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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/capability.h>
14 #include <linux/skbuff.h>
15 #include <linux/kmod.h>
16 #include <linux/vmalloc.h>
17 #include <linux/netdevice.h>
18 #include <linux/module.h>
19 #include <linux/poison.h>
20 #include <linux/icmpv6.h>
22 #include <asm/uaccess.h>
23 #include <linux/mutex.h>
24 #include <linux/proc_fs.h>
25 #include <linux/cpumask.h>
27 #include <linux/netfilter_ipv6/ip6_tables.h>
28 #include <linux/netfilter/x_tables.h>
30 MODULE_LICENSE("GPL");
31 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
32 MODULE_DESCRIPTION("IPv6 packet filter");
34 /*#define DEBUG_IP_FIREWALL*/
35 /*#define DEBUG_ALLOW_ALL*/ /* Useful for remote debugging */
36 /*#define DEBUG_IP_FIREWALL_USER*/
38 #ifdef DEBUG_IP_FIREWALL
39 #define dprintf(format, args...) printk(format , ## args)
41 #define dprintf(format, args...)
44 #ifdef DEBUG_IP_FIREWALL_USER
45 #define duprintf(format, args...) printk(format , ## args)
47 #define duprintf(format, args...)
50 #ifdef CONFIG_NETFILTER_DEBUG
51 #define IP_NF_ASSERT(x) \
54 printk("IP_NF_ASSERT: %s:%s:%u\n", \
55 __FUNCTION__, __FILE__, __LINE__); \
58 #define IP_NF_ASSERT(x)
62 /* All the better to debug you with... */
68 We keep a set of rules for each CPU, so we can avoid write-locking
69 them in the softirq when updating the counters and therefore
70 only need to read-lock in the softirq; doing a write_lock_bh() in user
71 context stops packets coming through and allows user context to read
72 the counters or update the rules.
74 Hence the start of any table is given by get_table() below. */
76 /* Check for an extension */
78 ip6t_ext_hdr(u8 nexthdr
)
80 return ( (nexthdr
== IPPROTO_HOPOPTS
) ||
81 (nexthdr
== IPPROTO_ROUTING
) ||
82 (nexthdr
== IPPROTO_FRAGMENT
) ||
83 (nexthdr
== IPPROTO_ESP
) ||
84 (nexthdr
== IPPROTO_AH
) ||
85 (nexthdr
== IPPROTO_NONE
) ||
86 (nexthdr
== IPPROTO_DSTOPTS
) );
89 /* Returns whether matches rule or not. */
91 ip6_packet_match(const struct sk_buff
*skb
,
94 const struct ip6t_ip6
*ip6info
,
95 unsigned int *protoff
,
96 int *fragoff
, bool *hotdrop
)
100 const struct ipv6hdr
*ipv6
= ipv6_hdr(skb
);
102 #define FWINV(bool,invflg) ((bool) ^ !!(ip6info->invflags & invflg))
104 if (FWINV(ipv6_masked_addr_cmp(&ipv6
->saddr
, &ip6info
->smsk
,
105 &ip6info
->src
), IP6T_INV_SRCIP
)
106 || FWINV(ipv6_masked_addr_cmp(&ipv6
->daddr
, &ip6info
->dmsk
,
107 &ip6info
->dst
), IP6T_INV_DSTIP
)) {
108 dprintf("Source or dest mismatch.\n");
110 dprintf("SRC: %u. Mask: %u. Target: %u.%s\n", ip->saddr,
111 ipinfo->smsk.s_addr, ipinfo->src.s_addr,
112 ipinfo->invflags & IP6T_INV_SRCIP ? " (INV)" : "");
113 dprintf("DST: %u. Mask: %u. Target: %u.%s\n", ip->daddr,
114 ipinfo->dmsk.s_addr, ipinfo->dst.s_addr,
115 ipinfo->invflags & IP6T_INV_DSTIP ? " (INV)" : "");*/
119 /* Look for ifname matches; this should unroll nicely. */
120 for (i
= 0, ret
= 0; i
< IFNAMSIZ
/sizeof(unsigned long); i
++) {
121 ret
|= (((const unsigned long *)indev
)[i
]
122 ^ ((const unsigned long *)ip6info
->iniface
)[i
])
123 & ((const unsigned long *)ip6info
->iniface_mask
)[i
];
126 if (FWINV(ret
!= 0, IP6T_INV_VIA_IN
)) {
127 dprintf("VIA in mismatch (%s vs %s).%s\n",
128 indev
, ip6info
->iniface
,
129 ip6info
->invflags
&IP6T_INV_VIA_IN
?" (INV)":"");
133 for (i
= 0, ret
= 0; i
< IFNAMSIZ
/sizeof(unsigned long); i
++) {
134 ret
|= (((const unsigned long *)outdev
)[i
]
135 ^ ((const unsigned long *)ip6info
->outiface
)[i
])
136 & ((const unsigned long *)ip6info
->outiface_mask
)[i
];
139 if (FWINV(ret
!= 0, IP6T_INV_VIA_OUT
)) {
140 dprintf("VIA out mismatch (%s vs %s).%s\n",
141 outdev
, ip6info
->outiface
,
142 ip6info
->invflags
&IP6T_INV_VIA_OUT
?" (INV)":"");
146 /* ... might want to do something with class and flowlabel here ... */
148 /* look for the desired protocol header */
149 if((ip6info
->flags
& IP6T_F_PROTO
)) {
151 unsigned short _frag_off
;
153 protohdr
= ipv6_find_hdr(skb
, protoff
, -1, &_frag_off
);
159 *fragoff
= _frag_off
;
161 dprintf("Packet protocol %hi ?= %s%hi.\n",
163 ip6info
->invflags
& IP6T_INV_PROTO
? "!":"",
166 if (ip6info
->proto
== protohdr
) {
167 if(ip6info
->invflags
& IP6T_INV_PROTO
) {
173 /* We need match for the '-p all', too! */
174 if ((ip6info
->proto
!= 0) &&
175 !(ip6info
->invflags
