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nfc: Fix portid type in urelease_work
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / net / netfilter / nfnetlink_queue_core.c
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CommitLineData
1/*
2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
4 *
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
7 *
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17#include <linux/module.h>
18#include <linux/skbuff.h>
19#include <linux/init.h>
20#include <linux/spinlock.h>
21#include <linux/slab.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
24#include <linux/netfilter.h>
25#include <linux/proc_fs.h>
26#include <linux/netfilter_ipv4.h>
27#include <linux/netfilter_ipv6.h>
28#include <linux/netfilter_bridge.h>
29#include <linux/netfilter/nfnetlink.h>
30#include <linux/netfilter/nfnetlink_queue.h>
31#include <linux/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#include <net/netfilter/nfnetlink_queue.h>
37
38#include <linux/atomic.h>
39
40#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
41#include "../bridge/br_private.h"
42#endif
43
44#define NFQNL_QMAX_DEFAULT 1024
45
46/* We're using struct nlattr which has 16bit nla_len. Note that nla_len
47 * includes the header length. Thus, the maximum packet length that we
48 * support is 65531 bytes. We send truncated packets if the specified length
49 * is larger than that. Userspace can check for presence of NFQA_CAP_LEN
50 * attribute to detect truncation.
51 */
52#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
53
54struct nfqnl_instance {
55 struct hlist_node hlist; /* global list of queues */
56 struct rcu_head rcu;
57
58 int peer_portid;
59 unsigned int queue_maxlen;
60 unsigned int copy_range;
61 unsigned int queue_dropped;
62 unsigned int queue_user_dropped;
63
64
65 u_int16_t queue_num; /* number of this queue */
66 u_int8_t copy_mode;
67 u_int32_t flags; /* Set using NFQA_CFG_FLAGS */
68/*
69 * Following fields are dirtied for each queued packet,
70 * keep them in same cache line if possible.
71 */
72 spinlock_t lock;
73 unsigned int queue_total;
74 unsigned int id_sequence; /* 'sequence' of pkt ids */
75 struct list_head queue_list; /* packets in queue */
76};
77
78typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
79
80static int nfnl_queue_net_id __read_mostly;
81
82#define INSTANCE_BUCKETS 16
83struct nfnl_queue_net {
84 spinlock_t instances_lock;
85 struct hlist_head instance_table[INSTANCE_BUCKETS];
86};
87
88static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
89{
90 return net_generic(net, nfnl_queue_net_id);
91}
92
93static inline u_int8_t instance_hashfn(u_int16_t queue_num)
94{
95 return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
96}
97
98static struct nfqnl_instance *
99instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
100{
101 struct hlist_head *head;
102 struct nfqnl_instance *inst;
103
104 head = &q->instance_table[instance_hashfn(queue_num)];
105 hlist_for_each_entry_rcu(inst, head, hlist) {
106 if (inst->queue_num == queue_num)
107 return inst;
108 }
109 return NULL;
110}
111
112static struct nfqnl_instance *
113instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
114 int portid)
115{
116 struct nfqnl_instance *inst;
117 unsigned int h;
118 int err;
119
120 spin_lock(&q->instances_lock);
121 if (instance_lookup(q, queue_num)) {
122 err = -EEXIST;
123 goto out_unlock;
124 }
125
126 inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
127 if (!inst) {
128 err = -ENOMEM;
129 goto out_unlock;
130 }
131
132 inst->queue_num = queue_num;
133 inst->peer_portid = portid;
134 inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
135 inst->copy_range = NFQNL_MAX_COPY_RANGE;
136 inst->copy_mode = NFQNL_COPY_NONE;
137 spin_lock_init(&inst->lock);
138 INIT_LIST_HEAD(&inst->queue_list);
139
140 if (!try_module_get(THIS_MODULE)) {
141 err = -EAGAIN;
142 goto out_free;
143 }
144
145 h = instance_hashfn(queue_num);
146 hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
147
148 spin_unlock(&q->instances_lock);
149
150 return inst;
151
152out_free:
153 kfree(inst);
154out_unlock:
155 spin_unlock(&q->instances_lock);
156 return ERR_PTR(err);
157}
158
159static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
160 unsigned long data);
161
162static void
163instance_destroy_rcu(struct rcu_head *head)
164{
165 struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
166 rcu);
167
168 nfqnl_flush(inst, NULL, 0);
169 kfree(inst);
170 module_put(THIS_MODULE);
171}
172
173static void
174__instance_destroy(struct nfqnl_instance *inst)
175{
176 hlist_del_rcu(&inst->hlist);
177 call_rcu(&inst->rcu, instance_destroy_rcu);
178}
179
180static void
181instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
182{
183 spin_lock(&q->instances_lock);
184 __instance_destroy(inst);
185 spin_unlock(&q->instances_lock);
186}
187
188static inline void
189__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
190{
191 list_add_tail(&entry->list, &queue->queue_list);
192 queue->queue_total++;
193}
194
195static void
196__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
197{
198 list_del(&entry->list);
199 queue->queue_total--;
200}
201
202static struct nf_queue_entry *
203find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
204{
205 struct nf_queue_entry *entry = NULL, *i;
206
