par->targinfo;
392 int ret;
393
394 ADT_OPT(add_opt, xt_family(par), info->add_set.dim,
395 info->add_set.flags, info->flags, info->timeout,
396 0, 0, 0, 0);
397 ADT_OPT(del_opt, xt_family(par), info->del_set.dim,
398 info->del_set.flags, 0, UINT_MAX,
399 0, 0, 0, 0);
400 ADT_OPT(map_opt, xt_family(par), info->map_set.dim,
401 info->map_set.flags, 0, UINT_MAX,
402 0, 0, 0, 0);
403
404 /* Normalize to fit into jiffies */
405 if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
406 add_opt.ext.timeout > IPSET_MAX_TIMEOUT)
407 add_opt.ext.timeout = IPSET_MAX_TIMEOUT;
408 if (info->add_set.index != IPSET_INVALID_ID)
409 ip_set_add(info->add_set.index, skb, par, &add_opt);
410 if (info->del_set.index != IPSET_INVALID_ID)
411 ip_set_del(info->del_set.index, skb, par, &del_opt);
412 if (info->map_set.index != IPSET_INVALID_ID) {
413 map_opt.cmdflags |= info->flags & (IPSET_FLAG_MAP_SKBMARK |
414 IPSET_FLAG_MAP_SKBPRIO |
415 IPSET_FLAG_MAP_SKBQUEUE);
416 ret = match_set(info->map_set.index, skb, par, &map_opt,
417 info->map_set.flags & IPSET_INV_MATCH);
418 if (!ret)
419 return XT_CONTINUE;
420 if (map_opt.cmdflags & IPSET_FLAG_MAP_SKBMARK)
421 skb->mark = (skb->mark & ~MOPT(map_opt,skbmarkmask))
422 ^ MOPT(map_opt, skbmark);
423 if (map_opt.cmdflags & IPSET_FLAG_MAP_SKBPRIO)
424 skb->priority = MOPT(map_opt, skbprio);
425 if ((map_opt.cmdflags & IPSET_FLAG_MAP_SKBQUEUE) &&
426 skb->dev &&
427 skb->dev->real_num_tx_queues > MOPT(map_opt, skbqueue))
428 skb_set_queue_mapping(skb, MOPT(map_opt, skbqueue));
429 }
430 return XT_CONTINUE;
431}
432
433static int
434set_target_v3_checkentry(const struct xt_tgchk_param *par)
435{
436 const struct xt_set_info_target_v3 *info = par->targinfo;
437 ip_set_id_t index;
438 int ret = 0;
439
440 if (info->add_set.index != IPSET_INVALID_ID) {
441 index = ip_set_nfnl_get_byindex(par->net,
442 info->add_set.index);
443 if (index == IPSET_INVALID_ID) {
444 pr_info_ratelimited("Cannot find add_set index %u as target\n",
445 info->add_set.index);
446 return -ENOENT;
447 }
448 }
449
450 if (info->del_set.index != IPSET_INVALID_ID) {
451 index = ip_set_nfnl_get_byindex(par->net,
452 info->del_set.index);
453 if (index == IPSET_INVALID_ID) {
454 pr_info_ratelimited("Cannot find del_set index %u as target\n",
455 info->del_set.index);
456 ret = -ENOENT;
457 goto cleanup_add;
458 }
459 }
460
461 if (info->map_set.index != IPSET_INVALID_ID) {
462 if (strncmp(par->table, "mangle", 7)) {
463 pr_info_ratelimited("--map-set only usable from mangle table\n");
464 ret = -EINVAL;
465 goto cleanup_del;
466 }
467 if (((info->flags & IPSET_FLAG_MAP_SKBPRIO) |
468 (info->flags & IPSET_FLAG_MAP_SKBQUEUE)) &&
469 (par->hook_mask & ~(1 << NF_INET_FORWARD |
470 1 << NF_INET_LOCAL_OUT |
471 1 << NF_INET_POST_ROUTING))) {
472 pr_info_ratelimited("mapping of prio or/and queue is allowed only from OUTPUT/FORWARD/POSTROUTING chains\n");
473 ret = -EINVAL;
474 goto cleanup_del;
475 }
476 index = ip_set_nfnl_get_byindex(par->net,
477 info->map_set.index);
478 if (index == IPSET_INVALID_ID) {
479 pr_info_ratelimited("Cannot find map_set index %u as target\n",
