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Linux/net/netfilter/nfnetlink_queue.c

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  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/netfilter/nf_conntrack_common.h>
 32 #include <linux/list.h>
 33 #include <net/sock.h>
 34 #include <net/tcp_states.h>
 35 #include <net/netfilter/nf_queue.h>
 36 #include <net/netns/generic.h>
 37 
 38 #include <linux/atomic.h>
 39 
 40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 41 #include "../bridge/br_private.h"
 42 #endif
 43 
 44 #define NFQNL_QMAX_DEFAULT 1024
 45 
 46 /* 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 
 54 struct nfqnl_instance {
 55         struct hlist_node hlist;                /* global list of queues */
 56         struct rcu_head rcu;
 57 
 58         u32 peer_portid;
 59         unsigned int queue_maxlen;
 60         unsigned int copy_range;
 61         unsigned int queue_dropped;
 62         unsigned int queue_user_dropped;
 63 
 64 
 65         u_int16_t queue_num;                    /* 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    ____cacheline_aligned_in_smp;
 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 
 78 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
 79 
 80 static unsigned int nfnl_queue_net_id __read_mostly;
 81 
 82 #define INSTANCE_BUCKETS        16
 83 struct nfnl_queue_net {
 84         spinlock_t instances_lock;
 85         struct hlist_head instance_table[INSTANCE_BUCKETS];
 86 };
 87 
 88 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
 89 {
 90         return net_generic(net, nfnl_queue_net_id);
 91 }
 92 
 93 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
 94 {
 95         return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
 96 }
 97 
 98 static struct nfqnl_instance *
 99 instance_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 
112 static struct nfqnl_instance *
113 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
114 {
115         struct nfqnl_instance *inst;
116         unsigned int h;
117         int err;
118 
119         spin_lock(&q->instances_lock);
120         if (instance_lookup(q, queue_num)) {
121                 err = -EEXIST;
122                 goto out_unlock;
123         }
124 
125         inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
126         if (!inst) {
127                 err = -ENOMEM;
128                 goto out_unlock;
129         }
130 
131         inst->queue_num = queue_num;
132         inst->peer_portid = portid;
133         inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
134         inst->copy_range = NFQNL_MAX_COPY_RANGE;
135         inst->copy_mode = NFQNL_COPY_NONE;
136         spin_lock_init(&inst->lock);
137         INIT_LIST_HEAD(&inst->queue_list);
138 
139         if (!try_module_get(THIS_MODULE)) {
140                 err = -EAGAIN;
141                 goto out_free;
142         }
143 
144         h = instance_hashfn(queue_num);
145         hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
146 
147         spin_unlock(&q->instances_lock);
148 
149         return inst;
150 
151 out_free:
152         kfree(inst);
153 out_unlock:
154         spin_unlock(&q->instances_lock);
155         return ERR_PTR(err);
156 }
157 
158 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
159                         unsigned long data);
160 
161 static void
162 instance_destroy_rcu(struct rcu_head *head)
163 {
164         struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
165                                                    rcu);
166 
167         nfqnl_flush(inst, NULL, 0);
168         kfree(inst);
169         module_put(THIS_MODULE);
170 }
171 
172 static void
173 __instance_destroy(struct nfqnl_instance *inst)
174 {
175         hlist_del_rcu(&inst->hlist);
176         call_rcu(&inst->rcu, instance_destroy_rcu);
177 }
178 
179 static void
180 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
181 {
182         spin_lock(&q->instances_lock);
183         __instance_destroy(inst);
184         spin_unlock(&q->instances_lock);
185 }
186 
187 static inline void
188 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
189 {
190        list_add_tail(&entry->list, &queue->queue_list);
191        queue->queue_total++;
192 }
193 
194 static void
195 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
196 {
197         list_del(&entry->list);
198         queue->queue_total--;
199 }
200 
201 static struct nf_queue_entry *
202 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
203 {
204         struct nf_queue_entry *entry = NULL, *i;
205 
206         spin_lock_bh(&queue->lock);
207 
208         list_for_each_entry(i, &queue->queue_list, list) {
209                 if (i->id == id) {
210                         entry = i;
211                         break;
212                 }
213         }
214 
215         if (entry)
216                 __dequeue_entry(queue, entry);
217 
218         spin_unlock_bh(&queue->lock);
219 
220         return entry;
221 }
222 
223 static void
224 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
225 {
226         struct nf_queue_entry *entry, *next;
227 
228         spin_lock_bh(&queue->lock);
229         list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
230                 if (!cmpfn || cmpfn(entry, data)) {
231                         list_del(&entry->list);
232                         queue->queue_total--;
233                         nf_reinject(entry, NF_DROP);
234                 }
235         }
236         spin_unlock_bh(&queue->lock);
237 }
238 
239 static int
240 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
241                       bool csum_verify)
242 {
243         __u32 flags = 0;
244 
245         if (packet->ip_summed == CHECKSUM_PARTIAL)
246                 flags = NFQA_SKB_CSUMNOTREADY;
247         else if (csum_verify)
248                 flags = NFQA_SKB_CSUM_NOTVERIFIED;
249 
250         if (skb_is_gso(packet))
251                 flags |= NFQA_SKB_GSO;
252 
253         return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
254 }
255 
256 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
257 {
258         const struct cred *cred;
259 
260         if (!sk_fullsock(sk))
261                 return 0;
262 
263         read_lock_bh(&sk->sk_callback_lock);
264         if (sk->sk_socket && sk->sk_socket->file) {
265                 cred = sk->sk_socket->file->f_cred;
266                 if (nla_put_be32(skb, NFQA_UID,
267                     htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
268                         goto nla_put_failure;
269                 if (nla_put_be32(skb, NFQA_GID,
270                     htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
271                         goto nla_put_failure;
272         }
273         read_unlock_bh(&sk->sk_callback_lock);
274         return 0;
275 
276 nla_put_failure:
277         read_unlock_bh(&sk->sk_callback_lock);
278         return -1;
279 }
280 
281 static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
282 {
283         u32 seclen = 0;
284 #if IS_ENABLED(CONFIG_NETWORK_SECMARK)
285         if (!skb || !sk_fullsock(skb->sk))
286                 return 0;
287 
288         read_lock_bh(&skb->sk->sk_callback_lock);
289 
290         if (skb->secmark)
291                 security_secid_to_secctx(skb->secmark, secdata, &seclen);
292 
293         read_unlock_bh(&skb->sk->sk_callback_lock);
294 #endif
295         return seclen;
296 }
297 
298 static u32 nfqnl_get_bridge_size(struct nf_queue_entry *entry)
299 {
300         struct sk_buff *entskb = entry->skb;
301         u32 nlalen = 0;
302 
303         if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
