linux/net/netfilter/nfnetlink_queue_core.c
<<
>>
Prefs
   1/*
   2 * This is a module which is used for queueing packets and communicating with
   3 * userspace via nfnetlink.
   4 *
   5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
   6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
   7 *
   8 * Based on the old ipv4-only ip_queue.c:
   9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
  10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License version 2 as
  14 * published by the Free Software Foundation.
  15 *
  16 */
  17#include <linux/module.h>
  18#include <linux/skbuff.h>
  19#include <linux/init.h>
  20#include <linux/spinlock.h>
  21#include <linux/slab.h>
  22#include <linux/notifier.h>
  23#include <linux/netdevice.h>
  24#include <linux/netfilter.h>
  25#include <linux/proc_fs.h>
  26#include <linux/netfilter_ipv4.h>
  27#include <linux/netfilter_ipv6.h>
  28#include <linux/netfilter/nfnetlink.h>
  29#include <linux/netfilter/nfnetlink_queue.h>
  30#include <linux/list.h>
  31#include <net/sock.h>
  32#include <net/netfilter/nf_queue.h>
  33#include <net/netns/generic.h>
  34#include <net/netfilter/nfnetlink_queue.h>
  35
  36#include <linux/atomic.h>
  37
  38#ifdef CONFIG_BRIDGE_NETFILTER
  39#include "../bridge/br_private.h"
  40#endif
  41
  42#define NFQNL_QMAX_DEFAULT 1024
  43
  44/* We're using struct nlattr which has 16bit nla_len. Note that nla_len
  45 * includes the header length. Thus, the maximum packet length that we
  46 * support is 65531 bytes. We send truncated packets if the specified length
  47 * is larger than that.  Userspace can check for presence of NFQA_CAP_LEN
  48 * attribute to detect truncation.
  49 */
  50#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN)
  51
  52struct nfqnl_instance {
  53        struct hlist_node hlist;                /* global list of queues */
  54        struct rcu_head rcu;
  55
  56        int peer_portid;
  57        unsigned int queue_maxlen;
  58        unsigned int copy_range;
  59        unsigned int queue_dropped;
  60        unsigned int queue_user_dropped;
  61
  62
  63        u_int16_t queue_num;                    /* number of this queue */
  64        u_int8_t copy_mode;
  65        u_int32_t flags;                        /* Set using NFQA_CFG_FLAGS */
  66/*
  67 * Following fields are dirtied for each queued packet,
  68 * keep them in same cache line if possible.
  69 */
  70        spinlock_t      lock;
  71        unsigned int    queue_total;
  72        unsigned int    id_sequence;            /* 'sequence' of pkt ids */
  73        struct list_head queue_list;            /* packets in queue */
  74};
  75
  76typedef int (*nfqnl_cmpfn)(struct nf_queue_entry *, unsigned long);
  77
  78static int nfnl_queue_net_id __read_mostly;
  79
  80#define INSTANCE_BUCKETS        16
  81struct nfnl_queue_net {
  82        spinlock_t instances_lock;
  83        struct hlist_head instance_table[INSTANCE_BUCKETS];
  84};
  85
  86static struct nfnl_queue_net *nfnl_queue_pernet(struct net *net)
  87{
  88        return net_generic(net, nfnl_queue_net_id);
  89}
  90
  91static inline u_int8_t instance_hashfn(u_int16_t queue_num)
  92{
  93        return ((queue_num >> 8) ^ queue_num) % INSTANCE_BUCKETS;
  94}
  95
  96static struct nfqnl_instance *
  97instance_lookup(struct nfnl_queue_net *q, u_int16_t queue_num)
  98{
  99        struct hlist_head *head;
 100        struct nfqnl_instance *inst;
 101
 102        head = &q->instance_table[instance_hashfn(queue_num)];
 103        hlist_for_each_entry_rcu(inst, head, hlist) {
 104                if (inst->queue_num == queue_num)
 105                        return inst;
 106        }
 107        return NULL;
 108}
 109
 110static struct nfqnl_instance *
 111instance_create(struct nfnl_queue_net *q, u_int16_t queue_num,
 112                int portid)
 113{
 114        struct nfqnl_instance *inst;
 115        unsigned int h;
 116        int err;
 117
 118        spin_lock(&q->instances_lock);
 119        if (instance_lookup(q, queue_num)) {
 120                err = -EEXIST;
 121                goto out_unlock;
 122        }
 123
 124        inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
 125        if (!inst) {
 126                err = -ENOMEM;
 127                goto out_unlock;
 128        }
 129
 130        inst->queue_num = queue_num;
 131        inst->peer_portid = portid;
 132        inst->queue_maxlen = NFQNL_QMAX_DEFAULT;
 133        inst->copy_range = NFQNL_MAX_COPY_RANGE;
 134        inst->copy_mode = NFQNL_COPY_NONE;
 135        spin_lock_init(&inst->lock);
 136        INIT_LIST_HEAD(&inst->queue_list);
 137
 138        if (!try_module_get(THIS_MODULE)) {
 139                err = -EAGAIN;
 140                goto out_free;
 141        }
 142
 143        h = instance_hashfn(queue_num);
 144        hlist_add_head_rcu(&inst->hlist, &q->instance_table[h]);
 145
 146        spin_unlock(&q->instances_lock);
 147
 148        return inst;
 149
 150out_free:
 151        kfree(inst);
 152out_unlock:
 153        spin_unlock(&q->instances_lock);
 154        return ERR_PTR(err);
 155}
 156
 157static void nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn,
 158                        unsigned long data);
 159
 160static void
 161instance_destroy_rcu(struct rcu_head *head)
 162{
 163        struct nfqnl_instance *inst = container_of(head, struct nfqnl_instance,
 164                                                   rcu);
 165
 166        nfqnl_flush(inst, NULL, 0);
 167        kfree(inst);
 168        module_put(THIS_MODULE);
 169}
 170
 171static void
 172__instance_destroy(struct nfqnl_instance *inst)
 173{
 174        hlist_del_rcu(&inst->hlist);
 175        call_rcu(&inst->rcu, instance_destroy_rcu);
 176}
 177
 178static void
 179instance_destroy(struct nfnl_queue_net *q, struct nfqnl_instance *inst)
 180{
 181        spin_lock(&q->instances_lock);
 182        __instance_destroy(inst);
 183        spin_unlock(&q->instances_lock);
 184}
 185
 186static inline void
 187__enqueue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 188{
 189       list_add_tail(&entry->list, &queue->queue_list);
 190       queue->queue_total++;
 191}
 192
 193static void
 194__dequeue_entry(struct nfqnl_instance *queue, struct nf_queue_entry *entry)
