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ip: fix warning in xfrm4_mode_tunnel_input
[linux-2.6/btrfs-unstable.git] / net / netfilter / nfnetlink_queue_core.c
blob3158d87b56a816112ad71bb675d61a5e8c07305b
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/netfilter/nfnetlink_queue.h>
34
35 #include <linux/atomic.h>
36
37 #ifdef CONFIG_BRIDGE_NETFILTER
38 #include "../bridge/br_private.h"
39 #endif
40
41 #define NFQNL_QMAX_DEFAULT 1024
42
43 struct nfqnl_instance {
44 struct hlist_node hlist; /* global list of queues */
45 struct rcu_head rcu;
46
47 int peer_portid;
48 unsigned int queue_maxlen;
49 unsigned int copy_range;
50 unsigned int queue_dropped;
51 unsigned int queue_user_dropped;
52
53
54 u_int16_t queue_num; /* number of this queue */
55 u_int8_t copy_mode;
56 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
57 /*
58 * Following fields are dirtied for each queued packet,
59 * keep them in same cache line if possible.
60 */
61 spinlock_t lock;
62 unsigned int queue_total;
63 unsigned int id_sequence; /* 'sequence' of pkt ids */
64 struct list_head queue_list; /* packets in queue */
65 };
66
67 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
68
69 static DEFINE_SPINLOCK(instances_lock);
70
71 #define INSTANCE_BUCKETS 16
72 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
73
74 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
75 {
76 return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
77 }
78
79 static struct nfqnl_instance *
80 instance_lookup(u_int16_t queue_num)
81 {
82 struct hlist_head *head;
83 struct hlist_node *pos;
84 struct nfqnl_instance *inst;
85
86 head = &instance_table[instance_hashfn(queue_num)];
87 hlist_for_each_entry_rcu(inst, pos, head, hlist) {
88 if (inst->queue_num == queue_num)
89 return inst;
90 }
91 return NULL;
92 }
93
94 static struct nfqnl_instance *
95 instance_create(u_int16_t queue_num, int portid)
96 {
97 struct nfqnl_instance *inst;
98 unsigned int h;
99 int err;
100
101 spin_lock(&instances_lock);
102 if (instance_lookup(queue_num)) {
103 err = -EEXIST;
104 goto out_unlock;
105 }
106
107 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
108 if (!inst) {
109 err = -ENOMEM;
110 goto out_unlock;
111 }
112
113 inst->queue_num = queue_num;
114 inst->peer_portid = portid;
115 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
116 inst->copy_range = 0xfffff;
117 inst->copy_mode = NFQNL_COPY_NONE;
118 spin_lock_init(&inst->lock);
119 INIT_LIST_HEAD(&inst->queue_list);
120
121 if (!try_module_get(THIS_MODULE)) {
122 err = -EAGAIN;
123 goto out_free;
124 }
125
126 h = instance_hashfn(queue_num);
127 hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
128
129 spin_unlock(&instances_lock);
130
131 return inst;
132
133 out_free:
134 kfree(inst);
135 out_unlock:
136 spin_unlock(&instances_lock);
137 return ERR_PTR(err);
138 }
139
140 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
141 unsigned long data);
142
143 static void
144 instance_destroy_rcu(struct rcu_head *head)
145 {
146 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
147 rcu);
148
149 nfqnl_flush(inst, NULL, 0);
150 kfree(inst);
151 module_put(THIS_MODULE);
152 }
153
154 static void
155 __instance_destroy(struct nfqnl_instance *inst)
156 {
157 hlist_del_rcu(&inst->hlist);
158 call_rcu(&inst->rcu, instance_destroy_rcu);
159 }
160
161 static void
162 instance_destroy(struct nfqnl_instance *inst)
163 {
164 spin_lock(&instances_lock);
165 __instance_destroy(inst);
166 spin_unlock(&instances_lock);
167 }
168
169 static inline void
170 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
171 {
172 list_add_tail(&entry->list, &queue->queue_list);
173 queue->queue_total++;
174 }
175
176 static void
177 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
178 {
179 list_del(&entry->list);
180 queue->queue_total--;
181 }
182
183 static struct nf_queue_entry *
184 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
185 {
186 struct nf_queue_entry *entry = NULL, *i;
187
188 spin_lock_bh(&queue->lock);
189
190 list_for_each_entry(i, &queue->queue_list, list) {
