net/packet/af_packet.c

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              PACKET - implements raw packet sockets.
   7  *
   8  * Authors:     Ross Biro
   9  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  10  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  11  *
  12  * Fixes:
  13  *              Alan Cox        :       verify_area() now used correctly
  14  *              Alan Cox        :       new skbuff lists, look ma no backlogs!
  15  *              Alan Cox        :       tidied skbuff lists.
  16  *              Alan Cox        :       Now uses generic datagram routines I
  17  *                                      added. Also fixed the peek/read crash
  18  *                                      from all old Linux datagram code.
  19  *              Alan Cox        :       Uses the improved datagram code.
  20  *              Alan Cox        :       Added NULL's for socket options.
  21  *              Alan Cox        :       Re-commented the code.
  22  *              Alan Cox        :       Use new kernel side addressing
  23  *              Rob Janssen     :       Correct MTU usage.
  24  *              Dave Platt      :       Counter leaks caused by incorrect
  25  *                                      interrupt locking and some slightly
  26  *                                      dubious gcc output. Can you read
  27  *                                      compiler: it said _VOLATILE_
  28  *      Richard Kooijman        :       Timestamp fixes.
  29  *              Alan Cox        :       New buffers. Use sk->mac.raw.
  30  *              Alan Cox        :       sendmsg/recvmsg support.
  31  *              Alan Cox        :       Protocol setting support
  32  *      Alexey Kuznetsov        :       Untied from IPv4 stack.
  33  *      Cyrus Durgin            :       Fixed kerneld for kmod.
  34  *      Michal Ostrowski        :       Module initialization cleanup.
  35  *         Ulises Alonso        :       Frame number limit removal and
  36  *                                      packet_set_ring memory leak.
  37  *              Eric Biederman  :       Allow for > 8 byte hardware addresses.
  38  *                                      The convention is that longer addresses
  39  *                                      will simply extend the hardware address
  40  *                                      byte arrays at the end of sockaddr_ll
  41  *                                      and packet_mreq.
  42  *              Johann Baudy    :       Added TX RING.
  43  *
  44  *              This program is free software; you can redistribute it and/or
  45  *              modify it under the terms of the GNU General Public License
  46  *              as published by the Free Software Foundation; either version
  47  *              2 of the License, or (at your option) any later version.
  48  *
  49  */
  50
  51 #include <linux/types.h>
  52 #include <linux/mm.h>
  53 #include <linux/capability.h>
  54 #include <linux/fcntl.h>
  55 #include <linux/socket.h>
  56 #include <linux/in.h>
  57 #include <linux/inet.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/if_packet.h>
  60 #include <linux/wireless.h>
  61 #include <linux/kernel.h>
  62 #include <linux/kmod.h>
  63 #include <linux/slab.h>
  64 #include <linux/vmalloc.h>
  65 #include <net/net_namespace.h>
  66 #include <net/ip.h>
  67 #include <net/protocol.h>
  68 #include <linux/skbuff.h>
  69 #include <net/sock.h>
  70 #include <linux/errno.h>
  71 #include <linux/timer.h>
  72 #include <asm/system.h>
  73 #include <asm/uaccess.h>
  74 #include <asm/ioctls.h>
  75 #include <asm/page.h>
  76 #include <asm/cacheflush.h>
  77 #include <asm/io.h>
  78 #include <linux/proc_fs.h>
  79 #include <linux/seq_file.h>
  80 #include <linux/poll.h>
  81 #include <linux/module.h>
  82 #include <linux/init.h>
  83 #include <linux/mutex.h>
  84 #include <linux/if_vlan.h>
  85 #include <linux/virtio_net.h>
  86 #include <linux/errqueue.h>
  87 #include <linux/net_tstamp.h>
  88
  89 #ifdef CONFIG_INET
  90 #include <net/inet_common.h>
  91 #endif
  92
  93 /*
  94    Assumptions:
  95    - if device has no dev->hard_header routine, it adds and removes ll header
  96      inside itself. In this case ll header is invisible outside of device,
  97      but higher levels still should reserve dev->hard_header_len.
  98      Some devices are enough clever to reallocate skb, when header
  99      will not fit to reserved space (tunnel), another ones are silly
 100      (PPP).
 101    - packet socket receives packets with pulled ll header,
 102      so that SOCK_RAW should push it back.
 103
 104 On receive:
 105 -----------
 106
 107 Incoming, dev->hard_header!=NULL
 108    mac_header -> ll header
 109    data       -> data
 110
 111 Outgoing, dev->hard_header!=NULL
 112    mac_header -> ll header
 113    data       -> ll header
 114
 115 Incoming, dev->hard_header==NULL
 116    mac_header -> UNKNOWN position. It is very likely, that it points to ll
 117                  header.  PPP makes it, that is wrong, because introduce
 118                  assymetry between rx and tx paths.
 119    data       -> data
 120
 121 Outgoing, dev->hard_header==NULL
 122    mac_header -> data. ll header is still not built!
 123    data       -> data
 124
 125 Resume
 126   If dev->hard_header==NULL we are unlikely to restore sensible ll header.
 127
 128
 129 On transmit:
 130 ------------
 131
 132 dev->hard_header != NULL
 133    mac_header -> ll header
 134    data       -> ll header
 135
 136 dev->hard_header == NULL (ll header is added by device, we cannot control it)
 137    mac_header -> data
 138    data       -> data
 139
 140    We should set nh.raw on output to correct posistion,
 141    packet classifier depends on it.
 142  */
 143
 144 /* Private packet socket structures. */
 145
 146 struct packet_mclist {
 147         struct packet_mclist    *next;
 148         int                     ifindex;
 149         int                     count;
 150         unsigned short          type;
 151         unsigned short          alen;
 152         unsigned char           addr[MAX_ADDR_LEN];
 153 };
 154 /* identical to struct packet_mreq except it has
 155  * a longer address field.
