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 if (skb
->nf_debug
!= ((1<<NF_IP_PRE_ROUTING
)
222 | (1<<NF_IP_LOCAL_IN
))) {
223 printk("ip_local_deliver: bad skb: ");
224 debug_print_hooks_ip(skb
->nf_debug
);
225 nf_dump_skb(PF_INET
, skb
);
230 void nf_debug_ip_loopback_xmit(struct sk_buff
*newskb
)
232 if (newskb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
233 | (1 << NF_IP_POST_ROUTING
))) {
234 printk("ip_dev_loopback_xmit: bad owned skb = %p: ",
236 debug_print_hooks_ip(newskb
->nf_debug
);
237 nf_dump_skb(PF_INET
, newskb
);
241 void nf_debug_ip_finish_output2(struct sk_buff
*skb
)
243 /* If it's owned, it must have gone through the
244 * NF_IP_LOCAL_OUT and NF_IP_POST_ROUTING.
245 * Otherwise, must have gone through
246 * NF_IP_PRE_ROUTING, NF_IP_FORWARD and NF_IP_POST_ROUTING.
249 if (skb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
250 | (1 << NF_IP_POST_ROUTING
))) {
251 printk("ip_finish_output: bad owned skb = %p: ", skb
);
252 debug_print_hooks_ip(skb
->nf_debug
);
253 nf_dump_skb(PF_INET
, skb
);
256 if (skb
->nf_debug
!= ((1 << NF_IP_PRE_ROUTING
)
257 | (1 << NF_IP_FORWARD
)
258 | (1 << NF_IP_POST_ROUTING
))) {
259 /* Fragments, entunnelled packets, TCP RSTs
260 generated by ipt_REJECT will have no
261 owners, but still may be local */
262 if (skb
->nf_debug
!= ((1 << NF_IP_LOCAL_OUT
)
263 | (1 << NF_IP_POST_ROUTING
))){
264 printk("ip_finish_output:"
265 " bad unowned skb = %p: ",skb
);
266 debug_print_hooks_ip(skb
->nf_debug
);
267 nf_dump_skb(PF_INET
, skb
);
272 #endif /*CONFIG_NETFILTER_DEBUG*/
274 /* Call get/setsockopt() */
275 static int nf_sockopt(struct sock
*sk
, int pf
, int val
,
276 char __user
*opt
, int *len
, int get
)
279 struct nf_sockopt_ops
*ops
;
282 if (down_interruptible(&nf_sockopt_mutex
) != 0)
285 list_for_each(i
, &nf_sockopts
) {
286 ops
= (struct nf_sockopt_ops
*)i
;
289 if (val
>= ops
->get_optmin
290 && val
< ops
->get_optmax
) {
292 up(&nf_sockopt_mutex
);
293 ret
= ops
->get(sk
, val
, opt
, len
);
297 if (val
>= ops
->set_optmin
298 && val
< ops
->set_optmax
) {
300 up(&nf_sockopt_mutex
);
301 ret
= ops
->set(sk
, val
, opt
, *len
);
307 up(&nf_sockopt_mutex
);
311 down(&nf_sockopt_mutex
);
313 if (ops
->cleanup_task
)
314 wake_up_process(ops
->cleanup_task
);
315 up(&nf_sockopt_mutex
);
319 int nf_setsockopt(struct sock
*sk
, int pf
, int val
, char __user
*opt
,
322 return nf_sockopt(sk
, pf
, val
, opt
, &len
, 0);
325 int nf_getsockopt(struct sock
*sk
, int pf
, int val
, char __user
*opt
, int *len
)
327 return nf_sockopt(sk
, pf
, val
, opt
, len
, 1);
330 static unsigned int nf_iterate(struct list_head
*head
,
331 struct sk_buff
**skb
,
333 const struct net_device
*indev
,
334 const struct net_device
*outdev
,
335 struct list_head
**i
,
336 int (*okfn
)(struct sk_buff
*),
339 unsigned int verdict
;
342 * The caller must not block between calls to this
343 * function because of risk of continuing from deleted element.
