2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfetlink.
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
7 * Based on the old ipv4-only ip_queue.c:
8 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
9 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/skbuff.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/notifier.h>
21 #include <linux/netdevice.h>
22 #include <linux/netfilter.h>
23 #include <linux/proc_fs.h>
24 #include <linux/netfilter_ipv4.h>
25 #include <linux/netfilter_ipv6.h>
26 #include <linux/netfilter/nfnetlink.h>
27 #include <linux/netfilter/nfnetlink_queue.h>
28 #include <linux/list.h>
30 #include <net/netfilter/nf_queue.h>
32 #include <asm/atomic.h>
34 #ifdef CONFIG_BRIDGE_NETFILTER
35 #include "../bridge/br_private.h"
38 #define NFQNL_QMAX_DEFAULT 1024
41 #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
42 __FILE__, __LINE__, __FUNCTION__, \
45 #define QDEBUG(x, ...)
48 struct nfqnl_instance
{
49 struct hlist_node hlist
; /* global list of queues */
53 unsigned int queue_maxlen
;
54 unsigned int copy_range
;
55 unsigned int queue_total
;
56 unsigned int queue_dropped
;
57 unsigned int queue_user_dropped
;
59 atomic_t id_sequence
; /* 'sequence' of pkt ids */
61 u_int16_t queue_num
; /* number of this queue */
66 struct list_head queue_list
; /* packets in queue */
69 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
71 static DEFINE_RWLOCK(instances_lock
);
73 #define INSTANCE_BUCKETS 16
74 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
76 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
78 return ((queue_num
>> 8) | queue_num
) % INSTANCE_BUCKETS
;
81 static struct nfqnl_instance
*
82 __instance_lookup(u_int16_t queue_num
)
84 struct hlist_head
*head
;
85 struct hlist_node
*pos
;
86 struct nfqnl_instance
*inst
;
88 head
= &instance_table
[instance_hashfn(queue_num
)];
89 hlist_for_each_entry(inst
, pos
, head
, hlist
) {
90 if (inst
->queue_num
== queue_num
)
96 static struct nfqnl_instance
*
97 instance_lookup_get(u_int16_t queue_num
)
99 struct nfqnl_instance
*inst
;
101 read_lock_bh(&instances_lock
);
102 inst
= __instance_lookup(queue_num
);
104 atomic_inc(&inst
->use
);
105 read_unlock_bh(&instances_lock
);
111 instance_put(struct nfqnl_instance
*inst
)
113 if (inst
&& atomic_dec_and_test(&inst
->use
)) {
114 QDEBUG("kfree(inst=%p)\n", inst
);
119 static struct nfqnl_instance
*
120 instance_create(u_int16_t queue_num
, int pid
)
122 struct nfqnl_instance
*inst
;
124 QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num
, pid
);
126 write_lock_bh(&instances_lock
);
127 if (__instance_lookup(queue_num
)) {
129 QDEBUG("aborting, instance already exists\n");
133 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
137 inst
->queue_num
= queue_num
;
138 inst
->peer_pid
= pid
;
139 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
140 inst
->copy_range
= 0xfffff;
141 inst
->copy_mode
= NFQNL_COPY_NONE
;
142 atomic_set(&inst
->id_sequence
, 0);
143 /* needs to be two, since we _put() after creation */
144 atomic_set(&inst
->use
, 2);
145 spin_lock_init(&inst
->lock
);
146 INIT_LIST_HEAD(&inst
->queue_list
);
148 if (!try_module_get(THIS_MODULE
))
151 hlist_add_head(&inst
->hlist
,
152 &instance_table
[instance_hashfn(queue_num
)]);
154 write_unlock_bh(&instances_lock
);
156 QDEBUG("successfully created new instance\n");
163 write_unlock_bh(&instances_lock
);
167 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
171 _instance_destroy2(struct nfqnl_instance
*inst
, int lock
)
173 /* first pull it out of the global list */
175 write_lock_bh(&instances_lock
);
177 QDEBUG("removing instance %p (queuenum=%u) from hash\n",
178 inst
, inst
->queue_num
);
