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13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/netdevice.h>
17#include <linux/capability.h>
18#include <linux/if_arp.h>
19#include <linux/kmod.h>
20#include <linux/vmalloc.h>
21#include <linux/proc_fs.h>
22#include <linux/module.h>
23#include <linux/init.h>
24#include <linux/mutex.h>
25#include <linux/err.h>
26#include <net/compat.h>
27#include <net/sock.h>
28#include <linux/uaccess.h>
29
30#include <linux/netfilter/x_tables.h>
31#include <linux/netfilter_arp/arp_tables.h>
32#include "../../netfilter/xt_repldata.h"
33
34MODULE_LICENSE("GPL");
35MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
36MODULE_DESCRIPTION("arptables core");
37
38void *arpt_alloc_initial_table(const struct xt_table *info)
39{
40 return xt_alloc_initial_table(arpt, ARPT);
41}
42EXPORT_SYMBOL_GPL(arpt_alloc_initial_table);
43
44static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
45 const char *hdr_addr, int len)
46{
47 int i, ret;
48
49 if (len > ARPT_DEV_ADDR_LEN_MAX)
50 len = ARPT_DEV_ADDR_LEN_MAX;
51
52 ret = 0;
53 for (i = 0; i < len; i++)
54 ret |= (hdr_addr[i] ^ ap->addr[i]) & ap->mask[i];
55
56 return ret != 0;
57}
58
59
60
61
62
63
64static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
65{
66#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
67 unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
68#else
69 unsigned long ret = 0;
70 const u16 *a = (const u16 *)_a;
71 const u16 *b = (const u16 *)_b;
72 const u16 *mask = (const u16 *)_mask;
73 int i;
74
75 for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
76 ret |= (a[i] ^ b[i]) & mask[i];
77#endif
78 return ret;
79}
80
81
82static inline int arp_packet_match(const struct arphdr *arphdr,
83 struct net_device *dev,
84 const char *indev,
85 const char *outdev,
86 const struct arpt_arp *arpinfo)
87{
88 const char *arpptr = (char *)(arphdr + 1);
89 const char *src_devaddr, *tgt_devaddr;
90 __be32 src_ipaddr, tgt_ipaddr;
91 long ret;
92
93 if (NF_INVF(arpinfo, ARPT_INV_ARPOP,
94 (arphdr->ar_op & arpinfo->arpop_mask) != arpinfo->arpop))
95 return 0;
96
97 if (NF_INVF(arpinfo, ARPT_INV_ARPHRD,
98 (arphdr->ar_hrd & arpinfo->arhrd_mask) != arpinfo->arhrd))
99 return 0;
100
101 if (NF_INVF(arpinfo, ARPT_INV_ARPPRO,
102 (arphdr->ar_pro & arpinfo->arpro_mask) != arpinfo->arpro))
103 return 0;
104
105 if (NF_INVF(arpinfo, ARPT_INV_ARPHLN,
106 (arphdr->ar_hln & arpinfo->arhln_mask) != arpinfo->arhln))
107 return 0;
108
109 src_devaddr = arpptr;
110 arpptr += dev->addr_len;
111 memcpy(&src_ipaddr, arpptr, sizeof(u32));
112 arpptr += sizeof(u32);
113 tgt_devaddr = arpptr;
114 arpptr += dev->addr_len;
115 memcpy(&tgt_ipaddr, arpptr, sizeof(u32));
116
117 if (NF_INVF(arpinfo, ARPT_INV_SRCDEVADDR,
118 arp_devaddr_compare(&arpinfo->src_devaddr, src_devaddr,
119 dev->addr_len)) ||
120 NF_INVF(arpinfo, ARPT_INV_TGTDEVADDR,
121 arp_devaddr_compare(&arpinfo->tgt_devaddr, tgt_devaddr,
122 dev->addr_len)))
123 return 0;
124
125 if (NF_INVF(arpinfo, ARPT_INV_SRCIP,
126 (src_ipaddr & arpinfo->smsk.s_addr) != arpinfo->src.s_addr) ||
127 NF_INVF(arpinfo, ARPT_INV_TGTIP,
128 (tgt_ipaddr & arpinfo->tmsk.s_addr) != arpinfo->tgt.s_addr))
129 return 0;
130
131
132 ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask);
133
134 if (NF_INVF(arpinfo, ARPT_INV_VIA_IN, ret != 0))
135 return 0;
136
137 ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask);
138
139 if (NF_INVF(arpinfo, ARPT_INV_VIA_OUT, ret != 0))
140 return 0;
141
142 return 1;
143}
144
145static inline int arp_checkentry(const struct arpt_arp *arp)
146{
147 if (arp->flags & ~ARPT_F_MASK)
148 return 0;
149 if (arp->invflags & ~ARPT_INV_MASK)
150 return 0;
151
152 return 1;
153}
154
155static unsigned int
156arpt_error(struct sk_buff *skb, const struct xt_action_param *par)
157{
158 net_err_ratelimited("arp_tables: error: '%s'\n",
159 (const char *)par->targinfo);
160
161 return NF_DROP;
162}
163
164static inline const struct xt_entry_target *
165arpt_get_target_c(const struct arpt_entry *e)
166{
167 return arpt_get_target((struct arpt_entry *)e);
168}
169
170static inline struct arpt_entry *
171get_entry(const void *base, unsigned int offset)
172{
173 return (struct arpt_entry *)(base + offset);
174}
175
176static inline
177struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
178{
179 return (void *)entry + entry->next_offset;
180}
181
182unsigned int arpt_do_table(void *priv,
183 struct sk_buff *skb,
184 const struct nf_hook_state *state)
185{
186 const struct xt_table *table = priv;
187 unsigned int hook = state->hook;
188 static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
189 unsigned int verdict = NF_DROP;
190 const struct arphdr *arp;
191 struct arpt_entry *e, **jumpstack;
192 const char *indev, *outdev;
193 const void *table_base;
194 unsigned int cpu, stackidx = 0;
195 const struct xt_table_info *private;
196 struct xt_action_param acpar;
197 unsigned int addend;
198
199 if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
200 return NF_DROP;
201
202 indev = state->in ? state->in->name : nulldevname;
203 outdev = state->out ? state->out->name : nulldevname;
204
205 local_bh_disable();
206 addend = xt_write_recseq_begin();
