2 * Packet matching code.
4 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
5 * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
6 * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/cache.h>
14 #include <linux/capability.h>
15 #include <linux/skbuff.h>
16 #include <linux/kmod.h>
17 #include <linux/vmalloc.h>
18 #include <linux/netdevice.h>
19 #include <linux/module.h>
20 #include <linux/icmp.h>
22 #include <net/compat.h>
23 #include <asm/uaccess.h>
24 #include <linux/mutex.h>
25 #include <linux/proc_fs.h>
26 #include <linux/err.h>
27 #include <linux/cpumask.h>
29 #include <linux/netfilter/x_tables.h>
30 #include <linux/netfilter_ipv4/ip_tables.h>
31 #include <net/netfilter/nf_log.h>
32 #include "../../netfilter/xt_repldata.h"
34 MODULE_LICENSE("GPL");
35 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
36 MODULE_DESCRIPTION("IPv4 packet filter");
38 /*#define DEBUG_IP_FIREWALL*/
39 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
40 /*#define DEBUG_IP_FIREWALL_USER*/
42 #ifdef DEBUG_IP_FIREWALL
43 #define dprintf(format, args...) pr_info(format , ## args)
45 #define dprintf(format, args...)
48 #ifdef DEBUG_IP_FIREWALL_USER
49 #define duprintf(format, args...) pr_info(format , ## args)
51 #define duprintf(format, args...)
54 #ifdef CONFIG_NETFILTER_DEBUG
55 #define IP_NF_ASSERT(x) WARN_ON(!(x))
57 #define IP_NF_ASSERT(x)
61 /* All the better to debug you with... */
66 void *ipt_alloc_initial_table(const struct xt_table
*info
)
68 return xt_alloc_initial_table(ipt
, IPT
);
70 EXPORT_SYMBOL_GPL(ipt_alloc_initial_table
);
72 /* Returns whether matches rule or not. */
73 /* Performance critical - called for every packet */
75 ip_packet_match(const struct iphdr
*ip
,
78 const struct ipt_ip
*ipinfo
,
83 #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
85 if (FWINV((ip
->saddr
&ipinfo
->smsk
.s_addr
) != ipinfo
->src
.s_addr
,
87 FWINV((ip
->daddr
&ipinfo
->dmsk
.s_addr
) != ipinfo
->dst
.s_addr
,
89 dprintf("Source or dest mismatch.\n");
91 dprintf("SRC: %pI4. Mask: %pI4. Target: %pI4.%s\n",
92 &ip
->saddr
, &ipinfo
->smsk
.s_addr
, &ipinfo
->src
.s_addr
,
93 ipinfo
->invflags
& IPT_INV_SRCIP
? " (INV)" : "");
94 dprintf("DST: %pI4 Mask: %pI4 Target: %pI4.%s\n",
95 &ip
->daddr
, &ipinfo
->dmsk
.s_addr
, &ipinfo
->dst
.s_addr
,
96 ipinfo
->invflags
& IPT_INV_DSTIP
? " (INV)" : "");
100 ret
= ifname_compare_aligned(indev
, ipinfo
->iniface
, ipinfo
->iniface_mask
);
102 if (FWINV(ret
!= 0, IPT_INV_VIA_IN
)) {
103 dprintf("VIA in mismatch (%s vs %s).%s\n",
104 indev
, ipinfo
->iniface
,
105 ipinfo
->invflags
& IPT_INV_VIA_IN
? " (INV)" : "");
109 ret
= ifname_compare_aligned(outdev
, ipinfo
->outiface
, ipinfo
->outiface_mask
);
111 if (FWINV(ret
!= 0, IPT_INV_VIA_OUT
)) {
112 dprintf("VIA out mismatch (%s vs %s).%s\n",
113 outdev
, ipinfo
->outiface
,
114 ipinfo
->invflags
& IPT_INV_VIA_OUT
? " (INV)" : "");
118 /* Check specific protocol */
120 FWINV(ip
->protocol
!= ipinfo
->proto
, IPT_INV_PROTO
)) {
121 dprintf("Packet protocol %hi does not match %hi.%s\n",
122 ip
->protocol
, ipinfo
->proto
,
123 ipinfo
->invflags
& IPT_INV_PROTO
? " (INV)" : "");
127 /* If we have a fragment rule but the packet is not a fragment
128 * then we return zero */
129 if (FWINV((ipinfo
->flags
&IPT_F_FRAG
) && !isfrag
, IPT_INV_FRAG
)) {
130 dprintf("Fragment rule but not fragment.%s\n",
131 ipinfo
->invflags
& IPT_INV_FRAG
? " (INV)" : "");
139 ip_checkentry(const struct ipt_ip
*ip
)
141 if (ip
->flags
& ~IPT_F_MASK
) {
142 duprintf("Unknown flag bits set: %08X\n",
143 ip
->flags
& ~IPT_F_MASK
);
146 if (ip
->invflags
& ~IPT_INV_MASK
) {
147 duprintf("Unknown invflag bits set: %08X\n",
148 ip
->invflags
& ~IPT_INV_MASK
);
155 ipt_error(struct sk_buff
*skb
, const struct xt_action_param
*par
)
157 net_info_ratelimited("error: `%s'\n", (const char *)par
->targinfo
);
162 /* Performance critical */
163 static inline struct ipt_entry
*
164 get_entry(const void *base
, unsigned int offset
)
166 return (struct ipt_entry
*)(base
+ offset
);
169 /* All zeroes == unconditional rule. */
170 /* Mildly perf critical (only if packet tracing is on) */
171 static inline bool unconditional(const struct ipt_entry
*e
)
173 static const struct ipt_ip uncond
;
175 return e
->target_offset
== sizeof(struct ipt_entry
) &&
176 memcmp(&e
->ip
, &uncond
, sizeof(uncond
)) == 0;
180 /* for const-correctness */
181 static inline const struct xt_entry_target
*
182 ipt_get_target_c(const struct ipt_entry
*e
)
184 return ipt_get_target((struct ipt_entry
*)e
);
187 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
188 static const char *const hooknames
[] = {
189 [NF_INET_PRE_ROUTING
] = "PREROUTING",
190 [NF_INET_LOCAL_IN
] = "INPUT",
191 [NF_INET_FORWARD
] = "FORWARD",
192 [NF_INET_LOCAL_OUT
] = "OUTPUT",
193 [NF_INET_POST_ROUTING
] = "POSTROUTING",
196 enum nf_ip_trace_comments
{
197 NF_IP_TRACE_COMMENT_RULE
,
198 NF_IP_TRACE_COMMENT_RETURN
,
199 NF_IP_TRACE_COMMENT_POLICY
,
202 static const char *const comments
[] = {
203 [NF_IP_TRACE_COMMENT_RULE
] = "rule",
204 [NF_IP_TRACE_COMMENT_RETURN
] = "return",
205 [NF_IP_TRACE_COMMENT_POLICY
] = "policy",
208 static struct nf_loginfo trace_loginfo
= {
209 .type
= NF_LOG_TYPE_LOG
,
213 .logflags
= NF_LOG_MASK
,
218 /* Mildly perf critical (only if packet tracing is on) */
220 get_chainname_rulenum(const struct ipt_entry
*s
, const struct ipt_entry
*e
,
221 const char *hookname
, const char **chainname
,
222 const char **comment
, unsigned int *rulenum
)
224 const struct xt_standard_target
*t
= (void *)ipt_get_target_c(s
);
226 if (strcmp(t
->target
.u
.kernel
.target
->name
, XT_ERROR_TARGET
) == 0) {
227 /* Head of user chain: ERROR target with chainname */
228 *chainname
= t
->target
.data
;
233 if (unconditional(s
) &&
234 strcmp(t
->target
.u
.kernel
.target
->name
,
235 XT_STANDARD_TARGET
) == 0 &&
237 /* Tail of chains: STANDARD target (return/policy) */
238 *comment
= *chainname
== hookname
239 ? comments
[NF_IP_TRACE_COMMENT_POLICY
]
240 : comments
[NF_IP_TRACE_COMMENT_RETURN
];
249 static void trace_packet(struct net
*net
,
250 const struct sk_buff
*skb
,
252 const struct net_device
*in
,
253 const struct net_device
*out
,
254 const char *tablename
,
255 const struct xt_table_info
*private,
256 const struct ipt_entry
*e
)
