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netlink: Rename pid to portid to avoid confusion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nfnetlink_queue_core.c
1 /*
2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
4 *
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
7 *
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17 #include <linux/module.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/proc_fs.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter/nfnetlink.h>
29 #include <linux/netfilter/nfnetlink_queue.h>
30 #include <linux/list.h>
31 #include <net/sock.h>
32 #include <net/netfilter/nf_queue.h>
33 #include <net/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;
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
252 outdev = entry->outdev;
253
254 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
255 case NFQNL_COPY_META:
256 case NFQNL_COPY_NONE:
257 break;
258
259 case NFQNL_COPY_PACKET:
260 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
261 skb_checksum_help(entskb))
262 return NULL;
263
264 data_len = ACCESS_ONCE(queue->copy_range);
265 if (data_len == 0 || data_len > entskb->len)
266 data_len = entskb->len;
267
268 size += nla_total_size(data_len);
269 break;
270 }
271
272 if (queue->flags & NFQA_CFG_F_CONNTRACK)
273 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
274
275 skb = alloc_skb(size, GFP_ATOMIC);
276 if (!skb)
277 return NULL;
278
279 old_tail = skb->tail;
280 nlh = nlmsg_put(skb, 0, 0,
281 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
282 sizeof(struct nfgenmsg), 0);
283 if (!nlh) {
284 kfree_skb(skb);
285 return NULL;
286 }
287 nfmsg = nlmsg_data(nlh);
288 nfmsg->nfgen_family = entry->pf;
289 nfmsg->version = NFNETLINK_V0;
290 nfmsg->res_id = htons(queue->queue_num);
291
292 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
293 pmsg = nla_data(nla);
294 pmsg->hw_protocol = entskb->protocol;
295 pmsg->hook = entry->hook;
296 *packet_id_ptr = &pmsg->packet_id;
297
298 indev = entry->indev;
299 if (indev) {
300 #ifndef CONFIG_BRIDGE_NETFILTER
301 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
302 goto nla_put_failure;
303 #else
304 if (entry->pf == PF_BRIDGE) {
305 /* Case 1: indev is physical input device, we need to
306 * look for bridge group (when called from
307 * netfilter_bridge) */
308 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
309 htonl(indev->ifindex)) ||
310 /* this is the bridge group "brX" */
311 /* rcu_read_lock()ed by __nf_queue */
312 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
313 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
314 goto nla_put_failure;
315 } else {
316 /* Case 2: indev is bridge group, we need to look for
317 * physical device (when called from ipv4) */
318 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
319 htonl(indev->ifindex)))
320 goto nla_put_failure;
321 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
322 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
323 htonl(entskb->nf_bridge->physindev->ifindex)))
324 goto nla_put_failure;
325 }
326 #endif
327 }
328
329 if (outdev) {
330 #ifndef CONFIG_BRIDGE_NETFILTER
331 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
332 goto nla_put_failure;
333 #else
334 if (entry->pf == PF_BRIDGE) {
335 /* Case 1: outdev is physical output device, we need to
336 * look for bridge group (when called from
337 * netfilter_bridge) */
338 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
339 htonl(outdev->ifindex)) ||
340 /* this is the bridge group "brX" */
341 /* rcu_read_lock()ed by __nf_queue */
342 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
343 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
344 goto nla_put_failure;
345 } else {
346 /* Case 2: outdev is bridge group, we need to look for
347 * physical output device (when called from ipv4) */