207 private = READ_ONCE(table->private);
208 cpu = smp_processor_id();
209 table_base = private->entries;
210 jumpstack = (struct arpt_entry **)private->jumpstack[cpu];
211
212
213
214
215 e = get_entry(table_base, private->hook_entry[hook]);
216
217 acpar.state = state;
218 acpar.hotdrop = false;
219
220 arp = arp_hdr(skb);
221 do {
222 const struct xt_entry_target *t;
223 struct xt_counters *counter;
224
225 if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
226 e = arpt_next_entry(e);
227 continue;
228 }
229
230 counter = xt_get_this_cpu_counter(&e->counters);
231 ADD_COUNTER(*counter, arp_hdr_len(skb->dev), 1);
232
233 t = arpt_get_target_c(e);
234
235
236 if (!t->u.kernel.target->target) {
237 int v;
238
239 v = ((struct xt_standard_target *)t)->verdict;
240 if (v < 0) {
241
242 if (v != XT_RETURN) {
243 verdict = (unsigned int)(-v) - 1;
244 break;
245 }
246 if (stackidx == 0) {
247 e = get_entry(table_base,
248 private->underflow[hook]);
249 } else {
250 e = jumpstack[--stackidx];
251 e = arpt_next_entry(e);
252 }
253 continue;
254 }
255 if (table_base + v
256 != arpt_next_entry(e)) {
257 if (unlikely(stackidx >= private->stacksize)) {
258 verdict = NF_DROP;
259 break;
260 }
261 jumpstack[stackidx++] = e;
262 }
263
264 e = get_entry(table_base, v);
265 continue;
266 }
267
268 acpar.target = t->u.kernel.target;
269 acpar.targinfo = t->data;
270 verdict = t->u.kernel.target->target(skb, &acpar);
271
272 if (verdict == XT_CONTINUE) {
273
274 arp = arp_hdr(skb);
275 e = arpt_next_entry(e);
276 } else {
277
278 break;
279 }
280 } while (!acpar.hotdrop);
281 xt_write_recseq_end(addend);
282 local_bh_enable();
283
284 if (acpar.hotdrop)
285 return NF_DROP;
286 else
287 return verdict;
288}
289
290
291static inline bool unconditional(const struct arpt_entry *e)
292{
293 static const struct arpt_arp uncond;
294
295 return e->target_offset == sizeof(struct arpt_entry) &&
296 memcmp(&e->arp, &uncond, sizeof(uncond)) == 0;
297}
298
299
300
301
302static int mark_source_chains(const struct xt_table_info *newinfo,
303 unsigned int valid_hooks, void *entry0,
304 unsigned int *offsets)
305{
306 unsigned int hook;
307
308
309
310
311 for (hook = 0; hook < NF_ARP_NUMHOOKS; hook++) {
312 unsigned int pos = newinfo->hook_entry[hook];
313 struct arpt_entry *e = entry0 + pos;
314
315 if (!(valid_hooks & (1 << hook)))
316 continue;
317
318
319 e->counters.pcnt = pos;
320
321 for (;;) {
322 const struct xt_standard_target *t
323 = (void *)arpt_get_target_c(e);
324 int visited = e->comefrom & (1 << hook);
325
326 if (e->comefrom & (1 << NF_ARP_NUMHOOKS))
327 return 0;
328
329 e->comefrom
330 |= ((1 << hook) | (1 << NF_ARP_NUMHOOKS));
331
332
333 if ((unconditional(e) &&
334 (strcmp(t->target.u.user.name,
335 XT_STANDARD_TARGET) == 0) &&
336 t->verdict < 0) || visited) {
337 unsigned int oldpos, size;
338
339
340
341
342 do {
343 e->comefrom ^= (1<<NF_ARP_NUMHOOKS);
344 oldpos = pos;
345 pos = e->counters.pcnt;
346 e->counters.pcnt = 0;
347
348
349 if (pos == oldpos)
350 goto next;
351
352 e = entry0 + pos;
353 } while (oldpos == pos + e->next_offset);
354
355
356 size = e->next_offset;
357 e = entry0 + pos + size;
358 if (pos + size >= newinfo->size)
359 return 0;
360 e->counters.pcnt = pos;
361 pos += size;
362 } else {
363 int newpos = t->verdict;
364
365 if (strcmp(t->target.u.user.name,
366 XT_STANDARD_TARGET) == 0 &&
367 newpos >= 0) {
368
369 if (!xt_find_jump_offset(offsets, newpos,
370 newinfo->number))
371 return 0;
372 } else {
373
374 newpos = pos + e->next_offset;
375 if (newpos >= newinfo->size)
376 return 0;
377 }
378 e = entry0 + newpos;
379 e->counters.pcnt = pos;
380 pos = newpos;
381 }
382 }
383next: ;
384 }
385 return 1;
386}
387
388static int check_target(struct arpt_entry *e, struct net *net, const char *name)
389{
390 struct xt_entry_target *t = arpt_get_target(e);
391 struct xt_tgchk_param par = {
392 .net = net,
393 .table = name,
394 .entryinfo = e,
395 .target = t->u.kernel.target,
396 .targinfo = t->data,
397 .hook_mask = e->comefrom,
398 .family = NFPROTO_ARP,
399 };
400
401 return xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
402}
403
404static int
405find_check_entry(struct arpt_entry *e, struct net *net, const char *name,
406 unsigned int size,
407 struct xt_percpu_counter_alloc_state *alloc_state)
408{
409 struct xt_entry_target *t;
410 struct xt_target *target;
411 int ret;
412
413 if (!xt_percpu_counter_alloc(alloc_state, &e->counters))
414 return -ENOMEM;
415
416 t = arpt_get_target(e);
417 target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
418 t->u.user.revision);
419 if (IS_ERR(target)) {
420 ret = PTR_ERR(target);
421 goto out;
422 }
423 t->u.kernel.target = target;
424
425 ret = check_target(e, net, name);
426 if (ret)
427 goto err;
428 return 0;
429err:
430 module_put(t->u.kernel.target->me);
431out:
432 xt_percpu_counter_free(&e->counters);
433
434 return ret;
435}
436
437static bool check_underflow(const struct arpt_entry *e)
438{
439 const struct xt_entry_target *t;
440 unsigned int verdict;
441
442 if (!unconditional(e))
443 return false;
444 t = arpt_get_target_c(e);
445 if (strcmp(t->u.user.name, XT_STANDARD_TARGET) != 0)
446 return false;
447 verdict = ((struct xt_standard_target *)t)->verdict;
