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Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
[linux-2.6.git] / net / netfilter / nfnetlink_queue_core.c
blob971ea145ab3ea33a2d42ad0cf66e7025c1457832
1 /*
2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
4 *
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
7 *
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>
11 *
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.
15 *
16 */
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>
31 #include <net/sock.h>
32 #include <net/netfilter/nf_queue.h>
33 #include <net/netns/generic.h>
34 #include <net/netfilter/nfnetlink_queue.h>
35
36 #include <linux/atomic.h>
37
38 #ifdef CONFIG_BRIDGE_NETFILTER
39 #include "../bridge/br_private.h"
40 #endif
41
42 #define NFQNL_QMAX_DEFAULT 1024
43
44 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
45 * includes the header length. Thus, the maximum packet length that we
46 * support is 65531 bytes. We send truncated packets if the specified length
47 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
48 * attribute to detect truncation.
49 */
50 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
51
52 struct nfqnl_instance {
53 struct hlist_node hlist; /* global list of queues */
54 struct rcu_head rcu;
55
56 int peer_portid;
57 unsigned int queue_maxlen;
58 unsigned int copy_range;
59 unsigned int queue_dropped;
60 unsigned int queue_user_dropped;
61
62
63 u_int16_t queue_num; /* number of this queue */
64 u_int8_t copy_mode;
65 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
66 /*
67 * Following fields are dirtied for each queued packet,
68 * keep them in same cache line if possible.
69 */
70 spinlock_t lock;
71 unsigned int queue_total;
72 unsigned int id_sequence; /* 'sequence' of pkt ids */
73 struct list_head queue_list; /* packets in queue */
74 };
75
76 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
77
78 static int nfnl_queue_net_id __read_mostly;
79
80 #define INSTANCE_BUCKETS 16
81 struct nfnl_queue_net {
82 spinlock_t instances_lock;
83 struct hlist_head instance_table[INSTANCE_BUCKETS];
84 };
85
86 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
87 {
88 return net_generic(net, nfnl_queue_net_id);
89 }
90
91 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
92 {
93 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
94 }
95
96 static struct nfqnl_instance *
97 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
98 {
99 struct hlist_head *head;
100 struct nfqnl_instance *inst;
101
102 head = &q->instance_table[instance_hashfn(queue_num)];
103 hlist_for_each_entry_rcu(inst, head, hlist) {
104 if (inst->queue_num == queue_num)
105 return inst;
106 }
107 return NULL;
108 }
109
110 static struct nfqnl_instance *
111 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
112 int portid)
113 {
114 struct nfqnl_instance *inst;
115 unsigned int h;
116 int err;
117
118 spin_lock(&q->instances_lock);
119 if (instance_lookup(q, queue_num)) {
120 err = -EEXIST;
121 goto out_unlock;
122 }
123
124 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
125 if (!inst) {
126 err = -ENOMEM;
127 goto out_unlock;
128 }
129
130 inst->queue_num = queue_num;
131 inst->peer_portid = portid;
132 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
133 inst->copy_range = NFQNL_MAX_COPY_RANGE;
134 inst->copy_mode = NFQNL_COPY_NONE;
135 spin_lock_init(&inst->lock);
136 INIT_LIST_HEAD(&inst->queue_list);
137
138 if (!try_module_get(THIS_MODULE)) {
139 err = -EAGAIN;
140 goto out_free;
141 }
142
143 h = instance_hashfn(queue_num);
144 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
145
146 spin_unlock(&q->instances_lock);
147
148 return inst;
149
150 out_free:
151 kfree(inst);
152 out_unlock:
153 spin_unlock(&q->instances_lock);
154 return ERR_PTR(err);
155 }
156
157 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
158 unsigned long data);
159
160 static void
161 instance_destroy_rcu(struct rcu_head *head)
162 {
163 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
164 rcu);
165
166 nfqnl_flush(inst, NULL, 0);
167 kfree(inst);
168 module_put(THIS_MODULE);
169 }
170
171 static void
172 __instance_destroy(struct nfqnl_instance *inst)
173 {
174 hlist_del_rcu(&inst->hlist);
175 call_rcu(&inst->rcu, instance_destroy_rcu);
176 }
177
178 static void
179 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
180 {
181 spin_lock(&q->instances_lock);
182 __instance_destroy(inst);
183 spin_unlock(&q->instances_lock);
184 }
185
186 static inline void
187 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
188 {
189 list_add_tail(&entry->list, &queue->queue_list);
190 queue->queue_total++;
191 }
192
193 static void
194 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
195 {
196 list_del(&entry->list);
197 queue->queue_total--;
198 }
199
200 static struct nf_queue_entry *
201 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
202 {
203 struct nf_queue_entry *entry = NULL, *i;
204
205 spin_lock_bh(&queue->lock);
206
207 list_for_each_entry(i, &queue->queue_list, list) {
208 if (i->id == id) {
209 entry = i;
210 break;
211 }
212 }
213
214 if (entry)
215 __dequeue_entry(queue, entry);
216
217 spin_unlock_bh(&queue->lock);
218
219 return entry;
220 }
221
222 static void
