2 * Packet matching code for ARP packets.
4 * Based heavily, if not almost entirely, upon ip_tables.c framework.
6 * Some ARP specific bits are:
8 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
9 * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net>
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
16 #include <linux/capability.h>
17 #include <linux/if_arp.h>
18 #include <linux/kmod.h>
19 #include <linux/vmalloc.h>
20 #include <linux/proc_fs.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/mutex.h>
24 #include <linux/err.h>
25 #include <net/compat.h>
27 #include <asm/uaccess.h>
29 #include <linux/netfilter/x_tables.h>
30 #include <linux/netfilter_arp/arp_tables.h>
31 #include "../../netfilter/xt_repldata.h"
33 MODULE_LICENSE("GPL");
34 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
35 MODULE_DESCRIPTION("arptables core");
37 /*#define DEBUG_ARP_TABLES*/
38 /*#define DEBUG_ARP_TABLES_USER*/
40 #ifdef DEBUG_ARP_TABLES
41 #define dprintf(format, args...) printk(format , ## args)
43 #define dprintf(format, args...)
46 #ifdef DEBUG_ARP_TABLES_USER
47 #define duprintf(format, args...) printk(format , ## args)
49 #define duprintf(format, args...)
52 #ifdef CONFIG_NETFILTER_DEBUG
53 #define ARP_NF_ASSERT(x) WARN_ON(!(x))
55 #define ARP_NF_ASSERT(x)
58 void *arpt_alloc_initial_table(const struct xt_table *info)
60 return xt_alloc_initial_table(arpt, ARPT);
62 EXPORT_SYMBOL_GPL(arpt_alloc_initial_table);
64 static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
65 const char *hdr_addr, int len)
69 if (len > ARPT_DEV_ADDR_LEN_MAX)
70 len = ARPT_DEV_ADDR_LEN_MAX;
73 for (i = 0; i < len; i++)
74 ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i];
80 * Unfortunately, _b and _mask are not aligned to an int (or long int)
81 * Some arches dont care, unrolling the loop is a win on them.
82 * For other arches, we only have a 16bit alignement.
84 static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
86 #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
87 unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
89 unsigned long ret = 0;
90 const u16 *a = (const u16 *)_a;
91 const u16 *b = (const u16 *)_b;
92 const u16 *mask = (const u16 *)_mask;
95 for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
96 ret |= (a[i] ^ b[i]) & mask[i];
101 /* Returns whether packet matches rule or not. */
102 static inline int arp_packet_match(const struct arphdr *arphdr,
103 struct net_device *dev,
106 const struct arpt_arp *arpinfo)
108 const char *arpptr = (char *)(arphdr + 1);
109 const char *src_devaddr, *tgt_devaddr;
110 __be32 src_ipaddr, tgt_ipaddr;
113 #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg)))
115 if (FWINV((arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop,
117 dprintf("ARP operation field mismatch.\n");
118 dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n",
119 arphdr->ar_op, arpinfo->arpop, arpinfo->arpop_mask);
123 if (FWINV((arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd,
125 dprintf("ARP hardware address format mismatch.\n");
126 dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n",
127 arphdr->ar_hrd, arpinfo->arhrd, arpinfo->arhrd_mask);
131 if (FWINV((arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro,
133 dprintf("ARP protocol address format mismatch.\n");
134 dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n",
135 arphdr->ar_pro, arpinfo->arpro, arpinfo->arpro_mask);
139 if (FWINV((arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln,
141 dprintf("ARP hardware address length mismatch.\n");
142 dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n",
143 arphdr->ar_hln, arpinfo->arhln, arpinfo->arhln_mask);
147 src_devaddr = arpptr;
148 arpptr += dev->addr_len;
149 memcpy(&src_ipaddr, arpptr, sizeof(u32));
150 arpptr += sizeof(u32);
151 tgt_devaddr = arpptr;
152 arpptr += dev->addr_len;
153 memcpy(&tgt_ipaddr, arpptr, sizeof(u32));
155 if (FWINV(arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr, dev->addr_len),
156 ARPT_INV_SRCDEVADDR) ||
157 FWINV(arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr, dev->addr_len),
158 ARPT_INV_TGTDEVADDR)) {
159 dprintf("Source or target device address mismatch.\n");
164 if (FWINV((src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr,
166 FWINV(((tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr),
168 dprintf("Source or target IP address mismatch.\n");
170 dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
172 &arpinfo->smsk.s_addr,
173 &arpinfo->src.s_addr,
174 arpinfo->invflags & ARPT_INV_SRCIP ? " (INV)" : "");
175 dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n",
177 &arpinfo->tmsk.s_addr,
