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 #include <linux/cache.h>
12 #include <linux/capability.h>
13 #include <linux/skbuff.h>
14 #include <linux/kmod.h>
15 #include <linux/vmalloc.h>
16 #include <linux/netdevice.h>
17 #include <linux/module.h>
18 #include <linux/icmp.h>
20 #include <net/compat.h>
21 #include <asm/uaccess.h>
22 #include <linux/mutex.h>
23 #include <linux/proc_fs.h>
24 #include <linux/err.h>
25 #include <linux/cpumask.h>
27 #include <linux/netfilter/x_tables.h>
28 #include <linux/netfilter_ipv4/ip_tables.h>
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
32 MODULE_DESCRIPTION("IPv4 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 /* Returns whether matches rule or not. */
78 ip_packet_match(const struct iphdr *ip,
81 const struct ipt_ip *ipinfo,
87 #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
89 if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
91 || FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
93 dprintf("Source or dest mismatch.\n");
95 dprintf("SRC: %u.%u.%u.%u. Mask: %u.%u.%u.%u. Target: %u.%u.%u.%u.%s\n",
97 NIPQUAD(ipinfo->smsk.s_addr),
98 NIPQUAD(ipinfo->src.s_addr),
99 ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : "");
100 dprintf("DST: %u.%u.%u.%u Mask: %u.%u.%u.%u Target: %u.%u.%u.%u.%s\n",
102 NIPQUAD(ipinfo->dmsk.s_addr),
103 NIPQUAD(ipinfo->dst.s_addr),
104 ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : "");
108 /* Look for ifname matches; this should unroll nicely. */
109 for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
110 ret |= (((const unsigned long *)indev)[i]
111 ^ ((const unsigned long *)ipinfo->iniface)[i])
112 & ((const unsigned long *)ipinfo->iniface_mask)[i];
115 if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
116 dprintf("VIA in mismatch (%s vs %s).%s\n",
117 indev, ipinfo->iniface,
118 ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
122 for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
123 ret |= (((const unsigned long *)outdev)[i]
124 ^ ((const unsigned long *)ipinfo->outiface)[i])
125 & ((const unsigned long *)ipinfo->outiface_mask)[i];
128 if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
129 dprintf("VIA out mismatch (%s vs %s).%s\n",
130 outdev, ipinfo->outiface,
131 ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
135 /* Check specific protocol */
137 && FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) {
138 dprintf("Packet protocol %hi does not match %hi.%s\n",
139 ip->protocol, ipinfo->proto,
140 ipinfo->invflags&IPT_INV_PROTO ? " (INV)":"");
144 /* If we have a fragment rule but the packet is not a fragment
145 * then we return zero */
146 if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) {
147 dprintf("Fragment rule but not fragment.%s\n",
148 ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : "");
156 ip_checkentry(const struct ipt_ip *ip)
158 if (ip->flags & ~IPT_F_MASK) {
159 duprintf("Unknown flag bits set: %08X\n",
160 ip->flags & ~IPT_F_MASK);
163 if (ip->invflags & ~IPT_INV_MASK) {
164 duprintf("Unknown invflag bits set: %08X\n",
165 ip->invflags & ~IPT_INV_MASK);
172 ipt_error(struct sk_buff *skb,
173 const struct net_device *in,
174 const struct net_device *out,
175 unsigned int hooknum,
176 const struct xt_target *target,
177 const void *targinfo)
180 printk("ip_tables: error: `%s'\n", (char *)targinfo);
186 bool do_match(struct ipt_entry_match *m,
187 const struct sk_buff *skb,
188 const struct net_device *in,
189 const struct net_device *out,
193 /* Stop iteration if it doesn't match */
194 if (!m->u.kernel.match->match(skb, in, out, m->u.kernel.match, m->data,
195 offset, ip_hdrlen(skb), hotdrop))
201 static inline struct ipt_entry *
202 get_entry(void *base, unsigned int offset)
204 return (struct ipt_entry *)(base + offset);
207 /* All zeroes == unconditional rule. */
209 unconditional(const struct ipt_ip *ip)
213 for (i = 0; i < sizeof(*ip)/sizeof(__u32); i++)
214 if (((__u32 *)ip)[i])
220 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
221 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
222 static const char *hooknames[] = {
223 [NF_INET_PRE_ROUTING] = "PREROUTING",
224 [NF_INET_LOCAL_IN] = "INPUT",
225 [NF_INET_FORWARD] = "FORWARD",
226 [NF_INET_LOCAL_OUT] = "OUTPUT",
227 [NF_INET_POST_ROUTING] = "POSTROUTING",
230 enum nf_ip_trace_comments {
231 NF_IP_TRACE_COMMENT_RULE,
232 NF_IP_TRACE_COMMENT_RETURN,
233 NF_IP_TRACE_COMMENT_POLICY,
236 static const char *comments[] = {
237 [NF_IP_TRACE_COMMENT_RULE] = "rule",
238 [NF_IP_TRACE_COMMENT_RETURN] = "return",
239 [NF_IP_TRACE_COMMENT_POLICY] = "policy",
242 static struct nf_loginfo trace_loginfo = {
243 .type = NF_LOG_TYPE_LOG,
247 .logflags = NF_LOG_MASK,
253 get_chainname_rulenum(struct ipt_entry *s, struct ipt_entry *e,
254 char *hookname, char **chainname,
255 char **comment, unsigned int *rulenum)
257 struct ipt_standard_target *t = (void *)ipt_get_target(s);
259 if (strcmp(t->target.u.kernel.target->name, IPT_ERROR_TARGET) == 0) {
260 /* Head of user chain: ERROR target with chainname */
261 *chainname = t->target.data;
266 if (s->target_offset == sizeof(struct ipt_entry)
267 && strcmp(t->target.u.kernel.target->name,
268 IPT_STANDARD_TARGET) == 0
270 && unconditional(&s->ip)) {
271 /* Tail of chains: STANDARD target (return/policy) */
272 *comment = *chainname == hookname
273 ? (char *)comments[NF_IP_TRACE_COMMENT_POLICY]
274 : (char *)comments[NF_IP_TRACE_COMMENT_RETURN];
283 static void trace_packet(struct sk_buff *skb,
285 const struct net_device *in,
286 const struct net_device *out,
288 struct xt_table_info *private,
292 struct ipt_entry *root;
293 char *hookname, *chainname, *comment;
294 unsigned int rulenum = 0;
296 table_base = (void *)private->entries[smp_processor_id()];
297 root = get_entry(table_base, private->hook_entry[hook]);
299 hookname = chainname = (char *)hooknames[hook];