191 if (i->id == id) {
192 entry = i;
193 break;
194 }
195 }
196
197 if (entry)
198 __dequeue_entry(queue, entry);
199
200 spin_unlock_bh(&queue->lock);
201
202 return entry;
203 }
204
205 static void
206 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
207 {
208 struct nf_queue_entry *entry, *next;
209
210 spin_lock_bh(&queue->lock);
211 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
212 if (!cmpfn || cmpfn(entry, data)) {
213 list_del(&entry->list);
214 queue->queue_total--;
215 nf_reinject(entry, NF_DROP);
216 }
217 }
218 spin_unlock_bh(&queue->lock);
219 }
220
221 static struct sk_buff *
222 nfqnl_build_packet_message(struct nfqnl_instance *queue,
223 struct nf_queue_entry *entry,
224 __be32 **packet_id_ptr)
225 {
226 sk_buff_data_t old_tail;
227 size_t size;
228 size_t data_len = 0, cap_len = 0;
229 struct sk_buff *skb;
230 struct nlattr *nla;
231 struct nfqnl_msg_packet_hdr *pmsg;
232 struct nlmsghdr *nlh;
233 struct nfgenmsg *nfmsg;
234 struct sk_buff *entskb = entry->skb;
235 struct net_device *indev;
236 struct net_device *outdev;
237 struct nf_conn *ct = NULL;
238 enum ip_conntrack_info uninitialized_var(ctinfo);
239
240 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
241 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
242 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
243 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
244 #ifdef CONFIG_BRIDGE_NETFILTER
245 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
246 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
247 #endif
248 + nla_total_size(sizeof(u_int32_t)) /* mark */
249 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
250 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)
251 + nla_total_size(sizeof(u_int32_t))); /* cap_len */
252
253 outdev = entry->outdev;
254
255 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
256 case NFQNL_COPY_META:
257 case NFQNL_COPY_NONE:
258 break;
259
260 case NFQNL_COPY_PACKET:
261 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
262 skb_checksum_help(entskb))
263 return NULL;
264
265 data_len = ACCESS_ONCE(queue->copy_range);
266 if (data_len == 0 || data_len > entskb->len)
267 data_len = entskb->len;
268
269 size += nla_total_size(data_len);
270 cap_len = entskb->len;
271 break;
272 }
273
274 if (queue->flags & NFQA_CFG_F_CONNTRACK)
275 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
276
277 skb = alloc_skb(size, GFP_ATOMIC);
278 if (!skb)
279 return NULL;
280
281 old_tail = skb->tail;
282 nlh = nlmsg_put(skb, 0, 0,
283 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
284 sizeof(struct nfgenmsg), 0);
285 if (!nlh) {
286 kfree_skb(skb);
287 return NULL;
288 }
289 nfmsg = nlmsg_data(nlh);
290 nfmsg->nfgen_family = entry->pf;
291 nfmsg->version = NFNETLINK_V0;
292 nfmsg->res_id = htons(queue->queue_num);
293
294 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
295 pmsg = nla_data(nla);
296 pmsg->hw_protocol = entskb->protocol;
297 pmsg->hook = entry->hook;
298 *packet_id_ptr = &pmsg->packet_id;
299
300 indev = entry->indev;
301 if (indev) {
302 #ifndef CONFIG_BRIDGE_NETFILTER
303 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
304 goto nla_put_failure;
305 #else
306 if (entry->pf == PF_BRIDGE) {
307 /* Case 1: indev is physical input device, we need to
308 * look for bridge group (when called from
309 * netfilter_bridge) */
310 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
311 htonl(indev->ifindex)) ||
312 /* this is the bridge group "brX" */
313 /* rcu_read_lock()ed by __nf_queue */
314 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
315 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
316 goto nla_put_failure;
317 } else {
318 /* Case 2: indev is bridge group, we need to look for
319 * physical device (when called from ipv4) */
320 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
321 htonl(indev->ifindex)))
322 goto nla_put_failure;
323 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
324 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
325 htonl(entskb->nf_bridge->physindev->ifindex)))
