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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/capability.h>
14 #include <linux/skbuff.h>
15 #include <linux/kmod.h>
16 #include <linux/vmalloc.h>
17 #include <linux/netdevice.h>
18 #include <linux/module.h>
19 #include <linux/poison.h>
20 #include <linux/icmpv6.h>
22 #include <net/compat.h>
23 #include <asm/uaccess.h>
24 #include <linux/mutex.h>
25 #include <linux/proc_fs.h>
26 #include <linux/err.h>
27 #include <linux/cpumask.h>
29 #include <linux/netfilter_ipv6/ip6_tables.h>
30 #include <linux/netfilter/x_tables.h>
31 #include <net/netfilter/nf_log.h>
32 #include "../../netfilter/xt_repldata.h"
34 MODULE_LICENSE("GPL");
35 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
36 MODULE_DESCRIPTION("IPv6 packet filter");
38 /*#define DEBUG_IP_FIREWALL*/
39 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
40 /*#define DEBUG_IP_FIREWALL_USER*/
42 #ifdef DEBUG_IP_FIREWALL
43 #define dprintf(format, args...) pr_info(format , ## args)
45 #define dprintf(format, args...)
48 #ifdef DEBUG_IP_FIREWALL_USER
49 #define duprintf(format, args...) pr_info(format , ## args)
51 #define duprintf(format, args...)
54 #ifdef CONFIG_NETFILTER_DEBUG
55 #define IP_NF_ASSERT(x) WARN_ON(!(x))
57 #define IP_NF_ASSERT(x)
61 /* All the better to debug you with... */
66 void *ip6t_alloc_initial_table(const struct xt_table *info)
68 return xt_alloc_initial_table(ip6t, IP6T);
70 EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
73 We keep a set of rules for each CPU, so we can avoid write-locking
74 them in the softirq when updating the counters and therefore
75 only need to read-lock in the softirq; doing a write_lock_bh() in user
76 context stops packets coming through and allows user context to read
77 the counters or update the rules.
79 Hence the start of any table is given by get_table() below. */
81 /* Check for an extension */
83 ip6t_ext_hdr(u8 nexthdr)
85 return (nexthdr == IPPROTO_HOPOPTS) ||
86 (nexthdr == IPPROTO_ROUTING) ||
87 (nexthdr == IPPROTO_FRAGMENT) ||
88 (nexthdr == IPPROTO_ESP) ||
89 (nexthdr == IPPROTO_AH) ||
90 (nexthdr == IPPROTO_NONE) ||
91 (nexthdr == IPPROTO_DSTOPTS);
94 /* Returns whether matches rule or not. */
95 /* Performance critical - called for every packet */
97 ip6_packet_match(const struct sk_buff *skb,
100 const struct ip6t_ip6 *ip6info,
101 unsigned int *protoff,
102 int *fragoff, bool *hotdrop)
105 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
107 #define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg)))
109 if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
110 &ip6info->src), IP6T_INV_SRCIP) ||
111 FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
112 &ip6info->dst), IP6T_INV_DSTIP)) {
113 dprintf("Source or dest mismatch.\n");
115 dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
116 ipinfo->smsk.s_addr, ipinfo->src.s_addr,
117 ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
118 dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
119 ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
120 ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
124 ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
126 if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
127 dprintf("VIA in mismatch (%s vs %s).%s\n",
128 indev, ip6info->iniface,
129 ip6info->invflags&IP6T_INV_VIA_IN ?" (INV)":"");
133 ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
135 if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
136 dprintf("VIA out mismatch (%s vs %s).%s\n",
137 outdev, ip6info->outiface,
138 ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":"");
142 /* ... might want to do something with class and flowlabel here ... */
144 /* look for the desired protocol header */
145 if((ip6info->flags & IP6T_F_PROTO)) {
147 unsigned short _frag_off;
149 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off);
155 *fragoff = _frag_off;
157 dprintf("Packet protocol %hi ?= %s%hi.\n",
159 ip6info->invflags & IP6T_INV_PROTO ? "!":"",
162 if (ip6info->proto == protohdr) {
163 if(ip6info->invflags & IP6T_INV_PROTO) {
169 /* We need match for the '-p all', too! */
170 if ((ip6info->proto != 0) &&
171 !(ip6info->invflags & IP6T_INV_PROTO))
177 /* should be ip6 safe */
179 ip6_checkentry(const struct ip6t_ip6 *ipv6)
181 if (ipv6->flags & ~IP6T_F_MASK) {
182 duprintf("Unknown flag bits set: %08X\n",
183 ipv6->flags & ~IP6T_F_MASK);
186 if (ipv6->invflags & ~IP6T_INV_MASK) {
187 duprintf("Unknown invflag bits set: %08X\n",
188 ipv6->invflags & ~IP6T_INV_MASK);
195 ip6t_error(struct sk_buff *skb, const struct xt_action_param *par)
198 pr_info("error: `%s'\n", (const char *)par->targinfo);
203 static inline struct ip6t_entry *
204 get_entry(const void *base, unsigned int offset)
206 return (struct ip6t_entry *)(base + offset);
209 /* All zeroes == unconditional rule. */
210 /* Mildly perf critical (only if packet tracing is on) */
211 static inline bool unconditional(const struct ip6t_ip6 *ipv6)
213 static const struct ip6t_ip6 uncond;
215 return memcmp(ipv6, &uncond, sizeof(uncond)) == 0;
218 static inline const struct xt_entry_target *
219 ip6t_get_target_c(const struct ip6t_entry *e)
221 return ip6t_get_target((struct ip6t_entry *)e);
224 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
225 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
226 /* This cries for unification! */
227 static const char *const hooknames[] = {
228 [NF_INET_PRE_ROUTING] = "PREROUTING",
229 [NF_INET_LOCAL_IN] = "INPUT",
230 [NF_INET_FORWARD] = "FORWARD",
231 [NF_INET_LOCAL_OUT] = "OUTPUT",
232 [NF_INET_POST_ROUTING] = "POSTROUTING",
235 enum nf_ip_trace_comments {
236 NF_IP6_TRACE_COMMENT_RULE,
237 NF_IP6_TRACE_COMMENT_RETURN,
238 NF_IP6_TRACE_COMMENT_POLICY,
241 static const char *const comments[] = {
242 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
243 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
244 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
247 static struct nf_loginfo trace_loginfo = {
248 .type = NF_LOG_TYPE_LOG,
252 .logflags = NF_LOG_MASK,
257 /* Mildly perf critical (only if packet tracing is on) */
259 get_chainname_rulenum(const struct ip6t_entry *s, const struct ip6t_entry *e,
260 const char *hookname, const char **chainname,
261 const char **comment, unsigned int *rulenum)