480 info->map_set.index);
481 ret = -ENOENT;
482 goto cleanup_del;
483 }
484 }
485
486 if (info->add_set.dim > IPSET_DIM_MAX ||
487 info->del_set.dim > IPSET_DIM_MAX ||
488 info->map_set.dim > IPSET_DIM_MAX) {
489 pr_info_ratelimited("SET target dimension over the limit!\n");
490 ret = -ERANGE;
491 goto cleanup_mark;
492 }
493
494 return 0;
495cleanup_mark:
496 if (info->map_set.index != IPSET_INVALID_ID)
497 ip_set_nfnl_put(par->net, info->map_set.index);
498cleanup_del:
499 if (info->del_set.index != IPSET_INVALID_ID)
500 ip_set_nfnl_put(par->net, info->del_set.index);
501cleanup_add:
502 if (info->add_set.index != IPSET_INVALID_ID)
503 ip_set_nfnl_put(par->net, info->add_set.index);
504 return ret;
505}
506
507static void
508set_target_v3_destroy(const struct xt_tgdtor_param *par)
509{
510 const struct xt_set_info_target_v3 *info = par->targinfo;
511
512 if (info->add_set.index != IPSET_INVALID_ID)
513 ip_set_nfnl_put(par->net, info->add_set.index);
514 if (info->del_set.index != IPSET_INVALID_ID)
515 ip_set_nfnl_put(par->net, info->del_set.index);
516 if (info->map_set.index != IPSET_INVALID_ID)
517 ip_set_nfnl_put(par->net, info->map_set.index);
518}
519
520static struct xt_match set_matches[] __read_mostly = {
521 {
522 .name = "set",
523 .family = NFPROTO_IPV4,
524 .revision = 0,
525 .match = set_match_v0,
526 .matchsize = sizeof(struct xt_set_info_match_v0),
527 .checkentry = set_match_v0_checkentry,
528 .destroy = set_match_v0_destroy,
529 .me = THIS_MODULE
530 },
531 {
532 .name = "set",
533 .family = NFPROTO_IPV4,
534 .revision = 1,
535 .match = set_match_v1,
536 .matchsize = sizeof(struct xt_set_info_match_v1),
537 .checkentry = set_match_v1_checkentry,
538 .destroy = set_match_v1_destroy,
539 .me = THIS_MODULE
540 },
541 {
542 .name = "set",
543 .family = NFPROTO_IPV6,
544 .revision = 1,
545 .match = set_match_v1,
546 .matchsize = sizeof(struct xt_set_info_match_v1),
547 .checkentry = set_match_v1_checkentry,
548 .destroy = set_match_v1_destroy,
549 .me = THIS_MODULE
550 },
551 /* --return-nomatch flag support */
552 {
553 .name = "set",
554 .family = NFPROTO_IPV4,
555 .revision = 2,
556 .match = set_match_v1,
557 .matchsize = sizeof(struct xt_set_info_match_v1),
558 .checkentry = set_match_v1_checkentry,
559 .destroy = set_match_v1_destroy,
560 .me = THIS_MODULE
561 },
562 {
563 .name = "set",
564 .family = NFPROTO_IPV6,
565 .revision = 2,
566 .match = set_match_v1,
567 .matchsize = sizeof(struct xt_set_info_match_v1),
568 .checkentry = set_match_v1_checkentry,
569 .destroy = set_match_v1_destroy,
570 .me = THIS_MODULE
571 },
572 /* counters support: update, match */
573 {
574 .name = "set",
575 .family = NFPROTO_IPV4,
576 .revision = 3,
577 .match = set_match_v3,
578 .matchsize = sizeof(struct xt_set_info_match_v3),
579 .checkentry = set_match_v3_checkentry,
580 .destroy = set_match_v3_destroy,
581 .me = THIS_MODULE
582 },
583 {
584 .name = "set",
585 .family = NFPROTO_IPV6,
586 .revision = 3,
587 .match = set_match_v3,
588 .matchsize = sizeof(struct xt_set_info_match_v3),
