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11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13#include <linux/cache.h>
14#include <linux/capability.h>
15#include <linux/skbuff.h>
16#include <linux/kmod.h>
17#include <linux/vmalloc.h>
18#include <linux/netdevice.h>
19#include <linux/module.h>
20#include <linux/icmp.h>
21#include <net/ip.h>
22#include <net/compat.h>
23#include <asm/uaccess.h>
24#include <linux/mutex.h>
25#include <linux/proc_fs.h>
26#include <linux/err.h>
27#include <linux/cpumask.h>
28
29#include <linux/netfilter/x_tables.h>
30#include <linux/netfilter_ipv4/ip_tables.h>
31#include <net/netfilter/nf_log.h>
32#include "../../netfilter/xt_repldata.h"
33
34MODULE_LICENSE("GPL");
35MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
36MODULE_DESCRIPTION("IPv4 packet filter");
37
38
39
40
41
42#ifdef DEBUG_IP_FIREWALL
43#define dprintf(format, args...) pr_info(format , ## args)
44#else
45#define dprintf(format, args...)
46#endif
47
48#ifdef DEBUG_IP_FIREWALL_USER
49#define duprintf(format, args...) pr_info(format , ## args)
50#else
51#define duprintf(format, args...)
52#endif
53
54#ifdef CONFIG_NETFILTER_DEBUG
55#define IP_NF_ASSERT(x) WARN_ON(!(x))
56#else
57#define IP_NF_ASSERT(x)
58#endif
59
60#if 0
61
62#define static
63#define inline
64#endif
65
66void *ipt_alloc_initial_table(const struct xt_table *info)
67{
68 return xt_alloc_initial_table(ipt, IPT);
69}
70EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
71
72
73
74static inline bool
75ip_packet_match(const struct iphdr *ip,
76 const char *indev,
77 const char *outdev,
78 const struct ipt_ip *ipinfo,
79 int isfrag)
80{
81 unsigned long ret;
82
83#define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
84
85 if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
86 IPT_INV_SRCIP) ||
87 FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
88 IPT_INV_DSTIP)) {
89 dprintf("Source or dest mismatch.\n");
90
91 dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
92 &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr,
93 ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : "");
94 dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n",
95 &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr,
96 ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : "");
97 return false;
98 }
99
100 ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
101
102 if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
103 dprintf("VIA in mismatch (%s vs %s).%s\n",
104 indev, ipinfo->iniface,
105 ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
106 return false;
107 }
108
109 ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
110
111 if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
112 dprintf("VIA out mismatch (%s vs %s).%s\n",
113 outdev, ipinfo->outiface,
114 ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
115 return false;
116 }
117
118
119 if (ipinfo->proto &&
120 FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) {
121 dprintf("Packet protocol %hi does not match %hi.%s\n",
122 ip->protocol, ipinfo->proto,
123 ipinfo->invflags&IPT_INV_PROTO ? " (INV)":"");
124 return false;
125 }
126
127
128
129 if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) {
130 dprintf("Fragment rule but not fragment.%s\n",
131 ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : "");
132 return false;
133 }
134
135 return true;
136}
137
138static bool
139ip_checkentry(const struct ipt_ip *ip)
140{
141 if (ip->flags & ~IPT_F_MASK) {
142 duprintf("Unknown flag bits set: %08X\n",
143 ip->flags & ~IPT_F_MASK);
144 return false;
145 }
146 if (ip->invflags & ~IPT_INV_MASK) {
147 duprintf("Unknown invflag bits set: %08X\n",
148 ip->invflags & ~IPT_INV_MASK);
149 return false;
150 }
151 return true;
152}
153
154static unsigned int
155ipt_error(struct sk_buff *skb, const struct xt_action_param *par)
156{
157 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
158
159 return NF_DROP;
160}
161
162
163static inline struct ipt_entry *
164get_entry(const void *base, unsigned int offset)
165{
166 return (struct ipt_entry *)(base + offset);
167}
168
169
170
171static inline bool unconditional(const struct ipt_ip *ip)
172{
173 static const struct ipt_ip uncond;
174
175 return memcmp(ip, &uncond, sizeof(uncond)) == 0;
176#undef FWINV
177}
178
179
180static inline const struct xt_entry_target *
181ipt_get_target_c(const struct ipt_entry *e)
182{
183 return ipt_get_target((struct ipt_entry *)e);
184}
185
186#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
187static const char *const hooknames[] = {
188 [NF_INET_PRE_ROUTING] = "PREROUTING",
189 [NF_INET_LOCAL_IN] = "INPUT",
190 [NF_INET_FORWARD] = "FORWARD",
191 [NF_INET_LOCAL_OUT] = "OUTPUT",
192 [NF_INET_POST_ROUTING] = "POSTROUTING",
193};
194
195enum nf_ip_trace_comments {
196 NF_IP_TRACE_COMMENT_RULE,
197 NF_IP_TRACE_COMMENT_RETURN,
198 NF_IP_TRACE_COMMENT_POLICY,
199};
200
201static const char *const comments[] = {
202 [NF_IP_TRACE_COMMENT_RULE] = "rule",
203 [NF_IP_TRACE_COMMENT_RETURN] = "return",
204 [NF_IP_TRACE_COMMENT_POLICY] = "policy",
205};
206
207static struct nf_loginfo trace_loginfo = {
208 .type = NF_LOG_TYPE_LOG,
209 .u = {
210 .log = {
211 .level = 4,
212 .logflags = NF_LOG_MASK,
213 },
214 },
215};
216
217
218static inline int
219get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e,
220 const char *hookname, const char **chainname,
221 const char **comment, unsigned int *rulenum)
222{
223 const struct xt_standard_target *t = (void *)ipt_get_target_c(s);
224
225 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
226
227 *chainname = t->target.data;
228 (*rulenum) = 0;
229 } else if (s == e) {
230 (*rulenum)++;
231
232 if (s->target_offset == sizeof(struct ipt_entry) &&
233 strcmp(t->target.u.kernel.target->name,
234 XT_STANDARD_TARGET) == 0 &&
235 t->verdict < 0 &&
236 unconditional(&s->ip)) {
237
238 *comment = *chainname == hookname
239 ? comments[NF_IP_TRACE_COMMENT_POLICY]
240 : comments[NF_IP_TRACE_COMMENT_RETURN];
241 }
242 return 1;
243 } else
244 (*rulenum)++;
245
246 return 0;
247}
248
249static void trace_packet(const struct sk_buff *skb,
250 unsigned int hook,
251 const struct net_device *in,
252 const struct net_device *out,
253 const char *tablename,
254 const struct xt_table_info *private,
255 const struct ipt_entry *e)
256{
257 const void *table_base;
258 const struct ipt_entry *root;
259 const char *hookname, *chainname, *comment;
260 const struct ipt_entry *iter;
261 unsigned int rulenum = 0;
262 struct net *net = dev_net(in ? in : out);
263
264 table_base = private->entries[smp_processor_id()];
265 root = get_entry(table_base, private->hook_entry[hook]);
266
267 hookname = chainname = hooknames[hook];
268 comment = comments[NF_IP_TRACE_COMMENT_RULE];
269
270 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
271 if (get_chainname_rulenum(iter, e, hookname,
272 &chainname, &comment, &rulenum) != 0)
273 break;
274
275 nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo,
276 "TRACE: %s:%s:%s:%u ",
277 tablename, chainname, comment, rulenum);
278}
279#endif
280
281static inline __pure
282struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry)