258 const struct ipt_entry
*root
;
259 const char *hookname
, *chainname
, *comment
;
260 const struct ipt_entry
*iter
;
261 unsigned int rulenum
= 0;
263 root
= get_entry(private->entries
, private->hook_entry
[hook
]);
265 hookname
= chainname
= hooknames
[hook
];
266 comment
= comments
[NF_IP_TRACE_COMMENT_RULE
];
268 xt_entry_foreach(iter
, root
, private->size
- private->hook_entry
[hook
])
269 if (get_chainname_rulenum(iter
, e
, hookname
,
270 &chainname
, &comment
, &rulenum
) != 0)
273 nf_log_trace(net
, AF_INET
, hook
, skb
, in
, out
, &trace_loginfo
,
274 "TRACE: %s:%s:%s:%u ",
275 tablename
, chainname
, comment
, rulenum
);
280 struct ipt_entry
*ipt_next_entry(const struct ipt_entry
*entry
)
282 return (void *)entry
+ entry
->next_offset
;
285 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
287 ipt_do_table(struct sk_buff
*skb
,
288 const struct nf_hook_state
*state
,
289 struct xt_table
*table
)
291 unsigned int hook
= state
->hook
;
292 static const char nulldevname
[IFNAMSIZ
] __attribute__((aligned(sizeof(long))));
293 const struct iphdr
*ip
;
294 /* Initializing verdict to NF_DROP keeps gcc happy. */
295 unsigned int verdict
= NF_DROP
;
296 const char *indev
, *outdev
;
297 const void *table_base
;
298 struct ipt_entry
*e
, **jumpstack
;
299 unsigned int stackidx
, cpu
;
300 const struct xt_table_info
*private;
301 struct xt_action_param acpar
;
307 indev
= state
->in
? state
->in
->name
: nulldevname
;
308 outdev
= state
->out
? state
->out
->name
: nulldevname
;
309 /* We handle fragments by dealing with the first fragment as
310 * if it was a normal packet. All other fragments are treated
311 * normally, except that they will NEVER match rules that ask
312 * things we don't know, ie. tcp syn flag or ports). If the
313 * rule is also a fragment-specific rule, non-fragments won't
315 acpar
.fragoff
= ntohs(ip
->frag_off
) & IP_OFFSET
;
316 acpar
.thoff
= ip_hdrlen(skb
);
317 acpar
.hotdrop
= false;
318 acpar
.net
= state
->net
;
319 acpar
.in
= state
->in
;
320 acpar
.out
= state
->out
;
321 acpar
.family
= NFPROTO_IPV4
;
322 acpar
.hooknum
= hook
;
324 IP_NF_ASSERT(table
->valid_hooks
& (1 << hook
));
326 addend
= xt_write_recseq_begin();
327 private = table
->private;
328 cpu
= smp_processor_id();
330 * Ensure we load private-> members after we've fetched the base
333 smp_read_barrier_depends();
334 table_base
= private->entries
;
335 jumpstack
= (struct ipt_entry
**)private->jumpstack
[cpu
];
337 /* Switch to alternate jumpstack if we're being invoked via TEE.
338 * TEE issues XT_CONTINUE verdict on original skb so we must not
339 * clobber the jumpstack.
341 * For recursion via REJECT or SYNPROXY the stack will be clobbered
342 * but it is no problem since absolute verdict is issued by these.
344 if (static_key_false(&xt_tee_enabled
))
345 jumpstack
+= private->stacksize
* __this_cpu_read(nf_skb_duplicated
);
347 e
= get_entry(table_base
, private->hook_entry
[hook
]);
349 pr_debug("Entering %s(hook %u), UF %p\n",
351 get_entry(table_base
, private->underflow
[hook
]));
354 const struct xt_entry_target
*t
;
355 const struct xt_entry_match
*ematch
;
356 struct xt_counters
*counter
;
359 if (!ip_packet_match(ip
, indev
, outdev
,
360 &e
->ip
, acpar
.fragoff
)) {
362 e
= ipt_next_entry(e
);
366 xt_ematch_foreach(ematch
, e
) {
367 acpar
.match
= ematch
->u
.kernel
.match
;
368 acpar
.matchinfo
= ematch
->data
;
369 if (!acpar
.match
->match(skb
, &acpar
))
373 counter
= xt_get_this_cpu_counter(&e
->counters
);
374 ADD_COUNTER(*counter
, skb
->len
, 1);
376 t
= ipt_get_target(e
);
377 IP_NF_ASSERT(t
->u
.kernel
.target
);
379 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
380 /* The packet is traced: log it */
381 if (unlikely(skb
->nf_trace
))
382 trace_packet(state
->net
, skb
, hook
, state
->in
,
383 state
->out
, table
->name
, private, e
);
385 /* Standard target? */
386 if (!t
->u
.kernel
.target
->target
) {
389 v
= ((struct xt_standard_target
*)t
)->verdict
;
391 /* Pop from stack? */
392 if (v
!= XT_RETURN
) {
393 verdict
= (unsigned int)(-v
) - 1;
397 e
= get_entry(table_base
,
398 private->underflow
[hook
]);
399 pr_debug("Underflow (this is normal) "
402 e
= jumpstack
[--stackidx
];
403 pr_debug("Pulled %p out from pos %u\n",
405 e
= ipt_next_entry(e
);
409 if (table_base
+ v
!= ipt_next_entry(e
) &&
410 !(e
->ip
.flags
& IPT_F_GOTO
)) {
411 jumpstack
[stackidx
++] = e
;
412 pr_debug("Pushed %p into pos %u\n",
416 e
= get_entry(table_base
, v
);
420 acpar
.target
= t
->u
.kernel
.target
;
421 acpar
.targinfo
= t
->data
;
423 verdict
= t
->u
.kernel
.target
->target(skb
, &acpar
);
424 /* Target might have changed stuff. */
426 if (verdict
== XT_CONTINUE
)
427 e
= ipt_next_entry(e
);
431 } while (!acpar
.hotdrop
);
432 pr_debug("Exiting %s; sp at %u\n", __func__
, stackidx
);
434 xt_write_recseq_end(addend
);
437 #ifdef DEBUG_ALLOW_ALL
446 /* Figures out from what hook each rule can be called: returns 0 if
447 there are loops. Puts hook bitmask in comefrom. */
449 mark_source_chains(const struct xt_table_info
*newinfo
,
450 unsigned int valid_hooks
, void *entry0
)
454 /* No recursion; use packet counter to save back ptrs (reset
455 to 0 as we leave), and comefrom to save source hook bitmask */
456 for (hook
= 0; hook
< NF_INET_NUMHOOKS
; hook
++) {
457 unsigned int pos
= newinfo
->hook_entry
[hook
];
458 struct ipt_entry
*e
= (struct ipt_entry
*)(entry0
+ pos
);
460 if (!(valid_hooks
& (1 << hook
)))
463 /* Set initial back pointer. */
464 e
->counters
.pcnt
= pos
;
467 const struct xt_standard_target
*t
468 = (void *)ipt_get_target_c(e
);
469 int visited
= e
->comefrom
& (1 << hook
);
471 if (e
->comefrom
& (1 << NF_INET_NUMHOOKS
)) {
472 pr_err("iptables: loop hook %u pos %u %08X.\n",
473 hook
, pos
, e
->comefrom
);
476 e
->comefrom
|= ((1 << hook
) | (1 << NF_INET_NUMHOOKS
));
478 /* Unconditional return/END. */
479 if ((unconditional(e
) &&
480 (strcmp(t
->target
.u
.user
.name
,
481 XT_STANDARD_TARGET
) == 0) &&
482 t
->verdict
< 0) || visited
) {
483 unsigned int oldpos
, size
;
485 if ((strcmp(t
->target
.u
.user
.name
,
486 XT_STANDARD_TARGET
) == 0) &&
487 t
->verdict
< -NF_MAX_VERDICT
- 1) {
488 duprintf("mark_source_chains: bad "
489 "negative verdict (%i)\n",
494 /* Return: backtrack through the last
497 e
