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/cache.h>
13 #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/icmp.h>
21 #include <net/compat.h>
22 #include <asm/uaccess.h>
23 #include <linux/mutex.h>
24 #include <linux/proc_fs.h>
25 #include <linux/err.h>
26 #include <linux/cpumask.h>
28 #include <linux/netfilter/x_tables.h>
29 #include <linux/netfilter_ipv4/ip_tables.h>
30 #include <net/netfilter/nf_log.h>
31 #include "../../netfilter/xt_repldata.h"
33 MODULE_LICENSE("GPL");
34 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
35 MODULE_DESCRIPTION("IPv4 packet filter");
37 /*#define DEBUG_IP_FIREWALL*/
38 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
39 /*#define DEBUG_IP_FIREWALL_USER*/
41 #ifdef DEBUG_IP_FIREWALL
42 #define dprintf(format, args...) pr_info(format , ## args)
44 #define dprintf(format, args...)
47 #ifdef DEBUG_IP_FIREWALL_USER
48 #define duprintf(format, args...) pr_info(format , ## args)
50 #define duprintf(format, args...)
53 #ifdef CONFIG_NETFILTER_DEBUG
54 #define IP_NF_ASSERT(x) WARN_ON(!(x))
56 #define IP_NF_ASSERT(x)
60 /* All the better to debug you with... */
65 void *ipt_alloc_initial_table(const struct xt_table *info)
67 return xt_alloc_initial_table(ipt, IPT);
69 EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
71 /* Returns whether matches rule or not. */
72 /* Performance critical - called for every packet */
74 ip_packet_match(const struct iphdr *ip,
77 const struct ipt_ip *ipinfo,
82 #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
84 if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
86 FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
88 dprintf("Source or dest mismatch.\n");
90 dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
91 &ip->saddr, &ipinfo->smsk.s_addr, &ipinfo->src.s_addr,
92 ipinfo->invflags & IPT_INV_SRCIP ? " (INV)" : "");
93 dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n",
94 &ip->daddr, &ipinfo->dmsk.s_addr, &ipinfo->dst.s_addr,
95 ipinfo->invflags & IPT_INV_DSTIP ? " (INV)" : "");
99 ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
101 if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
102 dprintf("VIA in mismatch (%s vs %s).%s\n",
103 indev, ipinfo->iniface,
104 ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
108 ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
110 if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
111 dprintf("VIA out mismatch (%s vs %s).%s\n",
112 outdev, ipinfo->outiface,
113 ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
117 /* Check specific protocol */
119 FWINV(ip->protocol != ipinfo->proto, IPT_INV_PROTO)) {
120 dprintf("Packet protocol %hi does not match %hi.%s\n",
121 ip->protocol, ipinfo->proto,
122 ipinfo->invflags&IPT_INV_PROTO ? " (INV)":"");
126 /* If we have a fragment rule but the packet is not a fragment
127 * then we return zero */
128 if (FWINV((ipinfo->flags&IPT_F_FRAG) && !isfrag, IPT_INV_FRAG)) {
129 dprintf("Fragment rule but not fragment.%s\n",
130 ipinfo->invflags & IPT_INV_FRAG ? " (INV)" : "");
138 ip_checkentry(const struct ipt_ip *ip)
140 if (ip->flags & ~IPT_F_MASK) {
141 duprintf("Unknown flag bits set: %08X\n",
142 ip->flags & ~IPT_F_MASK);
145 if (ip->invflags & ~IPT_INV_MASK) {
146 duprintf("Unknown invflag bits set: %08X\n",
147 ip->invflags & ~IPT_INV_MASK);
154 ipt_error(struct sk_buff *skb, const struct xt_action_param *par)
157 pr_info("error: `%s'\n", (const char *)par->targinfo);
162 /* Performance critical */
163 static inline struct ipt_entry *
164 get_entry(const void *base, unsigned int offset)
166 return (struct ipt_entry *)(base + offset);
169 /* All zeroes == unconditional rule. */
170 /* Mildly perf critical (only if packet tracing is on) */
171 static inline bool unconditional(const struct ipt_ip *ip)
173 static const struct ipt_ip uncond;
175 return memcmp(ip, &uncond, sizeof(uncond)) == 0;
179 /* for const-correctness */
180 static inline const struct xt_entry_target *
181 ipt_get_target_c(const struct ipt_entry *e)
183 return ipt_get_target((struct ipt_entry *)e);
186 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
187 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
188 static const char *const hooknames[] = {
189 [NF_INET_PRE_ROUTING] = "PREROUTING",
190 [NF_INET_LOCAL_IN] = "INPUT",
191 [NF_INET_FORWARD] = "FORWARD",
192 [NF_INET_LOCAL_OUT] = "OUTPUT",
193 [NF_INET_POST_ROUTING] = "POSTROUTING",
196 enum nf_ip_trace_comments {
197 NF_IP_TRACE_COMMENT_RULE,
198 NF_IP_TRACE_COMMENT_RETURN,
199 NF_IP_TRACE_COMMENT_POLICY,
202 static const char *const comments[] = {
203 [NF_IP_TRACE_COMMENT_RULE] = "rule",
204 [NF_IP_TRACE_COMMENT_RETURN] = "return",
205 [NF_IP_TRACE_COMMENT_POLICY] = "policy",
208 static struct nf_loginfo trace_loginfo = {
209 .type = NF_LOG_TYPE_LOG,
213 .logflags = NF_LOG_MASK,
218 /* Mildly perf critical (only if packet tracing is on) */
220 get_chainname_rulenum(const struct ipt_entry *s, const struct ipt_entry *e,
221 const char *hookname, const char **chainname,
222 const char **comment, unsigned int *rulenum)
224 const struct xt_standard_target *t = (void *)ipt_get_target_c(s);
226 if (strcmp(t->target.u.kernel.target->name, XT_ERROR_TARGET) == 0) {
227 /* Head of user chain: ERROR target with chainname */
228 *chainname = t->target.data;
233 if (s->target_offset == sizeof(struct ipt_entry) &&
234 strcmp(t->target.u.kernel.target->name,
235 XT_STANDARD_TARGET) == 0 &&
237 unconditional(&s->ip)) {
238 /* Tail of chains: STANDARD target (return/policy) */
239 *comment = *chainname == hookname
240 ? comments[NF_IP_TRACE_COMMENT_POLICY]
241 : comments[NF_IP_TRACE_COMMENT_RETURN];
250 static void trace_packet(const struct sk_buff *skb,
252 const struct net_device *in,
253 const struct net_device *out,
254 const char *tablename,
255 const struct xt_table_info *private,
256 const struct ipt_entry *e)
258 const void *table_base;
259 const struct ipt_entry *root;
260 const char *hookname, *chainname, *comment;
261 const struct ipt_entry *iter;
262 unsigned int rulenum = 0;
264 table_base = private->entries[smp_processor_id()];
265 root = get_entry(table_base, private->hook_entry[hook]);
267 hookname = chainname = hooknames[hook];