326 goto nla_put_failure;
327 }
328 #endif
329 }
330
331 if (outdev) {
332 #ifndef CONFIG_BRIDGE_NETFILTER
333 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
334 goto nla_put_failure;
335 #else
336 if (entry->pf == PF_BRIDGE) {
337 /* Case 1: outdev is physical output device, we need to
338 * look for bridge group (when called from
339 * netfilter_bridge) */
340 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
341 htonl(outdev->ifindex)) ||
342 /* this is the bridge group "brX" */
343 /* rcu_read_lock()ed by __nf_queue */
344 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
345 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
346 goto nla_put_failure;
347 } else {
348 /* Case 2: outdev is bridge group, we need to look for
349 * physical output device (when called from ipv4) */
350 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
351 htonl(outdev->ifindex)))
352 goto nla_put_failure;
353 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
354 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
355 htonl(entskb->nf_bridge->physoutdev->ifindex)))
356 goto nla_put_failure;
357 }
358 #endif
359 }
360
361 if (entskb->mark &&
362 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
363 goto nla_put_failure;
364
365 if (indev && entskb->dev &&
366 entskb->mac_header != entskb->network_header) {
367 struct nfqnl_msg_packet_hw phw;
368 int len = dev_parse_header(entskb, phw.hw_addr);
369 if (len) {
370 phw.hw_addrlen = htons(len);
371 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
372 goto nla_put_failure;
373 }
374 }
375
376 if (entskb->tstamp.tv64) {
377 struct nfqnl_msg_packet_timestamp ts;
378 struct timeval tv = ktime_to_timeval(entskb->tstamp);
379 ts.sec = cpu_to_be64(tv.tv_sec);
380 ts.usec = cpu_to_be64(tv.tv_usec);
381
382 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
383 goto nla_put_failure;
384 }
385
386 if (data_len) {
387 struct nlattr *nla;
388 int sz = nla_attr_size(data_len);
389
390 if (skb_tailroom(skb) < nla_total_size(data_len)) {
391 printk(KERN_WARNING "nf_queue: no tailroom!\n");
392 kfree_skb(skb);
393 return NULL;
394 }
395
396 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
397 nla->nla_type = NFQA_PAYLOAD;
398 nla->nla_len = sz;
399
400 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
401 BUG();
402 }
403
404 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
405 goto nla_put_failure;
406
407 if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
408 goto nla_put_failure;
409
410 nlh->nlmsg_len = skb->tail - old_tail;
411 return skb;
412
413 nla_put_failure:
414 kfree_skb(skb);
415 net_err_ratelimited("nf_queue: error creating packet message\n");
416 return NULL;
417 }
418
419 static int
420 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
421 {
422 struct sk_buff *nskb;
423 struct nfqnl_instance *queue;
424 int err = -ENOBUFS;
425 __be32 *packet_id_ptr;
426 int failopen = 0;
427
428 /* rcu_read_lock()ed by nf_hook_slow() */
429 queue = instance_lookup(queuenum);
430 if (!queue) {
431 err = -ESRCH;
432 goto err_out;
433 }
434
435 if (queue->copy_mode == NFQNL_COPY_NONE) {
436 err = -EINVAL;
437 goto err_out;
438 }
439
440 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
441 if (nskb == NULL) {
442 err = -ENOMEM;
443 goto err_out;
444 }
445 spin_lock_bh(&queue->lock);
446
447 if (!queue->peer_portid) {
448 err = -EINVAL;
449 goto err_out_free_nskb;
450 }
451 if (queue->queue_total >= queue->queue_maxlen) {
452 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
453 failopen = 1;
454 err = 0;
455 } else {
456 queue->queue_dropped++;
457 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
458 queue->queue_total);
459 }
460 goto err_out_free_nskb;
461 }
462 entry->id = ++queue->id_sequence;
463 *packet_id_ptr = htonl(entry->id);
464
465 /* nfnetlink_unicast will either free the nskb or add it to a socket */
466 err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT);
467 if (err < 0) {
468 queue->queue_user_dropped++;
469 goto err_out_unlock;
470 }
471
472 __enqueue_entry(queue, entry);
473
