SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/netfilter/nfnetlink_queue.c

   1 /*
   2  * This is a module which is used for queueing packets and communicating with
   3  * userspace via nfetlink.
   4  *
   5  * (C) 2005 by Harald Welte <laforge@netfilter.org>
   6  *
   7  * Based on the old ipv4-only ip_queue.c:
   8  * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
   9  * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  */
  16 #include <linux/module.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/init.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/notifier.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/netfilter.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/netfilter_ipv4.h>
  25 #include <linux/netfilter_ipv6.h>
  26 #include <linux/netfilter/nfnetlink.h>
  27 #include <linux/netfilter/nfnetlink_queue.h>
  28 #include <linux/list.h>
  29 #include <net/sock.h>
  30 #include <net/netfilter/nf_queue.h>
  31
  32 #include <asm/atomic.h>
  33
  34 #ifdef CONFIG_BRIDGE_NETFILTER
  35 #include "../bridge/br_private.h"
  36 #endif
  37
  38 #define NFQNL_QMAX_DEFAULT 1024
  39
  40 struct nfqnl_instance {
  41         struct hlist_node hlist;                /* global list of queues */
  42         struct rcu_head rcu;
  43
  44         int peer_pid;
  45         unsigned int queue_maxlen;
  46         unsigned int copy_range;
  47         unsigned int queue_total;
  48         unsigned int queue_dropped;
  49         unsigned int queue_user_dropped;
  50
  51         unsigned int id_sequence;               /* 'sequence' of pkt ids */
  52
  53         u_int16_t queue_num;                    /* number of this queue */
  54         u_int8_t copy_mode;
  55
  56         spinlock_t lock;
  57
  58         struct list_head queue_list;            /* packets in queue */
  59 };
  60
  61 typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
  62
  63 static DEFINE_SPINLOCK(instances_lock);
  64
  65 #define INSTANCE_BUCKETS        16
  66 static struct hlist_head instance_table[INSTANCE_BUCKETS] __read_mostly;
  67
  68 static inline u_int8_t instance_hashfn(u_int16_t queue_num)
  69 {
  70         return ((queue_num >> 8) | queue_num) % INSTANCE_BUCKETS;
  71 }
  72
  73 static struct nfqnl_instance *
  74 instance_lookup(u_int16_t queue_num)
  75 {
  76         struct hlist_head *head;
  77         struct hlist_node *pos;
  78         struct nfqnl_instance *inst;
  79
  80         head = &instance_table[instance_hashfn(queue_num)];
  81         hlist_for_each_entry_rcu(inst, pos, head, hlist) {
  82                 if (inst->queue_num == queue_num)
  83                         return inst;
  84         }
  85         return NULL;
  86 }
  87
  88 static struct nfqnl_instance *
  89 instance_create(u_int16_t queue_num, int pid)
  90 {
  91         struct nfqnl_instance *inst = NULL;
  92         unsigned int h;
  93
  94         spin_lock(&instances_lock);
  95         if (instance_lookup(queue_num))
  96                 goto out_unlock;
  97
  98         inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
  99         if (!inst)
 100                 goto out_unlock;
 101
 102         inst->queue_num = queue_num;
 103         inst->peer_pid = pid;
 104         inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
 105         inst->copy_range = 0xfffff;
 106         inst->copy_mode = NFQNL_COPY_NONE;
 107         spin_lock_init(&inst->lock);
 108         INIT_LIST_HEAD(&inst->queue_list);
 109         INIT_RCU_HEAD(&inst->rcu);
 110
 111         if (!try_module_get(THIS_MODULE))
 112                 goto out_free;
 113
 114         h = instance_hashfn(queue_num);
 115         hlist_add_head_rcu(&inst->hlist, &instance_table[h]);
 116
 117         spin_unlock(&instances_lock);
 118
 119         return inst;
 120
 121 out_free:
 122         kfree(inst);
 123 out_unlock:
 124         spin_unlock(&instances_lock);
 125         return NULL;
 126 }
 127
 128 static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
 129                         unsigned long data);
 130
 131 static void
 132 instance_destroy_rcu(struct rcu_head *head)
 133 {
 134         struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
