2 * Packet matching code.
4 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
5 * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
6 * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/kernel.h>
16 #include <linux/capability.h>
18 #include <linux/skbuff.h>
19 #include <linux/kmod.h>
20 #include <linux/vmalloc.h>
21 #include <linux/netdevice.h>
22 #include <linux/module.h>
23 #include <linux/poison.h>
24 #include <linux/icmpv6.h>
26 #include <net/compat.h>
27 #include <linux/uaccess.h>
28 #include <linux/mutex.h>
29 #include <linux/proc_fs.h>
30 #include <linux/err.h>
31 #include <linux/cpumask.h>
33 #include <linux/netfilter_ipv6/ip6_tables.h>
34 #include <linux/netfilter/x_tables.h>
35 #include <net/netfilter/nf_log.h>
36 #include "../../netfilter/xt_repldata.h"
38 MODULE_LICENSE("GPL");
39 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
40 MODULE_DESCRIPTION("IPv6 packet filter");
42 void *ip6t_alloc_initial_table(const struct xt_table *info)
44 return xt_alloc_initial_table(ip6t, IP6T);
46 EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
48 /* Returns whether matches rule or not. */
49 /* Performance critical - called for every packet */
51 ip6_packet_match(const struct sk_buff *skb,
54 const struct ip6t_ip6 *ip6info,
55 unsigned int *protoff,
56 int *fragoff, bool *hotdrop)
59 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
61 if (NF_INVF(ip6info, IP6T_INV_SRCIP,
62 ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
64 NF_INVF(ip6info, IP6T_INV_DSTIP,
65 ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
69 ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
71 if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0))
74 ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
76 if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0))
79 /* ... might want to do something with class and flowlabel here ... */
81 /* look for the desired protocol header */
82 if (ip6info->flags & IP6T_F_PROTO) {
84 unsigned short _frag_off;
86 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL);
94 if (ip6info->proto == protohdr) {
95 if (ip6info->invflags & IP6T_INV_PROTO)
101 /* We need match for the '-p all', too! */
102 if ((ip6info->proto != 0) &&
103 !(ip6info->invflags & IP6T_INV_PROTO))
109 /* should be ip6 safe */
111 ip6_checkentry(const struct ip6t_ip6 *ipv6)
113 if (ipv6->flags & ~IP6T_F_MASK)
115 if (ipv6->invflags & ~IP6T_INV_MASK)
122 ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
124 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
129 static inline struct ip6t_entry *
130 get_entry(const void *base, unsigned int offset)
132 return (struct ip6t_entry *)(base + offset);
135 /* All zeroes == unconditional rule. */
136 /* Mildly perf critical (only if packet tracing is on) */
137 static inline bool unconditional(const struct ip6t_entry *e)
139 static const struct ip6t_ip6 uncond;
141 return e->target_offset == sizeof(struct ip6t_entry) &&
142 memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0;
145 static inline const struct xt_entry_target *
146 ip6t_get_target_c(const struct ip6t_entry *e)
148 return ip6t_get_target((struct ip6t_entry *)e);
151 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
152 /* This cries for unification! */
153 static const char *const hooknames[] = {
154 [NF_INET_PRE_ROUTING] = "PREROUTING",
155 [NF_INET_LOCAL_IN] = "INPUT",
156 [NF_INET_FORWARD] = "FORWARD",
157 [NF_INET_LOCAL_OUT] = "OUTPUT",
158 [NF_INET_POST_ROUTING] = "POSTROUTING",
161 enum nf_ip_trace_comments {
162 NF_IP6_TRACE_COMMENT_RULE,
163 NF_IP6_TRACE_COMMENT_RETURN,
164 NF_IP6_TRACE_COMMENT_POLICY,
167 static const char *const comments[] = {
168 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
169 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
170 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
173 static const struct nf_loginfo trace_loginfo = {
174 .type = NF_LOG_TYPE_LOG,
177 .level = LOGLEVEL_WARNING,
178 .logflags = NF_LOG_DEFAULT_MASK,
183 /* Mildly perf critical (only if packet tracing is on) */
185 get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
186 const char *hookname, const char **chainname,
187 const char **comment, unsigned int *rulenum)
189 const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
191 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
192 /* Head of user chain: ERROR target with chainname */
193 *chainname = t->target.data;
198 if (unconditional(s) &&
199 strcmp(t->target.u.kernel.target->name,
200 XT_STANDARD_TARGET) == 0 &&
202 /* Tail of chains: STANDARD target (return/policy) */
203 *comment = *chainname == hookname
204 ? comments[NF_IP6_TRACE_COMMENT_POLICY]
205 : comments[NF_IP6_TRACE_COMMENT_RETURN];
214 static void trace_packet(struct net *net,
215 const struct sk_buff *skb,
217 const struct net_device *in,
218 const struct net_device *out,
219 const char *tablename,
220 const struct xt_table_info *private,
221 const struct ip6t_entry *e)
223 const struct ip6t_entry *root;
224 const char *hookname, *chainname, *comment;
