2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #include <linux/module.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/proc_fs.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter_bridge.h>
29 #include <linux/netfilter/nfnetlink.h>
30 #include <linux/netfilter/nfnetlink_queue.h>
31 #include <linux/netfilter/nf_conntrack_common.h>
32 #include <linux/list.h>
34 #include <net/tcp_states.h>
35 #include <net/netfilter/nf_queue.h>
36 #include <net/netns/generic.h>
38 #include <linux/atomic.h>
40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41 #include "../bridge/br_private.h"
44 #define NFQNL_QMAX_DEFAULT 1024
46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
47 * includes the header length. Thus, the maximum packet length that we
48 * support is 65531 bytes. We send truncated packets if the specified length
49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
50 * attribute to detect truncation.
52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
54 struct nfqnl_instance
{
55 struct hlist_node hlist
; /* global list of queues */
59 unsigned int queue_maxlen
;
60 unsigned int copy_range
;
61 unsigned int queue_dropped
;
62 unsigned int queue_user_dropped
;
65 u_int16_t queue_num
; /* number of this queue */
67 u_int32_t flags
; /* Set using NFQA_CFG_FLAGS */
69 * Following fields are dirtied for each queued packet,
70 * keep them in same cache line if possible.
72 spinlock_t lock ____cacheline_aligned_in_smp
;
73 unsigned int queue_total
;
74 unsigned int id_sequence
; /* 'sequence' of pkt ids */
75 struct list_head queue_list
; /* packets in queue */
78 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
80 static unsigned int nfnl_queue_net_id __read_mostly
;
82 #define INSTANCE_BUCKETS 16
83 struct nfnl_queue_net
{
84 spinlock_t instances_lock
;
85 struct hlist_head instance_table
[INSTANCE_BUCKETS
];
88 static struct nfnl_queue_net
*nfnl_queue_pernet(struct net
*net
)
90 return net_generic(net
, nfnl_queue_net_id
);
93 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
95 return ((queue_num
>> 8) ^ queue_num
) % INSTANCE_BUCKETS
;
98 static struct nfqnl_instance
*
99 instance_lookup(struct nfnl_queue_net
*q
, u_int16_t queue_num
)
101 struct hlist_head
*head
;
102 struct nfqnl_instance
*inst
;
104 head
= &q
->instance_table
[instance_hashfn(queue_num
)];
105 hlist_for_each_entry_rcu(inst
, head
, hlist
) {
106 if (inst
->queue_num
== queue_num
)
112 static struct nfqnl_instance
*
113 instance_create(struct nfnl_queue_net
*q
, u_int16_t queue_num
, u32 portid
)
115 struct nfqnl_instance
*inst
;
119 spin_lock(&q
->instances_lock
);
120 if (instance_lookup(q
, queue_num
)) {
125 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
131 inst
->queue_num
= queue_num
;
132 inst
->peer_portid
= portid
;
133 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
134 inst
->copy_range
= NFQNL_MAX_COPY_RANGE
;
135 inst
->copy_mode
= NFQNL_COPY_NONE
;
136 spin_lock_init(&inst
->lock
);
137 INIT_LIST_HEAD(&inst
->queue_list
);
139 if (!try_module_get(THIS_MODULE
)) {
144 h
= instance_hashfn(queue_num
);
145 hlist_add_head_rcu(&inst
->hlist
, &q
->instance_table
[h
]);
147 spin_unlock(&q
->instances_lock
);
154 spin_unlock(&q
->instances_lock
);
158 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
162 instance_destroy_rcu(struct rcu_head
*head
)
164 struct nfqnl_instance
*inst
= container_of(head
, struct nfqnl_instance
,
167 nfqnl_flush(inst
, NULL
, 0);
169 module_put(THIS_MODULE
);
173 __instance_destroy(struct nfqnl_instance
*inst
)
175 hlist_del_rcu(&inst
->hlist
);
176 call_rcu(&inst
->rcu
, instance_destroy_rcu
);
180 instance_destroy(struct nfnl_queue_net
*q
, struct nfqnl_instance
*inst
)
182 spin_lock(&q
->instances_lock
);
183 __instance_destroy(inst
);
184 spin_unlock(&q
->instances_lock
);
188 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
190 list_add_tail(&entry
->list
, &queue
->queue_list
);
191 queue
->queue_total
++;
195 __dequeue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
197 list_del(&entry
->list
);
198 queue
->queue_total
--;
201 static struct nf_queue_entry
*
202 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
204 struct nf_queue_entry
*entry
= NULL
, *i
;
206 spin_lock_bh(&queue
->lock
);
208 list_for_each_entry(i
, &queue
->queue_list
, list
) {
216 __dequeue_entry(queue
, entry
);
218 spin_unlock_bh(&queue
->lock
);
224 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
226 struct nf_queue_entry
