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/tcp_states.h>
  33 #include <net/netfilter/nf_queue.h>
  34 #include <net/netns/generic.h>
  35 #include <net/netfilter/nfnetlink_queue.h>
  36
  37 #include <linux/atomic.h>
  38
  39 #ifdef CONFIG_BRIDGE_NETFILTER
  40 #include "../bridge/br_private.h"
  41 #endif
  42
  43 #define NFQNL_QMAX_DEFAULT 1024
  44
  45 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
  46  * includes the header length. Thus, the maximum packet length that we
  47  * support is 65531 bytes. We send truncated packets if the specified length
  48  * is larger than that.  Userspace can check for presence of NFQA_CAP_LEN
  49  * attribute to detect truncation.
  50  */
  51 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
  52
  53 struct nfqnl_instance {
  54         struct hlist_node hlist;                /* global list of queues */
  55         struct rcu_head rcu;
  56
  57         int peer_portid;
  58         unsigned int queue_maxlen;
  59         unsigned int copy_range;
  60         unsigned int queue_dropped;
  61         unsigned int queue_user_dropped;
  62
  63
  64         u_int16_t queue_num;                    /* number of this queue */
  65         u_int8_t copy_mode;
  66         u_int32_t flags;                        /* Set using NFQA_CFG_FLAGS */
  67 /*
  68  * Following fields are dirtied for each queued packet,
  69  * keep them in same cache line if possible.
  70  */
  71         spinlock_t      lock;
  72         unsigned int    queue_total;
  73         unsigned int    id_sequence;            /* 'sequence' of pkt ids */
  74         struct list_head queue_list;            /* packets in queue */
  75 };
  76
  77 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
  78
  79 static int nfnl_queue_net_id __read_mostly;
  80
  81 #define INSTANCE_BUCKETS        16
  82 struct nfnl_queue_net {
  83         spinlock_t instances_lock;
  84         struct hlist_head instance_table[INSTANCE_BUCKETS];
  85 };
  86
  87 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
  88 {
  89         return net_generic(net, nfnl_queue_net_id);
  90 }
  91
  92 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
  93 {
  94         return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
  95 }
  96
  97 static struct nfqnl_instance *
  98 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
  99 {
 100         struct hlist_head *head;
 101         struct nfqnl_instance *inst;
 102
 103         head = &q->instance_table[instance_hashfn(queue_num)];
 104         hlist_for_each_entry_rcu(inst, head, hlist) {
 105                 if (inst->queue_num == queue_num)
 106                         return inst;
 107         }
 108         return NULL;
 109 }
 110
 111 static struct nfqnl_instance *
 112 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
 113                 int 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->sk_state == TCP_TIME_WAIT)
 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 struct sk_buff *
 282 nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
 283                            struct nf_queue_entry *entry,
 284                            __be32 **packet_id_ptr)
 285 {
 286         size_t size;
 287         size_t data_len = 0, cap_len = 0;
 288         unsigned int hlen = 0;
 289         struct sk_buff *skb;
 290         struct nlattr *nla;
 291         struct nfqnl_msg_packet_hdr *pmsg;
 292         struct nlmsghdr *nlh;
 293         struct nfgenmsg *nfmsg;
 294         struct sk_buff *entskb = entry->skb;
 295         struct net_device *indev;
 296         struct net_device *outdev;
 297         struct nf_conn *ct = NULL;
 298         enum ip_conntrack_info uninitialized_var(ctinfo);
 299         bool csum_verify;
 300
 301         size =    nlmsg_total_size(sizeof(struct nfgenmsg))
 302                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
 303                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 304                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 305 #ifdef CONFIG_BRIDGE_NETFILTER
 306                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 307                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 308 #endif
 309                 + nla_total_size(sizeof(u_int32_t))     /* mark */
 310                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
 311                 + nla_total_size(sizeof(u_int32_t))     /* skbinfo */
 312                 + nla_total_size(sizeof(u_int32_t));    /* cap_len */
 313
 314         if (entskb->tstamp.tv64)
 315                 size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
 316
 317         if (entry->hook <= NF_INET_FORWARD ||
 318            (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
 319                 csum_verify = !skb_csum_unnecessary(entskb);
 320         else
 321                 csum_verify = false;
 322
 323         outdev = entry->outdev;
 324
 325         switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
 326         case NFQNL_COPY_META:
 327         case NFQNL_COPY_NONE:
 328                 break;
 329
 330         case NFQNL_COPY_PACKET:
 331                 if (!(queue->flags & NFQA_CFG_F_GSO) &&
 332                     entskb->ip_summed == CHECKSUM_PARTIAL &&
 333                     skb_checksum_help(entskb))
 334                         return NULL;
 335
 336                 data_len = ACCESS_ONCE(queue->copy_range);
 337                 if (data_len > entskb->len)
 338                         data_len = entskb->len;
 339
 340                 hlen = skb_zerocopy_headlen(entskb);
 341                 hlen = min_t(unsigned int, hlen, data_len);
 342                 size += sizeof(struct nlattr) + hlen;
 343                 cap_len = entskb->len;
 344                 break;
 345         }
 346
 347         if (queue->flags & NFQA_CFG_F_CONNTRACK)
 348                 ct = nfqnl_ct_get(entskb, &size, &ctinfo);