304                 return 0;
305 
306         if (skb_vlan_tag_present(entskb))
307                 nlalen += nla_total_size(nla_total_size(sizeof(__be16)) +
308                                          nla_total_size(sizeof(__be16)));
309 
310         if (entskb->network_header > entskb->mac_header)
311                 nlalen += nla_total_size((entskb->network_header -
312                                           entskb->mac_header));
313 
314         return nlalen;
315 }
316 
317 static int nfqnl_put_bridge(struct nf_queue_entry *entry, struct sk_buff *skb)
318 {
319         struct sk_buff *entskb = entry->skb;
320 
321         if (entry->state.pf != PF_BRIDGE || !skb_mac_header_was_set(entskb))
322                 return 0;
323 
324         if (skb_vlan_tag_present(entskb)) {
325                 struct nlattr *nest;
326 
327                 nest = nla_nest_start(skb, NFQA_VLAN | NLA_F_NESTED);
328                 if (!nest)
329                         goto nla_put_failure;
330 
331                 if (nla_put_be16(skb, NFQA_VLAN_TCI, htons(entskb->vlan_tci)) ||
332                     nla_put_be16(skb, NFQA_VLAN_PROTO, entskb->vlan_proto))
333                         goto nla_put_failure;
334 
335                 nla_nest_end(skb, nest);
336         }
337 
338         if (entskb->mac_header < entskb->network_header) {
339                 int len = (int)(entskb->network_header - entskb->mac_header);
340 
341                 if (nla_put(skb, NFQA_L2HDR, len, skb_mac_header(entskb)))
342                         goto nla_put_failure;
343         }
344 
345         return 0;
346 
347 nla_put_failure:
348         return -1;
349 }
350 
351 static struct sk_buff *
352 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
353                            struct nf_queue_entry *entry,
354                            __be32 **packet_id_ptr)
355 {
356         size_t size;
357         size_t data_len = 0, cap_len = 0;
358         unsigned int hlen = 0;
359         struct sk_buff *skb;
360         struct nlattr *nla;
361         struct nfqnl_msg_packet_hdr *pmsg;
362         struct nlmsghdr *nlh;
363         struct nfgenmsg *nfmsg;
364         struct sk_buff *entskb = entry->skb;
365         struct net_device *indev;
366         struct net_device *outdev;
367         struct nf_conn *ct = NULL;
368         enum ip_conntrack_info uninitialized_var(ctinfo);
369         struct nfnl_ct_hook *nfnl_ct;
370         bool csum_verify;
371         char *secdata = NULL;
372         u32 seclen = 0;
373 
374         size =    nlmsg_total_size(sizeof(struct nfgenmsg))
375                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
376                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
377                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
378 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
379                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
380                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
381 #endif
382                 + nla_total_size(sizeof(u_int32_t))     /* mark */
383                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
384                 + nla_total_size(sizeof(u_int32_t))     /* skbinfo */
385                 + nla_total_size(sizeof(u_int32_t));    /* cap_len */
386 
387         if (entskb->tstamp)
388                 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
389 
390         size += nfqnl_get_bridge_size(entry);
391 
392         if (entry->state.hook <= NF_INET_FORWARD ||
393            (entry->state.hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
394                 csum_verify = !skb_csum_unnecessary(entskb);
395         else
396                 csum_verify = false;
397 
398         outdev = entry->state.out;
399 
400         switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
401         case NFQNL_COPY_META:
402         case NFQNL_COPY_NONE:
403                 break;
404 
405         case NFQNL_COPY_PACKET:
406                 if (!(queue->flags & NFQA_CFG_F_GSO) &&
407                     entskb->ip_summed == CHECKSUM_PARTIAL &&
408                     skb_checksum_help(entskb))
409                         return NULL;
410 
411                 data_len = ACCESS_ONCE(queue->copy_range);
412                 if (data_len > entskb->len)
413                         data_len = entskb->len;
414 
415                 hlen = skb_zerocopy_headlen(entskb);
416                 hlen = min_t(unsigned int, hlen, data_len);
417                 size += sizeof(struct nlattr) + hlen;
418                 cap_len = entskb->len;
419                 break;
420         }
421 
422         nfnl_ct = rcu_dereference(nfnl_ct_hook);
423 
424         if (queue->flags & NFQA_CFG_F_CONNTRACK) {
425                 if (nfnl_ct != NULL) {
426                         ct = nfnl_ct->get_ct(entskb, &ctinfo);
427                         if (ct != NULL)
428                                 size += nfnl_ct->build_size(ct);
429                 }
430         }
431 
432         if (queue->flags & NFQA_CFG_F_UID_GID) {
433                 size +=  (nla_total_size(sizeof(u_int32_t))     /* uid */
434                         + nla_total_size(sizeof(u_int32_t)));   /* gid */
435         }
436 
437         if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
438                 seclen = nfqnl_get_sk_secctx(entskb, &secdata);
439                 if (seclen)
440                         size += nla_total_size(seclen);
441         }
442 
443         skb = alloc_skb(size, GFP_ATOMIC);
444         if (!skb) {
445                 skb_tx_error(entskb);
446                 return NULL;
447         }
448 
449         nlh = nlmsg_put(skb, 0, 0,
450                         NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
451                         sizeof(struct nfgenmsg), 0);
452         if (!nlh) {
453                 skb_tx_error(entskb);
454                 kfree_skb(skb);
455                 return NULL;
456         }
457         nfmsg = nlmsg_data(nlh);
458         nfmsg->nfgen_family = entry->state.pf;
459         nfmsg->version = NFNETLINK_V0;
460         nfmsg->res_id = htons(queue->queue_num);
461 
462         nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
463         pmsg = nla_data(nla);
464         pmsg->hw_protocol       = entskb->protocol;
465         pmsg->hook              = entry->state.hook;
466         *packet_id_ptr          = &pmsg->packet_id;
467 
468         indev = entry->state.in;
469         if (indev) {
470 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
471                 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
472                         goto nla_put_failure;
473 #else
474                 if (entry->state.pf == PF_BRIDGE) {
475                         /* Case 1: indev is physical input device, we need to
476                          * look for bridge group (when called from
477                          * netfilter_bridge) */
478                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
479                                          htonl(indev->ifindex)) ||
480                         /* this is the bridge group "brX" */
481                         /* rcu_read_lock()ed by __nf_queue */
482                             nla_put_be32(skb, NFQA_IFINDEX_INDEV,
483                                          htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
484                                 goto nla_put_failure;
485                 } else {
486                         int physinif;
487 
488                         /* Case 2: indev is bridge group, we need to look for
489                          * physical device (when called from ipv4) */
