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9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/kernel.h>
13#include <linux/capability.h>
14#include <linux/in.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/poison.h>
21#include <linux/icmpv6.h>
22#include <net/ipv6.h>
23#include <net/compat.h>
24#include <linux/uaccess.h>
25#include <linux/mutex.h>
26#include <linux/proc_fs.h>
27#include <linux/err.h>
28#include <linux/cpumask.h>
29
30#include <linux/netfilter_ipv6/ip6_tables.h>
31#include <linux/netfilter/x_tables.h>
32#include <net/netfilter/nf_log.h>
33#include "../../netfilter/xt_repldata.h"
34
35MODULE_LICENSE("GPL");
36MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
37MODULE_DESCRIPTION("IPv6 packet filter");
38MODULE_ALIAS("ip6t_icmp6");
39
40void *ip6t_alloc_initial_table(const struct xt_table *info)
41{
42 return xt_alloc_initial_table(ip6t, IP6T);
43}
44EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
45
46
47
48static inline bool
49ip6_packet_match(const struct sk_buff *skb,
50 const char *indev,
51 const char *outdev,
52 const struct ip6t_ip6 *ip6info,
53 unsigned int *protoff,
54 int *fragoff, bool *hotdrop)
55{
56 unsigned long ret;
57 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
58
59 if (NF_INVF(ip6info, IP6T_INV_SRCIP,
60 ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
61 &ip6info->src)) ||
62 NF_INVF(ip6info, IP6T_INV_DSTIP,
63 ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
64 &ip6info->dst)))
65 return false;
66
67 ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
68
69 if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0))
70 return false;
71
72 ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
73
74 if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0))
75 return false;
76
77
78
79
80 if (ip6info->flags & IP6T_F_PROTO) {
81 int protohdr;
82 unsigned short _frag_off;
83
84 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL);
85 if (protohdr < 0) {
86 if (_frag_off == 0)
87 *hotdrop = true;
88 return false;
89 }
90 *fragoff = _frag_off;
91
92 if (ip6info->proto == protohdr) {
93 if (ip6info->invflags & IP6T_INV_PROTO)
94 return false;
95
96 return true;
97 }
98
99
100 if ((ip6info->proto != 0) &&
101 !(ip6info->invflags & IP6T_INV_PROTO))
102 return false;
103 }
104 return true;
105}
106
107
108static bool
109ip6_checkentry(const struct ip6t_ip6 *ipv6)
110{
111 if (ipv6->flags & ~IP6T_F_MASK)
112 return false;
113 if (ipv6->invflags & ~IP6T_INV_MASK)
114 return false;
115
116 return true;
117}
118
119static unsigned int
120ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
121{
122 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
123
124 return NF_DROP;
125}
126
127static inline struct ip6t_entry *
128get_entry(const void *base, unsigned int offset)
129{
130 return (struct ip6t_entry *)(base + offset);
131}
132
133
134
135static inline bool unconditional(const struct ip6t_entry *e)
136{
137 static const struct ip6t_ip6 uncond;
138
139 return e->target_offset == sizeof(struct ip6t_entry) &&
140 memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0;
141}
142
143static inline const struct xt_entry_target *
144ip6t_get_target_c(const struct ip6t_entry *e)
145{
146 return ip6t_get_target((struct ip6t_entry *)e);
147}
148
149#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
150
151static const char *const hooknames[] = {
152 [NF_INET_PRE_ROUTING] = "PREROUTING",
153 [NF_INET_LOCAL_IN] = "INPUT",
154 [NF_INET_FORWARD] = "FORWARD",
155 [NF_INET_LOCAL_OUT] = "OUTPUT",
156 [NF_INET_POST_ROUTING] = "POSTROUTING",
157};
158
159enum nf_ip_trace_comments {
160 NF_IP6_TRACE_COMMENT_RULE,
161 NF_IP6_TRACE_COMMENT_RETURN,
162 NF_IP6_TRACE_COMMENT_POLICY,
163};
164
165static const char *const comments[] = {
166 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
167 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
168 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
169};
170
171static const struct nf_loginfo trace_loginfo = {
172 .type = NF_LOG_TYPE_LOG,
173 .u = {
174 .log = {
175 .level = LOGLEVEL_WARNING,
176 .logflags = NF_LOG_DEFAULT_MASK,
177 },
178 },
179};
180
181
182static inline int
183get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
184 const char *hookname, const char **chainname,
185 const char **comment, unsigned int *rulenum)
186{
187 const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
188
189 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
190
191 *chainname = t->target.data;
192 (*rulenum) = 0;
193 } else if (s == e) {
194 (*rulenum)++;
195
196 if (unconditional(s) &&
197 strcmp(t->target.u.kernel.target->name,
198 XT_STANDARD_TARGET) == 0 &&
199 t->verdict < 0) {
200
201 *comment = *chainname == hookname
202 ? comments[NF_IP6_TRACE_COMMENT_POLICY]
203 : comments[NF_IP6_TRACE_COMMENT_RETURN];
204 }
205 return 1;
206 } else
207 (*rulenum)++;
208
209 return 0;
210}
211
212static void trace_packet(struct net *net,
213 const struct sk_buff *skb,
214 unsigned int hook,
215 const struct net_device *in,
216 const struct net_device *out,
217 const char *tablename,
218 const struct xt_table_info *private,
219 const struct ip6t_entry *e)
220{
221 const struct ip6t_entry *root;
222 const char *hookname, *chainname, *comment;
223 const struct ip6t_entry *iter;
224 unsigned int rulenum = 0;
225
226 root = get_entry(private->entries, private->hook_entry[hook]);
227
228 hookname = chainname = hooknames[hook];
229 comment = comments[NF_IP6_TRACE_COMMENT_RULE];
230
231 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
232 if (get_chainname_rulenum(iter, e, hookname,
233 &chainname, &comment, &rulenum) != 0)
234 break;
235
236 nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
237 "TRACE: %s:%s:%s:%u ",
238 tablename, chainname, comment, rulenum);
239}
240#endif
241
242static inline struct ip6t_entry *
243ip6t_next_entry(const struct ip6t_entry *entry)
244{
245 return (void *)entry + entry->next_offset;
246}
247
248
249unsigned int
250ip6t_do_table(struct sk_buff *skb,
251 const struct nf_hook_state *state,
