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ath10k: remove htt rx amsdu clear retry bit hack
[deliverable/linux.git] / net / netfilter / nfnetlink_queue_core.c
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;
467
468 memset(&phw, 0, sizeof(phw));
469 len = dev_parse_header(entskb, phw.hw_addr);
470 if (len) {
471 phw.hw_addrlen = htons(len);
472 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
473 goto nla_put_failure;
474 }
475 }
476
477 if (entskb->tstamp.tv64) {
478 struct nfqnl_msg_packet_timestamp ts;
479 struct timeval tv = ktime_to_timeval(entskb->tstamp);
480 ts.sec = cpu_to_be64(tv.tv_sec);
481 ts.usec = cpu_to_be64(tv.tv_usec);
482
483 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
484 goto nla_put_failure;
485 }
486
487 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
488 goto nla_put_failure;
489
490 if (cap_len > data_len &&
491 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
492 goto nla_put_failure;
493
494 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
495 goto nla_put_failure;
496
497 if (data_len) {
498 struct nlattr *nla;
499
500 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
501 goto nla_put_failure;
502
503 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
504 nla->nla_type = NFQA_PAYLOAD;
505 nla->nla_len = nla_attr_size(data_len);
506
507 nfqnl_zcopy(skb, entskb, data_len, hlen);
508 }
509
510 nlh->nlmsg_len = skb->len;
511 return skb;
512
513 nla_put_failure:
514 kfree_skb(skb);
515 net_err_ratelimited("nf_queue: error creating packet message\n");
516 return NULL;
517 }
518
519 static int
520 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
521 struct nf_queue_entry *entry)
522 {
523 struct sk_buff *nskb;
524 int err = -ENOBUFS;
525 __be32 *packet_id_ptr;
526 int failopen = 0;
527
528 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
529 if (nskb == NULL) {
530 err = -ENOMEM;
531 goto err_out;
532 }
533 spin_lock_bh(&queue->lock);
534
535 if (queue->queue_total >= queue->queue_maxlen) {
536 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
537 failopen = 1;
538 err = 0;
539 } else {
540 queue->queue_dropped++;
541 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
542 queue->queue_total);
543 }
544 goto err_out_free_nskb;
545 }
546 entry->id = ++queue->id_sequence;
547 *packet_id_ptr = htonl(entry->id);
548
549 /* nfnetlink_unicast will either free the nskb or add it to a socket */
550 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
551 if (err < 0) {
552 queue->queue_user_dropped++;
553 goto err_out_unlock;
554 }
555
556 __enqueue_entry(queue, entry);
557
558 spin_unlock_bh(&queue->lock);
559 return 0;
560
561 err_out_free_nskb:
562 kfree_skb(nskb);
563 err_out_unlock:
564 spin_unlock_bh(&queue->lock);
565 if (failopen)
566 nf_reinject(entry, NF_ACCEPT);
567 err_out:
568 return err;
569 }
570
571 static struct nf_queue_entry *
572 nf_queue_entry_dup(struct nf_queue_entry *e)
573 {
574 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
575 if (entry) {
576 if (nf_queue_entry_get_refs(entry))
577 return entry;
578 kfree(entry);
579 }
580 return NULL;
581 }
582
583 #ifdef CONFIG_BRIDGE_NETFILTER
584 /* When called from bridge netfilter, skb->data must point to MAC header
585 * before calling skb_gso_segment(). Else, original MAC header is lost
586 * and segmented skbs will be sent to wrong destination.
587 */
588 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
589 {
590 if (skb->nf_bridge)
591 __skb_push(skb, skb->network_header - skb->mac_header);
592 }
593
594 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
595 {
596 if (skb->nf_bridge)
597 __skb_pull(skb, skb->network_header - skb->mac_header);
598 }
599 #else
600 #define nf_bridge_adjust_skb_data(s) do {} while (0)
601 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
602 #endif
603
604 static void free_entry(struct nf_queue_entry *entry)
605 {
606 nf_queue_entry_release_refs(entry);
607 kfree(entry);
608 }
609
610 static int
611 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
612 struct sk_buff *skb, struct nf_queue_entry *entry)
613 {
614 int ret = -ENOMEM;
615 struct nf_queue_entry *entry_seg;
616
617 nf_bridge_adjust_segmented_data(skb);
618
619 if (skb->next == NULL) { /* last packet, no need to copy entry */
620 struct sk_buff *gso_skb = entry->skb;
621 entry->skb = skb;
622 ret = __nfqnl_enqueue_packet(net, queue, entry);
623 if (ret)
624 entry->skb = gso_skb;
625 return ret;
626 }
627
628 skb->next = NULL;
629
630 entry_seg = nf_queue_entry_dup(entry);
631 if (entry_seg) {
632 entry_seg->skb = skb;
633 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
634 if (ret)
635 free_entry(entry_seg);
636 }
637 return ret;
638 }
639
640 static int
641 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
642 {
643 unsigned int queued;
644 struct nfqnl_instance *queue;
645 struct sk_buff *skb, *segs;
646 int err = -ENOBUFS;
647 struct net *net = dev_net(entry->indev ?
