Pileus Git - ~andy/linux/blob - net/netfilter/nfnetlink_queue_core.c

   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/nfnetlink.h>
  29 #include <linux/netfilter/nfnetlink_queue.h>
  30 #include <linux/list.h>
  31 #include <net/sock.h>
  32 #include <net/netfilter/nf_queue.h>
  33 #include <net/netns/generic.h>
  34 #include <net/netfilter/nfnetlink_queue.h>
  35
  36 #include <linux/atomic.h>
  37
  38 #ifdef CONFIG_BRIDGE_NETFILTER
  39 #include "../bridge/br_private.h"
  40 #endif
  41
  42 #define NFQNL_QMAX_DEFAULT 1024
  43
  44 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
  45  * includes the header length. Thus, the maximum packet length that we
  46  * support is 65531 bytes. We send truncated packets if the specified length
  47  * is larger than that.  Userspace can check for presence of NFQA_CAP_LEN
  48  * attribute to detect truncation.
  49  */
  50 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
  51
  52 struct nfqnl_instance {
  53         struct hlist_node hlist;                /* global list of queues */
  54         struct rcu_head rcu;
  55
  56         int peer_portid;
  57         unsigned int queue_maxlen;
  58         unsigned int copy_range;
  59         unsigned int queue_dropped;
  60         unsigned int queue_user_dropped;
  61
  62
  63         u_int16_t queue_num;                    /* number of this queue */
  64         u_int8_t copy_mode;
  65         u_int32_t flags;                        /* Set using NFQA_CFG_FLAGS */
  66 /*
  67  * Following fields are dirtied for each queued packet,
  68  * keep them in same cache line if possible.
  69  */
  70         spinlock_t      lock;
  71         unsigned int    queue_total;
  72         unsigned int    id_sequence;            /* 'sequence' of pkt ids */
  73         struct list_head queue_list;            /* packets in queue */
  74 };
  75
  76 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
  77
  78 static int nfnl_queue_net_id __read_mostly;
  79
  80 #define INSTANCE_BUCKETS        16
  81 struct nfnl_queue_net {
  82         spinlock_t instances_lock;
  83         struct hlist_head instance_table[INSTANCE_BUCKETS];
  84 };
  85
  86 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
  87 {
  88         return net_generic(net, nfnl_queue_net_id);
  89 }
  90
  91 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
  92 {
  93         return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
  94 }
  95
  96 static struct nfqnl_instance *
  97 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
  98 {
  99         struct hlist_head *head;
 100         struct nfqnl_instance *inst;
 101
 102         head = &q->instance_table[instance_hashfn(queue_num)];
 103         hlist_for_each_entry_rcu(inst, head, hlist) {
 104                 if (inst->queue_num == queue_num)
 105                         return inst;
 106         }
 107         return NULL;
 108 }
 109
 110 static struct nfqnl_instance *
 111 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
 112                 int portid)
 113 {
 114         struct nfqnl_instance *inst;
 115         unsigned int h;
 116         int err;
 117
 118         spin_lock(&q->instances_lock);
 119         if (instance_lookup(q, queue_num)) {
 120                 err = -EEXIST;
 121                 goto out_unlock;
 122         }
 123
 124         inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
 125         if (!inst) {
 126                 err = -ENOMEM;
 127                 goto out_unlock;
 128         }
 129
 130         inst->queue_num = queue_num;
 131         inst->peer_portid = portid;
 132         inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
 133         inst->copy_range = NFQNL_MAX_COPY_RANGE;
 134         inst->copy_mode = NFQNL_COPY_NONE;
 135         spin_lock_init(&inst->lock);
 136         INIT_LIST_HEAD(&inst->queue_list);
 137
 138         if (!try_module_get(THIS_MODULE)) {
 139                 err = -EAGAIN;
 140                 goto out_free;
 141         }
 142
 143         h = instance_hashfn(queue_num);
 144         hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
 145
 146         spin_unlock(&q->instances_lock);
 147
 148         return inst;
 149
 150 out_free:
 151         kfree(inst);
 152 out_unlock:
 153         spin_unlock(&q->instances_lock);
 154         return ERR_PTR(err);
 155 }
 156
 157 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
 158                         unsigned long data);
 159
 160 static void
 161 instance_destroy_rcu(struct rcu_head *head)
 162 {
 163         struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
 164                                                    rcu);
 165
 166         nfqnl_flush(inst, NULL, 0);
 167         kfree(inst);
 168         module_put(THIS_MODULE);
 169 }
 170
 171 static void
 172 __instance_destroy(struct nfqnl_instance *inst)
 173 {
 174         hlist_del_rcu(&inst->hlist);
 175         call_rcu(&inst->rcu, instance_destroy_rcu);
 176 }
 177
 178 static void
 179 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
 180 {
 181         spin_lock(&q->instances_lock);
 182         __instance_destroy(inst);
 183         spin_unlock(&q->instances_lock);
 184 }
 185
 186 static inline void
 187 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 188 {
 189        list_add_tail(&entry->list, &queue->queue_list);
 190        queue->queue_total++;
 191 }
 192
 193 static void
 194 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 195 {
 196         list_del(&entry->list);
 197         queue->queue_total--;
 198 }
 199
 200 static struct nf_queue_entry *
 201 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
 202 {
 203         struct nf_queue_entry *entry = NULL, *i;
 204
 205         spin_lock_bh(&queue->lock);
 206
 207         list_for_each_entry(i, &queue->queue_list, list) {
 208                 if (i->id == id) {
 209                         entry = i;
 210                         break;
 211                 }
 212         }
 213
 214         if (entry)
 215                 __dequeue_entry(queue, entry);
 216
 217         spin_unlock_bh(&queue->lock);
 218
 219         return entry;
 220 }
 221
 222 static void
 223 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
 224 {
 225         struct nf_queue_entry *entry, *next;
 226
 227         spin_lock_bh(&queue->lock);
 228         list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
 229                 if (!cmpfn || cmpfn(entry, data)) {