*entry
, *next
;
228 spin_lock_bh(&queue
->lock
);
229 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
230 if (!cmpfn
|| cmpfn(entry
, data
)) {
231 list_del(&entry
->list
);
232 queue
->queue_total
--;
233 nf_reinject(entry
, NF_DROP
);
236 spin_unlock_bh(&queue
->lock
);
240 nfqnl_put_packet_info(struct sk_buff
*nlskb
, struct sk_buff
*packet
,
245 if (packet
->ip_summed
== CHECKSUM_PARTIAL
)
246 flags
= NFQA_SKB_CSUMNOTREADY
;
247 else if (csum_verify
)
248 flags
= NFQA_SKB_CSUM_NOTVERIFIED
;
250 if (skb_is_gso(packet
))
251 flags
|= NFQA_SKB_GSO
;
253 return flags
? nla_put_be32(nlskb
, NFQA_SKB_INFO
, htonl(flags
)) : 0;
256 static int nfqnl_put_sk_uidgid(struct sk_buff
*skb
, struct sock
*sk
)
258 const struct cred
*cred
;
260 if (!sk_fullsock(sk
))
263 read_lock_bh(&sk
->sk_callback_lock
);
264 if (sk
->sk_socket
&& sk
->sk_socket
->file
) {
265 cred
= sk
->sk_socket
->file
->f_cred
;
266 if (nla_put_be32(skb
, NFQA_UID
,
267 htonl(from_kuid_munged(&init_user_ns
, cred
->fsuid
))))
268 goto nla_put_failure
;
269 if (nla_put_be32(skb
, NFQA_GID
,
270 htonl(from_kgid_munged(&init_user_ns
, cred
->fsgid
))))
271 goto nla_put_failure
;
273 read_unlock_bh(&sk
->sk_callback_lock
);
277 read_unlock_bh(&sk
->sk_callback_lock
);
281 static u32
nfqnl_get_sk_secctx(struct sk_buff
*skb
, char **secdata
)
284 #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
285 if (!skb
|| !sk_fullsock(skb
->sk
))
288 read_lock_bh(&skb
->sk
->sk_callback_lock
);
291 security_secid_to_secctx(skb
->secmark
, secdata
, &seclen
);
293 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
298 static u32
nfqnl_get_bridge_size(struct nf_queue_entry
*entry
)
300 struct sk_buff
*entskb
= entry
->skb
;
303 if (entry
->state
.pf
!= PF_BRIDGE
|| !skb_mac_header_was_set(entskb
))
306 if (skb_vlan_tag_present(entskb
))
307 nlalen
+= nla_total_size(nla_total_size(sizeof(__be16
)) +
308 nla_total_size(sizeof(__be16
)));
310 if (entskb
->network_header
> entskb
->mac_header
)
311 nlalen
+= nla_total_size((entskb
->network_header
-
312 entskb
->mac_header
));
317 static int nfqnl_put_bridge(struct nf_queue_entry
*entry
, struct sk_buff
*skb
)
319 struct sk_buff
*entskb
= entry
->skb
;
321 if (entry
->state
.pf
!= PF_BRIDGE
|| !skb_mac_header_was_set(entskb
))
324 if (skb_vlan_tag_present(entskb
)) {
327 nest
= nla_nest_start(skb
, NFQA_VLAN
| NLA_F_NESTED
);
329 goto nla_put_failure
;
331 if (nla_put_be16(skb
, NFQA_VLAN_TCI
, htons(entskb
->vlan_tci
)) ||
332 nla_put_be16(skb
, NFQA_VLAN_PROTO
, entskb
->vlan_proto
))
333 goto nla_put_failure
;
335 nla_nest_end(skb
, nest
);
338 if (entskb
->mac_header
< entskb
->network_header
) {
339 int len
= (int)(entskb
->network_header
- entskb
->mac_header
);
341 if (nla_put(skb
, NFQA_L2HDR
, len
, skb_mac_header(entskb
)))
342 goto nla_put_failure
;
351 static struct sk_buff
*
352 nfqnl_build_packet_message(struct net
*net
, struct nfqnl_instance
*queue
,
353 struct nf_queue_entry
*entry
,
354 __be32
**packet_id_ptr
)
357 size_t data_len
= 0, cap_len
= 0;
358 unsigned int hlen
= 0;
361 struct nfqnl_msg_packet_hdr
*pmsg
;
362 struct nlmsghdr
*nlh
;
363 struct nfgenmsg
*nfmsg
;
364 struct sk_buff
*entskb
= entry
->skb
;
365 struct net_device
*indev
;
366 struct net_device
*outdev
;
367 struct nf_conn
*ct
= NULL
;
368 enum ip_conntrack_info
uninitialized_var(ctinfo
);
369 struct nfnl_ct_hook
*nfnl_ct
;
371 char *secdata
= NULL
;
374 size
= nlmsg_total_size(sizeof(struct nfgenmsg
))
375 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
376 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
377 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
378 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
379 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
380 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
382 + nla_total_size(sizeof(u_int32_t
)) /* mark */
383 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
384 + nla_total_size(sizeof(u_int32_t
)) /* skbinfo */
385 + nla_total_size(sizeof(u_int32_t
)); /* cap_len */
388 size
+= nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
));
390 size
+= nfqnl_get_bridge_size(entry
);
392 if (entry
->state
.hook
<= NF_INET_FORWARD
||
393 (entry
->state
.hook
== NF_INET_POST_ROUTING
&& entskb
->sk
== NULL
))
394 csum_verify
= !skb_csum_unnecessary(entskb
);
398 outdev
= entry
->state
.out
;
400 switch ((enum nfqnl_config_mode
)ACCESS_ONCE(queue
->copy_mode
)) {
401 case NFQNL_COPY_META