348 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
349 htonl(outdev->ifindex)))
350 goto nla_put_failure;
351 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
352 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
353 htonl(entskb->nf_bridge->physoutdev->ifindex)))
354 goto nla_put_failure;
355 }
356 #endif
357 }
358
359 if (entskb->mark &&
360 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
361 goto nla_put_failure;
362
363 if (indev && entskb->dev &&
364 entskb->mac_header != entskb->network_header) {
365 struct nfqnl_msg_packet_hw phw;
366 int len = dev_parse_header(entskb, phw.hw_addr);
367 if (len) {
368 phw.hw_addrlen = htons(len);
369 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
370 goto nla_put_failure;
371 }
372 }
373
374 if (entskb->tstamp.tv64) {
375 struct nfqnl_msg_packet_timestamp ts;
376 struct timeval tv = ktime_to_timeval(entskb->tstamp);
377 ts.sec = cpu_to_be64(tv.tv_sec);
378 ts.usec = cpu_to_be64(tv.tv_usec);
379
380 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
381 goto nla_put_failure;
382 }
383
384 if (data_len) {
385 struct nlattr *nla;
386 int sz = nla_attr_size(data_len);
387
388 if (skb_tailroom(skb) < nla_total_size(data_len)) {
389 printk(KERN_WARNING "nf_queue: no tailroom!\n");
390 kfree_skb(skb);
391 return NULL;
392 }
393
394 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
395 nla->nla_type = NFQA_PAYLOAD;
396 nla->nla_len = sz;
397
398 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
399 BUG();
400 }
401
402 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
403 goto nla_put_failure;
404
405 nlh->nlmsg_len = skb->tail - old_tail;
406 return skb;
407
408 nla_put_failure:
409 if (skb)
410 kfree_skb(skb);
411 net_err_ratelimited("nf_queue: error creating packet message\n");
412 return NULL;
413 }
414
415 static int
416 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
417 {
418 struct sk_buff *nskb;
419 struct nfqnl_instance *queue;
420 int err = -ENOBUFS;
421 __be32 *packet_id_ptr;
422 int failopen = 0;
423
424 /* rcu_read_lock()ed by nf_hook_slow() */
425 queue = instance_lookup(queuenum);
426 if (!queue) {
427 err = -ESRCH;
428 goto err_out;
429 }
430
431 if (queue->copy_mode == NFQNL_COPY_NONE) {
432 err = -EINVAL;
433 goto err_out;
434 }
435
436 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
437 if (nskb == NULL) {
438 err = -ENOMEM;
439 goto err_out;
440 }
441 spin_lock_bh(&queue->lock);
442
443 if (!queue->peer_portid) {
444 err = -EINVAL;
445 goto err_out_free_nskb;
446 }
447 if (queue->queue_total >= queue->queue_maxlen) {
448 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
449 failopen = 1;
450 err = 0;
451 } else {
452 queue->queue_dropped++;
453 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
454 queue->queue_total);
455 }
456 goto err_out_free_nskb;
457 }
458 entry->id = ++queue->id_sequence;
459 *packet_id_ptr = htonl(entry->id);
460
461 /* nfnetlink_unicast will either free the nskb or add it to a socket */
462 err = nfnetlink_unicast(nskb, &init_net, queue->peer_portid, MSG_DONTWAIT);
463 if (err < 0) {
464 queue->queue_user_dropped++;
465 goto err_out_unlock;
466 }
467
468 __enqueue_entry(queue, entry);
469
470 spin_unlock_bh(&queue->lock);
471 return 0;
472
473 err_out_free_nskb:
474 kfree_skb(nskb);
475 err_out_unlock:
476 spin_unlock_bh(&queue->lock);
477 if (failopen)
478 nf_reinject(entry, NF_ACCEPT);
479 err_out:
480 return err;
481 }
482
483 static int
484 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
485 {
486 struct sk_buff *nskb;
487
488 if (diff < 0) {
489 if (pskb_trim(e->skb, data_len))
490 return -ENOMEM;
491 } else if (diff > 0) {
492 if (data_len > 0xFFFF)
493 return -EINVAL;
494 if (diff > skb_tailroom(e->skb)) {
495 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
496 diff, GFP_ATOMIC);
497 if (!nskb) {
498 printk(KERN_WARNING "nf_queue: OOM "
