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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / netfilter / nfnetlink_queue.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_bridge.h>
29 #include <linux/netfilter/nfnetlink.h>
30 #include <linux/netfilter/nfnetlink_queue.h>
31 #include <linux/netfilter/nf_conntrack_common.h>
32 #include <linux/list.h>
33 #include <net/sock.h>
34 #include <net/tcp_states.h>
35 #include <net/netfilter/nf_queue.h>
36 #include <net/netns/generic.h>
37
38 #include <linux/atomic.h>
39
40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41 #include "../bridge/br_private.h"
42 #endif
43
44 #define NFQNL_QMAX_DEFAULT 1024
45
46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
47 * includes the header length. Thus, the maximum packet length that we
48 * support is 65531 bytes. We send truncated packets if the specified length
49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
50 * attribute to detect truncation.
51 */
52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
53
54 struct nfqnl_instance {
55 struct hlist_node hlist; /* global list of queues */
56 struct rcu_head rcu;
57
58 u32 peer_portid;
59 unsigned int queue_maxlen;
60 unsigned int copy_range;
61 unsigned int queue_dropped;
62 unsigned int queue_user_dropped;
63
64
65 u_int16_t queue_num; /* number of this queue */
66 u_int8_t copy_mode;
67 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
68 /*
69 * Following fields are dirtied for each queued packet,
70 * keep them in same cache line if possible.
71 */
72 spinlock_t lock;
73 unsigned int queue_total;
74 unsigned int id_sequence; /* 'sequence' of pkt ids */
75 struct list_head queue_list; /* packets in queue */
76 };
77
78 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
79
80 static int nfnl_queue_net_id __read_mostly;
81
82 #define INSTANCE_BUCKETS 16
83 struct nfnl_queue_net {
84 spinlock_t instances_lock;
85 struct hlist_head instance_table[INSTANCE_BUCKETS];
86 };
87
88 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
89 {
90 return net_generic(net, nfnl_queue_net_id);
91 }
92
93 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
94 {
95 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
96 }
97
98 static struct nfqnl_instance *
99 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
100 {
101 struct hlist_head *head;
102 struct nfqnl_instance *inst;
103
104 head = &q->instance_table[instance_hashfn(queue_num)];
105 hlist_for_each_entry_rcu(inst, head, hlist) {
106 if (inst->queue_num == queue_num)
107 return inst;
108 }
109 return NULL;
110 }
111
112 static struct nfqnl_instance *
113 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
114 {
115 struct nfqnl_instance *inst;
116 unsigned int h;
117 int err;
118
119 spin_lock(&q->instances_lock);
120 if (instance_lookup(q, queue_num)) {
121 err = -EEXIST;
122 goto out_unlock;
123 }
124
125 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
126 if (!inst) {
127 err = -ENOMEM;
128 goto out_unlock;
129 }
130
131 inst->queue_num = queue_num;
132 inst->peer_portid = portid;
133 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
134 inst->copy_range = NFQNL_MAX_COPY_RANGE;
135 inst->copy_mode = NFQNL_COPY_NONE;
136 spin_lock_init(&inst->lock);
137 INIT_LIST_HEAD(&inst->queue_list);
138
139 if (!try_module_get(THIS_MODULE)) {
140 err = -EAGAIN;
141 goto out_free;
142 }
143
144 h = instance_hashfn(queue_num);
145 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
146
147 spin_unlock(&q->instances_lock);
148
149 return inst;
150
151 out_free:
152 kfree(inst);
153 out_unlock:
154 spin_unlock(&q->instances_lock);
155 return ERR_PTR(err);
156 }
157
158 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
159 unsigned long data);
160
161 static void
162 instance_destroy_rcu(struct rcu_head *head)
163 {
164 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
165 rcu);
166
167 nfqnl_flush(inst, NULL, 0);
168 kfree(inst);
169 module_put(THIS_MODULE);
170 }
171
172 static void
173 __instance_destroy(struct nfqnl_instance *inst)
174 {
175 hlist_del_rcu(&inst->hlist);
176 call_rcu(&inst->rcu, instance_destroy_rcu);
177 }
178
179 static void
180 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
181 {
182 spin_lock(&q->instances_lock);
183 __instance_destroy(inst);
184 spin_unlock(&q->instances_lock);
185 }
186
187 static inline void
188 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
189 {
190 list_add_tail(&entry->list, &queue->queue_list);
191 queue->queue_total++;
192 }
193
194 static void
195 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
196 {
197 list_del(&entry->list);
198 queue->queue_total--;
199 }
200
201 static struct nf_queue_entry *
202 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
203 {
204 struct nf_queue_entry *entry = NULL, *i;
205
206 spin_lock_bh(&queue->lock);
207
208 list_for_each_entry(i, &queue->queue_list, list) {
209 if (i->id == id) {
210 entry = i;
211 break;
212 }
213 }
214
215 if (entry)
216 __dequeue_entry(queue, entry);
217
218 spin_unlock_bh(&queue->lock);
219
220 return entry;
221 }
222
223 static void
224 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
225 {
226 struct nf_queue_entry *entry, *next;
227
228 spin_lock_bh(&queue->lock);
229 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
230 if (!cmpfn || cmpfn(entry, data)) {
231 list_del(&entry->list);
232 queue->queue_total--;
233 nf_reinject(entry, NF_DROP);
234 }
235 }
236 spin_unlock_bh(&queue->lock);
237 }
238
239 static int