589 .checkentry = set_match_v3_checkentry,
590 .destroy = set_match_v3_destroy,
591 .me = THIS_MODULE
592 },
593 /* new revision for counters support: update, match */
594 {
595 .name = "set",
596 .family = NFPROTO_IPV4,
597 .revision = 4,
598 .match = set_match_v4,
599 .matchsize = sizeof(struct xt_set_info_match_v4),
600 .checkentry = set_match_v4_checkentry,
601 .destroy = set_match_v4_destroy,
602 .me = THIS_MODULE
603 },
604 {
605 .name = "set",
606 .family = NFPROTO_IPV6,
607 .revision = 4,
608 .match = set_match_v4,
609 .matchsize = sizeof(struct xt_set_info_match_v4),
610 .checkentry = set_match_v4_checkentry,
611 .destroy = set_match_v4_destroy,
612 .me = THIS_MODULE
613 },
614};
615
616static struct xt_target set_targets[] __read_mostly = {
617 {
618 .name = "SET",
619 .revision = 0,
620 .family = NFPROTO_IPV4,
621 .target = set_target_v0,
622 .targetsize = sizeof(struct xt_set_info_target_v0),
623 .checkentry = set_target_v0_checkentry,
624 .destroy = set_target_v0_destroy,
625 .me = THIS_MODULE
626 },
627 {
628 .name = "SET",
629 .revision = 1,
630 .family = NFPROTO_IPV4,
631 .target = set_target_v1,
632 .targetsize = sizeof(struct xt_set_info_target_v1),
633 .checkentry = set_target_v1_checkentry,
634 .destroy = set_target_v1_destroy,
635 .me = THIS_MODULE
636 },
637 {
638 .name = "SET",
639 .revision = 1,
640 .family = NFPROTO_IPV6,
641 .target = set_target_v1,
642 .targetsize = sizeof(struct xt_set_info_target_v1),
643 .checkentry = set_target_v1_checkentry,
644 .destroy = set_target_v1_destroy,
645 .me = THIS_MODULE
646 },
647 /* --timeout and --exist flags support */
648 {
649 .name = "SET",
650 .revision = 2,
651 .family = NFPROTO_IPV4,
652 .target = set_target_v2,
653 .targetsize = sizeof(struct xt_set_info_target_v2),
654 .checkentry = set_target_v2_checkentry,
655 .destroy = set_target_v2_destroy,
656 .me = THIS_MODULE
657 },
658 {
659 .name = "SET",
660 .revision = 2,
661 .family = NFPROTO_IPV6,
662 .target = set_target_v2,
663 .targetsize = sizeof(struct xt_set_info_target_v2),
664 .checkentry = set_target_v2_checkentry,
665 .destroy = set_target_v2_destroy,
666 .me = THIS_MODULE
667 },
668 /* --map-set support */
669 {
670 .name = "SET",
671 .revision = 3,
672 .family = NFPROTO_IPV4,
673 .target = set_target_v3,
674 .targetsize = sizeof(struct xt_set_info_target_v3),
675 .checkentry = set_target_v3_checkentry,
676 .destroy = set_target_v3_destroy,
677 .me = THIS_MODULE
678 },
679 {
680 .name = "SET",
681 .revision = 3,
682 .family = NFPROTO_IPV6,
683 .target = set_target_v3,
684 .targetsize = sizeof(struct xt_set_info_target_v3),
685 .checkentry = set_target_v3_checkentry,
686 .destroy = set_target_v3_destroy,
687 .me = THIS_MODULE
688 },
689};
690
691static int __init xt_set_init(void)
692{
693 int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));
694
695 if (!ret) {
696 ret = xt_register_targets(set_targets,
697 ARRAY_SIZE(set_targets));
698 if (ret)
699 xt_unregister_matches(set_matches,
700 ARRAY_SIZE(set_matches));
701 }
702 return ret;
703}
704
705static void __exit xt_set_fini(void)
706{
