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WDEV, ath5k, don't return int from bool function
[linux-2.6/mini2440.git] / net / netfilter / nfnetlink_queue.c
blob0043d3a9f87eb5bbb477c96f64d99a60d6320e6a
1 /*
2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfetlink.
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/notifier.h>
22 #include <linux/netdevice.h>
23 #include <linux/netfilter.h>
24 #include <linux/proc_fs.h>
25 #include <linux/netfilter_ipv4.h>
26 #include <linux/netfilter_ipv6.h>
27 #include <linux/netfilter/nfnetlink.h>
28 #include <linux/netfilter/nfnetlink_queue.h>
29 #include <linux/list.h>
30 #include <net/sock.h>
31 #include <net/netfilter/nf_queue.h>
32
33 #include <asm/atomic.h>
34
35 #ifdef CONFIG_BRIDGE_NETFILTER
36 #include "../bridge/br_private.h"
37 #endif
38
39 #define NFQNL_QMAX_DEFAULT 1024
40
41 struct nfqnl_instance {
42 struct hlist_node hlist; /* global list of queues */
43 struct rcu_head rcu;
44
45 int peer_pid;
46 unsigned int queue_maxlen;
47 unsigned int copy_range;
48 unsigned int queue_total;
49 unsigned int queue_dropped;
50 unsigned int queue_user_dropped;
51
52 unsigned int id_sequence; /* 'sequence' of pkt ids */
53
54 u_int16_t queue_num; /* number of this queue */
55 u_int8_t copy_mode;
56
57 spinlock_t lock;
58
59 struct list_head queue_list; /* packets in queue */
60 };
61
62 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
63
64 static DEFINE_SPINLOCK(instances_lock);
65
66 #define INSTANCE_BUCKETS 16
67 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
68
69 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
70 {
71 return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
72 }
73
74 static struct nfqnl_instance *
75 instance_lookup(u_int16_t queue_num)
76 {
77 struct hlist_head *head;
78 struct hlist_node *pos;
79 struct nfqnl_instance *inst;
80
81 head = &instance_table[instance_hashfn(queue_num)];
82 hlist_for_each_entry_rcu(inst, pos, head, hlist) {
83 if (inst->queue_num == queue_num)
84 return inst;
85 }
86 return NULL;
87 }
88
89 static struct nfqnl_instance *
90 instance_create(u_int16_t queue_num, int pid)
91 {
92 struct nfqnl_instance *inst;
93 unsigned int h;
94 int err;
95
96 spin_lock(&instances_lock);
97 if (instance_lookup(queue_num)) {
98 err = -EEXIST;
99 goto out_unlock;
100 }
101
102 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
103 if (!inst) {
104 err = -ENOMEM;
105 goto out_unlock;
106 }
107
108 inst->queue_num = queue_num;
109 inst->peer_pid = pid;
110 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
111 inst->copy_range = 0xfffff;
112 inst->copy_mode = NFQNL_COPY_NONE;
113 spin_lock_init(&inst->lock);
114 INIT_LIST_HEAD(&inst->queue_list);
115 INIT_RCU_HEAD(&inst->rcu);
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_ALIGN(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 data_len = 0;
247 break;
248
249 case NFQNL_COPY_PACKET:
250 if ((entskb->ip_summed == CHECKSUM_PARTIAL ||
251 entskb->ip_summed == CHECKSUM_COMPLETE) &&
252 skb_checksum_help(entskb)) {
253 spin_unlock_bh(&queue->lock);
254 return NULL;
255 }
256 if (queue->copy_range == 0
257 || queue->copy_range > entskb->len)
258 data_len = entskb->len;
259 else
260 data_len = queue->copy_range;
261
262 size += nla_total_size(data_len);
263 break;
264 }
265
266 entry->id = queue->id_sequence++;
267
268 spin_unlock_bh(&queue->lock);
269
270 skb = alloc_skb(size, GFP_ATOMIC);
271 if (!skb)
272 goto nlmsg_failure;
273
274 old_tail = skb->tail;
275 nlh = NLMSG_PUT(skb, 0, 0,
276 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
