1 /* netfilter.c: look after the filters for various protocols.
2 * Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
4 * Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
7 * Rusty Russell (C)2000 -- This code is GPL.
9 * February 2000: Modified by James Morris to have 1 queue per protocol.
10 * 15-Mar-2000: Added NF_REPEAT --RR.
11 * 08-May-2003: Internal logging interface added by Jozsef Kadlecsik.
13 #include <linux/config.h>
14 #include <linux/kernel.h>
15 #include <linux/netfilter.h>
16 #include <net/protocol.h>
17 #include <linux/init.h>
18 #include <linux/skbuff.h>
19 #include <linux/wait.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
23 #include <linux/netdevice.h>
24 #include <linux/inetdevice.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/icmp.h>
29 #include <net/route.h>
32 /* In this code, we can be waiting indefinitely for userspace to
33 * service a packet if a hook returns NF_QUEUE. We could keep a count
34 * of skbuffs queued for userspace, and not deregister a hook unless
35 * this is zero, but that sucks. Now, we simply check when the
36 * packets come back: if the hook is gone, the packet is discarded. */
37 #ifdef CONFIG_NETFILTER_DEBUG
38 #define NFDEBUG(format, args...) printk(format , ## args)
40 #define NFDEBUG(format, args...)
43 /* Sockopts only registered and called from user context, so
44 net locking would be overkill. Also, [gs]etsockopt calls may
46 static DECLARE_MUTEX(nf_sockopt_mutex
);
48 struct list_head nf_hooks
[NPROTO
][NF_MAX_HOOKS
];
49 static LIST_HEAD(nf_sockopts
);
50 static DEFINE_SPINLOCK(nf_hook_lock
);
53 * A queue handler may be registered for each protocol. Each is protected by
54 * long term mutex. The handler must provide an an outfn() to accept packets
55 * for queueing and must reinject all packets it receives, no matter what.
57 static struct nf_queue_handler_t
{
58 nf_queue_outfn_t outfn
;
60 } queue_handler
[NPROTO
];
61 static DEFINE_RWLOCK(queue_handler_lock
);
63 int nf_register_hook(struct nf_hook_ops
*reg
)
67 spin_lock_bh(&nf_hook_lock
);
68 list_for_each(i
, &nf_hooks
[reg
->pf
][reg
->hooknum
]) {
69 if (reg
->priority
< ((struct nf_hook_ops
*)i
)->priority
)
72 list_add_rcu(®
->list
, i
->prev
);
73 spin_unlock_bh(&nf_hook_lock
);
79 void nf_unregister_hook(struct nf_hook_ops
*reg
)
81 spin_lock_bh(&nf_hook_lock
);
82 list_del_rcu(®
->list
);
83 spin_unlock_bh(&nf_hook_lock
);
88 /* Do exclusive ranges overlap? */
89 static inline int overlap(int min1
, int max1
, int min2
, int max2
)
91 return max1
> min2
&& min1
< max2
;
94 /* Functions to register sockopt ranges (exclusive). */
95 int nf_register_sockopt(struct nf_sockopt_ops
*reg
)
100 if (down_interruptible(&nf_sockopt_mutex
) != 0)
103 list_for_each(i
, &nf_sockopts
) {
104 struct nf_sockopt_ops
*ops
= (struct nf_sockopt_ops
*)i
;
105 if (ops
->pf
== reg
->pf
106 && (overlap(ops
->set_optmin
, ops
->set_optmax
,
107 reg
->set_optmin
, reg
->set_optmax
)
108 || overlap(ops
->get_optmin
, ops
->get_optmax
,
109 reg
->get_optmin
, reg
->get_optmax
))) {
110 NFDEBUG("nf_sock overlap: %u-%u/%u-%u v %u-%u/%u-%u\n",
111 ops
->set_optmin
, ops
->set_optmax
,
112 ops
->get_optmin
, ops
->get_optmax
,
113 reg
->set_optmin
, reg
->set_optmax
,
114 reg
->get_optmin
, reg
->get_optmax
);
120 list_add(®
->list
, &nf_sockopts
);
122 up(&nf_sockopt_mutex
);
126 void nf_unregister_sockopt(struct nf_sockopt_ops
*reg
