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>
33 #include <net/netfilter/nfnetlink_queue.h>
35 #include <linux/atomic.h>
37 #ifdef CONFIG_BRIDGE_NETFILTER
38 #include "../bridge/br_private.h"
41 #define NFQNL_QMAX_DEFAULT 1024
43 struct nfqnl_instance {
44 struct hlist_node hlist; /* global list of queues */
48 unsigned int queue_maxlen;
49 unsigned int copy_range;
50 unsigned int queue_dropped;
51 unsigned int queue_user_dropped;
54 u_int16_t queue_num; /* number of this queue */
56 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
58 * Following fields are dirtied for each queued packet,
59 * keep them in same cache line if possible.
62 unsigned int queue_total;
63 unsigned int id_sequence; /* 'sequence' of pkt ids */
64 struct list_head queue_list; /* packets in queue */
67 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
69 static DEFINE_SPINLOCK(instances_lock);
71 #define INSTANCE_BUCKETS 16
72 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
74 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
76 return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
79 static struct nfqnl_instance *
80 instance_lookup(u_int16_t queue_num)
82 struct hlist_head *head;
83 struct hlist_node *pos;
84 struct nfqnl_instance *inst;
86 head = &instance_table[instance_hashfn(queue_num)];
87 hlist_for_each_entry_rcu(inst, pos, head, hlist) {
88 if (inst->queue_num == queue_num)
94 static struct nfqnl_instance *
95 instance_create(u_int16_t queue_num, int portid)
97 struct nfqnl_instance *inst;
101 spin_lock(&instances_lock);
102 if (instance_lookup(queue_num)) {
107 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
113 inst->queue_num = queue_num;
114 inst->peer_portid = portid;
115 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
116 inst->copy_range = 0xfffff;
117 inst->copy_mode = NFQNL_COPY_NONE;
118 spin_lock_init(&inst->lock);
119 INIT_LIST_HEAD(&inst->queue_list);
121 if (!try_module_get(THIS_MODULE)) {
126 h = instance_hashfn(queue_num);
127 hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
129 spin_unlock(&instances_lock);
136 spin_unlock(&instances_lock);
140 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
144 instance_destroy_rcu(struct rcu_head *head)
146 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
149 nfqnl_flush(inst, NULL, 0);
151 module_put(THIS_MODULE);
155 __instance_destroy(struct nfqnl_instance *inst)
157 hlist_del_rcu(&inst->hlist);
158 call_rcu(&inst->rcu, instance_destroy_rcu);
162 instance_destroy(struct nfqnl_instance *inst)
164 spin_lock(&instances_lock);
165 __instance_destroy(inst);
166 spin_unlock(&instances_lock);
170 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
172 list_add_tail(&entry->list, &queue->queue_list);
173 queue->queue_total++;
177 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
179 list_del(&entry->list);
180 queue->queue_total--;
183 static struct nf_queue_entry *
184 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
186 struct nf_queue_entry *entry = NULL, *i;
188 spin_lock_bh(&queue->lock);
190 list_for_each_entry(i, &queue->queue_list, list) {
198 __dequeue_entry(queue, entry);
200 spin_unlock_bh(&queue->lock);
206 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
208 struct nf_queue_entry *entry, *next;
210 spin_lock_bh(&queue->lock);
211 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
212 if (!cmpfn || cmpfn(entry, data)) {
213 list_del(&entry->list);
214 queue->queue_total--;
215 nf_reinject(entry, NF_DROP);
218 spin_unlock_bh(&queue->lock);
221 static struct sk_buff *
222 nfqnl_build_packet_message(struct nfqnl_instance *queue,
223 struct nf_queue_entry *entry,
224 __be32 **packet_id_ptr)
226 sk_buff_data_t old_tail;
231 struct nfqnl_msg_packet_hdr *pmsg;
232 struct nlmsghdr *nlh;
233 struct nfgenmsg *nfmsg;
234 struct sk_buff *entskb = entry->skb;
235 struct net_device *indev;
236 struct net_device *outdev;
237 struct nf_conn *ct = NULL;
238 enum ip_conntrack_info uninitialized_var(ctinfo);
240 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
241 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
242 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
243 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
244 #ifdef CONFIG_BRIDGE_NETFILTER
245 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
246 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
248 + nla_total_size(sizeof(u_int32_t)) /* mark */
