1
2
3
4
5
6
7
8
9
10
11
12
13
14
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_bridge.h>
29#include <linux/netfilter/nfnetlink.h>
30#include <linux/netfilter/nfnetlink_queue.h>
31#include <linux/netfilter/nf_conntrack_common.h>
32#include <linux/list.h>
33#include <net/sock.h>
34#include <net/tcp_states.h>
35#include <net/netfilter/nf_queue.h>
36#include <net/netns/generic.h>
37
38#include <linux/atomic.h>
39
40#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41#include "../bridge/br_private.h"
42#endif
43
44#define NFQNL_QMAX_DEFAULT 1024
45
46
47
48
49
50
51
52#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
53
54struct nfqnl_instance {
55 struct hlist_node hlist;
56 struct rcu_head rcu;
57
58 u32 peer_portid;
59 unsigned int queue_maxlen;
60 unsigned int copy_range;
61 unsigned int queue_dropped;
62 unsigned int queue_user_dropped;
63
64
65 u_int16_t queue_num;
66 u_int8_t copy_mode;
67 u_int32_t flags;
68
69
70
71
72 spinlock_t lock ____cacheline_aligned_in_smp;
73 unsigned int queue_total;
74 unsigned int id_sequence;
75 struct list_head queue_list;
76};
77
78typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
79
80static unsigned int nfnl_queue_net_id __read_mostly;
81
82#define INSTANCE_BUCKETS 16
83struct nfnl_queue_net {
84 spinlock_t instances_lock;
85 struct hlist_head instance_table[INSTANCE_BUCKETS];
86};
87
88static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
89{
90 return net_generic(net, nfnl_queue_net_id);
91}
92
93static inline u_int8_t instance_hashfn(u_int16_t queue_num)
94{
95 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
96}
97
98static struct nfqnl_instance *
99instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
100{
101 struct hlist_head *head;
102 struct nfqnl_instance *inst;
103
104 head = &q->instance_table[instance_hashfn(queue_num)];
105 hlist_for_each_entry_rcu(inst, head, hlist) {
106 if (inst->queue_num == queue_num)
107 return inst;
108 }
109 return NULL;
110}
111
112static struct nfqnl_instance *
113instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
114{
115 struct nfqnl_instance *inst;
116 unsigned int h;
117 int err;
118
119 spin_lock(&q->instances_lock);
120 if (instance_lookup(q, queue_num)) {
121 err = -EEXIST;
122 goto out_unlock;
123 }
124
125 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
126 if (!inst) {
127 err = -ENOMEM;
128 goto out_unlock;
129 }
130
131 inst->queue_num = queue_num;
132 inst->peer_portid = portid;
133 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
134 inst->copy_range = NFQNL_MAX_COPY_RANGE;
135 inst->copy_mode = NFQNL_COPY_NONE;
136 spin_lock_init(&inst->lock);
137 INIT_LIST_HEAD(&inst->queue_list);
138
139 if (!try_module_get(THIS_MODULE)) {
140 err = -EAGAIN;
141 goto out_free;
142 }
143
144 h = instance_hashfn(queue_num);
145 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
146
147 spin_unlock(&q->instances_lock);
148
149 return inst;
150
151out_free:
152 kfree(inst);
153out_unlock:
154 spin_unlock(&q->instances_lock);
155 return ERR_PTR(err);
156}
157
158static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
159 unsigned long data);
160
161static void
162instance_destroy_rcu(struct rcu_head *head)
163{
164 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
165 rcu);
166
167 nfqnl_flush(inst, NULL, 0);
168 kfree(inst);
169 module_put(THIS_MODULE);
170}
171
172static void
173__instance_destroy(struct nfqnl_instance *inst)
174{
175 hlist_del_rcu(&inst->hlist);
176 call_rcu(&inst->rcu, instance_destroy_rcu);
177}
178
179static void
180instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
181{
182 spin_lock(&q->instances_lock);
183 __instance_destroy(inst);
184 spin_unlock(&q->instances_lock);
185}
186
187static inline void
188__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
189{
190 list_add_tail(&entry->list, &queue->queue_list);
191 queue->queue_total++;
192}
193
194static void
195__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
196{
197 list_del(&entry->list);
198 queue->queue_total--;
199}
200
201static struct nf_queue_entry *
202find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
203{
204 struct nf_queue_entry *entry = NULL, *i;
205
206 spin_lock_bh(&queue->lock);
207
208 list_for_each_entry(i, &queue->queue_list, list) {
209 if (i->id == id) {
210 entry = i;
211 break;
212 }
213 }
214
215 if (entry)
216 __dequeue_entry(queue, entry);
217
218 spin_unlock_bh(&queue->lock);
219
220 return entry;
221}
222
223static void
224nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
225{
226 struct nf_queue_entry *entry, *next;
227
228 spin_lock_bh(&queue->lock);
229 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
230 if (!cmpfn || cmpfn(entry, data)) {
231 list_del(&entry->list);
232 queue->queue_total--;
233 nf_reinject(entry, NF_DROP);
234 }
235 }
236 spin_unlock_bh(&queue->lock);
237}
238
239static int
240nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