263 const struct xt_standard_target *t = (void *)ip6t_get_target_c(s);
265 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
266 /* Head of user chain: ERROR target with chainname */
267 *chainname = t->target.data;
272 if (s->target_offset == sizeof(struct ip6t_entry) &&
273 strcmp(t->target.u.kernel.target->name,
274 XT_STANDARD_TARGET) == 0 &&
276 unconditional(&s->ipv6)) {
277 /* Tail of chains: STANDARD target (return/policy) */
278 *comment = *chainname == hookname
279 ? comments[NF_IP6_TRACE_COMMENT_POLICY]
280 : comments[NF_IP6_TRACE_COMMENT_RETURN];
289 static void trace_packet(const struct sk_buff *skb,
291 const struct net_device *in,
292 const struct net_device *out,
293 const char *tablename,
294 const struct xt_table_info *private,
295 const struct ip6t_entry *e)
297 const void *table_base;
298 const struct ip6t_entry *root;
299 const char *hookname, *chainname, *comment;
300 const struct ip6t_entry *iter;
301 unsigned int rulenum = 0;
303 table_base = private->entries[smp_processor_id()];
304 root = get_entry(table_base, private->hook_entry[hook]);
306 hookname = chainname = hooknames[hook];
307 comment = comments[NF_IP6_TRACE_COMMENT_RULE];
309 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
310 if (get_chainname_rulenum(iter, e, hookname,
311 &chainname, &comment, &rulenum) != 0)
314 nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo,
315 "TRACE: %s:%s:%s:%u ",
316 tablename, chainname, comment, rulenum);
320 static inline __pure struct ip6t_entry *
321 ip6t_next_entry(const struct ip6t_entry *entry)
323 return (void *)entry + entry->next_offset;
326 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
328 ip6t_do_table(struct sk_buff *skb,
330 const struct net_device *in,
331 const struct net_device *out,
332 struct xt_table *table)
334 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
335 /* Initializing verdict to NF_DROP keeps gcc happy. */
336 unsigned int verdict = NF_DROP;
337 const char *indev, *outdev;
338 const void *table_base;
339 struct ip6t_entry *e, **jumpstack;
340 unsigned int *stackptr, origptr, cpu;
341 const struct xt_table_info *private;
342 struct xt_action_param acpar;
345 indev = in ? in->name : nulldevname;
346 outdev = out ? out->name : nulldevname;
347 /* We handle fragments by dealing with the first fragment as
348 * if it was a normal packet. All other fragments are treated
349 * normally, except that they will NEVER match rules that ask
350 * things we don't know, ie. tcp syn flag or ports). If the
351 * rule is also a fragment-specific rule, non-fragments won't
353 acpar.hotdrop = false;
356 acpar.family = NFPROTO_IPV6;
357 acpar.hooknum = hook;
359 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
362 private = table->private;
363 cpu = smp_processor_id();
364 table_base = private->entries[cpu];
365 jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];
366 stackptr = per_cpu_ptr(private->stackptr, cpu);
369 e = get_entry(table_base, private->hook_entry[hook]);
372 const struct xt_entry_target *t;
373 const struct xt_entry_match *ematch;
376 if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
377 &acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
379 e = ip6t_next_entry(e);
383 xt_ematch_foreach(ematch, e) {
384 acpar.match = ematch->u.kernel.match;
385 acpar.matchinfo = ematch->data;
386 if (!acpar.match->match(skb, &acpar))
390 ADD_COUNTER(e->counters, skb->len, 1);
392 t = ip6t_get_target_c(e);
393 IP_NF_ASSERT(t->u.kernel.target);
395 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
396 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
397 /* The packet is traced: log it */
398 if (unlikely(skb->nf_trace))
399 trace_packet(skb, hook, in, out,
400 table->name, private, e);
402 /* Standard target? */
403 if (!t->u.kernel.target->target) {
406 v = ((struct xt_standard_target *)t)->verdict;
408 /* Pop from stack? */
409 if (v != XT_RETURN) {
410 verdict = (unsigned)(-v) - 1;
414 e = get_entry(table_base,
415 private->underflow[hook]);
417 e = ip6t_next_entry(jumpstack[--*stackptr]);
420 if (table_base + v != ip6t_next_entry(e) &&
421 !(e->ipv6.flags & IP6T_F_GOTO)) {
422 if (*stackptr >= private->stacksize) {
426 jumpstack[(*stackptr)++] = e;
429 e = get_entry(table_base, v);
433 acpar.target = t->u.kernel.target;
434 acpar.targinfo = t->data;
436 verdict = t->u.kernel.target->target(skb, &acpar);
437 if (verdict == XT_CONTINUE)
438 e = ip6t_next_entry(e);
442 } while (!acpar.hotdrop);
444 xt_info_rdunlock_bh();
447 #ifdef DEBUG_ALLOW_ALL
456 /* Figures out from what hook each rule can be called: returns 0 if
457 there are loops. Puts hook bitmask in comefrom. */
459 mark_source_chains(const struct xt_table_info *newinfo,
460 unsigned int valid_hooks, void *entry0)
464 /* No recursion; use packet counter to save back ptrs (reset
465 to 0 as we leave), and comefrom to save source hook bitmask */
466 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
467 unsigned int pos = newinfo->hook_entry[hook];
468 struct ip6t_entry *e = (struct ip6t_entry *)(entry0 + pos);
470 if (!(valid_hooks & (1 << hook)))
473 /* Set initial back pointer. */
474 e->counters.pcnt = pos;
477 const struct xt_standard_target *t
478 = (void *)ip6t_get_target_c(e);
479 int visited = e->comefrom & (1 << hook);
481 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
482 pr_err("iptables: loop hook %u pos %u %08X.\n",
483 hook, pos, e->comefrom);
486 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
488 /* Unconditional return/END. */
489 if ((e->target_offset == sizeof(struct ip6t_entry) &&
490 (strcmp(t->target.u.user.name,
491 XT_STANDARD_TARGET) == 0) &&
493 unconditional(&e->ipv6)) || visited) {
494 unsigned int oldpos, size;
496 if ((strcmp(t->target.u.user.name,
497 XT_STANDARD_TARGET) == 0) &&
498 t->verdict < -NF_MAX_VERDICT - 1) {
499 duprintf("mark_source_chains: bad "
500 "negative verdict (%i)\n",
505 /* Return: backtrack through the last
508 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
509 #ifdef DEBUG_IP_FIREWALL_USER
511 & (1 << NF_INET_NUMHOOKS)) {
512 duprintf("Back unset "
519 pos = e->counters.pcnt;
520 e->counters.pcnt = 0;
522 /* We're at the start. */
526 e = (struct ip6t_entry *)
528 } while (oldpos == pos + e->next_offset);
531 size = e->next_offset;
532 e = (struct ip6t_entry *)
533 (entry0 + pos + size);
534 e->counters.pcnt = pos;
537 int newpos = t->verdict;