300 comment = (char *)comments[NF_IP_TRACE_COMMENT_RULE];
302 IPT_ENTRY_ITERATE(root,
303 private->size - private->hook_entry[hook],
304 get_chainname_rulenum,
305 e, hookname, &chainname, &comment, &rulenum);
307 nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo,
308 "TRACE: %s:%s:%s:%u ",
309 tablename, chainname, comment, rulenum);
313 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
315 ipt_do_table(struct sk_buff *skb,
317 const struct net_device *in,
318 const struct net_device *out,
319 struct xt_table *table)
321 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
325 bool hotdrop = false;
326 /* Initializing verdict to NF_DROP keeps gcc happy. */
327 unsigned int verdict = NF_DROP;
328 const char *indev, *outdev;
330 struct ipt_entry *e, *back;
331 struct xt_table_info *private;
335 datalen = skb->len - ip->ihl * 4;
336 indev = in ? in->name : nulldevname;
337 outdev = out ? out->name : nulldevname;
338 /* We handle fragments by dealing with the first fragment as
339 * if it was a normal packet. All other fragments are treated
340 * normally, except that they will NEVER match rules that ask
341 * things we don't know, ie. tcp syn flag or ports). If the
342 * rule is also a fragment-specific rule, non-fragments won't
344 offset = ntohs(ip->frag_off) & IP_OFFSET;
346 read_lock_bh(&table->lock);
347 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
348 private = table->private;
349 table_base = (void *)private->entries[smp_processor_id()];
350 e = get_entry(table_base, private->hook_entry[hook]);
352 /* For return from builtin chain */
353 back = get_entry(table_base, private->underflow[hook]);
358 if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
359 struct ipt_entry_target *t;
361 if (IPT_MATCH_ITERATE(e, do_match,
363 offset, &hotdrop) != 0)
366 ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
368 t = ipt_get_target(e);
369 IP_NF_ASSERT(t->u.kernel.target);
371 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
372 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
373 /* The packet is traced: log it */
374 if (unlikely(skb->nf_trace))
375 trace_packet(skb, hook, in, out,
376 table->name, private, e);
378 /* Standard target? */
379 if (!t->u.kernel.target->target) {
382 v = ((struct ipt_standard_target *)t)->verdict;
384 /* Pop from stack? */
385 if (v != IPT_RETURN) {
386 verdict = (unsigned)(-v) - 1;
390 back = get_entry(table_base,
394 if (table_base + v != (void *)e + e->next_offset
395 && !(e->ip.flags & IPT_F_GOTO)) {
396 /* Save old back ptr in next entry */
397 struct ipt_entry *next
398 = (void *)e + e->next_offset;
400 = (void *)back - table_base;
401 /* set back pointer to next entry */
405 e = get_entry(table_base, v);
407 /* Targets which reenter must return
409 #ifdef CONFIG_NETFILTER_DEBUG
410 ((struct ipt_entry *)table_base)->comefrom
413 verdict = t->u.kernel.target->target(skb,
419 #ifdef CONFIG_NETFILTER_DEBUG
420 if (((struct ipt_entry *)table_base)->comefrom
422 && verdict == IPT_CONTINUE) {
423 printk("Target %s reentered!\n",
424 t->u.kernel.target->name);
427 ((struct ipt_entry *)table_base)->comefrom
430 /* Target might have changed stuff. */
432 datalen = skb->len - ip->ihl * 4;
434 if (verdict == IPT_CONTINUE)
435 e = (void *)e + e->next_offset;
443 e = (void *)e + e->next_offset;
447 read_unlock_bh(&table->lock);
449 #ifdef DEBUG_ALLOW_ALL
458 /* Figures out from what hook each rule can be called: returns 0 if
459 there are loops. Puts hook bitmask in comefrom. */
461 mark_source_chains(struct xt_table_info *newinfo,
462 unsigned int valid_hooks, void *entry0)
466 /* No recursion; use packet counter to save back ptrs (reset
467 to 0 as we leave), and comefrom to save source hook bitmask */
468 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
469 unsigned int pos = newinfo->hook_entry[hook];
471 = (struct ipt_entry *)(entry0 + pos);
473 if (!(valid_hooks & (1 << hook)))
476 /* Set initial back pointer. */
477 e->counters.pcnt = pos;
480 struct ipt_standard_target *t
481 = (void *)ipt_get_target(e);
482 int visited = e->comefrom & (1 << hook);
484 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
485 printk("iptables: loop hook %u pos %u %08X.\n",
486 hook, pos, e->comefrom);
490 |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
492 /* Unconditional return/END. */
493 if ((e->target_offset == sizeof(struct ipt_entry)
494 && (strcmp(t->target.u.user.name,
495 IPT_STANDARD_TARGET) == 0)
497 && unconditional(&e->ip)) || visited) {
498 unsigned int oldpos, size;
500 if (t->verdict < -NF_MAX_VERDICT - 1) {
501 duprintf("mark_source_chains: bad "
502 "negative verdict (%i)\n",
507 /* Return: backtrack through the last
510 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
511 #ifdef DEBUG_IP_FIREWALL_USER
513 & (1 << NF_INET_NUMHOOKS)) {
514 duprintf("Back unset "
521 pos = e->counters.pcnt;
522 e->counters.pcnt = 0;
524 /* We're at the start. */
528 e = (struct ipt_entry *)
530 } while (oldpos == pos + e->next_offset);
533 size = e->next_offset;
534 e = (struct ipt_entry *)
535 (entry0 + pos + size);
536 e->counters.pcnt = pos;
539 int newpos = t->verdict;
541 if (strcmp(t->target.u.user.name,
542 IPT_STANDARD_TARGET) == 0
544 if (newpos > newinfo->size -
545 sizeof(struct ipt_entry)) {
546 duprintf("mark_source_chains: "
547 "bad verdict (%i)\n",
551 /* This a jump; chase it. */
552 duprintf("Jump rule %u -> %u\n",
555 /* ... this is a fallthru */
556 newpos = pos + e->next_offset;
558 e = (struct ipt_entry *)
560 e->counters.pcnt = pos;
565 duprintf("Finished chain %u\n", hook);
571 cleanup_match(struct ipt_entry_match *m, unsigned int *i)
573 if (i && (*i)-- == 0)
576 if (m->u.kernel.match->destroy)
577 m->u.kernel.match->destroy(m->u.kernel.match, m->data);
578 module_put(m->u.kernel.match->me);
583 check_entry(struct ipt_entry *e, const char *name)
585 struct ipt_entry_target *t;
587 if (!ip_checkentry(&e->ip)) {