225 const struct ip6t_entry *iter;
226 unsigned int rulenum = 0;
228 root = get_entry(private->entries, private->hook_entry[hook]);
230 hookname = chainname = hooknames[hook];
231 comment = comments[NF_IP6_TRACE_COMMENT_RULE];
233 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
234 if (get_chainname_rulenum(iter, e, hookname,
235 &chainname, &comment, &rulenum) != 0)
238 nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
239 "TRACE: %s:%s:%s:%u ",
240 tablename, chainname, comment, rulenum);
244 static inline struct ip6t_entry *
245 ip6t_next_entry(const struct ip6t_entry *entry)
247 return (void *)entry + entry->next_offset;
250 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
252 ip6t_do_table(struct sk_buff *skb,
253 const struct nf_hook_state *state,
254 struct xt_table *table)
256 unsigned int hook = state->hook;
257 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
258 /* Initializing verdict to NF_DROP keeps gcc happy. */
259 unsigned int verdict = NF_DROP;
260 const char *indev, *outdev;
261 const void *table_base;
262 struct ip6t_entry *e, **jumpstack;
263 unsigned int stackidx, cpu;
264 const struct xt_table_info *private;
265 struct xt_action_param acpar;
270 indev = state->in ? state->in->name : nulldevname;
271 outdev = state->out ? state->out->name : nulldevname;
272 /* We handle fragments by dealing with the first fragment as
273 * if it was a normal packet. All other fragments are treated
274 * normally, except that they will NEVER match rules that ask
275 * things we don't know, ie. tcp syn flag or ports). If the
276 * rule is also a fragment-specific rule, non-fragments won't
279 acpar.hotdrop = false;
282 WARN_ON(!(table->valid_hooks & (1 << hook)));
285 addend = xt_write_recseq_begin();
286 private = table->private;
288 * Ensure we load private-> members after we've fetched the base
291 smp_read_barrier_depends();
292 cpu = smp_processor_id();
293 table_base = private->entries;
294 jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
296 /* Switch to alternate jumpstack if we're being invoked via TEE.
297 * TEE issues XT_CONTINUE verdict on original skb so we must not
298 * clobber the jumpstack.
300 * For recursion via REJECT or SYNPROXY the stack will be clobbered
301 * but it is no problem since absolute verdict is issued by these.
303 if (static_key_false(&xt_tee_enabled))
304 jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
306 e = get_entry(table_base, private->hook_entry[hook]);
309 const struct xt_entry_target *t;
310 const struct xt_entry_match *ematch;
311 struct xt_counters *counter;
315 if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
316 &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
318 e = ip6t_next_entry(e);
322 xt_ematch_foreach(ematch, e) {
323 acpar.match = ematch->u.kernel.match;
324 acpar.matchinfo = ematch->data;
325 if (!acpar.match->match(skb, &acpar))
329 counter = xt_get_this_cpu_counter(&e->counters);
330 ADD_COUNTER(*counter, skb->len, 1);
332 t = ip6t_get_target_c(e);
333 WARN_ON(!t->u.kernel.target);
335 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
336 /* The packet is traced: log it */
337 if (unlikely(skb->nf_trace))
338 trace_packet(state->net, skb, hook, state->in,
339 state->out, table->name, private, e);
341 /* Standard target? */
342 if (!t->u.kernel.target->target) {
345 v = ((struct xt_standard_target *)t)->verdict;
347 /* Pop from stack? */
348 if (v != XT_RETURN) {
349 verdict = (unsigned int)(-v) - 1;
353 e = get_entry(table_base,
354 private->underflow[hook]);
356 e = ip6t_next_entry(jumpstack[--stackidx]);
359 if (table_base + v != ip6t_next_entry(e) &&
360 !(e->ipv6.flags & IP6T_F_GOTO)) {
361 if (unlikely(stackidx >= private->stacksize)) {
365 jumpstack[stackidx++] = e;
368 e = get_entry(table_base, v);
372 acpar.target = t->u.kernel.target;
373 acpar.targinfo = t->data;
375 verdict = t->u.kernel.target->target(skb, &acpar);
376 if (verdict == XT_CONTINUE)
377 e = ip6t_next_entry(e);
381 } while (!acpar.hotdrop);
383 xt_write_recseq_end(addend);
391 /* Figures out from what hook each rule can be called: returns 0 if
392 there are loops. Puts hook bitmask in comefrom. */
394 mark_source_chains(const struct xt_table_info *newinfo,
395 unsigned int valid_hooks, void *entry0,
396 unsigned int *offsets)
400 /* No recursion; use packet counter to save back ptrs (reset
401 to 0 as we leave), and comefrom to save source hook bitmask */
402 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
403 unsigned int pos = newinfo->hook_entry[hook];
404 struct ip6t_entry *e = entry0 + pos;
406 if (!(valid_hooks & (1 << hook)))
409 /* Set initial back pointer. */
410 e->counters.pcnt = pos;
413 const struct xt_standard_target *t
414 = (void *)ip6t_get_target_c(e);
415 int visited = e->comefrom & (1 << hook);
417 if (e->comefrom & (1 << NF_INET_NUMHOOKS))
420 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
422 /* Unconditional return/END. */
423 if ((unconditional(e) &&
424 (strcmp(t->target.u.user.name,