268 comment = comments[NF_IP_TRACE_COMMENT_RULE];
270 xt_entry_foreach(iter, root, private->size - private->hook_entry[hook])
271 if (get_chainname_rulenum(iter, e, hookname,
272 &chainname, &comment, &rulenum) != 0)
275 nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo,
276 "TRACE: %s:%s:%s:%u ",
277 tablename, chainname, comment, rulenum);
282 struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry)
284 return (void *)entry + entry->next_offset;
287 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
289 ipt_do_table(struct sk_buff *skb,
291 const struct net_device *in,
292 const struct net_device *out,
293 struct xt_table *table)
295 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
296 const struct iphdr *ip;
297 /* Initializing verdict to NF_DROP keeps gcc happy. */
298 unsigned int verdict = NF_DROP;
299 const char *indev, *outdev;
300 const void *table_base;
301 struct ipt_entry *e, **jumpstack;
302 unsigned int *stackptr, origptr, cpu;
303 const struct xt_table_info *private;
304 struct xt_action_param acpar;
309 indev = in ? in->name : nulldevname;
310 outdev = out ? out->name : nulldevname;
311 /* We handle fragments by dealing with the first fragment as
312 * if it was a normal packet. All other fragments are treated
313 * normally, except that they will NEVER match rules that ask
314 * things we don't know, ie. tcp syn flag or ports). If the
315 * rule is also a fragment-specific rule, non-fragments won't
317 acpar.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
318 acpar.thoff = ip_hdrlen(skb);
319 acpar.hotdrop = false;
322 acpar.family = NFPROTO_IPV4;
323 acpar.hooknum = hook;
325 IP_NF_ASSERT(table->valid_hooks & (1 << hook));
327 addend = xt_write_recseq_begin();
328 private = table->private;
329 cpu = smp_processor_id();
330 table_base = private->entries[cpu];
331 jumpstack = (struct ipt_entry **)private->jumpstack[cpu];
332 stackptr = per_cpu_ptr(private->stackptr, cpu);
335 e = get_entry(table_base, private->hook_entry[hook]);
337 pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
338 table->name, hook, origptr,
339 get_entry(table_base, private->underflow[hook]));
342 const struct xt_entry_target *t;
343 const struct xt_entry_match *ematch;
346 if (!ip_packet_match(ip, indev, outdev,
347 &e->ip, acpar.fragoff)) {
349 e = ipt_next_entry(e);
353 xt_ematch_foreach(ematch, e) {
354 acpar.match = ematch->u.kernel.match;
355 acpar.matchinfo = ematch->data;
356 if (!acpar.match->match(skb, &acpar))
360 ADD_COUNTER(e->counters, skb->len, 1);
362 t = ipt_get_target(e);
363 IP_NF_ASSERT(t->u.kernel.target);
365 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
366 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
367 /* The packet is traced: log it */
368 if (unlikely(skb->nf_trace))
369 trace_packet(skb, hook, in, out,
370 table->name, private, e);
372 /* Standard target? */
373 if (!t->u.kernel.target->target) {
376 v = ((struct xt_standard_target *)t)->verdict;
378 /* Pop from stack? */
379 if (v != XT_RETURN) {
380 verdict = (unsigned)(-v) - 1;
383 if (*stackptr <= origptr) {
384 e = get_entry(table_base,
385 private->underflow[hook]);
386 pr_debug("Underflow (this is normal) "
389 e = jumpstack[--*stackptr];
390 pr_debug("Pulled %p out from pos %u\n",
392 e = ipt_next_entry(e);
396 if (table_base + v != ipt_next_entry(e) &&
397 !(e->ip.flags & IPT_F_GOTO)) {
398 if (*stackptr >= private->stacksize) {
402 jumpstack[(*stackptr)++] = e;
403 pr_debug("Pushed %p into pos %u\n",
407 e = get_entry(table_base, v);
411 acpar.target = t->u.kernel.target;
412 acpar.targinfo = t->data;
414 verdict = t->u.kernel.target->target(skb, &acpar);
415 /* Target might have changed stuff. */
417 if (verdict == XT_CONTINUE)
418 e = ipt_next_entry(e);
422 } while (!acpar.hotdrop);
423 pr_debug("Exiting %s; resetting sp from %u to %u\n",
424 __func__, *stackptr, origptr);
426 xt_write_recseq_end(addend);
429 #ifdef DEBUG_ALLOW_ALL
438 /* Figures out from what hook each rule can be called: returns 0 if
439 there are loops. Puts hook bitmask in comefrom. */
441 mark_source_chains(const struct xt_table_info *newinfo,
442 unsigned int valid_hooks, void *entry0)
446 /* No recursion; use packet counter to save back ptrs (reset
447 to 0 as we leave), and comefrom to save source hook bitmask */
448 for (hook = 0; hook < NF_INET_NUMHOOKS; hook++) {
449 unsigned int pos = newinfo->hook_entry[hook];
450 struct ipt_entry *e = (struct ipt_entry *)(entry0 + pos);
452 if (!(valid_hooks & (1 << hook)))
455 /* Set initial back pointer. */
456 e->counters.pcnt = pos;
459 const struct xt_standard_target *t
460 = (void *)ipt_get_target_c(e);
461 int visited = e->comefrom & (1 << hook);
463 if (e->comefrom & (1 << NF_INET_NUMHOOKS)) {
464 pr_err("iptables: loop hook %u pos %u %08X.\n",
465 hook, pos, e->comefrom);
468 e->comefrom |= ((1 << hook) | (1 << NF_INET_NUMHOOKS));
470 /* Unconditional return/END. */
471 if ((e->target_offset == sizeof(struct ipt_entry) &&
472 (strcmp(t->target.u.user.name,
473 XT_STANDARD_TARGET) == 0) &&
474 t->verdict < 0 && unconditional(&e->ip)) ||
476 unsigned int oldpos, size;
478 if ((strcmp(t->target.u.user.name,
479 XT_STANDARD_TARGET) == 0) &&
480 t->verdict < -NF_MAX_VERDICT - 1) {
481 duprintf("mark_source_chains: bad "
482 "negative verdict (%i)\n",
487 /* Return: backtrack through the last
490 e->comefrom ^= (1<<NF_INET_NUMHOOKS);
491 #ifdef DEBUG_IP_FIREWALL_USER
493 & (1 << NF_INET_NUMHOOKS)) {
494 duprintf("Back unset "
501 pos = e->counters.pcnt;
502 e->counters.pcnt = 0;
504 /* We're at the start. */
508 e = (struct ipt_entry *)
510 } while (oldpos == pos + e->next_offset);
513 size = e->next_offset;
514 e = (struct ipt_entry *)
515 (entry0 + pos + size);
516 e->counters.pcnt = pos;
519 int newpos = t->verdict;
521 if (strcmp(t->target.u.user.name,
522 XT_STANDARD_TARGET) == 0 &&
524 if (newpos > newinfo->size -
525 sizeof(struct ipt_entry)) {
526 duprintf("mark_source_chains: "
527 "bad verdict (%i)\n",
531 /* This a jump; chase it. */
532 duprintf("Jump rule %u -> %u\n",
535 /* ... this is a fallthru */
536 newpos = pos + e->next_offset;
538 e = (struct ipt_entry *)
540 e->counters.pcnt = pos;
545 duprintf("Finished chain %u\n", hook);