240 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
241 bool csum_verify)
242 {
243 __u32 flags = 0;
244
245 if (packet->ip_summed == CHECKSUM_PARTIAL)
246 flags = NFQA_SKB_CSUMNOTREADY;
247 else if (csum_verify)
248 flags = NFQA_SKB_CSUM_NOTVERIFIED;
249
250 if (skb_is_gso(packet))
251 flags |= NFQA_SKB_GSO;
252
253 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
254 }
255
256 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
257 {
258 const struct cred *cred;
259
260 if (!sk_fullsock(sk))
261 return 0;
262
263 read_lock_bh(&sk->sk_callback_lock);
264 if (sk->sk_socket && sk->sk_socket->file) {
265 cred = sk->sk_socket->file->f_cred;
266 if (nla_put_be32(skb, NFQA_UID,
267 htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
268 goto nla_put_failure;
269 if (nla_put_be32(skb, NFQA_GID,
270 htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
271 goto nla_put_failure;
272 }
273 read_unlock_bh(&sk->sk_callback_lock);
274 return 0;
275
276 nla_put_failure:
277 read_unlock_bh(&sk->sk_callback_lock);
278 return -1;
279 }
280
281 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
282 {
283 u32 seclen = 0;
284 #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
285 if (!skb || !sk_fullsock(skb->sk))
286 return 0;
287
288 read_lock_bh(&skb->sk->sk_callback_lock);
289
290 if (skb->secmark)
291 security_secid_to_secctx(skb->secmark, secdata, &seclen);
292
293 read_unlock_bh(&skb->sk->sk_callback_lock);
294 #endif
295 return seclen;
296 }
297
298 static struct sk_buff *
299 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
300 struct nf_queue_entry *entry,
301 __be32 **packet_id_ptr)
302 {
303 size_t size;
304 size_t data_len = 0, cap_len = 0, rem_len = 0;
305 unsigned int hlen = 0;
306 struct sk_buff *skb;
307 struct nlattr *nla;
308 struct nfqnl_msg_packet_hdr *pmsg;
309 struct nlmsghdr *nlh;
310 struct nfgenmsg *nfmsg;
311 struct sk_buff *entskb = entry->skb;
312 struct net_device *indev;
313 struct net_device *outdev;
314 struct nf_conn *ct = NULL;
315 enum ip_conntrack_info uninitialized_var(ctinfo);
316 struct nfnl_ct_hook *nfnl_ct;
317 bool csum_verify;
318 char *secdata = NULL;
319 u32 seclen = 0;
320
321 size = nlmsg_total_size(sizeof(struct nfgenmsg))
322 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
323 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
324 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
325 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
326 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
327 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
328 #endif
329 + nla_total_size(sizeof(u_int32_t)) /* mark */
330 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
331 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
332 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
333
334 if (entskb->tstamp.tv64)
335 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
336
337 if (entry->state.hook <= NF_INET_FORWARD ||
338 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
339 csum_verify = !skb_csum_unnecessary(entskb);
340 else
341 csum_verify = false;
342
343 outdev = entry->state.out;
344
345 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
346 case NFQNL_COPY_META:
347 case NFQNL_COPY_NONE:
348 break;
349
350 case NFQNL_COPY_PACKET:
351 if (!(queue->flags & NFQA_CFG_F_GSO) &&
352 entskb->ip_summed == CHECKSUM_PARTIAL &&
353 skb_checksum_help(entskb))
354 return NULL;
355
356 data_len = ACCESS_ONCE(queue->copy_range);
357 if (data_len > entskb->len)
358 data_len = entskb->len;
359
360 hlen = skb_zerocopy_headlen(entskb);
361 hlen = min_t(unsigned int, hlen, data_len);
362 size += sizeof(struct nlattr) + hlen;
363 cap_len = entskb->len;
364 rem_len = data_len - hlen;
365 break;
366 }
367
368 if (queue->flags & NFQA_CFG_F_CONNTRACK) {
369 nfnl_ct = rcu_dereference(nfnl_ct_hook);
370 if (nfnl_ct != NULL) {
371 ct = nfnl_ct->get_ct(entskb, &ctinfo);
372 if (ct != NULL)
373 size += nfnl_ct->build_size(ct);
374 }
375 }
376
377 if (queue->flags & NFQA_CFG_F_UID_GID) {
378 size += (nla_total_size(sizeof(u_int32_t)) /* uid */
379 + nla_total_size(sizeof(u_int32_t))); /* gid */
380 }
381
382 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
383 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
384 if (seclen)
385 size += nla_total_size(seclen);
386 }
387
388 skb = __netlink_alloc_skb(net->nfnl, size, rem_len, queue->peer_portid,
389 GFP_ATOMIC);
390 if (!skb) {
391 skb_tx_error(entskb);
392 return NULL;
393 }
394
395 nlh = nlmsg_put(skb, 0, 0,
396 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
397 sizeof(struct nfgenmsg), 0);
398 if (!nlh) {
399 skb_tx_error(entskb);
400 kfree_skb(skb);
401 return NULL;
402 }
403 nfmsg = nlmsg_data(nlh);
404 nfmsg->nfgen_family = entry->state.pf;
405 nfmsg->version = NFNETLINK_V0;
406 nfmsg->res_id = htons(queue->queue_num);
407
408 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
409 pmsg = nla_data(nla);
410 pmsg->hw_protocol = entskb->protocol;
411 pmsg->hook = entry->state.hook;
412 *packet_id_ptr = &pmsg->packet_id;
413
414 indev = entry->state.in;
415 if (indev) {
416 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
417 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
418 goto nla_put_failure;
419 #else
420 if (entry->state.pf == PF_BRIDGE) {
421 /* Case 1: indev is physical input device, we need to
422 * look for bridge group (when called from
423 * netfilter_bridge) */
424 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
425 htonl(indev->ifindex)) ||