 349
 350         if (queue->flags & NFQA_CFG_F_UID_GID) {
 351                 size +=  (nla_total_size(sizeof(u_int32_t))     /* uid */
 352                         + nla_total_size(sizeof(u_int32_t)));   /* gid */
 353         }
 354
 355         skb = nfnetlink_alloc_skb(net, size, queue->peer_portid,
 356                                   GFP_ATOMIC);
 357         if (!skb) {
 358                 skb_tx_error(entskb);
 359                 return NULL;
 360         }
 361
 362         nlh = nlmsg_put(skb, 0, 0,
 363                         NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
 364                         sizeof(struct nfgenmsg), 0);
 365         if (!nlh) {
 366                 skb_tx_error(entskb);
 367                 kfree_skb(skb);
 368                 return NULL;
 369         }
 370         nfmsg = nlmsg_data(nlh);
 371         nfmsg->nfgen_family = entry->pf;
 372         nfmsg->version = NFNETLINK_V0;
 373         nfmsg->res_id = htons(queue->queue_num);
 374
 375         nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
 376         pmsg = nla_data(nla);
 377         pmsg->hw_protocol       = entskb->protocol;
 378         pmsg->hook              = entry->hook;
 379         *packet_id_ptr          = &pmsg->packet_id;
 380
 381         indev = entry->indev;
 382         if (indev) {
 383 #ifndef CONFIG_BRIDGE_NETFILTER
 384                 if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
 385                         goto nla_put_failure;
 386 #else
 387                 if (entry->pf == PF_BRIDGE) {
 388                         /* Case 1: indev is physical input device, we need to
 389                          * look for bridge group (when called from
 390                          * netfilter_bridge) */
 391                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 392                                          htonl(indev->ifindex)) ||
 393                         /* this is the bridge group "brX" */
 394                         /* rcu_read_lock()ed by __nf_queue */
 395                             nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 396                                          htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
 397                                 goto nla_put_failure;
 398                 } else {
 399                         /* Case 2: indev is bridge group, we need to look for
 400                          * physical device (when called from ipv4) */
 401                         if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 402                                          htonl(indev->ifindex)))
 403                                 goto nla_put_failure;
 404                         if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
 405                             nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 406                                          htonl(entskb->nf_bridge->physindev->ifindex)))
 407                                 goto nla_put_failure;
 408                 }
 409 #endif
 410         }
 411
 412         if (outdev) {
 413 #ifndef CONFIG_BRIDGE_NETFILTER
 414                 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
 415                         goto nla_put_failure;
 416 #else
 417                 if (entry->pf == PF_BRIDGE) {
 418                         /* Case 1: outdev is physical output device, we need to
 419                          * look for bridge group (when called from
 420                          * netfilter_bridge) */
 421                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 422                                          htonl(outdev->ifindex)) ||
 423                         /* this is the bridge group "brX" */
 424                         /* rcu_read_lock()ed by __nf_queue */
 425                             nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 426                                          htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
 427                                 goto nla_put_failure;
 428                 } else {
 429                         /* Case 2: outdev is bridge group, we need to look for
 430                          * physical output device (when called from ipv4) */
 431                         if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 432                                          htonl(outdev->ifindex)))
 433                                 goto nla_put_failure;
 434                         if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
 435                             nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 436                                          htonl(entskb->nf_bridge->physoutdev->ifindex)))
 437                                 goto nla_put_failure;
 438                 }
 439 #endif
 440         }
 441
 442         if (entskb->mark &&
 443             nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
 444                 goto nla_put_failure;
 445
 446         if (indev && entskb->dev &&
 447             entskb->mac_header != entskb->network_header) {
 448                 struct nfqnl_msg_packet_hw phw;
 449                 int len;
 450
 451                 memset(&phw, 0, sizeof(phw));
 452                 len = dev_parse_header(entskb, phw.hw_addr);
 453                 if (len) {
 454                         phw.hw_addrlen = htons(len);
 455                         if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
 456                                 goto nla_put_failure;
 457                 }
 458         }
 459
 460         if (entskb->tstamp.tv64) {
 461                 struct nfqnl_msg_packet_timestamp ts;
 462                 struct timeval tv = ktime_to_timeval(entskb->tstamp);
 463                 ts.sec = cpu_to_be64(tv.tv_sec);
 464                 ts.usec = cpu_to_be64(tv.tv_usec);
 465
 466                 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