249 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
250 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
252 outdev = entry->outdev;
254 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
255 case NFQNL_COPY_META:
256 case NFQNL_COPY_NONE:
259 case NFQNL_COPY_PACKET:
260 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
261 skb_checksum_help(entskb))
264 data_len = ACCESS_ONCE(queue->copy_range);
265 if (data_len == 0 || data_len > entskb->len)
266 data_len = entskb->len;
268 size += nla_total_size(data_len);
272 if (queue->flags & NFQA_CFG_F_CONNTRACK)
273 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
275 skb = alloc_skb(size, GFP_ATOMIC);
279 old_tail = skb->tail;
280 nlh = nlmsg_put(skb, 0, 0,
281 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
282 sizeof(struct nfgenmsg), 0);
287 nfmsg = nlmsg_data(nlh);
288 nfmsg->nfgen_family = entry->pf;
289 nfmsg->version = NFNETLINK_V0;
290 nfmsg->res_id = htons(queue->queue_num);
292 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
293 pmsg = nla_data(nla);
294 pmsg->hw_protocol = entskb->protocol;
295 pmsg->hook = entry->hook;
296 *packet_id_ptr = &pmsg->packet_id;
298 indev = entry->indev;
300 #ifndef CONFIG_BRIDGE_NETFILTER
301 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
302 goto nla_put_failure;
304 if (entry->pf == PF_BRIDGE) {
305 /* Case 1: indev is physical input device, we need to
306 * look for bridge group (when called from
307 * netfilter_bridge) */
308 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
309 htonl(indev->ifindex)) ||
310 /* this is the bridge group "brX" */
311 /* rcu_read_lock()ed by __nf_queue */
312 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
313 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
314 goto nla_put_failure;
316 /* Case 2: indev is bridge group, we need to look for
317 * physical device (when called from ipv4) */
318 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
319 htonl(indev->ifindex)))
320 goto nla_put_failure;
321 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
322 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
323 htonl(entskb->nf_bridge->physindev->ifindex)))
324 goto nla_put_failure;
330 #ifndef CONFIG_BRIDGE_NETFILTER
331 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
332 goto nla_put_failure;
334 if (entry->pf == PF_BRIDGE) {
335 /* Case 1: outdev is physical output device, we need to
336 * look for bridge group (when called from
337 * netfilter_bridge) */
338 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
339 htonl(outdev->ifindex)) ||
340 /* this is the bridge group "brX" */
341 /* rcu_read_lock()ed by __nf_queue */
342 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
343 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
344 goto nla_put_failure;
346 /* Case 2: outdev is bridge group, we need to look for
347 * physical output device (when called from ipv4) */
348 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
349 htonl(outdev->ifindex)))
350 goto nla_put_failure;
351 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
352 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
353 htonl(entskb->nf_bridge->physoutdev->ifindex)))
354 goto nla_put_failure;
360 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
361 goto nla_put_failure;
363 if (indev && entskb->dev &&
364 entskb->mac_header != entskb->network_header) {
365 struct nfqnl_msg_packet_hw phw;
366 int len = dev_parse_header(entskb, phw.hw_addr);
368 phw.hw_addrlen = htons(len);
369 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
370 goto nla_put_failure;
374 if (entskb->tstamp.tv64) {
375 struct nfqnl_msg_packet_timestamp ts;
376 struct timeval tv = ktime_to_timeval(entskb->tstamp);
377 ts.sec = cpu_to_be64(tv.tv_sec);
378 ts.usec = cpu_to_be64(tv.tv_usec);
380 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
381 goto nla_put_failure;
386 int sz = nla_attr_size(data_len);
388 if (skb_tailroom(skb) < nla_total_size(data_len)) {
389 printk(KERN_WARNING "nf_queue: no tailroom!\n");
394 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
395 nla->nla_type = NFQA_PAYLOAD;
398 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
402 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
403 goto nla_put_failure;
405 nlh->nlmsg_len = skb->tail - old_tail;
410 net_err_ratelimited("nf_queue: error creating packet message\n");
415 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