207 spin_lock_bh(&queue->lock);
208
209 list_for_each_entry(i, &queue->queue_list, list) {
210 if (i->id == id) {
211 entry = i;
212 break;
213 }
214 }
215
216 if (entry)
217 __dequeue_entry(queue, entry);
218
219 spin_unlock_bh(&queue->lock);
220
221 return entry;
222}
223
224static void
225nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
226{
227 struct nf_queue_entry *entry, *next;
228
229 spin_lock_bh(&queue->lock);
230 list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
231 if (!cmpfn || cmpfn(entry, data)) {
232 list_del(&entry->list);
233 queue->queue_total--;
234 nf_reinject(entry, NF_DROP);
235 }
236 }
237 spin_unlock_bh(&queue->lock);
238}
239
240static int
241nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
242 bool csum_verify)
243{
244 __u32 flags = 0;
245
246 if (packet->ip_summed == CHECKSUM_PARTIAL)
247 flags = NFQA_SKB_CSUMNOTREADY;
248 else if (csum_verify)
249 flags = NFQA_SKB_CSUM_NOTVERIFIED;
250
251 if (skb_is_gso(packet))
252 flags |= NFQA_SKB_GSO;
253
254 return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
255}
256
257static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
258{
259 const struct cred *cred;
260
261 if (!sk_fullsock(sk))
262 return 0;
263
264 read_lock_bh(&sk->sk_callback_lock);
265 if (sk->sk_socket && sk->sk_socket->file) {
266 cred = sk->sk_socket->file->f_cred;
267 if (nla_put_be32(skb, NFQA_UID,
268 htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
269 goto nla_put_failure;
270 if (nla_put_be32(skb, NFQA_GID,
271 htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
272 goto nla_put_failure;
273 }
274 read_unlock_bh(&sk->sk_callback_lock);
275 return 0;
276
277nla_put_failure:
278 read_unlock_bh(&sk->sk_callback_lock);
279 return -1;
280}
281
282static struct sk_buff *
283nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
284 struct nf_queue_entry *entry,
285 __be32 **packet_id_ptr)
286{
287 size_t size;
288 size_t data_len = 0, cap_len = 0;
289 unsigned int hlen = 0;
290 struct sk_buff *skb;
291 struct nlattr *nla;
292 struct nfqnl_msg_packet_hdr *pmsg;
293 struct nlmsghdr *nlh;
294 struct nfgenmsg *nfmsg;
295 struct sk_buff *entskb = entry->skb;
296 struct net_device *indev;
297 struct net_device *outdev;
298 struct nf_conn *ct = NULL;
299 enum ip_conntrack_info uninitialized_var(ctinfo);
300 bool csum_verify;
301
302 size = nlmsg_total_size(sizeof(struct nfgenmsg))
303 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
304 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
305 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
306#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
307 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
308 + nla_total_size(sizeof(u_int32_t)) /* ifindex */
309#endif
310 + nla_total_size(sizeof(u_int32_t)) /* mark */
311 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
312 + nla_total_size(sizeof(u_int32_t)) /* skbinfo */
313 + nla_total_size(sizeof(u_int32_t)); /* cap_len */
314
315 if (entskb->tstamp.tv64)
316 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
317
318 if (entry->state.hook <= NF_INET_FORWARD ||
319 (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
320 csum_verify = !skb_csum_unnecessary(entskb);
321 else
322 csum_verify = false;
323
324 outdev = entry->state.out;
325
326 switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
327 case NFQNL_COPY_META:
328 case NFQNL_COPY_NONE:
329 break;
330
331 case NFQNL_COPY_PACKET:
332 if (!(queue->flags & NFQA_CFG_F_GSO) &&
333 entskb->ip_summed == CHECKSUM_PARTIAL &&
334 skb_checksum_help(entskb))
335 return NULL;
336
337 data_len = ACCESS_ONCE(queue->copy_range);
338 if (data_len > entskb->len)
339 data_len = entskb->len;
340
341 hlen = skb_zerocopy_headlen(entskb);
342 hlen = min_t(unsigned int, hlen, data_len);
343 size += sizeof(struct nlattr) + hlen;
344 cap_len = entskb->len;
345 break;
346 }
347
348 if (queue->flags & NFQA_CFG_F_CONNTRACK)
349 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
350
351 if (queue->flags & NFQA_CFG_F_UID_GID) {
352 size += (nla_total_size(sizeof(u_int32_t)) /* uid */
353 + nla_total_size(sizeof(u_int32_t))); /* gid */
354 }
355
356 skb = nfnetlink_alloc_skb(net, size, queue->peer_portid,
357 GFP_ATOMIC);
358 if (!skb) {
359 skb_tx_error(entskb);
360 return NULL;
361 }
362
363 nlh = nlmsg_put(skb, 0, 0,
364 NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
365 sizeof(struct nfgenmsg), 0);
366 if (!nlh) {
367 skb_tx_error(entskb);
368 kfree_skb(skb);
369 return NULL;
370 }
371 nfmsg = nlmsg_data(nlh);
372 nfmsg->nfgen_family = entry->state.pf;
373 nfmsg->version = NFNETLINK_V0;
374 nfmsg->res_id = htons(queue->queue_num);
375
376 nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
377 pmsg = nla_data(nla);
378 pmsg->hw_protocol = entskb->protocol;
379 pmsg->hook = entry->state.hook;
380 *packet_id_ptr = &pmsg->packet_id;
381
382 indev = entry->state.in;
383 if (indev) {
384#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
385 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
386 goto nla_put_failure;
387#else
388 if (entry->state.pf == PF_BRIDGE) {
389 /* Case 1: indev is physical input device, we need to
390 * look for bridge group (when called from
391 * netfilter_bridge) */
392 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
393 htonl(indev->ifindex)) ||
394 /* this is the bridge group "brX" */