425 XT_STANDARD_TARGET) == 0) &&
426 t->verdict < 0) || visited) {
427 unsigned int oldpos, size;
429 if ((strcmp(t->target.u.user.name,
430 XT_STANDARD_TARGET) == 0) &&
431 t->verdict < -NF_MAX_VERDICT - 1)
434 /* Return: backtrack through the last
437 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
439 pos = e->counters.pcnt;
440 e->counters.pcnt = 0;
442 /* We're at the start. */
447 } while (oldpos == pos + e->next_offset);
450 size = e->next_offset;
451 e = entry0 + pos + size;
452 if (pos + size >= newinfo->size)
454 e->counters.pcnt = pos;
457 int newpos = t->verdict;
459 if (strcmp(t->target.u.user.name,
460 XT_STANDARD_TARGET) == 0 &&
462 /* This a jump; chase it. */
463 if (!xt_find_jump_offset(offsets, newpos,
468 /* ... this is a fallthru */
469 newpos = pos + e->next_offset;
470 if (newpos >= newinfo->size)
474 e->counters.pcnt = pos;
483 static void cleanup_match(struct xt_entry_match *m, struct net *net)
485 struct xt_mtdtor_param par;
488 par.match = m->u.kernel.match;
489 par.matchinfo = m->data;
490 par.family = NFPROTO_IPV6;
491 if (par.match->destroy != NULL)
492 par.match->destroy(&par);
493 module_put(par.match->me);
496 static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
498 const struct ip6t_ip6 *ipv6 = par->entryinfo;
500 par->match = m->u.kernel.match;
501 par->matchinfo = m->data;
503 return xt_check_match(par, m->u.match_size - sizeof(*m),
504 ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
508 find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
510 struct xt_match *match;
513 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
516 return PTR_ERR(match);
518 m->u.kernel.match = match;
520 ret = check_match(m, par);
526 module_put(m->u.kernel.match->me);
530 static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
532 struct xt_entry_target *t = ip6t_get_target(e);
533 struct xt_tgchk_param par = {
537 .target = t->u.kernel.target,
539 .hook_mask = e->comefrom,
540 .family = NFPROTO_IPV6,
543 t = ip6t_get_target(e);
544 return xt_check_target(&par, t->u.target_size - sizeof(*t),
546 e->ipv6.invflags & IP6T_INV_PROTO);
550 find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
552 struct xt_percpu_counter_alloc_state *alloc_state)
554 struct xt_entry_target *t;
555 struct xt_target *target;
558 struct xt_mtchk_param mtpar;
559 struct xt_entry_match *ematch;
561 if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
565 memset(&mtpar, 0, sizeof(mtpar));
568 mtpar.entryinfo = &e->ipv6;
569 mtpar.hook_mask = e->comefrom;
570 mtpar.family = NFPROTO_IPV6;
571 xt_ematch_foreach(ematch, e) {
572 ret = find_check_match(ematch, &mtpar);
574 goto cleanup_matches;
578 t = ip6t_get_target(e);
579 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
581 if (IS_ERR(target)) {
582 ret = PTR_ERR(target);
583 goto cleanup_matches;
585 t->u.kernel.target = target;
587 ret = check_target(e, net, name);
592 module_put(t->u.kernel.target->me);
594 xt_ematch_foreach(ematch, e) {
597 cleanup_match(ematch, net);
600 xt_percpu_counter_free(&e->counters);
605 static bool check_underflow(const struct ip6t_entry *e)
607 const struct xt_entry_target *t;
608 unsigned int verdict;
610 if (!unconditional(e))
612 t = ip6t_get_target_c(e);
613 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
615 verdict = ((struct xt_standard_target *)t)->verdict;
616 verdict = -verdict - 1;
617 return verdict == NF_DROP || verdict == NF_ACCEPT;
621 check_entry_size_and_hooks(struct ip6t_entry *e,
622 struct xt_table_info *newinfo,
623 const unsigned char *base,
624 const unsigned char *limit,
625 const unsigned int *hook_entries,
626 const unsigned int *underflows,
627 unsigned int valid_hooks)
632 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
633 (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
634 (unsigned char *)e + e->next_offset > limit)
638 < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target))
641 if (!ip6_checkentry(&e->ipv6))
644 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
649 /* Check hooks & underflows */
650 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
651 if (!(valid_hooks & (1 << h)))
653 if ((unsigned char *)e - base == hook_entries[h])
654 newinfo->hook_entry[h] = hook_entries[h];
655 if ((unsigned char *)e - base == underflows[h]) {
656 if (!check_underflow(e))
659 newinfo->underflow[h] = underflows[h];
663 /* Clear counters and comefrom */
664 e->counters = ((struct xt_counters) { 0, 0 });
669 static void cleanup_entry(struct ip6t_entry *e, struct net *net)
671 struct xt_tgdtor_param par;
672 struct xt_entry_target *t;
673 struct xt_entry_match *ematch;
675 /* Cleanup all matches */
676 xt_ematch_foreach(ematch, e)
677 cleanup_match(ematch, net);
678 t = ip6t_get_target(e);
681 par.target = t->u.kernel.target;
682 par.targinfo = t->data;
683 par.family = NFPROTO_IPV6;
684 if (par.target->destroy != NULL)
685 par.target->destroy(&par);
686 module_put(par.target->me);
687 xt_percpu_counter_free(&e->counters);
690 /* Checks and translates the user-supplied table segment (held in
