]> git.ipfire.org Git - people/ms/linux.git/blob - net/netfilter/nfnetlink_queue.c
projects / people / ms / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'soc-fixes-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[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 const 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 = 0;
391 const struct nfnl_ct_hook *nfnl_ct;
392 bool csum_verify;
393 char *secdata = NULL;
394 u32 seclen = 0;
395 ktime_t tstamp;
396
397 size = nlmsg_total_size(sizeof(struct nfgenmsg))
398 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
399 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
400 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
401 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
402 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
403 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
404 #endif
405 + nla_total_size(sizeof(u_int32_t)) /* mark */
406 + nla_total_size(sizeof(u_int32_t)) /* priority */
407 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
408 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
409 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
410
411 tstamp = skb_tstamp_cond(entskb, false);
412 if (tstamp)
413 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
414
415 size += nfqnl_get_bridge_size(entry);
416
417 if (entry->state.hook <= NF_INET_FORWARD ||
418 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
419 csum_verify = !skb_csum_unnecessary(entskb);
420 else
421 csum_verify = false;
422
423 outdev = entry->state.out;
424
425 switch ((enum nfqnl_config_mode)READ_ONCE(queue->copy_mode)) {
426 case NFQNL_COPY_META:
427 case NFQNL_COPY_NONE:
428 break;
429
430 case NFQNL_COPY_PACKET:
431 if (!(queue->flags & NFQA_CFG_F_GSO) &&
432 entskb->ip_summed == CHECKSUM_PARTIAL &&
433 skb_checksum_help(entskb))
434 return NULL;
435
436 data_len = READ_ONCE(queue->copy_range);
437 if (data_len > entskb->len)
438 data_len = entskb->len;
439
440 hlen = skb_zerocopy_headlen(entskb);
441 hlen = min_t(unsigned int, hlen, data_len);
442 size += sizeof(struct nlattr) + hlen;
443 cap_len = entskb->len;
444 break;
445 }
446
447 nfnl_ct = rcu_dereference(nfnl_ct_hook);
448
449 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
450 if (queue->flags & NFQA_CFG_F_CONNTRACK) {
451 if (nfnl_ct != NULL) {
452 ct = nf_ct_get(entskb, &ctinfo);
453 if (ct != NULL)
454 size += nfnl_ct->build_size(ct);
455 }
456 }
457 #endif
458
459 if (queue->flags & NFQA_CFG_F_UID_GID) {
460 size += (nla_total_size(sizeof(u_int32_t)) /* uid */
461 + nla_total_size(sizeof(u_int32_t))); /* gid */
462 }
463
464 if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
465 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
466 if (seclen)
467 size += nla_total_size(seclen);
468 }
469
470 skb = alloc_skb(size, GFP_ATOMIC);
471 if (!skb) {
472 skb_tx_error(entskb);
473 goto nlmsg_failure;
474 }
475
476 nlh = nfnl_msg_put(skb, 0, 0,
477 nfnl_msg_type(NFNL_SUBSYS_QUEUE, NFQNL_MSG_PACKET),
478 0, entry->state.pf, NFNETLINK_V0,
479 htons(queue->queue_num));
480 if (!nlh) {
481 skb_tx_error(entskb);
482 kfree_skb(skb);
483 goto nlmsg_failure;
484 }
485
486 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
487 pmsg = nla_data(nla);
488 pmsg->hw_protocol = entskb->protocol;
489 pmsg->hook = entry->state.hook;
490 *packet_id_ptr = &pmsg->packet_id;
491
492 indev = entry->state.in;
493 if (indev) {
494 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
495 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
496 goto nla_put_failure;
497 #else
498 if (entry->state.pf == PF_BRIDGE) {
499 /* Case 1: indev is physical input device, we need to
500 * look for bridge group (when called from
501 * netfilter_bridge) */
502 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
503 htonl(indev->ifindex)) ||
504 /* this is the bridge group "brX" */
505 /* rcu_read_lock()ed by __nf_queue */
506 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
507 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
508 goto nla_put_failure;
509 } else {
510 int physinif;
511
512 /* Case 2: indev is bridge group, we need to look for
513 * physical device (when called from ipv4) */
514 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
515 htonl(indev->ifindex)))
516 goto nla_put_failure;
517
518 physinif = nf_bridge_get_physinif(entskb);
519 if (physinif &&
520 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
521 htonl(physinif)))
522 goto nla_put_failure;
523 }
524 #endif
525 }
526
527 if (outdev) {
528 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
529 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
530 goto nla_put_failure;
531 #else
532 if (entry->state.pf == PF_BRIDGE) {
533 /* Case 1: outdev is physical output device, we need to
534 * look for bridge group (when called from
535 * netfilter_bridge) */
536 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
537 htonl(outdev->ifindex)) ||
538 /* this is the bridge group "brX" */
539 /* rcu_read_lock()ed by __nf_queue */
540 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
541 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