:
402 case NFQNL_COPY_NONE
:
405 case NFQNL_COPY_PACKET
:
406 if (!(queue
->flags
& NFQA_CFG_F_GSO
) &&
407 entskb
->ip_summed
== CHECKSUM_PARTIAL
&&
408 skb_checksum_help(entskb
))
411 data_len
= ACCESS_ONCE(queue
->copy_range
);
412 if (data_len
> entskb
->len
)
413 data_len
= entskb
->len
;
415 hlen
= skb_zerocopy_headlen(entskb
);
416 hlen
= min_t(unsigned int, hlen
, data_len
);
417 size
+= sizeof(struct nlattr
) + hlen
;
418 cap_len
= entskb
->len
;
422 nfnl_ct
= rcu_dereference(nfnl_ct_hook
);
424 if (queue
->flags
& NFQA_CFG_F_CONNTRACK
) {
425 if (nfnl_ct
!= NULL
) {
426 ct
= nfnl_ct
->get_ct(entskb
, &ctinfo
);
428 size
+= nfnl_ct
->build_size(ct
);
432 if (queue
->flags
& NFQA_CFG_F_UID_GID
) {
433 size
+= (nla_total_size(sizeof(u_int32_t
)) /* uid */
434 + nla_total_size(sizeof(u_int32_t
))); /* gid */
437 if ((queue
->flags
& NFQA_CFG_F_SECCTX
) && entskb
->sk
) {
438 seclen
= nfqnl_get_sk_secctx(entskb
, &secdata
);
440 size
+= nla_total_size(seclen
);
443 skb
= alloc_skb(size
, GFP_ATOMIC
);
445 skb_tx_error(entskb
);
449 nlh
= nlmsg_put(skb
, 0, 0,
450 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
451 sizeof(struct nfgenmsg
), 0);
453 skb_tx_error(entskb
);
457 nfmsg
= nlmsg_data(nlh
);
458 nfmsg
->nfgen_family
= entry
->state
.pf
;
459 nfmsg
->version
= NFNETLINK_V0
;
460 nfmsg
->res_id
= htons(queue
->queue_num
);
462 nla
= __nla_reserve(skb
, NFQA_PACKET_HDR
, sizeof(*pmsg
));
463 pmsg
= nla_data(nla
);
464 pmsg
->hw_protocol
= entskb
->protocol
;
465 pmsg
->hook
= entry
->state
.hook
;
466 *packet_id_ptr
= &pmsg
->packet_id
;
468 indev
= entry
->state
.in
;
470 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
471 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
, htonl(indev
->ifindex
)))
472 goto nla_put_failure
;
474 if (entry
->state
.pf
== PF_BRIDGE
) {
475 /* Case 1: indev is physical input device, we need to
476 * look for bridge group (when called from
477 * netfilter_bridge) */
478 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
479 htonl(indev
->ifindex
)) ||
480 /* this is the bridge group "brX" */
481 /* rcu_read_lock()ed by __nf_queue */
482 nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
483 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
484 goto nla_put_failure
;
488 /* Case 2: indev is bridge group, we need to look for
489 * physical device (when called from ipv4) */
490 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
491 htonl(indev
->ifindex
)))
492 goto nla_put_failure
;
494 physinif
= nf_bridge_get_physinif(entskb
);
496 nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
498 goto nla_put_failure
;
504 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
505 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
, htonl(outdev
->ifindex
)))
506 goto nla_put_failure
;
508 if (entry
->state
.pf
== PF_BRIDGE
) {
509 /* Case 1: outdev is physical output device, we need to
510 * look for bridge group (when called from
511 * netfilter_bridge) */
512 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
513 htonl(outdev
->ifindex
)) ||
514 /* this is the bridge group "brX" */
515 /* rcu_read_lock()ed by __nf_queue */
516 nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
517 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
518 goto nla_put_failure
;
522 /* Case 2: outdev is bridge group, we need to look for
523 * physical output device (when called from ipv4) */
524 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
525 htonl(outdev
->ifindex
)))
526 goto nla_put_failure
;
528 physoutif
= nf_bridge_get_physoutif(entskb
);
530 nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
532 goto nla_put_failure
;
538 nla_put_be32(skb
, NFQA_MARK
, htonl(entskb
->mark
)))
539 goto nla_put_failure
;
541 if (indev
&& entskb
->dev
&&
542 entskb
->mac_header
!= entskb
->network_header
) {
543 struct nfqnl_msg_packet_hw phw
;
546 memset(&phw
, 0, sizeof(phw
));
547 len
= dev_parse_header(entskb
, phw
.hw_addr
);
549 phw
.hw_addrlen
= htons(len
);
550 if (nla_put(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
))
551 goto nla_put_failure
;
555 if (nfqnl_put_bridge(entry
, skb
) < 0)
556 goto nla_put_failure
;
558 if (entskb
->tstamp
) {
559 struct nfqnl_msg_packet_timestamp ts
;
560 struct timespec64 kts
= ktime_to_timespec64(entskb
->tstamp
);
562 ts
.sec
= cpu_to_be64(kts
.tv_sec
);
563 ts
.usec
= cpu_to_be64(kts
.tv_nsec
/ NSEC_PER_USEC
);
565 if (nla_put(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