 195{
 196        list_del(&entry->list);
 197        queue->queue_total--;
 198}
 199
 200static struct nf_queue_entry *
 201find_dequeue_entry(struct nfqnl_instance *queue, unsigned int id)
 202{
 203        struct nf_queue_entry *entry = NULL, *i;
 204
 205        spin_lock_bh(&queue->lock);
 206
 207        list_for_each_entry(i, &queue->queue_list, list) {
 208                if (i->id == id) {
 209                        entry = i;
 210                        break;
 211                }
 212        }
 213
 214        if (entry)
 215                __dequeue_entry(queue, entry);
 216
 217        spin_unlock_bh(&queue->lock);
 218
 219        return entry;
 220}
 221
 222static void
 223nfqnl_flush(struct nfqnl_instance *queue, nfqnl_cmpfn cmpfn, unsigned long data)
 224{
 225        struct nf_queue_entry *entry, *next;
 226
 227        spin_lock_bh(&queue->lock);
 228        list_for_each_entry_safe(entry, next, &queue->queue_list, list) {
 229                if (!cmpfn || cmpfn(entry, data)) {
 230                        list_del(&entry->list);
 231                        queue->queue_total--;
 232                        nf_reinject(entry, NF_DROP);
 233                }
 234        }
 235        spin_unlock_bh(&queue->lock);
 236}
 237
 238static void
 239nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen)
 240{
 241        int i, j = 0;
 242        int plen = 0; /* length of skb->head fragment */
 243        struct page *page;
 244        unsigned int offset;
 245
 246        /* dont bother with small payloads */
 247        if (len <= skb_tailroom(to)) {
 248                skb_copy_bits(from, 0, skb_put(to, len), len);
 249                return;
 250        }
 251
 252        if (hlen) {
 253                skb_copy_bits(from, 0, skb_put(to, hlen), hlen);
 254                len -= hlen;
 255        } else {
 256                plen = min_t(int, skb_headlen(from), len);
 257                if (plen) {
 258                        page = virt_to_head_page(from->head);
 259                        offset = from->data - (unsigned char *)page_address(page);
 260                        __skb_fill_page_desc(to, 0, page, offset, plen);
 261                        get_page(page);
 262                        j = 1;
 263                        len -= plen;
 264                }
 265        }
 266
 267        to->truesize += len + plen;
 268        to->len += len + plen;
 269        to->data_len += len + plen;
 270
 271        for (i = 0; i < skb_shinfo(from)->nr_frags; i++) {
 272                if (!len)
 273                        break;
 274                skb_shinfo(to)->frags[j] = skb_shinfo(from)->frags[i];
 275                skb_shinfo(to)->frags[j].size = min_t(int, skb_shinfo(to)->frags[j].size, len);
 276                len -= skb_shinfo(to)->frags[j].size;
 277                skb_frag_ref(to, j);
 278                j++;
 279        }
 280        skb_shinfo(to)->nr_frags = j;
 281}
 282
 283static int
 284nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet,
 285                      bool csum_verify)
 286{
 287        __u32 flags = 0;
 288
 289        if (packet->ip_summed == CHECKSUM_PARTIAL)
 290                flags = NFQA_SKB_CSUMNOTREADY;
 291        else if (csum_verify)
 292                flags = NFQA_SKB_CSUM_NOTVERIFIED;
 293
 294        if (skb_is_gso(packet))
 295                flags |= NFQA_SKB_GSO;
 296
 297        return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0;
 298}
 299
 300static struct sk_buff *
 301nfqnl_build_packet_message(struct nfqnl_instance *queue,
 302                           struct nf_queue_entry *entry,
 303                           __be32 **packet_id_ptr)
 304{
 305        size_t size;
 306        size_t data_len = 0, cap_len = 0;
 307        int hlen = 0;
 308        struct sk_buff *skb;
 309        struct nlattr *nla;
 310        struct nfqnl_msg_packet_hdr *pmsg;
 311        struct nlmsghdr *nlh;
 312        struct nfgenmsg *nfmsg;
 313        struct sk_buff *entskb = entry->skb;
 314        struct net_device *indev;
 315        struct net_device *outdev;
 316        struct nf_conn *ct = NULL;
 317        enum ip_conntrack_info uninitialized_var(ctinfo);
 318        bool csum_verify;
 319
 320        size =    nlmsg_total_size(sizeof(struct nfgenmsg))
 321                + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
 322                + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 323                + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 324#ifdef CONFIG_BRIDGE_NETFILTER
 325                + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 326                + nla_total_size(sizeof(u_int32_t))     /* ifindex */
 327#endif
 328                + nla_total_size(sizeof(u_int32_t))     /* mark */
 329                + nla_total_size(sizeof(struct nfqnl_msg_packet_hw))
 330                + nla_total_size(sizeof(u_int32_t))     /* skbinfo */
 331                + nla_total_size(sizeof(u_int32_t));    /* cap_len */
 332
 333        if (entskb->tstamp.tv64)
 334                size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp));
 335
 336        if (entry->hook <= NF_INET_FORWARD ||
 337           (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL))
 338                csum_verify = !skb_csum_unnecessary(entskb);
 339        else
 340                csum_verify = false;
 341
 342        outdev = entry->outdev;
 343
 344        switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) {
 345        case NFQNL_COPY_META:
 346        case NFQNL_COPY_NONE:
 347                break;
 348
 349        case NFQNL_COPY_PACKET:
 350                if (!(queue->flags & NFQA_CFG_F_GSO) &&
 351                    entskb->ip_summed == CHECKSUM_PARTIAL &&
 352                    skb_checksum_help(entskb))
 353                        return NULL;
 354
 355                data_len = ACCESS_ONCE(queue->copy_range);
 356                if (data_len > entskb->len)
 357                        data_len = entskb->len;
 358
 359                if (!entskb->head_frag ||
 360                    skb_headlen(entskb) < L1_CACHE_BYTES ||
 361                    skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS)
 362                        hlen = skb_headlen(entskb);
 363
 364                if (skb_has_frag_list(entskb))