542 goto nla_put_failure;
543 } else {
544 int physoutif;
545
546 /* Case 2: outdev is bridge group, we need to look for
547 * physical output device (when called from ipv4) */
548 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
549 htonl(outdev->ifindex)))
550 goto nla_put_failure;
551
552 physoutif = nf_bridge_get_physoutif(entskb);
553 if (physoutif &&
554 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
555 htonl(physoutif)))
556 goto nla_put_failure;
557 }
558 #endif
559 }
560
561 if (entskb->mark &&
562 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
563 goto nla_put_failure;
564
565 if (entskb->priority &&
566 nla_put_be32(skb, NFQA_PRIORITY, htonl(entskb->priority)))
567 goto nla_put_failure;
568
569 if (indev && entskb->dev &&
570 skb_mac_header_was_set(entskb) &&
571 skb_mac_header_len(entskb) != 0) {
572 struct nfqnl_msg_packet_hw phw;
573 int len;
574
575 memset(&phw, 0, sizeof(phw));
576 len = dev_parse_header(entskb, phw.hw_addr);
577 if (len) {
578 phw.hw_addrlen = htons(len);
579 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
580 goto nla_put_failure;
581 }
582 }
583
584 if (nfqnl_put_bridge(entry, skb) < 0)
585 goto nla_put_failure;
586
587 if (entry->state.hook <= NF_INET_FORWARD && tstamp) {
588 struct nfqnl_msg_packet_timestamp ts;
589 struct timespec64 kts = ktime_to_timespec64(tstamp);
590
591 ts.sec = cpu_to_be64(kts.tv_sec);
592 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
593
594 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
595 goto nla_put_failure;
596 }
597
598 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
599 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
600 goto nla_put_failure;
601
602 if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
603 goto nla_put_failure;
604
605 if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
606 goto nla_put_failure;
607
608 if (cap_len > data_len &&
609 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
610 goto nla_put_failure;
611
612 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
613 goto nla_put_failure;
614
615 if (data_len) {
616 struct nlattr *nla;
617
618 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
619 goto nla_put_failure;
620
621 nla = skb_put(skb, sizeof(*nla));
622 nla->nla_type = NFQA_PAYLOAD;
623 nla->nla_len = nla_attr_size(data_len);
624
625 if (skb_zerocopy(skb, entskb, data_len, hlen))
626 goto nla_put_failure;
627 }
628
629 nlh->nlmsg_len = skb->len;
630 if (seclen)
631 security_release_secctx(secdata, seclen);
632 return skb;
633
634 nla_put_failure:
635 skb_tx_error(entskb);
636 kfree_skb(skb);
637 net_err_ratelimited("nf_queue: error creating packet message\n");
638 nlmsg_failure:
639 if (seclen)
640 security_release_secctx(secdata, seclen);
641 return NULL;
642 }
643
644 static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry)
645 {
646 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
647 static const unsigned long flags = IPS_CONFIRMED | IPS_DYING;
648 const struct nf_conn *ct = (void *)skb_nfct(entry->skb);
649
650 if (ct && ((ct->status & flags) == IPS_DYING))
651 return true;
652 #endif
653 return false;
654 }
655
656 static int
657 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
658 struct nf_queue_entry *entry)
659 {
660 struct sk_buff *nskb;
661 int err = -ENOBUFS;
662 __be32 *packet_id_ptr;
663 int failopen = 0;
664
665 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
666 if (nskb == NULL) {
667 err = -ENOMEM;
668 goto err_out;
669 }
670 spin_lock_bh(&queue->lock);
671
672 if (nf_ct_drop_unconfirmed(entry))
673 goto err_out_free_nskb;
674
675 if (queue->queue_total >= queue->queue_maxlen) {
676 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
677 failopen = 1;
678 err = 0;
679 } else {
680 queue->queue_dropped++;
681 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
682 queue->queue_total);
683 }
684 goto err_out_free_nskb;
685 }
686 entry->id = ++queue->id_sequence;
687 *packet_id_ptr = htonl(entry->id);
688
689 /* nfnetlink_unicast will either free the nskb or add it to a socket */
690 err = nfnetlink_unicast(nskb, net, queue->peer_portid);
691 if (err < 0) {
692 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
693 failopen = 1;
694 err = 0;
695 } else {
696 queue->queue_user_dropped++;
697 }
698 goto err_out_unlock;
699 }
700
701 __enqueue_entry(queue, entry);
702
703 spin_unlock_bh(&queue->lock);
704 return 0;
705
706 err_out_free_nskb:
707 kfree_skb(nskb);
708 err_out_unlock:
709 spin_unlock_bh(&queue->lock);
710 if (failopen)
711 nfqnl_reinject(entry, NF_ACCEPT);
712 err_out:
713 return err;
714 }
715
716 static struct nf_queue_entry *
717 nf_queue_entry_dup(struct nf_queue_entry *e)
718 {
719 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
720
721 if (!entry)
722 return NULL;
723
724 if (nf_queue_entry_get_refs(entry))
725 return entry;
726
727 kfree(entry);
728 return NULL;
729 }
730
731 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
732 /* When called from bridge netfilter, skb->data must point to MAC header
733 * before calling skb_gso_segment(). Else, original MAC header is lost
734 * and segmented skbs will be sent to wrong destination.
