kernel/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_bridge.h>
  29 #include <linux/netfilter/nfnetlink.h>
  30 #include <linux/netfilter/nfnetlink_queue.h>
  31 #include <linux/list.h>
  32 #include <net/sock.h>
  33 #include <net/tcp_states.h>
  34 #include <net/netfilter/nf_queue.h>
  35 #include <net/netns/generic.h>
  36 #include <net/netfilter/nfnetlink_queue.h>
  37
  38 #include <linux/atomic.h>
  39
  40 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
  41 #include "../bridge/br_private.h"
  42 #endif
  43
  44 #define NFQNL_QMAX_DEFAULT 1024
  45
  46 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len
  47  * includes the header length. Thus, the maximum packet length that we
  48  * support is 65531 bytes. We send truncated packets if the specified length
  49  * is larger than that.  Userspace can check for presence of NFQA_CAP_LEN
  50  * attribute to detect truncation.
  51  */
  52 #define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
  53
  54 struct nfqnl_instance {
  55         struct hlist_node hlist;                /* global list of queues */
  56         struct rcu_head rcu;
  57
  58         u32 peer_portid;
  59         unsigned int queue_maxlen;
  60         unsigned int copy_range;
  61         unsigned int queue_dropped;
  62         unsigned int queue_user_dropped;
  63
  64
  65         u_int16_t queue_num;                    /* number of this queue */
  66         u_int8_t copy_mode;
  67         u_int32_t flags;                        /* Set using NFQA_CFG_FLAGS */
  68 /*
  69  * Following fields are dirtied for each queued packet,
  70  * keep them in same cache line if possible.
  71  */
  72         spinlock_t      lock;
  73         unsigned int    queue_total;
  74         unsigned int    id_sequence;            /* 'sequence' of pkt ids */
  75         struct list_head queue_list;            /* packets in queue */
  76 };
  77
  78 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
  79
  80 static int nfnl_queue_net_id __read_mostly;
  81
  82 #define INSTANCE_BUCKETS        16
  83 struct nfnl_queue_net {
  84         spinlock_t instances_lock;
  85         struct hlist_head instance_table[INSTANCE_BUCKETS];
  86 };
  87
  88 static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
  89 {
  90         return net_generic(net, nfnl_queue_net_id);
  91 }
  92
  93 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
  94 {
  95         return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
  96 }
  97
  98 static struct nfqnl_instance *
  99 instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
 100 {
 101         struct hlist_head *head;
 102         struct nfqnl_instance *inst;
 103
 104         head = &q->instance_table[instance_hashfn(queue_num)];
 105         hlist_for_each_entry_rcu(inst, head, hlist) {
 106                 if (inst->queue_num == queue_num)
 107                         return inst;
 108         }
 109         return NULL;
 110 }
 111
 112 static struct nfqnl_instance *
 113 instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, u32 portid)
 114 {
 115         struct nfqnl_instance *inst;
 116         unsigned int h;
 117         int err;
 118
 119         spin_lock(&q->instances_lock);
 120         if (instance_lookup(q, queue_num)) {
 121                 err = -EEXIST;
 122                 goto out_unlock;
 123         }
 124
 125         inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
 126         if (!inst) {
 127                 err = -ENOMEM;
 128                 goto out_unlock;
 129         }
 130
 131         inst->queue_num = queue_num;
 132         inst->peer_portid = portid;
 133         inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
 134         inst->copy_range = NFQNL_MAX_COPY_RANGE;
 135         inst->copy_mode = NFQNL_COPY_NONE;
 136         spin_lock_init(&inst->lock);
 137         INIT_LIST_HEAD(&inst->queue_list);
 138
 139         if (!try_module_get(THIS_MODULE)) {
 140                 err = -EAGAIN;
 141                 goto out_free;
 142         }
 143
 144         h = instance_hashfn(queue_num);
 145         hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
 146
 147         spin_unlock(&q->instances_lock);
 148
 149         return inst;
 150
 151 out_free:
 152         kfree(inst);
 153 out_unlock:
 154         spin_unlock(&q->instances_lock);
 155         return ERR_PTR(err);
 156 }
 157
 158 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
 159                         unsigned long data);
 160
 161 static void
 162 instance_destroy_rcu(struct rcu_head *head)
 163 {
 164         struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
 165                                                    rcu);
 166
 167         nfqnl_flush(inst, NULL, 0);
 168         kfree(inst);
 169         module_put(THIS_MODULE);
 170 }
 171
 172 static void
 173 __instance_destroy(struct nfqnl_instance *inst)
 174 {
 175         hlist_del_rcu(&inst->hlist);
 176         call_rcu(&inst->rcu, instance_destroy_rcu);
 177 }
 178
 179 static void
 180 instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
 181 {
 182         spin_lock(&q->instances_lock);
 183         __instance_destroy(inst);
 184         spin_unlock(&q->instances_lock);
 185 }
 186
 187 static inline void
 188 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 189 {
 190        list_add_tail(&entry->list, &queue->queue_list);
 191        queue->queue_total++;
 192 }
 193
 194 static void
 195 __dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 196 {
