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.
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 <asm/uaccess.h>
23 #include <linux/mutex.h>
24 #include <linux/proc_fs.h>
25 #include <linux/cpumask.h>
27 #include <linux/netfilter_ipv6/ip6_tables.h>
28 #include <linux/netfilter/x_tables.h>
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
32 MODULE_DESCRIPTION("IPv6 packet filter");
34 /*#define DEBUG_IP_FIREWALL*/
35 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
36 /*#define DEBUG_IP_FIREWALL_USER*/
38 #ifdef DEBUG_IP_FIREWALL
39 #define dprintf(format, args...) printk(format , ## args)
41 #define dprintf(format, args...)
44 #ifdef DEBUG_IP_FIREWALL_USER
45 #define duprintf(format, args...) printk(format , ## args)
47 #define duprintf(format, args...)
50 #ifdef CONFIG_NETFILTER_DEBUG
51 #define IP_NF_ASSERT(x) \
54 printk("IP_NF_ASSERT: %s:%s:%u\n", \
55 __FUNCTION__, __FILE__, __LINE__); \
58 #define IP_NF_ASSERT(x)
62 /* All the better to debug you with... */
68 We keep a set of rules for each CPU, so we can avoid write-locking
69 them in the softirq when updating the counters and therefore
70 only need to read-lock in the softirq; doing a write_lock_bh() in user
71 context stops packets coming through and allows user context to read
72 the counters or update the rules.
74 Hence the start of any table is given by get_table() below. */
76 /* Check for an extension */
78 ip6t_ext_hdr(u8 nexthdr)
80 return ( (nexthdr == IPPROTO_HOPOPTS) ||
81 (nexthdr == IPPROTO_ROUTING) ||
82 (nexthdr == IPPROTO_FRAGMENT) ||
83 (nexthdr == IPPROTO_ESP) ||
84 (nexthdr == IPPROTO_AH) ||
85 (nexthdr == IPPROTO_NONE) ||
86 (nexthdr == IPPROTO_DSTOPTS) );
89 /* Returns whether matches rule or not. */
91 ip6_packet_match(const struct sk_buff *skb,
94 const struct ip6t_ip6 *ip6info,
95 unsigned int *protoff,
96 int *fragoff, bool *hotdrop)
100 const struct ipv6hdr *ipv6 = ipv6_hdr(skb);
102 #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg))
104 if (FWINV(ipv6_masked_addr_cmp(&ipv6->saddr, &ip6info->smsk,
105 &ip6info->src), IP6T_INV_SRCIP)
106 || FWINV(ipv6_masked_addr_cmp(&ipv6->daddr, &ip6info->dmsk,
107 &ip6info->dst), IP6T_INV_DSTIP)) {
108 dprintf("Source or dest mismatch.\n");
110 dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
111 ipinfo->smsk.s_addr, ipinfo->src.s_addr,
112 ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
113 dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
114 ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
115 ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
119 /* Look for ifname matches; this should unroll nicely. */
120 for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
121 ret |= (((const unsigned long *)indev)[i]
122 ^ ((const unsigned long *)ip6info->iniface)[i])
123 & ((const unsigned long *)ip6info->iniface_mask)[i];
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 for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
134 ret |= (((const unsigned long *)outdev)[i]
135 ^ ((const unsigned long *)ip6info->outiface)[i])
136 & ((const unsigned long *)ip6info->outiface_mask)[i];
139 if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
140 dprintf("VIA out mismatch (%s vs %s).%s\n",
141 outdev, ip6info->outiface,
142 ip6info->invflags&IP6T_INV_VIA_OUT ?" (INV)":"");
146 /* ... might want to do something with class and flowlabel here ... */
148 /* look for the desired protocol header */
149 if((ip6info->flags & IP6T_F_PROTO)) {
151 unsigned short _frag_off;
153 protohdr = ipv6_find_hdr(skb, protoff, -1, &_frag_off);
159 *fragoff = _frag_off;
161 dprintf("Packet protocol %hi ?= %s%hi.\n",
163 ip6info->invflags & IP6T_INV_PROTO ? "!":"",
166 if (ip6info->proto == protohdr) {
167 if(ip6info->invflags & IP6T_INV_PROTO) {
173 /* We need match for the '-p all', too! */
174 if ((ip6info->proto != 0) &&
175 !(ip6info->invflags & IP6T_INV_PROTO))
181 /* should be ip6 safe */
183 ip6_checkentry(const struct ip6t_ip6 *ipv6)
185 if (ipv6->flags & ~IP6T_F_MASK) {
186 duprintf("Unknown flag bits set: %08X\n",
187 ipv6->flags & ~IP6T_F_MASK);
190 if (ipv6->invflags & ~IP6T_INV_MASK) {