735 */
736 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
737 {
738 if (nf_bridge_info_get(skb))
739 __skb_push(skb, skb->network_header - skb->mac_header);
740 }
741
742 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
743 {
744 if (nf_bridge_info_get(skb))
745 __skb_pull(skb, skb->network_header - skb->mac_header);
746 }
747 #else
748 #define nf_bridge_adjust_skb_data(s) do {} while (0)
749 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
750 #endif
751
752 static int
753 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
754 struct sk_buff *skb, struct nf_queue_entry *entry)
755 {
756 int ret = -ENOMEM;
757 struct nf_queue_entry *entry_seg;
758
759 nf_bridge_adjust_segmented_data(skb);
760
761 if (skb->next == NULL) { /* last packet, no need to copy entry */
762 struct sk_buff *gso_skb = entry->skb;
763 entry->skb = skb;
764 ret = __nfqnl_enqueue_packet(net, queue, entry);
765 if (ret)
766 entry->skb = gso_skb;
767 return ret;
768 }
769
770 skb_mark_not_on_list(skb);
771
772 entry_seg = nf_queue_entry_dup(entry);
773 if (entry_seg) {
774 entry_seg->skb = skb;
775 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
776 if (ret)
777 nf_queue_entry_free(entry_seg);
778 }
779 return ret;
780 }
781
782 static int
783 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
784 {
785 unsigned int queued;
786 struct nfqnl_instance *queue;
787 struct sk_buff *skb, *segs, *nskb;
788 int err = -ENOBUFS;
789 struct net *net = entry->state.net;
790 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
791
792 /* rcu_read_lock()ed by nf_hook_thresh */
793 queue = instance_lookup(q, queuenum);
794 if (!queue)
795 return -ESRCH;
796
797 if (queue->copy_mode == NFQNL_COPY_NONE)
798 return -EINVAL;
799
800 skb = entry->skb;
801
802 switch (entry->state.pf) {
803 case NFPROTO_IPV4:
804 skb->protocol = htons(ETH_P_IP);
805 break;
806 case NFPROTO_IPV6:
807 skb->protocol = htons(ETH_P_IPV6);
808 break;
809 }
810
811 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
812 return __nfqnl_enqueue_packet(net, queue, entry);
813
814 nf_bridge_adjust_skb_data(skb);
815 segs = skb_gso_segment(skb, 0);
816 /* Does not use PTR_ERR to limit the number of error codes that can be
817 * returned by nf_queue. For instance, callers rely on -ESRCH to
818 * mean 'ignore this hook'.
819 */
820 if (IS_ERR_OR_NULL(segs))
821 goto out_err;
822 queued = 0;
823 err = 0;
824 skb_list_walk_safe(segs, segs, nskb) {
825 if (err == 0)
826 err = __nfqnl_enqueue_packet_gso(net, queue,
827 segs, entry);
828 if (err == 0)
829 queued++;
830 else
831 kfree_skb(segs);
832 }
833
834 if (queued) {
835 if (err) /* some segments are already queued */
836 nf_queue_entry_free(entry);
837 kfree_skb(skb);
838 return 0;
839 }
840 out_err:
841 nf_bridge_adjust_segmented_data(skb);
842 return err;
843 }
844
845 static int
846 nfqnl_mangle(void *data, unsigned int data_len, struct nf_queue_entry *e, int diff)
847 {
848 struct sk_buff *nskb;
849
850 if (diff < 0) {
851 unsigned int min_len = skb_transport_offset(e->skb);
852
853 if (data_len < min_len)
854 return -EINVAL;
855
856 if (pskb_trim(e->skb, data_len))
857 return -ENOMEM;
858 } else if (diff > 0) {
859 if (data_len > 0xFFFF)
860 return -EINVAL;
861 if (diff > skb_tailroom(e->skb)) {
862 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
863 diff, GFP_ATOMIC);
864 if (!nskb)
865 return -ENOMEM;
866 kfree_skb(e->skb);
867 e->skb = nskb;
868 }
869 skb_put(e->skb, diff);
870 }
871 if (skb_ensure_writable(e->skb, data_len))
872 return -ENOMEM;
873 skb_copy_to_linear_data(e->skb, data, data_len);
874 e->skb->ip_summed = CHECKSUM_NONE;
875 return 0;
876 }
877
878 static int
879 nfqnl_set_mode(struct nfqnl_instance *queue,
880 unsigned char mode, unsigned int range)
881 {
882 int status = 0;
883
884 spin_lock_bh(&queue->lock);
885 switch (mode) {
886 case NFQNL_COPY_NONE:
887 case NFQNL_COPY_META:
888 queue->copy_mode = mode;
889 queue->copy_range = 0;
890 break;
891
892 case NFQNL_COPY_PACKET:
893 queue->copy_mode = mode;
894 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
895 queue->copy_range = NFQNL_MAX_COPY_RANGE;
896 else
897 queue->copy_range = range;
898 break;
899
900 default:
901 status = -EINVAL;
902
903 }
904 spin_unlock_bh(&queue->lock);
905
906 return status;
907 }
908
909 static int
910 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
911 {
912 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
913 int physinif, physoutif;
914
915 physinif = nf_bridge_get_physinif(entry->skb);
916 physoutif = nf_bridge_get_physoutif(entry->skb);
917
918 if (physinif == ifindex || physoutif == ifindex)
919 return 1;
920 #endif
921 if (entry->state.in)
922 if (entry->state.in->ifindex == ifindex)
923 return 1;
924 if (entry->state.out)
925 if (entry->state.out->ifindex == ifindex)
926 return 1;
927
928 return 0;
929 }
930
931 /* drop all packets with either indev or outdev == ifindex from all queue
932 * instances */
933 static void
934 nfqnl_dev_drop(struct net *net, int ifindex)
935 {
936 int i;
937 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
938
939 rcu_read_lock();
940
941 for (i = 0; i < INSTANCE_BUCKETS; i++) {
942 struct nfqnl_instance *inst;
943 struct hlist_head *head = &q->instance_table[i];
944
945 hlist_for_each_entry_rcu(inst, head, hlist)
946 nfqnl_flush(inst, dev_cmp, ifindex);
947 }
948
949 rcu_read_unlock();
950 }
951
952 static int
953 nfqnl_rcv_dev_event(struct notifier_block *this,
954 unsigned long event, void *ptr)
955 {
956 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
957
958 /* Drop any packets associated with the downed device */
959 if (event == NETDEV_DOWN)
960 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
961 return NOTIFY_DONE;
962 }
963
964 static struct notifier_block nfqnl_dev_notifier = {
965 .notifier_call = nfqnl_rcv_dev_event,
966 };
967
968 static void nfqnl_nf_hook_drop(struct net *net)
969 {
970 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
971 int i;
972
973 /* This function is also called on net namespace error unwind,
974 * when pernet_ops->init() failed and ->exit() functions of the
975 * previous pernet_ops gets called.
976 *
977 * This may result in a call to nfqnl_nf_hook_drop() before
978 * struct nfnl_queue_net was allocated.
979 */
980 if (!q)
981 return;
982
983 for (i = 0; i < INSTANCE_BUCKETS; i++) {
984 struct nfqnl_instance *inst;
985 struct hlist_head *head = &q->instance_table[i];
986
987 hlist_for_each_entry_rcu(inst, head, hlist)
988 nfqnl_flush(inst, NULL, 0);
989 }
990 }
991
992 static int
993 nfqnl_rcv_nl_event(struct notifier_block *this,
994 unsigned long event, void *ptr)
995 {
996 struct netlink_notify *n = ptr;
997 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
998
999 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
1000 int i;
1001
1002 /* destroy all instances for this portid */
1003 spin_lock(&q->instances_lock);
1004 for (i = 0; i < INSTANCE_BUCKETS; i++) {
1005 struct hlist_node *t2;
1006 struct nfqnl_instance *inst;
1007 struct hlist_head *head = &q->instance_table[i];
1008
1009 hlist_for_each_entry_safe(inst, t2, head, hlist) {
1010 if (n->portid == inst->peer_portid)
1011 __instance_destroy(inst);
1012 }
1013 }
1014 spin_unlock(&q->instances_lock);
1015 }
1016 return NOTIFY_DONE;
1017 }
1018
1019 static struct notifier_block nfqnl_rtnl_notifier = {
1020 .notifier_call = nfqnl_rcv_nl_event,
1021 };
1022
1023 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
1024 [NFQA_VLAN_TCI] = { .type = NLA_U16},
1025 [NFQA_VLAN_PROTO] = { .type = NLA_U16},
1026 };
1027
1028 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
1029 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1030 [NFQA_MARK] = { .type = NLA_U32 },
1031 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