 197         list_del(&entry->list);
 198         queue->queue_total--;
 199 }
 200
 201 static struct nf_queue_entry *
 202 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
 203 {
 204         struct nf_queue_entry *entry = NULL, *i;
 205
 206         spin_lock_bh(&queue->lock);
 207
 208         list_for_each_entry(i, &queue->queue_list, list) {
 209                 if (i->id == id) {
 210                         entry = i;
 211                         break;
 212                 }
 213         }
 214
 215         if (entry)
 216                 __dequeue_entry(queue, entry);
 217
 218         spin_unlock_bh(&queue->lock);
 219
 220         return entry;
 221 }
 222
 223 static void
 224 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
 225 {
 226         struct nf_queue_entry *entry, *next;
 227
 228         spin_lock_bh(&queue->lock);
 229         list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
 230                 if (!cmpfn || cmpfn(entry, data)) {
 231                         list_del(&entry->list);
 232                         queue->queue_total--;
 233                         nf_reinject(entry, NF_DROP);
 234                 }
 235         }
 236         spin_unlock_bh(&queue->lock);
 237 }
 238
 239 static int
 240 nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
 241                       bool csum_verify)
 242 {
 243         __u32 flags = 0;
 244
 245         if (packet->ip_summed == CHECKSUM_PARTIAL)
 246                 flags = NFQA_SKB_CSUMNOTREADY;
 247         else if (csum_verify)
 248                 flags = NFQA_SKB_CSUM_NOTVERIFIED;
 249
 250         if (skb_is_gso(packet))
 251                 flags |= NFQA_SKB_GSO;
 252
 253         return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
 254 }
 255
 256 static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk)
 257 {
 258         const struct cred *cred;
 259
 260         if (!sk_fullsock(sk))
 261                 return 0;
 262
 263         read_lock_bh(&sk->sk_callback_lock);
 264         if (sk->sk_socket && sk->sk_socket->file) {
 265                 cred = sk->sk_socket->file->f_cred;
 266                 if (nla_put_be32(skb, NFQA_UID,
 267                     htonl(from_kuid_munged(&init_user_ns, cred->fsuid))))
 268                         goto nla_put_failure;
 269                 if (nla_put_be32(skb, NFQA_GID,
 270                     htonl(from_kgid_munged(&init_user_ns, cred->fsgid))))
 271                         goto nla_put_failure;
 272         }
 273         read_unlock_bh(&sk->sk_callback_lock);
 274         return 0;
 275
 276 nla_put_failure:
 277         read_unlock_bh(&sk->sk_callback_lock);
 278         return -1;
 279 }
 280
 281 static 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 #if IS_ENABLED(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->state.hook <= NF_INET_FORWARD ||
 318            (entry->state.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->state.out;
 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->state.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->state.hook;
 379         *packet_id_ptr          = &pmsg->packet_id;
 380
 381         indev = entry->state.in;
 382         if (indev) {
 383 #if !IS_ENABLED(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->state.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                         int physinif;
 400
 401                         /* Case 2: indev is bridge group, we need to look for
 402                          * physical device (when called from ipv4) */
 403                         if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 404                                          htonl(indev->ifindex)))
 405                                 goto nla_put_failure;
 406
 407                         physinif = nf_bridge_get_physinif(entskb);
 408                         if (physinif &&
 409                             nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 410                                          htonl(physinif)))
 411                                 goto nla_put_failure;
 412                 }
 413 #endif
 414         }
 415
 416         if (outdev) {
 417 #if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 418                 if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
 419                         goto nla_put_failure;
 420 #else
 421                 if (entry->state.pf == PF_BRIDGE) {
 422                         /* Case 1: outdev is physical output device, we need to
 423                          * look for bridge group (when called from
 424                          * netfilter_bridge) */
 425                         if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 426                                          htonl(outdev->ifindex)) ||
 427                         /* this is the bridge group "brX" */
 428                         /* rcu_read_lock()ed by __nf_queue */
 429                             nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 430                                          htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
 431                                 goto nla_put_failure;
 432                 } else {
 433                         int physoutif;
 434
 435                         /* Case 2: outdev is bridge group, we need to look for
 436                          * physical output device (when called from ipv4) */
 437                         if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 438                                          htonl(outdev->ifindex)))