 135                                                    rcu);
 136
 137         nfqnl_flush(inst, NULL, 0);
 138         kfree(inst);
 139         module_put(THIS_MODULE);
 140 }
 141
 142 static void
 143 __instance_destroy(struct nfqnl_instance *inst)
 144 {
 145         hlist_del_rcu(&inst->hlist);
 146         call_rcu(&inst->rcu, instance_destroy_rcu);
 147 }
 148
 149 static void
 150 instance_destroy(struct nfqnl_instance *inst)
 151 {
 152         spin_lock(&instances_lock);
 153         __instance_destroy(inst);
 154         spin_unlock(&instances_lock);
 155 }
 156
 157 static inline void
 158 __enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 159 {
 160        list_add_tail(&entry->list, &queue->queue_list);
 161        queue->queue_total++;
 162 }
 163
 164 static struct nf_queue_entry *
 165 find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
 166 {
 167         struct nf_queue_entry *entry = NULL, *i;
 168
 169         spin_lock_bh(&queue->lock);
 170
 171         list_for_each_entry(i, &queue->queue_list, list) {
 172                 if (i->id == id) {
 173                         entry = i;
 174                         break;
 175                 }
 176         }
 177
 178         if (entry) {
 179                 list_del(&entry->list);
 180                 queue->queue_total--;
 181         }
 182
 183         spin_unlock_bh(&queue->lock);
 184
 185         return entry;
 186 }
 187
 188 static void
 189 nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
 190 {
 191         struct nf_queue_entry *entry, *next;
 192
 193         spin_lock_bh(&queue->lock);
 194         list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
 195                 if (!cmpfn || cmpfn(entry, data)) {
 196                         list_del(&entry->list);
 197                         queue->queue_total--;
 198                         nf_reinject(entry, NF_DROP);
 199                 }
 200         }
 201         spin_unlock_bh(&queue->lock);
 202 }
 203
 204 static struct sk_buff *
 205 nfqnl_build_packet_message(struct nfqnl_instance *queue,
 206                            struct nf_queue_entry *entry)
 207 {
 208         sk_buff_data_t old_tail;
 209         size_t size;
 210         size_t data_len = 0;
 211         struct sk_buff *skb;
 212         struct nfqnl_msg_packet_hdr pmsg;
 213         struct nlmsghdr *nlh;
 214         struct nfgenmsg *nfmsg;
 215         struct sk_buff *entskb = entry->skb;
 216         struct net_device *indev;
 217         struct net_device *outdev;
 218
 219         size =    NLMSG_ALIGN(sizeof(struct nfgenmsg))
 220                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
 221                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 222                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 223 #ifdef CONFIG_BRIDGE_NETFILTER
 224                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 225                 + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 226 #endif
 227                 + nla_total_size(sizeof(u_int32_t))     /* mark */
 228                 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
 229                 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
 230
 231         outdev = entry->outdev;
 232
 233         spin_lock_bh(&queue->lock);
 234
 235         switch ((enum nfqnl_config_mode)queue->copy_mode) {
 236         case NFQNL_COPY_META:
 237         case NFQNL_COPY_NONE:
 238                 data_len = 0;
 239                 break;
 240
 241         case NFQNL_COPY_PACKET:
 242                 if ((entskb->ip_summed == CHECKSUM_PARTIAL ||
 243                      entskb->ip_summed == CHECKSUM_COMPLETE) &&
 244                     skb_checksum_help(entskb)) {
 245                         spin_unlock_bh(&queue->lock);
 246                         return NULL;
 247                 }
 248                 if (queue->copy_range == 0
 249                     || queue->copy_range > entskb->len)
 250                         data_len = entskb->len;
 251                 else
 252                         data_len = queue->copy_range;
 253
 254                 size += nla_total_size(data_len);
 255                 break;
 256         }
 257
 258         entry->id = queue->id_sequence++;