426 /* this is the bridge group "brX" */
427 /* rcu_read_lock()ed by __nf_queue */
428 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
429 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
430 goto nla_put_failure;
431 } else {
432 int physinif;
433
434 /* Case 2: indev is bridge group, we need to look for
435 * physical device (when called from ipv4) */
436 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
437 htonl(indev->ifindex)))
438 goto nla_put_failure;
439
440 physinif = nf_bridge_get_physinif(entskb);
441 if (physinif &&
442 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
443 htonl(physinif)))
444 goto nla_put_failure;
445 }
446 #endif
447 }
448
449 if (outdev) {
450 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
451 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
452 goto nla_put_failure;
453 #else
454 if (entry->state.pf == PF_BRIDGE) {
455 /* Case 1: outdev is physical output device, we need to
456 * look for bridge group (when called from
457 * netfilter_bridge) */
458 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
459 htonl(outdev->ifindex)) ||
460 /* this is the bridge group "brX" */
461 /* rcu_read_lock()ed by __nf_queue */
462 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
463 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
464 goto nla_put_failure;
465 } else {
466 int physoutif;
467
468 /* Case 2: outdev is bridge group, we need to look for
469 * physical output device (when called from ipv4) */
470 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
471 htonl(outdev->ifindex)))
472 goto nla_put_failure;
473
474 physoutif = nf_bridge_get_physoutif(entskb);
475 if (physoutif &&
476 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
477 htonl(physoutif)))
478 goto nla_put_failure;
479 }
480 #endif
481 }
482
483 if (entskb->mark &&
484 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
485 goto nla_put_failure;
486
487 if (indev && entskb->dev &&
488 entskb->mac_header != entskb->network_header) {
489 struct nfqnl_msg_packet_hw phw;
490 int len;
491
492 memset(&phw, 0, sizeof(phw));
493 len = dev_parse_header(entskb, phw.hw_addr);
494 if (len) {
495 phw.hw_addrlen = htons(len);
496 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
497 goto nla_put_failure;
498 }
499 }
500
501 if (entskb->tstamp.tv64) {
502 struct nfqnl_msg_packet_timestamp ts;
503 struct timespec64 kts = ktime_to_timespec64(skb->tstamp);
504
505 ts.sec = cpu_to_be64(kts.tv_sec);
506 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
507
508 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
509 goto nla_put_failure;
510 }
511
512 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
513 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
514 goto nla_put_failure;
515
516 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
517 goto nla_put_failure;
518
519 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
520 goto nla_put_failure;
521
522 if (cap_len > data_len &&
523 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
524 goto nla_put_failure;
525
526 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
527 goto nla_put_failure;
528
529 if (data_len) {
530 struct nlattr *nla;
531
532 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
533 goto nla_put_failure;
534
535 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
536 nla->nla_type = NFQA_PAYLOAD;
537 nla->nla_len = nla_attr_size(data_len);
538
539 if (skb_zerocopy(skb, entskb, data_len, hlen))
540 goto nla_put_failure;
541 }
542
543 nlh->nlmsg_len = skb->len;
544 return skb;
545
546 nla_put_failure:
547 skb_tx_error(entskb);
548 kfree_skb(skb);
549 net_err_ratelimited("nf_queue: error creating packet message\n");
550 return NULL;
551 }
552
553 static int
554 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
555 struct nf_queue_entry *entry)
556 {
557 struct sk_buff *nskb;
558 int err = -ENOBUFS;
559 __be32 *packet_id_ptr;
560 int failopen = 0;
561
562 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
563 if (nskb == NULL) {
564 err = -ENOMEM;
565 goto err_out;
566 }
567 spin_lock_bh(&queue->lock);
568
569 if (queue->queue_total >= queue->queue_maxlen) {
570 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
571 failopen = 1;
572 err = 0;
573 } else {
574 queue->queue_dropped++;
575 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
576 queue->queue_total);
577 }
578 goto err_out_free_nskb;
579 }
580 entry->id = ++queue->id_sequence;
581 *packet_id_ptr = htonl(entry->id);
582
583 /* nfnetlink_unicast will either free the nskb or add it to a socket */
584 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
585 if (err < 0) {
586 queue->queue_user_dropped++;
587 goto err_out_unlock;
588 }
589
590 __enqueue_entry(queue, entry);
591
592 spin_unlock_bh(&queue->lock);
593 return 0;
594
595 err_out_free_nskb:
596 kfree_skb(nskb);
597 err_out_unlock:
598 spin_unlock_bh(&queue->lock);
599 if (failopen)
600 nf_reinject(entry, NF_ACCEPT);
601 err_out:
602 return err;
603 }
604
605 static struct nf_queue_entry *
606 nf_queue_entry_dup(struct nf_queue_entry *e)
607 {
608 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
609 if (entry)
610 nf_queue_entry_get_refs(entry);
611 return entry;
612 }
613
614 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
615 /* When called from bridge netfilter, skb->data must point to MAC header
616 * before calling skb_gso_segment(). Else, original MAC header is lost
617 * and segmented skbs will be sent to wrong destination.