648 entry->indev : entry->outdev);
649 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
650
651 /* rcu_read_lock()ed by nf_hook_slow() */
652 queue = instance_lookup(q, queuenum);
653 if (!queue)
654 return -ESRCH;
655
656 if (queue->copy_mode == NFQNL_COPY_NONE)
657 return -EINVAL;
658
659 skb = entry->skb;
660
661 switch (entry->pf) {
662 case NFPROTO_IPV4:
663 skb->protocol = htons(ETH_P_IP);
664 break;
665 case NFPROTO_IPV6:
666 skb->protocol = htons(ETH_P_IPV6);
667 break;
668 }
669
670 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
671 return __nfqnl_enqueue_packet(net, queue, entry);
672
673 nf_bridge_adjust_skb_data(skb);
674 segs = skb_gso_segment(skb, 0);
675 /* Does not use PTR_ERR to limit the number of error codes that can be
676 * returned by nf_queue. For instance, callers rely on -ECANCELED to
677 * mean 'ignore this hook'.
678 */
679 if (IS_ERR(segs))
680 goto out_err;
681 queued = 0;
682 err = 0;
683 do {
684 struct sk_buff *nskb = segs->next;
685 if (err == 0)
686 err = __nfqnl_enqueue_packet_gso(net, queue,
687 segs, entry);
688 if (err == 0)
689 queued++;
690 else
691 kfree_skb(segs);
692 segs = nskb;
693 } while (segs);
694
695 if (queued) {
696 if (err) /* some segments are already queued */
697 free_entry(entry);
698 kfree_skb(skb);
699 return 0;
700 }
701 out_err:
702 nf_bridge_adjust_segmented_data(skb);
703 return err;
704 }
705
706 static int
707 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
708 {
709 struct sk_buff *nskb;
710
711 if (diff < 0) {
712 if (pskb_trim(e->skb, data_len))
713 return -ENOMEM;
714 } else if (diff > 0) {
715 if (data_len > 0xFFFF)
716 return -EINVAL;
717 if (diff > skb_tailroom(e->skb)) {
718 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
719 diff, GFP_ATOMIC);
720 if (!nskb) {
721 printk(KERN_WARNING "nf_queue: OOM "
722 "in mangle, dropping packet\n");
723 return -ENOMEM;
724 }
725 kfree_skb(e->skb);
726 e->skb = nskb;
727 }
728 skb_put(e->skb, diff);
729 }
730 if (!skb_make_writable(e->skb, data_len))
731 return -ENOMEM;
732 skb_copy_to_linear_data(e->skb, data, data_len);
733 e->skb->ip_summed = CHECKSUM_NONE;
734 return 0;
735 }
736
737 static int
738 nfqnl_set_mode(struct nfqnl_instance *queue,
739 unsigned char mode, unsigned int range)
740 {
741 int status = 0;
742
743 spin_lock_bh(&queue->lock);
744 switch (mode) {
745 case NFQNL_COPY_NONE:
746 case NFQNL_COPY_META:
747 queue->copy_mode = mode;
748 queue->copy_range = 0;
749 break;
750
751 case NFQNL_COPY_PACKET:
752 queue->copy_mode = mode;
753 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
754 queue->copy_range = NFQNL_MAX_COPY_RANGE;
755 else
756 queue->copy_range = range;
757 break;
758
759 default:
760 status = -EINVAL;
761
762 }
763 spin_unlock_bh(&queue->lock);
764
765 return status;
766 }
767
768 static int
769 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
770 {
771 if (entry->indev)
772 if (entry->indev->ifindex == ifindex)
773 return 1;
774 if (entry->outdev)
775 if (entry->outdev->ifindex == ifindex)
776 return 1;
777 #ifdef CONFIG_BRIDGE_NETFILTER
778 if (entry->skb->nf_bridge) {
779 if (entry->skb->nf_bridge->physindev &&
780 entry->skb->nf_bridge->physindev->ifindex == ifindex)
781 return 1;
782 if (entry->skb->nf_bridge->physoutdev &&
783 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
784 return 1;
785 }
786 #endif
787 return 0;
788 }
789
790 /* drop all packets with either indev or outdev == ifindex from all queue
791 * instances */
792 static void
793 nfqnl_dev_drop(struct net *net, int ifindex)
794 {
795 int i;
796 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
797
798 rcu_read_lock();
799
800 for (i = 0; i < INSTANCE_BUCKETS; i++) {
801 struct nfqnl_instance *inst;
802 struct hlist_head *head = &q->instance_table[i];
803
804 hlist_for_each_entry_rcu(inst, head, hlist)