)
128 /* No point being interruptible: we're probably in cleanup_module() */
130 down(&nf_sockopt_mutex
);
132 /* To be woken by nf_sockopt call... */
133 /* FIXME: Stuart Young's name appears gratuitously. */
134 set_current_state(TASK_UNINTERRUPTIBLE
);
135 reg
->cleanup_task
= current
;
136 up(&nf_sockopt_mutex
);
140 list_del(®
->list
);
141 up(&nf_sockopt_mutex
);
144 #ifdef CONFIG_NETFILTER_DEBUG
147 #include <linux/netfilter_ipv4.h>
149 static void debug_print_hooks_ip(unsigned int nf_debug
)
151 if (nf_debug
& (1 << NF_IP_PRE_ROUTING
)) {
152 printk("PRE_ROUTING ");
153 nf_debug
^= (1 << NF_IP_PRE_ROUTING
);
155 if (nf_debug
& (1 << NF_IP_LOCAL_IN
)) {
157 nf_debug
^= (1 << NF_IP_LOCAL_IN
);
159 if (nf_debug
& (1 << NF_IP_FORWARD
)) {
161 nf_debug
^= (1 << NF_IP_FORWARD
);
163 if (nf_debug
& (1 << NF_IP_LOCAL_OUT
)) {
164 printk("LOCAL_OUT ");
165 nf_debug
^= (1 << NF_IP_LOCAL_OUT
);
167 if (nf_debug
& (1 << NF_IP_POST_ROUTING
)) {
168 printk("POST_ROUTING ");
169 nf_debug
^= (1 << NF_IP_POST_ROUTING
);
172 printk("Crap bits: 0x%04X", nf_debug
);
176 static void nf_dump_skb(int pf
, struct sk_buff
*skb
)
178 printk("skb: pf=%i %s dev=%s len=%u\n",
180 skb
->sk
? "(owned)" : "(unowned)",
181 skb
->dev
? skb
->dev
->name
: "(no dev)",
185 const struct iphdr
*ip
= skb
->nh
.iph
;
186 __u32
*opt
= (__u32
*) (ip
+ 1);
188 __u16 src_port
= 0, dst_port
= 0;
190 if (ip
->protocol
== IPPROTO_TCP
191 || ip
->protocol
== IPPROTO_UDP
) {
192 struct tcphdr
*tcp
=(struct tcphdr
*)((__u32
*)ip
+ip
->ihl
);
193 src_port
= ntohs(tcp
->source
);
194 dst_port
= ntohs(tcp
->dest
);
197 printk("PROTO=%d %u.%u.%u.%u:%hu %u.%u.%u.%u:%hu"
198 " L=%hu S=0x%2.2hX I=%hu F=0x%4.4hX T=%hu",
199 ip
->protocol
, NIPQUAD(ip
->saddr
),
200 src_port
, NIPQUAD(ip
->daddr
),
202 ntohs(ip
->tot_len
), ip
->tos
, ntohs(ip
->id
),
203 ntohs(ip
->frag_off
), ip
->ttl
);
205 for (opti
= 0; opti
< (ip
->ihl
- sizeof(struct iphdr
) / 4); opti
++)
206 printk(" O=0x%8.8X", *opt
++);
212 void nf_debug_ip_local_deliver(struct sk_buff
*skb
)
214 /* If it's a loopback packet, it must have come through
215 * NF_IP_LOCAL_OUT, NF_IP_RAW_INPUT, NF_IP_PRE_ROUTING and
216 * NF_IP_LOCAL_IN. Otherwise, must have gone through
217 * NF_IP_RAW_INPUT and NF_IP_PRE_ROUTING. */
219 printk("ip_local_deliver: skb->dev is NULL.\n");
221 else if (strcmp(skb
->dev
->name
, "lo") == 0) {
222 if (skb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
223 | (1 << NF_IP_POST_ROUTING
)
224 | (1 << NF_IP_PRE_ROUTING
)
225 | (1 << NF_IP_LOCAL_IN
))) {
226 printk("ip_local_deliver: bad loopback skb: ");
227 debug_print_hooks_ip(skb
->nf_debug
);
228 nf_dump_skb(PF_INET
, skb
);
232 if (skb
->nf_debug
!= ((1<<NF_IP_PRE_ROUTING
)
233 | (1<<NF_IP_LOCAL_IN
))) {
234 printk("ip_local_deliver: bad non-lo skb: ");
235 debug_print_hooks_ip(skb
->nf_debug
);
236 nf_dump_skb(PF_INET
, skb
);
241 void nf_debug_ip_loopback_xmit(struct sk_buff
*newskb
)
243 if (newskb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
244 | (1 << NF_IP_POST_ROUTING
))) {
245 printk("ip_dev_loopback_xmit: bad owned skb = %p: ",
247 debug_print_hooks_ip(newskb
->nf_debug
);
248 nf_dump_skb(PF_INET
, newskb
);
250 /* Clear to avoid confusing input check */
251 newskb
->nf_debug
= 0;
254 void nf_debug_ip_finish_output2(struct sk_buff
*skb
)
256 /* If it's owned, it must have gone through the
257 * NF_IP_LOCAL_OUT and NF_IP_POST_ROUTING.
