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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[people/ms/linux.git] / net / netfilter / nfnetlink_queue.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This is a module which is used for queueing packets and communicating with
4 * userspace via nfnetlink.
5 *
6 * (C) 2005 by Harald Welte <laforge@netfilter.org>
7 * (C) 2007 by Patrick McHardy <kaber@trash.net>
8 *
9 * Based on the old ipv4-only ip_queue.c:
10 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
11 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
12 */
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 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
50 * includes the header length. Thus, the maximum packet length that we
51 * support is 65531 bytes. We send truncated packets if the specified length
52 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
53 * attribute to detect truncation.
54 */
55 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
56
57 struct nfqnl_instance {
58 struct hlist_node hlist; /* global list of queues */
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; /* number of this queue */
69 u_int8_t copy_mode;
70 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
71 /*
72 * Following fields are dirtied for each queued packet,
73 * keep them in same cache line if possible.
74 */
75 spinlock_t lock ____cacheline_aligned_in_smp;
76 unsigned int queue_total;
77 unsigned int id_sequence; /* 'sequence' of pkt ids */
78 struct list_head queue_list; /* packets in queue */
79 };
80
81 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
82
83 static unsigned int nfnl_queue_net_id __read_mostly;
84
85 #define INSTANCE_BUCKETS 16
86 struct nfnl_queue_net {
87 spinlock_t instances_lock;
88 struct hlist_head instance_table[INSTANCE_BUCKETS];
89 };
90
91 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
92 {
93 return net_generic(net, nfnl_queue_net_id);
94 }
95
96 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
97 {
98 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
99 }
100
101 static struct nfqnl_instance *
102 instance_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
115 static struct nfqnl_instance *
116 instance_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
154 out_free:
155 kfree(inst);
156 out_unlock:
157 spin_unlock(&q->instances_lock);
158 return ERR_PTR(err);
159 }
160
161 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
162 unsigned long data);
163
164 static void
165 instance_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
175 static 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
182 static void
183 instance_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
190 static 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
197 static 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
204 static struct nf_queue_entry *
205 find_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
226 static 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
246 static void
247 nfqnl_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
262 static int
263 nfqnl_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
279 static 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
299 nla_put_failure:
300 read_unlock_bh(&sk->sk_callback_lock);
301 return -1;
302 }
303
304 static 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
321 static 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
340 static 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
370 nla_put_failure:
371 return -1;
372 }
373
374 static struct sk_buff *
375 nfqnl_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)) /* ifindex */
399 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
400 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
401 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
403 #endif
404 + nla_total_size(sizeof(u_int32_t)) /* mark */
405 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
406 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
407 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
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)) /* uid */
458 + nla_total_size(sizeof(u_int32_t))); /* gid */
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 /* Case 1: indev is physical input device, we need to
497 * look for bridge group (when called from
498 * netfilter_bridge) */
499 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
500 htonl(indev->ifindex)) ||
501 /* this is the bridge group "brX" */
502 /* rcu_read_lock()ed by __nf_queue */
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 /* Case 2: indev is bridge group, we need to look for
510 * physical device (when called from ipv4) */
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 /* Case 1: outdev is physical output device, we need to
531 * look for bridge group (when called from
532 * netfilter_bridge) */
533 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
534 htonl(outdev->ifindex)) ||
535 /* this is the bridge group "brX" */
536 /* rcu_read_lock()ed by __nf_queue */
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 /* Case 2: outdev is bridge group, we need to look for
544 * physical output device (when called from ipv4) */
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
626 nla_put_failure:
627 skb_tx_error(entskb);
628 kfree_skb(skb);
629 net_err_ratelimited("nf_queue: error creating packet message\n");
630 nlmsg_failure:
631 if (seclen)
632 security_release_secctx(secdata, seclen);
633 return NULL;
634 }
635
636 static 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
648 static 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 /* nfnetlink_unicast will either free the nskb or add it to a socket */
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
698 err_out_free_nskb:
699 kfree_skb(nskb);
700 err_out_unlock:
701 spin_unlock_bh(&queue->lock);
702 if (failopen)
703 nfqnl_reinject(entry, NF_ACCEPT);
704 err_out:
705 return err;
706 }
707
708 static struct nf_queue_entry *
709 nf_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 /* When called from bridge netfilter, skb->data must point to MAC header
719 * before calling skb_gso_segment(). Else, original MAC header is lost
720 * and segmented skbs will be sent to wrong destination.