178 &arpinfo->tgt.s_addr,
179 arpinfo->invflags & ARPT_INV_TGTIP ? " (INV)" : "");
183 /* Look for ifname matches. */
184 ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask);
186 if (FWINV(ret != 0, ARPT_INV_VIA_IN)) {
187 dprintf("VIA in mismatch (%s vs %s).%s\n",
188 indev, arpinfo->iniface,
189 arpinfo->invflags & ARPT_INV_VIA_IN ? " (INV)" : "");
193 ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask);
195 if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
196 dprintf("VIA out mismatch (%s vs %s).%s\n",
197 outdev, arpinfo->outiface,
198 arpinfo->invflags & ARPT_INV_VIA_OUT ? " (INV)" : "");
206 static inline int arp_checkentry(const struct arpt_arp *arp)
208 if (arp->flags & ~ARPT_F_MASK) {
209 duprintf("Unknown flag bits set: %08X\n",
210 arp->flags & ~ARPT_F_MASK);
213 if (arp->invflags & ~ARPT_INV_MASK) {
214 duprintf("Unknown invflag bits set: %08X\n",
215 arp->invflags & ~ARPT_INV_MASK);
223 arpt_error(struct sk_buff *skb, const struct xt_action_param *par)
225 net_err_ratelimited("arp_tables: error: '%s'\n",
226 (const char *)par->targinfo);
231 static inline const struct xt_entry_target *
232 arpt_get_target_c(const struct arpt_entry *e)
234 return arpt_get_target((struct arpt_entry *)e);
237 static inline struct arpt_entry *
238 get_entry(const void *base, unsigned int offset)
240 return (struct arpt_entry *)(base + offset);
244 struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
246 return (void *)entry + entry->next_offset;
249 unsigned int arpt_do_table(struct sk_buff *skb,
250 const struct nf_hook_state *state,
251 struct xt_table *table)
253 unsigned int hook = state->hook;
254 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
255 unsigned int verdict = NF_DROP;
256 const struct arphdr *arp;
257 struct arpt_entry *e, **jumpstack;
258 const char *indev, *outdev;
259 const void *table_base;
260 unsigned int cpu, stackidx = 0;
261 const struct xt_table_info *private;
262 struct xt_action_param acpar;
265 if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
268 indev = state->in ? state->in->name : nulldevname;
269 outdev = state->out ? state->out->name : nulldevname;
272 addend = xt_write_recseq_begin();
273 private = table->private;
274 cpu = smp_processor_id();
276 * Ensure we load private-> members after we've fetched the base
279 smp_read_barrier_depends();
280 table_base = private->entries;
281 jumpstack = (struct arpt_entry **)private->jumpstack[cpu];
283 /* No TEE support for arptables, so no need to switch to alternate
284 * stack. All targets that reenter must return absolute verdicts.
286 e = get_entry(table_base, private->hook_entry[hook]);
288 acpar.net = state->net;
289 acpar.in = state->in;
290 acpar.out = state->out;
291 acpar.hooknum = hook;
292 acpar.family = NFPROTO_ARP;
293 acpar.hotdrop = false;
297 const struct xt_entry_target *t;
298 struct xt_counters *counter;
300 if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
301 e = arpt_next_entry(e);
305 counter = xt_get_this_cpu_counter(&e->counters);
306 ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1);
308 t = arpt_get_target_c(e);
310 /* Standard target? */
311 if (!t->u.kernel.target->target) {
314 v = ((struct xt_standard_target *)t)->verdict;
316 /* Pop from stack? */
317 if (v != XT_RETURN) {
318 verdict = (unsigned int)(-v) - 1;
322 e = get_entry(table_base,
323 private->underflow[hook]);
325 e = jumpstack[--stackidx];
326 e = arpt_next_entry(e);
331 != arpt_next_entry(e)) {
332 jumpstack[stackidx++] = e;
335 e = get_entry(table_base, v);
339 acpar.target = t->u.kernel.target;
340 acpar.targinfo = t->data;
341 verdict = t->u.kernel.target->target(skb, &acpar);
343 /* Target might have changed stuff. */
346 if (verdict == XT_CONTINUE)
347 e = arpt_next_entry(e);
351 } while (!acpar.hotdrop);
352 xt_write_recseq_end(addend);
361 /* All zeroes == unconditional rule. */
362 static inline bool unconditional(const struct arpt_entry *e)
364 static const struct arpt_arp uncond;
366 return e->target_offset == sizeof(struct arpt_entry) &&
367 memcmp(&e->arp, &uncond, sizeof(uncond)) == 0;
370 static bool find_jump_target(const struct xt_table_info *t,
371 const struct arpt_entry *target)
373 struct arpt_entry *iter;
375 xt_entry_foreach(iter, t->entries, t->size) {
382 /* Figures out from what hook each rule can be called: returns 0 if
383 * there are loops. Puts hook bitmask in comefrom.
385 static int mark_source_chains(const struct xt_table_info *newinfo,
386 unsigned int valid_hooks, void *entry0)
390 /* No recursion; use packet counter to save back ptrs (reset
391 * to 0 as we leave), and comefrom to save source hook bitmask.