550 static void cleanup_match(struct xt_entry_match *m, struct net *net)
552 struct xt_mtdtor_param par;
555 par.match = m->u.kernel.match;
556 par.matchinfo = m->data;
557 par.family = NFPROTO_IPV4;
558 if (par.match->destroy != NULL)
559 par.match->destroy(&par);
560 module_put(par.match->me);
564 check_entry(const struct ipt_entry *e, const char *name)
566 const struct xt_entry_target *t;
568 if (!ip_checkentry(&e->ip)) {
569 duprintf("ip check failed %p %s.\n", e, name);
573 if (e->target_offset + sizeof(struct xt_entry_target) >
577 t = ipt_get_target_c(e);
578 if (e->target_offset + t->u.target_size > e->next_offset)
585 check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
587 const struct ipt_ip *ip = par->entryinfo;
590 par->match = m->u.kernel.match;
591 par->matchinfo = m->data;
593 ret = xt_check_match(par, m->u.match_size - sizeof(*m),
594 ip->proto, ip->invflags & IPT_INV_PROTO);
596 duprintf("check failed for `%s'.\n", par->match->name);
603 find_check_match(struct xt_entry_match *m, struct xt_mtchk_param *par)
605 struct xt_match *match;
608 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
611 duprintf("find_check_match: `%s' not found\n", m->u.user.name);
612 return PTR_ERR(match);
614 m->u.kernel.match = match;
616 ret = check_match(m, par);
622 module_put(m->u.kernel.match->me);
626 static int check_target(struct ipt_entry *e, struct net *net, const char *name)
628 struct xt_entry_target *t = ipt_get_target(e);
629 struct xt_tgchk_param par = {
633 .target = t->u.kernel.target,
635 .hook_mask = e->comefrom,
636 .family = NFPROTO_IPV4,
640 ret = xt_check_target(&par, t->u.target_size - sizeof(*t),
641 e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
643 duprintf("check failed for `%s'.\n",
644 t->u.kernel.target->name);
651 find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
654 struct xt_entry_target *t;
655 struct xt_target *target;
658 struct xt_mtchk_param mtpar;
659 struct xt_entry_match *ematch;
661 ret = check_entry(e, name);
668 mtpar.entryinfo = &e->ip;
669 mtpar.hook_mask = e->comefrom;
670 mtpar.family = NFPROTO_IPV4;
671 xt_ematch_foreach(ematch, e) {
672 ret = find_check_match(ematch, &mtpar);
674 goto cleanup_matches;
678 t = ipt_get_target(e);
679 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
681 if (IS_ERR(target)) {
682 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
683 ret = PTR_ERR(target);
684 goto cleanup_matches;
686 t->u.kernel.target = target;
688 ret = check_target(e, net, name);
693 module_put(t->u.kernel.target->me);
695 xt_ematch_foreach(ematch, e) {
698 cleanup_match(ematch, net);
703 static bool check_underflow(const struct ipt_entry *e)
705 const struct xt_entry_target *t;
706 unsigned int verdict;
708 if (!unconditional(&e->ip))
710 t = ipt_get_target_c(e);
711 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
713 verdict = ((struct xt_standard_target *)t)->verdict;
714 verdict = -verdict - 1;
715 return verdict == NF_DROP || verdict == NF_ACCEPT;
719 check_entry_size_and_hooks(struct ipt_entry *e,
720 struct xt_table_info *newinfo,
721 const unsigned char *base,
722 const unsigned char *limit,
723 const unsigned int *hook_entries,
724 const unsigned int *underflows,
725 unsigned int valid_hooks)
729 if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
730 (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
731 duprintf("Bad offset %p\n", e);
736 < sizeof(struct ipt_entry) + sizeof(struct xt_entry_target)) {
737 duprintf("checking: element %p size %u\n",
742 /* Check hooks & underflows */
743 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
744 if (!(valid_hooks & (1 << h)))
746 if ((unsigned char *)e - base == hook_entries[h])
747 newinfo->hook_entry[h] = hook_entries[h];
748 if ((unsigned char *)e - base == underflows[h]) {
749 if (!check_underflow(e)) {
750 pr_err("Underflows must be unconditional and "
751 "use the STANDARD target with "
755 newinfo->underflow[h] = underflows[h];
759 /* Clear counters and comefrom */
760 e->counters = ((struct xt_counters) { 0, 0 });
766 cleanup_entry(struct ipt_entry *e, struct net *net)
768 struct xt_tgdtor_param par;
769 struct xt_entry_target *t;
770 struct xt_entry_match *ematch;
772 /* Cleanup all matches */
773 xt_ematch_foreach(ematch, e)
774 cleanup_match(ematch, net);
775 t = ipt_get_target(e);
778 par.target = t->u.kernel.target;
779 par.targinfo = t->data;
780 par.family = NFPROTO_IPV4;
781 if (par.target->destroy != NULL)
782 par.target->destroy(&par);
783 module_put(par.target->me);
786 /* Checks and translates the user-supplied table segment (held in
789 translate_table(struct net *net, struct xt_table_info *newinfo, void *entry0,
790 const struct ipt_replace *repl)
792 struct ipt_entry *iter;
796 newinfo->size = repl->size;
797 newinfo->number = repl->num_entries;
799 /* Init all hooks to impossible value. */
800 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
801 newinfo->hook_entry[i] = 0xFFFFFFFF;
802 newinfo->underflow[i] = 0xFFFFFFFF;
805 duprintf("translate_table: size %u\n", newinfo->size);
807 /* Walk through entries, checking offsets. */
808 xt_entry_foreach(iter, entry0, newinfo->size) {
809 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
817 if (strcmp(ipt_get_target(iter)->u.user.name,
818 XT_ERROR_TARGET) == 0)
819 ++newinfo->stacksize;
822 if (i != repl->num_entries) {
823 duprintf("translate_table: %u not %u entries\n",
824 i, repl->num_entries);
828 /* Check hooks all assigned */
829 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
830 /* Only hooks which are valid */
831 if (!(repl->valid_hooks & (1 << i)))
833 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
834 duprintf("Invalid hook entry %u %u\n",
835 i, repl->hook_entry[i]);
838 if (newinfo->underflow[i] == 0xFFFFFFFF) {
839 duprintf("Invalid underflow %u %u\n",
840 i, repl->underflow[i]);
845 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
848 /* Finally, each sanity check must pass */
850 xt_entry_foreach(iter, entry0, newinfo->size) {
851 ret = find_check_entry(iter, net, repl->name, repl->size);
858 xt_entry_foreach(iter, entry0, newinfo->size) {
861 cleanup_entry(iter, net);
866 /* And one copy for every other CPU */