 230                         list_del(&entry->list);
 231                         queue->queue_total--;
 232                         nf_reinject(entry, NF_DROP);
 233                 }
 234         }
 235         spin_unlock_bh(&queue->lock);
 236 }
 237
 238 static int
 239 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
 240                       bool csum_verify)
 241 {
 242         __u32 flags = 0;
 243
 244         if (packet->ip_summed == CHECKSUM_PARTIAL)
 245                 flags = NFQA_SKB_CSUMNOTREADY;
 246         else if (csum_verify)
 247                 flags = NFQA_SKB_CSUM_NOTVERIFIED;
 248
 249         if (skb_is_gso(packet))
 250                 flags |= NFQA_SKB_GSO;
 251
 252         return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
 253 }
 254
 255 static struct sk_buff *
 256 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 257                            struct nf_queue_entry *entry,
 258                            __be32 **packet_id_ptr)
 259 {
 260         size_t size;
 261         size_t data_len = 0, cap_len = 0;
 262         unsigned int hlen = 0;
 263         struct sk_buff *skb;
 264         struct nlattr *nla;
 265         struct nfqnl_msg_packet_hdr *pmsg;
 266         struct nlmsghdr *nlh;
 267         struct nfgenmsg *nfmsg;
 268         struct sk_buff *entskb = entry->skb;
 269         struct net_device *indev;
 270         struct net_device *outdev;
 271         struct nf_conn *ct = NULL;
 272         enum ip_conntrack_info uninitialized_var(ctinfo);
 273         bool csum_verify;
 274
 275         size =    nlmsg_total_size(sizeof(struct nfgenmsg))
 276                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
 277                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 278                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 279 #ifdef CONFIG_BRIDGE_NETFILTER
 280                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 281                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 282 #endif
 283                 + nla_total_size(sizeof(u_int32_t))     /* mark */
 284                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
 285                 + nla_total_size(sizeof(u_int32_t))     /* skbinfo */
 286                 + nla_total_size(sizeof(u_int32_t));    /* cap_len */
 287
 288         if (entskb->tstamp.tv64)
 289                 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
 290
 291         if (entry->hook <= NF_INET_FORWARD ||
 292            (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
 293                 csum_verify = !skb_csum_unnecessary(entskb);
 294         else
 295                 csum_verify = false;
 296
 297         outdev = entry->outdev;
 298
 299         switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
 300         case NFQNL_COPY_META:
 301         case NFQNL_COPY_NONE:
 302                 break;
 303
 304         case NFQNL_COPY_PACKET:
 305                 if (!(queue->flags & NFQA_CFG_F_GSO) &&
 306                     entskb->ip_summed == CHECKSUM_PARTIAL &&
 307                     skb_checksum_help(entskb))
 308                         return NULL;
 309
 310                 data_len = ACCESS_ONCE(queue->copy_range);
 311                 if (data_len > entskb->len)
 312                         data_len = entskb->len;
 313
 314                 hlen = skb_zerocopy_headlen(entskb);
 315                 hlen = min_t(unsigned int, hlen, data_len);
 316                 size += sizeof(struct nlattr) + hlen;
 317                 cap_len = entskb->len;
 318                 break;
 319         }
 320
 321         if (queue->flags & NFQA_CFG_F_CONNTRACK)
 322                 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
 323
 324         skb = nfnetlink_alloc_skb(net, size, queue->peer_portid,
 325                                   GFP_ATOMIC);
 326         if (!skb)
 327                 return NULL;
 328
 329         nlh = nlmsg_put(skb, 0, 0,
 330                         NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
 331                         sizeof(struct nfgenmsg), 0);
 332         if (!nlh) {
 333                 kfree_skb(skb);
 334                 return NULL;
 335         }
 336         nfmsg = nlmsg_data(nlh);
 337         nfmsg->nfgen_family = entry->pf;
 338         nfmsg->version = NFNETLINK_V0;
 339         nfmsg->res_id = htons(queue->queue_num);
 340
 341         nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
 342         pmsg = nla_data(nla);
 343         pmsg->hw_protocol       = entskb->protocol;
 344         pmsg->hook              = entry->hook;
 345         *packet_id_ptr          = &pmsg->packet_id;
 346
 347         indev = entry->indev;
 348         if (indev) {
 349 #ifndef CONFIG_BRIDGE_NETFILTER
 350                 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
 351                         goto nla_put_failure;
 352 #else
 353                 if (entry->pf == PF_BRIDGE) {
 354                         /* Case 1: indev is physical input device, we need to
 355                          * look for bridge group (when called from
 356                          * netfilter_bridge) */
 357                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 358                                          htonl(indev->ifindex)) ||
 359                         /* this is the bridge group "brX" */
 360                         /* rcu_read_lock()ed by __nf_queue */
 361                             nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 362                                          htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
 363                                 goto nla_put_failure;
 364                 } else {
 365                         /* Case 2: indev is bridge group, we need to look for
 366                          * physical device (when called from ipv4) */
 367                         if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 368                                          htonl(indev->ifindex)))
 369                                 goto nla_put_failure;
 370                         if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
 371                             nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 372                                          htonl(entskb->nf_bridge->physindev->ifindex)))
 373                                 goto nla_put_failure;
 374                 }
 375 #endif
 376         }
 377
