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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
45
46
47
48
49
50#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
51
52struct nfqnl_instance {
53 struct hlist_node hlist;
54 struct rcu_head rcu;
55
56 int peer_portid;
57 unsigned int queue_maxlen;
58 unsigned int copy_range;
59 unsigned int queue_dropped;
60 unsigned int queue_user_dropped;
61
62
63 u_int16_t queue_num;
64 u_int8_t copy_mode;
65 u_int32_t flags;
66
67
68
69
70 spinlock_t lock;
71 unsigned int queue_total;
72 unsigned int id_sequence;
73 struct list_head queue_list;
74};
75
76typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
77
78static int nfnl_queue_net_id __read_mostly;
79
80#define INSTANCE_BUCKETS 16
81struct nfnl_queue_net {
82 spinlock_t instances_lock;
83 struct hlist_head instance_table[INSTANCE_BUCKETS];
84};
85
86static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
87{
88 return net_generic(net, nfnl_queue_net_id);
89}
90
91static inline u_int8_t instance_hashfn(u_int16_t queue_num)
92{
93 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
94}
95
96static struct nfqnl_instance *
97instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
98{
99 struct hlist_head *head;
100 struct nfqnl_instance *inst;
101
102 head = &q->instance_table[instance_hashfn(queue_num)];
103 hlist_for_each_entry_rcu(inst, head, hlist) {
104 if (inst->queue_num == queue_num)
105 return inst;
106 }
107 return NULL;
108}
109
110static struct nfqnl_instance *
111instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
112 int portid)
113{
114 struct nfqnl_instance *inst;
115 unsigned int h;
116 int err;
117
118 spin_lock(&q->instances_lock);
119 if (instance_lookup(q, queue_num)) {
120 err = -EEXIST;
121 goto out_unlock;
122 }
123
124 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
125 if (!inst) {
126 err = -ENOMEM;
127 goto out_unlock;
128 }
129
130 inst->queue_num = queue_num;
131 inst->peer_portid = portid;
132 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
133 inst->copy_range = NFQNL_MAX_COPY_RANGE;
134 inst->copy_mode = NFQNL_COPY_NONE;
135 spin_lock_init(&inst->lock);
136 INIT_LIST_HEAD(&inst->queue_list);
137
138 if (!try_module_get(THIS_MODULE)) {
139 err = -EAGAIN;
140 goto out_free;
141 }
142
143 h = instance_hashfn(queue_num);
144 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
145
146 spin_unlock(&q->instances_lock);
147
148 return inst;
149
150out_free:
151 kfree(inst);
152out_unlock:
153 spin_unlock(&q->instances_lock);
154 return ERR_PTR(err);
155}
156
157static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
158 unsigned long data);
159
160static void
161instance_destroy_rcu(struct rcu_head *head)
162{
163 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
164 rcu);
165
166 nfqnl_flush(inst, NULL, 0);
167 kfree(inst);
168 module_put(THIS_MODULE);
169}
170
171static void
172__instance_destroy(struct nfqnl_instance *inst)
173{
174 hlist_del_rcu(&inst->hlist);
175 call_rcu(&inst->rcu, instance_destroy_rcu);
176}
177
178static void
179instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
180{
181 spin_lock(&q->instances_lock);
182 __instance_destroy(inst);
183 spin_unlock(&q->instances_lock);
184}
185
186static inline void
187__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
188{
189 list_add_tail(&entry->list, &queue->queue_list);
190 queue->queue_total++;
191}
192
193static void
194__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
195{
196 list_del(&entry->list);
197 queue->queue_total--;
198}
199
200static struct nf_queue_entry *
201find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
202{
203 struct nf_queue_entry *entry = NULL, *i;
204
205 spin_lock_bh(&queue->lock);
206
207 list_for_each_entry(i, &queue->queue_list, list) {
208 if (i->id == id) {
209 entry = i;
210 break;
211 }
212 }
213
214 if (entry)
215 __dequeue_entry(queue, entry);
216
217 spin_unlock_bh(&queue->lock);
218
219 return entry;
220}
221
222static void
223nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
224{
225 struct nf_queue_entry *entry, *next;
226
227 spin_lock_bh(&queue->lock);
