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_ip
*ip
)
173 static const struct ipt_ip uncond
;
175 return memcmp(ip
, &uncond
, sizeof(uncond
)) == 0;
179 /* for const-correctness */
180 static inline const struct xt_entry_target
*
181 ipt_get_target_c(const struct ipt_entry
*e
)
183 return ipt_get_target((struct ipt_entry
*)e
);
186 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
187 static const char *const hooknames
[] = {
188 [NF_INET_PRE_ROUTING
] = "PREROUTING",
189 [NF_INET_LOCAL_IN
] = "INPUT",
190 [NF_INET_FORWARD
] = "FORWARD",
191 [NF_INET_LOCAL_OUT
] = "OUTPUT",
192 [NF_INET_POST_ROUTING
] = "POSTROUTING",
195 enum nf_ip_trace_comments
{
196 NF_IP_TRACE_COMMENT_RULE
,
197 NF_IP_TRACE_COMMENT_RETURN
,
198 NF_IP_TRACE_COMMENT_POLICY
,
201 static const char *const comments
[] = {
202 [NF_IP_TRACE_COMMENT_RULE
] = "rule",
203 [NF_IP_TRACE_COMMENT_RETURN
] = "return",
204 [NF_IP_TRACE_COMMENT_POLICY
] = "policy",
207 static struct nf_loginfo trace_loginfo
= {
208 .type
= NF_LOG_TYPE_LOG
,
212 .logflags
= NF_LOG_MASK
,
217 /* Mildly perf critical (only if packet tracing is on) */
219 get_chainname_rulenum(const struct ipt_entry
*s
, const struct ipt_entry
*e
,
220 const char *hookname
, const char **chainname
,
221 const char **comment
, unsigned int *rulenum
)
223 const struct xt_standard_target
*t
= (void *)ipt_get_target_c(s
);
225 if (strcmp(t
->target
.u
.kernel
.target
->name
, XT_ERROR_TARGET
) == 0) {
226 /* Head of user chain: ERROR target with chainname */
227 *chainname
= t
->target
.data
;
232 if (s
->target_offset
== sizeof(struct ipt_entry
) &&
233 strcmp(t
->target
.u
.kernel
.target
->name
,
234 XT_STANDARD_TARGET
) == 0 &&
236 unconditional(&s
->ip
)) {
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(const struct sk_buff
*skb
,
251 const struct net_device
*in
,
252 const struct net_device
*out
,
253 const char *tablename
,
254 const struct xt_table_info
*private,
255 const struct ipt_entry
*e
)
257 const void *table_base
;
258 const struct ipt_entry
*root
;
259 const char *hookname
, *chainname
, *comment
;
260 const struct ipt_entry
*iter
;
261 unsigned int rulenum
= 0;
262 struct net
*net
= dev_net(in
? in
: out
);
264 table_base
= private->entries
[smp_processor_id()];
265 root
= get_entry(table_base
, private->hook_entry
[hook
]);
267 hookname
= chainname
= hooknames
[hook
];
268 comment
= comments
[NF_IP_TRACE_COMMENT_RULE
];
270 xt_entry_foreach(iter
, root
, private->size
- private->hook_entry
[hook
])
271 if (get_chainname_rulenum(iter
, e
, hookname
,
272 &chainname
, &comment
, &rulenum
) != 0)
275 nf_log_trace(net
, AF_INET
, hook
, skb
, in
, out
, &trace_loginfo
,
276 "TRACE: %s:%s:%s:%u ",
277 tablename
, chainname
, comment
, rulenum
);
282 struct ipt_entry
*ipt_next_entry(const struct ipt_entry
*entry
)
284 return (void *)entry
+ entry
->next_offset
;
287 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
289 ipt_do_table(struct sk_buff
*skb
,
291 const struct nf_hook_state
*state
,
292 struct xt_table
*table
)
294 static const char nulldevname
[IFNAMSIZ
] __attribute__((aligned(sizeof(long))));
295 const struct iphdr
*ip
;
296 /* Initializing verdict to NF_DROP keeps gcc happy. */
297 unsigned int verdict
= NF_DROP
;
298 const char *indev
, *outdev
;
299 const void *table_base
;
300 struct ipt_entry
*e
, **jumpstack
;
301 unsigned int *stackptr
, origptr
, cpu
;
302 const struct xt_table_info
*private;
303 struct xt_action_param acpar
;
308 indev
= state
->in
? state
->in
->name
: nulldevname
;
309 outdev
= state
->out
? state
->out
->name
: nulldevname
;
310 /* We handle fragments by dealing with the first fragment as
311 * if it was a normal packet. All other fragments are treated
312 * normally, except that they will NEVER match rules that ask
313 * things we don't know, ie. tcp syn flag or ports). If the
314 * rule is also a fragment-specific rule, non-fragments won't
316 acpar
.fragoff
= ntohs(ip
->frag_off
) & IP_OFFSET
;
317 acpar
.thoff
= ip_hdrlen(skb
);
318 acpar
.hotdrop
= false;
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
[cpu
];
335 jumpstack
= (struct ipt_entry
**)private->jumpstack
[cpu
];
336 stackptr
= per_cpu_ptr(private->stackptr
, cpu
);
339 e
= get_entry(table_base
, private->hook_entry
[hook
]);
341 pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
342 table
->name
, hook
, origptr
,
343 get_entry(table_base
, private->underflow
[hook
]));
346 const struct xt_entry_target
*t
;
347 const struct xt_entry_match
*ematch
;
350 if (!ip_packet_match(ip
, indev
, outdev
,
351 &e
->ip
, acpar
.fragoff
)) {
353 e
= ipt_next_entry(e
);
357 xt_ematch_foreach(ematch
, e
) {
358 acpar
.match
= ematch
->u
.kernel
.match
;
359 acpar
.matchinfo
= ematch
->data
;
360 if (!acpar
.match
->match(skb
, &acpar
))
364 ADD_COUNTER(e
->counters
, skb
->len
, 1);
366 t
= ipt_get_target(e
);
367 IP_NF_ASSERT(t
->u
.kernel
.target
);
369 #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
370 /* The packet is traced: log it */
371 if (unlikely(skb
->nf_trace
))
372 trace_packet(skb
, hook
, state
->in
, state
->out
,
373 table
->name
, private, e
);
375 /* Standard target? */
376 if (!t
->u
.kernel
.target
->target
) {
379 v
= ((struct xt_standard_target
*)t
)->verdict
;
381 /* Pop from stack? */
382 if (v
!= XT_RETURN
) {
383 verdict
= (unsigned int)(-v
) - 1;
386 if (*stackptr
<= origptr
) {
387 e
= get_entry(table_base
,
388 private->underflow
[hook
]);
389 pr_debug("Underflow (this is normal) "
392 e
= jumpstack
[--*stackptr
];
393 pr_debug("Pulled %p out from pos %u\n",
395 e
= ipt_next_entry(e
);
399 if (table_base