 467                         goto nla_put_failure;
 468         }
 469
 470         if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
 471             nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
 472                 goto nla_put_failure;
 473
 474         if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
 475                 goto nla_put_failure;
 476
 477         if (cap_len > data_len &&
 478             nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
 479                 goto nla_put_failure;
 480
 481         if (nfqnl_put_packet_info(skb, entskb, csum_verify))
 482                 goto nla_put_failure;
 483
 484         if (data_len) {
 485                 struct nlattr *nla;
 486
 487                 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
 488                         goto nla_put_failure;
 489
 490                 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
 491                 nla->nla_type = NFQA_PAYLOAD;
 492                 nla->nla_len = nla_attr_size(data_len);
 493
 494                 if (skb_zerocopy(skb, entskb, data_len, hlen))
 495                         goto nla_put_failure;
 496         }
 497
 498         nlh->nlmsg_len = skb->len;
 499         return skb;
 500
 501 nla_put_failure:
 502         skb_tx_error(entskb);
 503         kfree_skb(skb);
 504         net_err_ratelimited("nf_queue: error creating packet message\n");
 505         return NULL;
 506 }
 507
 508 static int
 509 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
 510                         struct nf_queue_entry *entry)
 511 {
 512         struct sk_buff *nskb;
 513         int err = -ENOBUFS;
 514         __be32 *packet_id_ptr;
 515         int failopen = 0;
 516
 517         nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
 518         if (nskb == NULL) {
 519                 err = -ENOMEM;
 520                 goto err_out;
 521         }
 522         spin_lock_bh(&queue->lock);
 523
 524         if (queue->queue_total >= queue->queue_maxlen) {
 525                 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
 526                         failopen = 1;
 527                         err = 0;
 528                 } else {
 529                         queue->queue_dropped++;
 530                         net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
 531                                              queue->queue_total);
 532                 }
 533                 goto err_out_free_nskb;
 534         }
 535         entry->id = ++queue->id_sequence;
 536         *packet_id_ptr = htonl(entry->id);
 537
 538         /* nfnetlink_unicast will either free the nskb or add it to a socket */
 539         err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
 540         if (err < 0) {
 541                 queue->queue_user_dropped++;
 542                 goto err_out_unlock;
 543         }
 544
 545         __enqueue_entry(queue, entry);
 546
 547         spin_unlock_bh(&queue->lock);
 548         return 0;
 549
 550 err_out_free_nskb:
 551         kfree_skb(nskb);
 552 err_out_unlock:
 553         spin_unlock_bh(&queue->lock);
 554         if (failopen)
 555                 nf_reinject(entry, NF_ACCEPT);
 556 err_out:
 557         return err;
 558 }
 559
 560 static struct nf_queue_entry *
 561 nf_queue_entry_dup(struct nf_queue_entry *e)
 562 {
 563         struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
 564         if (entry) {
 565                 if (nf_queue_entry_get_refs(entry))
 566                         return entry;
 567                 kfree(entry);
 568         }
 569         return NULL;
 570 }
 571
 572 #ifdef CONFIG_BRIDGE_NETFILTER
 573 /* When called from bridge netfilter, skb->data must point to MAC header
 574  * before calling skb_gso_segment(). Else, original MAC header is lost
 575  * and segmented skbs will be sent to wrong destination.
 576  */
 577 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
 578 {
 579         if (skb->nf_bridge)
 580                 __skb_push(skb, skb->network_header - skb->mac_header);
 581 }
 582
 583 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
 584 {
 585         if (skb->nf_bridge)
 586                 __skb_pull(skb, skb->network_header - skb->mac_header);
 587 }
 588 #else
 589 #define nf_bridge_adjust_skb_data(s) do {} while (0)
 590 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
 591 #endif
 592
 593 static void free_entry(struct nf_queue_entry *entry)
 594 {
 595         nf_queue_entry_release_refs(entry);
 596         kfree(entry);
 597 }
 598
 599 static int
 600 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
 601                            struct sk_buff *skb, struct nf_queue_entry *entry)
 602 {
 603         int ret = -ENOMEM;
 604         struct nf_queue_entry *entry_seg;
 605
 606         nf_bridge_adjust_segmented_data(skb);
 607
 608         if (skb->next == NULL) { /* last packet, no need to copy entry */
 609                 struct sk_buff *gso_skb = entry->skb;
 610                 entry->skb = skb;
 611                 ret = __nfqnl_enqueue_packet(net, queue, entry);
 612                 if (ret)
 613                         entry->skb = gso_skb;
 614                 return ret;
 615         }
 616
 617         skb->next = NULL;
 618
 619         entry_seg = nf_queue_entry_dup(entry);
 620         if (entry_seg) {
 621                 entry_seg->skb = skb;
 622                 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
 623                 if (ret)
 624                         free_entry(entry_seg);
 625         }
 626         return ret;
 627 }
 628
 629 static int
 630 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 631 {
 632         unsigned int queued;
 633         struct nfqnl_instance *queue;
 634         struct sk_buff *skb, *segs;
 635         int err = -ENOBUFS;
 636         struct net *net = dev_net(entry->indev ?