417 struct sk_buff *nskb;
418 struct nfqnl_instance *queue;
420 __be32 *packet_id_ptr;
423 /* rcu_read_lock()ed by nf_hook_slow() */
424 queue = instance_lookup(queuenum);
430 if (queue->copy_mode == NFQNL_COPY_NONE) {
435 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
440 spin_lock_bh(&queue->lock);
442 if (!queue->peer_portid) {
444 goto err_out_free_nskb;
446 if (queue->queue_total >= queue->queue_maxlen) {
447 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
451 queue->queue_dropped++;
452 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
455 goto err_out_free_nskb;
457 entry->id = ++queue->id_sequence;
458 *packet_id_ptr = htonl(entry->id);
460 /* nfnetlink_unicast will either free the nskb or add it to a socket */
461 err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT);
463 queue->queue_user_dropped++;
467 __enqueue_entry(queue, entry);
469 spin_unlock_bh(&queue->lock);
475 spin_unlock_bh(&queue->lock);
477 nf_reinject(entry, NF_ACCEPT);
483 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
485 struct sk_buff *nskb;
488 if (pskb_trim(e->skb, data_len))
490 } else if (diff > 0) {
491 if (data_len > 0xFFFF)
493 if (diff > skb_tailroom(e->skb)) {
494 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
497 printk(KERN_WARNING "nf_queue: OOM "
498 "in mangle, dropping packet\n");
504 skb_put(e->skb, diff);
506 if (!skb_make_writable(e->skb, data_len))
508 skb_copy_to_linear_data(e->skb, data, data_len);
509 e->skb->ip_summed = CHECKSUM_NONE;
514 nfqnl_set_mode(struct nfqnl_instance *queue,
515 unsigned char mode, unsigned int range)
519 spin_lock_bh(&queue->lock);
521 case NFQNL_COPY_NONE:
522 case NFQNL_COPY_META:
523 queue->copy_mode = mode;
524 queue->copy_range = 0;
527 case NFQNL_COPY_PACKET:
528 queue->copy_mode = mode;
529 /* we're using struct nlattr which has 16bit nla_len */
531 queue->copy_range = 0xffff;
533 queue->copy_range = range;
540 spin_unlock_bh(&queue->lock);
546 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
549 if (entry->indev->ifindex == ifindex)
552 if (entry->outdev->ifindex == ifindex)
554 #ifdef CONFIG_BRIDGE_NETFILTER
555 if (entry->skb->nf_bridge) {
556 if (entry->skb->nf_bridge->physindev &&
557 entry->skb->nf_bridge->physindev->ifindex == ifindex)
559 if (entry->skb->nf_bridge->physoutdev &&
560 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
567 /* drop all packets with either indev or outdev == ifindex from all queue
570 nfqnl_dev_drop(int ifindex)
576 for (i = 0; i < INSTANCE_BUCKETS; i++) {
577 struct hlist_node *tmp;
578 struct nfqnl_instance *inst;
579 struct hlist_head *head = &instance_table[i];
581 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
582 nfqnl_flush(inst, dev_cmp, ifindex);
588 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
591 nfqnl_rcv_dev_event(struct notifier_block *this,
592 unsigned long event, void *ptr)
594 struct net_device *dev = ptr;
596 if (!net_eq(dev_net(dev), &init_net))
599 /* Drop any packets associated with the downed device */
600 if (event == NETDEV_DOWN)
601 nfqnl_dev_drop(dev->ifindex);
605 static struct notifier_block nfqnl_dev_notifier = {
606 .notifier_call = nfqnl_rcv_dev_event,
610 nfqnl_rcv_nl_event(struct notifier_block *this,
611 unsigned long event, void *ptr)
613 struct netlink_notify *n = ptr;
615 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
618 /* destroy all instances for this portid */
619 spin_lock(&instances_lock);
620 for (i = 0; i < INSTANCE_BUCKETS; i++) {
621 struct hlist_node *tmp, *t2;
622 struct nfqnl_instance *inst;
623 struct hlist_head *head = &instance_table[i];
625 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
626 if ((n->net == &init_net) &&
627 (n->portid == inst->peer_portid))
628 __instance_destroy(inst);
631 spin_unlock(&instances_lock);
636 static struct notifier_block nfqnl_rtnl_notifier = {
637 .notifier_call = nfqnl_rcv_nl_event,
640 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
641 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
642 [NFQA_MARK] = { .type = NLA_U32 },
643 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
644 [NFQA_CT] = { .type = NLA_UNSPEC },
647 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
648 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
649 [NFQA_MARK] = { .type = NLA_U32 },
652 static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid)
654 struct nfqnl_instance *queue;
656 queue = instance_lookup(queue_num);