 259
 260         spin_unlock_bh(&queue->lock);
 261
 262         skb = alloc_skb(size, GFP_ATOMIC);
 263         if (!skb)
 264                 goto nlmsg_failure;
 265
 266         old_tail = skb->tail;
 267         nlh = NLMSG_PUT(skb, 0, 0,
 268                         NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
 269                         sizeof(struct nfgenmsg));
 270         nfmsg = NLMSG_DATA(nlh);
 271         nfmsg->nfgen_family = entry->pf;
 272         nfmsg->version = NFNETLINK_V0;
 273         nfmsg->res_id = htons(queue->queue_num);
 274
 275         pmsg.packet_id          = htonl(entry->id);
 276         pmsg.hw_protocol        = entskb->protocol;
 277         pmsg.hook               = entry->hook;
 278
 279         NLA_PUT(skb, NFQA_PACKET_HDR, sizeof(pmsg), &pmsg);
 280
 281         indev = entry->indev;
 282         if (indev) {
 283 #ifndef CONFIG_BRIDGE_NETFILTER
 284                 NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex));
 285 #else
 286                 if (entry->pf == PF_BRIDGE) {
 287                         /* Case 1: indev is physical input device, we need to
 288                          * look for bridge group (when called from
 289                          * netfilter_bridge) */
 290                         NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
 291                                      htonl(indev->ifindex));
 292                         /* this is the bridge group "brX" */
 293                         NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
 294                                      htonl(indev->br_port->br->dev->ifindex));
 295                 } else {
 296                         /* Case 2: indev is bridge group, we need to look for
 297                          * physical device (when called from ipv4) */
 298                         NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
 299                                      htonl(indev->ifindex));
 300                         if (entskb->nf_bridge && entskb->nf_bridge->physindev)
 301                                 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSINDEV,
 302                                              htonl(entskb->nf_bridge->physindev->ifindex));
 303                 }
 304 #endif
 305         }
 306
 307         if (outdev) {
 308 #ifndef CONFIG_BRIDGE_NETFILTER
 309                 NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex));
 310 #else
 311                 if (entry->pf == PF_BRIDGE) {
 312                         /* Case 1: outdev is physical output device, we need to
 313                          * look for bridge group (when called from
 314                          * netfilter_bridge) */
 315                         NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 316                                      htonl(outdev->ifindex));
 317                         /* this is the bridge group "brX" */
 318                         NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
 319                                      htonl(outdev->br_port->br->dev->ifindex));
 320                 } else {
 321                         /* Case 2: outdev is bridge group, we need to look for
 322                          * physical output device (when called from ipv4) */
 323                         NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
 324                                      htonl(outdev->ifindex));
 325                         if (entskb->nf_bridge && entskb->nf_bridge->physoutdev)
 326                                 NLA_PUT_BE32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 327                                              htonl(entskb->nf_bridge->physoutdev->ifindex));
 328                 }
 329 #endif
 330         }
 331
 332         if (entskb->mark)
 333                 NLA_PUT_BE32(skb, NFQA_MARK, htonl(entskb->mark));
 334
 335         if (indev && entskb->dev) {
 336                 struct nfqnl_msg_packet_hw phw;
 337                 int len = dev_parse_header(entskb, phw.hw_addr);
 338                 if (len) {
 339                         phw.hw_addrlen = htons(len);
 340                         NLA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
 341                 }
