1 // SPDX-License-Identifier: GPL-2.0-only
3 * Packet matching code.
5 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
6 * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
7 * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/cache.h>
11 #include <linux/capability.h>
12 #include <linux/skbuff.h>
13 #include <linux/kmod.h>
14 #include <linux/vmalloc.h>
15 #include <linux/netdevice.h>
16 #include <linux/module.h>
17 #include <linux/icmp.h>
19 #include <net/compat.h>
20 #include <linux/uaccess.h>
21 #include <linux/mutex.h>
22 #include <linux/proc_fs.h>
23 #include <linux/err.h>
24 #include <linux/cpumask.h>
26 #include <linux/netfilter/x_tables.h>
27 #include <linux/netfilter_ipv4/ip_tables.h>
28 #include <net/netfilter/nf_log.h>
29 #include "../../netfilter/xt_repldata.h"
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
33 MODULE_DESCRIPTION("IPv4 packet filter");
34 MODULE_ALIAS("ipt_icmp");
36 void *ipt_alloc_initial_table(const struct xt_table *info)
38 return xt_alloc_initial_table(ipt, IPT);
40 EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
42 /* Returns whether matches rule or not. */
43 /* Performance critical - called for every packet */
45 ip_packet_match(const struct iphdr *ip,
48 const struct ipt_ip *ipinfo,
53 if (NF_INVF(ipinfo, IPT_INV_SRCIP,
54 (ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) ||
55 NF_INVF(ipinfo, IPT_INV_DSTIP,
56 (ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr))
59 ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
61 if (NF_INVF(ipinfo, IPT_INV_VIA_IN, ret != 0))
64 ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
66 if (NF_INVF(ipinfo, IPT_INV_VIA_OUT, ret != 0))
69 /* Check specific protocol */
71 NF_INVF(ipinfo, IPT_INV_PROTO, ip->protocol != ipinfo->proto))
74 /* If we have a fragment rule but the packet is not a fragment
75 * then we return zero */
76 if (NF_INVF(ipinfo, IPT_INV_FRAG,
77 (ipinfo->flags & IPT_F_FRAG) && !isfrag))
84 ip_checkentry(const struct ipt_ip *ip)
86 if (ip->flags & ~IPT_F_MASK)
88 if (ip->invflags & ~IPT_INV_MASK)
94 ipt_error(struct sk_buff *skb, const struct xt_action_param *par)
96 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
101 /* Performance critical */
102 static inline struct ipt_entry *
103 get_entry(const void *base, unsigned int offset)
105 return (struct ipt_entry *)(base + offset);
108 /* All zeroes == unconditional rule. */
109 /* Mildly perf critical (only if packet tracing is on) */
110 static inline bool unconditional(const struct ipt_entry *e)
112 static const struct ipt_ip uncond;
114 return e->target_offset == sizeof(struct ipt_entry) &&
115 memcmp(&e->ip, &uncond, sizeof(uncond)) == 0;
118 /* for const-correctness */
119 static inline const struct xt_entry_target *
120 ipt_get_target_c(const struct ipt_entry *e)
122 return ipt_get_target((struct ipt_entry *)e);
125 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
126 static const char *const hooknames[] = {
127 [NF_INET_PRE_ROUTING] = "PREROUTING",
128 [NF_INET_LOCAL_IN] = "INPUT",
129 [NF_INET_FORWARD] = "FORWARD",
130 [NF_INET_LOCAL_OUT] = "OUTPUT",
131 [NF_INET_POST_ROUTING] = "POSTROUTING",
134 enum nf_ip_trace_comments {
135 NF_IP_TRACE_COMMENT_RULE,
136 NF_IP_TRACE_COMMENT_RETURN,
137 NF_IP_TRACE_COMMENT_POLICY,
140 static const char *const comments[] = {
141 [NF_IP_TRACE_COMMENT_RULE] = "rule",
142 [NF_IP_TRACE_COMMENT_RETURN] = "return",
143 [NF_IP_TRACE_COMMENT_POLICY] = "policy",
146 static const struct nf_loginfo trace_loginfo = {
147 .type = NF_LOG_TYPE_LOG,
151 .logflags = NF_LOG_DEFAULT_MASK,
156 /* Mildly perf critical (only if packet tracing is on) */
158 get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e,
159 const char *hookname, const char **chainname,
160 const char **comment, unsigned int *rulenum)
162 const struct xt_standard_target *t = (void *)ipt_get_target_c(s);
164 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
165 /* Head of user chain: ERROR target with chainname */
166 *chainname = t->target.data;
171 if (unconditional(s) &&
172 strcmp(t->target.u.kernel.target->name,
173 XT_STANDARD_TARGET) == 0 &&
175 /* Tail of chains: STANDARD target (return/policy) */
176 *comment = *chainname == hookname
177 ? comments[NF_IP_TRACE_COMMENT_POLICY]
178 : comments[NF_IP_TRACE_COMMENT_RETURN];
187 static void trace_packet(struct net *net,
188 const struct sk_buff *skb,
190 const struct net_device *in,
191 const struct net_device *out,
192 const char *tablename,
193 const struct xt_table_info *private,
194 const struct ipt_entry *e)
196 const struct ipt_entry *root;
197 const char *hookname, *chainname, *comment;
198 const struct ipt_entry *iter;
199 unsigned int rulenum = 0;
201 root = get_entry(private->entries, private->hook_entry[hook]);
203 hookname = chainname = hooknames[hook];
204 comment = comments[NF_IP_TRACE_COMMENT_RULE];
206 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
207 if (get_chainname_rulenum(iter, e, hookname,
208 &chainname, &comment, &rulenum) != 0)
211 nf_log_trace(net, AF_INET, hook, skb, in, out, &trace_loginfo,
