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)
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
15 #include <linux/capability.h>
16 #include <linux/if_arp.h>
17 #include <linux/kmod.h>
18 #include <linux/vmalloc.h>
19 #include <linux/proc_fs.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/mutex.h>
23 #include <linux/err.h>
24 #include <net/compat.h>
26 #include <asm/uaccess.h>
28 #include <linux/netfilter/x_tables.h>
29 #include <linux/netfilter_arp/arp_tables.h>
30 #include "../../netfilter/xt_repldata.h"
32 MODULE_LICENSE("GPL");
33 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
34 MODULE_DESCRIPTION("arptables core");
36 /*#define DEBUG_ARP_TABLES*/
37 /*#define DEBUG_ARP_TABLES_USER*/
39 #ifdef DEBUG_ARP_TABLES
40 #define dprintf(format, args...) printk(format , ## args)
42 #define dprintf(format, args...)
45 #ifdef DEBUG_ARP_TABLES_USER
46 #define duprintf(format, args...) printk(format , ## args)
48 #define duprintf(format, args...)
51 #ifdef CONFIG_NETFILTER_DEBUG
52 #define ARP_NF_ASSERT(x) WARN_ON(!(x))
54 #define ARP_NF_ASSERT(x)
57 void *arpt_alloc_initial_table(const struct xt_table
*info
)
59 return xt_alloc_initial_table(arpt
, ARPT
);
61 EXPORT_SYMBOL_GPL(arpt_alloc_initial_table
);
63 static inline int arp_devaddr_compare(const struct arpt_devaddr_info
*ap
,
64 const char *hdr_addr
, int len
)
68 if (len
> ARPT_DEV_ADDR_LEN_MAX
)
69 len
= ARPT_DEV_ADDR_LEN_MAX
;
72 for (i
= 0; i
< len
; i
++)
73 ret
|= (hdr_addr
[i
] ^ ap
->addr
[i
]) & ap
->mask
[i
];
79 * Unfortunately, _b and _mask are not aligned to an int (or long int)
80 * Some arches dont care, unrolling the loop is a win on them.
81 * For other arches, we only have a 16bit alignement.
83 static unsigned long ifname_compare(const char *_a
, const char *_b
, const char *_mask
)
85 #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
86 unsigned long ret
= ifname_compare_aligned(_a
, _b
, _mask
);
88 unsigned long ret
= 0;
89 const u16
*a
= (const u16
*)_a
;
90 const u16
*b
= (const u16
*)_b
;
91 const u16
*mask
= (const u16
*)_mask
;
94 for (i
= 0; i
< IFNAMSIZ
/sizeof(u16
); i
++)
95 ret
|= (a
[i
] ^ b
[i
]) & mask
[i
];
100 /* Returns whether packet matches rule or not. */
101 static inline int arp_packet_match(const struct arphdr
*arphdr
,
102 struct net_device
*dev
,
105 const struct arpt_arp
*arpinfo
)
107 const char *arpptr
= (char *)(arphdr
+ 1);
108 const char *src_devaddr
, *tgt_devaddr
;
109 __be32 src_ipaddr
, tgt_ipaddr
;
112 #define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg)))
114 if (FWINV((arphdr
->ar_op
& arpinfo
->arpop_mask
) != arpinfo
->arpop
,
116 dprintf("ARP operation field mismatch.\n");
117 dprintf("ar_op: %04x info->arpop: %04x info->arpop_mask: %04x\n",
118 arphdr
->ar_op
, arpinfo
->arpop
, arpinfo
->arpop_mask
);
122 if (FWINV((arphdr
->ar_hrd
& arpinfo
->arhrd_mask
) != arpinfo
->arhrd
,
124 dprintf("ARP hardware address format mismatch.\n");
125 dprintf("ar_hrd: %04x info->arhrd: %04x info->arhrd_mask: %04x\n",
126 arphdr
->ar_hrd
, arpinfo
->arhrd
, arpinfo
->arhrd_mask
);
130 if (FWINV((arphdr
->ar_pro
& arpinfo
->arpro_mask
) != arpinfo
->arpro
,
132 dprintf("ARP protocol address format mismatch.\n");
133 dprintf("ar_pro: %04x info->arpro: %04x info->arpro_mask: %04x\n",
134 arphdr
->ar_pro
, arpinfo
->arpro
, arpinfo
->arpro_mask
);
138 if (FWINV((arphdr
->ar_hln
& arpinfo
->arhln_mask
) != arpinfo
->arhln
,
140 dprintf("ARP hardware address length mismatch.\n");
141 dprintf("ar_hln: %02x info->arhln: %02x info->arhln_mask: %02x\n",
142 arphdr
->ar_hln
, arpinfo
->arhln
, arpinfo
->arhln_mask
);
146 src_devaddr
= arpptr
;
147 arpptr
+= dev
->addr_len
;
148 memcpy(&src_ipaddr
, arpptr
, sizeof(u32
));
149 arpptr
+= sizeof(u32
);
150 tgt_devaddr
= arpptr
;
151 arpptr
+= dev
->addr_len
;
152 memcpy(&tgt_ipaddr
, arpptr
, sizeof(u32
));
154 if (FWINV(arp_devaddr_compare(&arpinfo
->src_devaddr
, src_devaddr
, dev
->addr_len
),
155 ARPT_INV_SRCDEVADDR
) ||
156 FWINV(arp_devaddr_compare(&arpinfo
->tgt_devaddr
, tgt_devaddr
, dev
->addr_len
),
157 ARPT_INV_TGTDEVADDR
)) {
158 dprintf("Source or target device address mismatch.\n");
163 if (FWINV((src_ipaddr
& arpinfo
->smsk
.s_addr
) != arpinfo
->src
.s_addr
,
165 FWINV(((tgt_ipaddr
& arpinfo
->tmsk
.s_addr
) != arpinfo
->tgt
.s_addr
),