+ v
!= ipt_next_entry(e
) &&
400 !(e
->ip
.flags
& IPT_F_GOTO
)) {
401 if (*stackptr
>= private->stacksize
) {
405 jumpstack
[(*stackptr
)++] = e
;
406 pr_debug("Pushed %p into pos %u\n",
410 e
= get_entry(table_base
, v
);
414 acpar
.target
= t
->u
.kernel
.target
;
415 acpar
.targinfo
= t
->data
;
417 verdict
= t
->u
.kernel
.target
->target(skb
, &acpar
);
418 /* Target might have changed stuff. */
420 if (verdict
== XT_CONTINUE
)
421 e
= ipt_next_entry(e
);
425 } while (!acpar
.hotdrop
);
426 pr_debug("Exiting %s; resetting sp from %u to %u\n",
427 __func__
, *stackptr
, origptr
);
429 xt_write_recseq_end(addend
);
432 #ifdef DEBUG_ALLOW_ALL
441 /* Figures out from what hook each rule can be called: returns 0 if
442 there are loops. Puts hook bitmask in comefrom. */
444 mark_source_chains(const struct xt_table_info
*newinfo
,
445 unsigned int valid_hooks
, void *entry0
)
449 /* No recursion; use packet counter to save back ptrs (reset
450 to 0 as we leave), and comefrom to save source hook bitmask */
451 for (hook
= 0; hook
< NF_INET_NUMHOOKS
; hook
++) {
452 unsigned int pos
= newinfo
->hook_entry
[hook
];
453 struct ipt_entry
*e
= (struct ipt_entry
*)(entry0
+ pos
);
455 if (!(valid_hooks
& (1 << hook
)))
458 /* Set initial back pointer. */
459 e
->counters
.pcnt
= pos
;
462 const struct xt_standard_target
*t
463 = (void *)ipt_get_target_c(e
);
464 int visited
= e
->comefrom
& (1 << hook
);
466 if (e
->comefrom
& (1 << NF_INET_NUMHOOKS
)) {
467 pr_err("iptables: loop hook %u pos %u %08X.\n",
468 hook
, pos
, e
->comefrom
);
471 e
->comefrom
|= ((1 << hook
) | (1 << NF_INET_NUMHOOKS
));
473 /* Unconditional return/END. */
474 if ((e
->target_offset
== sizeof(struct ipt_entry
) &&
475 (strcmp(t
->target
.u
.user
.name
,
476 XT_STANDARD_TARGET
) == 0) &&
477 t
->verdict
< 0 && unconditional(&e
->ip
)) ||
479 unsigned int oldpos
, size
;
481 if ((strcmp(t
->target
.u
.user
.name
,
482 XT_STANDARD_TARGET
) == 0) &&
483 t
->verdict
< -NF_MAX_VERDICT
- 1) {
484 duprintf("mark_source_chains: bad "
485 "negative verdict (%i)\n",
490 /* Return: backtrack through the last
493 e
->comefrom
^= (1<<NF_INET_NUMHOOKS
);
494 #ifdef DEBUG_IP_FIREWALL_USER
496 & (1 << NF_INET_NUMHOOKS
)) {
497 duprintf("Back unset "
504 pos
= e
->counters
.pcnt
;
505 e
->counters
.pcnt
= 0;
507 /* We're at the start. */
511 e
= (struct ipt_entry
*)
513 } while (oldpos
== pos
+ e
->next_offset
);
516 size
= e
->next_offset
;
517 e
= (struct ipt_entry
*)
518 (entry0
+ pos
+ size
);
519 e
->counters
.pcnt
= pos
;
522 int newpos
= t
->verdict
;
524 if (strcmp(t
->target
.u
.user
.name
,
525 XT_STANDARD_TARGET
) == 0 &&
527 if (newpos
> newinfo
->size
-
528 sizeof(struct ipt_entry
)) {
529 duprintf("mark_source_chains: "
530 "bad verdict (%i)\n",
534 /* This a jump; chase it. */
535 duprintf("Jump rule %u -> %u\n",
538 /* ... this is a fallthru */
539 newpos
= pos
+ e
->next_offset
;
541 e
= (struct ipt_entry
*)
543 e
->counters
.pcnt
= pos
;
548 duprintf("Finished chain %u\n", hook
);
553 static void cleanup_match(struct xt_entry_match
*m
, struct net
*net
)
555 struct xt_mtdtor_param par
;
558 par
.match
= m
->u
.kernel
.match
;
559 par
.matchinfo
= m
->data
;
560 par
.family
= NFPROTO_IPV4
;
561 if (par
.match
->destroy
!= NULL
)
562 par
.match
->destroy(&par
);
563 module_put(par
.match
->me
);
567 check_entry(const struct ipt_entry
*e
, const char *name
)
569 const struct xt_entry_target
*t
;
571 if (!ip_checkentry(&e
->ip
)) {
572 duprintf("ip check failed %p %s.\n", e
, name
);
576 if (e
->target_offset
+ sizeof(struct xt_entry_target
) >
580 t
= ipt_get_target_c(e
);
581 if (e
->target_offset
+ t
->u
.target_size
> e
->next_offset
)
588 check_match(struct xt_entry_match
*m
, struct xt_mtchk_param
*par
)
590 const struct ipt_ip
*ip
= par
->entryinfo
;
593 par
->match
= m
->u
.kernel
.match
;
594 par
->matchinfo
= m
->data
;
596 ret
= xt_check_match(par
, m
->u
.match_size
- sizeof(*m
),
597 ip
->proto
, ip
->invflags
& IPT_INV_PROTO
);
599 duprintf("check failed for `%s'.\n", par
->match
->name
);
606 find_check_match(struct xt_entry_match
*m
, struct xt_mtchk_param
*par
)
608 struct xt_match
*match
;
611 match
= xt_request_find_match(NFPROTO_IPV4
, m
->u
.user
.name
,
614 duprintf("find_check_match: `%s' not found\n", m
->u
.user
.name
);
615 return PTR_ERR(match
);
617 m
->u
.kernel
.match
= match
;
619 ret
= check_match(m
, par
);
625 module_put(m
->u
.kernel
.match
->me
);
629 static int check_target(struct ipt_entry
*e
, struct net
*net
, const char *name
)
631 struct xt_entry_target
*t
= ipt_get_target(e
);
632 struct xt_tgchk_param par
= {
636 .target
= t
->u
.kernel
.target
,
638 .hook_mask
= e
->comefrom
,
639 .family
= NFPROTO_IPV4
,
643 ret
= xt_check_target(&par
, t
->u
.target_size
- sizeof(*t
),
644 e
->ip
.proto
, e
->ip
.invflags
& IPT_INV_PROTO
);
646 duprintf("check failed for `%s'.\n",
647 t
->u
.kernel
.target
->name
);
654 find_check_entry(struct ipt_entry
*e
, struct net
*net
, const char *name
,
657 struct xt_entry_target
*t
;
658 struct xt_target
*target
;
661 struct xt_mtchk_param mtpar
;
662 struct xt_entry_match
*ematch
;
664 ret
= check_entry(e
, name
);
671 mtpar
.entryinfo
= &e
->ip
;
672 mtpar
.hook_mask
= e
->comefrom
;
673 mtpar
.family
= NFPROTO_IPV4
;
674 xt_ematch_foreach(ematch
, e
) {
675 ret
= find_check_match(ematch
, &mtpar
);
677 goto cleanup_matches
;
681 t
= ipt_get_target(e
);
682 target
= xt_request_find_target(NFPROTO_IPV4
, t
->u
.user
.name
,
684 if (IS_ERR(target
)) {
685 duprintf("find_check_entry: `%s' not found\n", t
->u
.user
.name
);
686 ret
= PTR_ERR(target