474 spin_unlock_bh(&queue->lock);
475 return 0;
476
477 err_out_free_nskb:
478 kfree_skb(nskb);
479 err_out_unlock:
480 spin_unlock_bh(&queue->lock);
481 if (failopen)
482 nf_reinject(entry, NF_ACCEPT);
483 err_out:
484 return err;
485 }
486
487 static int
488 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
489 {
490 struct sk_buff *nskb;
491
492 if (diff < 0) {
493 if (pskb_trim(e->skb, data_len))
494 return -ENOMEM;
495 } else if (diff > 0) {
496 if (data_len > 0xFFFF)
497 return -EINVAL;
498 if (diff > skb_tailroom(e->skb)) {
499 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
500 diff, GFP_ATOMIC);
501 if (!nskb) {
502 printk(KERN_WARNING "nf_queue: OOM "
503 "in mangle, dropping packet\n");
504 return -ENOMEM;
505 }
506 kfree_skb(e->skb);
507 e->skb = nskb;
508 }
509 skb_put(e->skb, diff);
510 }
511 if (!skb_make_writable(e->skb, data_len))
512 return -ENOMEM;
513 skb_copy_to_linear_data(e->skb, data, data_len);
514 e->skb->ip_summed = CHECKSUM_NONE;
515 return 0;
516 }
517
518 static int
519 nfqnl_set_mode(struct nfqnl_instance *queue,
520 unsigned char mode, unsigned int range)
521 {
522 int status = 0;
523
524 spin_lock_bh(&queue->lock);
525 switch (mode) {
526 case NFQNL_COPY_NONE:
527 case NFQNL_COPY_META:
528 queue->copy_mode = mode;
529 queue->copy_range = 0;
530 break;
531
532 case NFQNL_COPY_PACKET:
533 queue->copy_mode = mode;
534 /* We're using struct nlattr which has 16bit nla_len. Note that
535 * nla_len includes the header length. Thus, the maximum packet
536 * length that we support is 65531 bytes. We send truncated
537 * packets if the specified length is larger than that.
538 */
539 if (range > 0xffff - NLA_HDRLEN)
540 queue->copy_range = 0xffff - NLA_HDRLEN;
541 else
542 queue->copy_range = range;
543 break;
544
545 default:
546 status = -EINVAL;
547
548 }
549 spin_unlock_bh(&queue->lock);
550
551 return status;
552 }
553
554 static int
555 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
556 {
557 if (entry->indev)
558 if (entry->indev->ifindex == ifindex)
559 return 1;
560 if (entry->outdev)
561 if (entry->outdev->ifindex == ifindex)
562 return 1;
563 #ifdef CONFIG_BRIDGE_NETFILTER
564 if (entry->skb->nf_bridge) {
565 if (entry->skb->nf_bridge->physindev &&
566 entry->skb->nf_bridge->physindev->ifindex == ifindex)
567 return 1;
568 if (entry->skb->nf_bridge->physoutdev &&
569 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
570 return 1;
571 }
572 #endif
573 return 0;
574 }
575
576 /* drop all packets with either indev or outdev == ifindex from all queue
577 * instances */
578 static void
579 nfqnl_dev_drop(int ifindex)
580 {
581 int i;
582
583 rcu_read_lock();
584
585 for (i = 0; i < INSTANCE_BUCKETS; i++) {
586 struct hlist_node *tmp;
587 struct nfqnl_instance *inst;
588 struct hlist_head *head = &instance_table[i];
589
590 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
591 nfqnl_flush(inst, dev_cmp, ifindex);
592 }
593
594 rcu_read_unlock();
595 }
596
597 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
598
599 static int
600 nfqnl_rcv_dev_event(struct notifier_block *this,
601 unsigned long event, void *ptr)
602 {
603 struct net_device *dev = ptr;
604
605 if (!net_eq(dev_net(dev), &init_net))
606 return NOTIFY_DONE;
607
608 /* Drop any packets associated with the downed device */
609 if (event == NETDEV_DOWN)
610 nfqnl_dev_drop(dev->ifindex);
611 return NOTIFY_DONE;
612 }
613
614 static struct notifier_block nfqnl_dev_notifier = {
615 .notifier_call = nfqnl_rcv_dev_event,
616 };
617
618 static int
619 nfqnl_rcv_nl_event(struct notifier_block *this,
620 unsigned long event, void *ptr)
621 {
622 struct netlink_notify *n = ptr;
623
624 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
625 int i;
626
627 /* destroy all instances for this portid */
628 spin_lock(&instances_lock);
629 for (i = 0; i < INSTANCE_BUCKETS; i++) {
630 struct hlist_node *tmp, *t2;
631 struct nfqnl_instance *inst;
632 struct hlist_head *head = &instance_table[i];
633
634 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
635 if ((n->net == &init_net) &&