167 dprintf("Source or target IP address mismatch.\n");
169 dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
171 &arpinfo
->smsk
.s_addr
,
172 &arpinfo
->src
.s_addr
,
173 arpinfo
->invflags
& ARPT_INV_SRCIP
? " (INV)" : "");
174 dprintf("TGT: %pI4 Mask: %pI4 Target: %pI4.%s\n",
176 &arpinfo
->tmsk
.s_addr
,
177 &arpinfo
->tgt
.s_addr
,
178 arpinfo
->invflags
& ARPT_INV_TGTIP
? " (INV)" : "");
182 /* Look for ifname matches. */
183 ret
= ifname_compare(indev
, arpinfo
->iniface
, arpinfo
->iniface_mask
);
185 if (FWINV(ret
!= 0, ARPT_INV_VIA_IN
)) {
186 dprintf("VIA in mismatch (%s vs %s).%s\n",
187 indev
, arpinfo
->iniface
,
188 arpinfo
->invflags
&ARPT_INV_VIA_IN
?" (INV)":"");
192 ret
= ifname_compare(outdev
, arpinfo
->outiface
, arpinfo
->outiface_mask
);
194 if (FWINV(ret
!= 0, ARPT_INV_VIA_OUT
)) {
195 dprintf("VIA out mismatch (%s vs %s).%s\n",
196 outdev
, arpinfo
->outiface
,
197 arpinfo
->invflags
&ARPT_INV_VIA_OUT
?" (INV)":"");
205 static inline int arp_checkentry(const struct arpt_arp
*arp
)
207 if (arp
->flags
& ~ARPT_F_MASK
) {
208 duprintf("Unknown flag bits set: %08X\n",
209 arp
->flags
& ~ARPT_F_MASK
);
212 if (arp
->invflags
& ~ARPT_INV_MASK
) {
213 duprintf("Unknown invflag bits set: %08X\n",
214 arp
->invflags
& ~ARPT_INV_MASK
);
222 arpt_error(struct sk_buff
*skb
, const struct xt_action_param
*par
)
224 net_err_ratelimited("arp_tables: error: '%s'\n",
225 (const char *)par
->targinfo
);
230 static inline const struct xt_entry_target
*
231 arpt_get_target_c(const struct arpt_entry
*e
)
233 return arpt_get_target((struct arpt_entry
*)e
);
236 static inline struct arpt_entry
*
237 get_entry(const void *base
, unsigned int offset
)
239 return (struct arpt_entry
*)(base
+ offset
);
243 struct arpt_entry
*arpt_next_entry(const struct arpt_entry
*entry
)
245 return (void *)entry
+ entry
->next_offset
;
248 unsigned int arpt_do_table(struct sk_buff
*skb
,
250 const struct net_device
*in
,
251 const struct net_device
*out
,
252 struct xt_table
*table
)
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
, *back
;
258 const char *indev
, *outdev
;
260 const struct xt_table_info
*private;
261 struct xt_action_param acpar
;
264 if (!pskb_may_pull(skb
, arp_hdr_len(skb
->dev
)))
267 indev
= in
? in
->name
: nulldevname
;
268 outdev
= out
? out
->name
: nulldevname
;
271 addend
= xt_write_recseq_begin();
272 private = table
->private;
273 table_base
= private->entries
[smp_processor_id()];
275 e
= get_entry(table_base
, private->hook_entry
[hook
]);
276 back
= get_entry(table_base
, private->underflow
[hook
]);
280 acpar
.hooknum
= hook
;
281 acpar
.family
= NFPROTO_ARP
;
282 acpar
.hotdrop
= false;
286 const struct xt_entry_target
*t
;
288 if (!arp_packet_match(arp
, skb
->dev
, indev
, outdev
, &e
->arp
)) {
289 e
= arpt_next_entry(e
);
293 ADD_COUNTER(e
->counters
, arp_hdr_len(skb
->dev
), 1);
295 t
= arpt_get_target_c(e
);
297 /* Standard target? */
298 if (!t
->u
.kernel
.target
->target
) {
301 v
= ((struct xt_standard_target
*)t
)->verdict
;
303 /* Pop from stack? */
304 if (v
!= XT_RETURN
) {
305 verdict
= (unsigned int)(-v
) - 1;
309 back
= get_entry(table_base
, back
->comefrom
);
313 != arpt_next_entry(e
)) {
314 /* Save old back ptr in next entry */
315 struct arpt_entry
*next
= arpt_next_entry(e
);
316 next
->comefrom
= (void *)back
- table_base
;
318 /* set back pointer to next entry */
322 e
= get_entry(table_base
, v
);
326 /* Targets which reenter must return
329 acpar
.target
= t
->u
.kernel
.target
;
330 acpar
.targinfo
= t
->data
;
331 verdict
= t
->u
.kernel
.target
->target(skb
, &acpar
);
333 /* Target might have changed stuff. */
336 if (verdict
== XT_CONTINUE
)
337 e
= arpt_next_entry(e
);
341 } while (!acpar
.hotdrop
);
342 xt_write_recseq_end(addend
);
351 /* All zeroes == unconditional rule. */
352 static inline bool unconditional(const struct arpt_arp
*arp
)
354 static const struct arpt_arp uncond
;
356 return memcmp(arp
, &uncond
, sizeof(uncond
)) == 0;
359 /* Figures out from what hook each rule can be called: returns 0 if
360 * there are loops. Puts hook bitmask in comefrom.
362 static int mark_source_chains(const struct xt_table_info
*newinfo
,
363 unsigned int valid_hooks
, void *entry0
)
367 /* No recursion; use packet counter to save back ptrs (reset
368 * to 0 as we leave), and comefrom to save source hook bitmask.