212 "TRACE: %s:%s:%s:%u ",
213 tablename, chainname, comment, rulenum);
218 struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry)
220 return (void *)entry + entry->next_offset;
223 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
225 ipt_do_table(void *priv,
227 const struct nf_hook_state *state)
229 const struct xt_table *table = priv;
230 unsigned int hook = state->hook;
231 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
232 const struct iphdr *ip;
233 /* Initializing verdict to NF_DROP keeps gcc happy. */
234 unsigned int verdict = NF_DROP;
235 const char *indev, *outdev;
236 const void *table_base;
237 struct ipt_entry *e, **jumpstack;
238 unsigned int stackidx, cpu;
239 const struct xt_table_info *private;
240 struct xt_action_param acpar;
246 indev = state->in ? state->in->name : nulldevname;
247 outdev = state->out ? state->out->name : nulldevname;
248 /* We handle fragments by dealing with the first fragment as
249 * if it was a normal packet. All other fragments are treated
250 * normally, except that they will NEVER match rules that ask
251 * things we don't know, ie. tcp syn flag or ports). If the
252 * rule is also a fragment-specific rule, non-fragments won't
254 acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
255 acpar.thoff = ip_hdrlen(skb);
256 acpar.hotdrop = false;
259 WARN_ON(!(table->valid_hooks & (1 << hook)));
261 addend = xt_write_recseq_begin();
262 private = READ_ONCE(table->private); /* Address dependency. */
263 cpu = smp_processor_id();
264 table_base = private->entries;
265 jumpstack = (struct ipt_entry **)private->jumpstack[cpu];
267 /* Switch to alternate jumpstack if we're being invoked via TEE.
268 * TEE issues XT_CONTINUE verdict on original skb so we must not
269 * clobber the jumpstack.
271 * For recursion via REJECT or SYNPROXY the stack will be clobbered
272 * but it is no problem since absolute verdict is issued by these.
274 if (static_key_false(&xt_tee_enabled))
275 jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
277 e = get_entry(table_base, private->hook_entry[hook]);
280 const struct xt_entry_target *t;
281 const struct xt_entry_match *ematch;
282 struct xt_counters *counter;
285 if (!ip_packet_match(ip, indev, outdev,
286 &e->ip, acpar.fragoff)) {
288 e = ipt_next_entry(e);
292 xt_ematch_foreach(ematch, e) {
293 acpar.match = ematch->u.kernel.match;
294 acpar.matchinfo = ematch->data;
295 if (!acpar.match->match(skb, &acpar))
299 counter = xt_get_this_cpu_counter(&e->counters);
300 ADD_COUNTER(*counter, skb->len, 1);
302 t = ipt_get_target_c(e);
303 WARN_ON(!t->u.kernel.target);
305 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
306 /* The packet is traced: log it */
307 if (unlikely(skb->nf_trace))
308 trace_packet(state->net, skb, hook, state->in,
309 state->out, table->name, private, e);
311 /* Standard target? */
312 if (!t->u.kernel.target->target) {
315 v = ((struct xt_standard_target *)t)->verdict;
317 /* Pop from stack? */
318 if (v != XT_RETURN) {
319 verdict = (unsigned int)(-v) - 1;
323 e = get_entry(table_base,
324 private->underflow[hook]);
326 e = jumpstack[--stackidx];
327 e = ipt_next_entry(e);
331 if (table_base + v != ipt_next_entry(e) &&
332 !(e->ip.flags & IPT_F_GOTO)) {
333 if (unlikely(stackidx >= private->stacksize)) {
337 jumpstack[stackidx++] = e;
340 e = get_entry(table_base, v);
344 acpar.target = t->u.kernel.target;
345 acpar.targinfo = t->data;
347 verdict = t->u.kernel.target->target(skb, &acpar);
348 if (verdict == XT_CONTINUE) {
349 /* Target might have changed stuff. */
351 e = ipt_next_entry(e);
356 } while (!acpar.hotdrop);
358 xt_write_recseq_end(addend);
366 /* Figures out from what hook each rule can be called: returns 0 if
367 there are loops. Puts hook bitmask in comefrom. */
369 mark_source_chains(const struct xt_table_info *newinfo,
370 unsigned int valid_hooks, void *entry0,
371 unsigned int *offsets)
375 /* No recursion; use packet counter to save back ptrs (reset
376 to 0 as we leave), and comefrom to save source hook bitmask */
377 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
378 unsigned int pos = newinfo->hook_entry[hook];
379 struct ipt_entry *e = entry0 + pos;
381 if (!(valid_hooks & (1 << hook)))
384 /* Set initial back pointer. */
385 e->counters.pcnt = pos;
388 const struct xt_standard_target *t
389 = (void *)ipt_get_target_c(e);
390 int visited = e->comefrom & (1 << hook);
392 if (e->comefrom & (1 << NF_INET_NUMHOOKS))
395 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
397 /* Unconditional return/END. */
398 if ((unconditional(e) &&
399 (strcmp(t->target.u.user.name,
400 XT_STANDARD_TARGET) == 0) &&
401 t->verdict < 0) || visited) {
402 unsigned int oldpos, size;
404 /* Return: backtrack through the last
407 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
409 pos = e->counters.pcnt;
410 e->counters.pcnt = 0;
412 /* We're at the start. */
417 } while (oldpos == pos + e->next_offset);
420 size = e->next_offset;
421 e = entry0 + pos + size;
422 if (pos + size >= newinfo->size)
424 e->counters.pcnt = pos;