 637                                   entry->indev : entry->outdev);
 638         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 639
 640         /* rcu_read_lock()ed by nf_hook_slow() */
 641         queue = instance_lookup(q, queuenum);
 642         if (!queue)
 643                 return -ESRCH;
 644
 645         if (queue->copy_mode == NFQNL_COPY_NONE)
 646                 return -EINVAL;
 647
 648         skb = entry->skb;
 649
 650         switch (entry->pf) {
 651         case NFPROTO_IPV4:
 652                 skb->protocol = htons(ETH_P_IP);
 653                 break;
 654         case NFPROTO_IPV6:
 655                 skb->protocol = htons(ETH_P_IPV6);
 656                 break;
 657         }
 658
 659         if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
 660                 return __nfqnl_enqueue_packet(net, queue, entry);
 661
 662         nf_bridge_adjust_skb_data(skb);
 663         segs = skb_gso_segment(skb, 0);
 664         /* Does not use PTR_ERR to limit the number of error codes that can be
 665          * returned by nf_queue.  For instance, callers rely on -ECANCELED to
 666          * mean 'ignore this hook'.
 667          */
 668         if (IS_ERR(segs))
 669                 goto out_err;
 670         queued = 0;
 671         err = 0;
 672         do {
 673                 struct sk_buff *nskb = segs->next;
 674                 if (err == 0)
 675                         err = __nfqnl_enqueue_packet_gso(net, queue,
 676                                                         segs, entry);
 677                 if (err == 0)
 678                         queued++;
 679                 else
 680                         kfree_skb(segs);
 681                 segs = nskb;
 682         } while (segs);
 683
 684         if (queued) {
 685                 if (err) /* some segments are already queued */
 686                         free_entry(entry);
 687                 kfree_skb(skb);
 688                 return 0;
 689         }
 690  out_err:
 691         nf_bridge_adjust_segmented_data(skb);
 692         return err;
 693 }
 694
 695 static int
 696 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
 697 {
 698         struct sk_buff *nskb;
 699
 700         if (diff < 0) {
 701                 if (pskb_trim(e->skb, data_len))
 702                         return -ENOMEM;
 703         } else if (diff > 0) {
 704                 if (data_len > 0xFFFF)
 705                         return -EINVAL;
 706                 if (diff > skb_tailroom(e->skb)) {
 707                         nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
 708                                                diff, GFP_ATOMIC);
 709                         if (!nskb) {
 710                                 printk(KERN_WARNING "nf_queue: OOM "
 711                                       "in mangle, dropping packet\n");
 712                                 return -ENOMEM;
 713                         }
 714                         kfree_skb(e->skb);
 715                         e->skb = nskb;
 716                 }
 717                 skb_put(e->skb, diff);
 718         }
 719         if (!skb_make_writable(e->skb, data_len))
 720                 return -ENOMEM;
 721         skb_copy_to_linear_data(e->skb, data, data_len);
 722         e->skb->ip_summed = CHECKSUM_NONE;
 723         return 0;
 724 }
 725
 726 static int
 727 nfqnl_set_mode(struct nfqnl_instance *queue,
 728                unsigned char mode, unsigned int range)
 729 {
 730         int status = 0;
 731
 732         spin_lock_bh(&queue->lock);
 733         switch (mode) {
 734         case NFQNL_COPY_NONE:
 735         case NFQNL_COPY_META:
 736                 queue->copy_mode = mode;
 737                 queue->copy_range = 0;
 738                 break;
 739
 740         case NFQNL_COPY_PACKET:
 741                 queue->copy_mode = mode;
 742                 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
 743                         queue->copy_range = NFQNL_MAX_COPY_RANGE;
 744                 else
 745                         queue->copy_range = range;
 746                 break;
 747
 748         default:
 749                 status = -EINVAL;
 750
 751         }
 752         spin_unlock_bh(&queue->lock);
 753
 754         return status;
 755 }
 756
 757 static int
 758 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
 759 {
 760         if (entry->indev)
 761                 if (entry->indev->ifindex == ifindex)
 762                         return 1;
 763         if (entry->outdev)
 764                 if (entry->outdev->ifindex == ifindex)
 765                         return 1;
 766 #ifdef CONFIG_BRIDGE_NETFILTER
 767         if (entry->skb->nf_bridge) {
 768                 if (entry->skb->nf_bridge->physindev &&
 769                     entry->skb->nf_bridge->physindev->ifindex == ifindex)
 770                         return 1;
 771                 if (entry->skb->nf_bridge->physoutdev &&
 772                     entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
 773                         return 1;
 774         }
 775 #endif
 776         return 0;
 777 }
 778
 779 /* drop all packets with either indev or outdev == ifindex from all queue