252 struct xt_table *table)
253{
254 unsigned int hook = state->hook;
255 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
256
257 unsigned int verdict = NF_DROP;
258 const char *indev, *outdev;
259 const void *table_base;
260 struct ip6t_entry *e, **jumpstack;
261 unsigned int stackidx, cpu;
262 const struct xt_table_info *private;
263 struct xt_action_param acpar;
264 unsigned int addend;
265
266
267 stackidx = 0;
268 indev = state->in ? state->in->name : nulldevname;
269 outdev = state->out ? state->out->name : nulldevname;
270
271
272
273
274
275
276 acpar.hotdrop = false;
277 acpar.state = state;
278
279 WARN_ON(!(table->valid_hooks & (1 << hook)));
280
281 local_bh_disable();
282 addend = xt_write_recseq_begin();
283 private = READ_ONCE(table->private);
284 cpu = smp_processor_id();
285 table_base = private->entries;
286 jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
287
288
289
290
291
292
293
294
295 if (static_key_false(&xt_tee_enabled))
296 jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
297
298 e = get_entry(table_base, private->hook_entry[hook]);
299
300 do {
301 const struct xt_entry_target *t;
302 const struct xt_entry_match *ematch;
303 struct xt_counters *counter;
304
305 WARN_ON(!e);
306 acpar.thoff = 0;
307 if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
308 &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
309 no_match:
310 e = ip6t_next_entry(e);
311 continue;
312 }
313
314 xt_ematch_foreach(ematch, e) {
315 acpar.match = ematch->u.kernel.match;
316 acpar.matchinfo = ematch->data;
317 if (!acpar.match->match(skb, &acpar))
318 goto no_match;
319 }
320
321 counter = xt_get_this_cpu_counter(&e->counters);
322 ADD_COUNTER(*counter, skb->len, 1);
323
324 t = ip6t_get_target_c(e);
325 WARN_ON(!t->u.kernel.target);
326
327#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
328
329 if (unlikely(skb->nf_trace))
330 trace_packet(state->net, skb, hook, state->in,
331 state->out, table->name, private, e);
332#endif
333
334 if (!t->u.kernel.target->target) {
335 int v;
336
337 v = ((struct xt_standard_target *)t)->verdict;
338 if (v < 0) {
339
340 if (v != XT_RETURN) {
341 verdict = (unsigned int)(-v) - 1;
342 break;
343 }
344 if (stackidx == 0)
345 e = get_entry(table_base,
346 private->underflow[hook]);
347 else
348 e = ip6t_next_entry(jumpstack[--stackidx]);
349 continue;
350 }
351 if (table_base + v != ip6t_next_entry(e) &&
352 !(e->ipv6.flags & IP6T_F_GOTO)) {
353 if (unlikely(stackidx >= private->stacksize)) {
354 verdict = NF_DROP;
355 break;
356 }
357 jumpstack[stackidx++] = e;
358 }
359
360 e = get_entry(table_base, v);
361 continue;
362 }
363
364 acpar.target = t->u.kernel.target;
365 acpar.targinfo = t->data;
366
367 verdict = t->u.kernel.target->target(skb, &acpar);
368 if (verdict == XT_CONTINUE)
369 e = ip6t_next_entry(e);
370 else
371
372 break;
373 } while (!acpar.hotdrop);
374
375 xt_write_recseq_end(addend);
376 local_bh_enable();
377
378 if (acpar.hotdrop)
379 return NF_DROP;
380 else return verdict;
381}
382
383
384
385static int
386mark_source_chains(const struct xt_table_info *newinfo,
387 unsigned int valid_hooks, void *entry0,
388 unsigned int *offsets)
389{
390 unsigned int hook;
391
392
393
394 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
395 unsigned int pos = newinfo->hook_entry[hook];
396 struct ip6t_entry *e = entry0 + pos;
397
398 if (!(valid_hooks & (1 << hook)))
399 continue;
400
401
402 e->counters.pcnt = pos;
403
404 for (;;) {
405 const struct xt_standard_target *t
406 = (void *)ip6t_get_target_c(e);
407 int visited = e->comefrom & (1 << hook);
408
409 if (e->comefrom & (1 << NF_INET_NUMHOOKS))
410 return 0;
411
412 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
413
414
415 if ((unconditional(e) &&
416 (strcmp(t->target.u.user.name,
417 XT_STANDARD_TARGET) == 0) &&
418 t->verdict < 0) || visited) {
419 unsigned int oldpos, size;
420
421
422
423 do {
424 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
425 oldpos = pos;
426 pos = e->counters.pcnt;
427 e->counters.pcnt = 0;
428
429
430 if (pos == oldpos)
431 goto next;
432
433 e = entry0 + pos;
434 } while (oldpos == pos + e->next_offset);
435
436
437 size = e->next_offset;
438 e = entry0 + pos + size;
439 if (pos + size >= newinfo->size)
440 return 0;
441 e->counters.pcnt = pos;
442 pos += size;
443 } else {
444 int newpos = t->verdict;
445
446 if (strcmp(t->target.u.user.name,
447 XT_STANDARD_TARGET) == 0 &&
448 newpos >= 0) {
449
450 if (!xt_find_jump_offset(offsets, newpos,
451 newinfo->number))
452 return 0;
453 } else {
454
455 newpos = pos + e->next_offset;
456 if (newpos >= newinfo->size)
457 return 0;
458 }
459 e = entry0 + newpos;
460 e->counters.pcnt = pos;
461 pos = newpos;
462 }
463 }
464next: ;
465 }
466 return 1;
467}
468
469static void cleanup_match(struct xt_entry_match *m, struct net *net)
470{
471 struct xt_mtdtor_param par;
472
473 par.net = net;
474 par.match = m->u.kernel.match;
475 par.matchinfo = m->data;
476 par.family = NFPROTO_IPV6;
477 if (par.match->destroy != NULL)
478 par.match->destroy(&par);
479 module_put(par.match->me);
480}
481
482static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
483{
484 const struct ip6t_ip6 *ipv6 = par->entryinfo;
485
486 par->match = m->u.kernel.match;
487 par->matchinfo = m->data;
488
489 return xt_check_match(par, m->u.match_size - sizeof(*m),
490 ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
491}
492
493static int
494find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
495{
496 struct xt_match *match;
497 int ret;
498
499 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
500 m->u.user.revision);
501 if (IS_ERR(match))
502 return PTR_ERR(match);
503
504 m->u.kernel.match = match;
505
506 ret = check_match(m, par);
507 if (ret)
508 goto err;
509
510 return 0;
511err:
512 module_put(m->u.kernel.match->me);
513 return ret;
514}
515
516static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
517{
518 struct xt_entry_target *t = ip6t_get_target(e);
519 struct xt_tgchk_param par = {
520 .net = net,
521 .table = name,
522 .entryinfo = e,
