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);