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13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/module.h>
17#include <linux/skbuff.h>
18#include <linux/init.h>
19#include <linux/spinlock.h>
20#include <linux/slab.h>
21#include <linux/notifier.h>
22#include <linux/netdevice.h>
23#include <linux/netfilter.h>
24#include <linux/proc_fs.h>
25#include <linux/netfilter_ipv4.h>
26#include <linux/netfilter_ipv6.h>
27#include <linux/netfilter_bridge.h>
28#include <linux/netfilter/nfnetlink.h>
29#include <linux/netfilter/nfnetlink_queue.h>
30#include <linux/netfilter/nf_conntrack_common.h>
31#include <linux/list.h>
32#include <net/sock.h>
33#include <net/tcp_states.h>
34#include <net/netfilter/nf_queue.h>
35#include <net/netns/generic.h>
36
37#include <linux/atomic.h>
38
39#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
40#include "../bridge/br_private.h"
41#endif
42
43#if IS_ENABLED(CONFIG_NF_CONNTRACK)
44#include <net/netfilter/nf_conntrack.h>
45#endif
46
47#define NFQNL_QMAX_DEFAULT 1024
48
49
50
51
52
53
54
55#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
56
57struct nfqnl_instance {
58 struct hlist_node hlist;
59 struct rcu_head rcu;
60
61 u32 peer_portid;
62 unsigned int queue_maxlen;
63 unsigned int copy_range;
64 unsigned int queue_dropped;
65 unsigned int queue_user_dropped;
66
67
68 u_int16_t queue_num;
69 u_int8_t copy_mode;
70 u_int32_t flags;
71
72
73
74
75 spinlock_t lock ____cacheline_aligned_in_smp;
76 unsigned int queue_total;
77 unsigned int id_sequence;
78 struct list_head queue_list;
79};
80
81typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
82
83static unsigned int nfnl_queue_net_id __read_mostly;
84
85#define INSTANCE_BUCKETS 16
86struct nfnl_queue_net {
87 spinlock_t instances_lock;
88 struct hlist_head instance_table[INSTANCE_BUCKETS];
89};
90
91static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
92{
93 return net_generic(net, nfnl_queue_net_id);
94}
95
96static inline u_int8_t instance_hashfn(u_int16_t queue_num)
97{
98 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
99}
100
101static struct nfqnl_instance *
102instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
103{
104 struct hlist_head *head;
105 struct nfqnl_instance *inst;
106
107 head = &q->instance_table[instance_hashfn(queue_num)];
108 hlist_for_each_entry_rcu(inst, head, hlist) {
109 if (inst->queue_num == queue_num)
110 return inst;
111 }
112 return NULL;
113}
114
115static struct nfqnl_instance *
116instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
117{
118 struct nfqnl_instance *inst;
119 unsigned int h;
120 int err;
121
122 spin_lock(&q->instances_lock);
123 if (instance_lookup(q, queue_num)) {
124 err = -EEXIST;
125 goto out_unlock;
126 }
127
128 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
129 if (!inst) {
130 err = -ENOMEM;
131 goto out_unlock;
132 }
133
134 inst->queue_num = queue_num;
135 inst->peer_portid = portid;
136 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
137 inst->copy_range = NFQNL_MAX_COPY_RANGE;
138 inst->copy_mode = NFQNL_COPY_NONE;
139 spin_lock_init(&inst->lock);
140 INIT_LIST_HEAD(&inst->queue_list);
141
142 if (!try_module_get(THIS_MODULE)) {
143 err = -EAGAIN;
144 goto out_free;
145 }
146
147 h = instance_hashfn(queue_num);
148 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
149
150 spin_unlock(&q->instances_lock);
151
152 return inst;
153
154out_free:
155 kfree(inst);
156out_unlock:
157 spin_unlock(&q->instances_lock);
158 return ERR_PTR(err);
159}
160
161static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
162 unsigned long data);
163
164static void
165instance_destroy_rcu(struct rcu_head *head)
166{
167 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
168 rcu);
169
170 nfqnl_flush(inst, NULL, 0);
171 kfree(inst);
172 module_put(THIS_MODULE);
173}
174
175static void
176__instance_destroy(struct nfqnl_instance *inst)
177{
178 hlist_del_rcu(&inst->hlist);
179 call_rcu(&inst->rcu, instance_destroy_rcu);
180}
181
182static void
183instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
184{
185 spin_lock(&q->instances_lock);
186 __instance_destroy(inst);
187 spin_unlock(&q->instances_lock);
188}
189
190static inline void
191__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
192{
193 list_add_tail(&entry->list, &queue->queue_list);
194 queue->queue_total++;
195}
196
197static void
198__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
199{
200 list_del(&entry->list);
201 queue->queue_total--;
202}
203
204static struct nf_queue_entry *
205find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
206{
207 struct nf_queue_entry *entry = NULL, *i;
208
209 spin_lock_bh(&queue->lock);
210
211 list_for_each_entry(i, &queue->queue_list, list) {
212 if (i->id == id) {
213 entry = i;
214 break;
215 }
216 }
217
218 if (entry)
219 __dequeue_entry(queue, entry);
220
221 spin_unlock_bh(&queue->lock);
222
223 return entry;
224}
225
226static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict)
227{
228 struct nf_ct_hook *ct_hook;
