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
,
251 const struct net_device
*in
,
252 const struct net_device
*out
,
253 struct xt_table
*table
)
255 static const char nulldevname
[IFNAMSIZ
] __attribute__((aligned(sizeof(long))));
256 unsigned int verdict
= NF_DROP
;
257 const struct arphdr
*arp
;
258 struct arpt_entry
*e
, *back
;
259 const char *indev
, *outdev
;
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
= in
? in
->name
: nulldevname
;
269 outdev
= out
? out
->name
: nulldevname
;
272 addend
= xt_write_recseq_begin();
273 private = table
->private;
274 table_base
= private->entries
[smp_processor_id()];
276 e
= get_entry(table_base
, private->hook_entry
[hook
]);
277 back
= get_entry(table_base
, private->underflow
[hook
]);
281 acpar
.hooknum
= hook
;
282 acpar
.family
= NFPROTO_ARP
;
283 acpar
.hotdrop
= false;
287 const struct xt_entry_target
*t
;
289 if (!arp_packet_match(arp
, skb
->dev
, indev
, outdev
, &e
->arp
)) {
290 e
= arpt_next_entry(e
);
294 ADD_COUNTER(e
->counters
, arp_hdr_len(skb
->dev
), 1);
296 t
= arpt_get_target_c(e
);
298 /* Standard target? */
299 if (!t
->u
.kernel
.target
->target
) {
302 v
= ((struct xt_standard_target
*)t
)->verdict
;
304 /* Pop from stack? */
305 if (v
!= XT_RETURN
) {
306 verdict
= (unsigned int)(-v
) - 1;
310 back
= get_entry(table_base
, back
->comefrom
);
314 != arpt_next_entry(e
)) {
315 /* Save old back ptr in next entry */
316 struct arpt_entry
*next
= arpt_next_entry(e
);
317 next
->comefrom
= (void *)back
- table_base
;
319 /* set back pointer to next entry */
323 e
= get_entry(table_base
, v
);
327 /* Targets which reenter must return
330 acpar
.target
= t
->u
.kernel
.target
;
331 acpar
.targinfo
= t
->data
;
332 verdict
= t
->u
.kernel
.target
->target(skb
, &acpar
);
334 /* Target might have changed stuff. */
337 if (verdict
== XT_CONTINUE
)
338 e
= arpt_next_entry(e
);
342 } while (!acpar
.hotdrop
);
343 xt_write_recseq_end(addend
);
352 /* All zeroes == unconditional rule. */
353 static inline bool unconditional(const struct arpt_entry
*e
)
355 static const struct arpt_arp uncond
;
357 return e
->target_offset
== sizeof(struct arpt_entry
) &&
358 memcmp(&e
->arp
, &uncond
, sizeof(uncond
)) == 0;
361 /* Figures out from what hook each rule can be called: returns 0 if
362 * there are loops. Puts hook bitmask in comefrom.
364 static int mark_source_chains(const struct xt_table_info
*newinfo
,
365 unsigned int valid_hooks
, void *entry0
)
369 /* No recursion; use packet counter to save back ptrs (reset
370 * to 0 as we leave), and comefrom to save source hook bitmask.
372 for (hook
= 0; hook
< NF_ARP_NUMHOOKS
; hook
++) {
373 unsigned int pos
= newinfo
->hook_entry
[hook
];
375 = (struct arpt_entry
*)(entry0
+ pos
);
377 if (!(valid_hooks
& (1 << hook
)))
380 /* Set initial back pointer. */
381 e
->counters
.pcnt
= pos
;
384 const struct xt_standard_target
*t
385 = (void *)arpt_get_target_c(e
);
386 int visited
= e
->comefrom
& (1 << hook
);
388 if (e
->comefrom
& (1 << NF_ARP_NUMHOOKS
)) {
389 pr_notice("arptables: loop hook %u pos %u %08X.\n",
390 hook
, pos
, e
->comefrom
);
394 |= ((1 << hook
) | (1 << NF_ARP_NUMHOOKS
));
396 /* Unconditional return/END. */
397 if ((unconditional(e
) &&
398 (strcmp(t
->target
.u
.user
.name
,
399 XT_STANDARD_TARGET
) == 0) &&
400 t
->verdict
< 0) || visited
) {
401 unsigned int oldpos
, size
;
403 if ((strcmp(t
->target
.u
.user
.name
,
404 XT_STANDARD_TARGET
) == 0) &&
405 t
->verdict
< -NF_MAX_VERDICT
- 1) {
406 duprintf("mark_source_chains: bad "
407 "negative verdict (%i)\n",
412 /* Return: backtrack through the last
416 e
->comefrom
^= (1<<NF_ARP_NUMHOOKS
);
418 pos
= e
->counters
.pcnt
;
419 e
->counters
.pcnt
= 0;
421 /* We're at the start. */
425 e
= (struct arpt_entry
*)
427 } while (oldpos
== pos
+ e
->next_offset
);
430 size
= e
->next_offset
;
431 e
= (struct arpt_entry
*)
432 (entry0
+ pos
+ size
);
433 e
->counters
.pcnt
= pos
;
436 int newpos
= t
->verdict
;
438 if (strcmp(t
->target
.u
.user
.name
,
439 XT_STANDARD_TARGET
) == 0 &&
441 if (newpos
> newinfo
->size
-
442 sizeof(struct arpt_entry
)) {
443 duprintf("mark_source_chains: "
444 "bad verdict (%i)\n",
449 /* This a jump; chase it. */
450 duprintf("Jump rule %u -> %u\n",
453 /* ... this is a fallthru */
454 newpos
= pos
+ e
->next_offset
;
456 e
= (struct arpt_entry
*)
458 e
->counters
.pcnt
= pos
;
463 duprintf("Finished chain %u\n", hook
);