 378         if (outdev) {
 379 #ifndef CONFIG_BRIDGE_NETFILTER
 380                 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
 381                         goto nla_put_failure;
 382 #else
 383                 if (entry->pf == PF_BRIDGE) {
 384                         /* Case 1: outdev is physical output device, we need to
 385                          * look for bridge group (when called from
 386                          * netfilter_bridge) */
 387                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 388                                          htonl(outdev->ifindex)) ||
 389                         /* this is the bridge group "brX" */
 390                         /* rcu_read_lock()ed by __nf_queue */
 391                             nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 392                                          htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
 393                                 goto nla_put_failure;
 394                 } else {
 395                         /* Case 2: outdev is bridge group, we need to look for
 396                          * physical output device (when called from ipv4) */
 397                         if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 398                                          htonl(outdev->ifindex)))
 399                                 goto nla_put_failure;
 400                         if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
 401                             nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 402                                          htonl(entskb->nf_bridge->physoutdev->ifindex)))
 403                                 goto nla_put_failure;
 404                 }
 405 #endif
 406         }
 407
 408         if (entskb->mark &&
 409             nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
 410                 goto nla_put_failure;
 411
 412         if (indev && entskb->dev &&
 413             entskb->mac_header != entskb->network_header) {
 414                 struct nfqnl_msg_packet_hw phw;
 415                 int len;
 416
 417                 memset(&phw, 0, sizeof(phw));
 418                 len = dev_parse_header(entskb, phw.hw_addr);
 419                 if (len) {
 420                         phw.hw_addrlen = htons(len);
 421                         if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
 422                                 goto nla_put_failure;
 423                 }
 424         }
 425
 426         if (entskb->tstamp.tv64) {
 427                 struct nfqnl_msg_packet_timestamp ts;
 428                 struct timeval tv = ktime_to_timeval(entskb->tstamp);
 429                 ts.sec = cpu_to_be64(tv.tv_sec);
 430                 ts.usec = cpu_to_be64(tv.tv_usec);
 431
 432                 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
 433                         goto nla_put_failure;
 434         }
 435
 436         if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
 437                 goto nla_put_failure;
 438
 439         if (cap_len > data_len &&
 440             nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
 441                 goto nla_put_failure;
 442
 443         if (nfqnl_put_packet_info(skb, entskb, csum_verify))
 444                 goto nla_put_failure;
 445
 446         if (data_len) {
 447                 struct nlattr *nla;
 448
 449                 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
 450                         goto nla_put_failure;
 451
 452                 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
 453                 nla->nla_type = NFQA_PAYLOAD;
 454                 nla->nla_len = nla_attr_size(data_len);
 455
 456                 skb_zerocopy(skb, entskb, data_len, hlen);
 457         }
 458
 459         nlh->nlmsg_len = skb->len;
 460         return skb;
 461
 462 nla_put_failure:
 463         kfree_skb(skb);
 464         net_err_ratelimited("nf_queue: error creating packet message\n");
 465         return NULL;
 466 }
 467
 468 static int
 469 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
 470                         struct nf_queue_entry *entry)
 471 {
 472         struct sk_buff *nskb;
 473         int err = -ENOBUFS;
 474         __be32 *packet_id_ptr;
 475         int failopen = 0;
 476
 477         nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
 478         if (nskb == NULL) {
 479                 err = -ENOMEM;
 480                 goto err_out;
 481         }
 482         spin_lock_bh(&queue->lock);
 483
 484         if (queue->queue_total >= queue->queue_maxlen) {
 485                 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
 486                         failopen = 1;
 487                         err = 0;
 488                 } else {
 489                         queue->queue_dropped++;
 490                         net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
 491                                              queue->queue_total);
 492                 }
 493                 goto err_out_free_nskb;
 494         }
 495         entry->id = ++queue->id_sequence;
 496         *packet_id_ptr = htonl(entry->id);
 497
 498         /* nfnetlink_unicast will either free the nskb or add it to a socket */
 499         err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
 500         if (err < 0) {
 501                 queue->queue_user_dropped++;
 502                 goto err_out_unlock;
 503         }
 504
 505         __enqueue_entry(queue, entry);
 506
 507         spin_unlock_bh(&queue->lock);
 508         return 0;
 509
 510 err_out_free_nskb:
 511         kfree_skb(nskb);
 512 err_out_unlock:
 513         spin_unlock_bh(&queue->lock);
 514         if (failopen)
 515                 nf_reinject(entry, NF_ACCEPT);
 516 err_out:
 517         return err;
 518 }
 519
 520 static struct nf_queue_entry *
 521 nf_queue_entry_dup(struct nf_queue_entry *e)
 522 {
 523         struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
 524         if (entry) {
 525                 if (nf_queue_entry_get_refs(entry))
 526                         return entry;
 527                 kfree(entry);
 528         }
 529         return NULL;
 530 }
 531
 532 #ifdef CONFIG_BRIDGE_NETFILTER
 533 /* When called from bridge netfilter, skb->data must point to MAC header
 534  * before calling skb_gso_segment(). Else, original MAC header is lost
 535  * and segmented skbs will be sent to wrong destination.
