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netfilter: nfnetlink_queue: add net namespace support for nfnetlink_queue
[GitHub/exynos8895/android_kernel_samsung_universal8895.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/netns/generic.h>
34 #include <net/netfilter/nfnetlink_queue.h>
35
36 #include <linux/atomic.h>
37
38 #ifdef CONFIG_BRIDGE_NETFILTER
39 #include "../bridge/br_private.h"
40 #endif
41
42 #define NFQNL_QMAX_DEFAULT 1024
43
44 struct nfqnl_instance {
45 struct hlist_node hlist; /* global list of queues */
46 struct rcu_head rcu;
47
48 int peer_portid;
49 unsigned int queue_maxlen;
50 unsigned int copy_range;
51 unsigned int queue_dropped;
52 unsigned int queue_user_dropped;
53
54
55 u_int16_t queue_num; /* number of this queue */
56 u_int8_t copy_mode;
57 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
58 /*
59 * Following fields are dirtied for each queued packet,
60 * keep them in same cache line if possible.
61 */
62 spinlock_t lock;
63 unsigned int queue_total;
64 unsigned int id_sequence; /* 'sequence' of pkt ids */
65 struct list_head queue_list; /* packets in queue */
66 };
67
68 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
69
70 static int nfnl_queue_net_id __read_mostly;
71
72 #define INSTANCE_BUCKETS 16
73 struct nfnl_queue_net {
74 spinlock_t instances_lock;
75 struct hlist_head instance_table[INSTANCE_BUCKETS];
76 };
77
78 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
79 {
80 return net_generic(net, nfnl_queue_net_id);
81 }
82
83 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
84 {
85 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
86 }
87
88 static struct nfqnl_instance *
89 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
90 {
91 struct hlist_head *head;
92 struct nfqnl_instance *inst;
93
94 head = &q->instance_table[instance_hashfn(queue_num)];
95 hlist_for_each_entry_rcu(inst, head, hlist) {
96 if (inst->queue_num == queue_num)
97 return inst;
98 }
99 return NULL;
100 }
101
102 static struct nfqnl_instance *
103 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
104 int portid)
105 {
106 struct nfqnl_instance *inst;
107 unsigned int h;
108 int err;
109
110 spin_lock(&q->instances_lock);
111 if (instance_lookup(q, queue_num)) {
112 err = -EEXIST;
113 goto out_unlock;
114 }
115
116 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
117 if (!inst) {
118 err = -ENOMEM;
119 goto out_unlock;
120 }
121
122 inst->queue_num = queue_num;
123 inst->peer_portid = portid;
124 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
125 inst->copy_range = 0xffff;
126 inst->copy_mode = NFQNL_COPY_NONE;
127 spin_lock_init(&inst->lock);
128 INIT_LIST_HEAD(&inst->queue_list);
129
130 if (!try_module_get(THIS_MODULE)) {
131 err = -EAGAIN;
132 goto out_free;
133 }
134
135 h = instance_hashfn(queue_num);
136 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
137
138 spin_unlock(&q->instances_lock);
139
140 return inst;
141
142 out_free:
143 kfree(inst);
144 out_unlock:
145 spin_unlock(&q->instances_lock);
146 return ERR_PTR(err);
147 }
148
149 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
150 unsigned long data);
151
152 static void
153 instance_destroy_rcu(struct rcu_head *head)
154 {
155 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
156 rcu);
157
158 nfqnl_flush(inst, NULL, 0);
159 kfree(inst);
160 module_put(THIS_MODULE);
161 }
162
163 static void
164 __instance_destroy(struct nfqnl_instance *inst)
165 {
166 hlist_del_rcu(&inst->hlist);
167 call_rcu(&inst->rcu, instance_destroy_rcu);
168 }
169
170 static void
171 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
172 {
173 spin_lock(&q->instances_lock);
174 __instance_destroy(inst);
175 spin_unlock(&q->instances_lock);
176 }
177
178 static inline void
179 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
180 {
181 list_add_tail(&entry->list, &queue->queue_list);
182 queue->queue_total++;
183 }
184
185 static void
186 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
187 {
188 list_del(&entry->list);
189 queue->queue_total--;
190 }
191
192 static struct nf_queue_entry *
193 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
194 {
195 struct nf_queue_entry *entry = NULL, *i;
196