258 * Otherwise, must have gone through
259 * NF_IP_PRE_ROUTING, NF_IP_FORWARD and NF_IP_POST_ROUTING.
262 if (skb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
263 | (1 << NF_IP_POST_ROUTING
))) {
264 printk("ip_finish_output: bad owned skb = %p: ", skb
);
265 debug_print_hooks_ip(skb
->nf_debug
);
266 nf_dump_skb(PF_INET
, skb
);
269 if (skb
->nf_debug
!= ((1 << NF_IP_PRE_ROUTING
)
270 | (1 << NF_IP_FORWARD
)
271 | (1 << NF_IP_POST_ROUTING
))) {
272 /* Fragments, entunnelled packets, TCP RSTs
273 generated by ipt_REJECT will have no
274 owners, but still may be local */
275 if (skb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
276 | (1 << NF_IP_POST_ROUTING
))){
277 printk("ip_finish_output:"
278 " bad unowned skb = %p: ",skb
);
279 debug_print_hooks_ip(skb
->nf_debug
);
280 nf_dump_skb(PF_INET
, skb
);
285 #endif /*CONFIG_NETFILTER_DEBUG*/
287 /* Call get/setsockopt() */
288 static int nf_sockopt(struct sock
*sk
, int pf
, int val
,
289 char __user
*opt
, int *len
, int get
)
292 struct nf_sockopt_ops
*ops
;
295 if (down_interruptible(&nf_sockopt_mutex
) != 0)
298 list_for_each(i
, &nf_sockopts
) {
299 ops
= (struct nf_sockopt_ops
*)i
;
302 if (val
>= ops
->get_optmin
303 && val
< ops
->get_optmax
) {
305 up(&nf_sockopt_mutex
);
306 ret
= ops
->get(sk
, val
, opt
, len
);
310 if (val
>= ops
->set_optmin
311 && val
< ops
->set_optmax
) {
313 up(&nf_sockopt_mutex
);
314 ret
= ops
->set(sk
, val
, opt
, *len
);
320 up(&nf_sockopt_mutex
);
324 down(&nf_sockopt_mutex
);
326 if (ops
->cleanup_task
)
327 wake_up_process(ops
->cleanup_task
);
328 up(&nf_sockopt_mutex
);
332 int nf_setsockopt(struct sock
*sk
, int pf
, int val
, char __user
*opt
,
335 return nf_sockopt(sk
, pf
, val
, opt
, &len
, 0);
338 int nf_getsockopt(struct sock
*sk
, int pf
, int val
, char __user
*opt
, int *len
)
340 return nf_sockopt(sk
, pf
, val
, opt
, len
, 1);
343 static unsigned int nf_iterate(struct list_head
*head
,
344 struct sk_buff
**skb
,
346 const struct net_device
*indev
,
347 const struct net_device
*outdev
,
348 struct list_head
**i
,
349 int (*okfn
)(struct sk_buff
*),
352 unsigned int verdict
;
355 * The caller must not block between calls to this
356 * function because of risk of continuing from deleted element.