))
566 goto nla_put_failure
;
569 if ((queue
->flags
& NFQA_CFG_F_UID_GID
) && entskb
->sk
&&
570 nfqnl_put_sk_uidgid(skb
, entskb
->sk
) < 0)
571 goto nla_put_failure
;
573 if (seclen
&& nla_put(skb
, NFQA_SECCTX
, seclen
, secdata
))
574 goto nla_put_failure
;
576 if (ct
&& nfnl_ct
->build(skb
, ct
, ctinfo
, NFQA_CT
, NFQA_CT_INFO
) < 0)
577 goto nla_put_failure
;
579 if (cap_len
> data_len
&&
580 nla_put_be32(skb
, NFQA_CAP_LEN
, htonl(cap_len
)))
581 goto nla_put_failure
;
583 if (nfqnl_put_packet_info(skb
, entskb
, csum_verify
))
584 goto nla_put_failure
;
589 if (skb_tailroom(skb
) < sizeof(*nla
) + hlen
)
590 goto nla_put_failure
;
592 nla
= (struct nlattr
*)skb_put(skb
, sizeof(*nla
));
593 nla
->nla_type
= NFQA_PAYLOAD
;
594 nla
->nla_len
= nla_attr_size(data_len
);
596 if (skb_zerocopy(skb
, entskb
, data_len
, hlen
))
597 goto nla_put_failure
;
600 nlh
->nlmsg_len
= skb
->len
;
602 security_release_secctx(secdata
, seclen
);
606 skb_tx_error(entskb
);
608 net_err_ratelimited("nf_queue: error creating packet message\n");
611 security_release_secctx(secdata
, seclen
);
616 __nfqnl_enqueue_packet(struct net
*net
, struct nfqnl_instance
*queue
,
617 struct nf_queue_entry
*entry
)
619 struct sk_buff
*nskb
;
621 __be32
*packet_id_ptr
;
624 nskb
= nfqnl_build_packet_message(net
, queue
, entry
, &packet_id_ptr
);
629 spin_lock_bh(&queue
->lock
);
631 if (queue
->queue_total
>= queue
->queue_maxlen
) {
632 if (queue
->flags
& NFQA_CFG_F_FAIL_OPEN
) {
636 queue
->queue_dropped
++;
637 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
640 goto err_out_free_nskb
;
642 entry
->id
= ++queue
->id_sequence
;
643 *packet_id_ptr
= htonl(entry
->id
);
645 /* nfnetlink_unicast will either free the nskb or add it to a socket */
646 err
= nfnetlink_unicast(nskb
, net
, queue
->peer_portid
, MSG_DONTWAIT
);
648 if (queue
->flags
& NFQA_CFG_F_FAIL_OPEN
) {
652 queue
->queue_user_dropped
++;
657 __enqueue_entry(queue
, entry
);
659 spin_unlock_bh(&queue
->lock
);
665 spin_unlock_bh(&queue
->lock
);
667 nf_reinject(entry
, NF_ACCEPT
);
672 static struct nf_queue_entry
*
673 nf_queue_entry_dup(struct nf_queue_entry
*e
)
675 struct nf_queue_entry
*entry
= kmemdup(e
, e
->size
, GFP_ATOMIC
);
677 nf_queue_entry_get_refs(entry
);
681 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
682 /* When called from bridge netfilter, skb->data must point to MAC header
683 * before calling skb_gso_segment(). Else, original MAC header is lost
684 * and segmented skbs will be sent to wrong destination.
686 static void nf_bridge_adjust_skb_data(struct sk_buff
*skb
)
689 __skb_push(skb
, skb
->network_header
- skb
->mac_header
);
692 static void nf_bridge_adjust_segmented_data(struct sk_buff
*skb
)
695 __skb_pull(skb
, skb
->network_header
- skb
->mac_header
);
698 #define nf_bridge_adjust_skb_data(s) do {} while (0)
699 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
702 static void free_entry(struct nf_queue_entry
*entry
)
704 nf_queue_entry_release_refs(entry
);
709 __nfqnl_enqueue_packet_gso(struct net
*net
, struct nfqnl_instance
*queue
,
710 struct sk_buff
*skb
, struct nf_queue_entry
*entry
)
713 struct nf_queue_entry
*entry_seg
;
715 nf_bridge_adjust_segmented_data(skb
);
717 if (skb
->next
== NULL
) { /* last packet, no need to copy entry */
718 struct sk_buff
*gso_skb
= entry
->skb
;
720 ret
= __nfqnl_enqueue_packet(net
, queue
, entry
);
722 entry
->skb
= gso_skb
;
728 entry_seg
= nf_queue_entry_dup(entry
);
730 entry_seg
->skb
= skb
;
731 ret
= __nfqnl_enqueue_packet(net
, queue
, entry_seg
);
733 free_entry(entry_seg
);
739 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
742 struct nfqnl_instance
*queue
;
743 struct sk_buff
*skb
, *segs
;
745 struct net
*net
= entry
->state
.net
;
746 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
748 /* rcu_read_lock()ed by nf_hook_thresh */
749 queue
= instance_lookup(q
, queuenum
);
753 if (queue
->copy_mode
== NFQNL_COPY_NONE
)
758 switch (entry
->state
.pf
) {
760 skb
->protocol
= htons(ETH_P_IP
);
763 skb
->protocol
= htons(ETH_P_IPV6
);
767 if ((queue
->flags
& NFQA_CFG_F_GSO
) || !skb_is_gso(skb
))
768 return __nfqnl_enqueue_packet(net
, queue
, entry
);
770 nf_bridge_adjust_skb_data(skb
);
771 segs
= skb_gso_segment(skb
, 0);
772 /* Does not use PTR_ERR to limit the number of error codes that can be
773 * returned by nf_queue. For instance, callers rely on -ESRCH to
774 * mean 'ignore this hook'.