283{
284 return (void *)entry + entry->next_offset;
285}
286
287
288unsigned int
289ipt_do_table(struct sk_buff *skb,
290 unsigned int hook,
291 const struct nf_hook_state *state,
292 struct xt_table *table)
293{
294 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
295 const struct iphdr *ip;
296
297 unsigned int verdict = NF_DROP;
298 const char *indev, *outdev;
299 const void *table_base;
300 struct ipt_entry *e, **jumpstack;
301 unsigned int *stackptr, origptr, cpu;
302 const struct xt_table_info *private;
303 struct xt_action_param acpar;
304 unsigned int addend;
305
306
307 ip = ip_hdr(skb);
308 indev = state->in ? state->in->name : nulldevname;
309 outdev = state->out ? state->out->name : nulldevname;
310
311
312
313
314
315
316 acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
317 acpar.thoff = ip_hdrlen(skb);
318 acpar.hotdrop = false;
319 acpar.in = state->in;
320 acpar.out = state->out;
321 acpar.family = NFPROTO_IPV4;
322 acpar.hooknum = hook;
323
324 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
325 local_bh_disable();
326 addend = xt_write_recseq_begin();
327 private = table->private;
328 cpu = smp_processor_id();
329
330
331
332
333 smp_read_barrier_depends();
334 table_base = private->entries[cpu];
335 jumpstack = (struct ipt_entry **)private->jumpstack[cpu];
336 stackptr = per_cpu_ptr(private->stackptr, cpu);
337 origptr = *stackptr;
338
339 e = get_entry(table_base, private->hook_entry[hook]);
340
341 pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
342 table->name, hook, origptr,
343 get_entry(table_base, private->underflow[hook]));
344
345 do {
346 const struct xt_entry_target *t;
347 const struct xt_entry_match *ematch;
348
349 IP_NF_ASSERT(e);
350 if (!ip_packet_match(ip, indev, outdev,
351 &e->ip, acpar.fragoff)) {
352 no_match:
353 e = ipt_next_entry(e);
354 continue;
355 }
356
357 xt_ematch_foreach(ematch, e) {
358 acpar.match = ematch->u.kernel.match;
359 acpar.matchinfo = ematch->data;
360 if (!acpar.match->match(skb, &acpar))
361 goto no_match;
362 }
363
364 ADD_COUNTER(e->counters, skb->len, 1);
365
366 t = ipt_get_target(e);
367 IP_NF_ASSERT(t->u.kernel.target);
368
369#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
370
371 if (unlikely(skb->nf_trace))
372 trace_packet(skb, hook, state->in, state->out,
373 table->name, private, e);
374#endif
375
376 if (!t->u.kernel.target->target) {
377 int v;
378
379 v = ((struct xt_standard_target *)t)->verdict;
380 if (v < 0) {
381
382 if (v != XT_RETURN) {
383 verdict = (unsigned int)(-v) - 1;
384 break;
385 }
386 if (*stackptr <= origptr) {
387 e = get_entry(table_base,
388 private->underflow[hook]);
389 pr_debug("Underflow (this is normal) "
390 "to %p\n", e);
391 } else {
392 e = jumpstack[--*stackptr];
393 pr_debug("Pulled %p out from pos %u\n",
394 e, *stackptr);
395 e = ipt_next_entry(e);
396 }
397 continue;
398 }
399 if (table_base + v != ipt_next_entry(e) &&
400 !(e->ip.flags & IPT_F_GOTO)) {
401 if (*stackptr >= private->stacksize) {
402 verdict = NF_DROP;
403 break;
404 }
405 jumpstack[(*stackptr)++] = e;
406 pr_debug("Pushed %p into pos %u\n",
407 e, *stackptr - 1);
408 }
409
410 e = get_entry(table_base, v);
411 continue;
412 }
413
414 acpar.target = t->u.kernel.target;
415 acpar.targinfo = t->data;
416
417 verdict = t->u.kernel.target->target(skb, &acpar);
418
419 ip = ip_hdr(skb);
420 if (verdict == XT_CONTINUE)
421 e = ipt_next_entry(e);
422 else
423
424 break;
425 } while (!acpar.hotdrop);
426 pr_debug("Exiting %s; resetting sp from %u to %u\n",
427 __func__, *stackptr, origptr);
428 *stackptr = origptr;
429 xt_write_recseq_end(addend);
430 local_bh_enable();
431
432#ifdef DEBUG_ALLOW_ALL
433 return NF_ACCEPT;
434#else
435 if (acpar.hotdrop)
436 return NF_DROP;
437 else return verdict;
438#endif
439}
440
441
442
443static int
444mark_source_chains(const struct xt_table_info *newinfo,
445 unsigned int valid_hooks, void *entry0)
446{
447 unsigned int hook;
448
449
450
451 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
452 unsigned int pos = newinfo->hook_entry[hook];
453 struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos);
454
455 if (!(valid_hooks & (1 << hook)))
456 continue;
457
458
459 e->counters.pcnt = pos;
460
461 for (;;) {
462 const struct xt_standard_target *t
463 = (void *)ipt_get_target_c(e);
464 int visited = e->comefrom & (1 << hook);
465
466 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
467 pr_err("iptables: loop hook %u pos %u %08X.\n",
468 hook, pos, e->comefrom);
469 return 0;
470 }
471 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
472
473
474 if ((e->target_offset == sizeof(struct ipt_entry) &&
475 (strcmp(t->target.u.user.name,
476 XT_STANDARD_TARGET) == 0) &&
477 t->verdict < 0 && unconditional(&e->ip)) ||
478 visited) {
479 unsigned int oldpos, size;
480
481 if ((strcmp(t->target.u.user.name,
482 XT_STANDARD_TARGET) == 0) &&
483 t->verdict < -NF_MAX_VERDICT - 1) {
484 duprintf("mark_source_chains: bad "
485 "negative verdict (%i)\n",
486 t->verdict);
487 return 0;
488 }
489
490
491
492 do {
493 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
494#ifdef DEBUG_IP_FIREWALL_USER
495 if (e->comefrom
496 & (1 << NF_INET_NUMHOOKS)) {
497 duprintf("Back unset "
498 "on hook %u "
499 "rule %u\n",
500 hook, pos);
501 }
502#endif
503 oldpos = pos;
504 pos = e->counters.pcnt;
505 e->counters.pcnt = 0;
506
507
508 if (pos == oldpos)
509 goto next;
510
511 e = (struct ipt_entry *)
512 (entry0 + pos);
513 } while (oldpos == pos + e->next_offset);
514
515
516 size = e->next_offset;
517 e = (struct ipt_entry *)
518 (entry0 + pos + size);
519 e->counters.pcnt = pos;
520 pos += size;
521 } else {
522 int newpos = t->verdict;
523
524 if (strcmp(t->target.u.user.name,
525 XT_STANDARD_TARGET) == 0 &&
526 newpos >= 0) {
527 if (newpos > newinfo->size -
528 sizeof(struct ipt_entry)) {
529 duprintf("mark_source_chains: "
530 "bad verdict (%i)\n",
531 newpos);
532 return 0;
533 }
534
535 duprintf("Jump rule %u -> %u\n",
536 pos, newpos);
537 } else {
538
539 newpos = pos + e->next_offset;
540 }
541 e = (struct ipt_entry *)
542 (entry0 + newpos);
543 e->counters.pcnt = pos;
544 pos = newpos;
545 }
546 }
547 next:
548 duprintf("Finished chain %u\n", hook);
549 }
550 return 1;
551}
552
553static void cleanup_match(struct xt_entry_match *m, struct net *net)
554{
555 struct xt_mtdtor_param par;
556
557 par.net = net;
558 par.match = m->u.kernel.match;
559 par.matchinfo = m->data;
560 par.family = NFPROTO_IPV4;
561 if (par.match->destroy != NULL)
562 par.match->destroy(&par);
563 module_put(par.match->me);
564}
565
566static int
567check_entry(const struct ipt_entry *e, const char *name)
568{
569 const struct xt_entry_target *t;
570
571 if (!ip_checkentry(&e->ip)) {
572 duprintf("ip check failed %p %s.\n", e, name);
573 return -EINVAL;
574 }
575
576 if (e->target_offset + sizeof(struct xt_entry_target) >
577 e->next_offset)
578 return -EINVAL;
579
580 t = ipt_get_target_c(e);
581 if (e->target_offset + t->u.target_size > e->next_offset)
582 return -EINVAL;
583
584 return 0;
585}
586
587static int
588check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
589{