& IP6T_INV_PROTO
))
181 /* should be ip6 safe */
183 ip6_checkentry(const struct ip6t_ip6
*ipv6
)
185 if (ipv6
->flags
& ~IP6T_F_MASK
) {
186 duprintf("Unknown flag bits set: %08X\n",
187 ipv6
->flags
& ~IP6T_F_MASK
);
190 if (ipv6
->invflags
& ~IP6T_INV_MASK
) {
191 duprintf("Unknown invflag bits set: %08X\n",
192 ipv6
->invflags
& ~IP6T_INV_MASK
);
199 ip6t_error(struct sk_buff
*skb
,
200 const struct net_device
*in
,
201 const struct net_device
*out
,
202 unsigned int hooknum
,
203 const struct xt_target
*target
,
204 const void *targinfo
)
207 printk("ip6_tables: error: `%s'\n", (char *)targinfo
);
213 bool do_match(struct ip6t_entry_match
*m
,
214 const struct sk_buff
*skb
,
215 const struct net_device
*in
,
216 const struct net_device
*out
,
218 unsigned int protoff
,
221 /* Stop iteration if it doesn't match */
222 if (!m
->u
.kernel
.match
->match(skb
, in
, out
, m
->u
.kernel
.match
, m
->data
,
223 offset
, protoff
, hotdrop
))
229 static inline struct ip6t_entry
*
230 get_entry(void *base
, unsigned int offset
)
232 return (struct ip6t_entry
*)(base
+ offset
);
235 /* All zeroes == unconditional rule. */
237 unconditional(const struct ip6t_ip6
*ipv6
)
241 for (i
= 0; i
< sizeof(*ipv6
); i
++)
242 if (((char *)ipv6
)[i
])
245 return (i
== sizeof(*ipv6
));
248 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
249 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
250 /* This cries for unification! */
251 static const char *hooknames
[] = {
252 [NF_INET_PRE_ROUTING
] = "PREROUTING",
253 [NF_INET_LOCAL_IN
] = "INPUT",
254 [NF_INET_FORWARD
] = "FORWARD",
255 [NF_INET_LOCAL_OUT
] = "OUTPUT",
256 [NF_INET_POST_ROUTING
] = "POSTROUTING",
259 enum nf_ip_trace_comments
{
260 NF_IP6_TRACE_COMMENT_RULE
,
261 NF_IP6_TRACE_COMMENT_RETURN
,
262 NF_IP6_TRACE_COMMENT_POLICY
,
265 static const char *comments
[] = {
266 [NF_IP6_TRACE_COMMENT_RULE
] = "rule",
267 [NF_IP6_TRACE_COMMENT_RETURN
] = "return",
268 [NF_IP6_TRACE_COMMENT_POLICY
] = "policy",
271 static struct nf_loginfo trace_loginfo
= {
272 .type
= NF_LOG_TYPE_LOG
,
276 .logflags
= NF_LOG_MASK
,
282 get_chainname_rulenum(struct ip6t_entry
*s
, struct ip6t_entry
*e
,
283 char *hookname
, char **chainname
,
284 char **comment
, unsigned int *rulenum
)
286 struct ip6t_standard_target
*t
= (void *)ip6t_get_target(s
);
288 if (strcmp(t
->target
.u
.kernel
.target
->name
, IP6T_ERROR_TARGET
) == 0) {
289 /* Head of user chain: ERROR target with chainname */
290 *chainname
= t
->target
.data
;
295 if (s
->target_offset
== sizeof(struct ip6t_entry
)
296 && strcmp(t
->target
.u
.kernel
.target
->name
,
297 IP6T_STANDARD_TARGET
) == 0
299 && unconditional(&s
->ipv6
)) {
300 /* Tail of chains: STANDARD target (return/policy) */
301 *comment
= *chainname
== hookname
302 ? (char *)comments
[NF_IP6_TRACE_COMMENT_POLICY
]
303 : (char *)comments
[NF_IP6_TRACE_COMMENT_RETURN
];
312 static void trace_packet(struct sk_buff
*skb
,
314 const struct net_device
*in
,
315 const struct net_device
*out
,
317 struct xt_table_info
*private,
318 struct ip6t_entry
*e
)
321 struct ip6t_entry
*root
;
322 char *hookname
, *chainname
, *comment
;
323 unsigned int rulenum
= 0;
325 table_base
= (void *)private->entries
[smp_processor_id()];
326 root
= get_entry(table_base
, private->hook_entry
[hook
]);
328 hookname
= chainname
= (char *)hooknames
[hook
];
329 comment
= (char *)comments
[NF_IP6_TRACE_COMMENT_RULE
];
331 IP6T_ENTRY_ITERATE(root
,
332 private->size
- private->hook_entry
[hook
],
333 get_chainname_rulenum
,
334 e
, hookname
, &chainname
, &comment
, &rulenum
);
336 nf_log_packet(AF_INET6
, hook
, skb
, in
, out
, &trace_loginfo
,
337 "TRACE: %s:%s:%s:%u ",
338 tablename
, chainname
, comment
, rulenum
);
342 /* Returns one of the generic firewall policies, like NF_ACCEPT. */
344 ip6t_do_table(struct sk_buff
*skb
,
346 const struct net_device
*in
,
347 const struct net_device
*out
,
348 struct xt_table
*table
)
350 static const char nulldevname
[IFNAMSIZ
] __attribute__((aligned(sizeof(long))));
352 unsigned int protoff
= 0;
353 bool hotdrop
= false;
354 /* Initializing verdict to NF_DROP keeps gcc happy. */
355 unsigned int verdict
= NF_DROP
;
356 const char *indev
, *outdev
;
358 struct ip6t_entry
*e
, *back
;
359 struct xt_table_info
*private;
362 indev
= in
? in
->name
: nulldevname
;
363 outdev
= out
? out
->name
