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 <asm/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 /*#define DEBUG_IP_FIREWALL*/
43 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
44 /*#define DEBUG_IP_FIREWALL_USER*/
46 #ifdef DEBUG_IP_FIREWALL
47 #define dprintf(format, args...) pr_info(format , ## args)
49 #define dprintf(format, args...)
52 #ifdef DEBUG_IP_FIREWALL_USER
53 #define duprintf(format, args...) pr_info(format , ## args)
55 #define duprintf(format, args...)
58 #ifdef CONFIG_NETFILTER_DEBUG
59 #define IP_NF_ASSERT(x) WARN_ON(!(x))
61 #define IP_NF_ASSERT(x)
65 /* All the better to debug you with... */
70 void *ip6t_alloc_initial_table(const struct xt_table *info)
72 return xt_alloc_initial_table(ip6t, IP6T);
74 EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
77 We keep a set of rules for each CPU, so we can avoid write-locking
78 them in the softirq when updating the counters and therefore
79 only need to read-lock in the softirq; doing a write_lock_bh() in user
80 context stops packets coming through and allows user context to read
81 the counters or update the rules.
83 Hence the start of any table is given by get_table() below. */
85 /* Returns whether matches rule or not. */
86 /* Performance critical - called for every packet */
88 ip6_packet_match(const struct sk_buff *skb,
91 const struct ip6t_ip6 *ip6info,
92 unsigned int *protoff,
93 int *fragoff, bool *hotdrop)
96 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
98 #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg)))
100 if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
101 &ip6info->src), IP6T_INV_SRCIP) ||
102 FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
103 &ip6info->dst), IP6T_INV_DSTIP)) {
104 dprintf("Source or dest mismatch.\n");
106 dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
107 ipinfo->smsk.s_addr, ipinfo->src.s_addr,
108 ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
109 dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
110 ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
111 ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
115 ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
117 if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
118 dprintf("VIA in mismatch (%s vs %s).%s\n",
119 indev, ip6info->iniface,
120 ip6info->invflags & IP6T_INV_VIA_IN ? " (INV)" : "");
124 ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
126 if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
127 dprintf("VIA out mismatch (%s vs %s).%s\n",
128 outdev, ip6info->outiface,
129 ip6info->invflags & IP6T_INV_VIA_OUT ? " (INV)" : "");
133 /* ... might want to do something with class and flowlabel here ... */
135 /* look for the desired protocol header */
136 if (ip6info->flags & IP6T_F_PROTO) {
138 unsigned short _frag_off;
140 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off, NULL);
146 *fragoff = _frag_off;
148 dprintf("Packet protocol %hi ?= %s%hi.\n",
150 ip6info->invflags & IP6T_INV_PROTO ? "!":"",
153 if (ip6info->proto == protohdr) {
154 if (ip6info->invflags & IP6T_INV_PROTO)
160 /* We need match for the '-p all', too! */
161 if ((ip6info->proto != 0) &&
162 !(ip6info->invflags & IP6T_INV_PROTO))
168 /* should be ip6 safe */
170 ip6_checkentry(const struct ip6t_ip6 *ipv6)
172 if (ipv6->flags & ~IP6T_F_MASK) {
173 duprintf("Unknown flag bits set: %08X\n",
174 ipv6->flags & ~IP6T_F_MASK);
177 if (ipv6->invflags & ~IP6T_INV_MASK) {
178 duprintf("Unknown invflag bits set: %08X\n",
179 ipv6->invflags & ~IP6T_INV_MASK);
186 ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
188 net_info_ratelimited("error: `%s'\n", (const char *)par->targinfo);
193 static inline struct ip6t_entry *
194 get_entry(const void *base, unsigned int offset)
196 return (struct ip6t_entry *)(base + offset);
199 /* All zeroes == unconditional rule. */
200 /* Mildly perf critical (only if packet tracing is on) */
201 static inline bool unconditional(const struct ip6t_entry *e)
203 static const struct ip6t_ip6 uncond;
205 return e->target_offset == sizeof(struct ip6t_entry) &&
206 memcmp(&e->ipv6, &uncond, sizeof(uncond)) == 0;
209 static inline const struct xt_entry_target *
210 ip6t_get_target_c(const struct ip6t_entry *e)
212 return ip6t_get_target((struct ip6t_entry *)e);
215 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
216 /* This cries for unification! */
217 static const char *const hooknames[] = {
218 [NF_INET_PRE_ROUTING] = "PREROUTING",
219 [NF_INET_LOCAL_IN] = "INPUT",
220 [NF_INET_FORWARD] = "FORWARD",
221 [NF_INET_LOCAL_OUT] = "OUTPUT",
222 [NF_INET_POST_ROUTING] = "POSTROUTING",
225 enum nf_ip_trace_comments {
226 NF_IP6_TRACE_COMMENT_RULE,
227 NF_IP6_TRACE_COMMENT_RETURN,
228 NF_IP6_TRACE_COMMENT_POLICY,
231 static const char *const comments[] = {
232 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
233 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
234 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
237 static struct nf_loginfo trace_loginfo = {
238 .type = NF_LOG_TYPE_LOG,
241 .level = LOGLEVEL_WARNING,
242 .logflags = NF_LOG_MASK,
247 /* Mildly perf critical (only if packet tracing is on) */
249 get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
250 const char *hookname, const char **chainname,
251 const char **comment, unsigned int *rulenum)
253 const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
255 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
256 /* Head of user chain: ERROR target with chainname */
257 *chainname = t->target.data;
262 if (unconditional(s) &&
263 strcmp(t->target.u.kernel.target->name,
264 XT_STANDARD_TARGET) == 0 &&
266 /* Tail of chains: STANDARD target (return/policy) */
267 *comment = *chainname == hookname
268 ? comments[NF_IP6_TRACE_COMMENT_POLICY]
269 : comments[NF_IP6_TRACE_COMMENT_RETURN];
278 static void trace_packet(struct net *net,