358 list_for_each_continue_rcu(*i
, head
) {
359 struct nf_hook_ops
*elem
= (struct nf_hook_ops
*)*i
;
361 if (hook_thresh
> elem
->priority
)
364 /* Optimization: we don't need to hold module
365 reference here, since function can't sleep. --RR */
366 verdict
= elem
->hook(hook
, skb
, indev
, outdev
, okfn
);
367 if (verdict
!= NF_ACCEPT
) {
368 #ifdef CONFIG_NETFILTER_DEBUG
369 if (unlikely(verdict
> NF_MAX_VERDICT
)) {
370 NFDEBUG("Evil return from %p(%u).\n",
375 if (verdict
!= NF_REPEAT
)
383 int nf_register_queue_handler(int pf
, nf_queue_outfn_t outfn
, void *data
)
387 write_lock_bh(&queue_handler_lock
);
388 if (queue_handler
[pf
].outfn
)
391 queue_handler
[pf
].outfn
= outfn
;
392 queue_handler
[pf
].data
= data
;
395 write_unlock_bh(&queue_handler_lock
);
400 /* The caller must flush their queue before this */
401 int nf_unregister_queue_handler(int pf
)
403 write_lock_bh(&queue_handler_lock
);
404 queue_handler
[pf
].outfn
= NULL
;
405 queue_handler
[pf
].data
= NULL
;
406 write_unlock_bh(&queue_handler_lock
);
412 * Any packet that leaves via this function must come back
413 * through nf_reinject().
415 static int nf_queue(struct sk_buff
*skb
,
416 struct list_head
*elem
,
417 int pf
, unsigned int hook
,
418 struct net_device
*indev
,
419 struct net_device
*outdev
,
420 int (*okfn
)(struct sk_buff
*))
423 struct nf_info
*info
;
424 #ifdef CONFIG_BRIDGE_NETFILTER
425 struct net_device
*physindev
= NULL
;
426 struct net_device
*physoutdev
= NULL
;
429 /* QUEUE == DROP if noone is waiting, to be safe. */
430 read_lock(&queue_handler_lock
);
431 if (!queue_handler
[pf
].outfn
) {
432 read_unlock(&queue_handler_lock
);
437 info
= kmalloc(sizeof(*info
), GFP_ATOMIC
);
440 printk(KERN_ERR
"OOM queueing packet %p\n",
442 read_unlock(&queue_handler_lock
);
447 *info
= (struct nf_info
) {
448 (struct nf_hook_ops
*)elem
, pf
, hook
, indev
, outdev
, okfn
};
450 /* If it's going away, ignore hook. */
451 if (!try_module_get(info
->elem
->owner
)) {
452 read_unlock(&queue_handler_lock
);
457 /* Bump dev refs so they don't vanish while packet is out */
458 if (indev
) dev_hold(indev
);
459 if (outdev
) dev_hold(outdev
);
461 #ifdef CONFIG_BRIDGE_NETFILTER
462 if (skb
->nf_bridge
) {
463 physindev
= skb
->nf_bridge
->physindev
;
464 if (physindev
) dev_hold(physindev
);
465 physoutdev
= skb
->nf_bridge
->physoutdev
;
466 if (physoutdev
) dev_hold(physoutdev
);
470 status
= queue_handler
[pf
].outfn(skb
, info
, queue_handler
[pf
].data
);
471 read_unlock(&queue_handler_lock
);
474 /* James M doesn't say fuck enough. */
475 if (indev
) dev_put(indev
);
476 if (outdev
) dev_put(outdev
);
477 #ifdef CONFIG_BRIDGE_NETFILTER
478 if (physindev
) dev_put(physindev
);
479 if (physoutdev
) dev_put(physoutdev
);
481 module_put(info
->elem
->owner
);
489 /* Returns 1 if okfn() needs to be executed by the caller,
490 * -EPERM for NF_DROP, 0 otherwise. */
491 int nf_hook_slow(int pf
, unsigned int hook
, struct sk_buff
**pskb
,
492 struct net_device
*indev
,
493 struct net_device
*outdev
,
494 int (*okfn
)(struct sk_buff
*),
497 struct list_head
*elem
;
498 unsigned int verdict
;
501 /* We may already have this, but read-locks nest anyway */
504 #ifdef CONFIG_NETFILTER_DEBUG
505 if (unlikely((*pskb
)->nf_debug