395 /* rcu_read_lock()ed by __nf_queue */
396 nla_put_be32(skb, NFQA_IFINDEX_INDEV,
397 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
398 goto nla_put_failure;
399 } else {
400 int physinif;
401
402 /* Case 2: indev is bridge group, we need to look for
403 * physical device (when called from ipv4) */
404 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
405 htonl(indev->ifindex)))
406 goto nla_put_failure;
407
408 physinif = nf_bridge_get_physinif(entskb);
409 if (physinif &&
410 nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
411 htonl(physinif)))
412 goto nla_put_failure;
413 }
414#endif
415 }
416
417 if (outdev) {
418#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
419 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
420 goto nla_put_failure;
421#else
422 if (entry->state.pf == PF_BRIDGE) {
423 /* Case 1: outdev is physical output device, we need to
424 * look for bridge group (when called from
425 * netfilter_bridge) */
426 if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
427 htonl(outdev->ifindex)) ||
428 /* this is the bridge group "brX" */
429 /* rcu_read_lock()ed by __nf_queue */
430 nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
431 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
432 goto nla_put_failure;
433 } else {
434 int physoutif;
435
436 /* Case 2: outdev is bridge group, we need to look for
437 * physical output device (when called from ipv4) */
438 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
439 htonl(outdev->ifindex)))
440 goto nla_put_failure;
441
442 physoutif = nf_bridge_get_physoutif(entskb);
443 if (physoutif &&
444 nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
445 htonl(physoutif)))
446 goto nla_put_failure;
447 }
448#endif
449 }
450
451 if (entskb->mark &&
452 nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
453 goto nla_put_failure;
454
455 if (indev && entskb->dev &&
456 entskb->mac_header != entskb->network_header) {
457 struct nfqnl_msg_packet_hw phw;
458 int len;
459
460 memset(&phw, 0, sizeof(phw));
461 len = dev_parse_header(entskb, phw.hw_addr);
462 if (len) {
463 phw.hw_addrlen = htons(len);
464 if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
465 goto nla_put_failure;
466 }
467 }
468
469 if (entskb->tstamp.tv64) {
470 struct nfqnl_msg_packet_timestamp ts;
471 struct timeval tv = ktime_to_timeval(entskb->tstamp);
472 ts.sec = cpu_to_be64(tv.tv_sec);
473 ts.usec = cpu_to_be64(tv.tv_usec);
474
475 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
476 goto nla_put_failure;
477 }
478
479 if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
480 nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
481 goto nla_put_failure;
482
483 if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
484 goto nla_put_failure;
485
486 if (cap_len > data_len &&
487 nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
488 goto nla_put_failure;
489
490 if (nfqnl_put_packet_info(skb, entskb, csum_verify))
491 goto nla_put_failure;
492
493 if (data_len) {
494 struct nlattr *nla;
495
496 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
497 goto nla_put_failure;
498
499 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
500 nla->nla_type = NFQA_PAYLOAD;
501 nla->nla_len = nla_attr_size(data_len);
502
503 if (skb_zerocopy(skb, entskb, data_len, hlen))
504 goto nla_put_failure;
505 }
506
507 nlh->nlmsg_len = skb->len;
508 return skb;
509
510nla_put_failure:
511 skb_tx_error(entskb);
512 kfree_skb(skb);
513 net_err_ratelimited("nf_queue: error creating packet message\n");
514 return NULL;
515}
516
517static int
518__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
519 struct nf_queue_entry *entry)
520{
521 struct sk_buff *nskb;
522 int err = -ENOBUFS;
523 __be32 *packet_id_ptr;
524 int failopen = 0;
525
526 nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
527 if (nskb == NULL) {
528 err = -ENOMEM;
529 goto err_out;
530 }
531 spin_lock_bh(&queue->lock);
532
533 if (queue->queue_total >= queue->queue_maxlen) {
534 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
535 failopen = 1;
536 err = 0;
537 } else {
538 queue->queue_dropped++;
539 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
540 queue->queue_total);
541 }
542 goto err_out_free_nskb;
543 }
544 entry->id = ++queue->id_sequence;
545 *packet_id_ptr = htonl(entry->id);
546
547 /* nfnetlink_unicast will either free the nskb or add it to a socket */
548 err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
549 if (err < 0) {
550 queue->queue_user_dropped++;
551 goto err_out_unlock;
552 }
553
554 __enqueue_entry(queue, entry);
555
556 spin_unlock_bh(&queue->lock);
557 return 0;
558
559err_out_free_nskb:
560 kfree_skb(nskb);
561err_out_unlock:
562 spin_unlock_bh(&queue->lock);
563 if (failopen)
564 nf_reinject(entry, NF_ACCEPT);
565err_out:
566 return err;
567}
568
569static struct nf_queue_entry *
570nf_queue_entry_dup(struct nf_queue_entry *e)
571{
572 struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
573 if (entry) {
574 if (nf_queue_entry_get_refs(entry))
575 return entry;
576 kfree(entry);
577 }
578 return NULL;
579}
580
581#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
582/* When called from bridge netfilter, skb->data must point to MAC header
583 * before calling skb_gso_segment(). Else, original MAC header is lost
584 * and segmented skbs will be sent to wrong destination.