721 */
722 static 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
728 static 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
738 static 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) { /* last packet, no need to copy entry */
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
768 static int
769 nfqnl_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 /* rcu_read_lock()ed by nf_hook_thresh */
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 /* Does not use PTR_ERR to limit the number of error codes that can be
803 * returned by nf_queue. For instance, callers rely on -ESRCH to
804 * mean 'ignore this hook'.
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) /* some segments are already queued */
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
831 static int
832 nfqnl_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
859 static int
860 nfqnl_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
890 static int
891 dev_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 /* drop all packets with either indev or outdev == ifindex from all queue
913 * instances */
914 static void
915 nfqnl_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
933 static int
934 nfqnl_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 /* Drop any packets associated with the downed device */
940 if (event == NETDEV_DOWN)
941 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
942 return NOTIFY_DONE;
943 }
944
945 static struct notifier_block nfqnl_dev_notifier = {
946 .notifier_call = nfqnl_rcv_dev_event,
947 };
948
949 static void nfqnl_nf_hook_drop(struct net *net)
950 {
951 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
952 int i;
953
954 /* This function is also called on net namespace error unwind,
955 * when pernet_ops->init() failed and ->exit() functions of the
956 * previous pernet_ops gets called.
957 *
958 * This may result in a call to nfqnl_nf_hook_drop() before
959 * struct nfnl_queue_net was allocated.
960 */
961 if (!q)
962 return;
963
964 for (i = 0; i < INSTANCE_BUCKETS; i++) {
965 struct nfqnl_instance *inst;
966 struct hlist_head *head = &q->instance_table[i];
967
968 hlist_for_each_entry_rcu(inst, head, hlist)
969 nfqnl_flush(inst, NULL, 0);
970 }
971 }
972
973 static int
974 nfqnl_rcv_nl_event(struct notifier_block *this,
975 unsigned long event, void *ptr)
976 {
977 struct netlink_notify *n = ptr;
978 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
979
980 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
981 int i;
982
983 /* destroy all instances for this portid */
984 spin_lock(&q->instances_lock);
985 for (i = 0; i < INSTANCE_BUCKETS; i++) {
986 struct hlist_node *t2;
987 struct nfqnl_instance *inst;
988 struct hlist_head *head = &q->instance_table[i];
989
990 hlist_for_each_entry_safe(inst, t2, head, hlist) {
991 if (n->portid == inst->peer_portid)
992 __instance_destroy(inst);
993 }
994 }
995 spin_unlock(&q->instances_lock);
996 }
997 return NOTIFY_DONE;
998 }
999
1000 static struct notifier_block nfqnl_rtnl_notifier = {
1001 .notifier_call = nfqnl_rcv_nl_event,
1002 };
1003
1004 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
1005 [NFQA_VLAN_TCI] = { .type = NLA_U16},
1006 [NFQA_VLAN_PROTO] = { .type = NLA_U16},
1007 };
1008
1009 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
1010 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1011 [NFQA_MARK] = { .type = NLA_U32 },
1012 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
1013 [NFQA_CT] = { .type = NLA_UNSPEC },
1014 [NFQA_EXP] = { .type = NLA_UNSPEC },
1015 [NFQA_VLAN] = { .type = NLA_NESTED },
1016 };
1017
1018 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
1019 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1020 [NFQA_MARK] = { .type = NLA_U32 },
1021 };
1022
1023 static struct nfqnl_instance *
1024 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
