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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / netfilter / nfnetlink_queue.c
blob12e1ab37fcd8f400151f8bced1b13a873b328e77
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
34 #include <asm/atomic.h>
35
36 #ifdef CONFIG_BRIDGE_NETFILTER
37 #include "../bridge/br_private.h"
38 #endif
39
40 #define NFQNL_QMAX_DEFAULT 1024
41
42 struct nfqnl_instance {
43 struct hlist_node hlist; /* global list of queues */
44 struct rcu_head rcu;
45
46 int peer_pid;
47 unsigned int queue_maxlen;
48 unsigned int copy_range;
49 unsigned int queue_total;
50 unsigned int queue_dropped;
51 unsigned int queue_user_dropped;
52
53 unsigned int id_sequence; /* 'sequence' of pkt ids */
54
55 u_int16_t queue_num; /* number of this queue */
56 u_int8_t copy_mode;
57
58 spinlock_t lock;
59
60 struct list_head queue_list; /* packets in queue */
61 };
62
63 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
64
65 static DEFINE_SPINLOCK(instances_lock);
66
67 #define INSTANCE_BUCKETS 16
68 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
69
70 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
71 {
72 return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
73 }
74
75 static struct nfqnl_instance *
76 instance_lookup(u_int16_t queue_num)
77 {
78 struct hlist_head *head;
79 struct hlist_node *pos;
80 struct nfqnl_instance *inst;
81
82 head = &instance_table[instance_hashfn(queue_num)];
83 hlist_for_each_entry_rcu(inst, pos, head, hlist) {
84 if (inst->queue_num == queue_num)
85 return inst;
86 }
87 return NULL;
88 }
89
90 static struct nfqnl_instance *
91 instance_create(u_int16_t queue_num, int pid)
92 {
93 struct nfqnl_instance *inst;
94 unsigned int h;
95 int err;
96
97 spin_lock(&instances_lock);
98 if (instance_lookup(queue_num)) {
99 err = -EEXIST;
100 goto out_unlock;
101 }
102
103 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
104 if (!inst) {
105 err = -ENOMEM;
106 goto out_unlock;
107 }
108
109 inst->queue_num = queue_num;
110 inst->peer_pid = pid;
111 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
112 inst->copy_range = 0xfffff;
113 inst->copy_mode = NFQNL_COPY_NONE;
114 spin_lock_init(&inst->lock);
115 INIT_LIST_HEAD(&inst->queue_list);
116
117 if (!try_module_get(THIS_MODULE)) {
118 err = -EAGAIN;
119 goto out_free;
120 }
121
122 h = instance_hashfn(queue_num);
123 hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
124
125 spin_unlock(&instances_lock);
126
127 return inst;
128
129 out_free:
130 kfree(inst);
131 out_unlock:
132 spin_unlock(&instances_lock);
133 return ERR_PTR(err);
134 }
135
136 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
137 unsigned long data);
138
139 static void
140 instance_destroy_rcu(struct rcu_head *head)
141 {
142 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
143 rcu);
144
145 nfqnl_flush(inst, NULL, 0);
146 kfree(inst);
147 module_put(THIS_MODULE);
148 }
149
150 static void
151 __instance_destroy(struct nfqnl_instance *inst)
152 {
153 hlist_del_rcu(&inst->hlist);
154 call_rcu(&inst->rcu, instance_destroy_rcu);
155 }
156
157 static void
158 instance_destroy(struct nfqnl_instance *inst)
159 {
160 spin_lock(&instances_lock);
161 __instance_destroy(inst);
162 spin_unlock(&instances_lock);
163 }
164
165 static inline void
166 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
167 {
168 list_add_tail(&entry->list, &queue->queue_list);
169 queue->queue_total++;
170 }
171
172 static struct nf_queue_entry *
173 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
174 {
175 struct nf_queue_entry *entry = NULL, *i;
176
177 spin_lock_bh(&queue->lock);
178
179 list_for_each_entry(i, &queue->queue_list, list) {
180 if (i->id == id) {
181 entry = i;
182 break;
183 }
184 }
185
186 if (entry) {
187 list_del(&entry->list);
188 queue->queue_total--;
189 }
190
191 spin_unlock_bh(&queue->lock);
192
193 return entry;
194 }
195
196 static void
197 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