279 const struct sk_buff *skb,
281 const struct net_device *in,
282 const struct net_device *out,
283 const char *tablename,
284 const struct xt_table_info *private,
285 const struct ip6t_entry *e)
287 const struct ip6t_entry *root;
288 const char *hookname, *chainname, *comment;
289 const struct ip6t_entry *iter;
290 unsigned int rulenum = 0;
292 root = get_entry(private->entries, private->hook_entry[hook]);
294 hookname = chainname = hooknames[hook];
295 comment = comments[NF_IP6_TRACE_COMMENT_RULE];
297 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
298 if (get_chainname_rulenum(iter, e, hookname,
299 &chainname, &comment, &rulenum) != 0)
302 nf_log_trace(net, AF_INET6, hook, skb, in, out, &trace_loginfo,
303 "TRACE: %s:%s:%s:%u ",
304 tablename, chainname, comment, rulenum);
308 static inline struct ip6t_entry *
309 ip6t_next_entry(const struct ip6t_entry *entry)
311 return (void *)entry + entry->next_offset;
314 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
316 ip6t_do_table(struct sk_buff *skb,
317 const struct nf_hook_state *state,
318 struct xt_table *table)
320 unsigned int hook = state->hook;
321 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
322 /* Initializing verdict to NF_DROP keeps gcc happy. */
323 unsigned int verdict = NF_DROP;
324 const char *indev, *outdev;
325 const void *table_base;
326 struct ip6t_entry *e, **jumpstack;
327 unsigned int stackidx, cpu;
328 const struct xt_table_info *private;
329 struct xt_action_param acpar;
334 indev = state->in ? state->in->name : nulldevname;
335 outdev = state->out ? state->out->name : nulldevname;
336 /* We handle fragments by dealing with the first fragment as
337 * if it was a normal packet. All other fragments are treated
338 * normally, except that they will NEVER match rules that ask
339 * things we don't know, ie. tcp syn flag or ports). If the
340 * rule is also a fragment-specific rule, non-fragments won't
342 acpar.hotdrop = false;
343 acpar.net = state->net;
344 acpar.in = state->in;
345 acpar.out = state->out;
346 acpar.family = NFPROTO_IPV6;
347 acpar.hooknum = hook;
349 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
352 addend = xt_write_recseq_begin();
353 private = table->private;
355 * Ensure we load private-> members after we've fetched the base
358 smp_read_barrier_depends();
359 cpu = smp_processor_id();
360 table_base = private->entries;
361 jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
363 /* Switch to alternate jumpstack if we're being invoked via TEE.
364 * TEE issues XT_CONTINUE verdict on original skb so we must not
365 * clobber the jumpstack.
367 * For recursion via REJECT or SYNPROXY the stack will be clobbered
368 * but it is no problem since absolute verdict is issued by these.
370 if (static_key_false(&xt_tee_enabled))
371 jumpstack += private->stacksize * __this_cpu_read(nf_skb_duplicated);
373 e = get_entry(table_base, private->hook_entry[hook]);
376 const struct xt_entry_target *t;
377 const struct xt_entry_match *ematch;
378 struct xt_counters *counter;
382 if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
383 &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
385 e = ip6t_next_entry(e);
389 xt_ematch_foreach(ematch, e) {
390 acpar.match = ematch->u.kernel.match;
391 acpar.matchinfo = ematch->data;
392 if (!acpar.match->match(skb, &acpar))
396 counter = xt_get_this_cpu_counter(&e->counters);
397 ADD_COUNTER(*counter, skb->len, 1);
399 t = ip6t_get_target_c(e);
400 IP_NF_ASSERT(t->u.kernel.target);
402 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
403 /* The packet is traced: log it */
404 if (unlikely(skb->nf_trace))
405 trace_packet(state->net, skb, hook, state->in,
406 state->out, table->name, private, e);
408 /* Standard target? */
409 if (!t->u.kernel.target->target) {
412 v = ((struct xt_standard_target *)t)->verdict;
414 /* Pop from stack? */
415 if (v != XT_RETURN) {
416 verdict = (unsigned int)(-v) - 1;
420 e = get_entry(table_base,
421 private->underflow[hook]);
423 e = ip6t_next_entry(jumpstack[--stackidx]);
426 if (table_base + v != ip6t_next_entry(e) &&
427 !(e->ipv6.flags & IP6T_F_GOTO)) {
428 jumpstack[stackidx++] = e;
431 e = get_entry(table_base, v);
435 acpar.target = t->u.kernel.target;
436 acpar.targinfo = t->data;
438 verdict = t->u.kernel.target->target(skb, &acpar);
439 if (verdict == XT_CONTINUE)
440 e = ip6t_next_entry(e);
444 } while (!acpar.hotdrop);
446 xt_write_recseq_end(addend);
449 #ifdef DEBUG_ALLOW_ALL
458 static bool find_jump_target(const struct xt_table_info *t,
459 const struct ip6t_entry *target)
461 struct ip6t_entry *iter;
463 xt_entry_foreach(iter, t->entries, t->size) {
470 /* Figures out from what hook each rule can be called: returns 0 if
471 there are loops. Puts hook bitmask in comefrom. */
473 mark_source_chains(const struct xt_table_info *newinfo,
474 unsigned int valid_hooks, void *entry0)
478 /* No recursion; use packet counter to save back ptrs (reset
479 to 0 as we leave), and comefrom to save source hook bitmask */
480 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
481 unsigned int pos = newinfo->hook_entry[hook];
482 struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos);
484 if (!(valid_hooks & (1 << hook)))
487 /* Set initial back pointer. */
488 e->counters.pcnt = pos;
491 const struct xt_standard_target *t
492 = (void *)ip6t_get_target_c(e);
493 int visited = e->comefrom & (1 << hook);
495 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
496 pr_err("iptables: loop hook %u pos %u %08X.\n",
497 hook, pos, e->comefrom);
500 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
502 /* Unconditional return/END. */
503 if ((unconditional(e) &&
504 (strcmp(t->target.u.user.name,
505 XT_STANDARD_TARGET) == 0) &&
506 t->verdict < 0) || visited) {
507 unsigned int oldpos, size;
509 if ((strcmp(t->target.u.user.name,
510 XT_STANDARD_TARGET) == 0) &&
