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/nfnetlink.h>
29 #include <linux/netfilter/nfnetlink_queue.h>
30 #include <linux/list.h>
32 #include <net/netfilter/nf_queue.h>
34 #include <asm/atomic.h>
36 #ifdef CONFIG_BRIDGE_NETFILTER
37 #include "../bridge/br_private.h"
40 #define NFQNL_QMAX_DEFAULT 1024
42 struct nfqnl_instance {
43 struct hlist_node hlist; /* global list of queues */
47 unsigned int queue_maxlen;
48 unsigned int copy_range;
49 unsigned int queue_dropped;
50 unsigned int queue_user_dropped;
53 u_int16_t queue_num; /* number of this queue */
56 * Following fields are dirtied for each queued packet,
57 * keep them in same cache line if possible.
60 unsigned int queue_total;
61 unsigned int id_sequence; /* 'sequence' of pkt ids */
62 struct list_head queue_list; /* packets in queue */
65 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
67 static DEFINE_SPINLOCK(instances_lock);
69 #define INSTANCE_BUCKETS 16
70 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
72 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
74 return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
77 static struct nfqnl_instance *
78 instance_lookup(u_int16_t queue_num)
80 struct hlist_head *head;
81 struct hlist_node *pos;
82 struct nfqnl_instance *inst;
84 head = &instance_table[instance_hashfn(queue_num)];
85 hlist_for_each_entry_rcu(inst, pos, head, hlist) {
86 if (inst->queue_num == queue_num)
92 static struct nfqnl_instance *
93 instance_create(u_int16_t queue_num, int pid)
95 struct nfqnl_instance *inst;
99 spin_lock(&instances_lock);
100 if (instance_lookup(queue_num)) {
105 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
111 inst->queue_num = queue_num;
112 inst->peer_pid = pid;
113 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
114 inst->copy_range = 0xfffff;
115 inst->copy_mode = NFQNL_COPY_NONE;
116 spin_lock_init(&inst->lock);
117 INIT_LIST_HEAD(&inst->queue_list);
119 if (!try_module_get(THIS_MODULE)) {
124 h = instance_hashfn(queue_num);
125 hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
127 spin_unlock(&instances_lock);
134 spin_unlock(&instances_lock);
138 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
142 instance_destroy_rcu(struct rcu_head *head)
144 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
147 nfqnl_flush(inst, NULL, 0);
149 module_put(THIS_MODULE);
153 __instance_destroy(struct nfqnl_instance *inst)
155 hlist_del_rcu(&inst->hlist);
156 call_rcu(&inst->rcu, instance_destroy_rcu);
160 instance_destroy(struct nfqnl_instance *inst)
162 spin_lock(&instances_lock);
163 __instance_destroy(inst);
164 spin_unlock(&instances_lock);
168 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
170 list_add_tail(&entry->list, &queue->queue_list);
171 queue->queue_total++;
175 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
177 list_del(&entry->list);
178 queue->queue_total--;
181 static struct nf_queue_entry *
182 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
184 struct nf_queue_entry *entry = NULL, *i;
186 spin_lock_bh(&queue->lock);
188 list_for_each_entry(i, &queue->queue_list, list) {
196 __dequeue_entry(queue, entry);
198 spin_unlock_bh(&queue->lock);
204 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
206 struct nf_queue_entry *entry, *next;
208 spin_lock_bh(&queue->lock);
209 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
210 if (!cmpfn || cmpfn(entry, data)) {
211 list_del(&entry->list);
212 queue->queue_total--;
213 nf_reinject(entry, NF_DROP);
216 spin_unlock_bh(&queue->lock);
219 static struct sk_buff *
220 nfqnl_build_packet_message(struct nfqnl_instance *queue,
221 struct nf_queue_entry *entry,
222 __be32 **packet_id_ptr)
224 sk_buff_data_t old_tail;
229 struct nfqnl_msg_packet_hdr *pmsg;
230 struct nlmsghdr *nlh;
231 struct nfgenmsg *nfmsg;
232 struct sk_buff *entskb = entry->skb;
233 struct net_device *indev;
234 struct net_device *outdev;
236 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
237 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
238 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
239 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
