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 #ifdef CONFIG_NETFILTER_DEBUG
43 #define IP_NF_ASSERT(x) WARN_ON(!(x))
45 #define IP_NF_ASSERT(x)
48 void *ip6t_alloc_initial_table(const struct xt_table *info)
50 return xt_alloc_initial_table(ip6t, IP6T);
52 EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
55 We keep a set of rules for each CPU, so we can avoid write-locking
56 them in the softirq when updating the counters and therefore
57 only need to read-lock in the softirq; doing a write_lock_bh() in user
58 context stops packets coming through and allows user context to read
59 the counters or update the rules.
61 Hence the start of any table is given by get_table() below. */
63 /* Returns whether matches rule or not. */
64 /* Performance critical - called for every packet */
66 ip6_packet_match(const struct sk_buff *skb,
69 const struct ip6t_ip6 *ip6info,
70 unsigned int *protoff,
71 int *fragoff, bool *hotdrop)
74 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
76 if (NF_INVF(ip6info, IP6T_INV_SRCIP,
77 ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
79 NF_INVF(ip6info, IP6T_INV_DSTIP,
80 ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
84 ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
86 if (NF_INVF(ip6info, IP6T_INV_VIA_IN, ret != 0))
89 ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
91 if (NF_INVF(ip6info, IP6T_INV_VIA_OUT, ret != 0))
94 /* ... might want to do something with class and flowlabel here ... */
96 /* look for the desired protocol header */
97 if (ip6info->flags & IP6T_F_PROTO) {
99 unsigned short _frag_off;
101 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL);
107 *fragoff = _frag_off;
109 if (ip6info->proto == protohdr) {
110 if (ip6info->invflags & IP6T_INV_PROTO)
116 /* We need match for the '-p all', too! */
117 if ((ip6info->proto != 0) &&
118 !(ip6info->invflags & IP6T_INV_PROTO))
124 /* should be ip6 safe */
126 ip6_checkentry(const struct ip6t_ip6 *ipv6)
128 if (ipv6->flags & ~IP6T_F_MASK)
130 if (ipv6->invflags & ~IP6T_INV_MASK)
137 ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
139 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
144 static inline struct ip6t_entry *
145 get_entry(const void *base, unsigned int offset)
147 return (struct ip6t_entry *)(base + offset);
150 /* All zeroes == unconditional rule. */
151 /* Mildly perf critical (only if packet tracing is on) */
152 static inline bool unconditional(const struct ip6t_entry *e)
154 static const struct ip6t_ip6 uncond;
156 return e->target_offset == sizeof(struct ip6t_entry) &&
157 memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0;
160 static inline const struct xt_entry_target *
161 ip6t_get_target_c(const struct ip6t_entry *e)
163 return ip6t_get_target((struct ip6t_entry *)e);
166 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
167 /* This cries for unification! */
168 static const char *const hooknames[] = {
169 [NF_INET_PRE_ROUTING] = "PREROUTING",
170 [NF_INET_LOCAL_IN] = "INPUT",
171 [NF_INET_FORWARD] = "FORWARD",
172 [NF_INET_LOCAL_OUT] = "OUTPUT",
173 [NF_INET_POST_ROUTING] = "POSTROUTING",
176 enum nf_ip_trace_comments {
177 NF_IP6_TRACE_COMMENT_RULE,
178 NF_IP6_TRACE_COMMENT_RETURN,
179 NF_IP6_TRACE_COMMENT_POLICY,
182 static const char *const comments[] = {
183 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
184 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
185 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
188 static struct nf_loginfo trace_loginfo = {
189 .type = NF_LOG_TYPE_LOG,
192 .level = LOGLEVEL_WARNING,
193 .logflags = NF_LOG_DEFAULT_MASK,
198 /* Mildly perf critical (only if packet tracing is on) */
200 get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
201 const char *hookname, const char **chainname,
202 const char **comment, unsigned int *rulenum)
204 const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
206 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
207 /* Head of user chain: ERROR target with chainname */
208 *chainname = t->target.data;
213 if (unconditional(s) &&
214 strcmp(t->target.u.kernel.target->name,
215 XT_STANDARD_TARGET) == 0 &&
217 /* Tail of chains: STANDARD target (return/policy) */
218 *comment = *chainname == hookname
219 ? comments[NF_IP6_TRACE_COMMENT_POLICY]
220 : comments[NF_IP6_TRACE_COMMENT_RETURN];
229 static void trace_packet(struct net *net,
230 const struct sk_buff *skb,
232 const struct net_device *in,
233 const struct net_device *out,
234 const char *tablename,
235 const struct xt_table_info *private,
236 const struct ip6t_entry *e)
238 const struct ip6t_entry *root;
239 const char *hookname, *chainname, *comment;
240 const struct ip6t_entry *iter;
241 unsigned int rulenum = 0;
243 root = get_entry(private->entries, private->hook_entry[hook]);
245 hookname = chainname = hooknames[hook];
246 comment = comments[NF_IP6_TRACE_COMMENT_RULE];
248 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
249 if (get_chainname_rulenum(iter, e, hookname,
250 &chainname, &comment, &rulenum) != 0)
253 nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
254 "TRACE: %s:%s:%s:%u ",
255 tablename, chainname, comment, rulenum);
259 static inline struct ip6t_entry *
260 ip6t_next_entry(const struct ip6t_entry *entry)
262 return (void *)entry + entry->next_offset;
265 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
267 ip6t_do_table(struct sk_buff *skb,
268 const struct nf_hook_state *state,
269 struct xt_table *table)
271 unsigned int hook = state->hook;
272 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
273 /* Initializing verdict to NF_DROP keeps gcc happy. */
274 unsigned int verdict = NF_DROP;
275 const char *indev, *outdev;
276 const void *table_base;
277 struct ip6t_entry *e, **jumpstack;
278 unsigned int stackidx, cpu;
279 const struct xt_table_info *private;
280 struct xt_action_param acpar;
285 indev = state->in ? state->in->name : nulldevname;
286 outdev = state->out ? state->out->name : nulldevname;
287 /* We handle fragments by dealing with the first fragment as
288 * if it was a normal packet. All other fragments are treated
289 * normally, except that they will NEVER match rules that ask
290 * things we don't know, ie. tcp syn flag or ports). If the
291 * rule is also a fragment-specific rule, non-fragments won't
293 acpar.hotdrop = false;
296 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
299 addend = xt_write_recseq_begin();
300 private = table->private;
302 * Ensure we load private-> members after we've fetched the base
305 smp_read_barrier_depends();
306 cpu = smp_processor_id();
307 table_base = private->entries;
308 jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
310 /* Switch to alternate jumpstack if we're being invoked via TEE.
