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)
1499 struct xt_entry_match *ematch;
1500 struct xt_entry_target *t;
1501 struct xt_target *target;
1502 unsigned int entry_offset;
1506 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1507 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1508 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
1509 (unsigned char *)e + e->next_offset > limit) {
1510 duprintf("Bad offset %p, limit = %p\n", e, limit);
1514 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1515 sizeof(struct compat_xt_entry_target)) {
1516 duprintf("checking: element %p size %u\n",
1521 if (!ip6_checkentry(&e->ipv6))
1524 ret = xt_compat_check_entry_offsets(e, e->elems,
1525 e->target_offset, e->next_offset);
1529 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1530 entry_offset = (void *)e - (void *)base;
1532 xt_ematch_foreach(ematch, e) {
1533 ret = compat_find_calc_match(ematch, &e->ipv6, &off);
1535 goto release_matches;
1539 t = compat_ip6t_get_target(e);
1540 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1541 t->u.user.revision);
1542 if (IS_ERR(target)) {
1543 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1545 ret = PTR_ERR(target);
1546 goto release_matches;
1548 t->u.kernel.target = target;
1550 off += xt_compat_target_offset(target);
1552 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1559 module_put(t->u.kernel.target->me);
1561 xt_ematch_foreach(ematch, e) {
1564 module_put(ematch->u.kernel.match->me);
1570 compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1572 struct xt_table_info *newinfo, unsigned char *base)
1574 struct xt_entry_target *t;
1575 struct ip6t_entry *de;
1576 unsigned int origsize;
1578 struct xt_entry_match *ematch;
1581 de = (struct ip6t_entry *)*dstptr;
1582 memcpy(de, e, sizeof(struct ip6t_entry));
1583 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1585 *dstptr += sizeof(struct ip6t_entry);
1586 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1588 xt_ematch_foreach(ematch, e)
1589 xt_compat_match_from_user(ematch, dstptr, size);
1591 de->target_offset = e->target_offset - (origsize - *size);
1592 t = compat_ip6t_get_target(e);
1593 xt_compat_target_from_user(t, dstptr, size);
1595 de->next_offset = e->next_offset - (origsize - *size);
1596 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1597 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1598 newinfo->hook_entry[h] -= origsize - *size;
1599 if ((unsigned char *)de - base < newinfo->underflow[h])
1600 newinfo->underflow[h] -= origsize - *size;
1605 translate_compat_table(struct net *net,
1606 struct xt_table_info **pinfo,
1608 const struct compat_ip6t_replace *compatr)
1611 struct xt_table_info *newinfo, *info;
1612 void *pos, *entry0, *entry1;
1613 struct compat_ip6t_entry *iter0;
1614 struct ip6t_replace repl;
1620 size = compatr->size;
1621 info->number = compatr->num_entries;
1623 duprintf("translate_compat_table: size %u\n", info->size);
1625 xt_compat_lock(AF_INET6);
1626 xt_compat_init_offsets(AF_INET6, compatr->num_entries);
1627 /* Walk through entries, checking offsets. */
1628 xt_entry_foreach(iter0, entry0, compatr->size) {
1629 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1631 entry0 + compatr->size);
1638 if (j != compatr->num_entries) {
1639 duprintf("translate_compat_table: %u not %u entries\n",
1640 j, compatr->num_entries);
1645 newinfo = xt_alloc_table_info(size);
1649 newinfo->number = compatr->num_entries;
1650 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1651 newinfo->hook_entry[i] = compatr->hook_entry[i];
1652 newinfo->underflow[i] = compatr->underflow[i];
1654 entry1 = newinfo->entries;
1656 size = compatr->size;
1657 xt_entry_foreach(iter0, entry0, compatr->size)
1658 compat_copy_entry_from_user(iter0, &pos, &size,
1661 /* all module references in entry0 are now gone. */
1662 xt_compat_flush_offsets(AF_INET6);
1663 xt_compat_unlock(AF_INET6);
1665 memcpy(&repl, compatr, sizeof(*compatr));
1667 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1668 repl.hook_entry[i] = newinfo->hook_entry[i];
1669 repl.underflow[i] = newinfo->underflow[i];
1672 repl.num_counters = 0;
1673 repl.counters = NULL;
1674 repl.size = newinfo->size;
1675 ret = translate_table(net, newinfo, entry1, &repl);
1681 xt_free_table_info(info);
1685 xt_free_table_info(newinfo);
1688 xt_compat_flush_offsets(AF_INET6);
1689 xt_compat_unlock(AF_INET6);
1690 xt_entry_foreach(iter0, entry0, compatr->size) {
1693 compat_release_entry(iter0);
1699 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1702 struct compat_ip6t_replace tmp;
1703 struct xt_table_info *newinfo;
1704 void *loc_cpu_entry;
1705 struct ip6t_entry *iter;
1707 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1710 /* overflow check */
1711 if (tmp.size >= INT_MAX / num_possible_cpus())
1713 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1715 if (tmp.num_counters == 0)
1718 tmp.name[sizeof(tmp.name)-1] = 0;
1720 newinfo = xt_alloc_table_info(tmp.size);
1724 loc_cpu_entry = newinfo->entries;
1725 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1731 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1735 duprintf("compat_do_replace: Translated table\n");
1737 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1738 tmp.num_counters, compat_ptr(tmp.counters));
1740 goto free_newinfo_untrans;
1743 free_newinfo_untrans:
1744 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1745 cleanup_entry(iter, net);
1747 xt_free_table_info(newinfo);
1752 compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1757 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1761 case IP6T_SO_SET_REPLACE:
1762 ret = compat_do_replace(sock_net(sk), user, len);
1765 case IP6T_SO_SET_ADD_COUNTERS:
1766 ret = do_add_counters(sock_net(sk), user, len, 1);
1770 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
1777 struct compat_ip6t_get_entries {
1778 char name[XT_TABLE_MAXNAMELEN];
1780 struct compat_ip6t_entry entrytable[0];
1784 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1785 void __user *userptr)
1787 struct xt_counters *counters;
1788 const struct xt_table_info *private = table->private;
1793 struct ip6t_entry *iter;
1795 counters = alloc_counters(table);
1796 if (IS_ERR(counters))
1797 return PTR_ERR(counters);
1801 xt_entry_foreach(iter, private->entries, total_size) {
1802 ret = compat_copy_entry_to_user(iter, &pos,
1803 &size, counters, i++);
1813 compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1817 struct compat_ip6t_get_entries get;
1820 if (*len < sizeof(get)) {
1821 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1825 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1828 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) {
1829 duprintf("compat_get_entries: %u != %zu\n",
1830 *len, sizeof(get) + get.size);
1834 xt_compat_lock(AF_INET6);
1835 t = xt_find_table_lock(net, AF_INET6, get.name);
1836 if (!IS_ERR_OR_NULL(t)) {
1837 const struct xt_table_info *private = t->private;
1838 struct xt_table_info info;
1839 duprintf("t->private->number = %u\n", private->number);
1840 ret = compat_table_info(private, &info);
1841 if (!ret && get.size == info.size) {
1842 ret = compat_copy_entries_to_user(private->size,
1843 t, uptr->entrytable);
1845 duprintf("compat_get_entries: I've got %u not %u!\n",
1846 private->size, get.size);
1849 xt_compat_flush_offsets(AF_INET6);
1853 ret = t ? PTR_ERR(t) : -ENOENT;
1855 xt_compat_unlock(AF_INET6);
1859 static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1862 compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1866 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1870 case IP6T_SO_GET_INFO:
1871 ret = get_info(sock_net(sk), user, len, 1);
1873 case IP6T_SO_GET_ENTRIES:
1874 ret = compat_get_entries(sock_net(sk), user, len);
1877 ret = do_ip6t_get_ctl(sk, cmd, user, len);
1884 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1888 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1892 case IP6T_SO_SET_REPLACE:
1893 ret = do_replace(sock_net(sk), user, len);
1896 case IP6T_SO_SET_ADD_COUNTERS:
1897 ret = do_add_counters(sock_net(sk), user, len, 0);
1901 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
1909 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1913 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1917 case IP6T_SO_GET_INFO:
1918 ret = get_info(sock_net(sk), user, len, 0);
1921 case IP6T_SO_GET_ENTRIES:
1922 ret = get_entries(sock_net(sk), user, len);
1925 case IP6T_SO_GET_REVISION_MATCH:
1926 case IP6T_SO_GET_REVISION_TARGET: {
1927 struct xt_get_revision rev;
1930 if (*len != sizeof(rev)) {
1934 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1938 rev.name[sizeof(rev.name)-1] = 0;
1940 if (cmd == IP6T_SO_GET_REVISION_TARGET)
1945 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
1948 "ip6t_%s", rev.name);
1953 duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
1960 struct xt_table *ip6t_register_table(struct net *net,
1961 const struct xt_table *table,
1962 const struct ip6t_replace *repl)
1965 struct xt_table_info *newinfo;
1966 struct xt_table_info bootstrap = {0};
1967 void *loc_cpu_entry;
1968 struct xt_table *new_table;
1970 newinfo = xt_alloc_table_info(repl->size);
1976 loc_cpu_entry = newinfo->entries;
1977 memcpy(loc_cpu_entry, repl->entries, repl->size);
1979 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1983 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1984 if (IS_ERR(new_table)) {
1985 ret = PTR_ERR(new_table);
1991 xt_free_table_info(newinfo);
1993 return ERR_PTR(ret);
1996 void ip6t_unregister_table(struct net *net, struct xt_table *table)
1998 struct xt_table_info *private;
1999 void *loc_cpu_entry;
2000 struct module *table_owner = table->me;
2001 struct ip6t_entry *iter;
2003 private = xt_unregister_table(table);
2005 /* Decrease module usage counts and free resources */
2006 loc_cpu_entry = private->entries;
2007 xt_entry_foreach(iter, loc_cpu_entry, private->size)
2008 cleanup_entry(iter, net);
2009 if (private->number > private->initial_entries)
2010 module_put(table_owner);
2011 xt_free_table_info(private);
2014 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2016 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2017 u_int8_t type, u_int8_t code,
2020 return (type == test_type && code >= min_code && code <= max_code)
2025 icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
2027 const struct icmp6hdr *ic;
2028 struct icmp6hdr _icmph;
2029 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2031 /* Must not be a fragment. */
2032 if (par->fragoff != 0)
2035 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
2037 /* We've been asked to examine this packet, and we
2038 * can't. Hence, no choice but to drop.