240 #ifdef CONFIG_BRIDGE_NETFILTER
241 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
242 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
244 + nla_total_size(sizeof(u_int32_t)) /* mark */
245 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
246 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
248 outdev = entry->outdev;
250 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
251 case NFQNL_COPY_META:
252 case NFQNL_COPY_NONE:
255 case NFQNL_COPY_PACKET:
256 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
257 skb_checksum_help(entskb))
260 data_len = ACCESS_ONCE(queue->copy_range);
261 if (data_len == 0 || data_len > entskb->len)
262 data_len = entskb->len;
264 size += nla_total_size(data_len);
269 skb = alloc_skb(size, GFP_ATOMIC);
273 old_tail = skb->tail;
274 nlh = NLMSG_PUT(skb, 0, 0,
275 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
276 sizeof(struct nfgenmsg));
277 nfmsg = NLMSG_DATA(nlh);
278 nfmsg->nfgen_family = entry->pf;
279 nfmsg->version = NFNETLINK_V0;
280 nfmsg->res_id = htons(queue->queue_num);
282 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
283 pmsg = nla_data(nla);
284 pmsg->hw_protocol = entskb->protocol;
285 pmsg->hook = entry->hook;
286 *packet_id_ptr = &pmsg->packet_id;
288 indev = entry->indev;
290 #ifndef CONFIG_BRIDGE_NETFILTER
291 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex));
293 if (entry->pf == PF_BRIDGE) {
294 /* Case 1: indev is physical input device, we need to
295 * look for bridge group (when called from
296 * netfilter_bridge) */
297 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
298 htonl(indev->ifindex));
299 /* this is the bridge group "brX" */
300 /* rcu_read_lock()ed by __nf_queue */
301 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
302 htonl(br_port_get_rcu(indev)->br->dev->ifindex));
304 /* Case 2: indev is bridge group, we need to look for
305 * physical device (when called from ipv4) */
306 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
307 htonl(indev->ifindex));
308 if (entskb->nf_bridge && entskb->nf_bridge->physindev)
309 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
310 htonl(entskb->nf_bridge->physindev->ifindex));
316 #ifndef CONFIG_BRIDGE_NETFILTER
317 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex));
319 if (entry->pf == PF_BRIDGE) {
320 /* Case 1: outdev is physical output device, we need to
321 * look for bridge group (when called from
322 * netfilter_bridge) */
323 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
324 htonl(outdev->ifindex));
325 /* this is the bridge group "brX" */
326 /* rcu_read_lock()ed by __nf_queue */
327 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
328 htonl(br_port_get_rcu(outdev)->br->dev->ifindex));
330 /* Case 2: outdev is bridge group, we need to look for
331 * physical output device (when called from ipv4) */
332 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
333 htonl(outdev->ifindex));
334 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev)
335 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
336 htonl(entskb->nf_bridge->physoutdev->ifindex));
342 NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
344 if (indev && entskb->dev) {
345 struct nfqnl_msg_packet_hw phw;
346 int len = dev_parse_header(entskb, phw.hw_addr);
348 phw.hw_addrlen = htons(len);
349 NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
353 if (entskb->tstamp.tv64) {
354 struct nfqnl_msg_packet_timestamp ts;
355 struct timeval tv = ktime_to_timeval(entskb->tstamp);
356 ts.sec = cpu_to_be64(tv.tv_sec);
357 ts.usec = cpu_to_be64(tv.tv_usec);
359 NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
364 int sz = nla_attr_size(data_len);
366 if (skb_tailroom(skb) < nla_total_size(data_len)) {
367 printk(KERN_WARNING "nf_queue: no tailroom!\n");
371 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
372 nla->nla_type = NFQA_PAYLOAD;
375 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
379 nlh->nlmsg_len = skb->tail - old_tail;
387 printk(KERN_ERR "nf_queue: error creating packet message\n");
392 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