 156  */
 157 struct packet_mreq_max {
 158         int             mr_ifindex;
 159         unsigned short  mr_type;
 160         unsigned short  mr_alen;
 161         unsigned char   mr_address[MAX_ADDR_LEN];
 162 };
 163
 164 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
 165                 int closing, int tx_ring);
 166
 167 struct pgv {
 168         char *buffer;
 169 };
 170
 171 struct packet_ring_buffer {
 172         struct pgv              *pg_vec;
 173         unsigned int            head;
 174         unsigned int            frames_per_block;
 175         unsigned int            frame_size;
 176         unsigned int            frame_max;
 177
 178         unsigned int            pg_vec_order;
 179         unsigned int            pg_vec_pages;
 180         unsigned int            pg_vec_len;
 181
 182         atomic_t                pending;
 183 };
 184
 185 struct packet_sock;
 186 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
 187
 188 static void packet_flush_mclist(struct sock *sk);
 189
 190 struct packet_sock {
 191         /* struct sock has to be the first member of packet_sock */
 192         struct sock             sk;
 193         struct tpacket_stats    stats;
 194         struct packet_ring_buffer       rx_ring;
 195         struct packet_ring_buffer       tx_ring;
 196         int                     copy_thresh;
 197         spinlock_t              bind_lock;
 198         struct mutex            pg_vec_lock;
 199         unsigned int            running:1,      /* prot_hook is attached*/
 200                                 auxdata:1,
 201                                 origdev:1,
 202                                 has_vnet_hdr:1;
 203         int                     ifindex;        /* bound device         */
 204         __be16                  num;
 205         struct packet_mclist    *mclist;
 206         atomic_t                mapped;
 207         enum tpacket_versions   tp_version;
 208         unsigned int            tp_hdrlen;
 209         unsigned int            tp_reserve;
 210         unsigned int            tp_loss:1;
 211         unsigned int            tp_tstamp;
 212         struct packet_type      prot_hook ____cacheline_aligned_in_smp;
 213 };
 214
 215 struct packet_skb_cb {
 216         unsigned int origlen;
 217         union {
 218                 struct sockaddr_pkt pkt;
 219                 struct sockaddr_ll ll;
 220         } sa;
 221 };
 222
 223 #define PACKET_SKB_CB(__skb)    ((struct packet_skb_cb *)((__skb)->cb))
 224
 225 static inline __pure struct page *pgv_to_page(void *addr)
 226 {
 227         if (is_vmalloc_addr(addr))
 228                 return vmalloc_to_page(addr);
 229         return virt_to_page(addr);
 230 }
 231
 232 static void __packet_set_status(struct packet_sock *po, void *frame, int status)
 233 {
 234         union {
 235                 struct tpacket_hdr *h1;
 236                 struct tpacket2_hdr *h2;
 237                 void *raw;
 238         } h;
 239
 240         h.raw = frame;
 241         switch (po->tp_version) {
 242         case TPACKET_V1:
 243                 h.h1->tp_status = status;
 244                 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
 245                 break;
 246         case TPACKET_V2:
 247                 h.h2->tp_status = status;
 248                 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
 249                 break;
 250         default:
 251                 pr_err("TPACKET version not supported\n");
 252                 BUG();
 253         }
 254
 255         smp_wmb();
 256 }
 257
 258 static int __packet_get_status(struct packet_sock *po, void *frame)
 259 {
 260         union {
 261                 struct tpacket_hdr *h1;
 262                 struct tpacket2_hdr *h2;
 263                 void *raw;
 264         } h;
 265
 266         smp_rmb();
 267
 268         h.raw = frame;
 269         switch (po->tp_version) {
 270         case TPACKET_V1:
 271                 flush_dcache_page(pgv_to_page(&h.h1->tp_status));
 272                 return h.h1->tp_status;
 273         case TPACKET_V2:
 274                 flush_dcache_page(pgv_to_page(&h.h2->tp_status));
 275                 return h.h2->tp_status;
 276         default:
 277                 pr_err("TPACKET version not supported\n");
 278                 BUG();
 279                 return 0;
 280         }
 281 }
 282
 283 static void *packet_lookup_frame(struct packet_sock *po,
 284                 struct packet_ring_buffer *rb,
 285                 unsigned int position,
 286                 int status)
 287 {
 288         unsigned int pg_vec_pos, frame_offset;
 289         union {
 290                 struct tpacket_hdr *h1;
 291                 struct tpacket2_hdr *h2;
 292                 void *raw;
 293         } h;
 294
 295         pg_vec_pos = position / rb->frames_per_block;
 296         frame_offset = position % rb->frames_per_block;
 297
 298         h.raw = rb->pg_vec[pg_vec_pos].buffer +
 299                 (frame_offset * rb->frame_size);
 300
 301         if (status != __packet_get_status(po, h.raw))
 302                 return NULL;
 303
 304         return h.raw;
 305 }
 306
 307 static inline void *packet_current_frame(struct packet_sock *po,
 308                 struct packet_ring_buffer *rb,
 309                 int status)
 310 {
 311         return packet_lookup_frame(po, rb, rb->head, status);
 312 }
 313
 314 static inline void *packet_previous_frame(struct packet_sock *po,
 315                 struct packet_ring_buffer *rb,
 316                 int status)
 317 {
 318         unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
 319         return packet_lookup_frame(po, rb, previous, status);
 320 }
 321
 322 static inline void packet_increment_head(struct packet_ring_buffer *buff)
 323 {
 324         buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
 325 }
 326
 327 static inline struct packet_sock *pkt_sk(struct sock *sk)
 328 {
 329         return (struct packet_sock *)sk;
 330 }
 331
 332 static void packet_sock_destruct(struct sock *sk)
 333 {
 334         skb_queue_purge(&sk->sk_error_queue);
 335
 336         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 337         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 338
 339         if (!sock_flag(sk, SOCK_DEAD)) {
 340                 pr_err("Attempt to release alive packet socket: %p\n", sk);
 341                 return;
 342         }
 343
 344         sk_refcnt_debug_dec(sk);
 345 }
 346
 347
 348 static const struct proto_ops packet_ops;
 349
 350 static const struct proto_ops packet_ops_spkt;
 351
 352 static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
 353                            struct packet_type *pt, struct net_device *orig_dev)
 354 {
 355         struct sock *sk;
 356         struct sockaddr_pkt *spkt;
 357
 358         /*
 359          *      When we registered the protocol we saved the socket in the data
 360          *      field for just this event.
 361          */
 362
 363         sk = pt->af_packet_priv;
 364
 365         /*
 366          *      Yank back the headers [hope the device set this
 367          *      right or kerboom...]
 368          *
 369          *      Incoming packets have ll header pulled,
 370          *      push it back.
 371          *
 372          *      For outgoing ones skb->data == skb_mac_header(skb)
 373          *      so that this procedure is noop.
 374          */
 375
 376         if (skb->pkt_type == PACKET_LOOPBACK)
 377                 goto out;
 378
 379         if (!net_eq(dev_net(dev), sock_net(sk)))
 380                 goto out;
 381
 382         skb = skb_share_check(skb, GFP_ATOMIC);
 383         if (skb == NULL)
 384                 goto oom;
 385
 386         /* drop any routing info */
 387         skb_dst_drop(skb);
 388
 389         /* drop conntrack reference */
 390         nf_reset(skb);
 391
 392         spkt = &PACKET_SKB_CB(skb)->sa.pkt;
 393
 394         skb_push(skb, skb->data - skb_mac_header(skb));
 395
 396         /*
 397          *      The SOCK_PACKET socket receives _all_ frames.
 398          */
 399
 400         spkt->spkt_family = dev->type;
 401         strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
 402         spkt->spkt_protocol = skb->protocol;
 403
 404         /*
 405          *      Charge the memory to the socket. This is done specifically
 406          *      to prevent sockets using all the memory up.
 407          */
 408
 409         if (sock_queue_rcv_skb(sk, skb) == 0)
 410                 return 0;
 411
 412 out:
 413         kfree_skb(skb);
 414 oom:
 415         return 0;
 416 }
 417
 418
 419 /*
 420  *      Output a raw packet to a device layer. This bypasses all the other
 421  *      protocol layers and you must therefore supply it with a complete frame
 422  */
 423
 424 static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
 425                                struct msghdr *msg, size_t len)
 426 {
 427         struct sock *sk = sock->sk;
 428         struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
 429         struct sk_buff *skb = NULL;
 430         struct net_device *dev;
 431         __be16 proto = 0;
 432         int err;
 433
 434         /*
 435          *      Get and verify the address.
 436          */
 437
 438         if (saddr) {
 439                 if (msg->msg_namelen < sizeof(struct sockaddr))
 440                         return -EINVAL;
 441                 if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
 442                         proto = saddr->spkt_protocol;
 443         } else
 444                 return -ENOTCONN;       /* SOCK_PACKET must be sent giving an address */
 445
 446         /*
 447          *      Find the device first to size check it
 448          */
 449
 450         saddr->spkt_device[13] = 0;
 451 retry:
 452         rcu_read_lock();
 453         dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
 454         err = -ENODEV;
 455         if (dev == NULL)
 456                 goto out_unlock;
 457
 458         err = -ENETDOWN;
 459         if (!(dev->flags & IFF_UP))
 460                 goto out_unlock;
 461
 462         /*
 463          * You may not queue a frame bigger than the mtu. This is the lowest level
 464          * raw protocol and you must do your own fragmentation at this level.