);
687 goto cleanup_matches
;
689 t
->u
.kernel
.target
= target
;
691 ret
= check_target(e
, net
, name
);
696 module_put(t
->u
.kernel
.target
->me
);
698 xt_ematch_foreach(ematch
, e
) {
701 cleanup_match(ematch
, net
);
706 static bool check_underflow(const struct ipt_entry
*e
)
708 const struct xt_entry_target
*t
;
709 unsigned int verdict
;
711 if (!unconditional(&e
->ip
))
713 t
= ipt_get_target_c(e
);
714 if (strcmp(t
->u
.user
.name
, XT_STANDARD_TARGET
) != 0)
716 verdict
= ((struct xt_standard_target
*)t
)->verdict
;
717 verdict
= -verdict
- 1;
718 return verdict
== NF_DROP
|| verdict
== NF_ACCEPT
;
722 check_entry_size_and_hooks(struct ipt_entry
*e
,
723 struct xt_table_info
*newinfo
,
724 const unsigned char *base
,
725 const unsigned char *limit
,
726 const unsigned int *hook_entries
,
727 const unsigned int *underflows
,
728 unsigned int valid_hooks
)
732 if ((unsigned long)e
% __alignof__(struct ipt_entry
) != 0 ||
733 (unsigned char *)e
+ sizeof(struct ipt_entry
) >= limit
) {
734 duprintf("Bad offset %p\n", e
);
739 < sizeof(struct ipt_entry
) + sizeof(struct xt_entry_target
)) {
740 duprintf("checking: element %p size %u\n",
745 /* Check hooks & underflows */
746 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
747 if (!(valid_hooks
& (1 << h
)))
749 if ((unsigned char *)e
- base
== hook_entries
[h
])
750 newinfo
->hook_entry
[h
] = hook_entries
[h
];
751 if ((unsigned char *)e
- base
== underflows
[h
]) {
752 if (!check_underflow(e
)) {
753 pr_err("Underflows must be unconditional and "
754 "use the STANDARD target with "
758 newinfo
->underflow
[h
] = underflows
[h
];
762 /* Clear counters and comefrom */
763 e
->counters
= ((struct xt_counters
) { 0, 0 });
769 cleanup_entry(struct ipt_entry
*e
, struct net
*net
)
771 struct xt_tgdtor_param par
;
772 struct xt_entry_target
*t
;
773 struct xt_entry_match
*ematch
;
775 /* Cleanup all matches */
776 xt_ematch_foreach(ematch
, e
)
777 cleanup_match(ematch
, net
);
778 t
= ipt_get_target(e
);
781 par
.target
= t
->u
.kernel
.target
;
782 par
.targinfo
= t
->data
;
783 par
.family
= NFPROTO_IPV4
;
784 if (par
.target
->destroy
!= NULL
)
785 par
.target
->destroy(&par
);
786 module_put(par
.target
->me
);
789 /* Checks and translates the user-supplied table segment (held in
792 translate_table(struct net
*net
, struct xt_table_info
*newinfo
, void *entry0
,
793 const struct ipt_replace
*repl
)
795 struct ipt_entry
*iter
;
799 newinfo
->size
= repl
->size
;
800 newinfo
->number
= repl
->num_entries
;
802 /* Init all hooks to impossible value. */
803 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
804 newinfo
->hook_entry
[i
] = 0xFFFFFFFF;
805 newinfo
->underflow
[i
] = 0xFFFFFFFF;
808 duprintf("translate_table: size %u\n", newinfo
->size
);
810 /* Walk through entries, checking offsets. */
811 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
812 ret
= check_entry_size_and_hooks(iter
, newinfo
, entry0
,
820 if (strcmp(ipt_get_target(iter
)->u
.user
.name
,
821 XT_ERROR_TARGET
) == 0)
822 ++newinfo
->stacksize
;
825 if (i
!= repl
->num_entries
) {
826 duprintf("translate_table: %u not %u entries\n",
827 i
, repl
->num_entries
);
831 /* Check hooks all assigned */
832 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
833 /* Only hooks which are valid */
834 if (!(repl
->valid_hooks
& (1 << i
)))
836 if (newinfo
->hook_entry
[i
] == 0xFFFFFFFF) {
837 duprintf("Invalid hook entry %u %u\n",
838 i
, repl
->hook_entry
[i
]);
841 if (newinfo
->underflow
[i
] == 0xFFFFFFFF) {
842 duprintf("Invalid underflow %u %u\n",
843 i
, repl
->underflow
[i
]);
848 if (!mark_source_chains(newinfo
, repl
->valid_hooks
, entry0
))
851 /* Finally, each sanity check must pass */
853 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
854 ret
= find_check_entry(iter
, net
, repl
->name
, repl
->size
);
861 xt_entry_foreach(iter
, entry0
, newinfo
->size
) {
864 cleanup_entry(iter
, net
);
869 /* And one copy for every other CPU */
870 for_each_possible_cpu(i
) {
871 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry0
)
872 memcpy(newinfo
->entries
[i
], entry0
, newinfo
->size
);
879 get_counters(const struct xt_table_info
*t
,
880 struct xt_counters counters
[])
882 struct ipt_entry
*iter
;
886 for_each_possible_cpu(cpu
) {
887 seqcount_t
*s
= &per_cpu(xt_recseq
, cpu
);
890 xt_entry_foreach(iter
, t
->entries
[cpu
], t
->size
) {
895 start
= read_seqcount_begin(s
);
896 bcnt
= iter
->counters
.bcnt
;
897 pcnt
= iter
->counters
.pcnt
;
898 } while (read_seqcount_retry(s
, start
));
900 ADD_COUNTER(counters
[i
], bcnt
, pcnt
);
901 ++i
; /* macro does multi eval of i */
906 static struct xt_counters
*alloc_counters(const struct xt_table
*table
)
908 unsigned int countersize
;
909 struct xt_counters
*counters
;
910 const struct xt_table_info
*private = table
->private;
912 /* We need atomic snapshot of counters: rest doesn't change
913 (other than comefrom, which userspace doesn't care
915 countersize
= sizeof(struct xt_counters
) * private->number
;
916 counters
= vzalloc(countersize
);
918 if (counters
== NULL
)
919 return ERR_PTR(-ENOMEM
);
921 get_counters(private, counters
);
927 copy_entries_to_user(unsigned int total_size
,
928 const struct xt_table
*table
,
929 void __user
*userptr
)
931 unsigned int off
, num
;
932 const struct ipt_entry
*e
;
933 struct xt_counters
*counters
;
934 const struct xt_table_info
*private = table
->private;
936 const void *loc_cpu_entry
;
938 counters
= alloc_counters(table
);
939 if (IS_ERR(counters
))
940 return PTR_ERR(counters
);
942 /* choose the copy that is on our node/cpu, ...