311 * TEE issues XT_CONTINUE verdict on original skb so we must not
312 * clobber the jumpstack.
314 * For recursion via REJECT or SYNPROXY the stack will be clobbered
315 * but it is no problem since absolute verdict is issued by these.
317 if (static_key_false(&xt_tee_enabled))
318 jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
320 e = get_entry(table_base, private->hook_entry[hook]);
323 const struct xt_entry_target *t;
324 const struct xt_entry_match *ematch;
325 struct xt_counters *counter;
329 if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
330 &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
332 e = ip6t_next_entry(e);
336 xt_ematch_foreach(ematch, e) {
337 acpar.match = ematch->u.kernel.match;
338 acpar.matchinfo = ematch->data;
339 if (!acpar.match->match(skb, &acpar))
343 counter = xt_get_this_cpu_counter(&e->counters);
344 ADD_COUNTER(*counter, skb->len, 1);
346 t = ip6t_get_target_c(e);
347 IP_NF_ASSERT(t->u.kernel.target);
349 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
350 /* The packet is traced: log it */
351 if (unlikely(skb->nf_trace))
352 trace_packet(state->net, skb, hook, state->in,
353 state->out, table->name, private, e);
355 /* Standard target? */
356 if (!t->u.kernel.target->target) {
359 v = ((struct xt_standard_target *)t)->verdict;
361 /* Pop from stack? */
362 if (v != XT_RETURN) {
363 verdict = (unsigned int)(-v) - 1;
367 e = get_entry(table_base,
368 private->underflow[hook]);
370 e = ip6t_next_entry(jumpstack[--stackidx]);
373 if (table_base + v != ip6t_next_entry(e) &&
374 !(e->ipv6.flags & IP6T_F_GOTO)) {
375 jumpstack[stackidx++] = e;
378 e = get_entry(table_base, v);
382 acpar.target = t->u.kernel.target;
383 acpar.targinfo = t->data;
385 verdict = t->u.kernel.target->target(skb, &acpar);
386 if (verdict == XT_CONTINUE)
387 e = ip6t_next_entry(e);
391 } while (!acpar.hotdrop);
393 xt_write_recseq_end(addend);
401 /* Figures out from what hook each rule can be called: returns 0 if
402 there are loops. Puts hook bitmask in comefrom. */
404 mark_source_chains(const struct xt_table_info *newinfo,
405 unsigned int valid_hooks, void *entry0,
406 unsigned int *offsets)
410 /* No recursion; use packet counter to save back ptrs (reset
411 to 0 as we leave), and comefrom to save source hook bitmask */
412 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
413 unsigned int pos = newinfo->hook_entry[hook];
414 struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos);
416 if (!(valid_hooks & (1 << hook)))
419 /* Set initial back pointer. */
420 e->counters.pcnt = pos;
423 const struct xt_standard_target *t
424 = (void *)ip6t_get_target_c(e);
425 int visited = e->comefrom & (1 << hook);
427 if (e->comefrom & (1 << NF_INET_NUMHOOKS))
430 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
432 /* Unconditional return/END. */
433 if ((unconditional(e) &&
434 (strcmp(t->target.u.user.name,
435 XT_STANDARD_TARGET) == 0) &&
436 t->verdict < 0) || visited) {
437 unsigned int oldpos, size;
439 if ((strcmp(t->target.u.user.name,
440 XT_STANDARD_TARGET) == 0) &&
441 t->verdict < -NF_MAX_VERDICT - 1)
444 /* Return: backtrack through the last
447 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
449 pos = e->counters.pcnt;
450 e->counters.pcnt = 0;
452 /* We're at the start. */
456 e = (struct ip6t_entry *)
458 } while (oldpos == pos + e->next_offset);
461 size = e->next_offset;
462 e = (struct ip6t_entry *)
463 (entry0 + pos + size);
464 if (pos + size >= newinfo->size)
466 e->counters.pcnt = pos;
469 int newpos = t->verdict;
471 if (strcmp(t->target.u.user.name,
472 XT_STANDARD_TARGET) == 0 &&
474 /* This a jump; chase it. */
475 if (!xt_find_jump_offset(offsets, newpos,
478 e = (struct ip6t_entry *)
481 /* ... this is a fallthru */
482 newpos = pos + e->next_offset;
483 if (newpos >= newinfo->size)
486 e = (struct ip6t_entry *)
488 e->counters.pcnt = pos;
497 static void cleanup_match(struct xt_entry_match *m, struct net *net)
499 struct xt_mtdtor_param par;
502 par.match = m->u.kernel.match;
503 par.matchinfo = m->data;
504 par.family = NFPROTO_IPV6;
505 if (par.match->destroy != NULL)
506 par.match->destroy(&par);
507 module_put(par.match->me);
510 static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
512 const struct ip6t_ip6 *ipv6 = par->entryinfo;
514 par->match = m->u.kernel.match;
515 par->matchinfo = m->data;
517 return xt_check_match(par, m->u.match_size - sizeof(*m),
518 ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
522 find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
524 struct xt_match *match;
527 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
530 return PTR_ERR(match);
532 m->u.kernel.match = match;
534 ret = check_match(m, par);
540 module_put(m->u.kernel.match->me);