511 t->verdict < -NF_MAX_VERDICT - 1) {
512 duprintf("mark_source_chains: bad "
513 "negative verdict (%i)\n",
518 /* Return: backtrack through the last
521 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
522 #ifdef DEBUG_IP_FIREWALL_USER
524 & (1 << NF_INET_NUMHOOKS)) {
525 duprintf("Back unset "
532 pos = e->counters.pcnt;
533 e->counters.pcnt = 0;
535 /* We're at the start. */
539 e = (struct ip6t_entry *)
541 } while (oldpos == pos + e->next_offset);
544 size = e->next_offset;
545 e = (struct ip6t_entry *)
546 (entry0 + pos + size);
547 if (pos + size >= newinfo->size)
549 e->counters.pcnt = pos;
552 int newpos = t->verdict;
554 if (strcmp(t->target.u.user.name,
555 XT_STANDARD_TARGET) == 0 &&
557 if (newpos > newinfo->size -
558 sizeof(struct ip6t_entry)) {
559 duprintf("mark_source_chains: "
560 "bad verdict (%i)\n",
564 /* This a jump; chase it. */
565 duprintf("Jump rule %u -> %u\n",
567 e = (struct ip6t_entry *)
569 if (!find_jump_target(newinfo, e))
572 /* ... this is a fallthru */
573 newpos = pos + e->next_offset;
574 if (newpos >= newinfo->size)
577 e = (struct ip6t_entry *)
579 e->counters.pcnt = pos;
584 duprintf("Finished chain %u\n", hook);
589 static void cleanup_match(struct xt_entry_match *m, struct net *net)
591 struct xt_mtdtor_param par;
594 par.match = m->u.kernel.match;
595 par.matchinfo = m->data;
596 par.family = NFPROTO_IPV6;
597 if (par.match->destroy != NULL)
598 par.match->destroy(&par);
599 module_put(par.match->me);
602 static int check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
604 const struct ip6t_ip6 *ipv6 = par->entryinfo;
607 par->match = m->u.kernel.match;
608 par->matchinfo = m->data;
610 ret = xt_check_match(par, m->u.match_size - sizeof(*m),
611 ipv6->proto, ipv6->invflags & IP6T_INV_PROTO);
613 duprintf("ip_tables: check failed for `%s'.\n",
621 find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
623 struct xt_match *match;
626 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
629 duprintf("find_check_match: `%s' not found\n", m->u.user.name);
630 return PTR_ERR(match);
632 m->u.kernel.match = match;
634 ret = check_match(m, par);
640 module_put(m->u.kernel.match->me);
644 static int check_target(struct ip6t_entry *e, struct net *net, const char *name)
646 struct xt_entry_target *t = ip6t_get_target(e);
647 struct xt_tgchk_param par = {
651 .target = t->u.kernel.target,
653 .hook_mask = e->comefrom,
654 .family = NFPROTO_IPV6,
658 t = ip6t_get_target(e);
659 ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
660 e->ipv6.proto, e->ipv6.invflags & IP6T_INV_PROTO);
662 duprintf("ip_tables: check failed for `%s'.\n",
663 t->u.kernel.target->name);
670 find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
673 struct xt_entry_target *t;
674 struct xt_target *target;
677 struct xt_mtchk_param mtpar;
678 struct xt_entry_match *ematch;
680 e->counters.pcnt = xt_percpu_counter_alloc();
681 if (IS_ERR_VALUE(e->counters.pcnt))
687 mtpar.entryinfo = &e->ipv6;
688 mtpar.hook_mask = e->comefrom;
689 mtpar.family = NFPROTO_IPV6;
690 xt_ematch_foreach(ematch, e) {
691 ret = find_check_match(ematch, &mtpar);
693 goto cleanup_matches;
697 t = ip6t_get_target(e);
698 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
700 if (IS_ERR(target)) {
701 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
702 ret = PTR_ERR(target);
703 goto cleanup_matches;
705 t->u.kernel.target = target;
707 ret = check_target(e, net, name);
712 module_put(t->u.kernel.target->me);
714 xt_ematch_foreach(ematch, e) {
717 cleanup_match(ematch, net);
720 xt_percpu_counter_free(e->counters.pcnt);
725 static bool check_underflow(const struct ip6t_entry *e)
727 const struct xt_entry_target *t;
728 unsigned int verdict;
730 if (!unconditional(e))
732 t = ip6t_get_target_c(e);
733 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
735 verdict = ((struct xt_standard_target *)t)->verdict;
736 verdict = -verdict - 1;
737 return verdict == NF_DROP || verdict == NF_ACCEPT;
741 check_entry_size_and_hooks(struct ip6t_entry *e,
742 struct xt_table_info *newinfo,
743 const unsigned char *base,
744 const unsigned char *limit,
745 const unsigned int *hook_entries,
746 const unsigned int *underflows,
747 unsigned int valid_hooks)
752 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
753 (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
754 (unsigned char *)e + e->next_offset > limit) {
755 duprintf("Bad offset %p\n", e);
760 < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) {
761 duprintf("checking: element %p size %u\n",
766 if (!ip6_checkentry(&e->ipv6))
769 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
774 /* Check hooks & underflows */
775 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
776 if (!(valid_hooks & (1 << h)))
778 if ((unsigned char *)e - base == hook_entries[h])
779 newinfo->hook_entry[h] = hook_entries[h];
780 if ((unsigned char *)e - base == underflows[h]) {
781 if (!check_underflow(e)) {
782 pr_debug("Underflows must be unconditional and "
783 "use the STANDARD target with "
787 newinfo->underflow[h] = underflows[h];
791 /* Clear counters and comefrom */
792 e->counters = ((struct xt_counters) { 0, 0 });
797 static void cleanup_entry(struct ip6t_entry *e, struct net *net)
799 struct xt_tgdtor_param par;
800 struct xt_entry_target *t;
801 struct xt_entry_match *ematch;
803 /* Cleanup all matches */
804 xt_ematch_foreach(ematch, e)
805 cleanup_match(ematch, net);
806 t = ip6t_get_target(e);
809 par.target = t->u.kernel.target;
810 par.targinfo = t->data;
811 par.family = NFPROTO_IPV6;
812 if (par.target->destroy != NULL)
813 par.target->destroy(&par);
814 module_put(par.target->me);
816 xt_percpu_counter_free(e->counters.pcnt);
819 /* Checks and translates the user-supplied table segment (held in
822 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
823 const struct ip6t_replace *repl)
825 struct ip6t_entry *iter;