943 * This choice is lazy (because current thread is
944 * allowed to migrate to another cpu)
946 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
947 if (copy_to_user(userptr
, loc_cpu_entry
, total_size
) != 0) {
952 /* FIXME: use iterator macros --RR */
953 /* ... then go back and fix counters and names */
954 for (off
= 0, num
= 0; off
< total_size
; off
+= e
->next_offset
, num
++){
956 const struct xt_entry_match
*m
;
957 const struct xt_entry_target
*t
;
959 e
= (struct ipt_entry
*)(loc_cpu_entry
+ off
);
960 if (copy_to_user(userptr
+ off
961 + offsetof(struct ipt_entry
, counters
),
963 sizeof(counters
[num
])) != 0) {
968 for (i
= sizeof(struct ipt_entry
);
969 i
< e
->target_offset
;
970 i
+= m
->u
.match_size
) {
973 if (copy_to_user(userptr
+ off
+ i
974 + offsetof(struct xt_entry_match
,
976 m
->u
.kernel
.match
->name
,
977 strlen(m
->u
.kernel
.match
->name
)+1)
984 t
= ipt_get_target_c(e
);
985 if (copy_to_user(userptr
+ off
+ e
->target_offset
986 + offsetof(struct xt_entry_target
,
988 t
->u
.kernel
.target
->name
,
989 strlen(t
->u
.kernel
.target
->name
)+1) != 0) {
1000 #ifdef CONFIG_COMPAT
1001 static void compat_standard_from_user(void *dst
, const void *src
)
1003 int v
= *(compat_int_t
*)src
;
1006 v
+= xt_compat_calc_jump(AF_INET
, v
);
1007 memcpy(dst
, &v
, sizeof(v
));
1010 static int compat_standard_to_user(void __user
*dst
, const void *src
)
1012 compat_int_t cv
= *(int *)src
;
1015 cv
-= xt_compat_calc_jump(AF_INET
, cv
);
1016 return copy_to_user(dst
, &cv
, sizeof(cv
)) ? -EFAULT
: 0;
1019 static int compat_calc_entry(const struct ipt_entry
*e
,
1020 const struct xt_table_info
*info
,
1021 const void *base
, struct xt_table_info
*newinfo
)
1023 const struct xt_entry_match
*ematch
;
1024 const struct xt_entry_target
*t
;
1025 unsigned int entry_offset
;
1028 off
= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1029 entry_offset
= (void *)e
- base
;
1030 xt_ematch_foreach(ematch
, e
)
1031 off
+= xt_compat_match_offset(ematch
->u
.kernel
.match
);
1032 t
= ipt_get_target_c(e
);
1033 off
+= xt_compat_target_offset(t
->u
.kernel
.target
);
1034 newinfo
->size
-= off
;
1035 ret
= xt_compat_add_offset(AF_INET
, entry_offset
, off
);
1039 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1040 if (info
->hook_entry
[i
] &&
1041 (e
< (struct ipt_entry
*)(base
+ info
->hook_entry
[i
])))
1042 newinfo
->hook_entry
[i
] -= off
;
1043 if (info
->underflow
[i
] &&
1044 (e
< (struct ipt_entry
*)(base
+ info
->underflow
[i
])))
1045 newinfo
->underflow
[i
] -= off
;
1050 static int compat_table_info(const struct xt_table_info
*info
,
1051 struct xt_table_info
*newinfo
)
1053 struct ipt_entry
*iter
;
1054 void *loc_cpu_entry
;
1057 if (!newinfo
|| !info
)
1060 /* we dont care about newinfo->entries[] */
1061 memcpy(newinfo
, info
, offsetof(struct xt_table_info
, entries
));
1062 newinfo
->initial_entries
= 0;
1063 loc_cpu_entry
= info
->entries
[raw_smp_processor_id()];
1064 xt_compat_init_offsets(AF_INET
, info
->number
);
1065 xt_entry_foreach(iter
, loc_cpu_entry
, info
->size
) {
1066 ret
= compat_calc_entry(iter
, info
, loc_cpu_entry
, newinfo
);
1074 static int get_info(struct net
*net
, void __user
*user
,
1075 const int *len
, int compat
)
1077 char name
[XT_TABLE_MAXNAMELEN
];
1081 if (*len
!= sizeof(struct ipt_getinfo
)) {
1082 duprintf("length %u != %zu\n", *len
,
1083 sizeof(struct ipt_getinfo
));
1087 if (copy_from_user(name
, user
, sizeof(name
)) != 0)
1090 name
[XT_TABLE_MAXNAMELEN
-1] = '\0';
1091 #ifdef CONFIG_COMPAT
1093 xt_compat_lock(AF_INET
);
1095 t
= try_then_request_module(xt_find_table_lock(net
, AF_INET
, name
),
1096 "iptable_%s", name
);
1097 if (!IS_ERR_OR_NULL(t
)) {
1098 struct ipt_getinfo info
;
1099 const struct xt_table_info
*private = t
->private;
1100 #ifdef CONFIG_COMPAT
1101 struct xt_table_info tmp
;
1104 ret
= compat_table_info(private, &tmp
);
1105 xt_compat_flush_offsets(AF_INET
);
1109 memset(&info
, 0, sizeof(info
));
1110 info
.valid_hooks
= t
->valid_hooks
;
1111 memcpy(info
.hook_entry
, private->hook_entry
,
1112 sizeof(info
.hook_entry
));
1113 memcpy(info
.underflow
, private->underflow
,
1114 sizeof(info
.underflow
));
1115 info
.num_entries
= private->number
;
1116 info
.size
= private->size
;
1117 strcpy(info
.name
, name
);
1119 if (copy_to_user(user
, &info
, *len
) != 0)
1127 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1128 #ifdef CONFIG_COMPAT
1130 xt_compat_unlock(AF_INET
);
1136 get_entries(struct net
*net
, struct ipt_get_entries __user
*uptr
,
1140 struct ipt_get_entries get
;
1143 if (*len
< sizeof(get
)) {
1144 duprintf("get_entries: %u < %zu\n", *len
, sizeof(get
));
1147 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1149 if (*len
!= sizeof(struct ipt_get_entries
) + get
.size
) {
1150 duprintf("get_entries: %u != %zu\n",
1151 *len
, sizeof(get
) + get
.size
);
1155 t
= xt_find_table_lock(net
, AF_INET
, get
.name
);
1156 if (!IS_ERR_OR_NULL(t
)) {
1157 const struct xt_table_info
*private = t
->private;
1158 duprintf("t->private->number = %u\n", private->number
);
1159 if (get
.size
== private->size
)
1160 ret
= copy_entries_to_user(private->size
,
1161 t
, uptr
->entrytable
);
1163 duprintf("get_entries: I've got %u not %u!\n",
1164 private->size
, get
.size
);
1170 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1176 __do_replace(struct net
*net
, const char *name
, unsigned int valid_hooks
,
1177 struct xt_table_info
*newinfo
, unsigned int num_counters
,
1178 void __user
*counters_ptr
)
1182 struct xt_table_info
*oldinfo
;
1183 struct xt_counters
*counters
;
1184 void *loc_cpu_old_entry
;
1185 struct ipt_entry
*iter
;
1188 counters
= vzalloc(num_counters
* sizeof(struct xt_counters
));
1194 t
= try_then_request_module(xt_find_table_lock(net
, AF_INET
, name
),
1195 "iptable_%s", name
);
1196 if (IS_ERR_OR_NULL(t
)) {
1197 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1198 goto free_newinfo_counters_untrans
;
1202 if (valid_hooks
!= t
->valid_hooks
) {
1203 duprintf("Valid hook crap: %08X vs %08X\n",
1204 valid_hooks