590 const struct ipt_ip *ip = par->entryinfo;
591 int ret;
592
593 par->match = m->u.kernel.match;
594 par->matchinfo = m->data;
595
596 ret = xt_check_match(par, m->u.match_size - sizeof(*m),
597 ip->proto, ip->invflags & IPT_INV_PROTO);
598 if (ret < 0) {
599 duprintf("check failed for `%s'.\n", par->match->name);
600 return ret;
601 }
602 return 0;
603}
604
605static int
606find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
607{
608 struct xt_match *match;
609 int ret;
610
611 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
612 m->u.user.revision);
613 if (IS_ERR(match)) {
614 duprintf("find_check_match: `%s' not found\n", m->u.user.name);
615 return PTR_ERR(match);
616 }
617 m->u.kernel.match = match;
618
619 ret = check_match(m, par);
620 if (ret)
621 goto err;
622
623 return 0;
624err:
625 module_put(m->u.kernel.match->me);
626 return ret;
627}
628
629static int check_target(struct ipt_entry *e, struct net *net, const char *name)
630{
631 struct xt_entry_target *t = ipt_get_target(e);
632 struct xt_tgchk_param par = {
633 .net = net,
634 .table = name,
635 .entryinfo = e,
636 .target = t->u.kernel.target,
637 .targinfo = t->data,
638 .hook_mask = e->comefrom,
639 .family = NFPROTO_IPV4,
640 };
641 int ret;
642
643 ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
644 e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
645 if (ret < 0) {
646 duprintf("check failed for `%s'.\n",
647 t->u.kernel.target->name);
648 return ret;
649 }
650 return 0;
651}
652
653static int
654find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
655 unsigned int size)
656{
657 struct xt_entry_target *t;
658 struct xt_target *target;
659 int ret;
660 unsigned int j;
661 struct xt_mtchk_param mtpar;
662 struct xt_entry_match *ematch;
663
664 ret = check_entry(e, name);
665 if (ret)
666 return ret;
667
668 j = 0;
669 mtpar.net = net;
670 mtpar.table = name;
671 mtpar.entryinfo = &e->ip;
672 mtpar.hook_mask = e->comefrom;
673 mtpar.family = NFPROTO_IPV4;
674 xt_ematch_foreach(ematch, e) {
675 ret = find_check_match(ematch, &mtpar);
676 if (ret != 0)
677 goto cleanup_matches;
678 ++j;
679 }
680
681 t = ipt_get_target(e);
682 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
683 t->u.user.revision);
684 if (IS_ERR(target)) {
685 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
686 ret = PTR_ERR(target);
687 goto cleanup_matches;
688 }
689 t->u.kernel.target = target;
690
691 ret = check_target(e, net, name);
692 if (ret)
693 goto err;
694 return 0;
695 err:
696 module_put(t->u.kernel.target->me);
697 cleanup_matches:
698 xt_ematch_foreach(ematch, e) {
699 if (j-- == 0)
700 break;
701 cleanup_match(ematch, net);
702 }
703 return ret;
704}
705
706static bool check_underflow(const struct ipt_entry *e)
707{
708 const struct xt_entry_target *t;
709 unsigned int verdict;
710
711 if (!unconditional(&e->ip))
712 return false;
713 t = ipt_get_target_c(e);
714 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
715 return false;
716 verdict = ((struct xt_standard_target *)t)->verdict;
717 verdict = -verdict - 1;
718 return verdict == NF_DROP || verdict == NF_ACCEPT;
719}
720
721static int
722check_entry_size_and_hooks(struct ipt_entry *e,
723 struct xt_table_info *newinfo,
724 const unsigned char *base,
725 const unsigned char *limit,
726 const unsigned int *hook_entries,
727 const unsigned int *underflows,
728 unsigned int valid_hooks)
729{
730 unsigned int h;
731
732 if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
733 (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
734 duprintf("Bad offset %p\n", e);
735 return -EINVAL;
736 }
737
738 if (e->next_offset
739 < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) {
740 duprintf("checking: element %p size %u\n",
741 e, e->next_offset);
742 return -EINVAL;
743 }
744
745
746 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
747 if (!(valid_hooks & (1 << h)))
748 continue;
749 if ((unsigned char *)e - base == hook_entries[h])
750 newinfo->hook_entry[h] = hook_entries[h];
751 if ((unsigned char *)e - base == underflows[h]) {
752 if (!check_underflow(e)) {
753 pr_err("Underflows must be unconditional and "
754 "use the STANDARD target with "
755 "ACCEPT/DROP\n");
756 return -EINVAL;
757 }
758 newinfo->underflow[h] = underflows[h];
759 }
760 }
761
762
763 e->counters = ((struct xt_counters) { 0, 0 });
764 e->comefrom = 0;
765 return 0;
766}
767
768static void
769cleanup_entry(struct ipt_entry *e, struct net *net)
770{
771 struct xt_tgdtor_param par;
772 struct xt_entry_target *t;
773 struct xt_entry_match *ematch;
774
775
776 xt_ematch_foreach(ematch, e)
777 cleanup_match(ematch, net);
778 t = ipt_get_target(e);
779
780 par.net = net;
781 par.target = t->u.kernel.target;
782 par.targinfo = t->data;
783 par.family = NFPROTO_IPV4;
784 if (par.target->destroy != NULL)
785 par.target->destroy(&par);
786 module_put(par.target->me);
787}
788
789
790
791static int
792translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
793 const struct ipt_replace *repl)
794{
795 struct ipt_entry *iter;
796 unsigned int i;
797 int ret = 0;
798
799 newinfo->size = repl->size;
800 newinfo->number = repl->num_entries;
801
802
803 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
804 newinfo->hook_entry[i] = 0xFFFFFFFF;
805 newinfo->underflow[i] = 0xFFFFFFFF;
806 }
807
808 duprintf("translate_table: size %u\n", newinfo->size);
809 i = 0;
810
811 xt_entry_foreach(iter, entry0, newinfo->size) {
812 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
813 entry0 + repl->size,
814 repl->hook_entry,
815 repl->underflow,
816 repl->valid_hooks);
817 if (ret != 0)
818 return ret;
819 ++i;
820 if (strcmp(ipt_get_target(iter)->u.user.name,
821 XT_ERROR_TARGET) == 0)
822 ++newinfo->stacksize;
823 }
824
825 if (i != repl->num_entries) {
826 duprintf("translate_table: %u not %u entries\n",
827 i, repl->num_entries);
828 return -EINVAL;
829 }
830
831
832 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
833
834 if (!(repl->valid_hooks & (1 << i)))
835 continue;
836 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
837 duprintf("Invalid hook entry %u %u\n",
838 i, repl->hook_entry[i]);
839 return -EINVAL;
840 }
841 if (newinfo->underflow[i] == 0xFFFFFFFF) {
842 duprintf("Invalid underflow %u %u\n",
843 i, repl->underflow[i]);
844 return -EINVAL;
845 }
846 }
847
848 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
849 return -ELOOP;
850
851
852 i = 0;
853 xt_entry_foreach(iter, entry0, newinfo->size) {
854 ret = find_check_entry(iter, net, repl->name, repl->size);
855 if (ret != 0)
856 break;
857 ++i;
858 }
859
860 if (ret != 0) {
861 xt_entry_foreach(iter, entry0, newinfo->size) {
862 if (i-- == 0)
863 break;
864 cleanup_entry(iter, net);
865 }
866 return ret;
867 }
868
869
870 for_each_possible_cpu(i) {
871 if (newinfo->entries[i] && newinfo->entries[i] != entry0)
872 memcpy(newinfo->entries[i], entry0, newinfo->size);
873 }
874
875 return ret;
876}
877
878static void
879get_counters(const struct xt_table_info *t,
880 struct xt_counters counters[])
881{
882 struct ipt_entry *iter;
883 unsigned int cpu;
884 unsigned int i;
885
886 for_each_possible_cpu(cpu) {