544 static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
546 struct xt_entry_target *t = ip6t_get_target(e);
547 struct xt_tgchk_param par = {
551 .target = t->u.kernel.target,
553 .hook_mask = e->comefrom,
554 .family = NFPROTO_IPV6,
557 t = ip6t_get_target(e);
558 return xt_check_target(&par, t->u.target_size - sizeof(*t),
560 e->ipv6.invflags & IP6T_INV_PROTO);
564 find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
566 struct xt_percpu_counter_alloc_state *alloc_state)
568 struct xt_entry_target *t;
569 struct xt_target *target;
572 struct xt_mtchk_param mtpar;
573 struct xt_entry_match *ematch;
575 if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
581 mtpar.entryinfo = &e->ipv6;
582 mtpar.hook_mask = e->comefrom;
583 mtpar.family = NFPROTO_IPV6;
584 xt_ematch_foreach(ematch, e) {
585 ret = find_check_match(ematch, &mtpar);
587 goto cleanup_matches;
591 t = ip6t_get_target(e);
592 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
594 if (IS_ERR(target)) {
595 ret = PTR_ERR(target);
596 goto cleanup_matches;
598 t->u.kernel.target = target;
600 ret = check_target(e, net, name);
605 module_put(t->u.kernel.target->me);
607 xt_ematch_foreach(ematch, e) {
610 cleanup_match(ematch, net);
613 xt_percpu_counter_free(&e->counters);
618 static bool check_underflow(const struct ip6t_entry *e)
620 const struct xt_entry_target *t;
621 unsigned int verdict;
623 if (!unconditional(e))
625 t = ip6t_get_target_c(e);
626 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
628 verdict = ((struct xt_standard_target *)t)->verdict;
629 verdict = -verdict - 1;
630 return verdict == NF_DROP || verdict == NF_ACCEPT;
634 check_entry_size_and_hooks(struct ip6t_entry *e,
635 struct xt_table_info *newinfo,
636 const unsigned char *base,
637 const unsigned char *limit,
638 const unsigned int *hook_entries,
639 const unsigned int *underflows,
640 unsigned int valid_hooks)
645 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
646 (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
647 (unsigned char *)e + e->next_offset > limit)
651 < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target))
654 if (!ip6_checkentry(&e->ipv6))
657 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
662 /* Check hooks & underflows */
663 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
664 if (!(valid_hooks & (1 << h)))
666 if ((unsigned char *)e - base == hook_entries[h])
667 newinfo->hook_entry[h] = hook_entries[h];
668 if ((unsigned char *)e - base == underflows[h]) {
669 if (!check_underflow(e))
672 newinfo->underflow[h] = underflows[h];
676 /* Clear counters and comefrom */
677 e->counters = ((struct xt_counters) { 0, 0 });
682 static void cleanup_entry(struct ip6t_entry *e, struct net *net)
684 struct xt_tgdtor_param par;
685 struct xt_entry_target *t;
686 struct xt_entry_match *ematch;
688 /* Cleanup all matches */
689 xt_ematch_foreach(ematch, e)
690 cleanup_match(ematch, net);
691 t = ip6t_get_target(e);
694 par.target = t->u.kernel.target;
695 par.targinfo = t->data;
696 par.family = NFPROTO_IPV6;
697 if (par.target->destroy != NULL)
698 par.target->destroy(&par);
699 module_put(par.target->me);
700 xt_percpu_counter_free(&e->counters);
703 /* Checks and translates the user-supplied table segment (held in
706 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
707 const struct ip6t_replace *repl)
709 struct xt_percpu_counter_alloc_state alloc_state = { 0 };
710 struct ip6t_entry *iter;
711 unsigned int *offsets;
715 newinfo->size = repl->size;
716 newinfo->number = repl->num_entries;
718 /* Init all hooks to impossible value. */
719 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
720 newinfo->hook_entry[i] = 0xFFFFFFFF;
721 newinfo->underflow[i] = 0xFFFFFFFF;
724 offsets = xt_alloc_entry_offsets(newinfo->number);
728 /* Walk through entries, checking offsets. */
729 xt_entry_foreach(iter, entry0, newinfo->size) {
730 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
737 if (i < repl->num_entries)
738 offsets[i] = (void *)iter - entry0;
740 if (strcmp(ip6t_get_target(iter)->u.user.name,
741 XT_ERROR_TARGET) == 0)
742 ++newinfo->stacksize;
746 if (i != repl->num_entries)
749 /* Check hooks all assigned */
750 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
751 /* Only hooks which are valid */
752 if (!(repl->valid_hooks & (1 << i)))
754 if (newinfo->hook_entry[i] == 0xFFFFFFFF)
756 if (newinfo->underflow[i] == 0xFFFFFFFF)
760 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
766 /* Finally, each sanity check must pass */
768 xt_entry_foreach(iter, entry0, newinfo->size) {
769 ret = find_check_entry(iter, net, repl->name, repl->size,
777 xt_entry_foreach(iter, entry0, newinfo->size) {
780 cleanup_entry(iter, net);
792 get_counters(const struct xt_table_info *t,