198 {
199 struct nf_queue_entry *entry, *next;
200
201 spin_lock_bh(&queue->lock);
202 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
203 if (!cmpfn || cmpfn(entry, data)) {
204 list_del(&entry->list);
205 queue->queue_total--;
206 nf_reinject(entry, NF_DROP);
207 }
208 }
209 spin_unlock_bh(&queue->lock);
210 }
211
212 static struct sk_buff *
213 nfqnl_build_packet_message(struct nfqnl_instance *queue,
214 struct nf_queue_entry *entry)
215 {
216 sk_buff_data_t old_tail;
217 size_t size;
218 size_t data_len = 0;
219 struct sk_buff *skb;
220 struct nfqnl_msg_packet_hdr pmsg;
221 struct nlmsghdr *nlh;
222 struct nfgenmsg *nfmsg;
223 struct sk_buff *entskb = entry->skb;
224 struct net_device *indev;
225 struct net_device *outdev;
226
227 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
228 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
229 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
230 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
231 #ifdef CONFIG_BRIDGE_NETFILTER
232 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
233 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
234 #endif
235 + nla_total_size(sizeof(u_int32_t)) /* mark */
236 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
237 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
238
239 outdev = entry->outdev;
240
241 spin_lock_bh(&queue->lock);
242
243 switch ((enum nfqnl_config_mode)queue->copy_mode) {
244 case NFQNL_COPY_META:
245 case NFQNL_COPY_NONE:
246 break;
247
248 case NFQNL_COPY_PACKET:
249 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
250 skb_checksum_help(entskb)) {
251 spin_unlock_bh(&queue->lock);
252 return NULL;
253 }
254 if (queue->copy_range == 0
255 || queue->copy_range > entskb->len)
256 data_len = entskb->len;
257 else
258 data_len = queue->copy_range;
259
260 size += nla_total_size(data_len);
261 break;
262 }
263
264 entry->id = queue->id_sequence++;
265
266 spin_unlock_bh(&queue->lock);
267
268 skb = alloc_skb(size, GFP_ATOMIC);
269 if (!skb)
270 goto nlmsg_failure;
271
272 old_tail = skb->tail;
273 nlh = NLMSG_PUT(skb, 0, 0,
274 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
275 sizeof(struct nfgenmsg));
276 nfmsg = NLMSG_DATA(nlh);
277 nfmsg->nfgen_family = entry->pf;
278 nfmsg->version = NFNETLINK_V0;
279 nfmsg->res_id = htons(queue->queue_num);
280
281 pmsg.packet_id = htonl(entry->id);
282 pmsg.hw_protocol = entskb->protocol;
283 pmsg.hook = entry->hook;
284
285 NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg);
286
287 indev = entry->indev;
288 if (indev) {
289 #ifndef CONFIG_BRIDGE_NETFILTER
290 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex));
291 #else
292 if (entry->pf == PF_BRIDGE) {
293 /* Case 1: indev is physical input device, we need to
294 * look for bridge group (when called from
295 * netfilter_bridge) */
296 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
297 htonl(indev->ifindex));
298 /* this is the bridge group "brX" */
299 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
300 htonl(indev->br_port->br->dev->ifindex));
301 } else {
302 /* Case 2: indev is bridge group, we need to look for
303 * physical device (when called from ipv4) */
304 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
305 htonl(indev->ifindex));
306 if (entskb->nf_bridge && entskb->nf_bridge->physindev)
307 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
308 htonl(entskb->nf_bridge->physindev->ifindex));
309 }
310 #endif
311 }
312
313 if (outdev) {
314 #ifndef CONFIG_BRIDGE_NETFILTER
315 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex));
316 #else
317 if (entry->pf == PF_BRIDGE) {
318 /* Case 1: outdev is physical output device, we need to
319 * look for bridge group (when called from
320 * netfilter_bridge) */
321 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
322 htonl(outdev->ifindex));
323 /* this is the bridge group "brX" */
324 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