887 seqcount_t *s = &per_cpu(xt_recseq, cpu);
888
889 i = 0;
890 xt_entry_foreach(iter, t->entries[cpu], t->size) {
891 u64 bcnt, pcnt;
892 unsigned int start;
893
894 do {
895 start = read_seqcount_begin(s);
896 bcnt = iter->counters.bcnt;
897 pcnt = iter->counters.pcnt;
898 } while (read_seqcount_retry(s, start));
899
900 ADD_COUNTER(counters[i], bcnt, pcnt);
901 ++i;
902 }
903 }
904}
905
906static struct xt_counters *alloc_counters(const struct xt_table *table)
907{
908 unsigned int countersize;
909 struct xt_counters *counters;
910 const struct xt_table_info *private = table->private;
911
912
913
914
915 countersize = sizeof(struct xt_counters) * private->number;
916 counters = vzalloc(countersize);
917
918 if (counters == NULL)
919 return ERR_PTR(-ENOMEM);
920
921 get_counters(private, counters);
922
923 return counters;
924}
925
926static int
927copy_entries_to_user(unsigned int total_size,
928 const struct xt_table *table,
929 void __user *userptr)
930{
931 unsigned int off, num;
932 const struct ipt_entry *e;
933 struct xt_counters *counters;
934 const struct xt_table_info *private = table->private;
935 int ret = 0;
936 const void *loc_cpu_entry;
937
938 counters = alloc_counters(table);
939 if (IS_ERR(counters))
940 return PTR_ERR(counters);
941
942
943
944
945
946 loc_cpu_entry = private->entries[raw_smp_processor_id()];
947 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
948 ret = -EFAULT;
949 goto free_counters;
950 }
951
952
953
954 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
955 unsigned int i;
956 const struct xt_entry_match *m;
957 const struct xt_entry_target *t;
958
959 e = (struct ipt_entry *)(loc_cpu_entry + off);
960 if (copy_to_user(userptr + off
961 + offsetof(struct ipt_entry, counters),
962 &counters[num],
963 sizeof(counters[num])) != 0) {
964 ret = -EFAULT;
965 goto free_counters;
966 }
967
968 for (i = sizeof(struct ipt_entry);
969 i < e->target_offset;
970 i += m->u.match_size) {
971 m = (void *)e + i;
972
973 if (copy_to_user(userptr + off + i
974 + offsetof(struct xt_entry_match,
975 u.user.name),
976 m->u.kernel.match->name,
977 strlen(m->u.kernel.match->name)+1)
978 != 0) {
979 ret = -EFAULT;
980 goto free_counters;
981 }
982 }
983
984 t = ipt_get_target_c(e);
985 if (copy_to_user(userptr + off + e->target_offset
986 + offsetof(struct xt_entry_target,
987 u.user.name),
988 t->u.kernel.target->name,
989 strlen(t->u.kernel.target->name)+1) != 0) {
990 ret = -EFAULT;
991 goto free_counters;
992 }
993 }
994
995 free_counters:
996 vfree(counters);
997 return ret;
998}
999
1000#ifdef CONFIG_COMPAT
1001static void compat_standard_from_user(void *dst, const void *src)
1002{
1003 int v = *(compat_int_t *)src;
1004
1005 if (v > 0)
1006 v += xt_compat_calc_jump(AF_INET, v);
1007 memcpy(dst, &v, sizeof(v));
1008}
1009
1010static int compat_standard_to_user(void __user *dst, const void *src)
1011{
1012 compat_int_t cv = *(int *)src;
1013
1014 if (cv > 0)
1015 cv -= xt_compat_calc_jump(AF_INET, cv);
1016 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
1017}
1018
1019static int compat_calc_entry(const struct ipt_entry *e,
1020 const struct xt_table_info *info,
1021 const void *base, struct xt_table_info *newinfo)
1022{
1023 const struct xt_entry_match *ematch;
1024 const struct xt_entry_target *t;
1025 unsigned int entry_offset;
1026 int off, i, ret;
1027
1028 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1029 entry_offset = (void *)e - base;
1030 xt_ematch_foreach(ematch, e)
1031 off += xt_compat_match_offset(ematch->u.kernel.match);
1032 t = ipt_get_target_c(e);
1033 off += xt_compat_target_offset(t->u.kernel.target);
1034 newinfo->size -= off;
1035 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
1036 if (ret)
1037 return ret;
1038
1039 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1040 if (info->hook_entry[i] &&
1041 (e < (struct ipt_entry *)(base + info->hook_entry[i])))
1042 newinfo->hook_entry[i] -= off;
1043 if (info->underflow[i] &&
1044 (e < (struct ipt_entry *)(base + info->underflow[i])))
1045 newinfo->underflow[i] -= off;
1046 }
1047 return 0;
1048}
1049
1050static int compat_table_info(const struct xt_table_info *info,
1051 struct xt_table_info *newinfo)
1052{
1053 struct ipt_entry *iter;
1054 void *loc_cpu_entry;
1055 int ret;
1056
1057 if (!newinfo || !info)
1058 return -EINVAL;
1059
1060
1061 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
1062 newinfo->initial_entries = 0;
1063 loc_cpu_entry = info->entries[raw_smp_processor_id()];
1064 xt_compat_init_offsets(AF_INET, info->number);
1065 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
1066 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
1067 if (ret != 0)
1068 return ret;
1069 }
1070 return 0;
1071}
1072#endif
1073
1074static int get_info(struct net *net, void __user *user,
1075 const int *len, int compat)
1076{
1077 char name[XT_TABLE_MAXNAMELEN];
1078 struct xt_table *t;
1079 int ret;
1080
1081 if (*len != sizeof(struct ipt_getinfo)) {
1082 duprintf("length %u != %zu\n", *len,
1083 sizeof(struct ipt_getinfo));
1084 return -EINVAL;
1085 }
1086
1087 if (copy_from_user(name, user, sizeof(name)) != 0)
1088 return -EFAULT;
1089
1090 name[XT_TABLE_MAXNAMELEN-1] = '\0';
1091#ifdef CONFIG_COMPAT
1092 if (compat)
1093 xt_compat_lock(AF_INET);
1094#endif
1095 t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
1096 "iptable_%s", name);
1097 if (!IS_ERR_OR_NULL(t)) {
1098 struct ipt_getinfo info;
1099 const struct xt_table_info *private = t->private;
1100#ifdef CONFIG_COMPAT
1101 struct xt_table_info tmp;
1102
1103 if (compat) {
1104 ret = compat_table_info(private, &tmp);
1105 xt_compat_flush_offsets(AF_INET);
1106 private = &tmp;
1107 }
1108#endif
1109 memset(&info, 0, sizeof(info));
1110 info.valid_hooks = t->valid_hooks;
1111 memcpy(info.hook_entry, private->hook_entry,
1112 sizeof(info.hook_entry));
1113 memcpy(info.underflow, private->underflow,
1114 sizeof(info.underflow));
1115 info.num_entries = private->number;
1116 info.size = private->size;
1117 strcpy(info.name, name);
1118
1119 if (copy_to_user(user, &info, *len) != 0)
1120 ret = -EFAULT;
1121 else
1122 ret = 0;
1123
1124 xt_table_unlock(t);
1125 module_put(t->me);
1126 } else
1127 ret = t ? PTR_ERR(t) : -ENOENT;
1128#ifdef CONFIG_COMPAT
1129 if (compat)
1130 xt_compat_unlock(AF_INET);
1131#endif
1132 return ret;
1133}
1134
1135static int
1136get_entries(struct net *net, struct ipt_get_entries __user *uptr,
1137 const int *len)
1138{
1139 int ret;
1140 struct ipt_get_entries get;
1141 struct xt_table *t;
1142
1143 if (*len < sizeof(get)) {
1144 duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
1145 return -EINVAL;
1146 }
1147 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1148 return -EFAULT;
1149 if (*len != sizeof(struct ipt_get_entries) + get.size) {
1150 duprintf("get_entries: %u != %zu\n",
1151 *len, sizeof(get) + get.size);
1152 return -EINVAL;
1153 }
1154
1155 t = xt_find_table_lock(net, AF_INET, get.name);
1156 if (!IS_ERR_OR_NULL(t)) {
1157 const struct xt_table_info *private = t->private;
1158 duprintf("t->private->number = %u\n", private->number);
1159 if (get.size == private->size)