191 duprintf("Unknown invflag bits set: %08X\n",
192 ipv6->invflags & ~IP6T_INV_MASK);
199 ip6t_error(struct sk_buff *skb,
200 const struct net_device *in,
201 const struct net_device *out,
202 unsigned int hooknum,
203 const struct xt_target *target,
204 const void *targinfo)
207 printk("ip6_tables: error: `%s'\n", (char *)targinfo);
213 bool do_match(struct ip6t_entry_match *m,
214 const struct sk_buff *skb,
215 const struct net_device *in,
216 const struct net_device *out,
218 unsigned int protoff,
221 /* Stop iteration if it doesn't match */
222 if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data,
223 offset, protoff, hotdrop))
229 static inline struct ip6t_entry *
230 get_entry(void *base, unsigned int offset)
232 return (struct ip6t_entry *)(base + offset);
235 /* All zeroes == unconditional rule. */
237 unconditional(const struct ip6t_ip6 *ipv6)
241 for (i = 0; i < sizeof(*ipv6); i++)
242 if (((char *)ipv6)[i])
245 return (i == sizeof(*ipv6));
248 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
249 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
250 /* This cries for unification! */
251 static const char *hooknames[] = {
252 [NF_INET_PRE_ROUTING] = "PREROUTING",
253 [NF_INET_LOCAL_IN] = "INPUT",
254 [NF_INET_FORWARD] = "FORWARD",
255 [NF_INET_LOCAL_OUT] = "OUTPUT",
256 [NF_INET_POST_ROUTING] = "POSTROUTING",
259 enum nf_ip_trace_comments {
260 NF_IP6_TRACE_COMMENT_RULE,
261 NF_IP6_TRACE_COMMENT_RETURN,
262 NF_IP6_TRACE_COMMENT_POLICY,
265 static const char *comments[] = {
266 [NF_IP6_TRACE_COMMENT_RULE] = "rule",
267 [NF_IP6_TRACE_COMMENT_RETURN] = "return",
268 [NF_IP6_TRACE_COMMENT_POLICY] = "policy",
271 static struct nf_loginfo trace_loginfo = {
272 .type = NF_LOG_TYPE_LOG,
276 .logflags = NF_LOG_MASK,
282 get_chainname_rulenum(struct ip6t_entry *s, struct ip6t_entry *e,
283 char *hookname, char **chainname,
284 char **comment, unsigned int *rulenum)
286 struct ip6t_standard_target *t = (void *)ip6t_get_target(s);
288 if (strcmp(t->target.u.kernel.target->name, IP6T_ERROR_TARGET) == 0) {
289 /* Head of user chain: ERROR target with chainname */
290 *chainname = t->target.data;
295 if (s->target_offset == sizeof(struct ip6t_entry)
296 && strcmp(t->target.u.kernel.target->name,
297 IP6T_STANDARD_TARGET) == 0
299 && unconditional(&s->ipv6)) {
300 /* Tail of chains: STANDARD target (return/policy) */
301 *comment = *chainname == hookname
302 ? (char *)comments[NF_IP6_TRACE_COMMENT_POLICY]
303 : (char *)comments[NF_IP6_TRACE_COMMENT_RETURN];
312 static void trace_packet(struct sk_buff *skb,
314 const struct net_device *in,
315 const struct net_device *out,
317 struct xt_table_info *private,
318 struct ip6t_entry *e)
321 struct ip6t_entry *root;
322 char *hookname, *chainname, *comment;
323 unsigned int rulenum = 0;
325 table_base = (void *)private->entries[smp_processor_id()];
326 root = get_entry(table_base, private->hook_entry[hook]);
328 hookname = chainname = (char *)hooknames[hook];
329 comment = (char *)comments[NF_IP6_TRACE_COMMENT_RULE];
331 IP6T_ENTRY_ITERATE(root,
332 private->size - private->hook_entry[hook],
333 get_chainname_rulenum,
334 e, hookname, &chainname, &comment, &rulenum);
336 nf_log_packet(AF_INET6, hook, skb, in, out, &trace_loginfo,
337 "TRACE: %s:%s:%s:%u ",
338 tablename, chainname, comment, rulenum);
342 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
344 ip6t_do_table(struct sk_buff *skb,
346 const struct net_device *in,
347 const struct net_device *out,
348 struct xt_table *table)
350 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
352 unsigned int protoff = 0;
353 bool hotdrop = false;
354 /* Initializing verdict to NF_DROP keeps gcc happy. */
355 unsigned int verdict = NF_DROP;
356 const char *indev, *outdev;
358 struct ip6t_entry *e, *back;
359 struct xt_table_info *private;
362 indev = in ? in->name : nulldevname;
363 outdev = out ? out->name : nulldevname;
364 /* We handle fragments by dealing with the first fragment as
365 * if it was a normal packet. All other fragments are treated
366 * normally, except that they will NEVER match rules that ask