658 return ERR_PTR(-ENODEV);
660 if (queue->peer_portid != nlportid)
661 return ERR_PTR(-EPERM);
666 static struct nfqnl_msg_verdict_hdr*
667 verdicthdr_get(const struct nlattr * const nfqa[])
669 struct nfqnl_msg_verdict_hdr *vhdr;
670 unsigned int verdict;
672 if (!nfqa[NFQA_VERDICT_HDR])
675 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
676 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
677 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
682 static int nfq_id_after(unsigned int id, unsigned int max)
684 return (int)(id - max) > 0;
688 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
689 const struct nlmsghdr *nlh,
690 const struct nlattr * const nfqa[])
692 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
693 struct nf_queue_entry *entry, *tmp;
694 unsigned int verdict, maxid;
695 struct nfqnl_msg_verdict_hdr *vhdr;
696 struct nfqnl_instance *queue;
697 LIST_HEAD(batch_list);
698 u16 queue_num = ntohs(nfmsg->res_id);
700 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
702 return PTR_ERR(queue);
704 vhdr = verdicthdr_get(nfqa);
708 verdict = ntohl(vhdr->verdict);
709 maxid = ntohl(vhdr->id);
711 spin_lock_bh(&queue->lock);
713 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
714 if (nfq_id_after(entry->id, maxid))
716 __dequeue_entry(queue, entry);
717 list_add_tail(&entry->list, &batch_list);
720 spin_unlock_bh(&queue->lock);
722 if (list_empty(&batch_list))
725 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
727 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
728 nf_reinject(entry, verdict);
734 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
735 const struct nlmsghdr *nlh,
736 const struct nlattr * const nfqa[])
738 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
739 u_int16_t queue_num = ntohs(nfmsg->res_id);
741 struct nfqnl_msg_verdict_hdr *vhdr;
742 struct nfqnl_instance *queue;
743 unsigned int verdict;
744 struct nf_queue_entry *entry;
745 enum ip_conntrack_info uninitialized_var(ctinfo);
746 struct nf_conn *ct = NULL;
748 queue = instance_lookup(queue_num);
751 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
753 return PTR_ERR(queue);
755 vhdr = verdicthdr_get(nfqa);
759 verdict = ntohl(vhdr->verdict);
761 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
766 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
767 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
769 if (nfqa[NFQA_PAYLOAD]) {
770 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
771 int diff = payload_len - entry->skb->len;
773 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
774 payload_len, entry, diff) < 0)
778 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
783 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
785 nf_reinject(entry, verdict);
790 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
791 const struct nlmsghdr *nlh,
792 const struct nlattr * const nfqa[])
797 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
798 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
799 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
802 static const struct nf_queue_handler nfqh = {
804 .outfn = &nfqnl_enqueue_packet,
808 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
809 const struct nlmsghdr *nlh,
810 const struct nlattr * const nfqa[])
812 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
813 u_int16_t queue_num = ntohs(nfmsg->res_id);
814 struct nfqnl_instance *queue;
815 struct nfqnl_msg_config_cmd *cmd = NULL;
818 if (nfqa[NFQA_CFG_CMD]) {
819 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
821 /* Commands without queue context - might sleep */
822 switch (cmd->command) {
823 case NFQNL_CFG_CMD_PF_BIND:
824 return nf_register_queue_handler(ntohs(cmd->pf),
826 case NFQNL_CFG_CMD_PF_UNBIND:
827 return nf_unregister_queue_handler(ntohs(cmd->pf),
833 queue = instance_lookup(queue_num);
834 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
840 switch (cmd->command) {
841 case NFQNL_CFG_CMD_BIND:
846 queue = instance_create(queue_num, NETLINK_CB(skb).portid);
848 ret = PTR_ERR(queue);
852 case NFQNL_CFG_CMD_UNBIND:
857 instance_destroy(queue);
859 case NFQNL_CFG_CMD_PF_BIND:
860 case NFQNL_CFG_CMD_PF_UNBIND:
868 if (nfqa[NFQA_CFG_PARAMS]) {
869 struct nfqnl_msg_config_params *params;
875 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
876 nfqnl_set_mode(queue, params->copy_mode,
877 ntohl(params->copy_range));