539 if (strcmp(t->target.u.user.name,
540 XT_STANDARD_TARGET) == 0 &&
542 if (newpos > newinfo->size -
543 sizeof(struct ip6t_entry)) {
544 duprintf("mark_source_chains: "
545 "bad verdict (%i)\n",
549 /* This a jump; chase it. */
550 duprintf("Jump rule %u -> %u\n",
553 /* ... this is a fallthru */
554 newpos = pos + e->next_offset;
556 e = (struct ip6t_entry *)
558 e->counters.pcnt = pos;
563 duprintf("Finished chain %u\n", hook);
568 static void cleanup_match(struct xt_entry_match *m, struct net *net)
570 struct xt_mtdtor_param par;
573 par.match = m->u.kernel.match;
574 par.matchinfo = m->data;
575 par.family = NFPROTO_IPV6;
576 if (par.match->destroy != NULL)
577 par.match->destroy(&par);
578 module_put(par.match->me);
582 check_entry(const struct ip6t_entry *e, const char *name)
584 const struct xt_entry_target *t;
586 if (!ip6_checkentry(&e->ipv6)) {
587 duprintf("ip_tables: ip check failed %p %s.\n", e, name);
591 if (e->target_offset + sizeof(struct xt_entry_target) >
595 t = ip6t_get_target_c(e);
596 if (e->target_offset + t->u.target_size > e->next_offset)
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 ret = check_entry(e, name);
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);
722 static bool check_underflow(const struct ip6t_entry *e)
724 const struct xt_entry_target *t;
725 unsigned int verdict;
727 if (!unconditional(&e->ipv6))
729 t = ip6t_get_target_c(e);
730 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
732 verdict = ((struct xt_standard_target *)t)->verdict;
733 verdict = -verdict - 1;
734 return verdict == NF_DROP || verdict == NF_ACCEPT;
738 check_entry_size_and_hooks(struct ip6t_entry *e,
739 struct xt_table_info *newinfo,
740 const unsigned char *base,
741 const unsigned char *limit,
742 const unsigned int *hook_entries,
743 const unsigned int *underflows,
744 unsigned int valid_hooks)
748 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
749 (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
750 duprintf("Bad offset %p\n", e);
755 < sizeof(struct ip6t_entry) + sizeof(struct xt_entry_target)) {
756 duprintf("checking: element %p size %u\n",
761 /* Check hooks & underflows */
762 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
763 if (!(valid_hooks & (1 << h)))
765 if ((unsigned char *)e - base == hook_entries[h])
766 newinfo->hook_entry[h] = hook_entries[h];
767 if ((unsigned char *)e - base == underflows[h]) {
768 if (!check_underflow(e)) {
769 pr_err("Underflows must be unconditional and "
770 "use the STANDARD target with "
774 newinfo->underflow[h] = underflows[h];
778 /* Clear counters and comefrom */
779 e->counters = ((struct xt_counters) { 0, 0 });
784 static void cleanup_entry(struct ip6t_entry *e, struct net *net)
786 struct xt_tgdtor_param par;
787 struct xt_entry_target *t;
788 struct xt_entry_match *ematch;
790 /* Cleanup all matches */
791 xt_ematch_foreach(ematch, e)
792 cleanup_match(ematch, net);
793 t = ip6t_get_target(e);
796 par.target = t->u.kernel.target;
797 par.targinfo = t->data;
798 par.family = NFPROTO_IPV6;
799 if (par.target->destroy != NULL)
800 par.target->destroy(&par);
801 module_put(par.target->me);
804 /* Checks and translates the user-supplied table segment (held in
807 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
808 const struct ip6t_replace *repl)
810 struct ip6t_entry *iter;
814 newinfo->size = repl->size;
815 newinfo->number = repl->num_entries;
817 /* Init all hooks to impossible value. */
818 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
819 newinfo->hook_entry[i] = 0xFFFFFFFF;
820 newinfo->underflow[i] = 0xFFFFFFFF;
823 duprintf("translate_table: size %u\n", newinfo->size);
825 /* Walk through entries, checking offsets. */
826 xt_entry_foreach(iter, entry0, newinfo->size) {
827 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
835 if (strcmp(ip6t_get_target(iter)->u.user.name,
836 XT_ERROR_TARGET) == 0)
837 ++newinfo->stacksize;
840 if (i != repl->num_entries) {
841 duprintf("translate_table: %u not %u entries\n",
842 i, repl->num_entries);
846 /* Check hooks all assigned */
847 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
848 /* Only hooks which are valid */
849 if (!(repl->valid_hooks & (1 << i)))
851 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
852 duprintf("Invalid hook entry %u %u\n",
853 i, repl->hook_entry[i]);
856 if (newinfo->underflow[i] == 0xFFFFFFFF) {
857 duprintf("Invalid underflow %u %u\n",
858 i, repl->underflow[i]);
863 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
866 /* Finally, each sanity check must pass */
868 xt_entry_foreach(iter, entry0, newinfo->size) {
869 ret = find_check_entry(iter, net, repl->name, repl->size);
876 xt_entry_foreach(iter, entry0, newinfo->size) {
879 cleanup_entry(iter, net);
884 /* And one copy for every other CPU */
885 for_each_possible_cpu(i) {
886 if (newinfo->entries[i] && newinfo->entries[i] != entry0)
887 memcpy(newinfo->entries[i], entry0, newinfo->size);
894 get_counters(const struct xt_table_info *t,
895 struct xt_counters counters[])
897 struct ip6t_entry *iter;
901 for_each_possible_cpu(cpu) {
902 seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock;
905 xt_entry_foreach(iter, t->entries[cpu], t->size) {
910 start = read_seqbegin(lock);
911 bcnt = iter->counters.bcnt;
912 pcnt = iter->counters.pcnt;
913 } while (read_seqretry(lock, start));
915 ADD_COUNTER(counters[i], bcnt, pcnt);
921 static struct xt_counters *alloc_counters(const struct xt_table *table)
923 unsigned int countersize;
924 struct xt_counters *counters;
925 const struct xt_table_info *private = table->private;
927 /* We need atomic snapshot of counters: rest doesn't change
928 (other than comefrom, which userspace doesn't care
930 countersize = sizeof(struct xt_counters) * private->number;
931 counters = vzalloc(countersize);
933 if (counters == NULL)
934 return ERR_PTR(-ENOMEM);
936 get_counters(private, counters);
942 copy_entries_to_user(unsigned int total_size,
943 const struct xt_table *table,
944 void __user *userptr)
946 unsigned int off, num;
947 const struct ip6t_entry *e;
948 struct xt_counters *counters;
949 const struct xt_table_info *private = table->private;
951 const void *loc_cpu_entry;
953 counters = alloc_counters(table);
954 if (IS_ERR(counters))
955 return PTR_ERR(counters);
957 /* choose the copy that is on our node/cpu, ...