367 * things we don't know, ie. tcp syn flag or ports). If the
368 * rule is also a fragment-specific rule, non-fragments won't
371 read_lock_bh(&table->lock);
372 private = table->private;
373 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
374 table_base = (void *)private->entries[smp_processor_id()];
375 e = get_entry(table_base, private->hook_entry[hook]);
377 /* For return from builtin chain */
378 back = get_entry(table_base, private->underflow[hook]);
383 if (ip6_packet_match(skb, indev, outdev, &e->ipv6,
384 &protoff, &offset, &hotdrop)) {
385 struct ip6t_entry_target *t;
387 if (IP6T_MATCH_ITERATE(e, do_match,
389 offset, protoff, &hotdrop) != 0)
392 ADD_COUNTER(e->counters,
393 ntohs(ipv6_hdr(skb)->payload_len) +
394 sizeof(struct ipv6hdr), 1);
396 t = ip6t_get_target(e);
397 IP_NF_ASSERT(t->u.kernel.target);
399 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
400 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
401 /* The packet is traced: log it */
402 if (unlikely(skb->nf_trace))
403 trace_packet(skb, hook, in, out,
404 table->name, private, e);
406 /* Standard target? */
407 if (!t->u.kernel.target->target) {
410 v = ((struct ip6t_standard_target *)t)->verdict;
412 /* Pop from stack? */
413 if (v != IP6T_RETURN) {
414 verdict = (unsigned)(-v) - 1;
418 back = get_entry(table_base,
422 if (table_base + v != (void *)e + e->next_offset
423 && !(e->ipv6.flags & IP6T_F_GOTO)) {
424 /* Save old back ptr in next entry */
425 struct ip6t_entry *next
426 = (void *)e + e->next_offset;
428 = (void *)back - table_base;
429 /* set back pointer to next entry */
433 e = get_entry(table_base, v);
435 /* Targets which reenter must return
437 #ifdef CONFIG_NETFILTER_DEBUG
438 ((struct ip6t_entry *)table_base)->comefrom
441 verdict = t->u.kernel.target->target(skb,
447 #ifdef CONFIG_NETFILTER_DEBUG
448 if (((struct ip6t_entry *)table_base)->comefrom
450 && verdict == IP6T_CONTINUE) {
451 printk("Target %s reentered!\n",
452 t->u.kernel.target->name);
455 ((struct ip6t_entry *)table_base)->comefrom
458 if (verdict == IP6T_CONTINUE)
459 e = (void *)e + e->next_offset;
467 e = (void *)e + e->next_offset;
471 #ifdef CONFIG_NETFILTER_DEBUG
472 ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON;
474 read_unlock_bh(&table->lock);
476 #ifdef DEBUG_ALLOW_ALL
485 /* Figures out from what hook each rule can be called: returns 0 if
486 there are loops. Puts hook bitmask in comefrom. */
488 mark_source_chains(struct xt_table_info *newinfo,
489 unsigned int valid_hooks, void *entry0)
493 /* No recursion; use packet counter to save back ptrs (reset
494 to 0 as we leave), and comefrom to save source hook bitmask */
495 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
496 unsigned int pos = newinfo->hook_entry[hook];
498 = (struct ip6t_entry *)(entry0 + pos);
499 int visited = e->comefrom & (1 << hook);
501 if (!(valid_hooks & (1 << hook)))
504 /* Set initial back pointer. */
505 e->counters.pcnt = pos;
508 struct ip6t_standard_target *t
509 = (void *)ip6t_get_target(e);
511 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
512 printk("iptables: loop hook %u pos %u %08X.\n",
513 hook, pos, e->comefrom);
517 |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
519 /* Unconditional return/END. */
520 if ((e->target_offset == sizeof(struct ip6t_entry)
521 && (strcmp(t->target.u.user.name,
522 IP6T_STANDARD_TARGET) == 0)
524 && unconditional(&e->ipv6)) || visited) {
525 unsigned int oldpos, size;
527 if (t->verdict < -NF_MAX_VERDICT - 1) {
528 duprintf("mark_source_chains: bad "
529 "negative verdict (%i)\n",
534 /* Return: backtrack through the last
537 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
538 #ifdef DEBUG_IP_FIREWALL_USER
540 & (1 << NF_INET_NUMHOOKS)) {
541 duprintf("Back unset "
548 pos = e->counters.pcnt;
549 e->counters.pcnt = 0;
551 /* We're at the start. */
555 e = (struct ip6t_entry *)
557 } while (oldpos == pos + e->next_offset);
560 size = e->next_offset;
561 e = (struct ip6t_entry *)
562 (entry0 + pos + size);
563 e->counters.pcnt = pos;
566 int newpos = t->verdict;
568 if (strcmp(t->target.u.user.name,
569 IP6T_STANDARD_TARGET) == 0