468 static inline int check_entry(const struct arpt_entry
*e
)
470 const struct xt_entry_target
*t
;
472 if (!arp_checkentry(&e
->arp
))
475 if (e
->target_offset
+ sizeof(struct xt_entry_target
) > e
->next_offset
)
478 t
= arpt_get_target_c(e
);
479 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 t
= arpt_get_target(e
);
516 target
= xt_request_find_target(NFPROTO_ARP
, t
->u
.user
.name
,
518 if (IS_ERR(target
)) {
519 duprintf("find_check_entry: `%s' not found\n", t
->u
.user
.name
);
520 ret
= PTR_ERR(target
);
523 t
->u
.kernel
.target
= target
;
525 ret
= check_target(e
, name
);
530 module_put(t
->u
.kernel
.target
->me
);
535 static bool check_underflow(const struct arpt_entry
*e
)
537 const struct xt_entry_target
*t
;
538 unsigned int verdict
;
540 if (!unconditional(e
))
542 t
= arpt_get_target_c(e
);
543 if (strcmp(t
->u
.user
.name
, XT_STANDARD_TARGET
) != 0)
545 verdict
= ((struct xt_standard_target
*)t
)->verdict
;
546 verdict
= -verdict
- 1;
547 return verdict
== NF_DROP
|| verdict
== NF_ACCEPT
;
550 static inline int check_entry_size_and_hooks(struct arpt_entry
*e
,
551 struct xt_table_info
*newinfo
,
552 const unsigned char *base
,
553 const unsigned char *limit
,
554 const unsigned int *hook_entries
,
555 const unsigned int *underflows
,
556 unsigned int valid_hooks
)
561 if ((unsigned long)e
% __alignof__(struct arpt_entry
) != 0 ||
562 (unsigned char *)e
+ sizeof(struct arpt_entry
) >= limit
||
563 (unsigned char *)e
+ e
->next_offset
> limit
) {
564 duprintf("Bad offset %p\n", e
);
569 < sizeof(struct arpt_entry
) + sizeof(struct xt_entry_target
)) {
570 duprintf("checking: element %p size %u\n",
575 err
= check_entry(e
);
579 /* Check hooks & underflows */
580 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
581 if (!(valid_hooks
& (1 << h
)))
583 if ((unsigned char *)e
- base
== hook_entries
[h
])
584 newinfo
->hook_entry
[h
] = hook_entries
[h
];
585 if ((unsigned char *)e
- base
== underflows
[h
]) {
586 if (!check_underflow(e
)) {
587 pr_err("Underflows must be unconditional and "
588 "use the STANDARD target with "
592 newinfo
->underflow
[h
] = underflows
[h
];
596 /* Clear counters and comefrom */
597 e
->counters
= ((struct xt_counters
) { 0, 0 });
602 static inline void cleanup_entry(struct arpt_entry
*e
)
604 struct xt_tgdtor_param par
;
605 struct xt_entry_target
*t
;
607 t
= arpt_get_target(e
);
608 par
.target
= t
->u
.kernel
.target
;
609 par
.targinfo
= t
->data
;
610 par
.family
= NFPROTO_ARP
;
611 if (par
.target
->destroy
!= NULL
)
612 par
.target
->destroy(&par
);
613 module_put(par
.target
->me
);
616 /* Checks and translates the user-supplied table segment (held in
619 static int translate_table(struct xt_table_info
*newinfo
, void *entry0
,
620 const struct arpt_replace
*repl
)
622 struct arpt_entry
*iter
;
626 newinfo
->size
= repl
->size
;
627 newinfo
->number
= repl
->num_entries
;
629 /* Init all hooks to impossible value. */
630 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
631 newinfo
->hook_entry
[i
] = 0xFFFFFFFF;
632 newinfo
->underflow
[i
] = 0xFFFFFFFF;
635 duprintf("translate_table: size %u\n", newinfo
->size
);
638 /* Walk through entries, checking offsets. */
639 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
640 ret
= check_entry_size_and_hooks(iter
, newinfo
, entry0
,
648 if (strcmp(arpt_get_target(iter
)->u
.user
.name
,
649 XT_ERROR_TARGET
) == 0)
650 ++newinfo
->stacksize
;
652 duprintf("translate_table: ARPT_ENTRY_ITERATE gives %d\n", ret
);
656 if (i
!= repl
->num_entries
) {
657 duprintf("translate_table: %u not %u entries\n",
658 i
, repl
->num_entries
);
662 /* Check hooks all assigned */
663 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
664 /* Only hooks which are valid */
665 if (!(repl
->valid_hooks
& (1 << i
)))
667 if (newinfo
->hook_entry
[i
] == 0xFFFFFFFF) {
668 duprintf("Invalid hook entry %u %u\n",
669 i
, repl
->hook_entry
[i
]);
672 if (newinfo
->underflow
[i
] == 0xFFFFFFFF) {
673 duprintf("Invalid underflow %u %u\n",
674 i
, repl
->underflow
[i
]);
679 if (!mark_source_chains(newinfo
, repl
->valid_hooks
, entry0
)) {
680 duprintf("Looping hook\n");
684 /* Finally, each sanity check must pass */
686 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
687 ret
= find_check_entry(iter
, repl
->name
, repl
->size
);
694 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
702 /* And one copy for every other CPU */
703 for_each_possible_cpu(i
) {