618 */
619 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
620 {
621 if (skb->nf_bridge)
622 __skb_push(skb, skb->network_header - skb->mac_header);
623 }
624
625 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
626 {
627 if (skb->nf_bridge)
628 __skb_pull(skb, skb->network_header - skb->mac_header);
629 }
630 #else
631 #define nf_bridge_adjust_skb_data(s) do {} while (0)
632 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
633 #endif
634
635 static void free_entry(struct nf_queue_entry *entry)
636 {
637 nf_queue_entry_release_refs(entry);
638 kfree(entry);
639 }
640
641 static int
642 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
643 struct sk_buff *skb, struct nf_queue_entry *entry)
644 {
645 int ret = -ENOMEM;
646 struct nf_queue_entry *entry_seg;
647
648 nf_bridge_adjust_segmented_data(skb);
649
650 if (skb->next == NULL) { /* last packet, no need to copy entry */
651 struct sk_buff *gso_skb = entry->skb;
652 entry->skb = skb;
653 ret = __nfqnl_enqueue_packet(net, queue, entry);
654 if (ret)
655 entry->skb = gso_skb;
656 return ret;
657 }
658
659 skb->next = NULL;
660
661 entry_seg = nf_queue_entry_dup(entry);
662 if (entry_seg) {
663 entry_seg->skb = skb;
664 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
665 if (ret)
666 free_entry(entry_seg);
667 }
668 return ret;
669 }
670
671 static int
672 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
673 {
674 unsigned int queued;
675 struct nfqnl_instance *queue;
676 struct sk_buff *skb, *segs;
677 int err = -ENOBUFS;
678 struct net *net = entry->state.net;
679 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
680
681 /* rcu_read_lock()ed by nf_hook_slow() */
682 queue = instance_lookup(q, queuenum);
683 if (!queue)
684 return -ESRCH;
685
686 if (queue->copy_mode == NFQNL_COPY_NONE)
687 return -EINVAL;
688
689 skb = entry->skb;
690
691 switch (entry->state.pf) {
692 case NFPROTO_IPV4:
693 skb->protocol = htons(ETH_P_IP);
694 break;
695 case NFPROTO_IPV6:
696 skb->protocol = htons(ETH_P_IPV6);
697 break;
698 }
699
700 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
701 return __nfqnl_enqueue_packet(net, queue, entry);
702
703 nf_bridge_adjust_skb_data(skb);
704 segs = skb_gso_segment(skb, 0);
705 /* Does not use PTR_ERR to limit the number of error codes that can be
706 * returned by nf_queue. For instance, callers rely on -ESRCH to
707 * mean 'ignore this hook'.