1160 ret = copy_entries_to_user(private->size,
1161 t, uptr->entrytable);
1162 else {
1163 duprintf("get_entries: I've got %u not %u!\n",
1164 private->size, get.size);
1165 ret = -EAGAIN;
1166 }
1167 module_put(t->me);
1168 xt_table_unlock(t);
1169 } else
1170 ret = t ? PTR_ERR(t) : -ENOENT;
1171
1172 return ret;
1173}
1174
1175static int
1176__do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1177 struct xt_table_info *newinfo, unsigned int num_counters,
1178 void __user *counters_ptr)
1179{
1180 int ret;
1181 struct xt_table *t;
1182 struct xt_table_info *oldinfo;
1183 struct xt_counters *counters;
1184 void *loc_cpu_old_entry;
1185 struct ipt_entry *iter;
1186
1187 ret = 0;
1188 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1189 if (!counters) {
1190 ret = -ENOMEM;
1191 goto out;
1192 }
1193
1194 t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
1195 "iptable_%s", name);
1196 if (IS_ERR_OR_NULL(t)) {
1197 ret = t ? PTR_ERR(t) : -ENOENT;
1198 goto free_newinfo_counters_untrans;
1199 }
1200
1201
1202 if (valid_hooks != t->valid_hooks) {
1203 duprintf("Valid hook crap: %08X vs %08X\n",
1204 valid_hooks, t->valid_hooks);
1205 ret = -EINVAL;
1206 goto put_module;
1207 }
1208
1209 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1210 if (!oldinfo)
1211 goto put_module;
1212
1213
1214 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1215 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1216 if ((oldinfo->number > oldinfo->initial_entries) ||
1217 (newinfo->number <= oldinfo->initial_entries))
1218 module_put(t->me);
1219 if ((oldinfo->number > oldinfo->initial_entries) &&
1220 (newinfo->number <= oldinfo->initial_entries))
1221 module_put(t->me);
1222
1223
1224 get_counters(oldinfo, counters);
1225
1226
1227 loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
1228 xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
1229 cleanup_entry(iter, net);
1230
1231 xt_free_table_info(oldinfo);
1232 if (copy_to_user(counters_ptr, counters,
1233 sizeof(struct xt_counters) * num_counters) != 0) {
1234
1235 net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n");
1236 }
1237 vfree(counters);
1238 xt_table_unlock(t);
1239 return ret;
1240
1241 put_module:
1242 module_put(t->me);
1243 xt_table_unlock(t);
1244 free_newinfo_counters_untrans:
1245 vfree(counters);
1246 out:
1247 return ret;
1248}
1249
1250static int
1251do_replace(struct net *net, const void __user *user, unsigned int len)
1252{
1253 int ret;
1254 struct ipt_replace tmp;
1255 struct xt_table_info *newinfo;
1256 void *loc_cpu_entry;
1257 struct ipt_entry *iter;
1258
1259 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1260 return -EFAULT;
1261
1262
1263 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1264 return -ENOMEM;
1265 if (tmp.num_counters == 0)
1266 return -EINVAL;
1267
1268 tmp.name[sizeof(tmp.name)-1] = 0;
1269
1270 newinfo = xt_alloc_table_info(tmp.size);
1271 if (!newinfo)
1272 return -ENOMEM;
1273
1274
1275 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1276 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1277 tmp.size) != 0) {
1278 ret = -EFAULT;
1279 goto free_newinfo;
1280 }
1281
1282 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1283 if (ret != 0)
1284 goto free_newinfo;
1285
1286 duprintf("Translated table\n");
1287
1288 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1289 tmp.num_counters, tmp.counters);
1290 if (ret)
1291 goto free_newinfo_untrans;
1292 return 0;
1293
1294 free_newinfo_untrans:
1295 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1296 cleanup_entry(iter, net);
1297 free_newinfo:
1298 xt_free_table_info(newinfo);
1299 return ret;
1300}
1301
1302static int
1303do_add_counters(struct net *net, const void __user *user,
1304 unsigned int len, int compat)
1305{
1306 unsigned int i, curcpu;
1307 struct xt_counters_info tmp;
1308 struct xt_counters *paddc;
1309 unsigned int num_counters;
1310 const char *name;
1311 int size;
1312 void *ptmp;
1313 struct xt_table *t;
1314 const struct xt_table_info *private;
1315 int ret = 0;
1316 void *loc_cpu_entry;
1317 struct ipt_entry *iter;
1318 unsigned int addend;
1319#ifdef CONFIG_COMPAT
1320 struct compat_xt_counters_info compat_tmp;
1321
1322 if (compat) {
1323 ptmp = &compat_tmp;
1324 size = sizeof(struct compat_xt_counters_info);
1325 } else
1326#endif
1327 {
1328 ptmp = &tmp;
1329 size = sizeof(struct xt_counters_info);
1330 }
1331
1332 if (copy_from_user(ptmp, user, size) != 0)
1333 return -EFAULT;
1334
1335#ifdef CONFIG_COMPAT
1336 if (compat) {
1337 num_counters = compat_tmp.num_counters;
1338 name = compat_tmp.name;
1339 } else
1340#endif
1341 {
1342 num_counters = tmp.num_counters;
1343 name = tmp.name;
1344 }
1345
1346 if (len != size + num_counters * sizeof(struct xt_counters))
1347 return -EINVAL;
1348
1349 paddc = vmalloc(len - size);
1350 if (!paddc)
1351 return -ENOMEM;
1352
1353 if (copy_from_user(paddc, user + size, len - size) != 0) {
1354 ret = -EFAULT;
1355 goto free;
1356 }
1357
1358 t = xt_find_table_lock(net, AF_INET, name);
1359 if (IS_ERR_OR_NULL(t)) {
1360 ret = t ? PTR_ERR(t) : -ENOENT;
1361 goto free;
1362 }
1363
1364 local_bh_disable();
1365 private = t->private;
1366 if (private->number != num_counters) {
1367 ret = -EINVAL;
1368 goto unlock_up_free;
1369 }
1370
1371 i = 0;
1372
1373 curcpu = smp_processor_id();
1374 loc_cpu_entry = private->entries[curcpu];
1375 addend = xt_write_recseq_begin();
1376 xt_entry_foreach(iter, loc_cpu_entry, private->size) {
1377 ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
1378 ++i;
1379 }
1380 xt_write_recseq_end(addend);
1381 unlock_up_free:
1382 local_bh_enable();
1383 xt_table_unlock(t);
1384 module_put(t->me);
1385 free:
1386 vfree(paddc);
1387
1388 return ret;
1389}
1390
1391#ifdef CONFIG_COMPAT
1392struct compat_ipt_replace {
1393 char name[XT_TABLE_MAXNAMELEN];
1394 u32 valid_hooks;
1395 u32 num_entries;
1396 u32 size;
1397 u32 hook_entry[NF_INET_NUMHOOKS];
1398 u32 underflow[NF_INET_NUMHOOKS];
1399 u32 num_counters;
1400 compat_uptr_t counters;
1401 struct compat_ipt_entry entries[0];
1402};
1403
1404static int
1405compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
1406 unsigned int *size, struct xt_counters *counters,
1407 unsigned int i)
1408{
1409 struct xt_entry_target *t;
1410 struct compat_ipt_entry __user *ce;
1411 u_int16_t target_offset, next_offset;
1412 compat_uint_t origsize;
1413 const struct xt_entry_match *ematch;
1414 int ret = 0;
1415
1416 origsize = *size;
1417 ce = (struct compat_ipt_entry __user *)*dstptr;
1418 if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 ||
1419 copy_to_user(&ce->counters, &counters[i],
1420 sizeof(counters[i])) != 0)
1421 return -EFAULT;
1422
1423 *dstptr += sizeof(struct compat_ipt_entry);
1424 *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1425
1426 xt_ematch_foreach(ematch, e) {
1427 ret = xt_compat_match_to_user(ematch, dstptr, size);
1428 if (ret != 0)
1429 return ret;
1430 }
1431 target_offset = e->target_offset - (origsize - *size);
1432 t = ipt_get_target(e);
1433 ret = xt_compat_target_to_user(t, dstptr, size);
1434 if (ret)
1435 return ret;
1436 next_offset = e->next_offset - (origsize - *size);