228 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
229 if (!cmpfn || cmpfn(entry, data)) {
230 list_del(&entry->list);
231 queue->queue_total--;
232 nf_reinject(entry, NF_DROP);
233 }
234 }
235 spin_unlock_bh(&queue->lock);
236}
237
238static void
239nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
240{
241 int i, j = 0;
242 int plen = 0;
243 struct page *page;
244 unsigned int offset;
245
246
247 if (len <= skb_tailroom(to)) {
248 skb_copy_bits(from, 0, skb_put(to, len), len);
249 return;
250 }
251
252 if (hlen) {
253 skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
254 len -= hlen;
255 } else {
256 plen = min_t(int, skb_headlen(from), len);
257 if (plen) {
258 page = virt_to_head_page(from->head);
259 offset = from->data - (unsigned char *)page_address(page);
260 __skb_fill_page_desc(to, 0, page, offset, plen);
261 get_page(page);
262 j = 1;
263 len -= plen;
264 }
265 }
266
267 to->truesize += len + plen;
268 to->len += len + plen;
269 to->data_len += len + plen;
270
271 for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
272 if (!len)
273 break;
274 skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
275 skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
276 len -= skb_shinfo(to)->frags[j].size;
277 skb_frag_ref(to, j);
278 j++;
279 }
280 skb_shinfo(to)->nr_frags = j;
281}
282
283static int
284nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
285 bool csum_verify)
286{
287 __u32 flags = 0;
288
289 if (packet->ip_summed == CHECKSUM_PARTIAL)
290 flags = NFQA_SKB_CSUMNOTREADY;
291 else if (csum_verify)
292 flags = NFQA_SKB_CSUM_NOTVERIFIED;
293
294 if (skb_is_gso(packet))
295 flags |= NFQA_SKB_GSO;
296
297 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
298}
299
300static struct sk_buff *
301nfqnl_build_packet_message(struct nfqnl_instance *queue,
302 struct nf_queue_entry *entry,
303 __be32 **packet_id_ptr)
304{
305 size_t size;
306 size_t data_len = 0, cap_len = 0;
307 int hlen = 0;
308 struct sk_buff *skb;
309 struct nlattr *nla;
310 struct nfqnl_msg_packet_hdr *pmsg;
311 struct nlmsghdr *nlh;
312 struct nfgenmsg *nfmsg;
313 struct sk_buff *entskb = entry->skb;
314 struct net_device *indev;
315 struct net_device *outdev;
316 struct nf_conn *ct = NULL;
317 enum ip_conntrack_info uninitialized_var(ctinfo);
318 bool csum_verify;
319
320 size = nlmsg_total_size(sizeof(struct nfgenmsg))
321 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
322 + nla_total_size(sizeof(u_int32_t))
323 + nla_total_size(sizeof(u_int32_t))
324#ifdef CONFIG_BRIDGE_NETFILTER
325 + nla_total_size(sizeof(u_int32_t))
326 + nla_total_size(sizeof(u_int32_t))
327#endif
328 + nla_total_size(sizeof(u_int32_t))
329 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
330 + nla_total_size(sizeof(u_int32_t))
331 + nla_total_size(sizeof(u_int32_t));
332
333 if (entskb->tstamp.tv64)
334 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
335
336 if (entry->hook <= NF_INET_FORWARD ||
337 (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
338 csum_verify = !skb_csum_unnecessary(entskb);
339 else
340 csum_verify = false;
341
342 outdev = entry->outdev;
343
344 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
345 case NFQNL_COPY_META:
346 case NFQNL_COPY_NONE:
347 break;
348
349 case NFQNL_COPY_PACKET:
350 if (!(queue->flags & NFQA_CFG_F_GSO) &&
351 entskb->ip_summed == CHECKSUM_PARTIAL &&
352 skb_checksum_help(entskb))
353 return NULL;
354
355 data_len = ACCESS_ONCE(queue->copy_range);
356 if (data_len > entskb->len)
357 data_len = entskb->len;
358
359 if (!entskb->head_frag ||
360 skb_headlen(entskb) < L1_CACHE_BYTES ||
361 skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS)
362 hlen = skb_headlen(entskb);
363
364 if (skb_has_frag_list(entskb))
365 hlen = entskb->len;
366 hlen = min_t(int, data_len, hlen);
367 size += sizeof(struct nlattr) + hlen;
368 cap_len = entskb->len;
369 break;
370 }
371
372 if (queue->flags & NFQA_CFG_F_CONNTRACK)
373 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
374
375 skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid,
376 GFP_ATOMIC);
377 if (!skb)
378 return NULL;
379
380 nlh = nlmsg_put(skb, 0, 0,