829 newinfo->size = repl->size;
830 newinfo->number = repl->num_entries;
832 /* Init all hooks to impossible value. */
833 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
834 newinfo->hook_entry[i] = 0xFFFFFFFF;
835 newinfo->underflow[i] = 0xFFFFFFFF;
838 duprintf("translate_table: size %u\n", newinfo->size);
840 /* Walk through entries, checking offsets. */
841 xt_entry_foreach(iter, entry0, newinfo->size) {
842 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
850 if (strcmp(ip6t_get_target(iter)->u.user.name,
851 XT_ERROR_TARGET) == 0)
852 ++newinfo->stacksize;
855 if (i != repl->num_entries) {
856 duprintf("translate_table: %u not %u entries\n",
857 i, repl->num_entries);
861 /* Check hooks all assigned */
862 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
863 /* Only hooks which are valid */
864 if (!(repl->valid_hooks & (1 << i)))
866 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
867 duprintf("Invalid hook entry %u %u\n",
868 i, repl->hook_entry[i]);
871 if (newinfo->underflow[i] == 0xFFFFFFFF) {
872 duprintf("Invalid underflow %u %u\n",
873 i, repl->underflow[i]);
878 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
881 /* Finally, each sanity check must pass */
883 xt_entry_foreach(iter, entry0, newinfo->size) {
884 ret = find_check_entry(iter, net, repl->name, repl->size);
891 xt_entry_foreach(iter, entry0, newinfo->size) {
894 cleanup_entry(iter, net);
903 get_counters(const struct xt_table_info *t,
904 struct xt_counters counters[])
906 struct ip6t_entry *iter;
910 for_each_possible_cpu(cpu) {
911 seqcount_t *s = &per_cpu(xt_recseq, cpu);
914 xt_entry_foreach(iter, t->entries, t->size) {
915 struct xt_counters *tmp;
919 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
921 start = read_seqcount_begin(s);
924 } while (read_seqcount_retry(s, start));
926 ADD_COUNTER(counters[i], bcnt, pcnt);
932 static struct xt_counters *alloc_counters(const struct xt_table *table)
934 unsigned int countersize;
935 struct xt_counters *counters;
936 const struct xt_table_info *private = table->private;
938 /* We need atomic snapshot of counters: rest doesn't change
939 (other than comefrom, which userspace doesn't care
941 countersize = sizeof(struct xt_counters) * private->number;
942 counters = vzalloc(countersize);
944 if (counters == NULL)
945 return ERR_PTR(-ENOMEM);
947 get_counters(private, counters);
953 copy_entries_to_user(unsigned int total_size,
954 const struct xt_table *table,
955 void __user *userptr)
957 unsigned int off, num;
958 const struct ip6t_entry *e;
959 struct xt_counters *counters;
960 const struct xt_table_info *private = table->private;
962 const void *loc_cpu_entry;
964 counters = alloc_counters(table);
965 if (IS_ERR(counters))
966 return PTR_ERR(counters);
968 loc_cpu_entry = private->entries;
969 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
974 /* FIXME: use iterator macros --RR */
975 /* ... then go back and fix counters and names */
976 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
978 const struct xt_entry_match *m;
979 const struct xt_entry_target *t;
981 e = (struct ip6t_entry *)(loc_cpu_entry + off);
982 if (copy_to_user(userptr + off
983 + offsetof(struct ip6t_entry, counters),
985 sizeof(counters[num])) != 0) {
990 for (i = sizeof(struct ip6t_entry);
991 i < e->target_offset;
992 i += m->u.match_size) {
995 if (copy_to_user(userptr + off + i
996 + offsetof(struct xt_entry_match,
998 m->u.kernel.match->name,
999 strlen(m->u.kernel.match->name)+1)
1006 t = ip6t_get_target_c(e);
1007 if (copy_to_user(userptr + off + e->target_offset
1008 + offsetof(struct xt_entry_target,
1010 t->u.kernel.target->name,
1011 strlen(t->u.kernel.target->name)+1) != 0) {
1022 #ifdef CONFIG_COMPAT
1023 static void compat_standard_from_user(void *dst, const void *src)
1025 int v = *(compat_int_t *)src;
1028 v += xt_compat_calc_jump(AF_INET6, v);
1029 memcpy(dst, &v, sizeof(v));
1032 static int compat_standard_to_user(void __user *dst, const void *src)
1034 compat_int_t cv = *(int *)src;
1037 cv -= xt_compat_calc_jump(AF_INET6, cv);
1038 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
1041 static int compat_calc_entry(const struct ip6t_entry *e,
1042 const struct xt_table_info *info,
1043 const void *base, struct xt_table_info *newinfo)
1045 const struct xt_entry_match *ematch;
1046 const struct xt_entry_target *t;
1047 unsigned int entry_offset;
1050 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1051 entry_offset = (void *)e - base;
1052 xt_ematch_foreach(ematch, e)
1053 off += xt_compat_match_offset(ematch->u.kernel.match);
1054 t = ip6t_get_target_c(e);
1055 off += xt_compat_target_offset(t->u.kernel.target);
1056 newinfo->size -= off;
1057 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1061 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1062 if (info->hook_entry[i] &&
1063 (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
1064 newinfo->hook_entry[i] -= off;
1065 if (info->underflow[i] &&
1066 (e < (struct ip6t_entry *)(base + info->underflow[i])))
1067 newinfo->underflow[i] -= off;
1072 static int compat_table_info(const struct xt_table_info *info,
1073 struct xt_table_info *newinfo)
1075 struct ip6t_entry *iter;
1076 const void *loc_cpu_entry;
1079 if (!newinfo || !info)
1082 /* we dont care about newinfo->entries */
1083 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
1084 newinfo->initial_entries = 0;
1085 loc_cpu_entry = info->entries;
1086 xt_compat_init_offsets(AF_INET6, info->number);
1087 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
1088 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
1096 static int get_info(struct net *net, void __user *user,
1097 const int *len, int compat)
1099 char name[XT_TABLE_MAXNAMELEN];
1103 if (*len != sizeof(struct ip6t_getinfo)) {
1104 duprintf("length %u != %zu\n", *len,
1105 sizeof(struct ip6t_getinfo));