448 verdict = -verdict - 1;
449 return verdict == NF_DROP || verdict == NF_ACCEPT;
450}
451
452static inline int check_entry_size_and_hooks(struct arpt_entry *e,
453 struct xt_table_info *newinfo,
454 const unsigned char *base,
455 const unsigned char *limit,
456 const unsigned int *hook_entries,
457 const unsigned int *underflows,
458 unsigned int valid_hooks)
459{
460 unsigned int h;
461 int err;
462
463 if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 ||
464 (unsigned char *)e + sizeof(struct arpt_entry) >= limit ||
465 (unsigned char *)e + e->next_offset > limit)
466 return -EINVAL;
467
468 if (e->next_offset
469 < sizeof(struct arpt_entry) + sizeof(struct xt_entry_target))
470 return -EINVAL;
471
472 if (!arp_checkentry(&e->arp))
473 return -EINVAL;
474
475 err = xt_check_entry_offsets(e, e->elems, e->target_offset,
476 e->next_offset);
477 if (err)
478 return err;
479
480
481 for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
482 if (!(valid_hooks & (1 << h)))
483 continue;
484 if ((unsigned char *)e - base == hook_entries[h])
485 newinfo->hook_entry[h] = hook_entries[h];
486 if ((unsigned char *)e - base == underflows[h]) {
487 if (!check_underflow(e))
488 return -EINVAL;
489
490 newinfo->underflow[h] = underflows[h];
491 }
492 }
493
494
495 e->counters = ((struct xt_counters) { 0, 0 });
496 e->comefrom = 0;
497 return 0;
498}
499
500static void cleanup_entry(struct arpt_entry *e, struct net *net)
501{
502 struct xt_tgdtor_param par;
503 struct xt_entry_target *t;
504
505 t = arpt_get_target(e);
506 par.net = net;
507 par.target = t->u.kernel.target;
508 par.targinfo = t->data;
509 par.family = NFPROTO_ARP;
510 if (par.target->destroy != NULL)
511 par.target->destroy(&par);
512 module_put(par.target->me);
513 xt_percpu_counter_free(&e->counters);
514}
515
516
517
518
519static int translate_table(struct net *net,
520 struct xt_table_info *newinfo,
521 void *entry0,
522 const struct arpt_replace *repl)
523{
524 struct xt_percpu_counter_alloc_state alloc_state = { 0 };
525 struct arpt_entry *iter;
526 unsigned int *offsets;
527 unsigned int i;
528 int ret = 0;
529
530 newinfo->size = repl->size;
531 newinfo->number = repl->num_entries;
532
533
534 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
535 newinfo->hook_entry[i] = 0xFFFFFFFF;
536 newinfo->underflow[i] = 0xFFFFFFFF;
537 }
538
539 offsets = xt_alloc_entry_offsets(newinfo->number);
540 if (!offsets)
541 return -ENOMEM;
542 i = 0;
543
544
545 xt_entry_foreach(iter, entry0, newinfo->size) {
546 ret = check_entry_size_and_hooks(iter, newinfo, entry0,
547 entry0 + repl->size,
548 repl->hook_entry,
549 repl->underflow,
550 repl->valid_hooks);
551 if (ret != 0)
552 goto out_free;
553 if (i < repl->num_entries)
554 offsets[i] = (void *)iter - entry0;
555 ++i;
556 if (strcmp(arpt_get_target(iter)->u.user.name,
557 XT_ERROR_TARGET) == 0)
558 ++newinfo->stacksize;
559 }
560
561 ret = -EINVAL;
562 if (i != repl->num_entries)
563 goto out_free;
564
565 ret = xt_check_table_hooks(newinfo, repl->valid_hooks);
566 if (ret)
567 goto out_free;
568
569 if (!mark_source_chains(newinfo, repl->valid_hooks, entry0, offsets)) {
570 ret = -ELOOP;
571 goto out_free;
572 }
573 kvfree(offsets);
574
575
576 i = 0;
577 xt_entry_foreach(iter, entry0, newinfo->size) {
578 ret = find_check_entry(iter, net, repl->name, repl->size,
579 &alloc_state);
580 if (ret != 0)
581 break;
582 ++i;
583 }
584
585 if (ret != 0) {
586 xt_entry_foreach(iter, entry0, newinfo->size) {
587 if (i-- == 0)
588 break;
589 cleanup_entry(iter, net);
590 }
591 return ret;
592 }
593
594 return ret;
595 out_free:
596 kvfree(offsets);
597 return ret;
598}
599
600static void get_counters(const struct xt_table_info *t,
601 struct xt_counters counters[])
602{
603 struct arpt_entry *iter;
604 unsigned int cpu;
605 unsigned int i;
606
607 for_each_possible_cpu(cpu) {
608 seqcount_t *s = &per_cpu(xt_recseq, cpu);
609
610 i = 0;
611 xt_entry_foreach(iter, t->entries, t->size) {
612 struct xt_counters *tmp;
613 u64 bcnt, pcnt;
614 unsigned int start;
615
616 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
617 do {
618 start = read_seqcount_begin(s);
619 bcnt = tmp->bcnt;
620 pcnt = tmp->pcnt;
621 } while (read_seqcount_retry(s, start));
622
623 ADD_COUNTER(counters[i], bcnt, pcnt);
624 ++i;
625 cond_resched();
626 }
627 }
628}
629
630static void get_old_counters(const struct xt_table_info *t,
631 struct xt_counters counters[])
632{
633 struct arpt_entry *iter;
634 unsigned int cpu, i;
635
636 for_each_possible_cpu(cpu) {
637 i = 0;
638 xt_entry_foreach(iter, t->entries, t->size) {
639 struct xt_counters *tmp;
640
641 tmp = xt_get_per_cpu_counter(&iter->counters, cpu);
642 ADD_COUNTER(counters[i], tmp->bcnt, tmp->pcnt);
643 ++i;
644 }
645 cond_resched();
646 }
647}
648
649static struct xt_counters *alloc_counters(const struct xt_table *table)
650{
651 unsigned int countersize;
652 struct xt_counters *counters;
653 const struct xt_table_info *private = table->private;
654
655
656
657
658
659 countersize = sizeof(struct xt_counters) * private->number;
660 counters = vzalloc(countersize);
661
662 if (counters == NULL)
663 return ERR_PTR(-ENOMEM);
664
665 get_counters(private, counters);