 439                                 goto nla_put_failure;
 440
 441                         physoutif = nf_bridge_get_physoutif(entskb);
 442                         if (physoutif &&
 443                             nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 444                                          htonl(physoutif)))
 445                                 goto nla_put_failure;
 446                 }
 447 #endif
 448         }
 449
 450         if (entskb->mark &&
 451             nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
 452                 goto nla_put_failure;
 453
 454         if (indev && entskb->dev &&
 455             entskb->mac_header != entskb->network_header) {
 456                 struct nfqnl_msg_packet_hw phw;
 457                 int len;
 458
 459                 memset(&phw, 0, sizeof(phw));
 460                 len = dev_parse_header(entskb, phw.hw_addr);
 461                 if (len) {
 462                         phw.hw_addrlen = htons(len);
 463                         if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
 464                                 goto nla_put_failure;
 465                 }
 466         }
 467
 468         if (entskb->tstamp.tv64) {
 469                 struct nfqnl_msg_packet_timestamp ts;
 470                 struct timeval tv = ktime_to_timeval(entskb->tstamp);
 471                 ts.sec = cpu_to_be64(tv.tv_sec);
 472                 ts.usec = cpu_to_be64(tv.tv_usec);
 473
 474                 if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
 475                         goto nla_put_failure;
 476         }
 477
 478         if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk &&
 479             nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
 480                 goto nla_put_failure;
 481
 482         if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
 483                 goto nla_put_failure;
 484
 485         if (cap_len > data_len &&
 486             nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
 487                 goto nla_put_failure;
 488
 489         if (nfqnl_put_packet_info(skb, entskb, csum_verify))
 490                 goto nla_put_failure;
 491
 492         if (data_len) {
 493                 struct nlattr *nla;
 494
 495                 if (skb_tailroom(skb) < sizeof(*nla) + hlen)
 496                         goto nla_put_failure;
 497
 498                 nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
 499                 nla->nla_type = NFQA_PAYLOAD;
 500                 nla->nla_len = nla_attr_size(data_len);
 501
 502                 if (skb_zerocopy(skb, entskb, data_len, hlen))
 503                         goto nla_put_failure;
 504         }
 505
 506         nlh->nlmsg_len = skb->len;
 507         return skb;
 508
 509 nla_put_failure:
 510         skb_tx_error(entskb);
 511         kfree_skb(skb);
 512         net_err_ratelimited("nf_queue: error creating packet message\n");
 513         return NULL;
 514 }
 515
 516 static int
 517 __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
 518                         struct nf_queue_entry *entry)
 519 {
 520         struct sk_buff *nskb;
 521         int err = -ENOBUFS;
 522         __be32 *packet_id_ptr;
 523         int failopen = 0;
 524
 525         nskb = nfqnl_build_packet_message(net, queue, entry, &packet_id_ptr);
 526         if (nskb == NULL) {
 527                 err = -ENOMEM;
 528                 goto err_out;
 529         }
 530         spin_lock_bh(&queue->lock);
 531
 532         if (queue->queue_total >= queue->queue_maxlen) {
 533                 if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
 534                         failopen = 1;
 535                         err = 0;
 536                 } else {
 537                         queue->queue_dropped++;
 538                         net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
 539                                              queue->queue_total);
 540                 }
 541                 goto err_out_free_nskb;
 542         }
 543         entry->id = ++queue->id_sequence;
 544         *packet_id_ptr = htonl(entry->id);
 545
 546         /* nfnetlink_unicast will either free the nskb or add it to a socket */
 547         err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
 548         if (err < 0) {
 549                 queue->queue_user_dropped++;
 550                 goto err_out_unlock;
 551         }
 552
 553         __enqueue_entry(queue, entry);
 554
 555         spin_unlock_bh(&queue->lock);
 556         return 0;
 557
 558 err_out_free_nskb:
 559         kfree_skb(nskb);
 560 err_out_unlock:
 561         spin_unlock_bh(&queue->lock);
 562         if (failopen)
 563                 nf_reinject(entry, NF_ACCEPT);
 564 err_out:
 565         return err;
 566 }
 567
 568 static struct nf_queue_entry *
 569 nf_queue_entry_dup(struct nf_queue_entry *e)
 570 {
 571         struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
 572         if (entry) {
 573                 if (nf_queue_entry_get_refs(entry))
 574                         return entry;
 575                 kfree(entry);
 576         }
 577         return NULL;
 578 }
 579
 580 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 581 /* When called from bridge netfilter, skb->data must point to MAC header
 582  * before calling skb_gso_segment(). Else, original MAC header is lost
 583  * and segmented skbs will be sent to wrong destination.