179 hlist_del(&inst
->hlist
);
182 write_unlock_bh(&instances_lock
);
184 /* then flush all pending skbs from the queue */
185 nfqnl_flush(inst
, NULL
, 0);
187 /* and finally put the refcount */
190 module_put(THIS_MODULE
);
194 __instance_destroy(struct nfqnl_instance
*inst
)
196 _instance_destroy2(inst
, 0);
200 instance_destroy(struct nfqnl_instance
*inst
)
202 _instance_destroy2(inst
, 1);
208 issue_verdict(struct nf_queue_entry
*entry
, int verdict
)
210 QDEBUG("entering for entry %p, verdict %u\n", entry
, verdict
);
212 /* TCP input path (and probably other bits) assume to be called
213 * from softirq context, not from syscall, like issue_verdict is
214 * called. TCP input path deadlocks with locks taken from timer
215 * softirq, e.g. We therefore emulate this by local_bh_disable() */
218 nf_reinject(entry
, verdict
);
223 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
225 list_add_tail(&entry
->list
, &queue
->queue_list
);
226 queue
->queue_total
++;
230 __nfqnl_set_mode(struct nfqnl_instance
*queue
,
231 unsigned char mode
, unsigned int range
)
236 case NFQNL_COPY_NONE
:
237 case NFQNL_COPY_META
:
238 queue
->copy_mode
= mode
;
239 queue
->copy_range
= 0;
242 case NFQNL_COPY_PACKET
:
243 queue
->copy_mode
= mode
;
244 /* we're using struct nlattr which has 16bit nla_len */
246 queue
->copy_range
= 0xffff;
248 queue
->copy_range
= range
;
258 static struct nf_queue_entry
*
259 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
261 struct nf_queue_entry
*entry
= NULL
, *i
;
263 spin_lock_bh(&queue
->lock
);
265 list_for_each_entry(i
, &queue
->queue_list
, list
) {
273 list_del(&entry
->list
);
274 queue
->queue_total
--;
277 spin_unlock_bh(&queue
->lock
);
283 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
285 struct nf_queue_entry
*entry
, *next
;
287 spin_lock_bh(&queue
->lock
);
288 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
289 if (!cmpfn
|| cmpfn(entry
, data
)) {
290 list_del(&entry
->list
);
291 queue
->queue_total
--;
292 issue_verdict(entry
, NF_DROP
);
295 spin_unlock_bh(&queue
->lock
);
298 static struct sk_buff
*
299 nfqnl_build_packet_message(struct nfqnl_instance
*queue
,
300 struct nf_queue_entry
*entry
, int *errp
)
302 sk_buff_data_t old_tail
;
306 struct nfqnl_msg_packet_hdr pmsg
;
307 struct nlmsghdr
*nlh
;
308 struct nfgenmsg
*nfmsg
;
309 struct sk_buff
*entskb
= entry
->skb
;
310 struct net_device
*indev
;
311 struct net_device
*outdev
;
316 size
= NLMSG_ALIGN(sizeof(struct nfgenmsg
))
317 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
318 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
319 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
320 #ifdef CONFIG_BRIDGE_NETFILTER
321 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
322 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
324 + nla_total_size(sizeof(u_int32_t
)) /* mark */
325 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
326 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
));
328 outdev
= entry
->outdev
;
330 spin_lock_bh(&queue
->lock
);
332 switch (queue
->copy_mode
) {
333 case NFQNL_COPY_META
:
334 case NFQNL_COPY_NONE
:
338 case NFQNL_COPY_PACKET
:
339 if ((entskb
->ip_summed
== CHECKSUM_PARTIAL
||
340 entskb
->ip_summed
== CHECKSUM_COMPLETE
) &&
341 (*errp
= skb_checksum_help(entskb
))) {
342 spin_unlock_bh(&queue
->lock
);
345 if (queue
->copy_range
== 0
346 || queue
->copy_range
> entskb
->len
)
347 data_len
= entskb
->len
;
349 data_len
= queue
->copy_range
;
351 size
+= nla_total_size(data_len
);
356 spin_unlock_bh(&queue
->lock
);
360 spin_unlock_bh(&queue
->lock
);
362 skb
= alloc_skb(size
, GFP_ATOMIC
);
366 old_tail
= skb
->tail
;
367 nlh
= NLMSG_PUT(skb