325 htonl(outdev->br_port->br->dev->ifindex));
326 } else {
327 /* Case 2: outdev is bridge group, we need to look for
328 * physical output device (when called from ipv4) */
329 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
330 htonl(outdev->ifindex));
331 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev)
332 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
333 htonl(entskb->nf_bridge->physoutdev->ifindex));
334 }
335 #endif
336 }
337
338 if (entskb->mark)
339 NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
340
341 if (indev && entskb->dev) {
342 struct nfqnl_msg_packet_hw phw;
343 int len = dev_parse_header(entskb, phw.hw_addr);
344 if (len) {
345 phw.hw_addrlen = htons(len);
346 NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
347 }
348 }
349
350 if (entskb->tstamp.tv64) {
351 struct nfqnl_msg_packet_timestamp ts;
352 struct timeval tv = ktime_to_timeval(entskb->tstamp);
353 ts.sec = cpu_to_be64(tv.tv_sec);
354 ts.usec = cpu_to_be64(tv.tv_usec);
355
356 NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
357 }
358
359 if (data_len) {
360 struct nlattr *nla;
361 int sz = nla_attr_size(data_len);
362
363 if (skb_tailroom(skb) < nla_total_size(data_len)) {
364 printk(KERN_WARNING "nf_queue: no tailroom!\n");
365 goto nlmsg_failure;
366 }
367
368 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
369 nla->nla_type = NFQA_PAYLOAD;
370 nla->nla_len = sz;
371
372 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
373 BUG();
374 }
375
376 nlh->nlmsg_len = skb->tail - old_tail;
377 return skb;
378
379 nlmsg_failure:
380 nla_put_failure:
381 if (skb)
382 kfree_skb(skb);
383 if (net_ratelimit())
384 printk(KERN_ERR "nf_queue: error creating packet message\n");
385 return NULL;
386 }
387
388 static int
389 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
390 {
391 struct sk_buff *nskb;
392 struct nfqnl_instance *queue;
393 int err;
394
395 /* rcu_read_lock()ed by nf_hook_slow() */
396 queue = instance_lookup(queuenum);
397 if (!queue)
398 goto err_out;
399
400 if (queue->copy_mode == NFQNL_COPY_NONE)
401 goto err_out;
402
403 nskb = nfqnl_build_packet_message(queue, entry);
404 if (nskb == NULL)
405 goto err_out;
406
407 spin_lock_bh(&queue->lock);
408
409 if (!queue->peer_pid)
410 goto err_out_free_nskb;
411
412 if (queue->queue_total >= queue->queue_maxlen) {
413 queue->queue_dropped++;
414 if (net_ratelimit())
415 printk(KERN_WARNING "nf_queue: full at %d entries, "
416 "dropping packets(s).\n",
417 queue->queue_total);
418 goto err_out_free_nskb;
419 }
420
421 /* nfnetlink_unicast will either free the nskb or add it to a socket */
422 err = nfnetlink_unicast(nskb, &init_net, queue->peer_pid, MSG_DONTWAIT);
423 if (err < 0) {
424 queue->queue_user_dropped++;
425 goto err_out_unlock;
426 }
427
428 __enqueue_entry(queue, entry);
429
430 spin_unlock_bh(&queue->lock);
431 return 0;
432
433 err_out_free_nskb:
434 kfree_skb(nskb);
435 err_out_unlock:
436 spin_unlock_bh(&queue->lock);
437 err_out:
438 return -1;
439 }
440
441 static int
442 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e)
443 {
444 struct sk_buff *nskb;
445 int diff;
446
447 diff = data_len - e->skb->len;
448 if (diff < 0) {
449 if (pskb_trim(e->skb, data_len))
450 return -ENOMEM;
451 } else if (diff > 0) {
452 if (data_len > 0xFFFF)
453 return -EINVAL;
454 if (diff > skb_tailroom(e->skb)) {
455 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
456 diff, GFP_ATOMIC);
457 if (!nskb) {
458 printk(KERN_WARNING "nf_queue: OOM "
459 "in mangle, dropping packet\n");
460 return -ENOMEM;
461 }
462 kfree_skb(e->skb);
463 e->skb = nskb;
464 }
465 skb_put(e->skb, diff);
466 }
467 if (!skb_make_writable(e->skb, data_len))
468 return -ENOMEM;
469 skb_copy_to_linear_data(e->skb, data, data_len);
470 e->skb->ip_summed = CHECKSUM_NONE;
471 return 0;
472 }
473
474 static int
475 nfqnl_set_mode(struct nfqnl_instance *queue,
476 unsigned char mode, unsigned int range)