 584  */
 585 static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
 586 {
 587         if (skb->nf_bridge)
 588                 __skb_push(skb, skb->network_header - skb->mac_header);
 589 }
 590
 591 static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
 592 {
 593         if (skb->nf_bridge)
 594                 __skb_pull(skb, skb->network_header - skb->mac_header);
 595 }
 596 #else
 597 #define nf_bridge_adjust_skb_data(s) do {} while (0)
 598 #define nf_bridge_adjust_segmented_data(s) do {} while (0)
 599 #endif
 600
 601 static void free_entry(struct nf_queue_entry *entry)
 602 {
 603         nf_queue_entry_release_refs(entry);
 604         kfree(entry);
 605 }
 606
 607 static int
 608 __nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
 609                            struct sk_buff *skb, struct nf_queue_entry *entry)
 610 {
 611         int ret = -ENOMEM;
 612         struct nf_queue_entry *entry_seg;
 613
 614         nf_bridge_adjust_segmented_data(skb);
 615
 616         if (skb->next == NULL) { /* last packet, no need to copy entry */
 617                 struct sk_buff *gso_skb = entry->skb;
 618                 entry->skb = skb;
 619                 ret = __nfqnl_enqueue_packet(net, queue, entry);
 620                 if (ret)
 621                         entry->skb = gso_skb;
 622                 return ret;
 623         }
 624
 625         skb->next = NULL;
 626
 627         entry_seg = nf_queue_entry_dup(entry);
 628         if (entry_seg) {
 629                 entry_seg->skb = skb;
 630                 ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
 631                 if (ret)
 632                         free_entry(entry_seg);
 633         }
 634         return ret;
 635 }
 636
 637 static int
 638 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 639 {
 640         unsigned int queued;
 641         struct nfqnl_instance *queue;
 642         struct sk_buff *skb, *segs;
 643         int err = -ENOBUFS;
 644         struct net *net = dev_net(entry->state.in ?
 645                                   entry->state.in : entry->state.out);
 646         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 647
 648         /* rcu_read_lock()ed by nf_hook_slow() */
 649         queue = instance_lookup(q, queuenum);
 650         if (!queue)
 651                 return -ESRCH;
 652
 653         if (queue->copy_mode == NFQNL_COPY_NONE)
 654                 return -EINVAL;
 655
 656         skb = entry->skb;
 657
 658         switch (entry->state.pf) {
 659         case NFPROTO_IPV4:
 660                 skb->protocol = htons(ETH_P_IP);
 661                 break;
 662         case NFPROTO_IPV6:
 663                 skb->protocol = htons(ETH_P_IPV6);
 664                 break;
 665         }
 666
 667         if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
 668                 return __nfqnl_enqueue_packet(net, queue, entry);
 669
 670         nf_bridge_adjust_skb_data(skb);
 671         segs = skb_gso_segment(skb, 0);
 672         /* Does not use PTR_ERR to limit the number of error codes that can be
 673          * returned by nf_queue.  For instance, callers rely on -ECANCELED to
 674          * mean 'ignore this hook'.
 675          */
 676         if (IS_ERR_OR_NULL(segs))
 677                 goto out_err;
 678         queued = 0;
 679         err = 0;
 680         do {
 681                 struct sk_buff *nskb = segs->next;
 682                 if (err == 0)
 683                         err = __nfqnl_enqueue_packet_gso(net, queue,
 684                                                         segs, entry);
 685                 if (err == 0)
 686                         queued++;
 687                 else
 688                         kfree_skb(segs);
 689                 segs = nskb;
 690         } while (segs);
 691
 692         if (queued) {
 693                 if (err) /* some segments are already queued */
 694                         free_entry(entry);
 695                 kfree_skb(skb);
 696                 return 0;
 697         }
 698  out_err:
 699         nf_bridge_adjust_segmented_data(skb);
 700         return err;
 701 }
 702
 703 static int
 704 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
 705 {
 706         struct sk_buff *nskb;
 707
 708         if (diff < 0) {
 709                 if (pskb_trim(e->skb, data_len))
 710                         return -ENOMEM;
 711         } else if (diff > 0) {
 712                 if (data_len > 0xFFFF)
 713                         return -EINVAL;
 714                 if (diff > skb_tailroom(e->skb)) {
 715                         nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
 716                                                diff, GFP_ATOMIC);
 717                         if (!nskb) {
 718                                 printk(KERN_WARNING "nf_queue: OOM "
 719                                       "in mangle, dropping packet\n");
 720                                 return -ENOMEM;
 721                         }
 722                         kfree_skb(e->skb);
 723                         e->skb = nskb;
 724                 }
 725                 skb_put(e->skb, diff);
 726         }
 727         if (!skb_make_writable(e->skb, data_len))
 728                 return -ENOMEM;
 729         skb_copy_to_linear_data(e->skb, data, data_len);
 730         e->skb->ip_summed = CHECKSUM_NONE;
 731         return 0;
 732 }
 733
 734 static int
 735 nfqnl_set_mode(struct nfqnl_instance *queue,
 736                unsigned char mode, unsigned int range)
 737 {
 738         int status = 0;
 739
 740         spin_lock_bh(&queue->lock);