 780  * instances */
 781 static void
 782 nfqnl_dev_drop(struct net *net, int ifindex)
 783 {
 784         int i;
 785         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 786
 787         rcu_read_lock();
 788
 789         for (i = 0; i < INSTANCE_BUCKETS; i++) {
 790                 struct nfqnl_instance *inst;
 791                 struct hlist_head *head = &q->instance_table[i];
 792
 793                 hlist_for_each_entry_rcu(inst, head, hlist)
 794                         nfqnl_flush(inst, dev_cmp, ifindex);
 795         }
 796
 797         rcu_read_unlock();
 798 }
 799
 800 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
 801
 802 static int
 803 nfqnl_rcv_dev_event(struct notifier_block *this,
 804                     unsigned long event, void *ptr)
 805 {
 806         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 807
 808         /* Drop any packets associated with the downed device */
 809         if (event == NETDEV_DOWN)
 810                 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
 811         return NOTIFY_DONE;
 812 }
 813
 814 static struct notifier_block nfqnl_dev_notifier = {
 815         .notifier_call  = nfqnl_rcv_dev_event,
 816 };
 817
 818 static int
 819 nfqnl_rcv_nl_event(struct notifier_block *this,
 820                    unsigned long event, void *ptr)
 821 {
 822         struct netlink_notify *n = ptr;
 823         struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
 824
 825         if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
 826                 int i;
 827
 828                 /* destroy all instances for this portid */
 829                 spin_lock(&q->instances_lock);
 830                 for (i = 0; i < INSTANCE_BUCKETS; i++) {
 831                         struct hlist_node *t2;
 832                         struct nfqnl_instance *inst;
 833                         struct hlist_head *head = &q->instance_table[i];
 834
 835                         hlist_for_each_entry_safe(inst, t2, head, hlist) {
 836                                 if (n->portid == inst->peer_portid)
 837                                         __instance_destroy(inst);
 838                         }
 839                 }
 840                 spin_unlock(&q->instances_lock);
 841         }
 842         return NOTIFY_DONE;
 843 }
 844
 845 static struct notifier_block nfqnl_rtnl_notifier = {
 846         .notifier_call  = nfqnl_rcv_nl_event,
 847 };
 848
 849 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
 850         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 851         [NFQA_MARK]             = { .type = NLA_U32 },
 852         [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
 853         [NFQA_CT]               = { .type = NLA_UNSPEC },
 854         [NFQA_EXP]              = { .type = NLA_UNSPEC },
 855 };
 856
 857 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
 858         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 859         [NFQA_MARK]             = { .type = NLA_U32 },
 860 };
 861
 862 static struct nfqnl_instance *
 863 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
 864 {
 865         struct nfqnl_instance *queue;
 866
 867         queue = instance_lookup(q, queue_num);
 868         if (!queue)
 869                 return ERR_PTR(-ENODEV);
 870
 871         if (queue->peer_portid != nlportid)
 872                 return ERR_PTR(-EPERM);
 873
 874         return queue;
 875 }
 876
 877 static struct nfqnl_msg_verdict_hdr*
 878 verdicthdr_get(const struct nlattr * const nfqa[])
 879 {
 880         struct nfqnl_msg_verdict_hdr *vhdr;
 881         unsigned int verdict;
 882
 883         if (!nfqa[NFQA_VERDICT_HDR])
 884                 return NULL;
 885
 886         vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
 887         verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
 888         if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
 889                 return NULL;
 890         return vhdr;
 891 }
 892
 893 static int nfq_id_after(unsigned int id, unsigned int max)
 894 {
 895         return (int)(id - max) > 0;
 896 }
 897
 898 static int
 899 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
 900                    const struct nlmsghdr *nlh,
 901                    const struct nlattr * const nfqa[])
 902 {
 903         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 904         struct nf_queue_entry *entry, *tmp;
 905         unsigned int verdict, maxid;
 906         struct nfqnl_msg_verdict_hdr *vhdr;
 907         struct nfqnl_instance *queue;
 908         LIST_HEAD(batch_list);
 909         u16 queue_num = ntohs(nfmsg->res_id);
 910
 911         struct net *net = sock_net(ctnl);
 912         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 913
 914         queue = verdict_instance_lookup(q, queue_num,
 915                                         NETLINK_CB(skb).portid);
 916         if (IS_ERR(queue))
 917                 return PTR_ERR(queue);
 918
 919         vhdr = verdicthdr_get(nfqa);
 920         if (!vhdr)
 921                 return -EINVAL;
 922
 923         verdict = ntohl(vhdr->verdict);
 924         maxid = ntohl(vhdr->id);
 925
 926         spin_lock_bh(&queue->lock);