588 duprintf("ip_tables: ip check failed %p %s.\n", e, name);
592 if (e->target_offset + sizeof(struct ipt_entry_target) > e->next_offset)
595 t = ipt_get_target(e);
596 if (e->target_offset + t->u.target_size > e->next_offset)
602 static inline int check_match(struct ipt_entry_match *m, const char *name,
603 const struct ipt_ip *ip, unsigned int hookmask,
606 struct xt_match *match;
609 match = m->u.kernel.match;
610 ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m),
611 name, hookmask, ip->proto,
612 ip->invflags & IPT_INV_PROTO);
613 if (!ret && m->u.kernel.match->checkentry
614 && !m->u.kernel.match->checkentry(name, ip, match, m->data,
616 duprintf("ip_tables: check failed for `%s'.\n",
617 m->u.kernel.match->name);
626 find_check_match(struct ipt_entry_match *m,
628 const struct ipt_ip *ip,
629 unsigned int hookmask,
632 struct xt_match *match;
635 match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name,
637 "ipt_%s", m->u.user.name);
638 if (IS_ERR(match) || !match) {
639 duprintf("find_check_match: `%s' not found\n", m->u.user.name);
640 return match ? PTR_ERR(match) : -ENOENT;
642 m->u.kernel.match = match;
644 ret = check_match(m, name, ip, hookmask, i);
650 module_put(m->u.kernel.match->me);
654 static inline int check_target(struct ipt_entry *e, const char *name)
656 struct ipt_entry_target *t;
657 struct xt_target *target;
660 t = ipt_get_target(e);
661 target = t->u.kernel.target;
662 ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
663 name, e->comefrom, e->ip.proto,
664 e->ip.invflags & IPT_INV_PROTO);
665 if (!ret && t->u.kernel.target->checkentry
666 && !t->u.kernel.target->checkentry(name, e, target,
667 t->data, e->comefrom)) {
668 duprintf("ip_tables: check failed for `%s'.\n",
669 t->u.kernel.target->name);
676 find_check_entry(struct ipt_entry *e, const char *name, unsigned int size,
679 struct ipt_entry_target *t;
680 struct xt_target *target;
684 ret = check_entry(e, name);
689 ret = IPT_MATCH_ITERATE(e, find_check_match, name, &e->ip,
692 goto cleanup_matches;
694 t = ipt_get_target(e);
695 target = try_then_request_module(xt_find_target(AF_INET,
698 "ipt_%s", t->u.user.name);
699 if (IS_ERR(target) || !target) {
700 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
701 ret = target ? PTR_ERR(target) : -ENOENT;
702 goto cleanup_matches;
704 t->u.kernel.target = target;
706 ret = check_target(e, name);
713 module_put(t->u.kernel.target->me);
715 IPT_MATCH_ITERATE(e, cleanup_match, &j);
720 check_entry_size_and_hooks(struct ipt_entry *e,
721 struct xt_table_info *newinfo,
723 unsigned char *limit,
724 const unsigned int *hook_entries,
725 const unsigned int *underflows,
730 if ((unsigned long)e % __alignof__(struct ipt_entry) != 0
731 || (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
732 duprintf("Bad offset %p\n", e);
737 < sizeof(struct ipt_entry) + sizeof(struct ipt_entry_target)) {
738 duprintf("checking: element %p size %u\n",
743 /* Check hooks & underflows */
744 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
745 if ((unsigned char *)e - base == hook_entries[h])
746 newinfo->hook_entry[h] = hook_entries[h];
747 if ((unsigned char *)e - base == underflows[h])
748 newinfo->underflow[h] = underflows[h];
751 /* FIXME: underflows must be unconditional, standard verdicts
752 < 0 (not IPT_RETURN). --RR */
754 /* Clear counters and comefrom */
755 e->counters = ((struct xt_counters) { 0, 0 });
763 cleanup_entry(struct ipt_entry *e, unsigned int *i)
765 struct ipt_entry_target *t;
767 if (i && (*i)-- == 0)
770 /* Cleanup all matches */
771 IPT_MATCH_ITERATE(e, cleanup_match, NULL);
772 t = ipt_get_target(e);
773 if (t->u.kernel.target->destroy)
774 t->u.kernel.target->destroy(t->u.kernel.target, t->data);
775 module_put(t->u.kernel.target->me);
779 /* Checks and translates the user-supplied table segment (held in
782 translate_table(const char *name,
783 unsigned int valid_hooks,
784 struct xt_table_info *newinfo,
788 const unsigned int *hook_entries,
789 const unsigned int *underflows)
794 newinfo->size = size;
795 newinfo->number = number;
797 /* Init all hooks to impossible value. */
798 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
799 newinfo->hook_entry[i] = 0xFFFFFFFF;
800 newinfo->underflow[i] = 0xFFFFFFFF;
803 duprintf("translate_table: size %u\n", newinfo->size);
805 /* Walk through entries, checking offsets. */
806 ret = IPT_ENTRY_ITERATE(entry0, newinfo->size,
807 check_entry_size_and_hooks,
811 hook_entries, underflows, &i);
816 duprintf("translate_table: %u not %u entries\n",
821 /* Check hooks all assigned */
822 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
823 /* Only hooks which are valid */
824 if (!(valid_hooks & (1 << i)))
826 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
827 duprintf("Invalid hook entry %u %u\n",
831 if (newinfo->underflow[i] == 0xFFFFFFFF) {
832 duprintf("Invalid underflow %u %u\n",
838 if (!mark_source_chains(newinfo, valid_hooks, entry0))
841 /* Finally, each sanity check must pass */
843 ret = IPT_ENTRY_ITERATE(entry0, newinfo->size,
844 find_check_entry, name, size, &i);
847 IPT_ENTRY_ITERATE(entry0, newinfo->size,
852 /* And one copy for every other CPU */
853 for_each_possible_cpu(i) {
854 if (newinfo->entries[i] && newinfo->entries[i] != entry0)
855 memcpy(newinfo->entries[i], entry0, newinfo->size);
863 add_entry_to_counter(const struct ipt_entry *e,
864 struct xt_counters total[],
867 ADD_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
874 set_entry_to_counter(const struct ipt_entry *e,
875 struct ipt_counters total[],
878 SET_COUNTER(total[*i], e->counters.bcnt, e->counters.pcnt);
885 get_counters(const struct xt_table_info *t,
886 struct xt_counters counters[])
892 /* Instead of clearing (by a previous call to memset())
893 * the counters and using adds, we set the counters
894 * with data used by 'current' CPU
895 * We dont care about preemption here.