708 */
709 if (IS_ERR_OR_NULL(segs))
710 goto out_err;
711 queued = 0;
712 err = 0;
713 do {
714 struct sk_buff *nskb = segs->next;
715 if (err == 0)
716 err = __nfqnl_enqueue_packet_gso(net, queue,
717 segs, entry);
718 if (err == 0)
719 queued++;
720 else
721 kfree_skb(segs);
722 segs = nskb;
723 } while (segs);
724
725 if (queued) {
726 if (err) /* some segments are already queued */
727 free_entry(entry);
728 kfree_skb(skb);
729 return 0;
730 }
731 out_err:
732 nf_bridge_adjust_segmented_data(skb);
733 return err;
734 }
735
736 static int
737 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
738 {
739 struct sk_buff *nskb;
740
741 if (diff < 0) {
742 if (pskb_trim(e->skb, data_len))
743 return -ENOMEM;
744 } else if (diff > 0) {
745 if (data_len > 0xFFFF)
746 return -EINVAL;
747 if (diff > skb_tailroom(e->skb)) {
748 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
749 diff, GFP_ATOMIC);
750 if (!nskb) {
751 printk(KERN_WARNING "nf_queue: OOM "
752 "in mangle, dropping packet\n");
753 return -ENOMEM;
754 }
755 kfree_skb(e->skb);
756 e->skb = nskb;
757 }
758 skb_put(e->skb, diff);
759 }
760 if (!skb_make_writable(e->skb, data_len))
761 return -ENOMEM;
762 skb_copy_to_linear_data(e->skb, data, data_len);
763 e->skb->ip_summed = CHECKSUM_NONE;
764 return 0;
765 }
766
767 static int
768 nfqnl_set_mode(struct nfqnl_instance *queue,
769 unsigned char mode, unsigned int range)
770 {
771 int status = 0;
772
773 spin_lock_bh(&queue->lock);
774 switch (mode) {
775 case NFQNL_COPY_NONE:
776 case NFQNL_COPY_META:
777 queue->copy_mode = mode;
778 queue->copy_range = 0;
779 break;
780
781 case NFQNL_COPY_PACKET:
782 queue->copy_mode = mode;
783 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
784 queue->copy_range = NFQNL_MAX_COPY_RANGE;
785 else
786 queue->copy_range = range;
787 break;
788
789 default:
790 status = -EINVAL;
791
792 }
793 spin_unlock_bh(&queue->lock);
794
795 return status;
796 }
797
798 static int
799 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
800 {
801 if (entry->state.in)
802 if (entry->state.in->ifindex == ifindex)
803 return 1;
804 if (entry->state.out)
805 if (entry->state.out->ifindex == ifindex)
806 return 1;
807 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
808 if (entry->skb->nf_bridge) {
809 int physinif, physoutif;
810
811 physinif = nf_bridge_get_physinif(entry->skb);
812 physoutif = nf_bridge_get_physoutif(entry->skb);
813
814 if (physinif == ifindex || physoutif == ifindex)
815 return 1;
816 }
817 #endif
818 return 0;
819 }
820
821 /* drop all packets with either indev or outdev == ifindex from all queue
822 * instances */
823 static void
824 nfqnl_dev_drop(struct net *net, int ifindex)
825 {
826 int i;
827 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
828
829 rcu_read_lock();
830
831 for (i = 0; i < INSTANCE_BUCKETS; i++) {
832 struct nfqnl_instance *inst;
833 struct hlist_head *head = &q->instance_table[i];
834
835 hlist_for_each_entry_rcu(inst, head, hlist)
836 nfqnl_flush(inst, dev_cmp, ifindex);
837 }
838
839 rcu_read_unlock();
840 }
841
842 static int
843 nfqnl_rcv_dev_event(struct notifier_block *this,
844 unsigned long event, void *ptr)
845 {
846 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
847
848 /* Drop any packets associated with the downed device */
849 if (event == NETDEV_DOWN)
850 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
851 return NOTIFY_DONE;
852 }
853
854 static struct notifier_block nfqnl_dev_notifier = {
855 .notifier_call = nfqnl_rcv_dev_event,
856 };
857
858 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long ops_ptr)
859 {
860 return entry->elem == (struct nf_hook_ops *)ops_ptr;
861 }
862
863 static void nfqnl_nf_hook_drop(struct net *net, struct nf_hook_ops *hook)
864 {
865 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
866 int i;
867
868 rcu_read_lock();
869 for (i = 0; i < INSTANCE_BUCKETS; i++) {
870 struct nfqnl_instance *inst;
871 struct hlist_head *head = &q->instance_table[i];
872
873 hlist_for_each_entry_rcu(inst, head, hlist)
874 nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook);
875 }
876 rcu_read_unlock();
877 }
878
879 static int
880 nfqnl_rcv_nl_event(struct notifier_block *this,
881 unsigned long event, void *ptr)
882 {
883 struct netlink_notify *n = ptr;
884 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
885
886 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
887 int i;
888
889 /* destroy all instances for this portid */
890 spin_lock(&q->instances_lock);
891 for (i = 0; i < INSTANCE_BUCKETS; i++) {
892 struct hlist_node *t2;
893 struct nfqnl_instance *inst;
894 struct hlist_head *head = &q->instance_table[i];
895
896 hlist_for_each_entry_safe(inst, t2, head, hlist) {
897 if (n->portid == inst->peer_portid)