1109 if (copy_from_user(name, user, sizeof(name)) != 0)
1112 name[XT_TABLE_MAXNAMELEN-1] = '\0';
1113 #ifdef CONFIG_COMPAT
1115 xt_compat_lock(AF_INET6);
1117 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1118 "ip6table_%s", name);
1119 if (!IS_ERR_OR_NULL(t)) {
1120 struct ip6t_getinfo info;
1121 const struct xt_table_info *private = t->private;
1122 #ifdef CONFIG_COMPAT
1123 struct xt_table_info tmp;
1126 ret = compat_table_info(private, &tmp);
1127 xt_compat_flush_offsets(AF_INET6);
1131 memset(&info, 0, sizeof(info));
1132 info.valid_hooks = t->valid_hooks;
1133 memcpy(info.hook_entry, private->hook_entry,
1134 sizeof(info.hook_entry));
1135 memcpy(info.underflow, private->underflow,
1136 sizeof(info.underflow));
1137 info.num_entries = private->number;
1138 info.size = private->size;
1139 strcpy(info.name, name);
1141 if (copy_to_user(user, &info, *len) != 0)
1149 ret = t ? PTR_ERR(t) : -ENOENT;
1150 #ifdef CONFIG_COMPAT
1152 xt_compat_unlock(AF_INET6);
1158 get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
1162 struct ip6t_get_entries get;
1165 if (*len < sizeof(get)) {
1166 duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
1169 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1171 if (*len != sizeof(struct ip6t_get_entries) + get.size) {
1172 duprintf("get_entries: %u != %zu\n",
1173 *len, sizeof(get) + get.size);
1177 t = xt_find_table_lock(net, AF_INET6, get.name);
1178 if (!IS_ERR_OR_NULL(t)) {
1179 struct xt_table_info *private = t->private;
1180 duprintf("t->private->number = %u\n", private->number);
1181 if (get.size == private->size)
1182 ret = copy_entries_to_user(private->size,
1183 t, uptr->entrytable);
1185 duprintf("get_entries: I've got %u not %u!\n",
1186 private->size, get.size);
1192 ret = t ? PTR_ERR(t) : -ENOENT;
1198 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1199 struct xt_table_info *newinfo, unsigned int num_counters,
1200 void __user *counters_ptr)
1204 struct xt_table_info *oldinfo;
1205 struct xt_counters *counters;
1206 struct ip6t_entry *iter;
1209 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1215 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1216 "ip6table_%s", name);
1217 if (IS_ERR_OR_NULL(t)) {
1218 ret = t ? PTR_ERR(t) : -ENOENT;
1219 goto free_newinfo_counters_untrans;
1223 if (valid_hooks != t->valid_hooks) {
1224 duprintf("Valid hook crap: %08X vs %08X\n",
1225 valid_hooks, t->valid_hooks);
1230 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1234 /* Update module usage count based on number of rules */
1235 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1236 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1237 if ((oldinfo->number > oldinfo->initial_entries) ||
1238 (newinfo->number <= oldinfo->initial_entries))
1240 if ((oldinfo->number > oldinfo->initial_entries) &&
1241 (newinfo->number <= oldinfo->initial_entries))
1244 /* Get the old counters, and synchronize with replace */
1245 get_counters(oldinfo, counters);
1247 /* Decrease module usage counts and free resource */
1248 xt_entry_foreach(iter, oldinfo->entries, oldinfo->size)
1249 cleanup_entry(iter, net);
1251 xt_free_table_info(oldinfo);
1252 if (copy_to_user(counters_ptr, counters,
1253 sizeof(struct xt_counters) * num_counters) != 0) {
1254 /* Silent error, can't fail, new table is already in place */
1255 net_warn_ratelimited("ip6tables: counters copy to user failed while replacing table\n");
1264 free_newinfo_counters_untrans:
1271 do_replace(struct net *net, const void __user *user, unsigned int len)
1274 struct ip6t_replace tmp;
1275 struct xt_table_info *newinfo;
1276 void *loc_cpu_entry;
1277 struct ip6t_entry *iter;
1279 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1282 /* overflow check */
1283 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1285 if (tmp.num_counters == 0)
1288 tmp.name[sizeof(tmp.name)-1] = 0;
1290 newinfo = xt_alloc_table_info(tmp.size);
1294 loc_cpu_entry = newinfo->entries;
1295 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1301 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1305 duprintf("ip_tables: Translated table\n");
1307 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1308 tmp.num_counters, tmp.counters);
1310 goto free_newinfo_untrans;
1313 free_newinfo_untrans:
1314 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1315 cleanup_entry(iter, net);
1317 xt_free_table_info(newinfo);
1322 do_add_counters(struct net *net, const void __user *user, unsigned int len,
1326 struct xt_counters_info tmp;
1327 struct xt_counters *paddc;
1328 unsigned int num_counters;
1333 const struct xt_table_info *private;
1335 struct ip6t_entry *iter;
1336 unsigned int addend;
1337 #ifdef CONFIG_COMPAT
1338 struct compat_xt_counters_info compat_tmp;
1342 size = sizeof(struct compat_xt_counters_info);
1347 size = sizeof(struct xt_counters_info);
1350 if (copy_from_user(ptmp, user, size) != 0)
1353 #ifdef CONFIG_COMPAT
1355 num_counters = compat_tmp.num_counters;
1356 name = compat_tmp.name;
1360 num_counters = tmp.num_counters;
1364 if (len != size + num_counters * sizeof(struct xt_counters))
1367 paddc = vmalloc(len - size);
1371 if (copy_from_user(paddc, user + size, len - size) != 0) {
1376 t = xt_find_table_lock(net, AF_INET6, name);
1377 if (IS_ERR_OR_NULL(t)) {
1378 ret = t ? PTR_ERR(t) : -ENOENT;
1383 private = t->private;
1384 if (private->number != num_counters) {
1386 goto unlock_up_free;
1390 addend = xt_write_recseq_begin();
1391 xt_entry_foreach(iter, private->entries, private->size) {
1392 struct xt_counters *tmp;
1394 tmp = xt_get_this_cpu_counter(&iter->counters);
1395 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1398 xt_write_recseq_end(addend);
1409 #ifdef CONFIG_COMPAT
1410 struct compat_ip6t_replace {
1411 char name[XT_TABLE_MAXNAMELEN];
1415 u32 hook_entry[NF_INET_NUMHOOKS];
1416 u32 underflow[NF_INET_NUMHOOKS];