393 for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) {
394 unsigned int pos = newinfo->hook_entry[hook];
396 = (struct arpt_entry *)(entry0 + pos);
398 if (!(valid_hooks & (1 << hook)))
401 /* Set initial back pointer. */
402 e->counters.pcnt = pos;
405 const struct xt_standard_target *t
406 = (void *)arpt_get_target_c(e);
407 int visited = e->comefrom & (1 << hook);
409 if (e->comefrom & (1 << NF_ARP_NUMHOOKS)) {
410 pr_notice("arptables: loop hook %u pos %u %08X.\n",
411 hook, pos, e->comefrom);
415 |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS));
417 /* Unconditional return/END. */
418 if ((unconditional(e) &&
419 (strcmp(t->target.u.user.name,
420 XT_STANDARD_TARGET) == 0) &&
421 t->verdict < 0) || visited) {
422 unsigned int oldpos, size;
424 if ((strcmp(t->target.u.user.name,
425 XT_STANDARD_TARGET) == 0) &&
426 t->verdict < -NF_MAX_VERDICT - 1) {
427 duprintf("mark_source_chains: bad "
428 "negative verdict (%i)\n",
433 /* Return: backtrack through the last
437 e->comefrom ^= (1<<NF_ARP_NUMHOOKS);
439 pos = e->counters.pcnt;
440 e->counters.pcnt = 0;
442 /* We're at the start. */
446 e = (struct arpt_entry *)
448 } while (oldpos == pos + e->next_offset);
451 size = e->next_offset;
452 e = (struct arpt_entry *)
453 (entry0 + pos + size);
454 if (pos + size >= newinfo->size)
456 e->counters.pcnt = pos;
459 int newpos = t->verdict;
461 if (strcmp(t->target.u.user.name,
462 XT_STANDARD_TARGET) == 0 &&
464 if (newpos > newinfo->size -
465 sizeof(struct arpt_entry)) {
466 duprintf("mark_source_chains: "
467 "bad verdict (%i)\n",
472 /* This a jump; chase it. */
473 duprintf("Jump rule %u -> %u\n",
475 e = (struct arpt_entry *)
477 if (!find_jump_target(newinfo, e))
480 /* ... this is a fallthru */
481 newpos = pos + e->next_offset;
482 if (newpos >= newinfo->size)
485 e = (struct arpt_entry *)
487 e->counters.pcnt = pos;
492 duprintf("Finished chain %u\n", hook);
497 static inline int check_target(struct arpt_entry *e, const char *name)
499 struct xt_entry_target *t = arpt_get_target(e);
501 struct xt_tgchk_param par = {
504 .target = t->u.kernel.target,
506 .hook_mask = e->comefrom,
507 .family = NFPROTO_ARP,
510 ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
512 duprintf("arp_tables: check failed for `%s'.\n",
513 t->u.kernel.target->name);
520 find_check_entry(struct arpt_entry *e, const char *name, unsigned int size)
522 struct xt_entry_target *t;
523 struct xt_target *target;
526 e->counters.pcnt = xt_percpu_counter_alloc();
527 if (IS_ERR_VALUE(e->counters.pcnt))
530 t = arpt_get_target(e);
531 target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
533 if (IS_ERR(target)) {
534 duprintf("find_check_entry: `%s' not found\n", t->u.user.name);
535 ret = PTR_ERR(target);
538 t->u.kernel.target = target;
540 ret = check_target(e, name);
545 module_put(t->u.kernel.target->me);
547 xt_percpu_counter_free(e->counters.pcnt);
552 static bool check_underflow(const struct arpt_entry *e)
554 const struct xt_entry_target *t;
555 unsigned int verdict;
557 if (!unconditional(e))
559 t = arpt_get_target_c(e);
560 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
562 verdict = ((struct xt_standard_target *)t)->verdict;
563 verdict = -verdict - 1;
564 return verdict == NF_DROP || verdict == NF_ACCEPT;
567 static inline int check_entry_size_and_hooks(struct arpt_entry *e,
568 struct xt_table_info *newinfo,
569 const unsigned char *base,
570 const unsigned char *limit,
571 const unsigned int *hook_entries,
572 const unsigned int *underflows,
573 unsigned int valid_hooks)
578 if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 ||
579 (unsigned char *)e + sizeof(struct arpt_entry) >= limit ||
580 (unsigned char *)e + e->next_offset > limit) {
581 duprintf("Bad offset %p\n", e);
586 < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target)) {
587 duprintf("checking: element %p size %u\n",
592 if (!arp_checkentry(&e->arp))
595 err = xt_check_entry_offsets(e, e->target_offset, e->next_offset);
599 /* Check hooks & underflows */
600 for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
601 if (!(valid_hooks & (1 << h)))
603 if ((unsigned char *)e - base == hook_entries[h])
604 newinfo->hook_entry[h] = hook_entries[h];
605 if ((unsigned char *)e - base == underflows[h]) {
606 if (!check_underflow(e)) {
607 pr_debug("Underflows must be unconditional and "
608 "use the STANDARD target with "
612 newinfo->underflow[h] = underflows[h];
616 /* Clear counters and comefrom */
617 e->counters = ((struct xt_counters) { 0, 0 });
622 static inline void cleanup_entry(struct arpt_entry *e)
624 struct xt_tgdtor_param par;
625 struct xt_entry_target *t;
627 t = arpt_get_target(e);
628 par.target = t->u.kernel.target;
629 par.targinfo = t->data;
630 par.family = NFPROTO_ARP;
631 if (par.target->destroy != NULL)
632 par.target->destroy(&par);
633 module_put(par.target->me);
634 xt_percpu_counter_free(e->counters.pcnt);
637 /* Checks and translates the user-supplied table segment (held in
640 static int translate_table(struct xt_table_info *newinfo, void *entry0,
641 const struct arpt_replace *repl)
643 struct arpt_entry *iter;
647 newinfo->size = repl->size;
648 newinfo->number = repl->num_entries;
650 /* Init all hooks to impossible value. */
651 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
652 newinfo->hook_entry[i] = 0xFFFFFFFF;
653 newinfo->underflow[i] = 0xFFFFFFFF;
656 duprintf("translate_table: size %u\n", newinfo->size);