345 list_for_each_continue_rcu(*i
, head
) {
346 struct nf_hook_ops
*elem
= (struct nf_hook_ops
*)*i
;
348 if (hook_thresh
> elem
->priority
)
351 /* Optimization: we don't need to hold module
352 reference here, since function can't sleep. --RR */
353 verdict
= elem
->hook(hook
, skb
, indev
, outdev
, okfn
);
354 if (verdict
!= NF_ACCEPT
) {
355 #ifdef CONFIG_NETFILTER_DEBUG
356 if (unlikely(verdict
> NF_MAX_VERDICT
)) {
357 NFDEBUG("Evil return from %p(%u).\n",
362 if (verdict
!= NF_REPEAT
)
370 int nf_register_queue_handler(int pf
, nf_queue_outfn_t outfn
, void *data
)
374 write_lock_bh(&queue_handler_lock
);
375 if (queue_handler
[pf
].outfn
)
378 queue_handler
[pf
].outfn
= outfn
;
379 queue_handler
[pf
].data
= data
;
382 write_unlock_bh(&queue_handler_lock
);
387 /* The caller must flush their queue before this */
388 int nf_unregister_queue_handler(int pf
)
390 write_lock_bh(&queue_handler_lock
);
391 queue_handler
[pf
].outfn
= NULL
;
392 queue_handler
[pf
].data
= NULL
;
393 write_unlock_bh(&queue_handler_lock
);
399 * Any packet that leaves via this function must come back
400 * through nf_reinject().
402 static int nf_queue(struct sk_buff
*skb
,
403 struct list_head
*elem
,
404 int pf
, unsigned int hook
,
405 struct net_device
*indev
,
406 struct net_device
*outdev
,
407 int (*okfn
)(struct sk_buff
*))
410 struct nf_info
*info
;
411 #ifdef CONFIG_BRIDGE_NETFILTER
412 struct net_device
*physindev
= NULL
;
413 struct net_device
*physoutdev
= NULL
;
416 /* QUEUE == DROP if noone is waiting, to be safe. */
417 read_lock(&queue_handler_lock
);
418 if (!queue_handler
[pf
].outfn
) {
419 read_unlock(&queue_handler_lock
);
424 info
= kmalloc(sizeof(*info
), GFP_ATOMIC
);
427 printk(KERN_ERR
"OOM queueing packet %p\n",
429 read_unlock(&queue_handler_lock
);
434 *info
= (struct nf_info
) {
435 (struct nf_hook_ops
*)elem
, pf
, hook
, indev
, outdev
, okfn
};
437 /* If it's going away, ignore hook. */
438 if (!try_module_get(info
->elem
->owner
)) {
439 read_unlock(&queue_handler_lock
);
444 /* Bump dev refs so they don't vanish while packet is out */
445 if (indev
) dev_hold(indev
);
446 if (outdev
) dev_hold(outdev
);
448 #ifdef CONFIG_BRIDGE_NETFILTER
449 if (skb
->nf_bridge
) {
450 physindev
= skb
->nf_bridge
->physindev
;
451 if (physindev
) dev_hold(physindev
);
452 physoutdev
= skb
->nf_bridge
->physoutdev
;
453 if (physoutdev
) dev_hold(physoutdev
);
457 status
= queue_handler
[pf
].outfn(skb
, info
, queue_handler
[pf
].data
);
458 read_unlock(&queue_handler_lock
);
461 /* James M doesn't say fuck enough. */
462 if (indev
) dev_put(indev
);
463 if (outdev
) dev_put(outdev
);
464 #ifdef CONFIG_BRIDGE_NETFILTER
465 if (physindev
) dev_put(physindev
);
466 if (physoutdev
) dev_put(physoutdev
);
468 module_put(info
->elem
->owner
);
476 /* Returns 1 if okfn() needs to be executed by the caller,
477 * -EPERM for NF_DROP, 0 otherwise. */
478 int nf_hook_slow(int pf
, unsigned int hook
, struct sk_buff
**pskb
,
479 struct net_device
*indev
,
480 struct net_device
*outdev
,
481 int (*okfn
)(struct sk_buff
*),
484 struct list_head
*elem
;
485 unsigned int verdict
;
488 /* We may already have this, but read-locks nest anyway */
491 #ifdef CONFIG_NETFILTER_DEBUG
492 if (unlikely((*pskb
)->nf_debug