571 if (newpos > newinfo->size -
572 sizeof(struct ip6t_entry)) {
573 duprintf("mark_source_chains: "
574 "bad verdict (%i)\n",
578 /* This a jump; chase it. */
579 duprintf("Jump rule %u -> %u\n",
582 /* ... this is a fallthru */
583 newpos = pos + e->next_offset;
585 e = (struct ip6t_entry *)
587 e->counters.pcnt = pos;
592 duprintf("Finished chain %u\n", hook);
598 cleanup_match(struct ip6t_entry_match *m, unsigned int *i)
600 if (i && (*i)-- == 0)
603 if (m->u.kernel.match->destroy)
604 m->u.kernel.match->destroy(m->u.kernel.match, m->data);
605 module_put(m->u.kernel.match->me);
610 check_entry(struct ip6t_entry *e, const char *name)
612 struct ip6t_entry_target *t;
614 if (!ip6_checkentry(&e->ipv6)) {
615 duprintf("ip_tables: ip check failed %p %s.\n", e, name);
619 if (e->target_offset + sizeof(struct ip6t_entry_target) >
623 t = ip6t_get_target(e);
624 if (e->target_offset + t->u.target_size > e->next_offset)
630 static inline int check_match(struct ip6t_entry_match *m, const char *name,
631 const struct ip6t_ip6 *ipv6,
632 unsigned int hookmask, unsigned int *i)
634 struct xt_match *match;
637 match = m->u.kernel.match;
638 ret = xt_check_match(match, AF_INET6, m->u.match_size - sizeof(*m),
639 name, hookmask, ipv6->proto,
640 ipv6->invflags & IP6T_INV_PROTO);
641 if (!ret && m->u.kernel.match->checkentry
642 && !m->u.kernel.match->checkentry(name, ipv6, match, m->data,
644 duprintf("ip_tables: check failed for `%s'.\n",
645 m->u.kernel.match->name);
654 find_check_match(struct ip6t_entry_match *m,
656 const struct ip6t_ip6 *ipv6,
657 unsigned int hookmask,
660 struct xt_match *match;
663 match = try_then_request_module(xt_find_match(AF_INET6, m->u.user.name,
665 "ip6t_%s", m->u.user.name);
666 if (IS_ERR(match) || !match) {
667 duprintf("find_check_match: `%s' not found\n", m->u.user.name);
668 return match ? PTR_ERR(match) : -ENOENT;
670 m->u.kernel.match = match;
672 ret = check_match(m, name, ipv6, hookmask, i);
678 module_put(m->u.kernel.match->me);
682 static inline int check_target(struct ip6t_entry *e, const char *name)
684 struct ip6t_entry_target *t;
685 struct xt_target *target;
688 t = ip6t_get_target(e);
689 target = t->u.kernel.target;
690 ret = xt_check_target(target, AF_INET6, t->u.target_size - sizeof(*t),
691 name, e->comefrom, e->ipv6.proto,
692 e->ipv6.invflags & IP6T_INV_PROTO);
693 if (!ret && t->u.kernel.target->checkentry
694 && !t->u.kernel.target->checkentry(name, e, target, t->data,
696 duprintf("ip_tables: check failed for `%s'.\n",
697 t->u.kernel.target->name);
704 find_check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
707 struct ip6t_entry_target *t;
708 struct xt_target *target;
712 ret = check_entry(e, name);
717 ret = IP6T_MATCH_ITERATE(e, find_check_match, name, &e->ipv6,
720 goto cleanup_matches;
722 t = ip6t_get_target(e);
723 target = try_then_request_module(xt_find_target(AF_INET6,
726 "ip6t_%s", t->u.user.name);
727 if (IS_ERR(target) || !target) {
728 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
729 ret = target ? PTR_ERR(target) : -ENOENT;
730 goto cleanup_matches;
732 t->u.kernel.target = target;
734 ret = check_target(e, name);
741 module_put(t->u.kernel.target->me);
743 IP6T_MATCH_ITERATE(e, cleanup_match, &j);
748 check_entry_size_and_hooks(struct ip6t_entry *e,
749 struct xt_table_info *newinfo,
751 unsigned char *limit,
752 const unsigned int *hook_entries,
753 const unsigned int *underflows,
758 if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0
759 || (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
760 duprintf("Bad offset %p\n", e);
765 < sizeof(struct ip6t_entry) + sizeof(struct ip6t_entry_target)) {
766 duprintf("checking: element %p size %u\n",
771 /* Check hooks & underflows */
772 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
773 if ((unsigned char *)e - base == hook_entries[h])
774 newinfo->hook_entry[h] = hook_entries[h];
775 if ((unsigned char *)e - base == underflows[h])
776 newinfo->underflow[h] = underflows[h];
779 /* FIXME: underflows must be unconditional, standard verdicts
780 < 0 (not IP6T_RETURN). --RR */