1032 [NFQA_CT] = { .type = NLA_UNSPEC },
1033 [NFQA_EXP] = { .type = NLA_UNSPEC },
1034 [NFQA_VLAN] = { .type = NLA_NESTED },
1035 [NFQA_PRIORITY] = { .type = NLA_U32 },
1036 };
1037
1038 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
1039 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
1040 [NFQA_MARK] = { .type = NLA_U32 },
1041 [NFQA_PRIORITY] = { .type = NLA_U32 },
1042 };
1043
1044 static struct nfqnl_instance *
1045 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
1046 {
1047 struct nfqnl_instance *queue;
1048
1049 queue = instance_lookup(q, queue_num);
1050 if (!queue)
1051 return ERR_PTR(-ENODEV);
1052
1053 if (queue->peer_portid != nlportid)
1054 return ERR_PTR(-EPERM);
1055
1056 return queue;
1057 }
1058
1059 static struct nfqnl_msg_verdict_hdr*
1060 verdicthdr_get(const struct nlattr * const nfqa[])
1061 {
1062 struct nfqnl_msg_verdict_hdr *vhdr;
1063 unsigned int verdict;
1064
1065 if (!nfqa[NFQA_VERDICT_HDR])
1066 return NULL;
1067
1068 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
1069 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
1070 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
1071 return NULL;
1072 return vhdr;
1073 }
1074
1075 static int nfq_id_after(unsigned int id, unsigned int max)
1076 {
1077 return (int)(id - max) > 0;
1078 }
1079
1080 static int nfqnl_recv_verdict_batch(struct sk_buff *skb,
1081 const struct nfnl_info *info,
1082 const struct nlattr * const nfqa[])
1083 {
1084 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1085 u16 queue_num = ntohs(info->nfmsg->res_id);
1086 struct nf_queue_entry *entry, *tmp;
1087 struct nfqnl_msg_verdict_hdr *vhdr;
1088 struct nfqnl_instance *queue;
1089 unsigned int verdict, maxid;
1090 LIST_HEAD(batch_list);
1091
1092 queue = verdict_instance_lookup(q, queue_num,
1093 NETLINK_CB(skb).portid);
1094 if (IS_ERR(queue))
1095 return PTR_ERR(queue);
1096
1097 vhdr = verdicthdr_get(nfqa);
1098 if (!vhdr)
1099 return -EINVAL;
1100
1101 verdict = ntohl(vhdr->verdict);
1102 maxid = ntohl(vhdr->id);
1103
1104 spin_lock_bh(&queue->lock);
1105
1106 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
1107 if (nfq_id_after(entry->id, maxid))
1108 break;
1109 __dequeue_entry(queue, entry);
1110 list_add_tail(&entry->list, &batch_list);
1111 }
1112
1113 spin_unlock_bh(&queue->lock);
1114
1115 if (list_empty(&batch_list))
1116 return -ENOENT;
1117
1118 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1119 if (nfqa[NFQA_MARK])
1120 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1121
1122 if (nfqa[NFQA_PRIORITY])
1123 entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY]));
1124
1125 nfqnl_reinject(entry, verdict);
1126 }
1127 return 0;
1128 }
1129
1130 static struct nf_conn *nfqnl_ct_parse(const struct nfnl_ct_hook *nfnl_ct,
1131 const struct nlmsghdr *nlh,
1132 const struct nlattr * const nfqa[],
1133 struct nf_queue_entry *entry,
1134 enum ip_conntrack_info *ctinfo)
1135 {
1136 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1137 struct nf_conn *ct;
1138
1139 ct = nf_ct_get(entry->skb, ctinfo);
1140 if (ct == NULL)
1141 return NULL;
1142
1143 if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1144 return NULL;
1145
1146 if (nfqa[NFQA_EXP])
1147 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1148 NETLINK_CB(entry->skb).portid,
1149 nlmsg_report(nlh));
1150 return ct;
1151 #else
1152 return NULL;
1153 #endif
1154 }
1155
1156 static int nfqa_parse_bridge(struct nf_queue_entry *entry,
1157 const struct nlattr * const nfqa[])
1158 {
1159 if (nfqa[NFQA_VLAN]) {
1160 struct nlattr *tb[NFQA_VLAN_MAX + 1];
1161 int err;
1162
1163 err = nla_parse_nested_deprecated(tb, NFQA_VLAN_MAX,
1164 nfqa[NFQA_VLAN],
1165 nfqa_vlan_policy, NULL);
1166 if (err < 0)
1167 return err;
1168
1169 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
1170 return -EINVAL;
1171
1172 __vlan_hwaccel_put_tag(entry->skb,
1173 nla_get_be16(tb[NFQA_VLAN_PROTO]),