370 for (hook
= 0; hook
< NF_ARP_NUMHOOKS
; hook
++) {
371 unsigned int pos
= newinfo
->hook_entry
[hook
];
373 = (struct arpt_entry
*)(entry0
+ pos
);
375 if (!(valid_hooks
& (1 << hook
)))
378 /* Set initial back pointer. */
379 e
->counters
.pcnt
= pos
;
382 const struct xt_standard_target
*t
383 = (void *)arpt_get_target_c(e
);
384 int visited
= e
->comefrom
& (1 << hook
);
386 if (e
->comefrom
& (1 << NF_ARP_NUMHOOKS
)) {
387 pr_notice("arptables: loop hook %u pos %u %08X.\n",
388 hook
, pos
, e
->comefrom
);
392 |= ((1 << hook
) | (1 << NF_ARP_NUMHOOKS
));
394 /* Unconditional return/END. */
395 if ((e
->target_offset
== sizeof(struct arpt_entry
) &&
396 (strcmp(t
->target
.u
.user
.name
,
397 XT_STANDARD_TARGET
) == 0) &&
398 t
->verdict
< 0 && unconditional(&e
->arp
)) ||
400 unsigned int oldpos
, size
;
402 if ((strcmp(t
->target
.u
.user
.name
,
403 XT_STANDARD_TARGET
) == 0) &&
404 t
->verdict
< -NF_MAX_VERDICT
- 1) {
405 duprintf("mark_source_chains: bad "
406 "negative verdict (%i)\n",
411 /* Return: backtrack through the last
415 e
->comefrom
^= (1<<NF_ARP_NUMHOOKS
);
417 pos
= e
->counters
.pcnt
;
418 e
->counters
.pcnt
= 0;
420 /* We're at the start. */
424 e
= (struct arpt_entry
*)
426 } while (oldpos
== pos
+ e
->next_offset
);
429 size
= e
->next_offset
;
430 e
= (struct arpt_entry
*)
431 (entry0
+ pos
+ size
);
432 e
->counters
.pcnt
= pos
;
435 int newpos
= t
->verdict
;
437 if (strcmp(t
->target
.u
.user
.name
,
438 XT_STANDARD_TARGET
) == 0 &&
440 if (newpos
> newinfo
->size
-
441 sizeof(struct arpt_entry
)) {
442 duprintf("mark_source_chains: "
443 "bad verdict (%i)\n",
448 /* This a jump; chase it. */
449 duprintf("Jump rule %u -> %u\n",
452 /* ... this is a fallthru */
453 newpos
= pos
+ e
->next_offset
;
455 e
= (struct arpt_entry
*)
457 e
->counters
.pcnt
= pos
;
462 duprintf("Finished chain %u\n", hook
);
467 static inline int check_entry(const struct arpt_entry
*e
, const char *name
)
469 const struct xt_entry_target
*t
;
471 if (!arp_checkentry(&e
->arp
)) {
472 duprintf("arp_tables: arp check failed %p %s.\n", e
, name
);
476 if (e
->target_offset
+ sizeof(struct xt_entry_target
) > e
->next_offset
)
479 t
= arpt_get_target_c(e
);
480 if (e
->target_offset
+ t
->u
.target_size
> e
->next_offset
)
486 static inline int check_target(struct arpt_entry
*e
, const char *name
)
488 struct xt_entry_target
*t
= arpt_get_target(e
);
490 struct xt_tgchk_param par
= {
493 .target
= t
->u
.kernel
.target
,
495 .hook_mask
= e
->comefrom
,
496 .family
= NFPROTO_ARP
,
499 ret
= xt_check_target(&par
, t
->u
.target_size
- sizeof(*t
), 0, false);
501 duprintf("arp_tables: check failed for `%s'.\n",
502 t
->u
.kernel
.target
->name
);
509 find_check_entry(struct arpt_entry
*e
, const char *name
, unsigned int size
)
511 struct xt_entry_target
*t
;
512 struct xt_target
*target
;
515 ret
= check_entry(e
, name
);
519 t
= arpt_get_target(e
);
520 target
= xt_request_find_target(NFPROTO_ARP
, t
->u
.user
.name
,
522 if (IS_ERR(target
)) {
523 duprintf("find_check_entry: `%s' not found\n", t
->u
.user
.name
);
524 ret
= PTR_ERR(target
);
527 t
->u
.kernel
.target
= target
;
529 ret
= check_target(e
, name
);
534 module_put(t
->u
.kernel
.target
->me
);
539 static bool check_underflow(const struct arpt_entry
*e
)
541 const struct xt_entry_target
*t
;
542 unsigned int verdict
;
544 if (!unconditional(&e
->arp
))
546 t
= arpt_get_target_c(e
);
547 if (strcmp(t
->u
.user
.name
, XT_STANDARD_TARGET
) != 0)
549 verdict
= ((struct xt_standard_target
*)t
)->verdict
;
550 verdict
= -verdict
- 1;
551 return verdict
== NF_DROP
|| verdict
== NF_ACCEPT
;
554 static inline int check_entry_size_and_hooks(struct arpt_entry
*e
,
555 struct xt_table_info
*newinfo
,
556 const unsigned char *base
,
557 const unsigned char *limit
,
558 const unsigned int *hook_entries
,
559 const unsigned int *underflows
,
560 unsigned int valid_hooks
)
564 if ((unsigned long)e
% __alignof__(struct arpt_entry
) != 0 ||
565 (unsigned char *)e
+ sizeof(struct arpt_entry
) >= limit
) {
566 duprintf("Bad offset %p\n", e
);
571 < sizeof(struct arpt_entry
) + sizeof(struct xt_entry_target
)) {
572 duprintf("checking: element %p size %u\n",
577 /* Check hooks & underflows */
578 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
579 if (!(valid_hooks
& (1 << h
)))
581 if ((unsigned char *)e
- base
== hook_entries
[h
])
582 newinfo
->hook_entry
[h
] = hook_entries
[h
];
583 if ((unsigned char *)e
- base
== underflows
[h
]) {
584 if (!check_underflow(e
)) {
585 pr_err("Underflows must be unconditional and "
586 "use the STANDARD target with "
590 newinfo
->underflow
[h
] = underflows
[h
];
594 /* Clear counters and comefrom */
595 e
->counters
= ((struct xt_counters
) { 0, 0 });
600 static inline void cleanup_entry(struct arpt_entry
*e
)
602 struct xt_tgdtor_param par
;
603 struct xt_entry_target
*t
;
605 t
= arpt_get_target(e
);
606 par
.target
= t
->u
.kernel
.target
;
607 par
.targinfo
= t
->data
;
608 par
.family
= NFPROTO_ARP
;
609 if (par
.target
->destroy
!= NULL
)
610 par
.target
->destroy(&par
);
611 module_put(par
.target
->me
);
614 /* Checks and translates the user-supplied table segment (held in
617 static int translate_table(struct xt_table_info
*newinfo
, void *entry0
,
618 const struct arpt_replace
*repl
)
620 struct arpt_entry
*iter
;
624 newinfo
->size
= repl
->size
;
625 newinfo
->number
= repl
->num_entries
;
627 /* Init all hooks to impossible value. */
628 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
629 newinfo
->hook_entry
[i
] = 0xFFFFFFFF;
630 newinfo
->underflow
[i
] = 0xFFFFFFFF;
633 duprintf("translate_table: size %u\n", newinfo
->size
);
636 /* Walk through entries, checking offsets. */
637 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