782 /* Clear counters and comefrom */
783 e->counters = ((struct xt_counters) { 0, 0 });
791 cleanup_entry(struct ip6t_entry *e, unsigned int *i)
793 struct ip6t_entry_target *t;
795 if (i && (*i)-- == 0)
798 /* Cleanup all matches */
799 IP6T_MATCH_ITERATE(e, cleanup_match, NULL);
800 t = ip6t_get_target(e);
801 if (t->u.kernel.target->destroy)
802 t->u.kernel.target->destroy(t->u.kernel.target, t->data);
803 module_put(t->u.kernel.target->me);
807 /* Checks and translates the user-supplied table segment (held in
810 translate_table(const char *name,
811 unsigned int valid_hooks,
812 struct xt_table_info *newinfo,
816 const unsigned int *hook_entries,
817 const unsigned int *underflows)
822 newinfo->size = size;
823 newinfo->number = number;
825 /* Init all hooks to impossible value. */
826 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
827 newinfo->hook_entry[i] = 0xFFFFFFFF;
828 newinfo->underflow[i] = 0xFFFFFFFF;
831 duprintf("translate_table: size %u\n", newinfo->size);
833 /* Walk through entries, checking offsets. */
834 ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size,
835 check_entry_size_and_hooks,
839 hook_entries, underflows, &i);
844 duprintf("translate_table: %u not %u entries\n",
849 /* Check hooks all assigned */
850 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
851 /* Only hooks which are valid */
852 if (!(valid_hooks & (1 << i)))
854 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
855 duprintf("Invalid hook entry %u %u\n",
859 if (newinfo->underflow[i] == 0xFFFFFFFF) {
860 duprintf("Invalid underflow %u %u\n",
866 if (!mark_source_chains(newinfo, valid_hooks, entry0))
869 /* Finally, each sanity check must pass */
871 ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size,
872 find_check_entry, name, size, &i);
875 IP6T_ENTRY_ITERATE(entry0, newinfo->size,
880 /* And one copy for every other CPU */
881 for_each_possible_cpu(i) {
882 if (newinfo->entries[i] && newinfo->entries[i] != entry0)
883 memcpy(newinfo->entries[i], entry0, newinfo->size);
891 add_entry_to_counter(const struct ip6t_entry *e,
892 struct xt_counters total[],
895 ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
902 set_entry_to_counter(const struct ip6t_entry *e,
903 struct ip6t_counters total[],
906 SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
913 get_counters(const struct xt_table_info *t,
914 struct xt_counters counters[])
920 /* Instead of clearing (by a previous call to memset())
921 * the counters and using adds, we set the counters
922 * with data used by 'current' CPU
923 * We dont care about preemption here.
925 curcpu = raw_smp_processor_id();
928 IP6T_ENTRY_ITERATE(t->entries[curcpu],
930 set_entry_to_counter,
934 for_each_possible_cpu(cpu) {
938 IP6T_ENTRY_ITERATE(t->entries[cpu],
940 add_entry_to_counter,
947 copy_entries_to_user(unsigned int total_size,
948 struct xt_table *table,
949 void __user *userptr)
951 unsigned int off, num, countersize;
952 struct ip6t_entry *e;
953 struct xt_counters *counters;
954 struct xt_table_info *private = table->private;
958 /* We need atomic snapshot of counters: rest doesn't change
959 (other than comefrom, which userspace doesn't care
961 countersize = sizeof(struct xt_counters) * private->number;
962 counters = vmalloc_node(countersize, numa_node_id());
964 if (counters == NULL)
967 /* First, sum counters... */
968 write_lock_bh(&table->lock);
969 get_counters(private, counters);
970 write_unlock_bh(&table->lock);
972 /* choose the copy that is on ourc node/cpu */
973 loc_cpu_entry = private->entries[raw_smp_processor_id()];
974 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
979 /* FIXME: use iterator macros --RR */
980 /* ... then go back and fix counters and names */
981 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
983 struct ip6t_entry_match *m;
984 struct ip6t_entry_target *t;
986 e = (struct ip6t_entry *)(loc_cpu_entry + off);
987 if (copy_to_user(userptr + off
988 + offsetof(struct ip6t_entry, counters),
990 sizeof(counters[num])) != 0) {
995 for (i = sizeof(struct ip6t_entry);
996 i < e->target_offset;
997 i += m->u.match_size) {