958 * This choice is lazy (because current thread is
959 * allowed to migrate to another cpu)
961 loc_cpu_entry = private->entries[raw_smp_processor_id()];
962 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
967 /* FIXME: use iterator macros --RR */
968 /* ... then go back and fix counters and names */
969 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
971 const struct xt_entry_match *m;
972 const struct xt_entry_target *t;
974 e = (struct ip6t_entry *)(loc_cpu_entry + off);
975 if (copy_to_user(userptr + off
976 + offsetof(struct ip6t_entry, counters),
978 sizeof(counters[num])) != 0) {
983 for (i = sizeof(struct ip6t_entry);
984 i < e->target_offset;
985 i += m->u.match_size) {
988 if (copy_to_user(userptr + off + i
989 + offsetof(struct xt_entry_match,
991 m->u.kernel.match->name,
992 strlen(m->u.kernel.match->name)+1)
999 t = ip6t_get_target_c(e);
1000 if (copy_to_user(userptr + off + e->target_offset
1001 + offsetof(struct xt_entry_target,
1003 t->u.kernel.target->name,
1004 strlen(t->u.kernel.target->name)+1) != 0) {
1015 #ifdef CONFIG_COMPAT
1016 static void compat_standard_from_user(void *dst, const void *src)
1018 int v = *(compat_int_t *)src;
1021 v += xt_compat_calc_jump(AF_INET6, v);
1022 memcpy(dst, &v, sizeof(v));
1025 static int compat_standard_to_user(void __user *dst, const void *src)
1027 compat_int_t cv = *(int *)src;
1030 cv -= xt_compat_calc_jump(AF_INET6, cv);
1031 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
1034 static int compat_calc_entry(const struct ip6t_entry *e,
1035 const struct xt_table_info *info,
1036 const void *base, struct xt_table_info *newinfo)
1038 const struct xt_entry_match *ematch;
1039 const struct xt_entry_target *t;
1040 unsigned int entry_offset;
1043 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1044 entry_offset = (void *)e - base;
1045 xt_ematch_foreach(ematch, e)
1046 off += xt_compat_match_offset(ematch->u.kernel.match);
1047 t = ip6t_get_target_c(e);
1048 off += xt_compat_target_offset(t->u.kernel.target);
1049 newinfo->size -= off;
1050 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1054 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1055 if (info->hook_entry[i] &&
1056 (e < (struct ip6t_entry *)(base + info->hook_entry[i])))
1057 newinfo->hook_entry[i] -= off;
1058 if (info->underflow[i] &&
1059 (e < (struct ip6t_entry *)(base + info->underflow[i])))
1060 newinfo->underflow[i] -= off;
1065 static int compat_table_info(const struct xt_table_info *info,
1066 struct xt_table_info *newinfo)
1068 struct ip6t_entry *iter;
1069 void *loc_cpu_entry;
1072 if (!newinfo || !info)
1075 /* we dont care about newinfo->entries[] */
1076 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
1077 newinfo->initial_entries = 0;
1078 loc_cpu_entry = info->entries[raw_smp_processor_id()];
1079 xt_compat_init_offsets(AF_INET6, info->number);
1080 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
1081 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
1089 static int get_info(struct net *net, void __user *user,
1090 const int *len, int compat)
1092 char name[XT_TABLE_MAXNAMELEN];
1096 if (*len != sizeof(struct ip6t_getinfo)) {
1097 duprintf("length %u != %zu\n", *len,
1098 sizeof(struct ip6t_getinfo));
1102 if (copy_from_user(name, user, sizeof(name)) != 0)
1105 name[XT_TABLE_MAXNAMELEN-1] = '\0';
1106 #ifdef CONFIG_COMPAT
1108 xt_compat_lock(AF_INET6);
1110 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1111 "ip6table_%s", name);
1112 if (t && !IS_ERR(t)) {
1113 struct ip6t_getinfo info;
1114 const struct xt_table_info *private = t->private;
1115 #ifdef CONFIG_COMPAT
1116 struct xt_table_info tmp;
1119 ret = compat_table_info(private, &tmp);
1120 xt_compat_flush_offsets(AF_INET6);
1124 memset(&info, 0, sizeof(info));
1125 info.valid_hooks = t->valid_hooks;
1126 memcpy(info.hook_entry, private->hook_entry,
1127 sizeof(info.hook_entry));
1128 memcpy(info.underflow, private->underflow,
1129 sizeof(info.underflow));
1130 info.num_entries = private->number;
1131 info.size = private->size;
1132 strcpy(info.name, name);
1134 if (copy_to_user(user, &info, *len) != 0)
1142 ret = t ? PTR_ERR(t) : -ENOENT;
1143 #ifdef CONFIG_COMPAT
1145 xt_compat_unlock(AF_INET6);
1151 get_entries(struct net *net, struct ip6t_get_entries __user *uptr,
1155 struct ip6t_get_entries get;
1158 if (*len < sizeof(get)) {
1159 duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
1162 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1164 if (*len != sizeof(struct ip6t_get_entries) + get.size) {
1165 duprintf("get_entries: %u != %zu\n",
1166 *len, sizeof(get) + get.size);
1170 t = xt_find_table_lock(net, AF_INET6, get.name);
1171 if (t && !IS_ERR(t)) {
1172 struct xt_table_info *private = t->private;
1173 duprintf("t->private->number = %u\n", private->number);
1174 if (get.size == private->size)
1175 ret = copy_entries_to_user(private->size,
1176 t, uptr->entrytable);
1178 duprintf("get_entries: I've got %u not %u!\n",
1179 private->size, get.size);
1185 ret = t ? PTR_ERR(t) : -ENOENT;
1191 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1192 struct xt_table_info *newinfo, unsigned int num_counters,
1193 void __user *counters_ptr)
1197 struct xt_table_info *oldinfo;
1198 struct xt_counters *counters;
1199 const void *loc_cpu_old_entry;
1200 struct ip6t_entry *iter;
1203 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1209 t = try_then_request_module(xt_find_table_lock(net, AF_INET6, name),
1210 "ip6table_%s", name);
1211 if (!t || IS_ERR(t)) {
1212 ret = t ? PTR_ERR(t) : -ENOENT;
1213 goto free_newinfo_counters_untrans;
1217 if (valid_hooks != t->valid_hooks) {
1218 duprintf("Valid hook crap: %08X vs %08X\n",