693 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
694 const struct ip6t_replace *repl)
696 struct xt_percpu_counter_alloc_state alloc_state = { 0 };
697 struct ip6t_entry *iter;
698 unsigned int *offsets;
702 newinfo->size = repl->size;
703 newinfo->number = repl->num_entries;
705 /* Init all hooks to impossible value. */
706 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
707 newinfo->hook_entry[i] = 0xFFFFFFFF;
708 newinfo->underflow[i] = 0xFFFFFFFF;
711 offsets = xt_alloc_entry_offsets(newinfo->number);
715 /* Walk through entries, checking offsets. */
716 xt_entry_foreach(iter, entry0, newinfo->size) {
717 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
724 if (i < repl->num_entries)
725 offsets[i] = (void *)iter - entry0;
727 if (strcmp(ip6t_get_target(iter)->u.user.name,
728 XT_ERROR_TARGET) == 0)
729 ++newinfo->stacksize;
733 if (i != repl->num_entries)
736 /* Check hooks all assigned */
737 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
738 /* Only hooks which are valid */
739 if (!(repl->valid_hooks & (1 << i)))
741 if (newinfo->hook_entry[i] == 0xFFFFFFFF)
743 if (newinfo->underflow[i] == 0xFFFFFFFF)
747 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
753 /* Finally, each sanity check must pass */
755 xt_entry_foreach(iter, entry0, newinfo->size) {
756 ret = find_check_entry(iter, net, repl->name, repl->size,
764 xt_entry_foreach(iter, entry0, newinfo->size) {
767 cleanup_entry(iter, net);
779 get_counters(const struct xt_table_info *t,
780 struct xt_counters counters[])
782 struct ip6t_entry *iter;
786 for_each_possible_cpu(cpu) {
787 seqcount_t *s = &per_cpu(xt_recseq, cpu);
790 xt_entry_foreach(iter, t->entries, t->size) {
791 struct xt_counters *tmp;
795 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
797 start = read_seqcount_begin(s);
800 } while (read_seqcount_retry(s, start));
802 ADD_COUNTER(counters[i], bcnt, pcnt);
809 static struct xt_counters *alloc_counters(const struct xt_table *table)
811 unsigned int countersize;
812 struct xt_counters *counters;
813 const struct xt_table_info *private = table->private;
815 /* We need atomic snapshot of counters: rest doesn't change
816 (other than comefrom, which userspace doesn't care
818 countersize = sizeof(struct xt_counters) * private->number;
819 counters = vzalloc(countersize);
821 if (counters == NULL)
822 return ERR_PTR(-ENOMEM);
824 get_counters(private, counters);
830 copy_entries_to_user(unsigned int total_size,
831 const struct xt_table *table,
832 void __user *userptr)
834 unsigned int off, num;
835 const struct ip6t_entry *e;
836 struct xt_counters *counters;
837 const struct xt_table_info *private = table->private;
839 const void *loc_cpu_entry;
841 counters = alloc_counters(table);
842 if (IS_ERR(counters))
843 return PTR_ERR(counters);
845 loc_cpu_entry = private->entries;
847 /* FIXME: use iterator macros --RR */
848 /* ... then go back and fix counters and names */
849 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
851 const struct xt_entry_match *m;
852 const struct xt_entry_target *t;
854 e = loc_cpu_entry + off;
855 if (copy_to_user(userptr + off, e, sizeof(*e))) {
859 if (copy_to_user(userptr + off
860 + offsetof(struct ip6t_entry, counters),
862 sizeof(counters[num])) != 0) {
867 for (i = sizeof(struct ip6t_entry);
868 i < e->target_offset;
869 i += m->u.match_size) {
872 if (xt_match_to_user(m, userptr + off + i)) {
878 t = ip6t_get_target_c(e);
879 if (xt_target_to_user(t, userptr + off + e->target_offset)) {
891 static void compat_standard_from_user(void *dst, const void *src)
893 int v = *(compat_int_t *)src;
896 v += xt_compat_calc_jump(AF_INET6, v);
897 memcpy(dst, &v, sizeof(v));
900 static int compat_standard_to_user(void __user *dst, const void *src)
902 compat_int_t cv = *(int *)src;
905 cv -= xt_compat_calc_jump(AF_INET6, cv);
906 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
909 static int compat_calc_entry(const struct ip6t_entry *e,
910 const struct xt_table_info *info,
911 const void *base, struct xt_table_info *newinfo)
913 const struct xt_entry_match *ematch;
914 const struct xt_entry_target *t;
915 unsigned int entry_offset;
918 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
919 entry_offset = (void *)e - base;
920 xt_ematch_foreach(ematch, e)
921 off += xt_compat_match_offset(ematch->u.kernel.match);
922 t = ip6t_get_target_c(e);
923 off += xt_compat_target_offset(t->u.kernel.target);
924 newinfo->size -= off;
925 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
929 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
930 if (info->hook_entry[i] &&
931 (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
932 newinfo->hook_entry[i] -= off;
933 if (info->underflow[i] &&
934 (e < (struct ip6t_entry *)(base + info->underflow[i])))
935 newinfo->underflow[i] -= off;
940 static int compat_table_info(const struct xt_table_info *info,
941 struct xt_table_info *newinfo)
943 struct ip6t_entry *iter;
944 const void *loc_cpu_entry;