704 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry0
)
705 memcpy(newinfo
->entries
[i
], entry0
, newinfo
->size
);
711 static void get_counters(const struct xt_table_info
*t
,
712 struct xt_counters counters
[])
714 struct arpt_entry
*iter
;
718 for_each_possible_cpu(cpu
) {
719 seqcount_t
*s
= &per_cpu(xt_recseq
, cpu
);
722 xt_entry_foreach(iter
, t
->entries
[cpu
], t
->size
) {
727 start
= read_seqcount_begin(s
);
728 bcnt
= iter
->counters
.bcnt
;
729 pcnt
= iter
->counters
.pcnt
;
730 } while (read_seqcount_retry(s
, start
));
732 ADD_COUNTER(counters
[i
], bcnt
, pcnt
);
738 static struct xt_counters
*alloc_counters(const struct xt_table
*table
)
740 unsigned int countersize
;
741 struct xt_counters
*counters
;
742 const struct xt_table_info
*private = table
->private;
744 /* We need atomic snapshot of counters: rest doesn't change
745 * (other than comefrom, which userspace doesn't care
748 countersize
= sizeof(struct xt_counters
) * private->number
;
749 counters
= vzalloc(countersize
);
751 if (counters
== NULL
)
752 return ERR_PTR(-ENOMEM
);
754 get_counters(private, counters
);
759 static int copy_entries_to_user(unsigned int total_size
,
760 const struct xt_table
*table
,
761 void __user
*userptr
)
763 unsigned int off
, num
;
764 const struct arpt_entry
*e
;
765 struct xt_counters
*counters
;
766 struct xt_table_info
*private = table
->private;
770 counters
= alloc_counters(table
);
771 if (IS_ERR(counters
))
772 return PTR_ERR(counters
);
774 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
775 /* ... then copy entire thing ... */
776 if (copy_to_user(userptr
, loc_cpu_entry
, total_size
) != 0) {
781 /* FIXME: use iterator macros --RR */
782 /* ... then go back and fix counters and names */
783 for (off
= 0, num
= 0; off
< total_size
; off
+= e
->next_offset
, num
++){
784 const struct xt_entry_target
*t
;
786 e
= (struct arpt_entry
*)(loc_cpu_entry
+ off
);
787 if (copy_to_user(userptr
+ off
788 + offsetof(struct arpt_entry
, counters
),
790 sizeof(counters
[num
])) != 0) {
795 t
= arpt_get_target_c(e
);
796 if (copy_to_user(userptr
+ off
+ e
->target_offset
797 + offsetof(struct xt_entry_target
,
799 t
->u
.kernel
.target
->name
,
800 strlen(t
->u
.kernel
.target
->name
)+1) != 0) {
812 static void compat_standard_from_user(void *dst
, const void *src
)
814 int v
= *(compat_int_t
*)src
;
817 v
+= xt_compat_calc_jump(NFPROTO_ARP
, v
);
818 memcpy(dst
, &v
, sizeof(v
));
821 static int compat_standard_to_user(void __user
*dst
, const void *src
)
823 compat_int_t cv
= *(int *)src
;
826 cv
-= xt_compat_calc_jump(NFPROTO_ARP
, cv
);
827 return copy_to_user(dst
, &cv
, sizeof(cv
)) ? -EFAULT
: 0;
830 static int compat_calc_entry(const struct arpt_entry
*e
,
831 const struct xt_table_info
*info
,
832 const void *base
, struct xt_table_info
*newinfo
)
834 const struct xt_entry_target
*t
;
835 unsigned int entry_offset
;
838 off
= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
839 entry_offset
= (void *)e
- base
;
841 t
= arpt_get_target_c(e
);
842 off
+= xt_compat_target_offset(t
->u
.kernel
.target
);
843 newinfo
->size
-= off
;
844 ret
= xt_compat_add_offset(NFPROTO_ARP
, entry_offset
, off
);
848 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
849 if (info
->hook_entry
[i
] &&
850 (e
< (struct arpt_entry
*)(base
+ info
->hook_entry
[i
])))
851 newinfo
->hook_entry
[i
] -= off
;
852 if (info
->underflow
[i
] &&
853 (e
< (struct arpt_entry
*)(base
+ info
->underflow
[i
])))
854 newinfo
->underflow
[i
] -= off
;
859 static int compat_table_info(const struct xt_table_info
*info
,
860 struct xt_table_info
*newinfo
)
862 struct arpt_entry
*iter
;
866 if (!newinfo
|| !info
)
869 /* we dont care about newinfo->entries[] */
870 memcpy(newinfo
, info
, offsetof(struct xt_table_info
, entries
));
871 newinfo
->initial_entries
= 0;
872 loc_cpu_entry
= info
->entries
[raw_smp_processor_id()];
873 xt_compat_init_offsets(NFPROTO_ARP
, info
->number
);
874 xt_entry_foreach(iter
, loc_cpu_entry
, info
->size
) {
875 ret
= compat_calc_entry(iter
, info
, loc_cpu_entry
, newinfo
);
883 static int get_info(struct net
*net
, void __user
*user
,
884 const int *len
, int compat
)
886 char name
[XT_TABLE_MAXNAMELEN
];
890 if (*len
!= sizeof(struct arpt_getinfo
)) {
891 duprintf("length %u != %Zu\n", *len
,
892 sizeof(struct arpt_getinfo
));
896 if (copy_from_user(name
, user
, sizeof(name
)) != 0)
899 name
[XT_TABLE_MAXNAMELEN
-1] = '\0';
902 xt_compat_lock(NFPROTO_ARP
);