1000 if (copy_to_user(userptr + off + i
1001 + offsetof(struct ip6t_entry_match,
1003 m->u.kernel.match->name,
1004 strlen(m->u.kernel.match->name)+1)
1011 t = ip6t_get_target(e);
1012 if (copy_to_user(userptr + off + e->target_offset
1013 + offsetof(struct ip6t_entry_target,
1015 t->u.kernel.target->name,
1016 strlen(t->u.kernel.target->name)+1) != 0) {
1028 get_entries(const struct ip6t_get_entries *entries,
1029 struct ip6t_get_entries __user *uptr)
1034 t = xt_find_table_lock(AF_INET6, entries->name);
1035 if (t && !IS_ERR(t)) {
1036 struct xt_table_info *private = t->private;
1037 duprintf("t->private->number = %u\n", private->number);
1038 if (entries->size == private->size)
1039 ret = copy_entries_to_user(private->size,
1040 t, uptr->entrytable);
1042 duprintf("get_entries: I've got %u not %u!\n",
1043 private->size, entries->size);
1049 ret = t ? PTR_ERR(t) : -ENOENT;
1055 do_replace(void __user *user, unsigned int len)
1058 struct ip6t_replace tmp;
1060 struct xt_table_info *newinfo, *oldinfo;
1061 struct xt_counters *counters;
1062 void *loc_cpu_entry, *loc_cpu_old_entry;
1064 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1067 /* overflow check */
1068 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1071 newinfo = xt_alloc_table_info(tmp.size);
1075 /* choose the copy that is on our node/cpu */
1076 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1077 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1083 counters = vmalloc_node(tmp.num_counters * sizeof(struct xt_counters),
1090 ret = translate_table(tmp.name, tmp.valid_hooks,
1091 newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
1092 tmp.hook_entry, tmp.underflow);
1094 goto free_newinfo_counters;
1096 duprintf("ip_tables: Translated table\n");
1098 t = try_then_request_module(xt_find_table_lock(AF_INET6, tmp.name),
1099 "ip6table_%s", tmp.name);
1100 if (!t || IS_ERR(t)) {
1101 ret = t ? PTR_ERR(t) : -ENOENT;
1102 goto free_newinfo_counters_untrans;
1106 if (tmp.valid_hooks != t->valid_hooks) {
1107 duprintf("Valid hook crap: %08X vs %08X\n",
1108 tmp.valid_hooks, t->valid_hooks);
1113 oldinfo = xt_replace_table(t, tmp.num_counters, newinfo, &ret);
1117 /* Update module usage count based on number of rules */
1118 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1119 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1120 if ((oldinfo->number > oldinfo->initial_entries) ||
1121 (newinfo->number <= oldinfo->initial_entries))
1123 if ((oldinfo->number > oldinfo->initial_entries) &&
1124 (newinfo->number <= oldinfo->initial_entries))
1127 /* Get the old counters. */
1128 get_counters(oldinfo, counters);
1129 /* Decrease module usage counts and free resource */
1130 loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
1131 IP6T_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL);
1132 xt_free_table_info(oldinfo);
1133 if (copy_to_user(tmp.counters, counters,
1134 sizeof(struct xt_counters) * tmp.num_counters) != 0)
1143 free_newinfo_counters_untrans:
1144 IP6T_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
1145 free_newinfo_counters:
1148 xt_free_table_info(newinfo);
1152 /* We're lazy, and add to the first CPU; overflow works its fey magic
1153 * and everything is OK. */
1155 add_counter_to_entry(struct ip6t_entry *e,
1156 const struct xt_counters addme[],
1160 duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n",
1162 (long unsigned int)e->counters.pcnt,
1163 (long unsigned int)e->counters.bcnt,
1164 (long unsigned int)addme[*i].pcnt,
1165 (long unsigned int)addme[*i].bcnt);
1168 ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
1175 do_add_counters(void __user *user, unsigned int len)
1178 struct xt_counters_info tmp, *paddc;
1179 struct xt_table_info *private;
1182 void *loc_cpu_entry;
1184 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1187 if (len != sizeof(tmp) + tmp.num_counters*sizeof(struct xt_counters))
1190 paddc = vmalloc_node(len, numa_node_id());
1194 if (copy_from_user(paddc, user, len) != 0) {
1199 t = xt_find_table_lock(AF_INET6, tmp.name);
1200 if (!t || IS_ERR(t)) {
1201 ret = t ? PTR_ERR(t) : -ENOENT;