 741         switch (mode) {
 742         case NFQNL_COPY_NONE:
 743         case NFQNL_COPY_META:
 744                 queue->copy_mode = mode;
 745                 queue->copy_range = 0;
 746                 break;
 747
 748         case NFQNL_COPY_PACKET:
 749                 queue->copy_mode = mode;
 750                 if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
 751                         queue->copy_range = NFQNL_MAX_COPY_RANGE;
 752                 else
 753                         queue->copy_range = range;
 754                 break;
 755
 756         default:
 757                 status = -EINVAL;
 758
 759         }
 760         spin_unlock_bh(&queue->lock);
 761
 762         return status;
 763 }
 764
 765 static int
 766 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
 767 {
 768         if (entry->state.in)
 769                 if (entry->state.in->ifindex == ifindex)
 770                         return 1;
 771         if (entry->state.out)
 772                 if (entry->state.out->ifindex == ifindex)
 773                         return 1;
 774 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 775         if (entry->skb->nf_bridge) {
 776                 int physinif, physoutif;
 777
 778                 physinif = nf_bridge_get_physinif(entry->skb);
 779                 physoutif = nf_bridge_get_physoutif(entry->skb);
 780
 781                 if (physinif == ifindex || physoutif == ifindex)
 782                         return 1;
 783         }
 784 #endif
 785         return 0;
 786 }
 787
 788 /* drop all packets with either indev or outdev == ifindex from all queue
 789  * instances */
 790 static void
 791 nfqnl_dev_drop(struct net *net, int ifindex)
 792 {
 793         int i;
 794         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 795
 796         rcu_read_lock();
 797
 798         for (i = 0; i < INSTANCE_BUCKETS; i++) {
 799                 struct nfqnl_instance *inst;
 800                 struct hlist_head *head = &q->instance_table[i];
 801
 802                 hlist_for_each_entry_rcu(inst, head, hlist)
 803                         nfqnl_flush(inst, dev_cmp, ifindex);
 804         }
 805
 806         rcu_read_unlock();
 807 }
 808
 809 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
 810
 811 static int
 812 nfqnl_rcv_dev_event(struct notifier_block *this,
 813                     unsigned long event, void *ptr)
 814 {
 815         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 816
 817         /* Drop any packets associated with the downed device */
 818         if (event == NETDEV_DOWN)
 819                 nfqnl_dev_drop(dev_net(dev), dev->ifindex);
 820         return NOTIFY_DONE;
 821 }
 822
 823 static struct notifier_block nfqnl_dev_notifier = {
 824         .notifier_call  = nfqnl_rcv_dev_event,
 825 };
 826
 827 static int
 828 nfqnl_rcv_nl_event(struct notifier_block *this,
 829                    unsigned long event, void *ptr)
 830 {
 831         struct netlink_notify *n = ptr;
 832         struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
 833
 834         if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
 835                 int i;
 836
 837                 /* destroy all instances for this portid */
 838                 spin_lock(&q->instances_lock);
 839                 for (i = 0; i < INSTANCE_BUCKETS; i++) {
 840                         struct hlist_node *t2;
 841                         struct nfqnl_instance *inst;
 842                         struct hlist_head *head = &q->instance_table[i];
 843
 844                         hlist_for_each_entry_safe(inst, t2, head, hlist) {
 845                                 if (n->portid == inst->peer_portid)
 846                                         __instance_destroy(inst);
 847                         }
 848                 }
 849                 spin_unlock(&q->instances_lock);
 850         }
 851         return NOTIFY_DONE;
 852 }
 853
 854 static struct notifier_block nfqnl_rtnl_notifier = {
 855         .notifier_call  = nfqnl_rcv_nl_event,
 856 };
 857
 858 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
 859         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 860         [NFQA_MARK]             = { .type = NLA_U32 },
 861         [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
 862         [NFQA_CT]               = { .type = NLA_UNSPEC },
 863         [NFQA_EXP]              = { .type = NLA_UNSPEC },
 864 };
 865
 866 static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
 867         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 868         [NFQA_MARK]             = { .type = NLA_U32 },
 869 };
 870
 871 static struct nfqnl_instance *
 872 verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, u32 nlportid)
 873 {
 874         struct nfqnl_instance *queue;
 875
 876         queue = instance_lookup(q, queue_num);
 877         if (!queue)
 878                 return ERR_PTR(-ENODEV);
 879
 880         if (queue->peer_portid != nlportid)
 881                 return ERR_PTR(-EPERM);
 882
 883         return queue;
 884 }
 885
 886 static struct nfqnl_msg_verdict_hdr*
 887 verdicthdr_get(const struct nlattr * const nfqa[])
 888 {
 889         struct nfqnl_msg_verdict_hdr *vhdr;
 890         unsigned int verdict;
 891
 892         if (!nfqa[NFQA_VERDICT_HDR])
 893                 return NULL;
 894
 895         vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
 896         verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
 897         if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
 898                 return NULL;