490                         if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
491                                          htonl(indev->ifindex)))
492                                 goto nla_put_failure;
493 
494                         physinif = nf_bridge_get_physinif(entskb);
495                         if (physinif &&
496                             nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
497                                          htonl(physinif)))
498                                 goto nla_put_failure;
499                 }
500 #endif
501         }
502 
503         if (outdev) {
504 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
505                 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
506                         goto nla_put_failure;
507 #else
508                 if (entry->state.pf == PF_BRIDGE) {
509                         /* Case 1: outdev is physical output device, we need to
510                          * look for bridge group (when called from
511                          * netfilter_bridge) */
512                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
513                                          htonl(outdev->ifindex)) ||
514                         /* this is the bridge group "brX" */
515                         /* rcu_read_lock()ed by __nf_queue */
516                             nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
517                                          htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
518                                 goto nla_put_failure;
519                 } else {
520                         int physoutif;
521 
522                         /* Case 2: outdev is bridge group, we need to look for
523                          * physical output device (when called from ipv4) */
524                         if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
525                                          htonl(outdev->ifindex)))
526                                 goto nla_put_failure;
527 
528                         physoutif = nf_bridge_get_physoutif(entskb);
529                         if (physoutif &&
530                             nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
531                                          htonl(physoutif)))
532                                 goto nla_put_failure;
533                 }
534 #endif
535         }
536 
537         if (entskb->mark &&
538             nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
539                 goto nla_put_failure;
540 
541         if (indev && entskb->dev &&
542             entskb->mac_header != entskb->network_header) {
543                 struct nfqnl_msg_packet_hw phw;
544                 int len;
545 
546                 memset(&phw, 0, sizeof(phw));
547                 len = dev_parse_header(entskb, phw.hw_addr);
548                 if (len) {
549                         phw.hw_addrlen = htons(len);
550                         if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
551                                 goto nla_put_failure;
552                 }
553         }
554 
555         if (nfqnl_put_bridge(entry, skb) < 0)
556                 goto nla_put_failure;
557 
558         if (entskb->tstamp) {
559                 struct nfqnl_msg_packet_timestamp ts;
560                 struct timespec64 kts = ktime_to_timespec64(entskb->tstamp);
561 
562                 ts.sec = cpu_to_be64(kts.tv_sec);
563                 ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
564 
565                 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
566                         goto nla_put_failure;
567         }
568 
569         if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
570             nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
571                 goto nla_put_failure;
572 
573         if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
574                 goto nla_put_failure;
575 
576         if (ct && nfnl_ct->build(skb, ct, ctinfo, NFQA_CT, NFQA_CT_INFO) < 0)
577                 goto nla_put_failure;
578 
579         if (cap_len > data_len &&
580             nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
581                 goto nla_put_failure;
582 
583         if (nfqnl_put_packet_info(skb, entskb, csum_verify))
584                 goto nla_put_failure;
585 
586         if (data_len) {
587                 struct nlattr *nla;
588 
589                 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
590                         goto nla_put_failure;
591 
592                 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
593                 nla->nla_type = NFQA_PAYLOAD;
594                 nla->nla_len = nla_attr_size(data_len);
595 
596                 if (skb_zerocopy(skb, entskb, data_len, hlen))
597                         goto nla_put_failure;
598         }
599 
600         nlh->nlmsg_len = skb->len;
601         return skb;
602 
603 nla_put_failure:
604         skb_tx_error(entskb);
605         kfree_skb(skb);
606         net_err_ratelimited("nf_queue: error creating packet message\n");
607         return NULL;
608 }
609 
610 static int
611 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
612                         struct nf_queue_entry *entry)
613 {
614         struct sk_buff *nskb;
615         int err = -ENOBUFS;
616         __be32 *packet_id_ptr;
617         int failopen = 0;
618 
619         nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
620         if (nskb == NULL) {
621                 err = -ENOMEM;
622                 goto err_out;
623         }
624         spin_lock_bh(&queue->lock);
625 
626         if (queue->queue_total >= queue->queue_maxlen) {
627                 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
628                         failopen = 1;
629                         err = 0;
630                 } else {
631                         queue->queue_dropped++;
632                         net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
633                                              queue->queue_total);
634                 }
635                 goto err_out_free_nskb;
636         }
637         entry->id = ++queue->id_sequence;
638         *packet_id_ptr = htonl(entry->id);
639 
640         /* nfnetlink_unicast will either free the nskb or add it to a socket */
641         err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
642         if (err < 0) {
643                 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
644                         failopen = 1;
645                         err = 0;
646                 } else {
647                         queue->queue_user_dropped++;
648                 }
649                 goto err_out_unlock;
650         }
651 
652         __enqueue_entry(queue, entry);
653 
654         spin_unlock_bh(&queue->lock);
655         return 0;
656 
657 err_out_free_nskb:
658         kfree_skb(nskb);
659 err_out_unlock:
660         spin_unlock_bh(&queue->lock);
661         if (failopen)
662                 nf_reinject(entry, NF_ACCEPT);
663 err_out:
664         return err;
665 }
666 
667 static struct nf_queue_entry *
668 nf_queue_entry_dup(struct nf_queue_entry *e)
669 {
670         struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
671         if (entry)
672                 nf_queue_entry_get_refs(entry);
673         return entry;
674 }
675 
676 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
677 /* When called from bridge netfilter, skb->data must point to MAC header
678  * before calling skb_gso_segment(). Else, original MAC header is lost
679  * and segmented skbs will be sent to wrong destination.