523 .target = t->u.kernel.target,
524 .targinfo = t->data,
525 .hook_mask = e->comefrom,
526 .family = NFPROTO_IPV6,
527 };
528
529 return xt_check_target(&par, t->u.target_size - sizeof(*t),
530 e->ipv6.proto,
531 e->ipv6.invflags & IP6T_INV_PROTO);
532}
533
534static int
535find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
536 unsigned int size,
537 struct xt_percpu_counter_alloc_state *alloc_state)
538{
539 struct xt_entry_target *t;
540 struct xt_target *target;
541 int ret;
542 unsigned int j;
543 struct xt_mtchk_param mtpar;
544 struct xt_entry_match *ematch;
545
546 if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
547 return -ENOMEM;
548
549 j = 0;
550 memset(&mtpar, 0, sizeof(mtpar));
551 mtpar.net = net;
552 mtpar.table = name;
553 mtpar.entryinfo = &e->ipv6;
554 mtpar.hook_mask = e->comefrom;
555 mtpar.family = NFPROTO_IPV6;
556 xt_ematch_foreach(ematch, e) {
557 ret = find_check_match(ematch, &mtpar);
558 if (ret != 0)
559 goto cleanup_matches;
560 ++j;
561 }
562
563 t = ip6t_get_target(e);
564 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
565 t->u.user.revision);
566 if (IS_ERR(target)) {
567 ret = PTR_ERR(target);
568 goto cleanup_matches;
569 }
570 t->u.kernel.target = target;
571
572 ret = check_target(e, net, name);
573 if (ret)
574 goto err;
575 return 0;
576 err:
577 module_put(t->u.kernel.target->me);
578 cleanup_matches:
579 xt_ematch_foreach(ematch, e) {
580 if (j-- == 0)
581 break;
582 cleanup_match(ematch, net);
583 }
584
585 xt_percpu_counter_free(&e->counters);
586
587 return ret;
588}
589
590static bool check_underflow(const struct ip6t_entry *e)
591{
592 const struct xt_entry_target *t;
593 unsigned int verdict;
594
595 if (!unconditional(e))
596 return false;
597 t = ip6t_get_target_c(e);
598 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
599 return false;
600 verdict = ((struct xt_standard_target *)t)->verdict;
601 verdict = -verdict - 1;
602 return verdict == NF_DROP || verdict == NF_ACCEPT;
603}
604
605static int
606check_entry_size_and_hooks(struct ip6t_entry *e,
607 struct xt_table_info *newinfo,
608 const unsigned char *base,
609 const unsigned char *limit,
610 const unsigned int *hook_entries,
611 const unsigned int *underflows,
612 unsigned int valid_hooks)
613{
614 unsigned int h;
615 int err;
616
617 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
618 (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
619 (unsigned char *)e + e->next_offset > limit)
620 return -EINVAL;
621
622 if (e->next_offset
623 < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target))
624 return -EINVAL;
625
626 if (!ip6_checkentry(&e->ipv6))
627 return -EINVAL;
628
629 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
630 e->next_offset);
631 if (err)
632 return err;
633
634
635 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
636 if (!(valid_hooks & (1 << h)))
637 continue;
638 if ((unsigned char *)e - base == hook_entries[h])
639 newinfo->hook_entry[h] = hook_entries[h];
640 if ((unsigned char *)e - base == underflows[h]) {
641 if (!check_underflow(e))
642 return -EINVAL;
643
644 newinfo->underflow[h] = underflows[h];
645 }
646 }
647
648
649 e->counters = ((struct xt_counters) { 0, 0 });
650 e->comefrom = 0;
651 return 0;
652}
653
654static void cleanup_entry(struct ip6t_entry *e, struct net *net)
655{
656 struct xt_tgdtor_param par;
657 struct xt_entry_target *t;
658 struct xt_entry_match *ematch;
659
660
661 xt_ematch_foreach(ematch, e)
662 cleanup_match(ematch, net);
663 t = ip6t_get_target(e);
664
665 par.net = net;
666 par.target = t->u.kernel.target;
667 par.targinfo = t->data;
668 par.family = NFPROTO_IPV6;
669 if (par.target->destroy != NULL)
670 par.target->destroy(&par);
671 module_put(par.target->me);
672 xt_percpu_counter_free(&e->counters);
673}
674
675
676
677static int
678translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
679 const struct ip6t_replace *repl)
680{
681 struct xt_percpu_counter_alloc_state alloc_state = { 0 };
682 struct ip6t_entry *iter;
683 unsigned int *offsets;
684 unsigned int i;
685 int ret = 0;
686
687 newinfo->size = repl->size;
688 newinfo->number = repl->num_entries;
689
690
691 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
692 newinfo->hook_entry[i] = 0xFFFFFFFF;
693 newinfo->underflow[i] = 0xFFFFFFFF;
694 }
695
696 offsets = xt_alloc_entry_offsets(newinfo->number);
697 if (!offsets)
698 return -ENOMEM;
699 i = 0;
700
701 xt_entry_foreach(iter, entry0, newinfo->size) {
702 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
703 entry0 + repl->size,
704 repl->hook_entry,
705 repl->underflow,
706 repl->valid_hooks);
707 if (ret != 0)
708 goto out_free;
709 if (i < repl->num_entries)
710 offsets[i] = (void *)iter - entry0;
711 ++i;
712 if (strcmp(ip6t_get_target(iter)->u.user.name,
713 XT_ERROR_TARGET) == 0)
714 ++newinfo->stacksize;
715 }
716
717 ret = -EINVAL;
718 if (i != repl->num_entries)
719 goto out_free;
720
721 ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
722 if (ret)
723 goto out_free;
724
725 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
726 ret = -ELOOP;
727 goto out_free;
728 }
729 kvfree(offsets);
730
731
732 i = 0;
733 xt_entry_foreach(iter, entry0, newinfo->size) {
734 ret = find_check_entry(iter, net, repl->name, repl->size,
735 &alloc_state);
736 if (ret != 0)
737 break;
738 ++i;
739 }
740
741 if (ret != 0) {
742 xt_entry_foreach(iter, entry0, newinfo->size) {
743 if (i-- == 0)
744 break;
745 cleanup_entry(iter, net);
746 }
747 return ret;
748 }
749
750 return ret;
751 out_free:
752 kvfree(offsets);
753 return ret;
754}
755
756static void
757get_counters(const struct xt_table_info *t,
758 struct xt_counters counters[])
759{
760 struct ip6t_entry *iter;
761 unsigned int cpu;
762 unsigned int i;
763
764 for_each_possible_cpu(cpu) {
765 seqcount_t *s = &per_cpu(xt_recseq, cpu);
766
767 i = 0;
768 xt_entry_foreach(iter, t->entries, t->size) {
769 struct xt_counters *tmp;
770 u64 bcnt, pcnt;
771 unsigned int start;
772
773 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
774 do {