666
667 return counters;
668}
669
670static int copy_entries_to_user(unsigned int total_size,
671 const struct xt_table *table,
672 void __user *userptr)
673{
674 unsigned int off, num;
675 const struct arpt_entry *e;
676 struct xt_counters *counters;
677 struct xt_table_info *private = table->private;
678 int ret = 0;
679 void *loc_cpu_entry;
680
681 counters = alloc_counters(table);
682 if (IS_ERR(counters))
683 return PTR_ERR(counters);
684
685 loc_cpu_entry = private->entries;
686
687
688
689 for (off = 0, num = 0; off < total_size; off += e->next_offset, num++){
690 const struct xt_entry_target *t;
691
692 e = loc_cpu_entry + off;
693 if (copy_to_user(userptr + off, e, sizeof(*e))) {
694 ret = -EFAULT;
695 goto free_counters;
696 }
697 if (copy_to_user(userptr + off
698 + offsetof(struct arpt_entry, counters),
699 &counters[num],
700 sizeof(counters[num])) != 0) {
701 ret = -EFAULT;
702 goto free_counters;
703 }
704
705 t = arpt_get_target_c(e);
706 if (xt_target_to_user(t, userptr + off + e->target_offset)) {
707 ret = -EFAULT;
708 goto free_counters;
709 }
710 }
711
712 free_counters:
713 vfree(counters);
714 return ret;
715}
716
717#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
718static void compat_standard_from_user(void *dst, const void *src)
719{
720 int v = *(compat_int_t *)src;
721
722 if (v > 0)
723 v += xt_compat_calc_jump(NFPROTO_ARP, v);
724 memcpy(dst, &v, sizeof(v));
725}
726
727static int compat_standard_to_user(void __user *dst, const void *src)
728{
729 compat_int_t cv = *(int *)src;
730
731 if (cv > 0)
732 cv -= xt_compat_calc_jump(NFPROTO_ARP, cv);
733 return copy_to_user(dst, &cv, sizeof(cv)) ? -EFAULT : 0;
734}
735
736static int compat_calc_entry(const struct arpt_entry *e,
737 const struct xt_table_info *info,
738 const void *base, struct xt_table_info *newinfo)
739{
740 const struct xt_entry_target *t;
741 unsigned int entry_offset;
742 int off, i, ret;
743
744 off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
745 entry_offset = (void *)e - base;
746
747 t = arpt_get_target_c(e);
748 off += xt_compat_target_offset(t->u.kernel.target);
749 newinfo->size -= off;
750 ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
751 if (ret)
752 return ret;
753
754 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
755 if (info->hook_entry[i] &&
756 (e < (struct arpt_entry *)(base + info->hook_entry[i])))
757 newinfo->hook_entry[i] -= off;
758 if (info->underflow[i] &&
759 (e < (struct arpt_entry *)(base + info->underflow[i])))
760 newinfo->underflow[i] -= off;
761 }
762 return 0;
763}
764
765static int compat_table_info(const struct xt_table_info *info,
766 struct xt_table_info *newinfo)
767{
768 struct arpt_entry *iter;
769 const void *loc_cpu_entry;
770 int ret;
771
772 if (!newinfo || !info)
773 return -EINVAL;
774
775
776 memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
777 newinfo->initial_entries = 0;
778 loc_cpu_entry = info->entries;
779 ret = xt_compat_init_offsets(NFPROTO_ARP, info->number);
780 if (ret)
781 return ret;
782 xt_entry_foreach(iter, loc_cpu_entry, info->size) {
783 ret = compat_calc_entry(iter, info, loc_cpu_entry, newinfo);
784 if (ret != 0)
785 return ret;
786 }
787 return 0;
788}
789#endif
790
791static int get_info(struct net *net, void __user *user, const int *len)
792{
793 char name[XT_TABLE_MAXNAMELEN];
794 struct xt_table *t;
795 int ret;
796
797 if (*len != sizeof(struct arpt_getinfo))
798 return -EINVAL;
799
800 if (copy_from_user(name, user, sizeof(name)) != 0)
801 return -EFAULT;
802
803 name[XT_TABLE_MAXNAMELEN-1] = '\0';
804#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
805 if (in_compat_syscall())
806 xt_compat_lock(NFPROTO_ARP);
807#endif
808 t = xt_request_find_table_lock(net, NFPROTO_ARP, name);
809 if (!IS_ERR(t)) {
810 struct arpt_getinfo info;
811 const struct xt_table_info *private = t->private;
812#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
813 struct xt_table_info tmp;
814
815 if (in_compat_syscall()) {
816 ret = compat_table_info(private, &tmp);
817 xt_compat_flush_offsets(NFPROTO_ARP);
818 private = &tmp;
819 }
820#endif
821 memset(&info, 0, sizeof(info));
822 info.valid_hooks = t->valid_hooks;
823 memcpy(info.hook_entry, private->hook_entry,
824 sizeof(info.hook_entry));
825 memcpy(info.underflow, private->underflow,
826 sizeof(info.underflow));
827 info.num_entries = private->number;
828 info.size = private->size;
829 strcpy(info.name, name);
830
831 if (copy_to_user(user, &info, *len) != 0)
832 ret = -EFAULT;
833 else
834 ret = 0;
835 xt_table_unlock(t);
836 module_put(t->me);
837 } else
838 ret = PTR_ERR(t);
839#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
840 if (in_compat_syscall())
841 xt_compat_unlock(NFPROTO_ARP);
842#endif
843 return ret;
844}
845
846static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
847 const int *len)
848{
849 int ret;
850 struct arpt_get_entries get;
851 struct xt_table *t;
852
853 if (*len < sizeof(get))
854 return -EINVAL;
855 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
856 return -EFAULT;
857 if (*len != sizeof(struct arpt_get_entries) + get.size)
858 return -EINVAL;
859
860 get.name[sizeof(get.name) - 1] = '\0';
861