229 int err;
230
231 if (verdict == NF_ACCEPT ||
232 verdict == NF_REPEAT ||
233 verdict == NF_STOP) {
234 rcu_read_lock();
235 ct_hook = rcu_dereference(nf_ct_hook);
236 if (ct_hook) {
237 err = ct_hook->update(entry->state.net, entry->skb);
238 if (err < 0)
239 verdict = NF_DROP;
240 }
241 rcu_read_unlock();
242 }
243 nf_reinject(entry, verdict);
244}
245
246static void
247nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
248{
249 struct nf_queue_entry *entry, *next;
250
251 spin_lock_bh(&queue->lock);
252 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
253 if (!cmpfn || cmpfn(entry, data)) {
254 list_del(&entry->list);
255 queue->queue_total--;
256 nfqnl_reinject(entry, NF_DROP);
257 }
258 }
259 spin_unlock_bh(&queue->lock);
260}
261
262static int
263nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
264 bool csum_verify)
265{
266 __u32 flags = 0;
267
268 if (packet->ip_summed == CHECKSUM_PARTIAL)
269 flags = NFQA_SKB_CSUMNOTREADY;
270 else if (csum_verify)
271 flags = NFQA_SKB_CSUM_NOTVERIFIED;
272
273 if (skb_is_gso(packet))
274 flags |= NFQA_SKB_GSO;
275
276 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
277}
278
279static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
280{
281 const struct cred *cred;
282
283 if (!sk_fullsock(sk))
284 return 0;
285
286 read_lock_bh(&sk->sk_callback_lock);
287 if (sk->sk_socket && sk->sk_socket->file) {
288 cred = sk->sk_socket->file->f_cred;
289 if (nla_put_be32(skb, NFQA_UID,
290 htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
291 goto nla_put_failure;
292 if (nla_put_be32(skb, NFQA_GID,
293 htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
294 goto nla_put_failure;
295 }
296 read_unlock_bh(&sk->sk_callback_lock);
297 return 0;
298
299nla_put_failure:
300 read_unlock_bh(&sk->sk_callback_lock);
301 return -1;
302}
303
304static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
305{
306 u32 seclen = 0;
307#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
308 if (!skb || !sk_fullsock(skb->sk))
309 return 0;
310
311 read_lock_bh(&skb->sk->sk_callback_lock);
312
313 if (skb->secmark)
314 security_secid_to_secctx(skb->secmark, secdata, &seclen);
315
316 read_unlock_bh(&skb->sk->sk_callback_lock);
317#endif
318 return seclen;
319}
320
321static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
322{
323 struct sk_buff *entskb = entry->skb;
324 u32 nlalen = 0;
325
326 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
327 return 0;
328
329 if (skb_vlan_tag_present(entskb))
330 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
331 nla_total_size(sizeof(__be16)));
332
333 if (entskb->network_header > entskb->mac_header)
334 nlalen += nla_total_size((entskb->network_header -
335 entskb->mac_header));
336
337 return nlalen;
338}
339
340static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
341{
342 struct sk_buff *entskb = entry->skb;
343
344 if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
345 return 0;
346
347 if (skb_vlan_tag_present(entskb)) {
348 struct nlattr *nest;
349
350 nest = nla_nest_start(skb, NFQA_VLAN);
351 if (!nest)
352 goto nla_put_failure;
353
354 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
355 nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
356 goto nla_put_failure;
357
358 nla_nest_end(skb, nest);
359 }
360
361 if (entskb->mac_header < entskb->network_header) {
362 int len = (int)(entskb->network_header - entskb->mac_header);
363
364 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
365 goto nla_put_failure;
366 }
367
368 return 0;
369
370nla_put_failure:
371 return -1;
372}
373
374static struct sk_buff *
375nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
376 struct nf_queue_entry *entry,
377 __be32 **packet_id_ptr)
378{
379 size_t size;
380 size_t data_len = 0, cap_len = 0;
381 unsigned int hlen = 0;
382 struct sk_buff *skb;
383 struct nlattr *nla;
384 struct nfqnl_msg_packet_hdr *pmsg;
385 struct nlmsghdr *nlh;
386 struct sk_buff *entskb = entry->skb;
387 struct net_device *indev;
388 struct net_device *outdev;
389 struct nf_conn *ct = NULL;
390 enum ip_conntrack_info ctinfo;
391 struct nfnl_ct_hook *nfnl_ct;
392 bool csum_verify;
393 char *secdata = NULL;
394 u32 seclen = 0;
395
396 size = nlmsg_total_size(sizeof(struct nfgenmsg))
397 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
398 + nla_total_size(sizeof(u_int32_t))
399 + nla_total_size(sizeof(u_int32_t))
400#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
401 + nla_total_size(sizeof(u_int32_t))
402 + nla_total_size(sizeof(u_int32_t))
403#endif
404 + nla_total_size(sizeof(u_int32_t))
405 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
406 + nla_total_size(sizeof(u_int32_t))
407 + nla_total_size(sizeof(u_int32_t));
408
409 if (entskb->tstamp)
410 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
411
412 size += nfqnl_get_bridge_size(entry);
413
414 if (entry->state.hook <= NF_INET_FORWARD ||
415 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
416 csum_verify = !skb_csum_unnecessary(entskb);
417 else