775 start = read_seqcount_begin(s);
776 bcnt = tmp->bcnt;
777 pcnt = tmp->pcnt;
778 } while (read_seqcount_retry(s, start));
779
780 ADD_COUNTER(counters[i], bcnt, pcnt);
781 ++i;
782 cond_resched();
783 }
784 }
785}
786
787static void get_old_counters(const struct xt_table_info *t,
788 struct xt_counters counters[])
789{
790 struct ip6t_entry *iter;
791 unsigned int cpu, i;
792
793 for_each_possible_cpu(cpu) {
794 i = 0;
795 xt_entry_foreach(iter, t->entries, t->size) {
796 const struct xt_counters *tmp;
797
798 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
799 ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt);
800 ++i;
801 }
802 cond_resched();
803 }
804}
805
806static struct xt_counters *alloc_counters(const struct xt_table *table)
807{
808 unsigned int countersize;
809 struct xt_counters *counters;
810 const struct xt_table_info *private = table->private;
811
812
813
814
815 countersize = sizeof(struct xt_counters) * private->number;
816 counters = vzalloc(countersize);
817
818 if (counters == NULL)
819 return ERR_PTR(-ENOMEM);
820
821 get_counters(private, counters);
822
823 return counters;
824}
825
826static int
827copy_entries_to_user(unsigned int total_size,
828 const struct xt_table *table,
829 void __user *userptr)
830{
831 unsigned int off, num;
832 const struct ip6t_entry *e;
833 struct xt_counters *counters;
834 const struct xt_table_info *private = table->private;
835 int ret = 0;
836 const void *loc_cpu_entry;
837
838 counters = alloc_counters(table);
839 if (IS_ERR(counters))
840 return PTR_ERR(counters);
841
842 loc_cpu_entry = private->entries;
843
844
845
846 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
847 unsigned int i;
848 const struct xt_entry_match *m;
849 const struct xt_entry_target *t;
850
851 e = loc_cpu_entry + off;
852 if (copy_to_user(userptr + off, e, sizeof(*e))) {
853 ret = -EFAULT;
854 goto free_counters;
855 }
856 if (copy_to_user(userptr + off
857 + offsetof(struct ip6t_entry, counters),
858 &counters[num],
859 sizeof(counters[num])) != 0) {
860 ret = -EFAULT;
861 goto free_counters;
862 }
863
864 for (i = sizeof(struct ip6t_entry);
865 i < e->target_offset;
866 i += m->u.match_size) {
867 m = (void *)e + i;
868
869 if (xt_match_to_user(m, userptr + off + i)) {
870 ret = -EFAULT;
871 goto free_counters;
872 }
873 }
874
875 t = ip6t_get_target_c(e);
876 if (xt_target_to_user(t, userptr + off + e->target_offset)) {
877 ret = -EFAULT;
878 goto free_counters;
879 }
880 }
881
882 free_counters:
883 vfree(counters);
884 return ret;
885}
886
887#ifdef CONFIG_COMPAT
888static void compat_standard_from_user(void *dst, const void *src)
889{
890 int v = *(compat_int_t *)src;
891
892 if (v > 0)
893 v += xt_compat_calc_jump(AF_INET6, v);
894 memcpy(dst, &v, sizeof(v));
895}
896
897static int compat_standard_to_user(void __user *dst, const void *src)
898{
899 compat_int_t cv = *(int *)src;
900
901 if (cv > 0)
902 cv -= xt_compat_calc_jump(AF_INET6, cv);
903 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
904}
905
906static int compat_calc_entry(const struct ip6t_entry *e,
907 const struct xt_table_info *info,
908 const void *base, struct xt_table_info *newinfo)
909{
910 const struct xt_entry_match *ematch;
911 const struct xt_entry_target *t;
912 unsigned int entry_offset;
913 int off, i, ret;
914
915 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
916 entry_offset = (void *)e - base;
917 xt_ematch_foreach(ematch, e)
918 off += xt_compat_match_offset(ematch->u.kernel.match);
919 t = ip6t_get_target_c(e);
920 off += xt_compat_target_offset(t->u.kernel.target);
921 newinfo->size -= off;
922 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
923 if (ret)
924 return ret;
925
926 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
927 if (info->hook_entry[i] &&
928 (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
929 newinfo->hook_entry[i] -= off;
930 if (info->underflow[i] &&
931 (e < (struct ip6t_entry *)(base + info->underflow[i])))
932 newinfo->underflow[i] -= off;
933 }
934 return 0;
935}
936
937static int compat_table_info(const struct xt_table_info *info,
938 struct xt_table_info *newinfo)
939{
940 struct ip6t_entry *iter;
941 const void *loc_cpu_entry;
942 int ret;
943
944 if (!newinfo || !info)
945 return -EINVAL;
946
947
948 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
949 newinfo->initial_entries = 0;
950 loc_cpu_entry = info->entries;
951 ret = xt_compat_init_offsets(AF_INET6, info->number);
952 if (ret)
953 return ret;
954 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
955 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
956 if (ret != 0)
957 return ret;
958 }
959 return 0;
960}
961#endif
962
963static int get_info(struct net *net, void __user *user,
964 const int *len, int compat)
965{
966 char name[XT_TABLE_MAXNAMELEN];
967 struct xt_table *t;
968 int ret;
969
970 if (*len != sizeof(struct ip6t_getinfo))
971 return -EINVAL;
972
973 if (copy_from_user(name, user, sizeof(name)) != 0)
974 return -EFAULT;
975
976 name[XT_TABLE_MAXNAMELEN-1] = '\0';
977#ifdef CONFIG_COMPAT
978 if (compat)
979 xt_compat_lock(AF_INET6);
980#endif
981 t = xt_request_find_table_lock(net, AF_INET6, name);
982 if (!IS_ERR(t)) {
983 struct ip6t_getinfo info;
984 const struct xt_table_info *private = t->private;
985#ifdef CONFIG_COMPAT
986 struct xt_table_info tmp;
987
988 if (compat) {
989 ret = compat_table_info(private, &tmp);
990 xt_compat_flush_offsets(AF_INET6);
991 private = &tmp;
992 }
993#endif
994 memset(&info, 0, sizeof(info));
995 info.valid_hooks = t->valid_hooks;
996 memcpy(info.hook_entry, private->hook_entry,
997 sizeof(info.hook_entry));
998 memcpy(info.underflow, private->underflow,
999 sizeof(info.underflow));
1000 info.num_entries = private->number;
1001 info.size = private->size;
1002 strcpy(info.name, name);
1003
1004 if (copy_to_user(user, &info, *len) != 0)
1005 ret = -EFAULT;
1006 else
1007 ret = 0;
1008
1009 xt_table_unlock(t);
1010 module_put(t->me);
1011 } else
1012 ret = PTR_ERR(t);
1013#ifdef CONFIG_COMPAT
1014 if (compat)
1015 xt_compat_unlock(AF_INET6);
1016#endif