241 bool csum_verify)
242{
243 __u32 flags = 0;
244
245 if (packet->ip_summed == CHECKSUM_PARTIAL)
246 flags = NFQA_SKB_CSUMNOTREADY;
247 else if (csum_verify)
248 flags = NFQA_SKB_CSUM_NOTVERIFIED;
249
250 if (skb_is_gso(packet))
251 flags |= NFQA_SKB_GSO;
252
253 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
254}
255
256static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
257{
258 const struct cred *cred;
259
260 if (!sk_fullsock(sk))
261 return 0;
262
263 read_lock_bh(&sk->sk_callback_lock);
264 if (sk->sk_socket && sk->sk_socket->file) {
265 cred = sk->sk_socket->file->f_cred;
266 if (nla_put_be32(skb, NFQA_UID,
267 htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
268 goto nla_put_failure;
269 if (nla_put_be32(skb, NFQA_GID,
270 htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
271 goto nla_put_failure;
272 }
273 read_unlock_bh(&sk->sk_callback_lock);
274 return 0;
275
276nla_put_failure:
277 read_unlock_bh(&sk->sk_callback_lock);
278 return -1;
279}
280
281static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
282{
283 u32 seclen = 0;
284#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
285 if (!skb || !sk_fullsock(skb->sk))
286 return 0;
287
288 read_lock_bh(&skb->sk->sk_callback_lock);
289
290 if (skb->secmark)
291 security_secid_to_secctx(skb->secmark, secdata, &seclen);
292
293 read_unlock_bh(&skb->sk->sk_callback_lock);
294#endif
295 return seclen;
296}
297
298static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
299{
300 struct sk_buff *entskb = entry->skb;
301 u32 nlalen = 0;
302
303 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
304 return 0;
305
306 if (skb_vlan_tag_present(entskb))
307 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
308 nla_total_size(sizeof(__be16)));
309
310 if (entskb->network_header > entskb->mac_header)
311 nlalen += nla_total_size((entskb->network_header -
312 entskb->mac_header));
313
314 return nlalen;
315}
316
317static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
318{
319 struct sk_buff *entskb = entry->skb;
320
321 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
322 return 0;
323
324 if (skb_vlan_tag_present(entskb)) {
325 struct nlattr *nest;
326
327 nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED);
328 if (!nest)
329 goto nla_put_failure;
330
331 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
332 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
333 goto nla_put_failure;
334
335 nla_nest_end(skb, nest);
336 }
337
338 if (entskb->mac_header < entskb->network_header) {
339 int len = (int)(entskb->network_header - entskb->mac_header);
340
341 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
342 goto nla_put_failure;
343 }
344
345 return 0;
346
347nla_put_failure:
348 return -1;
349}
350
351static struct sk_buff *
352nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
353 struct nf_queue_entry *entry,
354 __be32 **packet_id_ptr)
355{
356 size_t size;
357 size_t data_len = 0, cap_len = 0;
358 unsigned int hlen = 0;
359 struct sk_buff *skb;
360 struct nlattr *nla;
361 struct nfqnl_msg_packet_hdr *pmsg;
362 struct nlmsghdr *nlh;
363 struct nfgenmsg *nfmsg;
364 struct sk_buff *entskb = entry->skb;
365 struct net_device *indev;
366 struct net_device *outdev;
367 struct nf_conn *ct = NULL;
368 enum ip_conntrack_info uninitialized_var(ctinfo);
369 struct nfnl_ct_hook *nfnl_ct;
370 bool csum_verify;
371 char *secdata = NULL;
372 u32 seclen = 0;
373
374 size = nlmsg_total_size(sizeof(struct nfgenmsg))
375 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
376 + nla_total_size(sizeof(u_int32_t))
377 + nla_total_size(sizeof(u_int32_t))
378#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
379 + nla_total_size(sizeof(u_int32_t))
380 + nla_total_size(sizeof(u_int32_t))
381#endif
382 + nla_total_size(sizeof(u_int32_t))
383 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
384 + nla_total_size(sizeof(u_int32_t))
385 + nla_total_size(sizeof(u_int32_t));
386
387 if (entskb->tstamp)
388 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
389
390 size += nfqnl_get_bridge_size(entry);
391
392 if (entry->state.hook <= NF_INET_FORWARD ||
393 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
394 csum_verify = !skb_csum_unnecessary(entskb);
395 else
396 csum_verify = false;
397
398 outdev = entry->state.out;
399
400 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
401 case NFQNL_COPY_META:
402 case NFQNL_COPY_NONE:
403 break;
404
405 case NFQNL_COPY_PACKET:
406 if (!(queue->flags & NFQA_CFG_F_GSO) &&
407 entskb->ip_summed == CHECKSUM_PARTIAL &&
408 skb_checksum_help(entskb))
409 return NULL;
410
411 data_len = ACCESS_ONCE(queue->copy_range);
412 if (data_len > entskb->len)
413 data_len = entskb->len;
414
415 hlen = skb_zerocopy_headlen(entskb);
416 hlen = min_t(unsigned int, hlen, data_len);
417 size += sizeof(struct nlattr) + hlen;
418 cap_len = entskb->len;
419 break;
420 }
421