1418 compat_uptr_t counters; /* struct xt_counters * */
1419 struct compat_ip6t_entry entries[0];
1423 compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
1424 unsigned int *size, struct xt_counters *counters,
1427 struct xt_entry_target *t;
1428 struct compat_ip6t_entry __user *ce;
1429 u_int16_t target_offset, next_offset;
1430 compat_uint_t origsize;
1431 const struct xt_entry_match *ematch;
1435 ce = (struct compat_ip6t_entry __user *)*dstptr;
1436 if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
1437 copy_to_user(&ce->counters, &counters[i],
1438 sizeof(counters[i])) != 0)
1441 *dstptr += sizeof(struct compat_ip6t_entry);
1442 *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1444 xt_ematch_foreach(ematch, e) {
1445 ret = xt_compat_match_to_user(ematch, dstptr, size);
1449 target_offset = e->target_offset - (origsize - *size);
1450 t = ip6t_get_target(e);
1451 ret = xt_compat_target_to_user(t, dstptr, size);
1454 next_offset = e->next_offset - (origsize - *size);
1455 if (put_user(target_offset, &ce->target_offset) != 0 ||
1456 put_user(next_offset, &ce->next_offset) != 0)
1462 compat_find_calc_match(struct xt_entry_match *m,
1463 const struct ip6t_ip6 *ipv6,
1466 struct xt_match *match;
1468 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
1469 m->u.user.revision);
1470 if (IS_ERR(match)) {
1471 duprintf("compat_check_calc_match: `%s' not found\n",
1473 return PTR_ERR(match);
1475 m->u.kernel.match = match;
1476 *size += xt_compat_match_offset(match);
1480 static void compat_release_entry(struct compat_ip6t_entry *e)
1482 struct xt_entry_target *t;
1483 struct xt_entry_match *ematch;
1485 /* Cleanup all matches */
1486 xt_ematch_foreach(ematch, e)
1487 module_put(ematch->u.kernel.match->me);
1488 t = compat_ip6t_get_target(e);
1489 module_put(t->u.kernel.target->me);
1493 check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
1494 struct xt_table_info *newinfo,
1496 const unsigned char *base,
1497 const unsigned char *limit,
1498 const unsigned int *hook_entries,
1499 const unsigned int *underflows)
1501 struct xt_entry_match *ematch;
1502 struct xt_entry_target *t;
1503 struct xt_target *target;
1504 unsigned int entry_offset;
1508 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1509 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1510 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
1511 (unsigned char *)e + e->next_offset > limit) {
1512 duprintf("Bad offset %p, limit = %p\n", e, limit);
1516 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1517 sizeof(struct compat_xt_entry_target)) {
1518 duprintf("checking: element %p size %u\n",
1523 if (!ip6_checkentry(&e->ipv6))
1526 ret = xt_compat_check_entry_offsets(e, e->elems,
1527 e->target_offset, e->next_offset);
1531 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1532 entry_offset = (void *)e - (void *)base;
1534 xt_ematch_foreach(ematch, e) {
1535 ret = compat_find_calc_match(ematch, &e->ipv6, &off);
1537 goto release_matches;
1541 t = compat_ip6t_get_target(e);
1542 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1543 t->u.user.revision);
1544 if (IS_ERR(target)) {
1545 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1547 ret = PTR_ERR(target);
1548 goto release_matches;
1550 t->u.kernel.target = target;
1552 off += xt_compat_target_offset(target);
1554 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1558 /* Check hooks & underflows */
1559 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1560 if ((unsigned char *)e - base == hook_entries[h])
1561 newinfo->hook_entry[h] = hook_entries[h];
1562 if ((unsigned char *)e - base == underflows[h])
1563 newinfo->underflow[h] = underflows[h];
1566 /* Clear counters and comefrom */
1567 memset(&e->counters, 0, sizeof(e->counters));
1572 module_put(t->u.kernel.target->me);
1574 xt_ematch_foreach(ematch, e) {
1577 module_put(ematch->u.kernel.match->me);
1583 compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1585 struct xt_table_info *newinfo, unsigned char *base)
1587 struct xt_entry_target *t;
1588 struct ip6t_entry *de;
1589 unsigned int origsize;
1591 struct xt_entry_match *ematch;
1594 de = (struct ip6t_entry *)*dstptr;
1595 memcpy(de, e, sizeof(struct ip6t_entry));
1596 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1598 *dstptr += sizeof(struct ip6t_entry);
1599 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1601 xt_ematch_foreach(ematch, e)
1602 xt_compat_match_from_user(ematch, dstptr, size);
1604 de->target_offset = e->target_offset - (origsize - *size);
1605 t = compat_ip6t_get_target(e);
1606 xt_compat_target_from_user(t, dstptr, size);
1608 de->next_offset = e->next_offset - (origsize - *size);
1609 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1610 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1611 newinfo->hook_entry[h] -= origsize - *size;
1612 if ((unsigned char *)de - base < newinfo->underflow[h])
1613 newinfo->underflow[h] -= origsize - *size;
1617 static int compat_check_entry(struct ip6t_entry *e, struct net *net,
1622 struct xt_mtchk_param mtpar;
1623 struct xt_entry_match *ematch;
1625 e->counters.pcnt = xt_percpu_counter_alloc();
1626 if (IS_ERR_VALUE(e->counters.pcnt))
1631 mtpar.entryinfo = &e->ipv6;
1632 mtpar.hook_mask = e->comefrom;
1633 mtpar.family = NFPROTO_IPV6;
1634 xt_ematch_foreach(ematch, e) {
1635 ret = check_match(ematch, &mtpar);
1637 goto cleanup_matches;
1641 ret = check_target(e, net, name);
1643 goto cleanup_matches;
1647 xt_ematch_foreach(ematch, e) {
1650 cleanup_match(ematch, net);
1653 xt_percpu_counter_free(e->counters.pcnt);
1659 translate_compat_table(struct net *net,
1660 struct xt_table_info **pinfo,
1662 const struct compat_ip6t_replace *compatr)
1665 struct xt_table_info *newinfo, *info;
1666 void *pos, *entry0, *entry1;
1667 struct compat_ip6t_entry *iter0;
1668 struct ip6t_entry *iter1;
1674 size = compatr->size;
1675 info->number = compatr->num_entries;