707 xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
708 xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
709}
710
711module_init(xt_set_init);
712module_exit(xt_set_fini);
1/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
2 * Patrick Schaaf <bof@bof.de>
3 * Martin Josefsson <gandalf@wlug.westbo.se>
4 * Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11/* Kernel module which implements the set match and SET target
12 * for netfilter/iptables. */
13
14#include <linux/module.h>
15#include <linux/skbuff.h>
16
17#include <linux/netfilter/x_tables.h>
18#include <linux/netfilter/xt_set.h>
19#include <linux/netfilter/ipset/ip_set_timeout.h>
20
21MODULE_LICENSE("GPL");
22MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
23MODULE_DESCRIPTION("Xtables: IP set match and target module");
24MODULE_ALIAS("xt_SET");
25MODULE_ALIAS("ipt_set");
26MODULE_ALIAS("ip6t_set");
27MODULE_ALIAS("ipt_SET");
28MODULE_ALIAS("ip6t_SET");
29
30static inline int
31match_set(ip_set_id_t index, const struct sk_buff *skb,
32 const struct xt_action_param *par,
33 struct ip_set_adt_opt *opt, int inv)
34{
35 if (ip_set_test(index, skb, par, opt))
36 inv = !inv;
37 return inv;
38}
39
40#define ADT_OPT(n, f, d, fs, cfs, t) \
41struct ip_set_adt_opt n = { \
42 .family = f, \
43 .dim = d, \
44 .flags = fs, \
45 .cmdflags = cfs, \
46 .ext.timeout = t, \
47}
48
49/* Revision 0 interface: backward compatible with netfilter/iptables */
50
51static bool
52set_match_v0(const struct sk_buff *skb, struct xt_action_param *par)
53{
54 const struct xt_set_info_match_v0 *info = par->matchinfo;
55 ADT_OPT(opt, par->family, info->match_set.u.compat.dim,
56 info->match_set.u.compat.flags, 0, UINT_MAX);
57
58 return match_set(info->match_set.index, skb, par, &opt,
59 info->match_set.u.compat.flags & IPSET_INV_MATCH);
60}
61
62static void
63compat_flags(struct xt_set_info_v0 *info)
64{
65 u_int8_t i;
66
67 /* Fill out compatibility data according to enum ip_set_kopt */
68 info->u.compat.dim = IPSET_DIM_ZERO;
69 if (info->u.flags[0] & IPSET_MATCH_INV)
70 info->u.compat.flags |= IPSET_INV_MATCH;
71 for (i = 0; i < IPSET_DIM_MAX-1 && info->u.flags[i]; i++) {
72 info->u.compat.dim++;
73 if (info->u.flags[i] & IPSET_SRC)
74 info->u.compat.flags |= (1<<info->u.compat.dim);
75 }
76}
77
78static int
79set_match_v0_checkentry(const struct xt_mtchk_param *par)
80{
81 struct xt_set_info_match_v0 *info = par->matchinfo;
82 ip_set_id_t index;
83
84 index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
85
86 if (index == IPSET_INVALID_ID) {
87 pr_warning("Cannot find set identified by id %u to match\n",
88 info->match_set.index);
89 return -ENOENT;
90 }
91 if (info->match_set.u.flags[IPSET_DIM_MAX-1] != 0) {
92 pr_warning("Protocol error: set match dimension "
93 "is over the limit!\n");
94 ip_set_nfnl_put(par->net, info->match_set.index);
95 return -ERANGE;
96 }
97
98 /* Fill out compatibility data */
99 compat_flags(&info->match_set);
100
101 return 0;
102}
103
104static void
105set_match_v0_destroy(const struct xt_mtdtor_param *par)
106{
107 struct xt_set_info_match_v0 *info = par->matchinfo;