680  */
681 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
682 {
683         if (skb->nf_bridge)
684                 __skb_push(skb, skb->network_header - skb->mac_header);
685 }
686 
687 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
688 {
689         if (skb->nf_bridge)
690                 __skb_pull(skb, skb->network_header - skb->mac_header);
691 }
692 #else
693 #define nf_bridge_adjust_skb_data(s) do {} while (0)
694 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
695 #endif
696 
697 static void free_entry(struct nf_queue_entry *entry)
698 {
699         nf_queue_entry_release_refs(entry);
700         kfree(entry);
701 }
702 
703 static int
704 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
705                            struct sk_buff *skb, struct nf_queue_entry *entry)
706 {
707         int ret = -ENOMEM;
708         struct nf_queue_entry *entry_seg;
709 
710         nf_bridge_adjust_segmented_data(skb);
711 
712         if (skb->next == NULL) { /* last packet, no need to copy entry */
713                 struct sk_buff *gso_skb = entry->skb;
714                 entry->skb = skb;
715                 ret = __nfqnl_enqueue_packet(net, queue, entry);
716                 if (ret)
717                         entry->skb = gso_skb;
718                 return ret;
719         }
720 
721         skb->next = NULL;
722 
723         entry_seg = nf_queue_entry_dup(entry);
724         if (entry_seg) {
725                 entry_seg->skb = skb;
726                 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
727                 if (ret)
728                         free_entry(entry_seg);
729         }
730         return ret;
731 }
732 
733 static int
734 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
735 {
736         unsigned int queued;
737         struct nfqnl_instance *queue;
738         struct sk_buff *skb, *segs;
739         int err = -ENOBUFS;
740         struct net *net = entry->state.net;
741         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
742 
743         /* rcu_read_lock()ed by nf_hook_thresh */
744         queue = instance_lookup(q, queuenum);
745         if (!queue)
746                 return -ESRCH;
747 
748         if (queue->copy_mode == NFQNL_COPY_NONE)
749                 return -EINVAL;
750 
751         skb = entry->skb;
752 
753         switch (entry->state.pf) {
754         case NFPROTO_IPV4:
755                 skb->protocol = htons(ETH_P_IP);
756                 break;
757         case NFPROTO_IPV6:
758                 skb->protocol = htons(ETH_P_IPV6);
759                 break;
760         }
761 
762         if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
763                 return __nfqnl_enqueue_packet(net, queue, entry);
764 
765         nf_bridge_adjust_skb_data(skb);
766         segs = skb_gso_segment(skb, 0);
767         /* Does not use PTR_ERR to limit the number of error codes that can be
768          * returned by nf_queue.  For instance, callers rely on -ESRCH to
769          * mean 'ignore this hook'.
770          */
771         if (IS_ERR_OR_NULL(segs))
772                 goto out_err;
773         queued = 0;
774         err = 0;
775         do {
776                 struct sk_buff *nskb = segs->next;
777                 if (err == 0)
778                         err = __nfqnl_enqueue_packet_gso(net, queue,
779                                                         segs, entry);
780                 if (err == 0)
781                         queued++;
782                 else
783                         kfree_skb(segs);
784                 segs = nskb;
785         } while (segs);
786 
787         if (queued) {
788                 if (err) /* some segments are already queued */
789                         free_entry(entry);
790                 kfree_skb(skb);
791                 return 0;
792         }
793  out_err:
794         nf_bridge_adjust_segmented_data(skb);
795         return err;
796 }
797 
798 static int
799 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
800 {
801         struct sk_buff *nskb;
802 
803         if (diff < 0) {
804                 if (pskb_trim(e->skb, data_len))
805                         return -ENOMEM;
806         } else if (diff > 0) {
807                 if (data_len > 0xFFFF)
808                         return -EINVAL;
809                 if (diff > skb_tailroom(e->skb)) {
810                         nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
811                                                diff, GFP_ATOMIC);
812                         if (!nskb) {
813                                 printk(KERN_WARNING "nf_queue: OOM "
814                                       "in mangle, dropping packet\n");
815                                 return -ENOMEM;
816                         }
817                         kfree_skb(e->skb);
818                         e->skb = nskb;
819                 }
820                 skb_put(e->skb, diff);
821         }
822         if (!skb_make_writable(e->skb, data_len))
823                 return -ENOMEM;
824         skb_copy_to_linear_data(e->skb, data, data_len);
825         e->skb->ip_summed = CHECKSUM_NONE;
826         return 0;
827 }
828 
829 static int
830 nfqnl_set_mode(struct nfqnl_instance *queue,
831                unsigned char mode, unsigned int range)
832 {
833         int status = 0;
834 
835         spin_lock_bh(&queue->lock);
836         switch (mode) {
837         case NFQNL_COPY_NONE:
838         case NFQNL_COPY_META:
839                 queue->copy_mode = mode;
840                 queue->copy_range = 0;
841                 break;
842 
843         case NFQNL_COPY_PACKET:
844                 queue->copy_mode = mode;
845                 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
846                         queue->copy_range = NFQNL_MAX_COPY_RANGE;
847                 else
848                         queue->copy_range = range;
849                 break;
850 
851         default:
852                 status = -EINVAL;
853 
854         }
855         spin_unlock_bh(&queue->lock);
856 
857         return status;
858 }
859 
860 static int
861 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
862 {
863         if (entry->state.in)
864                 if (entry->state.in->ifindex == ifindex)
865                         return 1;
866         if (entry->state.out)
867                 if (entry->state.out->ifindex == ifindex)
868                         return 1;
869 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
870         if (entry->skb->nf_bridge) {
871                 int physinif, physoutif;
872 
873                 physinif = nf_bridge_get_physinif(entry->skb);
874                 physoutif = nf_bridge_get_physoutif(entry->skb);
875 
876                 if (physinif == ifindex || physoutif == ifindex)
877                         return 1;