1017 return ret;
1018}
1019
1020static int
1021get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
1022 const int *len)
1023{
1024 int ret;
1025 struct ip6t_get_entries get;
1026 struct xt_table *t;
1027
1028 if (*len < sizeof(get))
1029 return -EINVAL;
1030 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1031 return -EFAULT;
1032 if (*len != sizeof(struct ip6t_get_entries) + get.size)
1033 return -EINVAL;
1034
1035 get.name[sizeof(get.name) - 1] = '\0';
1036
1037 t = xt_find_table_lock(net, AF_INET6, get.name);
1038 if (!IS_ERR(t)) {
1039 struct xt_table_info *private = t->private;
1040 if (get.size == private->size)
1041 ret = copy_entries_to_user(private->size,
1042 t, uptr->entrytable);
1043 else
1044 ret = -EAGAIN;
1045
1046 module_put(t->me);
1047 xt_table_unlock(t);
1048 } else
1049 ret = PTR_ERR(t);
1050
1051 return ret;
1052}
1053
1054static int
1055__do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1056 struct xt_table_info *newinfo, unsigned int num_counters,
1057 void __user *counters_ptr)
1058{
1059 int ret;
1060 struct xt_table *t;
1061 struct xt_table_info *oldinfo;
1062 struct xt_counters *counters;
1063 struct ip6t_entry *iter;
1064
1065 ret = 0;
1066 counters = xt_counters_alloc(num_counters);
1067 if (!counters) {
1068 ret = -ENOMEM;
1069 goto out;
1070 }
1071
1072 t = xt_request_find_table_lock(net, AF_INET6, name);
1073 if (IS_ERR(t)) {
1074 ret = PTR_ERR(t);
1075 goto free_newinfo_counters_untrans;
1076 }
1077
1078
1079 if (valid_hooks != t->valid_hooks) {
1080 ret = -EINVAL;
1081 goto put_module;
1082 }
1083
1084 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1085 if (!oldinfo)
1086 goto put_module;
1087
1088
1089 if ((oldinfo->number > oldinfo->initial_entries) ||
1090 (newinfo->number <= oldinfo->initial_entries))
1091 module_put(t->me);
1092 if ((oldinfo->number > oldinfo->initial_entries) &&
1093 (newinfo->number <= oldinfo->initial_entries))
1094 module_put(t->me);
1095
1096 xt_table_unlock(t);
1097
1098 get_old_counters(oldinfo, counters);
1099
1100
1101 xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
1102 cleanup_entry(iter, net);
1103
1104 xt_free_table_info(oldinfo);
1105 if (copy_to_user(counters_ptr, counters,
1106 sizeof(struct xt_counters) * num_counters) != 0) {
1107
1108 net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n");
1109 }
1110 vfree(counters);
1111 return ret;
1112
1113 put_module:
1114 module_put(t->me);
1115 xt_table_unlock(t);
1116 free_newinfo_counters_untrans:
1117 vfree(counters);
1118 out:
1119 return ret;
1120}
1121
1122static int
1123do_replace(struct net *net, const void __user *user, unsigned int len)
1124{
1125 int ret;
1126 struct ip6t_replace tmp;
1127 struct xt_table_info *newinfo;
1128 void *loc_cpu_entry;
1129 struct ip6t_entry *iter;
1130
1131 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1132 return -EFAULT;
1133
1134
1135 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1136 return -ENOMEM;
1137 if (tmp.num_counters == 0)
1138 return -EINVAL;
1139
1140 tmp.name[sizeof(tmp.name)-1] = 0;
1141
1142 newinfo = xt_alloc_table_info(tmp.size);
1143 if (!newinfo)
1144 return -ENOMEM;
1145
1146 loc_cpu_entry = newinfo->entries;
1147 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1148 tmp.size) != 0) {
1149 ret = -EFAULT;
1150 goto free_newinfo;
1151 }
1152
1153 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1154 if (ret != 0)
1155 goto free_newinfo;
1156
1157 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1158 tmp.num_counters, tmp.counters);
1159 if (ret)
1160 goto free_newinfo_untrans;
1161 return 0;
1162
1163 free_newinfo_untrans:
1164 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1165 cleanup_entry(iter, net);
1166 free_newinfo:
1167 xt_free_table_info(newinfo);
1168 return ret;
1169}
1170
1171static int
1172do_add_counters(struct net *net, const void __user *user, unsigned int len,
1173 int compat)
1174{
1175 unsigned int i;
1176 struct xt_counters_info tmp;
1177 struct xt_counters *paddc;
1178 struct xt_table *t;
1179 const struct xt_table_info *private;
1180 int ret = 0;
1181 struct ip6t_entry *iter;
1182 unsigned int addend;
1183
1184 paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
1185 if (IS_ERR(paddc))
1186 return PTR_ERR(paddc);
1187 t = xt_find_table_lock(net, AF_INET6, tmp.name);
1188 if (IS_ERR(t)) {
1189 ret = PTR_ERR(t);
1190 goto free;
1191 }
1192
1193 local_bh_disable();
1194 private = t->private;
1195 if (private->number != tmp.num_counters) {
1196 ret = -EINVAL;
1197 goto unlock_up_free;
1198 }
1199
1200 i = 0;
1201 addend = xt_write_recseq_begin();
1202 xt_entry_foreach(iter, private->entries, private->size) {
1203 struct xt_counters *tmp;
1204
1205 tmp = xt_get_this_cpu_counter(&iter->counters);
1206 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1207 ++i;
1208 }
1209 xt_write_recseq_end(addend);
1210 unlock_up_free:
1211 local_bh_enable();
1212 xt_table_unlock(t);
1213 module_put(t->me);
1214 free:
1215 vfree(paddc);
1216
1217 return ret;
1218}
1219
1220#ifdef CONFIG_COMPAT
1221struct compat_ip6t_replace {
1222 char name[XT_TABLE_MAXNAMELEN];
1223 u32 valid_hooks;
1224 u32 num_entries;
1225 u32 size;
1226 u32 hook_entry[NF_INET_NUMHOOKS];
1227 u32 underflow[NF_INET_NUMHOOKS];
1228 u32 num_counters;
1229 compat_uptr_t counters;
1230 struct compat_ip6t_entry entries[0];
1231};
1232
1233static int
1234compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
1235 unsigned int *size, struct xt_counters *counters,
1236 unsigned int i)
1237{
1238 struct xt_entry_target *t;
1239 struct compat_ip6t_entry __user *ce;
1240 u_int16_t target_offset, next_offset;
1241 compat_uint_t origsize;
1242 const struct xt_entry_match *ematch;
1243 int ret = 0;
1244
1245 origsize = *size;
1246 ce = *dstptr;
1247 if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
1248 copy_to_user(&ce->counters, &counters[i],
1249 sizeof(counters[i])) != 0)
1250 return -EFAULT;
1251
1252 *dstptr += sizeof(struct compat_ip6t_entry);
1253 *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1254
1255 xt_ematch_foreach(ematch, e) {