947 if (!newinfo || !info)
950 /* we dont care about newinfo->entries */
951 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
952 newinfo->initial_entries = 0;
953 loc_cpu_entry = info->entries;
954 ret = xt_compat_init_offsets(AF_INET6, info->number);
957 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
958 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
966 static int get_info(struct net *net, void __user *user,
967 const int *len, int compat)
969 char name[XT_TABLE_MAXNAMELEN];
973 if (*len != sizeof(struct ip6t_getinfo))
976 if (copy_from_user(name, user, sizeof(name)) != 0)
979 name[XT_TABLE_MAXNAMELEN-1] = '\0';
982 xt_compat_lock(AF_INET6);
984 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
985 "ip6table_%s", name);
987 struct ip6t_getinfo info;
988 const struct xt_table_info *private = t->private;
990 struct xt_table_info tmp;
993 ret = compat_table_info(private, &tmp);
994 xt_compat_flush_offsets(AF_INET6);
998 memset(&info, 0, sizeof(info));
999 info.valid_hooks = t->valid_hooks;
1000 memcpy(info.hook_entry, private->hook_entry,
1001 sizeof(info.hook_entry));
1002 memcpy(info.underflow, private->underflow,
1003 sizeof(info.underflow));
1004 info.num_entries = private->number;
1005 info.size = private->size;
1006 strcpy(info.name, name);
1008 if (copy_to_user(user, &info, *len) != 0)
1017 #ifdef CONFIG_COMPAT
1019 xt_compat_unlock(AF_INET6);
1025 get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
1029 struct ip6t_get_entries get;
1032 if (*len < sizeof(get))
1034 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1036 if (*len != sizeof(struct ip6t_get_entries) + get.size)
1039 get.name[sizeof(get.name) - 1] = '\0';
1041 t = xt_find_table_lock(net, AF_INET6, get.name);
1043 struct xt_table_info *private = t->private;
1044 if (get.size == private->size)
1045 ret = copy_entries_to_user(private->size,
1046 t, uptr->entrytable);
1059 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1060 struct xt_table_info *newinfo, unsigned int num_counters,
1061 void __user *counters_ptr)
1065 struct xt_table_info *oldinfo;
1066 struct xt_counters *counters;
1067 struct ip6t_entry *iter;
1070 counters = xt_counters_alloc(num_counters);
1076 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1077 "ip6table_%s", name);
1080 goto free_newinfo_counters_untrans;
1084 if (valid_hooks != t->valid_hooks) {
1089 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1093 /* Update module usage count based on number of rules */
1094 if ((oldinfo->number > oldinfo->initial_entries) ||
1095 (newinfo->number <= oldinfo->initial_entries))
1097 if ((oldinfo->number > oldinfo->initial_entries) &&
1098 (newinfo->number <= oldinfo->initial_entries))
1101 /* Get the old counters, and synchronize with replace */
1102 get_counters(oldinfo, counters);
1104 /* Decrease module usage counts and free resource */
1105 xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
1106 cleanup_entry(iter, net);
1108 xt_free_table_info(oldinfo);
1109 if (copy_to_user(counters_ptr, counters,
1110 sizeof(struct xt_counters) * num_counters) != 0) {
1111 /* Silent error, can't fail, new table is already in place */
1112 net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n");
1121 free_newinfo_counters_untrans:
1128 do_replace(struct net *net, const void __user *user, unsigned int len)
1131 struct ip6t_replace tmp;
1132 struct xt_table_info *newinfo;
1133 void *loc_cpu_entry;
1134 struct ip6t_entry *iter;
1136 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1139 /* overflow check */
1140 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1142 if (tmp.num_counters == 0)
1145 tmp.name[sizeof(tmp.name)-1] = 0;
1147 newinfo = xt_alloc_table_info(tmp.size);
1151 loc_cpu_entry = newinfo->entries;
1152 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1158 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1162 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1163 tmp.num_counters, tmp.counters);
1165 goto free_newinfo_untrans;
1168 free_newinfo_untrans:
1169 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1170 cleanup_entry(iter, net);
1172 xt_free_table_info(newinfo);
1177 do_add_counters(struct net *net, const void __user *user, unsigned int len,
1181 struct xt_counters_info tmp;
1182 struct xt_counters *paddc;
1184 const struct xt_table_info *private;
1186 struct ip6t_entry *iter;
1187 unsigned int addend;
1189 paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
1191 return PTR_ERR(paddc);
1192 t = xt_find_table_lock(net, AF_INET6, tmp.name);
1199 private = t->private;
1200 if (private->number != tmp.num_counters) {
1202 goto unlock_up_free;
1206 addend = xt_write_recseq_begin();
1207 xt_entry_foreach(iter, private->entries, private->size) {
1208 struct xt_counters *tmp;
1210 tmp = xt_get_this_cpu_counter(&iter->counters);
1211 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1214 xt_write_recseq_end(addend);
1225 #ifdef CONFIG_COMPAT
1226 struct compat_ip6t_replace {
1227 char name[XT_TABLE_MAXNAMELEN];