776 if (IS_ERR_OR_NULL(segs
))
781 struct sk_buff
*nskb
= segs
->next
;
783 err
= __nfqnl_enqueue_packet_gso(net
, queue
,
793 if (err
) /* some segments are already queued */
799 nf_bridge_adjust_segmented_data(skb
);
804 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
, int diff
)
806 struct sk_buff
*nskb
;
809 if (pskb_trim(e
->skb
, data_len
))
811 } else if (diff
> 0) {
812 if (data_len
> 0xFFFF)
814 if (diff
> skb_tailroom(e
->skb
)) {
815 nskb
= skb_copy_expand(e
->skb
, skb_headroom(e
->skb
),
818 printk(KERN_WARNING
"nf_queue: OOM "
819 "in mangle, dropping packet\n");
825 skb_put(e
->skb
, diff
);
827 if (!skb_make_writable(e
->skb
, data_len
))
829 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
830 e
->skb
->ip_summed
= CHECKSUM_NONE
;
835 nfqnl_set_mode(struct nfqnl_instance
*queue
,
836 unsigned char mode
, unsigned int range
)
840 spin_lock_bh(&queue
->lock
);
842 case NFQNL_COPY_NONE
:
843 case NFQNL_COPY_META
:
844 queue
->copy_mode
= mode
;
845 queue
->copy_range
= 0;
848 case NFQNL_COPY_PACKET
:
849 queue
->copy_mode
= mode
;
850 if (range
== 0 || range
> NFQNL_MAX_COPY_RANGE
)
851 queue
->copy_range
= NFQNL_MAX_COPY_RANGE
;
853 queue
->copy_range
= range
;
860 spin_unlock_bh(&queue
->lock
);
866 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
869 if (entry
->state
.in
->ifindex
== ifindex
)
871 if (entry
->state
.out
)
872 if (entry
->state
.out
->ifindex
== ifindex
)
874 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
875 if (entry
->skb
->nf_bridge
) {
876 int physinif
, physoutif
;
878 physinif
= nf_bridge_get_physinif(entry
->skb
);
879 physoutif
= nf_bridge_get_physoutif(entry
->skb
);
881 if (physinif
== ifindex
|| physoutif
== ifindex
)
888 /* drop all packets with either indev or outdev == ifindex from all queue
891 nfqnl_dev_drop(struct net
*net
, int ifindex
)
894 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
898 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
899 struct nfqnl_instance
*inst
;
900 struct hlist_head
*head
= &q
->instance_table
[i
];
902 hlist_for_each_entry_rcu(inst
, head
, hlist
)
903 nfqnl_flush(inst
, dev_cmp
, ifindex
);
910 nfqnl_rcv_dev_event(struct notifier_block
*this,
911 unsigned long event
, void *ptr
)
913 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
915 /* Drop any packets associated with the downed device */
916 if (event
== NETDEV_DOWN
)
917 nfqnl_dev_drop(dev_net(dev
), dev
->ifindex
);
921 static struct notifier_block nfqnl_dev_notifier
= {
922 .notifier_call
= nfqnl_rcv_dev_event
,
925 static int nf_hook_cmp(struct nf_queue_entry
*entry
, unsigned long entry_ptr
)
927 return rcu_access_pointer(entry
->hook
) ==
928 (struct nf_hook_entry
*)entry_ptr
;
931 static void nfqnl_nf_hook_drop(struct net
*net
,
932 const struct nf_hook_entry
*hook
)
934 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
938 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
939 struct nfqnl_instance
*inst
;
940 struct hlist_head
*head
= &q
->instance_table
[i
];
942 hlist_for_each_entry_rcu(inst
, head
, hlist
)
943 nfqnl_flush(inst
, nf_hook_cmp
, (unsigned long)hook
);
949 nfqnl_rcv_nl_event(struct notifier_block
*this,
950 unsigned long event
, void *ptr
)
952 struct netlink_notify
*n
= ptr
;
953 struct nfnl_queue_net
*q
= nfnl_queue_pernet(n
->net
);
955 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
958 /* destroy all instances for this portid */
959 spin_lock(&q
->instances_lock
);
960 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
961 struct hlist_node
*t2
;
962 struct nfqnl_instance
*inst
;
963 struct hlist_head
*head
= &q
->instance_table
[i
];
965 hlist_for_each_entry_safe(inst
, t2
, head
, hlist
) {
966 if (n
->portid
== inst
->peer_portid
)
967 __instance_destroy(inst
);
970 spin_unlock(&q
->instances_lock
);
975 static struct notifier_block nfqnl_rtnl_notifier
= {
976 .notifier_call
= nfqnl_rcv_nl_event
,
979 static const struct nla_policy nfqa_vlan_policy
[NFQA_VLAN_MAX
+ 1] = {
980 [NFQA_VLAN_TCI
] = { .type
= NLA_U16
},
981 [NFQA_VLAN_PROTO
] = { .type
= NLA_U16
},
984 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
985 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
986 [NFQA_MARK
] = { .type
= NLA_U32
},
987 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
988 [NFQA_CT
] = { .type
= NLA_UNSPEC
},
989 [NFQA_EXP
] = { .type
= NLA_UNSPEC
},
990 [NFQA_VLAN
] = { .type
= NLA_NESTED
},
993 static const struct nla_policy nfqa_verdict_batch_policy
[NFQA_MAX
+1] = {