1256 ret = xt_compat_match_to_user(ematch, dstptr, size);
1257 if (ret != 0)
1258 return ret;
1259 }
1260 target_offset = e->target_offset - (origsize - *size);
1261 t = ip6t_get_target(e);
1262 ret = xt_compat_target_to_user(t, dstptr, size);
1263 if (ret)
1264 return ret;
1265 next_offset = e->next_offset - (origsize - *size);
1266 if (put_user(target_offset, &ce->target_offset) != 0 ||
1267 put_user(next_offset, &ce->next_offset) != 0)
1268 return -EFAULT;
1269 return 0;
1270}
1271
1272static int
1273compat_find_calc_match(struct xt_entry_match *m,
1274 const struct ip6t_ip6 *ipv6,
1275 int *size)
1276{
1277 struct xt_match *match;
1278
1279 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
1280 m->u.user.revision);
1281 if (IS_ERR(match))
1282 return PTR_ERR(match);
1283
1284 m->u.kernel.match = match;
1285 *size += xt_compat_match_offset(match);
1286 return 0;
1287}
1288
1289static void compat_release_entry(struct compat_ip6t_entry *e)
1290{
1291 struct xt_entry_target *t;
1292 struct xt_entry_match *ematch;
1293
1294
1295 xt_ematch_foreach(ematch, e)
1296 module_put(ematch->u.kernel.match->me);
1297 t = compat_ip6t_get_target(e);
1298 module_put(t->u.kernel.target->me);
1299}
1300
1301static int
1302check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
1303 struct xt_table_info *newinfo,
1304 unsigned int *size,
1305 const unsigned char *base,
1306 const unsigned char *limit)
1307{
1308 struct xt_entry_match *ematch;
1309 struct xt_entry_target *t;
1310 struct xt_target *target;
1311 unsigned int entry_offset;
1312 unsigned int j;
1313 int ret, off;
1314
1315 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1316 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
1317 (unsigned char *)e + e->next_offset > limit)
1318 return -EINVAL;
1319
1320 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1321 sizeof(struct compat_xt_entry_target))
1322 return -EINVAL;
1323
1324 if (!ip6_checkentry(&e->ipv6))
1325 return -EINVAL;
1326
1327 ret = xt_compat_check_entry_offsets(e, e->elems,
1328 e->target_offset, e->next_offset);
1329 if (ret)
1330 return ret;
1331
1332 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1333 entry_offset = (void *)e - (void *)base;
1334 j = 0;
1335 xt_ematch_foreach(ematch, e) {
1336 ret = compat_find_calc_match(ematch, &e->ipv6, &off);
1337 if (ret != 0)
1338 goto release_matches;
1339 ++j;
1340 }
1341
1342 t = compat_ip6t_get_target(e);
1343 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1344 t->u.user.revision);
1345 if (IS_ERR(target)) {
1346 ret = PTR_ERR(target);
1347 goto release_matches;
1348 }
1349 t->u.kernel.target = target;
1350
1351 off += xt_compat_target_offset(target);
1352 *size += off;
1353 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1354 if (ret)
1355 goto out;
1356
1357 return 0;
1358
1359out:
1360 module_put(t->u.kernel.target->me);
1361release_matches:
1362 xt_ematch_foreach(ematch, e) {
1363 if (j-- == 0)
1364 break;
1365 module_put(ematch->u.kernel.match->me);
1366 }
1367 return ret;
1368}
1369
1370static void
1371compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1372 unsigned int *size,
1373 struct xt_table_info *newinfo, unsigned char *base)
1374{
1375 struct xt_entry_target *t;
1376 struct ip6t_entry *de;
1377 unsigned int origsize;
1378 int h;
1379 struct xt_entry_match *ematch;
1380
1381 origsize = *size;
1382 de = *dstptr;
1383 memcpy(de, e, sizeof(struct ip6t_entry));
1384 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1385
1386 *dstptr += sizeof(struct ip6t_entry);
1387 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1388
1389 xt_ematch_foreach(ematch, e)
1390 xt_compat_match_from_user(ematch, dstptr, size);
1391
1392 de->target_offset = e->target_offset - (origsize - *size);
1393 t = compat_ip6t_get_target(e);
1394 xt_compat_target_from_user(t, dstptr, size);
1395
1396 de->next_offset = e->next_offset - (origsize - *size);
1397 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1398 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1399 newinfo->hook_entry[h] -= origsize - *size;
1400 if ((unsigned char *)de - base < newinfo->underflow[h])
1401 newinfo->underflow[h] -= origsize - *size;
1402 }
1403}
1404
1405static int
1406translate_compat_table(struct net *net,
1407 struct xt_table_info **pinfo,
1408 void **pentry0,
1409 const struct compat_ip6t_replace *compatr)
1410{
1411 unsigned int i, j;
1412 struct xt_table_info *newinfo, *info;
1413 void *pos, *entry0, *entry1;
1414 struct compat_ip6t_entry *iter0;
1415 struct ip6t_replace repl;
1416 unsigned int size;
1417 int ret;
1418
1419 info = *pinfo;
1420 entry0 = *pentry0;
1421 size = compatr->size;
1422 info->number = compatr->num_entries;
1423
1424 j = 0;
1425 xt_compat_lock(AF_INET6);
1426 ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries);
1427 if (ret)
1428 goto out_unlock;
1429
1430 xt_entry_foreach(iter0, entry0, compatr->size) {
1431 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1432 entry0,
1433 entry0 + compatr->size);
1434 if (ret != 0)
1435 goto out_unlock;
1436 ++j;
1437 }
1438
1439 ret = -EINVAL;
1440 if (j != compatr->num_entries)
1441 goto out_unlock;
1442
1443 ret = -ENOMEM;
1444 newinfo = xt_alloc_table_info(size);
1445 if (!newinfo)
1446 goto out_unlock;
1447
1448 newinfo->number = compatr->num_entries;
1449 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1450 newinfo->hook_entry[i] = compatr->hook_entry[i];
1451 newinfo->underflow[i] = compatr->underflow[i];
1452 }
1453 entry1 = newinfo->entries;
1454 pos = entry1;
1455 size = compatr->size;
1456 xt_entry_foreach(iter0, entry0, compatr->size)
1457 compat_copy_entry_from_user(iter0, &pos, &size,
1458 newinfo, entry1);
1459
1460
1461 xt_compat_flush_offsets(AF_INET6);
1462 xt_compat_unlock(AF_INET6);
1463
1464 memcpy(&repl, compatr, sizeof(*compatr));
1465
1466 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1467 repl.hook_entry[i] = newinfo->hook_entry[i];
1468 repl.underflow[i] = newinfo->underflow[i];
1469 }
1470
1471 repl.num_counters = 0;
1472 repl.counters = NULL;