793 struct xt_counters counters[])
795 struct ip6t_entry *iter;
799 for_each_possible_cpu(cpu) {
800 seqcount_t *s = &per_cpu(xt_recseq, cpu);
803 xt_entry_foreach(iter, t->entries, t->size) {
804 struct xt_counters *tmp;
808 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
810 start = read_seqcount_begin(s);
813 } while (read_seqcount_retry(s, start));
815 ADD_COUNTER(counters[i], bcnt, pcnt);
821 static struct xt_counters *alloc_counters(const struct xt_table *table)
823 unsigned int countersize;
824 struct xt_counters *counters;
825 const struct xt_table_info *private = table->private;
827 /* We need atomic snapshot of counters: rest doesn't change
828 (other than comefrom, which userspace doesn't care
830 countersize = sizeof(struct xt_counters) * private->number;
831 counters = vzalloc(countersize);
833 if (counters == NULL)
834 return ERR_PTR(-ENOMEM);
836 get_counters(private, counters);
842 copy_entries_to_user(unsigned int total_size,
843 const struct xt_table *table,
844 void __user *userptr)
846 unsigned int off, num;
847 const struct ip6t_entry *e;
848 struct xt_counters *counters;
849 const struct xt_table_info *private = table->private;
851 const void *loc_cpu_entry;
853 counters = alloc_counters(table);
854 if (IS_ERR(counters))
855 return PTR_ERR(counters);
857 loc_cpu_entry = private->entries;
858 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
863 /* FIXME: use iterator macros --RR */
864 /* ... then go back and fix counters and names */
865 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
867 const struct xt_entry_match *m;
868 const struct xt_entry_target *t;
870 e = (struct ip6t_entry *)(loc_cpu_entry + off);
871 if (copy_to_user(userptr + off
872 + offsetof(struct ip6t_entry, counters),
874 sizeof(counters[num])) != 0) {
879 for (i = sizeof(struct ip6t_entry);
880 i < e->target_offset;
881 i += m->u.match_size) {
884 if (copy_to_user(userptr + off + i
885 + offsetof(struct xt_entry_match,
887 m->u.kernel.match->name,
888 strlen(m->u.kernel.match->name)+1)
895 t = ip6t_get_target_c(e);
896 if (copy_to_user(userptr + off + e->target_offset
897 + offsetof(struct xt_entry_target,
899 t->u.kernel.target->name,
900 strlen(t->u.kernel.target->name)+1) != 0) {
912 static void compat_standard_from_user(void *dst, const void *src)
914 int v = *(compat_int_t *)src;
917 v += xt_compat_calc_jump(AF_INET6, v);
918 memcpy(dst, &v, sizeof(v));
921 static int compat_standard_to_user(void __user *dst, const void *src)
923 compat_int_t cv = *(int *)src;
926 cv -= xt_compat_calc_jump(AF_INET6, cv);
927 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
930 static int compat_calc_entry(const struct ip6t_entry *e,
931 const struct xt_table_info *info,
932 const void *base, struct xt_table_info *newinfo)
934 const struct xt_entry_match *ematch;
935 const struct xt_entry_target *t;
936 unsigned int entry_offset;
939 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
940 entry_offset = (void *)e - base;
941 xt_ematch_foreach(ematch, e)
942 off += xt_compat_match_offset(ematch->u.kernel.match);
943 t = ip6t_get_target_c(e);
944 off += xt_compat_target_offset(t->u.kernel.target);
945 newinfo->size -= off;
946 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
950 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
951 if (info->hook_entry[i] &&
952 (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
953 newinfo->hook_entry[i] -= off;
954 if (info->underflow[i] &&
955 (e < (struct ip6t_entry *)(base + info->underflow[i])))
956 newinfo->underflow[i] -= off;
961 static int compat_table_info(const struct xt_table_info *info,
962 struct xt_table_info *newinfo)
964 struct ip6t_entry *iter;
965 const void *loc_cpu_entry;
968 if (!newinfo || !info)
971 /* we dont care about newinfo->entries */
972 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
973 newinfo->initial_entries = 0;
974 loc_cpu_entry = info->entries;
975 xt_compat_init_offsets(AF_INET6, info->number);
976 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
977 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
985 static int get_info(struct net *net, void __user *user,
986 const int *len, int compat)
988 char name[XT_TABLE_MAXNAMELEN];
992 if (*len != sizeof(struct ip6t_getinfo))
995 if (copy_from_user(name, user, sizeof(name)) != 0)
998 name[XT_TABLE_MAXNAMELEN-1] = '\0';
1001 xt_compat_lock(AF_INET6);
1003 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1004 "ip6table_%s", name);
1006 struct ip6t_getinfo info;
1007 const struct xt_table_info *private = t->private;
1008 #ifdef CONFIG_COMPAT
1009 struct xt_table_info tmp;
1012 ret = compat_table_info(private, &tmp);
1013 xt_compat_flush_offsets(AF_INET6);
1017 memset(&info, 0, sizeof(info));
1018 info.valid_hooks = t->valid_hooks;