499 "in mangle, dropping packet\n");
500 return -ENOMEM;
501 }
502 kfree_skb(e->skb);
503 e->skb = nskb;
504 }
505 skb_put(e->skb, diff);
506 }
507 if (!skb_make_writable(e->skb, data_len))
508 return -ENOMEM;
509 skb_copy_to_linear_data(e->skb, data, data_len);
510 e->skb->ip_summed = CHECKSUM_NONE;
511 return 0;
512 }
513
514 static int
515 nfqnl_set_mode(struct nfqnl_instance *queue,
516 unsigned char mode, unsigned int range)
517 {
518 int status = 0;
519
520 spin_lock_bh(&queue->lock);
521 switch (mode) {
522 case NFQNL_COPY_NONE:
523 case NFQNL_COPY_META:
524 queue->copy_mode = mode;
525 queue->copy_range = 0;
526 break;
527
528 case NFQNL_COPY_PACKET:
529 queue->copy_mode = mode;
530 /* we're using struct nlattr which has 16bit nla_len */
531 if (range > 0xffff)
532 queue->copy_range = 0xffff;
533 else
534 queue->copy_range = range;
535 break;
536
537 default:
538 status = -EINVAL;
539
540 }
541 spin_unlock_bh(&queue->lock);
542
543 return status;
544 }
545
546 static int
547 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
548 {
549 if (entry->indev)
550 if (entry->indev->ifindex == ifindex)
551 return 1;
552 if (entry->outdev)
553 if (entry->outdev->ifindex == ifindex)
554 return 1;
555 #ifdef CONFIG_BRIDGE_NETFILTER
556 if (entry->skb->nf_bridge) {
557 if (entry->skb->nf_bridge->physindev &&
558 entry->skb->nf_bridge->physindev->ifindex == ifindex)
559 return 1;
560 if (entry->skb->nf_bridge->physoutdev &&
561 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
562 return 1;
563 }
564 #endif
565 return 0;
566 }
567
568 /* drop all packets with either indev or outdev == ifindex from all queue
569 * instances */
570 static void
571 nfqnl_dev_drop(int ifindex)
572 {
573 int i;
574
575 rcu_read_lock();
576
577 for (i = 0; i < INSTANCE_BUCKETS; i++) {
578 struct hlist_node *tmp;
579 struct nfqnl_instance *inst;
580 struct hlist_head *head = &instance_table[i];
581
582 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
583 nfqnl_flush(inst, dev_cmp, ifindex);
584 }
585
586 rcu_read_unlock();
587 }
588
589 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
590
591 static int
592 nfqnl_rcv_dev_event(struct notifier_block *this,
593 unsigned long event, void *ptr)
594 {
595 struct net_device *dev = ptr;
596
597 if (!net_eq(dev_net(dev), &init_net))
598 return NOTIFY_DONE;
599
600 /* Drop any packets associated with the downed device */
601 if (event == NETDEV_DOWN)
602 nfqnl_dev_drop(dev->ifindex);
603 return NOTIFY_DONE;
604 }
605
606 static struct notifier_block nfqnl_dev_notifier = {
607 .notifier_call = nfqnl_rcv_dev_event,
608 };
609
610 static int
611 nfqnl_rcv_nl_event(struct notifier_block *this,
612 unsigned long event, void *ptr)
613 {
614 struct netlink_notify *n = ptr;
615
616 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
617 int i;
618
619 /* destroy all instances for this portid */
620 spin_lock(&instances_lock);
621 for (i = 0; i < INSTANCE_BUCKETS; i++) {
622 struct hlist_node *tmp, *t2;
623 struct nfqnl_instance *inst;
624 struct hlist_head *head = &instance_table[i];
625
626 hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
627 if ((n->net == &init_net) &&
628 (n->portid == inst->peer_portid))
629 __instance_destroy(inst);
630 }
631 }
632 spin_unlock(&instances_lock);
633 }
634 return NOTIFY_DONE;
635 }
636
637 static struct notifier_block nfqnl_rtnl_notifier = {
638 .notifier_call = nfqnl_rcv_nl_event,
639 };
640
641 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
642 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
643 [NFQA_MARK] = { .type = NLA_U32 },
644 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
645 [NFQA_CT] = { .type = NLA_UNSPEC },
646 };
647
648 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
649 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
650 [NFQA_MARK] = { .type = NLA_U32 },