1473 repl.size = newinfo->size;
1474 ret = translate_table(net, newinfo, entry1, &repl);
1475 if (ret)
1476 goto free_newinfo;
1477
1478 *pinfo = newinfo;
1479 *pentry0 = entry1;
1480 xt_free_table_info(info);
1481 return 0;
1482
1483free_newinfo:
1484 xt_free_table_info(newinfo);
1485 return ret;
1486out_unlock:
1487 xt_compat_flush_offsets(AF_INET6);
1488 xt_compat_unlock(AF_INET6);
1489 xt_entry_foreach(iter0, entry0, compatr->size) {
1490 if (j-- == 0)
1491 break;
1492 compat_release_entry(iter0);
1493 }
1494 return ret;
1495}
1496
1497static int
1498compat_do_replace(struct net *net, void __user *user, unsigned int len)
1499{
1500 int ret;
1501 struct compat_ip6t_replace tmp;
1502 struct xt_table_info *newinfo;
1503 void *loc_cpu_entry;
1504 struct ip6t_entry *iter;
1505
1506 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1507 return -EFAULT;
1508
1509
1510 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1511 return -ENOMEM;
1512 if (tmp.num_counters == 0)
1513 return -EINVAL;
1514
1515 tmp.name[sizeof(tmp.name)-1] = 0;
1516
1517 newinfo = xt_alloc_table_info(tmp.size);
1518 if (!newinfo)
1519 return -ENOMEM;
1520
1521 loc_cpu_entry = newinfo->entries;
1522 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1523 tmp.size) != 0) {
1524 ret = -EFAULT;
1525 goto free_newinfo;
1526 }
1527
1528 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1529 if (ret != 0)
1530 goto free_newinfo;
1531
1532 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1533 tmp.num_counters, compat_ptr(tmp.counters));
1534 if (ret)
1535 goto free_newinfo_untrans;
1536 return 0;
1537
1538 free_newinfo_untrans:
1539 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1540 cleanup_entry(iter, net);
1541 free_newinfo:
1542 xt_free_table_info(newinfo);
1543 return ret;
1544}
1545
1546static int
1547compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1548 unsigned int len)
1549{
1550 int ret;
1551
1552 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1553 return -EPERM;
1554
1555 switch (cmd) {
1556 case IP6T_SO_SET_REPLACE:
1557 ret = compat_do_replace(sock_net(sk), user, len);
1558 break;
1559
1560 case IP6T_SO_SET_ADD_COUNTERS:
1561 ret = do_add_counters(sock_net(sk), user, len, 1);
1562 break;
1563
1564 default:
1565 ret = -EINVAL;
1566 }
1567
1568 return ret;
1569}
1570
1571struct compat_ip6t_get_entries {
1572 char name[XT_TABLE_MAXNAMELEN];
1573 compat_uint_t size;
1574 struct compat_ip6t_entry entrytable[0];
1575};
1576
1577static int
1578compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1579 void __user *userptr)
1580{
1581 struct xt_counters *counters;
1582 const struct xt_table_info *private = table->private;
1583 void __user *pos;
1584 unsigned int size;
1585 int ret = 0;
1586 unsigned int i = 0;
1587 struct ip6t_entry *iter;
1588
1589 counters = alloc_counters(table);
1590 if (IS_ERR(counters))
1591 return PTR_ERR(counters);
1592
1593 pos = userptr;
1594 size = total_size;
1595 xt_entry_foreach(iter, private->entries, total_size) {
1596 ret = compat_copy_entry_to_user(iter, &pos,
1597 &size, counters, i++);
1598 if (ret != 0)
1599 break;
1600 }
1601
1602 vfree(counters);
1603 return ret;
1604}
1605
1606static int
1607compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1608 int *len)
1609{
1610 int ret;
1611 struct compat_ip6t_get_entries get;
1612 struct xt_table *t;
1613
1614 if (*len < sizeof(get))
1615 return -EINVAL;
1616
1617 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1618 return -EFAULT;
1619
1620 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size)
1621 return -EINVAL;
1622
1623 get.name[sizeof(get.name) - 1] = '\0';
1624
1625 xt_compat_lock(AF_INET6);
1626 t = xt_find_table_lock(net, AF_INET6, get.name);
1627 if (!IS_ERR(t)) {
1628 const struct xt_table_info *private = t->private;
1629 struct xt_table_info info;
1630 ret = compat_table_info(private, &info);
1631 if (!ret && get.size == info.size)
1632 ret = compat_copy_entries_to_user(private->size,
1633 t, uptr->entrytable);
1634 else if (!ret)
1635 ret = -EAGAIN;
1636
1637 xt_compat_flush_offsets(AF_INET6);
1638 module_put(t->me);
1639 xt_table_unlock(t);
1640 } else
1641 ret = PTR_ERR(t);
1642
1643 xt_compat_unlock(AF_INET6);
1644 return ret;
1645}
1646
1647static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1648
1649static int
1650compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1651{
1652 int ret;
1653
1654 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1655 return -EPERM;
1656
1657 switch (cmd) {
1658 case IP6T_SO_GET_INFO:
1659 ret = get_info(sock_net(sk), user, len, 1);
1660 break;
1661 case IP6T_SO_GET_ENTRIES:
1662 ret = compat_get_entries(sock_net(sk), user, len);
1663 break;
1664 default:
1665 ret = do_ip6t_get_ctl(sk, cmd, user, len);
1666 }
1667 return ret;
1668}
1669#endif
1670
1671static int
1672do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1673{
1674 int ret;
1675
1676 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1677 return -EPERM;
1678
1679 switch (cmd) {
1680 case IP6T_SO_SET_REPLACE:
1681 ret = do_replace(sock_net(sk), user, len);
1682 break;
1683
1684 case IP6T_SO_SET_ADD_COUNTERS:
1685 ret = do_add_counters(sock_net(sk), user, len, 0);
1686 break;
1687
1688 default:
1689 ret = -EINVAL;
1690 }
1691
1692 return ret;
1693}
1694
1695static int
1696do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1697{
1698 int ret;
1699
1700 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1701 return -EPERM;
1702
1703 switch (cmd) {
1704 case IP6T_SO_GET_INFO:
1705 ret = get_info(sock_net(sk), user, len, 0);
1706 break;
1707
1708 case IP6T_SO_GET_ENTRIES:
1709 ret = get_entries(sock_net(sk), user, len);
1710 break;
1711
1712 case IP6T_SO_GET_REVISION_MATCH:
1713 case IP6T_SO_GET_REVISION_TARGET: {
1714 struct xt_get_revision rev;
1715 int target;
1716
1717 if (*len != sizeof(rev)) {
1718 ret = -EINVAL;
1719 break;
1720 }
1721 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1722 ret = -EFAULT;
1723 break;
1724 }
1725 rev.name[sizeof(rev.name)-1] = 0;
1726
1727 if (cmd == IP6T_SO_GET_REVISION_TARGET)
1728 target = 1;