904 t
= try_then_request_module(xt_find_table_lock(net
, NFPROTO_ARP
, name
),
905 "arptable_%s", name
);
906 if (!IS_ERR_OR_NULL(t
)) {
907 struct arpt_getinfo info
;
908 const struct xt_table_info
*private = t
->private;
910 struct xt_table_info tmp
;
913 ret
= compat_table_info(private, &tmp
);
914 xt_compat_flush_offsets(NFPROTO_ARP
);
918 memset(&info
, 0, sizeof(info
));
919 info
.valid_hooks
= t
->valid_hooks
;
920 memcpy(info
.hook_entry
, private->hook_entry
,
921 sizeof(info
.hook_entry
));
922 memcpy(info
.underflow
, private->underflow
,
923 sizeof(info
.underflow
));
924 info
.num_entries
= private->number
;
925 info
.size
= private->size
;
926 strcpy(info
.name
, name
);
928 if (copy_to_user(user
, &info
, *len
) != 0)
935 ret
= t
? PTR_ERR(t
) : -ENOENT
;
938 xt_compat_unlock(NFPROTO_ARP
);
943 static int get_entries(struct net
*net
, struct arpt_get_entries __user
*uptr
,
947 struct arpt_get_entries get
;
950 if (*len
< sizeof(get
)) {
951 duprintf("get_entries: %u < %Zu\n", *len
, sizeof(get
));
954 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
956 if (*len
!= sizeof(struct arpt_get_entries
) + get
.size
) {
957 duprintf("get_entries: %u != %Zu\n", *len
,
958 sizeof(struct arpt_get_entries
) + get
.size
);
962 t
= xt_find_table_lock(net
, NFPROTO_ARP
, get
.name
);
963 if (!IS_ERR_OR_NULL(t
)) {
964 const struct xt_table_info
*private = t
->private;
966 duprintf("t->private->number = %u\n",
968 if (get
.size
== private->size
)
969 ret
= copy_entries_to_user(private->size
,
970 t
, uptr
->entrytable
);
972 duprintf("get_entries: I've got %u not %u!\n",
973 private->size
, get
.size
);
979 ret
= t
? PTR_ERR(t
) : -ENOENT
;
984 static int __do_replace(struct net
*net
, const char *name
,
985 unsigned int valid_hooks
,
986 struct xt_table_info
*newinfo
,
987 unsigned int num_counters
,
988 void __user
*counters_ptr
)
992 struct xt_table_info
*oldinfo
;
993 struct xt_counters
*counters
;
994 void *loc_cpu_old_entry
;
995 struct arpt_entry
*iter
;
998 counters
= vzalloc(num_counters
* sizeof(struct xt_counters
));
1004 t
= try_then_request_module(xt_find_table_lock(net
, NFPROTO_ARP
, name
),
1005 "arptable_%s", name
);
1006 if (IS_ERR_OR_NULL(t
)) {
1007 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1008 goto free_newinfo_counters_untrans
;
1012 if (valid_hooks
!= t
->valid_hooks
) {
1013 duprintf("Valid hook crap: %08X vs %08X\n",
1014 valid_hooks
, t
->valid_hooks
);
1019 oldinfo
= xt_replace_table(t
, num_counters
, newinfo
, &ret
);
1023 /* Update module usage count based on number of rules */
1024 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1025 oldinfo
->number
, oldinfo
->initial_entries
, newinfo
->number
);
1026 if ((oldinfo
->number
> oldinfo
->initial_entries
) ||
1027 (newinfo
->number
<= oldinfo
->initial_entries
))
1029 if ((oldinfo
->number
> oldinfo
->initial_entries
) &&
1030 (newinfo
->number
<= oldinfo
->initial_entries
))
1033 /* Get the old counters, and synchronize with replace */
1034 get_counters(oldinfo
, counters
);
1036 /* Decrease module usage counts and free resource */
1037 loc_cpu_old_entry
= oldinfo
->entries
[raw_smp_processor_id()];
1038 xt_entry_foreach(iter
, loc_cpu_old_entry
, oldinfo
->size
)
1039 cleanup_entry(iter
);
1041 xt_free_table_info(oldinfo
);
1042 if (copy_to_user(counters_ptr
, counters
,
1043 sizeof(struct xt_counters
) * num_counters
) != 0) {
1044 /* Silent error, can't fail, new table is already in place */
1045 net_warn_ratelimited("arptables: counters copy to user failed while replacing table\n");
1054 free_newinfo_counters_untrans
:
1060 static int do_replace(struct net
*net
, const void __user
*user
,
1064 struct arpt_replace tmp
;
1065 struct xt_table_info
*newinfo
;
1066 void *loc_cpu_entry
;
1067 struct arpt_entry
*iter
;
1069 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1072 /* overflow check */
1073 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1075 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1077 newinfo
= xt_alloc_table_info(tmp
.size
);
1081 /* choose the copy that is on our node/cpu */
1082 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1083 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1089 ret
= translate_table(newinfo
, loc_cpu_entry
, &tmp
);
1093 duprintf("arp_tables: Translated table\n");
1095 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1096 tmp
.num_counters
, tmp
.counters
);
1098 goto free_newinfo_untrans