638 ret
= check_entry_size_and_hooks(iter
, newinfo
, entry0
,
646 if (strcmp(arpt_get_target(iter
)->u
.user
.name
,
647 XT_ERROR_TARGET
) == 0)
648 ++newinfo
->stacksize
;
650 duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret
);
654 if (i
!= repl
->num_entries
) {
655 duprintf("translate_table: %u not %u entries\n",
656 i
, repl
->num_entries
);
660 /* Check hooks all assigned */
661 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
662 /* Only hooks which are valid */
663 if (!(repl
->valid_hooks
& (1 << i
)))
665 if (newinfo
->hook_entry
[i
] == 0xFFFFFFFF) {
666 duprintf("Invalid hook entry %u %u\n",
667 i
, repl
->hook_entry
[i
]);
670 if (newinfo
->underflow
[i
] == 0xFFFFFFFF) {
671 duprintf("Invalid underflow %u %u\n",
672 i
, repl
->underflow
[i
]);
677 if (!mark_source_chains(newinfo
, repl
->valid_hooks
, entry0
)) {
678 duprintf("Looping hook\n");
682 /* Finally, each sanity check must pass */
684 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
685 ret
= find_check_entry(iter
, repl
->name
, repl
->size
);
692 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
700 /* And one copy for every other CPU */
701 for_each_possible_cpu(i
) {
702 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry0
)
703 memcpy(newinfo
->entries
[i
], entry0
, newinfo
->size
);
709 static void get_counters(const struct xt_table_info
*t
,
710 struct xt_counters counters
[])
712 struct arpt_entry
*iter
;
716 for_each_possible_cpu(cpu
) {
717 seqcount_t
*s
= &per_cpu(xt_recseq
, cpu
);
720 xt_entry_foreach(iter
, t
->entries
[cpu
], t
->size
) {
725 start
= read_seqcount_begin(s
);
726 bcnt
= iter
->counters
.bcnt
;
727 pcnt
= iter
->counters
.pcnt
;
728 } while (read_seqcount_retry(s
, start
));
730 ADD_COUNTER(counters
[i
], bcnt
, pcnt
);
736 static struct xt_counters
*alloc_counters(const struct xt_table
*table
)
738 unsigned int countersize
;
739 struct xt_counters
*counters
;
740 const struct xt_table_info
*private = table
->private;
742 /* We need atomic snapshot of counters: rest doesn't change
743 * (other than comefrom, which userspace doesn't care
746 countersize
= sizeof(struct xt_counters
) * private->number
;
747 counters
= vzalloc(countersize
);
749 if (counters
== NULL
)
750 return ERR_PTR(-ENOMEM
);
752 get_counters(private, counters
);
757 static int copy_entries_to_user(unsigned int total_size
,
758 const struct xt_table
*table
,
759 void __user
*userptr
)
761 unsigned int off
, num
;
762 const struct arpt_entry
*e
;
763 struct xt_counters
*counters
;
764 struct xt_table_info
*private = table
->private;
768 counters
= alloc_counters(table
);
769 if (IS_ERR(counters
))
770 return PTR_ERR(counters
);
772 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
773 /* ... then copy entire thing ... */
774 if (copy_to_user(userptr
, loc_cpu_entry
, total_size
) != 0) {
779 /* FIXME: use iterator macros --RR */
780 /* ... then go back and fix counters and names */
781 for (off
= 0, num
= 0; off
< total_size
; off
+= e
->next_offset
, num
++){
782 const struct xt_entry_target
*t
;
784 e
= (struct arpt_entry
*)(loc_cpu_entry
+ off
);
785 if (copy_to_user(userptr
+ off
786 + offsetof(struct arpt_entry
, counters
),
788 sizeof(counters
[num
])) != 0) {
793 t
= arpt_get_target_c(e
);
794 if (copy_to_user(userptr
+ off
+ e
->target_offset
795 + offsetof(struct xt_entry_target
,
797 t
->u
.kernel
.target
->name
,
798 strlen(t
->u
.kernel
.target
->name
)+1) != 0) {
810 static void compat_standard_from_user(void *dst
, const void *src
)
812 int v
= *(compat_int_t
*)src
;
815 v
+= xt_compat_calc_jump(NFPROTO_ARP
, v
);
816 memcpy(dst
, &v
, sizeof(v
));
819 static int compat_standard_to_user(void __user
*dst
, const void *src
)
821 compat_int_t cv
= *(int *)src
;
824 cv
-= xt_compat_calc_jump(NFPROTO_ARP
, cv
);
825 return copy_to_user(dst
, &cv
, sizeof(cv
)) ? -EFAULT
: 0;
828 static int compat_calc_entry(const struct arpt_entry
*e
,
829 const struct xt_table_info
*info
,
830 const void *base
, struct xt_table_info
*newinfo
)
832 const struct xt_entry_target
*t
;
833 unsigned int entry_offset
;
836 off
= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
837 entry_offset
= (void *)e
- base
;
839 t
= arpt_get_target_c(e
);
840 off
+= xt_compat_target_offset(t
->u
.kernel
.target
);
841 newinfo
->size
-= off
;
842 ret
= xt_compat_add_offset(NFPROTO_ARP
, entry_offset
, off
);
846 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
847 if (info
->hook_entry
[i
] &&
848 (e
< (struct arpt_entry
*)(base
+ info
->hook_entry
[i
])))
849 newinfo
->hook_entry
[i
] -= off
;
850 if (info
->underflow
[i
] &&
851 (e
< (struct arpt_entry
*)(base
+ info
->underflow
[i
])))
852 newinfo
->underflow
[i
] -= off
;
857 static int compat_table_info(const struct xt_table_info
*info
,
858 struct xt_table_info
*newinfo
)
860 struct arpt_entry
*iter
;
864 if (!newinfo
|| !info
)
867 /* we dont care about newinfo->entries[] */
868 memcpy(newinfo
, info
, offsetof(struct xt_table_info
, entries
));
869 newinfo
->initial_entries
= 0;
870 loc_cpu_entry
= info
->entries
[raw_smp_processor_id()];
871 xt_compat_init_offsets(NFPROTO_ARP
, info
->number
);
872 xt_entry_foreach(iter
, loc_cpu_entry
, info
->size
) {
873 ret
= compat_calc_entry(iter
, info
, loc_cpu_entry
, newinfo
);
881 static int get_info(struct net
*net
, void __user
*user
,
882 const int *len
, int compat
)
884 char name
[XT_TABLE_MAXNAMELEN
];
888 if (*len
!= sizeof(struct arpt_getinfo
)) {
889 duprintf("length %u != %Zu\n", *len
,
890 sizeof(struct arpt_getinfo
));
894 if (copy_from_user(name
, user
, sizeof(name
)) != 0)
897 name
[XT_TABLE_MAXNAMELEN
-1] = '\0';
900 xt_compat_lock(NFPROTO_ARP
);
902 t
= try_then_request_module(xt_find_table_lock(net