1729 else
1730 target = 0;
1731
1732 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
1733 rev.revision,
1734 target, &ret),
1735 "ip6t_%s", rev.name);
1736 break;
1737 }
1738
1739 default:
1740 ret = -EINVAL;
1741 }
1742
1743 return ret;
1744}
1745
1746static void __ip6t_unregister_table(struct net *net, struct xt_table *table)
1747{
1748 struct xt_table_info *private;
1749 void *loc_cpu_entry;
1750 struct module *table_owner = table->me;
1751 struct ip6t_entry *iter;
1752
1753 private = xt_unregister_table(table);
1754
1755
1756 loc_cpu_entry = private->entries;
1757 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1758 cleanup_entry(iter, net);
1759 if (private->number > private->initial_entries)
1760 module_put(table_owner);
1761 xt_free_table_info(private);
1762}
1763
1764int ip6t_register_table(struct net *net, const struct xt_table *table,
1765 const struct ip6t_replace *repl,
1766 const struct nf_hook_ops *ops,
1767 struct xt_table **res)
1768{
1769 int ret;
1770 struct xt_table_info *newinfo;
1771 struct xt_table_info bootstrap = {0};
1772 void *loc_cpu_entry;
1773 struct xt_table *new_table;
1774
1775 newinfo = xt_alloc_table_info(repl->size);
1776 if (!newinfo)
1777 return -ENOMEM;
1778
1779 loc_cpu_entry = newinfo->entries;
1780 memcpy(loc_cpu_entry, repl->entries, repl->size);
1781
1782 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1783 if (ret != 0)
1784 goto out_free;
1785
1786 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1787 if (IS_ERR(new_table)) {
1788 ret = PTR_ERR(new_table);
1789 goto out_free;
1790 }
1791
1792
1793 WRITE_ONCE(*res, new_table);
1794 if (!ops)
1795 return 0;
1796
1797 ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
1798 if (ret != 0) {
1799 __ip6t_unregister_table(net, new_table);
1800 *res = NULL;
1801 }
1802
1803 return ret;
1804
1805out_free:
1806 xt_free_table_info(newinfo);
1807 return ret;
1808}
1809
1810void ip6t_unregister_table(struct net *net, struct xt_table *table,
1811 const struct nf_hook_ops *ops)
1812{
1813 if (ops)
1814 nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
1815 __ip6t_unregister_table(net, table);
1816}
1817
1818
1819static inline bool
1820icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
1821 u_int8_t type, u_int8_t code,
1822 bool invert)
1823{
1824 return (type == test_type && code >= min_code && code <= max_code)
1825 ^ invert;
1826}
1827
1828static bool
1829icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
1830{
1831 const struct icmp6hdr *ic;
1832 struct icmp6hdr _icmph;
1833 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1834
1835
1836 if (par->fragoff != 0)
1837 return false;
1838
1839 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
1840 if (ic == NULL) {
1841
1842
1843
1844 par->hotdrop = true;
1845 return false;
1846 }
1847
1848 return icmp6_type_code_match(icmpinfo->type,
1849 icmpinfo->code[0],
1850 icmpinfo->code[1],
1851 ic->icmp6_type, ic->icmp6_code,
1852 !!(icmpinfo->invflags&IP6T_ICMP_INV));
1853}
1854
1855
1856static int icmp6_checkentry(const struct xt_mtchk_param *par)
1857{
1858 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1859
1860
1861 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
1862}
1863
1864
1865static struct xt_target ip6t_builtin_tg[] __read_mostly = {
1866 {
1867 .name = XT_STANDARD_TARGET,
1868 .targetsize = sizeof(int),
1869 .family = NFPROTO_IPV6,
1870#ifdef CONFIG_COMPAT
1871 .compatsize = sizeof(compat_int_t),
1872 .compat_from_user = compat_standard_from_user,
1873 .compat_to_user = compat_standard_to_user,
1874#endif
1875 },
1876 {
1877 .name = XT_ERROR_TARGET,
1878 .target = ip6t_error,
1879 .targetsize = XT_FUNCTION_MAXNAMELEN,
1880 .family = NFPROTO_IPV6,
1881 },
1882};
1883
1884static struct nf_sockopt_ops ip6t_sockopts = {
1885 .pf = PF_INET6,
1886 .set_optmin = IP6T_BASE_CTL,
1887 .set_optmax = IP6T_SO_SET_MAX+1,
1888 .set = do_ip6t_set_ctl,
1889#ifdef CONFIG_COMPAT
1890 .compat_set = compat_do_ip6t_set_ctl,
1891#endif
1892 .get_optmin = IP6T_BASE_CTL,
1893 .get_optmax = IP6T_SO_GET_MAX+1,
1894 .get = do_ip6t_get_ctl,
1895#ifdef CONFIG_COMPAT
1896 .compat_get = compat_do_ip6t_get_ctl,
1897#endif
1898 .owner = THIS_MODULE,
1899};
1900
1901static struct xt_match ip6t_builtin_mt[] __read_mostly = {
1902 {
1903 .name = "icmp6",
1904 .match = icmp6_match,
1905 .matchsize = sizeof(struct ip6t_icmp),
1906 .checkentry = icmp6_checkentry,
1907 .proto = IPPROTO_ICMPV6,
1908 .family = NFPROTO_IPV6,
1909 .me = THIS_MODULE,
1910 },
1911};
1912
1913static int __net_init ip6_tables_net_init(struct net *net)
1914{
1915 return xt_proto_init(net, NFPROTO_IPV6);
1916}
1917
1918static void __net_exit ip6_tables_net_exit(struct net *net)
1919{
1920 xt_proto_fini(net, NFPROTO_IPV6);
1921}
1922
1923static struct pernet_operations ip6_tables_net_ops = {
1924 .init = ip6_tables_net_init,
1925 .exit = ip6_tables_net_exit,
1926};
1927
1928static int __init ip6_tables_init(void)
1929{
1930 int ret;
1931
1932 ret = register_pernet_subsys(&ip6_tables_net_ops);
1933 if (ret < 0)
1934 goto err1;
1935
1936
1937 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1938 if (ret < 0)
1939 goto err2;
1940 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1941 if (ret < 0)
1942 goto err4;
1943
1944
1945 ret = nf_register_sockopt(&ip6t_sockopts);
1946 if (ret < 0)
1947 goto err5;
1948
1949 return 0;
1950
1951err5:
1952 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1953err4:
1954 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1955err2:
1956 unregister_pernet_subsys(&ip6_tables_net_ops);
1957err1:
1958 return ret;
1959}
1960
1961static void __exit ip6_tables_fini(void)
1962{
1963 nf_unregister_sockopt(&ip6t_sockopts);
1964
1965 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1966 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1967 unregister_pernet_subsys(&ip6_tables_net_ops);
1968}
1969
1970EXPORT_SYMBOL(ip6t_register_table);
1971EXPORT_SYMBOL(ip6t_unregister_table);
1972EXPORT_SYMBOL(ip6t_do_table);
1973
1974module_init(ip6_tables_init);
1975module_exit(ip6_tables_fini);
1976