1437 if (put_user(target_offset, &ce->target_offset) != 0 ||
1438 put_user(next_offset, &ce->next_offset) != 0)
1439 return -EFAULT;
1440 return 0;
1441}
1442
1443static int
1444compat_find_calc_match(struct xt_entry_match *m,
1445 const char *name,
1446 const struct ipt_ip *ip,
1447 unsigned int hookmask,
1448 int *size)
1449{
1450 struct xt_match *match;
1451
1452 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
1453 m->u.user.revision);
1454 if (IS_ERR(match)) {
1455 duprintf("compat_check_calc_match: `%s' not found\n",
1456 m->u.user.name);
1457 return PTR_ERR(match);
1458 }
1459 m->u.kernel.match = match;
1460 *size += xt_compat_match_offset(match);
1461 return 0;
1462}
1463
1464static void compat_release_entry(struct compat_ipt_entry *e)
1465{
1466 struct xt_entry_target *t;
1467 struct xt_entry_match *ematch;
1468
1469
1470 xt_ematch_foreach(ematch, e)
1471 module_put(ematch->u.kernel.match->me);
1472 t = compat_ipt_get_target(e);
1473 module_put(t->u.kernel.target->me);
1474}
1475
1476static int
1477check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
1478 struct xt_table_info *newinfo,
1479 unsigned int *size,
1480 const unsigned char *base,
1481 const unsigned char *limit,
1482 const unsigned int *hook_entries,
1483 const unsigned int *underflows,
1484 const char *name)
1485{
1486 struct xt_entry_match *ematch;
1487 struct xt_entry_target *t;
1488 struct xt_target *target;
1489 unsigned int entry_offset;
1490 unsigned int j;
1491 int ret, off, h;
1492
1493 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1494 if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 ||
1495 (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) {
1496 duprintf("Bad offset %p, limit = %p\n", e, limit);
1497 return -EINVAL;
1498 }
1499
1500 if (e->next_offset < sizeof(struct compat_ipt_entry) +
1501 sizeof(struct compat_xt_entry_target)) {
1502 duprintf("checking: element %p size %u\n",
1503 e, e->next_offset);
1504 return -EINVAL;
1505 }
1506
1507
1508 ret = check_entry((struct ipt_entry *)e, name);
1509 if (ret)
1510 return ret;
1511
1512 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1513 entry_offset = (void *)e - (void *)base;
1514 j = 0;
1515 xt_ematch_foreach(ematch, e) {
1516 ret = compat_find_calc_match(ematch, name,
1517 &e->ip, e->comefrom, &off);
1518 if (ret != 0)
1519 goto release_matches;
1520 ++j;
1521 }
1522
1523 t = compat_ipt_get_target(e);
1524 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
1525 t->u.user.revision);
1526 if (IS_ERR(target)) {
1527 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1528 t->u.user.name);
1529 ret = PTR_ERR(target);
1530 goto release_matches;
1531 }
1532 t->u.kernel.target = target;
1533
1534 off += xt_compat_target_offset(target);
1535 *size += off;
1536 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
1537 if (ret)
1538 goto out;
1539
1540
1541 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1542 if ((unsigned char *)e - base == hook_entries[h])
1543 newinfo->hook_entry[h] = hook_entries[h];
1544 if ((unsigned char *)e - base == underflows[h])
1545 newinfo->underflow[h] = underflows[h];
1546 }
1547
1548
1549 memset(&e->counters, 0, sizeof(e->counters));
1550 e->comefrom = 0;
1551 return 0;
1552
1553out:
1554 module_put(t->u.kernel.target->me);
1555release_matches:
1556 xt_ematch_foreach(ematch, e) {
1557 if (j-- == 0)
1558 break;
1559 module_put(ematch->u.kernel.match->me);
1560 }
1561 return ret;
1562}
1563
1564static int
1565compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
1566 unsigned int *size, const char *name,
1567 struct xt_table_info *newinfo, unsigned char *base)
1568{
1569 struct xt_entry_target *t;
1570 struct xt_target *target;
1571 struct ipt_entry *de;
1572 unsigned int origsize;
1573 int ret, h;
1574 struct xt_entry_match *ematch;
1575
1576 ret = 0;
1577 origsize = *size;
1578 de = (struct ipt_entry *)*dstptr;
1579 memcpy(de, e, sizeof(struct ipt_entry));
1580 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1581
1582 *dstptr += sizeof(struct ipt_entry);
1583 *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1584
1585 xt_ematch_foreach(ematch, e) {
1586 ret = xt_compat_match_from_user(ematch, dstptr, size);
1587 if (ret != 0)
1588 return ret;
1589 }
1590 de->target_offset = e->target_offset - (origsize - *size);
1591 t = compat_ipt_get_target(e);
1592 target = t->u.kernel.target;
1593 xt_compat_target_from_user(t, dstptr, size);
1594
1595 de->next_offset = e->next_offset - (origsize - *size);
1596 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1597 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1598 newinfo->hook_entry[h] -= origsize - *size;
1599 if ((unsigned char *)de - base < newinfo->underflow[h])
1600 newinfo->underflow[h] -= origsize - *size;
1601 }
1602 return ret;
1603}
1604
1605static int
1606compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
1607{
1608 struct xt_entry_match *ematch;
1609 struct xt_mtchk_param mtpar;
1610 unsigned int j;
1611 int ret = 0;
1612
1613 j = 0;
1614 mtpar.net = net;
1615 mtpar.table = name;
1616 mtpar.entryinfo = &e->ip;
1617 mtpar.hook_mask = e->comefrom;
1618 mtpar.family = NFPROTO_IPV4;
1619 xt_ematch_foreach(ematch, e) {
1620 ret = check_match(ematch, &mtpar);
1621 if (ret != 0)
1622 goto cleanup_matches;
1623 ++j;
1624 }
1625
1626 ret = check_target(e, net, name);
1627 if (ret)
1628 goto cleanup_matches;
1629 return 0;
1630
1631 cleanup_matches:
1632 xt_ematch_foreach(ematch, e) {
1633 if (j-- == 0)
1634 break;
1635 cleanup_match(ematch, net);
1636 }
1637 return ret;
1638}
1639
1640static int
1641translate_compat_table(struct net *net,
1642 const char *name,
1643 unsigned int valid_hooks,
1644 struct xt_table_info **pinfo,
1645 void **pentry0,
1646 unsigned int total_size,
1647 unsigned int number,
1648 unsigned int *hook_entries,
1649 unsigned int *underflows)
1650{
1651 unsigned int i, j;
1652 struct xt_table_info *newinfo, *info;
1653 void *pos, *entry0, *entry1;
1654 struct compat_ipt_entry *iter0;
1655 struct ipt_entry *iter1;
1656 unsigned int size;
1657 int ret;
1658
1659 info = *pinfo;
1660 entry0 = *pentry0;
1661 size = total_size;
1662 info->number = number;
1663
1664
1665 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1666 info->hook_entry[i] = 0xFFFFFFFF;
1667 info->underflow[i] = 0xFFFFFFFF;
1668 }
1669
1670 duprintf("translate_compat_table: size %u\n", info->size);
1671 j = 0;
1672 xt_compat_lock(AF_INET);
1673 xt_compat_init_offsets(AF_INET, number);
1674
1675 xt_entry_foreach(iter0, entry0, total_size) {
1676 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1677 entry0,
1678 entry0 + total_size,
1679 hook_entries,
1680 underflows,
1681 name);
1682 if (ret != 0)
1683 goto out_unlock;
1684 ++j;
1685 }
1686
1687 ret = -EINVAL;
1688 if (j != number) {
1689 duprintf("translate_compat_table: %u not %u entries\n",
1690 j, number);
1691 goto out_unlock;
1692 }
1693
1694
1695 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1696
1697 if (!(valid_hooks & (1 << i)))
1698 continue;
1699 if (info->hook_entry[i] == 0xFFFFFFFF) {
1700 duprintf("Invalid hook entry %u %u\n",
1701 i, hook_entries[i]);
1702 goto out_unlock;