418 csum_verify = false;
419
420 outdev = entry->state.out;
421
422 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) {
423 case NFQNL_COPY_META:
424 case NFQNL_COPY_NONE:
425 break;
426
427 case NFQNL_COPY_PACKET:
428 if (!(queue->flags & NFQA_CFG_F_GSO) &&
429 entskb->ip_summed == CHECKSUM_PARTIAL &&
430 skb_checksum_help(entskb))
431 return NULL;
432
433 data_len = READ_ONCE(queue->copy_range);
434 if (data_len > entskb->len)
435 data_len = entskb->len;
436
437 hlen = skb_zerocopy_headlen(entskb);
438 hlen = min_t(unsigned int, hlen, data_len);
439 size += sizeof(struct nlattr) + hlen;
440 cap_len = entskb->len;
441 break;
442 }
443
444 nfnl_ct = rcu_dereference(nfnl_ct_hook);
445
446#if IS_ENABLED(CONFIG_NF_CONNTRACK)
447 if (queue->flags & NFQA_CFG_F_CONNTRACK) {
448 if (nfnl_ct != NULL) {
449 ct = nf_ct_get(entskb, &ctinfo);
450 if (ct != NULL)
451 size += nfnl_ct->build_size(ct);
452 }
453 }
454#endif
455
456 if (queue->flags & NFQA_CFG_F_UID_GID) {
457 size += (nla_total_size(sizeof(u_int32_t))
458 + nla_total_size(sizeof(u_int32_t)));
459 }
460
461 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
462 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
463 if (seclen)
464 size += nla_total_size(seclen);
465 }
466
467 skb = alloc_skb(size, GFP_ATOMIC);
468 if (!skb) {
469 skb_tx_error(entskb);
470 goto nlmsg_failure;
471 }
472
473 nlh = nfnl_msg_put(skb, 0, 0,
474 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET),
475 0, entry->state.pf, NFNETLINK_V0,
476 htons(queue->queue_num));
477 if (!nlh) {
478 skb_tx_error(entskb);
479 kfree_skb(skb);
480 goto nlmsg_failure;
481 }
482
483 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
484 pmsg = nla_data(nla);
485 pmsg->hw_protocol = entskb->protocol;
486 pmsg->hook = entry->state.hook;
487 *packet_id_ptr = &pmsg->packet_id;
488
489 indev = entry->state.in;
490 if (indev) {
491#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
492 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
493 goto nla_put_failure;
494#else
495 if (entry->state.pf == PF_BRIDGE) {
496
497
498
499 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
500 htonl(indev->ifindex)) ||
501
502
503 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
504 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
505 goto nla_put_failure;
506 } else {
507 int physinif;
508
509
510
511 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
512 htonl(indev->ifindex)))
513 goto nla_put_failure;
514
515 physinif = nf_bridge_get_physinif(entskb);
516 if (physinif &&
517 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
518 htonl(physinif)))
519 goto nla_put_failure;
520 }
521#endif
522 }
523
524 if (outdev) {
525#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
526 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
527 goto nla_put_failure;
528#else
529 if (entry->state.pf == PF_BRIDGE) {
530
531
532
533 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
534 htonl(outdev->ifindex)) ||
535
536
537 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
538 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
539 goto nla_put_failure;
540 } else {
541 int physoutif;
542
543
544
545 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
546 htonl(outdev->ifindex)))
547 goto nla_put_failure;
548
549 physoutif = nf_bridge_get_physoutif(entskb);
550 if (physoutif &&
551 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
552 htonl(physoutif)))
553 goto nla_put_failure;
554 }
555#endif
556 }
557
558 if (entskb->mark &&
559 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
560 goto nla_put_failure;
561
562 if (indev && entskb->dev &&
563 entskb->mac_header != entskb->network_header) {
564 struct nfqnl_msg_packet_hw phw;
565 int len;
566
567 memset(&phw, 0, sizeof(phw));
568 len = dev_parse_header(entskb, phw.hw_addr);
569 if (len) {
570 phw.hw_addrlen = htons(len);
571 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
572 goto nla_put_failure;
573 }
574 }
575
576 if (nfqnl_put_bridge(entry, skb) < 0)
577 goto nla_put_failure;
578
579 if (entry->state.hook <= NF_INET_FORWARD && entskb->tstamp) {
580 struct nfqnl_msg_packet_timestamp ts;
581 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp);
582
583 ts.sec = cpu_to_be64(kts.tv_sec);
584 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
585
586 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
587 goto nla_put_failure;
588 }
589
590 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
591 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
592 goto nla_put_failure;
593
594 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
595 goto nla_put_failure;
596
597 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
598 goto nla_put_failure;
599
600 if (cap_len > data_len &&
601 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
602 goto nla_put_failure;
603
604 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
605 goto nla_put_failure;
606
607 if (data_len) {
608 struct nlattr *nla;
609