 342         }
 343
 344         if (entskb->tstamp.tv64) {
 345                 struct nfqnl_msg_packet_timestamp ts;
 346                 struct timeval tv = ktime_to_timeval(entskb->tstamp);
 347                 ts.sec = cpu_to_be64(tv.tv_sec);
 348                 ts.usec = cpu_to_be64(tv.tv_usec);
 349
 350                 NLA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
 351         }
 352
 353         if (data_len) {
 354                 struct nlattr *nla;
 355                 int size = nla_attr_size(data_len);
 356
 357                 if (skb_tailroom(skb) < nla_total_size(data_len)) {
 358                         printk(KERN_WARNING "nf_queue: no tailroom!\n");
 359                         goto nlmsg_failure;
 360                 }
 361
 362                 nla = (struct nlattr *)skb_put(skb, nla_total_size(data_len));
 363                 nla->nla_type = NFQA_PAYLOAD;
 364                 nla->nla_len = size;
 365
 366                 if (skb_copy_bits(entskb, 0, nla_data(nla), data_len))
 367                         BUG();
 368         }
 369
 370         nlh->nlmsg_len = skb->tail - old_tail;
 371         return skb;
 372
 373 nlmsg_failure:
 374 nla_put_failure:
 375         if (skb)
 376                 kfree_skb(skb);
 377         if (net_ratelimit())
 378                 printk(KERN_ERR "nf_queue: error creating packet message\n");
 379         return NULL;
 380 }
 381
 382 static int
 383 nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 384 {
 385         struct sk_buff *nskb;
 386         struct nfqnl_instance *queue;
 387         int err;
 388
 389         /* rcu_read_lock()ed by nf_hook_slow() */
 390         queue = instance_lookup(queuenum);
 391         if (!queue)
 392                 goto err_out;
 393
 394         if (queue->copy_mode == NFQNL_COPY_NONE)
 395                 goto err_out;
 396
 397         nskb = nfqnl_build_packet_message(queue, entry);
 398         if (nskb == NULL)
 399                 goto err_out;
 400
 401         spin_lock_bh(&queue->lock);
 402
 403         if (!queue->peer_pid)
 404                 goto err_out_free_nskb;
 405
 406         if (queue->queue_total >= queue->queue_maxlen) {
 407                 queue->queue_dropped++;
 408                 if (net_ratelimit())
 409                           printk(KERN_WARNING "nf_queue: full at %d entries, "
 410                                  "dropping packets(s). Dropped: %d\n",
 411                                  queue->queue_total, queue->queue_dropped);
 412                 goto err_out_free_nskb;
 413         }
 414
 415         /* nfnetlink_unicast will either free the nskb or add it to a socket */
 416         err = nfnetlink_unicast(nskb, queue->peer_pid, MSG_DONTWAIT);
 417         if (err < 0) {
 418                 queue->queue_user_dropped++;
 419                 goto err_out_unlock;
 420         }
 421
 422         __enqueue_entry(queue, entry);
 423
 424         spin_unlock_bh(&queue->lock);
 425         return 0;
 426
 427 err_out_free_nskb:
 428         kfree_skb(nskb);
 429 err_out_unlock:
 430         spin_unlock_bh(&queue->lock);
 431 err_out:
 432         return -1;
 433 }
 434
 435 static int
 436 nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e)
 437 {
 438         int diff;
 439         int err;
 440
 441         diff = data_len - e->skb->len;
 442         if (diff < 0) {
 443                 if (pskb_trim(e->skb, data_len))
 444                         return -ENOMEM;
 445         } else if (diff > 0) {
 446                 if (data_len > 0xFFFF)
 447                         return -EINVAL;
 448                 if (diff > skb_tailroom(e->skb)) {
 449                         err = pskb_expand_head(e->skb, 0,
 450                                                diff - skb_tailroom(e->skb),
 451                                                GFP_ATOMIC);
 452                         if (err) {
 453                                 printk(KERN_WARNING "nf_queue: OOM "
 454                                       "in mangle, dropping packet\n");
 455                                 return err;
 456                         }
 457                 }
 458                 skb_put(e->skb, diff);
 459         }
 460         if (!skb_make_writable(e->skb, data_len))