 365                        hlen = entskb->len;
 366                hlen = min_t(int, data_len, hlen);
 367                size += sizeof(struct nlattr) + hlen;
 368                cap_len = entskb->len;
 369                break;
 370        }
 371
 372        if (queue->flags & NFQA_CFG_F_CONNTRACK)
 373                ct = nfqnl_ct_get(entskb, &size, &ctinfo);
 374
 375        skb = nfnetlink_alloc_skb(&init_net, size, queue->peer_portid,
 376                                  GFP_ATOMIC);
 377        if (!skb)
 378                return NULL;
 379
 380        nlh = nlmsg_put(skb, 0, 0,
 381                        NFNL_SUBSYS_QUEUE << 8 | NFQNL_MSG_PACKET,
 382                        sizeof(struct nfgenmsg), 0);
 383        if (!nlh) {
 384                kfree_skb(skb);
 385                return NULL;
 386        }
 387        nfmsg = nlmsg_data(nlh);
 388        nfmsg->nfgen_family = entry->pf;
 389        nfmsg->version = NFNETLINK_V0;
 390        nfmsg->res_id = htons(queue->queue_num);
 391
 392        nla = __nla_reserve(skb, NFQA_PACKET_HDR, sizeof(*pmsg));
 393        pmsg = nla_data(nla);
 394        pmsg->hw_protocol       = entskb->protocol;
 395        pmsg->hook              = entry->hook;
 396        *packet_id_ptr          = &pmsg->packet_id;
 397
 398        indev = entry->indev;
 399        if (indev) {
 400#ifndef CONFIG_BRIDGE_NETFILTER
 401                if (nla_put_be32(skb, NFQA_IFINDEX_INDEV, htonl(indev->ifindex)))
 402                        goto nla_put_failure;
 403#else
 404                if (entry->pf == PF_BRIDGE) {
 405                        /* Case 1: indev is physical input device, we need to
 406                         * look for bridge group (when called from
 407                         * netfilter_bridge) */
 408                        if (nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 409                                         htonl(indev->ifindex)) ||
 410                        /* this is the bridge group "brX" */
 411                        /* rcu_read_lock()ed by __nf_queue */
 412                            nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 413                                         htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
 414                                goto nla_put_failure;
 415                } else {
 416                        /* Case 2: indev is bridge group, we need to look for
 417                         * physical device (when called from ipv4) */
 418                        if (nla_put_be32(skb, NFQA_IFINDEX_INDEV,
 419                                         htonl(indev->ifindex)))
 420                                goto nla_put_failure;
 421                        if (entskb->nf_bridge && entskb->nf_bridge->physindev &&
 422                            nla_put_be32(skb, NFQA_IFINDEX_PHYSINDEV,
 423                                         htonl(entskb->nf_bridge->physindev->ifindex)))
 424                                goto nla_put_failure;
 425                }
 426#endif
 427        }
 428
 429        if (outdev) {
 430#ifndef CONFIG_BRIDGE_NETFILTER
 431                if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV, htonl(outdev->ifindex)))
 432                        goto nla_put_failure;
 433#else
 434                if (entry->pf == PF_BRIDGE) {
 435                        /* Case 1: outdev is physical output device, we need to
 436                         * look for bridge group (when called from
 437                         * netfilter_bridge) */
 438                        if (nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 439                                         htonl(outdev->ifindex)) ||
 440                        /* this is the bridge group "brX" */
 441                        /* rcu_read_lock()ed by __nf_queue */
 442                            nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 443                                         htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
 444                                goto nla_put_failure;
 445                } else {
 446                        /* Case 2: outdev is bridge group, we need to look for
 447                         * physical output device (when called from ipv4) */
 448                        if (nla_put_be32(skb, NFQA_IFINDEX_OUTDEV,
 449                                         htonl(outdev->ifindex)))
 450                                goto nla_put_failure;
 451                        if (entskb->nf_bridge && entskb->nf_bridge->physoutdev &&
 452                            nla_put_be32(skb, NFQA_IFINDEX_PHYSOUTDEV,
 453                                         htonl(entskb->nf_bridge->physoutdev->ifindex)))
 454                                goto nla_put_failure;
 455                }
 456#endif
 457        }
 458
 459        if (entskb->mark &&
 460            nla_put_be32(skb, NFQA_MARK, htonl(entskb->mark)))
 461                goto nla_put_failure;
 462
 463        if (indev && entskb->dev &&
 464            entskb->mac_header != entskb->network_header) {
 465                struct nfqnl_msg_packet_hw phw;
 466                int len;
 467
 468                memset(&phw, 0, sizeof(phw));
 469                len = dev_parse_header(entskb, phw.hw_addr);
 470                if (len) {
 471                        phw.hw_addrlen = htons(len);
 472                        if (nla_put(skb, NFQA_HWADDR, sizeof(phw), &phw))
 473                                goto nla_put_failure;
 474                }
 475        }
 476
 477        if (entskb->tstamp.tv64) {
 478                struct nfqnl_msg_packet_timestamp ts;
 479                struct timeval tv = ktime_to_timeval(entskb->tstamp);
 480                ts.sec = cpu_to_be64(tv.tv_sec);
 481                ts.usec = cpu_to_be64(tv.tv_usec);
 482
 483                if (nla_put(skb, NFQA_TIMESTAMP, sizeof(ts), &ts))
 484                        goto nla_put_failure;
 485        }
 486
 487        if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
 488                goto nla_put_failure;
 489
 490        if (cap_len > data_len &&
 491            nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len)))
 492                goto nla_put_failure;
 493
 494        if (nfqnl_put_packet_info(skb, entskb, csum_verify))