->comefrom
^= (1<<NF_INET_NUMHOOKS
);
498 #ifdef DEBUG_IP_FIREWALL_USER
500 & (1 << NF_INET_NUMHOOKS
)) {
501 duprintf("Back unset "
508 pos
= e
->counters
.pcnt
;
509 e
->counters
.pcnt
= 0;
511 /* We're at the start. */
515 e
= (struct ipt_entry
*)
517 } while (oldpos
== pos
+ e
->next_offset
);
520 size
= e
->next_offset
;
521 e
= (struct ipt_entry
*)
522 (entry0
+ pos
+ size
);
523 e
->counters
.pcnt
= pos
;
526 int newpos
= t
->verdict
;
528 if (strcmp(t
->target
.u
.user
.name
,
529 XT_STANDARD_TARGET
) == 0 &&
531 if (newpos
> newinfo
->size
-
532 sizeof(struct ipt_entry
)) {
533 duprintf("mark_source_chains: "
534 "bad verdict (%i)\n",
538 /* This a jump; chase it. */
539 duprintf("Jump rule %u -> %u\n",
542 /* ... this is a fallthru */
543 newpos
= pos
+ e
->next_offset
;
545 e
= (struct ipt_entry
*)
547 e
->counters
.pcnt
= pos
;
552 duprintf("Finished chain %u\n", hook
);
557 static void cleanup_match(struct xt_entry_match
*m
, struct net
*net
)
559 struct xt_mtdtor_param par
;
562 par
.match
= m
->u
.kernel
.match
;
563 par
.matchinfo
= m
->data
;
564 par
.family
= NFPROTO_IPV4
;
565 if (par
.match
->destroy
!= NULL
)
566 par
.match
->destroy(&par
);
567 module_put(par
.match
->me
);
571 check_entry(const struct ipt_entry
*e
)
573 const struct xt_entry_target
*t
;
575 if (!ip_checkentry(&e
->ip
))
578 if (e
->target_offset
+ sizeof(struct xt_entry_target
) >
582 t
= ipt_get_target_c(e
);
583 if (e
->target_offset
+ t
->u
.target_size
> e
->next_offset
)
590 check_match(struct xt_entry_match
*m
, struct xt_mtchk_param
*par
)
592 const struct ipt_ip
*ip
= par
->entryinfo
;
595 par
->match
= m
->u
.kernel
.match
;
596 par
->matchinfo
= m
->data
;
598 ret
= xt_check_match(par
, m
->u
.match_size
- sizeof(*m
),
599 ip
->proto
, ip
->invflags
& IPT_INV_PROTO
);
601 duprintf("check failed for `%s'.\n", par
->match
->name
);
608 find_check_match(struct xt_entry_match
*m
, struct xt_mtchk_param
*par
)
610 struct xt_match
*match
;
613 match
= xt_request_find_match(NFPROTO_IPV4
, m
->u
.user
.name
,
616 duprintf("find_check_match: `%s' not found\n", m
->u
.user
.name
);
617 return PTR_ERR(match
);
619 m
->u
.kernel
.match
= match
;
621 ret
= check_match(m
, par
);
627 module_put(m
->u
.kernel
.match
->me
);
631 static int check_target(struct ipt_entry
*e
, struct net
*net
, const char *name
)
633 struct xt_entry_target
*t
= ipt_get_target(e
);
634 struct xt_tgchk_param par
= {
638 .target
= t
->u
.kernel
.target
,
640 .hook_mask
= e
->comefrom
,
641 .family
= NFPROTO_IPV4
,
645 ret
= xt_check_target(&par
, t
->u
.target_size
- sizeof(*t
),
646 e
->ip
.proto
, e
->ip
.invflags
& IPT_INV_PROTO
);
648 duprintf("check failed for `%s'.\n",
649 t
->u
.kernel
.target
->name
);
656 find_check_entry(struct ipt_entry
*e
, struct net
*net
, const char *name
,
659 struct xt_entry_target
*t
;
660 struct xt_target
*target
;
663 struct xt_mtchk_param mtpar
;
664 struct xt_entry_match
*ematch
;
666 e
->counters
.pcnt
= xt_percpu_counter_alloc();
667 if (IS_ERR_VALUE(e
->counters
.pcnt
))
673 mtpar
.entryinfo
= &e
->ip
;
674 mtpar
.hook_mask
= e
->comefrom
;
675 mtpar
.family
= NFPROTO_IPV4
;
676 xt_ematch_foreach(ematch
, e
) {
677 ret
= find_check_match(ematch
, &mtpar
);
679 goto cleanup_matches
;
683 t
= ipt_get_target(e
);
684 target
= xt_request_find_target(NFPROTO_IPV4
, t
->u
.user
.name
,
686 if (IS_ERR(target
)) {
687 duprintf("find_check_entry: `%s' not found\n", t
->u
.user
.name
);
688 ret
= PTR_ERR(target
);
689 goto cleanup_matches
;
691 t
->u
.kernel
.target
= target
;
693 ret
= check_target(e
, net
, name
);
699 module_put(t
->u
.kernel
.target
->me
);
701 xt_ematch_foreach(ematch
, e
) {
704 cleanup_match(ematch
, net
);
707 xt_percpu_counter_free(e
->counters
.pcnt
);
712 static bool check_underflow(const struct ipt_entry
*e
)
714 const struct xt_entry_target
*t
;
715 unsigned int verdict
;
717 if (!unconditional(e
))
719 t
= ipt_get_target_c(e
);
720 if (strcmp(t
->u
.user
.name
, XT_STANDARD_TARGET
) != 0)
722 verdict
= ((struct xt_standard_target
*)t
)->verdict
;
723 verdict
= -verdict
- 1;
724 return verdict
== NF_DROP
|| verdict
== NF_ACCEPT
;
728 check_entry_size_and_hooks(struct ipt_entry
*e
,
729 struct xt_table_info
*newinfo
,
730 const unsigned char *base
,
731 const unsigned char *limit
,
732 const unsigned int *hook_entries
,
733 const unsigned int *underflows
,
734 unsigned int valid_hooks
)
739 if ((unsigned long)e
% __alignof__(struct ipt_entry
) != 0 ||
740 (unsigned char *)e
+ sizeof(struct ipt_entry
) >= limit
||
741 (unsigned char *)e
+ e
->next_offset
> limit
) {
742 duprintf("Bad offset %p\n", e
);
747 < sizeof(struct ipt_entry
) + sizeof(struct xt_entry_target
)) {
748 duprintf("checking: element %p size %u\n",
753 err
= check_entry(e
);
757 /* Check hooks & underflows */
758 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
759 if (!(valid_hooks
& (1 << h
)))
761 if ((unsigned char *)e
- base
== hook_entries
[h
])
762 newinfo
->hook_entry
[h
] = hook_entries
[h
];
763 if ((unsigned char *)e
- base
== underflows
[h
]) {
764 if (!check_underflow(e
)) {
765 pr_debug("Underflows must be unconditional and "
766 "use the STANDARD target with "
770 newinfo
->underflow
[h
] = underflows
[h
];
774 /* Clear counters and comefrom */
775 e
->counters
= ((struct xt_counters
) { 0, 0 });
781 cleanup_entry(struct ipt_entry
*e
, struct net
*net
)
783 struct xt_tgdtor_param par
;
784 struct xt_entry_target
*t
;
785 struct xt_entry_match
*ematch
;
787 /* Cleanup all matches */
788 xt_ematch_foreach(ematch
, e
)
789 cleanup_match(ematch
, net
);
790 t
= ipt_get_target(e
);
793 par
.target
= t
->u
.kernel
.target
;
794 par
.targinfo
= t
->data
;
795 par
.family
= NFPROTO_IPV4
;
796 if (par
.target
->destroy
!= NULL
)
797 par
.target
->destroy(&par
);
798 module_put(par
.target
->me
);
799 xt_percpu_counter_free(e
->counters
.pcnt
);
802 /* Checks and translates the user-supplied table segment (held in
805 translate_table(struct net
*net
, struct xt_table_info
*newinfo
, void *entry0
,
806 const struct ipt_replace
*repl
)
808 struct ipt_entry
*iter
;
812 newinfo
->size
= repl
->size
;
813 newinfo
->number
= repl
->num_entries
;
815 /* Init all hooks to impossible value. */
816 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
817 newinfo
->hook_entry