1219 valid_hooks, t->valid_hooks);
1224 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1228 /* Update module usage count based on number of rules */
1229 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1230 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1231 if ((oldinfo->number > oldinfo->initial_entries) ||
1232 (newinfo->number <= oldinfo->initial_entries))
1234 if ((oldinfo->number > oldinfo->initial_entries) &&
1235 (newinfo->number <= oldinfo->initial_entries))
1238 /* Get the old counters, and synchronize with replace */
1239 get_counters(oldinfo, counters);
1241 /* Decrease module usage counts and free resource */
1242 loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
1243 xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
1244 cleanup_entry(iter, net);
1246 xt_free_table_info(oldinfo);
1247 if (copy_to_user(counters_ptr, counters,
1248 sizeof(struct xt_counters) * num_counters) != 0)
1257 free_newinfo_counters_untrans:
1264 do_replace(struct net *net, const void __user *user, unsigned int len)
1267 struct ip6t_replace tmp;
1268 struct xt_table_info *newinfo;
1269 void *loc_cpu_entry;
1270 struct ip6t_entry *iter;
1272 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1275 /* overflow check */
1276 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1279 newinfo = xt_alloc_table_info(tmp.size);
1283 /* choose the copy that is on our node/cpu */
1284 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1285 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1291 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1295 duprintf("ip_tables: Translated table\n");
1297 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1298 tmp.num_counters, tmp.counters);
1300 goto free_newinfo_untrans;
1303 free_newinfo_untrans:
1304 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1305 cleanup_entry(iter, net);
1307 xt_free_table_info(newinfo);
1312 do_add_counters(struct net *net, const void __user *user, unsigned int len,
1315 unsigned int i, curcpu;
1316 struct xt_counters_info tmp;
1317 struct xt_counters *paddc;
1318 unsigned int num_counters;
1323 const struct xt_table_info *private;
1325 const void *loc_cpu_entry;
1326 struct ip6t_entry *iter;
1327 #ifdef CONFIG_COMPAT
1328 struct compat_xt_counters_info compat_tmp;
1332 size = sizeof(struct compat_xt_counters_info);
1337 size = sizeof(struct xt_counters_info);
1340 if (copy_from_user(ptmp, user, size) != 0)
1343 #ifdef CONFIG_COMPAT
1345 num_counters = compat_tmp.num_counters;
1346 name = compat_tmp.name;
1350 num_counters = tmp.num_counters;
1354 if (len != size + num_counters * sizeof(struct xt_counters))
1357 paddc = vmalloc(len - size);
1361 if (copy_from_user(paddc, user + size, len - size) != 0) {
1366 t = xt_find_table_lock(net, AF_INET6, name);
1367 if (!t || IS_ERR(t)) {
1368 ret = t ? PTR_ERR(t) : -ENOENT;
1374 private = t->private;
1375 if (private->number != num_counters) {
1377 goto unlock_up_free;
1381 /* Choose the copy that is on our node */
1382 curcpu = smp_processor_id();
1383 xt_info_wrlock(curcpu);
1384 loc_cpu_entry = private->entries[curcpu];
1385 xt_entry_foreach(iter, loc_cpu_entry, private->size) {
1386 ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
1389 xt_info_wrunlock(curcpu);
1401 #ifdef CONFIG_COMPAT
1402 struct compat_ip6t_replace {
1403 char name[XT_TABLE_MAXNAMELEN];
1407 u32 hook_entry[NF_INET_NUMHOOKS];
1408 u32 underflow[NF_INET_NUMHOOKS];
1410 compat_uptr_t counters; /* struct xt_counters * */
1411 struct compat_ip6t_entry entries[0];
1415 compat_copy_entry_to_user(struct ip6t_entry *e, void __user **dstptr,
1416 unsigned int *size, struct xt_counters *counters,
1419 struct xt_entry_target *t;
1420 struct compat_ip6t_entry __user *ce;
1421 u_int16_t target_offset, next_offset;
1422 compat_uint_t origsize;
1423 const struct xt_entry_match *ematch;
1427 ce = (struct compat_ip6t_entry __user *)*dstptr;
1428 if (copy_to_user(ce, e, sizeof(struct ip6t_entry)) != 0 ||
1429 copy_to_user(&ce->counters, &counters[i],
1430 sizeof(counters[i])) != 0)
1433 *dstptr += sizeof(struct compat_ip6t_entry);
1434 *size -= sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1436 xt_ematch_foreach(ematch, e) {
1437 ret = xt_compat_match_to_user(ematch, dstptr, size);
1441 target_offset = e->target_offset - (origsize - *size);
1442 t = ip6t_get_target(e);
1443 ret = xt_compat_target_to_user(t, dstptr, size);
1446 next_offset = e->next_offset - (origsize - *size);
1447 if (put_user(target_offset, &ce->target_offset) != 0 ||
1448 put_user(next_offset, &ce->next_offset) != 0)
1454 compat_find_calc_match(struct xt_entry_match *m,
1456 const struct ip6t_ip6 *ipv6,
1457 unsigned int hookmask,
1460 struct xt_match *match;
1462 match = xt_request_find_match(NFPROTO_IPV6, m->u.user.name,
1463 m->u.user.revision);
1464 if (IS_ERR(match)) {
1465 duprintf("compat_check_calc_match: `%s' not found\n",
1467 return PTR_ERR(match);
1469 m->u.kernel.match = match;
1470 *size += xt_compat_match_offset(match);
1474 static void compat_release_entry(struct compat_ip6t_entry *e)
1476 struct xt_entry_target *t;
1477 struct xt_entry_match *ematch;
1479 /* Cleanup all matches */
1480 xt_ematch_foreach(ematch, e)
1481 module_put(ematch->u.kernel.match->me);
1482 t = compat_ip6t_get_target(e);
1483 module_put(t->u.kernel.target->me);
1487 check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
1488 struct xt_table_info *newinfo,
1490 const unsigned char *base,
1491 const unsigned char *limit,
1492 const unsigned int *hook_entries,
1493 const unsigned int *underflows,
1496 struct xt_entry_match *ematch;
1497 struct xt_entry_target *t;
1498 struct xt_target *target;