 536  */
 537 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
 538 {
 539         if (skb->nf_bridge)
 540                 __skb_push(skb, skb->network_header - skb->mac_header);
 541 }
 542
 543 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
 544 {
 545         if (skb->nf_bridge)
 546                 __skb_pull(skb, skb->network_header - skb->mac_header);
 547 }
 548 #else
 549 #define nf_bridge_adjust_skb_data(s) do {} while (0)
 550 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
 551 #endif
 552
 553 static void free_entry(struct nf_queue_entry *entry)
 554 {
 555         nf_queue_entry_release_refs(entry);
 556         kfree(entry);
 557 }
 558
 559 static int
 560 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
 561                            struct sk_buff *skb, struct nf_queue_entry *entry)
 562 {
 563         int ret = -ENOMEM;
 564         struct nf_queue_entry *entry_seg;
 565
 566         nf_bridge_adjust_segmented_data(skb);
 567
 568         if (skb->next == NULL) { /* last packet, no need to copy entry */
 569                 struct sk_buff *gso_skb = entry->skb;
 570                 entry->skb = skb;
 571                 ret = __nfqnl_enqueue_packet(net, queue, entry);
 572                 if (ret)
 573                         entry->skb = gso_skb;
 574                 return ret;
 575         }
 576
 577         skb->next = NULL;
 578
 579         entry_seg = nf_queue_entry_dup(entry);
 580         if (entry_seg) {
 581                 entry_seg->skb = skb;
 582                 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
 583                 if (ret)
 584                         free_entry(entry_seg);
 585         }
 586         return ret;
 587 }
 588
 589 static int
 590 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 591 {
 592         unsigned int queued;
 593         struct nfqnl_instance *queue;
 594         struct sk_buff *skb, *segs;
 595         int err = -ENOBUFS;
 596         struct net *net = dev_net(entry->indev ?
 597                                   entry->indev : entry->outdev);
 598         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 599
 600         /* rcu_read_lock()ed by nf_hook_slow() */
 601         queue = instance_lookup(q, queuenum);
 602         if (!queue)
 603                 return -ESRCH;
 604
 605         if (queue->copy_mode == NFQNL_COPY_NONE)
 606                 return -EINVAL;
 607
 608         skb = entry->skb;
 609
 610         switch (entry->pf) {
 611         case NFPROTO_IPV4:
 612                 skb->protocol = htons(ETH_P_IP);
 613                 break;
 614         case NFPROTO_IPV6:
 615                 skb->protocol = htons(ETH_P_IPV6);
 616                 break;
 617         }
 618
 619         if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
 620                 return __nfqnl_enqueue_packet(net, queue, entry);
 621
 622         nf_bridge_adjust_skb_data(skb);
 623         segs = skb_gso_segment(skb, 0);
 624         /* Does not use PTR_ERR to limit the number of error codes that can be
 625          * returned by nf_queue.  For instance, callers rely on -ECANCELED to
 626          * mean 'ignore this hook'.