, NFPROTO_ARP
, name
),
903 "arptable_%s", name
);
904 if (t
&& !IS_ERR(t
)) {
905 struct arpt_getinfo info
;
906 const struct xt_table_info
*private = t
->private;
908 struct xt_table_info tmp
;
911 ret
= compat_table_info(private, &tmp
);
912 xt_compat_flush_offsets(NFPROTO_ARP
);
916 memset(&info
, 0, sizeof(info
));
917 info
.valid_hooks
= t
->valid_hooks
;
918 memcpy(info
.hook_entry
, private->hook_entry
,
919 sizeof(info
.hook_entry
));
920 memcpy(info
.underflow
, private->underflow
,
921 sizeof(info
.underflow
));
922 info
.num_entries
= private->number
;
923 info
.size
= private->size
;
924 strcpy(info
.name
, name
);
926 if (copy_to_user(user
, &info
, *len
) != 0)
933 ret
= t
? PTR_ERR(t
) : -ENOENT
;
936 xt_compat_unlock(NFPROTO_ARP
);
941 static int get_entries(struct net
*net
, struct arpt_get_entries __user
*uptr
,
945 struct arpt_get_entries get
;
948 if (*len
< sizeof(get
)) {
949 duprintf("get_entries: %u < %Zu\n", *len
, sizeof(get
));
952 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
954 if (*len
!= sizeof(struct arpt_get_entries
) + get
.size
) {
955 duprintf("get_entries: %u != %Zu\n", *len
,
956 sizeof(struct arpt_get_entries
) + get
.size
);
960 t
= xt_find_table_lock(net
, NFPROTO_ARP
, get
.name
);
961 if (t
&& !IS_ERR(t
)) {
962 const struct xt_table_info
*private = t
->private;
964 duprintf("t->private->number = %u\n",
966 if (get
.size
== private->size
)
967 ret
= copy_entries_to_user(private->size
,
968 t
, uptr
->entrytable
);
970 duprintf("get_entries: I've got %u not %u!\n",
971 private->size
, get
.size
);
977 ret
= t
? PTR_ERR(t
) : -ENOENT
;
982 static int __do_replace(struct net
*net
, const char *name
,
983 unsigned int valid_hooks
,
984 struct xt_table_info
*newinfo
,
985 unsigned int num_counters
,
986 void __user
*counters_ptr
)
990 struct xt_table_info
*oldinfo
;
991 struct xt_counters
*counters
;
992 void *loc_cpu_old_entry
;
993 struct arpt_entry
*iter
;
996 counters
= vzalloc(num_counters
* sizeof(struct xt_counters
));
1002 t
= try_then_request_module(xt_find_table_lock(net
, NFPROTO_ARP
, name
),
1003 "arptable_%s", name
);
1004 if (!t
|| IS_ERR(t
)) {
1005 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1006 goto free_newinfo_counters_untrans
;
1010 if (valid_hooks
!= t
->valid_hooks
) {
1011 duprintf("Valid hook crap: %08X vs %08X\n",
1012 valid_hooks
, t
->valid_hooks
);
1017 oldinfo
= xt_replace_table(t
, num_counters
, newinfo
, &ret
);
1021 /* Update module usage count based on number of rules */
1022 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1023 oldinfo
->number
, oldinfo
->initial_entries
, newinfo
->number
);
1024 if ((oldinfo
->number
> oldinfo
->initial_entries
) ||
1025 (newinfo
->number
<= oldinfo
->initial_entries
))
1027 if ((oldinfo
->number
> oldinfo
->initial_entries
) &&
1028 (newinfo
->number
<= oldinfo
->initial_entries
))
1031 /* Get the old counters, and synchronize with replace */
1032 get_counters(oldinfo
, counters
);
1034 /* Decrease module usage counts and free resource */
1035 loc_cpu_old_entry
= oldinfo
->entries
[raw_smp_processor_id()];
1036 xt_entry_foreach(iter
, loc_cpu_old_entry
, oldinfo
->size
)
1037 cleanup_entry(iter
);
1039 xt_free_table_info(oldinfo
);
1040 if (copy_to_user(counters_ptr
, counters
,
1041 sizeof(struct xt_counters
) * num_counters
) != 0)
1050 free_newinfo_counters_untrans
:
1056 static int do_replace(struct net
*net
, const void __user
*user
,
1060 struct arpt_replace tmp
;
1061 struct xt_table_info
*newinfo
;
1062 void *loc_cpu_entry
;
1063 struct arpt_entry
*iter
;
1065 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1068 /* overflow check */
1069 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1071 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1073 newinfo
= xt_alloc_table_info(tmp
.size
);
1077 /* choose the copy that is on our node/cpu */
1078 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1079 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1085 ret
= translate_table(newinfo
, loc_cpu_entry
, &tmp
);
1089 duprintf("arp_tables: Translated table\n");
1091 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1092 tmp
.num_counters
, tmp
.counters
);
1094 goto free_newinfo_untrans
;
1097 free_newinfo_untrans
:
1098 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1099 cleanup_entry(iter
);
1101 xt_free_table_info(newinfo
);
1105 static int do_add_counters(struct net
*net
, const void __user
*user
,
1106 unsigned int len
, int compat
)
1108 unsigned int i
, curcpu
;
1109 struct xt_counters_info tmp
;
1110 struct xt_counters
*paddc
;
1111 unsigned int num_counters
;
1116 const struct xt_table_info
*private;
1118 void *loc_cpu_entry
;
1119 struct arpt_entry
*iter
;
1120 unsigned int addend
;
1121 #ifdef CONFIG_COMPAT
1122 struct compat_xt_counters_info compat_tmp
;
1126 size
= sizeof(struct compat_xt_counters_info
);
1131 size
= sizeof(struct xt_counters_info
);
1134 if (copy_from_user(ptmp
, user
, size
) != 0)
1137 #ifdef CONFIG_COMPAT
1139 num_counters
= compat_tmp
.num_counters
;
1140 name
= compat_tmp
.name
;
1144 num_counters
= tmp
.num_counters
;
1148 if (len
!= size
+ num_counters
* sizeof(struct xt_counters
))
1151 paddc
= vmalloc(len
- size
);
1155 if (copy_from_user(paddc
, user
+ size
, len
- size
) != 0) {
1160 t
= xt_find_table_lock(net
, NFPROTO_ARP
, name
);
1161 if (!t
|| IS_ERR(t
)) {
1162 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1167 private = t
->private;
1168 if (private->number
!= num_counters
) {
1170 goto unlock_up_free
;
1174 /* Choose the copy that is on our node */
1175 curcpu
= smp_processor_id();
1176 loc_cpu_entry
= private->entries
[curcpu
];
1177 addend
= xt_write_recseq_begin();
1178 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