805 nfqnl_flush(inst, dev_cmp, ifindex);
806 }
807
808 rcu_read_unlock();
809 }
810
811 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
812
813 static int
814 nfqnl_rcv_dev_event(struct notifier_block *this,
815 unsigned long event, void *ptr)
816 {
817 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
818
819 /* Drop any packets associated with the downed device */
820 if (event == NETDEV_DOWN)
821 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
822 return NOTIFY_DONE;
823 }
824
825 static struct notifier_block nfqnl_dev_notifier = {
826 .notifier_call = nfqnl_rcv_dev_event,
827 };
828
829 static int
830 nfqnl_rcv_nl_event(struct notifier_block *this,
831 unsigned long event, void *ptr)
832 {
833 struct netlink_notify *n = ptr;
834 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
835
836 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
837 int i;
838
839 /* destroy all instances for this portid */
840 spin_lock(&q->instances_lock);
841 for (i = 0; i < INSTANCE_BUCKETS; i++) {
842 struct hlist_node *t2;
843 struct nfqnl_instance *inst;
844 struct hlist_head *head = &q->instance_table[i];
845
846 hlist_for_each_entry_safe(inst, t2, head, hlist) {
847 if (n->portid == inst->peer_portid)
848 __instance_destroy(inst);
849 }
850 }
851 spin_unlock(&q->instances_lock);
852 }
853 return NOTIFY_DONE;
854 }
855
856 static struct notifier_block nfqnl_rtnl_notifier = {
857 .notifier_call = nfqnl_rcv_nl_event,
858 };
859
860 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
861 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
862 [NFQA_MARK] = { .type = NLA_U32 },
863 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
864 [NFQA_CT] = { .type = NLA_UNSPEC },
865 [NFQA_EXP] = { .type = NLA_UNSPEC },
866 };
867
868 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
869 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
870 [NFQA_MARK] = { .type = NLA_U32 },
871 };
872
873 static struct nfqnl_instance *
874 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
875 {
876 struct nfqnl_instance *queue;
877
878 queue = instance_lookup(q, queue_num);
879 if (!queue)
880 return ERR_PTR(-ENODEV);
881
882 if (queue->peer_portid != nlportid)
883 return ERR_PTR(-EPERM);
884
885 return queue;
886 }
887
888 static struct nfqnl_msg_verdict_hdr*
889 verdicthdr_get(const struct nlattr * const nfqa[])
890 {
891 struct nfqnl_msg_verdict_hdr *vhdr;
892 unsigned int verdict;
893
894 if (!nfqa[NFQA_VERDICT_HDR])
895 return NULL;
896
897 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
898 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
899 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
900 return NULL;
901 return vhdr;
902 }
903
904 static int nfq_id_after(unsigned int id, unsigned int max)
905 {
906 return (int)(id - max) > 0;
907 }
908
909 static int
910 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
911 const struct nlmsghdr *nlh,
912 const struct nlattr * const nfqa[])
913 {
914 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
915 struct nf_queue_entry *entry, *tmp;
916 unsigned int verdict, maxid;
917 struct nfqnl_msg_verdict_hdr *vhdr;
918 struct nfqnl_instance *queue;
919 LIST_HEAD(batch_list);
920 u16 queue_num = ntohs(nfmsg->res_id);
921
922 struct net *net = sock_net(ctnl);
923 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
924
925 queue = verdict_instance_lookup(q, queue_num,
926 NETLINK_CB(skb).portid);
927 if (IS_ERR(queue))
928 return PTR_ERR(queue);
929
930 vhdr = verdicthdr_get(nfqa);
931 if (!vhdr)
932 return -EINVAL;
933
934 verdict = ntohl(vhdr->verdict);
935 maxid = ntohl(vhdr->id);
936
937 spin_lock_bh(&queue->lock);
938
939 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
940 if (nfq_id_after(entry->id, maxid))
941 break;
942 __dequeue_entry(queue, entry);