 627          */
 628         if (IS_ERR(segs))
 629                 goto out_err;
 630         queued = 0;
 631         err = 0;
 632         do {
 633                 struct sk_buff *nskb = segs->next;
 634                 if (err == 0)
 635                         err = __nfqnl_enqueue_packet_gso(net, queue,
 636                                                         segs, entry);
 637                 if (err == 0)
 638                         queued++;
 639                 else
 640                         kfree_skb(segs);
 641                 segs = nskb;
 642         } while (segs);
 643
 644         if (queued) {
 645                 if (err) /* some segments are already queued */
 646                         free_entry(entry);
 647                 kfree_skb(skb);
 648                 return 0;
 649         }
 650  out_err:
 651         nf_bridge_adjust_segmented_data(skb);
 652         return err;
 653 }
 654
 655 static int
 656 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
 657 {
 658         struct sk_buff *nskb;
 659
 660         if (diff < 0) {
 661                 if (pskb_trim(e->skb, data_len))
 662                         return -ENOMEM;
 663         } else if (diff > 0) {
 664                 if (data_len > 0xFFFF)
 665                         return -EINVAL;
 666                 if (diff > skb_tailroom(e->skb)) {
 667                         nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
 668                                                diff, GFP_ATOMIC);
 669                         if (!nskb) {
 670                                 printk(KERN_WARNING "nf_queue: OOM "
 671                                       "in mangle, dropping packet\n");
 672                                 return -ENOMEM;
 673                         }
 674                         kfree_skb(e->skb);
 675                         e->skb = nskb;
 676                 }
 677                 skb_put(e->skb, diff);
 678         }
 679         if (!skb_make_writable(e->skb, data_len))
 680                 return -ENOMEM;
 681         skb_copy_to_linear_data(e->skb, data, data_len);
 682         e->skb->ip_summed = CHECKSUM_NONE;
 683         return 0;
 684 }
 685
 686 static int
 687 nfqnl_set_mode(struct nfqnl_instance *queue,
 688                unsigned char mode, unsigned int range)
 689 {
 690         int status = 0;
 691
 692         spin_lock_bh(&queue->lock);
 693         switch (mode) {
 694         case NFQNL_COPY_NONE:
 695         case NFQNL_COPY_META:
 696                 queue->copy_mode = mode;
 697                 queue->copy_range = 0;
 698                 break;
 699
 700         case NFQNL_COPY_PACKET:
 701                 queue->copy_mode = mode;
 702                 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
 703                         queue->copy_range = NFQNL_MAX_COPY_RANGE;
 704                 else
 705                         queue->copy_range = range;
 706                 break;
 707
 708         default:
 709                 status = -EINVAL;
 710
 711         }
 712         spin_unlock_bh(&queue->lock);
 713
 714         return status;
 715 }
 716
 717 static int
 718 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
 719 {
 720         if (entry->indev)
 721                 if (entry->indev->ifindex == ifindex)
 722                         return 1;
 723         if (entry->outdev)
 724                 if (entry->outdev->ifindex == ifindex)
 725                         return 1;
 726 #ifdef CONFIG_BRIDGE_NETFILTER
 727         if (entry->skb->nf_bridge) {
 728                 if (entry->skb->nf_bridge->physindev &&
 729                     entry->skb->nf_bridge->physindev->ifindex == ifindex)
 730                         return 1;
 731                 if (entry->skb->nf_bridge->physoutdev &&
 732                     entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
 733                         return 1;
 734         }
 735 #endif
 736         return 0;
 737 }
 738
 739 /* drop all packets with either indev or outdev == ifindex from all queue
 740  * instances */
 741 static void
 742 nfqnl_dev_drop(struct net *net, int ifindex)
 743 {
 744         int i;
 745         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 746
 747         rcu_read_lock();
 748
 749         for (i = 0; i < INSTANCE_BUCKETS; i++) {
 750                 struct nfqnl_instance *inst;
 751                 struct hlist_head *head = &q->instance_table[i];
 752
 753                 hlist_for_each_entry_rcu(inst, head, hlist)
 754                         nfqnl_flush(inst, dev_cmp, ifindex);
 755         }
 756
 757         rcu_read_unlock();
 758 }
 759
 760 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
 761
 762 static int
 763 nfqnl_rcv_dev_event(struct notifier_block *this,
 764                     unsigned long event, void *ptr)
 765 {
 766         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 767
 768         /* Drop any packets associated with the downed device */
 769         if (event == NETDEV_DOWN)
 770                 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
 771         return NOTIFY_DONE;
 772 }
 773
 774 static struct notifier_block nfqnl_dev_notifier = {
 775         .notifier_call  = nfqnl_rcv_dev_event,
 776 };
 777
 778 static int
 779 nfqnl_rcv_nl_event(struct notifier_block *this,
 780                    unsigned long event, void *ptr)
 781 {
 782         struct netlink_notify *n = ptr;
 783         struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
 784
 785         if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
 786                 int i;
 787
 788                 /* destroy all instances for this portid */
 789                 spin_lock(&q->instances_lock);
 790                 for (i = 0; i < INSTANCE_BUCKETS; i++) {
 791                         struct hlist_node *t2;
 792                         struct nfqnl_instance *inst;
 793                         struct hlist_head *head = &q->instance_table[i];
 794
 795                         hlist_for_each_entry_safe(inst, t2, head, hlist) {
 796                                 if (n->portid == inst->peer_portid)
 797                                         __instance_destroy(inst);