585 */
586static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
587{
588 if (skb->nf_bridge)
589 __skb_push(skb, skb->network_header - skb->mac_header);
590}
591
592static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
593{
594 if (skb->nf_bridge)
595 __skb_pull(skb, skb->network_header - skb->mac_header);
596}
597#else
598#define nf_bridge_adjust_skb_data(s) do {} while (0)
599#define nf_bridge_adjust_segmented_data(s) do {} while (0)
600#endif
601
602static void free_entry(struct nf_queue_entry *entry)
603{
604 nf_queue_entry_release_refs(entry);
605 kfree(entry);
606}
607
608static int
609__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
610 struct sk_buff *skb, struct nf_queue_entry *entry)
611{
612 int ret = -ENOMEM;
613 struct nf_queue_entry *entry_seg;
614
615 nf_bridge_adjust_segmented_data(skb);
616
617 if (skb->next == NULL) { /* last packet, no need to copy entry */
618 struct sk_buff *gso_skb = entry->skb;
619 entry->skb = skb;
620 ret = __nfqnl_enqueue_packet(net, queue, entry);
621 if (ret)
622 entry->skb = gso_skb;
623 return ret;
624 }
625
626 skb->next = NULL;
627
628 entry_seg = nf_queue_entry_dup(entry);
629 if (entry_seg) {
630 entry_seg->skb = skb;
631 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
632 if (ret)
633 free_entry(entry_seg);
634 }
635 return ret;
636}
637
638static int
639nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
640{
641 unsigned int queued;
642 struct nfqnl_instance *queue;
643 struct sk_buff *skb, *segs;
644 int err = -ENOBUFS;
645 struct net *net = dev_net(entry->state.in ?
646 entry->state.in : entry->state.out);
647 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
648
649 /* rcu_read_lock()ed by nf_hook_slow() */
650 queue = instance_lookup(q, queuenum);
651 if (!queue)
652 return -ESRCH;
653
654 if (queue->copy_mode == NFQNL_COPY_NONE)
655 return -EINVAL;
656
657 skb = entry->skb;
658
659 switch (entry->state.pf) {
660 case NFPROTO_IPV4:
661 skb->protocol = htons(ETH_P_IP);
662 break;
663 case NFPROTO_IPV6:
664 skb->protocol = htons(ETH_P_IPV6);
665 break;
666 }
667
668 if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
669 return __nfqnl_enqueue_packet(net, queue, entry);
670
671 nf_bridge_adjust_skb_data(skb);
672 segs = skb_gso_segment(skb, 0);
673 /* Does not use PTR_ERR to limit the number of error codes that can be
674 * returned by nf_queue. For instance, callers rely on -ECANCELED to
675 * mean 'ignore this hook'.