943 list_add_tail(&entry->list, &batch_list);
944 }
945
946 spin_unlock_bh(&queue->lock);
947
948 if (list_empty(&batch_list))
949 return -ENOENT;
950
951 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
952 if (nfqa[NFQA_MARK])
953 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
954 nf_reinject(entry, verdict);
955 }
956 return 0;
957 }
958
959 static int
960 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
961 const struct nlmsghdr *nlh,
962 const struct nlattr * const nfqa[])
963 {
964 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
965 u_int16_t queue_num = ntohs(nfmsg->res_id);
966
967 struct nfqnl_msg_verdict_hdr *vhdr;
968 struct nfqnl_instance *queue;
969 unsigned int verdict;
970 struct nf_queue_entry *entry;
971 enum ip_conntrack_info uninitialized_var(ctinfo);
972 struct nf_conn *ct = NULL;
973
974 struct net *net = sock_net(ctnl);
975 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
976
977 queue = instance_lookup(q, queue_num);
978 if (!queue)
979 queue = verdict_instance_lookup(q, queue_num,
980 NETLINK_CB(skb).portid);
981 if (IS_ERR(queue))
982 return PTR_ERR(queue);
983
984 vhdr = verdicthdr_get(nfqa);
985 if (!vhdr)
986 return -EINVAL;
987
988 verdict = ntohl(vhdr->verdict);
989
990 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
991 if (entry == NULL)
992 return -ENOENT;
993
994 if (nfqa[NFQA_CT]) {
995 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
996 if (ct && nfqa[NFQA_EXP]) {
997 nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
998 NETLINK_CB(skb).portid,
999 nlmsg_report(nlh));
1000 }
1001 }
1002
1003 if (nfqa[NFQA_PAYLOAD]) {
1004 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1005 int diff = payload_len - entry->skb->len;
1006
1007 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1008 payload_len, entry, diff) < 0)
1009 verdict = NF_DROP;
1010
1011 if (ct)
1012 nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
1013 }
1014
1015 if (nfqa[NFQA_MARK])
1016 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1017
1018 nf_reinject(entry, verdict);
1019 return 0;
1020 }
1021
1022 static int
1023 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1024 const struct nlmsghdr *nlh,
1025 const struct nlattr * const nfqa[])
1026 {
1027 return -ENOTSUPP;
1028 }
1029
1030 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1031 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1032 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1033 };
1034
1035 static const struct nf_queue_handler nfqh = {
1036 .outfn = &nfqnl_enqueue_packet,
1037 };
1038
1039 static int
1040 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1041 const struct nlmsghdr *nlh,
1042 const struct nlattr * const nfqa[])
1043 {
1044 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1045 u_int16_t queue_num = ntohs(nfmsg->res_id);
1046 struct nfqnl_instance *queue;
1047 struct nfqnl_msg_config_cmd *cmd = NULL;
1048 struct net *net = sock_net(ctnl);
1049 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1050 int ret = 0;
1051
1052 if (nfqa[NFQA_CFG_CMD]) {
1053 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1054
1055 /* Obsolete commands without queue context */
1056 switch (cmd->command) {
1057 case NFQNL_CFG_CMD_PF_BIND: return 0;
1058 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1059 }
1060 }
1061
1062 rcu_read_lock();
1063 queue = instance_lookup(q, queue_num);
1064 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1065 ret = -EPERM;
1066 goto err_out_unlock;
1067 }
1068
1069 if (cmd != NULL) {
1070 switch (cmd->command) {
1071 case NFQNL_CFG_CMD_BIND:
1072 if (queue) {
1073 ret = -EBUSY;
1074 goto err_out_unlock;
1075 }
1076 queue = instance_create(q, queue_num,
1077 NETLINK_CB(skb).portid);
1078 if (IS_ERR(queue)) {
1079 ret = PTR_ERR(queue);
1080 goto err_out_unlock;