427 int newpos = t->verdict;
429 if (strcmp(t->target.u.user.name,
430 XT_STANDARD_TARGET) == 0 &&
432 /* This a jump; chase it. */
433 if (!xt_find_jump_offset(offsets, newpos,
437 /* ... this is a fallthru */
438 newpos = pos + e->next_offset;
439 if (newpos >= newinfo->size)
443 e->counters.pcnt = pos;
452 static void cleanup_match(struct xt_entry_match *m, struct net *net)
454 struct xt_mtdtor_param par;
457 par.match = m->u.kernel.match;
458 par.matchinfo = m->data;
459 par.family = NFPROTO_IPV4;
460 if (par.match->destroy != NULL)
461 par.match->destroy(&par);
462 module_put(par.match->me);
466 check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
468 const struct ipt_ip *ip = par->entryinfo;
470 par->match = m->u.kernel.match;
471 par->matchinfo = m->data;
473 return xt_check_match(par, m->u.match_size - sizeof(*m),
474 ip->proto, ip->invflags & IPT_INV_PROTO);
478 find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
480 struct xt_match *match;
483 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
486 return PTR_ERR(match);
487 m->u.kernel.match = match;
489 ret = check_match(m, par);
495 module_put(m->u.kernel.match->me);
499 static int check_target(struct ipt_entry *e, struct net *net, const char *name)
501 struct xt_entry_target *t = ipt_get_target(e);
502 struct xt_tgchk_param par = {
506 .target = t->u.kernel.target,
508 .hook_mask = e->comefrom,
509 .family = NFPROTO_IPV4,
512 return xt_check_target(&par, t->u.target_size - sizeof(*t),
513 e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
517 find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
519 struct xt_percpu_counter_alloc_state *alloc_state)
521 struct xt_entry_target *t;
522 struct xt_target *target;
525 struct xt_mtchk_param mtpar;
526 struct xt_entry_match *ematch;
528 if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
532 memset(&mtpar, 0, sizeof(mtpar));
535 mtpar.entryinfo = &e->ip;
536 mtpar.hook_mask = e->comefrom;
537 mtpar.family = NFPROTO_IPV4;
538 xt_ematch_foreach(ematch, e) {
539 ret = find_check_match(ematch, &mtpar);
541 goto cleanup_matches;
545 t = ipt_get_target(e);
546 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
548 if (IS_ERR(target)) {
549 ret = PTR_ERR(target);
550 goto cleanup_matches;
552 t->u.kernel.target = target;
554 ret = check_target(e, net, name);
560 module_put(t->u.kernel.target->me);
562 xt_ematch_foreach(ematch, e) {
565 cleanup_match(ematch, net);
568 xt_percpu_counter_free(&e->counters);
573 static bool check_underflow(const struct ipt_entry *e)
575 const struct xt_entry_target *t;
576 unsigned int verdict;
578 if (!unconditional(e))
580 t = ipt_get_target_c(e);
581 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
583 verdict = ((struct xt_standard_target *)t)->verdict;
584 verdict = -verdict - 1;
585 return verdict == NF_DROP || verdict == NF_ACCEPT;
589 check_entry_size_and_hooks(struct ipt_entry *e,
590 struct xt_table_info *newinfo,
591 const unsigned char *base,
592 const unsigned char *limit,
593 const unsigned int *hook_entries,
594 const unsigned int *underflows,
595 unsigned int valid_hooks)
600 if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
601 (unsigned char *)e + sizeof(struct ipt_entry) >= limit ||
602 (unsigned char *)e + e->next_offset > limit)
606 < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target))
609 if (!ip_checkentry(&e->ip))
612 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
617 /* Check hooks & underflows */
618 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
619 if (!(valid_hooks & (1 << h)))
621 if ((unsigned char *)e - base == hook_entries[h])
622 newinfo->hook_entry[h] = hook_entries[h];
623 if ((unsigned char *)e - base == underflows[h]) {
624 if (!check_underflow(e))
627 newinfo->underflow[h] = underflows[h];
631 /* Clear counters and comefrom */
632 e->counters = ((struct xt_counters) { 0, 0 });
638 cleanup_entry(struct ipt_entry *e, struct net *net)
640 struct xt_tgdtor_param par;
641 struct xt_entry_target *t;
642 struct xt_entry_match *ematch;
644 /* Cleanup all matches */
645 xt_ematch_foreach(ematch, e)
646 cleanup_match(ematch, net);
647 t = ipt_get_target(e);
650 par.target = t->u.kernel.target;
651 par.targinfo = t->data;
652 par.family = NFPROTO_IPV4;
653 if (par.target->destroy != NULL)
654 par.target->destroy(&par);
655 module_put(par.target->me);
656 xt_percpu_counter_free(&e->counters);
659 /* Checks and translates the user-supplied table segment (held in
662 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
663 const struct ipt_replace *repl)
665 struct xt_percpu_counter_alloc_state alloc_state = { 0 };
666 struct ipt_entry *iter;
667 unsigned int *offsets;
671 newinfo->size = repl->size;
672 newinfo->number = repl->num_entries;
674 /* Init all hooks to impossible value. */
675 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
676 newinfo->hook_entry[i] = 0xFFFFFFFF;
677 newinfo->underflow[i] = 0xFFFFFFFF;
680 offsets = xt_alloc_entry_offsets(newinfo->number);
684 /* Walk through entries, checking offsets. */
685 xt_entry_foreach(iter, entry0, newinfo->size) {