 465          */
 466
 467         err = -EMSGSIZE;
 468         if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
 469                 goto out_unlock;
 470
 471         if (!skb) {
 472                 size_t reserved = LL_RESERVED_SPACE(dev);
 473                 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
 474
 475                 rcu_read_unlock();
 476                 skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
 477                 if (skb == NULL)
 478                         return -ENOBUFS;
 479                 /* FIXME: Save some space for broken drivers that write a hard
 480                  * header at transmission time by themselves. PPP is the notable
 481                  * one here. This should really be fixed at the driver level.
 482                  */
 483                 skb_reserve(skb, reserved);
 484                 skb_reset_network_header(skb);
 485
 486                 /* Try to align data part correctly */
 487                 if (hhlen) {
 488                         skb->data -= hhlen;
 489                         skb->tail -= hhlen;
 490                         if (len < hhlen)
 491                                 skb_reset_network_header(skb);
 492                 }
 493                 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
 494                 if (err)
 495                         goto out_free;
 496                 goto retry;
 497         }
 498
 499         if (len > (dev->mtu + dev->hard_header_len)) {
 500                 /* Earlier code assumed this would be a VLAN pkt,
 501                  * double-check this now that we have the actual
 502                  * packet in hand.
 503                  */
 504                 struct ethhdr *ehdr;
 505                 skb_reset_mac_header(skb);
 506                 ehdr = eth_hdr(skb);
 507                 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
 508                         err = -EMSGSIZE;
 509                         goto out_unlock;
 510                 }
 511         }
 512
 513         skb->protocol = proto;
 514         skb->dev = dev;
 515         skb->priority = sk->sk_priority;
 516         skb->mark = sk->sk_mark;
 517         err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
 518         if (err < 0)
 519                 goto out_unlock;
 520
 521         dev_queue_xmit(skb);
 522         rcu_read_unlock();
 523         return len;
 524
 525 out_unlock:
 526         rcu_read_unlock();
 527 out_free:
 528         kfree_skb(skb);
 529         return err;
 530 }
 531
 532 static inline unsigned int run_filter(const struct sk_buff *skb,
 533                                       const struct sock *sk,
 534                                       unsigned int res)
 535 {
 536         struct sk_filter *filter;
 537
 538         rcu_read_lock();
 539         filter = rcu_dereference(sk->sk_filter);
 540         if (filter != NULL)
 541                 res = SK_RUN_FILTER(filter, skb);
 542         rcu_read_unlock();
 543
 544         return res;
 545 }
 546
 547 /*
 548  * This function makes lazy skb cloning in hope that most of packets
 549  * are discarded by BPF.
 550  *
 551  * Note tricky part: we DO mangle shared skb! skb->data, skb->len
 552  * and skb->cb are mangled. It works because (and until) packets
 553  * falling here are owned by current CPU. Output packets are cloned
 554  * by dev_queue_xmit_nit(), input packets are processed by net_bh
 555  * sequencially, so that if we return skb to original state on exit,
 556  * we will not harm anyone.
 557  */
 558
 559 static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
 560                       struct packet_type *pt, struct net_device *orig_dev)
 561 {
 562         struct sock *sk;
 563         struct sockaddr_ll *sll;
 564         struct packet_sock *po;
 565         u8 *skb_head = skb->data;
 566         int skb_len = skb->len;
 567         unsigned int snaplen, res;
 568
 569         if (skb->pkt_type == PACKET_LOOPBACK)
 570                 goto drop;
 571
 572         sk = pt->af_packet_priv;
 573         po = pkt_sk(sk);
 574
 575         if (!net_eq(dev_net(dev), sock_net(sk)))
 576                 goto drop;
 577
 578         skb->dev = dev;
 579
 580         if (dev->header_ops) {
 581                 /* The device has an explicit notion of ll header,
 582                  * exported to higher levels.
 583                  *
 584                  * Otherwise, the device hides details of its frame
 585                  * structure, so that corresponding packet head is
 586                  * never delivered to user.
 587                  */
 588                 if (sk->sk_type != SOCK_DGRAM)
 589                         skb_push(skb, skb->data - skb_mac_header(skb));
 590                 else if (skb->pkt_type == PACKET_OUTGOING) {
 591                         /* Special case: outgoing packets have ll header at head */
 592                         skb_pull(skb, skb_network_offset(skb));
 593                 }
 594         }
 595
 596         snaplen = skb->len;
 597
 598         res = run_filter(skb, sk, snaplen);
 599         if (!res)
 600                 goto drop_n_restore;
 601         if (snaplen > res)
 602                 snaplen = res;
 603
 604         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
 605             (unsigned)sk->sk_rcvbuf)
 606                 goto drop_n_acct;
 607
 608         if (skb_shared(skb)) {
 609                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
 610                 if (nskb == NULL)
 611                         goto drop_n_acct;
 612
 613                 if (skb_head != skb->data) {
 614                         skb->data = skb_head;
 615                         skb->len = skb_len;
 616                 }
 617                 kfree_skb(skb);
 618                 skb = nskb;
 619         }
 620
 621         BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
 622                      sizeof(skb->cb));
 623
 624         sll = &PACKET_SKB_CB(skb)->sa.ll;
 625         sll->sll_family = AF_PACKET;
 626         sll->sll_hatype = dev->type;
 627         sll->sll_protocol = skb->protocol;
 628         sll->sll_pkttype = skb->pkt_type;
 629         if (unlikely(po->origdev))
 630                 sll->sll_ifindex = orig_dev->ifindex;
 631         else
 632                 sll->sll_ifindex = dev->ifindex;
 633
 634         sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
 635
 636         PACKET_SKB_CB(skb)->origlen = skb->len;
 637
 638         if (pskb_trim(skb, snaplen))
 639                 goto drop_n_acct;
 640
 641         skb_set_owner_r(skb, sk);
 642         skb->dev = NULL;
 643         skb_dst_drop(skb);
 644
 645         /* drop conntrack reference */
 646         nf_reset(skb);
 647
 648         spin_lock(&sk->sk_receive_queue.lock);
 649         po->stats.tp_packets++;
 650         skb->dropcount = atomic_read(&sk->sk_drops);
 651         __skb_queue_tail(&sk->sk_receive_queue, skb);
 652         spin_unlock(&sk->sk_receive_queue.lock);
 653         sk->sk_data_ready(sk, skb->len);
 654         return 0;
 655
 656 drop_n_acct:
 657         po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
 658
 659 drop_n_restore:
 660         if (skb_head != skb->data && skb_shared(skb)) {
 661                 skb->data = skb_head;
 662                 skb->len = skb_len;
 663         }
 664 drop:
 665         consume_skb(skb);
 666         return 0;
 667 }
 668
 669 static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
 670                        struct packet_type *pt, struct net_device *orig_dev)
 671 {
 672         struct sock *sk;
 673         struct packet_sock *po;
 674         struct sockaddr_ll *sll;
 675         union {
 676                 struct tpacket_hdr *h1;
 677                 struct tpacket2_hdr *h2;
 678                 void *raw;
 679         } h;
 680         u8 *skb_head = skb->data;
 681         int skb_len = skb->len;
 682         unsigned int snaplen, res;
 683         unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
 684         unsigned short macoff, netoff, hdrlen;
 685         struct sk_buff *copy_skb = NULL;
 686         struct timeval tv;
 687         struct timespec ts;
 688         struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
 689
 690         if (skb->pkt_type == PACKET_LOOPBACK)
 691                 goto drop;
 692
 693         sk = pt->af_packet_priv;
 694         po = pkt_sk(sk);
 695
 696         if (!net_eq(dev_net(dev), sock_net(sk)))
 697                 goto drop;
 698
 699         if (dev->header_ops) {
 700                 if (sk->sk_type != SOCK_DGRAM)
 701                         skb_push(skb, skb->data - skb_mac_header(skb));