197 spin_lock_bh(&queue->lock);
198
199 list_for_each_entry(i, &queue->queue_list, list) {
200 if (i->id == id) {
201 entry = i;
202 break;
203 }
204 }
205
206 if (entry)
207 __dequeue_entry(queue, entry);
208
209 spin_unlock_bh(&queue->lock);
210
211 return entry;
212 }
213
214 static void
215 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
216 {
217 struct nf_queue_entry *entry, *next;
218
219 spin_lock_bh(&queue->lock);
220 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
221 if (!cmpfn || cmpfn(entry, data)) {
222 list_del(&entry->list);
223 queue->queue_total--;
224 nf_reinject(entry, NF_DROP);
225 }
226 }
227 spin_unlock_bh(&queue->lock);
228 }
229
230 static void
231 nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
232 {
233 int i, j = 0;
234 int plen = 0; /* length of skb->head fragment */
235 struct page *page;
236 unsigned int offset;
237
238 /* dont bother with small payloads */
239 if (len <= skb_tailroom(to)) {
240 skb_copy_bits(from, 0, skb_put(to, len), len);
241 return;
242 }
243
244 if (hlen) {
245 skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
246 len -= hlen;
247 } else {
248 plen = min_t(int, skb_headlen(from), len);
249 if (plen) {
250 page = virt_to_head_page(from->head);
251 offset = from->data - (unsigned char *)page_address(page);
252 __skb_fill_page_desc(to, 0, page, offset, plen);
253 get_page(page);
254 j = 1;
255 len -= plen;
256 }
257 }
258
259 to->truesize += len + plen;
260 to->len += len + plen;
261 to->data_len += len + plen;
262
263 for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
264 if (!len)
265 break;
266 skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
267 skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
268 len -= skb_shinfo(to)->frags[j].size;
269 skb_frag_ref(to, j);
270 j++;
271 }
272 skb_shinfo(to)->nr_frags = j;
273 }
274
275 static struct sk_buff *
276 nfqnl_build_packet_message(struct nfqnl_instance *queue,
277 struct nf_queue_entry *entry,
278 __be32 **packet_id_ptr)
279 {
280 size_t size;
281 size_t data_len = 0, cap_len = 0;
282 int hlen = 0;
283 struct sk_buff *skb;
284 struct nlattr *nla;
285 struct nfqnl_msg_packet_hdr *pmsg;
286 struct nlmsghdr *nlh;
287 struct nfgenmsg *nfmsg;
288 struct sk_buff *entskb = entry->skb;
289 struct net_device *indev;
290 struct net_device *outdev;
291 struct nf_conn *ct = NULL;
292 enum ip_conntrack_info uninitialized_var(ctinfo);
293
294 size = NLMSG_SPACE(sizeof(struct nfgenmsg))
295 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
296 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
297 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
298 #ifdef CONFIG_BRIDGE_NETFILTER
299 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
300 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
301 #endif
302 + nla_total_size(sizeof(u_int32_t)) /* mark */
303 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
304 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
305
306 if (entskb->tstamp.tv64)
307 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
308
309 outdev = entry->outdev;
310
311 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
312 case NFQNL_COPY_META:
313 case NFQNL_COPY_NONE:
314 break;
315
316 case NFQNL_COPY_PACKET:
317 if (entskb->ip_summed == CHECKSUM_PARTIAL &&
318 skb_checksum_help(entskb))
319 return NULL;
320
321 data_len = ACCESS_ONCE(queue->copy_range);
322 if (data_len == 0 || data_len > entskb->len)
323 data_len = entskb->len;
324
325
326 if (!entskb->head_frag ||
327 skb_headlen(entskb) < L1_CACHE_BYTES ||
328 skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS)
329 hlen = skb_headlen(entskb);
330
331 if (skb_has_frag_list(entskb))
332 hlen = entskb->len;
333 hlen = min_t(int, data_len, hlen);
334 size += sizeof(struct nlattr) + hlen;
335 cap_len = entskb->len;
336 break;
337 }
338
339 if (queue->flags & NFQA_CFG_F_CONNTRACK)
340 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
341
342 skb = alloc_skb(size, GFP_ATOMIC);
343 if (!skb)
344 return NULL;
345
346 nlh = nlmsg_put(skb, 0, 0,
347 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
348 sizeof(struct nfgenmsg), 0);
349 if (!nlh) {
350 kfree_skb(skb);
351 return NULL;
352 }
353 nfmsg = nlmsg_data(nlh);