394 struct sk_buff *nskb;
395 struct nfqnl_instance *queue;
397 __be32 *packet_id_ptr;
399 /* rcu_read_lock()ed by nf_hook_slow() */
400 queue = instance_lookup(queuenum);
406 if (queue->copy_mode == NFQNL_COPY_NONE) {
411 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
416 spin_lock_bh(&queue->lock);
418 if (!queue->peer_pid) {
420 goto err_out_free_nskb;
422 if (queue->queue_total >= queue->queue_maxlen) {
423 queue->queue_dropped++;
425 printk(KERN_WARNING "nf_queue: full at %d entries, "
426 "dropping packets(s).\n",
428 goto err_out_free_nskb;
430 entry->id = ++queue->id_sequence;
431 *packet_id_ptr = htonl(entry->id);
433 /* nfnetlink_unicast will either free the nskb or add it to a socket */
434 err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT);
436 queue->queue_user_dropped++;
440 __enqueue_entry(queue, entry);
442 spin_unlock_bh(&queue->lock);
448 spin_unlock_bh(&queue->lock);
454 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e)
456 struct sk_buff *nskb;
459 diff = data_len - e->skb->len;
461 if (pskb_trim(e->skb, data_len))
463 } else if (diff > 0) {
464 if (data_len > 0xFFFF)
466 if (diff > skb_tailroom(e->skb)) {
467 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
470 printk(KERN_WARNING "nf_queue: OOM "
471 "in mangle, dropping packet\n");
477 skb_put(e->skb, diff);
479 if (!skb_make_writable(e->skb, data_len))
481 skb_copy_to_linear_data(e->skb, data, data_len);
482 e->skb->ip_summed = CHECKSUM_NONE;
487 nfqnl_set_mode(struct nfqnl_instance *queue,
488 unsigned char mode, unsigned int range)
492 spin_lock_bh(&queue->lock);
494 case NFQNL_COPY_NONE:
495 case NFQNL_COPY_META:
496 queue->copy_mode = mode;
497 queue->copy_range = 0;
500 case NFQNL_COPY_PACKET:
501 queue->copy_mode = mode;
502 /* we're using struct nlattr which has 16bit nla_len */
504 queue->copy_range = 0xffff;
506 queue->copy_range = range;
513 spin_unlock_bh(&queue->lock);
519 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
522 if (entry->indev->ifindex == ifindex)
525 if (entry->outdev->ifindex == ifindex)
527 #ifdef CONFIG_BRIDGE_NETFILTER
528 if (entry->skb->nf_bridge) {
529 if (entry->skb->nf_bridge->physindev &&
530 entry->skb->nf_bridge->physindev->ifindex == ifindex)
532 if (entry->skb->nf_bridge->physoutdev &&
533 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
540 /* drop all packets with either indev or outdev == ifindex from all queue
543 nfqnl_dev_drop(int ifindex)
549 for (i = 0; i < INSTANCE_BUCKETS; i++) {
550 struct hlist_node *tmp;
551 struct nfqnl_instance *inst;
552 struct hlist_head *head = &instance_table[i];
554 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
555 nfqnl_flush(inst, dev_cmp, ifindex);
561 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
564 nfqnl_rcv_dev_event(struct notifier_block *this,
565 unsigned long event, void *ptr)
567 struct net_device *dev = ptr;
569 if (!net_eq(dev_net(dev), &init_net))
572 /* Drop any packets associated with the downed device */
573 if (event == NETDEV_DOWN)
574 nfqnl_dev_drop(dev->ifindex);
578 static struct notifier_block nfqnl_dev_notifier = {
579 .notifier_call = nfqnl_rcv_dev_event,
583 nfqnl_rcv_nl_event(struct notifier_block *this,
584 unsigned long event, void *ptr)
586 struct netlink_notify *n = ptr;
588 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
591 /* destroy all instances for this pid */
592 spin_lock(&instances_lock);
593 for (i = 0; i < INSTANCE_BUCKETS; i++) {
594 struct hlist_node *tmp, *t2;
595 struct nfqnl_instance *inst;
596 struct hlist_head *head = &instance_table[i];
598 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
599 if ((n->net == &init_net) &&
600 (n->pid == inst->peer_pid))
601 __instance_destroy(inst);
604 spin_unlock(&instances_lock);
609 static struct notifier_block nfqnl_rtnl_notifier = {
610 .notifier_call = nfqnl_rcv_nl_event,
613 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
614 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
615 [NFQA_MARK] = { .type = NLA_U32 },
616 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
619 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