 702                 else if (skb->pkt_type == PACKET_OUTGOING) {
 703                         /* Special case: outgoing packets have ll header at head */
 704                         skb_pull(skb, skb_network_offset(skb));
 705                 }
 706         }
 707
 708         if (skb->ip_summed == CHECKSUM_PARTIAL)
 709                 status |= TP_STATUS_CSUMNOTREADY;
 710
 711         snaplen = skb->len;
 712
 713         res = run_filter(skb, sk, snaplen);
 714         if (!res)
 715                 goto drop_n_restore;
 716         if (snaplen > res)
 717                 snaplen = res;
 718
 719         if (sk->sk_type == SOCK_DGRAM) {
 720                 macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
 721                                   po->tp_reserve;
 722         } else {
 723                 unsigned maclen = skb_network_offset(skb);
 724                 netoff = TPACKET_ALIGN(po->tp_hdrlen +
 725                                        (maclen < 16 ? 16 : maclen)) +
 726                         po->tp_reserve;
 727                 macoff = netoff - maclen;
 728         }
 729
 730         if (macoff + snaplen > po->rx_ring.frame_size) {
 731                 if (po->copy_thresh &&
 732                     atomic_read(&sk->sk_rmem_alloc) + skb->truesize <
 733                     (unsigned)sk->sk_rcvbuf) {
 734                         if (skb_shared(skb)) {
 735                                 copy_skb = skb_clone(skb, GFP_ATOMIC);
 736                         } else {
 737                                 copy_skb = skb_get(skb);
 738                                 skb_head = skb->data;
 739                         }
 740                         if (copy_skb)
 741                                 skb_set_owner_r(copy_skb, sk);
 742                 }
 743                 snaplen = po->rx_ring.frame_size - macoff;
 744                 if ((int)snaplen < 0)
 745                         snaplen = 0;
 746         }
 747
 748         spin_lock(&sk->sk_receive_queue.lock);
 749         h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL);
 750         if (!h.raw)
 751                 goto ring_is_full;
 752         packet_increment_head(&po->rx_ring);
 753         po->stats.tp_packets++;
 754         if (copy_skb) {
 755                 status |= TP_STATUS_COPY;
 756                 __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
 757         }
 758         if (!po->stats.tp_drops)
 759                 status &= ~TP_STATUS_LOSING;
 760         spin_unlock(&sk->sk_receive_queue.lock);
 761
 762         skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
 763
 764         switch (po->tp_version) {
 765         case TPACKET_V1:
 766                 h.h1->tp_len = skb->len;
 767                 h.h1->tp_snaplen = snaplen;
 768                 h.h1->tp_mac = macoff;
 769                 h.h1->tp_net = netoff;
 770                 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
 771                                 && shhwtstamps->syststamp.tv64)
 772                         tv = ktime_to_timeval(shhwtstamps->syststamp);
 773                 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
 774                                 && shhwtstamps->hwtstamp.tv64)
 775                         tv = ktime_to_timeval(shhwtstamps->hwtstamp);
 776                 else if (skb->tstamp.tv64)
 777                         tv = ktime_to_timeval(skb->tstamp);
 778                 else
 779                         do_gettimeofday(&tv);
 780                 h.h1->tp_sec = tv.tv_sec;
 781                 h.h1->tp_usec = tv.tv_usec;
 782                 hdrlen = sizeof(*h.h1);
 783                 break;
 784         case TPACKET_V2:
 785                 h.h2->tp_len = skb->len;
 786                 h.h2->tp_snaplen = snaplen;
 787                 h.h2->tp_mac = macoff;
 788                 h.h2->tp_net = netoff;
 789                 if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
 790                                 && shhwtstamps->syststamp.tv64)
 791                         ts = ktime_to_timespec(shhwtstamps->syststamp);
 792                 else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
 793                                 && shhwtstamps->hwtstamp.tv64)
 794                         ts = ktime_to_timespec(shhwtstamps->hwtstamp);
 795                 else if (skb->tstamp.tv64)
 796                         ts = ktime_to_timespec(skb->tstamp);
 797                 else
 798                         getnstimeofday(&ts);
 799                 h.h2->tp_sec = ts.tv_sec;
 800                 h.h2->tp_nsec = ts.tv_nsec;
 801                 if (vlan_tx_tag_present(skb)) {
 802                         h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
 803                         status |= TP_STATUS_VLAN_VALID;
 804                 } else {
 805                         h.h2->tp_vlan_tci = 0;
 806                 }
 807                 hdrlen = sizeof(*h.h2);
 808                 break;
 809         default:
 810                 BUG();
 811         }
 812
 813         sll = h.raw + TPACKET_ALIGN(hdrlen);
 814         sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
 815         sll->sll_family = AF_PACKET;
 816         sll->sll_hatype = dev->type;
 817         sll->sll_protocol = skb->protocol;
 818         sll->sll_pkttype = skb->pkt_type;
 819         if (unlikely(po->origdev))
 820                 sll->sll_ifindex = orig_dev->ifindex;
 821         else
 822                 sll->sll_ifindex = dev->ifindex;
 823
 824         __packet_set_status(po, h.raw, status);
 825         smp_mb();
 826 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
 827         {
 828                 u8 *start, *end;
 829
 830                 end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
 831                 for (start = h.raw; start < end; start += PAGE_SIZE)
 832                         flush_dcache_page(pgv_to_page(start));
 833         }
 834 #endif
 835
 836         sk->sk_data_ready(sk, 0);
 837
 838 drop_n_restore:
 839         if (skb_head != skb->data && skb_shared(skb)) {
 840                 skb->data = skb_head;
 841                 skb->len = skb_len;
 842         }
 843 drop:
 844         kfree_skb(skb);
 845         return 0;
 846
 847 ring_is_full:
 848         po->stats.tp_drops++;
 849         spin_unlock(&sk->sk_receive_queue.lock);
 850
 851         sk->sk_data_ready(sk, 0);
 852         kfree_skb(copy_skb);
 853         goto drop_n_restore;
 854 }
 855
 856 static void tpacket_destruct_skb(struct sk_buff *skb)
 857 {
 858         struct packet_sock *po = pkt_sk(skb->sk);
 859         void *ph;
 860
 861         BUG_ON(skb == NULL);
 862
 863         if (likely(po->tx_ring.pg_vec)) {
 864                 ph = skb_shinfo(skb)->destructor_arg;
 865                 BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
 866                 BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
 867                 atomic_dec(&po->tx_ring.pending);
 868                 __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
 869         }
 870
 871         sock_wfree(skb);
 872 }
 873
 874 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
 875                 void *frame, struct net_device *dev, int size_max,
 876                 __be16 proto, unsigned char *addr)
 877 {
 878         union {
 879                 struct tpacket_hdr *h1;
 880                 struct tpacket2_hdr *h2;
 881                 void *raw;
 882         } ph;
 883         int to_write, offset, len, tp_len, nr_frags, len_max;
 884         struct socket *sock = po->sk.sk_socket;
 885         struct page *page;
 886         void *data;
 887         int err;
 888
 889         ph.raw = frame;
 890
 891         skb->protocol = proto;
 892         skb->dev = dev;
 893         skb->priority = po->sk.sk_priority;
 894         skb->mark = po->sk.sk_mark;
 895         skb_shinfo(skb)->destructor_arg = ph.raw;
 896
 897         switch (po->tp_version) {
 898         case TPACKET_V2:
 899                 tp_len = ph.h2->tp_len;
 900                 break;
 901         default:
 902                 tp_len = ph.h1->tp_len;
 903                 break;
 904         }
 905         if (unlikely(tp_len > size_max)) {
 906                 pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
 907                 return -EMSGSIZE;
 908         }
 909
 910         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 911         skb_reset_network_header(skb);
 912
 913         data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
 914         to_write = tp_len;
 915
 916         if (sock->type == SOCK_DGRAM) {
 917                 err = dev_hard_header(skb, dev, ntohs(proto), addr,