422 nfnl_ct = rcu_dereference(nfnl_ct_hook);
423
424 if (queue->flags & NFQA_CFG_F_CONNTRACK) {
425 if (nfnl_ct != NULL) {
426 ct = nfnl_ct->get_ct(entskb, &ctinfo);
427 if (ct != NULL)
428 size += nfnl_ct->build_size(ct);
429 }
430 }
431
432 if (queue->flags & NFQA_CFG_F_UID_GID) {
433 size += (nla_total_size(sizeof(u_int32_t))
434 + nla_total_size(sizeof(u_int32_t)));
435 }
436
437 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
438 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
439 if (seclen)
440 size += nla_total_size(seclen);
441 }
442
443 skb = alloc_skb(size, GFP_ATOMIC);
444 if (!skb) {
445 skb_tx_error(entskb);
446 goto nlmsg_failure;
447 }
448
449 nlh = nlmsg_put(skb, 0, 0,
450 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET),
451 sizeof(struct nfgenmsg), 0);
452 if (!nlh) {
453 skb_tx_error(entskb);
454 kfree_skb(skb);
455 goto nlmsg_failure;
456 }
457 nfmsg = nlmsg_data(nlh);
458 nfmsg->nfgen_family = entry->state.pf;
459 nfmsg->version = NFNETLINK_V0;
460 nfmsg->res_id = htons(queue->queue_num);
461
462 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
463 pmsg = nla_data(nla);
464 pmsg->hw_protocol = entskb->protocol;
465 pmsg->hook = entry->state.hook;
466 *packet_id_ptr = &pmsg->packet_id;
467
468 indev = entry->state.in;
469 if (indev) {
470#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
471 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
472 goto nla_put_failure;
473#else
474 if (entry->state.pf == PF_BRIDGE) {
475
476
477
478 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
479 htonl(indev->ifindex)) ||
480
481
482 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
483 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
484 goto nla_put_failure;
485 } else {
486 int physinif;
487
488
489
490 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
491 htonl(indev->ifindex)))
492 goto nla_put_failure;
493
494 physinif = nf_bridge_get_physinif(entskb);
495 if (physinif &&
496 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
497 htonl(physinif)))
498 goto nla_put_failure;
499 }
500#endif
501 }
502
503 if (outdev) {
504#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
505 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
506 goto nla_put_failure;
507#else
508 if (entry->state.pf == PF_BRIDGE) {
509
510
511
512 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
513 htonl(outdev->ifindex)) ||
514
515
516 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
517 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
518 goto nla_put_failure;
519 } else {
520 int physoutif;
521
522
523
524 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
525 htonl(outdev->ifindex)))
526 goto nla_put_failure;
527
528 physoutif = nf_bridge_get_physoutif(entskb);
529 if (physoutif &&
530 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
531 htonl(physoutif)))
532 goto nla_put_failure;
533 }
534#endif
535 }
536
537 if (entskb->mark &&
538 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
539 goto nla_put_failure;
540
541 if (indev && entskb->dev &&
542 entskb->mac_header != entskb->network_header) {
543 struct nfqnl_msg_packet_hw phw;
544 int len;
545
546 memset(&phw, 0, sizeof(phw));
547 len = dev_parse_header(entskb, phw.hw_addr);
548 if (len) {
549 phw.hw_addrlen = htons(len);
550 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
551 goto nla_put_failure;
552 }
553 }
554
555 if (nfqnl_put_bridge(entry, skb) < 0)
556 goto nla_put_failure;
557
558 if (entskb->tstamp) {
559 struct nfqnl_msg_packet_timestamp ts;
560 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp);
561
562 ts.sec = cpu_to_be64(kts.tv_sec);
563 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
564
565 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
566 goto nla_put_failure;
567 }
568
569 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
570 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
571 goto nla_put_failure;
572
573 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
574 goto nla_put_failure;
575
576 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
577 goto nla_put_failure;
578
579 if (cap_len > data_len &&
580 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
581 goto nla_put_failure;
582
583 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
584 goto nla_put_failure;
585
586 if (data_len) {
587 struct nlattr *nla;
588
589 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
590 goto nla_put_failure;
591
592 nla = skb_put(skb, sizeof(*nla));
593 nla->nla_type = NFQA_PAYLOAD;
594 nla->nla_len = nla_attr_size(data_len);
595
596 if (skb_zerocopy(skb, entskb, data_len, hlen))
597 goto nla_put_failure;
598 }
599
600 nlh->nlmsg_len = skb->len;
601 if (seclen)
602 security_release_secctx(secdata, seclen);
603 return skb;
604
605nla_put_failure:
606 skb_tx_error(entskb);
607 kfree_skb(skb);
608 net_err_ratelimited("nf_queue: error creating packet message\n");
609nlmsg_failure:
610 if (seclen)
611 security_release_secctx(secdata, seclen);
612 return NULL;
613}
614
615static int
616__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
617 struct nf_queue_entry *entry)
618{
619 struct sk_buff *nskb;
620 int err = -ENOBUFS;
621 __be32 *packet_id_ptr;
622 int failopen = 0;
623
624 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
625 if (nskb == NULL) {
626 err = -ENOMEM;
627 goto err_out;
628 }
629 spin_lock_bh(&queue->lock);
630
631 if (queue->queue_total >= queue->queue_maxlen) {
632 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
633 failopen = 1;
634 err = 0;
635 } else {
636 queue->queue_dropped++;
637 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
638 queue->queue_total);
639 }
640 goto err_out_free_nskb;
641 }
642 entry->id = ++queue->id_sequence;
643 *packet_id_ptr = htonl(entry->id);
644
645
646 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
647 if (err < 0) {
648 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
649 failopen = 1;
650 err = 0;
651 } else {
652 queue->queue_user_dropped++;
653 }
654 goto err_out_unlock;
655 }
656
657 __enqueue_entry(queue, entry);
658
659 spin_unlock_bh(&queue->lock);
660 return 0;
661
662err_out_free_nskb:
663 kfree_skb(nskb);
664err_out_unlock:
665 spin_unlock_bh(&queue->lock);
666 if (failopen)
667 nf_reinject(entry, NF_ACCEPT);
668err_out:
669 return err;
670}
671
672static struct nf_queue_entry *
673nf_queue_entry_dup(struct nf_queue_entry *e)
674{
675 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
676 if (entry)
677 nf_queue_entry_get_refs(entry);
678 return entry;
679}
680
681#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
682
683
684
685
686static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
687{
688 if (skb->nf_bridge)
689 __skb_push(skb, skb->network_header - skb->mac_header);
690}
691
692static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
693{
694 if (skb->nf_bridge)
695 __skb_pull(skb, skb->network_header - skb->mac_header);
696}
697#else
698#define nf_bridge_adjust_skb_data(s) do {} while (0)
699#define nf_bridge_adjust_segmented_data(s) do {} while (0)
700#endif
701
702static void free_entry(struct nf_queue_entry *entry)
703{
704 nf_queue_entry_release_refs(entry);
705 kfree(entry);
706}
707
708static int
709__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
710 struct sk_buff *skb, struct nf_queue_entry *entry)
711{
712 int ret = -ENOMEM;
713 struct nf_queue_entry *entry_seg;
714
715 nf_bridge_adjust_segmented_data(skb);
716
717 if (skb->next == NULL) {
718 struct sk_buff *gso_skb = entry->skb;
719 entry->skb = skb;
720 ret = __nfqnl_enqueue_packet(net, queue, entry);
721 if (ret)
722 entry->skb = gso_skb;
723 return ret;
724 }
725
726 skb->next = NULL;
727
728 entry_seg = nf_queue_entry_dup(entry);
729 if (entry_seg) {
730 entry_seg->skb = skb;
731 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
732 if (ret)
733 free_entry(entry_seg);
734 }
735 return ret;
736}
737
738static int
739nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
740{
741 unsigned int queued;
742 struct nfqnl_instance *queue;
743 struct sk_buff *skb, *segs;
744 int err = -ENOBUFS;
745 struct net *net = entry->state.net;
746 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
747
748
749 queue = instance_lookup(q, queuenum);
750 if (!queue)
751 return -ESRCH;
752
753 if (queue->copy_mode == NFQNL_COPY_NONE)
754 return -EINVAL;
755
756 skb = entry->skb;
757
758 switch (entry->state.pf) {
759 case NFPROTO_IPV4:
760 skb->protocol = htons(ETH_P_IP);
761 break;
762 case NFPROTO_IPV6:
763 skb->protocol = htons(ETH_P_IPV6);
764 break;
765 }
766
767 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
768 return __nfqnl_enqueue_packet(net, queue, entry);
769
770 nf_bridge_adjust_skb_data(skb);
771 segs = skb_gso_segment(skb, 0);
772
773
774
775
776 if (IS_ERR_OR_NULL(segs))
777 goto out_err;
778 queued = 0;
779 err = 0;
780 do {
781 struct sk_buff *nskb = segs->next;
782 if (err == 0)
783 err = __nfqnl_enqueue_packet_gso(net, queue,
784 segs, entry);
785 if (err == 0)
786 queued++;
787 else
788 kfree_skb(segs);
789 segs = nskb;
790 } while (segs);
791
792 if (queued) {
793 if (err)
794 free_entry(entry);
795 kfree_skb(skb);
796 return 0;
797 }
798 out_err:
799 nf_bridge_adjust_segmented_data(skb);
800 return err;
801}
802
803static int
804nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
805{
806 struct sk_buff *nskb;
807
808 if (diff < 0) {
809 if (pskb_trim(e->skb, data_len))
810 return -ENOMEM;
811 } else if (diff > 0) {
812 if (data_len > 0xFFFF)
813 return -EINVAL;
814 if (diff > skb_tailroom(e->skb)) {
815 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
816 diff, GFP_ATOMIC);
817 if (!nskb) {
818 printk(KERN_WARNING "nf_queue: OOM "
819 "in mangle, dropping packet\n");
820 return -ENOMEM;
821 }
822 kfree_skb(e->skb);
823 e->skb = nskb;
824 }
825 skb_put(e->skb, diff);
826 }
827 if (!skb_make_writable(e->skb, data_len))