 798                         }
 799                 }
 800                 spin_unlock(&q->instances_lock);
 801         }
 802         return NOTIFY_DONE;
 803 }
 804
 805 static struct notifier_block nfqnl_rtnl_notifier = {
 806         .notifier_call  = nfqnl_rcv_nl_event,
 807 };
 808
 809 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
 810         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 811         [NFQA_MARK]             = { .type = NLA_U32 },
 812         [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
 813         [NFQA_CT]               = { .type = NLA_UNSPEC },
 814         [NFQA_EXP]              = { .type = NLA_UNSPEC },
 815 };
 816
 817 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
 818         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 819         [NFQA_MARK]             = { .type = NLA_U32 },
 820 };
 821
 822 static struct nfqnl_instance *
 823 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
 824 {
 825         struct nfqnl_instance *queue;
 826
 827         queue = instance_lookup(q, queue_num);
 828         if (!queue)
 829                 return ERR_PTR(-ENODEV);
 830
 831         if (queue->peer_portid != nlportid)
 832                 return ERR_PTR(-EPERM);
 833
 834         return queue;
 835 }
 836
 837 static struct nfqnl_msg_verdict_hdr*
 838 verdicthdr_get(const struct nlattr * const nfqa[])
 839 {
 840         struct nfqnl_msg_verdict_hdr *vhdr;
 841         unsigned int verdict;
 842
 843         if (!nfqa[NFQA_VERDICT_HDR])
 844                 return NULL;
 845
 846         vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
 847         verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
 848         if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
 849                 return NULL;
 850         return vhdr;
 851 }
 852
 853 static int nfq_id_after(unsigned int id, unsigned int max)
 854 {
 855         return (int)(id - max) > 0;
 856 }
 857
 858 static int
 859 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
 860                    const struct nlmsghdr *nlh,
 861                    const struct nlattr * const nfqa[])
 862 {
 863         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 864         struct nf_queue_entry *entry, *tmp;
 865         unsigned int verdict, maxid;
 866         struct nfqnl_msg_verdict_hdr *vhdr;
 867         struct nfqnl_instance *queue;
 868         LIST_HEAD(batch_list);
 869         u16 queue_num = ntohs(nfmsg->res_id);
 870
 871         struct net *net = sock_net(ctnl);
 872         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 873
 874         queue = verdict_instance_lookup(q, queue_num,
 875                                         NETLINK_CB(skb).portid);
 876         if (IS_ERR(queue))
 877                 return PTR_ERR(queue);
 878
 879         vhdr = verdicthdr_get(nfqa);
 880         if (!vhdr)
 881                 return -EINVAL;
 882
 883         verdict = ntohl(vhdr->verdict);
 884         maxid = ntohl(vhdr->id);
 885
 886         spin_lock_bh(&queue->lock);
 887
 888         list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
 889                 if (nfq_id_after(entry->id, maxid))
 890                         break;
 891                 __dequeue_entry(queue, entry);
 892                 list_add_tail(&entry->list, &batch_list);
 893         }
 894
 895         spin_unlock_bh(&queue->lock);
 896
 897         if (list_empty(&batch_list))
 898                 return -ENOENT;
 899
 900         list_for_each_entry_safe(entry, tmp, &batch_list, list) {
 901                 if (nfqa[NFQA_MARK])
 902                         entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 903                 nf_reinject(entry, verdict);
 904         }
 905         return 0;
 906 }
 907
 908 static int
 909 nfqnl_recv_verdict(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         u_int16_t queue_num = ntohs(nfmsg->res_id);
 915
 916         struct nfqnl_msg_verdict_hdr *vhdr;
 917         struct nfqnl_instance *queue;
 918         unsigned int verdict;
 919         struct nf_queue_entry *entry;
 920         enum ip_conntrack_info uninitialized_var(ctinfo);
 921         struct nf_conn *ct = NULL;
 922
 923         struct net *net = sock_net(ctnl);
 924         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 925
 926         queue = instance_lookup(q, queue_num);
 927         if (!queue)
 928                 queue = verdict_instance_lookup(q, queue_num,
 929                                                 NETLINK_CB(skb).portid);
 930         if (IS_ERR(queue))
 931                 return PTR_ERR(queue);
 932
 933         vhdr = verdicthdr_get(nfqa);
 934         if (!vhdr)
 935                 return -EINVAL;
 936
 937         verdict = ntohl(vhdr->verdict);
 938
 939         entry = find_dequeue_entry(queue, ntohl(vhdr->id));
 940         if (entry == NULL)
 941                 return -ENOENT;
 942
 943         if (nfqa[NFQA_CT]) {
 944                 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
 945                 if (ct && nfqa[NFQA_EXP]) {
 946                         nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
 947                                             NETLINK_CB(skb).portid,
 948                                             nlmsg_report(nlh));
 949                 }
 950         }
 951
 952         if (nfqa[NFQA_PAYLOAD]) {
 953                 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
 954                 int diff = payload_len - entry->skb->len;
 955
 956                 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
 957                                  payload_len, entry, diff) < 0)
 958                         verdict = NF_DROP;
 959
 960                 if (ct)
 961                         nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
 962         }
 963
 964         if (nfqa[NFQA_MARK])
 965                 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 966
 967         nf_reinject(entry, verdict);
 968         return 0;
 969 }
 970
 971 static int
 972 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
 973                   const struct nlmsghdr *nlh,