 899         return vhdr;
 900 }
 901
 902 static int nfq_id_after(unsigned int id, unsigned int max)
 903 {
 904         return (int)(id - max) > 0;
 905 }
 906
 907 static int
 908 nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
 909                    const struct nlmsghdr *nlh,
 910                    const struct nlattr * const nfqa[])
 911 {
 912         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 913         struct nf_queue_entry *entry, *tmp;
 914         unsigned int verdict, maxid;
 915         struct nfqnl_msg_verdict_hdr *vhdr;
 916         struct nfqnl_instance *queue;
 917         LIST_HEAD(batch_list);
 918         u16 queue_num = ntohs(nfmsg->res_id);
 919
 920         struct net *net = sock_net(ctnl);
 921         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 922
 923         queue = verdict_instance_lookup(q, queue_num,
 924                                         NETLINK_CB(skb).portid);
 925         if (IS_ERR(queue))
 926                 return PTR_ERR(queue);
 927
 928         vhdr = verdicthdr_get(nfqa);
 929         if (!vhdr)
 930                 return -EINVAL;
 931
 932         verdict = ntohl(vhdr->verdict);
 933         maxid = ntohl(vhdr->id);
 934
 935         spin_lock_bh(&queue->lock);
 936
 937         list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
 938                 if (nfq_id_after(entry->id, maxid))
 939                         break;
 940                 __dequeue_entry(queue, entry);
 941                 list_add_tail(&entry->list, &batch_list);
 942         }
 943
 944         spin_unlock_bh(&queue->lock);
 945
 946         if (list_empty(&batch_list))
 947                 return -ENOENT;
 948
 949         list_for_each_entry_safe(entry, tmp, &batch_list, list) {
 950                 if (nfqa[NFQA_MARK])
 951                         entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 952                 nf_reinject(entry, verdict);
 953         }
 954         return 0;
 955 }
 956
 957 static int
 958 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
 959                    const struct nlmsghdr *nlh,
 960                    const struct nlattr * const nfqa[])
 961 {
 962         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 963         u_int16_t queue_num = ntohs(nfmsg->res_id);
 964
 965         struct nfqnl_msg_verdict_hdr *vhdr;
 966         struct nfqnl_instance *queue;
 967         unsigned int verdict;
 968         struct nf_queue_entry *entry;
 969         enum ip_conntrack_info uninitialized_var(ctinfo);
 970         struct nf_conn *ct = NULL;
 971
 972         struct net *net = sock_net(ctnl);
 973         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 974
 975         queue = instance_lookup(q, queue_num);
 976         if (!queue)
 977                 queue = verdict_instance_lookup(q, queue_num,
 978                                                 NETLINK_CB(skb).portid);
 979         if (IS_ERR(queue))
 980                 return PTR_ERR(queue);
 981
 982         vhdr = verdicthdr_get(nfqa);
 983         if (!vhdr)
 984                 return -EINVAL;
 985
 986         verdict = ntohl(vhdr->verdict);
 987
 988         entry = find_dequeue_entry(queue, ntohl(vhdr->id));
 989         if (entry == NULL)
 990                 return -ENOENT;
 991
 992         if (nfqa[NFQA_CT]) {
 993                 ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
 994                 if (ct && nfqa[NFQA_EXP]) {
 995                         nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
 996                                             NETLINK_CB(skb).portid,
 997                                             nlmsg_report(nlh));
 998                 }
 999         }
1000
1001         if (nfqa[NFQA_PAYLOAD]) {
1002                 u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
1003                 int diff = payload_len - entry->skb->len;
1004
1005                 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1006                                  payload_len, entry, diff) < 0)
1007                         verdict = NF_DROP;
1008
1009                 if (ct)
1010                         nfqnl_ct_seq_adjust(entry->skb, ct, ctinfo, diff);
1011         }
1012
1013         if (nfqa[NFQA_MARK])
1014                 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1015
1016         nf_reinject(entry, verdict);
1017         return 0;
1018 }
1019
1020 static int
1021 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1022                   const struct nlmsghdr *nlh,
1023                   const struct nlattr * const nfqa[])
1024 {
1025         return -ENOTSUPP;
1026 }
1027
1028 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1029         [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1030         [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
1031 };
1032
1033 static const struct nf_queue_handler nfqh = {
1034         .outfn  = &nfqnl_enqueue_packet,
1035 };
1036
1037 static int
1038 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1039                   const struct nlmsghdr *nlh,
1040                   const struct nlattr * const nfqa[])
1041 {
1042         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1043         u_int16_t queue_num = ntohs(nfmsg->res_id);
1044         struct nfqnl_instance *queue;
1045         struct nfqnl_msg_config_cmd *cmd = NULL;
1046         struct net *net = sock_net(ctnl);
1047         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1048         int ret = 0;
1049
1050         if (nfqa[NFQA_CFG_CMD]) {
1051                 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1052