 918                                 NULL, tp_len);
 919                 if (unlikely(err < 0))
 920                         return -EINVAL;
 921         } else if (dev->hard_header_len) {
 922                 /* net device doesn't like empty head */
 923                 if (unlikely(tp_len <= dev->hard_header_len)) {
 924                         pr_err("packet size is too short (%d < %d)\n",
 925                                tp_len, dev->hard_header_len);
 926                         return -EINVAL;
 927                 }
 928
 929                 skb_push(skb, dev->hard_header_len);
 930                 err = skb_store_bits(skb, 0, data,
 931                                 dev->hard_header_len);
 932                 if (unlikely(err))
 933                         return err;
 934
 935                 data += dev->hard_header_len;
 936                 to_write -= dev->hard_header_len;
 937         }
 938
 939         err = -EFAULT;
 940         offset = offset_in_page(data);
 941         len_max = PAGE_SIZE - offset;
 942         len = ((to_write > len_max) ? len_max : to_write);
 943
 944         skb->data_len = to_write;
 945         skb->len += to_write;
 946         skb->truesize += to_write;
 947         atomic_add(to_write, &po->sk.sk_wmem_alloc);
 948
 949         while (likely(to_write)) {
 950                 nr_frags = skb_shinfo(skb)->nr_frags;
 951
 952                 if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
 953                         pr_err("Packet exceed the number of skb frags(%lu)\n",
 954                                MAX_SKB_FRAGS);
 955                         return -EFAULT;
 956                 }
 957
 958                 page = pgv_to_page(data);
 959                 data += len;
 960                 flush_dcache_page(page);
 961                 get_page(page);
 962                 skb_fill_page_desc(skb, nr_frags, page, offset, len);
 963                 to_write -= len;
 964                 offset = 0;
 965                 len_max = PAGE_SIZE;
 966                 len = ((to_write > len_max) ? len_max : to_write);
 967         }
 968
 969         return tp_len;
 970 }
 971
 972 static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
 973 {
 974         struct sk_buff *skb;
 975         struct net_device *dev;
 976         __be16 proto;
 977         bool need_rls_dev = false;
 978         int err, reserve = 0;
 979         void *ph;
 980         struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
 981         int tp_len, size_max;
 982         unsigned char *addr;
 983         int len_sum = 0;
 984         int status = 0;
 985
 986         mutex_lock(&po->pg_vec_lock);
 987
 988         err = -EBUSY;
 989         if (saddr == NULL) {
 990                 dev = po->prot_hook.dev;
 991                 proto   = po->num;
 992                 addr    = NULL;
 993         } else {
 994                 err = -EINVAL;
 995                 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
 996                         goto out;
 997                 if (msg->msg_namelen < (saddr->sll_halen
 998                                         + offsetof(struct sockaddr_ll,
 999                                                 sll_addr)))
1000                         goto out;
1001                 proto   = saddr->sll_protocol;
1002                 addr    = saddr->sll_addr;
1003                 dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
1004                 need_rls_dev = true;
1005         }
1006
1007         err = -ENXIO;
1008         if (unlikely(dev == NULL))
1009                 goto out;
1010
1011         reserve = dev->hard_header_len;
1012
1013         err = -ENETDOWN;
1014         if (unlikely(!(dev->flags & IFF_UP)))
1015                 goto out_put;
1016
1017         size_max = po->tx_ring.frame_size
1018                 - (po->tp_hdrlen - sizeof(struct sockaddr_ll));
1019
1020         if (size_max > dev->mtu + reserve)
1021                 size_max = dev->mtu + reserve;
1022
1023         do {
1024                 ph = packet_current_frame(po, &po->tx_ring,
1025                                 TP_STATUS_SEND_REQUEST);
1026
1027                 if (unlikely(ph == NULL)) {
1028                         schedule();
1029                         continue;
1030                 }
1031
1032                 status = TP_STATUS_SEND_REQUEST;
1033                 skb = sock_alloc_send_skb(&po->sk,
1034                                 LL_ALLOCATED_SPACE(dev)
1035                                 + sizeof(struct sockaddr_ll),
1036                                 0, &err);
1037
1038                 if (unlikely(skb == NULL))
1039                         goto out_status;
1040
1041                 tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
1042                                 addr);
1043
1044                 if (unlikely(tp_len < 0)) {
1045                         if (po->tp_loss) {
1046                                 __packet_set_status(po, ph,
1047                                                 TP_STATUS_AVAILABLE);
1048                                 packet_increment_head(&po->tx_ring);
1049                                 kfree_skb(skb);
1050                                 continue;
1051                         } else {
1052                                 status = TP_STATUS_WRONG_FORMAT;
1053                                 err = tp_len;
1054                                 goto out_status;
1055                         }
1056                 }
1057
1058                 skb->destructor = tpacket_destruct_skb;
1059                 __packet_set_status(po, ph, TP_STATUS_SENDING);
1060                 atomic_inc(&po->tx_ring.pending);
1061
1062                 status = TP_STATUS_SEND_REQUEST;
1063                 err = dev_queue_xmit(skb);
1064                 if (unlikely(err > 0)) {
1065                         err = net_xmit_errno(err);
1066                         if (err && __packet_get_status(po, ph) ==
1067                                    TP_STATUS_AVAILABLE) {
1068                                 /* skb was destructed already */
1069                                 skb = NULL;
1070                                 goto out_status;
1071                         }
1072                         /*
1073                          * skb was dropped but not destructed yet;
1074                          * let's treat it like congestion or err < 0
1075                          */
1076                         err = 0;
1077                 }
1078                 packet_increment_head(&po->tx_ring);
1079                 len_sum += tp_len;
1080         } while (likely((ph != NULL) ||
1081                         ((!(msg->msg_flags & MSG_DONTWAIT)) &&
1082                          (atomic_read(&po->tx_ring.pending))))
1083                 );
1084
1085         err = len_sum;
1086         goto out_put;
1087
1088 out_status:
1089         __packet_set_status(po, ph, status);
1090         kfree_skb(skb);
1091 out_put:
1092         if (need_rls_dev)
1093                 dev_put(dev);
1094 out:
1095         mutex_unlock(&po->pg_vec_lock);
1096         return err;
1097 }
1098
1099 static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
1100                                                size_t reserve, size_t len,
1101                                                size_t linear, int noblock,
1102                                                int *err)
1103 {
1104         struct sk_buff *skb;
1105
1106         /* Under a page?  Don't bother with paged skb. */
1107         if (prepad + len < PAGE_SIZE || !linear)
1108                 linear = len;
1109
1110         skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
1111                                    err);
1112         if (!skb)
1113                 return NULL;
1114
1115         skb_reserve(skb, reserve);
1116         skb_put(skb, linear);
1117         skb->data_len = len - linear;
1118         skb->len += len - linear;
1119
1120         return skb;
1121 }
1122
1123 static int packet_snd(struct socket *sock,
1124                           struct msghdr *msg, size_t len)
1125 {
1126         struct sock *sk = sock->sk;
1127         struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
1128         struct sk_buff *skb;
1129         struct net_device *dev;
1130         __be16 proto;
1131         bool need_rls_dev = false;
1132         unsigned char *addr;
1133         int err, reserve = 0;
1134         struct virtio_net_hdr vnet_hdr = { 0 };
1135         int offset = 0;
1136         int vnet_hdr_len;
1137         struct packet_sock *po = pkt_sk(sk);
1138         unsigned short gso_type = 0;
1139
1140         /*
1141          *      Get and verify the address.