: nulldevname
;
364 /* We handle fragments by dealing with the first fragment as
365 * if it was a normal packet. All other fragments are treated
366 * normally, except that they will NEVER match rules that ask
367 * things we don't know, ie. tcp syn flag or ports). If the
368 * rule is also a fragment-specific rule, non-fragments won't
371 read_lock_bh(&table
->lock
);
372 private = table
->private;
373 IP_NF_ASSERT(table
->valid_hooks
& (1 << hook
));
374 table_base
= (void *)private->entries
[smp_processor_id()];
375 e
= get_entry(table_base
, private->hook_entry
[hook
]);
377 /* For return from builtin chain */
378 back
= get_entry(table_base
, private->underflow
[hook
]);
383 if (ip6_packet_match(skb
, indev
, outdev
, &e
->ipv6
,
384 &protoff
, &offset
, &hotdrop
)) {
385 struct ip6t_entry_target
*t
;
387 if (IP6T_MATCH_ITERATE(e
, do_match
,
389 offset
, protoff
, &hotdrop
) != 0)
392 ADD_COUNTER(e
->counters
,
393 ntohs(ipv6_hdr(skb
)->payload_len
) +
394 sizeof(struct ipv6hdr
), 1);
396 t
= ip6t_get_target(e
);
397 IP_NF_ASSERT(t
->u
.kernel
.target
);
399 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
400 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
401 /* The packet is traced: log it */
402 if (unlikely(skb
->nf_trace
))
403 trace_packet(skb
, hook
, in
, out
,
404 table
->name
, private, e
);
406 /* Standard target? */
407 if (!t
->u
.kernel
.target
->target
) {
410 v
= ((struct ip6t_standard_target
*)t
)->verdict
;
412 /* Pop from stack? */
413 if (v
!= IP6T_RETURN
) {
414 verdict
= (unsigned)(-v
) - 1;
418 back
= get_entry(table_base
,
422 if (table_base
+ v
!= (void *)e
+ e
->next_offset
423 && !(e
->ipv6
.flags
& IP6T_F_GOTO
)) {
424 /* Save old back ptr in next entry */
425 struct ip6t_entry
*next
426 = (void *)e
+ e
->next_offset
;
428 = (void *)back
- table_base
;
429 /* set back pointer to next entry */
433 e
= get_entry(table_base
, v
);
435 /* Targets which reenter must return
437 #ifdef CONFIG_NETFILTER_DEBUG
438 ((struct ip6t_entry
*)table_base
)->comefrom
441 verdict
= t
->u
.kernel
.target
->target(skb
,
447 #ifdef CONFIG_NETFILTER_DEBUG
448 if (((struct ip6t_entry
*)table_base
)->comefrom
450 && verdict
== IP6T_CONTINUE
) {
451 printk("Target %s reentered!\n",
452 t
->u
.kernel
.target
->name
);
455 ((struct ip6t_entry
*)table_base
)->comefrom
458 if (verdict
== IP6T_CONTINUE
)
459 e
= (void *)e
+ e
->next_offset
;
467 e
= (void *)e
+ e
->next_offset
;
471 #ifdef CONFIG_NETFILTER_DEBUG
472 ((struct ip6t_entry
*)table_base
)->comefrom
= NETFILTER_LINK_POISON
;
474 read_unlock_bh(&table
->lock
);
476 #ifdef DEBUG_ALLOW_ALL
485 /* Figures out from what hook each rule can be called: returns 0 if
486 there are loops. Puts hook bitmask in comefrom. */
488 mark_source_chains(struct xt_table_info
*newinfo
,
489 unsigned int valid_hooks
, void *entry0
)
493 /* No recursion; use packet counter to save back ptrs (reset
494 to 0 as we leave), and comefrom to save source hook bitmask */
495 for (hook
= 0; hook
< NF_INET_NUMHOOKS
; hook
++) {
496 unsigned int pos
= newinfo
->hook_entry
[hook
];
498 = (struct ip6t_entry
*)(entry0
+ pos
);
499 int visited
= e
->comefrom
& (1 << hook
);
501 if (!(valid_hooks
& (1 << hook
)))
504 /* Set initial back pointer. */
505 e
->counters
.pcnt
= pos
;
508 struct ip6t_standard_target
*t
509 = (void *)ip6t_get_target(e
);
511 if (e
->comefrom
& (1 << NF_INET_NUMHOOKS
)) {
512 printk("iptables: loop hook %u pos %u %08X.\n",
513 hook
, pos
, e
->comefrom
);
517 |= ((1 << hook
) | (1 << NF_INET_NUMHOOKS
));
519 /* Unconditional return/END. */
520 if ((e
->target_offset
== sizeof(struct ip6t_entry
)
521 && (strcmp(t
->target
.u
.user
.name
,
522 IP6T_STANDARD_TARGET
) == 0)
524 && unconditional(&e
->ipv6
)) || visited
) {
525 unsigned int oldpos
, size
;
527 if (t
->verdict
< -NF_MAX_VERDICT
- 1) {
528 duprintf("mark_source_chains: bad "
529 "negative verdict (%i)\n",
534 /* Return: backtrack through the last
537 e
->comefrom
^= (1<<NF_INET_NUMHOOKS
);
538 #ifdef DEBUG_IP_FIREWALL_USER
540 & (1 << NF_INET_NUMHOOKS
)) {
541 duprintf("Back unset "
548 pos
= e
->counters
.pcnt
;
549 e
->counters
.pcnt
= 0;
551 /* We're at the start. */
555 e
= (struct ip6t_entry
*)
557 } while (oldpos
== pos
+ e
->next_offset
);
560 size
= e
->next_offset
;
561 e
= (struct ip6t_entry
*)
562 (entry0
+ pos
+ size
);
563 e