1053                 /* Obsolete commands without queue context */
1054                 switch (cmd->command) {
1055                 case NFQNL_CFG_CMD_PF_BIND: return 0;
1056                 case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1057                 }
1058         }
1059
1060         rcu_read_lock();
1061         queue = instance_lookup(q, queue_num);
1062         if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1063                 ret = -EPERM;
1064                 goto err_out_unlock;
1065         }
1066
1067         if (cmd != NULL) {
1068                 switch (cmd->command) {
1069                 case NFQNL_CFG_CMD_BIND:
1070                         if (queue) {
1071                                 ret = -EBUSY;
1072                                 goto err_out_unlock;
1073                         }
1074                         queue = instance_create(q, queue_num,
1075                                                 NETLINK_CB(skb).portid);
1076                         if (IS_ERR(queue)) {
1077                                 ret = PTR_ERR(queue);
1078                                 goto err_out_unlock;
1079                         }
1080                         break;
1081                 case NFQNL_CFG_CMD_UNBIND:
1082                         if (!queue) {
1083                                 ret = -ENODEV;
1084                                 goto err_out_unlock;
1085                         }
1086                         instance_destroy(q, queue);
1087                         break;
1088                 case NFQNL_CFG_CMD_PF_BIND:
1089                 case NFQNL_CFG_CMD_PF_UNBIND:
1090                         break;
1091                 default:
1092                         ret = -ENOTSUPP;
1093                         break;
1094                 }
1095         }
1096
1097         if (nfqa[NFQA_CFG_PARAMS]) {
1098                 struct nfqnl_msg_config_params *params;
1099
1100                 if (!queue) {
1101                         ret = -ENODEV;
1102                         goto err_out_unlock;
1103                 }
1104                 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1105                 nfqnl_set_mode(queue, params->copy_mode,
1106                                 ntohl(params->copy_range));
1107         }
1108
1109         if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1110                 __be32 *queue_maxlen;
1111
1112                 if (!queue) {
1113                         ret = -ENODEV;
1114                         goto err_out_unlock;
1115                 }
1116                 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1117                 spin_lock_bh(&queue->lock);
1118                 queue->queue_maxlen = ntohl(*queue_maxlen);
1119                 spin_unlock_bh(&queue->lock);
1120         }
1121
1122         if (nfqa[NFQA_CFG_FLAGS]) {
1123                 __u32 flags, mask;
1124
1125                 if (!queue) {
1126                         ret = -ENODEV;
1127                         goto err_out_unlock;
1128                 }
1129
1130                 if (!nfqa[NFQA_CFG_MASK]) {
1131                         /* A mask is needed to specify which flags are being
1132                          * changed.
1133                          */
1134                         ret = -EINVAL;
1135                         goto err_out_unlock;
1136                 }
1137
1138                 flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1139                 mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1140
1141                 if (flags >= NFQA_CFG_F_MAX) {
1142                         ret = -EOPNOTSUPP;
1143                         goto err_out_unlock;
1144                 }
1145
1146                 spin_lock_bh(&queue->lock);
1147                 queue->flags &= ~mask;
1148                 queue->flags |= flags & mask;
1149                 spin_unlock_bh(&queue->lock);
1150         }
1151
1152 err_out_unlock:
1153         rcu_read_unlock();
1154         return ret;
1155 }
1156
1157 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1158         [NFQNL_MSG_PACKET]      = { .call_rcu = nfqnl_recv_unsupp,
1159                                     .attr_count = NFQA_MAX, },
1160         [NFQNL_MSG_VERDICT]     = { .call_rcu = nfqnl_recv_verdict,
1161                                     .attr_count = NFQA_MAX,
1162                                     .policy = nfqa_verdict_policy },
1163         [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
1164                                     .attr_count = NFQA_CFG_MAX,
1165                                     .policy = nfqa_cfg_policy },
1166         [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1167                                     .attr_count = NFQA_MAX,
1168                                     .policy = nfqa_verdict_batch_policy },
1169 };
1170
1171 static const struct nfnetlink_subsystem nfqnl_subsys = {
1172         .name           = "nf_queue",
1173         .subsys_id      = NFNL_SUBSYS_QUEUE,
1174         .cb_count       = NFQNL_MSG_MAX,
1175         .cb             = nfqnl_cb,
1176 };
1177
1178 #ifdef CONFIG_PROC_FS
1179 struct iter_state {
1180         struct seq_net_private p;
1181         unsigned int bucket;
1182 };
1183
1184 static struct hlist_node *get_first(struct seq_file *seq)
1185 {
1186         struct iter_state *st = seq->private;
1187         struct net *net;
1188         struct nfnl_queue_net *q;
1189
1190         if (!st)
1191                 return NULL;
1192
1193         net = seq_file_net(seq);