, t
->valid_hooks
);
1209 oldinfo
= xt_replace_table(t
, num_counters
, newinfo
, &ret
);
1213 /* Update module usage count based on number of rules */
1214 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1215 oldinfo
->number
, oldinfo
->initial_entries
, newinfo
->number
);
1216 if ((oldinfo
->number
> oldinfo
->initial_entries
) ||
1217 (newinfo
->number
<= oldinfo
->initial_entries
))
1219 if ((oldinfo
->number
> oldinfo
->initial_entries
) &&
1220 (newinfo
->number
<= oldinfo
->initial_entries
))
1223 /* Get the old counters, and synchronize with replace */
1224 get_counters(oldinfo
, counters
);
1226 /* Decrease module usage counts and free resource */
1227 loc_cpu_old_entry
= oldinfo
->entries
[raw_smp_processor_id()];
1228 xt_entry_foreach(iter
, loc_cpu_old_entry
, oldinfo
->size
)
1229 cleanup_entry(iter
, net
);
1231 xt_free_table_info(oldinfo
);
1232 if (copy_to_user(counters_ptr
, counters
,
1233 sizeof(struct xt_counters
) * num_counters
) != 0) {
1234 /* Silent error, can't fail, new table is already in place */
1235 net_warn_ratelimited("iptables: counters copy to user failed while replacing table\n");
1244 free_newinfo_counters_untrans
:
1251 do_replace(struct net
*net
, const void __user
*user
, unsigned int len
)
1254 struct ipt_replace tmp
;
1255 struct xt_table_info
*newinfo
;
1256 void *loc_cpu_entry
;
1257 struct ipt_entry
*iter
;
1259 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1262 /* overflow check */
1263 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1265 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1267 newinfo
= xt_alloc_table_info(tmp
.size
);
1271 /* choose the copy that is on our node/cpu */
1272 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1273 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1279 ret
= translate_table(net
, newinfo
, loc_cpu_entry
, &tmp
);
1283 duprintf("Translated table\n");
1285 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1286 tmp
.num_counters
, tmp
.counters
);
1288 goto free_newinfo_untrans
;
1291 free_newinfo_untrans
:
1292 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1293 cleanup_entry(iter
, net
);
1295 xt_free_table_info(newinfo
);
1300 do_add_counters(struct net
*net
, const void __user
*user
,
1301 unsigned int len
, int compat
)
1303 unsigned int i
, curcpu
;
1304 struct xt_counters_info tmp
;
1305 struct xt_counters
*paddc
;
1306 unsigned int num_counters
;
1311 const struct xt_table_info
*private;
1313 void *loc_cpu_entry
;
1314 struct ipt_entry
*iter
;
1315 unsigned int addend
;
1316 #ifdef CONFIG_COMPAT
1317 struct compat_xt_counters_info compat_tmp
;
1321 size
= sizeof(struct compat_xt_counters_info
);
1326 size
= sizeof(struct xt_counters_info
);
1329 if (copy_from_user(ptmp
, user
, size
) != 0)
1332 #ifdef CONFIG_COMPAT
1334 num_counters
= compat_tmp
.num_counters
;
1335 name
= compat_tmp
.name
;
1339 num_counters
= tmp
.num_counters
;
1343 if (len
!= size
+ num_counters
* sizeof(struct xt_counters
))
1346 paddc
= vmalloc(len
- size
);
1350 if (copy_from_user(paddc
, user
+ size
, len
- size
) != 0) {
1355 t
= xt_find_table_lock(net
, AF_INET
, name
);
1356 if (IS_ERR_OR_NULL(t
)) {
1357 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1362 private = t
->private;
1363 if (private->number
!= num_counters
) {
1365 goto unlock_up_free
;
1369 /* Choose the copy that is on our node */
1370 curcpu
= smp_processor_id();
1371 loc_cpu_entry
= private->entries
[curcpu
];
1372 addend
= xt_write_recseq_begin();
1373 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
) {
1374 ADD_COUNTER(iter
->counters
, paddc
[i
].bcnt
, paddc
[i
].pcnt
);
1377 xt_write_recseq_end(addend
);
1388 #ifdef CONFIG_COMPAT
1389 struct compat_ipt_replace
{
1390 char name
[XT_TABLE_MAXNAMELEN
];
1394 u32 hook_entry
[NF_INET_NUMHOOKS
];
1395 u32 underflow
[NF_INET_NUMHOOKS
];
1397 compat_uptr_t counters
; /* struct xt_counters * */
1398 struct compat_ipt_entry entries
[0];
1402 compat_copy_entry_to_user(struct ipt_entry
*e
, void __user
**dstptr
,
1403 unsigned int *size
, struct xt_counters
*counters
,
1406 struct xt_entry_target
*t
;
1407 struct compat_ipt_entry __user
*ce
;
1408 u_int16_t target_offset
, next_offset
;
1409 compat_uint_t origsize
;
1410 const struct xt_entry_match
*ematch
;
1414 ce
= (struct compat_ipt_entry __user
*)*dstptr
;
1415 if (copy_to_user(ce
, e
, sizeof(struct ipt_entry
)) != 0 ||
1416 copy_to_user(&ce
->counters
, &counters
[i
],
1417 sizeof(counters
[i
])) != 0)
1420 *dstptr
+= sizeof(struct compat_ipt_entry
);
1421 *size
-= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1423 xt_ematch_foreach(ematch
, e
) {
1424 ret
= xt_compat_match_to_user(ematch
, dstptr
, size
);
1428 target_offset
= e
->target_offset
- (origsize
- *size
);
1429 t
= ipt_get_target(e
);
1430 ret
= xt_compat_target_to_user(t
, dstptr
, size
);
1433 next_offset
= e
->next_offset
- (origsize
- *size
);
1434 if (put_user(target_offset
, &ce
->target_offset
) != 0 ||
1435 put_user(next_offset
, &ce
->next_offset
) != 0)
1441 compat_find_calc_match(struct xt_entry_match
*m
,
1443 const struct ipt_ip
*ip
,
1444 unsigned int hookmask
,
1447 struct xt_match
*match
;
1449 match
= xt_request_find_match(NFPROTO_IPV4
, m
->u
.user
.name
,
1450 m
->u
.user
.revision
);
1451 if (IS_ERR(match
)) {
1452 duprintf("compat_check_calc_match: `%s' not found\n",
1454 return PTR_ERR(match
);
1456 m
->u
.kernel
.match
= match
;
1457 *size
+= xt_compat_match_offset(match
);
1461 static void compat_release_entry(struct compat_ipt_entry
*e
)
1463 struct xt_entry_target
*t
;
1464 struct xt_entry_match
*ematch
;
1466 /* Cleanup all matches */
1467 xt_ematch_foreach(ematch
, e
)
1468 module_put(ematch
->u
.kernel
.match
->me
);
1469 t
= compat_ipt_get_target(e
);
1470 module_put(t
->u
.kernel
.target
->me
);
1474 check_compat_entry_size_and_hooks(struct compat_ipt_entry
*e
,
1475 struct xt_table_info
*newinfo
,
1477 const unsigned char *base
,
1478 const unsigned char *limit
,
1479 const unsigned int *hook_entries
,
1480 const unsigned int *underflows
,
1483 struct xt_entry_match