1081 }
1082 break;
1083 case NFQNL_CFG_CMD_UNBIND:
1084 if (!queue) {
1085 ret = -ENODEV;
1086 goto err_out_unlock;
1087 }
1088 instance_destroy(q, queue);
1089 break;
1090 case NFQNL_CFG_CMD_PF_BIND:
1091 case NFQNL_CFG_CMD_PF_UNBIND:
1092 break;
1093 default:
1094 ret = -ENOTSUPP;
1095 break;
1096 }
1097 }
1098
1099 if (nfqa[NFQA_CFG_PARAMS]) {
1100 struct nfqnl_msg_config_params *params;
1101
1102 if (!queue) {
1103 ret = -ENODEV;
1104 goto err_out_unlock;
1105 }
1106 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1107 nfqnl_set_mode(queue, params->copy_mode,
1108 ntohl(params->copy_range));
1109 }
1110
1111 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1112 __be32 *queue_maxlen;
1113
1114 if (!queue) {
1115 ret = -ENODEV;
1116 goto err_out_unlock;
1117 }
1118 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1119 spin_lock_bh(&queue->lock);
1120 queue->queue_maxlen = ntohl(*queue_maxlen);
1121 spin_unlock_bh(&queue->lock);
1122 }
1123
1124 if (nfqa[NFQA_CFG_FLAGS]) {
1125 __u32 flags, mask;
1126
1127 if (!queue) {
1128 ret = -ENODEV;
1129 goto err_out_unlock;
1130 }
1131
1132 if (!nfqa[NFQA_CFG_MASK]) {
1133 /* A mask is needed to specify which flags are being
1134 * changed.
1135 */
1136 ret = -EINVAL;
1137 goto err_out_unlock;
1138 }
1139
1140 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1141 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1142
1143 if (flags >= NFQA_CFG_F_MAX) {
1144 ret = -EOPNOTSUPP;
1145 goto err_out_unlock;
1146 }
1147
1148 spin_lock_bh(&queue->lock);
1149 queue->flags &= ~mask;
1150 queue->flags |= flags & mask;
1151 spin_unlock_bh(&queue->lock);
1152 }
1153
1154 err_out_unlock:
1155 rcu_read_unlock();
1156 return ret;
1157 }
1158
1159 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1160 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1161 .attr_count = NFQA_MAX, },
1162 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1163 .attr_count = NFQA_MAX,
1164 .policy = nfqa_verdict_policy },
1165 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1166 .attr_count = NFQA_CFG_MAX,
1167 .policy = nfqa_cfg_policy },
1168 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1169 .attr_count = NFQA_MAX,
1170 .policy = nfqa_verdict_batch_policy },
1171 };
1172
1173 static const struct nfnetlink_subsystem nfqnl_subsys = {
1174 .name = "nf_queue",
1175 .subsys_id = NFNL_SUBSYS_QUEUE,
1176 .cb_count = NFQNL_MSG_MAX,
1177 .cb = nfqnl_cb,
1178 };
1179
1180 #ifdef CONFIG_PROC_FS
1181 struct iter_state {
1182 struct seq_net_private p;
1183 unsigned int bucket;
1184 };
1185
1186 static struct hlist_node *get_first(struct seq_file *seq)
1187 {
1188 struct iter_state *st = seq->private;
1189 struct net *net;
1190 struct nfnl_queue_net *q;
1191
1192 if (!st)
1193 return NULL;
1194
1195 net = seq_file_net(seq);
1196 q = nfnl_queue_pernet(net);
1197 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1198 if (!hlist_empty(&q->instance_table[st->bucket]))
1199 return q->instance_table[st->bucket].first;
1200 }
1201 return NULL;
1202 }
1203
1204 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1205 {
1206 struct iter_state *st = seq->private;
1207 struct net *net = seq_file_net(seq);
1208
1209 h = h->next;
1210 while (!h) {
1211 struct nfnl_queue_net *q;
1212
1213 if (++st->bucket >= INSTANCE_BUCKETS)
1214 return NULL;
1215
1216 q = nfnl_queue_pernet(net);
1217 h = q->instance_table[st->bucket].first;
1218 }
1219 return h;
1220 }
1221
1222 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1223 {
1224 struct hlist_node *head;
1225 head = get_first(seq);
1226
1227 if (head)
1228 while (pos && (head = get_next(seq, head)))
1229 pos--;
1230 return pos ? NULL : head;
1231 }
1232
1233 static void *seq_start(struct seq_file *s, loff_t *pos)
1234 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1235 {