223 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
224 {
225 struct nf_queue_entry *entry, *next;
226
227 spin_lock_bh(&queue->lock);
228 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
229 if (!cmpfn || cmpfn(entry, data)) {
230 list_del(&entry->list);
231 queue->queue_total--;
232 nf_reinject(entry, NF_DROP);
233 }
234 }
235 spin_unlock_bh(&queue->lock);
236 }
237
238 static void
239 nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
240 {
241 int i, j = 0;
242 int plen = 0; /* length of skb->head fragment */
243 struct page *page;
244 unsigned int offset;
245
246 /* dont bother with small payloads */
247 if (len <= skb_tailroom(to)) {
248 skb_copy_bits(from, 0, skb_put(to, len), len);
249 return;
250 }
251
252 if (hlen) {
253 skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
254 len -= hlen;
255 } else {
256 plen = min_t(int, skb_headlen(from), len);
257 if (plen) {
258 page = virt_to_head_page(from->head);
259 offset = from->data - (unsigned char *)page_address(page);
260 __skb_fill_page_desc(to, 0, page, offset, plen);
261 get_page(page);
262 j = 1;
263 len -= plen;
264 }
265 }
266
267 to->truesize += len + plen;
268 to->len += len + plen;
269 to->data_len += len + plen;
270
271 for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
272 if (!len)
273 break;
274 skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
275 skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
276 len -= skb_shinfo(to)->frags[j].size;
277 skb_frag_ref(to, j);
278 j++;
279 }
280 skb_shinfo(to)->nr_frags = j;
281 }
282
283 static int
284 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
285 bool csum_verify)
286 {
287 __u32 flags = 0;
288
289 if (packet->ip_summed == CHECKSUM_PARTIAL)
290 flags = NFQA_SKB_CSUMNOTREADY;
291 else if (csum_verify)
292 flags = NFQA_SKB_CSUM_NOTVERIFIED;
293
294 if (skb_is_gso(packet))
295 flags |= NFQA_SKB_GSO;
296
297 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
298 }
299
300 static struct sk_buff *
301 nfqnl_build_packet_message(struct nfqnl_instance *queue,
302 struct nf_queue_entry *entry,
303 __be32 **packet_id_ptr)
304 {
305 size_t size;
306 size_t data_len = 0, cap_len = 0;
307 int hlen = 0;
308 struct sk_buff *skb;
309 struct nlattr *nla;
310 struct nfqnl_msg_packet_hdr *pmsg;
311 struct nlmsghdr *nlh;
312 struct nfgenmsg *nfmsg;
313 struct sk_buff *entskb = entry->skb;
314 struct net_device *indev;
315 struct net_device *outdev;
316 struct nf_conn *ct = NULL;
317 enum ip_conntrack_info uninitialized_var(ctinfo);
318 bool csum_verify;
319
320 size = nlmsg_total_size(sizeof(struct nfgenmsg))
321 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
322 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
323 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
324 #ifdef CONFIG_BRIDGE_NETFILTER
325 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
326 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
327 #endif
328 + nla_total_size(sizeof(u_int32_t)) /* mark */
329 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
330 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
331 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
332
333 if (entskb->tstamp.tv64)
334 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
335
336 if (entry->hook <= NF_INET_FORWARD ||
337 (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
338 csum_verify = !skb_csum_unnecessary(entskb);
339 else
340 csum_verify = false;
341
342 outdev = entry->outdev;
343
344 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
345 case NFQNL_COPY_META:
346 case NFQNL_COPY_NONE:
347 break;
348
349 case NFQNL_COPY_PACKET:
350 if (!(queue->flags & NFQA_CFG_F_GSO) &&
351 entskb->ip_summed == CHECKSUM_PARTIAL &&
352 skb_checksum_help(entskb))
353 return NULL;
354
355 data_len = ACCESS_ONCE(queue->copy_range);
356 if (data_len > entskb->len)
357 data_len = entskb->len;
358
359 if (!entskb->head_frag ||
360 skb_headlen(entskb) < L1_CACHE_BYTES ||
361 skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS)
362 hlen = skb_headlen(entskb);
363
364 if (skb_has_frag_list(entskb))
365 hlen = entskb->len;
366 hlen = min_t(int, data_len, hlen);
367 size += sizeof(struct nlattr) + hlen;
368 cap_len = entskb->len;
369 break;
370 }
371
372 if (queue->flags & NFQA_CFG_F_CONNTRACK)
373 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
374
375 skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid,
376 GFP_ATOMIC);
377 if (!skb)
378 return NULL;
379
380 nlh = nlmsg_put(skb, 0, 0,
381 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
382 sizeof(struct nfgenmsg), 0);
383 if (!nlh) {
384 kfree_skb(skb);
385 return NULL;
386 }
387 nfmsg = nlmsg_data(nlh);
388 nfmsg->nfgen_family = entry->pf;
389 nfmsg->version = NFNETLINK_V0;
390 nfmsg->res_id = htons(queue->queue_num);
391
392 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
393 pmsg = nla_data(nla);
394 pmsg->hw_protocol = entskb->protocol;
395 pmsg->hook = entry->hook;
396 *packet_id_ptr = &pmsg->packet_id;
397
398 indev = entry->indev;
399 if (indev) {
400 #ifndef CONFIG_BRIDGE_NETFILTER
401 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
402 goto nla_put_failure;
403 #else
404 if (entry->pf == PF_BRIDGE) {
405 /* Case 1: indev is physical input device, we need to