*ematch
;
1484 struct xt_entry_target
*t
;
1485 struct xt_target
*target
;
1486 unsigned int entry_offset
;
1490 duprintf("check_compat_entry_size_and_hooks %p\n", e
);
1491 if ((unsigned long)e
% __alignof__(struct compat_ipt_entry
) != 0 ||
1492 (unsigned char *)e
+ sizeof(struct compat_ipt_entry
) >= limit
) {
1493 duprintf("Bad offset %p, limit = %p\n", e
, limit
);
1497 if (e
->next_offset
< sizeof(struct compat_ipt_entry
) +
1498 sizeof(struct compat_xt_entry_target
)) {
1499 duprintf("checking: element %p size %u\n",
1504 /* For purposes of check_entry casting the compat entry is fine */
1505 ret
= check_entry((struct ipt_entry
*)e
, name
);
1509 off
= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1510 entry_offset
= (void *)e
- (void *)base
;
1512 xt_ematch_foreach(ematch
, e
) {
1513 ret
= compat_find_calc_match(ematch
, name
,
1514 &e
->ip
, e
->comefrom
, &off
);
1516 goto release_matches
;
1520 t
= compat_ipt_get_target(e
);
1521 target
= xt_request_find_target(NFPROTO_IPV4
, t
->u
.user
.name
,
1522 t
->u
.user
.revision
);
1523 if (IS_ERR(target
)) {
1524 duprintf("check_compat_entry_size_and_hooks: `%s' not found\n",
1526 ret
= PTR_ERR(target
);
1527 goto release_matches
;
1529 t
->u
.kernel
.target
= target
;
1531 off
+= xt_compat_target_offset(target
);
1533 ret
= xt_compat_add_offset(AF_INET
, entry_offset
, off
);
1537 /* Check hooks & underflows */
1538 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
1539 if ((unsigned char *)e
- base
== hook_entries
[h
])
1540 newinfo
->hook_entry
[h
] = hook_entries
[h
];
1541 if ((unsigned char *)e
- base
== underflows
[h
])
1542 newinfo
->underflow
[h
] = underflows
[h
];
1545 /* Clear counters and comefrom */
1546 memset(&e
->counters
, 0, sizeof(e
->counters
));
1551 module_put(t
->u
.kernel
.target
->me
);
1553 xt_ematch_foreach(ematch
, e
) {
1556 module_put(ematch
->u
.kernel
.match
->me
);
1562 compat_copy_entry_from_user(struct compat_ipt_entry
*e
, void **dstptr
,
1563 unsigned int *size
, const char *name
,
1564 struct xt_table_info
*newinfo
, unsigned char *base
)
1566 struct xt_entry_target
*t
;
1567 struct xt_target
*target
;
1568 struct ipt_entry
*de
;
1569 unsigned int origsize
;
1571 struct xt_entry_match
*ematch
;
1575 de
= (struct ipt_entry
*)*dstptr
;
1576 memcpy(de
, e
, sizeof(struct ipt_entry
));
1577 memcpy(&de
->counters
, &e
->counters
, sizeof(e
->counters
));
1579 *dstptr
+= sizeof(struct ipt_entry
);
1580 *size
+= sizeof(struct ipt_entry
) - sizeof(struct compat_ipt_entry
);
1582 xt_ematch_foreach(ematch
, e
) {
1583 ret
= xt_compat_match_from_user(ematch
, dstptr
, size
);
1587 de
->target_offset
= e
->target_offset
- (origsize
- *size
);
1588 t
= compat_ipt_get_target(e
);
1589 target
= t
->u
.kernel
.target
;
1590 xt_compat_target_from_user(t
, dstptr
, size
);
1592 de
->next_offset
= e
->next_offset
- (origsize
- *size
);
1593 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
1594 if ((unsigned char *)de
- base
< newinfo
->hook_entry
[h
])
1595 newinfo
->hook_entry
[h
] -= origsize
- *size
;
1596 if ((unsigned char *)de
- base
< newinfo
->underflow
[h
])
1597 newinfo
->underflow
[h
] -= origsize
- *size
;
1603 compat_check_entry(struct ipt_entry
*e
, struct net
*net
, const char *name
)
1605 struct xt_entry_match
*ematch
;
1606 struct xt_mtchk_param mtpar
;
1613 mtpar
.entryinfo
= &e
->ip
;
1614 mtpar
.hook_mask
= e
->comefrom
;
1615 mtpar
.family
= NFPROTO_IPV4
;
1616 xt_ematch_foreach(ematch
, e
) {
1617 ret
= check_match(ematch
, &mtpar
);
1619 goto cleanup_matches
;
1623 ret
= check_target(e
, net
, name
);
1625 goto cleanup_matches
;
1629 xt_ematch_foreach(ematch
, e
) {
1632 cleanup_match(ematch
, net
);
1638 translate_compat_table(struct net
*net
,
1640 unsigned int valid_hooks
,
1641 struct xt_table_info
**pinfo
,
1643 unsigned int total_size
,
1644 unsigned int number
,
1645 unsigned int *hook_entries
,
1646 unsigned int *underflows
)
1649 struct xt_table_info
*newinfo
, *info
;
1650 void *pos
, *entry0
, *entry1
;
1651 struct compat_ipt_entry
*iter0
;
1652 struct ipt_entry
*iter1
;
1659 info
->number
= number
;
1661 /* Init all hooks to impossible value. */
1662 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1663 info
->hook_entry
[i
] = 0xFFFFFFFF;
1664 info
->underflow
[i
] = 0xFFFFFFFF;
1667 duprintf("translate_compat_table: size %u\n", info
->size
);
1669 xt_compat_lock(AF_INET
);
1670 xt_compat_init_offsets(AF_INET
, number
);
1671 /* Walk through entries, checking offsets. */
1672 xt_entry_foreach(iter0
, entry0
, total_size
) {
1673 ret
= check_compat_entry_size_and_hooks(iter0
, info
, &size
,
1675 entry0
+ total_size
,
1686 duprintf("translate_compat_table: %u not %u entries\n",
1691 /* Check hooks all assigned */
1692 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1693 /* Only hooks which are valid */
1694 if (!(valid_hooks
& (1 << i
)))
1696 if (info
->hook_entry
[i
] == 0xFFFFFFFF) {
1697 duprintf("Invalid hook entry %u %u\n",
1698 i
, hook_entries
[i
]);
1701 if (info
->underflow
[i
] == 0xFFFFFFFF) {
1702 duprintf("Invalid underflow %u %u\n",
1709 newinfo
= xt_alloc_table_info(size
);
1713 newinfo
->number
= number
;
1714 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
1715 newinfo
->hook_entry
[i
] = info
->hook_entry
[i
];
1716 newinfo
->underflow
[i
] = info
->underflow
[i
];
1718 entry1
= newinfo
->entries
[raw_smp_processor_id()];
1721 xt_entry_foreach(iter0
, entry0
, total_size
) {
1722 ret
= compat_copy_entry_from_user(iter0
, &pos
, &size
,
1723 name
, newinfo
, entry1
);
1727 xt_compat_flush_offsets(AF_INET
);
1728 xt_compat_unlock(AF_INET
);
1733 if (!mark_source_chains(newinfo
, valid_hooks
, entry1
))
1737 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1738 ret
= compat_check_entry(iter1
, net
, name
);
1742 if (strcmp(ipt_get_target(iter1
)->u
.user
.name
,
1743 XT_ERROR_TARGET
) == 0)
1744 ++newinfo
->stacksize
;
1748 * The first i matches need cleanup_entry (calls ->destroy)
1749 * because they had called ->check already. The other j-i
1750 * entries need only release.