->counters
.pcnt
= pos
;
566 int newpos
= t
->verdict
;
568 if (strcmp(t
->target
.u
.user
.name
,
569 IP6T_STANDARD_TARGET
) == 0
571 if (newpos
> newinfo
->size
-
572 sizeof(struct ip6t_entry
)) {
573 duprintf("mark_source_chains: "
574 "bad verdict (%i)\n",
578 /* This a jump; chase it. */
579 duprintf("Jump rule %u -> %u\n",
582 /* ... this is a fallthru */
583 newpos
= pos
+ e
->next_offset
;
585 e
= (struct ip6t_entry
*)
587 e
->counters
.pcnt
= pos
;
592 duprintf("Finished chain %u\n", hook
);
598 cleanup_match(struct ip6t_entry_match
*m
, unsigned int *i
)
600 if (i
&& (*i
)-- == 0)
603 if (m
->u
.kernel
.match
->destroy
)
604 m
->u
.kernel
.match
->destroy(m
->u
.kernel
.match
, m
->data
);
605 module_put(m
->u
.kernel
.match
->me
);
610 check_entry(struct ip6t_entry
*e
, const char *name
)
612 struct ip6t_entry_target
*t
;
614 if (!ip6_checkentry(&e
->ipv6
)) {
615 duprintf("ip_tables: ip check failed %p %s.\n", e
, name
);
619 if (e
->target_offset
+ sizeof(struct ip6t_entry_target
) >
623 t
= ip6t_get_target(e
);
624 if (e
->target_offset
+ t
->u
.target_size
> e
->next_offset
)
630 static inline int check_match(struct ip6t_entry_match
*m
, const char *name
,
631 const struct ip6t_ip6
*ipv6
,
632 unsigned int hookmask
, unsigned int *i
)
634 struct xt_match
*match
;
637 match
= m
->u
.kernel
.match
;
638 ret
= xt_check_match(match
, AF_INET6
, m
->u
.match_size
- sizeof(*m
),
639 name
, hookmask
, ipv6
->proto
,
640 ipv6
->invflags
& IP6T_INV_PROTO
);
641 if (!ret
&& m
->u
.kernel
.match
->checkentry
642 && !m
->u
.kernel
.match
->checkentry(name
, ipv6
, match
, m
->data
,
644 duprintf("ip_tables: check failed for `%s'.\n",
645 m
->u
.kernel
.match
->name
);
654 find_check_match(struct ip6t_entry_match
*m
,
656 const struct ip6t_ip6
*ipv6
,
657 unsigned int hookmask
,
660 struct xt_match
*match
;
663 match
= try_then_request_module(xt_find_match(AF_INET6
, m
->u
.user
.name
,
665 "ip6t_%s", m
->u
.user
.name
);
666 if (IS_ERR(match
) || !match
) {
667 duprintf("find_check_match: `%s' not found\n", m
->u
.user
.name
);
668 return match
? PTR_ERR(match
) : -ENOENT
;
670 m
->u
.kernel
.match
= match
;
672 ret
= check_match(m
, name
, ipv6
, hookmask
, i
);
678 module_put(m
->u
.kernel
.match
->me
);
682 static inline int check_target(struct ip6t_entry
*e
, const char *name
)
684 struct ip6t_entry_target
*t
;
685 struct xt_target
*target
;
688 t
= ip6t_get_target(e
);
689 target
= t
->u
.kernel
.target
;
690 ret
= xt_check_target(target
, AF_INET6
, t
->u
.target_size
- sizeof(*t
),
691 name
, e
->comefrom
, e
->ipv6
.proto
,
692 e
->ipv6
.invflags
& IP6T_INV_PROTO
);
693 if (!ret
&& t
->u
.kernel
.target
->checkentry
694 && !t
->u
.kernel
.target
->checkentry(name
, e
, target
, t
->data
,
696 duprintf("ip_tables: check failed for `%s'.\n",
697 t
->u
.kernel
.target
->name
);
704 find_check_entry(struct ip6t_entry
*e
, const char *name
, unsigned int size
,
707 struct ip6t_entry_target
*t
;
708 struct xt_target
*target
;
712 ret
= check_entry(e
, name
);
717 ret
= IP6T_MATCH_ITERATE(e
, find_check_match
, name
, &e
->ipv6
,
720 goto cleanup_matches
;
722 t
= ip6t_get_target(e
);
723 target
= try_then_request_module(xt_find_target(AF_INET6
,
726 "ip6t_%s", t
->u
.user
.name
);
727 if (IS_ERR(target
) || !target
) {
728 duprintf("find_check_entry: `%s' not found\n", t
->u
.user
.name
);
729 ret
= target
? PTR_ERR(target
) : -ENOENT
;
730 goto cleanup_matches
;
732 t
->u
.kernel
.target
= target
;
734 ret
= check_target(e
, name
);
741 module_put(t
->u
.kernel
.target
->me
);
743 IP6T_MATCH_ITERATE(e
, cleanup_match
, &j
);
748 check_entry_size_and_hooks(struct ip6t_entry
*e
,
749 struct xt_table_info
*newinfo
,
751 unsigned char *limit
,
752 const unsigned int *hook_entries
,
753 const unsigned int *underflows
,
758 if ((unsigned long)e
% __alignof__(struct ip6t_entry
) != 0
759 || (unsigned char *)e
+ sizeof(struct ip6t_entry
) >= limit
) {
760 duprintf("Bad offset %p\n", e
);
765 < sizeof(struct ip6t_entry
) + sizeof(struct ip6t_entry_target
)) {
766 duprintf("checking: element %p size %u\n",
771 /* Check hooks & underflows */
772 for (h
= 0; h
< NF_INET_NUMHOOKS
; h
++) {
773 if ((unsigned char *)e
- base
== hook_entries
[h
])
774 newinfo
->hook_entry
[h
] = hook_entries
[h
];
775 if ((unsigned char *)e
- base
== underflows
[h
])
776 newinfo