277 sizeof(struct nfgenmsg));
278 nfmsg = NLMSG_DATA(nlh);
279 nfmsg->nfgen_family = entry->pf;
280 nfmsg->version = NFNETLINK_V0;
281 nfmsg->res_id = htons(queue->queue_num);
282
283 pmsg.packet_id = htonl(entry->id);
284 pmsg.hw_protocol = entskb->protocol;
285 pmsg.hook = entry->hook;
286
287 NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg);
288
289 indev = entry->indev;
290 if (indev) {
291 #ifndef CONFIG_BRIDGE_NETFILTER
292 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex));
293 #else
294 if (entry->pf == PF_BRIDGE) {
295 /* Case 1: indev is physical input device, we need to
296 * look for bridge group (when called from
297 * netfilter_bridge) */
298 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
299 htonl(indev->ifindex));
300 /* this is the bridge group "brX" */
301 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
302 htonl(indev->br_port->br->dev->ifindex));
303 } else {
304 /* Case 2: indev is bridge group, we need to look for
305 * physical device (when called from ipv4) */
306 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
307 htonl(indev->ifindex));
308 if (entskb->nf_bridge && entskb->nf_bridge->physindev)
309 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
310 htonl(entskb->nf_bridge->physindev->ifindex));
311 }
312 #endif
313 }
314
315 if (outdev) {
316 #ifndef CONFIG_BRIDGE_NETFILTER
317 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex));
318 #else
319 if (entry->pf == PF_BRIDGE) {
320 /* Case 1: outdev is physical output device, we need to
321 * look for bridge group (when called from
322 * netfilter_bridge) */
323 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
324 htonl(outdev->ifindex));
325 /* this is the bridge group "brX" */
326 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
327 htonl(outdev->br_port->br->dev->ifindex));
328 } else {
329 /* Case 2: outdev is bridge group, we need to look for
330 * physical output device (when called from ipv4) */
331 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
332 htonl(outdev->ifindex));
333 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev)
334 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
335 htonl(entskb->nf_bridge->physoutdev->ifindex));
336 }
337 #endif
338 }
339
340 if (entskb->mark)
341 NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
342
343 if (indev && entskb->dev) {
344 struct nfqnl_msg_packet_hw phw;
345 int len = dev_parse_header(entskb, phw.hw_addr);
346 if (len) {
347 phw.hw_addrlen = htons(len);
348 NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
349 }
350 }
351
352 if (entskb->tstamp.tv64) {
353 struct nfqnl_msg_packet_timestamp ts;
354 struct timeval tv = ktime_to_timeval(entskb->tstamp);
355 ts.sec = cpu_to_be64(tv.tv_sec);
356 ts.usec = cpu_to_be64(tv.tv_usec);
357
358 NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
359 }
360
361 if (data_len) {
362 struct nlattr *nla;
363 int sz = nla_attr_size(data_len);
364
365 if (skb_tailroom(skb) < nla_total_size(data_len)) {
366 printk(KERN_WARNING "nf_queue: no tailroom!\n");
367 goto nlmsg_failure;
368 }
369
370 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
371 nla->nla_type = NFQA_PAYLOAD;
372 nla->nla_len = sz;
373
374 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
375 BUG();
376 }
377
378 nlh->nlmsg_len = skb->tail - old_tail;
379 return skb;
380
381 nlmsg_failure:
382 nla_put_failure:
383 if (skb)
384 kfree_skb(skb);
385 if (net_ratelimit())
386 printk(KERN_ERR "nf_queue: error creating packet message\n");
387 return NULL;
388 }