354 nfmsg->nfgen_family = entry->pf;
355 nfmsg->version = NFNETLINK_V0;
356 nfmsg->res_id = htons(queue->queue_num);
357
358 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
359 pmsg = nla_data(nla);
360 pmsg->hw_protocol = entskb->protocol;
361 pmsg->hook = entry->hook;
362 *packet_id_ptr = &pmsg->packet_id;
363
364 indev = entry->indev;
365 if (indev) {
366 #ifndef CONFIG_BRIDGE_NETFILTER
367 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
368 goto nla_put_failure;
369 #else
370 if (entry->pf == PF_BRIDGE) {
371 /* Case 1: indev is physical input device, we need to
372 * look for bridge group (when called from
373 * netfilter_bridge) */
374 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
375 htonl(indev->ifindex)) ||
376 /* this is the bridge group "brX" */
377 /* rcu_read_lock()ed by __nf_queue */
378 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
379 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
380 goto nla_put_failure;
381 } else {
382 /* Case 2: indev is bridge group, we need to look for
383 * physical device (when called from ipv4) */
384 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
385 htonl(indev->ifindex)))
386 goto nla_put_failure;
387 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
388 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
389 htonl(entskb->nf_bridge->physindev->ifindex)))
390 goto nla_put_failure;
391 }
392 #endif
393 }
394
395 if (outdev) {
396 #ifndef CONFIG_BRIDGE_NETFILTER
397 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
398 goto nla_put_failure;
399 #else
400 if (entry->pf == PF_BRIDGE) {
401 /* Case 1: outdev is physical output device, we need to
402 * look for bridge group (when called from
403 * netfilter_bridge) */
404 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
405 htonl(outdev->ifindex)) ||
406 /* this is the bridge group "brX" */
407 /* rcu_read_lock()ed by __nf_queue */
408 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
409 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
410 goto nla_put_failure;
411 } else {
412 /* Case 2: outdev is bridge group, we need to look for
413 * physical output device (when called from ipv4) */
414 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
415 htonl(outdev->ifindex)))
416 goto nla_put_failure;
417 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
418 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
419 htonl(entskb->nf_bridge->physoutdev->ifindex)))
420 goto nla_put_failure;
421 }
422 #endif
423 }
424
425 if (entskb->mark &&
426 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
427 goto nla_put_failure;
428
429 if (indev && entskb->dev &&
430 entskb->mac_header != entskb->network_header) {
431 struct nfqnl_msg_packet_hw phw;
432 int len = dev_parse_header(entskb, phw.hw_addr);
433 if (len) {
434 phw.hw_addrlen = htons(len);
435 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
436 goto nla_put_failure;
437 }
438 }
439
440 if (entskb->tstamp.tv64) {
441 struct nfqnl_msg_packet_timestamp ts;
442 struct timeval tv = ktime_to_timeval(entskb->tstamp);
443 ts.sec = cpu_to_be64(tv.tv_sec);
444 ts.usec = cpu_to_be64(tv.tv_usec);
445
446 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
447 goto nla_put_failure;
448 }
449
450 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
451 goto nla_put_failure;
452
453 if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
454 goto nla_put_failure;
455
456 if (data_len) {
457 struct nlattr *nla;
458
459 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
460 goto nla_put_failure;
461
462 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
463 nla->nla_type = NFQA_PAYLOAD;
464 nla->nla_len = nla_attr_size(data_len);
465
466 nfqnl_zcopy(skb, entskb, data_len, hlen);
467 }
468
469 nlh->nlmsg_len = skb->len;
470 return skb;
471
472 nla_put_failure:
473 kfree_skb(skb);
474 net_err_ratelimited("nf_queue: error creating packet message\n");
475 return NULL;
476 }
477
478 static int
479 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
480 {
481 struct sk_buff *nskb;
482 struct nfqnl_instance *queue;
483 int err = -ENOBUFS;
484 __be32 *packet_id_ptr;
485 int failopen = 0;
486 struct net *net = dev_net(entry->indev ?