1703 }
1704 if (info->underflow[i] == 0xFFFFFFFF) {
1705 duprintf("Invalid underflow %u %u\n",
1706 i, underflows[i]);
1707 goto out_unlock;
1708 }
1709 }
1710
1711 ret = -ENOMEM;
1712 newinfo = xt_alloc_table_info(size);
1713 if (!newinfo)
1714 goto out_unlock;
1715
1716 newinfo->number = number;
1717 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1718 newinfo->hook_entry[i] = info->hook_entry[i];
1719 newinfo->underflow[i] = info->underflow[i];
1720 }
1721 entry1 = newinfo->entries[raw_smp_processor_id()];
1722 pos = entry1;
1723 size = total_size;
1724 xt_entry_foreach(iter0, entry0, total_size) {
1725 ret = compat_copy_entry_from_user(iter0, &pos, &size,
1726 name, newinfo, entry1);
1727 if (ret != 0)
1728 break;
1729 }
1730 xt_compat_flush_offsets(AF_INET);
1731 xt_compat_unlock(AF_INET);
1732 if (ret)
1733 goto free_newinfo;
1734
1735 ret = -ELOOP;
1736 if (!mark_source_chains(newinfo, valid_hooks, entry1))
1737 goto free_newinfo;
1738
1739 i = 0;
1740 xt_entry_foreach(iter1, entry1, newinfo->size) {
1741 ret = compat_check_entry(iter1, net, name);
1742 if (ret != 0)
1743 break;
1744 ++i;
1745 if (strcmp(ipt_get_target(iter1)->u.user.name,
1746 XT_ERROR_TARGET) == 0)
1747 ++newinfo->stacksize;
1748 }
1749 if (ret) {
1750
1751
1752
1753
1754
1755 int skip = i;
1756 j -= i;
1757 xt_entry_foreach(iter0, entry0, newinfo->size) {
1758 if (skip-- > 0)
1759 continue;
1760 if (j-- == 0)
1761 break;
1762 compat_release_entry(iter0);
1763 }
1764 xt_entry_foreach(iter1, entry1, newinfo->size) {
1765 if (i-- == 0)
1766 break;
1767 cleanup_entry(iter1, net);
1768 }
1769 xt_free_table_info(newinfo);
1770 return ret;
1771 }
1772
1773
1774 for_each_possible_cpu(i)
1775 if (newinfo->entries[i] && newinfo->entries[i] != entry1)
1776 memcpy(newinfo->entries[i], entry1, newinfo->size);
1777
1778 *pinfo = newinfo;
1779 *pentry0 = entry1;
1780 xt_free_table_info(info);
1781 return 0;
1782
1783free_newinfo:
1784 xt_free_table_info(newinfo);
1785out:
1786 xt_entry_foreach(iter0, entry0, total_size) {
1787 if (j-- == 0)
1788 break;
1789 compat_release_entry(iter0);
1790 }
1791 return ret;
1792out_unlock:
1793 xt_compat_flush_offsets(AF_INET);
1794 xt_compat_unlock(AF_INET);
1795 goto out;
1796}
1797
1798static int
1799compat_do_replace(struct net *net, void __user *user, unsigned int len)
1800{
1801 int ret;
1802 struct compat_ipt_replace tmp;
1803 struct xt_table_info *newinfo;
1804 void *loc_cpu_entry;
1805 struct ipt_entry *iter;
1806
1807 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1808 return -EFAULT;
1809
1810
1811 if (tmp.size >= INT_MAX / num_possible_cpus())
1812 return -ENOMEM;
1813 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1814 return -ENOMEM;
1815 if (tmp.num_counters == 0)
1816 return -EINVAL;
1817
1818 tmp.name[sizeof(tmp.name)-1] = 0;
1819
1820 newinfo = xt_alloc_table_info(tmp.size);
1821 if (!newinfo)
1822 return -ENOMEM;
1823
1824
1825 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1826 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1827 tmp.size) != 0) {
1828 ret = -EFAULT;
1829 goto free_newinfo;
1830 }
1831
1832 ret = translate_compat_table(net, tmp.name, tmp.valid_hooks,
1833 &newinfo, &loc_cpu_entry, tmp.size,
1834 tmp.num_entries, tmp.hook_entry,
1835 tmp.underflow);
1836 if (ret != 0)
1837 goto free_newinfo;
1838
1839 duprintf("compat_do_replace: Translated table\n");
1840
1841 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1842 tmp.num_counters, compat_ptr(tmp.counters));
1843 if (ret)
1844 goto free_newinfo_untrans;
1845 return 0;
1846
1847 free_newinfo_untrans:
1848 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1849 cleanup_entry(iter, net);
1850 free_newinfo:
1851 xt_free_table_info(newinfo);
1852 return ret;
1853}
1854
1855static int
1856compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user,
1857 unsigned int len)
1858{
1859 int ret;
1860
1861 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1862 return -EPERM;
1863
1864 switch (cmd) {
1865 case IPT_SO_SET_REPLACE:
1866 ret = compat_do_replace(sock_net(sk), user, len);
1867 break;
1868
1869 case IPT_SO_SET_ADD_COUNTERS:
1870 ret = do_add_counters(sock_net(sk), user, len, 1);
1871 break;
1872
1873 default:
1874 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
1875 ret = -EINVAL;
1876 }
1877
1878 return ret;
1879}
1880
1881struct compat_ipt_get_entries {
1882 char name[XT_TABLE_MAXNAMELEN];
1883 compat_uint_t size;
1884 struct compat_ipt_entry entrytable[0];
1885};
1886
1887static int
1888compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1889 void __user *userptr)
1890{
1891 struct xt_counters *counters;
1892 const struct xt_table_info *private = table->private;
1893 void __user *pos;
1894 unsigned int size;
1895 int ret = 0;
1896 const void *loc_cpu_entry;
1897 unsigned int i = 0;
1898 struct ipt_entry *iter;
1899
1900 counters = alloc_counters(table);
1901 if (IS_ERR(counters))
1902 return PTR_ERR(counters);
1903
1904
1905
1906
1907
1908 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1909 pos = userptr;
1910 size = total_size;
1911 xt_entry_foreach(iter, loc_cpu_entry, total_size) {
1912 ret = compat_copy_entry_to_user(iter, &pos,
1913 &size, counters, i++);
1914 if (ret != 0)
1915 break;
1916 }
1917
1918 vfree(counters);
1919 return ret;
1920}
1921
1922static int
1923compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
1924 int *len)
1925{
1926 int ret;
1927 struct compat_ipt_get_entries get;
1928 struct xt_table *t;
1929
1930 if (*len < sizeof(get)) {
1931 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1932 return -EINVAL;
1933 }
1934
1935 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1936 return -EFAULT;
1937
1938 if (*len != sizeof(struct compat_ipt_get_entries) + get.size) {
1939 duprintf("compat_get_entries: %u != %zu\n",
1940 *len, sizeof(get) + get.size);
1941 return -EINVAL;
1942 }
1943
1944 xt_compat_lock(AF_INET);
1945 t = xt_find_table_lock(net, AF_INET, get.name);
1946 if (!IS_ERR_OR_NULL(t)) {
1947 const struct xt_table_info *private = t->private;
1948 struct xt_table_info info;
1949 duprintf("t->private->number = %u\n", private->number);
1950 ret = compat_table_info(private, &info);
1951 if (!ret && get.size == info.size) {
1952 ret = compat_copy_entries_to_user(private->size,
1953 t, uptr->entrytable);
1954 } else if (!ret) {
1955 duprintf("compat_get_entries: I've got %u not %u!\n",
1956 private->size, get.size);
1957 ret = -EAGAIN;
1958 }
1959 xt_compat_flush_offsets(AF_INET);
1960 module_put(t->me);
1961 xt_table_unlock(t);
1962 } else
1963 ret = t ? PTR_ERR(t) : -ENOENT;
1964
1965 xt_compat_unlock(AF_INET);
1966 return ret;
1967}
1968
1969static int do_ipt_get_ctl(struct sock *, int, void __user *, int *);
1970
1971static int
1972compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1973{
1974 int ret;
1975
1976 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1977 return -EPERM;
1978
1979 switch (cmd) {
1980 case IPT_SO_GET_INFO:
1981 ret = get_info(sock_net(sk), user, len, 1);
1982 break;
1983 case IPT_SO_GET_ENTRIES:
1984 ret = compat_get_entries(sock_net(sk), user, len);
1985 break;
1986 default:
1987 ret = do_ipt_get_ctl(sk, cmd, user, len);