 495                goto nla_put_failure;
 496
 497        if (data_len) {
 498                struct nlattr *nla;
 499
 500                if (skb_tailroom(skb) < sizeof(*nla) + hlen)
 501                        goto nla_put_failure;
 502
 503                nla = (struct nlattr *)skb_put(skb, sizeof(*nla));
 504                nla->nla_type = NFQA_PAYLOAD;
 505                nla->nla_len = nla_attr_size(data_len);
 506
 507                nfqnl_zcopy(skb, entskb, data_len, hlen);
 508        }
 509
 510        nlh->nlmsg_len = skb->len;
 511        return skb;
 512
 513nla_put_failure:
 514        kfree_skb(skb);
 515        net_err_ratelimited("nf_queue: error creating packet message\n");
 516        return NULL;
 517}
 518
 519static int
 520__nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue,
 521                        struct nf_queue_entry *entry)
 522{
 523        struct sk_buff *nskb;
 524        int err = -ENOBUFS;
 525        __be32 *packet_id_ptr;
 526        int failopen = 0;
 527
 528        nskb = nfqnl_build_packet_message(queue, entry, &packet_id_ptr);
 529        if (nskb == NULL) {
 530                err = -ENOMEM;
 531                goto err_out;
 532        }
 533        spin_lock_bh(&queue->lock);
 534
 535        if (queue->queue_total >= queue->queue_maxlen) {
 536                if (queue->flags & NFQA_CFG_F_FAIL_OPEN) {
 537                        failopen = 1;
 538                        err = 0;
 539                } else {
 540                        queue->queue_dropped++;
 541                        net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
 542                                             queue->queue_total);
 543                }
 544                goto err_out_free_nskb;
 545        }
 546        entry->id = ++queue->id_sequence;
 547        *packet_id_ptr = htonl(entry->id);
 548
 549        /* nfnetlink_unicast will either free the nskb or add it to a socket */
 550        err = nfnetlink_unicast(nskb, net, queue->peer_portid, MSG_DONTWAIT);
 551        if (err < 0) {
 552                queue->queue_user_dropped++;
 553                goto err_out_unlock;
 554        }
 555
 556        __enqueue_entry(queue, entry);
 557
 558        spin_unlock_bh(&queue->lock);
 559        return 0;
 560
 561err_out_free_nskb:
 562        kfree_skb(nskb);
 563err_out_unlock:
 564        spin_unlock_bh(&queue->lock);
 565        if (failopen)
 566                nf_reinject(entry, NF_ACCEPT);
 567err_out:
 568        return err;
 569}
 570
 571static struct nf_queue_entry *
 572nf_queue_entry_dup(struct nf_queue_entry *e)
 573{
 574        struct nf_queue_entry *entry = kmemdup(e, e->size, GFP_ATOMIC);
 575        if (entry) {
 576                if (nf_queue_entry_get_refs(entry))
 577                        return entry;
 578                kfree(entry);
 579        }
 580        return NULL;
 581}
 582
 583#ifdef CONFIG_BRIDGE_NETFILTER
 584/* When called from bridge netfilter, skb->data must point to MAC header
 585 * before calling skb_gso_segment(). Else, original MAC header is lost
 586 * and segmented skbs will be sent to wrong destination.
 587 */
 588static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
 589{
 590        if (skb->nf_bridge)
 591                __skb_push(skb, skb->network_header - skb->mac_header);
 592}
 593
 594static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
 595{
 596        if (skb->nf_bridge)
 597                __skb_pull(skb, skb->network_header - skb->mac_header);
 598}
 599#else
 600#define nf_bridge_adjust_skb_data(s) do {} while (0)
 601#define nf_bridge_adjust_segmented_data(s) do {} while (0)
 602#endif
 603
 604static void free_entry(struct nf_queue_entry *entry)
 605{
 606        nf_queue_entry_release_refs(entry);
 607        kfree(entry);
 608}
 609
 610static int
 611__nfqnl_enqueue_packet_gso(struct net *net, struct nfqnl_instance *queue,
 612                           struct sk_buff *skb, struct nf_queue_entry *entry)
 613{
 614        int ret = -ENOMEM;
 615        struct nf_queue_entry *entry_seg;
 616
 617        nf_bridge_adjust_segmented_data(skb);
 618
 619        if (skb->next == NULL) { /* last packet, no need to copy entry */
 620                struct sk_buff *gso_skb = entry->skb;
 621                entry->skb = skb;
 622                ret = __nfqnl_enqueue_packet(net, queue, entry);
 623                if (ret)
 624                        entry->skb = gso_skb;
 625                return ret;
 626        }
 627
 628        skb->next = NULL;
 629
 630        entry_seg = nf_queue_entry_dup(entry);
 631        if (entry_seg) {
 632                entry_seg->skb = skb;
 633                ret = __nfqnl_enqueue_packet(net, queue, entry_seg);
 634                if (ret)
 635                        free_entry(entry_seg);
 636        }
 637        return ret;
 638}
 639
 640static int
 641nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 642{
 643        unsigned int queued;
 644        struct nfqnl_instance *queue;
 645        struct sk_buff *skb, *segs;
 646        int err = -ENOBUFS;
 647        struct net *net = dev_net(entry->indev ?
 648                                  entry->indev : entry->outdev);
 649        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 650
 651        /* rcu_read_lock()ed by nf_hook_slow() */
 652        queue = instance_lookup(q, queuenum);
 653        if (!queue)
 654                return -ESRCH;
 655
 656        if (queue->copy_mode == NFQNL_COPY_NONE)
 657                return -EINVAL;
 658
 659        skb = entry->skb;
 660
 661        switch (entry->pf) {
 662        case NFPROTO_IPV4:
 663                skb->protocol = htons(ETH_P_IP);
 664                break;
 665        case NFPROTO_IPV6:
 666                skb->protocol = htons(ETH_P_IPV6);
 667                break;
 668        }
 669
 670        if ((queue->flags & NFQA_CFG_F_GSO) || !skb_is_gso(skb))
 671                return __nfqnl_enqueue_packet(net, queue, entry);
 672
 673        nf_bridge_adjust_skb_data(skb);
 674        segs = skb_gso_segment(skb, 0);
 675        /* Does not use PTR_ERR to limit the number of error codes that can be
 676         * returned by nf_queue.  For instance, callers rely on -ECANCELED to
 677         * mean 'ignore this hook'.