;
1101 free_newinfo_untrans
:
1102 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1103 cleanup_entry(iter
);
1105 xt_free_table_info(newinfo
);
1109 static int do_add_counters(struct net
*net
, const void __user
*user
,
1110 unsigned int len
, int compat
)
1112 unsigned int i
, curcpu
;
1113 struct xt_counters_info tmp
;
1114 struct xt_counters
*paddc
;
1115 unsigned int num_counters
;
1120 const struct xt_table_info
*private;
1122 void *loc_cpu_entry
;
1123 struct arpt_entry
*iter
;
1124 unsigned int addend
;
1125 #ifdef CONFIG_COMPAT
1126 struct compat_xt_counters_info compat_tmp
;
1130 size
= sizeof(struct compat_xt_counters_info
);
1135 size
= sizeof(struct xt_counters_info
);
1138 if (copy_from_user(ptmp
, user
, size
) != 0)
1141 #ifdef CONFIG_COMPAT
1143 num_counters
= compat_tmp
.num_counters
;
1144 name
= compat_tmp
.name
;
1148 num_counters
= tmp
.num_counters
;
1152 if (len
!= size
+ num_counters
* sizeof(struct xt_counters
))
1155 paddc
= vmalloc(len
- size
);
1159 if (copy_from_user(paddc
, user
+ size
, len
- size
) != 0) {
1164 t
= xt_find_table_lock(net
, NFPROTO_ARP
, name
);
1165 if (IS_ERR_OR_NULL(t
)) {
1166 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1171 private = t
->private;
1172 if (private->number
!= num_counters
) {
1174 goto unlock_up_free
;
1178 /* Choose the copy that is on our node */
1179 curcpu
= smp_processor_id();
1180 loc_cpu_entry
= private->entries
[curcpu
];
1181 addend
= xt_write_recseq_begin();
1182 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
) {
1183 ADD_COUNTER(iter
->counters
, paddc
[i
].bcnt
, paddc
[i
].pcnt
);
1186 xt_write_recseq_end(addend
);
1197 #ifdef CONFIG_COMPAT
1198 static inline void compat_release_entry(struct compat_arpt_entry
*e
)
1200 struct xt_entry_target
*t
;
1202 t
= compat_arpt_get_target(e
);
1203 module_put(t
->u
.kernel
.target
->me
);
1207 check_compat_entry_size_and_hooks(struct compat_arpt_entry
*e
,
1208 struct xt_table_info
*newinfo
,
1210 const unsigned char *base
,
1211 const unsigned char *limit
,
1212 const unsigned int *hook_entries
,
1213 const unsigned int *underflows
,
1216 struct xt_entry_target
*t
;
1217 struct xt_target
*target
;
1218 unsigned int entry_offset
;
1221 duprintf("check_compat_entry_size_and_hooks %p\n", e
);
1222 if ((unsigned long)e
% __alignof__(struct compat_arpt_entry
) != 0 ||
1223 (unsigned char *)e
+ sizeof(struct compat_arpt_entry
) >= limit
||
1224 (unsigned char *)e
+ e
->next_offset
> limit
) {
1225 duprintf("Bad offset %p, limit = %p\n", e
, limit
);
1229 if (e
->next_offset
< sizeof(struct compat_arpt_entry
) +
1230 sizeof(struct compat_xt_entry_target
)) {
1231 duprintf("checking: element %p size %u\n",
1236 /* For purposes of check_entry casting the compat entry is fine */
1237 ret
= check_entry((struct arpt_entry
*)e
);
1241 off
= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1242 entry_offset
= (void *)e
- (void *)base
;
1244 t
= compat_arpt_get_target(e
);
1245 target
= xt_request_find_target(NFPROTO_ARP
, t
->u
.user
.name
,
1246 t
->u
.user
.revision
);
1247 if (IS_ERR(target
)) {
1248 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1250 ret
= PTR_ERR(target
);
1253 t
->u
.kernel
.target
= target
;
1255 off
+= xt_compat_target_offset(target
);
1257 ret
= xt_compat_add_offset(NFPROTO_ARP
, entry_offset
, off
);
1259 goto release_target
;
1261 /* Check hooks & underflows */
1262 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
1263 if ((unsigned char *)e
- base
== hook_entries
[h
])
1264 newinfo
->hook_entry
[h
] = hook_entries
[h
];
1265 if ((unsigned char *)e
- base
== underflows
[h
])
1266 newinfo
->underflow
[h
] = underflows
[h
];
1269 /* Clear counters and comefrom */
1270 memset(&e
->counters
, 0, sizeof(e
->counters
));
1275 module_put(t
->u
.kernel
.target
->me
);
1281 compat_copy_entry_from_user(struct compat_arpt_entry
*e
, void **dstptr
,
1282 unsigned int *size
, const char *name
,
1283 struct xt_table_info
*newinfo
, unsigned char *base
)
1285 struct xt_entry_target
*t
;
1286 struct xt_target
*target
;
1287 struct arpt_entry
*de
;
1288 unsigned int origsize
;
1293 de
= (struct arpt_entry
*)*dstptr
;
1294 memcpy(de
, e
, sizeof(struct arpt_entry
));
1295 memcpy(&de
->counters
, &e
->counters
, sizeof(e
->counters
));
1297 *dstptr
+= sizeof(struct arpt_entry
);
1298 *size
+= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1300 de
->target_offset
= e
->target_offset
- (origsize
- *size
);