381 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
382 sizeof(struct nfgenmsg), 0);
383 if (!nlh) {
384 kfree_skb(skb);
385 return NULL;
386 }
387 nfmsg = nlmsg_data(nlh);
388 nfmsg->nfgen_family = entry->pf;
389 nfmsg->version = NFNETLINK_V0;
390 nfmsg->res_id = htons(queue->queue_num);
391
392 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
393 pmsg = nla_data(nla);
394 pmsg->hw_protocol = entskb->protocol;
395 pmsg->hook = entry->hook;
396 *packet_id_ptr = &pmsg->packet_id;
397
398 indev = entry->indev;
399 if (indev) {
400#ifndef CONFIG_BRIDGE_NETFILTER
401 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
402 goto nla_put_failure;
403#else
404 if (entry->pf == PF_BRIDGE) {
405
406
407
408 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
409 htonl(indev->ifindex)) ||
410
411
412 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
413 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
414 goto nla_put_failure;
415 } else {
416
417
418 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
419 htonl(indev->ifindex)))
420 goto nla_put_failure;
421 if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
422 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
423 htonl(entskb->nf_bridge->physindev->ifindex)))
424 goto nla_put_failure;
425 }
426#endif
427 }
428
429 if (outdev) {
430#ifndef CONFIG_BRIDGE_NETFILTER
431 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
432 goto nla_put_failure;
433#else
434 if (entry->pf == PF_BRIDGE) {
435
436
437
438 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
439 htonl(outdev->ifindex)) ||
440
441
442 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
443 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
444 goto nla_put_failure;
445 } else {
446
447
448 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
449 htonl(outdev->ifindex)))
450 goto nla_put_failure;
451 if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
452 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
453 htonl(entskb->nf_bridge->physoutdev->ifindex)))
454 goto nla_put_failure;
455 }
456#endif
457 }
458
459 if (entskb->mark &&
460 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
461 goto nla_put_failure;
462
463 if (indev && entskb->dev &&
464 entskb->mac_header != entskb->network_header) {
465 struct nfqnl_msg_packet_hw phw;
466 int len;
467
468 memset(&phw, 0, sizeof(phw));
469 len = dev_parse_header(entskb, phw.hw_addr);
470 if (len) {
471 phw.hw_addrlen = htons(len);
472 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
473 goto nla_put_failure;
474 }
475 }
476
477 if (entskb->tstamp.tv64) {
478 struct nfqnl_msg_packet_timestamp ts;
479 struct timeval tv = ktime_to_timeval(entskb->tstamp);
480 ts.sec = cpu_to_be64(tv.tv_sec);
481 ts.usec = cpu_to_be64(tv.tv_usec);
482
483 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
484 goto nla_put_failure;
485 }
486
487 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
488 goto nla_put_failure;
489
490 if (cap_len > data_len &&
491 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
492 goto nla_put_failure;
493
494 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
495 goto nla_put_failure;
496
497 if (data_len) {
498 struct nlattr *nla;
499
500 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
501 goto nla_put_failure;
502
503 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
504 nla->nla_type = NFQA_PAYLOAD;
505 nla->nla_len = nla_attr_size(data_len);
506
507 nfqnl_zcopy(skb, entskb, data_len, hlen);
508 }
509
510 nlh->nlmsg_len = skb->len;
511 return skb;
512
513nla_put_failure:
514 kfree_skb(skb);
515 net_err_ratelimited("nf_queue: error creating packet message\n");
516 return NULL;
517}
518
519static int
520__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
521 struct nf_queue_entry *entry)
522{
523 struct sk_buff *nskb;
524 int err = -ENOBUFS;
525 __be32 *packet_id_ptr;
526 int failopen = 0;
527
528 nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
529 if (nskb == NULL) {
530 err = -ENOMEM;
531 goto err_out;
532 }
533 spin_lock_bh(&queue->lock);
534
535 if (queue->queue_total >= queue->queue_maxlen) {
536 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