& (1 << hook
))) {
493 printk("nf_hook: hook %i already set.\n", hook
);
494 nf_dump_skb(pf
, *pskb
);
496 (*pskb
)->nf_debug
|= (1 << hook
);
499 elem
= &nf_hooks
[pf
][hook
];
501 verdict
= nf_iterate(&nf_hooks
[pf
][hook
], pskb
, hook
, indev
,
502 outdev
, &elem
, okfn
, hook_thresh
);
503 if (verdict
== NF_ACCEPT
|| verdict
== NF_STOP
) {
506 } else if (verdict
== NF_DROP
) {
509 } else if (verdict
== NF_QUEUE
) {
510 NFDEBUG("nf_hook: Verdict = QUEUE.\n");
511 if (!nf_queue(*pskb
, elem
, pf
, hook
, indev
, outdev
, okfn
))
519 void nf_reinject(struct sk_buff
*skb
, struct nf_info
*info
,
520 unsigned int verdict
)
522 struct list_head
*elem
= &info
->elem
->list
;
527 /* Release those devices we held, or Alexey will kill me. */
528 if (info
->indev
) dev_put(info
->indev
);
529 if (info
->outdev
) dev_put(info
->outdev
);
530 #ifdef CONFIG_BRIDGE_NETFILTER
531 if (skb
->nf_bridge
) {
532 if (skb
->nf_bridge
->physindev
)
533 dev_put(skb
->nf_bridge
->physindev
);
534 if (skb
->nf_bridge
->physoutdev
)
535 dev_put(skb
->nf_bridge
->physoutdev
);
539 /* Drop reference to owner of hook which queued us. */
540 module_put(info
->elem
->owner
);
542 list_for_each_rcu(i
, &nf_hooks
[info
->pf
][info
->hook
]) {
547 if (elem
== &nf_hooks
[info
->pf
][info
->hook
]) {
548 /* The module which sent it to userspace is gone. */
549 NFDEBUG("%s: module disappeared, dropping packet.\n",
554 /* Continue traversal iff userspace said ok... */
555 if (verdict
== NF_REPEAT
) {
560 if (verdict
== NF_ACCEPT
) {
562 verdict
= nf_iterate(&nf_hooks
[info
->pf
][info
->hook
],
564 info
->indev
, info
->outdev
, &elem
,
565 info
->okfn
, INT_MIN
);
574 if (!nf_queue(skb
, elem
, info
->pf
, info
->hook
,
575 info
->indev
, info
->outdev
, info
->okfn
))
581 if (verdict
== NF_DROP
)
589 /* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
590 int ip_route_me_harder(struct sk_buff
**pskb
)
592 struct iphdr
*iph
= (*pskb
)->nh
.iph
;
594 struct flowi fl
= {};
595 struct dst_entry
*odst
;
598 /* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
599 * packets with foreign saddr to appear on the NF_IP_LOCAL_OUT hook.
601 if (inet_addr_type(iph
->saddr
) == RTN_LOCAL
) {
602 fl
.nl_u
.ip4_u
.daddr
= iph
->daddr
;
603 fl
.nl_u
.ip4_u
.saddr
= iph
->saddr
;
604 fl
.nl_u
.ip4_u
.tos
= RT_TOS(iph
->tos
);
605 fl
.oif
= (*pskb
)->sk
? (*pskb
)->sk
->sk_bound_dev_if
: 0;
606 #ifdef CONFIG_IP_ROUTE_FWMARK
607 fl
.nl_u
.ip4_u
.fwmark
= (*pskb
)->nfmark
;
609 fl
.proto
= iph
->protocol
;
610 if (ip_route_output_key(&rt
, &fl
) != 0)
613 /* Drop old route. */
614 dst_release((*pskb
)->dst
);
615 (*pskb
)->dst
= &rt
->u
.dst
;
617 /* non-local src, find valid iif to satisfy
618 * rp-filter when calling ip_route_input. */
619 fl
.nl_u
.ip4_u
.daddr
= iph
->saddr
;
620 if (ip_route_output_key(&rt
, &fl
) != 0)
624 if (ip_route_input(*pskb
, iph
->daddr
, iph
->saddr
,
625 RT_TOS(iph
->tos
), rt
->u
.dst
.dev
) != 0) {
626 dst_release(&rt
->u
.dst
);
629 dst_release(&rt
->u
.dst
);
633 if ((*pskb
)->dst
->error
)
636 /* Change in oif may mean change in hh_len. */
637 hh_len
= (*pskb
)->dst
->dev
->hard_header_len
;
638 if (skb_headroom(*pskb
) < hh_len
) {
639 struct sk_buff
*nskb
;
641 nskb
= skb_realloc_headroom(*pskb
, hh_len
);
645 skb_set_owner_w(nskb