1019 memcpy(info.hook_entry, private->hook_entry,
1020 sizeof(info.hook_entry));
1021 memcpy(info.underflow, private->underflow,
1022 sizeof(info.underflow));
1023 info.num_entries = private->number;
1024 info.size = private->size;
1025 strcpy(info.name, name);
1027 if (copy_to_user(user, &info, *len) != 0)
1036 #ifdef CONFIG_COMPAT
1038 xt_compat_unlock(AF_INET6);
1044 get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
1048 struct ip6t_get_entries get;
1051 if (*len < sizeof(get))
1053 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1055 if (*len != sizeof(struct ip6t_get_entries) + get.size)
1058 get.name[sizeof(get.name) - 1] = '\0';
1060 t = xt_find_table_lock(net, AF_INET6, get.name);
1062 struct xt_table_info *private = t->private;
1063 if (get.size == private->size)
1064 ret = copy_entries_to_user(private->size,
1065 t, uptr->entrytable);
1078 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1079 struct xt_table_info *newinfo, unsigned int num_counters,
1080 void __user *counters_ptr)
1084 struct xt_table_info *oldinfo;
1085 struct xt_counters *counters;
1086 struct ip6t_entry *iter;
1089 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1095 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1096 "ip6table_%s", name);
1099 goto free_newinfo_counters_untrans;
1103 if (valid_hooks != t->valid_hooks) {
1108 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1112 /* Update module usage count based on number of rules */
1113 if ((oldinfo->number > oldinfo->initial_entries) ||
1114 (newinfo->number <= oldinfo->initial_entries))
1116 if ((oldinfo->number > oldinfo->initial_entries) &&
1117 (newinfo->number <= oldinfo->initial_entries))
1120 /* Get the old counters, and synchronize with replace */
1121 get_counters(oldinfo, counters);
1123 /* Decrease module usage counts and free resource */
1124 xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
1125 cleanup_entry(iter, net);
1127 xt_free_table_info(oldinfo);
1128 if (copy_to_user(counters_ptr, counters,
1129 sizeof(struct xt_counters) * num_counters) != 0) {
1130 /* Silent error, can't fail, new table is already in place */
1131 net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n");
1140 free_newinfo_counters_untrans:
1147 do_replace(struct net *net, const void __user *user, unsigned int len)
1150 struct ip6t_replace tmp;
1151 struct xt_table_info *newinfo;
1152 void *loc_cpu_entry;
1153 struct ip6t_entry *iter;
1155 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1158 /* overflow check */
1159 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1161 if (tmp.num_counters == 0)
1164 tmp.name[sizeof(tmp.name)-1] = 0;
1166 newinfo = xt_alloc_table_info(tmp.size);
1170 loc_cpu_entry = newinfo->entries;
1171 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1177 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1181 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1182 tmp.num_counters, tmp.counters);
1184 goto free_newinfo_untrans;
1187 free_newinfo_untrans:
1188 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1189 cleanup_entry(iter, net);
1191 xt_free_table_info(newinfo);
1196 do_add_counters(struct net *net, const void __user *user, unsigned int len,
1200 struct xt_counters_info tmp;
1201 struct xt_counters *paddc;
1203 const struct xt_table_info *private;
1205 struct ip6t_entry *iter;
1206 unsigned int addend;
1208 paddc = xt_copy_counters_from_user(user, len, &tmp, compat);
1210 return PTR_ERR(paddc);
1211 t = xt_find_table_lock(net, AF_INET6, tmp.name);
1218 private = t->private;
1219 if (private->number != tmp.num_counters) {
1221 goto unlock_up_free;
1225 addend = xt_write_recseq_begin();
1226 xt_entry_foreach(iter, private->entries, private->size) {
1227 struct xt_counters *tmp;
1229 tmp = xt_get_this_cpu_counter(&iter->counters);
1230 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1233 xt_write_recseq_end(addend);
1244 #ifdef CONFIG_COMPAT
1245 struct compat_ip6t_replace {
1246 char name[XT_TABLE_MAXNAMELEN];
1250 u32 hook_entry[NF_INET_NUMHOOKS];
1251 u32 underflow[NF_INET_NUMHOOKS];
1253 compat_uptr_t counters; /* struct xt_counters * */
1254 struct compat_ip6t_entry entries[0];
1258 compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
1259 unsigned int *size, struct xt_counters *counters,
1262 struct xt_entry_target *t;
1263 struct compat_ip6t_entry __user *ce;
1264 u_int16_t target_offset, next_offset;
1265 compat_uint_t origsize;
1266 const struct xt_entry_match *ematch;
1270 ce = (struct compat_ip6t_entry __user *)*dstptr;
1271 if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
1272 copy_to_user(&ce->counters, &counters[i],
1273 sizeof(counters[i])) != 0)
1276 *dstptr += sizeof(struct compat_ip6t_entry);
1277 *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1279 xt_ematch_foreach(ematch, e) {