108
109 ip_set_nfnl_put(par->net, info->match_set.index);
110}
111
112/* Revision 1 match */
113
114static bool
115set_match_v1(const struct sk_buff *skb, struct xt_action_param *par)
116{
117 const struct xt_set_info_match_v1 *info = par->matchinfo;
118 ADT_OPT(opt, par->family, info->match_set.dim,
119 info->match_set.flags, 0, UINT_MAX);
120
121 if (opt.flags & IPSET_RETURN_NOMATCH)
122 opt.cmdflags |= IPSET_FLAG_RETURN_NOMATCH;
123
124 return match_set(info->match_set.index, skb, par, &opt,
125 info->match_set.flags & IPSET_INV_MATCH);
126}
127
128static int
129set_match_v1_checkentry(const struct xt_mtchk_param *par)
130{
131 struct xt_set_info_match_v1 *info = par->matchinfo;
132 ip_set_id_t index;
133
134 index = ip_set_nfnl_get_byindex(par->net, info->match_set.index);
135
136 if (index == IPSET_INVALID_ID) {
137 pr_warning("Cannot find set identified by id %u to match\n",
138 info->match_set.index);
139 return -ENOENT;
140 }
141 if (info->match_set.dim > IPSET_DIM_MAX) {
142 pr_warning("Protocol error: set match dimension "
143 "is over the limit!\n");
144 ip_set_nfnl_put(par->net, info->match_set.index);
145 return -ERANGE;
146 }
147
148 return 0;
149}
150
151static void
152set_match_v1_destroy(const struct xt_mtdtor_param *par)
153{
154 struct xt_set_info_match_v1 *info = par->matchinfo;
155
156 ip_set_nfnl_put(par->net, info->match_set.index);
157}
158
159/* Revision 3 match */
160
161static bool
162match_counter(u64 counter, const struct ip_set_counter_match *info)
163{
164 switch (info->op) {
165 case IPSET_COUNTER_NONE:
166 return true;
167 case IPSET_COUNTER_EQ:
168 return counter == info->value;
169 case IPSET_COUNTER_NE:
170 return counter != info->value;
171 case IPSET_COUNTER_LT:
172 return counter < info->value;
173 case IPSET_COUNTER_GT:
174 return counter > info->value;
175 }
176 return false;
177}
178
179static bool
180set_match_v3(const struct sk_buff *skb, struct xt_action_param *par)
181{
182 const struct xt_set_info_match_v3 *info = par->matchinfo;
183 ADT_OPT(opt, par->family, info->match_set.dim,
184 info->match_set.flags, info->flags, UINT_MAX);
185 int ret;
186
187 if (info->packets.op != IPSET_COUNTER_NONE ||
188 info->bytes.op != IPSET_COUNTER_NONE)
189 opt.cmdflags |= IPSET_FLAG_MATCH_COUNTERS;
190
191 ret = match_set(info->match_set.index, skb, par, &opt,
192 info->match_set.flags & IPSET_INV_MATCH);
193
194 if (!(ret && opt.cmdflags & IPSET_FLAG_MATCH_COUNTERS))
195 return ret;
196
197 if (!match_counter(opt.ext.packets, &info->packets))
198 return 0;
199 return match_counter(opt.ext.bytes, &info->bytes);
200}
201
202#define set_match_v3_checkentry set_match_v1_checkentry
203#define set_match_v3_destroy set_match_v1_destroy
204
205/* Revision 0 interface: backward compatible with netfilter/iptables */
206
207static unsigned int
208set_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
209{
210 const struct xt_set_info_target_v0 *info = par->targinfo;
211 ADT_OPT(add_opt, par->family, info->add_set.u.compat.dim,
212 info->add_set.u.compat.flags, 0, UINT_MAX);