610 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
611 goto nla_put_failure;
612
613 nla = skb_put(skb, sizeof(*nla));
614 nla->nla_type = NFQA_PAYLOAD;
615 nla->nla_len = nla_attr_size(data_len);
616
617 if (skb_zerocopy(skb, entskb, data_len, hlen))
618 goto nla_put_failure;
619 }
620
621 nlh->nlmsg_len = skb->len;
622 if (seclen)
623 security_release_secctx(secdata, seclen);
624 return skb;
625
626nla_put_failure:
627 skb_tx_error(entskb);
628 kfree_skb(skb);
629 net_err_ratelimited("nf_queue: error creating packet message\n");
630nlmsg_failure:
631 if (seclen)
632 security_release_secctx(secdata, seclen);
633 return NULL;
634}
635
636static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry)
637{
638#if IS_ENABLED(CONFIG_NF_CONNTRACK)
639 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING;
640 const struct nf_conn *ct = (void *)skb_nfct(entry->skb);
641
642 if (ct && ((ct->status & flags) == IPS_DYING))
643 return true;
644#endif
645 return false;
646}
647
648static int
649__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
650 struct nf_queue_entry *entry)
651{
652 struct sk_buff *nskb;
653 int err = -ENOBUFS;
654 __be32 *packet_id_ptr;
655 int failopen = 0;
656
657 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
658 if (nskb == NULL) {
659 err = -ENOMEM;
660 goto err_out;
661 }
662 spin_lock_bh(&queue->lock);
663
664 if (nf_ct_drop_unconfirmed(entry))
665 goto err_out_free_nskb;
666
667 if (queue->queue_total >= queue->queue_maxlen) {
668 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
669 failopen = 1;
670 err = 0;
671 } else {
672 queue->queue_dropped++;
673 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
674 queue->queue_total);
675 }
676 goto err_out_free_nskb;
677 }
678 entry->id = ++queue->id_sequence;
679 *packet_id_ptr = htonl(entry->id);
680
681
682 err = nfnetlink_unicast(nskb, net, queue->peer_portid);
683 if (err < 0) {
684 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
685 failopen = 1;
686 err = 0;
687 } else {
688 queue->queue_user_dropped++;
689 }
690 goto err_out_unlock;
691 }
692
693 __enqueue_entry(queue, entry);
694
695 spin_unlock_bh(&queue->lock);
696 return 0;
697
698err_out_free_nskb:
699 kfree_skb(nskb);
700err_out_unlock:
701 spin_unlock_bh(&queue->lock);
702 if (failopen)
703 nfqnl_reinject(entry, NF_ACCEPT);
704err_out:
705 return err;
706}
707
708static struct nf_queue_entry *
709nf_queue_entry_dup(struct nf_queue_entry *e)
710{
711 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
712 if (entry)
713 nf_queue_entry_get_refs(entry);
714 return entry;
715}
716
717#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
718
719
720
721
722static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
723{
724 if (nf_bridge_info_get(skb))
725 __skb_push(skb, skb->network_header - skb->mac_header);
726}
727
728static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
729{
730 if (nf_bridge_info_get(skb))
731 __skb_pull(skb, skb->network_header - skb->mac_header);
732}
733#else
734#define nf_bridge_adjust_skb_data(s) do {} while (0)
735#define nf_bridge_adjust_segmented_data(s) do {} while (0)
736#endif
737
738static int
739__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
740 struct sk_buff *skb, struct nf_queue_entry *entry)
741{
742 int ret = -ENOMEM;
743 struct nf_queue_entry *entry_seg;
744
745 nf_bridge_adjust_segmented_data(skb);
746
747 if (skb->next == NULL) {
748 struct sk_buff *gso_skb = entry->skb;
749 entry->skb = skb;
750 ret = __nfqnl_enqueue_packet(net, queue, entry);
751 if (ret)
752 entry->skb = gso_skb;
753 return ret;
754 }
755
756 skb_mark_not_on_list(skb);
757
758 entry_seg = nf_queue_entry_dup(entry);
759 if (entry_seg) {
760 entry_seg->skb = skb;
761 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
762 if (ret)
763 nf_queue_entry_free(entry_seg);
764 }
765 return ret;
766}
767
768static int
769nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
770{
771 unsigned int queued;
772 struct nfqnl_instance *queue;
773 struct sk_buff *skb, *segs, *nskb;
774 int err = -ENOBUFS;
775 struct net *net = entry->state.net;
776 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
777
778
779 queue = instance_lookup(q, queuenum);
780 if (!queue)
781 return -ESRCH;
782
783 if (queue->copy_mode == NFQNL_COPY_NONE)
784 return -EINVAL;
785
786 skb = entry->skb;
787
788 switch (entry->state.pf) {
789 case NFPROTO_IPV4:
790 skb->protocol = htons(ETH_P_IP);
791 break;
792 case NFPROTO_IPV6:
793 skb->protocol = htons(ETH_P_IPV6);
794 break;
795 }
796
797 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
798 return __nfqnl_enqueue_packet(net, queue, entry);
799
800 nf_bridge_adjust_skb_data(skb);
801 segs = skb_gso_segment(skb, 0);
802
803
804
805
806 if (IS_ERR_OR_NULL(segs))
807 goto out_err;
808 queued = 0;
809 err = 0;
810 skb_list_walk_safe(segs, segs, nskb) {
811 if (err == 0)
812 err = __nfqnl_enqueue_packet_gso(net, queue,
813 segs, entry);
814 if (err == 0)
815 queued++;
816 else
817 kfree_skb(segs);
818 }
819
820 if (queued) {
821 if (err)
822 nf_queue_entry_free(entry);