862 t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
863 if (!IS_ERR(t)) {
864 const struct xt_table_info *private = t->private;
865
866 if (get.size == private->size)
867 ret = copy_entries_to_user(private->size,
868 t, uptr->entrytable);
869 else
870 ret = -EAGAIN;
871
872 module_put(t->me);
873 xt_table_unlock(t);
874 } else
875 ret = PTR_ERR(t);
876
877 return ret;
878}
879
880static int __do_replace(struct net *net, const char *name,
881 unsigned int valid_hooks,
882 struct xt_table_info *newinfo,
883 unsigned int num_counters,
884 void __user *counters_ptr)
885{
886 int ret;
887 struct xt_table *t;
888 struct xt_table_info *oldinfo;
889 struct xt_counters *counters;
890 void *loc_cpu_old_entry;
891 struct arpt_entry *iter;
892
893 ret = 0;
894 counters = xt_counters_alloc(num_counters);
895 if (!counters) {
896 ret = -ENOMEM;
897 goto out;
898 }
899
900 t = xt_request_find_table_lock(net, NFPROTO_ARP, name);
901 if (IS_ERR(t)) {
902 ret = PTR_ERR(t);
903 goto free_newinfo_counters_untrans;
904 }
905
906
907 if (valid_hooks != t->valid_hooks) {
908 ret = -EINVAL;
909 goto put_module;
910 }
911
912 oldinfo = xt_replace_table(t, num_counters, newinfo, &ret);
913 if (!oldinfo)
914 goto put_module;
915
916
917 if ((oldinfo->number > oldinfo->initial_entries) ||
918 (newinfo->number <= oldinfo->initial_entries))
919 module_put(t->me);
920 if ((oldinfo->number > oldinfo->initial_entries) &&
921 (newinfo->number <= oldinfo->initial_entries))
922 module_put(t->me);
923
924 xt_table_unlock(t);
925
926 get_old_counters(oldinfo, counters);
927
928
929 loc_cpu_old_entry = oldinfo->entries;
930 xt_entry_foreach(iter, loc_cpu_old_entry, oldinfo->size)
931 cleanup_entry(iter, net);
932
933 xt_free_table_info(oldinfo);
934 if (copy_to_user(counters_ptr, counters,
935 sizeof(struct xt_counters) * num_counters) != 0) {
936
937 net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n");
938 }
939 vfree(counters);
940 return ret;
941
942 put_module:
943 module_put(t->me);
944 xt_table_unlock(t);
945 free_newinfo_counters_untrans:
946 vfree(counters);
947 out:
948 return ret;
949}
950
951static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
952{
953 int ret;
954 struct arpt_replace tmp;
955 struct xt_table_info *newinfo;
956 void *loc_cpu_entry;
957 struct arpt_entry *iter;
958
959 if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
960 return -EFAULT;
961
962
963 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
964 return -ENOMEM;
965 if (tmp.num_counters == 0)
966 return -EINVAL;
967
968 tmp.name[sizeof(tmp.name)-1] = 0;
969
970 newinfo = xt_alloc_table_info(tmp.size);
971 if (!newinfo)
972 return -ENOMEM;
973
974 loc_cpu_entry = newinfo->entries;
975 if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
976 tmp.size) != 0) {
977 ret = -EFAULT;
978 goto free_newinfo;
979 }
980
981 ret = translate_table(net, newinfo, loc_cpu_entry, &tmp);
982 if (ret != 0)
983 goto free_newinfo;
984
985 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
986 tmp.num_counters, tmp.counters);
987 if (ret)
988 goto free_newinfo_untrans;
989 return 0;
990
991 free_newinfo_untrans:
992 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
993 cleanup_entry(iter, net);
994 free_newinfo:
995 xt_free_table_info(newinfo);
996 return ret;
997}
998
999static int do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
1000{
1001 unsigned int i;
1002 struct xt_counters_info tmp;
1003 struct xt_counters *paddc;
1004 struct xt_table *t;
1005 const struct xt_table_info *private;
1006 int ret = 0;
1007 struct arpt_entry *iter;
1008 unsigned int addend;
1009
1010 paddc = xt_copy_counters(arg, len, &tmp);
1011 if (IS_ERR(paddc))
1012 return PTR_ERR(paddc);
1013
1014 t = xt_find_table_lock(net, NFPROTO_ARP, tmp.name);
1015 if (IS_ERR(t)) {
1016 ret = PTR_ERR(t);
1017 goto free;
1018 }
1019
1020 local_bh_disable();
1021 private = t->private;
1022 if (private->number != tmp.num_counters) {
1023 ret = -EINVAL;
1024 goto unlock_up_free;
1025 }
1026
1027 i = 0;
1028
1029 addend = xt_write_recseq_begin();
1030 xt_entry_foreach(iter, private->entries, private->size) {
1031 struct xt_counters *tmp;
1032
1033 tmp = xt_get_this_cpu_counter(&iter->counters);
1034 ADD_COUNTER(*tmp, paddc[i].bcnt, paddc[i].pcnt);
1035 ++i;
1036 }
1037 xt_write_recseq_end(addend);
1038 unlock_up_free:
1039 local_bh_enable();
1040 xt_table_unlock(t);
1041 module_put(t->me);
1042 free:
1043 vfree(paddc);
1044
1045 return ret;
1046}
1047
1048#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1049struct compat_arpt_replace {
1050 char name[XT_TABLE_MAXNAMELEN];
1051 u32 valid_hooks;
1052 u32 num_entries;
1053 u32 size;
1054 u32 hook_entry[NF_ARP_NUMHOOKS];
1055 u32 underflow[NF_ARP_NUMHOOKS];
1056 u32 num_counters;
1057 compat_uptr_t counters;
1058 struct compat_arpt_entry entries[];
1059};
1060
1061static inline void compat_release_entry(struct compat_arpt_entry *e)
1062{
1063 struct xt_entry_target *t;
1064
1065 t = compat_arpt_get_target(e);
1066 module_put(t->u.kernel.target->me);
1067}
1068
1069static int
1070check_compat_entry_size_and_hooks(struct compat_arpt_entry *e,
1071 struct xt_table_info *newinfo,
1072 unsigned int *size,
1073 const unsigned char *base,