) {
1179 ADD_COUNTER(iter
->counters
, paddc
[i
].bcnt
, paddc
[i
].pcnt
);
1182 xt_write_recseq_end(addend
);
1193 #ifdef CONFIG_COMPAT
1194 static inline void compat_release_entry(struct compat_arpt_entry
*e
)
1196 struct xt_entry_target
*t
;
1198 t
= compat_arpt_get_target(e
);
1199 module_put(t
->u
.kernel
.target
->me
);
1203 check_compat_entry_size_and_hooks(struct compat_arpt_entry
*e
,
1204 struct xt_table_info
*newinfo
,
1206 const unsigned char *base
,
1207 const unsigned char *limit
,
1208 const unsigned int *hook_entries
,
1209 const unsigned int *underflows
,
1212 struct xt_entry_target
*t
;
1213 struct xt_target
*target
;
1214 unsigned int entry_offset
;
1217 duprintf("check_compat_entry_size_and_hooks %p\n", e
);
1218 if ((unsigned long)e
% __alignof__(struct compat_arpt_entry
) != 0 ||
1219 (unsigned char *)e
+ sizeof(struct compat_arpt_entry
) >= limit
) {
1220 duprintf("Bad offset %p, limit = %p\n", e
, limit
);
1224 if (e
->next_offset
< sizeof(struct compat_arpt_entry
) +
1225 sizeof(struct compat_xt_entry_target
)) {
1226 duprintf("checking: element %p size %u\n",
1231 /* For purposes of check_entry casting the compat entry is fine */
1232 ret
= check_entry((struct arpt_entry
*)e
, name
);
1236 off
= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1237 entry_offset
= (void *)e
- (void *)base
;
1239 t
= compat_arpt_get_target(e
);
1240 target
= xt_request_find_target(NFPROTO_ARP
, t
->u
.user
.name
,
1241 t
->u
.user
.revision
);
1242 if (IS_ERR(target
)) {
1243 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1245 ret
= PTR_ERR(target
);
1248 t
->u
.kernel
.target
= target
;
1250 off
+= xt_compat_target_offset(target
);
1252 ret
= xt_compat_add_offset(NFPROTO_ARP
, entry_offset
, off
);
1254 goto release_target
;
1256 /* Check hooks & underflows */
1257 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
1258 if ((unsigned char *)e
- base
== hook_entries
[h
])
1259 newinfo
->hook_entry
[h
] = hook_entries
[h
];
1260 if ((unsigned char *)e
- base
== underflows
[h
])
1261 newinfo
->underflow
[h
] = underflows
[h
];
1264 /* Clear counters and comefrom */
1265 memset(&e
->counters
, 0, sizeof(e
->counters
));
1270 module_put(t
->u
.kernel
.target
->me
);
1276 compat_copy_entry_from_user(struct compat_arpt_entry
*e
, void **dstptr
,
1277 unsigned int *size
, const char *name
,
1278 struct xt_table_info
*newinfo
, unsigned char *base
)
1280 struct xt_entry_target
*t
;
1281 struct xt_target
*target
;
1282 struct arpt_entry
*de
;
1283 unsigned int origsize
;
1288 de
= (struct arpt_entry
*)*dstptr
;
1289 memcpy(de
, e
, sizeof(struct arpt_entry
));
1290 memcpy(&de
->counters
, &e
->counters
, sizeof(e
->counters
));
1292 *dstptr
+= sizeof(struct arpt_entry
);
1293 *size
+= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1295 de
->target_offset
= e
->target_offset
- (origsize
- *size
);
1296 t
= compat_arpt_get_target(e
);
1297 target
= t
->u
.kernel
.target
;
1298 xt_compat_target_from_user(t
, dstptr
, size
);
1300 de
->next_offset
= e
->next_offset
- (origsize
- *size
);
1301 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
1302 if ((unsigned char *)de
- base
< newinfo
->hook_entry
[h
])
1303 newinfo
->hook_entry
[h
] -= origsize
- *size
;
1304 if ((unsigned char *)de
- base
< newinfo
->underflow
[h
])
1305 newinfo
->underflow
[h
] -= origsize
- *size
;
1310 static int translate_compat_table(const char *name
,
1311 unsigned int valid_hooks
,
1312 struct xt_table_info
**pinfo
,
1314 unsigned int total_size
,
1315 unsigned int number
,
1316 unsigned int *hook_entries
,
1317 unsigned int *underflows
)
1320 struct xt_table_info
*newinfo
, *info
;
1321 void *pos
, *entry0
, *entry1
;
1322 struct compat_arpt_entry
*iter0
;
1323 struct arpt_entry
*iter1
;
1330 info
->number
= number
;
1332 /* Init all hooks to impossible value. */
1333 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1334 info
->hook_entry
[i
] = 0xFFFFFFFF;
1335 info
->underflow
[i
] = 0xFFFFFFFF;
1338 duprintf("translate_compat_table: size %u\n", info
->size
);
1340 xt_compat_lock(NFPROTO_ARP
);
1341 xt_compat_init_offsets(NFPROTO_ARP
, number
);
1342 /* Walk through entries, checking offsets. */
1343 xt_entry_foreach(iter0
, entry0
, total_size
) {
1344 ret
= check_compat_entry_size_and_hooks(iter0
, info
, &size
,
1346 entry0
+ total_size
,
1357 duprintf("translate_compat_table: %u not %u entries\n",
1362 /* Check hooks all assigned */
1363 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1364 /* Only hooks which are valid */
1365 if (!(valid_hooks
& (1 << i
)))
1367 if (info
->hook_entry
[i
] == 0xFFFFFFFF) {
1368 duprintf("Invalid hook entry %u %u\n",
1369 i
, hook_entries
[i
]);
1372 if (info
->underflow
[i
] == 0xFFFFFFFF) {
1373 duprintf("Invalid underflow %u %u\n",
1380 newinfo
= xt_alloc_table_info(size
);
1384 newinfo
->number
= number
;
1385 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1386 newinfo
->hook_entry
[i
] = info
->hook_entry
[i
];
1387 newinfo
->underflow
[i
] = info
->underflow
[i
];
1389 entry1
= newinfo
->entries
[raw_smp_processor_id()];
1392 xt_entry_foreach(iter0
, entry0
, total_size
) {
1393 ret
= compat_copy_entry_from_user(iter0
, &pos
, &size
,
1394 name
, newinfo
, entry1
);
1398 xt_compat_flush_offsets(NFPROTO_ARP
);
1399 xt_compat_unlock(NFPROTO_ARP
);
1404 if (!mark_source_chains(newinfo
, valid_hooks
, entry1
))
1408 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1409 ret
= check_target(iter1
, name
);
1413 if (strcmp(arpt_get_target(iter1
)->u
.user
.name
,
1414 XT_ERROR_TARGET
) == 0)
1415 ++newinfo
->stacksize
;
1419 * The first i matches need cleanup_entry (calls ->destroy)
1420 * because they had called ->check already. The other j-i
1421 * entries need only release.