659 /* Walk through entries, checking offsets. */
660 xt_entry_foreach(iter, entry0, newinfo->size) {
661 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
669 if (strcmp(arpt_get_target(iter)->u.user.name,
670 XT_ERROR_TARGET) == 0)
671 ++newinfo->stacksize;
673 duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret);
677 if (i != repl->num_entries) {
678 duprintf("translate_table: %u not %u entries\n",
679 i, repl->num_entries);
683 /* Check hooks all assigned */
684 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
685 /* Only hooks which are valid */
686 if (!(repl->valid_hooks & (1 << i)))
688 if (newinfo->hook_entry[i] == 0xFFFFFFFF) {
689 duprintf("Invalid hook entry %u %u\n",
690 i, repl->hook_entry[i]);
693 if (newinfo->underflow[i] == 0xFFFFFFFF) {
694 duprintf("Invalid underflow %u %u\n",
695 i, repl->underflow[i]);
700 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0))
703 /* Finally, each sanity check must pass */
705 xt_entry_foreach(iter, entry0, newinfo->size) {
706 ret = find_check_entry(iter, repl->name, repl->size);
713 xt_entry_foreach(iter, entry0, newinfo->size) {
724 static void get_counters(const struct xt_table_info *t,
725 struct xt_counters counters[])
727 struct arpt_entry *iter;
731 for_each_possible_cpu(cpu) {
732 seqcount_t *s = &per_cpu(xt_recseq, cpu);
735 xt_entry_foreach(iter, t->entries, t->size) {
736 struct xt_counters *tmp;
740 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
742 start = read_seqcount_begin(s);
745 } while (read_seqcount_retry(s, start));
747 ADD_COUNTER(counters[i], bcnt, pcnt);
753 static struct xt_counters *alloc_counters(const struct xt_table *table)
755 unsigned int countersize;
756 struct xt_counters *counters;
757 const struct xt_table_info *private = table->private;
759 /* We need atomic snapshot of counters: rest doesn't change
760 * (other than comefrom, which userspace doesn't care
763 countersize = sizeof(struct xt_counters) * private->number;
764 counters = vzalloc(countersize);
766 if (counters == NULL)
767 return ERR_PTR(-ENOMEM);
769 get_counters(private, counters);
774 static int copy_entries_to_user(unsigned int total_size,
775 const struct xt_table *table,
776 void __user *userptr)
778 unsigned int off, num;
779 const struct arpt_entry *e;
780 struct xt_counters *counters;
781 struct xt_table_info *private = table->private;
785 counters = alloc_counters(table);
786 if (IS_ERR(counters))
787 return PTR_ERR(counters);
789 loc_cpu_entry = private->entries;
790 /* ... then copy entire thing ... */
791 if (copy_to_user(userptr, loc_cpu_entry, total_size) != 0) {
796 /* FIXME: use iterator macros --RR */
797 /* ... then go back and fix counters and names */
798 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
799 const struct xt_entry_target *t;
801 e = (struct arpt_entry *)(loc_cpu_entry + off);
802 if (copy_to_user(userptr + off
803 + offsetof(struct arpt_entry, counters),
805 sizeof(counters[num])) != 0) {
810 t = arpt_get_target_c(e);
811 if (copy_to_user(userptr + off + e->target_offset
812 + offsetof(struct xt_entry_target,
814 t->u.kernel.target->name,
815 strlen(t->u.kernel.target->name)+1) != 0) {
827 static void compat_standard_from_user(void *dst, const void *src)
829 int v = *(compat_int_t *)src;
832 v += xt_compat_calc_jump(NFPROTO_ARP, v);
833 memcpy(dst, &v, sizeof(v));
836 static int compat_standard_to_user(void __user *dst, const void *src)
838 compat_int_t cv = *(int *)src;
841 cv -= xt_compat_calc_jump(NFPROTO_ARP, cv);
842 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
845 static int compat_calc_entry(const struct arpt_entry *e,
846 const struct xt_table_info *info,
847 const void *base, struct xt_table_info *newinfo)
849 const struct xt_entry_target *t;
850 unsigned int entry_offset;
853 off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
854 entry_offset = (void *)e - base;
856 t = arpt_get_target_c(e);
857 off += xt_compat_target_offset(t->u.kernel.target);
858 newinfo->size -= off;
859 ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
863 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
864 if (info->hook_entry[i] &&
865 (e < (struct arpt_entry *)(base + info->hook_entry[i])))
866 newinfo->hook_entry[i] -= off;
867 if (info->underflow[i] &&
868 (e < (struct arpt_entry *)(base + info->underflow[i])))
869 newinfo->underflow[i] -= off;
874 static int compat_table_info(const struct xt_table_info *info,
875 struct xt_table_info *newinfo)
877 struct arpt_entry *iter;
878 const void *loc_cpu_entry;
881 if (!newinfo || !info)
884 /* we dont care about newinfo->entries */
885 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
886 newinfo->initial_entries = 0;
887 loc_cpu_entry = info->entries;
888 xt_compat_init_offsets(NFPROTO_ARP, info->number);
889 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
890 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
898 static int get_info(struct net *net, void __user *user,
899 const int *len, int compat)
901 char name[XT_TABLE_MAXNAMELEN];
905 if (*len != sizeof(struct arpt_getinfo)) {
906 duprintf("length %u != %Zu\n", *len,
907 sizeof(struct arpt_getinfo));
911 if (copy_from_user(name, user, sizeof(name)) != 0)
914 name[XT_TABLE_MAXNAMELEN-1] = '\0';
917 xt_compat_lock(NFPROTO_ARP);
919 t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
920 "arptable_%s", name);
921 if (!IS_ERR_OR_NULL(t)) {
922 struct arpt_getinfo info;
923 const struct xt_table_info *private = t->private;