406 * look for bridge group (when called from
407 * netfilter_bridge) */
408 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
409 htonl(indev->ifindex)) ||
410 /* this is the bridge group "brX" */
411 /* rcu_read_lock()ed by __nf_queue */
412 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
413 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
414 goto nla_put_failure;
415 } else {
416 /* Case 2: indev is bridge group, we need to look for
417 * physical device (when called from ipv4) */
418 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
419 htonl(indev->ifindex)))
420 goto nla_put_failure;
421 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
422 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
423 htonl(entskb->nf_bridge->physindev->ifindex)))
424 goto nla_put_failure;
425 }
426 #endif
427 }
428
429 if (outdev) {
430 #ifndef CONFIG_BRIDGE_NETFILTER
431 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
432 goto nla_put_failure;
433 #else
434 if (entry->pf == PF_BRIDGE) {
435 /* Case 1: outdev is physical output device, we need to
436 * look for bridge group (when called from
437 * netfilter_bridge) */
438 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
439 htonl(outdev->ifindex)) ||
440 /* this is the bridge group "brX" */
441 /* rcu_read_lock()ed by __nf_queue */
442 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
443 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
444 goto nla_put_failure;
445 } else {
446 /* Case 2: outdev is bridge group, we need to look for
447 * physical output device (when called from ipv4) */
448 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
449 htonl(outdev->ifindex)))
450 goto nla_put_failure;
451 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
452 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
453 htonl(entskb->nf_bridge->physoutdev->ifindex)))
454 goto nla_put_failure;
455 }
456 #endif
457 }
458
459 if (entskb->mark &&
460 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
461 goto nla_put_failure;
462
463 if (indev && entskb->dev &&
464 entskb->mac_header != entskb->network_header) {
465 struct nfqnl_msg_packet_hw phw;
466 int len = dev_parse_header(entskb, phw.hw_addr);
467 if (len) {
468 phw.hw_addrlen = htons(len);
469 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
470 goto nla_put_failure;
471 }
472 }
473
474 if (entskb->tstamp.tv64) {
475 struct nfqnl_msg_packet_timestamp ts;
476 struct timeval tv = ktime_to_timeval(entskb->tstamp);
477 ts.sec = cpu_to_be64(tv.tv_sec);
478 ts.usec = cpu_to_be64(tv.tv_usec);
479
480 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
481 goto nla_put_failure;
482 }
483
484 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
485 goto nla_put_failure;
486
487 if (cap_len > data_len &&
488 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
489 goto nla_put_failure;
490
491 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
492 goto nla_put_failure;
493
494 if (data_len) {
495 struct nlattr *nla;
496
497 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
498 goto nla_put_failure;
499
500 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
501 nla->nla_type = NFQA_PAYLOAD;
502 nla->nla_len = nla_attr_size(data_len);
503
504 nfqnl_zcopy(skb, entskb, data_len, hlen);
505 }
506
507 nlh->nlmsg_len = skb->len;
508 return skb;
509
510 nla_put_failure:
511 kfree_skb(skb);
512 net_err_ratelimited("nf_queue: error creating packet message\n");
513 return NULL;
514 }
515
516 static int
517 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
518 struct nf_queue_entry *entry)
519 {
520 struct sk_buff *nskb;
521 int err = -ENOBUFS;
522 __be32 *packet_id_ptr;
523 int failopen = 0;
524
525 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
526 if (nskb == NULL) {
527 err = -ENOMEM;
528 goto err_out;
529 }
530 spin_lock_bh(&queue->lock);
531
532 if (queue->queue_total >= queue->queue_maxlen) {
533 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
534 failopen = 1;
535 err = 0;
536 } else {
537 queue->queue_dropped++;
538 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
539 queue->queue_total);
540 }
541 goto err_out_free_nskb;
542 }
543 entry->id = ++queue->id_sequence;
544 *packet_id_ptr = htonl(entry->id);
545
546 /* nfnetlink_unicast will either free the nskb or add it to a socket */
547 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
548 if (err < 0) {
549 queue->queue_user_dropped++;
550 goto err_out_unlock;
551 }
552
553 __enqueue_entry(queue, entry);
554
555 spin_unlock_bh(&queue->lock);
556 return 0;
557
558 err_out_free_nskb:
559 kfree_skb(nskb);
560 err_out_unlock:
561 spin_unlock_bh(&queue->lock);
562 if (failopen)
563 nf_reinject(entry, NF_ACCEPT);
564 err_out:
565 return err;
566 }
567
568 static struct nf_queue_entry *
569 nf_queue_entry_dup(struct nf_queue_entry *e)
570 {
571 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
572 if (entry) {
573 if (nf_queue_entry_get_refs(entry))
574 return entry;
575 kfree(entry);
576 }
577 return NULL;
578 }
579
580 #ifdef CONFIG_BRIDGE_NETFILTER
581 /* When called from bridge netfilter, skb->data must point to MAC header
582 * before calling skb_gso_segment(). Else, original MAC header is lost
583 * and segmented skbs will be sent to wrong destination.