1754 xt_entry_foreach(iter0
, entry0
, newinfo
->size
) {
1759 compat_release_entry(iter0
);
1761 xt_entry_foreach(iter1
, entry1
, newinfo
->size
) {
1764 cleanup_entry(iter1
, net
);
1766 xt_free_table_info(newinfo
);
1770 /* And one copy for every other CPU */
1771 for_each_possible_cpu(i
)
1772 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry1
)
1773 memcpy(newinfo
->entries
[i
], entry1
, newinfo
->size
);
1777 xt_free_table_info(info
);
1781 xt_free_table_info(newinfo
);
1783 xt_entry_foreach(iter0
, entry0
, total_size
) {
1786 compat_release_entry(iter0
);
1790 xt_compat_flush_offsets(AF_INET
);
1791 xt_compat_unlock(AF_INET
);
1796 compat_do_replace(struct net
*net
, void __user
*user
, unsigned int len
)
1799 struct compat_ipt_replace tmp
;
1800 struct xt_table_info
*newinfo
;
1801 void *loc_cpu_entry
;
1802 struct ipt_entry
*iter
;
1804 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1807 /* overflow check */
1808 if (tmp
.size
>= INT_MAX
/ num_possible_cpus())
1810 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1812 tmp
.name
[sizeof(tmp
.name
)-1] = 0;
1814 newinfo
= xt_alloc_table_info(tmp
.size
);
1818 /* choose the copy that is on our node/cpu */
1819 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1820 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1826 ret
= translate_compat_table(net
, tmp
.name
, tmp
.valid_hooks
,
1827 &newinfo
, &loc_cpu_entry
, tmp
.size
,
1828 tmp
.num_entries
, tmp
.hook_entry
,
1833 duprintf("compat_do_replace: Translated table\n");
1835 ret
= __do_replace(net
, tmp
.name
, tmp
.valid_hooks
, newinfo
,
1836 tmp
.num_counters
, compat_ptr(tmp
.counters
));
1838 goto free_newinfo_untrans
;
1841 free_newinfo_untrans
:
1842 xt_entry_foreach(iter
, loc_cpu_entry
, newinfo
->size
)
1843 cleanup_entry(iter
, net
);
1845 xt_free_table_info(newinfo
);
1850 compat_do_ipt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
,
1855 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1859 case IPT_SO_SET_REPLACE
:
1860 ret
= compat_do_replace(sock_net(sk
), user
, len
);
1863 case IPT_SO_SET_ADD_COUNTERS
:
1864 ret
= do_add_counters(sock_net(sk
), user
, len
, 1);
1868 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd
);
1875 struct compat_ipt_get_entries
{
1876 char name
[XT_TABLE_MAXNAMELEN
];
1878 struct compat_ipt_entry entrytable
[0];
1882 compat_copy_entries_to_user(unsigned int total_size
, struct xt_table
*table
,
1883 void __user
*userptr
)
1885 struct xt_counters
*counters
;
1886 const struct xt_table_info
*private = table
->private;
1890 const void *loc_cpu_entry
;
1892 struct ipt_entry
*iter
;
1894 counters
= alloc_counters(table
);
1895 if (IS_ERR(counters
))
1896 return PTR_ERR(counters
);
1898 /* choose the copy that is on our node/cpu, ...
1899 * This choice is lazy (because current thread is
1900 * allowed to migrate to another cpu)
1902 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1905 xt_entry_foreach(iter
, loc_cpu_entry
, total_size
) {
1906 ret
= compat_copy_entry_to_user(iter
, &pos
,
1907 &size
, counters
, i
++);
1917 compat_get_entries(struct net
*net
, struct compat_ipt_get_entries __user
*uptr
,
1921 struct compat_ipt_get_entries get
;
1924 if (*len
< sizeof(get
)) {
1925 duprintf("compat_get_entries: %u < %zu\n", *len
, sizeof(get
));
1929 if (copy_from_user(&get
, uptr
, sizeof(get
)) != 0)
1932 if (*len
!= sizeof(struct compat_ipt_get_entries
) + get
.size
) {
1933 duprintf("compat_get_entries: %u != %zu\n",
1934 *len
, sizeof(get
) + get
.size
);
1938 xt_compat_lock(AF_INET
);
1939 t
= xt_find_table_lock(net
, AF_INET
, get
.name
);
1940 if (!IS_ERR_OR_NULL(t
)) {
1941 const struct xt_table_info
*private = t
->private;
1942 struct xt_table_info info
;
1943 duprintf("t->private->number = %u\n", private->number
);
1944 ret
= compat_table_info(private, &info
);
1945 if (!ret
&& get
.size
== info
.size
) {
1946 ret
= compat_copy_entries_to_user(private->size
,
1947 t
, uptr
->entrytable
);
1949 duprintf("compat_get_entries: I've got %u not %u!\n",
1950 private->size
, get
.size
);
1953 xt_compat_flush_offsets(AF_INET
);
1957 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1959 xt_compat_unlock(AF_INET
);
1963 static int do_ipt_get_ctl(struct sock
*, int, void __user
*, int *);
1966 compat_do_ipt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
1970 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1974 case IPT_SO_GET_INFO
:
1975 ret
= get_info(sock_net(sk
), user
, len
, 1);
1977 case IPT_SO_GET_ENTRIES
:
1978 ret
= compat_get_entries(sock_net(sk
), user
, len
);
1981 ret
= do_ipt_get_ctl(sk
, cmd
, user
, len
);
1988 do_ipt_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
, unsigned int len
)
1992 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
1996 case IPT_SO_SET_REPLACE
:
1997 ret
= do_replace(sock_net(sk
), user
, len
);
2000 case IPT_SO_SET_ADD_COUNTERS
:
2001 ret
= do_add_counters(sock_net(sk
), user
, len
, 0);
2005 duprintf("do_ipt_set_ctl: unknown request %i\n", cmd
);
2013 do_ipt_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
2017 if (!ns_capable(sock_net(sk
)->user_ns
, CAP_NET_ADMIN
))
2021 case IPT_SO_GET_INFO
:
2022 ret
= get_info(sock_net(sk
), user
, len
, 0);
2025 case IPT_SO_GET_ENTRIES
:
2026 ret
= get_entries(sock_net(sk
), user
, len
);
2029 case IPT_SO_GET_REVISION_MATCH
:
2030 case IPT_SO_GET_REVISION_TARGET
: {
2031 struct xt_get_revision rev
;
2034 if (*len