, 0, 0,
368 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
369 sizeof(struct nfgenmsg
));
370 nfmsg
= NLMSG_DATA(nlh
);
371 nfmsg
->nfgen_family
= entry
->pf
;
372 nfmsg
->version
= NFNETLINK_V0
;
373 nfmsg
->res_id
= htons(queue
->queue_num
);
375 pmsg
.packet_id
= htonl(entry
->id
);
376 pmsg
.hw_protocol
= entskb
->protocol
;
377 pmsg
.hook
= entry
->hook
;
379 NLA_PUT(skb
, NFQA_PACKET_HDR
, sizeof(pmsg
), &pmsg
);
381 indev
= entry
->indev
;
383 tmp_uint
= htonl(indev
->ifindex
);
384 #ifndef CONFIG_BRIDGE_NETFILTER
385 NLA_PUT(skb
, NFQA_IFINDEX_INDEV
, sizeof(tmp_uint
), &tmp_uint
);
387 if (entry
->pf
== PF_BRIDGE
) {
388 /* Case 1: indev is physical input device, we need to
389 * look for bridge group (when called from
390 * netfilter_bridge) */
391 NLA_PUT(skb
, NFQA_IFINDEX_PHYSINDEV
, sizeof(tmp_uint
),
393 /* this is the bridge group "brX" */
394 tmp_uint
= htonl(indev
->br_port
->br
->dev
->ifindex
);
395 NLA_PUT(skb
, NFQA_IFINDEX_INDEV
, sizeof(tmp_uint
),
398 /* Case 2: indev is bridge group, we need to look for
399 * physical device (when called from ipv4) */
400 NLA_PUT(skb
, NFQA_IFINDEX_INDEV
, sizeof(tmp_uint
),
402 if (entskb
->nf_bridge
403 && entskb
->nf_bridge
->physindev
) {
404 tmp_uint
= htonl(entskb
->nf_bridge
->physindev
->ifindex
);
405 NLA_PUT(skb
, NFQA_IFINDEX_PHYSINDEV
,
406 sizeof(tmp_uint
), &tmp_uint
);
413 tmp_uint
= htonl(outdev
->ifindex
);
414 #ifndef CONFIG_BRIDGE_NETFILTER
415 NLA_PUT(skb
, NFQA_IFINDEX_OUTDEV
, sizeof(tmp_uint
), &tmp_uint
);
417 if (entry
->pf
== PF_BRIDGE
) {
418 /* Case 1: outdev is physical output device, we need to
419 * look for bridge group (when called from
420 * netfilter_bridge) */
421 NLA_PUT(skb
, NFQA_IFINDEX_PHYSOUTDEV
, sizeof(tmp_uint
),
423 /* this is the bridge group "brX" */
424 tmp_uint
= htonl(outdev
->br_port
->br
->dev
->ifindex
);
425 NLA_PUT(skb
, NFQA_IFINDEX_OUTDEV
, sizeof(tmp_uint
),
428 /* Case 2: outdev is bridge group, we need to look for
429 * physical output device (when called from ipv4) */
430 NLA_PUT(skb
, NFQA_IFINDEX_OUTDEV
, sizeof(tmp_uint
),
432 if (entskb
->nf_bridge
433 && entskb
->nf_bridge
->physoutdev
) {
434 tmp_uint
= htonl(entskb
->nf_bridge
->physoutdev
->ifindex
);
435 NLA_PUT(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
436 sizeof(tmp_uint
), &tmp_uint
);
443 tmp_uint
= htonl(entskb
->mark
);
444 NLA_PUT(skb
, NFQA_MARK
, sizeof(u_int32_t
), &tmp_uint
);
447 if (indev
&& entskb
->dev
) {
448 struct nfqnl_msg_packet_hw phw
;
449 int len
= dev_parse_header(entskb
, phw
.hw_addr
);
451 phw
.hw_addrlen
= htons(len
);
452 NLA_PUT(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
);
456 if (entskb
->tstamp
.tv64
) {
457 struct nfqnl_msg_packet_timestamp ts
;
458 struct timeval tv
= ktime_to_timeval(entskb
->tstamp
);
459 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
460 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
462 NLA_PUT(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
);
467 int size
= nla_attr_size(data_len
);
469 if (skb_tailroom(skb
) < nla_total_size(data_len
)) {
470 printk(KERN_WARNING
"nf_queue: no tailroom!\n");
474 nla
= (struct nlattr
*)skb_put(skb
, nla_total_size(data_len
));
475 nla
->nla_type
= NFQA_PAYLOAD
;
478 if (skb_copy_bits(entskb
, 0, nla_data(nla
), data_len
))
482 nlh
->nlmsg_len
= skb
->tail
- old_tail
;
491 printk(KERN_ERR
"nf_queue: error creating packet message\n");
496 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
498 int status
= -EINVAL
;
499 struct sk_buff
*nskb
;
500 struct nfqnl_instance
*queue
;
504 queue
= instance_lookup_get(queuenum
);
506 QDEBUG("no queue instance matching\n");
510 if (queue
->copy_mode
== NFQNL_COPY_NONE