537 failopen = 1;
538 err = 0;
539 } else {
540 queue->queue_dropped++;
541 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
542 queue->queue_total);
543 }
544 goto err_out_free_nskb;
545 }
546 entry->id = ++queue->id_sequence;
547 *packet_id_ptr = htonl(entry->id);
548
549
550 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
551 if (err < 0) {
552 queue->queue_user_dropped++;
553 goto err_out_unlock;
554 }
555
556 __enqueue_entry(queue, entry);
557
558 spin_unlock_bh(&queue->lock);
559 return 0;
560
561err_out_free_nskb:
562 kfree_skb(nskb);
563err_out_unlock:
564 spin_unlock_bh(&queue->lock);
565 if (failopen)
566 nf_reinject(entry, NF_ACCEPT);
567err_out:
568 return err;
569}
570
571static struct nf_queue_entry *
572nf_queue_entry_dup(struct nf_queue_entry *e)
573{
574 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
575 if (entry) {
576 if (nf_queue_entry_get_refs(entry))
577 return entry;
578 kfree(entry);
579 }
580 return NULL;
581}
582
583#ifdef CONFIG_BRIDGE_NETFILTER
584
585
586
587
588static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
589{
590 if (skb->nf_bridge)
591 __skb_push(skb, skb->network_header - skb->mac_header);
592}
593
594static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
595{
596 if (skb->nf_bridge)
597 __skb_pull(skb, skb->network_header - skb->mac_header);
598}
599#else
600#define nf_bridge_adjust_skb_data(s) do {} while (0)
601#define nf_bridge_adjust_segmented_data(s) do {} while (0)
602#endif
603
604static void free_entry(struct nf_queue_entry *entry)
605{
606 nf_queue_entry_release_refs(entry);
607 kfree(entry);
608}
609
610static int
611__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
612 struct sk_buff *skb, struct nf_queue_entry *entry)
613{
614 int ret = -ENOMEM;
615 struct nf_queue_entry *entry_seg;
616
617 nf_bridge_adjust_segmented_data(skb);
618
619 if (skb->next == NULL) {
620 struct sk_buff *gso_skb = entry->skb;
621 entry->skb = skb;
622 ret = __nfqnl_enqueue_packet(net, queue, entry);
623 if (ret)
624 entry->skb = gso_skb;
625 return ret;
626 }
627
628 skb->next = NULL;
629
630 entry_seg = nf_queue_entry_dup(entry);
631 if (entry_seg) {
632 entry_seg->skb = skb;
633 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
634 if (ret)
635 free_entry(entry_seg);
636 }
637 return ret;
638}
639
640static int
641nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
642{
643 unsigned int queued;
644 struct nfqnl_instance *queue;
645 struct sk_buff *skb, *segs;
646 int err = -ENOBUFS;
647 struct net *net = dev_net(entry->indev ?
648 entry->indev : entry->outdev);
649 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
650
651
652 queue = instance_lookup(q, queuenum);
653 if (!queue)
654 return -ESRCH;
655
656 if (queue->copy_mode == NFQNL_COPY_NONE)
657 return -EINVAL;
658
659 skb = entry->skb;
660
661 switch (entry->pf) {
662 case NFPROTO_IPV4:
663 skb->protocol = htons(ETH_P_IP);
664 break;
665 case NFPROTO_IPV6:
666 skb->protocol = htons(ETH_P_IPV6);
667 break;
668 }
669
670 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
671 return __nfqnl_enqueue_packet(net, queue, entry);
672
673 nf_bridge_adjust_skb_data(skb);
674 segs = skb_gso_segment(skb, 0);
675
676
677
678
679 if (IS_ERR(segs))
680 goto out_err;
681 queued = 0;
682 err = 0;
683 do {
684 struct sk_buff *nskb = segs->next;
685 if (err == 0)
686 err = __nfqnl_enqueue_packet_gso(net, queue,
687 segs, entry);
688 if (err == 0)
689 queued++;
690 else
691 kfree_skb(segs);
692 segs = nskb;
693 } while (segs);
694
695 if (queued) {
696 if (err)
697 free_entry(entry);
698 kfree_skb(skb);
699 return 0;
700 }
701 out_err:
702 nf_bridge_adjust_segmented_data(skb);
703 return err;
704}
705
706static int
707nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
708{
709 struct sk_buff *nskb;
710
711 if (diff < 0) {
712 if (pskb_trim(e->skb, data_len))
713 return -ENOMEM;
714 } else if (diff > 0) {
715 if (data_len > 0xFFFF)
716 return -EINVAL;
717 if (diff > skb_tailroom(e->skb)) {
718 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
719 diff, GFP_ATOMIC);
720 if (!nskb) {
721 printk(KERN_WARNING "nf_queue: OOM "