1499 unsigned int entry_offset;
1503 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1504 if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
1505 (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
1506 duprintf("Bad offset %p, limit = %p\n", e, limit);
1510 if (e->next_offset < sizeof(struct compat_ip6t_entry) +
1511 sizeof(struct compat_xt_entry_target)) {
1512 duprintf("checking: element %p size %u\n",
1517 /* For purposes of check_entry casting the compat entry is fine */
1518 ret = check_entry((struct ip6t_entry *)e, name);
1522 off = sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1523 entry_offset = (void *)e - (void *)base;
1525 xt_ematch_foreach(ematch, e) {
1526 ret = compat_find_calc_match(ematch, name,
1527 &e->ipv6, e->comefrom, &off);
1529 goto release_matches;
1533 t = compat_ip6t_get_target(e);
1534 target = xt_request_find_target(NFPROTO_IPV6, t->u.user.name,
1535 t->u.user.revision);
1536 if (IS_ERR(target)) {
1537 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1539 ret = PTR_ERR(target);
1540 goto release_matches;
1542 t->u.kernel.target = target;
1544 off += xt_compat_target_offset(target);
1546 ret = xt_compat_add_offset(AF_INET6, entry_offset, off);
1550 /* Check hooks & underflows */
1551 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1552 if ((unsigned char *)e - base == hook_entries[h])
1553 newinfo->hook_entry[h] = hook_entries[h];
1554 if ((unsigned char *)e - base == underflows[h])
1555 newinfo->underflow[h] = underflows[h];
1558 /* Clear counters and comefrom */
1559 memset(&e->counters, 0, sizeof(e->counters));
1564 module_put(t->u.kernel.target->me);
1566 xt_ematch_foreach(ematch, e) {
1569 module_put(ematch->u.kernel.match->me);
1575 compat_copy_entry_from_user(struct compat_ip6t_entry *e, void **dstptr,
1576 unsigned int *size, const char *name,
1577 struct xt_table_info *newinfo, unsigned char *base)
1579 struct xt_entry_target *t;
1580 struct xt_target *target;
1581 struct ip6t_entry *de;
1582 unsigned int origsize;
1584 struct xt_entry_match *ematch;
1588 de = (struct ip6t_entry *)*dstptr;
1589 memcpy(de, e, sizeof(struct ip6t_entry));
1590 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1592 *dstptr += sizeof(struct ip6t_entry);
1593 *size += sizeof(struct ip6t_entry) - sizeof(struct compat_ip6t_entry);
1595 xt_ematch_foreach(ematch, e) {
1596 ret = xt_compat_match_from_user(ematch, dstptr, size);
1600 de->target_offset = e->target_offset - (origsize - *size);
1601 t = compat_ip6t_get_target(e);
1602 target = t->u.kernel.target;
1603 xt_compat_target_from_user(t, dstptr, size);
1605 de->next_offset = e->next_offset - (origsize - *size);
1606 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1607 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1608 newinfo->hook_entry[h] -= origsize - *size;
1609 if ((unsigned char *)de - base < newinfo->underflow[h])
1610 newinfo->underflow[h] -= origsize - *size;
1615 static int compat_check_entry(struct ip6t_entry *e, struct net *net,
1620 struct xt_mtchk_param mtpar;
1621 struct xt_entry_match *ematch;
1626 mtpar.entryinfo = &e->ipv6;
1627 mtpar.hook_mask = e->comefrom;
1628 mtpar.family = NFPROTO_IPV6;
1629 xt_ematch_foreach(ematch, e) {
1630 ret = check_match(ematch, &mtpar);
1632 goto cleanup_matches;
1636 ret = check_target(e, net, name);
1638 goto cleanup_matches;
1642 xt_ematch_foreach(ematch, e) {
1645 cleanup_match(ematch, net);
1651 translate_compat_table(struct net *net,
1653 unsigned int valid_hooks,
1654 struct xt_table_info **pinfo,
1656 unsigned int total_size,
1657 unsigned int number,
1658 unsigned int *hook_entries,
1659 unsigned int *underflows)
1662 struct xt_table_info *newinfo, *info;
1663 void *pos, *entry0, *entry1;
1664 struct compat_ip6t_entry *iter0;
1665 struct ip6t_entry *iter1;
1672 info->number = number;
1674 /* Init all hooks to impossible value. */
1675 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1676 info->hook_entry[i] = 0xFFFFFFFF;
1677 info->underflow[i] = 0xFFFFFFFF;
1680 duprintf("translate_compat_table: size %u\n", info->size);
1682 xt_compat_lock(AF_INET6);
1683 xt_compat_init_offsets(AF_INET6, number);
1684 /* Walk through entries, checking offsets. */
1685 xt_entry_foreach(iter0, entry0, total_size) {
1686 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1688 entry0 + total_size,
1699 duprintf("translate_compat_table: %u not %u entries\n",
1704 /* Check hooks all assigned */
1705 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1706 /* Only hooks which are valid */
1707 if (!(valid_hooks & (1 << i)))
1709 if (info->hook_entry[i] == 0xFFFFFFFF) {
1710 duprintf("Invalid hook entry %u %u\n",
1711 i, hook_entries[i]);
1714 if (info->underflow[i] == 0xFFFFFFFF) {
1715 duprintf("Invalid underflow %u %u\n",
1722 newinfo = xt_alloc_table_info(size);
1726 newinfo->number = number;
1727 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1728 newinfo->hook_entry[i] = info->hook_entry[i];
1729 newinfo->underflow[i] = info->underflow[i];
1731 entry1 = newinfo->entries[raw_smp_processor_id()];
1734 xt_entry_foreach(iter0, entry0, total_size) {
1735 ret = compat_copy_entry_from_user(iter0, &pos, &size,
1736 name, newinfo, entry1);
1740 xt_compat_flush_offsets(AF_INET6);
1741 xt_compat_unlock(AF_INET6);
1746 if (!mark_source_chains(newinfo, valid_hooks, entry1))
1750 xt_entry_foreach(iter1, entry1, newinfo->size) {
1751 ret = compat_check_entry(iter1, net, name);
1755 if (strcmp(ip6t_get_target(iter1)->u.user.name,
1756 XT_ERROR_TARGET) == 0)
1757 ++newinfo->stacksize;
1761 * The first i matches need cleanup_entry (calls ->destroy)
1762 * because they had called ->check already. The other j-i
1763 * entries need only release.