651 };
652
653 static struct nfqnl_instance *verdict_instance_lookup(u16 queue_num, int nlportid)
654 {
655 struct nfqnl_instance *queue;
656
657 queue = instance_lookup(queue_num);
658 if (!queue)
659 return ERR_PTR(-ENODEV);
660
661 if (queue->peer_portid != nlportid)
662 return ERR_PTR(-EPERM);
663
664 return queue;
665 }
666
667 static struct nfqnl_msg_verdict_hdr*
668 verdicthdr_get(const struct nlattr * const nfqa[])
669 {
670 struct nfqnl_msg_verdict_hdr *vhdr;
671 unsigned int verdict;
672
673 if (!nfqa[NFQA_VERDICT_HDR])
674 return NULL;
675
676 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
677 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
678 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
679 return NULL;
680 return vhdr;
681 }
682
683 static int nfq_id_after(unsigned int id, unsigned int max)
684 {
685 return (int)(id - max) > 0;
686 }
687
688 static int
689 nfqnl_recv_verdict_batch(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 struct nf_queue_entry *entry, *tmp;
695 unsigned int verdict, maxid;
696 struct nfqnl_msg_verdict_hdr *vhdr;
697 struct nfqnl_instance *queue;
698 LIST_HEAD(batch_list);
699 u16 queue_num = ntohs(nfmsg->res_id);
700
701 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
702 if (IS_ERR(queue))
703 return PTR_ERR(queue);
704
705 vhdr = verdicthdr_get(nfqa);
706 if (!vhdr)
707 return -EINVAL;
708
709 verdict = ntohl(vhdr->verdict);
710 maxid = ntohl(vhdr->id);
711
712 spin_lock_bh(&queue->lock);
713
714 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
715 if (nfq_id_after(entry->id, maxid))
716 break;
717 __dequeue_entry(queue, entry);
718 list_add_tail(&entry->list, &batch_list);
719 }
720
721 spin_unlock_bh(&queue->lock);
722
723 if (list_empty(&batch_list))
724 return -ENOENT;
725
726 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
727 if (nfqa[NFQA_MARK])
728 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
729 nf_reinject(entry, verdict);
730 }
731 return 0;
732 }
733
734 static int
735 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
736 const struct nlmsghdr *nlh,
737 const struct nlattr * const nfqa[])
738 {
739 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
740 u_int16_t queue_num = ntohs(nfmsg->res_id);
741
742 struct nfqnl_msg_verdict_hdr *vhdr;
743 struct nfqnl_instance *queue;
744 unsigned int verdict;
745 struct nf_queue_entry *entry;
746 enum ip_conntrack_info uninitialized_var(ctinfo);
747 struct nf_conn *ct = NULL;
748
749 queue = instance_lookup(queue_num);
750 if (!queue)
751
752 queue = verdict_instance_lookup(queue_num, NETLINK_CB(skb).portid);
753 if (IS_ERR(queue))
754 return PTR_ERR(queue);
755
756 vhdr = verdicthdr_get(nfqa);
757 if (!vhdr)
758 return -EINVAL;
759
760 verdict = ntohl(vhdr->verdict);
761
762 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
763 if (entry == NULL)
764 return -ENOENT;
765
766 rcu_read_lock();
767 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
768 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
769
770 if (nfqa[NFQA_PAYLOAD]) {
771 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
772 int diff = payload_len - entry->skb->len;
773
774 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
775 payload_len, entry, diff) < 0)
776 verdict = NF_DROP;
777
778 if (ct)
779 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
780 }
781 rcu_read_unlock();
782
783 if (nfqa[NFQA_MARK])
784 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
785
786 nf_reinject(entry, verdict);
787 return 0;
788 }
789
790 static int
791 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
792 const struct nlmsghdr *nlh,
793 const struct nlattr * const nfqa[])
794 {
795 return -ENOTSUPP;
796 }
797
798 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
799 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
800 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