925 struct xt_table_info tmp;
928 ret = compat_table_info(private, &tmp);
929 xt_compat_flush_offsets(NFPROTO_ARP);
933 memset(&info, 0, sizeof(info));
934 info.valid_hooks = t->valid_hooks;
935 memcpy(info.hook_entry, private->hook_entry,
936 sizeof(info.hook_entry));
937 memcpy(info.underflow, private->underflow,
938 sizeof(info.underflow));
939 info.num_entries = private->number;
940 info.size = private->size;
941 strcpy(info.name, name);
943 if (copy_to_user(user, &info, *len) != 0)
950 ret = t ? PTR_ERR(t) : -ENOENT;
953 xt_compat_unlock(NFPROTO_ARP);
958 static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
962 struct arpt_get_entries get;
965 if (*len < sizeof(get)) {
966 duprintf("get_entries: %u < %Zu\n", *len, sizeof(get));
969 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
971 if (*len != sizeof(struct arpt_get_entries) + get.size) {
972 duprintf("get_entries: %u != %Zu\n", *len,
973 sizeof(struct arpt_get_entries) + get.size);
977 t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
978 if (!IS_ERR_OR_NULL(t)) {
979 const struct xt_table_info *private = t->private;
981 duprintf("t->private->number = %u\n",
983 if (get.size == private->size)
984 ret = copy_entries_to_user(private->size,
985 t, uptr->entrytable);
987 duprintf("get_entries: I've got %u not %u!\n",
988 private->size, get.size);
994 ret = t ? PTR_ERR(t) : -ENOENT;
999 static int __do_replace(struct net *net, const char *name,
1000 unsigned int valid_hooks,
1001 struct xt_table_info *newinfo,
1002 unsigned int num_counters,
1003 void __user *counters_ptr)
1007 struct xt_table_info *oldinfo;
1008 struct xt_counters *counters;
1009 void *loc_cpu_old_entry;
1010 struct arpt_entry *iter;
1013 counters = vzalloc(num_counters * sizeof(struct xt_counters));
1019 t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
1020 "arptable_%s", name);
1021 if (IS_ERR_OR_NULL(t)) {
1022 ret = t ? PTR_ERR(t) : -ENOENT;
1023 goto free_newinfo_counters_untrans;
1027 if (valid_hooks != t->valid_hooks) {
1028 duprintf("Valid hook crap: %08X vs %08X\n",
1029 valid_hooks, t->valid_hooks);
1034 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
1038 /* Update module usage count based on number of rules */
1039 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1040 oldinfo->number, oldinfo->initial_entries, newinfo->number);
1041 if ((oldinfo->number > oldinfo->initial_entries) ||
1042 (newinfo->number <= oldinfo->initial_entries))
1044 if ((oldinfo->number > oldinfo->initial_entries) &&
1045 (newinfo->number <= oldinfo->initial_entries))
1048 /* Get the old counters, and synchronize with replace */
1049 get_counters(oldinfo, counters);
1051 /* Decrease module usage counts and free resource */
1052 loc_cpu_old_entry = oldinfo->entries;
1053 xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
1054 cleanup_entry(iter);
1056 xt_free_table_info(oldinfo);
1057 if (copy_to_user(counters_ptr, counters,
1058 sizeof(struct xt_counters) * num_counters) != 0) {
1059 /* Silent error, can't fail, new table is already in place */
1060 net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n");
1069 free_newinfo_counters_untrans:
1075 static int do_replace(struct net *net, const void __user *user,
1079 struct arpt_replace tmp;
1080 struct xt_table_info *newinfo;
1081 void *loc_cpu_entry;
1082 struct arpt_entry *iter;
1084 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1087 /* overflow check */
1088 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1090 if (tmp.num_counters == 0)
1093 tmp.name[sizeof(tmp.name)-1] = 0;
1095 newinfo = xt_alloc_table_info(tmp.size);
1099 loc_cpu_entry = newinfo->entries;
1100 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp),
1106 ret = translate_table(newinfo, loc_cpu_entry, &tmp);
1110 duprintf("arp_tables: Translated table\n");
1112 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1113 tmp.num_counters, tmp.counters);
1115 goto free_newinfo_untrans;
1118 free_newinfo_untrans:
1119 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1120 cleanup_entry(iter);
1122 xt_free_table_info(newinfo);
1126 static int do_add_counters(struct net *net, const void __user *user,
1127 unsigned int len, int compat)
1130 struct xt_counters_info tmp;
1131 struct xt_counters *paddc;
1132 unsigned int num_counters;
1137 const struct xt_table_info *private;
1139 struct arpt_entry *iter;
1140 unsigned int addend;
1141 #ifdef CONFIG_COMPAT
1142 struct compat_xt_counters_info compat_tmp;
1146 size = sizeof(struct compat_xt_counters_info);
1151 size = sizeof(struct xt_counters_info);
1154 if (copy_from_user(ptmp, user, size) != 0)
1157 #ifdef CONFIG_COMPAT
1159 num_counters = compat_tmp.num_counters;
1160 name = compat_tmp.name;
1164 num_counters = tmp.num_counters;
1168 if (len != size + num_counters * sizeof(struct xt_counters))
1171 paddc = vmalloc(len - size);
1175 if (copy_from_user(paddc, user + size, len - size) != 0) {
1180 t = xt_find_table_lock(net, NFPROTO_ARP, name);
1181 if (IS_ERR_OR_NULL(t)) {
1182 ret = t ? PTR_ERR(t) : -ENOENT;
1187 private = t->private;
1188 if (private->number != num_counters) {
1190 goto unlock_up_free;
1195 addend = xt_write_recseq_begin();
1196 xt_entry_foreach(iter, private->entries, private->size) {
1197 struct xt_counters *tmp;
1199 tmp = xt_get_this_cpu_counter(&iter->counters);
1200 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1203 xt_write_recseq_end(addend);
1214 #ifdef CONFIG_COMPAT