1425 xt_entry_foreach(iter0
, entry0
, newinfo
->size
) {
1430 compat_release_entry(iter0
);
1432 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1435 cleanup_entry(iter1
);
1437 xt_free_table_info(newinfo
);
1441 /* And one copy for every other CPU */
1442 for_each_possible_cpu(i
)
1443 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry1
)
1444 memcpy(newinfo
->entries
[i
], entry1
, newinfo
->size
);
1448 xt_free_table_info(info
);
1452 xt_free_table_info(newinfo
);
1454 xt_entry_foreach(iter0
, entry0
, total_size
) {
1457 compat_release_entry(iter0
);
1461 xt_compat_flush_offsets(NFPROTO_ARP
);
1462 xt_compat_unlock(NFPROTO_ARP
);
1466 struct compat_arpt_replace
{
1467 char name
[XT_TABLE_MAXNAMELEN
];
1471 u32 hook_entry
[NF_ARP_NUMHOOKS
];
1472 u32 underflow
[NF_ARP_NUMHOOKS
];
1474 compat_uptr_t counters
;
1475 struct compat_arpt_entry entries
[0];
1478 static int compat_do_replace(struct net
*net
, void __user
*user
,
1482 struct compat_arpt_replace tmp
;
1483 struct xt_table_info
*newinfo
;
1484 void *loc_cpu_entry
;
1485 struct arpt_entry
*iter
;
1487 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1490 /* overflow check */
1491 if (tmp
.size
>= INT_MAX
/ num_possible_cpus())
1493 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1495 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1497 newinfo
= xt_alloc_table_info(tmp
.size
);
1501 /* choose the copy that is on our node/cpu */
1502 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1503 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
), tmp
.size
) != 0) {
1508 ret
= translate_compat_table(tmp
.name
, tmp
.valid_hooks
,
1509 &newinfo
, &loc_cpu_entry
, tmp
.size
,
1510 tmp
.num_entries
, tmp
.hook_entry
,
1515 duprintf("compat_do_replace: Translated table\n");
1517 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1518 tmp
.num_counters
, compat_ptr(tmp
.counters
));
1520 goto free_newinfo_untrans
;
1523 free_newinfo_untrans
:
1524 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1525 cleanup_entry(iter
);
1527 xt_free_table_info(newinfo
);
1531 static int compat_do_arpt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1536 if (!capable(CAP_NET_ADMIN
))
1540 case ARPT_SO_SET_REPLACE
:
1541 ret
= compat_do_replace(sock_net(sk
), user
, len
);
1544 case ARPT_SO_SET_ADD_COUNTERS
:
1545 ret
= do_add_counters(sock_net(sk
), user
, len
, 1);
1549 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd
);
1556 static int compat_copy_entry_to_user(struct arpt_entry
*e
, void __user
**dstptr
,
1557 compat_uint_t
*size
,
1558 struct xt_counters
*counters
,
1561 struct xt_entry_target
*t
;
1562 struct compat_arpt_entry __user
*ce
;
1563 u_int16_t target_offset
, next_offset
;
1564 compat_uint_t origsize
;
1568 ce
= (struct compat_arpt_entry __user
*)*dstptr
;
1569 if (copy_to_user(ce
, e
, sizeof(struct arpt_entry
)) != 0 ||
1570 copy_to_user(&ce
->counters
, &counters
[i
],
1571 sizeof(counters
[i
])) != 0)
1574 *dstptr
+= sizeof(struct compat_arpt_entry
);
1575 *size
-= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1577 target_offset
= e
->target_offset
- (origsize
- *size
);
1579 t
= arpt_get_target(e
);
1580 ret
= xt_compat_target_to_user(t
, dstptr
, size
);
1583 next_offset
= e
->next_offset
- (origsize
- *size
);
1584 if (put_user(target_offset
, &ce
->target_offset
) != 0 ||
1585 put_user(next_offset
, &ce
->next_offset
) != 0)
1590 static int compat_copy_entries_to_user(unsigned int total_size
,
1591 struct xt_table
*table
,
1592 void __user
*userptr
)
1594 struct xt_counters
*counters
;
1595 const struct xt_table_info
*private = table
->private;
1599 void *loc_cpu_entry
;
1601 struct arpt_entry
*iter
;
1603 counters
= alloc_counters(table
);
1604 if (IS_ERR(counters
))
1605 return PTR_ERR(counters
);
1607 /* choose the copy on our node/cpu */
1608 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1611 xt_entry_foreach(iter
, loc_cpu_entry
, total_size
) {
1612 ret
= compat_copy_entry_to_user(iter
, &pos
,
1613 &size
, counters
, i
++);
1621 struct compat_arpt_get_entries
{
1622 char name
[XT_TABLE_MAXNAMELEN
];
1624 struct compat_arpt_entry entrytable
[0];
1627 static int compat_get_entries(struct net
*net
,
1628 struct compat_arpt_get_entries __user
*uptr
,
1632 struct compat_arpt_get_entries get
;
1635 if (*len
< sizeof(get
)) {
1636 duprintf("compat_get_entries: %u < %zu\n", *len
, sizeof(get
));
1639 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1641 if (*len
!= sizeof(struct compat_arpt_get_entries
) + get
.size
) {
1642 duprintf("compat_get_entries: %u != %zu\n",
1643 *len
, sizeof(get
) + get
.size
);
1647 xt_compat_lock(NFPROTO_ARP
);
1648 t
= xt_find_table_lock(net
, NFPROTO_ARP
, get
.name
);
1649 if (t
&& !IS_ERR(t
)) {
1650 const struct xt_table_info
*private = t
->private;
1651 struct xt_table_info info
;
1653 duprintf("t->private->number = %u\n", private->number
);
1654 ret
= compat_table_info(private, &info
);
1655 if (!ret
&& get
.size
== info
.size
) {
1656 ret
= compat_copy_entries_to_user(private->size
,
1657 t
, uptr
->entrytable
);
1659 duprintf("compat_get_entries: I've got %u not %u!\n",
1660 private->size
, get
.size
);
1663 xt_compat_flush_offsets(NFPROTO_ARP