!= sizeof(rev
)) {
2038 if (copy_from_user(&rev
, user
, sizeof(rev
)) != 0) {
2042 rev
.name
[sizeof(rev
.name
)-1] = 0;
2044 if (cmd
== IPT_SO_GET_REVISION_TARGET
)
2049 try_then_request_module(xt_find_revision(AF_INET
, rev
.name
,
2052 "ipt_%s", rev
.name
);
2057 duprintf("do_ipt_get_ctl: unknown request %i\n", cmd
);
2064 struct xt_table
*ipt_register_table(struct net
*net
,
2065 const struct xt_table
*table
,
2066 const struct ipt_replace
*repl
)
2069 struct xt_table_info
*newinfo
;
2070 struct xt_table_info bootstrap
= {0};
2071 void *loc_cpu_entry
;
2072 struct xt_table
*new_table
;
2074 newinfo
= xt_alloc_table_info(repl
->size
);
2080 /* choose the copy on our node/cpu, but dont care about preemption */
2081 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
2082 memcpy(loc_cpu_entry
, repl
->entries
, repl
->size
);
2084 ret
= translate_table(net
, newinfo
, loc_cpu_entry
, repl
);
2088 new_table
= xt_register_table(net
, table
, &bootstrap
, newinfo
);
2089 if (IS_ERR(new_table
)) {
2090 ret
= PTR_ERR(new_table
);
2097 xt_free_table_info(newinfo
);
2099 return ERR_PTR(ret
);
2102 void ipt_unregister_table(struct net
*net
, struct xt_table
*table
)
2104 struct xt_table_info
*private;
2105 void *loc_cpu_entry
;
2106 struct module
*table_owner
= table
->me
;
2107 struct ipt_entry
*iter
;
2109 private = xt_unregister_table(table
);
2111 /* Decrease module usage counts and free resources */
2112 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
2113 xt_entry_foreach(iter
, loc_cpu_entry
, private->size
)
2114 cleanup_entry(iter
, net
);
2115 if (private->number
> private->initial_entries
)
2116 module_put(table_owner
);
2117 xt_free_table_info(private);
2120 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
2122 icmp_type_code_match(u_int8_t test_type
, u_int8_t min_code
, u_int8_t max_code
,
2123 u_int8_t type
, u_int8_t code
,
2126 return ((test_type
== 0xFF) ||
2127 (type
== test_type
&& code
>= min_code
&& code
<= max_code
))
2132 icmp_match(const struct sk_buff
*skb
, struct xt_action_param
*par
)
2134 const struct icmphdr
*ic
;
2135 struct icmphdr _icmph
;
2136 const struct ipt_icmp
*icmpinfo
= par
->matchinfo
;
2138 /* Must not be a fragment. */
2139 if (par
->fragoff
!= 0)
2142 ic
= skb_header_pointer(skb
, par
->thoff
, sizeof(_icmph
), &_icmph
);
2144 /* We've been asked to examine this packet, and we
2145 * can't. Hence, no choice but to drop.
2147 duprintf("Dropping evil ICMP tinygram.\n");
2148 par
->hotdrop
= true;
2152 return icmp_type_code_match(icmpinfo
->type
,
2156 !!(icmpinfo
->invflags
&IPT_ICMP_INV
));
2159 static int icmp_checkentry(const struct xt_mtchk_param
*par
)
2161 const struct ipt_icmp
*icmpinfo
= par
->matchinfo
;
2163 /* Must specify no unknown invflags */
2164 return (icmpinfo
->invflags
& ~IPT_ICMP_INV
) ? -EINVAL
: 0;
2167 static struct xt_target ipt_builtin_tg
[] __read_mostly
= {
2169 .name
= XT_STANDARD_TARGET
,
2170 .targetsize
= sizeof(int),
2171 .family
= NFPROTO_IPV4
,
2172 #ifdef CONFIG_COMPAT
2173 .compatsize
= sizeof(compat_int_t
),
2174 .compat_from_user
= compat_standard_from_user
,
2175 .compat_to_user
= compat_standard_to_user
,
2179 .name
= XT_ERROR_TARGET
,
2180 .target
= ipt_error
,
2181 .targetsize
= XT_FUNCTION_MAXNAMELEN
,
2182 .family
= NFPROTO_IPV4
,
2186 static struct nf_sockopt_ops ipt_sockopts
= {
2188 .set_optmin
= IPT_BASE_CTL
,
2189 .set_optmax
= IPT_SO_SET_MAX
+1,
2190 .set
= do_ipt_set_ctl
,
2191 #ifdef CONFIG_COMPAT
2192 .compat_set
= compat_do_ipt_set_ctl
,
2194 .get_optmin
= IPT_BASE_CTL
,
2195 .get_optmax
= IPT_SO_GET_MAX
+1,
2196 .get
= do_ipt_get_ctl
,
2197 #ifdef CONFIG_COMPAT
2198 .compat_get
= compat_do_ipt_get_ctl
,
2200 .owner
= THIS_MODULE
,
2203 static struct xt_match ipt_builtin_mt
[] __read_mostly
= {
2206 .match
= icmp_match
,
2207 .matchsize
= sizeof(struct ipt_icmp
),
2208 .checkentry
= icmp_checkentry
,
2209 .proto
= IPPROTO_ICMP
,
2210 .family
= NFPROTO_IPV4
,
2214 static int __net_init
ip_tables_net_init(struct net
*net
)
2216 return xt_proto_init(net
, NFPROTO_IPV4
);
2219 static void __net_exit
ip_tables_net_exit(struct net
*net
)
2221 xt_proto_fini(net
, NFPROTO_IPV4
);
2224 static struct pernet_operations ip_tables_net_ops
= {
2225 .init
= ip_tables_net_init
,
2226 .exit
= ip_tables_net_exit
,
2229 static int __init
ip_tables_init(void)
2233 ret
= register_pernet_subsys(&ip_tables_net_ops
);
2237 /* No one else will be downing sem now, so we won't sleep */
2238 ret
= xt_register_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2241 ret
= xt_register_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2245 /* Register setsockopt */
2246 ret
= nf_register_sockopt(&ipt_sockopts
);
2250 pr_info("(C) 2000-2006 Netfilter Core Team\n");
2254 xt_unregister_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2256 xt_unregister_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2258 unregister_pernet_subsys(&ip_tables_net_ops
);
2263 static void __exit
ip_tables_fini(void)
2265 nf_unregister_sockopt(&ipt_sockopts
);
2267 xt_unregister_matches(ipt_builtin_mt
, ARRAY_SIZE(ipt_builtin_mt
));
2268 xt_unregister_targets(ipt_builtin_tg
, ARRAY_SIZE(ipt_builtin_tg
));
2269 unregister_pernet_subsys(&ip_tables_net_ops
);
2272 EXPORT_SYMBOL(ipt_register_table
);
2273 EXPORT_SYMBOL(ipt_unregister_table
);
2274 EXPORT_SYMBOL(ipt_do_table
);
2275 module_init(ip_tables_init
);
2276 module_exit(ip_tables_fini
);