) {
511 QDEBUG("mode COPY_NONE, aborting\n");
516 entry
->id
= atomic_inc_return(&queue
->id_sequence
);
518 nskb
= nfqnl_build_packet_message(queue
, entry
, &status
);
522 spin_lock_bh(&queue
->lock
);
524 if (!queue
->peer_pid
)
525 goto err_out_free_nskb
;
527 if (queue
->queue_total
>= queue
->queue_maxlen
) {
528 queue
->queue_dropped
++;
531 printk(KERN_WARNING
"nf_queue: full at %d entries, "
532 "dropping packets(s). Dropped: %d\n",
533 queue
->queue_total
, queue
->queue_dropped
);
534 goto err_out_free_nskb
;
537 /* nfnetlink_unicast will either free the nskb or add it to a socket */
538 status
= nfnetlink_unicast(nskb
, queue
->peer_pid
, MSG_DONTWAIT
);
540 queue
->queue_user_dropped
++;
544 __enqueue_entry(queue
, entry
);
546 spin_unlock_bh(&queue
->lock
);
554 spin_unlock_bh(&queue
->lock
);
562 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
)
567 diff
= data_len
- e
->skb
->len
;
569 if (pskb_trim(e
->skb
, data_len
))
571 } else if (diff
> 0) {
572 if (data_len
> 0xFFFF)
574 if (diff
> skb_tailroom(e
->skb
)) {
575 err
= pskb_expand_head(e
->skb
, 0,
576 diff
- skb_tailroom(e
->skb
),
579 printk(KERN_WARNING
"nf_queue: OOM "
580 "in mangle, dropping packet\n");
584 skb_put(e
->skb
, diff
);
586 if (!skb_make_writable(e
->skb
, data_len
))
588 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
589 e
->skb
->ip_summed
= CHECKSUM_NONE
;
594 nfqnl_set_mode(struct nfqnl_instance
*queue
,
595 unsigned char mode
, unsigned int range
)
599 spin_lock_bh(&queue
->lock
);
600 status
= __nfqnl_set_mode(queue
, mode
, range
);
601 spin_unlock_bh(&queue
->lock
);
607 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
610 if (entry
->indev
->ifindex
== ifindex
)
613 if (entry
->outdev
->ifindex
== ifindex
)
615 #ifdef CONFIG_BRIDGE_NETFILTER
616 if (entry
->skb
->nf_bridge
) {
617 if (entry
->skb
->nf_bridge
->physindev
&&
618 entry
->skb
->nf_bridge
->physindev
->ifindex
== ifindex
)
620 if (entry
->skb
->nf_bridge
->physoutdev
&&
621 entry
->skb
->nf_bridge
->physoutdev
->ifindex
== ifindex
)
628 /* drop all packets with either indev or outdev == ifindex from all queue
631 nfqnl_dev_drop(int ifindex
)
635 QDEBUG("entering for ifindex %u\n", ifindex
);
637 /* this only looks like we have to hold the readlock for a way too long
638 * time, issue_verdict(), nf_reinject(), ... - but we always only
639 * issue NF_DROP, which is processed directly in nf_reinject() */
640 read_lock_bh(&instances_lock
);
642 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
643 struct hlist_node
*tmp
;
644 struct nfqnl_instance
*inst
;
645 struct hlist_head
*head
= &instance_table
[i
];
647 hlist_for_each_entry(inst
, tmp
, head
, hlist
)
648 nfqnl_flush(inst
, dev_cmp
, ifindex
);
651 read_unlock_bh(&instances_lock
);
654 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
657 nfqnl_rcv_dev_event(struct notifier_block
*this,
658 unsigned long event
, void *ptr
)
660 struct net_device
*dev
= ptr
;
662 if (dev
->nd_net
!= &init_net
)
665 /* Drop any packets associated with the downed device */
666 if (event
== NETDEV_DOWN
)
667 nfqnl_dev_drop(dev
->ifindex
);
671 static struct notifier_block nfqnl_dev_notifier
= {
672 .notifier_call
= nfqnl_rcv_dev_event
,
676 nfqnl_rcv_nl_event(struct notifier_block
*this,
677 unsigned long event
, void *ptr
)
679 struct netlink_notify
*n
= ptr
;
681 if (event
== NETLINK_URELEASE
&&
682 n
->protocol
== NETLINK_NETFILTER
&& n
->pid
) {
685 /* destroy all instances for this pid */
686 write_lock_bh(&instances_lock
);
687 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
688 struct hlist_node
*tmp
, *t2
;
689 struct nfqnl_instance
*inst
;
690 struct hlist_head
*head
= &instance_table