1142          */
1143
1144         if (saddr == NULL) {
1145                 dev = po->prot_hook.dev;
1146                 proto   = po->num;
1147                 addr    = NULL;
1148         } else {
1149                 err = -EINVAL;
1150                 if (msg->msg_namelen < sizeof(struct sockaddr_ll))
1151                         goto out;
1152                 if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
1153                         goto out;
1154                 proto   = saddr->sll_protocol;
1155                 addr    = saddr->sll_addr;
1156                 dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
1157                 need_rls_dev = true;
1158         }
1159
1160         err = -ENXIO;
1161         if (dev == NULL)
1162                 goto out_unlock;
1163         if (sock->type == SOCK_RAW)
1164                 reserve = dev->hard_header_len;
1165
1166         err = -ENETDOWN;
1167         if (!(dev->flags & IFF_UP))
1168                 goto out_unlock;
1169
1170         if (po->has_vnet_hdr) {
1171                 vnet_hdr_len = sizeof(vnet_hdr);
1172
1173                 err = -EINVAL;
1174                 if (len < vnet_hdr_len)
1175                         goto out_unlock;
1176
1177                 len -= vnet_hdr_len;
1178
1179                 err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
1180                                        vnet_hdr_len);
1181                 if (err < 0)
1182                         goto out_unlock;
1183
1184                 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1185                     (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 >
1186                       vnet_hdr.hdr_len))
1187                         vnet_hdr.hdr_len = vnet_hdr.csum_start +
1188                                                  vnet_hdr.csum_offset + 2;
1189
1190                 err = -EINVAL;
1191                 if (vnet_hdr.hdr_len > len)
1192                         goto out_unlock;
1193
1194                 if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1195                         switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1196                         case VIRTIO_NET_HDR_GSO_TCPV4:
1197                                 gso_type = SKB_GSO_TCPV4;
1198                                 break;
1199                         case VIRTIO_NET_HDR_GSO_TCPV6:
1200                                 gso_type = SKB_GSO_TCPV6;
1201                                 break;
1202                         case VIRTIO_NET_HDR_GSO_UDP:
1203                                 gso_type = SKB_GSO_UDP;
1204                                 break;
1205                         default:
1206                                 goto out_unlock;
1207                         }
1208
1209                         if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
1210                                 gso_type |= SKB_GSO_TCP_ECN;
1211
1212                         if (vnet_hdr.gso_size == 0)
1213                                 goto out_unlock;
1214
1215                 }
1216         }
1217
1218         err = -EMSGSIZE;
1219         if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
1220                 goto out_unlock;
1221
1222         err = -ENOBUFS;
1223         skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
1224                                LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
1225                                msg->msg_flags & MSG_DONTWAIT, &err);
1226         if (skb == NULL)
1227                 goto out_unlock;
1228
1229         skb_set_network_header(skb, reserve);
1230
1231         err = -EINVAL;
1232         if (sock->type == SOCK_DGRAM &&
1233             (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
1234                 goto out_free;
1235
1236         /* Returns -EFAULT on error */
1237         err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
1238         if (err)
1239                 goto out_free;
1240         err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
1241         if (err < 0)
1242                 goto out_free;
1243
1244         if (!gso_type && (len > dev->mtu + reserve)) {
1245                 /* Earlier code assumed this would be a VLAN pkt,
1246                  * double-check this now that we have the actual
1247                  * packet in hand.
1248                  */
1249                 struct ethhdr *ehdr;
1250                 skb_reset_mac_header(skb);
1251                 ehdr = eth_hdr(skb);
1252                 if (ehdr->h_proto != htons(ETH_P_8021Q)) {
1253                         err = -EMSGSIZE;
1254                         goto out_free;
1255                 }
1256         }
1257
1258         skb->protocol = proto;
1259         skb->dev = dev;
1260         skb->priority = sk->sk_priority;
1261         skb->mark = sk->sk_mark;
1262
1263         if (po->has_vnet_hdr) {
1264                 if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1265                         if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
1266                                                   vnet_hdr.csum_offset)) {
1267                                 err = -EINVAL;
1268                                 goto out_free;
1269                         }
1270                 }
1271
1272                 skb_shinfo(skb)->gso_size = vnet_hdr.gso_size;
1273                 skb_shinfo(skb)->gso_type = gso_type;
1274
1275                 /* Header must be checked, and gso_segs computed. */
1276                 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
1277                 skb_shinfo(skb)->gso_segs = 0;
1278
1279                 len += vnet_hdr_len;
1280         }
1281
1282         /*
1283          *      Now send it
1284          */
1285
1286         err = dev_queue_xmit(skb);
1287         if (err > 0 && (err = net_xmit_errno(err)) != 0)
1288                 goto out_unlock;
1289
1290         if (need_rls_dev)
1291                 dev_put(dev);
1292
1293         return len;
1294
1295 out_free:
1296         kfree_skb(skb);
1297 out_unlock:
1298         if (dev && need_rls_dev)
1299                 dev_put(dev);
1300 out:
1301         return err;
1302 }
1303
1304 static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,
1305                 struct msghdr *msg, size_t len)
1306 {
1307         struct sock *sk = sock->sk;
1308         struct packet_sock *po = pkt_sk(sk);
1309         if (po->tx_ring.pg_vec)
1310                 return tpacket_snd(po, msg);
1311         else
1312                 return packet_snd(sock, msg, len);
1313 }
1314
1315 /*
1316  *      Close a PACKET socket. This is fairly simple. We immediately go
1317  *      to 'closed' state and remove our protocol entry in the device list.
1318  */
1319
1320 static int packet_release(struct socket *sock)
1321 {
1322         struct sock *sk = sock->sk;
1323         struct packet_sock *po;
1324         struct net *net;
1325         struct tpacket_req req;
1326
1327         if (!sk)
1328                 return 0;
1329
1330         net = sock_net(sk);
1331         po = pkt_sk(sk);
1332
1333         spin_lock_bh(&net->packet.sklist_lock);
1334         sk_del_node_init_rcu(sk);
1335         sock_prot_inuse_add(net, sk->sk_prot, -1);
1336         spin_unlock_bh(&net->packet.sklist_lock);
1337
1338         spin_lock(&po->bind_lock);
1339         if (po->running) {
1340                 /*
1341                  * Remove from protocol table
1342                  */
1343                 po->running = 0;
1344                 po->num = 0;
1345                 __dev_remove_pack(&po->prot_hook);
1346                 __sock_put(sk);
1347         }
1348         if (po->prot_hook.dev) {
1349                 dev_put(po->prot_hook.dev);
1350                 po->prot_hook.dev = NULL;
1351         }
1352         spin_unlock(&po->bind_lock);
1353
1354         packet_flush_mclist(sk);
1355
1356         memset(&req, 0, sizeof(req));
1357
1358         if (po->rx_ring.pg_vec)
1359                 packet_set_ring(sk, &req, 1, 0);
1360
1361         if (po->tx_ring.pg_vec)
1362                 packet_set_ring(sk, &req, 1, 1);
1363
1364         synchronize_net();
1365         /*
1366          *      Now the socket is dead. No more input will appear.
1367          */
1368         sock_orphan(sk);
1369         sock->sk = NULL;
1370
1371         /* Purge queues */
1372
1373         skb_queue_purge(&sk->sk_receive_queue);
1374         sk_refcnt_debug_release(sk);
1375
1376         sock_put(sk);
1377         return 0;
1378 }
1379
1380 /*
1381  *      Attach a packet hook.
1382  */
1383
1384 static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
1385 {
1386         struct packet_sock *po = pkt_sk(sk);
1387         /*
1388          *      Detach an existing hook if present.