686 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
693 if (i < repl->num_entries)
694 offsets[i] = (void *)iter - entry0;
696 if (strcmp(ipt_get_target(iter)->u.user.name,
697 XT_ERROR_TARGET) == 0)
698 ++newinfo->stacksize;
702 if (i != repl->num_entries)
705 ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
709 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
715 /* Finally, each sanity check must pass */
717 xt_entry_foreach(iter, entry0, newinfo->size) {
718 ret = find_check_entry(iter, net, repl->name, repl->size,
726 xt_entry_foreach(iter, entry0, newinfo->size) {
729 cleanup_entry(iter, net);
741 get_counters(const struct xt_table_info *t,
742 struct xt_counters counters[])
744 struct ipt_entry *iter;
748 for_each_possible_cpu(cpu) {
749 seqcount_t *s = &per_cpu(xt_recseq, cpu);
752 xt_entry_foreach(iter, t->entries, t->size) {
753 struct xt_counters *tmp;
757 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
759 start = read_seqcount_begin(s);
762 } while (read_seqcount_retry(s, start));
764 ADD_COUNTER(counters[i], bcnt, pcnt);
765 ++i; /* macro does multi eval of i */
771 static void get_old_counters(const struct xt_table_info *t,
772 struct xt_counters counters[])
774 struct ipt_entry *iter;
777 for_each_possible_cpu(cpu) {
779 xt_entry_foreach(iter, t->entries, t->size) {
780 const struct xt_counters *tmp;
782 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
783 ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt);
784 ++i; /* macro does multi eval of i */
791 static struct xt_counters *alloc_counters(const struct xt_table *table)
793 unsigned int countersize;
794 struct xt_counters *counters;
795 const struct xt_table_info *private = table->private;
797 /* We need atomic snapshot of counters: rest doesn't change
798 (other than comefrom, which userspace doesn't care
800 countersize = sizeof(struct xt_counters) * private->number;
801 counters = vzalloc(countersize);
803 if (counters == NULL)
804 return ERR_PTR(-ENOMEM);
806 get_counters(private, counters);
812 copy_entries_to_user(unsigned int total_size,
813 const struct xt_table *table,
814 void __user *userptr)
816 unsigned int off, num;
817 const struct ipt_entry *e;
818 struct xt_counters *counters;
819 const struct xt_table_info *private = table->private;
821 const void *loc_cpu_entry;
823 counters = alloc_counters(table);
824 if (IS_ERR(counters))
825 return PTR_ERR(counters);
827 loc_cpu_entry = private->entries;
829 /* FIXME: use iterator macros --RR */
830 /* ... then go back and fix counters and names */
831 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
833 const struct xt_entry_match *m;
834 const struct xt_entry_target *t;
836 e = loc_cpu_entry + off;
837 if (copy_to_user(userptr + off, e, sizeof(*e))) {
841 if (copy_to_user(userptr + off
842 + offsetof(struct ipt_entry, counters),
844 sizeof(counters[num])) != 0) {
849 for (i = sizeof(struct ipt_entry);
850 i < e->target_offset;
851 i += m->u.match_size) {
854 if (xt_match_to_user(m, userptr + off + i)) {
860 t = ipt_get_target_c(e);
861 if (xt_target_to_user(t, userptr + off + e->target_offset)) {
872 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
873 static void compat_standard_from_user(void *dst, const void *src)
875 int v = *(compat_int_t *)src;
878 v += xt_compat_calc_jump(AF_INET, v);
879 memcpy(dst, &v, sizeof(v));
882 static int compat_standard_to_user(void __user *dst, const void *src)
884 compat_int_t cv = *(int *)src;
887 cv -= xt_compat_calc_jump(AF_INET, cv);
888 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
891 static int compat_calc_entry(const struct ipt_entry *e,
892 const struct xt_table_info *info,
893 const void *base, struct xt_table_info *newinfo)
895 const struct xt_entry_match *ematch;
896 const struct xt_entry_target *t;
897 unsigned int entry_offset;
900 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
901 entry_offset = (void *)e - base;
902 xt_ematch_foreach(ematch, e)
903 off += xt_compat_match_offset(ematch->u.kernel.match);
904 t = ipt_get_target_c(e);
905 off += xt_compat_target_offset(t->u.kernel.target);
906 newinfo->size -= off;
907 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
911 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
912 if (info->hook_entry[i] &&
913 (e < (struct ipt_entry *)(base + info->hook_entry[i])))
914 newinfo->hook_entry[i] -= off;
915 if (info->underflow[i] &&
916 (e < (struct ipt_entry *)(base + info->underflow[i])))
917 newinfo->underflow[i] -= off;
922 static int compat_table_info(const struct xt_table_info *info,
923 struct xt_table_info *newinfo)
925 struct ipt_entry *iter;
926 const void *loc_cpu_entry;
929 if (!newinfo || !info)
932 /* we dont care about newinfo->entries */
933 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
934 newinfo->initial_entries = 0;
935 loc_cpu_entry = info->entries;
936 ret = xt_compat_init_offsets(AF_INET, info->number);
939 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
940 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