->underflow
[h
] = underflows
[h
];
779 /* FIXME: underflows must be unconditional, standard verdicts
780 < 0 (not IP6T_RETURN). --RR */
782 /* Clear counters and comefrom */
783 e
->counters
= ((struct xt_counters
) { 0, 0 });
791 cleanup_entry(struct ip6t_entry
*e
, unsigned int *i
)
793 struct ip6t_entry_target
*t
;
795 if (i
&& (*i
)-- == 0)
798 /* Cleanup all matches */
799 IP6T_MATCH_ITERATE(e
, cleanup_match
, NULL
);
800 t
= ip6t_get_target(e
);
801 if (t
->u
.kernel
.target
->destroy
)
802 t
->u
.kernel
.target
->destroy(t
->u
.kernel
.target
, t
->data
);
803 module_put(t
->u
.kernel
.target
->me
);
807 /* Checks and translates the user-supplied table segment (held in
810 translate_table(const char *name
,
811 unsigned int valid_hooks
,
812 struct xt_table_info
*newinfo
,
816 const unsigned int *hook_entries
,
817 const unsigned int *underflows
)
822 newinfo
->size
= size
;
823 newinfo
->number
= number
;
825 /* Init all hooks to impossible value. */
826 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
827 newinfo
->hook_entry
[i
] = 0xFFFFFFFF;
828 newinfo
->underflow
[i
] = 0xFFFFFFFF;
831 duprintf("translate_table: size %u\n", newinfo
->size
);
833 /* Walk through entries, checking offsets. */
834 ret
= IP6T_ENTRY_ITERATE(entry0
, newinfo
->size
,
835 check_entry_size_and_hooks
,
839 hook_entries
, underflows
, &i
);
844 duprintf("translate_table: %u not %u entries\n",
849 /* Check hooks all assigned */
850 for (i
= 0; i
< NF_INET_NUMHOOKS
; i
++) {
851 /* Only hooks which are valid */
852 if (!(valid_hooks
& (1 << i
)))
854 if (newinfo
->hook_entry
[i
] == 0xFFFFFFFF) {
855 duprintf("Invalid hook entry %u %u\n",
859 if (newinfo
->underflow
[i
] == 0xFFFFFFFF) {
860 duprintf("Invalid underflow %u %u\n",
866 if (!mark_source_chains(newinfo
, valid_hooks
, entry0
))
869 /* Finally, each sanity check must pass */
871 ret
= IP6T_ENTRY_ITERATE(entry0
, newinfo
->size
,
872 find_check_entry
, name
, size
, &i
);
875 IP6T_ENTRY_ITERATE(entry0
, newinfo
->size
,
880 /* And one copy for every other CPU */
881 for_each_possible_cpu(i
) {
882 if (newinfo
->entries
[i
] && newinfo
->entries
[i
] != entry0
)
883 memcpy(newinfo
->entries
[i
], entry0
, newinfo
->size
);
891 add_entry_to_counter(const struct ip6t_entry
*e
,
892 struct xt_counters total
[],
895 ADD_COUNTER(total
[*i
], e
->counters
.bcnt
, e
->counters
.pcnt
);
902 set_entry_to_counter(const struct ip6t_entry
*e
,
903 struct ip6t_counters total
[],
906 SET_COUNTER(total
[*i
], e
->counters
.bcnt
, e
->counters
.pcnt
);
913 get_counters(const struct xt_table_info
*t
,
914 struct xt_counters counters
[])
920 /* Instead of clearing (by a previous call to memset())
921 * the counters and using adds, we set the counters
922 * with data used by 'current' CPU
923 * We dont care about preemption here.
925 curcpu
= raw_smp_processor_id();
928 IP6T_ENTRY_ITERATE(t
->entries
[curcpu
],
930 set_entry_to_counter
,
934 for_each_possible_cpu(cpu
) {
938 IP6T_ENTRY_ITERATE(t
->entries
[cpu
],
940 add_entry_to_counter
,
947 copy_entries_to_user(unsigned int total_size
,
948 struct xt_table
*table
,
949 void __user
*userptr
)
951 unsigned int off
, num
, countersize
;
952 struct ip6t_entry
*e
;
953 struct xt_counters
*counters
;
954 struct xt_table_info
*private = table
->private;
958 /* We need atomic snapshot of counters: rest doesn't change
959 (other than comefrom, which userspace doesn't care
961 countersize
= sizeof(struct xt_counters
) * private->number
;
962 counters
= vmalloc(countersize
);
964 if (counters
== NULL
)
967 /* First, sum counters... */
968 write_lock_bh(&table
->lock
);
969 get_counters(private, counters
);
970 write_unlock_bh(&table
->lock
);
972 /* choose the copy that is on ourc node/cpu */
973 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
974 if (copy_to_user(userptr
, loc_cpu_entry
, total_size
) != 0) {
979 /* FIXME: use iterator macros --RR */
980 /* ... then go back and fix counters and names */
981 for (off
= 0, num
= 0; off
< total_size
; off
+= e
->next_offset
, num
++){
983 struct ip6t_entry_match
*m
;
984 struct ip6t_entry_target
*t
;
986 e
= (struct ip6t_entry
*)(loc_cpu_entry
+ off
);
987 if (copy_to_user(userptr
+ off
988 + offsetof(struct ip6t_entry
, counters
),
990 sizeof(counters
[num
])) != 0) {
995 for (i
= sizeof(struct ip6t_entry
);
996 i
< e
->target_offset