[i
] = 0xFFFFFFFF;
818 newinfo
->underflow
[i
] = 0xFFFFFFFF;
821 duprintf("translate_table: size %u\n", newinfo
->size
);
823 /* Walk through entries, checking offsets. */
824 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
825 ret
= check_entry_size_and_hooks(iter
, newinfo
, entry0
,
833 if (strcmp(ipt_get_target(iter
)->u
.user
.name
,
834 XT_ERROR_TARGET
) == 0)
835 ++newinfo
->stacksize
;
838 if (i
!= repl
->num_entries
) {
839 duprintf("translate_table: %u not %u entries\n",
840 i
, repl
->num_entries
);
844 /* Check hooks all assigned */
845 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
846 /* Only hooks which are valid */
847 if (!(repl
->valid_hooks
& (1 << i
)))
849 if (newinfo
->hook_entry
[i
] == 0xFFFFFFFF) {
850 duprintf("Invalid hook entry %u %u\n",
851 i
, repl
->hook_entry
[i
]);
854 if (newinfo
->underflow
[i
] == 0xFFFFFFFF) {
855 duprintf("Invalid underflow %u %u\n",
856 i
, repl
->underflow
[i
]);
861 if (!mark_source_chains(newinfo
, repl
->valid_hooks
, entry0
))
864 /* Finally, each sanity check must pass */
866 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
867 ret
= find_check_entry(iter
, net
, repl
->name
, repl
->size
);
874 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
877 cleanup_entry(iter
, net
);
886 get_counters(const struct xt_table_info
*t
,
887 struct xt_counters counters
[])
889 struct ipt_entry
*iter
;
893 for_each_possible_cpu(cpu
) {
894 seqcount_t
*s
= &per_cpu(xt_recseq
, cpu
);
897 xt_entry_foreach(iter
, t
->entries
, t
->size
) {
898 struct xt_counters
*tmp
;
902 tmp
= xt_get_per_cpu_counter(&iter
->counters
, cpu
);
904 start
= read_seqcount_begin(s
);
907 } while (read_seqcount_retry(s
, start
));
909 ADD_COUNTER(counters
[i
], bcnt
, pcnt
);
910 ++i
; /* macro does multi eval of i */
915 static struct xt_counters
*alloc_counters(const struct xt_table
*table
)
917 unsigned int countersize
;
918 struct xt_counters
*counters
;
919 const struct xt_table_info
*private = table
->private;
921 /* We need atomic snapshot of counters: rest doesn't change
922 (other than comefrom, which userspace doesn't care
924 countersize
= sizeof(struct xt_counters
) * private->number
;
925 counters
= vzalloc(countersize
);
927 if (counters
== NULL
)
928 return ERR_PTR(-ENOMEM
);
930 get_counters(private, counters
);
936 copy_entries_to_user(unsigned int total_size
,
937 const struct xt_table
*table
,
938 void __user
*userptr
)
940 unsigned int off
, num
;
941 const struct ipt_entry
*e
;
942 struct xt_counters
*counters
;
943 const struct xt_table_info
*private = table
->private;
945 const void *loc_cpu_entry
;
947 counters
= alloc_counters(table
);
948 if (IS_ERR(counters
))
949 return PTR_ERR(counters
);
951 loc_cpu_entry
= private->entries
;
952 if (copy_to_user(userptr
, loc_cpu_entry
, total_size
) != 0) {
957 /* FIXME: use iterator macros --RR */
958 /* ... then go back and fix counters and names */
959 for (off
= 0, num
= 0; off
< total_size
; off
+= e
->next_offset
, num
++){
961 const struct xt_entry_match
*m
;
962 const struct xt_entry_target
*t
;
964 e
= (struct ipt_entry
*)(loc_cpu_entry
+ off
);
965 if (copy_to_user(userptr
+ off
966 + offsetof(struct ipt_entry
, counters
),
968 sizeof(counters
[num
])) != 0) {
973 for (i
= sizeof(struct ipt_entry
);
974 i
< e
->target_offset
;
975 i
+= m
->u
.match_size
) {
978 if (copy_to_user(userptr
+ off
+ i
979 + offsetof(struct xt_entry_match
,
981 m
->u
.kernel
.match
->name
,
982 strlen(m
->u
.kernel
.match
->name
)+1)
989 t
= ipt_get_target_c(e
);
990 if (copy_to_user(userptr
+ off
+ e
->target_offset
991 + offsetof(struct xt_entry_target
,
993 t
->u
.kernel
.target
->name
,
994 strlen(t
->u
.kernel
.target
->name
)+1) != 0) {
1005 #ifdef CONFIG_COMPAT
1006 static void compat_standard_from_user(void *dst
, const void *src
)
1008 int v
= *(compat_int_t
*)src
;
1011 v
+= xt_compat_calc_jump(AF_INET
, v
);
1012 memcpy(dst
, &v
, sizeof(v
));
1015 static int compat_standard_to_user(void __user
*dst
, const void *src
)
1017 compat_int_t cv
= *(int *)src
;
1020 cv
-= xt_compat_calc_jump(AF_INET
, cv
);
1021 return copy_to_user(dst
, &cv
, sizeof(cv
)) ? -EFAULT
: 0;
1024 static int compat_calc_entry(const struct ipt_entry
*e
,
1025 const struct xt_table_info
*info
,
1026 const void *base
, struct xt_table_info
*newinfo
)
1028 const struct xt_entry_match
*ematch
;
1029 const struct xt_entry_target
*t
;
1030 unsigned int entry_offset
;
1033 off
= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1034 entry_offset
= (void *)e
- base
;
1035 xt_ematch_foreach(ematch
, e
)
1036 off
+= xt_compat_match_offset(ematch
->u
.kernel
.match
);
1037 t
= ipt_get_target_c(e
);
1038 off
+= xt_compat_target_offset(t
->u
.kernel
.target
);
1039 newinfo
->size
-= off
;
1040 ret
= xt_compat_add_offset(AF_INET
, entry_offset
, off
);
1044 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1045 if (info
->hook_entry
[i
] &&
1046 (e
< (struct ipt_entry
*)(base
+ info
->hook_entry
[i
])))
1047 newinfo
->hook_entry
[i
] -= off
;
1048 if (info
->underflow
[i
] &&
1049 (e
< (struct ipt_entry
*)(base
+ info
->underflow
[i
])))
1050 newinfo
->underflow
[i
] -= off
;
1055 static int compat_table_info(const struct xt_table_info
*info
,
1056 struct xt_table_info
*newinfo
)
1058 struct ipt_entry
*iter
;
1059 const void *loc_cpu_entry
;
1062 if (!newinfo
|| !info
)
1065 /* we dont care about newinfo->entries */
1066 memcpy(newinfo
, info
, offsetof(struct xt_table_info
, entries
));
1067 newinfo
->initial_entries
= 0;
1068 loc_cpu_entry
= info
->entries
;
1069 xt_compat_init_offsets(AF_INET
, info
->number
);
1070 xt_entry_foreach(iter
, loc_cpu_entry
, info
->size
) {
1071 ret
= compat_calc_entry(iter
, info
, loc_cpu_entry
, newinfo
);
1079 static int get_info(struct net
*net
, void __user
*user
,
1080 const int *len
, int compat
)
1082 char name
[XT_TABLE_MAXNAMELEN
];
1086 if (*len
!= sizeof(struct ipt_getinfo
)) {
1087 duprintf("length %u != %zu\n", *len
,
1088 sizeof(struct ipt_getinfo
));
1092 if (copy_from_user(name
, user
, sizeof(name
)) != 0)
1095 name
[XT_TABLE_MAXNAMELEN
-1] = '\0';
1096 #ifdef CONFIG_COMPAT
1098 xt_compat_lock(AF_INET
);
1100 t
= try_then_request_module(xt_find_table_lock(net
, AF_INET
, name
),
1101 "iptable_%s", name
);
1102 if (!IS_ERR_OR_NULL(t