801 };
802
803 static const struct nf_queue_handler nfqh = {
804 .name = "nf_queue",
805 .outfn = &nfqnl_enqueue_packet,
806 };
807
808 static int
809 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
810 const struct nlmsghdr *nlh,
811 const struct nlattr * const nfqa[])
812 {
813 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
814 u_int16_t queue_num = ntohs(nfmsg->res_id);
815 struct nfqnl_instance *queue;
816 struct nfqnl_msg_config_cmd *cmd = NULL;
817 int ret = 0;
818
819 if (nfqa[NFQA_CFG_CMD]) {
820 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
821
822 /* Commands without queue context - might sleep */
823 switch (cmd->command) {
824 case NFQNL_CFG_CMD_PF_BIND:
825 return nf_register_queue_handler(ntohs(cmd->pf),
826 &nfqh);
827 case NFQNL_CFG_CMD_PF_UNBIND:
828 return nf_unregister_queue_handler(ntohs(cmd->pf),
829 &nfqh);
830 }
831 }
832
833 rcu_read_lock();
834 queue = instance_lookup(queue_num);
835 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
836 ret = -EPERM;
837 goto err_out_unlock;
838 }
839
840 if (cmd != NULL) {
841 switch (cmd->command) {
842 case NFQNL_CFG_CMD_BIND:
843 if (queue) {
844 ret = -EBUSY;
845 goto err_out_unlock;
846 }
847 queue = instance_create(queue_num, NETLINK_CB(skb).portid);
848 if (IS_ERR(queue)) {
849 ret = PTR_ERR(queue);
850 goto err_out_unlock;
851 }
852 break;
853 case NFQNL_CFG_CMD_UNBIND:
854 if (!queue) {
855 ret = -ENODEV;
856 goto err_out_unlock;
857 }
858 instance_destroy(queue);
859 break;
860 case NFQNL_CFG_CMD_PF_BIND:
861 case NFQNL_CFG_CMD_PF_UNBIND:
862 break;
863 default:
864 ret = -ENOTSUPP;
865 break;
866 }
867 }
868
869 if (nfqa[NFQA_CFG_PARAMS]) {
870 struct nfqnl_msg_config_params *params;
871
872 if (!queue) {
873 ret = -ENODEV;
874 goto err_out_unlock;
875 }
876 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
877 nfqnl_set_mode(queue, params->copy_mode,
878 ntohl(params->copy_range));
879 }
880
881 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
882 __be32 *queue_maxlen;
883
884 if (!queue) {
885 ret = -ENODEV;
886 goto err_out_unlock;
887 }
888 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
889 spin_lock_bh(&queue->lock);
890 queue->queue_maxlen = ntohl(*queue_maxlen);
891 spin_unlock_bh(&queue->lock);
892 }
893
894 if (nfqa[NFQA_CFG_FLAGS]) {
895 __u32 flags, mask;
896
897 if (!queue) {
898 ret = -ENODEV;
899 goto err_out_unlock;
900 }
901
902 if (!nfqa[NFQA_CFG_MASK]) {
903 /* A mask is needed to specify which flags are being
904 * changed.
905 */
906 ret = -EINVAL;
907 goto err_out_unlock;
908 }
909
910 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
911 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
912
913 if (flags >= NFQA_CFG_F_MAX) {
914 ret = -EOPNOTSUPP;
915 goto err_out_unlock;
916 }
917
918 spin_lock_bh(&queue->lock);
919 queue->flags &= ~mask;
920 queue->flags |= flags & mask;
921 spin_unlock_bh(&queue->lock);
922 }
923
924 err_out_unlock:
925 rcu_read_unlock();
926 return ret;
927 }
928
929 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
930 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
931 .attr_count = NFQA_MAX, },
932 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
933 .attr_count = NFQA_MAX,
934 .policy = nfqa_verdict_policy },
935 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
936 .attr_count = NFQA_CFG_MAX,
937 .policy = nfqa_cfg_policy },
938 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
939 .attr_count = NFQA_MAX,
940 .policy = nfqa_verdict_batch_policy },
941 };
942
943 static const struct nfnetlink_subsystem nfqnl_subsys = {
944 .name = "nf_queue",
945 .subsys_id = NFNL_SUBSYS_QUEUE,
946 .cb_count = NFQNL_MSG_MAX,
947 .cb = nfqnl_cb,
948 };
949
950 #ifdef CONFIG_PROC_FS
951 struct iter_state {
952 unsigned int bucket;
953 };
954
955 static struct hlist_node *get_first(struct seq_file *seq)