676 */
677 if (IS_ERR_OR_NULL(segs))
678 goto out_err;
679 queued = 0;
680 err = 0;
681 do {
682 struct sk_buff *nskb = segs->next;
683 if (err == 0)
684 err = __nfqnl_enqueue_packet_gso(net, queue,
685 segs, entry);
686 if (err == 0)
687 queued++;
688 else
689 kfree_skb(segs);
690 segs = nskb;
691 } while (segs);
692
693 if (queued) {
694 if (err) /* some segments are already queued */
695 free_entry(entry);
696 kfree_skb(skb);
697 return 0;
698 }
699 out_err:
700 nf_bridge_adjust_segmented_data(skb);
701 return err;
702}
703
704static int
705nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
706{
707 struct sk_buff *nskb;
708
709 if (diff < 0) {
710 if (pskb_trim(e->skb, data_len))
711 return -ENOMEM;
712 } else if (diff > 0) {
713 if (data_len > 0xFFFF)
714 return -EINVAL;
715 if (diff > skb_tailroom(e->skb)) {
716 nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
717 diff, GFP_ATOMIC);
718 if (!nskb) {
719 printk(KERN_WARNING "nf_queue: OOM "
720 "in mangle, dropping packet\n");
721 return -ENOMEM;
722 }
723 kfree_skb(e->skb);
724 e->skb = nskb;
725 }
726 skb_put(e->skb, diff);
727 }
728 if (!skb_make_writable(e->skb, data_len))
729 return -ENOMEM;
730 skb_copy_to_linear_data(e->skb, data, data_len);
731 e->skb->ip_summed = CHECKSUM_NONE;
732 return 0;
733}
734
735static int
736nfqnl_set_mode(struct nfqnl_instance *queue,
737 unsigned char mode, unsigned int range)
738{
739 int status = 0;
740
741 spin_lock_bh(&queue->lock);
742 switch (mode) {
743 case NFQNL_COPY_NONE:
744 case NFQNL_COPY_META:
745 queue->copy_mode = mode;
746 queue->copy_range = 0;
747 break;
748
749 case NFQNL_COPY_PACKET:
750 queue->copy_mode = mode;
751 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
752 queue->copy_range = NFQNL_MAX_COPY_RANGE;
753 else
754 queue->copy_range = range;
755 break;
756
757 default:
758 status = -EINVAL;
759
760 }
761 spin_unlock_bh(&queue->lock);
762
763 return status;
764}
765
766static int
767dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
768{
769 if (entry->state.in)
770 if (entry->state.in->ifindex == ifindex)
771 return 1;
772 if (entry->state.out)
773 if (entry->state.out->ifindex == ifindex)
774 return 1;
775#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
776 if (entry->skb->nf_bridge) {
777 int physinif, physoutif;
778
779 physinif = nf_bridge_get_physinif(entry->skb);
780 physoutif = nf_bridge_get_physoutif(entry->skb);
781
782 if (physinif == ifindex || physoutif == ifindex)
783 return 1;
784 }
785#endif
786 return 0;
787}
788
789/* drop all packets with either indev or outdev == ifindex from all queue
790 * instances */
791static void
792nfqnl_dev_drop(struct net *net, int ifindex)
793{
794 int i;
795 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
796
797 rcu_read_lock();
798
799 for (i = 0; i < INSTANCE_BUCKETS; i++) {
800 struct nfqnl_instance *inst;
801 struct hlist_head *head = &q->instance_table[i];
802
803 hlist_for_each_entry_rcu(inst, head, hlist)
804 nfqnl_flush(inst, dev_cmp, ifindex);
805 }
806
807 rcu_read_unlock();
808}
809
810#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
811
812static int
813nfqnl_rcv_dev_event(struct notifier_block *this,
814 unsigned long event, void *ptr)
815{
816 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
817
818 /* Drop any packets associated with the downed device */
819 if (event == NETDEV_DOWN)
820 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
821 return NOTIFY_DONE;
822}
823
824static struct notifier_block nfqnl_dev_notifier = {
825 .notifier_call = nfqnl_rcv_dev_event,
826};
827
828static int
829nfqnl_rcv_nl_event(struct notifier_block *this,
830 unsigned long event, void *ptr)
831{
832 struct netlink_notify *n = ptr;
833 struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
834
835 if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
836 int i;
837
838 /* destroy all instances for this portid */
839 spin_lock(&q->instances_lock);
840 for (i = 0; i < INSTANCE_BUCKETS; i++) {
841 struct hlist_node *t2;
842 struct nfqnl_instance *inst;
843 struct hlist_head *head = &q->instance_table[i];
844
845 hlist_for_each_entry_safe(inst, t2, head, hlist) {
846 if (n->portid == inst->peer_portid)
847 __instance_destroy(inst);
848 }
849 }
850 spin_unlock(&q->instances_lock);
851 }
852 return NOTIFY_DONE;
853}
854
855static struct notifier_block nfqnl_rtnl_notifier = {
856 .notifier_call = nfqnl_rcv_nl_event,
857};
858
859static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
860 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