 678         */
 679        if (IS_ERR(segs))
 680                goto out_err;
 681        queued = 0;
 682        err = 0;
 683        do {
 684                struct sk_buff *nskb = segs->next;
 685                if (err == 0)
 686                        err = __nfqnl_enqueue_packet_gso(net, queue,
 687                                                        segs, entry);
 688                if (err == 0)
 689                        queued++;
 690                else
 691                        kfree_skb(segs);
 692                segs = nskb;
 693        } while (segs);
 694
 695        if (queued) {
 696                if (err) /* some segments are already queued */
 697                        free_entry(entry);
 698                kfree_skb(skb);
 699                return 0;
 700        }
 701 out_err:
 702        nf_bridge_adjust_segmented_data(skb);
 703        return err;
 704}
 705
 706static int
 707nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff)
 708{
 709        struct sk_buff *nskb;
 710
 711        if (diff < 0) {
 712                if (pskb_trim(e->skb, data_len))
 713                        return -ENOMEM;
 714        } else if (diff > 0) {
 715                if (data_len > 0xFFFF)
 716                        return -EINVAL;
 717                if (diff > skb_tailroom(e->skb)) {
 718                        nskb = skb_copy_expand(e->skb, skb_headroom(e->skb),
 719                                               diff, GFP_ATOMIC);
 720                        if (!nskb) {
 721                                printk(KERN_WARNING "nf_queue: OOM "
 722                                      "in mangle, dropping packet\n");
 723                                return -ENOMEM;
 724                        }
 725                        kfree_skb(e->skb);
 726                        e->skb = nskb;
 727                }
 728                skb_put(e->skb, diff);
 729        }
 730        if (!skb_make_writable(e->skb, data_len))
 731                return -ENOMEM;
 732        skb_copy_to_linear_data(e->skb, data, data_len);
 733        e->skb->ip_summed = CHECKSUM_NONE;
 734        return 0;
 735}
 736
 737static int
 738nfqnl_set_mode(struct nfqnl_instance *queue,
 739               unsigned char mode, unsigned int range)
 740{
 741        int status = 0;
 742
 743        spin_lock_bh(&queue->lock);
 744        switch (mode) {
 745        case NFQNL_COPY_NONE:
 746        case NFQNL_COPY_META:
 747                queue->copy_mode = mode;
 748                queue->copy_range = 0;
 749                break;
 750
 751        case NFQNL_COPY_PACKET:
 752                queue->copy_mode = mode;
 753                if (range == 0 || range > NFQNL_MAX_COPY_RANGE)
 754                        queue->copy_range = NFQNL_MAX_COPY_RANGE;
 755                else
 756                        queue->copy_range = range;
 757                break;
 758
 759        default:
 760                status = -EINVAL;
 761
 762        }
 763        spin_unlock_bh(&queue->lock);
 764
 765        return status;
 766}
 767
 768static int
 769dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
 770{
 771        if (entry->indev)
 772                if (entry->indev->ifindex == ifindex)
 773                        return 1;
 774        if (entry->outdev)
 775                if (entry->outdev->ifindex == ifindex)
 776                        return 1;
 777#ifdef CONFIG_BRIDGE_NETFILTER
 778        if (entry->skb->nf_bridge) {
 779                if (entry->skb->nf_bridge->physindev &&
 780                    entry->skb->nf_bridge->physindev->ifindex == ifindex)
 781                        return 1;
 782                if (entry->skb->nf_bridge->physoutdev &&
 783                    entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
 784                        return 1;
 785        }
 786#endif
 787        return 0;
 788}
 789
 790/* drop all packets with either indev or outdev == ifindex from all queue
 791 * instances */
 792static void
 793nfqnl_dev_drop(struct net *net, int ifindex)
 794{
 795        int i;
 796        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 797
 798        rcu_read_lock();
 799
 800        for (i = 0; i < INSTANCE_BUCKETS; i++) {
 801                struct nfqnl_instance *inst;
 802                struct hlist_head *head = &q->instance_table[i];
 803
 804                hlist_for_each_entry_rcu(inst, head, hlist)
 805                        nfqnl_flush(inst, dev_cmp, ifindex);
 806        }
 807
 808        rcu_read_unlock();
 809}
 810
 811#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
 812
 813static int
 814nfqnl_rcv_dev_event(struct notifier_block *this,
 815                    unsigned long event, void *ptr)
 816{
 817        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 818
 819        /* Drop any packets associated with the downed device */
 820        if (event == NETDEV_DOWN)
 821                nfqnl_dev_drop(dev_net(dev), dev->ifindex);
 822        return NOTIFY_DONE;
 823}
 824
 825static struct notifier_block nfqnl_dev_notifier = {
 826        .notifier_call  = nfqnl_rcv_dev_event,
 827};
 828
 829static int
 830nfqnl_rcv_nl_event(struct notifier_block *this,
 831                   unsigned long event, void *ptr)
 832{
 833        struct netlink_notify *n = ptr;
 834        struct nfnl_queue_net *q = nfnl_queue_pernet(n->net);
 835
 836        if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
 837                int i;
 838
 839                /* destroy all instances for this portid */
 840                spin_lock(&q->instances_lock);
 841                for (i = 0; i < INSTANCE_BUCKETS; i++) {
 842                        struct hlist_node *t2;
 843                        struct nfqnl_instance *inst;
 844                        struct hlist_head *head = &q->instance_table[i];
 845
 846                        hlist_for_each_entry_safe(inst, t2, head, hlist) {
 847                                if (n->portid == inst->peer_portid)
 848                                        __instance_destroy(inst);
 849                        }