487 entry->indev : entry->outdev);
488 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
489
490 /* rcu_read_lock()ed by nf_hook_slow() */
491 queue = instance_lookup(q, queuenum);
492 if (!queue) {
493 err = -ESRCH;
494 goto err_out;
495 }
496
497 if (queue->copy_mode == NFQNL_COPY_NONE) {
498 err = -EINVAL;
499 goto err_out;
500 }
501
502 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
503 if (nskb == NULL) {
504 err = -ENOMEM;
505 goto err_out;
506 }
507 spin_lock_bh(&queue->lock);
508
509 if (!queue->peer_portid) {
510 err = -EINVAL;
511 goto err_out_free_nskb;
512 }
513 if (queue->queue_total >= queue->queue_maxlen) {
514 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
515 failopen = 1;
516 err = 0;
517 } else {
518 queue->queue_dropped++;
519 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
520 queue->queue_total);
521 }
522 goto err_out_free_nskb;
523 }
524 entry->id = ++queue->id_sequence;
525 *packet_id_ptr = htonl(entry->id);
526
527 /* nfnetlink_unicast will either free the nskb or add it to a socket */
528 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
529 if (err < 0) {
530 queue->queue_user_dropped++;
531 goto err_out_unlock;
532 }
533
534 __enqueue_entry(queue, entry);
535
536 spin_unlock_bh(&queue->lock);
537 return 0;
538
539 err_out_free_nskb:
540 kfree_skb(nskb);
541 err_out_unlock:
542 spin_unlock_bh(&queue->lock);
543 if (failopen)
544 nf_reinject(entry, NF_ACCEPT);
545 err_out:
546 return err;
547 }
548
549 static int
550 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
551 {
552 struct sk_buff *nskb;
553
554 if (diff < 0) {
555 if (pskb_trim(e->skb, data_len))
556 return -ENOMEM;
557 } else if (diff > 0) {
558 if (data_len > 0xFFFF)
559 return -EINVAL;
560 if (diff > skb_tailroom(e->skb)) {
561 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
562 diff, GFP_ATOMIC);
563 if (!nskb) {
564 printk(KERN_WARNING "nf_queue: OOM "
565 "in mangle, dropping packet\n");
566 return -ENOMEM;
567 }
568 kfree_skb(e->skb);
569 e->skb = nskb;
570 }
571 skb_put(e->skb, diff);
572 }
573 if (!skb_make_writable(e->skb, data_len))
574 return -ENOMEM;
575 skb_copy_to_linear_data(e->skb, data, data_len);
576 e->skb->ip_summed = CHECKSUM_NONE;
577 return 0;
578 }
579
580 static int
581 nfqnl_set_mode(struct nfqnl_instance *queue,
582 unsigned char mode, unsigned int range)
583 {
584 int status = 0;
585
586 spin_lock_bh(&queue->lock);
587 switch (mode) {
588 case NFQNL_COPY_NONE:
589 case NFQNL_COPY_META:
590 queue->copy_mode = mode;
591 queue->copy_range = 0;
592 break;
593
594 case NFQNL_COPY_PACKET:
595 queue->copy_mode = mode;
596 /* We're using struct nlattr which has 16bit nla_len. Note that
597 * nla_len includes the header length. Thus, the maximum packet
598 * length that we support is 65531 bytes. We send truncated
599 * packets if the specified length is larger than that.