389
390 static int
391 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
392 {
393 struct sk_buff *nskb;
394 struct nfqnl_instance *queue;
395 int err;
396
397 /* rcu_read_lock()ed by nf_hook_slow() */
398 queue = instance_lookup(queuenum);
399 if (!queue)
400 goto err_out;
401
402 if (queue->copy_mode == NFQNL_COPY_NONE)
403 goto err_out;
404
405 nskb = nfqnl_build_packet_message(queue, entry);
406 if (nskb == NULL)
407 goto err_out;
408
409 spin_lock_bh(&queue->lock);
410
411 if (!queue->peer_pid)
412 goto err_out_free_nskb;
413
414 if (queue->queue_total >= queue->queue_maxlen) {
415 queue->queue_dropped++;
416 if (net_ratelimit())
417 printk(KERN_WARNING "nf_queue: full at %d entries, "
418 "dropping packets(s). Dropped: %d\n",
419 queue->queue_total, queue->queue_dropped);
420 goto err_out_free_nskb;
421 }
422
423 /* nfnetlink_unicast will either free the nskb or add it to a socket */
424 err = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT);
425 if (err < 0) {
426 queue->queue_user_dropped++;
427 goto err_out_unlock;
428 }
429
430 __enqueue_entry(queue, entry);
431
432 spin_unlock_bh(&queue->lock);
433 return 0;
434
435 err_out_free_nskb:
436 kfree_skb(nskb);
437 err_out_unlock:
438 spin_unlock_bh(&queue->lock);
439 err_out:
440 return -1;
441 }
442
443 static int
444 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e)
445 {
446 struct sk_buff *nskb;
447 int diff;
448
449 diff = data_len - e->skb->len;
450 if (diff < 0) {
451 if (pskb_trim(e->skb, data_len))
452 return -ENOMEM;
453 } else if (diff > 0) {
454 if (data_len > 0xFFFF)
455 return -EINVAL;
456 if (diff > skb_tailroom(e->skb)) {
457 nskb = skb_copy_expand(e->skb, 0,
458 diff - skb_tailroom(e->skb),
459 GFP_ATOMIC);
460 if (!nskb) {
461 printk(KERN_WARNING "nf_queue: OOM "
462 "in mangle, dropping packet\n");
463 return -ENOMEM;
464 }
465 kfree_skb(e->skb);
466 e->skb = nskb;
467 }
468 skb_put(e->skb, diff);
469 }
470 if (!skb_make_writable(e->skb, data_len))
471 return -ENOMEM;
472 skb_copy_to_linear_data(e->skb, data, data_len);
473 e->skb->ip_summed = CHECKSUM_NONE;
474 return 0;
475 }
476
477 static int
478 nfqnl_set_mode(struct nfqnl_instance *queue,
479 unsigned char mode, unsigned int range)
480 {
481 int status = 0;
482
483 spin_lock_bh(&queue->lock);
484 switch (mode) {
485 case NFQNL_COPY_NONE:
486 case NFQNL_COPY_META:
487 queue->copy_mode = mode;
488 queue->copy_range = 0;
489 break;
490
491 case NFQNL_COPY_PACKET:
492 queue->copy_mode = mode;
493 /* we're using struct nlattr which has 16bit nla_len */
494 if (range > 0xffff)
495 queue->copy_range = 0xffff;
496 else
497 queue->copy_range = range;
498 break;
499
500 default:
501 status = -EINVAL;
502
503 }
504 spin_unlock_bh(&queue->lock);
505
506 return status;
507 }
508
509 static int
510 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
511 {
512 if (entry->indev)
513 if (entry->indev->ifindex == ifindex)
514 return 1;
515 if (entry->outdev)
516 if (entry->outdev->ifindex == ifindex)
517 return 1;
518 #ifdef CONFIG_BRIDGE_NETFILTER
519 if (entry->skb->nf_bridge) {
520 if (entry->skb->nf_bridge->physindev &&
521 entry->skb->nf_bridge->physindev->ifindex == ifindex)
522 return 1;
523 if (entry->skb->nf_bridge->physoutdev &&
524 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
525 return 1;
526 }
527 #endif
528 return 0;
529 }
530
531 /* drop all packets with either indev or outdev == ifindex from all queue
532 * instances */
533 static void
534 nfqnl_dev_drop(int ifindex)
535 {
536 int i;
537
538 rcu_read_lock();
539