1174 ntohs(nla_get_be16(tb[NFQA_VLAN_TCI])));
1175 }
1176
1177 if (nfqa[NFQA_L2HDR]) {
1178 int mac_header_len = entry->skb->network_header -
1179 entry->skb->mac_header;
1180
1181 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
1182 return -EINVAL;
1183 else if (mac_header_len > 0)
1184 memcpy(skb_mac_header(entry->skb),
1185 nla_data(nfqa[NFQA_L2HDR]),
1186 mac_header_len);
1187 }
1188
1189 return 0;
1190 }
1191
1192 static int nfqnl_recv_verdict(struct sk_buff *skb, const struct nfnl_info *info,
1193 const struct nlattr * const nfqa[])
1194 {
1195 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1196 u_int16_t queue_num = ntohs(info->nfmsg->res_id);
1197 const struct nfnl_ct_hook *nfnl_ct;
1198 struct nfqnl_msg_verdict_hdr *vhdr;
1199 enum ip_conntrack_info ctinfo;
1200 struct nfqnl_instance *queue;
1201 struct nf_queue_entry *entry;
1202 struct nf_conn *ct = NULL;
1203 unsigned int verdict;
1204 int err;
1205
1206 queue = verdict_instance_lookup(q, queue_num,
1207 NETLINK_CB(skb).portid);
1208 if (IS_ERR(queue))
1209 return PTR_ERR(queue);
1210
1211 vhdr = verdicthdr_get(nfqa);
1212 if (!vhdr)
1213 return -EINVAL;
1214
1215 verdict = ntohl(vhdr->verdict);
1216
1217 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1218 if (entry == NULL)
1219 return -ENOENT;
1220
1221 /* rcu lock already held from nfnl->call_rcu. */
1222 nfnl_ct = rcu_dereference(nfnl_ct_hook);
1223
1224 if (nfqa[NFQA_CT]) {
1225 if (nfnl_ct != NULL)
1226 ct = nfqnl_ct_parse(nfnl_ct, info->nlh, nfqa, entry,
1227 &ctinfo);
1228 }
1229
1230 if (entry->state.pf == PF_BRIDGE) {
1231 err = nfqa_parse_bridge(entry, nfqa);
1232 if (err < 0)
1233 return err;
1234 }
1235
1236 if (nfqa[NFQA_PAYLOAD]) {
1237 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1238 int diff = payload_len - entry->skb->len;
1239
1240 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1241 payload_len, entry, diff) < 0)
1242 verdict = NF_DROP;
1243
1244 if (ct && diff)
1245 nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1246 }
1247
1248 if (nfqa[NFQA_MARK])
1249 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1250
1251 if (nfqa[NFQA_PRIORITY])
1252 entry->skb->priority = ntohl(nla_get_be32(nfqa[NFQA_PRIORITY]));
1253
1254 nfqnl_reinject(entry, verdict);
1255 return 0;
1256 }
1257
1258 static int nfqnl_recv_unsupp(struct sk_buff *skb, const struct nfnl_info *info,
1259 const struct nlattr * const cda[])
1260 {
1261 return -ENOTSUPP;
1262 }
1263
1264 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1265 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1266 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1267 [NFQA_CFG_QUEUE_MAXLEN] = { .type = NLA_U32 },
1268 [NFQA_CFG_MASK] = { .type = NLA_U32 },
1269 [NFQA_CFG_FLAGS] = { .type = NLA_U32 },
1270 };
1271
1272 static const struct nf_queue_handler nfqh = {
1273 .outfn = nfqnl_enqueue_packet,
1274 .nf_hook_drop = nfqnl_nf_hook_drop,
1275 };
1276
1277 static int nfqnl_recv_config(struct sk_buff *skb, const struct nfnl_info *info,
1278 const struct nlattr * const nfqa[])
1279 {
1280 struct nfnl_queue_net *q = nfnl_queue_pernet(info->net);
1281 u_int16_t queue_num = ntohs(info->nfmsg->res_id);
1282 struct nfqnl_msg_config_cmd *cmd = NULL;
1283 struct nfqnl_instance *queue;
1284 __u32 flags = 0, mask = 0;
1285 int ret = 0;
1286
1287 if (nfqa[NFQA_CFG_CMD]) {
1288 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1289
1290 /* Obsolete commands without queue context */
1291 switch (cmd->command) {
1292 case NFQNL_CFG_CMD_PF_BIND: return 0;
1293 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1294 }
1295 }
1296
1297 /* Check if we support these flags in first place, dependencies should
1298 * be there too not to break atomicity.
1299 */
1300 if (nfqa[NFQA_CFG_FLAGS]) {
1301 if (!nfqa[NFQA_CFG_MASK]) {
1302 /* A mask is needed to specify which flags are being
1303 * changed.