1677 /* Init all hooks to impossible value. */
1678 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1679 info->hook_entry[i] = 0xFFFFFFFF;
1680 info->underflow[i] = 0xFFFFFFFF;
1683 duprintf("translate_compat_table: size %u\n", info->size);
1685 xt_compat_lock(AF_INET6);
1686 xt_compat_init_offsets(AF_INET6, compatr->num_entries);
1687 /* Walk through entries, checking offsets. */
1688 xt_entry_foreach(iter0, entry0, compatr->size) {
1689 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1691 entry0 + compatr->size,
1692 compatr->hook_entry,
1693 compatr->underflow);
1700 if (j != compatr->num_entries) {
1701 duprintf("translate_compat_table: %u not %u entries\n",
1702 j, compatr->num_entries);
1706 /* Check hooks all assigned */
1707 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1708 /* Only hooks which are valid */
1709 if (!(compatr->valid_hooks & (1 << i)))
1711 if (info->hook_entry[i] == 0xFFFFFFFF) {
1712 duprintf("Invalid hook entry %u %u\n",
1713 i, info->hook_entry[i]);
1716 if (info->underflow[i] == 0xFFFFFFFF) {
1717 duprintf("Invalid underflow %u %u\n",
1718 i, info->underflow[i]);
1724 newinfo = xt_alloc_table_info(size);
1728 newinfo->number = compatr->num_entries;
1729 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1730 newinfo->hook_entry[i] = info->hook_entry[i];
1731 newinfo->underflow[i] = info->underflow[i];
1733 entry1 = newinfo->entries;
1735 xt_entry_foreach(iter0, entry0, compatr->size)
1736 compat_copy_entry_from_user(iter0, &pos, &size,
1739 xt_compat_flush_offsets(AF_INET6);
1740 xt_compat_unlock(AF_INET6);
1743 if (!mark_source_chains(newinfo, compatr->valid_hooks, entry1))
1747 xt_entry_foreach(iter1, entry1, newinfo->size) {
1748 ret = compat_check_entry(iter1, net, compatr->name);
1752 if (strcmp(ip6t_get_target(iter1)->u.user.name,
1753 XT_ERROR_TARGET) == 0)
1754 ++newinfo->stacksize;
1758 * The first i matches need cleanup_entry (calls ->destroy)
1759 * because they had called ->check already. The other j-i
1760 * entries need only release.
1764 xt_entry_foreach(iter0, entry0, newinfo->size) {
1769 compat_release_entry(iter0);
1771 xt_entry_foreach(iter1, entry1, newinfo->size) {
1774 cleanup_entry(iter1, net);
1776 xt_free_table_info(newinfo);
1782 xt_free_table_info(info);
1786 xt_free_table_info(newinfo);
1788 xt_entry_foreach(iter0, entry0, compatr->size) {
1791 compat_release_entry(iter0);
1795 xt_compat_flush_offsets(AF_INET6);
1796 xt_compat_unlock(AF_INET6);
1801 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1804 struct compat_ip6t_replace tmp;
1805 struct xt_table_info *newinfo;
1806 void *loc_cpu_entry;
1807 struct ip6t_entry *iter;
1809 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1812 /* overflow check */
1813 if (tmp.size >= INT_MAX / num_possible_cpus())
1815 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1817 if (tmp.num_counters == 0)
1820 tmp.name[sizeof(tmp.name)-1] = 0;
1822 newinfo = xt_alloc_table_info(tmp.size);
1826 loc_cpu_entry = newinfo->entries;
1827 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1833 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1837 duprintf("compat_do_replace: Translated table\n");
1839 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1840 tmp.num_counters, compat_ptr(tmp.counters));
1842 goto free_newinfo_untrans;
1845 free_newinfo_untrans:
1846 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1847 cleanup_entry(iter, net);
1849 xt_free_table_info(newinfo);
1854 compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1859 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1863 case IP6T_SO_SET_REPLACE:
1864 ret = compat_do_replace(sock_net(sk), user, len);
1867 case IP6T_SO_SET_ADD_COUNTERS:
1868 ret = do_add_counters(sock_net(sk), user, len, 1);
1872 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
1879 struct compat_ip6t_get_entries {
1880 char name[XT_TABLE_MAXNAMELEN];
1882 struct compat_ip6t_entry entrytable[0];
1886 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1887 void __user *userptr)
1889 struct xt_counters *counters;
1890 const struct xt_table_info *private = table->private;
1895 struct ip6t_entry *iter;
1897 counters = alloc_counters(table);
1898 if (IS_ERR(counters))
1899 return PTR_ERR(counters);
1903 xt_entry_foreach(iter, private->entries, total_size) {
1904 ret = compat_copy_entry_to_user(iter, &pos,
1905 &size, counters, i++);
1915 compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1919 struct compat_ip6t_get_entries get;
1922 if (*len < sizeof(get)) {
1923 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1927 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1930 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) {
1931 duprintf("compat_get_entries: %u != %zu\n",
1932 *len, sizeof(get) + get.size);
1936 xt_compat_lock(AF_INET6);
1937 t = xt_find_table_lock(net, AF_INET6, get.name);
1938 if (!IS_ERR_OR_NULL(t)) {
1939 const struct xt_table_info *private = t->private;
1940 struct xt_table_info info;
1941 duprintf("t->private->number = %u\n", private->number);
1942 ret = compat_table_info(private, &info);
1943 if (!ret && get.size == info.size) {
1944 ret = compat_copy_entries_to_user(private->size,
1945 t, uptr->entrytable);
1947 duprintf("compat_get_entries: I've got %u not %u!\n",
1948 private->size, get.size);
1951 xt_compat_flush_offsets(AF_INET6);
1955 ret = t ? PTR_ERR(t) : -ENOENT;
1957 xt_compat_unlock(AF_INET6);
1961 static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1964 compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1968 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1972 case IP6T_SO_GET_INFO:
1973 ret = get_info(sock_net(sk), user, len, 1);
1975 case IP6T_SO_GET_ENTRIES:
1976 ret = compat_get_entries(sock_net(sk), user, len);
1979 ret = do_ip6t_get_ctl(sk, cmd, user, len);