948 static int get_info(struct net *net, void __user *user, const int *len)
950 char name[XT_TABLE_MAXNAMELEN];
954 if (*len != sizeof(struct ipt_getinfo))
957 if (copy_from_user(name, user, sizeof(name)) != 0)
960 name[XT_TABLE_MAXNAMELEN-1] = '\0';
961 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
962 if (in_compat_syscall())
963 xt_compat_lock(AF_INET);
965 t = xt_request_find_table_lock(net, AF_INET, name);
967 struct ipt_getinfo info;
968 const struct xt_table_info *private = t->private;
969 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
970 struct xt_table_info tmp;
972 if (in_compat_syscall()) {
973 ret = compat_table_info(private, &tmp);
974 xt_compat_flush_offsets(AF_INET);
978 memset(&info, 0, sizeof(info));
979 info.valid_hooks = t->valid_hooks;
980 memcpy(info.hook_entry, private->hook_entry,
981 sizeof(info.hook_entry));
982 memcpy(info.underflow, private->underflow,
983 sizeof(info.underflow));
984 info.num_entries = private->number;
985 info.size = private->size;
986 strcpy(info.name, name);
988 if (copy_to_user(user, &info, *len) != 0)
997 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
998 if (in_compat_syscall())
999 xt_compat_unlock(AF_INET);
1005 get_entries(struct net *net, struct ipt_get_entries __user *uptr,
1009 struct ipt_get_entries get;
1012 if (*len < sizeof(get))
1014 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1016 if (*len != sizeof(struct ipt_get_entries) + get.size)
1018 get.name[sizeof(get.name) - 1] = '\0';
1020 t = xt_find_table_lock(net, AF_INET, get.name);
1022 const struct xt_table_info *private = t->private;
1023 if (get.size == private->size)
1024 ret = copy_entries_to_user(private->size,
1025 t, uptr->entrytable);
1038 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1039 struct xt_table_info *newinfo, unsigned int num_counters,
1040 void __user *counters_ptr)
1044 struct xt_table_info *oldinfo;
1045 struct xt_counters *counters;
1046 struct ipt_entry *iter;
1048 counters = xt_counters_alloc(num_counters);
1054 t = xt_request_find_table_lock(net, AF_INET, name);
1057 goto free_newinfo_counters_untrans;
1061 if (valid_hooks != t->valid_hooks) {
1066 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1070 /* Update module usage count based on number of rules */
1071 if ((oldinfo->number > oldinfo->initial_entries) ||
1072 (newinfo->number <= oldinfo->initial_entries))
1074 if ((oldinfo->number > oldinfo->initial_entries) &&
1075 (newinfo->number <= oldinfo->initial_entries))
1080 get_old_counters(oldinfo, counters);
1082 /* Decrease module usage counts and free resource */
1083 xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
1084 cleanup_entry(iter, net);
1086 xt_free_table_info(oldinfo);
1087 if (copy_to_user(counters_ptr, counters,
1088 sizeof(struct xt_counters) * num_counters) != 0) {
1089 /* Silent error, can't fail, new table is already in place */
1090 net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n");
1098 free_newinfo_counters_untrans:
1105 do_replace(struct net *net, sockptr_t arg, unsigned int len)
1108 struct ipt_replace tmp;
1109 struct xt_table_info *newinfo;
1110 void *loc_cpu_entry;
1111 struct ipt_entry *iter;
1113 if (len < sizeof(tmp))
1115 if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
1118 /* overflow check */
1119 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1121 if (tmp.num_counters == 0)
1123 if ((u64)len < (u64)tmp.size + sizeof(tmp))
1126 tmp.name[sizeof(tmp.name)-1] = 0;
1128 newinfo = xt_alloc_table_info(tmp.size);
1132 loc_cpu_entry = newinfo->entries;
1133 if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
1139 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1143 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1144 tmp.num_counters, tmp.counters);
1146 goto free_newinfo_untrans;
1149 free_newinfo_untrans:
1150 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1151 cleanup_entry(iter, net);
1153 xt_free_table_info(newinfo);
1158 do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
1161 struct xt_counters_info tmp;
1162 struct xt_counters *paddc;
1164 const struct xt_table_info *private;
1166 struct ipt_entry *iter;
1167 unsigned int addend;
1169 paddc = xt_copy_counters(arg, len, &tmp);
1171 return PTR_ERR(paddc);
1173 t = xt_find_table_lock(net, AF_INET, tmp.name);
1180 private = t->private;
1181 if (private->number != tmp.num_counters) {
1183 goto unlock_up_free;
1187 addend = xt_write_recseq_begin();
1188 xt_entry_foreach(iter, private->entries, private->size) {
1189 struct xt_counters *tmp;
1191 tmp = xt_get_this_cpu_counter(&iter->counters);
1192 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1195 xt_write_recseq_end(addend);
1206 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1207 struct compat_ipt_replace {
1208 char name[XT_TABLE_MAXNAMELEN];
1212 u32 hook_entry[NF_INET_NUMHOOKS];
1213 u32 underflow[NF_INET_NUMHOOKS];
1215 compat_uptr_t counters; /* struct xt_counters * */
1216 struct compat_ipt_entry entries[];
1220 compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
1221 unsigned int *size, struct xt_counters *counters,