1301 t
= compat_arpt_get_target(e
);
1302 target
= t
->u
.kernel
.target
;
1303 xt_compat_target_from_user(t
, dstptr
, size
);
1305 de
->next_offset
= e
->next_offset
- (origsize
- *size
);
1306 for (h
= 0; h
< NF_ARP_NUMHOOKS
; h
++) {
1307 if ((unsigned char *)de
- base
< newinfo
->hook_entry
[h
])
1308 newinfo
->hook_entry
[h
] -= origsize
- *size
;
1309 if ((unsigned char *)de
- base
< newinfo
->underflow
[h
])
1310 newinfo
->underflow
[h
] -= origsize
- *size
;
1315 static int translate_compat_table(const char *name
,
1316 unsigned int valid_hooks
,
1317 struct xt_table_info
**pinfo
,
1319 unsigned int total_size
,
1320 unsigned int number
,
1321 unsigned int *hook_entries
,
1322 unsigned int *underflows
)
1325 struct xt_table_info
*newinfo
, *info
;
1326 void *pos
, *entry0
, *entry1
;
1327 struct compat_arpt_entry
*iter0
;
1328 struct arpt_entry
*iter1
;
1335 info
->number
= number
;
1337 /* Init all hooks to impossible value. */
1338 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1339 info
->hook_entry
[i
] = 0xFFFFFFFF;
1340 info
->underflow
[i
] = 0xFFFFFFFF;
1343 duprintf("translate_compat_table: size %u\n", info
->size
);
1345 xt_compat_lock(NFPROTO_ARP
);
1346 xt_compat_init_offsets(NFPROTO_ARP
, number
);
1347 /* Walk through entries, checking offsets. */
1348 xt_entry_foreach(iter0
, entry0
, total_size
) {
1349 ret
= check_compat_entry_size_and_hooks(iter0
, info
, &size
,
1351 entry0
+ total_size
,
1362 duprintf("translate_compat_table: %u not %u entries\n",
1367 /* Check hooks all assigned */
1368 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1369 /* Only hooks which are valid */
1370 if (!(valid_hooks
& (1 << i
)))
1372 if (info
->hook_entry
[i
] == 0xFFFFFFFF) {
1373 duprintf("Invalid hook entry %u %u\n",
1374 i
, hook_entries
[i
]);
1377 if (info
->underflow
[i
] == 0xFFFFFFFF) {
1378 duprintf("Invalid underflow %u %u\n",
1385 newinfo
= xt_alloc_table_info(size
);
1389 newinfo
->number
= number
;
1390 for (i
= 0; i
< NF_ARP_NUMHOOKS
; i
++) {
1391 newinfo
->hook_entry
[i
] = info
->hook_entry
[i
];
1392 newinfo
->underflow
[i
] = info
->underflow
[i
];
1394 entry1
= newinfo
->entries
[raw_smp_processor_id()];
1397 xt_entry_foreach(iter0
, entry0
, total_size
) {
1398 ret
= compat_copy_entry_from_user(iter0
, &pos
, &size
,
1399 name
, newinfo
, entry1
);
1403 xt_compat_flush_offsets(NFPROTO_ARP
);
1404 xt_compat_unlock(NFPROTO_ARP
);
1409 if (!mark_source_chains(newinfo
, valid_hooks
, entry1
))
1413 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1414 ret
= check_target(iter1
, name
);
1418 if (strcmp(arpt_get_target(iter1
)->u
.user
.name
,
1419 XT_ERROR_TARGET
) == 0)
1420 ++newinfo
->stacksize
;
1424 * The first i matches need cleanup_entry (calls ->destroy)
1425 * because they had called ->check already. The other j-i
1426 * entries need only release.
1430 xt_entry_foreach(iter0
, entry0
, newinfo
->size
) {
1435 compat_release_entry(iter0
);
1437 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1440 cleanup_entry(iter1
);
1442 xt_free_table_info(newinfo
);
1446 /* And one copy for every other CPU */
1447 for_each_possible_cpu(i
)
1448 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry1
)
1449 memcpy(newinfo
->entries
[i
], entry1
, newinfo
->size
);
1453 xt_free_table_info(info
);
1457 xt_free_table_info(newinfo
);
1459 xt_entry_foreach(iter0
, entry0
, total_size
) {
1462 compat_release_entry(iter0
);
1466 xt_compat_flush_offsets(NFPROTO_ARP
);
1467 xt_compat_unlock(NFPROTO_ARP
);
1471 struct compat_arpt_replace
{
1472 char name
[XT_TABLE_MAXNAMELEN
];
1476 u32 hook_entry
[NF_ARP_NUMHOOKS
];
1477 u32 underflow
[NF_ARP_NUMHOOKS
];
1479 compat_uptr_t counters
;
1480 struct compat_arpt_entry entries
[0];
1483 static int compat_do_replace(struct net
*net
, void __user
*user
,
1487 struct compat_arpt_replace tmp
;
1488 struct xt_table_info
*newinfo
;
1489 void *loc_cpu_entry
;
1490 struct arpt_entry
*iter
;
1492 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1495 /* overflow check */
1496 if (tmp
.size
>= INT_MAX
/ num_possible_cpus())
1498 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1500 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1502 newinfo
= xt_alloc_table_info(tmp
.size
);
1506 /* choose the copy that is on our node/cpu */
1507 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1508 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
), tmp
.size
) != 0) {
1513 ret
= translate_compat_table(tmp