620 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
621 [NFQA_MARK] = { .type = NLA_U32 },
624 static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlpid)
626 struct nfqnl_instance *queue;
628 queue = instance_lookup(queue_num);
630 return ERR_PTR(-ENODEV);
632 if (queue->peer_pid != nlpid)
633 return ERR_PTR(-EPERM);
638 static struct nfqnl_msg_verdict_hdr*
639 verdicthdr_get(const struct nlattr * const nfqa[])
641 struct nfqnl_msg_verdict_hdr *vhdr;
642 unsigned int verdict;
644 if (!nfqa[NFQA_VERDICT_HDR])
647 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
648 verdict = ntohl(vhdr->verdict);
649 if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT)
654 static int nfq_id_after(unsigned int id, unsigned int max)
656 return (int)(id - max) > 0;
660 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
661 const struct nlmsghdr *nlh,
662 const struct nlattr * const nfqa[])
664 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
665 struct nf_queue_entry *entry, *tmp;
666 unsigned int verdict, maxid;
667 struct nfqnl_msg_verdict_hdr *vhdr;
668 struct nfqnl_instance *queue;
669 LIST_HEAD(batch_list);
670 u16 queue_num = ntohs(nfmsg->res_id);
672 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
674 return PTR_ERR(queue);
676 vhdr = verdicthdr_get(nfqa);
680 verdict = ntohl(vhdr->verdict);
681 maxid = ntohl(vhdr->id);
683 spin_lock_bh(&queue->lock);
685 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
686 if (nfq_id_after(entry->id, maxid))
688 __dequeue_entry(queue, entry);
689 list_add_tail(&entry->list, &batch_list);
692 spin_unlock_bh(&queue->lock);
694 if (list_empty(&batch_list))
697 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
699 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
700 nf_reinject(entry, verdict);
706 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
707 const struct nlmsghdr *nlh,
708 const struct nlattr * const nfqa[])
710 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
711 u_int16_t queue_num = ntohs(nfmsg->res_id);
713 struct nfqnl_msg_verdict_hdr *vhdr;
714 struct nfqnl_instance *queue;
715 unsigned int verdict;
716 struct nf_queue_entry *entry;
718 queue = instance_lookup(queue_num);
721 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).pid);
723 return PTR_ERR(queue);
725 vhdr = verdicthdr_get(nfqa);
729 verdict = ntohl(vhdr->verdict);
731 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
735 if (nfqa[NFQA_PAYLOAD]) {
736 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
737 nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0)
742 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
744 nf_reinject(entry, verdict);
749 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
750 const struct nlmsghdr *nlh,
751 const struct nlattr * const nfqa[])
756 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
757 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
758 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
761 static const struct nf_queue_handler nfqh = {
763 .outfn = &nfqnl_enqueue_packet,
767 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
768 const struct nlmsghdr *nlh,
769 const struct nlattr * const nfqa[])
771 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
772 u_int16_t queue_num = ntohs(nfmsg->res_id);
773 struct nfqnl_instance *queue;
774 struct nfqnl_msg_config_cmd *cmd = NULL;
777 if (nfqa[NFQA_CFG_CMD]) {
778 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
780 /* Commands without queue context - might sleep */
781 switch (cmd->command) {
782 case NFQNL_CFG_CMD_PF_BIND:
783 return nf_register_queue_handler(ntohs(cmd->pf),
785 case NFQNL_CFG_CMD_PF_UNBIND:
786 return nf_unregister_queue_handler(ntohs(cmd->pf),
792 queue = instance_lookup(queue_num);
793 if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
799 switch (cmd->command) {
800 case NFQNL_CFG_CMD_BIND:
805 queue = instance_create(queue_num, NETLINK_CB(skb).pid);
807 ret = PTR_ERR(queue);
811 case NFQNL_CFG_CMD_UNBIND:
816 instance_destroy(queue);
818 case NFQNL_CFG_CMD_PF_BIND:
819 case NFQNL_CFG_CMD_PF_UNBIND:
827 if (nfqa[NFQA_CFG_PARAMS]) {