[i
];
692 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
693 if ((n
->net
== &init_net
) &&
694 (n
->pid
== inst
->peer_pid
))
695 __instance_destroy(inst
);
698 write_unlock_bh(&instances_lock
);
703 static struct notifier_block nfqnl_rtnl_notifier
= {
704 .notifier_call
= nfqnl_rcv_nl_event
,
707 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
708 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
709 [NFQA_MARK
] = { .type
= NLA_U32
},
710 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
714 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
715 struct nlmsghdr
*nlh
, struct nlattr
*nfqa
[])
717 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
718 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
720 struct nfqnl_msg_verdict_hdr
*vhdr
;
721 struct nfqnl_instance
*queue
;
722 unsigned int verdict
;
723 struct nf_queue_entry
*entry
;
726 queue
= instance_lookup_get(queue_num
);
730 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
) {
735 if (!nfqa
[NFQA_VERDICT_HDR
]) {
740 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
741 verdict
= ntohl(vhdr
->verdict
);
743 if ((verdict
& NF_VERDICT_MASK
) > NF_MAX_VERDICT
) {
748 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
754 if (nfqa
[NFQA_PAYLOAD
]) {
755 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
756 nla_len(nfqa
[NFQA_PAYLOAD
]), entry
) < 0)
761 entry
->skb
->mark
= ntohl(*(__be32
*)
762 nla_data(nfqa
[NFQA_MARK
]));
764 issue_verdict(entry
, verdict
);
774 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
775 struct nlmsghdr
*nlh
, struct nlattr
*nfqa
[])
780 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
781 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
782 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
785 static const struct nf_queue_handler nfqh
= {
787 .outfn
= &nfqnl_enqueue_packet
,
791 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
792 struct nlmsghdr
*nlh
, struct nlattr
*nfqa
[])
794 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
795 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
796 struct nfqnl_instance
*queue
;
799 QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh
->nlmsg_type
));
801 queue
= instance_lookup_get(queue_num
);
802 if (nfqa
[NFQA_CFG_CMD
]) {
803 struct nfqnl_msg_config_cmd
*cmd
;
804 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
805 QDEBUG("found CFG_CMD\n");
807 switch (cmd
->command
) {
808 case NFQNL_CFG_CMD_BIND
:
812 queue
= instance_create(queue_num
, NETLINK_CB(skb
).pid
);
816 case NFQNL_CFG_CMD_UNBIND
:
820 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
) {
825 instance_destroy(queue
);
827 case NFQNL_CFG_CMD_PF_BIND
:
828 QDEBUG("registering queue handler for pf=%u\n",
830 ret
= nf_register_queue_handler(ntohs(cmd
->pf
), &nfqh
);
832 case NFQNL_CFG_CMD_PF_UNBIND
:
833 QDEBUG("unregistering queue handler for pf=%u\n",
835 ret
= nf_unregister_queue_handler(ntohs(cmd
->pf
), &nfqh
);
843 QDEBUG("no config command, and no instance ENOENT\n");
848 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
) {
849 QDEBUG("no config command, and wrong pid\n");
855 if (nfqa
[NFQA_CFG_PARAMS
]) {
856 struct nfqnl_msg_config_params
*params
;
862 params
= nla_data(nfqa
[NFQA_CFG_PARAMS
]);
863 nfqnl_set_mode(queue
, params
->copy_mode
,
864 ntohl(params
->copy_range
));
867 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
868 __be32
*queue_maxlen
;
869 queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
870 spin_lock_bh(&queue
->lock
);
871 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
872 spin_unlock_bh(&queue
->lock
);
880 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
881 [NFQNL_MSG_PACKET