1280 ret = xt_compat_match_to_user(ematch, dstptr, size);
1284 target_offset = e->target_offset - (origsize - *size);
1285 t = ip6t_get_target(e);
1286 ret = xt_compat_target_to_user(t, dstptr, size);
1289 next_offset = e->next_offset - (origsize - *size);
1290 if (put_user(target_offset, &ce->target_offset) != 0 ||
1291 put_user(next_offset, &ce->next_offset) != 0)
1297 compat_find_calc_match(struct xt_entry_match *m,
1298 const struct ip6t_ip6 *ipv6,
1301 struct xt_match *match;
1303 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
1304 m->u.user.revision);
1306 return PTR_ERR(match);
1308 m->u.kernel.match = match;
1309 *size += xt_compat_match_offset(match);
1313 static void compat_release_entry(struct compat_ip6t_entry *e)
1315 struct xt_entry_target *t;
1316 struct xt_entry_match *ematch;
1318 /* Cleanup all matches */
1319 xt_ematch_foreach(ematch, e)
1320 module_put(ematch->u.kernel.match->me);
1321 t = compat_ip6t_get_target(e);
1322 module_put(t->u.kernel.target->me);
1326 check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
1327 struct xt_table_info *newinfo,
1329 const unsigned char *base,
1330 const unsigned char *limit)
1332 struct xt_entry_match *ematch;
1333 struct xt_entry_target *t;
1334 struct xt_target *target;
1335 unsigned int entry_offset;
1339 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1340 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
1341 (unsigned char *)e + e->next_offset > limit)
1344 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1345 sizeof(struct compat_xt_entry_target))
1348 if (!ip6_checkentry(&e->ipv6))
1351 ret = xt_compat_check_entry_offsets(e, e->elems,
1352 e->target_offset, e->next_offset);
1356 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1357 entry_offset = (void *)e - (void *)base;
1359 xt_ematch_foreach(ematch, e) {
1360 ret = compat_find_calc_match(ematch, &e->ipv6, &off);
1362 goto release_matches;
1366 t = compat_ip6t_get_target(e);
1367 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1368 t->u.user.revision);
1369 if (IS_ERR(target)) {
1370 ret = PTR_ERR(target);
1371 goto release_matches;
1373 t->u.kernel.target = target;
1375 off += xt_compat_target_offset(target);
1377 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1384 module_put(t->u.kernel.target->me);
1386 xt_ematch_foreach(ematch, e) {
1389 module_put(ematch->u.kernel.match->me);
1395 compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1397 struct xt_table_info *newinfo, unsigned char *base)
1399 struct xt_entry_target *t;
1400 struct ip6t_entry *de;
1401 unsigned int origsize;
1403 struct xt_entry_match *ematch;
1406 de = (struct ip6t_entry *)*dstptr;
1407 memcpy(de, e, sizeof(struct ip6t_entry));
1408 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1410 *dstptr += sizeof(struct ip6t_entry);
1411 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1413 xt_ematch_foreach(ematch, e)
1414 xt_compat_match_from_user(ematch, dstptr, size);
1416 de->target_offset = e->target_offset - (origsize - *size);
1417 t = compat_ip6t_get_target(e);
1418 xt_compat_target_from_user(t, dstptr, size);
1420 de->next_offset = e->next_offset - (origsize - *size);
1421 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1422 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1423 newinfo->hook_entry[h] -= origsize - *size;
1424 if ((unsigned char *)de - base < newinfo->underflow[h])
1425 newinfo->underflow[h] -= origsize - *size;
1430 translate_compat_table(struct net *net,
1431 struct xt_table_info **pinfo,
1433 const struct compat_ip6t_replace *compatr)
1436 struct xt_table_info *newinfo, *info;
1437 void *pos, *entry0, *entry1;
1438 struct compat_ip6t_entry *iter0;
1439 struct ip6t_replace repl;
1445 size = compatr->size;
1446 info->number = compatr->num_entries;
1449 xt_compat_lock(AF_INET6);
1450 xt_compat_init_offsets(AF_INET6, compatr->num_entries);
1451 /* Walk through entries, checking offsets. */
1452 xt_entry_foreach(iter0, entry0, compatr->size) {
1453 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1455 entry0 + compatr->size);
1462 if (j != compatr->num_entries)
1466 newinfo = xt_alloc_table_info(size);
1470 newinfo->number = compatr->num_entries;
1471 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1472 newinfo->hook_entry[i] = compatr->hook_entry[i];
1473 newinfo->underflow[i] = compatr->underflow[i];
1475 entry1 = newinfo->entries;
1477 size = compatr->size;
1478 xt_entry_foreach(iter0, entry0, compatr->size)
1479 compat_copy_entry_from_user(iter0, &pos, &size,
1482 /* all module references in entry0 are now gone. */
1483 xt_compat_flush_offsets(AF_INET6);
1484 xt_compat_unlock(AF_INET6);
1486 memcpy(&repl, compatr, sizeof(*compatr));