1205 write_lock_bh(&t->lock);
1206 private = t->private;
1207 if (private->number != tmp.num_counters) {
1209 goto unlock_up_free;
1213 /* Choose the copy that is on our node */
1214 loc_cpu_entry = private->entries[smp_processor_id()];
1215 IP6T_ENTRY_ITERATE(loc_cpu_entry,
1217 add_counter_to_entry,
1221 write_unlock_bh(&t->lock);
1231 do_ip6t_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1235 if (!capable(CAP_NET_ADMIN))
1239 case IP6T_SO_SET_REPLACE:
1240 ret = do_replace(user, len);
1243 case IP6T_SO_SET_ADD_COUNTERS:
1244 ret = do_add_counters(user, len);
1248 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd);
1256 do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1260 if (!capable(CAP_NET_ADMIN))
1264 case IP6T_SO_GET_INFO: {
1265 char name[IP6T_TABLE_MAXNAMELEN];
1268 if (*len != sizeof(struct ip6t_getinfo)) {
1269 duprintf("length %u != %u\n", *len,
1270 sizeof(struct ip6t_getinfo));
1275 if (copy_from_user(name, user, sizeof(name)) != 0) {
1279 name[IP6T_TABLE_MAXNAMELEN-1] = '\0';
1281 t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
1282 "ip6table_%s", name);
1283 if (t && !IS_ERR(t)) {
1284 struct ip6t_getinfo info;
1285 struct xt_table_info *private = t->private;
1287 info.valid_hooks = t->valid_hooks;
1288 memcpy(info.hook_entry, private->hook_entry,
1289 sizeof(info.hook_entry));
1290 memcpy(info.underflow, private->underflow,
1291 sizeof(info.underflow));
1292 info.num_entries = private->number;
1293 info.size = private->size;
1294 memcpy(info.name, name, sizeof(info.name));
1296 if (copy_to_user(user, &info, *len) != 0)
1303 ret = t ? PTR_ERR(t) : -ENOENT;
1307 case IP6T_SO_GET_ENTRIES: {
1308 struct ip6t_get_entries get;
1310 if (*len < sizeof(get)) {
1311 duprintf("get_entries: %u < %u\n", *len, sizeof(get));
1313 } else if (copy_from_user(&get, user, sizeof(get)) != 0) {
1315 } else if (*len != sizeof(struct ip6t_get_entries) + get.size) {
1316 duprintf("get_entries: %u != %u\n", *len,
1317 sizeof(struct ip6t_get_entries) + get.size);
1320 ret = get_entries(&get, user);
1324 case IP6T_SO_GET_REVISION_MATCH:
1325 case IP6T_SO_GET_REVISION_TARGET: {
1326 struct ip6t_get_revision rev;
1329 if (*len != sizeof(rev)) {
1333 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1338 if (cmd == IP6T_SO_GET_REVISION_TARGET)
1343 try_then_request_module(xt_find_revision(AF_INET6, rev.name,
1346 "ip6t_%s", rev.name);
1351 duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd);
1358 int ip6t_register_table(struct xt_table *table,
1359 const struct ip6t_replace *repl)
1362 struct xt_table_info *newinfo;
1363 struct xt_table_info bootstrap
1364 = { 0, 0, 0, { 0 }, { 0 }, { } };
1365 void *loc_cpu_entry;
1367 newinfo = xt_alloc_table_info(repl->size);
1371 /* choose the copy on our node/cpu */
1372 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1373 memcpy(loc_cpu_entry, repl->entries, repl->size);
1375 ret = translate_table(table->name, table->valid_hooks,
1376 newinfo, loc_cpu_entry, repl->size,
1381 xt_free_table_info(newinfo);
1385 ret = xt_register_table(table, &bootstrap, newinfo);
1387 xt_free_table_info(newinfo);
1394 void ip6t_unregister_table(struct xt_table *table)
1396 struct xt_table_info *private;
1397 void *loc_cpu_entry;
1399 private = xt_unregister_table(table);
1401 /* Decrease module usage counts and free resources */
1402 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1403 IP6T_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL);
1404 xt_free_table_info(private);
1407 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
1409 icmp6_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
1410 u_int8_t type, u_int8_t code,
1413 return (type == test_type && code >= min_code && code <= max_code)
1418 icmp6_match(const struct sk_buff *skb,
1419 const struct net_device *in,
1420 const struct net_device *out,
1421 const struct xt_match *match,
1422 const void *matchinfo,
1424 unsigned int protoff,
1427 struct icmp6hdr _icmp, *ic;
1428 const struct ip6t_icmp *icmpinfo = matchinfo;
1430 /* Must not be a fragment. */
1434 ic = skb_header_pointer(skb, protoff, sizeof(_icmp), &_icmp);