600 */
601 if (range > 0xffff - NLA_HDRLEN)
602 queue->copy_range = 0xffff - NLA_HDRLEN;
603 else
604 queue->copy_range = range;
605 break;
606
607 default:
608 status = -EINVAL;
609
610 }
611 spin_unlock_bh(&queue->lock);
612
613 return status;
614 }
615
616 static int
617 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
618 {
619 if (entry->indev)
620 if (entry->indev->ifindex == ifindex)
621 return 1;
622 if (entry->outdev)
623 if (entry->outdev->ifindex == ifindex)
624 return 1;
625 #ifdef CONFIG_BRIDGE_NETFILTER
626 if (entry->skb->nf_bridge) {
627 if (entry->skb->nf_bridge->physindev &&
628 entry->skb->nf_bridge->physindev->ifindex == ifindex)
629 return 1;
630 if (entry->skb->nf_bridge->physoutdev &&
631 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
632 return 1;
633 }
634 #endif
635 return 0;
636 }
637
638 /* drop all packets with either indev or outdev == ifindex from all queue
639 * instances */
640 static void
641 nfqnl_dev_drop(struct net *net, int ifindex)
642 {
643 int i;
644 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
645
646 rcu_read_lock();
647
648 for (i = 0; i < INSTANCE_BUCKETS; i++) {
649 struct nfqnl_instance *inst;
650 struct hlist_head *head = &q->instance_table[i];
651
652 hlist_for_each_entry_rcu(inst, head, hlist)
653 nfqnl_flush(inst, dev_cmp, ifindex);
654 }
655
656 rcu_read_unlock();
657 }
658
659 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
660
661 static int
662 nfqnl_rcv_dev_event(struct notifier_block *this,
663 unsigned long event, void *ptr)
664 {
665 struct net_device *dev = ptr;
666
667 /* Drop any packets associated with the downed device */
668 if (event == NETDEV_DOWN)
669 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
670 return NOTIFY_DONE;
671 }
672
673 static struct notifier_block nfqnl_dev_notifier = {
674 .notifier_call = nfqnl_rcv_dev_event,
675 };
676
677 static int
678 nfqnl_rcv_nl_event(struct notifier_block *this,
679 unsigned long event, void *ptr)
680 {
681 struct netlink_notify *n = ptr;
682 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
683
684 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
685 int i;
686
687 /* destroy all instances for this portid */
688 spin_lock(&q->instances_lock);
689 for (i = 0; i < INSTANCE_BUCKETS; i++) {
690 struct hlist_node *t2;
691 struct nfqnl_instance *inst;
692 struct hlist_head *head = &q->instance_table[i];
693
694 hlist_for_each_entry_safe(inst, t2, head, hlist) {
695 if (n->portid == inst->peer_portid)
696 __instance_destroy(inst);
697 }
698 }
699 spin_unlock(&q->instances_lock);
700 }
701 return NOTIFY_DONE;
702 }
703
704 static struct notifier_block nfqnl_rtnl_notifier = {
705 .notifier_call = nfqnl_rcv_nl_event,
706 };
707
708 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
709 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
710 [NFQA_MARK] = { .type = NLA_U32 },
711 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
712 [NFQA_CT] = { .type = NLA_UNSPEC },
713 };
714
715 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
716 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
717 [NFQA_MARK] = { .type = NLA_U32 },
718 };
719
720 static struct nfqnl_instance *
721 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
722 {
723 struct nfqnl_instance *queue;
724
725 queue = instance_lookup(q, queue_num);
726 if (!queue)
727 return ERR_PTR(-ENODEV);
728
729 if (queue->peer_portid != nlportid)
730 return ERR_PTR(-EPERM);
731
732 return queue;
733 }
734
735 static struct nfqnl_msg_verdict_hdr*
736 verdicthdr_get(const struct nlattr * const nfqa[])
737 {
738 struct nfqnl_msg_verdict_hdr *vhdr;
739 unsigned int verdict;
740
741 if (!nfqa[NFQA_VERDICT_HDR])
742 return NULL;
743
744 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
745 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
746 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
747 return NULL;
748 return vhdr;
749 }
750
751 static int nfq_id_after(unsigned int id, unsigned int max)
752 {
753 return (int)(id - max) > 0;
754 }