1236 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1237 return get_idx(s, *pos);
1238 }
1239
1240 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1241 {
1242 (*pos)++;
1243 return get_next(s, v);
1244 }
1245
1246 static void seq_stop(struct seq_file *s, void *v)
1247 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1248 {
1249 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1250 }
1251
1252 static int seq_show(struct seq_file *s, void *v)
1253 {
1254 const struct nfqnl_instance *inst = v;
1255
1256 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1257 inst->queue_num,
1258 inst->peer_portid, inst->queue_total,
1259 inst->copy_mode, inst->copy_range,
1260 inst->queue_dropped, inst->queue_user_dropped,
1261 inst->id_sequence, 1);
1262 }
1263
1264 static const struct seq_operations nfqnl_seq_ops = {
1265 .start = seq_start,
1266 .next = seq_next,
1267 .stop = seq_stop,
1268 .show = seq_show,
1269 };
1270
1271 static int nfqnl_open(struct inode *inode, struct file *file)
1272 {
1273 return seq_open_net(inode, file, &nfqnl_seq_ops,
1274 sizeof(struct iter_state));
1275 }
1276
1277 static const struct file_operations nfqnl_file_ops = {
1278 .owner = THIS_MODULE,
1279 .open = nfqnl_open,
1280 .read = seq_read,
1281 .llseek = seq_lseek,
1282 .release = seq_release_net,
1283 };
1284
1285 #endif /* PROC_FS */
1286
1287 static int __net_init nfnl_queue_net_init(struct net *net)
1288 {
1289 unsigned int i;
1290 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1291
1292 for (i = 0; i < INSTANCE_BUCKETS; i++)
1293 INIT_HLIST_HEAD(&q->instance_table[i]);
1294
1295 spin_lock_init(&q->instances_lock);
1296
1297 #ifdef CONFIG_PROC_FS
1298 if (!proc_create("nfnetlink_queue", 0440,
1299 net->nf.proc_netfilter, &nfqnl_file_ops))
1300 return -ENOMEM;
1301 #endif
1302 return 0;
1303 }
1304
1305 static void __net_exit nfnl_queue_net_exit(struct net *net)
1306 {
1307 #ifdef CONFIG_PROC_FS
1308 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1309 #endif
1310 }
1311
1312 static struct pernet_operations nfnl_queue_net_ops = {
1313 .init = nfnl_queue_net_init,
1314 .exit = nfnl_queue_net_exit,
1315 .id = &nfnl_queue_net_id,
1316 .size = sizeof(struct nfnl_queue_net),
1317 };
1318
1319 static int __init nfnetlink_queue_init(void)
1320 {
1321 int status = -ENOMEM;
1322
1323 netlink_register_notifier(&nfqnl_rtnl_notifier);
1324 status = nfnetlink_subsys_register(&nfqnl_subsys);
1325 if (status < 0) {
1326 pr_err("nf_queue: failed to create netlink socket\n");
1327 goto cleanup_netlink_notifier;
1328 }
1329
1330 status = register_pernet_subsys(&nfnl_queue_net_ops);
1331 if (status < 0) {
1332 pr_err("nf_queue: failed to register pernet ops\n");
1333 goto cleanup_subsys;
1334 }
1335 register_netdevice_notifier(&nfqnl_dev_notifier);
1336 nf_register_queue_handler(&nfqh);
1337 return status;
1338
1339 cleanup_subsys:
1340 nfnetlink_subsys_unregister(&nfqnl_subsys);
1341 cleanup_netlink_notifier:
1342 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1343 return status;
1344 }
1345
1346 static void __exit nfnetlink_queue_fini(void)
1347 {
1348 nf_unregister_queue_handler();
1349 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1350 unregister_pernet_subsys(&nfnl_queue_net_ops);
1351 nfnetlink_subsys_unregister(&nfqnl_subsys);
1352 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1353
1354 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1355 }
1356
1357 MODULE_DESCRIPTION("netfilter packet queue handler");
1358 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1359 MODULE_LICENSE("GPL");
1360 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1361
1362 module_init(nfnetlink_queue_init);
1363 module_exit(nfnetlink_queue_fini);
Linux kernel - Deliverables
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