1224 struct xt_entry_target *t;
1225 struct compat_ipt_entry __user *ce;
1226 u_int16_t target_offset, next_offset;
1227 compat_uint_t origsize;
1228 const struct xt_entry_match *ematch;
1233 if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 ||
1234 copy_to_user(&ce->counters, &counters[i],
1235 sizeof(counters[i])) != 0)
1238 *dstptr += sizeof(struct compat_ipt_entry);
1239 *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1241 xt_ematch_foreach(ematch, e) {
1242 ret = xt_compat_match_to_user(ematch, dstptr, size);
1246 target_offset = e->target_offset - (origsize - *size);
1247 t = ipt_get_target(e);
1248 ret = xt_compat_target_to_user(t, dstptr, size);
1251 next_offset = e->next_offset - (origsize - *size);
1252 if (put_user(target_offset, &ce->target_offset) != 0 ||
1253 put_user(next_offset, &ce->next_offset) != 0)
1259 compat_find_calc_match(struct xt_entry_match *m,
1260 const struct ipt_ip *ip,
1263 struct xt_match *match;
1265 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
1266 m->u.user.revision);
1268 return PTR_ERR(match);
1270 m->u.kernel.match = match;
1271 *size += xt_compat_match_offset(match);
1275 static void compat_release_entry(struct compat_ipt_entry *e)
1277 struct xt_entry_target *t;
1278 struct xt_entry_match *ematch;
1280 /* Cleanup all matches */
1281 xt_ematch_foreach(ematch, e)
1282 module_put(ematch->u.kernel.match->me);
1283 t = compat_ipt_get_target(e);
1284 module_put(t->u.kernel.target->me);
1288 check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
1289 struct xt_table_info *newinfo,
1291 const unsigned char *base,
1292 const unsigned char *limit)
1294 struct xt_entry_match *ematch;
1295 struct xt_entry_target *t;
1296 struct xt_target *target;
1297 unsigned int entry_offset;
1301 if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 ||
1302 (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit ||
1303 (unsigned char *)e + e->next_offset > limit)
1306 if (e->next_offset < sizeof(struct compat_ipt_entry) +
1307 sizeof(struct compat_xt_entry_target))
1310 if (!ip_checkentry(&e->ip))
1313 ret = xt_compat_check_entry_offsets(e, e->elems,
1314 e->target_offset, e->next_offset);
1318 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1319 entry_offset = (void *)e - (void *)base;
1321 xt_ematch_foreach(ematch, e) {
1322 ret = compat_find_calc_match(ematch, &e->ip, &off);
1324 goto release_matches;
1328 t = compat_ipt_get_target(e);
1329 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
1330 t->u.user.revision);
1331 if (IS_ERR(target)) {
1332 ret = PTR_ERR(target);
1333 goto release_matches;
1335 t->u.kernel.target = target;
1337 off += xt_compat_target_offset(target);
1339 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
1346 module_put(t->u.kernel.target->me);
1348 xt_ematch_foreach(ematch, e) {
1351 module_put(ematch->u.kernel.match->me);
1357 compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
1359 struct xt_table_info *newinfo, unsigned char *base)
1361 struct xt_entry_target *t;
1362 struct ipt_entry *de;
1363 unsigned int origsize;
1365 struct xt_entry_match *ematch;
1369 memcpy(de, e, sizeof(struct ipt_entry));
1370 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1372 *dstptr += sizeof(struct ipt_entry);
1373 *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1375 xt_ematch_foreach(ematch, e)
1376 xt_compat_match_from_user(ematch, dstptr, size);
1378 de->target_offset = e->target_offset - (origsize - *size);
1379 t = compat_ipt_get_target(e);
1380 xt_compat_target_from_user(t, dstptr, size);
1382 de->next_offset = e->next_offset - (origsize - *size);
1384 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1385 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1386 newinfo->hook_entry[h] -= origsize - *size;
1387 if ((unsigned char *)de - base < newinfo->underflow[h])
1388 newinfo->underflow[h] -= origsize - *size;
1393 translate_compat_table(struct net *net,
1394 struct xt_table_info **pinfo,
1396 const struct compat_ipt_replace *compatr)
1399 struct xt_table_info *newinfo, *info;
1400 void *pos, *entry0, *entry1;
1401 struct compat_ipt_entry *iter0;
1402 struct ipt_replace repl;
1408 size = compatr->size;
1409 info->number = compatr->num_entries;
1412 xt_compat_lock(AF_INET);
1413 ret = xt_compat_init_offsets(AF_INET, compatr->num_entries);
1416 /* Walk through entries, checking offsets. */
1417 xt_entry_foreach(iter0, entry0, compatr->size) {
1418 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1420 entry0 + compatr->size);
1427 if (j != compatr->num_entries)
1431 newinfo = xt_alloc_table_info(size);
1435 memset(newinfo->entries, 0, size);
1437 newinfo->number = compatr->num_entries;
1438 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1439 newinfo->hook_entry[i] = compatr->hook_entry[i];
1440 newinfo->underflow[i] = compatr->underflow[i];
1442 entry1 = newinfo->entries;
1444 size = compatr->size;
1445 xt_entry_foreach(iter0, entry0, compatr->size)
1446 compat_copy_entry_from_user(iter0, &pos, &size,
1449 /* all module references in entry0 are now gone.