 974                   const struct nlattr * const nfqa[])
 975 {
 976         return -ENOTSUPP;
 977 }
 978
 979 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
 980         [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
 981         [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
 982 };
 983
 984 static const struct nf_queue_handler nfqh = {
 985         .outfn  = &nfqnl_enqueue_packet,
 986 };
 987
 988 static int
 989 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
 990                   const struct nlmsghdr *nlh,
 991                   const struct nlattr * const nfqa[])
 992 {
 993         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 994         u_int16_t queue_num = ntohs(nfmsg->res_id);
 995         struct nfqnl_instance *queue;
 996         struct nfqnl_msg_config_cmd *cmd = NULL;
 997         struct net *net = sock_net(ctnl);
 998         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 999         int ret = 0;
1000
1001         if (nfqa[NFQA_CFG_CMD]) {
1002                 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1003
1004                 /* Obsolete commands without queue context */
1005                 switch (cmd->command) {
1006                 case NFQNL_CFG_CMD_PF_BIND: return 0;
1007                 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1008                 }
1009         }
1010
1011         rcu_read_lock();
1012         queue = instance_lookup(q, queue_num);
1013         if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1014                 ret = -EPERM;
1015                 goto err_out_unlock;
1016         }
1017
1018         if (cmd != NULL) {
1019                 switch (cmd->command) {
1020                 case NFQNL_CFG_CMD_BIND:
1021                         if (queue) {
1022                                 ret = -EBUSY;
1023                                 goto err_out_unlock;
1024                         }
1025                         queue = instance_create(q, queue_num,
1026                                                 NETLINK_CB(skb).portid);
1027                         if (IS_ERR(queue)) {
1028                                 ret = PTR_ERR(queue);
1029                                 goto err_out_unlock;
1030                         }
1031                         break;
1032                 case NFQNL_CFG_CMD_UNBIND:
1033                         if (!queue) {
1034                                 ret = -ENODEV;
1035                                 goto err_out_unlock;
1036                         }
1037                         instance_destroy(q, queue);
1038                         break;
1039                 case NFQNL_CFG_CMD_PF_BIND:
1040                 case NFQNL_CFG_CMD_PF_UNBIND:
1041                         break;
1042                 default:
1043                         ret = -ENOTSUPP;
1044                         break;
1045                 }
1046         }
1047
1048         if (nfqa[NFQA_CFG_PARAMS]) {
1049                 struct nfqnl_msg_config_params *params;
1050
1051                 if (!queue) {
1052                         ret = -ENODEV;
1053                         goto err_out_unlock;
1054                 }
1055                 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1056                 nfqnl_set_mode(queue, params->copy_mode,
1057                                 ntohl(params->copy_range));
1058         }
1059
1060         if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1061                 __be32 *queue_maxlen;
1062
1063                 if (!queue) {
1064                         ret = -ENODEV;
1065                         goto err_out_unlock;
1066                 }
1067                 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1068                 spin_lock_bh(&queue->lock);
1069                 queue->queue_maxlen = ntohl(*queue_maxlen);
1070                 spin_unlock_bh(&queue->lock);
1071         }
1072
1073         if (nfqa[NFQA_CFG_FLAGS]) {
1074                 __u32 flags, mask;
1075
1076                 if (!queue) {
1077                         ret = -ENODEV;
1078                         goto err_out_unlock;
1079                 }
1080
1081                 if (!nfqa[NFQA_CFG_MASK]) {
1082                         /* A mask is needed to specify which flags are being
1083                          * changed.
1084                          */
1085                         ret = -EINVAL;
1086                         goto err_out_unlock;
1087                 }
1088
1089                 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1090                 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1091
1092                 if (flags >= NFQA_CFG_F_MAX) {
1093                         ret = -EOPNOTSUPP;
1094                         goto err_out_unlock;
1095                 }
1096
1097                 spin_lock_bh(&queue->lock);
1098                 queue->flags &= ~mask;
1099                 queue->flags |= flags & mask;
1100                 spin_unlock_bh(&queue->lock);
1101         }
1102
1103 err_out_unlock:
1104         rcu_read_unlock();
1105         return ret;
1106 }
1107
1108 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1109         [NFQNL_MSG_PACKET]      = { .call_rcu = nfqnl_recv_unsupp,
1110                                     .attr_count = NFQA_MAX, },
1111         [NFQNL_MSG_VERDICT]     = { .call_rcu = nfqnl_recv_verdict,
1112                                     .attr_count = NFQA_MAX,
1113                                     .policy = nfqa_verdict_policy },
1114         [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
1115                                     .attr_count = NFQA_CFG_MAX,
1116                                     .policy = nfqa_cfg_policy },
1117         [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1118                                     .attr_count = NFQA_MAX,
1119                                     .policy = nfqa_verdict_batch_policy },
1120 };
1121
1122 static const struct nfnetlink_subsystem nfqnl_subsys = {
1123         .name           = "nf_queue",
1124         .subsys_id      = NFNL_SUBSYS_QUEUE,
1125         .cb_count       = NFQNL_MSG_MAX,