1025 {
1026 struct nfqnl_instance *queue;
1027
1028 queue = instance_lookup(q, queue_num);
1029 if (!queue)
1030 return ERR_PTR(-ENODEV);
1031
1032 if (queue->peer_portid != nlportid)
1033 return ERR_PTR(-EPERM);
1034
1035 return queue;
1036 }
1037
1038 static struct nfqnl_msg_verdict_hdr*
1039 verdicthdr_get(const struct nlattr * const nfqa[])
1040 {
1041 struct nfqnl_msg_verdict_hdr *vhdr;
1042 unsigned int verdict;
1043
1044 if (!nfqa[NFQA_VERDICT_HDR])
1045 return NULL;
1046
1047 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
1048 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
1049 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
1050 return NULL;
1051 return vhdr;
1052 }
1053
1054 static int nfq_id_after(unsigned int id, unsigned int max)
1055 {
1056 return (int)(id - max) > 0;
1057 }
1058
1059 static int nfqnl_recv_verdict_batch(struct sk_buff *skb,
1060 const struct nfnl_info *info,
1061 const struct nlattr * const nfqa[])
1062 {
1063 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1064 u16 queue_num = ntohs(info->nfmsg->res_id);
1065 struct nf_queue_entry *entry, *tmp;
1066 struct nfqnl_msg_verdict_hdr *vhdr;
1067 struct nfqnl_instance *queue;
1068 unsigned int verdict, maxid;
1069 LIST_HEAD(batch_list);
1070
1071 queue = verdict_instance_lookup(q, queue_num,
1072 NETLINK_CB(skb).portid);
1073 if (IS_ERR(queue))
1074 return PTR_ERR(queue);
1075
1076 vhdr = verdicthdr_get(nfqa);
1077 if (!vhdr)
1078 return -EINVAL;
1079
1080 verdict = ntohl(vhdr->verdict);
1081 maxid = ntohl(vhdr->id);
1082
1083 spin_lock_bh(&queue->lock);
1084
1085 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
1086 if (nfq_id_after(entry->id, maxid))
1087 break;
1088 __dequeue_entry(queue, entry);
1089 list_add_tail(&entry->list, &batch_list);
1090 }
1091
1092 spin_unlock_bh(&queue->lock);
1093
1094 if (list_empty(&batch_list))
1095 return -ENOENT;
1096
1097 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1098 if (nfqa[NFQA_MARK])
1099 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1100
1101 nfqnl_reinject(entry, verdict);
1102 }
1103 return 0;
1104 }
1105
1106 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
1107 const struct nlmsghdr *nlh,
1108 const struct nlattr * const nfqa[],
1109 struct nf_queue_entry *entry,
1110 enum ip_conntrack_info *ctinfo)
1111 {
1112 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1113 struct nf_conn *ct;
1114
1115 ct = nf_ct_get(entry->skb, ctinfo);
1116 if (ct == NULL)
1117 return NULL;
1118
1119 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1120 return NULL;
1121
1122 if (nfqa[NFQA_EXP])
1123 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1124 NETLINK_CB(entry->skb).portid,
1125 nlmsg_report(nlh));
1126 return ct;
1127 #else
1128 return NULL;
1129 #endif
1130 }
1131
1132 static int nfqa_parse_bridge(struct nf_queue_entry *entry,
1133 const struct nlattr * const nfqa[])
1134 {
1135 if (nfqa[NFQA_VLAN]) {
1136 struct nlattr *tb[NFQA_VLAN_MAX + 1];
1137 int err;
1138
1139 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX,
1140 nfqa[NFQA_VLAN],
1141 nfqa_vlan_policy, NULL);
1142 if (err < 0)
1143 return err;
1144
1145 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
1146 return -EINVAL;
1147
1148 __vlan_hwaccel_put_tag(entry->skb,
1149 nla_get_be16(tb[NFQA_VLAN_PROTO]),
1150 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])));
1151 }
1152
1153 if (nfqa[NFQA_L2HDR]) {
1154 int mac_header_len = entry->skb->network_header -
1155 entry->skb->mac_header;
1156
1157 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
1158 return -EINVAL;
1159 else if (mac_header_len > 0)
1160 memcpy(skb_mac_header(entry->skb),
1161 nla_data(nfqa[NFQA_L2HDR]),
1162 mac_header_len);
1163 }
1164
1165 return 0;
1166 }
1167
1168 static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
1169 const struct nlattr * const nfqa[])
1170 {