)) {
1103 struct ipt_getinfo info
;
1104 const struct xt_table_info
*private = t
->private;
1105 #ifdef CONFIG_COMPAT
1106 struct xt_table_info tmp
;
1109 ret
= compat_table_info(private, &tmp
);
1110 xt_compat_flush_offsets(AF_INET
);
1114 memset(&info
, 0, sizeof(info
));
1115 info
.valid_hooks
= t
->valid_hooks
;
1116 memcpy(info
.hook_entry
, private->hook_entry
,
1117 sizeof(info
.hook_entry
));
1118 memcpy(info
.underflow
, private->underflow
,
1119 sizeof(info
.underflow
));
1120 info
.num_entries
= private->number
;
1121 info
.size
= private->size
;
1122 strcpy(info
.name
, name
);
1124 if (copy_to_user(user
, &info
, *len
) != 0)
1132 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1133 #ifdef CONFIG_COMPAT
1135 xt_compat_unlock(AF_INET
);
1141 get_entries(struct net
*net
, struct ipt_get_entries __user
*uptr
,
1145 struct ipt_get_entries get
;
1148 if (*len
< sizeof(get
)) {
1149 duprintf("get_entries: %u < %zu\n", *len
, sizeof(get
));
1152 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1154 if (*len
!= sizeof(struct ipt_get_entries
) + get
.size
) {
1155 duprintf("get_entries: %u != %zu\n",
1156 *len
, sizeof(get
) + get
.size
);
1159 get
.name
[sizeof(get
.name
) - 1] = '\0';
1161 t
= xt_find_table_lock(net
, AF_INET
, get
.name
);
1162 if (!IS_ERR_OR_NULL(t
)) {
1163 const struct xt_table_info
*private = t
->private;
1164 duprintf("t->private->number = %u\n", private->number
);
1165 if (get
.size
== private->size
)
1166 ret
= copy_entries_to_user(private->size
,
1167 t
, uptr
->entrytable
);
1169 duprintf("get_entries: I've got %u not %u!\n",
1170 private->size
, get
.size
);
1176 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1182 __do_replace(struct net
*net
, const char *name
, unsigned int valid_hooks
,
1183 struct xt_table_info
*newinfo
, unsigned int num_counters
,
1184 void __user
*counters_ptr
)
1188 struct xt_table_info
*oldinfo
;
1189 struct xt_counters
*counters
;
1190 struct ipt_entry
*iter
;
1193 counters
= vzalloc(num_counters
* sizeof(struct xt_counters
));
1199 t
= try_then_request_module(xt_find_table_lock(net
, AF_INET
, name
),
1200 "iptable_%s", name
);
1201 if (IS_ERR_OR_NULL(t
)) {
1202 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1203 goto free_newinfo_counters_untrans
;
1207 if (valid_hooks
!= t
->valid_hooks
) {
1208 duprintf("Valid hook crap: %08X vs %08X\n",
1209 valid_hooks
, t
->valid_hooks
);
1214 oldinfo
= xt_replace_table(t
, num_counters
, newinfo
, &ret
);
1218 /* Update module usage count based on number of rules */
1219 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1220 oldinfo
->number
, oldinfo
->initial_entries
, newinfo
->number
);
1221 if ((oldinfo
->number
> oldinfo
->initial_entries
) ||
1222 (newinfo
->number
<= oldinfo
->initial_entries
))
1224 if ((oldinfo
->number
> oldinfo
->initial_entries
) &&
1225 (newinfo
->number
<= oldinfo
->initial_entries
))
1228 /* Get the old counters, and synchronize with replace */
1229 get_counters(oldinfo
, counters
);
1231 /* Decrease module usage counts and free resource */
1232 xt_entry_foreach(iter
, oldinfo
->entries
, oldinfo
->size
)
1233 cleanup_entry(iter
, net
);
1235 xt_free_table_info(oldinfo
);
1236 if (copy_to_user(counters_ptr
, counters
,
1237 sizeof(struct xt_counters
) * num_counters
) != 0) {
1238 /* Silent error, can't fail, new table is already in place */
1239 net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n");
1248 free_newinfo_counters_untrans
:
1255 do_replace(struct net
*net
, const void __user
*user
, unsigned int len
)
1258 struct ipt_replace tmp
;
1259 struct xt_table_info
*newinfo
;
1260 void *loc_cpu_entry
;
1261 struct ipt_entry
*iter
;
1263 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1266 /* overflow check */
1267 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1269 if (tmp
.num_counters
== 0)
1272 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1274 newinfo
= xt_alloc_table_info(tmp
.size
);
1278 loc_cpu_entry
= newinfo
->entries
;
1279 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1285 ret
= translate_table(net
, newinfo
, loc_cpu_entry
, &tmp
);
1289 duprintf("Translated table\n");
1291 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1292 tmp
.num_counters
, tmp
.counters
);
1294 goto free_newinfo_untrans
;
1297 free_newinfo_untrans
:
1298 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1299 cleanup_entry(iter
, net
);
1301 xt_free_table_info(newinfo
);
1306 do_add_counters(struct net
*net
, const void __user
*user
,
1307 unsigned int len
, int compat
)
1310 struct xt_counters_info tmp
;
1311 struct xt_counters
*paddc
;
1312 unsigned int num_counters
;
1317 const struct xt_table_info
*private;
1319 struct ipt_entry
*iter
;
1320 unsigned int addend
;
1321 #ifdef CONFIG_COMPAT
1322 struct compat_xt_counters_info compat_tmp
;
1326 size
= sizeof(struct compat_xt_counters_info
);
1331 size
= sizeof(struct xt_counters_info
);
1334 if (copy_from_user(ptmp
, user
, size
) != 0)
1337 #ifdef CONFIG_COMPAT
1339 num_counters
= compat_tmp
.num_counters
;
1340 name
= compat_tmp
.name
;
1344 num_counters
= tmp
.num_counters
;
1348 if (len
!= size
+ num_counters
* sizeof(struct xt_counters
))
1351 paddc
= vmalloc(len
- size
);
1355 if (copy_from_user(paddc
, user
+ size
, len
- size
) != 0) {
1360 t
= xt_find_table_lock(net
, AF_INET
, name
);
1361 if (IS_ERR_OR_NULL(t
)) {
1362 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1367 private = t
->private;
1368 if (private->number
!= num_counters
) {
1370 goto unlock_up_free
;
1374 addend
= xt_write_recseq_begin();
1375 xt_entry_foreach(iter
, private->entries
, private->size
) {
1376 struct xt_counters
*tmp
;
1378 tmp
= xt_get_this_cpu_counter(&iter
->counters
);
1379 ADD_COUNTER(*tmp
, paddc
[i
].bcnt
, paddc
[i
].pcnt
);
1382 xt_write_recseq_end(addend
);
1393 #ifdef CONFIG_COMPAT
1394 struct compat_ipt_replace
{
1395 char name
[XT_TABLE_MAXNAMELEN
];
1399 u32 hook_entry
[NF_INET_NUMHOOKS
];
1400 u32 underflow
[NF_INET_NUMHOOKS
];
1402 compat_uptr_t counters
; /* struct xt_counters * */
1403 struct compat_ipt_entry entries
[0];
1407 compat_copy_entry_to_user(struct ipt_entry
*e
, void __user
**dstptr
,
1408 unsigned int *size
, struct xt_counters
*counters
,
1411 struct xt_entry_target
*t
;
1412 struct compat_ipt_entry __user