1194         q = nfnl_queue_pernet(net);
1195         for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1196                 if (!hlist_empty(&q->instance_table[st->bucket]))
1197                         return q->instance_table[st->bucket].first;
1198         }
1199         return NULL;
1200 }
1201
1202 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1203 {
1204         struct iter_state *st = seq->private;
1205         struct net *net = seq_file_net(seq);
1206
1207         h = h->next;
1208         while (!h) {
1209                 struct nfnl_queue_net *q;
1210
1211                 if (++st->bucket >= INSTANCE_BUCKETS)
1212                         return NULL;
1213
1214                 q = nfnl_queue_pernet(net);
1215                 h = q->instance_table[st->bucket].first;
1216         }
1217         return h;
1218 }
1219
1220 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1221 {
1222         struct hlist_node *head;
1223         head = get_first(seq);
1224
1225         if (head)
1226                 while (pos && (head = get_next(seq, head)))
1227                         pos--;
1228         return pos ? NULL : head;
1229 }
1230
1231 static void *seq_start(struct seq_file *s, loff_t *pos)
1232         __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1233 {
1234         spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1235         return get_idx(s, *pos);
1236 }
1237
1238 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1239 {
1240         (*pos)++;
1241         return get_next(s, v);
1242 }
1243
1244 static void seq_stop(struct seq_file *s, void *v)
1245         __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1246 {
1247         spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1248 }
1249
1250 static int seq_show(struct seq_file *s, void *v)
1251 {
1252         const struct nfqnl_instance *inst = v;
1253
1254         seq_printf(s, "%5u %6u %5u %1u %5u %5u %5u %8u %2d\n",
1255                    inst->queue_num,
1256                    inst->peer_portid, inst->queue_total,
1257                    inst->copy_mode, inst->copy_range,
1258                    inst->queue_dropped, inst->queue_user_dropped,
1259                    inst->id_sequence, 1);
1260         return seq_has_overflowed(s);
1261 }
1262
1263 static const struct seq_operations nfqnl_seq_ops = {
1264         .start  = seq_start,
1265         .next   = seq_next,
1266         .stop   = seq_stop,
1267         .show   = seq_show,
1268 };
1269
1270 static int nfqnl_open(struct inode *inode, struct file *file)
1271 {
1272         return seq_open_net(inode, file, &nfqnl_seq_ops,
1273                         sizeof(struct iter_state));
1274 }
1275
1276 static const struct file_operations nfqnl_file_ops = {
1277         .owner   = THIS_MODULE,
1278         .open    = nfqnl_open,
1279         .read    = seq_read,
1280         .llseek  = seq_lseek,
1281         .release = seq_release_net,
1282 };
1283
1284 #endif /* PROC_FS */
1285
1286 static int __net_init nfnl_queue_net_init(struct net *net)
1287 {
1288         unsigned int i;
1289         struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1290
1291         for (i = 0; i < INSTANCE_BUCKETS; i++)
1292                 INIT_HLIST_HEAD(&q->instance_table[i]);
1293
1294         spin_lock_init(&q->instances_lock);
1295
1296 #ifdef CONFIG_PROC_FS
1297         if (!proc_create("nfnetlink_queue", 0440,
1298                          net->nf.proc_netfilter, &nfqnl_file_ops))
1299                 return -ENOMEM;
1300 #endif
1301         return 0;
1302 }
1303
1304 static void __net_exit nfnl_queue_net_exit(struct net *net)
1305 {
1306 #ifdef CONFIG_PROC_FS
1307         remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1308 #endif
1309 }
1310
1311 static struct pernet_operations nfnl_queue_net_ops = {
1312         .init   = nfnl_queue_net_init,
1313         .exit   = nfnl_queue_net_exit,
1314         .id     = &nfnl_queue_net_id,
1315         .size   = sizeof(struct nfnl_queue_net),
1316 };
1317
1318 static int __init nfnetlink_queue_init(void)
1319 {
1320         int status;
1321
1322         status = register_pernet_subsys(&nfnl_queue_net_ops);
1323         if (status < 0) {
1324                 pr_err("nf_queue: failed to register pernet ops\n");
1325                 goto out;
1326         }
1327
1328         netlink_register_notifier(&nfqnl_rtnl_notifier);
1329         status = nfnetlink_subsys_register(&nfqnl_subsys);
1330         if (status < 0) {
1331                 pr_err("nf_queue: failed to create netlink socket\n");
1332                 goto cleanup_netlink_notifier;
1333         }
1334
1335         register_netdevice_notifier(&nfqnl_dev_notifier);
1336         nf_register_queue_handler(&nfqh);
1337         return status;
1338
1339 cleanup_netlink_notifier:
1340         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1341 out:
1342         return status;
1343 }
1344
1345 static void __exit nfnetlink_queue_fini(void)
1346 {
1347         nf_unregister_queue_handler();
1348         unregister_netdevice_notifier(&nfqnl_dev_notifier);
1349         nfnetlink_subsys_unregister(&nfqnl_subsys);
1350         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1351         unregister_pernet_subsys(&nfnl_queue_net_ops);
1352
1353         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1354 }
1355
1356 MODULE_DESCRIPTION("netfilter packet queue handler");
1357 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1358 MODULE_LICENSE("GPL");
1359 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1360
1361 module_init(nfnetlink_queue_init);
1362 module_exit(nfnetlink_queue_fini);