755
756 static int
757 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
758 const struct nlmsghdr *nlh,
759 const struct nlattr * const nfqa[])
760 {
761 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
762 struct nf_queue_entry *entry, *tmp;
763 unsigned int verdict, maxid;
764 struct nfqnl_msg_verdict_hdr *vhdr;
765 struct nfqnl_instance *queue;
766 LIST_HEAD(batch_list);
767 u16 queue_num = ntohs(nfmsg->res_id);
768
769 struct net *net = sock_net(ctnl);
770 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
771
772 queue = verdict_instance_lookup(q, queue_num,
773 NETLINK_CB(skb).portid);
774 if (IS_ERR(queue))
775 return PTR_ERR(queue);
776
777 vhdr = verdicthdr_get(nfqa);
778 if (!vhdr)
779 return -EINVAL;
780
781 verdict = ntohl(vhdr->verdict);
782 maxid = ntohl(vhdr->id);
783
784 spin_lock_bh(&queue->lock);
785
786 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
787 if (nfq_id_after(entry->id, maxid))
788 break;
789 __dequeue_entry(queue, entry);
790 list_add_tail(&entry->list, &batch_list);
791 }
792
793 spin_unlock_bh(&queue->lock);
794
795 if (list_empty(&batch_list))
796 return -ENOENT;
797
798 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
799 if (nfqa[NFQA_MARK])
800 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
801 nf_reinject(entry, verdict);
802 }
803 return 0;
804 }
805
806 static int
807 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
808 const struct nlmsghdr *nlh,
809 const struct nlattr * const nfqa[])
810 {
811 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
812 u_int16_t queue_num = ntohs(nfmsg->res_id);
813
814 struct nfqnl_msg_verdict_hdr *vhdr;
815 struct nfqnl_instance *queue;
816 unsigned int verdict;
817 struct nf_queue_entry *entry;
818 enum ip_conntrack_info uninitialized_var(ctinfo);
819 struct nf_conn *ct = NULL;
820
821 struct net *net = sock_net(ctnl);
822 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
823
824 queue = instance_lookup(q, queue_num);
825 if (!queue)
826 queue = verdict_instance_lookup(q, queue_num,
827 NETLINK_CB(skb).portid);
828 if (IS_ERR(queue))
829 return PTR_ERR(queue);
830
831 vhdr = verdicthdr_get(nfqa);
832 if (!vhdr)
833 return -EINVAL;
834
835 verdict = ntohl(vhdr->verdict);
836
837 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
838 if (entry == NULL)
839 return -ENOENT;
840
841 rcu_read_lock();
842 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
843 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
844
845 if (nfqa[NFQA_PAYLOAD]) {
846 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
847 int diff = payload_len - entry->skb->len;
848
849 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
850 payload_len, entry, diff) < 0)
851 verdict = NF_DROP;
852
853 if (ct)
854 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
855 }
856 rcu_read_unlock();
857
858 if (nfqa[NFQA_MARK])
859 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
860
861 nf_reinject(entry, verdict);
862 return 0;
863 }
864
865 static int
866 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
867 const struct nlmsghdr *nlh,
868 const struct nlattr * const nfqa[])
869 {
870 return -ENOTSUPP;
871 }
872
873 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
874 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
875 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
876 };
877
878 static const struct nf_queue_handler nfqh = {
879 .outfn = &nfqnl_enqueue_packet,
880 };
881
882 static int
883 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
884 const struct nlmsghdr *nlh,
885 const struct nlattr * const nfqa[])
886 {
887 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
888 u_int16_t queue_num = ntohs(nfmsg->res_id);
889 struct nfqnl_instance *queue;
890 struct nfqnl_msg_config_cmd *cmd = NULL;
891 struct net *net = sock_net(ctnl);
892 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
893 int ret = 0;
894
895 if (nfqa[NFQA_CFG_CMD]) {
896 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
897
898 /* Obsolete commands without queue context */