213 ADT_OPT(del_opt, par->family, info->del_set.u.compat.dim,
214 info->del_set.u.compat.flags, 0, UINT_MAX);
215
216 if (info->add_set.index != IPSET_INVALID_ID)
217 ip_set_add(info->add_set.index, skb, par, &add_opt);
218 if (info->del_set.index != IPSET_INVALID_ID)
219 ip_set_del(info->del_set.index, skb, par, &del_opt);
220
221 return XT_CONTINUE;
222}
223
224static int
225set_target_v0_checkentry(const struct xt_tgchk_param *par)
226{
227 struct xt_set_info_target_v0 *info = par->targinfo;
228 ip_set_id_t index;
229
230 if (info->add_set.index != IPSET_INVALID_ID) {
231 index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
232 if (index == IPSET_INVALID_ID) {
233 pr_warning("Cannot find add_set index %u as target\n",
234 info->add_set.index);
235 return -ENOENT;
236 }
237 }
238
239 if (info->del_set.index != IPSET_INVALID_ID) {
240 index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
241 if (index == IPSET_INVALID_ID) {
242 pr_warning("Cannot find del_set index %u as target\n",
243 info->del_set.index);
244 if (info->add_set.index != IPSET_INVALID_ID)
245 ip_set_nfnl_put(par->net, info->add_set.index);
246 return -ENOENT;
247 }
248 }
249 if (info->add_set.u.flags[IPSET_DIM_MAX-1] != 0 ||
250 info->del_set.u.flags[IPSET_DIM_MAX-1] != 0) {
251 pr_warning("Protocol error: SET target dimension "
252 "is over the limit!\n");
253 if (info->add_set.index != IPSET_INVALID_ID)
254 ip_set_nfnl_put(par->net, info->add_set.index);
255 if (info->del_set.index != IPSET_INVALID_ID)
256 ip_set_nfnl_put(par->net, info->del_set.index);
257 return -ERANGE;
258 }
259
260 /* Fill out compatibility data */
261 compat_flags(&info->add_set);
262 compat_flags(&info->del_set);
263
264 return 0;
265}
266
267static void
268set_target_v0_destroy(const struct xt_tgdtor_param *par)
269{
270 const struct xt_set_info_target_v0 *info = par->targinfo;
271
272 if (info->add_set.index != IPSET_INVALID_ID)
273 ip_set_nfnl_put(par->net, info->add_set.index);
274 if (info->del_set.index != IPSET_INVALID_ID)
275 ip_set_nfnl_put(par->net, info->del_set.index);
276}
277
278/* Revision 1 target */
279
280static unsigned int
281set_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
282{
283 const struct xt_set_info_target_v1 *info = par->targinfo;
284 ADT_OPT(add_opt, par->family, info->add_set.dim,
285 info->add_set.flags, 0, UINT_MAX);
286 ADT_OPT(del_opt, par->family, info->del_set.dim,
287 info->del_set.flags, 0, UINT_MAX);
288
289 if (info->add_set.index != IPSET_INVALID_ID)
290 ip_set_add(info->add_set.index, skb, par, &add_opt);
291 if (info->del_set.index != IPSET_INVALID_ID)
292 ip_set_del(info->del_set.index, skb, par, &del_opt);
293
294 return XT_CONTINUE;
295}
296
297static int
298set_target_v1_checkentry(const struct xt_tgchk_param *par)
299{
300 const struct xt_set_info_target_v1 *info = par->targinfo;
301 ip_set_id_t index;
302
303 if (info->add_set.index != IPSET_INVALID_ID) {
304 index = ip_set_nfnl_get_byindex(par->net, info->add_set.index);
305 if (index == IPSET_INVALID_ID) {
306 pr_warning("Cannot find add_set index %u as target\n",