897 curcpu = raw_smp_processor_id();
900 IPT_ENTRY_ITERATE(t->entries[curcpu],
902 set_entry_to_counter,
906 for_each_possible_cpu(cpu) {
910 IPT_ENTRY_ITERATE(t->entries[cpu],
912 add_entry_to_counter,
918 static inline struct xt_counters * alloc_counters(struct xt_table *table)
920 unsigned int countersize;
921 struct xt_counters *counters;
922 struct xt_table_info *private = table->private;
924 /* We need atomic snapshot of counters: rest doesn't change
925 (other than comefrom, which userspace doesn't care
927 countersize = sizeof(struct xt_counters) * private->number;
928 counters = vmalloc_node(countersize, numa_node_id());
930 if (counters == NULL)
931 return ERR_PTR(-ENOMEM);
933 /* First, sum counters... */
934 write_lock_bh(&table->lock);
935 get_counters(private, counters);
936 write_unlock_bh(&table->lock);
942 copy_entries_to_user(unsigned int total_size,
943 struct xt_table *table,
944 void __user *userptr)
946 unsigned int off, num;
948 struct xt_counters *counters;
949 struct xt_table_info *private = table->private;
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 /* ... then copy entire thing ... */
963 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
968 /* FIXME: use iterator macros --RR */
969 /* ... then go back and fix counters and names */
970 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
972 struct ipt_entry_match *m;
973 struct ipt_entry_target *t;
975 e = (struct ipt_entry *)(loc_cpu_entry + off);
976 if (copy_to_user(userptr + off
977 + offsetof(struct ipt_entry, counters),
979 sizeof(counters[num])) != 0) {
984 for (i = sizeof(struct ipt_entry);
985 i < e->target_offset;
986 i += m->u.match_size) {
989 if (copy_to_user(userptr + off + i
990 + offsetof(struct ipt_entry_match,
992 m->u.kernel.match->name,
993 strlen(m->u.kernel.match->name)+1)
1000 t = ipt_get_target(e);
1001 if (copy_to_user(userptr + off + e->target_offset
1002 + offsetof(struct ipt_entry_target,
1004 t->u.kernel.target->name,
1005 strlen(t->u.kernel.target->name)+1) != 0) {
1016 #ifdef CONFIG_COMPAT
1017 struct compat_delta {
1018 struct compat_delta *next;
1019 unsigned int offset;
1023 static struct compat_delta *compat_offsets = NULL;
1025 static int compat_add_offset(unsigned int offset, short delta)
1027 struct compat_delta *tmp;
1029 tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL);
1032 tmp->offset = offset;
1034 if (compat_offsets) {
1035 tmp->next = compat_offsets->next;
1036 compat_offsets->next = tmp;
1038 compat_offsets = tmp;
1044 static void compat_flush_offsets(void)
1046 struct compat_delta *tmp, *next;
1048 if (compat_offsets) {
1049 for(tmp = compat_offsets; tmp; tmp = next) {
1053 compat_offsets = NULL;
1057 static short compat_calc_jump(unsigned int offset)
1059 struct compat_delta *tmp;
1062 for(tmp = compat_offsets, delta = 0; tmp; tmp = tmp->next)
1063 if (tmp->offset < offset)
1064 delta += tmp->delta;
1068 static void compat_standard_from_user(void *dst, void *src)
1070 int v = *(compat_int_t *)src;
1073 v += compat_calc_jump(v);
1074 memcpy(dst, &v, sizeof(v));
1077 static int compat_standard_to_user(void __user *dst, void *src)
1079 compat_int_t cv = *(int *)src;
1082 cv -= compat_calc_jump(cv);
1083 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
1087 compat_calc_match(struct ipt_entry_match *m, int * size)
1089 *size += xt_compat_match_offset(m->u.kernel.match);
1093 static int compat_calc_entry(struct ipt_entry *e,
1094 const struct xt_table_info *info,
1095 void *base, struct xt_table_info *newinfo)
1097 struct ipt_entry_target *t;
1098 unsigned int entry_offset;
1102 entry_offset = (void *)e - base;
1103 IPT_MATCH_ITERATE(e, compat_calc_match, &off);
1104 t = ipt_get_target(e);
1105 off += xt_compat_target_offset(t->u.kernel.target);
1106 newinfo->size -= off;
1107 ret = compat_add_offset(entry_offset, off);
1111 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1112 if (info->hook_entry[i] && (e < (struct ipt_entry *)
1113 (base + info->hook_entry[i])))
1114 newinfo->hook_entry[i] -= off;
1115 if (info->underflow[i] && (e < (struct ipt_entry *)
1116 (base + info->underflow[i])))
1117 newinfo->underflow[i] -= off;
1122 static int compat_table_info(const struct xt_table_info *info,
1123 struct xt_table_info *newinfo)
1125 void *loc_cpu_entry;
1127 if (!newinfo || !info)
1130 /* we dont care about newinfo->entries[] */
1131 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
1132 newinfo->initial_entries = 0;
1133 loc_cpu_entry = info->entries[raw_smp_processor_id()];
1134 return IPT_ENTRY_ITERATE(loc_cpu_entry, info->size,
1135 compat_calc_entry, info, loc_cpu_entry, newinfo);
1139 static int get_info(void __user *user, int *len, int compat)
1141 char name[IPT_TABLE_MAXNAMELEN];
1145 if (*len != sizeof(struct ipt_getinfo)) {
1146 duprintf("length %u != %u\n", *len,
1147 (unsigned int)sizeof(struct ipt_getinfo));
1151 if (copy_from_user(name, user, sizeof(name)) != 0)
1154 name[IPT_TABLE_MAXNAMELEN-1] = '\0';
1155 #ifdef CONFIG_COMPAT
1157 xt_compat_lock(AF_INET);
1159 t = try_then_request_module(xt_find_table_lock(AF_INET, name),
1160 "iptable_%s", name);
1161 if (t && !IS_ERR(t)) {
1162 struct ipt_getinfo info;
1163 struct xt_table_info *private = t->private;
1165 #ifdef CONFIG_COMPAT
1167 struct xt_table_info tmp;
1168 ret = compat_table_info(private, &tmp);
1169 compat_flush_offsets();
1173 info.valid_hooks = t->valid_hooks;
1174 memcpy(info.hook_entry, private->hook_entry,
1175 sizeof(info.hook_entry));
1176 memcpy(info.underflow, private->underflow,
1177 sizeof(info.underflow));