867 for_each_possible_cpu(i) {
868 if (newinfo->entries[i] && newinfo->entries[i] != entry0)
869 memcpy(newinfo->entries[i], entry0, newinfo->size);
876 get_counters(const struct xt_table_info *t,
877 struct xt_counters counters[])
879 struct ipt_entry *iter;
883 for_each_possible_cpu(cpu) {
884 seqcount_t *s = &per_cpu(xt_recseq, cpu);
887 xt_entry_foreach(iter, t->entries[cpu], t->size) {
892 start = read_seqcount_begin(s);
893 bcnt = iter->counters.bcnt;
894 pcnt = iter->counters.pcnt;
895 } while (read_seqcount_retry(s, start));
897 ADD_COUNTER(counters[i], bcnt, pcnt);
898 ++i; /* macro does multi eval of i */
903 static struct xt_counters *alloc_counters(const struct xt_table *table)
905 unsigned int countersize;
906 struct xt_counters *counters;
907 const struct xt_table_info *private = table->private;
909 /* We need atomic snapshot of counters: rest doesn't change
910 (other than comefrom, which userspace doesn't care
912 countersize = sizeof(struct xt_counters) * private->number;
913 counters = vzalloc(countersize);
915 if (counters == NULL)
916 return ERR_PTR(-ENOMEM);
918 get_counters(private, counters);
924 copy_entries_to_user(unsigned int total_size,
925 const struct xt_table *table,
926 void __user *userptr)
928 unsigned int off, num;
929 const struct ipt_entry *e;
930 struct xt_counters *counters;
931 const struct xt_table_info *private = table->private;
933 const void *loc_cpu_entry;
935 counters = alloc_counters(table);
936 if (IS_ERR(counters))
937 return PTR_ERR(counters);
939 /* choose the copy that is on our node/cpu, ...
940 * This choice is lazy (because current thread is
941 * allowed to migrate to another cpu)
943 loc_cpu_entry = private->entries[raw_smp_processor_id()];
944 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
949 /* FIXME: use iterator macros --RR */
950 /* ... then go back and fix counters and names */
951 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
953 const struct xt_entry_match *m;
954 const struct xt_entry_target *t;
956 e = (struct ipt_entry *)(loc_cpu_entry + off);
957 if (copy_to_user(userptr + off
958 + offsetof(struct ipt_entry, counters),
960 sizeof(counters[num])) != 0) {
965 for (i = sizeof(struct ipt_entry);
966 i < e->target_offset;
967 i += m->u.match_size) {
970 if (copy_to_user(userptr + off + i
971 + offsetof(struct xt_entry_match,
973 m->u.kernel.match->name,
974 strlen(m->u.kernel.match->name)+1)
981 t = ipt_get_target_c(e);
982 if (copy_to_user(userptr + off + e->target_offset
983 + offsetof(struct xt_entry_target,
985 t->u.kernel.target->name,
986 strlen(t->u.kernel.target->name)+1) != 0) {
998 static void compat_standard_from_user(void *dst, const void *src)
1000 int v = *(compat_int_t *)src;
1003 v += xt_compat_calc_jump(AF_INET, v);
1004 memcpy(dst, &v, sizeof(v));
1007 static int compat_standard_to_user(void __user *dst, const void *src)
1009 compat_int_t cv = *(int *)src;
1012 cv -= xt_compat_calc_jump(AF_INET, cv);
1013 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
1016 static int compat_calc_entry(const struct ipt_entry *e,
1017 const struct xt_table_info *info,
1018 const void *base, struct xt_table_info *newinfo)
1020 const struct xt_entry_match *ematch;
1021 const struct xt_entry_target *t;
1022 unsigned int entry_offset;
1025 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1026 entry_offset = (void *)e - base;
1027 xt_ematch_foreach(ematch, e)
1028 off += xt_compat_match_offset(ematch->u.kernel.match);
1029 t = ipt_get_target_c(e);
1030 off += xt_compat_target_offset(t->u.kernel.target);
1031 newinfo->size -= off;
1032 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
1036 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1037 if (info->hook_entry[i] &&
1038 (e < (struct ipt_entry *)(base + info->hook_entry[i])))
1039 newinfo->hook_entry[i] -= off;
1040 if (info->underflow[i] &&
1041 (e < (struct ipt_entry *)(base + info->underflow[i])))
1042 newinfo->underflow[i] -= off;
1047 static int compat_table_info(const struct xt_table_info *info,
1048 struct xt_table_info *newinfo)
1050 struct ipt_entry *iter;
1051 void *loc_cpu_entry;
1054 if (!newinfo || !info)
1057 /* we dont care about newinfo->entries[] */
1058 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
1059 newinfo->initial_entries = 0;
1060 loc_cpu_entry = info->entries[raw_smp_processor_id()];
1061 xt_compat_init_offsets(AF_INET, info->number);
1062 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
1063 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
1071 static int get_info(struct net *net, void __user *user,
1072 const int *len, int compat)
1074 char name[XT_TABLE_MAXNAMELEN];
1078 if (*len != sizeof(struct ipt_getinfo)) {
1079 duprintf("length %u != %zu\n", *len,
1080 sizeof(struct ipt_getinfo));
1084 if (copy_from_user(name, user, sizeof(name)) != 0)
1087 name[XT_TABLE_MAXNAMELEN-1] = '\0';
1088 #ifdef CONFIG_COMPAT
1090 xt_compat_lock(AF_INET);
1092 t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
1093 "iptable_%s", name);
1094 if (t && !IS_ERR(t)) {
1095 struct ipt_getinfo info;
1096 const struct xt_table_info *private = t->private;
1097 #ifdef CONFIG_COMPAT
1098 struct xt_table_info tmp;
1101 ret = compat_table_info(private, &tmp);
1102 xt_compat_flush_offsets(AF_INET);
1106 memset(&info, 0, sizeof(info));
1107 info.valid_hooks = t->valid_hooks;
1108 memcpy(info.hook_entry, private->hook_entry,
1109 sizeof(info.hook_entry));
1110 memcpy(info.underflow, private->underflow,
1111 sizeof(info.underflow));
1112 info.num_entries = private->number;
1113 info.size = private->size;
1114 strcpy(info.name, name);
1116 if (copy_to_user(user, &info, *len) != 0)
1124 ret = t ? PTR_ERR(t) : -ENOENT;
1125 #ifdef CONFIG_COMPAT
1127 xt_compat_unlock(AF_INET);
1133 get_entries(struct net *net, struct ipt_get_entries __user *uptr,
1137 struct ipt_get_entries get;
1140 if (*len < sizeof(get)) {
1141 duprintf("get_entries: %u < %zu\n", *len, sizeof(get));
1144 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1146 if (*len != sizeof(struct ipt_get_entries) + get.size) {
1147 duprintf("get_entries: %u != %zu\n",
1148 *len, sizeof(get) + get.size);
1152 t = xt_find_table_lock(net, AF_INET, get.name);