861 [NFQA_MARK] = { .type = NLA_U32 },
862 [NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
863 [NFQA_CT] = { .type = NLA_UNSPEC },
864 [NFQA_EXP] = { .type = NLA_UNSPEC },
865};
866
867static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
868 [NFQA_VERDICT_HDR] = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
869 [NFQA_MARK] = { .type = NLA_U32 },
870};
871
872static struct nfqnl_instance *
873verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
874{
875 struct nfqnl_instance *queue;
876
877 queue = instance_lookup(q, queue_num);
878 if (!queue)
879 return ERR_PTR(-ENODEV);
880
881 if (queue->peer_portid != nlportid)
882 return ERR_PTR(-EPERM);
883
884 return queue;
885}
886
887static struct nfqnl_msg_verdict_hdr*
888verdicthdr_get(const struct nlattr * const nfqa[])
889{
890 struct nfqnl_msg_verdict_hdr *vhdr;
891 unsigned int verdict;
892
893 if (!nfqa[NFQA_VERDICT_HDR])
894 return NULL;
895
896 vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
897 verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
898 if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
899 return NULL;
900 return vhdr;
901}
902
903static int nfq_id_after(unsigned int id, unsigned int max)
904{
905 return (int)(id - max) > 0;
906}
907
908static int
909nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
910 const struct nlmsghdr *nlh,
911 const struct nlattr * const nfqa[])
912{
913 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
914 struct nf_queue_entry *entry, *tmp;
915 unsigned int verdict, maxid;
916 struct nfqnl_msg_verdict_hdr *vhdr;
917 struct nfqnl_instance *queue;
918 LIST_HEAD(batch_list);
919 u16 queue_num = ntohs(nfmsg->res_id);
920
921 struct net *net = sock_net(ctnl);
922 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
923
924 queue = verdict_instance_lookup(q, queue_num,
925 NETLINK_CB(skb).portid);
926 if (IS_ERR(queue))
927 return PTR_ERR(queue);
928
929 vhdr = verdicthdr_get(nfqa);
930 if (!vhdr)
931 return -EINVAL;
932
933 verdict = ntohl(vhdr->verdict);
934 maxid = ntohl(vhdr->id);
935
936 spin_lock_bh(&queue->lock);
937
938 list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
939 if (nfq_id_after(entry->id, maxid))
940 break;
941 __dequeue_entry(queue, entry);
942 list_add_tail(&entry->list, &batch_list);
943 }
944
945 spin_unlock_bh(&queue->lock);
946
947 if (list_empty(&batch_list))
948 return -ENOENT;
949
950 list_for_each_entry_safe(entry, tmp, &batch_list, list) {
951 if (nfqa[NFQA_MARK])
952 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
953 nf_reinject(entry, verdict);
954 }
955 return 0;
956}
957
958static int
959nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
960 const struct nlmsghdr *nlh,
961 const struct nlattr * const nfqa[])
962{
963 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
964 u_int16_t queue_num = ntohs(nfmsg->res_id);
965
966 struct nfqnl_msg_verdict_hdr *vhdr;
967 struct nfqnl_instance *queue;
968 unsigned int verdict;
969 struct nf_queue_entry *entry;
970 enum ip_conntrack_info uninitialized_var(ctinfo);
971 struct nf_conn *ct = NULL;
972
973 struct net *net = sock_net(ctnl);
974 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
975
976 queue = instance_lookup(q, queue_num);
977 if (!queue)
978 queue = verdict_instance_lookup(q, queue_num,
979 NETLINK_CB(skb).portid);
980 if (IS_ERR(queue))
981 return PTR_ERR(queue);
982
983 vhdr = verdicthdr_get(nfqa);
984 if (!vhdr)
985 return -EINVAL;
986
987 verdict = ntohl(vhdr->verdict);
988
989 entry = find_dequeue_entry(queue, ntohl(vhdr->id));
990 if (entry == NULL)
991 return -ENOENT;
992
993 if (nfqa[NFQA_CT]) {
994 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
995 if (ct && nfqa[NFQA_EXP]) {
996 nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
997 NETLINK_CB(skb).portid,
998 nlmsg_report(nlh));
999 }
1000 }
1001
1002 if (nfqa[NFQA_PAYLOAD]) {
1003 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1004 int diff = payload_len - entry->skb->len;
1005
1006 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1007 payload_len, entry, diff) < 0)
1008 verdict = NF_DROP;
1009
1010 if (ct)
1011 nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
1012 }
1013
1014 if (nfqa[NFQA_MARK])
1015 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1016
1017 nf_reinject(entry, verdict);
1018 return 0;
1019}
1020
1021static int
1022nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1023 const struct nlmsghdr *nlh,
1024 const struct nlattr * const nfqa[])
1025{
1026 return -ENOTSUPP;
1027}
1028