 850                }
 851                spin_unlock(&q->instances_lock);
 852        }
 853        return NOTIFY_DONE;
 854}
 855
 856static struct notifier_block nfqnl_rtnl_notifier = {
 857        .notifier_call  = nfqnl_rcv_nl_event,
 858};
 859
 860static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
 861        [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 862        [NFQA_MARK]             = { .type = NLA_U32 },
 863        [NFQA_PAYLOAD]          = { .type = NLA_UNSPEC },
 864        [NFQA_CT]               = { .type = NLA_UNSPEC },
 865};
 866
 867static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
 868        [NFQA_VERDICT_HDR]      = { .len = sizeof(struct nfqnl_msg_verdict_hdr) },
 869        [NFQA_MARK]             = { .type = NLA_U32 },
 870};
 871
 872static struct nfqnl_instance *
 873verdict_instance_lookup(struct nfnl_queue_net *q, u16 queue_num, int nlportid)
 874{
 875        struct nfqnl_instance *queue;
 876
 877        queue = instance_lookup(q, queue_num);
 878        if (!queue)
 879                return ERR_PTR(-ENODEV);
 880
 881        if (queue->peer_portid != nlportid)
 882                return ERR_PTR(-EPERM);
 883
 884        return queue;
 885}
 886
 887static struct nfqnl_msg_verdict_hdr*
 888verdicthdr_get(const struct nlattr * const nfqa[])
 889{
 890        struct nfqnl_msg_verdict_hdr *vhdr;
 891        unsigned int verdict;
 892
 893        if (!nfqa[NFQA_VERDICT_HDR])
 894                return NULL;
 895
 896        vhdr = nla_data(nfqa[NFQA_VERDICT_HDR]);
 897        verdict = ntohl(vhdr->verdict) & NF_VERDICT_MASK;
 898        if (verdict > NF_MAX_VERDICT || verdict == NF_STOLEN)
 899                return NULL;
 900        return vhdr;
 901}
 902
 903static int nfq_id_after(unsigned int id, unsigned int max)
 904{
 905        return (int)(id - max) > 0;
 906}
 907
 908static int
 909nfqnl_recv_verdict_batch(struct sock *ctnl, struct sk_buff *skb,
 910                   const struct nlmsghdr *nlh,
 911                   const struct nlattr * const nfqa[])
 912{
 913        struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 914        struct nf_queue_entry *entry, *tmp;
 915        unsigned int verdict, maxid;
 916        struct nfqnl_msg_verdict_hdr *vhdr;
 917        struct nfqnl_instance *queue;
 918        LIST_HEAD(batch_list);
 919        u16 queue_num = ntohs(nfmsg->res_id);
 920
 921        struct net *net = sock_net(ctnl);
 922        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 923
 924        queue = verdict_instance_lookup(q, queue_num,
 925                                        NETLINK_CB(skb).portid);
 926        if (IS_ERR(queue))
 927                return PTR_ERR(queue);
 928
 929        vhdr = verdicthdr_get(nfqa);
 930        if (!vhdr)
 931                return -EINVAL;
 932
 933        verdict = ntohl(vhdr->verdict);
 934        maxid = ntohl(vhdr->id);
 935
 936        spin_lock_bh(&queue->lock);
 937
 938        list_for_each_entry_safe(entry, tmp, &queue->queue_list, list) {
 939                if (nfq_id_after(entry->id, maxid))
 940                        break;
 941                __dequeue_entry(queue, entry);
 942                list_add_tail(&entry->list, &batch_list);
 943        }
 944
 945        spin_unlock_bh(&queue->lock);
 946
 947        if (list_empty(&batch_list))
 948                return -ENOENT;
 949
 950        list_for_each_entry_safe(entry, tmp, &batch_list, list) {
 951                if (nfqa[NFQA_MARK])
 952                        entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
 953                nf_reinject(entry, verdict);
 954        }
 955        return 0;
 956}
 957
 958static int
 959nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
 960                   const struct nlmsghdr *nlh,
 961                   const struct nlattr * const nfqa[])
 962{
 963        struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 964        u_int16_t queue_num = ntohs(nfmsg->res_id);
 965
 966        struct nfqnl_msg_verdict_hdr *vhdr;
 967        struct nfqnl_instance *queue;
 968        unsigned int verdict;
 969        struct nf_queue_entry *entry;
 970        enum ip_conntrack_info uninitialized_var(ctinfo);
 971        struct nf_conn *ct = NULL;
 972
 973        struct net *net = sock_net(ctnl);
 974        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
 975
 976        queue = instance_lookup(q, queue_num);
 977        if (!queue)
 978                queue = verdict_instance_lookup(q, queue_num,
 979                                                NETLINK_CB(skb).portid);
 980        if (IS_ERR(queue))
 981                return PTR_ERR(queue);
 982
 983        vhdr = verdicthdr_get(nfqa);
 984        if (!vhdr)
 985                return -EINVAL;
 986
 987        verdict = ntohl(vhdr->verdict);
 988
 989        entry = find_dequeue_entry(queue, ntohl(vhdr->id));
 990        if (entry == NULL)
 991                return -ENOENT;
 992
 993        rcu_read_lock();
 994        if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
 995                ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
 996
 997        if (nfqa[NFQA_PAYLOAD]) {
 998                u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
 999                int diff = payload_len - entry->skb->len;
1000
1001                if (nfqnl_mangle(nla_data(nfqa[NFQA_PAYLOAD]),
1002                                 payload_len, entry, diff) < 0)
1003                        verdict = NF_DROP;
1004
1005                if (ct)
1006                        nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
1007        }
1008        rcu_read_unlock();
1009
1010        if (nfqa[NFQA_MARK])
1011                entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
1012
1013        nf_reinject(entry, verdict);
1014        return 0;
1015}
1016
1017static int
1018nfqnl_recv_unsupp(struct sock *ctnl, struct sk_buff *skb,
1019                  const struct nlmsghdr *nlh,
1020                  const struct nlattr * const nfqa[])
1021{
1022        return -ENOTSUPP;