*ce
;
1413 u_int16_t target_offset
, next_offset
;
1414 compat_uint_t origsize
;
1415 const struct xt_entry_match
*ematch
;
1419 ce
= (struct compat_ipt_entry __user
*)*dstptr
;
1420 if (copy_to_user(ce
, e
, sizeof(struct ipt_entry
)) != 0 ||
1421 copy_to_user(&ce
->counters
, &counters
[i
],
1422 sizeof(counters
[i
])) != 0)
1425 *dstptr
+= sizeof(struct compat_ipt_entry
);
1426 *size
-= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1428 xt_ematch_foreach(ematch
, e
) {
1429 ret
= xt_compat_match_to_user(ematch
, dstptr
, size
);
1433 target_offset
= e
->target_offset
- (origsize
- *size
);
1434 t
= ipt_get_target(e
);
1435 ret
= xt_compat_target_to_user(t
, dstptr
, size
);
1438 next_offset
= e
->next_offset
- (origsize
- *size
);
1439 if (put_user(target_offset
, &ce
->target_offset
) != 0 ||
1440 put_user(next_offset
, &ce
->next_offset
) != 0)
1446 compat_find_calc_match(struct xt_entry_match
*m
,
1448 const struct ipt_ip
*ip
,
1451 struct xt_match
*match
;
1453 match
= xt_request_find_match(NFPROTO_IPV4
, m
->u
.user
.name
,
1454 m
->u
.user
.revision
);
1455 if (IS_ERR(match
)) {
1456 duprintf("compat_check_calc_match: `%s' not found\n",
1458 return PTR_ERR(match
);
1460 m
->u
.kernel
.match
= match
;
1461 *size
+= xt_compat_match_offset(match
);
1465 static void compat_release_entry(struct compat_ipt_entry
*e
)
1467 struct xt_entry_target
*t
;
1468 struct xt_entry_match
*ematch
;
1470 /* Cleanup all matches */
1471 xt_ematch_foreach(ematch
, e
)
1472 module_put(ematch
->u
.kernel
.match
->me
);
1473 t
= compat_ipt_get_target(e
);
1474 module_put(t
->u
.kernel
.target
->me
);
1478 check_compat_entry_size_and_hooks(struct compat_ipt_entry
*e
,
1479 struct xt_table_info
*newinfo
,
1481 const unsigned char *base
,
1482 const unsigned char *limit
,
1483 const unsigned int *hook_entries
,
1484 const unsigned int *underflows
,
1487 struct xt_entry_match
*ematch
;
1488 struct xt_entry_target
*t
;
1489 struct xt_target
*target
;
1490 unsigned int entry_offset
;
1494 duprintf("check_compat_entry_size_and_hooks %p\n", e
);
1495 if ((unsigned long)e
% __alignof__(struct compat_ipt_entry
) != 0 ||
1496 (unsigned char *)e
+ sizeof(struct compat_ipt_entry
) >= limit
||
1497 (unsigned char *)e
+ e
->next_offset
> limit
) {
1498 duprintf("Bad offset %p, limit = %p\n", e
, limit
);
1502 if (e
->next_offset
< sizeof(struct compat_ipt_entry
) +
1503 sizeof(struct compat_xt_entry_target
)) {
1504 duprintf("checking: element %p size %u\n",
1509 /* For purposes of check_entry casting the compat entry is fine */
1510 ret
= check_entry((struct ipt_entry
*)e
);
1514 off
= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1515 entry_offset
= (void *)e
- (void *)base
;
1517 xt_ematch_foreach(ematch
, e
) {
1518 ret
= compat_find_calc_match(ematch
, name
, &e
->ip
, &off
);
1520 goto release_matches
;
1524 t
= compat_ipt_get_target(e
);
1525 target
= xt_request_find_target(NFPROTO_IPV4
, t
->u
.user
.name
,
1526 t
->u
.user
.revision
);
1527 if (IS_ERR(target
)) {
1528 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1530 ret
= PTR_ERR(target
);
1531 goto release_matches
;
1533 t
->u
.kernel
.target
= target
;
1535 off
+= xt_compat_target_offset(target
);
1537 ret
= xt_compat_add_offset(AF_INET
, entry_offset
, off
);
1541 /* Check hooks & underflows */
1542 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
1543 if ((unsigned char *)e
- base
== hook_entries
[h
])
1544 newinfo
->hook_entry
[h
] = hook_entries
[h
];
1545 if ((unsigned char *)e
- base
== underflows
[h
])
1546 newinfo
->underflow
[h
] = underflows
[h
];
1549 /* Clear counters and comefrom */
1550 memset(&e
->counters
, 0, sizeof(e
->counters
));
1555 module_put(t
->u
.kernel
.target
->me
);
1557 xt_ematch_foreach(ematch
, e
) {
1560 module_put(ematch
->u
.kernel
.match
->me
);
1566 compat_copy_entry_from_user(struct compat_ipt_entry
*e
, void **dstptr
,
1567 unsigned int *size
, const char *name
,
1568 struct xt_table_info
*newinfo
, unsigned char *base
)
1570 struct xt_entry_target
*t
;
1571 struct xt_target
*target
;
1572 struct ipt_entry
*de
;
1573 unsigned int origsize
;
1575 struct xt_entry_match
*ematch
;
1579 de
= (struct ipt_entry
*)*dstptr
;
1580 memcpy(de
, e
, sizeof(struct ipt_entry
));
1581 memcpy(&de
->counters
, &e
->counters
, sizeof(e
->counters
));
1583 *dstptr
+= sizeof(struct ipt_entry
);
1584 *size
+= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1586 xt_ematch_foreach(ematch
, e
) {
1587 ret
= xt_compat_match_from_user(ematch
, dstptr
, size
);
1591 de
->target_offset
= e
->target_offset
- (origsize
- *size
);
1592 t
= compat_ipt_get_target(e
);
1593 target
= t
->u
.kernel
.target
;
1594 xt_compat_target_from_user(t
, dstptr
, size
);
1596 de
->next_offset
= e
->next_offset
- (origsize
- *size
);
1597 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
1598 if ((unsigned char *)de
- base
< newinfo
->hook_entry
[h
])
1599 newinfo
->hook_entry
[h
] -= origsize
- *size
;
1600 if ((unsigned char *)de
- base
< newinfo
->underflow
[h
])
1601 newinfo
->underflow
[h
] -= origsize
- *size
;
1607 compat_check_entry(struct ipt_entry
*e
, struct net
*net
, const char *name
)
1609 struct xt_entry_match
*ematch
;
1610 struct xt_mtchk_param mtpar
;
1614 e
->counters
.pcnt
= xt_percpu_counter_alloc();
1615 if (IS_ERR_VALUE(e
->counters
.pcnt
))
1621 mtpar
.entryinfo
= &e
->ip
;
1622 mtpar
.hook_mask
= e
->comefrom
;
1623 mtpar
.family
= NFPROTO_IPV4
;
1624 xt_ematch_foreach(ematch
, e
) {
1625 ret
= check_match(ematch
, &mtpar
);
1627 goto cleanup_matches
;
1631 ret
= check_target(e
, net
, name
);
1633 goto cleanup_matches
;
1637 xt_ematch_foreach(ematch
, e
) {
1640 cleanup_match(ematch
, net
);
1643 xt_percpu_counter_free(e
->counters
.pcnt
);
1649 translate_compat_table(struct net
*net
,
1651 unsigned int valid_hooks
,
1652 struct xt_table_info
**pinfo
,
1654 unsigned int total_size
,
1655 unsigned int number
,
1656 unsigned int *hook_entries
,
1657 unsigned int *underflows
)
1660 struct xt_table_info
*newinfo
, *info
;
1661 void *pos
, *entry0
, *entry1
;
1662 struct compat_ipt_entry
*iter0
;
1663 struct ipt_entry
*iter1
;
1670 info
->number
= number
;
1672 /* Init all hooks to impossible value. */
1673 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1674 info
->hook_entry