1074 const unsigned char *limit)
1075{
1076 struct xt_entry_target *t;
1077 struct xt_target *target;
1078 unsigned int entry_offset;
1079 int ret, off;
1080
1081 if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 ||
1082 (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit ||
1083 (unsigned char *)e + e->next_offset > limit)
1084 return -EINVAL;
1085
1086 if (e->next_offset < sizeof(struct compat_arpt_entry) +
1087 sizeof(struct compat_xt_entry_target))
1088 return -EINVAL;
1089
1090 if (!arp_checkentry(&e->arp))
1091 return -EINVAL;
1092
1093 ret = xt_compat_check_entry_offsets(e, e->elems, e->target_offset,
1094 e->next_offset);
1095 if (ret)
1096 return ret;
1097
1098 off = sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1099 entry_offset = (void *)e - (void *)base;
1100
1101 t = compat_arpt_get_target(e);
1102 target = xt_request_find_target(NFPROTO_ARP, t->u.user.name,
1103 t->u.user.revision);
1104 if (IS_ERR(target)) {
1105 ret = PTR_ERR(target);
1106 goto out;
1107 }
1108 t->u.kernel.target = target;
1109
1110 off += xt_compat_target_offset(target);
1111 *size += off;
1112 ret = xt_compat_add_offset(NFPROTO_ARP, entry_offset, off);
1113 if (ret)
1114 goto release_target;
1115
1116 return 0;
1117
1118release_target:
1119 module_put(t->u.kernel.target->me);
1120out:
1121 return ret;
1122}
1123
1124static void
1125compat_copy_entry_from_user(struct compat_arpt_entry *e, void **dstptr,
1126 unsigned int *size,
1127 struct xt_table_info *newinfo, unsigned char *base)
1128{
1129 struct xt_entry_target *t;
1130 struct arpt_entry *de;
1131 unsigned int origsize;
1132 int h;
1133
1134 origsize = *size;
1135 de = *dstptr;
1136 memcpy(de, e, sizeof(struct arpt_entry));
1137 memcpy(&de->counters, &e->counters, sizeof(e->counters));
1138
1139 *dstptr += sizeof(struct arpt_entry);
1140 *size += sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1141
1142 de->target_offset = e->target_offset - (origsize - *size);
1143 t = compat_arpt_get_target(e);
1144 xt_compat_target_from_user(t, dstptr, size);
1145
1146 de->next_offset = e->next_offset - (origsize - *size);
1147 for (h = 0; h < NF_ARP_NUMHOOKS; h++) {
1148 if ((unsigned char *)de - base < newinfo->hook_entry[h])
1149 newinfo->hook_entry[h] -= origsize - *size;
1150 if ((unsigned char *)de - base < newinfo->underflow[h])
1151 newinfo->underflow[h] -= origsize - *size;
1152 }
1153}
1154
1155static int translate_compat_table(struct net *net,
1156 struct xt_table_info **pinfo,
1157 void **pentry0,
1158 const struct compat_arpt_replace *compatr)
1159{
1160 unsigned int i, j;
1161 struct xt_table_info *newinfo, *info;
1162 void *pos, *entry0, *entry1;
1163 struct compat_arpt_entry *iter0;
1164 struct arpt_replace repl;
1165 unsigned int size;
1166 int ret;
1167
1168 info = *pinfo;
1169 entry0 = *pentry0;
1170 size = compatr->size;
1171 info->number = compatr->num_entries;
1172
1173 j = 0;
1174 xt_compat_lock(NFPROTO_ARP);
1175 ret = xt_compat_init_offsets(NFPROTO_ARP, compatr->num_entries);
1176 if (ret)
1177 goto out_unlock;
1178
1179 xt_entry_foreach(iter0, entry0, compatr->size) {
1180 ret = check_compat_entry_size_and_hooks(iter0, info, &size,
1181 entry0,
1182 entry0 + compatr->size);
1183 if (ret != 0)
1184 goto out_unlock;
1185 ++j;
1186 }
1187
1188 ret = -EINVAL;
1189 if (j != compatr->num_entries)
1190 goto out_unlock;
1191
1192 ret = -ENOMEM;
1193 newinfo = xt_alloc_table_info(size);
1194 if (!newinfo)
1195 goto out_unlock;
1196
1197 memset(newinfo->entries, 0, size);
1198
1199 newinfo->number = compatr->num_entries;
1200 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
1201 newinfo->hook_entry[i] = compatr->hook_entry[i];
1202 newinfo->underflow[i] = compatr->underflow[i];
1203 }
1204 entry1 = newinfo->entries;
1205 pos = entry1;
1206 size = compatr->size;
1207 xt_entry_foreach(iter0, entry0, compatr->size)
1208 compat_copy_entry_from_user(iter0, &pos, &size,
1209 newinfo, entry1);
1210
1211
1212
1213 xt_compat_flush_offsets(NFPROTO_ARP);
1214 xt_compat_unlock(NFPROTO_ARP);
1215
1216 memcpy(&repl, compatr, sizeof(*compatr));
1217
1218 for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
1219 repl.hook_entry[i] = newinfo->hook_entry[i];
1220 repl.underflow[i] = newinfo->underflow[i];
1221 }
1222
1223 repl.num_counters = 0;
1224 repl.counters = NULL;
1225 repl.size = newinfo->size;
1226 ret = translate_table(net, newinfo, entry1, &repl);
1227 if (ret)
1228 goto free_newinfo;
1229
1230 *pinfo = newinfo;
1231 *pentry0 = entry1;
1232 xt_free_table_info(info);
1233 return 0;
1234
1235free_newinfo:
1236 xt_free_table_info(newinfo);
1237 return ret;
1238out_unlock:
1239 xt_compat_flush_offsets(NFPROTO_ARP);
1240 xt_compat_unlock(NFPROTO_ARP);
1241 xt_entry_foreach(iter0, entry0, compatr->size) {
1242 if (j-- == 0)
1243 break;
1244 compat_release_entry(iter0);
1245 }
1246 return ret;
1247}
1248
1249static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
1250{
1251 int ret;
1252 struct compat_arpt_replace tmp;
1253 struct xt_table_info *newinfo;
1254 void *loc_cpu_entry;
1255 struct arpt_entry *iter;
1256
1257 if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
1258 return -EFAULT;
1259
1260
1261 if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