1215 static inline void compat_release_entry(struct compat_arpt_entry *e)
1217 struct xt_entry_target *t;
1219 t = compat_arpt_get_target(e);
1220 module_put(t->u.kernel.target->me);
1224 check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
1225 struct xt_table_info *newinfo,
1227 const unsigned char *base,
1228 const unsigned char *limit,
1229 const unsigned int *hook_entries,
1230 const unsigned int *underflows,
1233 struct xt_entry_target *t;
1234 struct xt_target *target;
1235 unsigned int entry_offset;
1238 duprintf("check_compat_entry_size_and_hooks %p\n", e);
1239 if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 ||
1240 (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit ||
1241 (unsigned char *)e + e->next_offset > limit) {
1242 duprintf("Bad offset %p, limit = %p\n", e, limit);
1246 if (e->next_offset < sizeof(struct compat_arpt_entry) +
1247 sizeof(struct compat_xt_entry_target)) {
1248 duprintf("checking: element %p size %u\n",
1253 if (!arp_checkentry(&e->arp))
1256 ret = xt_compat_check_entry_offsets(e, e->target_offset,
1261 off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1262 entry_offset = (void *)e - (void *)base;
1264 t = compat_arpt_get_target(e);
1265 target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
1266 t->u.user.revision);
1267 if (IS_ERR(target)) {
1268 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1270 ret = PTR_ERR(target);
1273 t->u.kernel.target = target;
1275 off += xt_compat_target_offset(target);
1277 ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
1279 goto release_target;
1281 /* Check hooks & underflows */
1282 for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
1283 if ((unsigned char *)e - base == hook_entries[h])
1284 newinfo->hook_entry[h] = hook_entries[h];
1285 if ((unsigned char *)e - base == underflows[h])
1286 newinfo->underflow[h] = underflows[h];
1289 /* Clear counters and comefrom */
1290 memset(&e->counters, 0, sizeof(e->counters));
1295 module_put(t->u.kernel.target->me);
1301 compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
1302 unsigned int *size, const char *name,
1303 struct xt_table_info *newinfo, unsigned char *base)
1305 struct xt_entry_target *t;
1306 struct xt_target *target;
1307 struct arpt_entry *de;
1308 unsigned int origsize;
1313 de = (struct arpt_entry *)*dstptr;
1314 memcpy(de, e, sizeof(struct arpt_entry));
1315 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1317 *dstptr += sizeof(struct arpt_entry);
1318 *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1320 de->target_offset = e->target_offset - (origsize - *size);
1321 t = compat_arpt_get_target(e);
1322 target = t->u.kernel.target;
1323 xt_compat_target_from_user(t, dstptr, size);
1325 de->next_offset = e->next_offset - (origsize - *size);
1326 for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
1327 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1328 newinfo->hook_entry[h] -= origsize - *size;
1329 if ((unsigned char *)de - base < newinfo->underflow[h])
1330 newinfo->underflow[h] -= origsize - *size;
1335 static int translate_compat_table(const char *name,
1336 unsigned int valid_hooks,
1337 struct xt_table_info **pinfo,
1339 unsigned int total_size,
1340 unsigned int number,
1341 unsigned int *hook_entries,
1342 unsigned int *underflows)
1345 struct xt_table_info *newinfo, *info;
1346 void *pos, *entry0, *entry1;
1347 struct compat_arpt_entry *iter0;
1348 struct arpt_entry *iter1;
1355 info->number = number;
1357 /* Init all hooks to impossible value. */
1358 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
1359 info->hook_entry[i] = 0xFFFFFFFF;
1360 info->underflow[i] = 0xFFFFFFFF;
1363 duprintf("translate_compat_table: size %u\n", info->size);
1365 xt_compat_lock(NFPROTO_ARP);
1366 xt_compat_init_offsets(NFPROTO_ARP, number);
1367 /* Walk through entries, checking offsets. */
1368 xt_entry_foreach(iter0, entry0, total_size) {
1369 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1371 entry0 + total_size,
1382 duprintf("translate_compat_table: %u not %u entries\n",
1387 /* Check hooks all assigned */
1388 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
1389 /* Only hooks which are valid */
1390 if (!(valid_hooks & (1 << i)))
1392 if (info->hook_entry[i] == 0xFFFFFFFF) {
1393 duprintf("Invalid hook entry %u %u\n",
1394 i, hook_entries[i]);
1397 if (info->underflow[i] == 0xFFFFFFFF) {
1398 duprintf("Invalid underflow %u %u\n",
1405 newinfo = xt_alloc_table_info(size);
1409 newinfo->number = number;
1410 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
1411 newinfo->hook_entry[i] = info->hook_entry[i];
1412 newinfo->underflow[i] = info->underflow[i];
1414 entry1 = newinfo->entries;
1417 xt_entry_foreach(iter0, entry0, total_size) {
1418 ret = compat_copy_entry_from_user(iter0, &pos, &size,
1419 name, newinfo, entry1);
1423 xt_compat_flush_offsets(NFPROTO_ARP);
1424 xt_compat_unlock(NFPROTO_ARP);
1429 if (!mark_source_chains(newinfo, valid_hooks, entry1))
1433 xt_entry_foreach(iter1, entry1, newinfo->size) {
1434 iter1->counters.pcnt = xt_percpu_counter_alloc();
1435 if (IS_ERR_VALUE(iter1->counters.pcnt)) {
1440 ret = check_target(iter1, name);
1442 xt_percpu_counter_free(iter1->counters.pcnt);
1446 if (strcmp(arpt_get_target(iter1)->u.user.name,
1447 XT_ERROR_TARGET) == 0)
1448 ++newinfo->stacksize;
1452 * The first i matches need cleanup_entry (calls ->destroy)
1453 * because they had called ->check already. The other j-i
1454 * entries need only release.