828 struct nfqnl_msg_config_params *params;
834 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
835 nfqnl_set_mode(queue, params->copy_mode,
836 ntohl(params->copy_range));
839 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
840 __be32 *queue_maxlen;
846 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
847 spin_lock_bh(&queue->lock);
848 queue->queue_maxlen = ntohl(*queue_maxlen);
849 spin_unlock_bh(&queue->lock);
857 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
858 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
859 .attr_count = NFQA_MAX, },
860 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
861 .attr_count = NFQA_MAX,
862 .policy = nfqa_verdict_policy },
863 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
864 .attr_count = NFQA_CFG_MAX,
865 .policy = nfqa_cfg_policy },
866 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
867 .attr_count = NFQA_MAX,
868 .policy = nfqa_verdict_batch_policy },
871 static const struct nfnetlink_subsystem nfqnl_subsys = {
873 .subsys_id = NFNL_SUBSYS_QUEUE,
874 .cb_count = NFQNL_MSG_MAX,
878 #ifdef CONFIG_PROC_FS
883 static struct hlist_node *get_first(struct seq_file *seq)
885 struct iter_state *st = seq->private;
890 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
891 if (!hlist_empty(&instance_table[st->bucket]))
892 return instance_table[st->bucket].first;
897 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
899 struct iter_state *st = seq->private;
903 if (++st->bucket >= INSTANCE_BUCKETS)
906 h = instance_table[st->bucket].first;
911 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
913 struct hlist_node *head;
914 head = get_first(seq);
917 while (pos && (head = get_next(seq, head)))
919 return pos ? NULL : head;
922 static void *seq_start(struct seq_file *seq, loff_t *pos)
923 __acquires(instances_lock)
925 spin_lock(&instances_lock);
926 return get_idx(seq, *pos);
929 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
932 return get_next(s, v);
935 static void seq_stop(struct seq_file *s, void *v)
936 __releases(instances_lock)
938 spin_unlock(&instances_lock);
941 static int seq_show(struct seq_file *s, void *v)
943 const struct nfqnl_instance *inst = v;
945 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
947 inst->peer_pid, inst->queue_total,
948 inst->copy_mode, inst->copy_range,
949 inst->queue_dropped, inst->queue_user_dropped,
950 inst->id_sequence, 1);
953 static const struct seq_operations nfqnl_seq_ops = {
960 static int nfqnl_open(struct inode *inode, struct file *file)
962 return seq_open_private(file, &nfqnl_seq_ops,
963 sizeof(struct iter_state));
966 static const struct file_operations nfqnl_file_ops = {
967 .owner = THIS_MODULE,
971 .release = seq_release_private,
976 static int __init nfnetlink_queue_init(void)
978 int i, status = -ENOMEM;
980 for (i = 0; i < INSTANCE_BUCKETS; i++)
981 INIT_HLIST_HEAD(&instance_table[i]);
983 netlink_register_notifier(&nfqnl_rtnl_notifier);
984 status = nfnetlink_subsys_register(&nfqnl_subsys);
986 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
987 goto cleanup_netlink_notifier;
990 #ifdef CONFIG_PROC_FS
991 if (!proc_create("nfnetlink_queue", 0440,
992 proc_net_netfilter, &nfqnl_file_ops))
996 register_netdevice_notifier(&nfqnl_dev_notifier);
999 #ifdef CONFIG_PROC_FS
1001 nfnetlink_subsys_unregister(&nfqnl_subsys);
1003 cleanup_netlink_notifier:
1004 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1008 static void __exit nfnetlink_queue_fini(void)
1010 nf_unregister_queue_handlers(&nfqh);
1011 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1012 #ifdef CONFIG_PROC_FS
1013 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
1015 nfnetlink_subsys_unregister(&nfqnl_subsys);
1016 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1018 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1021 MODULE_DESCRIPTION("netfilter packet queue handler");
1022 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1023 MODULE_LICENSE("GPL");
1024 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1026 module_init(nfnetlink_queue_init);
1027 module_exit(nfnetlink_queue_fini);