;
997 i
+= m
->u
.match_size
) {
1000 if (copy_to_user(userptr
+ off
+ i
1001 + offsetof(struct ip6t_entry_match
,
1003 m
->u
.kernel
.match
->name
,
1004 strlen(m
->u
.kernel
.match
->name
)+1)
1011 t
= ip6t_get_target(e
);
1012 if (copy_to_user(userptr
+ off
+ e
->target_offset
1013 + offsetof(struct ip6t_entry_target
,
1015 t
->u
.kernel
.target
->name
,
1016 strlen(t
->u
.kernel
.target
->name
)+1) != 0) {
1028 get_entries(const struct ip6t_get_entries
*entries
,
1029 struct ip6t_get_entries __user
*uptr
)
1034 t
= xt_find_table_lock(AF_INET6
, entries
->name
);
1035 if (t
&& !IS_ERR(t
)) {
1036 struct xt_table_info
*private = t
->private;
1037 duprintf("t->private->number = %u\n", private->number
);
1038 if (entries
->size
== private->size
)
1039 ret
= copy_entries_to_user(private->size
,
1040 t
, uptr
->entrytable
);
1042 duprintf("get_entries: I've got %u not %u!\n",
1043 private->size
, entries
->size
);
1049 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1055 do_replace(void __user
*user
, unsigned int len
)
1058 struct ip6t_replace tmp
;
1060 struct xt_table_info
*newinfo
, *oldinfo
;
1061 struct xt_counters
*counters
;
1062 void *loc_cpu_entry
, *loc_cpu_old_entry
;
1064 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1067 /* overflow check */
1068 if (tmp
.num_counters
>= INT_MAX
/ sizeof(struct xt_counters
))
1071 newinfo
= xt_alloc_table_info(tmp
.size
);
1075 /* choose the copy that is on our node/cpu */
1076 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1077 if (copy_from_user(loc_cpu_entry
, user
+ sizeof(tmp
),
1083 counters
= vmalloc(tmp
.num_counters
* sizeof(struct xt_counters
));
1089 ret
= translate_table(tmp
.name
, tmp
.valid_hooks
,
1090 newinfo
, loc_cpu_entry
, tmp
.size
, tmp
.num_entries
,
1091 tmp
.hook_entry
, tmp
.underflow
);
1093 goto free_newinfo_counters
;
1095 duprintf("ip_tables: Translated table\n");
1097 t
= try_then_request_module(xt_find_table_lock(AF_INET6
, tmp
.name
),
1098 "ip6table_%s", tmp
.name
);
1099 if (!t
|| IS_ERR(t
)) {
1100 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1101 goto free_newinfo_counters_untrans
;
1105 if (tmp
.valid_hooks
!= t
->valid_hooks
) {
1106 duprintf("Valid hook crap: %08X vs %08X\n",
1107 tmp
.valid_hooks
, t
->valid_hooks
);
1112 oldinfo
= xt_replace_table(t
, tmp
.num_counters
, newinfo
, &ret
);
1116 /* Update module usage count based on number of rules */
1117 duprintf("do_replace: oldnum=%u, initnum=%u, newnum=%u\n",
1118 oldinfo
->number
, oldinfo
->initial_entries
, newinfo
->number
);
1119 if ((oldinfo
->number
> oldinfo
->initial_entries
) ||
1120 (newinfo
->number
<= oldinfo
->initial_entries
))
1122 if ((oldinfo
->number
> oldinfo
->initial_entries
) &&
1123 (newinfo
->number
<= oldinfo
->initial_entries
))
1126 /* Get the old counters. */
1127 get_counters(oldinfo
, counters
);
1128 /* Decrease module usage counts and free resource */
1129 loc_cpu_old_entry
= oldinfo
->entries
[raw_smp_processor_id()];
1130 IP6T_ENTRY_ITERATE(loc_cpu_old_entry
, oldinfo
->size
, cleanup_entry
,NULL
);
1131 xt_free_table_info(oldinfo
);
1132 if (copy_to_user(tmp
.counters
, counters
,
1133 sizeof(struct xt_counters
) * tmp
.num_counters
) != 0)
1142 free_newinfo_counters_untrans
:
1143 IP6T_ENTRY_ITERATE(loc_cpu_entry
, newinfo
->size
, cleanup_entry
,NULL
);
1144 free_newinfo_counters
:
1147 xt_free_table_info(newinfo
);
1151 /* We're lazy, and add to the first CPU; overflow works its fey magic
1152 * and everything is OK. */
1154 add_counter_to_entry(struct ip6t_entry
*e
,
1155 const struct xt_counters addme
[],
1159 duprintf("add_counter: Entry %u %lu/%lu + %lu/%lu\n",
1161 (long unsigned int)e
->counters
.pcnt
,
1162 (long unsigned int)e
->counters
.bcnt
,
1163 (long unsigned int)addme
[*i
].pcnt
,
1164 (long unsigned int)addme
[*i
].bcnt
);
1167 ADD_COUNTER(e
->counters
, addme
[*i
].bcnt
, addme
[*i
].pcnt
);
1174 do_add_counters(void __user
*user
, unsigned int len
)
1177 struct xt_counters_info tmp
, *paddc
;
1178 struct xt_table_info
*private;
1181 void *loc_cpu_entry
;
1183 if (copy_from_user(&tmp
, user
, sizeof(tmp
)) != 0)
1186 if (len
!= sizeof(tmp
) + tmp
.num_counters
*sizeof(struct xt_counters
))
1189 paddc
= vmalloc(len
);
1193 if (copy_from_user(paddc
, user
, len
) != 0) {
1198 t
= xt_find_table_lock(AF_INET6
, tmp
.name
);
1199 if (!t