 927
 928         list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
 929                 if (nfq_id_after(entry->id, maxid))
 930                         break;
 931                 __dequeue_entry(queue, entry);
 932                 list_add_tail(&entry->list, &batch_list);
 933         }
 934
 935         spin_unlock_bh(&queue->lock);
 936
 937         if (list_empty(&batch_list))
 938                 return -ENOENT;
 939
 940         list_for_each_entry_safe(entry, tmp, &batch_list, list) {
 941                 if (nfqa[NFQA_MARK])
 942                         entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 943                 nf_reinject(entry, verdict);
 944         }
 945         return 0;
 946 }
 947
 948 static int
 949 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
 950                    const struct nlmsghdr *nlh,
 951                    const struct nlattr * const nfqa[])
 952 {
 953         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 954         u_int16_t queue_num = ntohs(nfmsg->res_id);
 955
 956         struct nfqnl_msg_verdict_hdr *vhdr;
 957         struct nfqnl_instance *queue;
 958         unsigned int verdict;
 959         struct nf_queue_entry *entry;
 960         enum ip_conntrack_info uninitialized_var(ctinfo);
 961         struct nf_conn *ct = NULL;
 962
 963         struct net *net = sock_net(ctnl);
 964         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 965
 966         queue = instance_lookup(q, queue_num);
 967         if (!queue)
 968                 queue = verdict_instance_lookup(q, queue_num,
 969                                                 NETLINK_CB(skb).portid);
 970         if (IS_ERR(queue))
 971                 return PTR_ERR(queue);
 972
 973         vhdr = verdicthdr_get(nfqa);
 974         if (!vhdr)
 975                 return -EINVAL;
 976
 977         verdict = ntohl(vhdr->verdict);
 978
 979         entry = find_dequeue_entry(queue, ntohl(vhdr->id));
 980         if (entry == NULL)
 981                 return -ENOENT;
 982
 983         if (nfqa[NFQA_CT]) {
 984                 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
 985                 if (ct && nfqa[NFQA_EXP]) {
 986                         nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
 987                                             NETLINK_CB(skb).portid,
 988                                             nlmsg_report(nlh));
 989                 }
 990         }
 991
 992         if (nfqa[NFQA_PAYLOAD]) {
 993                 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
 994                 int diff = payload_len - entry->skb->len;
 995
 996                 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
 997                                  payload_len, entry, diff) < 0)
 998                         verdict = NF_DROP;
 999
1000                 if (ct)
1001                         nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
1002         }
1003
1004         if (nfqa[NFQA_MARK])
1005                 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1006
1007         nf_reinject(entry, verdict);
1008         return 0;
1009 }
1010
1011 static int
1012 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1013                   const struct nlmsghdr *nlh,
1014                   const struct nlattr * const nfqa[])
1015 {
1016         return -ENOTSUPP;
1017 }
1018
1019 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1020         [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1021         [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
1022 };
1023
1024 static const struct nf_queue_handler nfqh = {
1025         .outfn  = &nfqnl_enqueue_packet,
1026 };
1027
1028 static int
1029 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1030                   const struct nlmsghdr *nlh,
1031                   const struct nlattr * const nfqa[])
1032 {
1033         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1034         u_int16_t queue_num = ntohs(nfmsg->res_id);
1035         struct nfqnl_instance *queue;
1036         struct nfqnl_msg_config_cmd *cmd = NULL;
1037         struct net *net = sock_net(ctnl);
1038         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1039         int ret = 0;
1040
1041         if (nfqa[NFQA_CFG_CMD]) {
1042                 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1043
1044                 /* Obsolete commands without queue context */
1045                 switch (cmd->command) {
1046                 case NFQNL_CFG_CMD_PF_BIND: return 0;
1047                 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1048                 }
1049         }
1050
1051         rcu_read_lock();
1052         queue = instance_lookup(q, queue_num);
1053         if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1054                 ret = -EPERM;
1055                 goto err_out_unlock;
1056         }
1057
1058         if (cmd != NULL) {
1059                 switch (cmd->command) {
1060                 case NFQNL_CFG_CMD_BIND:
1061                         if (queue) {
1062                                 ret = -EBUSY;
1063                                 goto err_out_unlock;
1064                         }