1178 info.num_entries = private->number;
1179 info.size = private->size;
1180 strcpy(info.name, name);
1182 if (copy_to_user(user, &info, *len) != 0)
1190 ret = t ? PTR_ERR(t) : -ENOENT;
1191 #ifdef CONFIG_COMPAT
1193 xt_compat_unlock(AF_INET);
1199 get_entries(struct ipt_get_entries __user *uptr, int *len)
1202 struct ipt_get_entries get;
1205 if (*len < sizeof(get)) {
1206 duprintf("get_entries: %u < %d\n", *len,
1207 (unsigned int)sizeof(get));
1210 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1212 if (*len != sizeof(struct ipt_get_entries) + get.size) {
1213 duprintf("get_entries: %u != %u\n", *len,
1214 (unsigned int)(sizeof(struct ipt_get_entries) +
1219 t = xt_find_table_lock(AF_INET, get.name);
1220 if (t && !IS_ERR(t)) {
1221 struct xt_table_info *private = t->private;
1222 duprintf("t->private->number = %u\n",
1224 if (get.size == private->size)
1225 ret = copy_entries_to_user(private->size,
1226 t, uptr->entrytable);
1228 duprintf("get_entries: I've got %u not %u!\n",
1236 ret = t ? PTR_ERR(t) : -ENOENT;
1242 __do_replace(const char *name, unsigned int valid_hooks,
1243 struct xt_table_info *newinfo, unsigned int num_counters,
1244 void __user *counters_ptr)
1248 struct xt_table_info *oldinfo;
1249 struct xt_counters *counters;
1250 void *loc_cpu_old_entry;
1253 counters = vmalloc(num_counters * sizeof(struct xt_counters));
1259 t = try_then_request_module(xt_find_table_lock(AF_INET, name),
1260 "iptable_%s", name);
1261 if (!t || IS_ERR(t)) {
1262 ret = t ? PTR_ERR(t) : -ENOENT;
1263 goto free_newinfo_counters_untrans;
1267 if (valid_hooks != t->valid_hooks) {
1268 duprintf("Valid hook crap: %08X vs %08X\n",
1269 valid_hooks, t->valid_hooks);
1274 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1278 /* Update module usage count based on number of rules */
1279 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1280 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1281 if ((oldinfo->number > oldinfo->initial_entries) ||
1282 (newinfo->number <= oldinfo->initial_entries))
1284 if ((oldinfo->number > oldinfo->initial_entries) &&
1285 (newinfo->number <= oldinfo->initial_entries))
1288 /* Get the old counters. */
1289 get_counters(oldinfo, counters);
1290 /* Decrease module usage counts and free resource */
1291 loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
1292 IPT_ENTRY_ITERATE(loc_cpu_old_entry, oldinfo->size, cleanup_entry,NULL);
1293 xt_free_table_info(oldinfo);
1294 if (copy_to_user(counters_ptr, counters,
1295 sizeof(struct xt_counters) * num_counters) != 0)
1304 free_newinfo_counters_untrans:
1311 do_replace(void __user *user, unsigned int len)
1314 struct ipt_replace tmp;
1315 struct xt_table_info *newinfo;
1316 void *loc_cpu_entry;
1318 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1321 /* Hack: Causes ipchains to give correct error msg --RR */
1322 if (len != sizeof(tmp) + tmp.size)
1323 return -ENOPROTOOPT;
1325 /* overflow check */
1326 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1329 newinfo = xt_alloc_table_info(tmp.size);
1333 /* choose the copy that is our node/cpu */
1334 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1335 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1341 ret = translate_table(tmp.name, tmp.valid_hooks,
1342 newinfo, loc_cpu_entry, tmp.size, tmp.num_entries,
1343 tmp.hook_entry, tmp.underflow);
1347 duprintf("ip_tables: Translated table\n");
1349 ret = __do_replace(tmp.name, tmp.valid_hooks,
1350 newinfo, tmp.num_counters,
1353 goto free_newinfo_untrans;
1356 free_newinfo_untrans:
1357 IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
1359 xt_free_table_info(newinfo);
1363 /* We're lazy, and add to the first CPU; overflow works its fey magic
1364 * and everything is OK. */
1366 add_counter_to_entry(struct ipt_entry *e,
1367 const struct xt_counters addme[],
1371 duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n",
1373 (long unsigned int)e->counters.pcnt,
1374 (long unsigned int)e->counters.bcnt,
1375 (long unsigned int)addme[*i].pcnt,
1376 (long unsigned int)addme[*i].bcnt);
1379 ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
1386 do_add_counters(void __user *user, unsigned int len, int compat)
1389 struct xt_counters_info tmp;
1390 struct xt_counters *paddc;
1391 unsigned int num_counters;
1396 struct xt_table_info *private;
1398 void *loc_cpu_entry;
1399 #ifdef CONFIG_COMPAT
1400 struct compat_xt_counters_info compat_tmp;
1404 size = sizeof(struct compat_xt_counters_info);
1409 size = sizeof(struct xt_counters_info);
1412 if (copy_from_user(ptmp, user, size) != 0)
1415 #ifdef CONFIG_COMPAT
1417 num_counters = compat_tmp.num_counters;
1418 name = compat_tmp.name;
1422 num_counters = tmp.num_counters;
1426 if (len != size + num_counters * sizeof(struct xt_counters))
1429 paddc = vmalloc_node(len - size, numa_node_id());
1433 if (copy_from_user(paddc, user + size, len - size) != 0) {
1438 t = xt_find_table_lock(AF_INET, name);
1439 if (!t || IS_ERR(t)) {
1440 ret = t ? PTR_ERR(t) : -ENOENT;
1444 write_lock_bh(&t->lock);
1445 private = t->private;
1446 if (private->number != num_counters) {
1448 goto unlock_up_free;
1452 /* Choose the copy that is on our node */
1453 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1454 IPT_ENTRY_ITERATE(loc_cpu_entry,
1456 add_counter_to_entry,
1460 write_unlock_bh(&t->lock);
1469 #ifdef CONFIG_COMPAT
1470 struct compat_ipt_replace {
1471 char name[IPT_TABLE_MAXNAMELEN];
1475 u32 hook_entry[NF_INET_NUMHOOKS];
1476 u32 underflow[NF_INET_NUMHOOKS];
1478 compat_uptr_t counters; /* struct ipt_counters * */