[i
] = 0xFFFFFFFF;
1675 info
->underflow
[i
] = 0xFFFFFFFF;
1678 duprintf("translate_compat_table: size %u\n", info
->size
);
1680 xt_compat_lock(AF_INET
);
1681 xt_compat_init_offsets(AF_INET
, number
);
1682 /* Walk through entries, checking offsets. */
1683 xt_entry_foreach(iter0
, entry0
, total_size
) {
1684 ret
= check_compat_entry_size_and_hooks(iter0
, info
, &size
,
1686 entry0
+ total_size
,
1697 duprintf("translate_compat_table: %u not %u entries\n",
1702 /* Check hooks all assigned */
1703 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1704 /* Only hooks which are valid */
1705 if (!(valid_hooks
& (1 << i
)))
1707 if (info
->hook_entry
[i
] == 0xFFFFFFFF) {
1708 duprintf("Invalid hook entry %u %u\n",
1709 i
, hook_entries
[i
]);
1712 if (info
->underflow
[i
] == 0xFFFFFFFF) {
1713 duprintf("Invalid underflow %u %u\n",
1720 newinfo
= xt_alloc_table_info(size
);
1724 newinfo
->number
= number
;
1725 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1726 newinfo
->hook_entry
[i
] = info
->hook_entry
[i
];
1727 newinfo
->underflow
[i
] = info
->underflow
[i
];
1729 entry1
= newinfo
->entries
;
1732 xt_entry_foreach(iter0
, entry0
, total_size
) {
1733 ret
= compat_copy_entry_from_user(iter0
, &pos
, &size
,
1734 name
, newinfo
, entry1
);
1738 xt_compat_flush_offsets(AF_INET
);
1739 xt_compat_unlock(AF_INET
);
1744 if (!mark_source_chains(newinfo
, valid_hooks
, entry1
))
1748 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1749 ret
= compat_check_entry(iter1
, net
, name
);
1753 if (strcmp(ipt_get_target(iter1
)->u
.user
.name
,
1754 XT_ERROR_TARGET
) == 0)
1755 ++newinfo
->stacksize
;
1759 * The first i matches need cleanup_entry (calls ->destroy)
1760 * because they had called ->check already. The other j-i
1761 * entries need only release.
1765 xt_entry_foreach(iter0
, entry0
, newinfo
->size
) {
1770 compat_release_entry(iter0
);
1772 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1775 cleanup_entry(iter1
, net
);
1777 xt_free_table_info(newinfo
);
1783 xt_free_table_info(info
);
1787 xt_free_table_info(newinfo
);
1789 xt_entry_foreach(iter0
, entry0
, total_size
) {
1792 compat_release_entry(iter0
);
1796 xt_compat_flush_offsets(AF_INET
);
1797 xt_compat_unlock(AF_INET
);
1802 compat_do_replace(struct net
*net
, void __user
*user
, unsigned int len
)
1805 struct compat_ipt_replace tmp
;
1806 struct xt_table_info
*newinfo
;
1807 void *loc_cpu_entry
;
1808 struct ipt_entry
*iter
;
1810 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1813 /* overflow check */
1814 if (tmp
.size
>= INT_MAX
/ num_possible_cpus())
1816 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1818 if (tmp
.num_counters
== 0)
1821 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1823 newinfo
= xt_alloc_table_info(tmp
.size
);
1827 loc_cpu_entry
= newinfo
->entries
;
1828 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1834 ret
= translate_compat_table(net
, tmp
.name
, tmp
.valid_hooks
,
1835 &newinfo
, &loc_cpu_entry
, tmp
.size
,
1836 tmp
.num_entries
, tmp
.hook_entry
,
1841 duprintf("compat_do_replace: Translated table\n");
1843 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1844 tmp
.num_counters
, compat_ptr(tmp
.counters
));
1846 goto free_newinfo_untrans
;
1849 free_newinfo_untrans
:
1850 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1851 cleanup_entry(iter
, net
);
1853 xt_free_table_info(newinfo
);
1858 compat_do_ipt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1863 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1867 case IPT_SO_SET_REPLACE
:
1868 ret
= compat_do_replace(sock_net(sk
), user
, len
);
1871 case IPT_SO_SET_ADD_COUNTERS
:
1872 ret
= do_add_counters(sock_net(sk
), user
, len
, 1);
1876 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd
);
1883 struct compat_ipt_get_entries
{
1884 char name
[XT_TABLE_MAXNAMELEN
];
1886 struct compat_ipt_entry entrytable
[0];
1890 compat_copy_entries_to_user(unsigned int total_size
, struct xt_table
*table
,
1891 void __user
*userptr
)
1893 struct xt_counters
*counters
;
1894 const struct xt_table_info
*private = table
->private;
1899 struct ipt_entry
*iter
;
1901 counters
= alloc_counters(table
);
1902 if (IS_ERR(counters
))
1903 return PTR_ERR(counters
);
1907 xt_entry_foreach(iter
, private->entries
, total_size
) {
1908 ret
= compat_copy_entry_to_user(iter
, &pos
,
1909 &size
, counters
, i
++);
1919 compat_get_entries(struct net
*net
, struct compat_ipt_get_entries __user
*uptr
,
1923 struct compat_ipt_get_entries get
;
1926 if (*len
< sizeof(get
)) {
1927 duprintf("compat_get_entries: %u < %zu\n", *len
, sizeof(get
));
1931 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1934 if (*len
!= sizeof(struct compat_ipt_get_entries
) + get
.size
) {
1935 duprintf("compat_get_entries: %u != %zu\n",
1936 *len
, sizeof(get
) + get
.size
);
1939 get
.name
[sizeof(get
.name
) - 1] = '\0';
1941 xt_compat_lock(AF_INET
);
1942 t
= xt_find_table_lock(net
, AF_INET
, get
.name
);
1943 if (!IS_ERR_OR_NULL(t
)) {
1944 const struct xt_table_info
*private = t
->private;
1945 struct xt_table_info info
;
1946 duprintf("t->private->number = %u\n", private->number
);
1947 ret
= compat_table_info(private, &info
);
1948 if (!ret
&& get
.size
== info
.size
) {
1949 ret
= compat_copy_entries_to_user(private->size
,
1950 t
, uptr
->entrytable
);
1952 duprintf("compat_get_entries: I've got %u not %u!\n",
1953 private->size
, get
.size
);
1956 xt_compat_flush_offsets(AF_INET
);
1960 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1962 xt_compat_unlock(AF_INET
);
1966 static int do_ipt_get_ctl(struct sock
*, int, void __user
*, int *);
1969 compat_do_ipt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
1973 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1977 case IPT_SO_GET_INFO
:
1978 ret
= get_info(sock_net(sk
), user
, len
, 1);
1980 case IPT_SO_GET_ENTRIES
:
1981 ret
= compat_get_entries(sock_net(sk
), user
, len
);
1984 ret
= do_ipt_get_ctl(sk
, cmd
, user
, len
);
1991 do_ipt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
, unsigned int len
)
1995 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1999 case IPT_SO_SET_REPLACE
:
2000 ret
= do_replace(sock_net(sk
), user
, len
);
2003 case IPT_SO_SET_ADD_COUNTERS
:
2004 ret
= do_add_counters(sock_net(sk