1389          */
1390
1391         lock_sock(sk);
1392
1393         spin_lock(&po->bind_lock);
1394         if (po->running) {
1395                 __sock_put(sk);
1396                 po->running = 0;
1397                 po->num = 0;
1398                 spin_unlock(&po->bind_lock);
1399                 dev_remove_pack(&po->prot_hook);
1400                 spin_lock(&po->bind_lock);
1401         }
1402
1403         po->num = protocol;
1404         po->prot_hook.type = protocol;
1405         if (po->prot_hook.dev)
1406                 dev_put(po->prot_hook.dev);
1407         po->prot_hook.dev = dev;
1408
1409         po->ifindex = dev ? dev->ifindex : 0;
1410
1411         if (protocol == 0)
1412                 goto out_unlock;
1413
1414         if (!dev || (dev->flags & IFF_UP)) {
1415                 dev_add_pack(&po->prot_hook);
1416                 sock_hold(sk);
1417                 po->running = 1;
1418         } else {
1419                 sk->sk_err = ENETDOWN;
1420                 if (!sock_flag(sk, SOCK_DEAD))
1421                         sk->sk_error_report(sk);
1422         }
1423
1424 out_unlock:
1425         spin_unlock(&po->bind_lock);
1426         release_sock(sk);
1427         return 0;
1428 }
1429
1430 /*
1431  *      Bind a packet socket to a device
1432  */
1433
1434 static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr,
1435                             int addr_len)
1436 {
1437         struct sock *sk = sock->sk;
1438         char name[15];
1439         struct net_device *dev;
1440         int err = -ENODEV;
1441
1442         /*
1443          *      Check legality
1444          */
1445
1446         if (addr_len != sizeof(struct sockaddr))
1447                 return -EINVAL;
1448         strlcpy(name, uaddr->sa_data, sizeof(name));
1449
1450         dev = dev_get_by_name(sock_net(sk), name);
1451         if (dev)
1452                 err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
1453         return err;
1454 }
1455
1456 static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1457 {
1458         struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
1459         struct sock *sk = sock->sk;
1460         struct net_device *dev = NULL;
1461         int err;
1462
1463
1464         /*
1465          *      Check legality
1466          */
1467
1468         if (addr_len < sizeof(struct sockaddr_ll))
1469                 return -EINVAL;
1470         if (sll->sll_family != AF_PACKET)
1471                 return -EINVAL;
1472
1473         if (sll->sll_ifindex) {
1474                 err = -ENODEV;
1475                 dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
1476                 if (dev == NULL)
1477                         goto out;
1478         }
1479         err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
1480
1481 out:
1482         return err;
1483 }
1484
1485 static struct proto packet_proto = {
1486         .name     = "PACKET",
1487         .owner    = THIS_MODULE,
1488         .obj_size = sizeof(struct packet_sock),
1489 };
1490
1491 /*
1492  *      Create a packet of type SOCK_PACKET.
1493  */
1494
1495 static int packet_create(struct net *net, struct socket *sock, int protocol,
1496                          int kern)
1497 {
1498         struct sock *sk;
1499         struct packet_sock *po;
1500         __be16 proto = (__force __be16)protocol; /* weird, but documented */
1501         int err;
1502
1503         if (!capable(CAP_NET_RAW))
1504                 return -EPERM;
1505         if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW &&
1506             sock->type != SOCK_PACKET)
1507                 return -ESOCKTNOSUPPORT;
1508
1509         sock->state = SS_UNCONNECTED;
1510
1511         err = -ENOBUFS;
1512         sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto);
1513         if (sk == NULL)
1514                 goto out;
1515
1516         sock->ops = &packet_ops;
1517         if (sock->type == SOCK_PACKET)
1518                 sock->ops = &packet_ops_spkt;
1519
1520         sock_init_data(sock, sk);
1521
1522         po = pkt_sk(sk);
1523         sk->sk_family = PF_PACKET;
1524         po->num = proto;
1525
1526         sk->sk_destruct = packet_sock_destruct;
1527         sk_refcnt_debug_inc(sk);
1528
1529         /*
1530          *      Attach a protocol block
1531          */
1532
1533         spin_lock_init(&po->bind_lock);
1534         mutex_init(&po->pg_vec_lock);
1535         po->prot_hook.func = packet_rcv;
1536
1537         if (sock->type == SOCK_PACKET)
1538                 po->prot_hook.func = packet_rcv_spkt;
1539
1540         po->prot_hook.af_packet_priv = sk;
1541
1542         if (proto) {
1543                 po->prot_hook.type = proto;
1544                 dev_add_pack(&po->prot_hook);
1545                 sock_hold(sk);
1546                 po->running = 1;
1547         }
1548
1549         spin_lock_bh(&net->packet.sklist_lock);
1550         sk_add_node_rcu(sk, &net->packet.sklist);
1551         sock_prot_inuse_add(net, &packet_proto, 1);
1552         spin_unlock_bh(&net->packet.sklist_lock);
1553
1554         return 0;
1555 out:
1556         return err;
1557 }
1558
1559 static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len)
1560 {
1561         struct sock_exterr_skb *serr;
1562         struct sk_buff *skb, *skb2;
1563         int copied, err;
1564
1565         err = -EAGAIN;
1566         skb = skb_dequeue(&sk->sk_error_queue);
1567         if (skb == NULL)
1568                 goto out;
1569
1570         copied = skb->len;
1571         if (copied > len) {
1572                 msg->msg_flags |= MSG_TRUNC;
1573                 copied = len;
1574         }
1575         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1576         if (err)
1577                 goto out_free_skb;
1578
1579         sock_recv_timestamp(msg, sk, skb);
1580
1581         serr = SKB_EXT_ERR(skb);
1582         put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP,
1583                  sizeof(serr->ee), &serr->ee);
1584
1585         msg->msg_flags |= MSG_ERRQUEUE;
1586         err = copied;
1587
1588         /* Reset and regenerate socket error */
1589         spin_lock_bh(&sk->sk_error_queue.lock);
1590         sk->sk_err = 0;
1591         if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
1592                 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
1593                 spin_unlock_bh(&sk->sk_error_queue.lock);
1594                 sk->sk_error_report(sk);
1595         } else
1596                 spin_unlock_bh(&sk->sk_error_queue.lock);
1597
1598 out_free_skb:
1599         kfree_skb(skb);
1600 out:
1601         return err;
1602 }
1603
1604 /*
1605  *      Pull a packet from our receive queue and hand it to the user.
1606  *      If necessary we block.
1607  */
1608
1609 static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
1610                           struct msghdr *msg, size_t len, int flags)
1611 {
1612         struct sock *sk = sock->sk;
1613         struct sk_buff *skb;
1614         int copied, err;
1615         struct sockaddr_ll *sll;
1616         int vnet_hdr_len = 0;
1617
1618         err = -EINVAL;
1619         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
1620                 goto out;
1621
1622 #if 0
1623         /* What error should we return now? EUNATTACH? */
1624         if (pkt_sk(sk)->ifindex < 0)
1625                 return -ENODEV;
1626 #endif
1627
1628         if (flags & MSG_ERRQUEUE) {
1629                 err = packet_recv_error(sk, msg, len);
1630                 goto out;
1631         }
1632
1633         /*
1634          *      Call the generic datagram receiver. This handles all sorts
1635          *      of horrible races and re-entrancy so we can forget about it
1636          *      in the protocol layers.
1637          *
1638          *      Now it will return ENETDOWN, if device have just gone down,
1639          *      but then it will block.
1640          */
1641
1642         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
1643
1644         /*
1645          *      An error occurred so return it. Because skb_recv_datagram()
1646          *      handles the blocking we don't see and worry about blocking
1647          *      retries.