584 */
585 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
586 {
587 if (skb->nf_bridge)
588 __skb_push(skb, skb->network_header - skb->mac_header);
589 }
590
591 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
592 {
593 if (skb->nf_bridge)
594 __skb_pull(skb, skb->network_header - skb->mac_header);
595 }
596 #else
597 #define nf_bridge_adjust_skb_data(s) do {} while (0)
598 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
599 #endif
600
601 static void free_entry(struct nf_queue_entry *entry)
602 {
603 nf_queue_entry_release_refs(entry);
604 kfree(entry);
605 }
606
607 static int
608 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
609 struct sk_buff *skb, struct nf_queue_entry *entry)
610 {
611 int ret = -ENOMEM;
612 struct nf_queue_entry *entry_seg;
613
614 nf_bridge_adjust_segmented_data(skb);
615
616 if (skb->next == NULL) { /* last packet, no need to copy entry */
617 struct sk_buff *gso_skb = entry->skb;
618 entry->skb = skb;
619 ret = __nfqnl_enqueue_packet(net, queue, entry);
620 if (ret)
621 entry->skb = gso_skb;
622 return ret;
623 }
624
625 skb->next = NULL;
626
627 entry_seg = nf_queue_entry_dup(entry);
628 if (entry_seg) {
629 entry_seg->skb = skb;
630 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
631 if (ret)
632 free_entry(entry_seg);
633 }
634 return ret;
635 }
636
637 static int
638 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
639 {
640 unsigned int queued;
641 struct nfqnl_instance *queue;
642 struct sk_buff *skb, *segs;
643 int err = -ENOBUFS;
644 struct net *net = dev_net(entry->indev ?
645 entry->indev : entry->outdev);
646 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
647
648 /* rcu_read_lock()ed by nf_hook_slow() */
649 queue = instance_lookup(q, queuenum);
650 if (!queue)
651 return -ESRCH;
652
653 if (queue->copy_mode == NFQNL_COPY_NONE)
654 return -EINVAL;
655
656 skb = entry->skb;
657
658 switch (entry->pf) {
659 case NFPROTO_IPV4:
660 skb->protocol = htons(ETH_P_IP);
661 break;
662 case NFPROTO_IPV6:
663 skb->protocol = htons(ETH_P_IPV6);
664 break;
665 }
666
667 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
668 return __nfqnl_enqueue_packet(net, queue, entry);
669
670 nf_bridge_adjust_skb_data(skb);
671 segs = skb_gso_segment(skb, 0);
672 /* Does not use PTR_ERR to limit the number of error codes that can be
673 * returned by nf_queue. For instance, callers rely on -ECANCELED to
674 * mean 'ignore this hook'.