, (*pskb
)->sk
);
652 EXPORT_SYMBOL(ip_route_me_harder
);
654 int skb_ip_make_writable(struct sk_buff
**pskb
, unsigned int writable_len
)
656 struct sk_buff
*nskb
;
658 if (writable_len
> (*pskb
)->len
)
661 /* Not exclusive use of packet? Must copy. */
662 if (skb_shared(*pskb
) || skb_cloned(*pskb
))
665 return pskb_may_pull(*pskb
, writable_len
);
668 nskb
= skb_copy(*pskb
, GFP_ATOMIC
);
671 BUG_ON(skb_is_nonlinear(nskb
));
673 /* Rest of kernel will get very unhappy if we pass it a
674 suddenly-orphaned skbuff */
676 skb_set_owner_w(nskb
, (*pskb
)->sk
);
681 EXPORT_SYMBOL(skb_ip_make_writable
);
682 #endif /*CONFIG_INET*/
684 /* Internal logging interface, which relies on the real
685 LOG target modules */
687 #define NF_LOG_PREFIXLEN 128
689 static nf_logfn
*nf_logging
[NPROTO
]; /* = NULL */
690 static int reported
= 0;
691 static DEFINE_SPINLOCK(nf_log_lock
);
693 int nf_log_register(int pf
, nf_logfn
*logfn
)
697 /* Any setup of logging members must be done before
698 * substituting pointer. */
699 spin_lock(&nf_log_lock
);
700 if (!nf_logging
[pf
]) {
701 rcu_assign_pointer(nf_logging
[pf
], logfn
);
704 spin_unlock(&nf_log_lock
);
708 void nf_log_unregister(int pf
, nf_logfn
*logfn
)
710 spin_lock(&nf_log_lock
);
711 if (nf_logging
[pf
] == logfn
)
712 nf_logging
[pf
] = NULL
;
713 spin_unlock(&nf_log_lock
);
715 /* Give time to concurrent readers. */
719 void nf_log_packet(int pf
,
720 unsigned int hooknum
,
721 const struct sk_buff
*skb
,
722 const struct net_device
*in
,
723 const struct net_device
*out
,
724 const char *fmt
, ...)
727 char prefix
[NF_LOG_PREFIXLEN
];
731 logfn
= rcu_dereference(nf_logging
[pf
]);
734 vsnprintf(prefix
, sizeof(prefix
), fmt
, args
);
736 /* We must read logging before nf_logfn[pf] */
737 logfn(hooknum
, skb
, in
, out
, prefix
);
738 } else if (!reported
) {
739 printk(KERN_WARNING
"nf_log_packet: can\'t log yet, "
740 "no backend logging module loaded in!\n");
745 EXPORT_SYMBOL(nf_log_register
);
746 EXPORT_SYMBOL(nf_log_unregister
);
747 EXPORT_SYMBOL(nf_log_packet
);
749 /* This does not belong here, but locally generated errors need it if connection
750 tracking in use: without this, connection may not be in hash table, and hence
751 manufactured ICMP or RST packets will not be associated with it. */
752 void (*ip_ct_attach
)(struct sk_buff
*, struct sk_buff
*);
754 void nf_ct_attach(struct sk_buff
*new, struct sk_buff
*skb
)
756 void (*attach
)(struct sk_buff
*, struct sk_buff
*);
758 if (skb
->nfct
&& (attach
= ip_ct_attach
) != NULL
) {
759 mb(); /* Just to be sure: must be read before executing this */
764 void __init
netfilter_init(void)
768 for (i
= 0; i
< NPROTO
; i
++) {
769 for (h
= 0; h
< NF_MAX_HOOKS
; h
++)
770 INIT_LIST_HEAD(&nf_hooks
[i
][h
]);
774 EXPORT_SYMBOL(ip_ct_attach
);
775 EXPORT_SYMBOL(nf_ct_attach
);
776 EXPORT_SYMBOL(nf_getsockopt
);
777 EXPORT_SYMBOL(nf_hook_slow
);
778 EXPORT_SYMBOL(nf_hooks
);
779 EXPORT_SYMBOL(nf_register_hook
);
780 EXPORT_SYMBOL(nf_register_queue_handler
);
781 EXPORT_SYMBOL(nf_register_sockopt
);
782 EXPORT_SYMBOL(nf_reinject
);
783 EXPORT_SYMBOL(nf_setsockopt
);
784 EXPORT_SYMBOL(nf_unregister_hook
);
785 EXPORT_SYMBOL(nf_unregister_queue_handler
);
786 EXPORT_SYMBOL(nf_unregister_sockopt
);