878         }
879 #endif
880         return 0;
881 }
882 
883 /* drop all packets with either indev or outdev == ifindex from all queue
884  * instances */
885 static void
886 nfqnl_dev_drop(struct net *net, int ifindex)
887 {
888         int i;
889         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
890 
891         rcu_read_lock();
892 
893         for (i = 0; i < INSTANCE_BUCKETS; i++) {
894                 struct nfqnl_instance *inst;
895                 struct hlist_head *head = &q->instance_table[i];
896 
897                 hlist_for_each_entry_rcu(inst, head, hlist)
898                         nfqnl_flush(inst, dev_cmp, ifindex);
899         }
900 
901         rcu_read_unlock();
902 }
903 
904 static int
905 nfqnl_rcv_dev_event(struct notifier_block *this,
906                     unsigned long event, void *ptr)
907 {
908         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
909 
910         /* Drop any packets associated with the downed device */
911         if (event == NETDEV_DOWN)
912                 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
913         return NOTIFY_DONE;
914 }
915 
916 static struct notifier_block nfqnl_dev_notifier = {
917         .notifier_call  = nfqnl_rcv_dev_event,
918 };
919 
920 static int nf_hook_cmp(struct nf_queue_entry *entry, unsigned long entry_ptr)
921 {
922         return rcu_access_pointer(entry->hook) ==
923                 (struct nf_hook_entry *)entry_ptr;
924 }
925 
926 static void nfqnl_nf_hook_drop(struct net *net,
927                                const struct nf_hook_entry *hook)
928 {
929         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
930         int i;
931 
932         rcu_read_lock();
933         for (i = 0; i < INSTANCE_BUCKETS; i++) {
934                 struct nfqnl_instance *inst;
935                 struct hlist_head *head = &q->instance_table[i];
936 
937                 hlist_for_each_entry_rcu(inst, head, hlist)
938                         nfqnl_flush(inst, nf_hook_cmp, (unsigned long)hook);
939         }
940         rcu_read_unlock();
941 }
942 
943 static int
944 nfqnl_rcv_nl_event(struct notifier_block *this,
945                    unsigned long event, void *ptr)
946 {
947         struct netlink_notify *n = ptr;
948         struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
949 
950         if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
951                 int i;
952 
953                 /* destroy all instances for this portid */
954                 spin_lock(&q->instances_lock);
955                 for (i = 0; i < INSTANCE_BUCKETS; i++) {
956                         struct hlist_node *t2;
957                         struct nfqnl_instance *inst;
958                         struct hlist_head *head = &q->instance_table[i];
959 
960                         hlist_for_each_entry_safe(inst, t2, head, hlist) {
961                                 if (n->portid == inst->peer_portid)
962                                         __instance_destroy(inst);
963                         }
964                 }
965                 spin_unlock(&q->instances_lock);
966         }
967         return NOTIFY_DONE;
968 }
969 
970 static struct notifier_block nfqnl_rtnl_notifier = {
971         .notifier_call  = nfqnl_rcv_nl_event,
972 };
973 
974 static const struct nla_policy nfqa_vlan_policy[NFQA_VLAN_MAX + 1] = {
975         [NFQA_VLAN_TCI]         = { .type = NLA_U16},
976         [NFQA_VLAN_PROTO]       = { .type = NLA_U16},
977 };
978 
979 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
980         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
981         [NFQA_MARK]             = { .type = NLA_U32 },
982         [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
983         [NFQA_CT]               = { .type = NLA_UNSPEC },
984         [NFQA_EXP]              = { .type = NLA_UNSPEC },
985         [NFQA_VLAN]             = { .type = NLA_NESTED },
986 };
987 
988 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
989         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
990         [NFQA_MARK]             = { .type = NLA_U32 },
991 };
992 
993 static struct nfqnl_instance *
994 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
995 {
996         struct nfqnl_instance *queue;
997 
998         queue = instance_lookup(q, queue_num);
999         if (!queue)
1000                 return ERR_PTR(-ENODEV);
1001 
1002         if (queue->peer_portid != nlportid)
1003                 return ERR_PTR(-EPERM);
1004 
1005         return queue;
1006 }
1007 
1008 static struct nfqnl_msg_verdict_hdr*
1009 verdicthdr_get(const struct nlattr * const nfqa[])
1010 {
1011         struct nfqnl_msg_verdict_hdr *vhdr;
1012         unsigned int verdict;
1013 
1014         if (!nfqa[NFQA_VERDICT_HDR])
1015                 return NULL;
1016 
1017         vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
1018         verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
1019         if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
1020                 return NULL;
1021         return vhdr;
1022 }
1023 
1024 static int nfq_id_after(unsigned int id, unsigned int max)
1025 {
1026         return (int)(id - max) > 0;
1027 }
1028 
1029 static int nfqnl_recv_verdict_batch(struct net *net, struct sock *ctnl,
1030                                     struct sk_buff *skb,
1031                                     const struct nlmsghdr *nlh,
1032                                     const struct nlattr * const nfqa[])
1033 {
1034         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1035         struct nf_queue_entry *entry, *tmp;
1036         unsigned int verdict, maxid;
1037         struct nfqnl_msg_verdict_hdr *vhdr;
1038         struct nfqnl_instance *queue;
1039         LIST_HEAD(batch_list);
1040         u16 queue_num = ntohs(nfmsg->res_id);
1041         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1042 
1043         queue = verdict_instance_lookup(q, queue_num,
1044                                         NETLINK_CB(skb).portid);
1045         if (IS_ERR(queue))
1046                 return PTR_ERR(queue);
1047 
1048         vhdr = verdicthdr_get(nfqa);
1049         if (!vhdr)
1050                 return -EINVAL;
1051 
1052         verdict = ntohl(vhdr->verdict);
1053         maxid = ntohl(vhdr->id);
1054 
1055         spin_lock_bh(&queue->lock);
1056 
1057         list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
1058                 if (nfq_id_after(entry->id, maxid))
1059                         break;
1060                 __dequeue_entry(queue, entry);
1061                 list_add_tail(&entry->list, &batch_list);
1062         }
1063 
1064         spin_unlock_bh(&queue->lock);
1065 
1066         if (list_empty(&batch_list))
1067                 return -ENOENT;
1068 