828 return -ENOMEM;
829 skb_copy_to_linear_data(e->skb, data, data_len);
830 e->skb->ip_summed = CHECKSUM_NONE;
831 return 0;
832}
833
834static int
835nfqnl_set_mode(struct nfqnl_instance *queue,
836 unsigned char mode, unsigned int range)
837{
838 int status = 0;
839
840 spin_lock_bh(&queue->lock);
841 switch (mode) {
842 case NFQNL_COPY_NONE:
843 case NFQNL_COPY_META:
844 queue->copy_mode = mode;
845 queue->copy_range = 0;
846 break;
847
848 case NFQNL_COPY_PACKET:
849 queue->copy_mode = mode;
850 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
851 queue->copy_range = NFQNL_MAX_COPY_RANGE;
852 else
853 queue->copy_range = range;
854 break;
855
856 default:
857 status = -EINVAL;
858
859 }
860 spin_unlock_bh(&queue->lock);
861
862 return status;
863}
864
865static int
866dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
867{
868 if (entry->state.in)
869 if (entry->state.in->ifindex == ifindex)
870 return 1;
871 if (entry->state.out)
872 if (entry->state.out->ifindex == ifindex)
873 return 1;
874#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
875 if (entry->skb->nf_bridge) {
876 int physinif, physoutif;
877
878 physinif = nf_bridge_get_physinif(entry->skb);
879 physoutif = nf_bridge_get_physoutif(entry->skb);
880
881 if (physinif == ifindex || physoutif == ifindex)
882 return 1;
883 }
884#endif
885 return 0;
886}
887
888
889
890static void
891nfqnl_dev_drop(struct net *net, int ifindex)
892{
893 int i;
894 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
895
896 rcu_read_lock();
897
898 for (i = 0; i < INSTANCE_BUCKETS; i++) {
899 struct nfqnl_instance *inst;
900 struct hlist_head *head = &q->instance_table[i];
901
902 hlist_for_each_entry_rcu(inst, head, hlist)
903 nfqnl_flush(inst, dev_cmp, ifindex);
904 }
905
906 rcu_read_unlock();
907}
908
909static int
910nfqnl_rcv_dev_event(struct notifier_block *this,
911 unsigned long event, void *ptr)
912{
913 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
914
915
916 if (event == NETDEV_DOWN)
917 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
918 return NOTIFY_DONE;
919}
920
921static struct notifier_block nfqnl_dev_notifier = {
922 .notifier_call = nfqnl_rcv_dev_event,
923};
924
925static unsigned int nfqnl_nf_hook_drop(struct net *net)
926{
927 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
928 unsigned int instances = 0;
929 int i;
930
931 rcu_read_lock();
932 for (i = 0; i < INSTANCE_BUCKETS; i++) {
933 struct nfqnl_instance *inst;
934 struct hlist_head *head = &q->instance_table[i];
935
936 hlist_for_each_entry_rcu(inst, head, hlist) {
937 nfqnl_flush(inst, NULL, 0);
938 instances++;
939 }
940 }
941 rcu_read_unlock();
942
943 return instances;
944}
945
946static int
947nfqnl_rcv_nl_event(struct notifier_block *this,
948 unsigned long event, void *ptr)
949{
950 struct netlink_notify *n = ptr;
951 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
952
953 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
954 int i;
955
956
957 spin_lock(&q->instances_lock);
958 for (i = 0; i < INSTANCE_BUCKETS; i++) {
959 struct hlist_node *t2;
960 struct nfqnl_instance *inst;
961 struct hlist_head *head = &q->instance_table[i];
962
963 hlist_for_each_entry_safe(inst, t2, head, hlist) {
964 if (n->portid == inst->peer_portid)
965 __instance_destroy(inst);
966 }
967 }
968 spin_unlock(&q->instances_lock);
969 }
970 return NOTIFY_DONE;
971}
972
973static struct notifier_block nfqnl_rtnl_notifier = {
974 .notifier_call = nfqnl_rcv_nl_event,
975};
976
977static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
978 [NFQA_VLAN_TCI] = { .type = NLA_U16},
979 [NFQA_VLAN_PROTO] = { .type = NLA_U16},
980};
981
982static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
983 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
984 [NFQA_MARK] = { .type = NLA_U32 },
985 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
986 [NFQA_CT] = { .type = NLA_UNSPEC },
987 [NFQA_EXP] = { .type = NLA_UNSPEC },
988 [NFQA_VLAN] = { .type = NLA_NESTED },
989};
990
991static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
992 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
993 [NFQA_MARK] = { .type = NLA_U32 },
994};
995
996static struct nfqnl_instance *
997verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
998{
999 struct nfqnl_instance *queue;
1000
1001 queue = instance_lookup(q, queue_num);
1002 if (!queue)
1003 return ERR_PTR(-ENODEV);
1004
1005 if (queue->peer_portid != nlportid)
1006 return ERR_PTR(-EPERM);
1007
1008 return queue;
1009}
1010
1011static struct nfqnl_msg_verdict_hdr*
1012verdicthdr_get(const struct nlattr * const nfqa[])
1013{
1014 struct nfqnl_msg_verdict_hdr *vhdr;
1015 unsigned int verdict;
1016
1017 if (!nfqa[NFQA_VERDICT_HDR])
1018 return NULL;
1019
1020 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
1021 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
1022 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