] = { .call
= nfqnl_recv_unsupp
,
882 .attr_count
= NFQA_MAX
, },
883 [NFQNL_MSG_VERDICT
] = { .call
= nfqnl_recv_verdict
,
884 .attr_count
= NFQA_MAX
,
885 .policy
= nfqa_verdict_policy
},
886 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
887 .attr_count
= NFQA_CFG_MAX
,
888 .policy
= nfqa_cfg_policy
},
891 static const struct nfnetlink_subsystem nfqnl_subsys
= {
893 .subsys_id
= NFNL_SUBSYS_QUEUE
,
894 .cb_count
= NFQNL_MSG_MAX
,
898 #ifdef CONFIG_PROC_FS
903 static struct hlist_node
*get_first(struct seq_file
*seq
)
905 struct iter_state
*st
= seq
->private;
910 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
911 if (!hlist_empty(&instance_table
[st
->bucket
]))
912 return instance_table
[st
->bucket
].first
;
917 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
919 struct iter_state
*st
= seq
->private;
923 if (++st
->bucket
>= INSTANCE_BUCKETS
)
926 h
= instance_table
[st
->bucket
].first
;
931 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
933 struct hlist_node
*head
;
934 head
= get_first(seq
);
937 while (pos
&& (head
= get_next(seq
, head
)))
939 return pos
? NULL
: head
;
942 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
944 read_lock_bh(&instances_lock
);
945 return get_idx(seq
, *pos
);
948 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
951 return get_next(s
, v
);
954 static void seq_stop(struct seq_file
*s
, void *v
)
956 read_unlock_bh(&instances_lock
);
959 static int seq_show(struct seq_file
*s
, void *v
)
961 const struct nfqnl_instance
*inst
= v
;
963 return seq_printf(s
, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
965 inst
->peer_pid
, inst
->queue_total
,
966 inst
->copy_mode
, inst
->copy_range
,
967 inst
->queue_dropped
, inst
->queue_user_dropped
,
968 atomic_read(&inst
->id_sequence
),
969 atomic_read(&inst
->use
));
972 static const struct seq_operations nfqnl_seq_ops
= {
979 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
981 return seq_open_private(file
, &nfqnl_seq_ops
,
982 sizeof(struct iter_state
));
985 static const struct file_operations nfqnl_file_ops
= {
986 .owner
= THIS_MODULE
,
990 .release
= seq_release_private
,
995 static int __init
nfnetlink_queue_init(void)
997 int i
, status
= -ENOMEM
;
998 #ifdef CONFIG_PROC_FS
999 struct proc_dir_entry
*proc_nfqueue
;
1002 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1003 INIT_HLIST_HEAD(&instance_table
[i
]);
1005 netlink_register_notifier(&nfqnl_rtnl_notifier
);
1006 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
1008 printk(KERN_ERR
"nf_queue: failed to create netlink socket\n");
1009 goto cleanup_netlink_notifier
;
1012 #ifdef CONFIG_PROC_FS
1013 proc_nfqueue
= create_proc_entry("nfnetlink_queue", 0440,
1014 proc_net_netfilter
);
1016 goto cleanup_subsys
;
1017 proc_nfqueue
->proc_fops
= &nfqnl_file_ops
;
1020 register_netdevice_notifier(&nfqnl_dev_notifier
);
1023 #ifdef CONFIG_PROC_FS
1025 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1027 cleanup_netlink_notifier
:
1028 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1032 static void __exit
nfnetlink_queue_fini(void)
1034 nf_unregister_queue_handlers(&nfqh
);
1035 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1036 #ifdef CONFIG_PROC_FS
1037 remove_proc_entry("nfnetlink_queue", proc_net_netfilter
);
1039 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1040 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1043 MODULE_DESCRIPTION("netfilter packet queue handler");
1044 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1045 MODULE_LICENSE("GPL");
1046 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1048 module_init(nfnetlink_queue_init
);
1049 module_exit(nfnetlink_queue_fini
);