540 for (i = 0; i < INSTANCE_BUCKETS; i++) {
541 struct hlist_node *tmp;
542 struct nfqnl_instance *inst;
543 struct hlist_head *head = &instance_table[i];
544
545 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
546 nfqnl_flush(inst, dev_cmp, ifindex);
547 }
548
549 rcu_read_unlock();
550 }
551
552 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
553
554 static int
555 nfqnl_rcv_dev_event(struct notifier_block *this,
556 unsigned long event, void *ptr)
557 {
558 struct net_device *dev = ptr;
559
560 if (dev->nd_net != &init_net)
561 return NOTIFY_DONE;
562
563 /* Drop any packets associated with the downed device */
564 if (event == NETDEV_DOWN)
565 nfqnl_dev_drop(dev->ifindex);
566 return NOTIFY_DONE;
567 }
568
569 static struct notifier_block nfqnl_dev_notifier = {
570 .notifier_call = nfqnl_rcv_dev_event,
571 };
572
573 static int
574 nfqnl_rcv_nl_event(struct notifier_block *this,
575 unsigned long event, void *ptr)
576 {
577 struct netlink_notify *n = ptr;
578
579 if (event == NETLINK_URELEASE &&
580 n->protocol == NETLINK_NETFILTER && n->pid) {
581 int i;
582
583 /* destroy all instances for this pid */
584 spin_lock(&instances_lock);
585 for (i = 0; i < INSTANCE_BUCKETS; i++) {
586 struct hlist_node *tmp, *t2;
587 struct nfqnl_instance *inst;
588 struct hlist_head *head = &instance_table[i];
589
590 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
591 if ((n->net == &init_net) &&
592 (n->pid == inst->peer_pid))
593 __instance_destroy(inst);
594 }
595 }
596 spin_unlock(&instances_lock);
597 }
598 return NOTIFY_DONE;
599 }
600
601 static struct notifier_block nfqnl_rtnl_notifier = {
602 .notifier_call = nfqnl_rcv_nl_event,
603 };
604
605 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
606 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
607 [NFQA_MARK] = { .type = NLA_U32 },
608 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
609 };
610
611 static int
612 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
613 struct nlmsghdr *nlh, struct nlattr *nfqa[])
614 {
615 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
616 u_int16_t queue_num = ntohs(nfmsg->res_id);
617
618 struct nfqnl_msg_verdict_hdr *vhdr;
619 struct nfqnl_instance *queue;
620 unsigned int verdict;
621 struct nf_queue_entry *entry;
622 int err;
623
624 rcu_read_lock();
625 queue = instance_lookup(queue_num);
626 if (!queue) {
627 err = -ENODEV;
628 goto err_out_unlock;
629 }
630
631 if (queue->peer_pid != NETLINK_CB(skb).pid) {
632 err = -EPERM;
633 goto err_out_unlock;
634 }
635
636 if (!nfqa[NFQA_VERDICT_HDR]) {
637 err = -EINVAL;
638 goto err_out_unlock;
639 }
640
641 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
642 verdict = ntohl(vhdr->verdict);
643
644 if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) {
645 err = -EINVAL;
646 goto err_out_unlock;
647 }
648
649 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
650 if (entry == NULL) {
651 err = -ENOENT;
652 goto err_out_unlock;
653 }
654 rcu_read_unlock();
655
656 if (nfqa[NFQA_PAYLOAD]) {
657 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
658 nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0)
659 verdict = NF_DROP;
660 }
661
662 if (nfqa[NFQA_MARK])
663 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
664
665 nf_reinject(entry, verdict);
666 return 0;
667
668 err_out_unlock:
669 rcu_read_unlock();
670 return err;
671 }
672
673 static int
674 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
675 struct nlmsghdr *nlh, struct nlattr *nfqa[])
676 {
677 return -ENOTSUPP;
678 }
679