899 switch (cmd->command) {
900 case NFQNL_CFG_CMD_PF_BIND: return 0;
901 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
902 }
903 }
904
905 rcu_read_lock();
906 queue = instance_lookup(q, queue_num);
907 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
908 ret = -EPERM;
909 goto err_out_unlock;
910 }
911
912 if (cmd != NULL) {
913 switch (cmd->command) {
914 case NFQNL_CFG_CMD_BIND:
915 if (queue) {
916 ret = -EBUSY;
917 goto err_out_unlock;
918 }
919 queue = instance_create(q, queue_num,
920 NETLINK_CB(skb).portid);
921 if (IS_ERR(queue)) {
922 ret = PTR_ERR(queue);
923 goto err_out_unlock;
924 }
925 break;
926 case NFQNL_CFG_CMD_UNBIND:
927 if (!queue) {
928 ret = -ENODEV;
929 goto err_out_unlock;
930 }
931 instance_destroy(q, queue);
932 break;
933 case NFQNL_CFG_CMD_PF_BIND:
934 case NFQNL_CFG_CMD_PF_UNBIND:
935 break;
936 default:
937 ret = -ENOTSUPP;
938 break;
939 }
940 }
941
942 if (nfqa[NFQA_CFG_PARAMS]) {
943 struct nfqnl_msg_config_params *params;
944
945 if (!queue) {
946 ret = -ENODEV;
947 goto err_out_unlock;
948 }
949 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
950 nfqnl_set_mode(queue, params->copy_mode,
951 ntohl(params->copy_range));
952 }
953
954 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
955 __be32 *queue_maxlen;
956
957 if (!queue) {
958 ret = -ENODEV;
959 goto err_out_unlock;
960 }
961 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
962 spin_lock_bh(&queue->lock);
963 queue->queue_maxlen = ntohl(*queue_maxlen);
964 spin_unlock_bh(&queue->lock);
965 }
966
967 if (nfqa[NFQA_CFG_FLAGS]) {
968 __u32 flags, mask;
969
970 if (!queue) {
971 ret = -ENODEV;
972 goto err_out_unlock;
973 }
974
975 if (!nfqa[NFQA_CFG_MASK]) {
976 /* A mask is needed to specify which flags are being
977 * changed.
978 */
979 ret = -EINVAL;
980 goto err_out_unlock;
981 }
982
983 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
984 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
985
986 if (flags >= NFQA_CFG_F_MAX) {
987 ret = -EOPNOTSUPP;
988 goto err_out_unlock;
989 }
990
991 spin_lock_bh(&queue->lock);
992 queue->flags &= ~mask;
993 queue->flags |= flags & mask;
994 spin_unlock_bh(&queue->lock);
995 }
996
997 err_out_unlock:
998 rcu_read_unlock();
999 return ret;
1000 }
1001
1002 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1003 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1004 .attr_count = NFQA_MAX, },
1005 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1006 .attr_count = NFQA_MAX,
1007 .policy = nfqa_verdict_policy },
1008 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1009 .attr_count = NFQA_CFG_MAX,
1010 .policy = nfqa_cfg_policy },
1011 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1012 .attr_count = NFQA_MAX,
1013 .policy = nfqa_verdict_batch_policy },
1014 };
1015
1016 static const struct nfnetlink_subsystem nfqnl_subsys = {
1017 .name = "nf_queue",
1018 .subsys_id = NFNL_SUBSYS_QUEUE,
1019 .cb_count = NFQNL_MSG_MAX,
1020 .cb = nfqnl_cb,
1021 };
1022
1023 #ifdef CONFIG_PROC_FS
1024 struct iter_state {
1025 struct seq_net_private p;
1026 unsigned int bucket;
1027 };
1028
1029 static struct hlist_node *get_first(struct seq_file *seq)
1030 {
1031 struct iter_state *st = seq->private;
1032 struct net *net;
1033 struct nfnl_queue_net *q;
1034
1035 if (!st)
1036 return NULL;
1037
1038 net = seq_file_net(seq);
1039 q = nfnl_queue_pernet(net);
1040 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1041 if (!hlist_empty(&q->instance_table[st->bucket]))
1042 return q->instance_table[st->bucket].first;
1043 }
1044 return NULL;
1045 }
1046
1047 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1048 {
1049 struct iter_state *st = seq->private;
1050 struct net *net = seq_file_net(seq);
1051
1052 h = h->next;
1053 while (!h) {
1054 struct nfnl_queue_net *q;
1055
1056 if (++st->bucket >= INSTANCE_BUCKETS)
1057 return NULL;
1058
1059 q = nfnl_queue_pernet(net);
1060 h = q->instance_table[st->bucket].first;
1061 }
1062 return h;
1063 }
1064