1262 return -ENOMEM;
1263 if (tmp.num_counters == 0)
1264 return -EINVAL;
1265
1266 tmp.name[sizeof(tmp.name)-1] = 0;
1267
1268 newinfo = xt_alloc_table_info(tmp.size);
1269 if (!newinfo)
1270 return -ENOMEM;
1271
1272 loc_cpu_entry = newinfo->entries;
1273 if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
1274 tmp.size) != 0) {
1275 ret = -EFAULT;
1276 goto free_newinfo;
1277 }
1278
1279 ret = translate_compat_table(net, &newinfo, &loc_cpu_entry, &tmp);
1280 if (ret != 0)
1281 goto free_newinfo;
1282
1283 ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
1284 tmp.num_counters, compat_ptr(tmp.counters));
1285 if (ret)
1286 goto free_newinfo_untrans;
1287 return 0;
1288
1289 free_newinfo_untrans:
1290 xt_entry_foreach(iter, loc_cpu_entry, newinfo->size)
1291 cleanup_entry(iter, net);
1292 free_newinfo:
1293 xt_free_table_info(newinfo);
1294 return ret;
1295}
1296
1297static int compat_copy_entry_to_user(struct arpt_entry *e, void __user **dstptr,
1298 compat_uint_t *size,
1299 struct xt_counters *counters,
1300 unsigned int i)
1301{
1302 struct xt_entry_target *t;
1303 struct compat_arpt_entry __user *ce;
1304 u_int16_t target_offset, next_offset;
1305 compat_uint_t origsize;
1306 int ret;
1307
1308 origsize = *size;
1309 ce = *dstptr;
1310 if (copy_to_user(ce, e, sizeof(struct arpt_entry)) != 0 ||
1311 copy_to_user(&ce->counters, &counters[i],
1312 sizeof(counters[i])) != 0)
1313 return -EFAULT;
1314
1315 *dstptr += sizeof(struct compat_arpt_entry);
1316 *size -= sizeof(struct arpt_entry) - sizeof(struct compat_arpt_entry);
1317
1318 target_offset = e->target_offset - (origsize - *size);
1319
1320 t = arpt_get_target(e);
1321 ret = xt_compat_target_to_user(t, dstptr, size);
1322 if (ret)
1323 return ret;
1324 next_offset = e->next_offset - (origsize - *size);
1325 if (put_user(target_offset, &ce->target_offset) != 0 ||
1326 put_user(next_offset, &ce->next_offset) != 0)
1327 return -EFAULT;
1328 return 0;
1329}
1330
1331static int compat_copy_entries_to_user(unsigned int total_size,
1332 struct xt_table *table,
1333 void __user *userptr)
1334{
1335 struct xt_counters *counters;
1336 const struct xt_table_info *private = table->private;
1337 void __user *pos;
1338 unsigned int size;
1339 int ret = 0;
1340 unsigned int i = 0;
1341 struct arpt_entry *iter;
1342
1343 counters = alloc_counters(table);
1344 if (IS_ERR(counters))
1345 return PTR_ERR(counters);
1346
1347 pos = userptr;
1348 size = total_size;
1349 xt_entry_foreach(iter, private->entries, total_size) {
1350 ret = compat_copy_entry_to_user(iter, &pos,
1351 &size, counters, i++);
1352 if (ret != 0)
1353 break;
1354 }
1355 vfree(counters);
1356 return ret;
1357}
1358
1359struct compat_arpt_get_entries {
1360 char name[XT_TABLE_MAXNAMELEN];
1361 compat_uint_t size;
1362 struct compat_arpt_entry entrytable[];
1363};
1364
1365static int compat_get_entries(struct net *net,
1366 struct compat_arpt_get_entries __user *uptr,
1367 int *len)
1368{
1369 int ret;
1370 struct compat_arpt_get_entries get;
1371 struct xt_table *t;
1372
1373 if (*len < sizeof(get))
1374 return -EINVAL;
1375 if (copy_from_user(&get, uptr, sizeof(get)) != 0)
1376 return -EFAULT;
1377 if (*len != sizeof(struct compat_arpt_get_entries) + get.size)
1378 return -EINVAL;
1379
1380 get.name[sizeof(get.name) - 1] = '\0';
1381
1382 xt_compat_lock(NFPROTO_ARP);
1383 t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
1384 if (!IS_ERR(t)) {
1385 const struct xt_table_info *private = t->private;
1386 struct xt_table_info info;
1387
1388 ret = compat_table_info(private, &info);
1389 if (!ret && get.size == info.size) {
1390 ret = compat_copy_entries_to_user(private->size,
1391 t, uptr->entrytable);
1392 } else if (!ret)
1393 ret = -EAGAIN;
1394
1395 xt_compat_flush_offsets(NFPROTO_ARP);
1396 module_put(t->me);
1397 xt_table_unlock(t);
1398 } else
1399 ret = PTR_ERR(t);
1400
1401 xt_compat_unlock(NFPROTO_ARP);
1402 return ret;
1403}
1404#endif
1405
1406static int do_arpt_set_ctl(struct sock *sk, int cmd, sockptr_t arg,
1407 unsigned int len)
1408{
1409 int ret;
1410
1411 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1412 return -EPERM;
1413
1414 switch (cmd) {
1415 case ARPT_SO_SET_REPLACE:
1416#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1417 if (in_compat_syscall())
1418 ret = compat_do_replace(sock_net(sk), arg, len);
1419 else
1420#endif
1421 ret = do_replace(sock_net(sk), arg, len);
1422 break;
1423
1424 case ARPT_SO_SET_ADD_COUNTERS:
1425 ret = do_add_counters(sock_net(sk), arg, len);
1426 break;
1427
1428 default:
1429 ret = -EINVAL;
1430 }
1431
1432 return ret;
1433}
1434
1435static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
1436{
1437 int ret;
1438
1439 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1440 return -EPERM;
1441
1442 switch (cmd) {
1443 case ARPT_SO_GET_INFO:
1444 ret = get_info(sock_net(sk), user, len);
1445 break;
1446
1447 case ARPT_SO_GET_ENTRIES:
1448#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1449 if (in_compat_syscall())
1450 ret = compat_get_entries(sock_net(sk), user, len);
1451 else
1452#endif
1453 ret = get_entries(sock_net(sk), user, len);
1454 break;
1455
1456 case ARPT_SO_GET_REVISION_TARGET: {