1436 /* We've been asked to examine this packet, and we
1437 can't. Hence, no choice but to drop. */
1438 duprintf("Dropping evil ICMP tinygram.\n");
1443 return icmp6_type_code_match(icmpinfo->type,
1446 ic->icmp6_type, ic->icmp6_code,
1447 !!(icmpinfo->invflags&IP6T_ICMP_INV));
1450 /* Called when user tries to insert an entry of this type. */
1452 icmp6_checkentry(const char *tablename,
1454 const struct xt_match *match,
1456 unsigned int hook_mask)
1458 const struct ip6t_icmp *icmpinfo = matchinfo;
1460 /* Must specify no unknown invflags */
1461 return !(icmpinfo->invflags & ~IP6T_ICMP_INV);
1464 /* The built-in targets: standard (NULL) and error. */
1465 static struct xt_target ip6t_standard_target __read_mostly = {
1466 .name = IP6T_STANDARD_TARGET,
1467 .targetsize = sizeof(int),
1471 static struct xt_target ip6t_error_target __read_mostly = {
1472 .name = IP6T_ERROR_TARGET,
1473 .target = ip6t_error,
1474 .targetsize = IP6T_FUNCTION_MAXNAMELEN,
1478 static struct nf_sockopt_ops ip6t_sockopts = {
1480 .set_optmin = IP6T_BASE_CTL,
1481 .set_optmax = IP6T_SO_SET_MAX+1,
1482 .set = do_ip6t_set_ctl,
1483 .get_optmin = IP6T_BASE_CTL,
1484 .get_optmax = IP6T_SO_GET_MAX+1,
1485 .get = do_ip6t_get_ctl,
1486 .owner = THIS_MODULE,
1489 static struct xt_match icmp6_matchstruct __read_mostly = {
1491 .match = &icmp6_match,
1492 .matchsize = sizeof(struct ip6t_icmp),
1493 .checkentry = icmp6_checkentry,
1494 .proto = IPPROTO_ICMPV6,
1498 static int __init ip6_tables_init(void)
1502 ret = xt_proto_init(AF_INET6);
1506 /* Noone else will be downing sem now, so we won't sleep */
1507 ret = xt_register_target(&ip6t_standard_target);
1510 ret = xt_register_target(&ip6t_error_target);
1513 ret = xt_register_match(&icmp6_matchstruct);
1517 /* Register setsockopt */
1518 ret = nf_register_sockopt(&ip6t_sockopts);
1522 printk(KERN_INFO "ip6_tables: (C) 2000-2006 Netfilter Core Team\n");
1526 xt_unregister_match(&icmp6_matchstruct);
1528 xt_unregister_target(&ip6t_error_target);
1530 xt_unregister_target(&ip6t_standard_target);
1532 xt_proto_fini(AF_INET6);
1537 static void __exit ip6_tables_fini(void)
1539 nf_unregister_sockopt(&ip6t_sockopts);
1540 xt_unregister_match(&icmp6_matchstruct);
1541 xt_unregister_target(&ip6t_error_target);
1542 xt_unregister_target(&ip6t_standard_target);
1543 xt_proto_fini(AF_INET6);
1547 * find the offset to specified header or the protocol number of last header
1548 * if target < 0. "last header" is transport protocol header, ESP, or
1551 * If target header is found, its offset is set in *offset and return protocol
1552 * number. Otherwise, return -1.
1554 * If the first fragment doesn't contain the final protocol header or
1555 * NEXTHDR_NONE it is considered invalid.
1557 * Note that non-1st fragment is special case that "the protocol number
1558 * of last header" is "next header" field in Fragment header. In this case,
1559 * *offset is meaningless and fragment offset is stored in *fragoff if fragoff
1563 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
1564 int target, unsigned short *fragoff)
1566 unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
1567 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
1568 unsigned int len = skb->len - start;
1573 while (nexthdr != target) {
1574 struct ipv6_opt_hdr _hdr, *hp;
1575 unsigned int hdrlen;
1577 if ((!ipv6_ext_hdr(nexthdr)) || nexthdr == NEXTHDR_NONE) {
1583 hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
1586 if (nexthdr == NEXTHDR_FRAGMENT) {
1587 unsigned short _frag_off;
1589 fp = skb_header_pointer(skb,
1590 start+offsetof(struct frag_hdr,
1597 _frag_off = ntohs(*fp) & ~0x7;
1600 ((!ipv6_ext_hdr(hp->nexthdr)) ||
1601 hp->nexthdr == NEXTHDR_NONE)) {
1603 *fragoff = _frag_off;
1609 } else if (nexthdr == NEXTHDR_AUTH)
1610 hdrlen = (hp->hdrlen + 2) << 2;
1612 hdrlen = ipv6_optlen(hp);
1614 nexthdr = hp->nexthdr;
1623 EXPORT_SYMBOL(ip6t_register_table);
1624 EXPORT_SYMBOL(ip6t_unregister_table);
1625 EXPORT_SYMBOL(ip6t_do_table);
1626 EXPORT_SYMBOL(ip6t_ext_hdr);
1627 EXPORT_SYMBOL(ipv6_find_hdr);
1629 module_init(ip6_tables_init);
1630 module_exit(ip6_tables_fini);