477 {
478 int status = 0;
479
480 spin_lock_bh(&queue->lock);
481 switch (mode) {
482 case NFQNL_COPY_NONE:
483 case NFQNL_COPY_META:
484 queue->copy_mode = mode;
485 queue->copy_range = 0;
486 break;
487
488 case NFQNL_COPY_PACKET:
489 queue->copy_mode = mode;
490 /* we're using struct nlattr which has 16bit nla_len */
491 if (range > 0xffff)
492 queue->copy_range = 0xffff;
493 else
494 queue->copy_range = range;
495 break;
496
497 default:
498 status = -EINVAL;
499
500 }
501 spin_unlock_bh(&queue->lock);
502
503 return status;
504 }
505
506 static int
507 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
508 {
509 if (entry->indev)
510 if (entry->indev->ifindex == ifindex)
511 return 1;
512 if (entry->outdev)
513 if (entry->outdev->ifindex == ifindex)
514 return 1;
515 #ifdef CONFIG_BRIDGE_NETFILTER
516 if (entry->skb->nf_bridge) {
517 if (entry->skb->nf_bridge->physindev &&
518 entry->skb->nf_bridge->physindev->ifindex == ifindex)
519 return 1;
520 if (entry->skb->nf_bridge->physoutdev &&
521 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
522 return 1;
523 }
524 #endif
525 return 0;
526 }
527
528 /* drop all packets with either indev or outdev == ifindex from all queue
529 * instances */
530 static void
531 nfqnl_dev_drop(int ifindex)
532 {
533 int i;
534
535 rcu_read_lock();
536
537 for (i = 0; i < INSTANCE_BUCKETS; i++) {
538 struct hlist_node *tmp;
539 struct nfqnl_instance *inst;
540 struct hlist_head *head = &instance_table[i];
541
542 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
543 nfqnl_flush(inst, dev_cmp, ifindex);
544 }
545
546 rcu_read_unlock();
547 }
548
549 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
550
551 static int
552 nfqnl_rcv_dev_event(struct notifier_block *this,
553 unsigned long event, void *ptr)
554 {
555 struct net_device *dev = ptr;
556
557 if (!net_eq(dev_net(dev), &init_net))
558 return NOTIFY_DONE;
559
560 /* Drop any packets associated with the downed device */
561 if (event == NETDEV_DOWN)
562 nfqnl_dev_drop(dev->ifindex);
563 return NOTIFY_DONE;
564 }
565
566 static struct notifier_block nfqnl_dev_notifier = {
567 .notifier_call = nfqnl_rcv_dev_event,
568 };
569
570 static int
571 nfqnl_rcv_nl_event(struct notifier_block *this,
572 unsigned long event, void *ptr)
573 {
574 struct netlink_notify *n = ptr;
575
576 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
577 int i;
578
579 /* destroy all instances for this pid */
580 spin_lock(&instances_lock);
581 for (i = 0; i < INSTANCE_BUCKETS; i++) {
582 struct hlist_node *tmp, *t2;
583 struct nfqnl_instance *inst;
584 struct hlist_head *head = &instance_table[i];
585
586 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
587 if ((n->net == &init_net) &&
588 (n->pid == inst->peer_pid))
589 __instance_destroy(inst);
590 }
591 }
592 spin_unlock(&instances_lock);
593 }
594 return NOTIFY_DONE;
595 }
596
597 static struct notifier_block nfqnl_rtnl_notifier = {
598 .notifier_call = nfqnl_rcv_nl_event,
599 };
600
601 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
602 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
603 [NFQA_MARK] = { .type = NLA_U32 },
604 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
605 };
606
607 static int
608 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
609 const struct nlmsghdr *nlh,
610 const struct nlattr * const nfqa[])
611 {
612 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
613 u_int16_t queue_num = ntohs(nfmsg->res_id);
614
615 struct nfqnl_msg_verdict_hdr *vhdr;
616 struct nfqnl_instance *queue;
617 unsigned int verdict;
618 struct nf_queue_entry *entry;
619 int err;
620
621 rcu_read_lock();
622 queue = instance_lookup(queue_num);
623 if (!queue) {
624 err = -ENODEV;
625 goto err_out_unlock;
626 }
627
628 if (queue->peer_pid != NETLINK_CB(skb).pid) {
629 err = -EPERM;
630 goto err_out_unlock;
631 }
632
633 if (!nfqa[NFQA_VERDICT_HDR]) {
634 err = -EINVAL;
635 goto err_out_unlock;
636 }
637