1065                         queue = instance_create(q, queue_num,
1066                                                 NETLINK_CB(skb).portid);
1067                         if (IS_ERR(queue)) {
1068                                 ret = PTR_ERR(queue);
1069                                 goto err_out_unlock;
1070                         }
1071                         break;
1072                 case NFQNL_CFG_CMD_UNBIND:
1073                         if (!queue) {
1074                                 ret = -ENODEV;
1075                                 goto err_out_unlock;
1076                         }
1077                         instance_destroy(q, queue);
1078                         break;
1079                 case NFQNL_CFG_CMD_PF_BIND:
1080                 case NFQNL_CFG_CMD_PF_UNBIND:
1081                         break;
1082                 default:
1083                         ret = -ENOTSUPP;
1084                         break;
1085                 }
1086         }
1087
1088         if (nfqa[NFQA_CFG_PARAMS]) {
1089                 struct nfqnl_msg_config_params *params;
1090
1091                 if (!queue) {
1092                         ret = -ENODEV;
1093                         goto err_out_unlock;
1094                 }
1095                 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1096                 nfqnl_set_mode(queue, params->copy_mode,
1097                                 ntohl(params->copy_range));
1098         }
1099
1100         if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1101                 __be32 *queue_maxlen;
1102
1103                 if (!queue) {
1104                         ret = -ENODEV;
1105                         goto err_out_unlock;
1106                 }
1107                 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1108                 spin_lock_bh(&queue->lock);
1109                 queue->queue_maxlen = ntohl(*queue_maxlen);
1110                 spin_unlock_bh(&queue->lock);
1111         }
1112
1113         if (nfqa[NFQA_CFG_FLAGS]) {
1114                 __u32 flags, mask;
1115
1116                 if (!queue) {
1117                         ret = -ENODEV;
1118                         goto err_out_unlock;
1119                 }
1120
1121                 if (!nfqa[NFQA_CFG_MASK]) {
1122                         /* A mask is needed to specify which flags are being
1123                          * changed.
1124                          */
1125                         ret = -EINVAL;
1126                         goto err_out_unlock;
1127                 }
1128
1129                 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1130                 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1131
1132                 if (flags >= NFQA_CFG_F_MAX) {
1133                         ret = -EOPNOTSUPP;
1134                         goto err_out_unlock;
1135                 }
1136
1137                 spin_lock_bh(&queue->lock);
1138                 queue->flags &= ~mask;
1139                 queue->flags |= flags & mask;
1140                 spin_unlock_bh(&queue->lock);
1141         }
1142
1143 err_out_unlock:
1144         rcu_read_unlock();
1145         return ret;
1146 }
1147
1148 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1149         [NFQNL_MSG_PACKET]      = { .call_rcu = nfqnl_recv_unsupp,
1150                                     .attr_count = NFQA_MAX, },
1151         [NFQNL_MSG_VERDICT]     = { .call_rcu = nfqnl_recv_verdict,
1152                                     .attr_count = NFQA_MAX,
1153                                     .policy = nfqa_verdict_policy },
1154         [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
1155                                     .attr_count = NFQA_CFG_MAX,
1156                                     .policy = nfqa_cfg_policy },
1157         [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1158                                     .attr_count = NFQA_MAX,
1159                                     .policy = nfqa_verdict_batch_policy },
1160 };
1161
1162 static const struct nfnetlink_subsystem nfqnl_subsys = {
1163         .name           = "nf_queue",
1164         .subsys_id      = NFNL_SUBSYS_QUEUE,
1165         .cb_count       = NFQNL_MSG_MAX,
1166         .cb             = nfqnl_cb,
1167 };
1168
1169 #ifdef CONFIG_PROC_FS
1170 struct iter_state {
1171         struct seq_net_private p;
1172         unsigned int bucket;
1173 };
1174
1175 static struct hlist_node *get_first(struct seq_file *seq)
1176 {
1177         struct iter_state *st = seq->private;
1178         struct net *net;
1179         struct nfnl_queue_net *q;
1180
1181         if (!st)
1182                 return NULL;
1183
1184         net = seq_file_net(seq);
1185         q = nfnl_queue_pernet(net);
1186         for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1187                 if (!hlist_empty(&q->instance_table[st->bucket]))
1188                         return q->instance_table[st->bucket].first;
1189         }
1190         return NULL;
1191 }
1192
1193 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1194 {
1195         struct iter_state *st = seq->private;
1196         struct net *net = seq_file_net(seq);
1197