|| IS_ERR(t
)) {
1200 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1204 write_lock_bh(&t
->lock
);
1205 private = t
->private;
1206 if (private->number
!= tmp
.num_counters
) {
1208 goto unlock_up_free
;
1212 /* Choose the copy that is on our node */
1213 loc_cpu_entry
= private->entries
[smp_processor_id()];
1214 IP6T_ENTRY_ITERATE(loc_cpu_entry
,
1216 add_counter_to_entry
,
1220 write_unlock_bh(&t
->lock
);
1230 do_ip6t_set_ctl(struct sock
*sk
, int cmd
, void __user
*user
, unsigned int len
)
1234 if (!capable(CAP_NET_ADMIN
))
1238 case IP6T_SO_SET_REPLACE
:
1239 ret
= do_replace(user
, len
);
1242 case IP6T_SO_SET_ADD_COUNTERS
:
1243 ret
= do_add_counters(user
, len
);
1247 duprintf("do_ip6t_set_ctl: unknown request %i\n", cmd
);
1255 do_ip6t_get_ctl(struct sock
*sk
, int cmd
, void __user
*user
, int *len
)
1259 if (!capable(CAP_NET_ADMIN
))
1263 case IP6T_SO_GET_INFO
: {
1264 char name
[IP6T_TABLE_MAXNAMELEN
];
1267 if (*len
!= sizeof(struct ip6t_getinfo
)) {
1268 duprintf("length %u != %u\n", *len
,
1269 sizeof(struct ip6t_getinfo
));
1274 if (copy_from_user(name
, user
, sizeof(name
)) != 0) {
1278 name
[IP6T_TABLE_MAXNAMELEN
-1] = '\0';
1280 t
= try_then_request_module(xt_find_table_lock(AF_INET6
, name
),
1281 "ip6table_%s", name
);
1282 if (t
&& !IS_ERR(t
)) {
1283 struct ip6t_getinfo info
;
1284 struct xt_table_info
*private = t
->private;
1286 info
.valid_hooks
= t
->valid_hooks
;
1287 memcpy(info
.hook_entry
, private->hook_entry
,
1288 sizeof(info
.hook_entry
));
1289 memcpy(info
.underflow
, private->underflow
,
1290 sizeof(info
.underflow
));
1291 info
.num_entries
= private->number
;
1292 info
.size
= private->size
;
1293 memcpy(info
.name
, name
, sizeof(info
.name
));
1295 if (copy_to_user(user
, &info
, *len
) != 0)
1302 ret
= t
? PTR_ERR(t
) : -ENOENT
;
1306 case IP6T_SO_GET_ENTRIES
: {
1307 struct ip6t_get_entries get
;
1309 if (*len
< sizeof(get
)) {
1310 duprintf("get_entries: %u < %u\n", *len
, sizeof(get
));
1312 } else if (copy_from_user(&get
, user
, sizeof(get
)) != 0) {
1314 } else if (*len
!= sizeof(struct ip6t_get_entries
) + get
.size
) {
1315 duprintf("get_entries: %u != %u\n", *len
,
1316 sizeof(struct ip6t_get_entries
) + get
.size
);
1319 ret
= get_entries(&get
, user
);
1323 case IP6T_SO_GET_REVISION_MATCH
:
1324 case IP6T_SO_GET_REVISION_TARGET
: {
1325 struct ip6t_get_revision rev
;
1328 if (*len
!= sizeof(rev
)) {
1332 if (copy_from_user(&rev
, user
, sizeof(rev
)) != 0) {
1337 if (cmd
== IP6T_SO_GET_REVISION_TARGET
)
1342 try_then_request_module(xt_find_revision(AF_INET6
, rev
.name
,
1345 "ip6t_%s", rev
.name
);
1350 duprintf("do_ip6t_get_ctl: unknown request %i\n", cmd
);
1357 int ip6t_register_table(struct xt_table
*table
,
1358 const struct ip6t_replace
*repl
)
1361 struct xt_table_info
*newinfo
;
1362 struct xt_table_info bootstrap
1363 = { 0, 0, 0, { 0 }, { 0 }, { } };
1364 void *loc_cpu_entry
;
1366 newinfo
= xt_alloc_table_info(repl
->size
);
1370 /* choose the copy on our node/cpu */
1371 loc_cpu_entry
= newinfo
->entries
[raw_smp_processor_id()];
1372 memcpy(loc_cpu_entry
, repl
->entries
, repl
->size
);
1374 ret
= translate_table(table
->name
, table
->valid_hooks
,
1375 newinfo
, loc_cpu_entry
, repl
->size
,
1380 xt_free_table_info(newinfo
);
1384 ret
= xt_register_table(table
, &bootstrap
, newinfo
);
1386 xt_free_table_info(newinfo
);
1393 void ip6t_unregister_table(struct xt_table
*table
)
1395 struct xt_table_info
*private;
1396 void *loc_cpu_entry
;
1398 private = xt_unregister_table(table
);
1400 /* Decrease module usage counts and free resources */
1401 loc_cpu_entry
= private->entries
[raw_smp_processor_id()];
1402 IP6T_ENTRY_ITERATE(loc_cpu_entry
, private->size
, cleanup_entry
, NULL
);
1403 xt_free_table_info(private);
1406 /* Returns 1 if the type and code is matched by the range, 0 otherwise */
1408 icmp6_type_code_match(u_int8_t test_type
, u_int8_t min_code
, u_int8_t max_code
,
1409 u_int8_t type
, u_int8_t code
,
1412 return (type
== test_type
&& code
>= min_code
&& code
<= max_code
)
1417 icmp6_match(const struct sk_buff
*skb
,
1418 const struct net_device
*in
,
1419 const struct net_device
*out
,
1420 const struct xt_match
*match
,
1421 const void *matchinfo
,
1423 unsigned int protoff
,
1426 struct icmp6hdr _icmp
, *ic
;
1427 const struct ip6t_icmp
*icmpinfo
= matchinfo
;