 461                 return -ENOMEM;
 462         skb_copy_to_linear_data(e->skb, data, data_len);
 463         e->skb->ip_summed = CHECKSUM_NONE;
 464         return 0;
 465 }
 466
 467 static int
 468 nfqnl_set_mode(struct nfqnl_instance *queue,
 469                unsigned char mode, unsigned int range)
 470 {
 471         int status = 0;
 472
 473         spin_lock_bh(&queue->lock);
 474         switch (mode) {
 475         case NFQNL_COPY_NONE:
 476         case NFQNL_COPY_META:
 477                 queue->copy_mode = mode;
 478                 queue->copy_range = 0;
 479                 break;
 480
 481         case NFQNL_COPY_PACKET:
 482                 queue->copy_mode = mode;
 483                 /* we're using struct nlattr which has 16bit nla_len */
 484                 if (range > 0xffff)
 485                         queue->copy_range = 0xffff;
 486                 else
 487                         queue->copy_range = range;
 488                 break;
 489
 490         default:
 491                 status = -EINVAL;
 492
 493         }
 494         spin_unlock_bh(&queue->lock);
 495
 496         return status;
 497 }
 498
 499 static int
 500 dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
 501 {
 502         if (entry->indev)
 503                 if (entry->indev->ifindex == ifindex)
 504                         return 1;
 505         if (entry->outdev)
 506                 if (entry->outdev->ifindex == ifindex)
 507                         return 1;
 508 #ifdef CONFIG_BRIDGE_NETFILTER
 509         if (entry->skb->nf_bridge) {
 510                 if (entry->skb->nf_bridge->physindev &&
 511                     entry->skb->nf_bridge->physindev->ifindex == ifindex)
 512                         return 1;
 513                 if (entry->skb->nf_bridge->physoutdev &&
 514                     entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
 515                         return 1;
 516         }
 517 #endif
 518         return 0;
 519 }
 520
 521 /* drop all packets with either indev or outdev == ifindex from all queue
 522  * instances */
 523 static void
 524 nfqnl_dev_drop(int ifindex)
 525 {
 526         int i;
 527
 528         rcu_read_lock();
 529
 530         for (i = 0; i < INSTANCE_BUCKETS; i++) {
 531                 struct hlist_node *tmp;
 532                 struct nfqnl_instance *inst;
 533                 struct hlist_head *head = &instance_table[i];
 534
 535                 hlist_for_each_entry_rcu(inst, tmp, head, hlist)
 536                         nfqnl_flush(inst, dev_cmp, ifindex);
 537         }
 538
 539         rcu_read_unlock();
 540 }
 541
 542 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
 543
 544 static int
 545 nfqnl_rcv_dev_event(struct notifier_block *this,
 546                     unsigned long event, void *ptr)
 547 {
 548         struct net_device *dev = ptr;
 549
 550         if (dev->nd_net != &init_net)
 551                 return NOTIFY_DONE;
 552
 553         /* Drop any packets associated with the downed device */
 554         if (event == NETDEV_DOWN)
 555                 nfqnl_dev_drop(dev->ifindex);
 556         return NOTIFY_DONE;
 557 }
 558
 559 static struct notifier_block nfqnl_dev_notifier = {
 560         .notifier_call  = nfqnl_rcv_dev_event,
 561 };
 562
 563 static int
 564 nfqnl_rcv_nl_event(struct notifier_block *this,
 565                    unsigned long event, void *ptr)
 566 {
 567         struct netlink_notify *n = ptr;
 568
 569         if (event == NETLINK_URELEASE &&
 570             n->protocol == NETLINK_NETFILTER && n->pid) {
 571                 int i;
 572
 573                 /* destroy all instances for this pid */
 574                 spin_lock(&instances_lock);
 575                 for (i = 0; i < INSTANCE_BUCKETS; i++) {
 576                         struct hlist_node *tmp, *t2;
 577                         struct nfqnl_instance *inst;
 578                         struct hlist_head *head = &instance_table[i];
 579
 580                         hlist_for_each_entry_safe(inst, tmp, t2, head, hlist) {
 581                                 if ((n->net == &init_net) &&
 582                                     (n->pid == inst->peer_pid))