1065 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1066 {
1067 struct hlist_node *head;
1068 head = get_first(seq);
1069
1070 if (head)
1071 while (pos && (head = get_next(seq, head)))
1072 pos--;
1073 return pos ? NULL : head;
1074 }
1075
1076 static void *seq_start(struct seq_file *s, loff_t *pos)
1077 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1078 {
1079 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1080 return get_idx(s, *pos);
1081 }
1082
1083 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1084 {
1085 (*pos)++;
1086 return get_next(s, v);
1087 }
1088
1089 static void seq_stop(struct seq_file *s, void *v)
1090 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1091 {
1092 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1093 }
1094
1095 static int seq_show(struct seq_file *s, void *v)
1096 {
1097 const struct nfqnl_instance *inst = v;
1098
1099 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1100 inst->queue_num,
1101 inst->peer_portid, inst->queue_total,
1102 inst->copy_mode, inst->copy_range,
1103 inst->queue_dropped, inst->queue_user_dropped,
1104 inst->id_sequence, 1);
1105 }
1106
1107 static const struct seq_operations nfqnl_seq_ops = {
1108 .start = seq_start,
1109 .next = seq_next,
1110 .stop = seq_stop,
1111 .show = seq_show,
1112 };
1113
1114 static int nfqnl_open(struct inode *inode, struct file *file)
1115 {
1116 return seq_open_net(inode, file, &nfqnl_seq_ops,
1117 sizeof(struct iter_state));
1118 }
1119
1120 static const struct file_operations nfqnl_file_ops = {
1121 .owner = THIS_MODULE,
1122 .open = nfqnl_open,
1123 .read = seq_read,
1124 .llseek = seq_lseek,
1125 .release = seq_release_net,
1126 };
1127
1128 #endif /* PROC_FS */
1129
1130 static int __net_init nfnl_queue_net_init(struct net *net)
1131 {
1132 unsigned int i;
1133 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1134
1135 for (i = 0; i < INSTANCE_BUCKETS; i++)
1136 INIT_HLIST_HEAD(&q->instance_table[i]);
1137
1138 spin_lock_init(&q->instances_lock);
1139
1140 #ifdef CONFIG_PROC_FS
1141 if (!proc_create("nfnetlink_queue", 0440,
1142 net->nf.proc_netfilter, &nfqnl_file_ops))
1143 return -ENOMEM;
1144 #endif
1145 return 0;
1146 }
1147
1148 static void __net_exit nfnl_queue_net_exit(struct net *net)
1149 {
1150 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1151 }
1152
1153 static struct pernet_operations nfnl_queue_net_ops = {
1154 .init = nfnl_queue_net_init,
1155 .exit = nfnl_queue_net_exit,
1156 .id = &nfnl_queue_net_id,
1157 .size = sizeof(struct nfnl_queue_net),
1158 };
1159
1160 static int __init nfnetlink_queue_init(void)
1161 {
1162 int status = -ENOMEM;
1163
1164 netlink_register_notifier(&nfqnl_rtnl_notifier);
1165 status = nfnetlink_subsys_register(&nfqnl_subsys);
1166 if (status < 0) {
1167 pr_err("nf_queue: failed to create netlink socket\n");
1168 goto cleanup_netlink_notifier;
1169 }
1170
1171 status = register_pernet_subsys(&nfnl_queue_net_ops);
1172 if (status < 0) {
1173 pr_err("nf_queue: failed to register pernet ops\n");
1174 goto cleanup_subsys;
1175 }
1176 register_netdevice_notifier(&nfqnl_dev_notifier);
1177 nf_register_queue_handler(&nfqh);
1178 return status;
1179
1180 cleanup_subsys:
1181 nfnetlink_subsys_unregister(&nfqnl_subsys);
1182 cleanup_netlink_notifier:
1183 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1184 return status;
1185 }
1186
1187 static void __exit nfnetlink_queue_fini(void)
1188 {
1189 nf_unregister_queue_handler();
1190 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1191 unregister_pernet_subsys(&nfnl_queue_net_ops);
1192 nfnetlink_subsys_unregister(&nfqnl_subsys);
1193 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1194
1195 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1196 }
1197
1198 MODULE_DESCRIPTION("netfilter packet queue handler");
1199 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1200 MODULE_LICENSE("GPL");
1201 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1202
1203 module_init(nfnetlink_queue_init);
1204 module_exit(nfnetlink_queue_fini);