1153 if (t && !IS_ERR(t)) {
1154 const struct xt_table_info *private = t->private;
1155 duprintf("t->private->number = %u\n", private->number);
1156 if (get.size == private->size)
1157 ret = copy_entries_to_user(private->size,
1158 t, uptr->entrytable);
1160 duprintf("get_entries: I've got %u not %u!\n",
1161 private->size, get.size);
1167 ret = t ? PTR_ERR(t) : -ENOENT;
1173 __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
1174 struct xt_table_info *newinfo, unsigned int num_counters,
1175 void __user *counters_ptr)
1179 struct xt_table_info *oldinfo;
1180 struct xt_counters *counters;
1181 void *loc_cpu_old_entry;
1182 struct ipt_entry *iter;
1185 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1191 t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
1192 "iptable_%s", name);
1193 if (!t || IS_ERR(t)) {
1194 ret = t ? PTR_ERR(t) : -ENOENT;
1195 goto free_newinfo_counters_untrans;
1199 if (valid_hooks != t->valid_hooks) {
1200 duprintf("Valid hook crap: %08X vs %08X\n",
1201 valid_hooks, t->valid_hooks);
1206 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1210 /* Update module usage count based on number of rules */
1211 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1212 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1213 if ((oldinfo->number > oldinfo->initial_entries) ||
1214 (newinfo->number <= oldinfo->initial_entries))
1216 if ((oldinfo->number > oldinfo->initial_entries) &&
1217 (newinfo->number <= oldinfo->initial_entries))
1220 /* Get the old counters, and synchronize with replace */
1221 get_counters(oldinfo, counters);
1223 /* Decrease module usage counts and free resource */
1224 loc_cpu_old_entry = oldinfo->entries[raw_smp_processor_id()];
1225 xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
1226 cleanup_entry(iter, net);
1228 xt_free_table_info(oldinfo);
1229 if (copy_to_user(counters_ptr, counters,
1230 sizeof(struct xt_counters) * num_counters) != 0)
1239 free_newinfo_counters_untrans:
1246 do_replace(struct net *net, const void __user *user, unsigned int len)
1249 struct ipt_replace tmp;
1250 struct xt_table_info *newinfo;
1251 void *loc_cpu_entry;
1252 struct ipt_entry *iter;
1254 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1257 /* overflow check */
1258 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1260 tmp.name[sizeof(tmp.name)-1] = 0;
1262 newinfo = xt_alloc_table_info(tmp.size);
1266 /* choose the copy that is on our node/cpu */
1267 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1268 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1274 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
1278 duprintf("Translated table\n");
1280 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1281 tmp.num_counters, tmp.counters);
1283 goto free_newinfo_untrans;
1286 free_newinfo_untrans:
1287 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1288 cleanup_entry(iter, net);
1290 xt_free_table_info(newinfo);
1295 do_add_counters(struct net *net, const void __user *user,
1296 unsigned int len, int compat)
1298 unsigned int i, curcpu;
1299 struct xt_counters_info tmp;
1300 struct xt_counters *paddc;
1301 unsigned int num_counters;
1306 const struct xt_table_info *private;
1308 void *loc_cpu_entry;
1309 struct ipt_entry *iter;
1310 unsigned int addend;
1311 #ifdef CONFIG_COMPAT
1312 struct compat_xt_counters_info compat_tmp;
1316 size = sizeof(struct compat_xt_counters_info);
1321 size = sizeof(struct xt_counters_info);
1324 if (copy_from_user(ptmp, user, size) != 0)
1327 #ifdef CONFIG_COMPAT
1329 num_counters = compat_tmp.num_counters;
1330 name = compat_tmp.name;
1334 num_counters = tmp.num_counters;
1338 if (len != size + num_counters * sizeof(struct xt_counters))
1341 paddc = vmalloc(len - size);
1345 if (copy_from_user(paddc, user + size, len - size) != 0) {
1350 t = xt_find_table_lock(net, AF_INET, name);
1351 if (!t || IS_ERR(t)) {
1352 ret = t ? PTR_ERR(t) : -ENOENT;
1357 private = t->private;
1358 if (private->number != num_counters) {
1360 goto unlock_up_free;
1364 /* Choose the copy that is on our node */
1365 curcpu = smp_processor_id();
1366 loc_cpu_entry = private->entries[curcpu];
1367 addend = xt_write_recseq_begin();
1368 xt_entry_foreach(iter, loc_cpu_entry, private->size) {
1369 ADD_COUNTER(iter->counters, paddc[i].bcnt, paddc[i].pcnt);
1372 xt_write_recseq_end(addend);
1383 #ifdef CONFIG_COMPAT
1384 struct compat_ipt_replace {
1385 char name[XT_TABLE_MAXNAMELEN];
1389 u32 hook_entry[NF_INET_NUMHOOKS];
1390 u32 underflow[NF_INET_NUMHOOKS];
1392 compat_uptr_t counters; /* struct xt_counters * */
1393 struct compat_ipt_entry entries[0];
1397 compat_copy_entry_to_user(struct ipt_entry *e, void __user **dstptr,
1398 unsigned int *size, struct xt_counters *counters,
1401 struct xt_entry_target *t;
1402 struct compat_ipt_entry __user *ce;
1403 u_int16_t target_offset, next_offset;
1404 compat_uint_t origsize;
1405 const struct xt_entry_match *ematch;
1409 ce = (struct compat_ipt_entry __user *)*dstptr;
1410 if (copy_to_user(ce, e, sizeof(struct ipt_entry)) != 0 ||
1411 copy_to_user(&ce->counters, &counters[i],
1412 sizeof(counters[i])) != 0)
1415 *dstptr += sizeof(struct compat_ipt_entry);
1416 *size -= sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1418 xt_ematch_foreach(ematch, e) {
1419 ret = xt_compat_match_to_user(ematch, dstptr, size);
1423 target_offset = e->target_offset - (origsize - *size);
1424 t = ipt_get_target(e);
1425 ret = xt_compat_target_to_user(t, dstptr, size);
1428 next_offset = e->next_offset - (origsize - *size);
1429 if (put_user(target_offset, &ce->target_offset) != 0 ||
1430 put_user(next_offset, &ce->next_offset) != 0)
1436 compat_find_calc_match(struct xt_entry_match *m,
1438 const struct ipt_ip *ip,
1439 unsigned int hookmask,
1442 struct xt_match *match;
1444 match = xt_request_find_match(NFPROTO_IPV4, m->u.user.name,
1445 m->u.user.revision);
1446 if (IS_ERR(match)) {
1447 duprintf("compat_check_calc_match: `%s' not found\n",
1449 return PTR_ERR(match);
1451 m->u.kernel.match = match;
1452 *size += xt_compat_match_offset(match);
1456 static void compat_release_entry(struct compat_ipt_entry *e)
1458 struct xt_entry_target *t;
1459 struct xt_entry_match *ematch;