1767 xt_entry_foreach(iter0, entry0, newinfo->size) {
1772 compat_release_entry(iter0);
1774 xt_entry_foreach(iter1, entry1, newinfo->size) {
1777 cleanup_entry(iter1, net);
1779 xt_free_table_info(newinfo);
1783 /* And one copy for every other CPU */
1784 for_each_possible_cpu(i)
1785 if (newinfo->entries[i] && newinfo->entries[i] != entry1)
1786 memcpy(newinfo->entries[i], entry1, newinfo->size);
1790 xt_free_table_info(info);
1794 xt_free_table_info(newinfo);
1796 xt_entry_foreach(iter0, entry0, total_size) {
1799 compat_release_entry(iter0);
1803 xt_compat_flush_offsets(AF_INET6);
1804 xt_compat_unlock(AF_INET6);
1809 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1812 struct compat_ip6t_replace tmp;
1813 struct xt_table_info *newinfo;
1814 void *loc_cpu_entry;
1815 struct ip6t_entry *iter;
1817 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1820 /* overflow check */
1821 if (tmp.size >= INT_MAX / num_possible_cpus())
1823 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1826 newinfo = xt_alloc_table_info(tmp.size);
1830 /* choose the copy that is on our node/cpu */
1831 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1832 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1838 ret = translate_compat_table(net, tmp.name, tmp.valid_hooks,
1839 &newinfo, &loc_cpu_entry, tmp.size,
1840 tmp.num_entries, tmp.hook_entry,
1845 duprintf("compat_do_replace: Translated table\n");
1847 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1848 tmp.num_counters, compat_ptr(tmp.counters));
1850 goto free_newinfo_untrans;
1853 free_newinfo_untrans:
1854 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1855 cleanup_entry(iter, net);
1857 xt_free_table_info(newinfo);
1862 compat_do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user,
1867 if (!capable(CAP_NET_ADMIN))
1871 case IP6T_SO_SET_REPLACE:
1872 ret = compat_do_replace(sock_net(sk), user, len);
1875 case IP6T_SO_SET_ADD_COUNTERS:
1876 ret = do_add_counters(sock_net(sk), user, len, 1);
1880 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
1887 struct compat_ip6t_get_entries {
1888 char name[XT_TABLE_MAXNAMELEN];
1890 struct compat_ip6t_entry entrytable[0];
1894 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1895 void __user *userptr)
1897 struct xt_counters *counters;
1898 const struct xt_table_info *private = table->private;
1902 const void *loc_cpu_entry;
1904 struct ip6t_entry *iter;
1906 counters = alloc_counters(table);
1907 if (IS_ERR(counters))
1908 return PTR_ERR(counters);
1910 /* choose the copy that is on our node/cpu, ...
1911 * This choice is lazy (because current thread is
1912 * allowed to migrate to another cpu)
1914 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1917 xt_entry_foreach(iter, loc_cpu_entry, total_size) {
1918 ret = compat_copy_entry_to_user(iter, &pos,
1919 &size, counters, i++);
1929 compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr,
1933 struct compat_ip6t_get_entries get;
1936 if (*len < sizeof(get)) {
1937 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1941 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1944 if (*len != sizeof(struct compat_ip6t_get_entries) + get.size) {
1945 duprintf("compat_get_entries: %u != %zu\n",
1946 *len, sizeof(get) + get.size);
1950 xt_compat_lock(AF_INET6);
1951 t = xt_find_table_lock(net, AF_INET6, get.name);
1952 if (t && !IS_ERR(t)) {
1953 const struct xt_table_info *private = t->private;
1954 struct xt_table_info info;
1955 duprintf("t->private->number = %u\n", private->number);
1956 ret = compat_table_info(private, &info);
1957 if (!ret && get.size == info.size) {
1958 ret = compat_copy_entries_to_user(private->size,
1959 t, uptr->entrytable);
1961 duprintf("compat_get_entries: I've got %u not %u!\n",
1962 private->size, get.size);
1965 xt_compat_flush_offsets(AF_INET6);
1969 ret = t ? PTR_ERR(t) : -ENOENT;
1971 xt_compat_unlock(AF_INET6);
1975 static int do_ip6t_get_ctl(struct sock *, int, void __user *, int *);
1978 compat_do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1982 if (!capable(CAP_NET_ADMIN))
1986 case IP6T_SO_GET_INFO:
1987 ret = get_info(sock_net(sk), user, len, 1);
1989 case IP6T_SO_GET_ENTRIES:
1990 ret = compat_get_entries(sock_net(sk), user, len);
1993 ret = do_ip6t_get_ctl(sk, cmd, user, len);
2000 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2004 if (!capable(CAP_NET_ADMIN))
2008 case IP6T_SO_SET_REPLACE:
2009 ret = do_replace(sock_net(sk), user, len);
2012 case IP6T_SO_SET_ADD_COUNTERS:
2013 ret = do_add_counters(sock_net(sk), user, len, 0);
2017 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
2025 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2029 if (!capable(CAP_NET_ADMIN))
2033 case IP6T_SO_GET_INFO:
2034 ret = get_info(sock_net(sk), user, len, 0);
2037 case IP6T_SO_GET_ENTRIES:
2038 ret = get_entries(sock_net(sk), user, len);
2041 case IP6T_SO_GET_REVISION_MATCH:
2042 case IP6T_SO_GET_REVISION_TARGET: {
2043 struct xt_get_revision rev;
2046 if (*len != sizeof(rev)) {
2050 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
2055 if (cmd == IP6T_SO_GET_REVISION_TARGET)
2060 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
2063 "ip6t_%s", rev.name);
2068 duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
2075 struct xt_table *ip6t_register_table(struct net *net,
2076 const struct xt_table *table,
2077 const struct ip6t_replace *repl)
2080 struct xt_table_info *newinfo;
2081 struct xt_table_info bootstrap = {0};
2082 void *loc_cpu_entry;
2083 struct xt_table *new_table;
2085 newinfo = xt_alloc_table_info(repl->size);
2091 /* choose the copy on our node/cpu, but dont care about preemption */
2092 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
2093 memcpy(loc_cpu_entry, repl->entries, repl->size);
2095 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
2099 new_table = xt_register_table(net, table, &bootstrap, newinfo);
2100 if (IS_ERR(new_table)) {
2101 ret = PTR_ERR(new_table);
2107 xt_free_table_info(newinfo);
2109 return ERR_PTR(ret);
2112 void ip6t_unregister_table(struct net *net, struct xt_table *table)
2114 struct xt_table_info *private;
2115 void *loc_cpu_entry;
2116 struct module *table_owner = table->me;
2117 struct ip6t_entry *iter;
2119 private = xt_unregister_table(table);
2121 /* Decrease module usage counts and free resources */
2122 loc_cpu_entry = private->entries[raw_smp_processor_id()];
2123 xt_entry_foreach(iter, loc_cpu_entry, private->size)
2124 cleanup_entry(iter, net);
2125 if (private->number > private->initial_entries)
2126 module_put(table_owner);
2127 xt_free_table_info(private);
2130 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2132 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2133 u_int8_t type, u_int8_t code,
2136 return (type == test_type && code >= min_code && code <= max_code)
2141 icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
2143 const struct icmp6hdr *ic;
2144 struct icmp6hdr _icmph;
2145 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2147 /* Must not be a fragment. */
2148 if (par->fragoff != 0)
2151 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
2153 /* We've been asked to examine this packet, and we
2154 * can't. Hence, no choice but to drop.
