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