675 */
676 if (IS_ERR(segs))
677 goto out_err;
678 queued = 0;
679 err = 0;
680 do {
681 struct sk_buff *nskb = segs->next;
682 if (err == 0)
683 err = __nfqnl_enqueue_packet_gso(net, queue,
684 segs, entry);
685 if (err == 0)
686 queued++;
687 else
688 kfree_skb(segs);
689 segs = nskb;
690 } while (segs);
691
692 if (queued) {
693 if (err) /* some segments are already queued */
694 free_entry(entry);
695 kfree_skb(skb);
696 return 0;
697 }
698 out_err:
699 nf_bridge_adjust_segmented_data(skb);
700 return err;
701 }
702
703 static int
704 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
705 {
706 struct sk_buff *nskb;
707
708 if (diff < 0) {
709 if (pskb_trim(e->skb, data_len))
710 return -ENOMEM;
711 } else if (diff > 0) {
712 if (data_len > 0xFFFF)
713 return -EINVAL;
714 if (diff > skb_tailroom(e->skb)) {
715 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
716 diff, GFP_ATOMIC);
717 if (!nskb) {
718 printk(KERN_WARNING "nf_queue: OOM "
719 "in mangle, dropping packet\n");
720 return -ENOMEM;
721 }
722 kfree_skb(e->skb);
723 e->skb = nskb;
724 }
725 skb_put(e->skb, diff);
726 }
727 if (!skb_make_writable(e->skb, data_len))
728 return -ENOMEM;
729 skb_copy_to_linear_data(e->skb, data, data_len);
730 e->skb->ip_summed = CHECKSUM_NONE;
731 return 0;
732 }
733
734 static int
735 nfqnl_set_mode(struct nfqnl_instance *queue,
736 unsigned char mode, unsigned int range)
737 {
738 int status = 0;
739
740 spin_lock_bh(&queue->lock);
741 switch (mode) {
742 case NFQNL_COPY_NONE:
743 case NFQNL_COPY_META:
744 queue->copy_mode = mode;
745 queue->copy_range = 0;
746 break;
747
748 case NFQNL_COPY_PACKET:
749 queue->copy_mode = mode;
750 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
751 queue->copy_range = NFQNL_MAX_COPY_RANGE;
752 else
753 queue->copy_range = range;
754 break;
755
756 default:
757 status = -EINVAL;
758
759 }
760 spin_unlock_bh(&queue->lock);
761
762 return status;
763 }
764
765 static int
766 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
767 {
768 if (entry->indev)
769 if (entry->indev->ifindex == ifindex)
770 return 1;
771 if (entry->outdev)
772 if (entry->outdev->ifindex == ifindex)
773 return 1;
774 #ifdef CONFIG_BRIDGE_NETFILTER
775 if (entry->skb->nf_bridge) {
776 if (entry->skb->nf_bridge->physindev &&
777 entry->skb->nf_bridge->physindev->ifindex == ifindex)
778 return 1;
779 if (entry->skb->nf_bridge->physoutdev &&
780 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
781 return 1;
782 }
783 #endif
784 return 0;
785 }
786
787 /* drop all packets with either indev or outdev == ifindex from all queue
788 * instances */
789 static void
790 nfqnl_dev_drop(struct net *net, int ifindex)
791 {
792 int i;
793 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
794
795 rcu_read_lock();
796
797 for (i = 0; i < INSTANCE_BUCKETS; i++) {
798 struct nfqnl_instance *inst;
799 struct hlist_head *head = &q->instance_table[i];
800
801 hlist_for_each_entry_rcu(inst, head, hlist)
802 nfqnl_flush(inst, dev_cmp, ifindex);
803 }
804
805 rcu_read_unlock();
806 }
807
808 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
809
810 static int
811 nfqnl_rcv_dev_event(struct notifier_block *this,
812 unsigned long event, void *ptr)
813 {
814 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
815
816 /* Drop any packets associated with the downed device */
817 if (event == NETDEV_DOWN)
818 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
819 return NOTIFY_DONE;
820 }
821
822 static struct notifier_block nfqnl_dev_notifier = {
823 .notifier_call = nfqnl_rcv_dev_event,
824 };
825
826 static int
827 nfqnl_rcv_nl_event(struct notifier_block *this,
828 unsigned long event, void *ptr)
829 {
830 struct netlink_notify *n = ptr;
831 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
832
833 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
834 int i;
835
836 /* destroy all instances for this portid */
837 spin_lock(&q->instances_lock);
838 for (i = 0; i < INSTANCE_BUCKETS; i++) {
839 struct hlist_node *t2;
840 struct nfqnl_instance *inst;
841 struct hlist_head *head = &q->instance_table[i];
842
843 hlist_for_each_entry_safe(inst, t2, head, hlist) {
844 if (n->portid == inst->peer_portid)
845 __instance_destroy(inst);
846 }
847 }
848 spin_unlock(&q->instances_lock);
849 }
850 return NOTIFY_DONE;
851 }
852
853 static struct notifier_block nfqnl_rtnl_notifier = {
854 .notifier_call = nfqnl_rcv_nl_event,
855 };
856
857 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