880 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
881 __be32 *queue_maxlen;
887 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
888 spin_lock_bh(&queue->lock);
889 queue->queue_maxlen = ntohl(*queue_maxlen);
890 spin_unlock_bh(&queue->lock);
893 if (nfqa[NFQA_CFG_FLAGS]) {
901 if (!nfqa[NFQA_CFG_MASK]) {
902 /* A mask is needed to specify which flags are being
909 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
910 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
912 if (flags >= NFQA_CFG_F_MAX) {
917 spin_lock_bh(&queue->lock);
918 queue->flags &= ~mask;
919 queue->flags |= flags & mask;
920 spin_unlock_bh(&queue->lock);
928 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
929 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
930 .attr_count = NFQA_MAX, },
931 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
932 .attr_count = NFQA_MAX,
933 .policy = nfqa_verdict_policy },
934 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
935 .attr_count = NFQA_CFG_MAX,
936 .policy = nfqa_cfg_policy },
937 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
938 .attr_count = NFQA_MAX,
939 .policy = nfqa_verdict_batch_policy },
942 static const struct nfnetlink_subsystem nfqnl_subsys = {
944 .subsys_id = NFNL_SUBSYS_QUEUE,
945 .cb_count = NFQNL_MSG_MAX,
949 #ifdef CONFIG_PROC_FS
954 static struct hlist_node *get_first(struct seq_file *seq)
956 struct iter_state *st = seq->private;
961 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
962 if (!hlist_empty(&instance_table[st->bucket]))
963 return instance_table[st->bucket].first;
968 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
970 struct iter_state *st = seq->private;
974 if (++st->bucket >= INSTANCE_BUCKETS)
977 h = instance_table[st->bucket].first;
982 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
984 struct hlist_node *head;
985 head = get_first(seq);
988 while (pos && (head = get_next(seq, head)))
990 return pos ? NULL : head;
993 static void *seq_start(struct seq_file *seq, loff_t *pos)
994 __acquires(instances_lock)
996 spin_lock(&instances_lock);
997 return get_idx(seq, *pos);
1000 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1003 return get_next(s, v);
1006 static void seq_stop(struct seq_file *s, void *v)
1007 __releases(instances_lock)
1009 spin_unlock(&instances_lock);
1012 static int seq_show(struct seq_file *s, void *v)
1014 const struct nfqnl_instance *inst = v;
1016 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1018 inst->peer_portid, inst->queue_total,
1019 inst->copy_mode, inst->copy_range,
1020 inst->queue_dropped, inst->queue_user_dropped,
1021 inst->id_sequence, 1);
1024 static const struct seq_operations nfqnl_seq_ops = {
1031 static int nfqnl_open(struct inode *inode, struct file *file)
1033 return seq_open_private(file, &nfqnl_seq_ops,
1034 sizeof(struct iter_state));
1037 static const struct file_operations nfqnl_file_ops = {
1038 .owner = THIS_MODULE,
1041 .llseek = seq_lseek,
1042 .release = seq_release_private,
1045 #endif /* PROC_FS */
1047 static int __init nfnetlink_queue_init(void)
1049 int i, status = -ENOMEM;
1051 for (i = 0; i < INSTANCE_BUCKETS; i++)
1052 INIT_HLIST_HEAD(&instance_table[i]);
1054 netlink_register_notifier(&nfqnl_rtnl_notifier);
1055 status = nfnetlink_subsys_register(&nfqnl_subsys);
1057 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
1058 goto cleanup_netlink_notifier;
1061 #ifdef CONFIG_PROC_FS
1062 if (!proc_create("nfnetlink_queue", 0440,
1063 proc_net_netfilter, &nfqnl_file_ops))
1064 goto cleanup_subsys;
1067 register_netdevice_notifier(&nfqnl_dev_notifier);
1070 #ifdef CONFIG_PROC_FS
1072 nfnetlink_subsys_unregister(&nfqnl_subsys);
1074 cleanup_netlink_notifier:
1075 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1079 static void __exit nfnetlink_queue_fini(void)
1081 nf_unregister_queue_handlers(&nfqh);
1082 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1083 #ifdef CONFIG_PROC_FS
1084 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
1086 nfnetlink_subsys_unregister(&nfqnl_subsys);
1087 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1089 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1092 MODULE_DESCRIPTION("netfilter packet queue handler");
1093 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1094 MODULE_LICENSE("GPL");
1095 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1097 module_init(nfnetlink_queue_init);
1098 module_exit(nfnetlink_queue_fini);