1069         list_for_each_entry_safe(entry, tmp, &batch_list, list) {
1070                 if (nfqa[NFQA_MARK])
1071                         entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1072                 nf_reinject(entry, verdict);
1073         }
1074         return 0;
1075 }
1076 
1077 static struct nf_conn *nfqnl_ct_parse(struct nfnl_ct_hook *nfnl_ct,
1078                                       const struct nlmsghdr *nlh,
1079                                       const struct nlattr * const nfqa[],
1080                                       struct nf_queue_entry *entry,
1081                                       enum ip_conntrack_info *ctinfo)
1082 {
1083         struct nf_conn *ct;
1084 
1085         ct = nfnl_ct->get_ct(entry->skb, ctinfo);
1086         if (ct == NULL)
1087                 return NULL;
1088 
1089         if (nfnl_ct->parse(nfqa[NFQA_CT], ct) < 0)
1090                 return NULL;
1091 
1092         if (nfqa[NFQA_EXP])
1093                 nfnl_ct->attach_expect(nfqa[NFQA_EXP], ct,
1094                                       NETLINK_CB(entry->skb).portid,
1095                                       nlmsg_report(nlh));
1096         return ct;
1097 }
1098 
1099 static int nfqa_parse_bridge(struct nf_queue_entry *entry,
1100                              const struct nlattr * const nfqa[])
1101 {
1102         if (nfqa[NFQA_VLAN]) {
1103                 struct nlattr *tb[NFQA_VLAN_MAX + 1];
1104                 int err;
1105 
1106                 err = nla_parse_nested(tb, NFQA_VLAN_MAX, nfqa[NFQA_VLAN],
1107                                        nfqa_vlan_policy);
1108                 if (err < 0)
1109                         return err;
1110 
1111                 if (!tb[NFQA_VLAN_TCI] || !tb[NFQA_VLAN_PROTO])
1112                         return -EINVAL;
1113 
1114                 entry->skb->vlan_tci = ntohs(nla_get_be16(tb[NFQA_VLAN_TCI]));
1115                 entry->skb->vlan_proto = nla_get_be16(tb[NFQA_VLAN_PROTO]);
1116         }
1117 
1118         if (nfqa[NFQA_L2HDR]) {
1119                 int mac_header_len = entry->skb->network_header -
1120                         entry->skb->mac_header;
1121 
1122                 if (mac_header_len != nla_len(nfqa[NFQA_L2HDR]))
1123                         return -EINVAL;
1124                 else if (mac_header_len > 0)
1125                         memcpy(skb_mac_header(entry->skb),
1126                                nla_data(nfqa[NFQA_L2HDR]),
1127                                mac_header_len);
1128         }
1129 
1130         return 0;
1131 }
1132 
1133 static int nfqnl_recv_verdict(struct net *net, struct sock *ctnl,
1134                               struct sk_buff *skb,
1135                               const struct nlmsghdr *nlh,
1136                               const struct nlattr * const nfqa[])
1137 {
1138         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1139         u_int16_t queue_num = ntohs(nfmsg->res_id);
1140         struct nfqnl_msg_verdict_hdr *vhdr;
1141         struct nfqnl_instance *queue;
1142         unsigned int verdict;
1143         struct nf_queue_entry *entry;
1144         enum ip_conntrack_info uninitialized_var(ctinfo);
1145         struct nfnl_ct_hook *nfnl_ct;
1146         struct nf_conn *ct = NULL;
1147         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1148         int err;
1149 
1150         queue = verdict_instance_lookup(q, queue_num,
1151                                         NETLINK_CB(skb).portid);
1152         if (IS_ERR(queue))
1153                 return PTR_ERR(queue);
1154 
1155         vhdr = verdicthdr_get(nfqa);
1156         if (!vhdr)
1157                 return -EINVAL;
1158 
1159         verdict = ntohl(vhdr->verdict);
1160 
1161         entry = find_dequeue_entry(queue, ntohl(vhdr->id));
1162         if (entry == NULL)
1163                 return -ENOENT;
1164 
1165         /* rcu lock already held from nfnl->call_rcu. */
1166         nfnl_ct = rcu_dereference(nfnl_ct_hook);
1167 
1168         if (nfqa[NFQA_CT]) {
1169                 if (nfnl_ct != NULL)
1170                         ct = nfqnl_ct_parse(nfnl_ct, nlh, nfqa, entry, &ctinfo);
1171         }
1172 
1173         if (entry->state.pf == PF_BRIDGE) {
1174                 err = nfqa_parse_bridge(entry, nfqa);
1175                 if (err < 0)
1176                         return err;
1177         }
1178 
1179         if (nfqa[NFQA_PAYLOAD]) {
1180                 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1181                 int diff = payload_len - entry->skb->len;
1182 
1183                 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1184                                  payload_len, entry, diff) < 0)
1185                         verdict = NF_DROP;
1186 
1187                 if (ct && diff)
1188                         nfnl_ct->seq_adjust(entry->skb, ct, ctinfo, diff);
1189         }
1190 
1191         if (nfqa[NFQA_MARK])
1192                 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1193 
1194         nf_reinject(entry, verdict);
1195         return 0;
1196 }
1197 
1198 static int nfqnl_recv_unsupp(struct net *net, struct sock *ctnl,
1199                              struct sk_buff *skb, const struct nlmsghdr *nlh,
1200                              const struct nlattr * const nfqa[])
1201 {
1202         return -ENOTSUPP;
1203 }
1204 
1205 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1206         [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1207         [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
1208 };
1209 
1210 static const struct nf_queue_handler nfqh = {
1211         .outfn          = &nfqnl_enqueue_packet,
1212         .nf_hook_drop   = &nfqnl_nf_hook_drop,
1213 };
1214 
1215 static int nfqnl_recv_config(struct net *net, struct sock *ctnl,
1216                              struct sk_buff *skb, const struct nlmsghdr *nlh,
1217                              const struct nlattr * const nfqa[])
1218 {
1219         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1220         u_int16_t queue_num = ntohs(nfmsg->res_id);
1221         struct nfqnl_instance *queue;
1222         struct nfqnl_msg_config_cmd *cmd = NULL;
1223         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1224         __u32 flags = 0, mask = 0;
1225         int ret = 0;
1226 
1227         if (nfqa[NFQA_CFG_CMD]) {
1228                 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1229 
1230                 /* Obsolete commands without queue context */
1231                 switch (cmd->command) {
1232                 case NFQNL_CFG_CMD_PF_BIND: return 0;
1233                 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1234                 }
1235         }
1236 
1237         /* Check if we support these flags in first place, dependencies should
1238          * be there too not to break atomicity.