956 {
957 struct iter_state *st = seq->private;
958
959 if (!st)
960 return NULL;
961
962 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
963 if (!hlist_empty(&instance_table[st->bucket]))
964 return instance_table[st->bucket].first;
965 }
966 return NULL;
967 }
968
969 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
970 {
971 struct iter_state *st = seq->private;
972
973 h = h->next;
974 while (!h) {
975 if (++st->bucket >= INSTANCE_BUCKETS)
976 return NULL;
977
978 h = instance_table[st->bucket].first;
979 }
980 return h;
981 }
982
983 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
984 {
985 struct hlist_node *head;
986 head = get_first(seq);
987
988 if (head)
989 while (pos && (head = get_next(seq, head)))
990 pos--;
991 return pos ? NULL : head;
992 }
993
994 static void *seq_start(struct seq_file *seq, loff_t *pos)
995 __acquires(instances_lock)
996 {
997 spin_lock(&instances_lock);
998 return get_idx(seq, *pos);
999 }
1000
1001 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1002 {
1003 (*pos)++;
1004 return get_next(s, v);
1005 }
1006
1007 static void seq_stop(struct seq_file *s, void *v)
1008 __releases(instances_lock)
1009 {
1010 spin_unlock(&instances_lock);
1011 }
1012
1013 static int seq_show(struct seq_file *s, void *v)
1014 {
1015 const struct nfqnl_instance *inst = v;
1016
1017 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1018 inst->queue_num,
1019 inst->peer_portid, inst->queue_total,
1020 inst->copy_mode, inst->copy_range,
1021 inst->queue_dropped, inst->queue_user_dropped,
1022 inst->id_sequence, 1);
1023 }
1024
1025 static const struct seq_operations nfqnl_seq_ops = {
1026 .start = seq_start,
1027 .next = seq_next,
1028 .stop = seq_stop,
1029 .show = seq_show,
1030 };
1031
1032 static int nfqnl_open(struct inode *inode, struct file *file)
1033 {
1034 return seq_open_private(file, &nfqnl_seq_ops,
1035 sizeof(struct iter_state));
1036 }
1037
1038 static const struct file_operations nfqnl_file_ops = {
1039 .owner = THIS_MODULE,
1040 .open = nfqnl_open,
1041 .read = seq_read,
1042 .llseek = seq_lseek,
1043 .release = seq_release_private,
1044 };
1045
1046 #endif /* PROC_FS */
1047
1048 static int __init nfnetlink_queue_init(void)
1049 {
1050 int i, status = -ENOMEM;
1051
1052 for (i = 0; i < INSTANCE_BUCKETS; i++)
1053 INIT_HLIST_HEAD(&instance_table[i]);
1054
1055 netlink_register_notifier(&nfqnl_rtnl_notifier);
1056 status = nfnetlink_subsys_register(&nfqnl_subsys);
1057 if (status < 0) {
1058 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
1059 goto cleanup_netlink_notifier;
1060 }
1061
1062 #ifdef CONFIG_PROC_FS
1063 if (!proc_create("nfnetlink_queue", 0440,
1064 proc_net_netfilter, &nfqnl_file_ops))
1065 goto cleanup_subsys;
1066 #endif
1067
1068 register_netdevice_notifier(&nfqnl_dev_notifier);
1069 return status;
1070
1071 #ifdef CONFIG_PROC_FS
1072 cleanup_subsys:
1073 nfnetlink_subsys_unregister(&nfqnl_subsys);
1074 #endif
1075 cleanup_netlink_notifier:
1076 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1077 return status;
1078 }
1079
1080 static void __exit nfnetlink_queue_fini(void)
1081 {
1082 nf_unregister_queue_handlers(&nfqh);
1083 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1084 #ifdef CONFIG_PROC_FS
1085 remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
1086 #endif
1087 nfnetlink_subsys_unregister(&nfqnl_subsys);
1088 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1089
1090 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1091 }
1092
1093 MODULE_DESCRIPTION("netfilter packet queue handler");
1094 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1095 MODULE_LICENSE("GPL");
1096 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1097
1098 module_init(nfnetlink_queue_init);
1099 module_exit(nfnetlink_queue_fini);
kernel source for telekom puls (alcatel/mediatek)