 583                                         __instance_destroy(inst);
 584                         }
 585                 }
 586                 spin_unlock(&instances_lock);
 587         }
 588         return NOTIFY_DONE;
 589 }
 590
 591 static struct notifier_block nfqnl_rtnl_notifier = {
 592         .notifier_call  = nfqnl_rcv_nl_event,
 593 };
 594
 595 static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
 596         [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 597         [NFQA_MARK]             = { .type = NLA_U32 },
 598         [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
 599 };
 600
 601 static int
 602 nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
 603                    struct nlmsghdr *nlh, struct nlattr *nfqa[])
 604 {
 605         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 606         u_int16_t queue_num = ntohs(nfmsg->res_id);
 607
 608         struct nfqnl_msg_verdict_hdr *vhdr;
 609         struct nfqnl_instance *queue;
 610         unsigned int verdict;
 611         struct nf_queue_entry *entry;
 612         int err;
 613
 614         rcu_read_lock();
 615         queue = instance_lookup(queue_num);
 616         if (!queue) {
 617                 err = -ENODEV;
 618                 goto err_out_unlock;
 619         }
 620
 621         if (queue->peer_pid != NETLINK_CB(skb).pid) {
 622                 err = -EPERM;
 623                 goto err_out_unlock;
 624         }
 625
 626         if (!nfqa[NFQA_VERDICT_HDR]) {
 627                 err = -EINVAL;
 628                 goto err_out_unlock;
 629         }
 630
 631         vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
 632         verdict = ntohl(vhdr->verdict);
 633
 634         if ((verdict & NF_VERDICT_MASK) > NF_MAX_VERDICT) {
 635                 err = -EINVAL;
 636                 goto err_out_unlock;
 637         }
 638
 639         entry = find_dequeue_entry(queue, ntohl(vhdr->id));
 640         if (entry == NULL) {
 641                 err = -ENOENT;
 642                 goto err_out_unlock;
 643         }
 644         rcu_read_unlock();
 645
 646         if (nfqa[NFQA_PAYLOAD]) {
 647                 if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
 648                                  nla_len(nfqa[NFQA_PAYLOAD]), entry) < 0)
 649                         verdict = NF_DROP;
 650         }
 651
 652         if (nfqa[NFQA_MARK])
 653                 entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 654
 655         nf_reinject(entry, verdict);
 656         return 0;
 657
 658 err_out_unlock:
 659         rcu_read_unlock();
 660         return err;
 661 }
 662
 663 static int
 664 nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
 665                   struct nlmsghdr *nlh, struct nlattr *nfqa[])
 666 {
 667         return -ENOTSUPP;
 668 }
 669
 670 static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
 671         [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
 672         [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
 673 };
 674
 675 static const struct nf_queue_handler nfqh = {
 676         .name   = "nf_queue",
 677         .outfn  = &nfqnl_enqueue_packet,
 678 };
 679
 680 static int
 681 nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
 682                   struct nlmsghdr *nlh, struct nlattr *nfqa[])
 683 {
 684         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 685         u_int16_t queue_num = ntohs(nfmsg->res_id);
 686         struct nfqnl_instance *queue;
 687         struct nfqnl_msg_config_cmd *cmd = NULL;
 688         int ret = 0;
 689
 690         if (nfqa[NFQA_CFG_CMD]) {
 691                 cmd = nla_data(nfqa[NFQA_CFG_CMD]);
 692
 693                 /* Commands without queue context - might sleep */
 694                 switch (cmd->command) {
 695                 case NFQNL_CFG_CMD_PF_BIND:
 696                         ret = nf_register_queue_handler(ntohs(cmd->pf),
 697                                                         &nfqh);
 698                         break;
 699                 case NFQNL_CFG_CMD_PF_UNBIND:
 700                         ret = nf_unregister_queue_handler(ntohs(cmd->pf),
 701                                                           &nfqh);
 702                         break;