722 "in mangle, dropping packet\n");
723 return -ENOMEM;
724 }
725 kfree_skb(e->skb);
726 e->skb = nskb;
727 }
728 skb_put(e->skb, diff);
729 }
730 if (!skb_make_writable(e->skb, data_len))
731 return -ENOMEM;
732 skb_copy_to_linear_data(e->skb, data, data_len);
733 e->skb->ip_summed = CHECKSUM_NONE;
734 return 0;
735}
736
737static int
738nfqnl_set_mode(struct nfqnl_instance *queue,
739 unsigned char mode, unsigned int range)
740{
741 int status = 0;
742
743 spin_lock_bh(&queue->lock);
744 switch (mode) {
745 case NFQNL_COPY_NONE:
746 case NFQNL_COPY_META:
747 queue->copy_mode = mode;
748 queue->copy_range = 0;
749 break;
750
751 case NFQNL_COPY_PACKET:
752 queue->copy_mode = mode;
753 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
754 queue->copy_range = NFQNL_MAX_COPY_RANGE;
755 else
756 queue->copy_range = range;
757 break;
758
759 default:
760 status = -EINVAL;
761
762 }
763 spin_unlock_bh(&queue->lock);
764
765 return status;
766}
767
768static int
769dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
770{
771 if (entry->indev)
772 if (entry->indev->ifindex == ifindex)
773 return 1;
774 if (entry->outdev)
775 if (entry->outdev->ifindex == ifindex)
776 return 1;
777#ifdef CONFIG_BRIDGE_NETFILTER
778 if (entry->skb->nf_bridge) {
779 if (entry->skb->nf_bridge->physindev &&
780 entry->skb->nf_bridge->physindev->ifindex == ifindex)
781 return 1;
782 if (entry->skb->nf_bridge->physoutdev &&
783 entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
784 return 1;
785 }
786#endif
787 return 0;
788}
789
790
791
792static void
793nfqnl_dev_drop(struct net *net, int ifindex)
794{
795 int i;
796 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
797
798 rcu_read_lock();
799
800 for (i = 0; i < INSTANCE_BUCKETS; i++) {
801 struct nfqnl_instance *inst;
802 struct hlist_head *head = &q->instance_table[i];
803
804 hlist_for_each_entry_rcu(inst, head, hlist)
805 nfqnl_flush(inst, dev_cmp, ifindex);
806 }
807
808 rcu_read_unlock();
809}
810
811#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
812
813static int
814nfqnl_rcv_dev_event(struct notifier_block *this,
815 unsigned long event, void *ptr)
816{
817 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
818
819
820 if (event == NETDEV_DOWN)
821 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
822 return NOTIFY_DONE;
823}
824
825static struct notifier_block nfqnl_dev_notifier = {
826 .notifier_call = nfqnl_rcv_dev_event,
827};
828
829static int
830nfqnl_rcv_nl_event(struct notifier_block *this,
831 unsigned long event, void *ptr)
832{
833 struct netlink_notify *n = ptr;
834 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
835
836 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
837 int i;
838
839
840 spin_lock(&q->instances_lock);
841 for (i = 0; i < INSTANCE_BUCKETS; i++) {
842 struct hlist_node *t2;
843 struct nfqnl_instance *inst;
844 struct hlist_head *head = &q->instance_table[i];
845
846 hlist_for_each_entry_safe(inst, t2, head, hlist) {
847 if (n->portid == inst->peer_portid)
848 __instance_destroy(inst);
849 }
850 }
851 spin_unlock(&q->instances_lock);
852 }
853 return NOTIFY_DONE;
854}
855
856static struct notifier_block nfqnl_rtnl_notifier = {
857 .notifier_call = nfqnl_rcv_nl_event,
858};
859
860static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
861 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
862 [NFQA_MARK] = { .type = NLA_U32 },
863 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
864 [NFQA_CT] = { .type = NLA_UNSPEC },
865};
866
867static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
868 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
869 [NFQA_MARK] = { .type = NLA_U32 },
870};
871
872static struct nfqnl_instance *
873verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
874{
875 struct nfqnl_instance *queue;
876
877 queue = instance_lookup(q, queue_num);
878 if (!queue)
879 return ERR_PTR(-ENODEV);
880
881 if (queue->peer_portid != nlportid)
882 return ERR_PTR(-EPERM);
883
884 return queue;
885}
886
887static struct nfqnl_msg_verdict_hdr*
888verdicthdr_get(const struct nlattr * const nfqa[])
889{
890 struct nfqnl_msg_verdict_hdr *vhdr;
891 unsigned int verdict;