.name
, tmp
.valid_hooks
,
1514 &newinfo
, &loc_cpu_entry
, tmp
.size
,
1515 tmp
.num_entries
, tmp
.hook_entry
,
1520 duprintf("compat_do_replace: Translated table\n");
1522 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1523 tmp
.num_counters
, compat_ptr(tmp
.counters
));
1525 goto free_newinfo_untrans
;
1528 free_newinfo_untrans
:
1529 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1530 cleanup_entry(iter
);
1532 xt_free_table_info(newinfo
);
1536 static int compat_do_arpt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1541 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1545 case ARPT_SO_SET_REPLACE
:
1546 ret
= compat_do_replace(sock_net(sk
), user
, len
);
1549 case ARPT_SO_SET_ADD_COUNTERS
:
1550 ret
= do_add_counters(sock_net(sk
), user
, len
, 1);
1554 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd
);
1561 static int compat_copy_entry_to_user(struct arpt_entry
*e
, void __user
**dstptr
,
1562 compat_uint_t
*size
,
1563 struct xt_counters
*counters
,
1566 struct xt_entry_target
*t
;
1567 struct compat_arpt_entry __user
*ce
;
1568 u_int16_t target_offset
, next_offset
;
1569 compat_uint_t origsize
;
1573 ce
= (struct compat_arpt_entry __user
*)*dstptr
;
1574 if (copy_to_user(ce
, e
, sizeof(struct arpt_entry
)) != 0 ||
1575 copy_to_user(&ce
->counters
, &counters
[i
],
1576 sizeof(counters
[i
])) != 0)
1579 *dstptr
+= sizeof(struct compat_arpt_entry
);
1580 *size
-= sizeof(struct arpt_entry
) - sizeof(struct compat_arpt_entry
);
1582 target_offset
= e
->target_offset
- (origsize
- *size
);
1584 t
= arpt_get_target(e
);
1585 ret
= xt_compat_target_to_user(t
, dstptr
, size
);
1588 next_offset
= e
->next_offset
- (origsize
- *size
);
1589 if (put_user(target_offset
, &ce
->target_offset
) != 0 ||
1590 put_user(next_offset
, &ce
->next_offset
) != 0)
1595 static int compat_copy_entries_to_user(unsigned int total_size
,
1596 struct xt_table
*table
,
1597 void __user
*userptr
)
1599 struct xt_counters
*counters
;
1600 const struct xt_table_info
*private = table
->private;
1604 void *loc_cpu_entry
;
1606 struct arpt_entry
*iter
;
1608 counters
= alloc_counters(table
);
1609 if (IS_ERR(counters
))
1610 return PTR_ERR(counters
);
1612 /* choose the copy on our node/cpu */
1613 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1616 xt_entry_foreach(iter
, loc_cpu_entry
, total_size
) {
1617 ret
= compat_copy_entry_to_user(iter
, &pos
,
1618 &size
, counters
, i
++);
1626 struct compat_arpt_get_entries
{
1627 char name
[XT_TABLE_MAXNAMELEN
];
1629 struct compat_arpt_entry entrytable
[0];
1632 static int compat_get_entries(struct net
*net
,
1633 struct compat_arpt_get_entries __user
*uptr
,
1637 struct compat_arpt_get_entries get
;
1640 if (*len
< sizeof(get
)) {
1641 duprintf("compat_get_entries: %u < %zu\n", *len
, sizeof(get
));
1644 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1646 if (*len
!= sizeof(struct compat_arpt_get_entries
) + get
.size
) {
1647 duprintf("compat_get_entries: %u != %zu\n",
1648 *len
, sizeof(get
) + get
.size
);
1652 xt_compat_lock(NFPROTO_ARP
);
1653 t
= xt_find_table_lock(net
, NFPROTO_ARP
, get
.name
);
1654 if (!IS_ERR_OR_NULL(t
)) {
1655 const struct xt_table_info
*private = t
->private;
1656 struct xt_table_info info
;
1658 duprintf("t->private->number = %u\n", private->number
);
1659 ret
= compat_table_info(private, &info
);
1660 if (!ret
&& get
.size
== info
.size
) {
1661 ret
= compat_copy_entries_to_user(private->size
,
1662 t
, uptr
->entrytable
);
1664 duprintf("compat_get_entries: I've got %u not %u!\n",
1665 private->size
, get
.size
);
1668 xt_compat_flush_offsets(NFPROTO_ARP
);
1672 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1674 xt_compat_unlock(NFPROTO_ARP
);
1678 static int do_arpt_get_ctl(struct sock
*, int, void __user
*, int *);
1680 static int compat_do_arpt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1685 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1689 case ARPT_SO_GET_INFO
:
1690 ret
= get_info(sock_net(sk
), user
, len
, 1);
1692 case ARPT_SO_GET_ENTRIES
:
1693 ret
= compat_get_entries(sock_net(sk
), user
, len
);
1696 ret
= do_arpt_get_ctl(sk
, cmd
, user
, len
);
1702 static int do_arpt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
, unsigned int len
)
1706 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1710 case ARPT_SO_SET_REPLACE
:
1711 ret
= do_replace(sock_net(sk
), user
, len
);
1714 case ARPT_SO_SET_ADD_COUNTERS