1457 struct xt_get_revision rev;
1458
1459 if (*len != sizeof(rev)) {
1460 ret = -EINVAL;
1461 break;
1462 }
1463 if (copy_from_user(&rev, user, sizeof(rev)) != 0) {
1464 ret = -EFAULT;
1465 break;
1466 }
1467 rev.name[sizeof(rev.name)-1] = 0;
1468
1469 try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name,
1470 rev.revision, 1, &ret),
1471 "arpt_%s", rev.name);
1472 break;
1473 }
1474
1475 default:
1476 ret = -EINVAL;
1477 }
1478
1479 return ret;
1480}
1481
1482static void __arpt_unregister_table(struct net *net, struct xt_table *table)
1483{
1484 struct xt_table_info *private;
1485 void *loc_cpu_entry;
1486 struct module *table_owner = table->me;
1487 struct arpt_entry *iter;
1488
1489 private = xt_unregister_table(table);
1490
1491
1492 loc_cpu_entry = private->entries;
1493 xt_entry_foreach(iter, loc_cpu_entry, private->size)
1494 cleanup_entry(iter, net);
1495 if (private->number > private->initial_entries)
1496 module_put(table_owner);
1497 xt_free_table_info(private);
1498}
1499
1500int arpt_register_table(struct net *net,
1501 const struct xt_table *table,
1502 const struct arpt_replace *repl,
1503 const struct nf_hook_ops *template_ops)
1504{
1505 struct nf_hook_ops *ops;
1506 unsigned int num_ops;
1507 int ret, i;
1508 struct xt_table_info *newinfo;
1509 struct xt_table_info bootstrap = {0};
1510 void *loc_cpu_entry;
1511 struct xt_table *new_table;
1512
1513 newinfo = xt_alloc_table_info(repl->size);
1514 if (!newinfo)
1515 return -ENOMEM;
1516
1517 loc_cpu_entry = newinfo->entries;
1518 memcpy(loc_cpu_entry, repl->entries, repl->size);
1519
1520 ret = translate_table(net, newinfo, loc_cpu_entry, repl);
1521 if (ret != 0) {
1522 xt_free_table_info(newinfo);
1523 return ret;
1524 }
1525
1526 new_table = xt_register_table(net, table, &bootstrap, newinfo);
1527 if (IS_ERR(new_table)) {
1528 xt_free_table_info(newinfo);
1529 return PTR_ERR(new_table);
1530 }
1531
1532 num_ops = hweight32(table->valid_hooks);
1533 if (num_ops == 0) {
1534 ret = -EINVAL;
1535 goto out_free;
1536 }
1537
1538 ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL);
1539 if (!ops) {
1540 ret = -ENOMEM;
1541 goto out_free;
1542 }
1543
1544 for (i = 0; i < num_ops; i++)
1545 ops[i].priv = new_table;
1546
1547 new_table->ops = ops;
1548
1549 ret = nf_register_net_hooks(net, ops, num_ops);
1550 if (ret != 0)
1551 goto out_free;
1552
1553 return ret;
1554
1555out_free:
1556 __arpt_unregister_table(net, new_table);
1557 return ret;
1558}
1559
1560void arpt_unregister_table_pre_exit(struct net *net, const char *name)
1561{
1562 struct xt_table *table = xt_find_table(net, NFPROTO_ARP, name);
1563
1564 if (table)
1565 nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks));
1566}
1567EXPORT_SYMBOL(arpt_unregister_table_pre_exit);
1568
1569void arpt_unregister_table(struct net *net, const char *name)
1570{
1571 struct xt_table *table = xt_find_table(net, NFPROTO_ARP, name);
1572
1573 if (table)
1574 __arpt_unregister_table(net, table);
1575}
1576
1577
1578static struct xt_target arpt_builtin_tg[] __read_mostly = {
1579 {
1580 .name = XT_STANDARD_TARGET,
1581 .targetsize = sizeof(int),
1582 .family = NFPROTO_ARP,
1583#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
1584 .compatsize = sizeof(compat_int_t),
1585 .compat_from_user = compat_standard_from_user,
1586 .compat_to_user = compat_standard_to_user,
1587#endif
1588 },
1589 {
1590 .name = XT_ERROR_TARGET,
1591 .target = arpt_error,
1592 .targetsize = XT_FUNCTION_MAXNAMELEN,
1593 .family = NFPROTO_ARP,
1594 },
1595};
1596
1597static struct nf_sockopt_ops arpt_sockopts = {
1598 .pf = PF_INET,
1599 .set_optmin = ARPT_BASE_CTL,
1600 .set_optmax = ARPT_SO_SET_MAX+1,
1601 .set = do_arpt_set_ctl,
1602 .get_optmin = ARPT_BASE_CTL,
1603 .get_optmax = ARPT_SO_GET_MAX+1,
1604 .get = do_arpt_get_ctl,
1605 .owner = THIS_MODULE,
1606};
1607
1608static int __net_init arp_tables_net_init(struct net *net)
1609{
1610 return xt_proto_init(net, NFPROTO_ARP);
1611}
1612
1613static void __net_exit arp_tables_net_exit(struct net *net)
1614{
1615 xt_proto_fini(net, NFPROTO_ARP);
1616}
1617
1618static struct pernet_operations arp_tables_net_ops = {
1619 .init = arp_tables_net_init,
1620 .exit = arp_tables_net_exit,
1621};
1622
1623static int __init arp_tables_init(void)
1624{
1625 int ret;
1626
1627 ret = register_pernet_subsys(&arp_tables_net_ops);
1628 if (ret < 0)
1629 goto err1;
1630
1631
1632 ret = xt_register_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1633 if (ret < 0)
1634 goto err2;
1635
1636
1637 ret = nf_register_sockopt(&arpt_sockopts);
1638 if (ret < 0)
1639 goto err4;
1640
1641 return 0;
1642
1643err4:
1644 xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1645err2:
1646 unregister_pernet_subsys(&arp_tables_net_ops);
1647err1:
1648 return ret;
1649}
1650
1651static void __exit arp_tables_fini(void)
1652{
1653 nf_unregister_sockopt(&arpt_sockopts);
1654 xt_unregister_targets(arpt_builtin_tg, ARRAY_SIZE(arpt_builtin_tg));
1655 unregister_pernet_subsys(&arp_tables_net_ops);
1656}
1657
1658EXPORT_SYMBOL(arpt_register_table);
1659EXPORT_SYMBOL(arpt_unregister_table);
1660EXPORT_SYMBOL(arpt_do_table);
1661
1662module_init(arp_tables_init);
1663module_exit(arp_tables_fini);
1664