& (1 << hook
))) {
506 printk("nf_hook: hook %i already set.\n", hook
);
507 nf_dump_skb(pf
, *pskb
);
509 (*pskb
)->nf_debug
|= (1 << hook
);
512 elem
= &nf_hooks
[pf
][hook
];
514 verdict
= nf_iterate(&nf_hooks
[pf
][hook
], pskb
, hook
, indev
,
515 outdev
, &elem
, okfn
, hook_thresh
);
516 if (verdict
== NF_ACCEPT
|| verdict
== NF_STOP
) {
519 } else if (verdict
== NF_DROP
) {
522 } else if (verdict
== NF_QUEUE
) {
523 NFDEBUG("nf_hook: Verdict = QUEUE.\n");
524 if (!nf_queue(*pskb
, elem
, pf
, hook
, indev
, outdev
, okfn
))
532 void nf_reinject(struct sk_buff
*skb
, struct nf_info
*info
,
533 unsigned int verdict
)
535 struct list_head
*elem
= &info
->elem
->list
;
540 /* Release those devices we held, or Alexey will kill me. */
541 if (info
->indev
) dev_put(info
->indev
);
542 if (info
->outdev
) dev_put(info
->outdev
);
543 #ifdef CONFIG_BRIDGE_NETFILTER
544 if (skb
->nf_bridge
) {
545 if (skb
->nf_bridge
->physindev
)
546 dev_put(skb
->nf_bridge
->physindev
);
547 if (skb
->nf_bridge
->physoutdev
)
548 dev_put(skb
->nf_bridge
->physoutdev
);
552 /* Drop reference to owner of hook which queued us. */
553 module_put(info
->elem
->owner
);
555 list_for_each_rcu(i
, &nf_hooks
[info
->pf
][info
->hook
]) {
560 if (elem
== &nf_hooks
[info
->pf
][info
->hook
]) {
561 /* The module which sent it to userspace is gone. */
562 NFDEBUG("%s: module disappeared, dropping packet.\n",
567 /* Continue traversal iff userspace said ok... */
568 if (verdict
== NF_REPEAT
) {
573 if (verdict
== NF_ACCEPT
) {
575 verdict
= nf_iterate(&nf_hooks
[info
->pf
][info
->hook
],
577 info
->indev
, info
->outdev
, &elem
,
578 info
->okfn
, INT_MIN
);
587 if (!nf_queue(skb
, elem
, info
->pf
, info
->hook
,
588 info
->indev
, info
->outdev
, info
->okfn
))
594 if (verdict
== NF_DROP
)
602 /* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
603 int ip_route_me_harder(struct sk_buff
**pskb
)
605 struct iphdr
*iph
= (*pskb
)->nh
.iph
;
607 struct flowi fl
= {};
608 struct dst_entry
*odst
;
611 /* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
612 * packets with foreign saddr to appear on the NF_IP_LOCAL_OUT hook.
614 if (inet_addr_type(iph
->saddr
) == RTN_LOCAL
) {
615 fl
.nl_u
.ip4_u
.daddr
= iph
->daddr
;
616 fl
.nl_u
.ip4_u
.saddr
= iph
->saddr
;
617 fl
.nl_u
.ip4_u
.tos
= RT_TOS(iph
->tos
);
618 fl
.oif
= (*pskb
)->sk
? (*pskb
)->sk
->sk_bound_dev_if
: 0;
619 #ifdef CONFIG_IP_ROUTE_FWMARK
620 fl
.nl_u
.ip4_u
.fwmark
= (*pskb
)->nfmark
;
622 fl
.proto
= iph
->protocol
;
623 if (ip_route_output_key(&rt
, &fl
) != 0)
626 /* Drop old route. */
627 dst_release((*pskb
)->dst
);
628 (*pskb
)->dst
= &rt
->u
.dst
;
630 /* non-local src, find valid iif to satisfy
631 * rp-filter when calling ip_route_input. */
632 fl
.nl_u
.ip4_u
.daddr
= iph
->saddr
;
633 if (ip_route_output_key(&rt
, &fl
) != 0)
637 if (ip_route_input(*pskb
, iph
->daddr
, iph
->saddr
,
638 RT_TOS(iph
->tos
), rt
->u
.dst
.dev
) != 0) {
639 dst_release(&rt
->u
.dst
);
642 dst_release(&rt
->u
.dst
);
646 if ((*pskb
)->dst
->error
)
649 /* Change in oif may mean change in hh_len. */
650 hh_len
= (*pskb
)->dst
->dev
->hard_header_len
;
651 if (skb_headroom(*pskb
) < hh_len
) {
652 struct sk_buff
*nskb
;
654 nskb
= skb_realloc_headroom(*pskb
, hh_len
);
658 skb_set_owner_w(nskb