858 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
859 [NFQA_MARK] = { .type = NLA_U32 },
860 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
861 [NFQA_CT] = { .type = NLA_UNSPEC },
862 };
863
864 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
865 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
866 [NFQA_MARK] = { .type = NLA_U32 },
867 };
868
869 static struct nfqnl_instance *
870 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
871 {
872 struct nfqnl_instance *queue;
873
874 queue = instance_lookup(q, queue_num);
875 if (!queue)
876 return ERR_PTR(-ENODEV);
877
878 if (queue->peer_portid != nlportid)
879 return ERR_PTR(-EPERM);
880
881 return queue;
882 }
883
884 static struct nfqnl_msg_verdict_hdr*
885 verdicthdr_get(const struct nlattr * const nfqa[])
886 {
887 struct nfqnl_msg_verdict_hdr *vhdr;
888 unsigned int verdict;
889
890 if (!nfqa[NFQA_VERDICT_HDR])
891 return NULL;
892
893 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
894 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
895 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
896 return NULL;
897 return vhdr;
898 }
899
900 static int nfq_id_after(unsigned int id, unsigned int max)
901 {
902 return (int)(id - max) > 0;
903 }
904
905 static int
906 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
907 const struct nlmsghdr *nlh,
908 const struct nlattr * const nfqa[])
909 {
910 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
911 struct nf_queue_entry *entry, *tmp;
912 unsigned int verdict, maxid;
913 struct nfqnl_msg_verdict_hdr *vhdr;
914 struct nfqnl_instance *queue;
915 LIST_HEAD(batch_list);
916 u16 queue_num = ntohs(nfmsg->res_id);
917
918 struct net *net = sock_net(ctnl);
919 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
920
921 queue = verdict_instance_lookup(q, queue_num,
922 NETLINK_CB(skb).portid);
923 if (IS_ERR(queue))
924 return PTR_ERR(queue);
925
926 vhdr = verdicthdr_get(nfqa);
927 if (!vhdr)
928 return -EINVAL;
929
930 verdict = ntohl(vhdr->verdict);
931 maxid = ntohl(vhdr->id);
932
933 spin_lock_bh(&queue->lock);
934
935 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
936 if (nfq_id_after(entry->id, maxid))
937 break;
938 __dequeue_entry(queue, entry);
939 list_add_tail(&entry->list, &batch_list);
940 }
941
942 spin_unlock_bh(&queue->lock);
943
944 if (list_empty(&batch_list))
945 return -ENOENT;
946
947 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
948 if (nfqa[NFQA_MARK])
949 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
950 nf_reinject(entry, verdict);
951 }
952 return 0;
953 }
954
955 static int
956 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
957 const struct nlmsghdr *nlh,
958 const struct nlattr * const nfqa[])
959 {
960 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
961 u_int16_t queue_num = ntohs(nfmsg->res_id);
962
963 struct nfqnl_msg_verdict_hdr *vhdr;
964 struct nfqnl_instance *queue;
965 unsigned int verdict;
966 struct nf_queue_entry *entry;
967 enum ip_conntrack_info uninitialized_var(ctinfo);
968 struct nf_conn *ct = NULL;
969
970 struct net *net = sock_net(ctnl);
971 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
972
973 queue = instance_lookup(q, queue_num);
974 if (!queue)
975 queue = verdict_instance_lookup(q, queue_num,
976 NETLINK_CB(skb).portid);
977 if (IS_ERR(queue))
978 return PTR_ERR(queue);
979
980 vhdr = verdicthdr_get(nfqa);
981 if (!vhdr)
982 return -EINVAL;
983
984 verdict = ntohl(vhdr->verdict);
985
986 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
987 if (entry == NULL)
988 return -ENOENT;
989
990 rcu_read_lock();
991 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
992 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
993
994 if (nfqa[NFQA_PAYLOAD]) {
995 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
996 int diff = payload_len - entry->skb->len;
997
998 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
999 payload_len, entry, diff) < 0)
1000 verdict = NF_DROP;
1001
1002 if (ct)
1003 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
1004 }
1005 rcu_read_unlock();
1006
1007 if (nfqa[NFQA_MARK])
1008 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1009
1010 nf_reinject(entry, verdict);
1011 return 0;
1012 }
1013
1014 static int
1015 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1016 const struct nlmsghdr *nlh,
1017 const struct nlattr * const nfqa[])
1018 {
1019 return -ENOTSUPP;
1020 }
1021