636 (n->portid == inst->peer_portid))
637 __instance_destroy(inst);
638 }
639 }
640 spin_unlock(&instances_lock);
641 }
642 return NOTIFY_DONE;
643 }
644
645 static struct notifier_block nfqnl_rtnl_notifier = {
646 .notifier_call = nfqnl_rcv_nl_event,
647 };
648
649 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
650 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
651 [NFQA_MARK] = { .type = NLA_U32 },
652 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
653 [NFQA_CT] = { .type = NLA_UNSPEC },
654 };
655
656 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
657 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
658 [NFQA_MARK] = { .type = NLA_U32 },
659 };
660
661 static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid)
662 {
663 struct nfqnl_instance *queue;
664
665 queue = instance_lookup(queue_num);
666 if (!queue)
667 return ERR_PTR(-ENODEV);
668
669 if (queue->peer_portid != nlportid)
670 return ERR_PTR(-EPERM);
671
672 return queue;
673 }
674
675 static struct nfqnl_msg_verdict_hdr*
676 verdicthdr_get(const struct nlattr * const nfqa[])
677 {
678 struct nfqnl_msg_verdict_hdr *vhdr;
679 unsigned int verdict;
680
681 if (!nfqa[NFQA_VERDICT_HDR])
682 return NULL;
683
684 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
685 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
686 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
687 return NULL;
688 return vhdr;
689 }
690
691 static int nfq_id_after(unsigned int id, unsigned int max)
692 {
693 return (int)(id - max) > 0;
694 }
695
696 static int
697 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
698 const struct nlmsghdr *nlh,
699 const struct nlattr * const nfqa[])
700 {
701 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
702 struct nf_queue_entry *entry, *tmp;
703 unsigned int verdict, maxid;
704 struct nfqnl_msg_verdict_hdr *vhdr;
705 struct nfqnl_instance *queue;
706 LIST_HEAD(batch_list);
707 u16 queue_num = ntohs(nfmsg->res_id);
708
709 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
710 if (IS_ERR(queue))
711 return PTR_ERR(queue);
712
713 vhdr = verdicthdr_get(nfqa);
714 if (!vhdr)
715 return -EINVAL;
716
717 verdict = ntohl(vhdr->verdict);
718 maxid = ntohl(vhdr->id);
719
720 spin_lock_bh(&queue->lock);
721
722 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
723 if (nfq_id_after(entry->id, maxid))
724 break;
725 __dequeue_entry(queue, entry);
726 list_add_tail(&entry->list, &batch_list);
727 }
728
729 spin_unlock_bh(&queue->lock);
730
731 if (list_empty(&batch_list))
732 return -ENOENT;
733
734 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
735 if (nfqa[NFQA_MARK])
736 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
737 nf_reinject(entry, verdict);
738 }
739 return 0;
740 }
741
742 static int
743 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
744 const struct nlmsghdr *nlh,
745 const struct nlattr * const nfqa[])
746 {
747 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
748 u_int16_t queue_num = ntohs(nfmsg->res_id);
749
750 struct nfqnl_msg_verdict_hdr *vhdr;
751 struct nfqnl_instance *queue;
752 unsigned int verdict;
753 struct nf_queue_entry *entry;
754 enum ip_conntrack_info uninitialized_var(ctinfo);
755 struct nf_conn *ct = NULL;
756
757 queue = instance_lookup(queue_num);
758 if (!queue)
759
760 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
761 if (IS_ERR(queue))
762 return PTR_ERR(queue);
763
764 vhdr = verdicthdr_get(nfqa);
765 if (!vhdr)
766 return -EINVAL;
767
768 verdict = ntohl(vhdr->verdict);
769
770 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
771 if (entry == NULL)
772 return -ENOENT;
773
774 rcu_read_lock();
775 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
776 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
777
778 if (nfqa[NFQA_PAYLOAD]) {
779 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
780 int diff = payload_len - entry->skb->len;
781
782 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
783 payload_len, entry, diff) < 0)
784 verdict = NF_DROP;
785
786 if (ct)
787 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