1198         h = h->next;
1199         while (!h) {
1200                 struct nfnl_queue_net *q;
1201
1202                 if (++st->bucket >= INSTANCE_BUCKETS)
1203                         return NULL;
1204
1205                 q = nfnl_queue_pernet(net);
1206                 h = q->instance_table[st->bucket].first;
1207         }
1208         return h;
1209 }
1210
1211 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1212 {
1213         struct hlist_node *head;
1214         head = get_first(seq);
1215
1216         if (head)
1217                 while (pos && (head = get_next(seq, head)))
1218                         pos--;
1219         return pos ? NULL : head;
1220 }
1221
1222 static void *seq_start(struct seq_file *s, loff_t *pos)
1223         __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1224 {
1225         spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1226         return get_idx(s, *pos);
1227 }
1228
1229 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1230 {
1231         (*pos)++;
1232         return get_next(s, v);
1233 }
1234
1235 static void seq_stop(struct seq_file *s, void *v)
1236         __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1237 {
1238         spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1239 }
1240
1241 static int seq_show(struct seq_file *s, void *v)
1242 {
1243         const struct nfqnl_instance *inst = v;
1244
1245         return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1246                           inst->queue_num,
1247                           inst->peer_portid, inst->queue_total,
1248                           inst->copy_mode, inst->copy_range,
1249                           inst->queue_dropped, inst->queue_user_dropped,
1250                           inst->id_sequence, 1);
1251 }
1252
1253 static const struct seq_operations nfqnl_seq_ops = {
1254         .start  = seq_start,
1255         .next   = seq_next,
1256         .stop   = seq_stop,
1257         .show   = seq_show,
1258 };
1259
1260 static int nfqnl_open(struct inode *inode, struct file *file)
1261 {
1262         return seq_open_net(inode, file, &nfqnl_seq_ops,
1263                         sizeof(struct iter_state));
1264 }
1265
1266 static const struct file_operations nfqnl_file_ops = {
1267         .owner   = THIS_MODULE,
1268         .open    = nfqnl_open,
1269         .read    = seq_read,
1270         .llseek  = seq_lseek,
1271         .release = seq_release_net,
1272 };
1273
1274 #endif /* PROC_FS */
1275
1276 static int __net_init nfnl_queue_net_init(struct net *net)
1277 {
1278         unsigned int i;
1279         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1280
1281         for (i = 0; i < INSTANCE_BUCKETS; i++)
1282                 INIT_HLIST_HEAD(&q->instance_table[i]);
1283
1284         spin_lock_init(&q->instances_lock);
1285
1286 #ifdef CONFIG_PROC_FS
1287         if (!proc_create("nfnetlink_queue", 0440,
1288                          net->nf.proc_netfilter, &nfqnl_file_ops))
1289                 return -ENOMEM;
1290 #endif
1291         return 0;
1292 }
1293
1294 static void __net_exit nfnl_queue_net_exit(struct net *net)
1295 {
1296 #ifdef CONFIG_PROC_FS
1297         remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1298 #endif
1299 }
1300
1301 static struct pernet_operations nfnl_queue_net_ops = {
1302         .init   = nfnl_queue_net_init,
1303         .exit   = nfnl_queue_net_exit,
1304         .id     = &nfnl_queue_net_id,
1305         .size   = sizeof(struct nfnl_queue_net),
1306 };
1307
1308 static int __init nfnetlink_queue_init(void)
1309 {
1310         int status = -ENOMEM;
1311
1312         netlink_register_notifier(&nfqnl_rtnl_notifier);
1313         status = nfnetlink_subsys_register(&nfqnl_subsys);
1314         if (status < 0) {
1315                 pr_err("nf_queue: failed to create netlink socket\n");
1316                 goto cleanup_netlink_notifier;
1317         }
1318
1319         status = register_pernet_subsys(&nfnl_queue_net_ops);
1320         if (status < 0) {
1321                 pr_err("nf_queue: failed to register pernet ops\n");
1322                 goto cleanup_subsys;
1323         }
1324         register_netdevice_notifier(&nfqnl_dev_notifier);
1325         nf_register_queue_handler(&nfqh);
1326         return status;
1327
1328 cleanup_subsys:
1329         nfnetlink_subsys_unregister(&nfqnl_subsys);
1330 cleanup_netlink_notifier:
1331         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1332         return status;
1333 }
1334
1335 static void __exit nfnetlink_queue_fini(void)
1336 {
1337         nf_unregister_queue_handler();
1338         unregister_netdevice_notifier(&nfqnl_dev_notifier);
1339         unregister_pernet_subsys(&nfnl_queue_net_ops);
1340         nfnetlink_subsys_unregister(&nfqnl_subsys);
1341         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1342
1343         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1344 }
1345
1346 MODULE_DESCRIPTION("netfilter packet queue handler");
1347 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1348 MODULE_LICENSE("GPL");
1349 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1350
1351 module_init(nfnetlink_queue_init);
1352 module_exit(nfnetlink_queue_fini);