898 __instance_destroy(inst);
899 }
900 }
901 spin_unlock(&q->instances_lock);
902 }
903 return NOTIFY_DONE;
904 }
905
906 static struct notifier_block nfqnl_rtnl_notifier = {
907 .notifier_call = nfqnl_rcv_nl_event,
908 };
909
910 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
911 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
912 [NFQA_MARK] = { .type = NLA_U32 },
913 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
914 [NFQA_CT] = { .type = NLA_UNSPEC },
915 [NFQA_EXP] = { .type = NLA_UNSPEC },
916 };
917
918 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
919 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
920 [NFQA_MARK] = { .type = NLA_U32 },
921 };
922
923 static struct nfqnl_instance *
924 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
925 {
926 struct nfqnl_instance *queue;
927
928 queue = instance_lookup(q, queue_num);
929 if (!queue)
930 return ERR_PTR(-ENODEV);
931
932 if (queue->peer_portid != nlportid)
933 return ERR_PTR(-EPERM);
934
935 return queue;
936 }
937
938 static struct nfqnl_msg_verdict_hdr*
939 verdicthdr_get(const struct nlattr * const nfqa[])
940 {
941 struct nfqnl_msg_verdict_hdr *vhdr;
942 unsigned int verdict;
943
944 if (!nfqa[NFQA_VERDICT_HDR])
945 return NULL;
946
947 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
948 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
949 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
950 return NULL;
951 return vhdr;
952 }
953
954 static int nfq_id_after(unsigned int id, unsigned int max)
955 {
956 return (int)(id - max) > 0;
957 }
958
959 static int
960 nfqnl_recv_verdict_batch(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 struct nf_queue_entry *entry, *tmp;
966 unsigned int verdict, maxid;
967 struct nfqnl_msg_verdict_hdr *vhdr;
968 struct nfqnl_instance *queue;
969 LIST_HEAD(batch_list);
970 u16 queue_num = ntohs(nfmsg->res_id);
971
972 struct net *net = sock_net(ctnl);
973 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
974
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 maxid = ntohl(vhdr->id);
986
987 spin_lock_bh(&queue->lock);
988
989 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
990 if (nfq_id_after(entry->id, maxid))
991 break;
992 __dequeue_entry(queue, entry);
993 list_add_tail(&entry->list, &batch_list);
994 }
995
996 spin_unlock_bh(&queue->lock);
997
998 if (list_empty(&batch_list))
999 return -ENOENT;
1000
1001 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1002 if (nfqa[NFQA_MARK])
1003 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1004 nf_reinject(entry, verdict);
1005 }
1006 return 0;
1007 }
1008
1009 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
1010 const struct nlmsghdr *nlh,
1011 const struct nlattr * const nfqa[],
1012 struct nf_queue_entry *entry,
1013 enum ip_conntrack_info *ctinfo)
1014 {
1015 struct nf_conn *ct;
1016
1017 ct = nfnl_ct->get_ct(entry->skb, ctinfo);
1018 if (ct == NULL)
1019 return NULL;
1020
1021 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1022 return NULL;
1023
1024 if (nfqa[NFQA_EXP])
1025 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1026 NETLINK_CB(entry->skb).portid,
1027 nlmsg_report(nlh));
1028 return ct;
1029 }
1030
1031 static int
1032 nfqnl_recv_verdict(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
1039 struct nfqnl_msg_verdict_hdr *vhdr;
1040 struct nfqnl_instance *queue;
1041 unsigned int verdict;
1042 struct nf_queue_entry *entry;
1043 enum ip_conntrack_info uninitialized_var(ctinfo);
1044 struct nfnl_ct_hook *nfnl_ct;
1045 struct nf_conn *ct = NULL;
1046
1047 struct net *net = sock_net(ctnl);
1048 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1049
1050 queue = instance_lookup(q, queue_num);
1051 if (!queue)
1052 queue = verdict_instance_lookup(q, queue_num,
1053 NETLINK_CB(skb).portid);
1054 if (IS_ERR(queue))
1055 return PTR_ERR(queue);
1056
1057 vhdr = verdicthdr_get(nfqa);
1058 if (!vhdr)
1059 return -EINVAL;
1060
1061 verdict = ntohl(vhdr->verdict);
1062
1063 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1064 if (entry == NULL)
1065 return -ENOENT;
1066
1067 if (nfqa[NFQA_CT]) {
1068 /* rcu lock already held from nfnl->call_rcu. */
1069 nfnl_ct = rcu_dereference(nfnl_ct_hook);
1070 if (nfnl_ct != NULL)
1071 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
1072 }
1073
1074 if (nfqa[NFQA_PAYLOAD]) {
1075 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1076 int diff = payload_len - entry->skb->len;
1077
1078 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1079 payload_len, entry, diff) < 0)
1080 verdict = NF_DROP;
1081
1082 if (ct && diff)
1083 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1084 }
1085
1086 if (nfqa[NFQA_MARK])
1087 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1088