823 kfree_skb(skb);
824 return 0;
825 }
826 out_err:
827 nf_bridge_adjust_segmented_data(skb);
828 return err;
829}
830
831static int
832nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
833{
834 struct sk_buff *nskb;
835
836 if (diff < 0) {
837 if (pskb_trim(e->skb, data_len))
838 return -ENOMEM;
839 } else if (diff > 0) {
840 if (data_len > 0xFFFF)
841 return -EINVAL;
842 if (diff > skb_tailroom(e->skb)) {
843 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
844 diff, GFP_ATOMIC);
845 if (!nskb)
846 return -ENOMEM;
847 kfree_skb(e->skb);
848 e->skb = nskb;
849 }
850 skb_put(e->skb, diff);
851 }
852 if (skb_ensure_writable(e->skb, data_len))
853 return -ENOMEM;
854 skb_copy_to_linear_data(e->skb, data, data_len);
855 e->skb->ip_summed = CHECKSUM_NONE;
856 return 0;
857}
858
859static int
860nfqnl_set_mode(struct nfqnl_instance *queue,
861 unsigned char mode, unsigned int range)
862{
863 int status = 0;
864
865 spin_lock_bh(&queue->lock);
866 switch (mode) {
867 case NFQNL_COPY_NONE:
868 case NFQNL_COPY_META:
869 queue->copy_mode = mode;
870 queue->copy_range = 0;
871 break;
872
873 case NFQNL_COPY_PACKET:
874 queue->copy_mode = mode;
875 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
876 queue->copy_range = NFQNL_MAX_COPY_RANGE;
877 else
878 queue->copy_range = range;
879 break;
880
881 default:
882 status = -EINVAL;
883
884 }
885 spin_unlock_bh(&queue->lock);
886
887 return status;
888}
889
890static int
891dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
892{
893#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
894 int physinif, physoutif;
895
896 physinif = nf_bridge_get_physinif(entry->skb);
897 physoutif = nf_bridge_get_physoutif(entry->skb);
898
899 if (physinif == ifindex || physoutif == ifindex)
900 return 1;
901#endif
902 if (entry->state.in)
903 if (entry->state.in->ifindex == ifindex)
904 return 1;
905 if (entry->state.out)
906 if (entry->state.out->ifindex == ifindex)
907 return 1;
908
909 return 0;
910}
911
912
913
914static void
915nfqnl_dev_drop(struct net *net, int ifindex)
916{
917 int i;
918 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
919
920 rcu_read_lock();
921
922 for (i = 0; i < INSTANCE_BUCKETS; i++) {
923 struct nfqnl_instance *inst;
924 struct hlist_head *head = &q->instance_table[i];
925
926 hlist_for_each_entry_rcu(inst, head, hlist)
927 nfqnl_flush(inst, dev_cmp, ifindex);
928 }
929
930 rcu_read_unlock();
931}
932
933static int
934nfqnl_rcv_dev_event(struct notifier_block *this,
935 unsigned long event, void *ptr)
936{
937 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
938
939
940 if (event == NETDEV_DOWN)
941 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
942 return NOTIFY_DONE;
943}
944
945static struct notifier_block nfqnl_dev_notifier = {
946 .notifier_call = nfqnl_rcv_dev_event,
947};
948
949static void nfqnl_nf_hook_drop(struct net *net)
950{
951 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
952 int i;
953
954 for (i = 0; i < INSTANCE_BUCKETS; i++) {
955 struct nfqnl_instance *inst;
956 struct hlist_head *head = &q->instance_table[i];
957
958 hlist_for_each_entry_rcu(inst, head, hlist)
959 nfqnl_flush(inst, NULL, 0);
960 }
961}
962
963static int
964nfqnl_rcv_nl_event(struct notifier_block *this,
965 unsigned long event, void *ptr)
966{
967 struct netlink_notify *n = ptr;
968 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
969
970 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
971 int i;
972
973
974 spin_lock(&q->instances_lock);
975 for (i = 0; i < INSTANCE_BUCKETS; i++) {
976 struct hlist_node *t2;
977 struct nfqnl_instance *inst;
978 struct hlist_head *head = &q->instance_table[i];
979
980 hlist_for_each_entry_safe(inst, t2, head, hlist) {
981 if (n->portid == inst->peer_portid)
982 __instance_destroy(inst);
983 }
984 }
985 spin_unlock(&q->instances_lock);
986 }
987 return NOTIFY_DONE;
988}
989
990static struct notifier_block nfqnl_rtnl_notifier = {
991 .notifier_call = nfqnl_rcv_nl_event,
992};
993
994static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
995 [NFQA_VLAN_TCI] = { .type = NLA_U16},
996 [NFQA_VLAN_PROTO] = { .type = NLA_U16},
997};
998
999static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
1000 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1001 [NFQA_MARK] = { .type = NLA_U32 },
1002 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
1003 [NFQA_CT] = { .type = NLA_UNSPEC },
1004 [NFQA_EXP] = { .type = NLA_UNSPEC },
1005 [NFQA_VLAN] = { .type = NLA_NESTED },
1006};
1007
1008static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
1009 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1010 [NFQA_MARK] = { .type = NLA_U32 },
1011};
1012
1013static struct nfqnl_instance *
1014verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
1015{
1016 struct nfqnl_instance *queue;
1017
1018 queue = instance_lookup(q, queue_num);
1019 if (!queue)
1020 return ERR_PTR(-ENODEV);
1021
1022 if (queue->peer_portid != nlportid)
1023 return ERR_PTR(-EPERM);
1024
1025 return queue;
1026}