680 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
681 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
682 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
683 };
684
685 static const struct nf_queue_handler nfqh = {
686 .name = "nf_queue",
687 .outfn = &nfqnl_enqueue_packet,
688 };
689
690 static int
691 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
692 struct nlmsghdr *nlh, struct nlattr *nfqa[])
693 {
694 struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
695 u_int16_t queue_num = ntohs(nfmsg->res_id);
696 struct nfqnl_instance *queue;
697 struct nfqnl_msg_config_cmd *cmd = NULL;
698 int ret = 0;
699
700 if (nfqa[NFQA_CFG_CMD]) {
701 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
702
703 /* Commands without queue context - might sleep */
704 switch (cmd->command) {
705 case NFQNL_CFG_CMD_PF_BIND:
706 ret = nf_register_queue_handler(ntohs(cmd->pf),
707 &nfqh);
708 break;
709 case NFQNL_CFG_CMD_PF_UNBIND:
710 ret = nf_unregister_queue_handler(ntohs(cmd->pf),
711 &nfqh);
712 break;
713 default:
714 break;
715 }
716
717 if (ret < 0)
718 return ret;
719 }
720
721 rcu_read_lock();
722 queue = instance_lookup(queue_num);
723 if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
724 ret = -EPERM;
725 goto err_out_unlock;
726 }
727
728 if (cmd != NULL) {
729 switch (cmd->command) {
730 case NFQNL_CFG_CMD_BIND:
731 if (queue) {
732 ret = -EBUSY;
733 goto err_out_unlock;
734 }
735 queue = instance_create(queue_num, NETLINK_CB(skb).pid);
736 if (IS_ERR(queue)) {
737 ret = PTR_ERR(queue);
738 goto err_out_unlock;
739 }
740 break;
741 case NFQNL_CFG_CMD_UNBIND:
742 if (!queue) {
743 ret = -ENODEV;
744 goto err_out_unlock;
745 }
746 instance_destroy(queue);
747 break;
748 case NFQNL_CFG_CMD_PF_BIND:
749 case NFQNL_CFG_CMD_PF_UNBIND:
750 break;
751 default:
752 ret = -ENOTSUPP;
753 break;
754 }
755 }
756
757 if (nfqa[NFQA_CFG_PARAMS]) {
758 struct nfqnl_msg_config_params *params;
759
760 if (!queue) {
761 ret = -ENODEV;
762 goto err_out_unlock;
763 }
764 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
765 nfqnl_set_mode(queue, params->copy_mode,
766 ntohl(params->copy_range));
767 }
768
769 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
770 __be32 *queue_maxlen;
771
772 if (!queue) {
773 ret = -ENODEV;
774 goto err_out_unlock;
775 }
776 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
777 spin_lock_bh(&queue->lock);
778 queue->queue_maxlen = ntohl(*queue_maxlen);
779 spin_unlock_bh(&queue->lock);
780 }
781
782 err_out_unlock:
783 rcu_read_unlock();
784 return ret;
785 }
786
787 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
788 [NFQNL_MSG_PACKET] = { .call = nfqnl_recv_unsupp,
789 .attr_count = NFQA_MAX, },
790 [NFQNL_MSG_VERDICT] = { .call = nfqnl_recv_verdict,
791 .attr_count = NFQA_MAX,
792 .policy = nfqa_verdict_policy },
793 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
794 .attr_count = NFQA_CFG_MAX,
795 .policy = nfqa_cfg_policy },
796 };
797
798 static const struct nfnetlink_subsystem nfqnl_subsys = {
799 .name = "nf_queue",
800 .subsys_id = NFNL_SUBSYS_QUEUE,
801 .cb_count = NFQNL_MSG_MAX,
802 .cb = nfqnl_cb,
803 };
804
805 #ifdef CONFIG_PROC_FS
806 struct iter_state {
807 unsigned int bucket;
808 };
809
810 static struct hlist_node *get_first(struct seq_file *seq)
811 {
812 struct iter_state *st = seq->private;
813
814 if (!st)
815 return NULL;
816
817 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
818 if (!hlist_empty(&instance_table[st->bucket]))
819 return instance_table[st->bucket].first;
820 }
821 return NULL;
822 }
823