2040 duprintf("Dropping evil ICMP tinygram.\n");
2041 par->hotdrop = true;
2045 return icmp6_type_code_match(icmpinfo->type,
2048 ic->icmp6_type, ic->icmp6_code,
2049 !!(icmpinfo->invflags&IP6T_ICMP_INV));
2052 /* Called when user tries to insert an entry of this type. */
2053 static int icmp6_checkentry(const struct xt_mtchk_param *par)
2055 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2057 /* Must specify no unknown invflags */
2058 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
2061 /* The built-in targets: standard (NULL) and error. */
2062 static struct xt_target ip6t_builtin_tg[] __read_mostly = {
2064 .name = XT_STANDARD_TARGET,
2065 .targetsize = sizeof(int),
2066 .family = NFPROTO_IPV6,
2067 #ifdef CONFIG_COMPAT
2068 .compatsize = sizeof(compat_int_t),
2069 .compat_from_user = compat_standard_from_user,
2070 .compat_to_user = compat_standard_to_user,
2074 .name = XT_ERROR_TARGET,
2075 .target = ip6t_error,
2076 .targetsize = XT_FUNCTION_MAXNAMELEN,
2077 .family = NFPROTO_IPV6,
2081 static struct nf_sockopt_ops ip6t_sockopts = {
2083 .set_optmin = IP6T_BASE_CTL,
2084 .set_optmax = IP6T_SO_SET_MAX+1,
2085 .set = do_ip6t_set_ctl,
2086 #ifdef CONFIG_COMPAT
2087 .compat_set = compat_do_ip6t_set_ctl,
2089 .get_optmin = IP6T_BASE_CTL,
2090 .get_optmax = IP6T_SO_GET_MAX+1,
2091 .get = do_ip6t_get_ctl,
2092 #ifdef CONFIG_COMPAT
2093 .compat_get = compat_do_ip6t_get_ctl,
2095 .owner = THIS_MODULE,
2098 static struct xt_match ip6t_builtin_mt[] __read_mostly = {
2101 .match = icmp6_match,
2102 .matchsize = sizeof(struct ip6t_icmp),
2103 .checkentry = icmp6_checkentry,
2104 .proto = IPPROTO_ICMPV6,
2105 .family = NFPROTO_IPV6,
2109 static int __net_init ip6_tables_net_init(struct net *net)
2111 return xt_proto_init(net, NFPROTO_IPV6);
2114 static void __net_exit ip6_tables_net_exit(struct net *net)
2116 xt_proto_fini(net, NFPROTO_IPV6);
2119 static struct pernet_operations ip6_tables_net_ops = {
2120 .init = ip6_tables_net_init,
2121 .exit = ip6_tables_net_exit,
2124 static int __init ip6_tables_init(void)
2128 ret = register_pernet_subsys(&ip6_tables_net_ops);
2132 /* No one else will be downing sem now, so we won't sleep */
2133 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2136 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2140 /* Register setsockopt */
2141 ret = nf_register_sockopt(&ip6t_sockopts);
2145 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2149 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2151 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2153 unregister_pernet_subsys(&ip6_tables_net_ops);
2158 static void __exit ip6_tables_fini(void)
2160 nf_unregister_sockopt(&ip6t_sockopts);
2162 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2163 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2164 unregister_pernet_subsys(&ip6_tables_net_ops);
2167 EXPORT_SYMBOL(ip6t_register_table);
2168 EXPORT_SYMBOL(ip6t_unregister_table);
2169 EXPORT_SYMBOL(ip6t_do_table);
2171 module_init(ip6_tables_init);
2172 module_exit(ip6_tables_fini);