1023 return NULL;
1024 return vhdr;
1025}
1026
1027static int nfq_id_after(unsigned int id, unsigned int max)
1028{
1029 return (int)(id - max) > 0;
1030}
1031
1032static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl,
1033 struct sk_buff *skb,
1034 const struct nlmsghdr *nlh,
1035 const struct nlattr * const nfqa[],
1036 struct netlink_ext_ack *extack)
1037{
1038 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1039 struct nf_queue_entry *entry, *tmp;
1040 unsigned int verdict, maxid;
1041 struct nfqnl_msg_verdict_hdr *vhdr;
1042 struct nfqnl_instance *queue;
1043 LIST_HEAD(batch_list);
1044 u16 queue_num = ntohs(nfmsg->res_id);
1045 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1046
1047 queue = verdict_instance_lookup(q, queue_num,
1048 NETLINK_CB(skb).portid);
1049 if (IS_ERR(queue))
1050 return PTR_ERR(queue);
1051
1052 vhdr = verdicthdr_get(nfqa);
1053 if (!vhdr)
1054 return -EINVAL;
1055
1056 verdict = ntohl(vhdr->verdict);
1057 maxid = ntohl(vhdr->id);
1058
1059 spin_lock_bh(&queue->lock);
1060
1061 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
1062 if (nfq_id_after(entry->id, maxid))
1063 break;
1064 __dequeue_entry(queue, entry);
1065 list_add_tail(&entry->list, &batch_list);
1066 }
1067
1068 spin_unlock_bh(&queue->lock);
1069
1070 if (list_empty(&batch_list))
1071 return -ENOENT;
1072
1073 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1074 if (nfqa[NFQA_MARK])
1075 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1076 nf_reinject(entry, verdict);
1077 }
1078 return 0;
1079}
1080
1081static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
1082 const struct nlmsghdr *nlh,
1083 const struct nlattr * const nfqa[],
1084 struct nf_queue_entry *entry,
1085 enum ip_conntrack_info *ctinfo)
1086{
1087 struct nf_conn *ct;
1088
1089 ct = nfnl_ct->get_ct(entry->skb, ctinfo);
1090 if (ct == NULL)
1091 return NULL;
1092
1093 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1094 return NULL;
1095
1096 if (nfqa[NFQA_EXP])
1097 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1098 NETLINK_CB(entry->skb).portid,
1099 nlmsg_report(nlh));
1100 return ct;
1101}
1102
1103static int nfqa_parse_bridge(struct nf_queue_entry *entry,
1104 const struct nlattr * const nfqa[])
1105{
1106 if (nfqa[NFQA_VLAN]) {
1107 struct nlattr *tb[NFQA_VLAN_MAX + 1];
1108 int err;
1109
1110 err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN],
1111 nfqa_vlan_policy, NULL);
1112 if (err < 0)
1113 return err;
1114
1115 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
1116 return -EINVAL;
1117
1118 entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]));
1119 entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]);
1120 }
1121
1122 if (nfqa[NFQA_L2HDR]) {
1123 int mac_header_len = entry->skb->network_header -
1124 entry->skb->mac_header;
1125
1126 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
1127 return -EINVAL;
1128 else if (mac_header_len > 0)
1129 memcpy(skb_mac_header(entry->skb),
1130 nla_data(nfqa[NFQA_L2HDR]),
1131 mac_header_len);
1132 }
1133
1134 return 0;
1135}
1136
1137static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl,
1138 struct sk_buff *skb,
1139 const struct nlmsghdr *nlh,
1140 const struct nlattr * const nfqa[],
1141 struct netlink_ext_ack *extack)
1142{
1143 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1144 u_int16_t queue_num = ntohs(nfmsg->res_id);
1145 struct nfqnl_msg_verdict_hdr *vhdr;
1146 struct nfqnl_instance *queue;
1147 unsigned int verdict;
1148 struct nf_queue_entry *entry;
1149 enum ip_conntrack_info uninitialized_var(ctinfo);
1150 struct nfnl_ct_hook *nfnl_ct;
1151 struct nf_conn *ct = NULL;
1152 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1153 int err;
1154
1155 queue = verdict_instance_lookup(q, queue_num,
1156 NETLINK_CB(skb).portid);
1157 if (IS_ERR(queue))
1158 return PTR_ERR(queue);
1159
1160 vhdr = verdicthdr_get(nfqa);
1161 if (!vhdr)
1162 return -EINVAL;
1163
1164 verdict = ntohl(vhdr->verdict);
1165
1166 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1167 if (entry == NULL)
1168 return -ENOENT;
1169
1170
1171 nfnl_ct = rcu_dereference(nfnl_ct_hook);
1172
1173 if (nfqa[NFQA_CT]) {
1174 if (nfnl_ct != NULL)
1175 ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
1176 }
1177
1178 if (entry->state.pf == PF_BRIDGE) {
1179 err = nfqa_parse_bridge(entry, nfqa);
1180 if (err < 0)
1181 return err;
1182 }
1183
1184 if (nfqa[NFQA_PAYLOAD]) {
1185 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1186 int diff = payload_len - entry->skb->len;
1187
1188 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1189 payload_len, entry, diff) < 0)
1190 verdict = NF_DROP;
1191
1192 if (ct && diff)
1193 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1194 }
1195
1196 if (nfqa[NFQA_MARK])
1197 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1198
1199 nf_reinject(entry, verdict);
1200 return 0;
1201}
1202