 703                 default:
 704                         break;
 705                 }
 706
 707                 if (ret < 0)
 708                         return ret;
 709         }
 710
 711         rcu_read_lock();
 712         queue = instance_lookup(queue_num);
 713         if (queue && queue->peer_pid != NETLINK_CB(skb).pid) {
 714                 ret = -EPERM;
 715                 goto err_out_unlock;
 716         }
 717
 718         if (cmd != NULL) {
 719                 switch (cmd->command) {
 720                 case NFQNL_CFG_CMD_BIND:
 721                         if (queue) {
 722                                 ret = -EBUSY;
 723                                 goto err_out_unlock;
 724                         }
 725                         queue = instance_create(queue_num, NETLINK_CB(skb).pid);
 726                         if (!queue) {
 727                                 ret = -EINVAL;
 728                                 goto err_out_unlock;
 729                         }
 730                         break;
 731                 case NFQNL_CFG_CMD_UNBIND:
 732                         if (!queue) {
 733                                 ret = -ENODEV;
 734                                 goto err_out_unlock;
 735                         }
 736                         instance_destroy(queue);
 737                         break;
 738                 case NFQNL_CFG_CMD_PF_BIND:
 739                 case NFQNL_CFG_CMD_PF_UNBIND:
 740                         break;
 741                 default:
 742                         ret = -EINVAL;
 743                         break;
 744                 }
 745         }
 746
 747         if (nfqa[NFQA_CFG_PARAMS]) {
 748                 struct nfqnl_msg_config_params *params;
 749
 750                 if (!queue) {
 751                         ret = -ENODEV;
 752                         goto err_out_unlock;
 753                 }
 754                 params = nla_data(nfqa[NFQA_CFG_PARAMS]);
 755                 nfqnl_set_mode(queue, params->copy_mode,
 756                                 ntohl(params->copy_range));
 757         }
 758
 759         if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
 760                 __be32 *queue_maxlen;
 761
 762                 if (!queue) {
 763                         ret = -ENODEV;
 764                         goto err_out_unlock;
 765                 }
 766                 queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
 767                 spin_lock_bh(&queue->lock);
 768                 queue->queue_maxlen = ntohl(*queue_maxlen);
 769                 spin_unlock_bh(&queue->lock);
 770         }
 771
 772 err_out_unlock:
 773         rcu_read_unlock();
 774         return ret;
 775 }
 776
 777 static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
 778         [NFQNL_MSG_PACKET]      = { .call = nfqnl_recv_unsupp,
 779                                     .attr_count = NFQA_MAX, },
 780         [NFQNL_MSG_VERDICT]     = { .call = nfqnl_recv_verdict,
 781                                     .attr_count = NFQA_MAX,
 782                                     .policy = nfqa_verdict_policy },
 783         [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
 784                                     .attr_count = NFQA_CFG_MAX,
 785                                     .policy = nfqa_cfg_policy },
 786 };
 787
 788 static const struct nfnetlink_subsystem nfqnl_subsys = {
 789         .name           = "nf_queue",
 790         .subsys_id      = NFNL_SUBSYS_QUEUE,
 791         .cb_count       = NFQNL_MSG_MAX,
 792         .cb             = nfqnl_cb,
 793 };
 794
 795 #ifdef CONFIG_PROC_FS
 796 struct iter_state {
 797         unsigned int bucket;
 798 };
 799
 800 static struct hlist_node *get_first(struct seq_file *seq)
 801 {
 802         struct iter_state *st = seq->private;
 803
 804         if (!st)
 805                 return NULL;
 806
 807         for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
 808                 if (!hlist_empty(&instance_table[st->bucket]))
 809                         return instance_table[st->bucket].first;
 810         }
 811         return NULL;
 812 }
 813
 814 static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
 815 {