1988 }
1989 return ret;
1990}
1991#endif
1992
1993static int
1994do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1995{
1996 int ret;
1997
1998 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1999 return -EPERM;
2000
2001 switch (cmd) {
2002 case IPT_SO_SET_REPLACE:
2003 ret = do_replace(sock_net(sk), user, len);
2004 break;
2005
2006 case IPT_SO_SET_ADD_COUNTERS:
2007 ret = do_add_counters(sock_net(sk), user, len, 0);
2008 break;
2009
2010 default:
2011 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
2012 ret = -EINVAL;
2013 }
2014
2015 return ret;
2016}
2017
2018static int
2019do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2020{
2021 int ret;
2022
2023 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2024 return -EPERM;
2025
2026 switch (cmd) {
2027 case IPT_SO_GET_INFO:
2028 ret = get_info(sock_net(sk), user, len, 0);
2029 break;
2030
2031 case IPT_SO_GET_ENTRIES:
2032 ret = get_entries(sock_net(sk), user, len);
2033 break;
2034
2035 case IPT_SO_GET_REVISION_MATCH:
2036 case IPT_SO_GET_REVISION_TARGET: {
2037 struct xt_get_revision rev;
2038 int target;
2039
2040 if (*len != sizeof(rev)) {
2041 ret = -EINVAL;
2042 break;
2043 }
2044 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
2045 ret = -EFAULT;
2046 break;
2047 }
2048 rev.name[sizeof(rev.name)-1] = 0;
2049
2050 if (cmd == IPT_SO_GET_REVISION_TARGET)
2051 target = 1;
2052 else
2053 target = 0;
2054
2055 try_then_request_module(xt_find_revision(AF_INET, rev.name,
2056 rev.revision,
2057 target, &ret),
2058 "ipt_%s", rev.name);
2059 break;
2060 }
2061
2062 default:
2063 duprintf("do_ipt_get_ctl: unknown request %i\n", cmd);
2064 ret = -EINVAL;
2065 }
2066
2067 return ret;
2068}
2069
2070struct xt_table *ipt_register_table(struct net *net,
2071 const struct xt_table *table,
2072 const struct ipt_replace *repl)
2073{
2074 int ret;
2075 struct xt_table_info *newinfo;
2076 struct xt_table_info bootstrap = {0};
2077 void *loc_cpu_entry;
2078 struct xt_table *new_table;
2079
2080 newinfo = xt_alloc_table_info(repl->size);
2081 if (!newinfo) {
2082 ret = -ENOMEM;
2083 goto out;
2084 }
2085
2086
2087 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
2088 memcpy(loc_cpu_entry, repl->entries, repl->size);
2089
2090 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
2091 if (ret != 0)
2092 goto out_free;
2093
2094 new_table = xt_register_table(net, table, &bootstrap, newinfo);
2095 if (IS_ERR(new_table)) {
2096 ret = PTR_ERR(new_table);
2097 goto out_free;
2098 }
2099
2100 return new_table;
2101
2102out_free:
2103 xt_free_table_info(newinfo);
2104out:
2105 return ERR_PTR(ret);
2106}
2107
2108void ipt_unregister_table(struct net *net, struct xt_table *table)
2109{
2110 struct xt_table_info *private;
2111 void *loc_cpu_entry;
2112 struct module *table_owner = table->me;
2113 struct ipt_entry *iter;
2114
2115 private = xt_unregister_table(table);
2116
2117
2118 loc_cpu_entry = private->entries[raw_smp_processor_id()];
2119 xt_entry_foreach(iter, loc_cpu_entry, private->size)
2120 cleanup_entry(iter, net);
2121 if (private->number > private->initial_entries)
2122 module_put(table_owner);
2123 xt_free_table_info(private);
2124}
2125
2126
2127static inline bool
2128icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2129 u_int8_t type, u_int8_t code,
2130 bool invert)
2131{
2132 return ((test_type == 0xFF) ||
2133 (type == test_type && code >= min_code && code <= max_code))
2134 ^ invert;
2135}
2136
2137static bool
2138icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
2139{
2140 const struct icmphdr *ic;
2141 struct icmphdr _icmph;
2142 const struct ipt_icmp *icmpinfo = par->matchinfo;
2143
2144
2145 if (par->fragoff != 0)
2146 return false;
2147
2148 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
2149 if (ic == NULL) {
2150
2151
2152
2153 duprintf("Dropping evil ICMP tinygram.\n");
2154 par->hotdrop = true;
2155 return false;
2156 }
2157
2158 return icmp_type_code_match(icmpinfo->type,
2159 icmpinfo->code[0],
2160 icmpinfo->code[1],
2161 ic->type, ic->code,
2162 !!(icmpinfo->invflags&IPT_ICMP_INV));
2163}
2164
2165static int icmp_checkentry(const struct xt_mtchk_param *par)
2166{
2167 const struct ipt_icmp *icmpinfo = par->matchinfo;
2168
2169
2170 return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0;
2171}
2172
2173static struct xt_target ipt_builtin_tg[] __read_mostly = {
2174 {
2175 .name = XT_STANDARD_TARGET,
2176 .targetsize = sizeof(int),
2177 .family = NFPROTO_IPV4,
2178#ifdef CONFIG_COMPAT
2179 .compatsize = sizeof(compat_int_t),
2180 .compat_from_user = compat_standard_from_user,
2181 .compat_to_user = compat_standard_to_user,
2182#endif
2183 },
2184 {
2185 .name = XT_ERROR_TARGET,
2186 .target = ipt_error,
2187 .targetsize = XT_FUNCTION_MAXNAMELEN,
2188 .family = NFPROTO_IPV4,
2189 },
2190};
2191
2192static struct nf_sockopt_ops ipt_sockopts = {
2193 .pf = PF_INET,
2194 .set_optmin = IPT_BASE_CTL,
2195 .set_optmax = IPT_SO_SET_MAX+1,
2196 .set = do_ipt_set_ctl,
2197#ifdef CONFIG_COMPAT
2198 .compat_set = compat_do_ipt_set_ctl,
2199#endif
2200 .get_optmin = IPT_BASE_CTL,
2201 .get_optmax = IPT_SO_GET_MAX+1,
2202 .get = do_ipt_get_ctl,
2203#ifdef CONFIG_COMPAT
2204 .compat_get = compat_do_ipt_get_ctl,
2205#endif
2206 .owner = THIS_MODULE,
2207};
2208
2209static struct xt_match ipt_builtin_mt[] __read_mostly = {
2210 {
2211 .name = "icmp",
2212 .match = icmp_match,
2213 .matchsize = sizeof(struct ipt_icmp),
2214 .checkentry = icmp_checkentry,
2215 .proto = IPPROTO_ICMP,
2216 .family = NFPROTO_IPV4,
2217 },
2218};
2219
2220static int __net_init ip_tables_net_init(struct net *net)
2221{
2222 return xt_proto_init(net, NFPROTO_IPV4);
2223}
2224
2225static void __net_exit ip_tables_net_exit(struct net *net)
2226{
2227 xt_proto_fini(net, NFPROTO_IPV4);
2228}
2229
2230static struct pernet_operations ip_tables_net_ops = {
2231 .init = ip_tables_net_init,
2232 .exit = ip_tables_net_exit,
2233};
2234
2235static int __init ip_tables_init(void)
2236{
2237 int ret;
2238
2239 ret = register_pernet_subsys(&ip_tables_net_ops);
2240 if (ret < 0)
2241 goto err1;
2242
2243
2244 ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2245 if (ret < 0)
2246 goto err2;
2247 ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2248 if (ret < 0)
2249 goto err4;
2250
2251
2252 ret = nf_register_sockopt(&ipt_sockopts);
2253 if (ret < 0)
2254 goto err5;
2255
2256 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2257 return 0;
2258
2259err5:
2260 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2261err4:
2262 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2263err2:
2264 unregister_pernet_subsys(&ip_tables_net_ops);
2265err1:
2266 return ret;
2267}
2268
2269static void __exit ip_tables_fini(void)
2270{
2271 nf_unregister_sockopt(&ipt_sockopts);
2272
2273 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2274 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2275 unregister_pernet_subsys(&ip_tables_net_ops);
2276}
2277
2278EXPORT_SYMBOL(ipt_register_table);
2279EXPORT_SYMBOL(ipt_unregister_table);
2280EXPORT_SYMBOL(ipt_do_table);
2281module_init(ip_tables_init);
2282module_exit(ip_tables_fini);
2283