, (*pskb
)->sk
);
665 EXPORT_SYMBOL(ip_route_me_harder
);
667 int skb_ip_make_writable(struct sk_buff
**pskb
, unsigned int writable_len
)
669 struct sk_buff
*nskb
;
671 if (writable_len
> (*pskb
)->len
)
674 /* Not exclusive use of packet? Must copy. */
675 if (skb_shared(*pskb
) || skb_cloned(*pskb
))
678 return pskb_may_pull(*pskb
, writable_len
);
681 nskb
= skb_copy(*pskb
, GFP_ATOMIC
);
684 BUG_ON(skb_is_nonlinear(nskb
));
686 /* Rest of kernel will get very unhappy if we pass it a
687 suddenly-orphaned skbuff */
689 skb_set_owner_w(nskb
, (*pskb
)->sk
);
694 EXPORT_SYMBOL(skb_ip_make_writable
);
695 #endif /*CONFIG_INET*/
697 /* Internal logging interface, which relies on the real
698 LOG target modules */
700 #define NF_LOG_PREFIXLEN 128
702 static nf_logfn
*nf_logging
[NPROTO
]; /* = NULL */
703 static int reported
= 0;
704 static DEFINE_SPINLOCK(nf_log_lock
);
706 int nf_log_register(int pf
, nf_logfn
*logfn
)
710 /* Any setup of logging members must be done before
711 * substituting pointer. */
712 spin_lock(&nf_log_lock
);
713 if (!nf_logging
[pf
]) {
714 rcu_assign_pointer(nf_logging
[pf
], logfn
);
717 spin_unlock(&nf_log_lock
);
721 void nf_log_unregister(int pf
, nf_logfn
*logfn
)
723 spin_lock(&nf_log_lock
);
724 if (nf_logging
[pf
] == logfn
)
725 nf_logging
[pf
] = NULL
;
726 spin_unlock(&nf_log_lock
);
728 /* Give time to concurrent readers. */
732 void nf_log_packet(int pf
,
733 unsigned int hooknum
,
734 const struct sk_buff
*skb
,
735 const struct net_device
*in
,
736 const struct net_device
*out
,
737 const char *fmt
, ...)
740 char prefix
[NF_LOG_PREFIXLEN
];
744 logfn
= rcu_dereference(nf_logging
[pf
]);
747 vsnprintf(prefix
, sizeof(prefix
), fmt
, args
);
749 /* We must read logging before nf_logfn[pf] */
750 logfn(hooknum
, skb
, in
, out
, prefix
);
751 } else if (!reported
) {
752 printk(KERN_WARNING
"nf_log_packet: can\'t log yet, "
753 "no backend logging module loaded in!\n");
758 EXPORT_SYMBOL(nf_log_register
);
759 EXPORT_SYMBOL(nf_log_unregister
);
760 EXPORT_SYMBOL(nf_log_packet
);
762 /* This does not belong here, but locally generated errors need it if connection
763 tracking in use: without this, connection may not be in hash table, and hence
764 manufactured ICMP or RST packets will not be associated with it. */
765 void (*ip_ct_attach
)(struct sk_buff
*, struct sk_buff
*);
767 void nf_ct_attach(struct sk_buff
*new, struct sk_buff
*skb
)
769 void (*attach
)(struct sk_buff
*, struct sk_buff
*);
771 if (skb
->nfct
&& (attach
= ip_ct_attach
) != NULL
) {
772 mb(); /* Just to be sure: must be read before executing this */
777 void __init
netfilter_init(void)
781 for (i
= 0; i
< NPROTO
; i
++) {
782 for (h
= 0; h
< NF_MAX_HOOKS
; h
++)
783 INIT_LIST_HEAD(&nf_hooks
[i
][h
]);
787 EXPORT_SYMBOL(ip_ct_attach
);
788 EXPORT_SYMBOL(nf_ct_attach
);
789 EXPORT_SYMBOL(nf_getsockopt
);
790 EXPORT_SYMBOL(nf_hook_slow
);
791 EXPORT_SYMBOL(nf_hooks
);
792 EXPORT_SYMBOL(nf_register_hook
);
793 EXPORT_SYMBOL(nf_register_queue_handler
);
794 EXPORT_SYMBOL(nf_register_sockopt
);
795 EXPORT_SYMBOL(nf_reinject
);
796 EXPORT_SYMBOL(nf_setsockopt
);
797 EXPORT_SYMBOL(nf_unregister_hook
);
798 EXPORT_SYMBOL(nf_unregister_queue_handler
);
799 EXPORT_SYMBOL(nf_unregister_sockopt
);