1203static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl,
1204 struct sk_buff *skb, const struct nlmsghdr *nlh,
1205 const struct nlattr * const nfqa[],
1206 struct netlink_ext_ack *extack)
1207{
1208 return -ENOTSUPP;
1209}
1210
1211static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1212 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1213 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1214};
1215
1216static const struct nf_queue_handler nfqh = {
1217 .outfn = nfqnl_enqueue_packet,
1218 .nf_hook_drop = nfqnl_nf_hook_drop,
1219};
1220
1221static int nfqnl_recv_config(struct net *net, struct sock *ctnl,
1222 struct sk_buff *skb, const struct nlmsghdr *nlh,
1223 const struct nlattr * const nfqa[],
1224 struct netlink_ext_ack *extack)
1225{
1226 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1227 u_int16_t queue_num = ntohs(nfmsg->res_id);
1228 struct nfqnl_instance *queue;
1229 struct nfqnl_msg_config_cmd *cmd = NULL;
1230 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1231 __u32 flags = 0, mask = 0;
1232 int ret = 0;
1233
1234 if (nfqa[NFQA_CFG_CMD]) {
1235 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1236
1237
1238 switch (cmd->command) {
1239 case NFQNL_CFG_CMD_PF_BIND: return 0;
1240 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1241 }
1242 }
1243
1244
1245
1246
1247 if (nfqa[NFQA_CFG_FLAGS]) {
1248 if (!nfqa[NFQA_CFG_MASK]) {
1249
1250
1251
1252 return -EINVAL;
1253 }
1254
1255 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1256 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1257
1258 if (flags >= NFQA_CFG_F_MAX)
1259 return -EOPNOTSUPP;
1260
1261#if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1262 if (flags & mask & NFQA_CFG_F_SECCTX)
1263 return -EOPNOTSUPP;
1264#endif
1265 if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
1266 !rcu_access_pointer(nfnl_ct_hook)) {
1267#ifdef CONFIG_MODULES
1268 nfnl_unlock(NFNL_SUBSYS_QUEUE);
1269 request_module("ip_conntrack_netlink");
1270 nfnl_lock(NFNL_SUBSYS_QUEUE);
1271 if (rcu_access_pointer(nfnl_ct_hook))
1272 return -EAGAIN;
1273#endif
1274 return -EOPNOTSUPP;
1275 }
1276 }
1277
1278 rcu_read_lock();
1279 queue = instance_lookup(q, queue_num);
1280 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1281 ret = -EPERM;
1282 goto err_out_unlock;
1283 }
1284
1285 if (cmd != NULL) {
1286 switch (cmd->command) {
1287 case NFQNL_CFG_CMD_BIND:
1288 if (queue) {
1289 ret = -EBUSY;
1290 goto err_out_unlock;
1291 }
1292 queue = instance_create(q, queue_num,
1293 NETLINK_CB(skb).portid);
1294 if (IS_ERR(queue)) {
1295 ret = PTR_ERR(queue);
1296 goto err_out_unlock;
1297 }
1298 break;
1299 case NFQNL_CFG_CMD_UNBIND:
1300 if (!queue) {
1301 ret = -ENODEV;
1302 goto err_out_unlock;
1303 }
1304 instance_destroy(q, queue);
1305 goto err_out_unlock;
1306 case NFQNL_CFG_CMD_PF_BIND:
1307 case NFQNL_CFG_CMD_PF_UNBIND:
1308 break;
1309 default:
1310 ret = -ENOTSUPP;
1311 goto err_out_unlock;
1312 }
1313 }
1314
1315 if (!queue) {
1316 ret = -ENODEV;
1317 goto err_out_unlock;
1318 }
1319
1320 if (nfqa[NFQA_CFG_PARAMS]) {
1321 struct nfqnl_msg_config_params *params =
1322 nla_data(nfqa[NFQA_CFG_PARAMS]);
1323
1324 nfqnl_set_mode(queue, params->copy_mode,
1325 ntohl(params->copy_range));
1326 }
1327
1328 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1329 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1330
1331 spin_lock_bh(&queue->lock);
1332 queue->queue_maxlen = ntohl(*queue_maxlen);
1333 spin_unlock_bh(&queue->lock);
1334 }
1335
1336 if (nfqa[NFQA_CFG_FLAGS]) {
1337 spin_lock_bh(&queue->lock);
1338 queue->flags &= ~mask;
1339 queue->flags |= flags & mask;
1340 spin_unlock_bh(&queue->lock);
1341 }
1342
1343err_out_unlock:
1344 rcu_read_unlock();
1345 return ret;
1346}
1347
1348static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1349 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1350 .attr_count = NFQA_MAX, },
1351 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1352 .attr_count = NFQA_MAX,
1353 .policy = nfqa_verdict_policy },
1354 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1355 .attr_count = NFQA_CFG_MAX,
1356 .policy = nfqa_cfg_policy },
1357 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1358 .attr_count = NFQA_MAX,
1359 .policy = nfqa_verdict_batch_policy },
1360};
1361
1362static const struct nfnetlink_subsystem nfqnl_subsys = {
1363 .name = "nf_queue",
1364 .subsys_id = NFNL_SUBSYS_QUEUE,
1365 .cb_count = NFQNL_MSG_MAX,
1366 .cb = nfqnl_cb,
1367};
1368
1369#ifdef CONFIG_PROC_FS
1370struct iter_state {
1371 struct seq_net_private p;
1372 unsigned int bucket;
1373};
1374
1375static struct hlist_node *get_first(struct seq_file *seq)
1376{
1377 struct iter_state *st = seq->private;
1378 struct net *net;
1379 struct nfnl_queue_net *q;
1380
1381 if (!st)
1382 return NULL;
1383
1384 net = seq_file_net(seq);
1385 q = nfnl_queue_pernet(net);