1479 struct compat_ipt_entry entries[0];
1483 compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
1484 compat_uint_t *size, struct xt_counters *counters,
1487 struct ipt_entry_target *t;
1488 struct compat_ipt_entry __user *ce;
1489 u_int16_t target_offset, next_offset;
1490 compat_uint_t origsize;
1495 ce = (struct compat_ipt_entry __user *)*dstptr;
1496 if (copy_to_user(ce, e, sizeof(struct ipt_entry)))
1499 if (copy_to_user(&ce->counters, &counters[*i], sizeof(counters[*i])))
1502 *dstptr += sizeof(struct compat_ipt_entry);
1503 ret = IPT_MATCH_ITERATE(e, xt_compat_match_to_user, dstptr, size);
1504 target_offset = e->target_offset - (origsize - *size);
1507 t = ipt_get_target(e);
1508 ret = xt_compat_target_to_user(t, dstptr, size);
1512 next_offset = e->next_offset - (origsize - *size);
1513 if (put_user(target_offset, &ce->target_offset))
1515 if (put_user(next_offset, &ce->next_offset))
1525 compat_find_calc_match(struct ipt_entry_match *m,
1527 const struct ipt_ip *ip,
1528 unsigned int hookmask,
1531 struct xt_match *match;
1533 match = try_then_request_module(xt_find_match(AF_INET, m->u.user.name,
1534 m->u.user.revision),
1535 "ipt_%s", m->u.user.name);
1536 if (IS_ERR(match) || !match) {
1537 duprintf("compat_check_calc_match: `%s' not found\n",
1539 return match ? PTR_ERR(match) : -ENOENT;
1541 m->u.kernel.match = match;
1542 *size += xt_compat_match_offset(match);
1549 compat_release_match(struct ipt_entry_match *m, unsigned int *i)
1551 if (i && (*i)-- == 0)
1554 module_put(m->u.kernel.match->me);
1559 compat_release_entry(struct ipt_entry *e, unsigned int *i)
1561 struct ipt_entry_target *t;
1563 if (i && (*i)-- == 0)
1566 /* Cleanup all matches */
1567 IPT_MATCH_ITERATE(e, compat_release_match, NULL);
1568 t = ipt_get_target(e);
1569 module_put(t->u.kernel.target->me);
1574 check_compat_entry_size_and_hooks(struct ipt_entry *e,
1575 struct xt_table_info *newinfo,
1577 unsigned char *base,
1578 unsigned char *limit,
1579 unsigned int *hook_entries,
1580 unsigned int *underflows,
1584 struct ipt_entry_target *t;
1585 struct xt_target *target;
1586 unsigned int entry_offset;
1589 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1590 if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0
1591 || (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) {
1592 duprintf("Bad offset %p, limit = %p\n", e, limit);
1596 if (e->next_offset < sizeof(struct compat_ipt_entry) +
1597 sizeof(struct compat_xt_entry_target)) {
1598 duprintf("checking: element %p size %u\n",
1603 ret = check_entry(e, name);
1608 entry_offset = (void *)e - (void *)base;
1610 ret = IPT_MATCH_ITERATE(e, compat_find_calc_match, name, &e->ip,
1611 e->comefrom, &off, &j);
1613 goto release_matches;
1615 t = ipt_get_target(e);
1616 target = try_then_request_module(xt_find_target(AF_INET,
1618 t->u.user.revision),
1619 "ipt_%s", t->u.user.name);
1620 if (IS_ERR(target) || !target) {
1621 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1623 ret = target ? PTR_ERR(target) : -ENOENT;
1624 goto release_matches;
1626 t->u.kernel.target = target;
1628 off += xt_compat_target_offset(target);
1630 ret = compat_add_offset(entry_offset, off);
1634 /* Check hooks & underflows */
1635 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1636 if ((unsigned char *)e - base == hook_entries[h])
1637 newinfo->hook_entry[h] = hook_entries[h];
1638 if ((unsigned char *)e - base == underflows[h])
1639 newinfo->underflow[h] = underflows[h];
1642 /* Clear counters and comefrom */
1643 e->counters = ((struct ipt_counters) { 0, 0 });
1650 module_put(t->u.kernel.target->me);
1652 IPT_MATCH_ITERATE(e, compat_release_match, &j);
1656 static inline int compat_copy_match_from_user(struct ipt_entry_match *m,
1657 void **dstptr, compat_uint_t *size, const char *name,
1658 const struct ipt_ip *ip, unsigned int hookmask)
1660 xt_compat_match_from_user(m, dstptr, size);
1664 static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr,
1665 unsigned int *size, const char *name,
1666 struct xt_table_info *newinfo, unsigned char *base)
1668 struct ipt_entry_target *t;
1669 struct xt_target *target;
1670 struct ipt_entry *de;
1671 unsigned int origsize;
1676 de = (struct ipt_entry *)*dstptr;
1677 memcpy(de, e, sizeof(struct ipt_entry));
1679 *dstptr += sizeof(struct compat_ipt_entry);
1680 ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size,
1681 name, &de->ip, de->comefrom);
1684 de->target_offset = e->target_offset - (origsize - *size);
1685 t = ipt_get_target(e);
1686 target = t->u.kernel.target;
1687 xt_compat_target_from_user(t, dstptr, size);
1689 de->next_offset = e->next_offset - (origsize - *size);
1690 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1691 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1692 newinfo->hook_entry[h] -= origsize - *size;
1693 if ((unsigned char *)de - base < newinfo->underflow[h])
1694 newinfo->underflow[h] -= origsize - *size;
1699 static inline int compat_check_entry(struct ipt_entry *e, const char *name,
1705 ret = IPT_MATCH_ITERATE(e, check_match, name, &e->ip, e->comefrom, &j);
1707 goto cleanup_matches;
1709 ret = check_target(e, name);
1711 goto cleanup_matches;
1717 IPT_MATCH_ITERATE(e, cleanup_match, &j);
1722 translate_compat_table(const char *name,
1723 unsigned int valid_hooks,
1724 struct xt_table_info **pinfo,
1726 unsigned int total_size,
1727 unsigned int number,
1728 unsigned int *hook_entries,
1729 unsigned int *underflows)
1732 struct xt_table_info *newinfo, *info;
1733 void *pos, *entry0, *entry1;
1740 info->number = number;