1171 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1172 u_int16_t queue_num = ntohs(info->nfmsg->res_id);
1173 struct nfqnl_msg_verdict_hdr *vhdr;
1174 enum ip_conntrack_info ctinfo;
1175 struct nfqnl_instance *queue;
1176 struct nf_queue_entry *entry;
1177 struct nfnl_ct_hook *nfnl_ct;
1178 struct nf_conn *ct = NULL;
1179 unsigned int verdict;
1180 int err;
1181
1182 queue = verdict_instance_lookup(q, queue_num,
1183 NETLINK_CB(skb).portid);
1184 if (IS_ERR(queue))
1185 return PTR_ERR(queue);
1186
1187 vhdr = verdicthdr_get(nfqa);
1188 if (!vhdr)
1189 return -EINVAL;
1190
1191 verdict = ntohl(vhdr->verdict);
1192
1193 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1194 if (entry == NULL)
1195 return -ENOENT;
1196
1197 /* rcu lock already held from nfnl->call_rcu. */
1198 nfnl_ct = rcu_dereference(nfnl_ct_hook);
1199
1200 if (nfqa[NFQA_CT]) {
1201 if (nfnl_ct != NULL)
1202 ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry,
1203 &ctinfo);
1204 }
1205
1206 if (entry->state.pf == PF_BRIDGE) {
1207 err = nfqa_parse_bridge(entry, nfqa);
1208 if (err < 0)
1209 return err;
1210 }
1211
1212 if (nfqa[NFQA_PAYLOAD]) {
1213 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1214 int diff = payload_len - entry->skb->len;
1215
1216 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1217 payload_len, entry, diff) < 0)
1218 verdict = NF_DROP;
1219
1220 if (ct && diff)
1221 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1222 }
1223
1224 if (nfqa[NFQA_MARK])
1225 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1226
1227 nfqnl_reinject(entry, verdict);
1228 return 0;
1229 }
1230
1231 static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info,
1232 const struct nlattr * const cda[])
1233 {
1234 return -ENOTSUPP;
1235 }
1236
1237 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1238 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1239 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1240 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 },
1241 [NFQA_CFG_MASK] = { .type = NLA_U32 },
1242 [NFQA_CFG_FLAGS] = { .type = NLA_U32 },
1243 };
1244
1245 static const struct nf_queue_handler nfqh = {
1246 .outfn = nfqnl_enqueue_packet,
1247 .nf_hook_drop = nfqnl_nf_hook_drop,
1248 };
1249
1250 static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info,
1251 const struct nlattr * const nfqa[])
1252 {
1253 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1254 u_int16_t queue_num = ntohs(info->nfmsg->res_id);
1255 struct nfqnl_msg_config_cmd *cmd = NULL;
1256 struct nfqnl_instance *queue;
1257 __u32 flags = 0, mask = 0;
1258 int ret = 0;
1259
1260 if (nfqa[NFQA_CFG_CMD]) {
1261 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1262
1263 /* Obsolete commands without queue context */
1264 switch (cmd->command) {
1265 case NFQNL_CFG_CMD_PF_BIND: return 0;
1266 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1267 }
1268 }
1269
1270 /* Check if we support these flags in first place, dependencies should
1271 * be there too not to break atomicity.
1272 */
1273 if (nfqa[NFQA_CFG_FLAGS]) {
1274 if (!nfqa[NFQA_CFG_MASK]) {
1275 /* A mask is needed to specify which flags are being
1276 * changed.
1277 */
1278 return -EINVAL;
1279 }
1280
1281 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1282 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1283
1284 if (flags >= NFQA_CFG_F_MAX)
1285 return -EOPNOTSUPP;
1286
1287 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1288 if (flags & mask & NFQA_CFG_F_SECCTX)
1289 return -EOPNOTSUPP;
1290 #endif
1291 if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
1292 !rcu_access_pointer(nfnl_ct_hook)) {
1293 #ifdef CONFIG_MODULES
1294 nfnl_unlock(NFNL_SUBSYS_QUEUE);
1295 request_module("ip_conntrack_netlink");
1296 nfnl_lock(NFNL_SUBSYS_QUEUE);
1297 if (rcu_access_pointer(nfnl_ct_hook))
1298 return -EAGAIN;
1299 #endif
1300 return -EOPNOTSUPP;
1301 }
1302 }