788 }
789 rcu_read_unlock();
790
791 if (nfqa[NFQA_MARK])
792 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
793
794 nf_reinject(entry, verdict);
795 return 0;
796 }
797
798 static int
799 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
800 const struct nlmsghdr *nlh,
801 const struct nlattr * const nfqa[])
802 {
803 return -ENOTSUPP;
804 }
805
806 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
807 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
808 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
809 };
810
811 static const struct nf_queue_handler nfqh = {
812 .outfn = &nfqnl_enqueue_packet,
813 };
814
815 static int
816 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
817 const struct nlmsghdr *nlh,
818 const struct nlattr * const nfqa[])
819 {
820 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
821 u_int16_t queue_num = ntohs(nfmsg->res_id);
822 struct nfqnl_instance *queue;
823 struct nfqnl_msg_config_cmd *cmd = NULL;
824 int ret = 0;
825
826 if (nfqa[NFQA_CFG_CMD]) {
827 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
828
829 /* Obsolete commands without queue context */
830 switch (cmd->command) {
831 case NFQNL_CFG_CMD_PF_BIND: return 0;
832 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
833 }
834 }
835
836 rcu_read_lock();
837 queue = instance_lookup(queue_num);
838 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
839 ret = -EPERM;
840 goto err_out_unlock;
841 }
842
843 if (cmd != NULL) {
844 switch (cmd->command) {
845 case NFQNL_CFG_CMD_BIND:
846 if (queue) {
847 ret = -EBUSY;
848 goto err_out_unlock;
849 }
850 queue = instance_create(queue_num, NETLINK_CB(skb).portid);
851 if (IS_ERR(queue)) {
852 ret = PTR_ERR(queue);
853 goto err_out_unlock;
854 }
855 break;
856 case NFQNL_CFG_CMD_UNBIND:
857 if (!queue) {
858 ret = -ENODEV;
859 goto err_out_unlock;
860 }
861 instance_destroy(queue);
862 break;
863 case NFQNL_CFG_CMD_PF_BIND:
864 case NFQNL_CFG_CMD_PF_UNBIND:
865 break;
866 default:
867 ret = -ENOTSUPP;
868 break;
869 }
870 }
871
872 if (nfqa[NFQA_CFG_PARAMS]) {
873 struct nfqnl_msg_config_params *params;
874
875 if (!queue) {
876 ret = -ENODEV;
877 goto err_out_unlock;
878 }
879 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
880 nfqnl_set_mode(queue, params->copy_mode,
881 ntohl(params->copy_range));
882 }
883
884 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
885 __be32 *queue_maxlen;
886
887 if (!queue) {
888 ret = -ENODEV;
889 goto err_out_unlock;
890 }
891 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
892 spin_lock_bh(&queue->lock);
893 queue->queue_maxlen = ntohl(*queue_maxlen);
894 spin_unlock_bh(&queue->lock);
895 }
896
897 if (nfqa[NFQA_CFG_FLAGS]) {
898 __u32 flags, mask;
899
900 if (!queue) {
901 ret = -ENODEV;
902 goto err_out_unlock;
903 }
904
905 if (!nfqa[NFQA_CFG_MASK]) {
906 /* A mask is needed to specify which flags are being
907 * changed.
908 */
909 ret = -EINVAL;
910 goto err_out_unlock;
911 }
912
913 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
914 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
915
916 if (flags >= NFQA_CFG_F_MAX) {
917 ret = -EOPNOTSUPP;
918 goto err_out_unlock;
919 }
920
921 spin_lock_bh(&queue->lock);
922 queue->flags &= ~mask;
923 queue->flags |= flags & mask;
924 spin_unlock_bh(&queue->lock);
925 }
926
927 err_out_unlock:
928 rcu_read_unlock();
929 return ret;
930 }
931
932 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
933 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
934 .attr_count = NFQA_MAX, },
935 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
936 .attr_count = NFQA_MAX,
937 .policy = nfqa_verdict_policy },
938 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
939 .attr_count = NFQA_CFG_MAX,
940 .policy = nfqa_cfg_policy },
941 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
942 .attr_count = NFQA_MAX,
943 .policy = nfqa_verdict_batch_policy },
944 };
945
946 static const struct nfnetlink_subsystem nfqnl_subsys = {
947 .name = "nf_queue",
948 .subsys_id = NFNL_SUBSYS_QUEUE,