1089 nf_reinject(entry, verdict);
1090 return 0;
1091 }
1092
1093 static int
1094 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1095 const struct nlmsghdr *nlh,
1096 const struct nlattr * const nfqa[])
1097 {
1098 return -ENOTSUPP;
1099 }
1100
1101 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1102 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1103 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1104 };
1105
1106 static const struct nf_queue_handler nfqh = {
1107 .outfn = &nfqnl_enqueue_packet,
1108 .nf_hook_drop = &nfqnl_nf_hook_drop,
1109 };
1110
1111 static int
1112 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1113 const struct nlmsghdr *nlh,
1114 const struct nlattr * const nfqa[])
1115 {
1116 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1117 u_int16_t queue_num = ntohs(nfmsg->res_id);
1118 struct nfqnl_instance *queue;
1119 struct nfqnl_msg_config_cmd *cmd = NULL;
1120 struct net *net = sock_net(ctnl);
1121 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1122 int ret = 0;
1123
1124 if (nfqa[NFQA_CFG_CMD]) {
1125 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1126
1127 /* Obsolete commands without queue context */
1128 switch (cmd->command) {
1129 case NFQNL_CFG_CMD_PF_BIND: return 0;
1130 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1131 }
1132 }
1133
1134 rcu_read_lock();
1135 queue = instance_lookup(q, queue_num);
1136 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1137 ret = -EPERM;
1138 goto err_out_unlock;
1139 }
1140
1141 if (cmd != NULL) {
1142 switch (cmd->command) {
1143 case NFQNL_CFG_CMD_BIND:
1144 if (queue) {
1145 ret = -EBUSY;
1146 goto err_out_unlock;
1147 }
1148 queue = instance_create(q, queue_num,
1149 NETLINK_CB(skb).portid);
1150 if (IS_ERR(queue)) {
1151 ret = PTR_ERR(queue);
1152 goto err_out_unlock;
1153 }
1154 break;
1155 case NFQNL_CFG_CMD_UNBIND:
1156 if (!queue) {
1157 ret = -ENODEV;
1158 goto err_out_unlock;
1159 }
1160 instance_destroy(q, queue);
1161 break;
1162 case NFQNL_CFG_CMD_PF_BIND:
1163 case NFQNL_CFG_CMD_PF_UNBIND:
1164 break;
1165 default:
1166 ret = -ENOTSUPP;
1167 break;
1168 }
1169 }
1170
1171 if (nfqa[NFQA_CFG_PARAMS]) {
1172 struct nfqnl_msg_config_params *params;
1173
1174 if (!queue) {
1175 ret = -ENODEV;
1176 goto err_out_unlock;
1177 }
1178 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1179 nfqnl_set_mode(queue, params->copy_mode,
1180 ntohl(params->copy_range));
1181 }
1182
1183 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1184 __be32 *queue_maxlen;
1185
1186 if (!queue) {
1187 ret = -ENODEV;
1188 goto err_out_unlock;
1189 }
1190 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1191 spin_lock_bh(&queue->lock);
1192 queue->queue_maxlen = ntohl(*queue_maxlen);
1193 spin_unlock_bh(&queue->lock);
1194 }
1195
1196 if (nfqa[NFQA_CFG_FLAGS]) {
1197 __u32 flags, mask;
1198
1199 if (!queue) {
1200 ret = -ENODEV;
1201 goto err_out_unlock;
1202 }
1203
1204 if (!nfqa[NFQA_CFG_MASK]) {
1205 /* A mask is needed to specify which flags are being
1206 * changed.
1207 */
1208 ret = -EINVAL;
1209 goto err_out_unlock;
1210 }
1211
1212 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1213 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1214
1215 if (flags >= NFQA_CFG_F_MAX) {
1216 ret = -EOPNOTSUPP;
1217 goto err_out_unlock;
1218 }
1219 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1220 if (flags & mask & NFQA_CFG_F_SECCTX) {
1221 ret = -EOPNOTSUPP;
1222 goto err_out_unlock;
1223 }
1224 #endif
1225 spin_lock_bh(&queue->lock);
1226 queue->flags &= ~mask;
1227 queue->flags |= flags & mask;
1228 spin_unlock_bh(&queue->lock);
1229 }
1230
1231 err_out_unlock:
1232 rcu_read_unlock();
1233 return ret;
1234 }
1235
1236 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1237 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1238 .attr_count = NFQA_MAX, },
1239 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1240 .attr_count = NFQA_MAX,
1241 .policy = nfqa_verdict_policy },
1242 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1243 .attr_count = NFQA_CFG_MAX,
1244 .policy = nfqa_cfg_policy },
1245 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1246 .attr_count = NFQA_MAX,
1247 .policy = nfqa_verdict_batch_policy },
1248 };
1249
1250 static const struct nfnetlink_subsystem nfqnl_subsys = {
1251 .name = "nf_queue",
1252 .subsys_id = NFNL_SUBSYS_QUEUE,
1253 .cb_count = NFQNL_MSG_MAX,
1254 .cb = nfqnl_cb,
1255 };
1256
1257 #ifdef CONFIG_PROC_FS
1258 struct iter_state {
1259 struct seq_net_private p;
1260 unsigned int bucket;
1261 };
1262
1263 static struct hlist_node *get_first(struct seq_file *seq)
1264 {
1265 struct iter_state *st = seq->private;
1266 struct net *net;
1267 struct nfnl_queue_net *q;
1268
1269 if (!st)
1270 return NULL;
1271