892
893 if (!nfqa[NFQA_VERDICT_HDR])
894 return NULL;
895
896 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
897 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
898 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
899 return NULL;
900 return vhdr;
901}
902
903static int nfq_id_after(unsigned int id, unsigned int max)
904{
905 return (int)(id - max) > 0;
906}
907
908static int
909nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
910 const struct nlmsghdr *nlh,
911 const struct nlattr * const nfqa[])
912{
913 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
914 struct nf_queue_entry *entry, *tmp;
915 unsigned int verdict, maxid;
916 struct nfqnl_msg_verdict_hdr *vhdr;
917 struct nfqnl_instance *queue;
918 LIST_HEAD(batch_list);
919 u16 queue_num = ntohs(nfmsg->res_id);
920
921 struct net *net = sock_net(ctnl);
922 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
923
924 queue = verdict_instance_lookup(q, queue_num,
925 NETLINK_CB(skb).portid);
926 if (IS_ERR(queue))
927 return PTR_ERR(queue);
928
929 vhdr = verdicthdr_get(nfqa);
930 if (!vhdr)
931 return -EINVAL;
932
933 verdict = ntohl(vhdr->verdict);
934 maxid = ntohl(vhdr->id);
935
936 spin_lock_bh(&queue->lock);
937
938 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
939 if (nfq_id_after(entry->id, maxid))
940 break;
941 __dequeue_entry(queue, entry);
942 list_add_tail(&entry->list, &batch_list);
943 }
944
945 spin_unlock_bh(&queue->lock);
946
947 if (list_empty(&batch_list))
948 return -ENOENT;
949
950 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
951 if (nfqa[NFQA_MARK])
952 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
953 nf_reinject(entry, verdict);
954 }
955 return 0;
956}
957
958static int
959nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
960 const struct nlmsghdr *nlh,
961 const struct nlattr * const nfqa[])
962{
963 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
964 u_int16_t queue_num = ntohs(nfmsg->res_id);
965
966 struct nfqnl_msg_verdict_hdr *vhdr;
967 struct nfqnl_instance *queue;
968 unsigned int verdict;
969 struct nf_queue_entry *entry;
970 enum ip_conntrack_info uninitialized_var(ctinfo);
971 struct nf_conn *ct = NULL;
972
973 struct net *net = sock_net(ctnl);
974 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
975
976 queue = instance_lookup(q, queue_num);
977 if (!queue)
978 queue = verdict_instance_lookup(q, queue_num,
979 NETLINK_CB(skb).portid);
980 if (IS_ERR(queue))
981 return PTR_ERR(queue);
982
983 vhdr = verdicthdr_get(nfqa);
984 if (!vhdr)
985 return -EINVAL;
986
987 verdict = ntohl(vhdr->verdict);
988
989 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
990 if (entry == NULL)
991 return -ENOENT;
992
993 rcu_read_lock();
994 if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
995 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
996
997 if (nfqa[NFQA_PAYLOAD]) {
998 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
999 int diff = payload_len - entry->skb->len;
1000
1001 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1002 payload_len, entry, diff) < 0)
1003 verdict = NF_DROP;
1004
1005 if (ct)
1006 nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
1007 }
1008 rcu_read_unlock();
1009
1010 if (nfqa[NFQA_MARK])
1011 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1012
1013 nf_reinject(entry, verdict);
1014 return 0;
1015}
1016
1017static int
1018nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1019 const struct nlmsghdr *nlh,
1020 const struct nlattr * const nfqa[])
1021{
1022 return -ENOTSUPP;
1023}
1024
1025static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1026 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1027 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1028};
1029
1030static const struct nf_queue_handler nfqh = {
1031 .outfn = &nfqnl_enqueue_packet,
1032};
1033
1034static int
1035nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1036 const struct nlmsghdr *nlh,
1037 const struct nlattr * const nfqa[])
1038{
1039 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1040 u_int16_t queue_num = ntohs(nfmsg->res_id);
1041 struct nfqnl_instance *queue;