);
1667 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1669 xt_compat_unlock(NFPROTO_ARP
);
1673 static int do_arpt_get_ctl(struct sock
*, int, void __user
*, int *);
1675 static int compat_do_arpt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1680 if (!capable(CAP_NET_ADMIN
))
1684 case ARPT_SO_GET_INFO
:
1685 ret
= get_info(sock_net(sk
), user
, len
, 1);
1687 case ARPT_SO_GET_ENTRIES
:
1688 ret
= compat_get_entries(sock_net(sk
), user
, len
);
1691 ret
= do_arpt_get_ctl(sk
, cmd
, user
, len
);
1697 static int do_arpt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
, unsigned int len
)
1701 if (!capable(CAP_NET_ADMIN
))
1705 case ARPT_SO_SET_REPLACE
:
1706 ret
= do_replace(sock_net(sk
), user
, len
);
1709 case ARPT_SO_SET_ADD_COUNTERS
:
1710 ret
= do_add_counters(sock_net(sk
), user
, len
, 0);
1714 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd
);
1721 static int do_arpt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
1725 if (!capable(CAP_NET_ADMIN
))
1729 case ARPT_SO_GET_INFO
:
1730 ret
= get_info(sock_net(sk
), user
, len
, 0);
1733 case ARPT_SO_GET_ENTRIES
:
1734 ret
= get_entries(sock_net(sk
), user
, len
);
1737 case ARPT_SO_GET_REVISION_TARGET
: {
1738 struct xt_get_revision rev
;
1740 if (*len
!= sizeof(rev
)) {
1744 if (copy_from_user(&rev
, user
, sizeof(rev
)) != 0) {
1748 rev
.name
[sizeof(rev
.name
)-1] = 0;
1750 try_then_request_module(xt_find_revision(NFPROTO_ARP
, rev
.name
,
1751 rev
.revision
, 1, &ret
),
1752 "arpt_%s", rev
.name
);
1757 duprintf("do_arpt_get_ctl: unknown request %i\n", cmd
);
1764 struct xt_table
*arpt_register_table(struct net
*net
,
1765 const struct xt_table
*table
,
1766 const struct arpt_replace
*repl
)
1769 struct xt_table_info
*newinfo
;
1770 struct xt_table_info bootstrap
= {0};
1771 void *loc_cpu_entry
;
1772 struct xt_table
*new_table
;
1774 newinfo
= xt_alloc_table_info(repl
->size
);
1780 /* choose the copy on our node/cpu */
1781 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1782 memcpy(loc_cpu_entry
, repl
->entries
, repl
->size
);
1784 ret
= translate_table(newinfo
, loc_cpu_entry
, repl
);
1785 duprintf("arpt_register_table: translate table gives %d\n", ret
);
1789 new_table
= xt_register_table(net
, table
, &bootstrap
, newinfo
);
1790 if (IS_ERR(new_table
)) {
1791 ret
= PTR_ERR(new_table
);
1797 xt_free_table_info(newinfo
);
1799 return ERR_PTR(ret
);
1802 void arpt_unregister_table(struct xt_table
*table
)
1804 struct xt_table_info
*private;
1805 void *loc_cpu_entry
;
1806 struct module
*table_owner
= table
->me
;
1807 struct arpt_entry
*iter
;
1809 private = xt_unregister_table(table
);
1811 /* Decrease module usage counts and free resources */
1812 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1813 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
)
1814 cleanup_entry(iter
);
1815 if (private->number
> private->initial_entries
)
1816 module_put(table_owner
);
1817 xt_free_table_info(private);
1820 /* The built-in targets: standard (NULL) and error. */
1821 static struct xt_target arpt_builtin_tg
[] __read_mostly
= {
1823 .name
= XT_STANDARD_TARGET
,
1824 .targetsize
= sizeof(int),
1825 .family
= NFPROTO_ARP
,
1826 #ifdef CONFIG_COMPAT
1827 .compatsize
= sizeof(compat_int_t
),
1828 .compat_from_user
= compat_standard_from_user
,
1829 .compat_to_user
= compat_standard_to_user
,
1833 .name
= XT_ERROR_TARGET
,
1834 .target
= arpt_error
,
1835 .targetsize
= XT_FUNCTION_MAXNAMELEN
,
1836 .family
= NFPROTO_ARP
,
1840 static struct nf_sockopt_ops arpt_sockopts
= {
1842 .set_optmin
= ARPT_BASE_CTL
,
1843 .set_optmax
= ARPT_SO_SET_MAX
+1,
1844 .set
= do_arpt_set_ctl
,
1845 #ifdef CONFIG_COMPAT
1846 .compat_set
= compat_do_arpt_set_ctl
,
1848 .get_optmin
= ARPT_BASE_CTL
,
1849 .get_optmax
= ARPT_SO_GET_MAX
+1,
1850 .get
= do_arpt_get_ctl
,
1851 #ifdef CONFIG_COMPAT
1852 .compat_get
= compat_do_arpt_get_ctl
,
1854 .owner
= THIS_MODULE
,
1857 static int __net_init
arp_tables_net_init(struct net
*net
)
1859 return xt_proto_init(net
, NFPROTO_ARP
);
1862 static void __net_exit
arp_tables_net_exit(struct net
*net
)
1864 xt_proto_fini(net
, NFPROTO_ARP
);
1867 static struct pernet_operations arp_tables_net_ops
= {
1868 .init
= arp_tables_net_init
,
1869 .exit
= arp_tables_net_exit
,
1872 static int __init
arp_tables_init(void)
1876 ret
= register_pernet_subsys(&arp_tables_net_ops
);
1880 /* No one else will be downing sem now, so we won't sleep */
1881 ret
= xt_register_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1885 /* Register setsockopt */
1886 ret
= nf_register_sockopt(&arpt_sockopts
);
1890 printk(KERN_INFO
"arp_tables: (C) 2002 David S. Miller\n");
1894 xt_unregister_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1896 unregister_pernet_subsys(&arp_tables_net_ops
);
1901 static void __exit
arp_tables_fini(void)
1903 nf_unregister_sockopt(&arpt_sockopts
);
1904 xt_unregister_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1905 unregister_pernet_subsys(&arp_tables_net_ops
);
1908 EXPORT_SYMBOL(arpt_register_table
);
1909 EXPORT_SYMBOL(arpt_unregister_table
);
1910 EXPORT_SYMBOL(arpt_do_table
);
1912 module_init(arp_tables_init
);
1913 module_exit(arp_tables_fini
);