1023}
1024
1025static const struct nla_policy nfqa_cfg_policy[NFQA_CFG_MAX+1] = {
1026        [NFQA_CFG_CMD]          = { .len = sizeof(struct nfqnl_msg_config_cmd) },
1027        [NFQA_CFG_PARAMS]       = { .len = sizeof(struct nfqnl_msg_config_params) },
1028};
1029
1030static const struct nf_queue_handler nfqh = {
1031        .outfn  = &nfqnl_enqueue_packet,
1032};
1033
1034static int
1035nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
1036                  const struct nlmsghdr *nlh,
1037                  const struct nlattr * const nfqa[])
1038{
1039        struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1040        u_int16_t queue_num = ntohs(nfmsg->res_id);
1041        struct nfqnl_instance *queue;
1042        struct nfqnl_msg_config_cmd *cmd = NULL;
1043        struct net *net = sock_net(ctnl);
1044        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1045        int ret = 0;
1046
1047        if (nfqa[NFQA_CFG_CMD]) {
1048                cmd = nla_data(nfqa[NFQA_CFG_CMD]);
1049
1050                /* Obsolete commands without queue context */
1051                switch (cmd->command) {
1052                case NFQNL_CFG_CMD_PF_BIND: return 0;
1053                case NFQNL_CFG_CMD_PF_UNBIND: return 0;
1054                }
1055        }
1056
1057        rcu_read_lock();
1058        queue = instance_lookup(q, queue_num);
1059        if (queue && queue->peer_portid != NETLINK_CB(skb).portid) {
1060                ret = -EPERM;
1061                goto err_out_unlock;
1062        }
1063
1064        if (cmd != NULL) {
1065                switch (cmd->command) {
1066                case NFQNL_CFG_CMD_BIND:
1067                        if (queue) {
1068                                ret = -EBUSY;
1069                                goto err_out_unlock;
1070                        }
1071                        queue = instance_create(q, queue_num,
1072                                                NETLINK_CB(skb).portid);
1073                        if (IS_ERR(queue)) {
1074                                ret = PTR_ERR(queue);
1075                                goto err_out_unlock;
1076                        }
1077                        break;
1078                case NFQNL_CFG_CMD_UNBIND:
1079                        if (!queue) {
1080                                ret = -ENODEV;
1081                                goto err_out_unlock;
1082                        }
1083                        instance_destroy(q, queue);
1084                        break;
1085                case NFQNL_CFG_CMD_PF_BIND:
1086                case NFQNL_CFG_CMD_PF_UNBIND:
1087                        break;
1088                default:
1089                        ret = -ENOTSUPP;
1090                        break;
1091                }
1092        }
1093
1094        if (nfqa[NFQA_CFG_PARAMS]) {
1095                struct nfqnl_msg_config_params *params;
1096
1097                if (!queue) {
1098                        ret = -ENODEV;
1099                        goto err_out_unlock;
1100                }
1101                params = nla_data(nfqa[NFQA_CFG_PARAMS]);
1102                nfqnl_set_mode(queue, params->copy_mode,
1103                                ntohl(params->copy_range));
1104        }
1105
1106        if (nfqa[NFQA_CFG_QUEUE_MAXLEN]) {
1107                __be32 *queue_maxlen;
1108
1109                if (!queue) {
1110                        ret = -ENODEV;
1111                        goto err_out_unlock;
1112                }
1113                queue_maxlen = nla_data(nfqa[NFQA_CFG_QUEUE_MAXLEN]);
1114                spin_lock_bh(&queue->lock);
1115                queue->queue_maxlen = ntohl(*queue_maxlen);
1116                spin_unlock_bh(&queue->lock);
1117        }
1118
1119        if (nfqa[NFQA_CFG_FLAGS]) {
1120                __u32 flags, mask;
1121
1122                if (!queue) {
1123                        ret = -ENODEV;
1124                        goto err_out_unlock;
1125                }
1126
1127                if (!nfqa[NFQA_CFG_MASK]) {
1128                        /* A mask is needed to specify which flags are being
1129                         * changed.
1130                         */
1131                        ret = -EINVAL;
1132                        goto err_out_unlock;
1133                }
1134
1135                flags = ntohl(nla_get_be32(nfqa[NFQA_CFG_FLAGS]));
1136                mask = ntohl(nla_get_be32(nfqa[NFQA_CFG_MASK]));
1137
1138                if (flags >= NFQA_CFG_F_MAX) {
1139                        ret = -EOPNOTSUPP;
1140                        goto err_out_unlock;
1141                }
1142
1143                spin_lock_bh(&queue->lock);
1144                queue->flags &= ~mask;
1145                queue->flags |= flags & mask;
1146                spin_unlock_bh(&queue->lock);
1147        }
1148
1149err_out_unlock:
1150        rcu_read_unlock();
1151        return ret;
1152}
1153
1154static const struct nfnl_callback nfqnl_cb[NFQNL_MSG_MAX] = {
1155        [NFQNL_MSG_PACKET]      = { .call_rcu = nfqnl_recv_unsupp,
1156                                    .attr_count = NFQA_MAX, },
1157        [NFQNL_MSG_VERDICT]     = { .call_rcu = nfqnl_recv_verdict,
1158                                    .attr_count = NFQA_MAX,
1159                                    .policy = nfqa_verdict_policy },
1160        [NFQNL_MSG_CONFIG]      = { .call = nfqnl_recv_config,
1161                                    .attr_count = NFQA_CFG_MAX,
1162                                    .policy = nfqa_cfg_policy },
1163        [NFQNL_MSG_VERDICT_BATCH]={ .call_rcu = nfqnl_recv_verdict_batch,
1164                                    .attr_count = NFQA_MAX,
1165                                    .policy = nfqa_verdict_batch_policy },
1166};
1167
1168static const struct nfnetlink_subsystem nfqnl_subsys = {
1169        .name           = "nf_queue",
1170        .subsys_id      = NFNL_SUBSYS_QUEUE,
1171        .cb_count       = NFQNL_MSG_MAX,
1172        .cb             = nfqnl_cb,
1173};
1174
1175#ifdef CONFIG_PROC_FS
1176struct iter_state {