:
1715 ret
= do_add_counters(sock_net(sk
), user
, len
, 0);
1719 duprintf("do_arpt_set_ctl: unknown request %i\n", cmd
);
1726 static int do_arpt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
1730 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1734 case ARPT_SO_GET_INFO
:
1735 ret
= get_info(sock_net(sk
), user
, len
, 0);
1738 case ARPT_SO_GET_ENTRIES
:
1739 ret
= get_entries(sock_net(sk
), user
, len
);
1742 case ARPT_SO_GET_REVISION_TARGET
: {
1743 struct xt_get_revision rev
;
1745 if (*len
!= sizeof(rev
)) {
1749 if (copy_from_user(&rev
, user
, sizeof(rev
)) != 0) {
1753 rev
.name
[sizeof(rev
.name
)-1] = 0;
1755 try_then_request_module(xt_find_revision(NFPROTO_ARP
, rev
.name
,
1756 rev
.revision
, 1, &ret
),
1757 "arpt_%s", rev
.name
);
1762 duprintf("do_arpt_get_ctl: unknown request %i\n", cmd
);
1769 struct xt_table
*arpt_register_table(struct net
*net
,
1770 const struct xt_table
*table
,
1771 const struct arpt_replace
*repl
)
1774 struct xt_table_info
*newinfo
;
1775 struct xt_table_info bootstrap
= {0};
1776 void *loc_cpu_entry
;
1777 struct xt_table
*new_table
;
1779 newinfo
= xt_alloc_table_info(repl
->size
);
1785 /* choose the copy on our node/cpu */
1786 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1787 memcpy(loc_cpu_entry
, repl
->entries
, repl
->size
);
1789 ret
= translate_table(newinfo
, loc_cpu_entry
, repl
);
1790 duprintf("arpt_register_table: translate table gives %d\n", ret
);
1794 new_table
= xt_register_table(net
, table
, &bootstrap
, newinfo
);
1795 if (IS_ERR(new_table
)) {
1796 ret
= PTR_ERR(new_table
);
1802 xt_free_table_info(newinfo
);
1804 return ERR_PTR(ret
);
1807 void arpt_unregister_table(struct xt_table
*table
)
1809 struct xt_table_info
*private;
1810 void *loc_cpu_entry
;
1811 struct module
*table_owner
= table
->me
;
1812 struct arpt_entry
*iter
;
1814 private = xt_unregister_table(table
);
1816 /* Decrease module usage counts and free resources */
1817 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1818 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
)
1819 cleanup_entry(iter
);
1820 if (private->number
> private->initial_entries
)
1821 module_put(table_owner
);
1822 xt_free_table_info(private);
1825 /* The built-in targets: standard (NULL) and error. */
1826 static struct xt_target arpt_builtin_tg
[] __read_mostly
= {
1828 .name
= XT_STANDARD_TARGET
,
1829 .targetsize
= sizeof(int),
1830 .family
= NFPROTO_ARP
,
1831 #ifdef CONFIG_COMPAT
1832 .compatsize
= sizeof(compat_int_t
),
1833 .compat_from_user
= compat_standard_from_user
,
1834 .compat_to_user
= compat_standard_to_user
,
1838 .name
= XT_ERROR_TARGET
,
1839 .target
= arpt_error
,
1840 .targetsize
= XT_FUNCTION_MAXNAMELEN
,
1841 .family
= NFPROTO_ARP
,
1845 static struct nf_sockopt_ops arpt_sockopts
= {
1847 .set_optmin
= ARPT_BASE_CTL
,
1848 .set_optmax
= ARPT_SO_SET_MAX
+1,
1849 .set
= do_arpt_set_ctl
,
1850 #ifdef CONFIG_COMPAT
1851 .compat_set
= compat_do_arpt_set_ctl
,
1853 .get_optmin
= ARPT_BASE_CTL
,
1854 .get_optmax
= ARPT_SO_GET_MAX
+1,
1855 .get
= do_arpt_get_ctl
,
1856 #ifdef CONFIG_COMPAT
1857 .compat_get
= compat_do_arpt_get_ctl
,
1859 .owner
= THIS_MODULE
,
1862 static int __net_init
arp_tables_net_init(struct net
*net
)
1864 return xt_proto_init(net
, NFPROTO_ARP
);
1867 static void __net_exit
arp_tables_net_exit(struct net
*net
)
1869 xt_proto_fini(net
, NFPROTO_ARP
);
1872 static struct pernet_operations arp_tables_net_ops
= {
1873 .init
= arp_tables_net_init
,
1874 .exit
= arp_tables_net_exit
,
1877 static int __init
arp_tables_init(void)
1881 ret
= register_pernet_subsys(&arp_tables_net_ops
);
1885 /* No one else will be downing sem now, so we won't sleep */
1886 ret
= xt_register_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1890 /* Register setsockopt */
1891 ret
= nf_register_sockopt(&arpt_sockopts
);
1895 printk(KERN_INFO
"arp_tables: (C) 2002 David S. Miller\n");
1899 xt_unregister_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1901 unregister_pernet_subsys(&arp_tables_net_ops
);
1906 static void __exit
arp_tables_fini(void)
1908 nf_unregister_sockopt(&arpt_sockopts
);
1909 xt_unregister_targets(arpt_builtin_tg
, ARRAY_SIZE(arpt_builtin_tg
));
1910 unregister_pernet_subsys(&arp_tables_net_ops
);
1913 EXPORT_SYMBOL(arpt_register_table
);
1914 EXPORT_SYMBOL(arpt_unregister_table
);
1915 EXPORT_SYMBOL(arpt_do_table
);
1917 module_init(arp_tables_init
);
1918 module_exit(arp_tables_fini
);