1450 * entry1/newinfo contains a 64bit ruleset that looks exactly as
1451 * generated by 64bit userspace.
1453 * Call standard translate_table() to validate all hook_entrys,
1454 * underflows, check for loops, etc.
1456 xt_compat_flush_offsets(AF_INET);
1457 xt_compat_unlock(AF_INET);
1459 memcpy(&repl, compatr, sizeof(*compatr));
1461 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1462 repl.hook_entry[i] = newinfo->hook_entry[i];
1463 repl.underflow[i] = newinfo->underflow[i];
1466 repl.num_counters = 0;
1467 repl.counters = NULL;
1468 repl.size = newinfo->size;
1469 ret = translate_table(net, newinfo, entry1, &repl);
1475 xt_free_table_info(info);
1479 xt_free_table_info(newinfo);
1482 xt_compat_flush_offsets(AF_INET);
1483 xt_compat_unlock(AF_INET);
1484 xt_entry_foreach(iter0, entry0, compatr->size) {
1487 compat_release_entry(iter0);
1493 compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
1496 struct compat_ipt_replace tmp;
1497 struct xt_table_info *newinfo;
1498 void *loc_cpu_entry;
1499 struct ipt_entry *iter;
1501 if (len < sizeof(tmp))
1503 if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
1506 /* overflow check */
1507 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1509 if (tmp.num_counters == 0)
1511 if ((u64)len < (u64)tmp.size + sizeof(tmp))
1514 tmp.name[sizeof(tmp.name)-1] = 0;
1516 newinfo = xt_alloc_table_info(tmp.size);
1520 loc_cpu_entry = newinfo->entries;
1521 if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
1527 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1531 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1532 tmp.num_counters, compat_ptr(tmp.counters));
1534 goto free_newinfo_untrans;
1537 free_newinfo_untrans:
1538 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1539 cleanup_entry(iter, net);
1541 xt_free_table_info(newinfo);
1545 struct compat_ipt_get_entries {
1546 char name[XT_TABLE_MAXNAMELEN];
1548 struct compat_ipt_entry entrytable[];
1552 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1553 void __user *userptr)
1555 struct xt_counters *counters;
1556 const struct xt_table_info *private = table->private;
1561 struct ipt_entry *iter;
1563 counters = alloc_counters(table);
1564 if (IS_ERR(counters))
1565 return PTR_ERR(counters);
1569 xt_entry_foreach(iter, private->entries, total_size) {
1570 ret = compat_copy_entry_to_user(iter, &pos,
1571 &size, counters, i++);
1581 compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
1585 struct compat_ipt_get_entries get;
1588 if (*len < sizeof(get))
1591 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1594 if (*len != sizeof(struct compat_ipt_get_entries) + get.size)
1597 get.name[sizeof(get.name) - 1] = '\0';
1599 xt_compat_lock(AF_INET);
1600 t = xt_find_table_lock(net, AF_INET, get.name);
1602 const struct xt_table_info *private = t->private;
1603 struct xt_table_info info;
1604 ret = compat_table_info(private, &info);
1605 if (!ret && get.size == info.size)
1606 ret = compat_copy_entries_to_user(private->size,
1607 t, uptr->entrytable);
1611 xt_compat_flush_offsets(AF_INET);
1617 xt_compat_unlock(AF_INET);
1623 do_ipt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len)
1627 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1631 case IPT_SO_SET_REPLACE:
1632 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1633 if (in_compat_syscall())
1634 ret = compat_do_replace(sock_net(sk), arg, len);
1637 ret = do_replace(sock_net(sk), arg, len);
1640 case IPT_SO_SET_ADD_COUNTERS:
1641 ret = do_add_counters(sock_net(sk), arg, len);
1652 do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1656 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1660 case IPT_SO_GET_INFO:
1661 ret = get_info(sock_net(sk), user, len);
1664 case IPT_SO_GET_ENTRIES:
1665 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1666 if (in_compat_syscall())
1667 ret = compat_get_entries(sock_net(sk), user, len);
1670 ret = get_entries(sock_net(sk), user, len);
1673 case IPT_SO_GET_REVISION_MATCH:
1674 case IPT_SO_GET_REVISION_TARGET: {
1675 struct xt_get_revision rev;
1678 if (*len != sizeof(rev)) {
1682 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1686 rev.name[sizeof(rev.name)-1] = 0;
1688 if (cmd == IPT_SO_GET_REVISION_TARGET)
1693 try_then_request_module(xt_find_revision(AF_INET, rev.name,
1696 "ipt_%s", rev.name);
1707 static void __ipt_unregister_table(struct net *net, struct xt_table *table)
1709 struct xt_table_info *private;
1710 void *loc_cpu_entry;
1711 struct module *table_owner = table->me;
1712 struct ipt_entry *iter;
1714 private = xt_unregister_table(table);
1716 /* Decrease module usage counts and free resources */
1717 loc_cpu_entry = private->entries;
1718 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1719 cleanup_entry(iter, net);
1720 if (private->number > private->initial_entries)
1721 module_put(table_owner);
1722 xt_free_table_info(private);
1725 int ipt_register_table(struct net *net, const struct xt_table *table,
1726 const struct ipt_replace *repl,
1727 const struct nf_hook_ops *template_ops)
1729 struct nf_hook_ops *ops;
1730 unsigned int num_ops;
1732 struct xt_table_info *newinfo;
1733 struct xt_table_info bootstrap = {0};
1734 void *loc_cpu_entry;
1735 struct xt_table *new_table;
1737 newinfo = xt_alloc_table_info(repl->size);
1741 loc_cpu_entry = newinfo->entries;
1742 memcpy(loc_cpu_entry, repl->entries, repl->size);
1744 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1746 xt_free_table_info(newinfo);
1750 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1751 if (IS_ERR(new_table)) {
1752 struct ipt_entry *iter;
1754 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1755 cleanup_entry(iter, net);
1756 xt_free_table_info(newinfo);
1757 return PTR_ERR(new_table);
1760 /* No template? No need to do anything. This is used by 'nat' table, it registers
1761 * with the nat core instead of the netfilter core.