1029static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1030 [NFQA_CFG_CMD] = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1031 [NFQA_CFG_PARAMS] = { .len = sizeof(struct nfqnl_msg_config_params) },
1032};
1033
1034static const struct nf_queue_handler nfqh = {
1035 .outfn = &nfqnl_enqueue_packet,
1036};
1037
1038static int
1039nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1040 const struct nlmsghdr *nlh,
1041 const struct nlattr * const nfqa[])
1042{
1043 struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1044 u_int16_t queue_num = ntohs(nfmsg->res_id);
1045 struct nfqnl_instance *queue;
1046 struct nfqnl_msg_config_cmd *cmd = NULL;
1047 struct net *net = sock_net(ctnl);
1048 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1049 int ret = 0;
1050
1051 if (nfqa[NFQA_CFG_CMD]) {
1052 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1053
1054 /* Obsolete commands without queue context */
1055 switch (cmd->command) {
1056 case NFQNL_CFG_CMD_PF_BIND: return 0;
1057 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1058 }
1059 }
1060
1061 rcu_read_lock();
1062 queue = instance_lookup(q, queue_num);
1063 if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1064 ret = -EPERM;
1065 goto err_out_unlock;
1066 }
1067
1068 if (cmd != NULL) {
1069 switch (cmd->command) {
1070 case NFQNL_CFG_CMD_BIND:
1071 if (queue) {
1072 ret = -EBUSY;
1073 goto err_out_unlock;
1074 }
1075 queue = instance_create(q, queue_num,
1076 NETLINK_CB(skb).portid);
1077 if (IS_ERR(queue)) {
1078 ret = PTR_ERR(queue);
1079 goto err_out_unlock;
1080 }
1081 break;
1082 case NFQNL_CFG_CMD_UNBIND:
1083 if (!queue) {
1084 ret = -ENODEV;
1085 goto err_out_unlock;
1086 }
1087 instance_destroy(q, queue);
1088 break;
1089 case NFQNL_CFG_CMD_PF_BIND:
1090 case NFQNL_CFG_CMD_PF_UNBIND:
1091 break;
1092 default:
1093 ret = -ENOTSUPP;
1094 break;
1095 }
1096 }
1097
1098 if (nfqa[NFQA_CFG_PARAMS]) {
1099 struct nfqnl_msg_config_params *params;
1100
1101 if (!queue) {
1102 ret = -ENODEV;
1103 goto err_out_unlock;
1104 }
1105 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1106 nfqnl_set_mode(queue, params->copy_mode,
1107 ntohl(params->copy_range));
1108 }
1109
1110 if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1111 __be32 *queue_maxlen;
1112
1113 if (!queue) {
1114 ret = -ENODEV;
1115 goto err_out_unlock;
1116 }
1117 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1118 spin_lock_bh(&queue->lock);
1119 queue->queue_maxlen = ntohl(*queue_maxlen);
1120 spin_unlock_bh(&queue->lock);
1121 }
1122
1123 if (nfqa[NFQA_CFG_FLAGS]) {
1124 __u32 flags, mask;
1125
1126 if (!queue) {
1127 ret = -ENODEV;
1128 goto err_out_unlock;
1129 }
1130
1131 if (!nfqa[NFQA_CFG_MASK]) {
1132 /* A mask is needed to specify which flags are being
1133 * changed.
1134 */
1135 ret = -EINVAL;
1136 goto err_out_unlock;
1137 }
1138
1139 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1140 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1141
1142 if (flags >= NFQA_CFG_F_MAX) {
1143 ret = -EOPNOTSUPP;
1144 goto err_out_unlock;
1145 }
1146
1147 spin_lock_bh(&queue->lock);
1148 queue->flags &= ~mask;
1149 queue->flags |= flags & mask;
1150 spin_unlock_bh(&queue->lock);
1151 }
1152
1153err_out_unlock:
1154 rcu_read_unlock();
1155 return ret;
1156}
1157
1158static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1159 [NFQNL_MSG_PACKET] = { .call_rcu = nfqnl_recv_unsupp,
1160 .attr_count = NFQA_MAX, },
1161 [NFQNL_MSG_VERDICT] = { .call_rcu = nfqnl_recv_verdict,
1162 .attr_count = NFQA_MAX,
1163 .policy = nfqa_verdict_policy },
1164 [NFQNL_MSG_CONFIG] = { .call = nfqnl_recv_config,
1165 .attr_count = NFQA_CFG_MAX,
1166 .policy = nfqa_cfg_policy },
1167 [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1168 .attr_count = NFQA_MAX,
1169 .policy = nfqa_verdict_batch_policy },
1170};
1171
1172static const struct nfnetlink_subsystem nfqnl_subsys = {
1173 .name = "nf_queue",
1174 .subsys_id = NFNL_SUBSYS_QUEUE,
1175 .cb_count = NFQNL_MSG_MAX,
1176 .cb = nfqnl_cb,
1177};
1178
1179#ifdef CONFIG_PROC_FS
1180struct iter_state {
1181 struct seq_net_private p;
1182 unsigned int bucket;
1183};
1184
1185static struct hlist_node *get_first(struct seq_file *seq)
1186{
1187 struct iter_state *st = seq->private;
1188 struct net *net;
1189 struct nfnl_queue_net *q;
1190
1191 if (!st)
1192 return NULL;
1193
1194 net = seq_file_net(seq);
1195 q = nfnl_queue_pernet(net);
1196 for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1197 if (!hlist_empty(&q->instance_table[st->bucket]))
1198 return q->instance_table[st->bucket].first;