994 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
995 [NFQA_MARK
] = { .type
= NLA_U32
},
998 static struct nfqnl_instance
*
999 verdict_instance_lookup(struct nfnl_queue_net
*q
, u16 queue_num
, u32 nlportid
)
1001 struct nfqnl_instance
*queue
;
1003 queue
= instance_lookup(q
, queue_num
);
1005 return ERR_PTR(-ENODEV
);
1007 if (queue
->peer_portid
!= nlportid
)
1008 return ERR_PTR(-EPERM
);
1013 static struct nfqnl_msg_verdict_hdr
*
1014 verdicthdr_get(const struct nlattr
* const nfqa
[])
1016 struct nfqnl_msg_verdict_hdr
*vhdr
;
1017 unsigned int verdict
;
1019 if (!nfqa
[NFQA_VERDICT_HDR
])
1022 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
1023 verdict
= ntohl(vhdr
->verdict
) & NF_VERDICT_MASK
;
1024 if (verdict
> NF_MAX_VERDICT
|| verdict
== NF_STOLEN
)
1029 static int nfq_id_after(unsigned int id
, unsigned int max
)
1031 return (int)(id
- max
) > 0;
1034 static int nfqnl_recv_verdict_batch(struct net
*net
, struct sock
*ctnl
,
1035 struct sk_buff
*skb
,
1036 const struct nlmsghdr
*nlh
,
1037 const struct nlattr
* const nfqa
[])
1039 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1040 struct nf_queue_entry
*entry
, *tmp
;
1041 unsigned int verdict
, maxid
;
1042 struct nfqnl_msg_verdict_hdr
*vhdr
;
1043 struct nfqnl_instance
*queue
;
1044 LIST_HEAD(batch_list
);
1045 u16 queue_num
= ntohs(nfmsg
->res_id
);
1046 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1048 queue
= verdict_instance_lookup(q
, queue_num
,
1049 NETLINK_CB(skb
).portid
);
1051 return PTR_ERR(queue
);
1053 vhdr
= verdicthdr_get(nfqa
);
1057 verdict
= ntohl(vhdr
->verdict
);
1058 maxid
= ntohl(vhdr
->id
);
1060 spin_lock_bh(&queue
->lock
);
1062 list_for_each_entry_safe(entry
, tmp
, &queue
->queue_list
, list
) {
1063 if (nfq_id_after(entry
->id
, maxid
))
1065 __dequeue_entry(queue
, entry
);
1066 list_add_tail(&entry
->list
, &batch_list
);
1069 spin_unlock_bh(&queue
->lock
);
1071 if (list_empty(&batch_list
))
1074 list_for_each_entry_safe(entry
, tmp
, &batch_list
, list
) {
1075 if (nfqa
[NFQA_MARK
])
1076 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
1077 nf_reinject(entry
, verdict
);
1082 static struct nf_conn
*nfqnl_ct_parse(struct nfnl_ct_hook
*nfnl_ct
,
1083 const struct nlmsghdr
*nlh
,
1084 const struct nlattr
* const nfqa
[],
1085 struct nf_queue_entry
*entry
,
1086 enum ip_conntrack_info
*ctinfo
)
1090 ct
= nfnl_ct
->get_ct(entry
->skb
, ctinfo
);
1094 if (nfnl_ct
->parse(nfqa
[NFQA_CT
], ct
) < 0)
1098 nfnl_ct
->attach_expect(nfqa
[NFQA_EXP
], ct
,
1099 NETLINK_CB(entry
->skb
).portid
,
1104 static int nfqa_parse_bridge(struct nf_queue_entry
*entry
,
1105 const struct nlattr
* const nfqa
[])
1107 if (nfqa
[NFQA_VLAN
]) {
1108 struct nlattr
*tb
[NFQA_VLAN_MAX
+ 1];
1111 err
= nla_parse_nested(tb
, NFQA_VLAN_MAX
, nfqa
[NFQA_VLAN
],
1112 nfqa_vlan_policy
, NULL
);
1116 if (!tb
[NFQA_VLAN_TCI
] || !tb
[NFQA_VLAN_PROTO
])
1119 entry
->skb
->vlan_tci
= ntohs(nla_get_be16(tb
[NFQA_VLAN_TCI
]));
1120 entry
->skb
->vlan_proto
= nla_get_be16(tb
[NFQA_VLAN_PROTO
]);
1123 if (nfqa
[NFQA_L2HDR
]) {
1124 int mac_header_len
= entry
->skb
->network_header
-
1125 entry
->skb
->mac_header
;
1127 if (mac_header_len
!= nla_len(nfqa
[NFQA_L2HDR
]))
1129 else if (mac_header_len
> 0)
1130 memcpy(skb_mac_header(entry
->skb
),
1131 nla_data(nfqa
[NFQA_L2HDR
]),
1138 static int nfqnl_recv_verdict(struct net
*net
, struct sock
*ctnl
,
1139 struct sk_buff
*skb
,
1140 const struct nlmsghdr
*nlh
,
1141 const struct nlattr
* const nfqa
[])
1143 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1144 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
1145 struct nfqnl_msg_verdict_hdr
*vhdr
;
1146 struct nfqnl_instance
*queue
;
1147 unsigned int verdict
;
1148 struct nf_queue_entry
*entry
;
1149 enum ip_conntrack_info
uninitialized_var(ctinfo
);
1150 struct nfnl_ct_hook
*nfnl_ct
;
1151 struct nf_conn
*ct
= NULL
;
1152 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1155 queue
= verdict_instance_lookup(q
, queue_num
,
1156 NETLINK_CB(skb
).portid
);
1158 return PTR_ERR(queue
);
1160 vhdr
= verdicthdr_get(nfqa
);
1164 verdict
= ntohl(vhdr
->verdict
);
1166 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
1170 /* rcu lock already held from nfnl->call_rcu. */
1171 nfnl_ct
= rcu_dereference(nfnl_ct_hook
);
1173 if (nfqa
[NFQA_CT
]) {
1174 if (nfnl_ct
!= NULL
)
1175 ct
= nfqnl_ct_parse(nfnl_ct
, nlh
, nfqa
, entry
, &ctinfo
);
1178 if (entry
->state
.pf
== PF_BRIDGE
) {
1179 err
= nfqa_parse_bridge(entry
, nfqa
);
1184 if (nfqa