1022 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1023 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1024 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1025 };
1026
1027 static const struct nf_queue_handler nfqh = {
1028 .outfn = &nfqnl_enqueue_packet,
1029 };
1030
1031 static int
1032 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1033 const struct nlmsghdr *nlh,
1034 const struct nlattr * const nfqa[])
1035 {
1036 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1037 u_int16_t queue_num = ntohs(nfmsg->res_id);
1038 struct nfqnl_instance *queue;
1039 struct nfqnl_msg_config_cmd *cmd = NULL;
1040 struct net *net = sock_net(ctnl);
1041 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1042 int ret = 0;
1043
1044 if (nfqa[NFQA_CFG_CMD]) {
1045 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1046
1047 /* Obsolete commands without queue context */
1048 switch (cmd->command) {
1049 case NFQNL_CFG_CMD_PF_BIND: return 0;
1050 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1051 }
1052 }
1053
1054 rcu_read_lock();
1055 queue = instance_lookup(q, queue_num);
1056 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1057 ret = -EPERM;
1058 goto err_out_unlock;
1059 }
1060
1061 if (cmd != NULL) {
1062 switch (cmd->command) {
1063 case NFQNL_CFG_CMD_BIND:
1064 if (queue) {
1065 ret = -EBUSY;
1066 goto err_out_unlock;
1067 }
1068 queue = instance_create(q, queue_num,
1069 NETLINK_CB(skb).portid);
1070 if (IS_ERR(queue)) {
1071 ret = PTR_ERR(queue);
1072 goto err_out_unlock;
1073 }
1074 break;
1075 case NFQNL_CFG_CMD_UNBIND:
1076 if (!queue) {
1077 ret = -ENODEV;
1078 goto err_out_unlock;
1079 }
1080 instance_destroy(q, queue);
1081 break;
1082 case NFQNL_CFG_CMD_PF_BIND:
1083 case NFQNL_CFG_CMD_PF_UNBIND:
1084 break;
1085 default:
1086 ret = -ENOTSUPP;
1087 break;
1088 }
1089 }
1090
1091 if (nfqa[NFQA_CFG_PARAMS]) {
1092 struct nfqnl_msg_config_params *params;
1093
1094 if (!queue) {
1095 ret = -ENODEV;
1096 goto err_out_unlock;
1097 }
1098 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1099 nfqnl_set_mode(queue, params->copy_mode,
1100 ntohl(params->copy_range));
1101 }
1102
1103 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1104 __be32 *queue_maxlen;
1105
1106 if (!queue) {
1107 ret = -ENODEV;
1108 goto err_out_unlock;
1109 }
1110 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1111 spin_lock_bh(&queue->lock);
1112 queue->queue_maxlen = ntohl(*queue_maxlen);
1113 spin_unlock_bh(&queue->lock);
1114 }
1115
1116 if (nfqa[NFQA_CFG_FLAGS]) {
1117 __u32 flags, mask;
1118
1119 if (!queue) {
1120 ret = -ENODEV;
1121 goto err_out_unlock;
1122 }
1123
1124 if (!nfqa[NFQA_CFG_MASK]) {
1125 /* A mask is needed to specify which flags are being
1126 * changed.
1127 */
1128 ret = -EINVAL;
1129 goto err_out_unlock;
1130 }
1131
1132 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1133 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1134
1135 if (flags >= NFQA_CFG_F_MAX) {
1136 ret = -EOPNOTSUPP;
1137 goto err_out_unlock;
1138 }
1139
1140 spin_lock_bh(&queue->lock);
1141 queue->flags &= ~mask;
1142 queue->flags |= flags & mask;
1143 spin_unlock_bh(&queue->lock);
1144 }
1145
1146 err_out_unlock:
1147 rcu_read_unlock();
1148 return ret;
1149 }
1150
1151 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1152 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1153 .attr_count = NFQA_MAX, },
1154 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1155 .attr_count = NFQA_MAX,
1156 .policy = nfqa_verdict_policy },
1157 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1158 .attr_count = NFQA_CFG_MAX,
1159 .policy = nfqa_cfg_policy },
1160 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1161 .attr_count = NFQA_MAX,
1162 .policy = nfqa_verdict_batch_policy },
1163 };
1164
1165 static const struct nfnetlink_subsystem nfqnl_subsys = {
1166 .name = "nf_queue",
1167 .subsys_id = NFNL_SUBSYS_QUEUE,
1168 .cb_count = NFQNL_MSG_MAX,
1169 .cb = nfqnl_cb,
1170 };
1171
1172 #ifdef CONFIG_PROC_FS
1173 struct iter_state {
1174 struct seq_net_private p;
1175 unsigned int bucket;
1176 };
1177
1178 static struct hlist_node *get_first(struct seq_file *seq)
1179 {
1180 struct iter_state *st = seq->private;
1181 struct net *net;
1182 struct nfnl_queue_net *q;
1183
1184 if (!st)
1185 return NULL;
1186
1187 net = seq_file_net(seq);
1188 q = nfnl_queue_pernet(net);
1189 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1190 if (!hlist_empty(&q->instance_table[st->bucket]))
1191 return q->instance_table[st->bucket].first;
1192 }
1193 return NULL;
1194 }
1195