1742 /* Init all hooks to impossible value. */
1743 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1744 info->hook_entry[i] = 0xFFFFFFFF;
1745 info->underflow[i] = 0xFFFFFFFF;
1748 duprintf("translate_compat_table: size %u\n", info->size);
1750 xt_compat_lock(AF_INET);
1751 /* Walk through entries, checking offsets. */
1752 ret = IPT_ENTRY_ITERATE(entry0, total_size,
1753 check_compat_entry_size_and_hooks,
1754 info, &size, entry0,
1755 entry0 + total_size,
1756 hook_entries, underflows, &j, name);
1762 duprintf("translate_compat_table: %u not %u entries\n",
1767 /* Check hooks all assigned */
1768 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1769 /* Only hooks which are valid */
1770 if (!(valid_hooks & (1 << i)))
1772 if (info->hook_entry[i] == 0xFFFFFFFF) {
1773 duprintf("Invalid hook entry %u %u\n",
1774 i, hook_entries[i]);
1777 if (info->underflow[i] == 0xFFFFFFFF) {
1778 duprintf("Invalid underflow %u %u\n",
1785 newinfo = xt_alloc_table_info(size);
1789 newinfo->number = number;
1790 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1791 newinfo->hook_entry[i] = info->hook_entry[i];
1792 newinfo->underflow[i] = info->underflow[i];
1794 entry1 = newinfo->entries[raw_smp_processor_id()];
1797 ret = IPT_ENTRY_ITERATE(entry0, total_size,
1798 compat_copy_entry_from_user, &pos, &size,
1799 name, newinfo, entry1);
1800 compat_flush_offsets();
1801 xt_compat_unlock(AF_INET);
1806 if (!mark_source_chains(newinfo, valid_hooks, entry1))
1810 ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
1814 IPT_ENTRY_ITERATE_CONTINUE(entry1, newinfo->size, i,
1815 compat_release_entry, &j);
1816 IPT_ENTRY_ITERATE(entry1, newinfo->size, cleanup_entry, &i);
1817 xt_free_table_info(newinfo);
1821 /* And one copy for every other CPU */
1822 for_each_possible_cpu(i)
1823 if (newinfo->entries[i] && newinfo->entries[i] != entry1)
1824 memcpy(newinfo->entries[i], entry1, newinfo->size);
1828 xt_free_table_info(info);
1832 xt_free_table_info(newinfo);
1834 IPT_ENTRY_ITERATE(entry0, total_size, compat_release_entry, &j);
1837 compat_flush_offsets();
1838 xt_compat_unlock(AF_INET);
1843 compat_do_replace(void __user *user, unsigned int len)
1846 struct compat_ipt_replace tmp;
1847 struct xt_table_info *newinfo;
1848 void *loc_cpu_entry;
1850 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1853 /* Hack: Causes ipchains to give correct error msg --RR */
1854 if (len != sizeof(tmp) + tmp.size)
1855 return -ENOPROTOOPT;
1857 /* overflow check */
1858 if (tmp.size >= INT_MAX / num_possible_cpus())
1860 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1863 newinfo = xt_alloc_table_info(tmp.size);
1867 /* choose the copy that is our node/cpu */
1868 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1869 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1875 ret = translate_compat_table(tmp.name, tmp.valid_hooks,
1876 &newinfo, &loc_cpu_entry, tmp.size,
1877 tmp.num_entries, tmp.hook_entry, tmp.underflow);
1881 duprintf("compat_do_replace: Translated table\n");
1883 ret = __do_replace(tmp.name, tmp.valid_hooks,
1884 newinfo, tmp.num_counters,
1885 compat_ptr(tmp.counters));
1887 goto free_newinfo_untrans;
1890 free_newinfo_untrans:
1891 IPT_ENTRY_ITERATE(loc_cpu_entry, newinfo->size, cleanup_entry,NULL);
1893 xt_free_table_info(newinfo);
1898 compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user,
1903 if (!capable(CAP_NET_ADMIN))
1907 case IPT_SO_SET_REPLACE:
1908 ret = compat_do_replace(user, len);
1911 case IPT_SO_SET_ADD_COUNTERS:
1912 ret = do_add_counters(user, len, 1);
1916 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
1923 struct compat_ipt_get_entries
1925 char name[IPT_TABLE_MAXNAMELEN];
1927 struct compat_ipt_entry entrytable[0];
1930 static int compat_copy_entries_to_user(unsigned int total_size,
1931 struct xt_table *table, void __user *userptr)
1933 struct xt_counters *counters;
1934 struct xt_table_info *private = table->private;
1938 void *loc_cpu_entry;
1941 counters = alloc_counters(table);
1942 if (IS_ERR(counters))
1943 return PTR_ERR(counters);
1945 /* choose the copy that is on our node/cpu, ...
1946 * This choice is lazy (because current thread is
1947 * allowed to migrate to another cpu)
1949 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1952 ret = IPT_ENTRY_ITERATE(loc_cpu_entry, total_size,
1953 compat_copy_entry_to_user,
1954 &pos, &size, counters, &i);
1961 compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len)
1964 struct compat_ipt_get_entries get;
1968 if (*len < sizeof(get)) {
1969 duprintf("compat_get_entries: %u < %u\n",
1970 *len, (unsigned int)sizeof(get));
1974 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1977 if (*len != sizeof(struct compat_ipt_get_entries) + get.size) {
1978 duprintf("compat_get_entries: %u != %u\n", *len,
1979 (unsigned int)(sizeof(struct compat_ipt_get_entries) +
1984 xt_compat_lock(AF_INET);
1985 t = xt_find_table_lock(AF_INET, get.name);
1986 if (t && !IS_ERR(t)) {
1987 struct xt_table_info *private = t->private;
1988 struct xt_table_info info;
1989 duprintf("t->private->number = %u\n",
1991 ret = compat_table_info(private, &info);
1992 if (!ret && get.size == info.size) {
1993 ret = compat_copy_entries_to_user(private->size,
1994 t, uptr->entrytable);
1996 duprintf("compat_get_entries: I've got %u not %u!\n",
2001 compat_flush_offsets();
2005 ret = t ? PTR_ERR(t) : -ENOENT;
2007 xt_compat_unlock(AF_INET);
2011 static int do_ipt_get_ctl(struct sock *, int, void __user *, int *);
2014 compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2018 if (!capable(CAP_NET_ADMIN))