307 info->add_set.index);
308 return -ENOENT;
309 }
310 }
311
312 if (info->del_set.index != IPSET_INVALID_ID) {
313 index = ip_set_nfnl_get_byindex(par->net, info->del_set.index);
314 if (index == IPSET_INVALID_ID) {
315 pr_warning("Cannot find del_set index %u as target\n",
316 info->del_set.index);
317 if (info->add_set.index != IPSET_INVALID_ID)
318 ip_set_nfnl_put(par->net, info->add_set.index);
319 return -ENOENT;
320 }
321 }
322 if (info->add_set.dim > IPSET_DIM_MAX ||
323 info->del_set.dim > IPSET_DIM_MAX) {
324 pr_warning("Protocol error: SET target dimension "
325 "is over the limit!\n");
326 if (info->add_set.index != IPSET_INVALID_ID)
327 ip_set_nfnl_put(par->net, info->add_set.index);
328 if (info->del_set.index != IPSET_INVALID_ID)
329 ip_set_nfnl_put(par->net, info->del_set.index);
330 return -ERANGE;
331 }
332
333 return 0;
334}
335
336static void
337set_target_v1_destroy(const struct xt_tgdtor_param *par)
338{
339 const struct xt_set_info_target_v1 *info = par->targinfo;
340
341 if (info->add_set.index != IPSET_INVALID_ID)
342 ip_set_nfnl_put(par->net, info->add_set.index);
343 if (info->del_set.index != IPSET_INVALID_ID)
344 ip_set_nfnl_put(par->net, info->del_set.index);
345}
346
347/* Revision 2 target */
348
349static unsigned int
350set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
351{
352 const struct xt_set_info_target_v2 *info = par->targinfo;
353 ADT_OPT(add_opt, par->family, info->add_set.dim,
354 info->add_set.flags, info->flags, info->timeout);
355 ADT_OPT(del_opt, par->family, info->del_set.dim,
356 info->del_set.flags, 0, UINT_MAX);
357
358 /* Normalize to fit into jiffies */
359 if (add_opt.ext.timeout != IPSET_NO_TIMEOUT &&
360 add_opt.ext.timeout > UINT_MAX/MSEC_PER_SEC)
361 add_opt.ext.timeout = UINT_MAX/MSEC_PER_SEC;
362 if (info->add_set.index != IPSET_INVALID_ID)
363 ip_set_add(info->add_set.index, skb, par, &add_opt);
364 if (info->del_set.index != IPSET_INVALID_ID)
365 ip_set_del(info->del_set.index, skb, par, &del_opt);
366
367 return XT_CONTINUE;
368}
369
370#define set_target_v2_checkentry set_target_v1_checkentry
371#define set_target_v2_destroy set_target_v1_destroy
372
373static struct xt_match set_matches[] __read_mostly = {
374 {
375 .name = "set",
376 .family = NFPROTO_IPV4,
377 .revision = 0,
378 .match = set_match_v0,
379 .matchsize = sizeof(struct xt_set_info_match_v0),
380 .checkentry = set_match_v0_checkentry,
381 .destroy = set_match_v0_destroy,
382 .me = THIS_MODULE
383 },
384 {
385 .name = "set",
386 .family = NFPROTO_IPV4,
387 .revision = 1,
388 .match = set_match_v1,
389 .matchsize = sizeof(struct xt_set_info_match_v1),
390 .checkentry = set_match_v1_checkentry,
391 .destroy = set_match_v1_destroy,
392 .me = THIS_MODULE
393 },
394 {
395 .name = "set",
396 .family = NFPROTO_IPV6,
397 .revision = 1,
398 .match = set_match_v1,
399 .matchsize = sizeof(struct xt_set_info_match_v1),
400 .checkentry = set_match_v1_checkentry,
401 .destroy = set_match_v1_destroy,
402 .me = THIS_MODULE
403 },
404 /* --return-nomatch flag support */
405 {
406 .name = "set",