2156 duprintf("Dropping evil ICMP tinygram.\n");
2157 par->hotdrop = true;
2161 return icmp6_type_code_match(icmpinfo->type,
2164 ic->icmp6_type, ic->icmp6_code,
2165 !!(icmpinfo->invflags&IP6T_ICMP_INV));
2168 /* Called when user tries to insert an entry of this type. */
2169 static int icmp6_checkentry(const struct xt_mtchk_param *par)
2171 const struct ip6t_icmp *icmpinfo = par->matchinfo;
2173 /* Must specify no unknown invflags */
2174 return (icmpinfo->invflags & ~IP6T_ICMP_INV) ? -EINVAL : 0;
2177 /* The built-in targets: standard (NULL) and error. */
2178 static struct xt_target ip6t_builtin_tg[] __read_mostly = {
2180 .name = XT_STANDARD_TARGET,
2181 .targetsize = sizeof(int),
2182 .family = NFPROTO_IPV6,
2183 #ifdef CONFIG_COMPAT
2184 .compatsize = sizeof(compat_int_t),
2185 .compat_from_user = compat_standard_from_user,
2186 .compat_to_user = compat_standard_to_user,
2190 .name = XT_ERROR_TARGET,
2191 .target = ip6t_error,
2192 .targetsize = XT_FUNCTION_MAXNAMELEN,
2193 .family = NFPROTO_IPV6,
2197 static struct nf_sockopt_ops ip6t_sockopts = {
2199 .set_optmin = IP6T_BASE_CTL,
2200 .set_optmax = IP6T_SO_SET_MAX+1,
2201 .set = do_ip6t_set_ctl,
2202 #ifdef CONFIG_COMPAT
2203 .compat_set = compat_do_ip6t_set_ctl,
2205 .get_optmin = IP6T_BASE_CTL,
2206 .get_optmax = IP6T_SO_GET_MAX+1,
2207 .get = do_ip6t_get_ctl,
2208 #ifdef CONFIG_COMPAT
2209 .compat_get = compat_do_ip6t_get_ctl,
2211 .owner = THIS_MODULE,
2214 static struct xt_match ip6t_builtin_mt[] __read_mostly = {
2217 .match = icmp6_match,
2218 .matchsize = sizeof(struct ip6t_icmp),
2219 .checkentry = icmp6_checkentry,
2220 .proto = IPPROTO_ICMPV6,
2221 .family = NFPROTO_IPV6,
2225 static int __net_init ip6_tables_net_init(struct net *net)
2227 return xt_proto_init(net, NFPROTO_IPV6);
2230 static void __net_exit ip6_tables_net_exit(struct net *net)
2232 xt_proto_fini(net, NFPROTO_IPV6);
2235 static struct pernet_operations ip6_tables_net_ops = {
2236 .init = ip6_tables_net_init,
2237 .exit = ip6_tables_net_exit,
2240 static int __init ip6_tables_init(void)
2244 ret = register_pernet_subsys(&ip6_tables_net_ops);
2248 /* Noone else will be downing sem now, so we won't sleep */
2249 ret = xt_register_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2252 ret = xt_register_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2256 /* Register setsockopt */
2257 ret = nf_register_sockopt(&ip6t_sockopts);
2261 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2265 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2267 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2269 unregister_pernet_subsys(&ip6_tables_net_ops);
2274 static void __exit ip6_tables_fini(void)
2276 nf_unregister_sockopt(&ip6t_sockopts);
2278 xt_unregister_matches(ip6t_builtin_mt, ARRAY_SIZE(ip6t_builtin_mt));
2279 xt_unregister_targets(ip6t_builtin_tg, ARRAY_SIZE(ip6t_builtin_tg));
2280 unregister_pernet_subsys(&ip6_tables_net_ops);
2284 * find the offset to specified header or the protocol number of last header
2285 * if target < 0. "last header" is transport protocol header, ESP, or
2288 * If target header is found, its offset is set in *offset and return protocol
2289 * number. Otherwise, return -1.
2291 * If the first fragment doesn't contain the final protocol header or
2292 * NEXTHDR_NONE it is considered invalid.
2294 * Note that non-1st fragment is special case that "the protocol number
2295 * of last header" is "next header" field in Fragment header. In this case,
2296 * *offset is meaningless and fragment offset is stored in *fragoff if fragoff
2300 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
2301 int target, unsigned short *fragoff)
2303 unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
2304 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
2305 unsigned int len = skb->len - start;
2310 while (nexthdr != target) {
2311 struct ipv6_opt_hdr _hdr, *hp;
2312 unsigned int hdrlen;
2314 if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) {
2320 hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
2323 if (nexthdr == NEXTHDR_FRAGMENT) {
2324 unsigned short _frag_off;
2326 fp = skb_header_pointer(skb,
2327 start+offsetof(struct frag_hdr,
2334 _frag_off = ntohs(*fp) & ~0x7;
2337 ((!ipv6_ext_hdr(hp->nexthdr)) ||
2338 hp->nexthdr == NEXTHDR_NONE)) {
2340 *fragoff = _frag_off;
2346 } else if (nexthdr == NEXTHDR_AUTH)
2347 hdrlen = (hp->hdrlen + 2) << 2;
2349 hdrlen = ipv6_optlen(hp);
2351 nexthdr = hp->nexthdr;
2360 EXPORT_SYMBOL(ip6t_register_table);
2361 EXPORT_SYMBOL(ip6t_unregister_table);
2362 EXPORT_SYMBOL(ip6t_do_table);
2363 EXPORT_SYMBOL(ip6t_ext_hdr);
2364 EXPORT_SYMBOL(ipv6_find_hdr);
2366 module_init(ip6_tables_init);
2367 module_exit(ip6_tables_fini);