1458 xt_entry_foreach(iter0, entry0, newinfo->size) {
1463 compat_release_entry(iter0);
1465 xt_entry_foreach(iter1, entry1, newinfo->size) {
1468 cleanup_entry(iter1);
1470 xt_free_table_info(newinfo);
1476 xt_free_table_info(info);
1480 xt_free_table_info(newinfo);
1482 xt_entry_foreach(iter0, entry0, total_size) {
1485 compat_release_entry(iter0);
1489 xt_compat_flush_offsets(NFPROTO_ARP);
1490 xt_compat_unlock(NFPROTO_ARP);
1494 struct compat_arpt_replace {
1495 char name[XT_TABLE_MAXNAMELEN];
1499 u32 hook_entry[NF_ARP_NUMHOOKS];
1500 u32 underflow[NF_ARP_NUMHOOKS];
1502 compat_uptr_t counters;
1503 struct compat_arpt_entry entries[0];
1506 static int compat_do_replace(struct net *net, void __user *user,
1510 struct compat_arpt_replace tmp;
1511 struct xt_table_info *newinfo;
1512 void *loc_cpu_entry;
1513 struct arpt_entry *iter;
1515 if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
1518 /* overflow check */
1519 if (tmp.size >= INT_MAX / num_possible_cpus())
1521 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1523 if (tmp.num_counters == 0)
1526 tmp.name[sizeof(tmp.name)-1] = 0;
1528 newinfo = xt_alloc_table_info(tmp.size);
1532 loc_cpu_entry = newinfo->entries;
1533 if (copy_from_user(loc_cpu_entry, user + sizeof(tmp), tmp.size) != 0) {
1538 ret = translate_compat_table(tmp.name, tmp.valid_hooks,
1539 &newinfo, &loc_cpu_entry, tmp.size,
1540 tmp.num_entries, tmp.hook_entry,
1545 duprintf("compat_do_replace: Translated table\n");
1547 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1548 tmp.num_counters, compat_ptr(tmp.counters));
1550 goto free_newinfo_untrans;
1553 free_newinfo_untrans:
1554 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1555 cleanup_entry(iter);
1557 xt_free_table_info(newinfo);
1561 static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user,
1566 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1570 case ARPT_SO_SET_REPLACE:
1571 ret = compat_do_replace(sock_net(sk), user, len);
1574 case ARPT_SO_SET_ADD_COUNTERS:
1575 ret = do_add_counters(sock_net(sk), user, len, 1);
1579 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd);
1586 static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr,
1587 compat_uint_t *size,
1588 struct xt_counters *counters,
1591 struct xt_entry_target *t;
1592 struct compat_arpt_entry __user *ce;
1593 u_int16_t target_offset, next_offset;
1594 compat_uint_t origsize;
1598 ce = (struct compat_arpt_entry __user *)*dstptr;
1599 if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 ||
1600 copy_to_user(&ce->counters, &counters[i],
1601 sizeof(counters[i])) != 0)
1604 *dstptr += sizeof(struct compat_arpt_entry);
1605 *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1607 target_offset = e->target_offset - (origsize - *size);
1609 t = arpt_get_target(e);
1610 ret = xt_compat_target_to_user(t, dstptr, size);
1613 next_offset = e->next_offset - (origsize - *size);
1614 if (put_user(target_offset, &ce->target_offset) != 0 ||
1615 put_user(next_offset, &ce->next_offset) != 0)
1620 static int compat_copy_entries_to_user(unsigned int total_size,
1621 struct xt_table *table,
1622 void __user *userptr)
1624 struct xt_counters *counters;
1625 const struct xt_table_info *private = table->private;
1630 struct arpt_entry *iter;
1632 counters = alloc_counters(table);
1633 if (IS_ERR(counters))
1634 return PTR_ERR(counters);
1638 xt_entry_foreach(iter, private->entries, total_size) {
1639 ret = compat_copy_entry_to_user(iter, &pos,
1640 &size, counters, i++);
1648 struct compat_arpt_get_entries {
1649 char name[XT_TABLE_MAXNAMELEN];
1651 struct compat_arpt_entry entrytable[0];
1654 static int compat_get_entries(struct net *net,
1655 struct compat_arpt_get_entries __user *uptr,
1659 struct compat_arpt_get_entries get;
1662 if (*len < sizeof(get)) {
1663 duprintf("compat_get_entries: %u < %zu\n", *len, sizeof(get));
1666 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1668 if (*len != sizeof(struct compat_arpt_get_entries) + get.size) {
1669 duprintf("compat_get_entries: %u != %zu\n",
1670 *len, sizeof(get) + get.size);
1674 xt_compat_lock(NFPROTO_ARP);
1675 t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
1676 if (!IS_ERR_OR_NULL(t)) {
1677 const struct xt_table_info *private = t->private;
1678 struct xt_table_info info;
1680 duprintf("t->private->number = %u\n", private->number);
1681 ret = compat_table_info(private, &info);
1682 if (!ret && get.size == info.size) {
1683 ret = compat_copy_entries_to_user(private->size,
1684 t, uptr->entrytable);
1686 duprintf("compat_get_entries: I've got %u not %u!\n",
1687 private->size, get.size);
1690 xt_compat_flush_offsets(NFPROTO_ARP);
1694 ret = t ? PTR_ERR(t) : -ENOENT;
1696 xt_compat_unlock(NFPROTO_ARP);
1700 static int do_arpt_get_ctl(struct sock *, int, void __user *, int *);