1231 u32 hook_entry[NF_INET_NUMHOOKS];
1232 u32 underflow[NF_INET_NUMHOOKS];
1234 compat_uptr_t counters; /* struct xt_counters * */
1235 struct compat_ip6t_entry entries[0];
1239 compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
1240 unsigned int *size, struct xt_counters *counters,
1243 struct xt_entry_target *t;
1244 struct compat_ip6t_entry __user *ce;
1245 u_int16_t target_offset, next_offset;
1246 compat_uint_t origsize;
1247 const struct xt_entry_match *ematch;
1252 if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
1253 copy_to_user(&ce->counters, &counters[i],
1254 sizeof(counters[i])) != 0)
1257 *dstptr += sizeof(struct compat_ip6t_entry);
1258 *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1260 xt_ematch_foreach(ematch, e) {
1261 ret = xt_compat_match_to_user(ematch, dstptr, size);
1265 target_offset = e->target_offset - (origsize - *size);
1266 t = ip6t_get_target(e);
1267 ret = xt_compat_target_to_user(t, dstptr, size);
1270 next_offset = e->next_offset - (origsize - *size);
1271 if (put_user(target_offset, &ce->target_offset) != 0 ||
1272 put_user(next_offset, &ce->next_offset) != 0)
1278 compat_find_calc_match(struct xt_entry_match *m,
1279 const struct ip6t_ip6 *ipv6,
1282 struct xt_match *match;
1284 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
1285 m->u.user.revision);
1287 return PTR_ERR(match);
1289 m->u.kernel.match = match;
1290 *size += xt_compat_match_offset(match);
1294 static void compat_release_entry(struct compat_ip6t_entry *e)
1296 struct xt_entry_target *t;
1297 struct xt_entry_match *ematch;
1299 /* Cleanup all matches */
1300 xt_ematch_foreach(ematch, e)
1301 module_put(ematch->u.kernel.match->me);
1302 t = compat_ip6t_get_target(e);
1303 module_put(t->u.kernel.target->me);
1307 check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
1308 struct xt_table_info *newinfo,
1310 const unsigned char *base,
1311 const unsigned char *limit)
1313 struct xt_entry_match *ematch;
1314 struct xt_entry_target *t;
1315 struct xt_target *target;
1316 unsigned int entry_offset;
1320 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1321 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
1322 (unsigned char *)e + e->next_offset > limit)
1325 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1326 sizeof(struct compat_xt_entry_target))
1329 if (!ip6_checkentry(&e->ipv6))
1332 ret = xt_compat_check_entry_offsets(e, e->elems,
1333 e->target_offset, e->next_offset);
1337 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1338 entry_offset = (void *)e - (void *)base;
1340 xt_ematch_foreach(ematch, e) {
1341 ret = compat_find_calc_match(ematch, &e->ipv6, &off);
1343 goto release_matches;
1347 t = compat_ip6t_get_target(e);
1348 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1349 t->u.user.revision);
1350 if (IS_ERR(target)) {
1351 ret = PTR_ERR(target);
1352 goto release_matches;
1354 t->u.kernel.target = target;
1356 off += xt_compat_target_offset(target);
1358 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1365 module_put(t->u.kernel.target->me);
1367 xt_ematch_foreach(ematch, e) {
1370 module_put(ematch->u.kernel.match->me);
1376 compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1378 struct xt_table_info *newinfo, unsigned char *base)
1380 struct xt_entry_target *t;
1381 struct ip6t_entry *de;
1382 unsigned int origsize;
1384 struct xt_entry_match *ematch;
1388 memcpy(de, e, sizeof(struct ip6t_entry));
1389 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1391 *dstptr += sizeof(struct ip6t_entry);
1392 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1394 xt_ematch_foreach(ematch, e)
1395 xt_compat_match_from_user(ematch, dstptr, size);
1397 de->target_offset = e->target_offset - (origsize - *size);
1398 t = compat_ip6t_get_target(e);
1399 xt_compat_target_from_user(t, dstptr, size);
1401 de->next_offset = e->next_offset - (origsize - *size);
1402 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1403 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1404 newinfo->hook_entry[h] -= origsize - *size;
1405 if ((unsigned char *)de - base < newinfo->underflow[h])
1406 newinfo->underflow[h] -= origsize - *size;
1411 translate_compat_table(struct net *net,
1412 struct xt_table_info **pinfo,
1414 const struct compat_ip6t_replace *compatr)
1417 struct xt_table_info *newinfo, *info;
1418 void *pos, *entry0, *entry1;
1419 struct compat_ip6t_entry *iter0;
1420 struct ip6t_replace repl;
1426 size = compatr->size;
1427 info->number = compatr->num_entries;
1430 xt_compat_lock(AF_INET6);
1431 ret = xt_compat_init_offsets(AF_INET6, compatr->num_entries);
1434 /* Walk through entries, checking offsets. */
1435 xt_entry_foreach(iter0, entry0, compatr->size) {
1436 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1438 entry0 + compatr->size);
1445 if (j != compatr->num_entries)
1449 newinfo = xt_alloc_table_info(size);
1453 memset(newinfo->entries, 0, size);
1455 newinfo->number = compatr->num_entries;
1456 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1457 newinfo->hook_entry[i] = compatr->hook_entry[i];