1042 struct nfqnl_msg_config_cmd *cmd = NULL;
1043 struct net *net = sock_net(ctnl);
1044 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1045 int ret = 0;
1046
1047 if (nfqa[NFQA_CFG_CMD]) {
1048 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1049
1050
1051 switch (cmd->command) {
1052 case NFQNL_CFG_CMD_PF_BIND: return 0;
1053 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1054 }
1055 }
1056
1057 rcu_read_lock();
1058 queue = instance_lookup(q, queue_num);
1059 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1060 ret = -EPERM;
1061 goto err_out_unlock;
1062 }
1063
1064 if (cmd != NULL) {
1065 switch (cmd->command) {
1066 case NFQNL_CFG_CMD_BIND:
1067 if (queue) {
1068 ret = -EBUSY;
1069 goto err_out_unlock;
1070 }
1071 queue = instance_create(q, queue_num,
1072 NETLINK_CB(skb).portid);
1073 if (IS_ERR(queue)) {
1074 ret = PTR_ERR(queue);
1075 goto err_out_unlock;
1076 }
1077 break;
1078 case NFQNL_CFG_CMD_UNBIND:
1079 if (!queue) {
1080 ret = -ENODEV;
1081 goto err_out_unlock;
1082 }
1083 instance_destroy(q, queue);
1084 break;
1085 case NFQNL_CFG_CMD_PF_BIND:
1086 case NFQNL_CFG_CMD_PF_UNBIND:
1087 break;
1088 default:
1089 ret = -ENOTSUPP;
1090 break;
1091 }
1092 }
1093
1094 if (nfqa[NFQA_CFG_PARAMS]) {
1095 struct nfqnl_msg_config_params *params;
1096
1097 if (!queue) {
1098 ret = -ENODEV;
1099 goto err_out_unlock;
1100 }
1101 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1102 nfqnl_set_mode(queue, params->copy_mode,
1103 ntohl(params->copy_range));
1104 }
1105
1106 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1107 __be32 *queue_maxlen;
1108
1109 if (!queue) {
1110 ret = -ENODEV;
1111 goto err_out_unlock;
1112 }
1113 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1114 spin_lock_bh(&queue->lock);
1115 queue->queue_maxlen = ntohl(*queue_maxlen);
1116 spin_unlock_bh(&queue->lock);
1117 }
1118
1119 if (nfqa[NFQA_CFG_FLAGS]) {
1120 __u32 flags, mask;
1121
1122 if (!queue) {
1123 ret = -ENODEV;
1124 goto err_out_unlock;
1125 }
1126
1127 if (!nfqa[NFQA_CFG_MASK]) {
1128
1129
1130
1131 ret = -EINVAL;
1132 goto err_out_unlock;
1133 }
1134
1135 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1136 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1137
1138 if (flags >= NFQA_CFG_F_MAX) {
1139 ret = -EOPNOTSUPP;
1140 goto err_out_unlock;
1141 }
1142
1143 spin_lock_bh(&queue->lock);
1144 queue->flags &= ~mask;
1145 queue->flags |= flags & mask;
1146 spin_unlock_bh(&queue->lock);
1147 }
1148
1149err_out_unlock:
1150 rcu_read_unlock();
1151 return ret;
1152}
1153
1154static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1155 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1156 .attr_count = NFQA_MAX, },
1157 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1158 .attr_count = NFQA_MAX,
1159 .policy = nfqa_verdict_policy },
1160 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1161 .attr_count = NFQA_CFG_MAX,
1162 .policy = nfqa_cfg_policy },
1163 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1164 .attr_count = NFQA_MAX,
1165 .policy = nfqa_verdict_batch_policy },
1166};
1167
1168static const struct nfnetlink_subsystem nfqnl_subsys = {
1169 .name = "nf_queue",
1170 .subsys_id = NFNL_SUBSYS_QUEUE,
1171 .cb_count = NFQNL_MSG_MAX,
1172 .cb = nfqnl_cb,
1173};
1174
1175#ifdef CONFIG_PROC_FS
1176struct iter_state {
1177 struct seq_net_private p;
1178 unsigned int bucket;
1179};
1180
1181static struct hlist_node *get_first(struct seq_file *seq)
1182{
1183 struct iter_state *st = seq->private;
1184 struct net *net;
1185 struct nfnl_queue_net *q;
1186
1187 if (!st)
1188 return NULL;
1189
1190 net = seq_file_net(seq);
1191 q = nfnl_queue_pernet(net);
1192 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1193 if (!hlist_empty(&q->instance_table[st->bucket]))
1194 return q->instance_table[st->bucket].first;
1195 }
1196 return NULL;
1197}
1198
1199static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1200{
1201 struct iter_state *st = seq->private;
1202 struct net *net = seq_file_net(seq);
1203
1204 h = h->next;
1205 while (!h) {
1206 struct nfnl_queue_net *q;
1207
1208 if (++st->bucket >= INSTANCE_BUCKETS)