1196 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1197 {
1198 struct iter_state *st = seq->private;
1199 struct net *net = seq_file_net(seq);
1200
1201 h = h->next;
1202 while (!h) {
1203 struct nfnl_queue_net *q;
1204
1205 if (++st->bucket >= INSTANCE_BUCKETS)
1206 return NULL;
1207
1208 q = nfnl_queue_pernet(net);
1209 h = q->instance_table[st->bucket].first;
1210 }
1211 return h;
1212 }
1213
1214 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1215 {
1216 struct hlist_node *head;
1217 head = get_first(seq);
1218
1219 if (head)
1220 while (pos && (head = get_next(seq, head)))
1221 pos--;
1222 return pos ? NULL : head;
1223 }
1224
1225 static void *seq_start(struct seq_file *s, loff_t *pos)
1226 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1227 {
1228 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1229 return get_idx(s, *pos);
1230 }
1231
1232 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1233 {
1234 (*pos)++;
1235 return get_next(s, v);
1236 }
1237
1238 static void seq_stop(struct seq_file *s, void *v)
1239 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1240 {
1241 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1242 }
1243
1244 static int seq_show(struct seq_file *s, void *v)
1245 {
1246 const struct nfqnl_instance *inst = v;
1247
1248 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1249 inst->queue_num,
1250 inst->peer_portid, inst->queue_total,
1251 inst->copy_mode, inst->copy_range,
1252 inst->queue_dropped, inst->queue_user_dropped,
1253 inst->id_sequence, 1);
1254 }
1255
1256 static const struct seq_operations nfqnl_seq_ops = {
1257 .start = seq_start,
1258 .next = seq_next,
1259 .stop = seq_stop,
1260 .show = seq_show,
1261 };
1262
1263 static int nfqnl_open(struct inode *inode, struct file *file)
1264 {
1265 return seq_open_net(inode, file, &nfqnl_seq_ops,
1266 sizeof(struct iter_state));
1267 }
1268
1269 static const struct file_operations nfqnl_file_ops = {
1270 .owner = THIS_MODULE,
1271 .open = nfqnl_open,
1272 .read = seq_read,
1273 .llseek = seq_lseek,
1274 .release = seq_release_net,
1275 };
1276
1277 #endif /* PROC_FS */
1278
1279 static int __net_init nfnl_queue_net_init(struct net *net)
1280 {
1281 unsigned int i;
1282 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1283
1284 for (i = 0; i < INSTANCE_BUCKETS; i++)
1285 INIT_HLIST_HEAD(&q->instance_table[i]);
1286
1287 spin_lock_init(&q->instances_lock);
1288
1289 #ifdef CONFIG_PROC_FS
1290 if (!proc_create("nfnetlink_queue", 0440,
1291 net->nf.proc_netfilter, &nfqnl_file_ops))
1292 return -ENOMEM;
1293 #endif
1294 return 0;
1295 }
1296
1297 static void __net_exit nfnl_queue_net_exit(struct net *net)
1298 {
1299 #ifdef CONFIG_PROC_FS
1300 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1301 #endif
1302 }
1303
1304 static struct pernet_operations nfnl_queue_net_ops = {
1305 .init = nfnl_queue_net_init,
1306 .exit = nfnl_queue_net_exit,
1307 .id = &nfnl_queue_net_id,
1308 .size = sizeof(struct nfnl_queue_net),
1309 };
1310
1311 static int __init nfnetlink_queue_init(void)
1312 {
1313 int status = -ENOMEM;
1314
1315 netlink_register_notifier(&nfqnl_rtnl_notifier);
1316 status = nfnetlink_subsys_register(&nfqnl_subsys);
1317 if (status < 0) {
1318 pr_err("nf_queue: failed to create netlink socket\n");
1319 goto cleanup_netlink_notifier;
1320 }
1321
1322 status = register_pernet_subsys(&nfnl_queue_net_ops);
1323 if (status < 0) {
1324 pr_err("nf_queue: failed to register pernet ops\n");
1325 goto cleanup_subsys;
1326 }
1327 register_netdevice_notifier(&nfqnl_dev_notifier);
1328 nf_register_queue_handler(&nfqh);
1329 return status;
1330
1331 cleanup_subsys:
1332 nfnetlink_subsys_unregister(&nfqnl_subsys);
1333 cleanup_netlink_notifier:
1334 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1335 return status;
1336 }
1337
1338 static void __exit nfnetlink_queue_fini(void)
1339 {
1340 nf_unregister_queue_handler();
1341 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1342 unregister_pernet_subsys(&nfnl_queue_net_ops);
1343 nfnetlink_subsys_unregister(&nfqnl_subsys);
1344 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1345
1346 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1347 }
1348
1349 MODULE_DESCRIPTION("netfilter packet queue handler");
1350 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1351 MODULE_LICENSE("GPL");
1352 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1353
1354 module_init(nfnetlink_queue_init);
1355 module_exit(nfnetlink_queue_fini);
Linus' kernel tree