1272 net = seq_file_net(seq);
1273 q = nfnl_queue_pernet(net);
1274 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1275 if (!hlist_empty(&q->instance_table[st->bucket]))
1276 return q->instance_table[st->bucket].first;
1277 }
1278 return NULL;
1279 }
1280
1281 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1282 {
1283 struct iter_state *st = seq->private;
1284 struct net *net = seq_file_net(seq);
1285
1286 h = h->next;
1287 while (!h) {
1288 struct nfnl_queue_net *q;
1289
1290 if (++st->bucket >= INSTANCE_BUCKETS)
1291 return NULL;
1292
1293 q = nfnl_queue_pernet(net);
1294 h = q->instance_table[st->bucket].first;
1295 }
1296 return h;
1297 }
1298
1299 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1300 {
1301 struct hlist_node *head;
1302 head = get_first(seq);
1303
1304 if (head)
1305 while (pos && (head = get_next(seq, head)))
1306 pos--;
1307 return pos ? NULL : head;
1308 }
1309
1310 static void *seq_start(struct seq_file *s, loff_t *pos)
1311 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1312 {
1313 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1314 return get_idx(s, *pos);
1315 }
1316
1317 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1318 {
1319 (*pos)++;
1320 return get_next(s, v);
1321 }
1322
1323 static void seq_stop(struct seq_file *s, void *v)
1324 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1325 {
1326 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1327 }
1328
1329 static int seq_show(struct seq_file *s, void *v)
1330 {
1331 const struct nfqnl_instance *inst = v;
1332
1333 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1334 inst->queue_num,
1335 inst->peer_portid, inst->queue_total,
1336 inst->copy_mode, inst->copy_range,
1337 inst->queue_dropped, inst->queue_user_dropped,
1338 inst->id_sequence, 1);
1339 return 0;
1340 }
1341
1342 static const struct seq_operations nfqnl_seq_ops = {
1343 .start = seq_start,
1344 .next = seq_next,
1345 .stop = seq_stop,
1346 .show = seq_show,
1347 };
1348
1349 static int nfqnl_open(struct inode *inode, struct file *file)
1350 {
1351 return seq_open_net(inode, file, &nfqnl_seq_ops,
1352 sizeof(struct iter_state));
1353 }
1354
1355 static const struct file_operations nfqnl_file_ops = {
1356 .owner = THIS_MODULE,
1357 .open = nfqnl_open,
1358 .read = seq_read,
1359 .llseek = seq_lseek,
1360 .release = seq_release_net,
1361 };
1362
1363 #endif /* PROC_FS */
1364
1365 static int __net_init nfnl_queue_net_init(struct net *net)
1366 {
1367 unsigned int i;
1368 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1369
1370 for (i = 0; i < INSTANCE_BUCKETS; i++)
1371 INIT_HLIST_HEAD(&q->instance_table[i]);
1372
1373 spin_lock_init(&q->instances_lock);
1374
1375 #ifdef CONFIG_PROC_FS
1376 if (!proc_create("nfnetlink_queue", 0440,
1377 net->nf.proc_netfilter, &nfqnl_file_ops))
1378 return -ENOMEM;
1379 #endif
1380 return 0;
1381 }
1382
1383 static void __net_exit nfnl_queue_net_exit(struct net *net)
1384 {
1385 #ifdef CONFIG_PROC_FS
1386 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1387 #endif
1388 }
1389
1390 static struct pernet_operations nfnl_queue_net_ops = {
1391 .init = nfnl_queue_net_init,
1392 .exit = nfnl_queue_net_exit,
1393 .id = &nfnl_queue_net_id,
1394 .size = sizeof(struct nfnl_queue_net),
1395 };
1396
1397 static int __init nfnetlink_queue_init(void)
1398 {
1399 int status;
1400
1401 status = register_pernet_subsys(&nfnl_queue_net_ops);
1402 if (status < 0) {
1403 pr_err("nf_queue: failed to register pernet ops\n");
1404 goto out;
1405 }
1406
1407 netlink_register_notifier(&nfqnl_rtnl_notifier);
1408 status = nfnetlink_subsys_register(&nfqnl_subsys);
1409 if (status < 0) {
1410 pr_err("nf_queue: failed to create netlink socket\n");
1411 goto cleanup_netlink_notifier;
1412 }
1413
1414 register_netdevice_notifier(&nfqnl_dev_notifier);
1415 nf_register_queue_handler(&nfqh);
1416 return status;
1417
1418 cleanup_netlink_notifier:
1419 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1420 out:
1421 return status;
1422 }
1423
1424 static void __exit nfnetlink_queue_fini(void)
1425 {
1426 nf_unregister_queue_handler();
1427 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1428 nfnetlink_subsys_unregister(&nfqnl_subsys);
1429 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1430 unregister_pernet_subsys(&nfnl_queue_net_ops);
1431
1432 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1433 }
1434
1435 MODULE_DESCRIPTION("netfilter packet queue handler");
1436 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1437 MODULE_LICENSE("GPL");
1438 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1439
1440 module_init(nfnetlink_queue_init);
1441 module_exit(nfnetlink_queue_fini);
Linux kernel - Deliverables
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