[NFQA_PAYLOAD
]) {
1185 u16 payload_len
= nla_len(nfqa
[NFQA_PAYLOAD
]);
1186 int diff
= payload_len
- entry
->skb
->len
;
1188 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
1189 payload_len
, entry
, diff
) < 0)
1193 nfnl_ct
->seq_adjust(entry
->skb
, ct
, ctinfo
, diff
);
1196 if (nfqa
[NFQA_MARK
])
1197 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
1199 nf_reinject(entry
, verdict
);
1203 static int nfqnl_recv_unsupp(struct net
*net
, struct sock
*ctnl
,
1204 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1205 const struct nlattr
* const nfqa
[])
1210 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
1211 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
1212 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
1215 static const struct nf_queue_handler nfqh
= {
1216 .outfn
= &nfqnl_enqueue_packet
,
1217 .nf_hook_drop
= &nfqnl_nf_hook_drop
,
1220 static int nfqnl_recv_config(struct net
*net
, struct sock
*ctnl
,
1221 struct sk_buff
*skb
, const struct nlmsghdr
*nlh
,
1222 const struct nlattr
* const nfqa
[])
1224 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1225 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
1226 struct nfqnl_instance
*queue
;
1227 struct nfqnl_msg_config_cmd
*cmd
= NULL
;
1228 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1229 __u32 flags
= 0, mask
= 0;
1232 if (nfqa
[NFQA_CFG_CMD
]) {
1233 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
1235 /* Obsolete commands without queue context */
1236 switch (cmd
->command
) {
1237 case NFQNL_CFG_CMD_PF_BIND
: return 0;
1238 case NFQNL_CFG_CMD_PF_UNBIND
: return 0;
1242 /* Check if we support these flags in first place, dependencies should
1243 * be there too not to break atomicity.
1245 if (nfqa
[NFQA_CFG_FLAGS
]) {
1246 if (!nfqa
[NFQA_CFG_MASK
]) {
1247 /* A mask is needed to specify which flags are being
1253 flags
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_FLAGS
]));
1254 mask
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_MASK
]));
1256 if (flags
>= NFQA_CFG_F_MAX
)
1259 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1260 if (flags
& mask
& NFQA_CFG_F_SECCTX
)
1263 if ((flags
& mask
& NFQA_CFG_F_CONNTRACK
) &&
1264 !rcu_access_pointer(nfnl_ct_hook
)) {
1265 #ifdef CONFIG_MODULES
1266 nfnl_unlock(NFNL_SUBSYS_QUEUE
);
1267 request_module("ip_conntrack_netlink");
1268 nfnl_lock(NFNL_SUBSYS_QUEUE
);
1269 if (rcu_access_pointer(nfnl_ct_hook
))
1277 queue
= instance_lookup(q
, queue_num
);
1278 if (queue
&& queue
->peer_portid
!= NETLINK_CB(skb
).portid
) {
1280 goto err_out_unlock
;
1284 switch (cmd
->command
) {
1285 case NFQNL_CFG_CMD_BIND
:
1288 goto err_out_unlock
;
1290 queue
= instance_create(q
, queue_num
,
1291 NETLINK_CB(skb
).portid
);
1292 if (IS_ERR(queue
)) {
1293 ret
= PTR_ERR(queue
);
1294 goto err_out_unlock
;
1297 case NFQNL_CFG_CMD_UNBIND
:
1300 goto err_out_unlock
;
1302 instance_destroy(q
, queue
);
1303 goto err_out_unlock
;
1304 case NFQNL_CFG_CMD_PF_BIND
:
1305 case NFQNL_CFG_CMD_PF_UNBIND
:
1309 goto err_out_unlock
;
1315 goto err_out_unlock
;
1318 if (nfqa
[NFQA_CFG_PARAMS
]) {
1319 struct nfqnl_msg_config_params
*params
=
1320 nla_data(nfqa
[NFQA_CFG_PARAMS
]);
1322 nfqnl_set_mode(queue
, params
->copy_mode
,
1323 ntohl(params
->copy_range
));
1326 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
1327 __be32
*queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
1329 spin_lock_bh(&queue
->lock
);
1330 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
1331 spin_unlock_bh(&queue
->lock
);
1334 if (nfqa
[NFQA_CFG_FLAGS
]) {
1335 spin_lock_bh(&queue
->lock
);
1336 queue
->flags
&= ~mask
;
1337 queue
->flags
|= flags
& mask
;
1338 spin_unlock_bh(&queue
->lock
);
1346 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
1347 [NFQNL_MSG_PACKET
] = { .call_rcu
= nfqnl_recv_unsupp
,
1348 .attr_count
= NFQA_MAX
, },
1349 [NFQNL_MSG_VERDICT
] = { .call_rcu
= nfqnl_recv_verdict
,
1350 .attr_count
= NFQA_MAX
,
1351 .policy
= nfqa_verdict_policy
},
1352 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
1353 .attr_count
= NFQA_CFG_MAX
,
1354 .policy
= nfqa_cfg_policy
},
1355 [NFQNL_MSG_VERDICT_BATCH
]={ .call_rcu
= nfqnl_recv_verdict_batch
,
1356 .attr_count
= NFQA_MAX
,
1357 .policy
= nfqa_verdict_batch_policy
},
1360 static const struct nfnetlink_subsystem nfqnl_subsys
= {
1362 .subsys_id
= NFNL_SUBSYS_QUEUE
,
1363 .cb_count
= NFQNL_MSG_MAX
,
1367 #ifdef CONFIG_PROC_FS
1369 struct seq_net_private p
;
1370 unsigned int bucket
;