1461 /* Cleanup all matches */
1462 xt_ematch_foreach(ematch, e)
1463 module_put(ematch->u.kernel.match->me);
1464 t = compat_ipt_get_target(e);
1465 module_put(t->u.kernel.target->me);
1469 check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
1470 struct xt_table_info *newinfo,
1472 const unsigned char *base,
1473 const unsigned char *limit,
1474 const unsigned int *hook_entries,
1475 const unsigned int *underflows,
1478 struct xt_entry_match *ematch;
1479 struct xt_entry_target *t;
1480 struct xt_target *target;
1481 unsigned int entry_offset;
1485 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1486 if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 ||
1487 (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) {
1488 duprintf("Bad offset %p, limit = %p\n", e, limit);
1492 if (e->next_offset < sizeof(struct compat_ipt_entry) +
1493 sizeof(struct compat_xt_entry_target)) {
1494 duprintf("checking: element %p size %u\n",
1499 /* For purposes of check_entry casting the compat entry is fine */
1500 ret = check_entry((struct ipt_entry *)e, name);
1504 off = sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1505 entry_offset = (void *)e - (void *)base;
1507 xt_ematch_foreach(ematch, e) {
1508 ret = compat_find_calc_match(ematch, name,
1509 &e->ip, e->comefrom, &off);
1511 goto release_matches;
1515 t = compat_ipt_get_target(e);
1516 target = xt_request_find_target(NFPROTO_IPV4, t->u.user.name,
1517 t->u.user.revision);
1518 if (IS_ERR(target)) {
1519 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1521 ret = PTR_ERR(target);
1522 goto release_matches;
1524 t->u.kernel.target = target;
1526 off += xt_compat_target_offset(target);
1528 ret = xt_compat_add_offset(AF_INET, entry_offset, off);
1532 /* Check hooks & underflows */
1533 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1534 if ((unsigned char *)e - base == hook_entries[h])
1535 newinfo->hook_entry[h] = hook_entries[h];
1536 if ((unsigned char *)e - base == underflows[h])
1537 newinfo->underflow[h] = underflows[h];
1540 /* Clear counters and comefrom */
1541 memset(&e->counters, 0, sizeof(e->counters));
1546 module_put(t->u.kernel.target->me);
1548 xt_ematch_foreach(ematch, e) {
1551 module_put(ematch->u.kernel.match->me);
1557 compat_copy_entry_from_user(struct compat_ipt_entry *e, void **dstptr,
1558 unsigned int *size, const char *name,
1559 struct xt_table_info *newinfo, unsigned char *base)
1561 struct xt_entry_target *t;
1562 struct xt_target *target;
1563 struct ipt_entry *de;
1564 unsigned int origsize;
1566 struct xt_entry_match *ematch;
1570 de = (struct ipt_entry *)*dstptr;
1571 memcpy(de, e, sizeof(struct ipt_entry));
1572 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1574 *dstptr += sizeof(struct ipt_entry);
1575 *size += sizeof(struct ipt_entry) - sizeof(struct compat_ipt_entry);
1577 xt_ematch_foreach(ematch, e) {
1578 ret = xt_compat_match_from_user(ematch, dstptr, size);
1582 de->target_offset = e->target_offset - (origsize - *size);
1583 t = compat_ipt_get_target(e);
1584 target = t->u.kernel.target;
1585 xt_compat_target_from_user(t, dstptr, size);
1587 de->next_offset = e->next_offset - (origsize - *size);
1588 for (h = 0; h < NF_INET_NUMHOOKS; h++) {
1589 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1590 newinfo->hook_entry[h] -= origsize - *size;
1591 if ((unsigned char *)de - base < newinfo->underflow[h])
1592 newinfo->underflow[h] -= origsize - *size;
1598 compat_check_entry(struct ipt_entry *e, struct net *net, const char *name)
1600 struct xt_entry_match *ematch;
1601 struct xt_mtchk_param mtpar;
1608 mtpar.entryinfo = &e->ip;
1609 mtpar.hook_mask = e->comefrom;
1610 mtpar.family = NFPROTO_IPV4;
1611 xt_ematch_foreach(ematch, e) {
1612 ret = check_match(ematch, &mtpar);
1614 goto cleanup_matches;
1618 ret = check_target(e, net, name);
1620 goto cleanup_matches;
1624 xt_ematch_foreach(ematch, e) {
1627 cleanup_match(ematch, net);
1633 translate_compat_table(struct net *net,
1635 unsigned int valid_hooks,
1636 struct xt_table_info **pinfo,
1638 unsigned int total_size,
1639 unsigned int number,
1640 unsigned int *hook_entries,
1641 unsigned int *underflows)
1644 struct xt_table_info *newinfo, *info;
1645 void *pos, *entry0, *entry1;
1646 struct compat_ipt_entry *iter0;
1647 struct ipt_entry *iter1;
1654 info->number = number;
1656 /* Init all hooks to impossible value. */
1657 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1658 info->hook_entry[i] = 0xFFFFFFFF;
1659 info->underflow[i] = 0xFFFFFFFF;
1662 duprintf("translate_compat_table: size %u\n", info->size);
1664 xt_compat_lock(AF_INET);
1665 xt_compat_init_offsets(AF_INET, number);
1666 /* Walk through entries, checking offsets. */
1667 xt_entry_foreach(iter0, entry0, total_size) {
1668 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1670 entry0 + total_size,
1681 duprintf("translate_compat_table: %u not %u entries\n",
1686 /* Check hooks all assigned */
1687 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1688 /* Only hooks which are valid */
1689 if (!(valid_hooks & (1 << i)))
1691 if (info->hook_entry[i] == 0xFFFFFFFF) {
1692 duprintf("Invalid hook entry %u %u\n",
1693 i, hook_entries[i]);
1696 if (info->underflow[i] == 0xFFFFFFFF) {
1697 duprintf("Invalid underflow %u %u\n",
1704 newinfo = xt_alloc_table_info(size);
1708 newinfo->number = number;
1709 for (i = 0; i < NF_INET_NUMHOOKS; i++) {
1710 newinfo->hook_entry[i] = info->hook_entry[i];
1711 newinfo->underflow[i] = info->underflow[i];
1713 entry1 = newinfo->entries[raw_smp_processor_id()];
1716 xt_entry_foreach(iter0, entry0, total_size) {
1717 ret = compat_copy_entry_from_user(iter0, &pos, &size,
1718 name, newinfo, entry1);
1722 xt_compat_flush_offsets(AF_INET);
1723 xt_compat_unlock(AF_INET);
1728 if (!mark_source_chains(newinfo, valid_hooks, entry1))
1732 xt_entry_foreach(iter1, entry1, newinfo->size) {
1733 ret = compat_check_entry(iter1, net, name);
1737 if (strcmp(ipt_get_target(iter1)->u.user.name,
1738 XT_ERROR_TARGET) == 0)
1739 ++newinfo->stacksize;
1743 * The first i matches need cleanup_entry (calls ->destroy)
1744 * because they had called ->check already. The other j-i
1745 * entries need only release.