1488 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1489 repl.hook_entry[i] = newinfo->hook_entry[i];
1490 repl.underflow[i] = newinfo->underflow[i];
1493 repl.num_counters = 0;
1494 repl.counters = NULL;
1495 repl.size = newinfo->size;
1496 ret = translate_table(net, newinfo, entry1, &repl);
1502 xt_free_table_info(info);
1506 xt_free_table_info(newinfo);
1509 xt_compat_flush_offsets(AF_INET6);
1510 xt_compat_unlock(AF_INET6);
1511 xt_entry_foreach(iter0, entry0, compatr->size) {
1514 compat_release_entry(iter0);
1520 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1523 struct compat_ip6t_replace tmp;
1524 struct xt_table_info *newinfo;
1525 void *loc_cpu_entry;
1526 struct ip6t_entry *iter;
1528 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1531 /* overflow check */
1532 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1534 if (tmp.num_counters == 0)
1537 tmp.name[sizeof(tmp.name)-1] = 0;
1539 newinfo = xt_alloc_table_info(tmp.size);
1543 loc_cpu_entry = newinfo->entries;
1544 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1550 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1554 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1555 tmp.num_counters, compat_ptr(tmp.counters));
1557 goto free_newinfo_untrans;
1560 free_newinfo_untrans:
1561 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1562 cleanup_entry(iter, net);
1564 xt_free_table_info(newinfo);
1569 compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1574 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1578 case IP6T_SO_SET_REPLACE:
1579 ret = compat_do_replace(sock_net(sk), user, len);
1582 case IP6T_SO_SET_ADD_COUNTERS:
1583 ret = do_add_counters(sock_net(sk), user, len, 1);
1593 struct compat_ip6t_get_entries {
1594 char name[XT_TABLE_MAXNAMELEN];
1596 struct compat_ip6t_entry entrytable[0];
1600 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1601 void __user *userptr)
1603 struct xt_counters *counters;
1604 const struct xt_table_info *private = table->private;
1609 struct ip6t_entry *iter;
1611 counters = alloc_counters(table);
1612 if (IS_ERR(counters))
1613 return PTR_ERR(counters);
1617 xt_entry_foreach(iter, private->entries, total_size) {
1618 ret = compat_copy_entry_to_user(iter, &pos,
1619 &size, counters, i++);
1629 compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1633 struct compat_ip6t_get_entries get;
1636 if (*len < sizeof(get))
1639 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1642 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size)
1645 get.name[sizeof(get.name) - 1] = '\0';
1647 xt_compat_lock(AF_INET6);
1648 t = xt_find_table_lock(net, AF_INET6, get.name);
1650 const struct xt_table_info *private = t->private;
1651 struct xt_table_info info;
1652 ret = compat_table_info(private, &info);
1653 if (!ret && get.size == info.size)
1654 ret = compat_copy_entries_to_user(private->size,
1655 t, uptr->entrytable);
1659 xt_compat_flush_offsets(AF_INET6);
1665 xt_compat_unlock(AF_INET6);
1669 static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1672 compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1676 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1680 case IP6T_SO_GET_INFO:
1681 ret = get_info(sock_net(sk), user, len, 1);
1683 case IP6T_SO_GET_ENTRIES:
1684 ret = compat_get_entries(sock_net(sk), user, len);
1687 ret = do_ip6t_get_ctl(sk, cmd, user, len);
1694 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1698 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1702 case IP6T_SO_SET_REPLACE:
1703 ret = do_replace(sock_net(sk), user, len);
1706 case IP6T_SO_SET_ADD_COUNTERS:
1707 ret = do_add_counters(sock_net(sk), user, len, 0);
1718 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1722 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1726 case IP6T_SO_GET_INFO:
1727 ret = get_info(sock_net(sk), user, len, 0);
1730 case IP6T_SO_GET_ENTRIES:
1731 ret = get_entries(sock_net(sk), user, len);
1734 case IP6T_SO_GET_REVISION_MATCH:
1735 case IP6T_SO_GET_REVISION_TARGET: {
1736 struct xt_get_revision rev;
1739 if (*len != sizeof(rev)) {
1743 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1747 rev.name[sizeof(rev.name)-1] = 0;
1749 if (cmd == IP6T_SO_GET_REVISION_TARGET)
1754 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
1757 "ip6t_%s", rev.name);
1768 static void __ip6t_unregister_table(struct net *net, struct xt_table *table)
1770 struct xt_table_info *private;
1771 void *loc_cpu_entry;
1772 struct module *table_owner = table->me;
1773 struct ip6t_entry *iter;
1775 private = xt_unregister_table(table);
1777 /* Decrease module usage counts and free resources */
1778 loc_cpu_entry = private->entries;
1779 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1780 cleanup_entry(iter, net);
1781 if (private->number > private->initial_entries)