1303
1304 rcu_read_lock();
1305 queue = instance_lookup(q, queue_num);
1306 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1307 ret = -EPERM;
1308 goto err_out_unlock;
1309 }
1310
1311 if (cmd != NULL) {
1312 switch (cmd->command) {
1313 case NFQNL_CFG_CMD_BIND:
1314 if (queue) {
1315 ret = -EBUSY;
1316 goto err_out_unlock;
1317 }
1318 queue = instance_create(q, queue_num,
1319 NETLINK_CB(skb).portid);
1320 if (IS_ERR(queue)) {
1321 ret = PTR_ERR(queue);
1322 goto err_out_unlock;
1323 }
1324 break;
1325 case NFQNL_CFG_CMD_UNBIND:
1326 if (!queue) {
1327 ret = -ENODEV;
1328 goto err_out_unlock;
1329 }
1330 instance_destroy(q, queue);
1331 goto err_out_unlock;
1332 case NFQNL_CFG_CMD_PF_BIND:
1333 case NFQNL_CFG_CMD_PF_UNBIND:
1334 break;
1335 default:
1336 ret = -ENOTSUPP;
1337 goto err_out_unlock;
1338 }
1339 }
1340
1341 if (!queue) {
1342 ret = -ENODEV;
1343 goto err_out_unlock;
1344 }
1345
1346 if (nfqa[NFQA_CFG_PARAMS]) {
1347 struct nfqnl_msg_config_params *params =
1348 nla_data(nfqa[NFQA_CFG_PARAMS]);
1349
1350 nfqnl_set_mode(queue, params->copy_mode,
1351 ntohl(params->copy_range));
1352 }
1353
1354 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1355 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1356
1357 spin_lock_bh(&queue->lock);
1358 queue->queue_maxlen = ntohl(*queue_maxlen);
1359 spin_unlock_bh(&queue->lock);
1360 }
1361
1362 if (nfqa[NFQA_CFG_FLAGS]) {
1363 spin_lock_bh(&queue->lock);
1364 queue->flags &= ~mask;
1365 queue->flags |= flags & mask;
1366 spin_unlock_bh(&queue->lock);
1367 }
1368
1369 err_out_unlock:
1370 rcu_read_unlock();
1371 return ret;
1372 }
1373
1374 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1375 [NFQNL_MSG_PACKET] = {
1376 .call = nfqnl_recv_unsupp,
1377 .type = NFNL_CB_RCU,
1378 .attr_count = NFQA_MAX,
1379 },
1380 [NFQNL_MSG_VERDICT] = {
1381 .call = nfqnl_recv_verdict,
1382 .type = NFNL_CB_RCU,
1383 .attr_count = NFQA_MAX,
1384 .policy = nfqa_verdict_policy
1385 },
1386 [NFQNL_MSG_CONFIG] = {
1387 .call = nfqnl_recv_config,
1388 .type = NFNL_CB_MUTEX,
1389 .attr_count = NFQA_CFG_MAX,
1390 .policy = nfqa_cfg_policy
1391 },
1392 [NFQNL_MSG_VERDICT_BATCH] = {
1393 .call = nfqnl_recv_verdict_batch,
1394 .type = NFNL_CB_RCU,
1395 .attr_count = NFQA_MAX,
1396 .policy = nfqa_verdict_batch_policy
1397 },
1398 };
1399
1400 static const struct nfnetlink_subsystem nfqnl_subsys = {
1401 .name = "nf_queue",
1402 .subsys_id = NFNL_SUBSYS_QUEUE,
1403 .cb_count = NFQNL_MSG_MAX,
1404 .cb = nfqnl_cb,
1405 };
1406
1407 #ifdef CONFIG_PROC_FS
1408 struct iter_state {
1409 struct seq_net_private p;
1410 unsigned int bucket;
1411 };
1412
1413 static struct hlist_node *get_first(struct seq_file *seq)
1414 {
1415 struct iter_state *st = seq->private;
1416 struct net *net;
1417 struct nfnl_queue_net *q;
1418
1419 if (!st)
1420 return NULL;
1421
1422 net = seq_file_net(seq);
1423 q = nfnl_queue_pernet(net);
1424 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1425 if (!hlist_empty(&q->instance_table[st->bucket]))
1426 return q->instance_table[st->bucket].first;
1427 }
1428 return NULL;
1429 }
1430
1431 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1432 {
1433 struct iter_state *st = seq->private;
1434 struct net *net = seq_file_net(seq);
1435
1436 h = h->next;
1437 while (!h) {
1438 struct nfnl_queue_net *q;
1439
1440 if (++st->bucket >= INSTANCE_BUCKETS)
1441 return NULL;
1442
1443 q = nfnl_queue_pernet(net);
1444 h = q->instance_table[st->bucket].first;
1445 }
1446 return h;
1447 }
1448
1449 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1450 {
1451 struct hlist_node *head;
1452 head = get_first(seq);
1453
1454 if (head)
1455 while (pos && (head = get_next(seq, head)))
1456 pos--;
1457 return pos ? NULL : head;
1458 }
1459
1460 static void *seq_start(struct seq_file *s, loff_t *pos)
1461 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1462 {