1766 num_ops = hweight32(table->valid_hooks);
1772 ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL);
1778 for (i = 0; i < num_ops; i++)
1779 ops[i].priv = new_table;
1781 new_table->ops = ops;
1783 ret = nf_register_net_hooks(net, ops, num_ops);
1790 __ipt_unregister_table(net, new_table);
1794 void ipt_unregister_table_pre_exit(struct net *net, const char *name)
1796 struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name);
1799 nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks));
1802 void ipt_unregister_table_exit(struct net *net, const char *name)
1804 struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name);
1807 __ipt_unregister_table(net, table);
1810 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
1812 icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
1813 u_int8_t type, u_int8_t code,
1816 return ((test_type == 0xFF) ||
1817 (type == test_type && code >= min_code && code <= max_code))
1822 icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
1824 const struct icmphdr *ic;
1825 struct icmphdr _icmph;
1826 const struct ipt_icmp *icmpinfo = par->matchinfo;
1828 /* Must not be a fragment. */
1829 if (par->fragoff != 0)
1832 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
1834 /* We've been asked to examine this packet, and we
1835 * can't. Hence, no choice but to drop.
1837 par->hotdrop = true;
1841 return icmp_type_code_match(icmpinfo->type,
1845 !!(icmpinfo->invflags&IPT_ICMP_INV));
1848 static int icmp_checkentry(const struct xt_mtchk_param *par)
1850 const struct ipt_icmp *icmpinfo = par->matchinfo;
1852 /* Must specify no unknown invflags */
1853 return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0;
1856 static struct xt_target ipt_builtin_tg[] __read_mostly = {
1858 .name = XT_STANDARD_TARGET,
1859 .targetsize = sizeof(int),
1860 .family = NFPROTO_IPV4,
1861 #ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1862 .compatsize = sizeof(compat_int_t),
1863 .compat_from_user = compat_standard_from_user,
1864 .compat_to_user = compat_standard_to_user,
1868 .name = XT_ERROR_TARGET,
1869 .target = ipt_error,
1870 .targetsize = XT_FUNCTION_MAXNAMELEN,
1871 .family = NFPROTO_IPV4,
1875 static struct nf_sockopt_ops ipt_sockopts = {
1877 .set_optmin = IPT_BASE_CTL,
1878 .set_optmax = IPT_SO_SET_MAX+1,
1879 .set = do_ipt_set_ctl,
1880 .get_optmin = IPT_BASE_CTL,
1881 .get_optmax = IPT_SO_GET_MAX+1,
1882 .get = do_ipt_get_ctl,
1883 .owner = THIS_MODULE,
1886 static struct xt_match ipt_builtin_mt[] __read_mostly = {
1889 .match = icmp_match,
1890 .matchsize = sizeof(struct ipt_icmp),
1891 .checkentry = icmp_checkentry,
1892 .proto = IPPROTO_ICMP,
1893 .family = NFPROTO_IPV4,
1898 static int __net_init ip_tables_net_init(struct net *net)
1900 return xt_proto_init(net, NFPROTO_IPV4);
1903 static void __net_exit ip_tables_net_exit(struct net *net)
1905 xt_proto_fini(net, NFPROTO_IPV4);
1908 static struct pernet_operations ip_tables_net_ops = {
1909 .init = ip_tables_net_init,
1910 .exit = ip_tables_net_exit,
1913 static int __init ip_tables_init(void)
1917 ret = register_pernet_subsys(&ip_tables_net_ops);
1921 /* No one else will be downing sem now, so we won't sleep */
1922 ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
1925 ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
1929 /* Register setsockopt */
1930 ret = nf_register_sockopt(&ipt_sockopts);
1937 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
1939 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
1941 unregister_pernet_subsys(&ip_tables_net_ops);
1946 static void __exit ip_tables_fini(void)
1948 nf_unregister_sockopt(&ipt_sockopts);
1950 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
1951 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
1952 unregister_pernet_subsys(&ip_tables_net_ops);
1955 EXPORT_SYMBOL(ipt_register_table);
1956 EXPORT_SYMBOL(ipt_unregister_table_pre_exit);
1957 EXPORT_SYMBOL(ipt_unregister_table_exit);
1958 EXPORT_SYMBOL(ipt_do_table);
1959 module_init(ip_tables_init);
1960 module_exit(ip_tables_fini);