1027
1028static struct nfqnl_msg_verdict_hdr*
1029verdicthdr_get(const struct nlattr * const nfqa[])
1030{
1031 struct nfqnl_msg_verdict_hdr *vhdr;
1032 unsigned int verdict;
1033
1034 if (!nfqa[NFQA_VERDICT_HDR])
1035 return NULL;
1036
1037 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
1038 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
1039 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
1040 return NULL;
1041 return vhdr;
1042}
1043
1044static int nfq_id_after(unsigned int id, unsigned int max)
1045{
1046 return (int)(id - max) > 0;
1047}
1048
1049static int nfqnl_recv_verdict_batch(struct sk_buff *skb,
1050 const struct nfnl_info *info,
1051 const struct nlattr * const nfqa[])
1052{
1053 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1054 struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1055 u16 queue_num = ntohs(nfmsg->res_id);
1056 struct nf_queue_entry *entry, *tmp;
1057 struct nfqnl_msg_verdict_hdr *vhdr;
1058 struct nfqnl_instance *queue;
1059 unsigned int verdict, maxid;
1060 LIST_HEAD(batch_list);
1061
1062 queue = verdict_instance_lookup(q, queue_num,
1063 NETLINK_CB(skb).portid);
1064 if (IS_ERR(queue))
1065 return PTR_ERR(queue);
1066
1067 vhdr = verdicthdr_get(nfqa);
1068 if (!vhdr)
1069 return -EINVAL;
1070
1071 verdict = ntohl(vhdr->verdict);
1072 maxid = ntohl(vhdr->id);
1073
1074 spin_lock_bh(&queue->lock);
1075
1076 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
1077 if (nfq_id_after(entry->id, maxid))
1078 break;
1079 __dequeue_entry(queue, entry);
1080 list_add_tail(&entry->list, &batch_list);
1081 }
1082
1083 spin_unlock_bh(&queue->lock);
1084
1085 if (list_empty(&batch_list))
1086 return -ENOENT;
1087
1088 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1089 if (nfqa[NFQA_MARK])
1090 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1091
1092 nfqnl_reinject(entry, verdict);
1093 }
1094 return 0;
1095}
1096
1097static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
1098 const struct nlmsghdr *nlh,
1099 const struct nlattr * const nfqa[],
1100 struct nf_queue_entry *entry,
1101 enum ip_conntrack_info *ctinfo)
1102{
1103#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1104 struct nf_conn *ct;
1105
1106 ct = nf_ct_get(entry->skb, ctinfo);
1107 if (ct == NULL)
1108 return NULL;
1109
1110 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1111 return NULL;
1112
1113 if (nfqa[NFQA_EXP])
1114 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1115 NETLINK_CB(entry->skb).portid,
1116 nlmsg_report(nlh));
1117 return ct;
1118#else
1119 return NULL;
1120#endif
1121}
1122
1123static int nfqa_parse_bridge(struct nf_queue_entry *entry,
1124 const struct nlattr * const nfqa[])
1125{
1126 if (nfqa[NFQA_VLAN]) {
1127 struct nlattr *tb[NFQA_VLAN_MAX + 1];
1128 int err;
1129
1130 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX,
1131 nfqa[NFQA_VLAN],
1132 nfqa_vlan_policy, NULL);
1133 if (err < 0)
1134 return err;
1135
1136 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
1137 return -EINVAL;
1138
1139 __vlan_hwaccel_put_tag(entry->skb,
1140 nla_get_be16(tb[NFQA_VLAN_PROTO]),
1141 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])));
1142 }
1143
1144 if (nfqa[NFQA_L2HDR]) {
1145 int mac_header_len = entry->skb->network_header -
1146 entry->skb->mac_header;
1147
1148 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
1149 return -EINVAL;
1150 else if (mac_header_len > 0)
1151 memcpy(skb_mac_header(entry->skb),
1152 nla_data(nfqa[NFQA_L2HDR]),
1153 mac_header_len);
1154 }
1155
1156 return 0;
1157}
1158
1159static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
1160 const struct nlattr * const nfqa[])
1161{
1162 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1163 struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1164 u_int16_t queue_num = ntohs(nfmsg->res_id);
1165 struct nfqnl_msg_verdict_hdr *vhdr;
1166 enum ip_conntrack_info ctinfo;
1167 struct nfqnl_instance *queue;
1168 struct nf_queue_entry *entry;
1169 struct nfnl_ct_hook *nfnl_ct;
1170 struct nf_conn *ct = NULL;
1171 unsigned int verdict;
1172 int err;
1173
1174 queue = verdict_instance_lookup(q, queue_num,
1175 NETLINK_CB(skb).portid);
1176 if (IS_ERR(queue))
1177 return PTR_ERR(queue);
1178
1179 vhdr = verdicthdr_get(nfqa);
1180 if (!vhdr)
1181 return -EINVAL;
1182
1183 verdict = ntohl(vhdr->verdict);
1184
1185 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1186 if (entry == NULL)
1187 return -ENOENT;
1188
1189
1190 nfnl_ct = rcu_dereference(nfnl_ct_hook);
1191
1192 if (nfqa[NFQA_CT]) {
1193 if (nfnl_ct != NULL)
1194 ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry,
1195 &ctinfo);
1196 }
1197
1198 if (entry->state.pf == PF_BRIDGE) {
1199 err = nfqa_parse_bridge(entry, nfqa);
1200 if (err < 0)
1201 return err;
1202 }
1203
1204 if (nfqa[NFQA_PAYLOAD]) {
1205 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1206 int diff = payload_len - entry->skb->len;
1207
1208 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1209 payload_len, entry, diff) < 0)