1199 }
1200 return NULL;
1201}
1202
1203static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1204{
1205 struct iter_state *st = seq->private;
1206 struct net *net = seq_file_net(seq);
1207
1208 h = h->next;
1209 while (!h) {
1210 struct nfnl_queue_net *q;
1211
1212 if (++st->bucket >= INSTANCE_BUCKETS)
1213 return NULL;
1214
1215 q = nfnl_queue_pernet(net);
1216 h = q->instance_table[st->bucket].first;
1217 }
1218 return h;
1219}
1220
1221static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1222{
1223 struct hlist_node *head;
1224 head = get_first(seq);
1225
1226 if (head)
1227 while (pos && (head = get_next(seq, head)))
1228 pos--;
1229 return pos ? NULL : head;
1230}
1231
1232static void *seq_start(struct seq_file *s, loff_t *pos)
1233 __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1234{
1235 spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1236 return get_idx(s, *pos);
1237}
1238
1239static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1240{
1241 (*pos)++;
1242 return get_next(s, v);
1243}
1244
1245static void seq_stop(struct seq_file *s, void *v)
1246 __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1247{
1248 spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1249}
1250
1251static int seq_show(struct seq_file *s, void *v)
1252{
1253 const struct nfqnl_instance *inst = v;
1254
1255 seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1256 inst->queue_num,
1257 inst->peer_portid, inst->queue_total,
1258 inst->copy_mode, inst->copy_range,
1259 inst->queue_dropped, inst->queue_user_dropped,
1260 inst->id_sequence, 1);
1261 return seq_has_overflowed(s);
1262}
1263
1264static const struct seq_operations nfqnl_seq_ops = {
1265 .start = seq_start,
1266 .next = seq_next,
1267 .stop = seq_stop,
1268 .show = seq_show,
1269};
1270
1271static int nfqnl_open(struct inode *inode, struct file *file)
1272{
1273 return seq_open_net(inode, file, &nfqnl_seq_ops,
1274 sizeof(struct iter_state));
1275}
1276
1277static const struct file_operations nfqnl_file_ops = {
1278 .owner = THIS_MODULE,
1279 .open = nfqnl_open,
1280 .read = seq_read,
1281 .llseek = seq_lseek,
1282 .release = seq_release_net,
1283};
1284
1285#endif /* PROC_FS */
1286
1287static int __net_init nfnl_queue_net_init(struct net *net)
1288{
1289 unsigned int i;
1290 struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1291
1292 for (i = 0; i < INSTANCE_BUCKETS; i++)
1293 INIT_HLIST_HEAD(&q->instance_table[i]);
1294
1295 spin_lock_init(&q->instances_lock);
1296
1297#ifdef CONFIG_PROC_FS
1298 if (!proc_create("nfnetlink_queue", 0440,
1299 net->nf.proc_netfilter, &nfqnl_file_ops))
1300 return -ENOMEM;
1301#endif
1302 return 0;
1303}
1304
1305static void __net_exit nfnl_queue_net_exit(struct net *net)
1306{
1307#ifdef CONFIG_PROC_FS
1308 remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1309#endif
1310}
1311
1312static struct pernet_operations nfnl_queue_net_ops = {
1313 .init = nfnl_queue_net_init,
1314 .exit = nfnl_queue_net_exit,
1315 .id = &nfnl_queue_net_id,
1316 .size = sizeof(struct nfnl_queue_net),
1317};
1318
1319static int __init nfnetlink_queue_init(void)
1320{
1321 int status = -ENOMEM;
1322
1323 netlink_register_notifier(&nfqnl_rtnl_notifier);
1324 status = nfnetlink_subsys_register(&nfqnl_subsys);
1325 if (status < 0) {
1326 pr_err("nf_queue: failed to create netlink socket\n");
1327 goto cleanup_netlink_notifier;
1328 }
1329
1330 status = register_pernet_subsys(&nfnl_queue_net_ops);
1331 if (status < 0) {
1332 pr_err("nf_queue: failed to register pernet ops\n");
1333 goto cleanup_subsys;
1334 }
1335 register_netdevice_notifier(&nfqnl_dev_notifier);
1336 nf_register_queue_handler(&nfqh);
1337 return status;
1338
1339cleanup_subsys:
1340 nfnetlink_subsys_unregister(&nfqnl_subsys);
1341cleanup_netlink_notifier:
1342 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1343 return status;
1344}
1345
1346static void __exit nfnetlink_queue_fini(void)
1347{
1348 nf_unregister_queue_handler();
1349 unregister_netdevice_notifier(&nfqnl_dev_notifier);
1350 unregister_pernet_subsys(&nfnl_queue_net_ops);
1351 nfnetlink_subsys_unregister(&nfqnl_subsys);
1352 netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1353
1354 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1355}
1356
1357MODULE_DESCRIPTION("netfilter packet queue handler");
1358MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1359MODULE_LICENSE("GPL");
1360MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1361
1362module_init(nfnetlink_queue_init);
1363module_exit(nfnetlink_queue_fini);