), user
, len
, 0);
2008 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd
);
2016 do_ipt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
2020 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
2024 case IPT_SO_GET_INFO
:
2025 ret
= get_info(sock_net(sk
), user
, len
, 0);
2028 case IPT_SO_GET_ENTRIES
:
2029 ret
= get_entries(sock_net(sk
), user
, len
);
2032 case IPT_SO_GET_REVISION_MATCH
:
2033 case IPT_SO_GET_REVISION_TARGET
: {
2034 struct xt_get_revision rev
;
2037 if (*len
!= sizeof(rev
)) {
2041 if (copy_from_user(&rev
, user
, sizeof(rev
)) != 0) {
2045 rev
.name
[sizeof(rev
.name
)-1] = 0;
2047 if (cmd
== IPT_SO_GET_REVISION_TARGET
)
2052 try_then_request_module(xt_find_revision(AF_INET
, rev
.name
,
2055 "ipt_%s", rev
.name
);
2060 duprintf("do_ipt_get_ctl: unknown request %i\n", cmd
);
2067 static void __ipt_unregister_table(struct net
*net
, struct xt_table
*table
)
2069 struct xt_table_info
*private;
2070 void *loc_cpu_entry
;
2071 struct module
*table_owner
= table
->me
;
2072 struct ipt_entry
*iter
;
2074 private = xt_unregister_table(table
);
2076 /* Decrease module usage counts and free resources */
2077 loc_cpu_entry
= private->entries
;
2078 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
)
2079 cleanup_entry(iter
, net
);
2080 if (private->number
> private->initial_entries
)
2081 module_put(table_owner
);
2082 xt_free_table_info(private);
2085 int ipt_register_table(struct net
*net
, const struct xt_table
*table
,
2086 const struct ipt_replace
*repl
,
2087 const struct nf_hook_ops
*ops
, struct xt_table
**res
)
2090 struct xt_table_info
*newinfo
;
2091 struct xt_table_info bootstrap
= {0};
2092 void *loc_cpu_entry
;
2093 struct xt_table
*new_table
;
2095 newinfo
= xt_alloc_table_info(repl
->size
);
2099 loc_cpu_entry
= newinfo
->entries
;
2100 memcpy(loc_cpu_entry
, repl
->entries
, repl
->size
);
2102 ret
= translate_table(net
, newinfo
, loc_cpu_entry
, repl
);
2106 new_table
= xt_register_table(net
, table
, &bootstrap
, newinfo
);
2107 if (IS_ERR(new_table
)) {
2108 ret
= PTR_ERR(new_table
);
2112 /* set res now, will see skbs right after nf_register_net_hooks */
2113 WRITE_ONCE(*res
, new_table
);
2115 ret
= nf_register_net_hooks(net
, ops
, hweight32(table
->valid_hooks
));
2117 __ipt_unregister_table(net
, new_table
);
2124 xt_free_table_info(newinfo
);
2128 void ipt_unregister_table(struct net
*net
, struct xt_table
*table
,
2129 const struct nf_hook_ops
*ops
)
2131 nf_unregister_net_hooks(net
, ops
, hweight32(table
->valid_hooks
));
2132 __ipt_unregister_table(net
, table
);
2135 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2137 icmp_type_code_match(u_int8_t test_type
, u_int8_t min_code
, u_int8_t max_code
,
2138 u_int8_t type
, u_int8_t code
,
2141 return ((test_type
== 0xFF) ||
2142 (type
== test_type
&& code
>= min_code
&& code
<= max_code
))
2147 icmp_match(const struct sk_buff
*skb
, struct xt_action_param
*par
)
2149 const struct icmphdr
*ic
;
2150 struct icmphdr _icmph
;
2151 const struct ipt_icmp
*icmpinfo
= par
->matchinfo
;
2153 /* Must not be a fragment. */
2154 if (par
->fragoff
!= 0)
2157 ic
= skb_header_pointer(skb
, par
->thoff
, sizeof(_icmph
), &_icmph
);
2159 /* We've been asked to examine this packet, and we
2160 * can't. Hence, no choice but to drop.
2162 duprintf("Dropping evil ICMP tinygram.\n");
2163 par
->hotdrop
= true;
2167 return icmp_type_code_match(icmpinfo
->type
,
2171 !!(icmpinfo
->invflags
&IPT_ICMP_INV
));
2174 static int icmp_checkentry(const struct xt_mtchk_param
*par
)
2176 const struct ipt_icmp
*icmpinfo
= par
->matchinfo
;
2178 /* Must specify no unknown invflags */
2179 return (icmpinfo
->invflags
& ~IPT_ICMP_INV
) ? -EINVAL
: 0;
2182 static struct xt_target ipt_builtin_tg
[] __read_mostly
= {
2184 .name
= XT_STANDARD_TARGET
,
2185 .targetsize
= sizeof(int),
2186 .family
= NFPROTO_IPV4
,
2187 #ifdef CONFIG_COMPAT
2188 .compatsize
= sizeof(compat_int_t
),
2189 .compat_from_user
= compat_standard_from_user
,
2190 .compat_to_user
= compat_standard_to_user
,
2194 .name
= XT_ERROR_TARGET
,
2195 .target
= ipt_error
,
2196 .targetsize
= XT_FUNCTION_MAXNAMELEN
,
2197 .family
= NFPROTO_IPV4
,
2201 static struct nf_sockopt_ops ipt_sockopts
= {
2203 .set_optmin
= IPT_BASE_CTL
,
2204 .set_optmax
= IPT_SO_SET_MAX
+1,
2205 .set
= do_ipt_set_ctl
,
2206 #ifdef CONFIG_COMPAT
2207 .compat_set
= compat_do_ipt_set_ctl
,
2209 .get_optmin
= IPT_BASE_CTL
,
2210 .get_optmax
= IPT_SO_GET_MAX
+1,
2211 .get
= do_ipt_get_ctl
,
2212 #ifdef CONFIG_COMPAT
2213 .compat_get
= compat_do_ipt_get_ctl
,
2215 .owner
= THIS_MODULE
,
2218 static struct xt_match ipt_builtin_mt
[] __read_mostly
= {
2221 .match
= icmp_match
,
2222 .matchsize
= sizeof(struct ipt_icmp
),
2223 .checkentry
= icmp_checkentry
,
2224 .proto
= IPPROTO_ICMP
,
2225 .family
= NFPROTO_IPV4
,
2229 static int __net_init
ip_tables_net_init(struct net
*net
)
2231 return xt_proto_init(net
, NFPROTO_IPV4
);
2234 static void __net_exit
ip_tables_net_exit(struct net
*net
)
2236 xt_proto_fini(net
, NFPROTO_IPV4
);
2239 static struct pernet_operations ip_tables_net_ops
= {
2240 .init
= ip_tables_net_init
,
2241 .exit
= ip_tables_net_exit
,
2244 static int __init
ip_tables_init(void)
2248 ret
= register_pernet_subsys(&ip_tables_net_ops
);
2252 /* No one else will be downing sem now, so we won't sleep */
2253 ret
= xt_register_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2256 ret
= xt_register_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2260 /* Register setsockopt */
2261 ret
= nf_register_sockopt(&ipt_sockopts
);
2265 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2269 xt_unregister_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2271 xt_unregister_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2273 unregister_pernet_subsys(&ip_tables_net_ops
);
2278 static void __exit
ip_tables_fini(void)
2280 nf_unregister_sockopt(&ipt_sockopts
);
2282 xt_unregister_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2283 xt_unregister_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2284 unregister_pernet_subsys(&ip_tables_net_ops
);
2287 EXPORT_SYMBOL(ipt_register_table
);
2288 EXPORT_SYMBOL(ipt_unregister_table
);
2289 EXPORT_SYMBOL(ipt_do_table
);
2290 module_init(ip_tables_init
);
2291 module_exit(ip_tables_fini
);