638 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
639 verdict = ntohl(vhdr->verdict);
640
641 if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) {
642 err = -EINVAL;
643 goto err_out_unlock;
644 }
645
646 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
647 if (entry == NULL) {
648 err = -ENOENT;
649 goto err_out_unlock;
650 }
651 rcu_read_unlock();
652
653 if (nfqa[NFQA_PAYLOAD]) {
654 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
655 nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0)
656 verdict = NF_DROP;
657 }
658
659 if (nfqa[NFQA_MARK])
660 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
661
662 nf_reinject(entry, verdict);
663 return 0;
664
665 err_out_unlock:
666 rcu_read_unlock();
667 return err;
668 }
669
670 static int
671 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
672 const struct nlmsghdr *nlh,
673 const struct nlattr * const nfqa[])
674 {
675 return -ENOTSUPP;
676 }
677
678 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
679 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
680 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
681 };
682
683 static const struct nf_queue_handler nfqh = {
684 .name = "nf_queue",
685 .outfn = &nfqnl_enqueue_packet,
686 };
687
688 static int
689 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
690 const struct nlmsghdr *nlh,
691 const struct nlattr * const nfqa[])
692 {
693 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
694 u_int16_t queue_num = ntohs(nfmsg->res_id);
695 struct nfqnl_instance *queue;
696 struct nfqnl_msg_config_cmd *cmd = NULL;
697 int ret = 0;
698
699 if (nfqa[NFQA_CFG_CMD]) {
700 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
701
702 /* Commands without queue context - might sleep */
703 switch (cmd->command) {
704 case NFQNL_CFG_CMD_PF_BIND:
705 return nf_register_queue_handler(ntohs(cmd->pf),
706 &nfqh);
707 case NFQNL_CFG_CMD_PF_UNBIND:
708 return nf_unregister_queue_handler(ntohs(cmd->pf),
709 &nfqh);
710 }
711 }
712
713 rcu_read_lock();
714 queue = instance_lookup(queue_num);
715 if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
716 ret = -EPERM;
717 goto err_out_unlock;
718 }
719
720 if (cmd != NULL) {
721 switch (cmd->command) {
722 case NFQNL_CFG_CMD_BIND:
723 if (queue) {
724 ret = -EBUSY;
725 goto err_out_unlock;
726 }
727 queue = instance_create(queue_num, NETLINK_CB(skb).pid);
728 if (IS_ERR(queue)) {
729 ret = PTR_ERR(queue);
730 goto err_out_unlock;
731 }
732 break;
733 case NFQNL_CFG_CMD_UNBIND:
734 if (!queue) {
735 ret = -ENODEV;
736 goto err_out_unlock;
737 }
738 instance_destroy(queue);
739 break;
740 case NFQNL_CFG_CMD_PF_BIND:
741 case NFQNL_CFG_CMD_PF_UNBIND:
742 break;
743 default:
744 ret = -ENOTSUPP;
745 break;
746 }
747 }
748
749 if (nfqa[NFQA_CFG_PARAMS]) {
750 struct nfqnl_msg_config_params *params;
751
752 if (!queue) {
753 ret = -ENODEV;
754 goto err_out_unlock;
755 }
756 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
757 nfqnl_set_mode(queue, params->copy_mode,
758 ntohl(params->copy_range));
759 }
760
761 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
762 __be32 *queue_maxlen;
763
764 if (!queue) {
765 ret = -ENODEV;
766 goto err_out_unlock;
767 }
768 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
769 spin_lock_bh(&queue->lock);
770 queue->queue_maxlen = ntohl(*queue_maxlen);
771 spin_unlock_bh(&queue->lock);
772 }
773
774 err_out_unlock:
775 rcu_read_unlock();
776 return ret;
777 }
778
779 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
780 [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp,
781 .attr_count = NFQA_MAX, },
782 [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict,
783 .attr_count = NFQA_MAX,
784 .policy = nfqa_verdict_policy },
785 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
786 .attr_count = NFQA_CFG_MAX,
787 .policy = nfqa_cfg_policy },
788 };
789
790 static const struct nfnetlink_subsystem nfqnl_subsys = {
791 .name = "nf_queue",