824 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
825 {
826 struct iter_state *st = seq->private;
827
828 h = h->next;
829 while (!h) {
830 if (++st->bucket >= INSTANCE_BUCKETS)
831 return NULL;
832
833 h = instance_table[st->bucket].first;
834 }
835 return h;
836 }
837
838 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
839 {
840 struct hlist_node *head;
841 head = get_first(seq);
842
843 if (head)
844 while (pos && (head = get_next(seq, head)))
845 pos--;
846 return pos ? NULL : head;
847 }
848
849 static void *seq_start(struct seq_file *seq, loff_t *pos)
850 __acquires(instances_lock)
851 {
852 spin_lock(&instances_lock);
853 return get_idx(seq, *pos);
854 }
855
856 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
857 {
858 (*pos)++;
859 return get_next(s, v);
860 }
861
862 static void seq_stop(struct seq_file *s, void *v)
863 __releases(instances_lock)
864 {
865 spin_unlock(&instances_lock);
866 }
867
868 static int seq_show(struct seq_file *s, void *v)
869 {
870 const struct nfqnl_instance *inst = v;
871
872 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
873 inst->queue_num,
874 inst->peer_pid, inst->queue_total,
875 inst->copy_mode, inst->copy_range,
876 inst->queue_dropped, inst->queue_user_dropped,
877 inst->id_sequence, 1);
878 }
879
880 static const struct seq_operations nfqnl_seq_ops = {
881 .start = seq_start,
882 .next = seq_next,
883 .stop = seq_stop,
884 .show = seq_show,
885 };
886
887 static int nfqnl_open(struct inode *inode, struct file *file)
888 {
889 return seq_open_private(file, &nfqnl_seq_ops,
890 sizeof(struct iter_state));
891 }
892
893 static const struct file_operations nfqnl_file_ops = {
894 .owner = THIS_MODULE,
895 .open = nfqnl_open,
896 .read = seq_read,
897 .llseek = seq_lseek,
898 .release = seq_release_private,
899 };
900
901 #endif /* PROC_FS */
902
903 static int __init nfnetlink_queue_init(void)
904 {
905 int i, status = -ENOMEM;
906 #ifdef CONFIG_PROC_FS
907 struct proc_dir_entry *proc_nfqueue;
908 #endif
909
910 for (i = 0; i < INSTANCE_BUCKETS; i++)
911 INIT_HLIST_HEAD(&instance_table[i]);
912
913 netlink_register_notifier(&nfqnl_rtnl_notifier);
914 status = nfnetlink_subsys_register(&nfqnl_subsys);
915 if (status < 0) {
916 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
917 goto cleanup_netlink_notifier;
918 }
919
920 #ifdef CONFIG_PROC_FS
921 proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440,
922 proc_net_netfilter);
923 if (!proc_nfqueue)
924 goto cleanup_subsys;
925 proc_nfqueue->proc_fops = &nfqnl_file_ops;
926 #endif
927
928 register_netdevice_notifier(&nfqnl_dev_notifier);
929 return status;
930
931 #ifdef CONFIG_PROC_FS
932 cleanup_subsys:
933 nfnetlink_subsys_unregister(&nfqnl_subsys);
934 #endif
935 cleanup_netlink_notifier:
936 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
937 return status;
938 }
939
940 static void __exit nfnetlink_queue_fini(void)
941 {
942 nf_unregister_queue_handlers(&nfqh);
943 unregister_netdevice_notifier(&nfqnl_dev_notifier);
944 #ifdef CONFIG_PROC_FS
945 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
946 #endif
947 nfnetlink_subsys_unregister(&nfqnl_subsys);
948 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
949 }
950
951 MODULE_DESCRIPTION("netfilter packet queue handler");
952 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
953 MODULE_LICENSE("GPL");
954 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
955
956 module_init(nfnetlink_queue_init);
957 module_exit(nfnetlink_queue_fini);
Support for the Chinese Samsung S3C2440 based development boards