1749 xt_entry_foreach(iter0, entry0, newinfo->size) {
1754 compat_release_entry(iter0);
1756 xt_entry_foreach(iter1, entry1, newinfo->size) {
1759 cleanup_entry(iter1, net);
1761 xt_free_table_info(newinfo);
1765 /* And one copy for every other CPU */
1766 for_each_possible_cpu(i)
1767 if (newinfo->entries[i] && newinfo->entries[i] != entry1)
1768 memcpy(newinfo->entries[i], entry1, newinfo->size);
1772 xt_free_table_info(info);
1776 xt_free_table_info(newinfo);
1778 xt_entry_foreach(iter0, entry0, total_size) {
1781 compat_release_entry(iter0);
1785 xt_compat_flush_offsets(AF_INET);
1786 xt_compat_unlock(AF_INET);
1791 compat_do_replace(struct net *net, void __user *user, unsigned int len)
1794 struct compat_ipt_replace tmp;
1795 struct xt_table_info *newinfo;
1796 void *loc_cpu_entry;
1797 struct ipt_entry *iter;
1799 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1802 /* overflow check */
1803 if (tmp.size >= INT_MAX / num_possible_cpus())
1805 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1807 tmp.name[sizeof(tmp.name)-1] = 0;
1809 newinfo = xt_alloc_table_info(tmp.size);
1813 /* choose the copy that is on our node/cpu */
1814 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
1815 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1821 ret = translate_compat_table(net, tmp.name, tmp.valid_hooks,
1822 &newinfo, &loc_cpu_entry, tmp.size,
1823 tmp.num_entries, tmp.hook_entry,
1828 duprintf("compat_do_replace: Translated table\n");
1830 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1831 tmp.num_counters, compat_ptr(tmp.counters));
1833 goto free_newinfo_untrans;
1836 free_newinfo_untrans:
1837 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1838 cleanup_entry(iter, net);
1840 xt_free_table_info(newinfo);
1845 compat_do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user,
1850 if (!capable(CAP_NET_ADMIN))
1854 case IPT_SO_SET_REPLACE:
1855 ret = compat_do_replace(sock_net(sk), user, len);
1858 case IPT_SO_SET_ADD_COUNTERS:
1859 ret = do_add_counters(sock_net(sk), user, len, 1);
1863 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
1870 struct compat_ipt_get_entries {
1871 char name[XT_TABLE_MAXNAMELEN];
1873 struct compat_ipt_entry entrytable[0];
1877 compat_copy_entries_to_user(unsigned int total_size, struct xt_table *table,
1878 void __user *userptr)
1880 struct xt_counters *counters;
1881 const struct xt_table_info *private = table->private;
1885 const void *loc_cpu_entry;
1887 struct ipt_entry *iter;
1889 counters = alloc_counters(table);
1890 if (IS_ERR(counters))
1891 return PTR_ERR(counters);
1893 /* choose the copy that is on our node/cpu, ...
1894 * This choice is lazy (because current thread is
1895 * allowed to migrate to another cpu)
1897 loc_cpu_entry = private->entries[raw_smp_processor_id()];
1900 xt_entry_foreach(iter, loc_cpu_entry, total_size) {
1901 ret = compat_copy_entry_to_user(iter, &pos,
1902 &size, counters, i++);
1912 compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
1916 struct compat_ipt_get_entries get;
1919 if (*len < sizeof(get)) {
1920 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1924 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1927 if (*len != sizeof(struct compat_ipt_get_entries) + get.size) {
1928 duprintf("compat_get_entries: %u != %zu\n",
1929 *len, sizeof(get) + get.size);
1933 xt_compat_lock(AF_INET);
1934 t = xt_find_table_lock(net, AF_INET, get.name);
1935 if (t && !IS_ERR(t)) {
1936 const struct xt_table_info *private = t->private;
1937 struct xt_table_info info;
1938 duprintf("t->private->number = %u\n", private->number);
1939 ret = compat_table_info(private, &info);
1940 if (!ret && get.size == info.size) {
1941 ret = compat_copy_entries_to_user(private->size,
1942 t, uptr->entrytable);
1944 duprintf("compat_get_entries: I've got %u not %u!\n",
1945 private->size, get.size);
1948 xt_compat_flush_offsets(AF_INET);
1952 ret = t ? PTR_ERR(t) : -ENOENT;
1954 xt_compat_unlock(AF_INET);
1958 static int do_ipt_get_ctl(struct sock *, int, void __user *, int *);
1961 compat_do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1965 if (!capable(CAP_NET_ADMIN))
1969 case IPT_SO_GET_INFO:
1970 ret = get_info(sock_net(sk), user, len, 1);
1972 case IPT_SO_GET_ENTRIES:
1973 ret = compat_get_entries(sock_net(sk), user, len);
1976 ret = do_ipt_get_ctl(sk, cmd, user, len);
1983 do_ipt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1987 if (!capable(CAP_NET_ADMIN))
1991 case IPT_SO_SET_REPLACE:
1992 ret = do_replace(sock_net(sk), user, len);
1995 case IPT_SO_SET_ADD_COUNTERS:
1996 ret = do_add_counters(sock_net(sk), user, len, 0);
2000 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd);
2008 do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2012 if (!capable(CAP_NET_ADMIN))
2016 case IPT_SO_GET_INFO:
2017 ret = get_info(sock_net(sk), user, len, 0);
2020 case IPT_SO_GET_ENTRIES:
2021 ret = get_entries(sock_net(sk), user, len);
2024 case IPT_SO_GET_REVISION_MATCH:
2025 case IPT_SO_GET_REVISION_TARGET: {
2026 struct xt_get_revision rev;
2029 if (*len != sizeof(rev)) {
2033 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
2037 rev.name[sizeof(rev.name)-1] = 0;