1210 verdict = NF_DROP;
1211
1212 if (ct && diff)
1213 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1214 }
1215
1216 if (nfqa[NFQA_MARK])
1217 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1218
1219 nfqnl_reinject(entry, verdict);
1220 return 0;
1221}
1222
1223static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info,
1224 const struct nlattr * const cda[])
1225{
1226 return -ENOTSUPP;
1227}
1228
1229static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1230 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1231 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1232 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 },
1233 [NFQA_CFG_MASK] = { .type = NLA_U32 },
1234 [NFQA_CFG_FLAGS] = { .type = NLA_U32 },
1235};
1236
1237static const struct nf_queue_handler nfqh = {
1238 .outfn = nfqnl_enqueue_packet,
1239 .nf_hook_drop = nfqnl_nf_hook_drop,
1240};
1241
1242static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info,
1243 const struct nlattr * const nfqa[])
1244{
1245 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1246 struct nfgenmsg *nfmsg = nlmsg_data(info->nlh);
1247 u_int16_t queue_num = ntohs(nfmsg->res_id);
1248 struct nfqnl_msg_config_cmd *cmd = NULL;
1249 struct nfqnl_instance *queue;
1250 __u32 flags = 0, mask = 0;
1251 int ret = 0;
1252
1253 if (nfqa[NFQA_CFG_CMD]) {
1254 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1255
1256
1257 switch (cmd->command) {
1258 case NFQNL_CFG_CMD_PF_BIND: return 0;
1259 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1260 }
1261 }
1262
1263
1264
1265
1266 if (nfqa[NFQA_CFG_FLAGS]) {
1267 if (!nfqa[NFQA_CFG_MASK]) {
1268
1269
1270
1271 return -EINVAL;
1272 }
1273
1274 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1275 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1276
1277 if (flags >= NFQA_CFG_F_MAX)
1278 return -EOPNOTSUPP;
1279
1280#if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1281 if (flags & mask & NFQA_CFG_F_SECCTX)
1282 return -EOPNOTSUPP;
1283#endif
1284 if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
1285 !rcu_access_pointer(nfnl_ct_hook)) {
1286#ifdef CONFIG_MODULES
1287 nfnl_unlock(NFNL_SUBSYS_QUEUE);
1288 request_module("ip_conntrack_netlink");
1289 nfnl_lock(NFNL_SUBSYS_QUEUE);
1290 if (rcu_access_pointer(nfnl_ct_hook))
1291 return -EAGAIN;
1292#endif
1293 return -EOPNOTSUPP;
1294 }
1295 }
1296
1297 rcu_read_lock();
1298 queue = instance_lookup(q, queue_num);
1299 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1300 ret = -EPERM;
1301 goto err_out_unlock;
1302 }
1303
1304 if (cmd != NULL) {
1305 switch (cmd->command) {
1306 case NFQNL_CFG_CMD_BIND:
1307 if (queue) {
1308 ret = -EBUSY;
1309 goto err_out_unlock;
1310 }
1311 queue = instance_create(q, queue_num,
1312 NETLINK_CB(skb).portid);
1313 if (IS_ERR(queue)) {
1314 ret = PTR_ERR(queue);
1315 goto err_out_unlock;
1316 }
1317 break;
1318 case NFQNL_CFG_CMD_UNBIND:
1319 if (!queue) {
1320 ret = -ENODEV;
1321 goto err_out_unlock;
1322 }
1323 instance_destroy(q, queue);
1324 goto err_out_unlock;
1325 case NFQNL_CFG_CMD_PF_BIND:
1326 case NFQNL_CFG_CMD_PF_UNBIND:
1327 break;
1328 default:
1329 ret = -ENOTSUPP;
1330 goto err_out_unlock;
1331 }
1332 }
1333
1334 if (!queue) {
1335 ret = -ENODEV;
1336 goto err_out_unlock;
1337 }
1338
1339 if (nfqa[NFQA_CFG_PARAMS]) {
1340 struct nfqnl_msg_config_params *params =
1341 nla_data(nfqa[NFQA_CFG_PARAMS]);
1342
1343 nfqnl_set_mode(queue, params->copy_mode,
1344 ntohl(params->copy_range));
1345 }
1346
1347 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1348 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1349
1350 spin_lock_bh(&queue->lock);
1351 queue->queue_maxlen = ntohl(*queue_maxlen);
1352 spin_unlock_bh(&queue->lock);
1353 }
1354
1355 if (nfqa[NFQA_CFG_FLAGS]) {
1356 spin_lock_bh(&queue->lock);
1357 queue->flags &= ~mask;
1358 queue->flags |= flags & mask;
1359 spin_unlock_bh(&queue->lock);
1360 }
1361
1362err_out_unlock:
1363 rcu_read_unlock();
1364 return ret;
1365}
1366
1367static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1368 [NFQNL_MSG_PACKET] = {
1369 .call = nfqnl_recv_unsupp,
1370 .type = NFNL_CB_RCU,
1371 .attr_count = NFQA_MAX,
1372 },
1373 [NFQNL_MSG_VERDICT] = {
1374 .call = nfqnl_recv_verdict,
1375 .type = NFNL_CB_RCU,
1376 .attr_count = NFQA_MAX,
1377 .policy = nfqa_verdict_policy
1378 },
1379 [NFQNL_MSG_CONFIG] = {
1380 .call = nfqnl_recv_config,
1381 .type = NFNL_CB_MUTEX,
1382 .attr_count = NFQA_CFG_MAX,
1383 .policy = nfqa_cfg_policy
1384 },
1385 [NFQNL_MSG_VERDICT_BATCH] = {
1386 .call = nfqnl_recv_verdict_batch,
1387 .type = NFNL_CB_RCU,
1388 .attr_count = NFQA_MAX,
1389 .policy = nfqa_verdict_batch_policy
1390 },
1391};
1392
1393static const struct nfnetlink_subsystem nfqnl_subsys = {
1394 .name = "nf_queue",
1395 .subsys_id = NFNL_SUBSYS_QUEUE,
1396 .cb_count = NFQNL_MSG_MAX,
1397 .cb = nfqnl_cb,
1398};
1399
1400#ifdef CONFIG_PROC_FS
1401struct iter_state {
1402 struct seq_net_private p;
1403 unsigned int bucket;
1404};
1405