1986 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1990 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1994 case IP6T_SO_SET_REPLACE:
1995 ret = do_replace(sock_net(sk), user, len);
1998 case IP6T_SO_SET_ADD_COUNTERS:
1999 ret = do_add_counters(sock_net(sk), user, len, 0);
2003 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
2011 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2015 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2019 case IP6T_SO_GET_INFO:
2020 ret = get_info(sock_net(sk), user, len, 0);
2023 case IP6T_SO_GET_ENTRIES:
2024 ret = get_entries(sock_net(sk), user, len);
2027 case IP6T_SO_GET_REVISION_MATCH:
2028 case IP6T_SO_GET_REVISION_TARGET: {
2029 struct xt_get_revision rev;
2032 if (*len != sizeof(rev)) {
2036 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
2040 rev.name[sizeof(rev.name)-1] = 0;
2042 if (cmd == IP6T_SO_GET_REVISION_TARGET)
2047 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
2050 "ip6t_%s", rev.name);
2055 duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
2062 struct xt_table *ip6t_register_table(struct net *net,
2063 const struct xt_table *table,
2064 const struct ip6t_replace *repl)
2067 struct xt_table_info *newinfo;
2068 struct xt_table_info bootstrap = {0};
2069 void *loc_cpu_entry;
2070 struct xt_table *new_table;
2072 newinfo = xt_alloc_table_info(repl->size);
2078 loc_cpu_entry = newinfo->entries;
2079 memcpy(loc_cpu_entry, repl->entries, repl->size);
2081 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
2085 new_table = xt_register_table(net, table, &bootstrap, newinfo);
2086 if (IS_ERR(new_table)) {
2087 ret = PTR_ERR(new_table);
2093 xt_free_table_info(newinfo);
2095 return ERR_PTR(ret);
2098 void ip6t_unregister_table(struct net *net, struct xt_table *table)
2100 struct xt_table_info *private;
2101 void *loc_cpu_entry;
2102 struct module *table_owner = table->me;
2103 struct ip6t_entry *iter;
2105 private = xt_unregister_table(table);
2107 /* Decrease module usage counts and free resources */
2108 loc_cpu_entry = private->entries;
2109 xt_entry_foreach(iter, loc_cpu_entry, private->size)
2110 cleanup_entry(iter, net);
2111 if (private->number > private->initial_entries)
2112 module_put(table_owner);
2113 xt_free_table_info(private);
2116 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2118 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2119 u_int8_t type, u_int8_t code,
2122 return (type == test_type && code >= min_code && code <= max_code)
2127 icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
2129 const struct icmp6hdr *ic;
2130 struct icmp6hdr _icmph;
2131 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2133 /* Must not be a fragment. */
2134 if (par->fragoff != 0)
2137 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
2139 /* We've been asked to examine this packet, and we
2140 * can't. Hence, no choice but to drop.
2142 duprintf("Dropping evil ICMP tinygram.\n");
2143 par->hotdrop = true;
2147 return icmp6_type_code_match(icmpinfo->type,
2150 ic->icmp6_type, ic->icmp6_code,
2151 !!(icmpinfo->invflags&IP6T_ICMP_INV));
2154 /* Called when user tries to insert an entry of this type. */
2155 static int icmp6_checkentry(const struct xt_mtchk_param *par)
2157 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2159 /* Must specify no unknown invflags */
2160 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
2163 /* The built-in targets: standard (NULL) and error. */
2164 static struct xt_target ip6t_builtin_tg[] __read_mostly = {
2166 .name = XT_STANDARD_TARGET,
2167 .targetsize = sizeof(int),
2168 .family = NFPROTO_IPV6,
2169 #ifdef CONFIG_COMPAT
2170 .compatsize = sizeof(compat_int_t),
2171 .compat_from_user = compat_standard_from_user,
2172 .compat_to_user = compat_standard_to_user,
2176 .name = XT_ERROR_TARGET,
2177 .target = ip6t_error,
2178 .targetsize = XT_FUNCTION_MAXNAMELEN,
2179 .family = NFPROTO_IPV6,
2183 static struct nf_sockopt_ops ip6t_sockopts = {
2185 .set_optmin = IP6T_BASE_CTL,
2186 .set_optmax = IP6T_SO_SET_MAX+1,
2187 .set = do_ip6t_set_ctl,
2188 #ifdef CONFIG_COMPAT
2189 .compat_set = compat_do_ip6t_set_ctl,
2191 .get_optmin = IP6T_BASE_CTL,
2192 .get_optmax = IP6T_SO_GET_MAX+1,
2193 .get = do_ip6t_get_ctl,
2194 #ifdef CONFIG_COMPAT
2195 .compat_get = compat_do_ip6t_get_ctl,
2197 .owner = THIS_MODULE,
2200 static struct xt_match ip6t_builtin_mt[] __read_mostly = {
2203 .match = icmp6_match,
2204 .matchsize = sizeof(struct ip6t_icmp),
2205 .checkentry = icmp6_checkentry,
2206 .proto = IPPROTO_ICMPV6,
2207 .family = NFPROTO_IPV6,
2211 static int __net_init ip6_tables_net_init(struct net *net)
2213 return xt_proto_init(net, NFPROTO_IPV6);
2216 static void __net_exit ip6_tables_net_exit(struct net *net)
2218 xt_proto_fini(net, NFPROTO_IPV6);
2221 static struct pernet_operations ip6_tables_net_ops = {
2222 .init = ip6_tables_net_init,
2223 .exit = ip6_tables_net_exit,
2226 static int __init ip6_tables_init(void)
2230 ret = register_pernet_subsys(&ip6_tables_net_ops);
2234 /* No one else will be downing sem now, so we won't sleep */
2235 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2238 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2242 /* Register setsockopt */
2243 ret = nf_register_sockopt(&ip6t_sockopts);
2247 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2251 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2253 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2255 unregister_pernet_subsys(&ip6_tables_net_ops);
2260 static void __exit ip6_tables_fini(void)
2262 nf_unregister_sockopt(&ip6t_sockopts);
2264 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2265 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2266 unregister_pernet_subsys(&ip6_tables_net_ops);
2269 EXPORT_SYMBOL(ip6t_register_table);
2270 EXPORT_SYMBOL(ip6t_unregister_table);
2271 EXPORT_SYMBOL(ip6t_do_table);
2273 module_init(ip6_tables_init);
2274 module_exit(ip6_tables_fini);