1429 /* Must not be a fragment. */
1433 ic
= skb_header_pointer(skb
, protoff
, sizeof(_icmp
), &_icmp
);
1435 /* We've been asked to examine this packet, and we
1436 can't. Hence, no choice but to drop. */
1437 duprintf("Dropping evil ICMP tinygram.\n");
1442 return icmp6_type_code_match(icmpinfo
->type
,
1445 ic
->icmp6_type
, ic
->icmp6_code
,
1446 !!(icmpinfo
->invflags
&IP6T_ICMP_INV
));
1449 /* Called when user tries to insert an entry of this type. */
1451 icmp6_checkentry(const char *tablename
,
1453 const struct xt_match
*match
,
1455 unsigned int hook_mask
)
1457 const struct ip6t_icmp
*icmpinfo
= matchinfo
;
1459 /* Must specify no unknown invflags */
1460 return !(icmpinfo
->invflags
& ~IP6T_ICMP_INV
);
1463 /* The built-in targets: standard (NULL) and error. */
1464 static struct xt_target ip6t_standard_target __read_mostly
= {
1465 .name
= IP6T_STANDARD_TARGET
,
1466 .targetsize
= sizeof(int),
1470 static struct xt_target ip6t_error_target __read_mostly
= {
1471 .name
= IP6T_ERROR_TARGET
,
1472 .target
= ip6t_error
,
1473 .targetsize
= IP6T_FUNCTION_MAXNAMELEN
,
1477 static struct nf_sockopt_ops ip6t_sockopts
= {
1479 .set_optmin
= IP6T_BASE_CTL
,
1480 .set_optmax
= IP6T_SO_SET_MAX
+1,
1481 .set
= do_ip6t_set_ctl
,
1482 .get_optmin
= IP6T_BASE_CTL
,
1483 .get_optmax
= IP6T_SO_GET_MAX
+1,
1484 .get
= do_ip6t_get_ctl
,
1485 .owner
= THIS_MODULE
,
1488 static struct xt_match icmp6_matchstruct __read_mostly
= {
1490 .match
= &icmp6_match
,
1491 .matchsize
= sizeof(struct ip6t_icmp
),
1492 .checkentry
= icmp6_checkentry
,
1493 .proto
= IPPROTO_ICMPV6
,
1497 static int __init
ip6_tables_init(void)
1501 ret
= xt_proto_init(AF_INET6
);
1505 /* Noone else will be downing sem now, so we won't sleep */
1506 ret
= xt_register_target(&ip6t_standard_target
);
1509 ret
= xt_register_target(&ip6t_error_target
);
1512 ret
= xt_register_match(&icmp6_matchstruct
);
1516 /* Register setsockopt */
1517 ret
= nf_register_sockopt(&ip6t_sockopts
);
1521 printk(KERN_INFO
"ip6_tables: (C) 2000-2006 Netfilter Core Team\n");
1525 xt_unregister_match(&icmp6_matchstruct
);
1527 xt_unregister_target(&ip6t_error_target
);
1529 xt_unregister_target(&ip6t_standard_target
);
1531 xt_proto_fini(AF_INET6
);
1536 static void __exit
ip6_tables_fini(void)
1538 nf_unregister_sockopt(&ip6t_sockopts
);
1539 xt_unregister_match(&icmp6_matchstruct
);
1540 xt_unregister_target(&ip6t_error_target
);
1541 xt_unregister_target(&ip6t_standard_target
);
1542 xt_proto_fini(AF_INET6
);
1546 * find the offset to specified header or the protocol number of last header
1547 * if target < 0. "last header" is transport protocol header, ESP, or
1550 * If target header is found, its offset is set in *offset and return protocol
1551 * number. Otherwise, return -1.
1553 * If the first fragment doesn't contain the final protocol header or
1554 * NEXTHDR_NONE it is considered invalid.
1556 * Note that non-1st fragment is special case that "the protocol number
1557 * of last header" is "next header" field in Fragment header. In this case,
1558 * *offset is meaningless and fragment offset is stored in *fragoff if fragoff
1562 int ipv6_find_hdr(const struct sk_buff
*skb
, unsigned int *offset
,
1563 int target
, unsigned short *fragoff
)
1565 unsigned int start
= skb_network_offset(skb
) + sizeof(struct ipv6hdr
);
1566 u8 nexthdr
= ipv6_hdr(skb
)->nexthdr
;
1567 unsigned int len
= skb
->len
- start
;
1572 while (nexthdr
!= target
) {
1573 struct ipv6_opt_hdr _hdr
, *hp
;
1574 unsigned int hdrlen
;
1576 if ((!ipv6_ext_hdr(nexthdr
)) || nexthdr
== NEXTHDR_NONE
) {
1582 hp
= skb_header_pointer(skb
, start
, sizeof(_hdr
), &_hdr
);
1585 if (nexthdr
== NEXTHDR_FRAGMENT
) {
1586 unsigned short _frag_off
;
1588 fp
= skb_header_pointer(skb
,
1589 start
+offsetof(struct frag_hdr
,
1596 _frag_off
= ntohs(*fp
) & ~0x7;
1599 ((!ipv6_ext_hdr(hp
->nexthdr
)) ||
1600 hp
->nexthdr
== NEXTHDR_NONE
)) {
1602 *fragoff
= _frag_off
;
1608 } else if (nexthdr
== NEXTHDR_AUTH
)
1609 hdrlen
= (hp
->hdrlen
+ 2) << 2;
1611 hdrlen
= ipv6_optlen(hp
);
1613 nexthdr
= hp
->nexthdr
;
1622 EXPORT_SYMBOL(ip6t_register_table
);
1623 EXPORT_SYMBOL(ip6t_unregister_table
);
1624 EXPORT_SYMBOL(ip6t_do_table
);
1625 EXPORT_SYMBOL(ip6t_ext_hdr
);
1626 EXPORT_SYMBOL(ipv6_find_hdr
);
1628 module_init(ip6_tables_init
);
1629 module_exit(ip6_tables_fini
);