1406static struct hlist_node *get_first(struct seq_file *seq)
1407{
1408 struct iter_state *st = seq->private;
1409 struct net *net;
1410 struct nfnl_queue_net *q;
1411
1412 if (!st)
1413 return NULL;
1414
1415 net = seq_file_net(seq);
1416 q = nfnl_queue_pernet(net);
1417 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1418 if (!hlist_empty(&q->instance_table[st->bucket]))
1419 return q->instance_table[st->bucket].first;
1420 }
1421 return NULL;
1422}
1423
1424static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1425{
1426 struct iter_state *st = seq->private;
1427 struct net *net = seq_file_net(seq);
1428
1429 h = h->next;
1430 while (!h) {
1431 struct nfnl_queue_net *q;
1432
1433 if (++st->bucket >= INSTANCE_BUCKETS)
1434 return NULL;
1435
1436 q = nfnl_queue_pernet(net);
1437 h = q->instance_table[st->bucket].first;
1438 }
1439 return h;
1440}
1441
1442static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1443{
1444 struct hlist_node *head;
1445 head = get_first(seq);
1446
1447 if (head)
1448 while (pos && (head = get_next(seq, head)))
1449 pos--;
1450 return pos ? NULL : head;
1451}
1452
1453static void *seq_start(struct seq_file *s, loff_t *pos)
1454 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1455{
1456 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1457 return get_idx(s, *pos);
1458}
1459
1460static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1461{
1462 (*pos)++;
1463 return get_next(s, v);
1464}
1465
1466static void seq_stop(struct seq_file *s, void *v)
1467 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1468{
1469 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1470}
1471
1472static int seq_show(struct seq_file *s, void *v)
1473{
1474 const struct nfqnl_instance *inst = v;
1475
1476 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1477 inst->queue_num,
1478 inst->peer_portid, inst->queue_total,
1479 inst->copy_mode, inst->copy_range,
1480 inst->queue_dropped, inst->queue_user_dropped,
1481 inst->id_sequence, 1);
1482 return 0;
1483}
1484
1485static const struct seq_operations nfqnl_seq_ops = {
1486 .start = seq_start,
1487 .next = seq_next,
1488 .stop = seq_stop,
1489 .show = seq_show,
1490};
1491#endif
1492
1493static int __net_init nfnl_queue_net_init(struct net *net)
1494{
1495 unsigned int i;
1496 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1497
1498 for (i = 0; i < INSTANCE_BUCKETS; i++)
1499 INIT_HLIST_HEAD(&q->instance_table[i]);
1500
1501 spin_lock_init(&q->instances_lock);
1502
1503#ifdef CONFIG_PROC_FS
1504 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter,
1505 &nfqnl_seq_ops, sizeof(struct iter_state)))
1506 return -ENOMEM;
1507#endif
1508 nf_register_queue_handler(net, &nfqh);
1509 return 0;
1510}
1511
1512static void __net_exit nfnl_queue_net_exit(struct net *net)
1513{
1514 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1515 unsigned int i;
1516
1517 nf_unregister_queue_handler(net);
1518#ifdef CONFIG_PROC_FS
1519 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1520#endif
1521 for (i = 0; i < INSTANCE_BUCKETS; i++)
1522 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i]));
1523}
1524
1525static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
1526{
1527 synchronize_rcu();
1528}
1529
1530static struct pernet_operations nfnl_queue_net_ops = {
1531 .init = nfnl_queue_net_init,
1532 .exit = nfnl_queue_net_exit,
1533 .exit_batch = nfnl_queue_net_exit_batch,
1534 .id = &nfnl_queue_net_id,
1535 .size = sizeof(struct nfnl_queue_net),
1536};
1537
1538static int __init nfnetlink_queue_init(void)
1539{
1540 int status;
1541
1542 status = register_pernet_subsys(&nfnl_queue_net_ops);
1543 if (status < 0) {
1544 pr_err("failed to register pernet ops\n");
1545 goto out;
1546 }
1547
1548 netlink_register_notifier(&nfqnl_rtnl_notifier);
1549 status = nfnetlink_subsys_register(&nfqnl_subsys);
1550 if (status < 0) {
1551 pr_err("failed to create netlink socket\n");
1552 goto cleanup_netlink_notifier;
1553 }
1554
1555 status = register_netdevice_notifier(&nfqnl_dev_notifier);
1556 if (status < 0) {
1557 pr_err("failed to register netdevice notifier\n");
1558 goto cleanup_netlink_subsys;
1559 }
1560
1561 return status;
1562
1563cleanup_netlink_subsys:
1564 nfnetlink_subsys_unregister(&nfqnl_subsys);
1565cleanup_netlink_notifier:
1566 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1567 unregister_pernet_subsys(&nfnl_queue_net_ops);
1568out:
1569 return status;
1570}
1571
1572static void __exit nfnetlink_queue_fini(void)
1573{
1574 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1575 nfnetlink_subsys_unregister(&nfqnl_subsys);
1576 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1577 unregister_pernet_subsys(&nfnl_queue_net_ops);
1578
1579 rcu_barrier();
1580}
1581
1582MODULE_DESCRIPTION("netfilter packet queue handler");
1583MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1584MODULE_LICENSE("GPL");
1585MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1586
1587module_init(nfnetlink_queue_init);
1588module_exit(nfnetlink_queue_fini);
1589