407 .family = NFPROTO_IPV4,
408 .revision = 2,
409 .match = set_match_v1,
410 .matchsize = sizeof(struct xt_set_info_match_v1),
411 .checkentry = set_match_v1_checkentry,
412 .destroy = set_match_v1_destroy,
413 .me = THIS_MODULE
414 },
415 {
416 .name = "set",
417 .family = NFPROTO_IPV6,
418 .revision = 2,
419 .match = set_match_v1,
420 .matchsize = sizeof(struct xt_set_info_match_v1),
421 .checkentry = set_match_v1_checkentry,
422 .destroy = set_match_v1_destroy,
423 .me = THIS_MODULE
424 },
425 /* counters support: update, match */
426 {
427 .name = "set",
428 .family = NFPROTO_IPV4,
429 .revision = 3,
430 .match = set_match_v3,
431 .matchsize = sizeof(struct xt_set_info_match_v3),
432 .checkentry = set_match_v3_checkentry,
433 .destroy = set_match_v3_destroy,
434 .me = THIS_MODULE
435 },
436 {
437 .name = "set",
438 .family = NFPROTO_IPV6,
439 .revision = 3,
440 .match = set_match_v3,
441 .matchsize = sizeof(struct xt_set_info_match_v3),
442 .checkentry = set_match_v3_checkentry,
443 .destroy = set_match_v3_destroy,
444 .me = THIS_MODULE
445 },
446};
447
448static struct xt_target set_targets[] __read_mostly = {
449 {
450 .name = "SET",
451 .revision = 0,
452 .family = NFPROTO_IPV4,
453 .target = set_target_v0,
454 .targetsize = sizeof(struct xt_set_info_target_v0),
455 .checkentry = set_target_v0_checkentry,
456 .destroy = set_target_v0_destroy,
457 .me = THIS_MODULE
458 },
459 {
460 .name = "SET",
461 .revision = 1,
462 .family = NFPROTO_IPV4,
463 .target = set_target_v1,
464 .targetsize = sizeof(struct xt_set_info_target_v1),
465 .checkentry = set_target_v1_checkentry,
466 .destroy = set_target_v1_destroy,
467 .me = THIS_MODULE
468 },
469 {
470 .name = "SET",
471 .revision = 1,
472 .family = NFPROTO_IPV6,
473 .target = set_target_v1,
474 .targetsize = sizeof(struct xt_set_info_target_v1),
475 .checkentry = set_target_v1_checkentry,
476 .destroy = set_target_v1_destroy,
477 .me = THIS_MODULE
478 },
479 /* --timeout and --exist flags support */
480 {
481 .name = "SET",
482 .revision = 2,
483 .family = NFPROTO_IPV4,
484 .target = set_target_v2,
485 .targetsize = sizeof(struct xt_set_info_target_v2),
486 .checkentry = set_target_v2_checkentry,
487 .destroy = set_target_v2_destroy,
488 .me = THIS_MODULE
489 },
490 {
491 .name = "SET",
492 .revision = 2,
493 .family = NFPROTO_IPV6,
494 .target = set_target_v2,
495 .targetsize = sizeof(struct xt_set_info_target_v2),
496 .checkentry = set_target_v2_checkentry,
497 .destroy = set_target_v2_destroy,
498 .me = THIS_MODULE
499 },
500};
501
502static int __init xt_set_init(void)
503{
504 int ret = xt_register_matches(set_matches, ARRAY_SIZE(set_matches));
505
506 if (!ret) {
507 ret = xt_register_targets(set_targets,
508 ARRAY_SIZE(set_targets));
509 if (ret)
510 xt_unregister_matches(set_matches,
511 ARRAY_SIZE(set_matches));
512 }
513 return ret;
514}
515
516static void __exit xt_set_fini(void)
517{
518 xt_unregister_matches(set_matches, ARRAY_SIZE(set_matches));
519 xt_unregister_targets(set_targets, ARRAY_SIZE(set_targets));
520}
521
522module_init(xt_set_init);
523module_exit(xt_set_fini);