1304 */
1305 return -EINVAL;
1306 }
1307
1308 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1309 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1310
1311 if (flags >= NFQA_CFG_F_MAX)
1312 return -EOPNOTSUPP;
1313
1314 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1315 if (flags & mask & NFQA_CFG_F_SECCTX)
1316 return -EOPNOTSUPP;
1317 #endif
1318 if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
1319 !rcu_access_pointer(nfnl_ct_hook)) {
1320 #ifdef CONFIG_MODULES
1321 nfnl_unlock(NFNL_SUBSYS_QUEUE);
1322 request_module("ip_conntrack_netlink");
1323 nfnl_lock(NFNL_SUBSYS_QUEUE);
1324 if (rcu_access_pointer(nfnl_ct_hook))
1325 return -EAGAIN;
1326 #endif
1327 return -EOPNOTSUPP;
1328 }
1329 }
1330
1331 rcu_read_lock();
1332 queue = instance_lookup(q, queue_num);
1333 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1334 ret = -EPERM;
1335 goto err_out_unlock;
1336 }
1337
1338 if (cmd != NULL) {
1339 switch (cmd->command) {
1340 case NFQNL_CFG_CMD_BIND:
1341 if (queue) {
1342 ret = -EBUSY;
1343 goto err_out_unlock;
1344 }
1345 queue = instance_create(q, queue_num,
1346 NETLINK_CB(skb).portid);
1347 if (IS_ERR(queue)) {
1348 ret = PTR_ERR(queue);
1349 goto err_out_unlock;
1350 }
1351 break;
1352 case NFQNL_CFG_CMD_UNBIND:
1353 if (!queue) {
1354 ret = -ENODEV;
1355 goto err_out_unlock;
1356 }
1357 instance_destroy(q, queue);
1358 goto err_out_unlock;
1359 case NFQNL_CFG_CMD_PF_BIND:
1360 case NFQNL_CFG_CMD_PF_UNBIND:
1361 break;
1362 default:
1363 ret = -ENOTSUPP;
1364 goto err_out_unlock;
1365 }
1366 }
1367
1368 if (!queue) {
1369 ret = -ENODEV;
1370 goto err_out_unlock;
1371 }
1372
1373 if (nfqa[NFQA_CFG_PARAMS]) {
1374 struct nfqnl_msg_config_params *params =
1375 nla_data(nfqa[NFQA_CFG_PARAMS]);
1376
1377 nfqnl_set_mode(queue, params->copy_mode,
1378 ntohl(params->copy_range));
1379 }
1380
1381 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1382 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1383
1384 spin_lock_bh(&queue->lock);
1385 queue->queue_maxlen = ntohl(*queue_maxlen);
1386 spin_unlock_bh(&queue->lock);
1387 }
1388
1389 if (nfqa[NFQA_CFG_FLAGS]) {
1390 spin_lock_bh(&queue->lock);
1391 queue->flags &= ~mask;
1392 queue->flags |= flags & mask;
1393 spin_unlock_bh(&queue->lock);
1394 }
1395
1396 err_out_unlock:
1397 rcu_read_unlock();
1398 return ret;
1399 }
1400
1401 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1402 [NFQNL_MSG_PACKET] = {
1403 .call = nfqnl_recv_unsupp,
1404 .type = NFNL_CB_RCU,
1405 .attr_count = NFQA_MAX,
1406 },
1407 [NFQNL_MSG_VERDICT] = {
1408 .call = nfqnl_recv_verdict,
1409 .type = NFNL_CB_RCU,
1410 .attr_count = NFQA_MAX,
1411 .policy = nfqa_verdict_policy
1412 },
1413 [NFQNL_MSG_CONFIG] = {
1414 .call = nfqnl_recv_config,
1415 .type = NFNL_CB_MUTEX,
1416 .attr_count = NFQA_CFG_MAX,
1417 .policy = nfqa_cfg_policy
1418 },
1419 [NFQNL_MSG_VERDICT_BATCH] = {
1420 .call = nfqnl_recv_verdict_batch,
1421 .type = NFNL_CB_RCU,
1422 .attr_count = NFQA_MAX,
1423 .policy = nfqa_verdict_batch_policy
1424 },
1425 };
1426
1427 static const struct nfnetlink_subsystem nfqnl_subsys = {
1428 .name = "nf_queue",
1429 .subsys_id = NFNL_SUBSYS_QUEUE,
1430 .cb_count = NFQNL_MSG_MAX,
1431 .cb = nfqnl_cb,
1432 };
1433
1434 #ifdef CONFIG_PROC_FS
1435 struct iter_state {
1436 struct seq_net_private p;
1437 unsigned int bucket;
1438 };
1439
1440 static struct hlist_node *get_first(struct seq_file *seq)
1441 {
1442 struct iter_state *st = seq->private;
1443 struct net *net;
1444 struct nfnl_queue_net *q;
1445
1446 if (!st)
1447 return NULL;
1448
1449 net = seq_file_net(seq);
1450 q = nfnl_queue_pernet(net);
1451 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1452 if (!hlist_empty(&q->instance_table[st->bucket]))
1453 return q->instance_table[st->bucket].first;
1454 }
1455 return NULL;
1456 }
1457
1458 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1459 {
1460 struct iter_state *st = seq->private;
1461 struct net *net = seq_file_net(seq);
1462
1463 h = h->next;
1464 while (!h) {
1465 struct nfnl_queue_net *q;
1466
1467 if (++st->bucket >= INSTANCE_BUCKETS)
1468 return NULL;
1469
1470 q = nfnl_queue_pernet(net);
1471 h = q->instance_table[st->bucket].first;