1458 newinfo->underflow[i] = compatr->underflow[i];
1460 entry1 = newinfo->entries;
1462 size = compatr->size;
1463 xt_entry_foreach(iter0, entry0, compatr->size)
1464 compat_copy_entry_from_user(iter0, &pos, &size,
1467 /* all module references in entry0 are now gone. */
1468 xt_compat_flush_offsets(AF_INET6);
1469 xt_compat_unlock(AF_INET6);
1471 memcpy(&repl, compatr, sizeof(*compatr));
1473 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1474 repl.hook_entry[i] = newinfo->hook_entry[i];
1475 repl.underflow[i] = newinfo->underflow[i];
1478 repl.num_counters = 0;
1479 repl.counters = NULL;
1480 repl.size = newinfo->size;
1481 ret = translate_table(net, newinfo, entry1, &repl);
1487 xt_free_table_info(info);
1491 xt_free_table_info(newinfo);
1494 xt_compat_flush_offsets(AF_INET6);
1495 xt_compat_unlock(AF_INET6);
1496 xt_entry_foreach(iter0, entry0, compatr->size) {
1499 compat_release_entry(iter0);
1505 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1508 struct compat_ip6t_replace tmp;
1509 struct xt_table_info *newinfo;
1510 void *loc_cpu_entry;
1511 struct ip6t_entry *iter;
1513 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1516 /* overflow check */
1517 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1519 if (tmp.num_counters == 0)
1522 tmp.name[sizeof(tmp.name)-1] = 0;
1524 newinfo = xt_alloc_table_info(tmp.size);
1528 loc_cpu_entry = newinfo->entries;
1529 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1535 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1539 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1540 tmp.num_counters, compat_ptr(tmp.counters));
1542 goto free_newinfo_untrans;
1545 free_newinfo_untrans:
1546 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1547 cleanup_entry(iter, net);
1549 xt_free_table_info(newinfo);
1554 compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1559 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1563 case IP6T_SO_SET_REPLACE:
1564 ret = compat_do_replace(sock_net(sk), user, len);
1567 case IP6T_SO_SET_ADD_COUNTERS:
1568 ret = do_add_counters(sock_net(sk), user, len, 1);
1578 struct compat_ip6t_get_entries {
1579 char name[XT_TABLE_MAXNAMELEN];
1581 struct compat_ip6t_entry entrytable[0];
1585 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1586 void __user *userptr)
1588 struct xt_counters *counters;
1589 const struct xt_table_info *private = table->private;
1594 struct ip6t_entry *iter;
1596 counters = alloc_counters(table);
1597 if (IS_ERR(counters))
1598 return PTR_ERR(counters);
1602 xt_entry_foreach(iter, private->entries, total_size) {
1603 ret = compat_copy_entry_to_user(iter, &pos,
1604 &size, counters, i++);
1614 compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1618 struct compat_ip6t_get_entries get;
1621 if (*len < sizeof(get))
1624 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1627 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size)
1630 get.name[sizeof(get.name) - 1] = '\0';
1632 xt_compat_lock(AF_INET6);
1633 t = xt_find_table_lock(net, AF_INET6, get.name);
1635 const struct xt_table_info *private = t->private;
1636 struct xt_table_info info;
1637 ret = compat_table_info(private, &info);
1638 if (!ret && get.size == info.size)
1639 ret = compat_copy_entries_to_user(private->size,
1640 t, uptr->entrytable);
1644 xt_compat_flush_offsets(AF_INET6);
1650 xt_compat_unlock(AF_INET6);
1654 static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1657 compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1661 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1665 case IP6T_SO_GET_INFO:
1666 ret = get_info(sock_net(sk), user, len, 1);
1668 case IP6T_SO_GET_ENTRIES:
1669 ret = compat_get_entries(sock_net(sk), user, len);
1672 ret = do_ip6t_get_ctl(sk, cmd, user, len);
1679 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1683 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1687 case IP6T_SO_SET_REPLACE:
1688 ret = do_replace(sock_net(sk), user, len);
1691 case IP6T_SO_SET_ADD_COUNTERS:
1692 ret = do_add_counters(sock_net(sk), user, len, 0);
1703 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1707 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1711 case IP6T_SO_GET_INFO:
1712 ret = get_info(sock_net(sk), user, len, 0);
1715 case IP6T_SO_GET_ENTRIES:
1716 ret = get_entries(sock_net(sk), user, len);
1719 case IP6T_SO_GET_REVISION_MATCH:
1720 case IP6T_SO_GET_REVISION_TARGET: {
1721 struct xt_get_revision rev;
1724 if (*len != sizeof(rev)) {
1728 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1732 rev.name[sizeof(rev.name)-1] = 0;
1734 if (cmd == IP6T_SO_GET_REVISION_TARGET)
1739 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
1742 "ip6t_%s", rev.name);
1753 static void __ip6t_unregister_table(struct net *net, struct xt_table *table)
1755 struct xt_table_info *private;
1756 void *loc_cpu_entry;
1757 struct module *table_owner = table->me;
1758 struct ip6t_entry *iter;
1760 private = xt_unregister_table(table);