 816         struct iter_state *st = seq->private;
 817
 818         h = h->next;
 819         while (!h) {
 820                 if (++st->bucket >= INSTANCE_BUCKETS)
 821                         return NULL;
 822
 823                 h = instance_table[st->bucket].first;
 824         }
 825         return h;
 826 }
 827
 828 static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
 829 {
 830         struct hlist_node *head;
 831         head = get_first(seq);
 832
 833         if (head)
 834                 while (pos && (head = get_next(seq, head)))
 835                         pos--;
 836         return pos ? NULL : head;
 837 }
 838
 839 static void *seq_start(struct seq_file *seq, loff_t *pos)
 840 {
 841         spin_lock(&instances_lock);
 842         return get_idx(seq, *pos);
 843 }
 844
 845 static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
 846 {
 847         (*pos)++;
 848         return get_next(s, v);
 849 }
 850
 851 static void seq_stop(struct seq_file *s, void *v)
 852 {
 853         spin_unlock(&instances_lock);
 854 }
 855
 856 static int seq_show(struct seq_file *s, void *v)
 857 {
 858         const struct nfqnl_instance *inst = v;
 859
 860         return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
 861                           inst->queue_num,
 862                           inst->peer_pid, inst->queue_total,
 863                           inst->copy_mode, inst->copy_range,
 864                           inst->queue_dropped, inst->queue_user_dropped,
 865                           inst->id_sequence, 1);
 866 }
 867
 868 static const struct seq_operations nfqnl_seq_ops = {
 869         .start  = seq_start,
 870         .next   = seq_next,
 871         .stop   = seq_stop,
 872         .show   = seq_show,
 873 };
 874
 875 static int nfqnl_open(struct inode *inode, struct file *file)
 876 {
 877         return seq_open_private(file, &nfqnl_seq_ops,
 878                         sizeof(struct iter_state));
 879 }
 880
 881 static const struct file_operations nfqnl_file_ops = {
 882         .owner   = THIS_MODULE,
 883         .open    = nfqnl_open,
 884         .read    = seq_read,
 885         .llseek  = seq_lseek,
 886         .release = seq_release_private,
 887 };
 888
 889 #endif /* PROC_FS */
 890
 891 static int __init nfnetlink_queue_init(void)
 892 {
 893         int i, status = -ENOMEM;
 894 #ifdef CONFIG_PROC_FS
 895         struct proc_dir_entry *proc_nfqueue;
 896 #endif
 897
 898         for (i = 0; i < INSTANCE_BUCKETS; i++)
 899                 INIT_HLIST_HEAD(&instance_table[i]);
 900
 901         netlink_register_notifier(&nfqnl_rtnl_notifier);
 902         status = nfnetlink_subsys_register(&nfqnl_subsys);
 903         if (status < 0) {
 904                 printk(KERN_ERR "nf_queue: failed to create netlink socket\n");
 905                 goto cleanup_netlink_notifier;
 906         }
 907
 908 #ifdef CONFIG_PROC_FS
 909         proc_nfqueue = create_proc_entry("nfnetlink_queue", 0440,
 910                                          proc_net_netfilter);
 911         if (!proc_nfqueue)
 912                 goto cleanup_subsys;
 913         proc_nfqueue->proc_fops = &nfqnl_file_ops;
 914 #endif
 915
 916         register_netdevice_notifier(&nfqnl_dev_notifier);
 917         return status;
 918
 919 #ifdef CONFIG_PROC_FS
 920 cleanup_subsys:
 921         nfnetlink_subsys_unregister(&nfqnl_subsys);
 922 #endif
 923 cleanup_netlink_notifier:
 924         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
 925         return status;
 926 }
 927
 928 static void __exit nfnetlink_queue_fini(void)
 929 {
 930         nf_unregister_queue_handlers(&nfqh);
 931         unregister_netdevice_notifier(&nfqnl_dev_notifier);
 932 #ifdef CONFIG_PROC_FS
 933         remove_proc_entry("nfnetlink_queue", proc_net_netfilter);
 934 #endif
 935         nfnetlink_subsys_unregister(&nfqnl_subsys);
 936         netlink_unregister_notifier(&nfqnl_rtnl_notifier);
 937 }
 938
 939 MODULE_DESCRIPTION("netfilter packet queue handler");
 940 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
 941 MODULE_LICENSE("GPL");
 942 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
 943
 944 module_init(nfnetlink_queue_init);
 945 module_exit(nfnetlink_queue_fini);