2039 if (cmd == IPT_SO_GET_REVISION_TARGET)
2044 try_then_request_module(xt_find_revision(AF_INET, rev.name,
2047 "ipt_%s", rev.name);
2052 duprintf("do_ipt_get_ctl: unknown request %i\n", cmd);
2059 struct xt_table *ipt_register_table(struct net *net,
2060 const struct xt_table *table,
2061 const struct ipt_replace *repl)
2064 struct xt_table_info *newinfo;
2065 struct xt_table_info bootstrap = {0};
2066 void *loc_cpu_entry;
2067 struct xt_table *new_table;
2069 newinfo = xt_alloc_table_info(repl->size);
2075 /* choose the copy on our node/cpu, but dont care about preemption */
2076 loc_cpu_entry = newinfo->entries[raw_smp_processor_id()];
2077 memcpy(loc_cpu_entry, repl->entries, repl->size);
2079 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
2083 new_table = xt_register_table(net, table, &bootstrap, newinfo);
2084 if (IS_ERR(new_table)) {
2085 ret = PTR_ERR(new_table);
2092 xt_free_table_info(newinfo);
2094 return ERR_PTR(ret);
2097 void ipt_unregister_table(struct net *net, struct xt_table *table)
2099 struct xt_table_info *private;
2100 void *loc_cpu_entry;
2101 struct module *table_owner = table->me;
2102 struct ipt_entry *iter;
2104 private = xt_unregister_table(table);
2106 /* Decrease module usage counts and free resources */
2107 loc_cpu_entry = private->entries[raw_smp_processor_id()];
2108 xt_entry_foreach(iter, loc_cpu_entry, private->size)
2109 cleanup_entry(iter, net);
2110 if (private->number > private->initial_entries)
2111 module_put(table_owner);
2112 xt_free_table_info(private);
2115 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2117 icmp_type_code_match(u_int8_t test_type, u_int8_t min_code, u_int8_t max_code,
2118 u_int8_t type, u_int8_t code,
2121 return ((test_type == 0xFF) ||
2122 (type == test_type && code >= min_code && code <= max_code))
2127 icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
2129 const struct icmphdr *ic;
2130 struct icmphdr _icmph;
2131 const struct ipt_icmp *icmpinfo = par->matchinfo;
2133 /* Must not be a fragment. */
2134 if (par->fragoff != 0)
2137 ic = skb_header_pointer(skb, par->thoff, sizeof(_icmph), &_icmph);
2139 /* We've been asked to examine this packet, and we
2140 * can't. Hence, no choice but to drop.
2142 duprintf("Dropping evil ICMP tinygram.\n");
2143 par->hotdrop = true;
2147 return icmp_type_code_match(icmpinfo->type,
2151 !!(icmpinfo->invflags&IPT_ICMP_INV));
2154 static int icmp_checkentry(const struct xt_mtchk_param *par)
2156 const struct ipt_icmp *icmpinfo = par->matchinfo;
2158 /* Must specify no unknown invflags */
2159 return (icmpinfo->invflags & ~IPT_ICMP_INV) ? -EINVAL : 0;
2162 static struct xt_target ipt_builtin_tg[] __read_mostly = {
2164 .name = XT_STANDARD_TARGET,
2165 .targetsize = sizeof(int),
2166 .family = NFPROTO_IPV4,
2167 #ifdef CONFIG_COMPAT
2168 .compatsize = sizeof(compat_int_t),
2169 .compat_from_user = compat_standard_from_user,
2170 .compat_to_user = compat_standard_to_user,
2174 .name = XT_ERROR_TARGET,
2175 .target = ipt_error,
2176 .targetsize = XT_FUNCTION_MAXNAMELEN,
2177 .family = NFPROTO_IPV4,
2181 static struct nf_sockopt_ops ipt_sockopts = {
2183 .set_optmin = IPT_BASE_CTL,
2184 .set_optmax = IPT_SO_SET_MAX+1,
2185 .set = do_ipt_set_ctl,
2186 #ifdef CONFIG_COMPAT
2187 .compat_set = compat_do_ipt_set_ctl,
2189 .get_optmin = IPT_BASE_CTL,
2190 .get_optmax = IPT_SO_GET_MAX+1,
2191 .get = do_ipt_get_ctl,
2192 #ifdef CONFIG_COMPAT
2193 .compat_get = compat_do_ipt_get_ctl,
2195 .owner = THIS_MODULE,
2198 static struct xt_match ipt_builtin_mt[] __read_mostly = {
2201 .match = icmp_match,
2202 .matchsize = sizeof(struct ipt_icmp),
2203 .checkentry = icmp_checkentry,
2204 .proto = IPPROTO_ICMP,
2205 .family = NFPROTO_IPV4,
2209 static int __net_init ip_tables_net_init(struct net *net)
2211 return xt_proto_init(net, NFPROTO_IPV4);
2214 static void __net_exit ip_tables_net_exit(struct net *net)
2216 xt_proto_fini(net, NFPROTO_IPV4);
2219 static struct pernet_operations ip_tables_net_ops = {
2220 .init = ip_tables_net_init,
2221 .exit = ip_tables_net_exit,
2224 static int __init ip_tables_init(void)
2228 ret = register_pernet_subsys(&ip_tables_net_ops);
2232 /* No one else will be downing sem now, so we won't sleep */
2233 ret = xt_register_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2236 ret = xt_register_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2240 /* Register setsockopt */
2241 ret = nf_register_sockopt(&ipt_sockopts);
2245 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2249 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2251 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2253 unregister_pernet_subsys(&ip_tables_net_ops);
2258 static void __exit ip_tables_fini(void)
2260 nf_unregister_sockopt(&ipt_sockopts);
2262 xt_unregister_matches(ipt_builtin_mt, ARRAY_SIZE(ipt_builtin_mt));
2263 xt_unregister_targets(ipt_builtin_tg, ARRAY_SIZE(ipt_builtin_tg));
2264 unregister_pernet_subsys(&ip_tables_net_ops);
2267 EXPORT_SYMBOL(ipt_register_table);
2268 EXPORT_SYMBOL(ipt_unregister_table);
2269 EXPORT_SYMBOL(ipt_do_table);
2270 module_init(ip_tables_init);
2271 module_exit(ip_tables_fini);