1463 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1464 return get_idx(s, *pos);
1465 }
1466
1467 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1468 {
1469 (*pos)++;
1470 return get_next(s, v);
1471 }
1472
1473 static void seq_stop(struct seq_file *s, void *v)
1474 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1475 {
1476 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1477 }
1478
1479 static int seq_show(struct seq_file *s, void *v)
1480 {
1481 const struct nfqnl_instance *inst = v;
1482
1483 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1484 inst->queue_num,
1485 inst->peer_portid, inst->queue_total,
1486 inst->copy_mode, inst->copy_range,
1487 inst->queue_dropped, inst->queue_user_dropped,
1488 inst->id_sequence, 1);
1489 return 0;
1490 }
1491
1492 static const struct seq_operations nfqnl_seq_ops = {
1493 .start = seq_start,
1494 .next = seq_next,
1495 .stop = seq_stop,
1496 .show = seq_show,
1497 };
1498 #endif /* PROC_FS */
1499
1500 static int __net_init nfnl_queue_net_init(struct net *net)
1501 {
1502 unsigned int i;
1503 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1504
1505 for (i = 0; i < INSTANCE_BUCKETS; i++)
1506 INIT_HLIST_HEAD(&q->instance_table[i]);
1507
1508 spin_lock_init(&q->instances_lock);
1509
1510 #ifdef CONFIG_PROC_FS
1511 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter,
1512 &nfqnl_seq_ops, sizeof(struct iter_state)))
1513 return -ENOMEM;
1514 #endif
1515 return 0;
1516 }
1517
1518 static void __net_exit nfnl_queue_net_exit(struct net *net)
1519 {
1520 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1521 unsigned int i;
1522
1523 #ifdef CONFIG_PROC_FS
1524 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1525 #endif
1526 for (i = 0; i < INSTANCE_BUCKETS; i++)
1527 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i]));
1528 }
1529
1530 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
1531 {
1532 synchronize_rcu();
1533 }
1534
1535 static struct pernet_operations nfnl_queue_net_ops = {
1536 .init = nfnl_queue_net_init,
1537 .exit = nfnl_queue_net_exit,
1538 .exit_batch = nfnl_queue_net_exit_batch,
1539 .id = &nfnl_queue_net_id,
1540 .size = sizeof(struct nfnl_queue_net),
1541 };
1542
1543 static int __init nfnetlink_queue_init(void)
1544 {
1545 int status;
1546
1547 status = register_pernet_subsys(&nfnl_queue_net_ops);
1548 if (status < 0) {
1549 pr_err("failed to register pernet ops\n");
1550 goto out;
1551 }
1552
1553 netlink_register_notifier(&nfqnl_rtnl_notifier);
1554 status = nfnetlink_subsys_register(&nfqnl_subsys);
1555 if (status < 0) {
1556 pr_err("failed to create netlink socket\n");
1557 goto cleanup_netlink_notifier;
1558 }
1559
1560 status = register_netdevice_notifier(&nfqnl_dev_notifier);
1561 if (status < 0) {
1562 pr_err("failed to register netdevice notifier\n");
1563 goto cleanup_netlink_subsys;
1564 }
1565
1566 nf_register_queue_handler(&nfqh);
1567
1568 return status;
1569
1570 cleanup_netlink_subsys:
1571 nfnetlink_subsys_unregister(&nfqnl_subsys);
1572 cleanup_netlink_notifier:
1573 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1574 unregister_pernet_subsys(&nfnl_queue_net_ops);
1575 out:
1576 return status;
1577 }
1578
1579 static void __exit nfnetlink_queue_fini(void)
1580 {
1581 nf_unregister_queue_handler();
1582 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1583 nfnetlink_subsys_unregister(&nfqnl_subsys);
1584 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1585 unregister_pernet_subsys(&nfnl_queue_net_ops);
1586
1587 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1588 }
1589
1590 MODULE_DESCRIPTION("netfilter packet queue handler");
1591 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1592 MODULE_LICENSE("GPL");
1593 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1594
1595 module_init(nfnetlink_queue_init);
1596 module_exit(nfnetlink_queue_fini);
Michael's Linux tree.