1472 }
1473 return h;
1474 }
1475
1476 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1477 {
1478 struct hlist_node *head;
1479 head = get_first(seq);
1480
1481 if (head)
1482 while (pos && (head = get_next(seq, head)))
1483 pos--;
1484 return pos ? NULL : head;
1485 }
1486
1487 static void *seq_start(struct seq_file *s, loff_t *pos)
1488 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1489 {
1490 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1491 return get_idx(s, *pos);
1492 }
1493
1494 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1495 {
1496 (*pos)++;
1497 return get_next(s, v);
1498 }
1499
1500 static void seq_stop(struct seq_file *s, void *v)
1501 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1502 {
1503 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1504 }
1505
1506 static int seq_show(struct seq_file *s, void *v)
1507 {
1508 const struct nfqnl_instance *inst = v;
1509
1510 seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1511 inst->queue_num,
1512 inst->peer_portid, inst->queue_total,
1513 inst->copy_mode, inst->copy_range,
1514 inst->queue_dropped, inst->queue_user_dropped,
1515 inst->id_sequence, 1);
1516 return 0;
1517 }
1518
1519 static const struct seq_operations nfqnl_seq_ops = {
1520 .start = seq_start,
1521 .next = seq_next,
1522 .stop = seq_stop,
1523 .show = seq_show,
1524 };
1525 #endif /* PROC_FS */
1526
1527 static int __net_init nfnl_queue_net_init(struct net *net)
1528 {
1529 unsigned int i;
1530 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1531
1532 for (i = 0; i < INSTANCE_BUCKETS; i++)
1533 INIT_HLIST_HEAD(&q->instance_table[i]);
1534
1535 spin_lock_init(&q->instances_lock);
1536
1537 #ifdef CONFIG_PROC_FS
1538 if (!proc_create_net("nfnetlink_queue", 0440, net->nf.proc_netfilter,
1539 &nfqnl_seq_ops, sizeof(struct iter_state)))
1540 return -ENOMEM;
1541 #endif
1542 return 0;
1543 }
1544
1545 static void __net_exit nfnl_queue_net_exit(struct net *net)
1546 {
1547 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1548 unsigned int i;
1549
1550 #ifdef CONFIG_PROC_FS
1551 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1552 #endif
1553 for (i = 0; i < INSTANCE_BUCKETS; i++)
1554 WARN_ON_ONCE(!hlist_empty(&q->instance_table[i]));
1555 }
1556
1557 static struct pernet_operations nfnl_queue_net_ops = {
1558 .init = nfnl_queue_net_init,
1559 .exit = nfnl_queue_net_exit,
1560 .id = &nfnl_queue_net_id,
1561 .size = sizeof(struct nfnl_queue_net),
1562 };
1563
1564 static int __init nfnetlink_queue_init(void)
1565 {
1566 int status;
1567
1568 status = register_pernet_subsys(&nfnl_queue_net_ops);
1569 if (status < 0) {
1570 pr_err("failed to register pernet ops\n");
1571 goto out;
1572 }
1573
1574 netlink_register_notifier(&nfqnl_rtnl_notifier);
1575 status = nfnetlink_subsys_register(&nfqnl_subsys);
1576 if (status < 0) {
1577 pr_err("failed to create netlink socket\n");
1578 goto cleanup_netlink_notifier;
1579 }
1580
1581 status = register_netdevice_notifier(&nfqnl_dev_notifier);
1582 if (status < 0) {
1583 pr_err("failed to register netdevice notifier\n");
1584 goto cleanup_netlink_subsys;
1585 }
1586
1587 nf_register_queue_handler(&nfqh);
1588
1589 return status;
1590
1591 cleanup_netlink_subsys:
1592 nfnetlink_subsys_unregister(&nfqnl_subsys);
1593 cleanup_netlink_notifier:
1594 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1595 unregister_pernet_subsys(&nfnl_queue_net_ops);
1596 out:
1597 return status;
1598 }
1599
1600 static void __exit nfnetlink_queue_fini(void)
1601 {
1602 nf_unregister_queue_handler();
1603 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1604 nfnetlink_subsys_unregister(&nfqnl_subsys);
1605 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1606 unregister_pernet_subsys(&nfnl_queue_net_ops);
1607
1608 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1609 }
1610
1611 MODULE_DESCRIPTION("netfilter packet queue handler");
1612 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1613 MODULE_LICENSE("GPL");
1614 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1615
1616 module_init(nfnetlink_queue_init);
1617 module_exit(nfnetlink_queue_fini);
Michael's Linux tree.