792 .subsys_id = NFNL_SUBSYS_QUEUE,
793 .cb_count = NFQNL_MSG_MAX,
794 .cb = nfqnl_cb,
795 };
796
797 #ifdef CONFIG_PROC_FS
798 struct iter_state {
799 unsigned int bucket;
800 };
801
802 static struct hlist_node *get_first(struct seq_file *seq)
803 {
804 struct iter_state *st = seq->private;
805
806 if (!st)
807 return NULL;
808
809 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
810 if (!hlist_empty(&instance_table[st->bucket]))
811 return instance_table[st->bucket].first;
812 }
813 return NULL;
814 }
815
816 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
817 {
818 struct iter_state *st = seq->private;
819
820 h = h->next;
821 while (!h) {
822 if (++st->bucket >= INSTANCE_BUCKETS)
823 return NULL;
824
825 h = instance_table[st->bucket].first;
826 }
827 return h;
828 }
829
830 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
831 {
832 struct hlist_node *head;
833 head = get_first(seq);
834
835 if (head)
836 while (pos && (head = get_next(seq, head)))
837 pos--;
838 return pos ? NULL : head;
839 }
840
841 static void *seq_start(struct seq_file *seq, loff_t *pos)
842 __acquires(instances_lock)
843 {
844 spin_lock(&instances_lock);
845 return get_idx(seq, *pos);
846 }
847
848 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
849 {
850 (*pos)++;
851 return get_next(s, v);
852 }
853
854 static void seq_stop(struct seq_file *s, void *v)
855 __releases(instances_lock)
856 {
857 spin_unlock(&instances_lock);
858 }
859
860 static int seq_show(struct seq_file *s, void *v)
861 {
862 const struct nfqnl_instance *inst = v;
863
864 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
865 inst->queue_num,
866 inst->peer_pid, inst->queue_total,
867 inst->copy_mode, inst->copy_range,
868 inst->queue_dropped, inst->queue_user_dropped,
869 inst->id_sequence, 1);
870 }
871
872 static const struct seq_operations nfqnl_seq_ops = {
873 .start = seq_start,
874 .next = seq_next,
875 .stop = seq_stop,
876 .show = seq_show,
877 };
878
879 static int nfqnl_open(struct inode *inode, struct file *file)
880 {
881 return seq_open_private(file, &nfqnl_seq_ops,
882 sizeof(struct iter_state));
883 }
884
885 static const struct file_operations nfqnl_file_ops = {
886 .owner = THIS_MODULE,
887 .open = nfqnl_open,
888 .read = seq_read,
889 .llseek = seq_lseek,
890 .release = seq_release_private,
891 };
892
893 #endif /* PROC_FS */
894
895 static int __init nfnetlink_queue_init(void)
896 {
897 int i, status = -ENOMEM;
898
899 for (i = 0; i < INSTANCE_BUCKETS; i++)
900 INIT_HLIST_HEAD(&instance_table[i]);
901
902 netlink_register_notifier(&nfqnl_rtnl_notifier);
903 status = nfnetlink_subsys_register(&nfqnl_subsys);
904 if (status < 0) {
905 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
906 goto cleanup_netlink_notifier;
907 }
908
909 #ifdef CONFIG_PROC_FS
910 if (!proc_create("nfnetlink_queue", 0440,
911 proc_net_netfilter, &nfqnl_file_ops))
912 goto cleanup_subsys;
913 #endif
914
915 register_netdevice_notifier(&nfqnl_dev_notifier);
916 return status;
917
918 #ifdef CONFIG_PROC_FS
919 cleanup_subsys:
920 nfnetlink_subsys_unregister(&nfqnl_subsys);
921 #endif
922 cleanup_netlink_notifier:
923 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
924 return status;
925 }
926
927 static void __exit nfnetlink_queue_fini(void)
928 {
929 nf_unregister_queue_handlers(&nfqh);
930 unregister_netdevice_notifier(&nfqnl_dev_notifier);
931 #ifdef CONFIG_PROC_FS
932 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
933 #endif
934 nfnetlink_subsys_unregister(&nfqnl_subsys);
935 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
936
937 rcu_barrier(); /* Wait for completion of call_rcu()'s */
938 }
939
940 MODULE_DESCRIPTION("netfilter packet queue handler");
941 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
942 MODULE_LICENSE("GPL");
943 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
944
945 module_init(nfnetlink_queue_init);
946 module_exit(nfnetlink_queue_fini);
linux-next