1702 static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
1707 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1711 case ARPT_SO_GET_INFO:
1712 ret = get_info(sock_net(sk), user, len, 1);
1714 case ARPT_SO_GET_ENTRIES:
1715 ret = compat_get_entries(sock_net(sk), user, len);
1718 ret = do_arpt_get_ctl(sk, cmd, user, len);
1724 static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1728 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1732 case ARPT_SO_SET_REPLACE:
1733 ret = do_replace(sock_net(sk), user, len);
1736 case ARPT_SO_SET_ADD_COUNTERS:
1737 ret = do_add_counters(sock_net(sk), user, len, 0);
1741 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd);
1748 static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1752 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1756 case ARPT_SO_GET_INFO:
1757 ret = get_info(sock_net(sk), user, len, 0);
1760 case ARPT_SO_GET_ENTRIES:
1761 ret = get_entries(sock_net(sk), user, len);
1764 case ARPT_SO_GET_REVISION_TARGET: {
1765 struct xt_get_revision rev;
1767 if (*len != sizeof(rev)) {
1771 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1775 rev.name[sizeof(rev.name)-1] = 0;
1777 try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name,
1778 rev.revision, 1, &ret),
1779 "arpt_%s", rev.name);
1784 duprintf("do_arpt_get_ctl: unknown request %i\n", cmd);
1791 struct xt_table *arpt_register_table(struct net *net,
1792 const struct xt_table *table,
1793 const struct arpt_replace *repl)
1796 struct xt_table_info *newinfo;
1797 struct xt_table_info bootstrap = {0};
1798 void *loc_cpu_entry;
1799 struct xt_table *new_table;
1801 newinfo = xt_alloc_table_info(repl->size);
1807 loc_cpu_entry = newinfo->entries;
1808 memcpy(loc_cpu_entry, repl->entries, repl->size);
1810 ret = translate_table(newinfo, loc_cpu_entry, repl);
1811 duprintf("arpt_register_table: translate table gives %d\n", ret);
1815 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1816 if (IS_ERR(new_table)) {
1817 ret = PTR_ERR(new_table);
1823 xt_free_table_info(newinfo);
1825 return ERR_PTR(ret);
1828 void arpt_unregister_table(struct xt_table *table)
1830 struct xt_table_info *private;
1831 void *loc_cpu_entry;
1832 struct module *table_owner = table->me;
1833 struct arpt_entry *iter;
1835 private = xt_unregister_table(table);
1837 /* Decrease module usage counts and free resources */
1838 loc_cpu_entry = private->entries;
1839 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1840 cleanup_entry(iter);
1841 if (private->number > private->initial_entries)
1842 module_put(table_owner);
1843 xt_free_table_info(private);
1846 /* The built-in targets: standard (NULL) and error. */
1847 static struct xt_target arpt_builtin_tg[] __read_mostly = {
1849 .name = XT_STANDARD_TARGET,
1850 .targetsize = sizeof(int),
1851 .family = NFPROTO_ARP,
1852 #ifdef CONFIG_COMPAT
1853 .compatsize = sizeof(compat_int_t),
1854 .compat_from_user = compat_standard_from_user,
1855 .compat_to_user = compat_standard_to_user,
1859 .name = XT_ERROR_TARGET,
1860 .target = arpt_error,
1861 .targetsize = XT_FUNCTION_MAXNAMELEN,
1862 .family = NFPROTO_ARP,
1866 static struct nf_sockopt_ops arpt_sockopts = {
1868 .set_optmin = ARPT_BASE_CTL,
1869 .set_optmax = ARPT_SO_SET_MAX+1,
1870 .set = do_arpt_set_ctl,
1871 #ifdef CONFIG_COMPAT
1872 .compat_set = compat_do_arpt_set_ctl,
1874 .get_optmin = ARPT_BASE_CTL,
1875 .get_optmax = ARPT_SO_GET_MAX+1,
1876 .get = do_arpt_get_ctl,
1877 #ifdef CONFIG_COMPAT
1878 .compat_get = compat_do_arpt_get_ctl,
1880 .owner = THIS_MODULE,
1883 static int __net_init arp_tables_net_init(struct net *net)
1885 return xt_proto_init(net, NFPROTO_ARP);
1888 static void __net_exit arp_tables_net_exit(struct net *net)
1890 xt_proto_fini(net, NFPROTO_ARP);
1893 static struct pernet_operations arp_tables_net_ops = {
1894 .init = arp_tables_net_init,
1895 .exit = arp_tables_net_exit,
1898 static int __init arp_tables_init(void)
1902 ret = register_pernet_subsys(&arp_tables_net_ops);
1906 /* No one else will be downing sem now, so we won't sleep */
1907 ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1911 /* Register setsockopt */
1912 ret = nf_register_sockopt(&arpt_sockopts);
1916 printk(KERN_INFO "arp_tables: (C) 2002 David S. Miller\n");
1920 xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1922 unregister_pernet_subsys(&arp_tables_net_ops);
1927 static void __exit arp_tables_fini(void)
1929 nf_unregister_sockopt(&arpt_sockopts);
1930 xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1931 unregister_pernet_subsys(&arp_tables_net_ops);
1934 EXPORT_SYMBOL(arpt_register_table);
1935 EXPORT_SYMBOL(arpt_unregister_table);
1936 EXPORT_SYMBOL(arpt_do_table);
1938 module_init(arp_tables_init);
1939 module_exit(arp_tables_fini);