1239          */
1240         if (nfqa[NFQA_CFG_FLAGS]) {
1241                 if (!nfqa[NFQA_CFG_MASK]) {
1242                         /* A mask is needed to specify which flags are being
1243                          * changed.
1244                          */
1245                         return -EINVAL;
1246                 }
1247 
1248                 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1249                 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1250 
1251                 if (flags >= NFQA_CFG_F_MAX)
1252                         return -EOPNOTSUPP;
1253 
1254 #if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
1255                 if (flags & mask & NFQA_CFG_F_SECCTX)
1256                         return -EOPNOTSUPP;
1257 #endif
1258                 if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
1259                     !rcu_access_pointer(nfnl_ct_hook)) {
1260 #ifdef CONFIG_MODULES
1261                         nfnl_unlock(NFNL_SUBSYS_QUEUE);
1262                         request_module("ip_conntrack_netlink");
1263                         nfnl_lock(NFNL_SUBSYS_QUEUE);
1264                         if (rcu_access_pointer(nfnl_ct_hook))
1265                                 return -EAGAIN;
1266 #endif
1267                         return -EOPNOTSUPP;
1268                 }
1269         }
1270 
1271         rcu_read_lock();
1272         queue = instance_lookup(q, queue_num);
1273         if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1274                 ret = -EPERM;
1275                 goto err_out_unlock;
1276         }
1277 
1278         if (cmd != NULL) {
1279                 switch (cmd->command) {
1280                 case NFQNL_CFG_CMD_BIND:
1281                         if (queue) {
1282                                 ret = -EBUSY;
1283                                 goto err_out_unlock;
1284                         }
1285                         queue = instance_create(q, queue_num,
1286                                                 NETLINK_CB(skb).portid);
1287                         if (IS_ERR(queue)) {
1288                                 ret = PTR_ERR(queue);
1289                                 goto err_out_unlock;
1290                         }
1291                         break;
1292                 case NFQNL_CFG_CMD_UNBIND:
1293                         if (!queue) {
1294                                 ret = -ENODEV;
1295                                 goto err_out_unlock;
1296                         }
1297                         instance_destroy(q, queue);
1298                         goto err_out_unlock;
1299                 case NFQNL_CFG_CMD_PF_BIND:
1300                 case NFQNL_CFG_CMD_PF_UNBIND:
1301                         break;
1302                 default:
1303                         ret = -ENOTSUPP;
1304                         goto err_out_unlock;
1305                 }
1306         }
1307 
1308         if (!queue) {
1309                 ret = -ENODEV;
1310                 goto err_out_unlock;
1311         }
1312 
1313         if (nfqa[NFQA_CFG_PARAMS]) {
1314                 struct nfqnl_msg_config_params *params =
1315                         nla_data(nfqa[NFQA_CFG_PARAMS]);
1316 
1317                 nfqnl_set_mode(queue, params->copy_mode,
1318                                 ntohl(params->copy_range));
1319         }
1320 
1321         if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1322                 __be32 *queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1323 
1324                 spin_lock_bh(&queue->lock);
1325                 queue->queue_maxlen = ntohl(*queue_maxlen);
1326                 spin_unlock_bh(&queue->lock);
1327         }
1328 
1329         if (nfqa[NFQA_CFG_FLAGS]) {
1330                 spin_lock_bh(&queue->lock);
1331                 queue->flags &= ~mask;
1332                 queue->flags |= flags & mask;
1333                 spin_unlock_bh(&queue->lock);
1334         }
1335 
1336 err_out_unlock:
1337         rcu_read_unlock();
1338         return ret;
1339 }
1340 
1341 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1342         [NFQNL_MSG_PACKET]      = { .call_rcu = nfqnl_recv_unsupp,
1343                                     .attr_count = NFQA_MAX, },
1344         [NFQNL_MSG_VERDICT]     = { .call_rcu = nfqnl_recv_verdict,
1345                                     .attr_count = NFQA_MAX,
1346                                     .policy = nfqa_verdict_policy },
1347         [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
1348                                     .attr_count = NFQA_CFG_MAX,
1349                                     .policy = nfqa_cfg_policy },
1350         [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1351                                     .attr_count = NFQA_MAX,
1352                                     .policy = nfqa_verdict_batch_policy },
1353 };
1354 
1355 static const struct nfnetlink_subsystem nfqnl_subsys = {
1356         .name           = "nf_queue",
1357         .subsys_id      = NFNL_SUBSYS_QUEUE,
1358         .cb_count       = NFQNL_MSG_MAX,
1359         .cb             = nfqnl_cb,
1360 };
1361 
1362 #ifdef CONFIG_PROC_FS
1363 struct iter_state {
1364         struct seq_net_private p;
1365         unsigned int bucket;
1366 };
1367 
1368 static struct hlist_node *get_first(struct seq_file *seq)
1369 {
1370         struct iter_state *st = seq->private;
1371         struct net *net;
1372         struct nfnl_queue_net *q;
1373 
1374         if (!st)
1375                 return NULL;
1376 
1377         net = seq_file_net(seq);
1378         q = nfnl_queue_pernet(net);
1379         for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1380                 if (!hlist_empty(&q->instance_table[st->bucket]))
1381                         return q->instance_table[st->bucket].first;
1382         }
1383         return NULL;
1384 }
1385 