1177        struct seq_net_private p;
1178        unsigned int bucket;
1179};
1180
1181static struct hlist_node *get_first(struct seq_file *seq)
1182{
1183        struct iter_state *st = seq->private;
1184        struct net *net;
1185        struct nfnl_queue_net *q;
1186
1187        if (!st)
1188                return NULL;
1189
1190        net = seq_file_net(seq);
1191        q = nfnl_queue_pernet(net);
1192        for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
1193                if (!hlist_empty(&q->instance_table[st->bucket]))
1194                        return q->instance_table[st->bucket].first;
1195        }
1196        return NULL;
1197}
1198
1199static struct hlist_node *get_next(struct seq_file *seq, struct hlist_node *h)
1200{
1201        struct iter_state *st = seq->private;
1202        struct net *net = seq_file_net(seq);
1203
1204        h = h->next;
1205        while (!h) {
1206                struct nfnl_queue_net *q;
1207
1208                if (++st->bucket >= INSTANCE_BUCKETS)
1209                        return NULL;
1210
1211                q = nfnl_queue_pernet(net);
1212                h = q->instance_table[st->bucket].first;
1213        }
1214        return h;
1215}
1216
1217static struct hlist_node *get_idx(struct seq_file *seq, loff_t pos)
1218{
1219        struct hlist_node *head;
1220        head = get_first(seq);
1221
1222        if (head)
1223                while (pos && (head = get_next(seq, head)))
1224                        pos--;
1225        return pos ? NULL : head;
1226}
1227
1228static void *seq_start(struct seq_file *s, loff_t *pos)
1229        __acquires(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1230{
1231        spin_lock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1232        return get_idx(s, *pos);
1233}
1234
1235static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
1236{
1237        (*pos)++;
1238        return get_next(s, v);
1239}
1240
1241static void seq_stop(struct seq_file *s, void *v)
1242        __releases(nfnl_queue_pernet(seq_file_net(s))->instances_lock)
1243{
1244        spin_unlock(&nfnl_queue_pernet(seq_file_net(s))->instances_lock);
1245}
1246
1247static int seq_show(struct seq_file *s, void *v)
1248{
1249        const struct nfqnl_instance *inst = v;
1250
1251        return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1252                          inst->queue_num,
1253                          inst->peer_portid, inst->queue_total,
1254                          inst->copy_mode, inst->copy_range,
1255                          inst->queue_dropped, inst->queue_user_dropped,
1256                          inst->id_sequence, 1);
1257}
1258
1259static const struct seq_operations nfqnl_seq_ops = {
1260        .start  = seq_start,
1261        .next   = seq_next,
1262        .stop   = seq_stop,
1263        .show   = seq_show,
1264};
1265
1266static int nfqnl_open(struct inode *inode, struct file *file)
1267{
1268        return seq_open_net(inode, file, &nfqnl_seq_ops,
1269                        sizeof(struct iter_state));
1270}
1271
1272static const struct file_operations nfqnl_file_ops = {
1273        .owner   = THIS_MODULE,
1274        .open    = nfqnl_open,
1275        .read    = seq_read,
1276        .llseek  = seq_lseek,
1277        .release = seq_release_net,
1278};
1279
1280#endif /* PROC_FS */
1281
1282static int __net_init nfnl_queue_net_init(struct net *net)
1283{
1284        unsigned int i;
1285        struct nfnl_queue_net *q = nfnl_queue_pernet(net);
1286
1287        for (i = 0; i < INSTANCE_BUCKETS; i++)
1288                INIT_HLIST_HEAD(&q->instance_table[i]);
1289
1290        spin_lock_init(&q->instances_lock);
1291
1292#ifdef CONFIG_PROC_FS
1293        if (!proc_create("nfnetlink_queue", 0440,
1294                         net->nf.proc_netfilter, &nfqnl_file_ops))
1295                return -ENOMEM;
1296#endif
1297        return 0;
1298}
1299
1300static void __net_exit nfnl_queue_net_exit(struct net *net)
1301{
1302#ifdef CONFIG_PROC_FS
1303        remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
1304#endif
1305}
1306
1307static struct pernet_operations nfnl_queue_net_ops = {
1308        .init   = nfnl_queue_net_init,
1309        .exit   = nfnl_queue_net_exit,
1310        .id     = &nfnl_queue_net_id,
1311        .size   = sizeof(struct nfnl_queue_net),
1312};
1313
1314static int __init nfnetlink_queue_init(void)
1315{
1316        int status = -ENOMEM;
1317
1318        netlink_register_notifier(&nfqnl_rtnl_notifier);
1319        status = nfnetlink_subsys_register(&nfqnl_subsys);
1320        if (status < 0) {
1321                pr_err("nf_queue: failed to create netlink socket\n");
1322                goto cleanup_netlink_notifier;
1323        }
1324
1325        status = register_pernet_subsys(&nfnl_queue_net_ops);
1326        if (status < 0) {
1327                pr_err("nf_queue: failed to register pernet ops\n");
1328                goto cleanup_subsys;
1329        }
1330        register_netdevice_notifier(&nfqnl_dev_notifier);
1331        nf_register_queue_handler(&nfqh);
1332        return status;
1333
1334cleanup_subsys:
1335        nfnetlink_subsys_unregister(&nfqnl_subsys);
1336cleanup_netlink_notifier:
1337        netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1338        return status;
1339}
1340
1341static void __exit nfnetlink_queue_fini(void)
1342{
1343        nf_unregister_queue_handler();
1344        unregister_netdevice_notifier(&nfqnl_dev_notifier);
1345        unregister_pernet_subsys(&nfnl_queue_net_ops);
1346        nfnetlink_subsys_unregister(&nfqnl_subsys);
1347        netlink_unregister_notifier(&nfqnl_rtnl_notifier);
1348
1349        rcu_barrier(); /* Wait for completion of call_rcu()'s */
1350}
1351
1352MODULE_DESCRIPTION("netfilter packet queue handler");
1353MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1354MODULE_LICENSE("GPL");
1355MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE);
1356
1357module_init(nfnetlink_queue_init);
1358module_exit(nfnetlink_queue_fini);
1359
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.