1386 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1387 if (!hlist_empty(&q->instance_table[st->bucket]))
1388 return q->instance_table[st->bucket].first;
1389 }
1390 return NULL;
1391}
1392
1393static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1394{
1395 struct iter_state *st = seq->private;
1396 struct net *net = seq_file_net(seq);
1397
1398 h = h->next;
1399 while (!h) {
1400 struct nfnl_queue_net *q;
1401
1402 if (++st->bucket >= INSTANCE_BUCKETS)
1403 return NULL;
1404
1405 q = nfnl_queue_pernet(net);
1406 h = q->instance_table[st->bucket].first;
1407 }
1408 return h;
1409}
1410
1411static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1412{
1413 struct hlist_node *head;
1414 head = get_first(seq);
1415
1416 if (head)
1417 while (pos && (head = get_next(seq, head)))
1418 pos--;
1419 return pos ? NULL : head;
1420}
1421
1422static void *seq_start(struct seq_file *s, loff_t *pos)
1423 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1424{
1425 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1426 return get_idx(s, *pos);
1427}
1428
1429static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1430{
1431 (*pos)++;
1432 return get_next(s, v);
1433}
1434
1435static void seq_stop(struct seq_file *s, void *v)
1436 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1437{
1438 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1439}
1440
1441static int seq_show(struct seq_file *s, void *v)
1442{
1443 const struct nfqnl_instance *inst = v;
1444
1445 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1446 inst->queue_num,
1447 inst->peer_portid, inst->queue_total,
1448 inst->copy_mode, inst->copy_range,
1449 inst->queue_dropped, inst->queue_user_dropped,
1450 inst->id_sequence, 1);
1451 return 0;
1452}
1453
1454static const struct seq_operations nfqnl_seq_ops = {
1455 .start = seq_start,
1456 .next = seq_next,
1457 .stop = seq_stop,
1458 .show = seq_show,
1459};
1460
1461static int nfqnl_open(struct inode *inode, struct file *file)
1462{
1463 return seq_open_net(inode, file, &nfqnl_seq_ops,
1464 sizeof(struct iter_state));
1465}
1466
1467static const struct file_operations nfqnl_file_ops = {
1468 .owner = THIS_MODULE,
1469 .open = nfqnl_open,
1470 .read = seq_read,
1471 .llseek = seq_lseek,
1472 .release = seq_release_net,
1473};
1474
1475#endif
1476
1477static int __net_init nfnl_queue_net_init(struct net *net)
1478{
1479 unsigned int i;
1480 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1481
1482 for (i = 0; i < INSTANCE_BUCKETS; i++)
1483 INIT_HLIST_HEAD(&q->instance_table[i]);
1484
1485 spin_lock_init(&q->instances_lock);
1486
1487#ifdef CONFIG_PROC_FS
1488 if (!proc_create("nfnetlink_queue", 0440,
1489 net->nf.proc_netfilter, &nfqnl_file_ops))
1490 return -ENOMEM;
1491#endif
1492 nf_register_queue_handler(net, &nfqh);
1493 return 0;
1494}
1495
1496static void __net_exit nfnl_queue_net_exit(struct net *net)
1497{
1498 nf_unregister_queue_handler(net);
1499#ifdef CONFIG_PROC_FS
1500 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1501#endif
1502}
1503
1504static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
1505{
1506 synchronize_rcu();
1507}
1508
1509static struct pernet_operations nfnl_queue_net_ops = {
1510 .init = nfnl_queue_net_init,
1511 .exit = nfnl_queue_net_exit,
1512 .exit_batch = nfnl_queue_net_exit_batch,
1513 .id = &nfnl_queue_net_id,
1514 .size = sizeof(struct nfnl_queue_net),
1515};
1516
1517static int __init nfnetlink_queue_init(void)
1518{
1519 int status;
1520
1521 status = register_pernet_subsys(&nfnl_queue_net_ops);
1522 if (status < 0) {
1523 pr_err("nf_queue: failed to register pernet ops\n");
1524 goto out;
1525 }
1526
1527 netlink_register_notifier(&nfqnl_rtnl_notifier);
1528 status = nfnetlink_subsys_register(&nfqnl_subsys);
1529 if (status < 0) {
1530 pr_err("nf_queue: failed to create netlink socket\n");
1531 goto cleanup_netlink_notifier;
1532 }
1533
1534 status = register_netdevice_notifier(&nfqnl_dev_notifier);
1535 if (status < 0) {
1536 pr_err("nf_queue: failed to register netdevice notifier\n");
1537 goto cleanup_netlink_subsys;
1538 }
1539
1540 return status;
1541
1542cleanup_netlink_subsys:
1543 nfnetlink_subsys_unregister(&nfqnl_subsys);
1544cleanup_netlink_notifier:
1545 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1546 unregister_pernet_subsys(&nfnl_queue_net_ops);
1547out:
1548 return status;
1549}
1550
1551static void __exit nfnetlink_queue_fini(void)
1552{
1553 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1554 nfnetlink_subsys_unregister(&nfqnl_subsys);
1555 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1556 unregister_pernet_subsys(&nfnl_queue_net_ops);
1557
1558 rcu_barrier();
1559}
1560
1561MODULE_DESCRIPTION("netfilter packet queue handler");
1562MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1563MODULE_LICENSE("GPL");
1564MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1565
1566module_init(nfnetlink_queue_init);
1567module_exit(nfnetlink_queue_fini);
1568