1386 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1387 {
1388         struct iter_state *st = seq->private;
1389         struct net *net = seq_file_net(seq);
1390 
1391         h = h->next;
1392         while (!h) {
1393                 struct nfnl_queue_net *q;
1394 
1395                 if (++st->bucket >= INSTANCE_BUCKETS)
1396                         return NULL;
1397 
1398                 q = nfnl_queue_pernet(net);
1399                 h = q->instance_table[st->bucket].first;
1400         }
1401         return h;
1402 }
1403 
1404 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1405 {
1406         struct hlist_node *head;
1407         head = get_first(seq);
1408 
1409         if (head)
1410                 while (pos && (head = get_next(seq, head)))
1411                         pos--;
1412         return pos ? NULL : head;
1413 }
1414 
1415 static void *seq_start(struct seq_file *s, loff_t *pos)
1416         __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1417 {
1418         spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1419         return get_idx(s, *pos);
1420 }
1421 
1422 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1423 {
1424         (*pos)++;
1425         return get_next(s, v);
1426 }
1427 
1428 static void seq_stop(struct seq_file *s, void *v)
1429         __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1430 {
1431         spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1432 }
1433 
1434 static int seq_show(struct seq_file *s, void *v)
1435 {
1436         const struct nfqnl_instance *inst = v;
1437 
1438         seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1439                    inst->queue_num,
1440                    inst->peer_portid, inst->queue_total,
1441                    inst->copy_mode, inst->copy_range,
1442                    inst->queue_dropped, inst->queue_user_dropped,
1443                    inst->id_sequence, 1);
1444         return 0;
1445 }
1446 
1447 static const struct seq_operations nfqnl_seq_ops = {
1448         .start  = seq_start,
1449         .next   = seq_next,
1450         .stop   = seq_stop,
1451         .show   = seq_show,
1452 };
1453 
1454 static int nfqnl_open(struct inode *inode, struct file *file)
1455 {
1456         return seq_open_net(inode, file, &nfqnl_seq_ops,
1457                         sizeof(struct iter_state));
1458 }
1459 
1460 static const struct file_operations nfqnl_file_ops = {
1461         .owner   = THIS_MODULE,
1462         .open    = nfqnl_open,
1463         .read    = seq_read,
1464         .llseek  = seq_lseek,
1465         .release = seq_release_net,
1466 };
1467 
1468 #endif /* PROC_FS */
1469 
1470 static int __net_init nfnl_queue_net_init(struct net *net)
1471 {
1472         unsigned int i;
1473         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1474 
1475         for (i = 0; i < INSTANCE_BUCKETS; i++)
1476                 INIT_HLIST_HEAD(&q->instance_table[i]);
1477 
1478         spin_lock_init(&q->instances_lock);
1479 
1480 #ifdef CONFIG_PROC_FS
1481         if (!proc_create("nfnetlink_queue", 0440,
1482                          net->nf.proc_netfilter, &nfqnl_file_ops))
1483                 return -ENOMEM;
1484 #endif
1485         nf_register_queue_handler(net, &nfqh);
1486         return 0;
1487 }
1488 
1489 static void __net_exit nfnl_queue_net_exit(struct net *net)
1490 {
1491         nf_unregister_queue_handler(net);
1492 #ifdef CONFIG_PROC_FS
1493         remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1494 #endif
1495 }
1496 
1497 static void nfnl_queue_net_exit_batch(struct list_head *net_exit_list)
1498 {
1499         synchronize_rcu();
1500 }
1501 
1502 static struct pernet_operations nfnl_queue_net_ops = {
1503         .init           = nfnl_queue_net_init,
1504         .exit           = nfnl_queue_net_exit,
1505         .exit_batch     = nfnl_queue_net_exit_batch,
1506         .id             = &nfnl_queue_net_id,
1507         .size           = sizeof(struct nfnl_queue_net),
1508 };
1509 
1510 static int __init nfnetlink_queue_init(void)
1511 {
1512         int status;
1513 
1514         status = register_pernet_subsys(&nfnl_queue_net_ops);
1515         if (status < 0) {
1516                 pr_err("nf_queue: failed to register pernet ops\n");
1517                 goto out;
1518         }
1519 
1520         netlink_register_notifier(&nfqnl_rtnl_notifier);
1521         status = nfnetlink_subsys_register(&nfqnl_subsys);
1522         if (status < 0) {
1523                 pr_err("nf_queue: failed to create netlink socket\n");
1524                 goto cleanup_netlink_notifier;
1525         }
1526 
1527         status = register_netdevice_notifier(&nfqnl_dev_notifier);
1528         if (status < 0) {
1529                 pr_err("nf_queue: failed to register netdevice notifier\n");
1530                 goto cleanup_netlink_subsys;
1531         }
1532 
1533         return status;
1534 
1535 cleanup_netlink_subsys:
1536         nfnetlink_subsys_unregister(&nfqnl_subsys);
1537 cleanup_netlink_notifier:
1538         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1539         unregister_pernet_subsys(&nfnl_queue_net_ops);
1540 out:
1541         return status;
1542 }
1543 
1544 static void __exit nfnetlink_queue_fini(void)
1545 {
1546         unregister_netdevice_notifier(&nfqnl_dev_notifier);
1547         nfnetlink_subsys_unregister(&nfqnl_subsys);
1548         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1549         unregister_pernet_subsys(&nfnl_queue_net_ops);
1550 
1551         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1552 }
1553 
1554 MODULE_DESCRIPTION("netfilter packet queue handler");
1555 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1556 MODULE_LICENSE("GPL");
1557 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1558 
1559 module_init(nfnetlink_queue_init);
1560 module_exit(nfnetlink_queue_fini);
1561 

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