1762 /* Decrease module usage counts and free resources */
1763 loc_cpu_entry = private->entries;
1764 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1765 cleanup_entry(iter, net);
1766 if (private->number > private->initial_entries)
1767 module_put(table_owner);
1768 xt_free_table_info(private);
1771 int ip6t_register_table(struct net *net, const struct xt_table *table,
1772 const struct ip6t_replace *repl,
1773 const struct nf_hook_ops *ops,
1774 struct xt_table **res)
1777 struct xt_table_info *newinfo;
1778 struct xt_table_info bootstrap = {0};
1779 void *loc_cpu_entry;
1780 struct xt_table *new_table;
1782 newinfo = xt_alloc_table_info(repl->size);
1786 loc_cpu_entry = newinfo->entries;
1787 memcpy(loc_cpu_entry, repl->entries, repl->size);
1789 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1793 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1794 if (IS_ERR(new_table)) {
1795 ret = PTR_ERR(new_table);
1799 /* set res now, will see skbs right after nf_register_net_hooks */
1800 WRITE_ONCE(*res, new_table);
1802 ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
1804 __ip6t_unregister_table(net, new_table);
1811 xt_free_table_info(newinfo);
1815 void ip6t_unregister_table(struct net *net, struct xt_table *table,
1816 const struct nf_hook_ops *ops)
1818 nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
1819 __ip6t_unregister_table(net, table);
1822 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
1824 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
1825 u_int8_t type, u_int8_t code,
1828 return (type == test_type && code >= min_code && code <= max_code)
1833 icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
1835 const struct icmp6hdr *ic;
1836 struct icmp6hdr _icmph;
1837 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1839 /* Must not be a fragment. */
1840 if (par->fragoff != 0)
1843 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
1845 /* We've been asked to examine this packet, and we
1846 * can't. Hence, no choice but to drop.
1848 par->hotdrop = true;
1852 return icmp6_type_code_match(icmpinfo->type,
1855 ic->icmp6_type, ic->icmp6_code,
1856 !!(icmpinfo->invflags&IP6T_ICMP_INV));
1859 /* Called when user tries to insert an entry of this type. */
1860 static int icmp6_checkentry(const struct xt_mtchk_param *par)
1862 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1864 /* Must specify no unknown invflags */
1865 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
1868 /* The built-in targets: standard (NULL) and error. */
1869 static struct xt_target ip6t_builtin_tg[] __read_mostly = {
1871 .name = XT_STANDARD_TARGET,
1872 .targetsize = sizeof(int),
1873 .family = NFPROTO_IPV6,
1874 #ifdef CONFIG_COMPAT
1875 .compatsize = sizeof(compat_int_t),
1876 .compat_from_user = compat_standard_from_user,
1877 .compat_to_user = compat_standard_to_user,
1881 .name = XT_ERROR_TARGET,
1882 .target = ip6t_error,
1883 .targetsize = XT_FUNCTION_MAXNAMELEN,
1884 .family = NFPROTO_IPV6,
1888 static struct nf_sockopt_ops ip6t_sockopts = {
1890 .set_optmin = IP6T_BASE_CTL,
1891 .set_optmax = IP6T_SO_SET_MAX+1,
1892 .set = do_ip6t_set_ctl,
1893 #ifdef CONFIG_COMPAT
1894 .compat_set = compat_do_ip6t_set_ctl,
1896 .get_optmin = IP6T_BASE_CTL,
1897 .get_optmax = IP6T_SO_GET_MAX+1,
1898 .get = do_ip6t_get_ctl,
1899 #ifdef CONFIG_COMPAT
1900 .compat_get = compat_do_ip6t_get_ctl,
1902 .owner = THIS_MODULE,
1905 static struct xt_match ip6t_builtin_mt[] __read_mostly = {
1908 .match = icmp6_match,
1909 .matchsize = sizeof(struct ip6t_icmp),
1910 .checkentry = icmp6_checkentry,
1911 .proto = IPPROTO_ICMPV6,
1912 .family = NFPROTO_IPV6,
1917 static int __net_init ip6_tables_net_init(struct net *net)
1919 return xt_proto_init(net, NFPROTO_IPV6);
1922 static void __net_exit ip6_tables_net_exit(struct net *net)
1924 xt_proto_fini(net, NFPROTO_IPV6);
1927 static struct pernet_operations ip6_tables_net_ops = {
1928 .init = ip6_tables_net_init,
1929 .exit = ip6_tables_net_exit,
1932 static int __init ip6_tables_init(void)
1936 ret = register_pernet_subsys(&ip6_tables_net_ops);
1940 /* No one else will be downing sem now, so we won't sleep */
1941 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1944 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1948 /* Register setsockopt */
1949 ret = nf_register_sockopt(&ip6t_sockopts);
1953 pr_info("(C) 2000-2006 Netfilter Core Team\n");
1957 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1959 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1961 unregister_pernet_subsys(&ip6_tables_net_ops);
1966 static void __exit ip6_tables_fini(void)
1968 nf_unregister_sockopt(&ip6t_sockopts);
1970 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1971 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1972 unregister_pernet_subsys(&ip6_tables_net_ops);
1975 EXPORT_SYMBOL(ip6t_register_table);
1976 EXPORT_SYMBOL(ip6t_unregister_table);
1977 EXPORT_SYMBOL(ip6t_do_table);
1979 module_init(ip6_tables_init);
1980 module_exit(ip6_tables_fini);