1126         .cb             = nfqnl_cb,
1127 };
1128
1129 #ifdef CONFIG_PROC_FS
1130 struct iter_state {
1131         struct seq_net_private p;
1132         unsigned int bucket;
1133 };
1134
1135 static struct hlist_node *get_first(struct seq_file *seq)
1136 {
1137         struct iter_state *st = seq->private;
1138         struct net *net;
1139         struct nfnl_queue_net *q;
1140
1141         if (!st)
1142                 return NULL;
1143
1144         net = seq_file_net(seq);
1145         q = nfnl_queue_pernet(net);
1146         for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1147                 if (!hlist_empty(&q->instance_table[st->bucket]))
1148                         return q->instance_table[st->bucket].first;
1149         }
1150         return NULL;
1151 }
1152
1153 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1154 {
1155         struct iter_state *st = seq->private;
1156         struct net *net = seq_file_net(seq);
1157
1158         h = h->next;
1159         while (!h) {
1160                 struct nfnl_queue_net *q;
1161
1162                 if (++st->bucket >= INSTANCE_BUCKETS)
1163                         return NULL;
1164
1165                 q = nfnl_queue_pernet(net);
1166                 h = q->instance_table[st->bucket].first;
1167         }
1168         return h;
1169 }
1170
1171 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1172 {
1173         struct hlist_node *head;
1174         head = get_first(seq);
1175
1176         if (head)
1177                 while (pos && (head = get_next(seq, head)))
1178                         pos--;
1179         return pos ? NULL : head;
1180 }
1181
1182 static void *seq_start(struct seq_file *s, loff_t *pos)
1183         __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1184 {
1185         spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1186         return get_idx(s, *pos);
1187 }
1188
1189 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1190 {
1191         (*pos)++;
1192         return get_next(s, v);
1193 }
1194
1195 static void seq_stop(struct seq_file *s, void *v)
1196         __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1197 {
1198         spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1199 }
1200
1201 static int seq_show(struct seq_file *s, void *v)
1202 {
1203         const struct nfqnl_instance *inst = v;
1204
1205         return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1206                           inst->queue_num,
1207                           inst->peer_portid, inst->queue_total,
1208                           inst->copy_mode, inst->copy_range,
1209                           inst->queue_dropped, inst->queue_user_dropped,
1210                           inst->id_sequence, 1);
1211 }
1212
1213 static const struct seq_operations nfqnl_seq_ops = {
1214         .start  = seq_start,
1215         .next   = seq_next,
1216         .stop   = seq_stop,
1217         .show   = seq_show,
1218 };
1219
1220 static int nfqnl_open(struct inode *inode, struct file *file)
1221 {
1222         return seq_open_net(inode, file, &nfqnl_seq_ops,
1223                         sizeof(struct iter_state));
1224 }
1225
1226 static const struct file_operations nfqnl_file_ops = {
1227         .owner   = THIS_MODULE,
1228         .open    = nfqnl_open,
1229         .read    = seq_read,
1230         .llseek  = seq_lseek,
1231         .release = seq_release_net,
1232 };
1233
1234 #endif /* PROC_FS */
1235
1236 static int __net_init nfnl_queue_net_init(struct net *net)
1237 {
1238         unsigned int i;
1239         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1240
1241         for (i = 0; i < INSTANCE_BUCKETS; i++)
1242                 INIT_HLIST_HEAD(&q->instance_table[i]);
1243
1244         spin_lock_init(&q->instances_lock);
1245
1246 #ifdef CONFIG_PROC_FS
1247         if (!proc_create("nfnetlink_queue", 0440,
1248                          net->nf.proc_netfilter, &nfqnl_file_ops))
1249                 return -ENOMEM;
1250 #endif
1251         return 0;
1252 }
1253
1254 static void __net_exit nfnl_queue_net_exit(struct net *net)
1255 {
1256 #ifdef CONFIG_PROC_FS
1257         remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1258 #endif
1259 }
1260
1261 static struct pernet_operations nfnl_queue_net_ops = {
1262         .init   = nfnl_queue_net_init,
1263         .exit   = nfnl_queue_net_exit,
1264         .id     = &nfnl_queue_net_id,
1265         .size   = sizeof(struct nfnl_queue_net),
1266 };
1267
1268 static int __init nfnetlink_queue_init(void)
1269 {
1270         int status = -ENOMEM;
1271
1272         netlink_register_notifier(&nfqnl_rtnl_notifier);
1273         status = nfnetlink_subsys_register(&nfqnl_subsys);
1274         if (status < 0) {
1275                 pr_err("nf_queue: failed to create netlink socket\n");
1276                 goto cleanup_netlink_notifier;
1277         }
1278
1279         status = register_pernet_subsys(&nfnl_queue_net_ops);
1280         if (status < 0) {
1281                 pr_err("nf_queue: failed to register pernet ops\n");
1282                 goto cleanup_subsys;
1283         }
1284         register_netdevice_notifier(&nfqnl_dev_notifier);
1285         nf_register_queue_handler(&nfqh);
1286         return status;
1287
1288 cleanup_subsys:
1289         nfnetlink_subsys_unregister(&nfqnl_subsys);
1290 cleanup_netlink_notifier:
1291         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1292         return status;
1293 }
1294
1295 static void __exit nfnetlink_queue_fini(void)
1296 {
1297         nf_unregister_queue_handler();
1298         unregister_netdevice_notifier(&nfqnl_dev_notifier);
1299         unregister_pernet_subsys(&nfnl_queue_net_ops);
1300         nfnetlink_subsys_unregister(&nfqnl_subsys);
1301         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1302
1303         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1304 }
1305
1306 MODULE_DESCRIPTION("netfilter packet queue handler");
1307 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1308 MODULE_LICENSE("GPL");
1309 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1310
1311 module_init(nfnetlink_queue_init);
1312 module_exit(nfnetlink_queue_fini);