1209 return NULL;
1210
1211 q = nfnl_queue_pernet(net);
1212 h = q->instance_table[st->bucket].first;
1213 }
1214 return h;
1215}
1216
1217static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1218{
1219 struct hlist_node *head;
1220 head = get_first(seq);
1221
1222 if (head)
1223 while (pos && (head = get_next(seq, head)))
1224 pos--;
1225 return pos ? NULL : head;
1226}
1227
1228static void *seq_start(struct seq_file *s, loff_t *pos)
1229 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1230{
1231 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1232 return get_idx(s, *pos);
1233}
1234
1235static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1236{
1237 (*pos)++;
1238 return get_next(s, v);
1239}
1240
1241static void seq_stop(struct seq_file *s, void *v)
1242 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1243{
1244 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1245}
1246
1247static int seq_show(struct seq_file *s, void *v)
1248{
1249 const struct nfqnl_instance *inst = v;
1250
1251 return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1252 inst->queue_num,
1253 inst->peer_portid, inst->queue_total,
1254 inst->copy_mode, inst->copy_range,
1255 inst->queue_dropped, inst->queue_user_dropped,
1256 inst->id_sequence, 1);
1257}
1258
1259static const struct seq_operations nfqnl_seq_ops = {
1260 .start = seq_start,
1261 .next = seq_next,
1262 .stop = seq_stop,
1263 .show = seq_show,
1264};
1265
1266static int nfqnl_open(struct inode *inode, struct file *file)
1267{
1268 return seq_open_net(inode, file, &nfqnl_seq_ops,
1269 sizeof(struct iter_state));
1270}
1271
1272static const struct file_operations nfqnl_file_ops = {
1273 .owner = THIS_MODULE,
1274 .open = nfqnl_open,
1275 .read = seq_read,
1276 .llseek = seq_lseek,
1277 .release = seq_release_net,
1278};
1279
1280#endif
1281
1282static int __net_init nfnl_queue_net_init(struct net *net)
1283{
1284 unsigned int i;
1285 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1286
1287 for (i = 0; i < INSTANCE_BUCKETS; i++)
1288 INIT_HLIST_HEAD(&q->instance_table[i]);
1289
1290 spin_lock_init(&q->instances_lock);
1291
1292#ifdef CONFIG_PROC_FS
1293 if (!proc_create("nfnetlink_queue", 0440,
1294 net->nf.proc_netfilter, &nfqnl_file_ops))
1295 return -ENOMEM;
1296#endif
1297 return 0;
1298}
1299
1300static void __net_exit nfnl_queue_net_exit(struct net *net)
1301{
1302#ifdef CONFIG_PROC_FS
1303 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1304#endif
1305}
1306
1307static struct pernet_operations nfnl_queue_net_ops = {
1308 .init = nfnl_queue_net_init,
1309 .exit = nfnl_queue_net_exit,
1310 .id = &nfnl_queue_net_id,
1311 .size = sizeof(struct nfnl_queue_net),
1312};
1313
1314static int __init nfnetlink_queue_init(void)
1315{
1316 int status = -ENOMEM;
1317
1318 netlink_register_notifier(&nfqnl_rtnl_notifier);
1319 status = nfnetlink_subsys_register(&nfqnl_subsys);
1320 if (status < 0) {
1321 pr_err("nf_queue: failed to create netlink socket\n");
1322 goto cleanup_netlink_notifier;
1323 }
1324
1325 status = register_pernet_subsys(&nfnl_queue_net_ops);
1326 if (status < 0) {
1327 pr_err("nf_queue: failed to register pernet ops\n");
1328 goto cleanup_subsys;
1329 }
1330 register_netdevice_notifier(&nfqnl_dev_notifier);
1331 nf_register_queue_handler(&nfqh);
1332 return status;
1333
1334cleanup_subsys:
1335 nfnetlink_subsys_unregister(&nfqnl_subsys);
1336cleanup_netlink_notifier:
1337 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1338 return status;
1339}
1340
1341static void __exit nfnetlink_queue_fini(void)
1342{
1343 nf_unregister_queue_handler();
1344 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1345 unregister_pernet_subsys(&nfnl_queue_net_ops);
1346 nfnetlink_subsys_unregister(&nfqnl_subsys);
1347 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1348
1349 rcu_barrier();
1350}
1351
1352MODULE_DESCRIPTION("netfilter packet queue handler");
1353MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1354MODULE_LICENSE("GPL");
1355MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1356
1357module_init(nfnetlink_queue_init);
1358module_exit(nfnetlink_queue_fini);
1359