1373 static struct hlist_node
*get_first(struct seq_file
*seq
)
1375 struct iter_state
*st
= seq
->private;
1377 struct nfnl_queue_net
*q
;
1382 net
= seq_file_net(seq
);
1383 q
= nfnl_queue_pernet(net
);
1384 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
1385 if (!hlist_empty(&q
->instance_table
[st
->bucket
]))
1386 return q
->instance_table
[st
->bucket
].first
;
1391 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
1393 struct iter_state
*st
= seq
->private;
1394 struct net
*net
= seq_file_net(seq
);
1398 struct nfnl_queue_net
*q
;
1400 if (++st
->bucket
>= INSTANCE_BUCKETS
)
1403 q
= nfnl_queue_pernet(net
);
1404 h
= q
->instance_table
[st
->bucket
].first
;
1409 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
1411 struct hlist_node
*head
;
1412 head
= get_first(seq
);
1415 while (pos
&& (head
= get_next(seq
, head
)))
1417 return pos
? NULL
: head
;
1420 static void *seq_start(struct seq_file
*s
, loff_t
*pos
)
1421 __acquires(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1423 spin_lock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1424 return get_idx(s
, *pos
);
1427 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1430 return get_next(s
, v
);
1433 static void seq_stop(struct seq_file
*s
, void *v
)
1434 __releases(nfnl_queue_pernet(seq_file_net(s
))->instances_lock
)
1436 spin_unlock(&nfnl_queue_pernet(seq_file_net(s
))->instances_lock
);
1439 static int seq_show(struct seq_file
*s
, void *v
)
1441 const struct nfqnl_instance
*inst
= v
;
1443 seq_printf(s
, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1445 inst
->peer_portid
, inst
->queue_total
,
1446 inst
->copy_mode
, inst
->copy_range
,
1447 inst
->queue_dropped
, inst
->queue_user_dropped
,
1448 inst
->id_sequence
, 1);
1452 static const struct seq_operations nfqnl_seq_ops
= {
1459 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
1461 return seq_open_net(inode
, file
, &nfqnl_seq_ops
,
1462 sizeof(struct iter_state
));
1465 static const struct file_operations nfqnl_file_ops
= {
1466 .owner
= THIS_MODULE
,
1469 .llseek
= seq_lseek
,
1470 .release
= seq_release_net
,
1473 #endif /* PROC_FS */
1475 static int __net_init
nfnl_queue_net_init(struct net
*net
)
1478 struct nfnl_queue_net
*q
= nfnl_queue_pernet(net
);
1480 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1481 INIT_HLIST_HEAD(&q
->instance_table
[i
]);
1483 spin_lock_init(&q
->instances_lock
);
1485 #ifdef CONFIG_PROC_FS
1486 if (!proc_create("nfnetlink_queue", 0440,
1487 net
->nf
.proc_netfilter
, &nfqnl_file_ops
))
1490 nf_register_queue_handler(net
, &nfqh
);
1494 static void __net_exit
nfnl_queue_net_exit(struct net
*net
)
1496 nf_unregister_queue_handler(net
);
1497 #ifdef CONFIG_PROC_FS
1498 remove_proc_entry("nfnetlink_queue", net
->nf
.proc_netfilter
);
1502 static void nfnl_queue_net_exit_batch(struct list_head
*net_exit_list
)
1507 static struct pernet_operations nfnl_queue_net_ops
= {
1508 .init
= nfnl_queue_net_init
,
1509 .exit
= nfnl_queue_net_exit
,
1510 .exit_batch
= nfnl_queue_net_exit_batch
,
1511 .id
= &nfnl_queue_net_id
,
1512 .size
= sizeof(struct nfnl_queue_net
),
1515 static int __init
nfnetlink_queue_init(void)
1519 status
= register_pernet_subsys(&nfnl_queue_net_ops
);
1521 pr_err("nf_queue: failed to register pernet ops\n");
1525 netlink_register_notifier(&nfqnl_rtnl_notifier
);
1526 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
1528 pr_err("nf_queue: failed to create netlink socket\n");
1529 goto cleanup_netlink_notifier
;
1532 status
= register_netdevice_notifier(&nfqnl_dev_notifier
);
1534 pr_err("nf_queue: failed to register netdevice notifier\n");
1535 goto cleanup_netlink_subsys
;
1540 cleanup_netlink_subsys
:
1541 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1542 cleanup_netlink_notifier
:
1543 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1544 unregister_pernet_subsys(&nfnl_queue_net_ops
);
1549 static void __exit
nfnetlink_queue_fini(void)
1551 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1552 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1553 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1554 unregister_pernet_subsys(&nfnl_queue_net_ops
);
1556 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1559 MODULE_DESCRIPTION("netfilter packet queue handler");
1560 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1561 MODULE_LICENSE("GPL");
1562 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1564 module_init(nfnetlink_queue_init
);
1565 module_exit(nfnetlink_queue_fini
);