949 .cb_count = NFQNL_MSG_MAX,
950 .cb = nfqnl_cb,
951 };
952
953 #ifdef CONFIG_PROC_FS
954 struct iter_state {
955 unsigned int bucket;
956 };
957
958 static struct hlist_node *get_first(struct seq_file *seq)
959 {
960 struct iter_state *st = seq->private;
961
962 if (!st)
963 return NULL;
964
965 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
966 if (!hlist_empty(&instance_table[st->bucket]))
967 return instance_table[st->bucket].first;
968 }
969 return NULL;
970 }
971
972 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
973 {
974 struct iter_state *st = seq->private;
975
976 h = h->next;
977 while (!h) {
978 if (++st->bucket >= INSTANCE_BUCKETS)
979 return NULL;
980
981 h = instance_table[st->bucket].first;
982 }
983 return h;
984 }
985
986 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
987 {
988 struct hlist_node *head;
989 head = get_first(seq);
990
991 if (head)
992 while (pos && (head = get_next(seq, head)))
993 pos--;
994 return pos ? NULL : head;
995 }
996
997 static void *seq_start(struct seq_file *seq, loff_t *pos)
998 __acquires(instances_lock)
999 {
1000 spin_lock(&instances_lock);
1001 return get_idx(seq, *pos);
1002 }
1003
1004 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1005 {
1006 (*pos)++;
1007 return get_next(s, v);
1008 }
1009
1010 static void seq_stop(struct seq_file *s, void *v)
1011 __releases(instances_lock)
1012 {
1013 spin_unlock(&instances_lock);
1014 }
1015
1016 static int seq_show(struct seq_file *s, void *v)
1017 {
1018 const struct nfqnl_instance *inst = v;
1019
1020 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1021 inst->queue_num,
1022 inst->peer_portid, inst->queue_total,
1023 inst->copy_mode, inst->copy_range,
1024 inst->queue_dropped, inst->queue_user_dropped,
1025 inst->id_sequence, 1);
1026 }
1027
1028 static const struct seq_operations nfqnl_seq_ops = {
1029 .start = seq_start,
1030 .next = seq_next,
1031 .stop = seq_stop,
1032 .show = seq_show,
1033 };
1034
1035 static int nfqnl_open(struct inode *inode, struct file *file)
1036 {
1037 return seq_open_private(file, &nfqnl_seq_ops,
1038 sizeof(struct iter_state));
1039 }
1040
1041 static const struct file_operations nfqnl_file_ops = {
1042 .owner = THIS_MODULE,
1043 .open = nfqnl_open,
1044 .read = seq_read,
1045 .llseek = seq_lseek,
1046 .release = seq_release_private,
1047 };
1048
1049 #endif /* PROC_FS */
1050
1051 static int __init nfnetlink_queue_init(void)
1052 {
1053 int i, status = -ENOMEM;
1054
1055 for (i = 0; i < INSTANCE_BUCKETS; i++)
1056 INIT_HLIST_HEAD(&instance_table[i]);
1057
1058 netlink_register_notifier(&nfqnl_rtnl_notifier);
1059 status = nfnetlink_subsys_register(&nfqnl_subsys);
1060 if (status < 0) {
1061 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
1062 goto cleanup_netlink_notifier;
1063 }
1064
1065 #ifdef CONFIG_PROC_FS
1066 if (!proc_create("nfnetlink_queue", 0440,
1067 proc_net_netfilter, &nfqnl_file_ops))
1068 goto cleanup_subsys;
1069 #endif
1070
1071 register_netdevice_notifier(&nfqnl_dev_notifier);
1072 nf_register_queue_handler(&nfqh);
1073 return status;
1074
1075 #ifdef CONFIG_PROC_FS
1076 cleanup_subsys:
1077 nfnetlink_subsys_unregister(&nfqnl_subsys);
1078 #endif
1079 cleanup_netlink_notifier:
1080 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1081 return status;
1082 }
1083
1084 static void __exit nfnetlink_queue_fini(void)
1085 {
1086 nf_unregister_queue_handler();
1087 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1088 #ifdef CONFIG_PROC_FS
1089 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
1090 #endif
1091 nfnetlink_subsys_unregister(&nfqnl_subsys);
1092 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1093
1094 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1095 }
1096
1097 MODULE_DESCRIPTION("netfilter packet queue handler");
1098 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1099 MODULE_LICENSE("GPL");
1100 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1101
1102 module_init(nfnetlink_queue_init);
1103 module_exit(nfnetlink_queue_fini);
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