1782 module_put(table_owner);
1783 xt_free_table_info(private);
1786 int ip6t_register_table(struct net *net, const struct xt_table *table,
1787 const struct ip6t_replace *repl,
1788 const struct nf_hook_ops *ops,
1789 struct xt_table **res)
1792 struct xt_table_info *newinfo;
1793 struct xt_table_info bootstrap = {0};
1794 void *loc_cpu_entry;
1795 struct xt_table *new_table;
1797 newinfo = xt_alloc_table_info(repl->size);
1801 loc_cpu_entry = newinfo->entries;
1802 memcpy(loc_cpu_entry, repl->entries, repl->size);
1804 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1808 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1809 if (IS_ERR(new_table)) {
1810 ret = PTR_ERR(new_table);
1814 /* set res now, will see skbs right after nf_register_net_hooks */
1815 WRITE_ONCE(*res, new_table);
1817 ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
1819 __ip6t_unregister_table(net, new_table);
1826 xt_free_table_info(newinfo);
1830 void ip6t_unregister_table(struct net *net, struct xt_table *table,
1831 const struct nf_hook_ops *ops)
1833 nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
1834 __ip6t_unregister_table(net, table);
1837 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
1839 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
1840 u_int8_t type, u_int8_t code,
1843 return (type == test_type && code >= min_code && code <= max_code)
1848 icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
1850 const struct icmp6hdr *ic;
1851 struct icmp6hdr _icmph;
1852 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1854 /* Must not be a fragment. */
1855 if (par->fragoff != 0)
1858 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
1860 /* We've been asked to examine this packet, and we
1861 * can't. Hence, no choice but to drop.
1863 par->hotdrop = true;
1867 return icmp6_type_code_match(icmpinfo->type,
1870 ic->icmp6_type, ic->icmp6_code,
1871 !!(icmpinfo->invflags&IP6T_ICMP_INV));
1874 /* Called when user tries to insert an entry of this type. */
1875 static int icmp6_checkentry(const struct xt_mtchk_param *par)
1877 const struct ip6t_icmp *icmpinfo = par->matchinfo;
1879 /* Must specify no unknown invflags */
1880 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
1883 /* The built-in targets: standard (NULL) and error. */
1884 static struct xt_target ip6t_builtin_tg[] __read_mostly = {
1886 .name = XT_STANDARD_TARGET,
1887 .targetsize = sizeof(int),
1888 .family = NFPROTO_IPV6,
1889 #ifdef CONFIG_COMPAT
1890 .compatsize = sizeof(compat_int_t),
1891 .compat_from_user = compat_standard_from_user,
1892 .compat_to_user = compat_standard_to_user,
1896 .name = XT_ERROR_TARGET,
1897 .target = ip6t_error,
1898 .targetsize = XT_FUNCTION_MAXNAMELEN,
1899 .family = NFPROTO_IPV6,
1903 static struct nf_sockopt_ops ip6t_sockopts = {
1905 .set_optmin = IP6T_BASE_CTL,
1906 .set_optmax = IP6T_SO_SET_MAX+1,
1907 .set = do_ip6t_set_ctl,
1908 #ifdef CONFIG_COMPAT
1909 .compat_set = compat_do_ip6t_set_ctl,
1911 .get_optmin = IP6T_BASE_CTL,
1912 .get_optmax = IP6T_SO_GET_MAX+1,
1913 .get = do_ip6t_get_ctl,
1914 #ifdef CONFIG_COMPAT
1915 .compat_get = compat_do_ip6t_get_ctl,
1917 .owner = THIS_MODULE,
1920 static struct xt_match ip6t_builtin_mt[] __read_mostly = {
1923 .match = icmp6_match,
1924 .matchsize = sizeof(struct ip6t_icmp),
1925 .checkentry = icmp6_checkentry,
1926 .proto = IPPROTO_ICMPV6,
1927 .family = NFPROTO_IPV6,
1931 static int __net_init ip6_tables_net_init(struct net *net)
1933 return xt_proto_init(net, NFPROTO_IPV6);
1936 static void __net_exit ip6_tables_net_exit(struct net *net)
1938 xt_proto_fini(net, NFPROTO_IPV6);
1941 static struct pernet_operations ip6_tables_net_ops = {
1942 .init = ip6_tables_net_init,
1943 .exit = ip6_tables_net_exit,
1946 static int __init ip6_tables_init(void)
1950 ret = register_pernet_subsys(&ip6_tables_net_ops);
1954 /* No one else will be downing sem now, so we won't sleep */
1955 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1958 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1962 /* Register setsockopt */
1963 ret = nf_register_sockopt(&ip6t_sockopts);
1967 pr_info("(C) 2000-2006 Netfilter Core Team\n");
1971 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1973 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1975 unregister_pernet_subsys(&ip6_tables_net_ops);
1980 static void __exit ip6_tables_fini(void)
1982 nf_unregister_sockopt(&ip6t_sockopts);
1984 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
1985 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
1986 unregister_pernet_subsys(&ip6_tables_net_ops);
1989 EXPORT_SYMBOL(ip6t_register_table);
1990 EXPORT_SYMBOL(ip6t_unregister_table);
1991 EXPORT_SYMBOL(ip6t_do_table);
1993 module_init(ip6_tables_init);
1994 module_exit(ip6_tables_fini);