2022 case IPT_SO_GET_INFO:
2023 ret = get_info(user, len, 1);
2025 case IPT_SO_GET_ENTRIES:
2026 ret = compat_get_entries(user, len);
2029 ret = do_ipt_get_ctl(sk, cmd, user, len);
2036 do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2040 if (!capable(CAP_NET_ADMIN))
2044 case IPT_SO_SET_REPLACE:
2045 ret = do_replace(user, len);
2048 case IPT_SO_SET_ADD_COUNTERS:
2049 ret = do_add_counters(user, len, 0);
2053 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
2061 do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2065 if (!capable(CAP_NET_ADMIN))
2069 case IPT_SO_GET_INFO:
2070 ret = get_info(user, len, 0);
2073 case IPT_SO_GET_ENTRIES:
2074 ret = get_entries(user, len);
2077 case IPT_SO_GET_REVISION_MATCH:
2078 case IPT_SO_GET_REVISION_TARGET: {
2079 struct ipt_get_revision rev;
2082 if (*len != sizeof(rev)) {
2086 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
2091 if (cmd == IPT_SO_GET_REVISION_TARGET)
2096 try_then_request_module(xt_find_revision(AF_INET, rev.name,
2099 "ipt_%s", rev.name);
2104 duprintf("do_ipt_get_ctl: unknown request %i\n", cmd);
2111 int ipt_register_table(struct xt_table *table, const struct ipt_replace *repl)
2114 struct xt_table_info *newinfo;
2115 struct xt_table_info bootstrap
2116 = { 0, 0, 0, { 0 }, { 0 }, { } };
2117 void *loc_cpu_entry;
2119 newinfo = xt_alloc_table_info(repl->size);
2123 /* choose the copy on our node/cpu
2124 * but dont care of preemption
2126 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
2127 memcpy(loc_cpu_entry, repl->entries, repl->size);
2129 ret = translate_table(table->name, table->valid_hooks,
2130 newinfo, loc_cpu_entry, repl->size,
2135 xt_free_table_info(newinfo);
2139 ret = xt_register_table(table, &bootstrap, newinfo);
2141 xt_free_table_info(newinfo);
2148 void ipt_unregister_table(struct xt_table *table)
2150 struct xt_table_info *private;
2151 void *loc_cpu_entry;
2153 private = xt_unregister_table(table);
2155 /* Decrease module usage counts and free resources */
2156 loc_cpu_entry = private->entries[raw_smp_processor_id()];
2157 IPT_ENTRY_ITERATE(loc_cpu_entry, private->size, cleanup_entry, NULL);
2158 xt_free_table_info(private);
2161 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2163 icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2164 u_int8_t type, u_int8_t code,
2167 return ((test_type == 0xFF) || (type == test_type && code >= min_code && code <= max_code))
2172 icmp_match(const struct sk_buff *skb,
2173 const struct net_device *in,
2174 const struct net_device *out,
2175 const struct xt_match *match,
2176 const void *matchinfo,
2178 unsigned int protoff,
2181 struct icmphdr _icmph, *ic;
2182 const struct ipt_icmp *icmpinfo = matchinfo;
2184 /* Must not be a fragment. */
2188 ic = skb_header_pointer(skb, protoff, sizeof(_icmph), &_icmph);
2190 /* We've been asked to examine this packet, and we
2191 * can't. Hence, no choice but to drop.
2193 duprintf("Dropping evil ICMP tinygram.\n");
2198 return icmp_type_code_match(icmpinfo->type,
2202 !!(icmpinfo->invflags&IPT_ICMP_INV));
2205 /* Called when user tries to insert an entry of this type. */
2207 icmp_checkentry(const char *tablename,
2209 const struct xt_match *match,
2211 unsigned int hook_mask)
2213 const struct ipt_icmp *icmpinfo = matchinfo;
2215 /* Must specify no unknown invflags */
2216 return !(icmpinfo->invflags & ~IPT_ICMP_INV);
2219 /* The built-in targets: standard (NULL) and error. */
2220 static struct xt_target ipt_standard_target __read_mostly = {
2221 .name = IPT_STANDARD_TARGET,
2222 .targetsize = sizeof(int),
2224 #ifdef CONFIG_COMPAT
2225 .compatsize = sizeof(compat_int_t),
2226 .compat_from_user = compat_standard_from_user,
2227 .compat_to_user = compat_standard_to_user,
2231 static struct xt_target ipt_error_target __read_mostly = {
2232 .name = IPT_ERROR_TARGET,
2233 .target = ipt_error,
2234 .targetsize = IPT_FUNCTION_MAXNAMELEN,
2238 static struct nf_sockopt_ops ipt_sockopts = {
2240 .set_optmin = IPT_BASE_CTL,
2241 .set_optmax = IPT_SO_SET_MAX+1,
2242 .set = do_ipt_set_ctl,
2243 #ifdef CONFIG_COMPAT
2244 .compat_set = compat_do_ipt_set_ctl,
2246 .get_optmin = IPT_BASE_CTL,
2247 .get_optmax = IPT_SO_GET_MAX+1,
2248 .get = do_ipt_get_ctl,
2249 #ifdef CONFIG_COMPAT
2250 .compat_get = compat_do_ipt_get_ctl,
2252 .owner = THIS_MODULE,
2255 static struct xt_match icmp_matchstruct __read_mostly = {
2257 .match = icmp_match,
2258 .matchsize = sizeof(struct ipt_icmp),
2259 .proto = IPPROTO_ICMP,
2261 .checkentry = icmp_checkentry,
2264 static int __init ip_tables_init(void)
2268 ret = xt_proto_init(AF_INET);
2272 /* Noone else will be downing sem now, so we won't sleep */
2273 ret = xt_register_target(&ipt_standard_target);
2276 ret = xt_register_target(&ipt_error_target);
2279 ret = xt_register_match(&icmp_matchstruct);
2283 /* Register setsockopt */
2284 ret = nf_register_sockopt(&ipt_sockopts);
2288 printk(KERN_INFO "ip_tables: (C) 2000-2006 Netfilter Core Team\n");
2292 xt_unregister_match(&icmp_matchstruct);
2294 xt_unregister_target(&ipt_error_target);
2296 xt_unregister_target(&ipt_standard_target);
2298 xt_proto_fini(AF_INET);
2303 static void __exit ip_tables_fini(void)
2305 nf_unregister_sockopt(&ipt_sockopts);
2307 xt_unregister_match(&icmp_matchstruct);
2308 xt_unregister_target(&ipt_error_target);
2309 xt_unregister_target(&ipt_standard_target);
2311 xt_proto_fini(AF_INET);
2314 EXPORT_SYMBOL(ipt_register_table);
2315 EXPORT_SYMBOL(ipt_unregister_table);
2316 EXPORT_SYMBOL(ipt_do_table);
2317 module_init(ip_tables_init);
2318 module_exit(ip_tables_fini);