1648          */
1649
1650         if (skb == NULL)
1651                 goto out;
1652
1653         if (pkt_sk(sk)->has_vnet_hdr) {
1654                 struct virtio_net_hdr vnet_hdr = { 0 };
1655
1656                 err = -EINVAL;
1657                 vnet_hdr_len = sizeof(vnet_hdr);
1658                 if (len < vnet_hdr_len)
1659                         goto out_free;
1660
1661                 len -= vnet_hdr_len;
1662
1663                 if (skb_is_gso(skb)) {
1664                         struct skb_shared_info *sinfo = skb_shinfo(skb);
1665
1666                         /* This is a hint as to how much should be linear. */
1667                         vnet_hdr.hdr_len = skb_headlen(skb);
1668                         vnet_hdr.gso_size = sinfo->gso_size;
1669                         if (sinfo->gso_type & SKB_GSO_TCPV4)
1670                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1671                         else if (sinfo->gso_type & SKB_GSO_TCPV6)
1672                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1673                         else if (sinfo->gso_type & SKB_GSO_UDP)
1674                                 vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
1675                         else if (sinfo->gso_type & SKB_GSO_FCOE)
1676                                 goto out_free;
1677                         else
1678                                 BUG();
1679                         if (sinfo->gso_type & SKB_GSO_TCP_ECN)
1680                                 vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1681                 } else
1682                         vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
1683
1684                 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1685                         vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
1686                         vnet_hdr.csum_start = skb_checksum_start_offset(skb);
1687                         vnet_hdr.csum_offset = skb->csum_offset;
1688                 } /* else everything is zero */
1689
1690                 err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
1691                                      vnet_hdr_len);
1692                 if (err < 0)
1693                         goto out_free;
1694         }
1695
1696         /*
1697          *      If the address length field is there to be filled in, we fill
1698          *      it in now.
1699          */
1700
1701         sll = &PACKET_SKB_CB(skb)->sa.ll;
1702         if (sock->type == SOCK_PACKET)
1703                 msg->msg_namelen = sizeof(struct sockaddr_pkt);
1704         else
1705                 msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr);
1706
1707         /*
1708          *      You lose any data beyond the buffer you gave. If it worries a
1709          *      user program they can ask the device for its MTU anyway.
1710          */
1711
1712         copied = skb->len;
1713         if (copied > len) {
1714                 copied = len;
1715                 msg->msg_flags |= MSG_TRUNC;
1716         }
1717
1718         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1719         if (err)
1720                 goto out_free;
1721
1722         sock_recv_ts_and_drops(msg, sk, skb);
1723
1724         if (msg->msg_name)
1725                 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
1726                        msg->msg_namelen);
1727
1728         if (pkt_sk(sk)->auxdata) {
1729                 struct tpacket_auxdata aux;
1730
1731                 aux.tp_status = TP_STATUS_USER;
1732                 if (skb->ip_summed == CHECKSUM_PARTIAL)
1733                         aux.tp_status |= TP_STATUS_CSUMNOTREADY;
1734                 aux.tp_len = PACKET_SKB_CB(skb)->origlen;
1735                 aux.tp_snaplen = skb->len;
1736                 aux.tp_mac = 0;
1737                 aux.tp_net = skb_network_offset(skb);
1738                 if (vlan_tx_tag_present(skb)) {
1739                         aux.tp_vlan_tci = vlan_tx_tag_get(skb);
1740                         aux.tp_status |= TP_STATUS_VLAN_VALID;
1741                 } else {
1742                         aux.tp_vlan_tci = 0;
1743                 }
1744                 put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
1745         }
1746
1747         /*
1748          *      Free or return the buffer as appropriate. Again this
1749          *      hides all the races and re-entrancy issues from us.
1750          */
1751         err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied);
1752
1753 out_free:
1754         skb_free_datagram(sk, skb);
1755 out:
1756         return err;
1757 }
1758
1759 static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
1760                                int *uaddr_len, int peer)
1761 {
1762         struct net_device *dev;
1763         struct sock *sk = sock->sk;
1764
1765         if (peer)
1766                 return -EOPNOTSUPP;
1767
1768         uaddr->sa_family = AF_PACKET;
1769         rcu_read_lock();
1770         dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
1771         if (dev)
1772                 strncpy(uaddr->sa_data, dev->name, 14);
1773         else
1774                 memset(uaddr->sa_data, 0, 14);
1775         rcu_read_unlock();
1776         *uaddr_len = sizeof(*uaddr);
1777
1778         return 0;
1779 }
1780
1781 static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
1782                           int *uaddr_len, int peer)
1783 {
1784         struct net_device *dev;
1785         struct sock *sk = sock->sk;
1786         struct packet_sock *po = pkt_sk(sk);
1787         DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
1788
1789         if (peer)
1790                 return -EOPNOTSUPP;
1791
1792         sll->sll_family = AF_PACKET;
1793         sll->sll_ifindex = po->ifindex;
1794         sll->sll_protocol = po->num;
1795         sll->sll_pkttype = 0;
1796         rcu_read_lock();
1797         dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
1798         if (dev) {
1799                 sll->sll_hatype = dev->type;
1800                 sll->sll_halen = dev->addr_len;
1801                 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1802         } else {
1803                 sll->sll_hatype = 0;    /* Bad: we have no ARPHRD_UNSPEC */
1804                 sll->sll_halen = 0;
1805         }
1806         rcu_read_unlock();
1807         *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen;
1808
1809         return 0;
1810 }
1811
1812 static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
1813                          int what)
1814 {
1815         switch (i->type) {
1816         case PACKET_MR_MULTICAST:
1817                 if (i->alen != dev->addr_len)
1818                         return -EINVAL;
1819                 if (what > 0)
1820                         return dev_mc_add(dev, i->addr);
1821                 else
1822                         return dev_mc_del(dev, i->addr);
1823                 break;
1824         case PACKET_MR_PROMISC:
1825                 return dev_set_promiscuity(dev, what);
1826                 break;
1827         case PACKET_MR_ALLMULTI:
1828                 return dev_set_allmulti(dev, what);
1829                 break;
1830         case PACKET_MR_UNICAST:
1831                 if (i->alen != dev->addr_len)
1832                         return -EINVAL;
1833                 if (what > 0)
1834                         return dev_uc_add(dev, i->addr);
1835                 else
1836                         return dev_uc_del(dev, i->addr);
1837                 break;
1838         default:
1839                 break;
1840         }
1841         return 0;
1842 }
1843
1844 static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
1845 {
1846         for ( ; i; i = i->next) {
1847                 if (i->ifindex == dev->ifindex)
1848                         packet_dev_mc(dev, i, what);
1849         }
1850 }
1851
1852 static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
1853 {
1854         struct packet_sock *po = pkt_sk(sk);
1855         struct packet_mclist *ml, *i;
1856         struct net_device *dev;
1857         int err;
1858
1859         rtnl_lock();
1860
1861         err = -ENODEV;
1862         dev = __dev_get_by_index(sock_net(sk), mreq->mr_ifindex);
1863         if (!dev)
1864                 goto done;
1865
1866         err = -EINVAL;
1867         if (mreq->mr_alen > dev->addr_len)
1868                 goto done;
1869
1870         err = -ENOBUFS;
1871         i = kmalloc(sizeof(*i), GFP_KERNEL);
1872         if (i == NULL)
1873                 goto done;
1874
1875         err = 0;
1876         for (ml = po->mclist; ml; ml = ml->next) {
1877                 if (ml->ifindex == mreq->mr_ifindex &&
1878                     ml->type == mreq->mr_type &&
1879                     ml->alen == mreq->mr_alen &&
1880                     memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1881                         ml->count++;
1882                         /* Free the new element ... */
1883                         kfree(i);
1884                         goto done;
1885                 }
1886         }
1887
1888         i->type = mreq->mr_type;
1889         i->ifindex = mreq->mr_ifindex;
1890         i->alen = mreq->mr_alen;
1891         memcpy(i->addr, mreq->mr_address, i->alen);
1892         i->count = 1;
1893         i->next = po->mclist;
1894         po->mclist = i;
1895         err = packet_dev_mc(dev, i, 1);
1896         if (err) {
1897                 po->mclist = i->next;
1898                 kfree(i);
1899         }
1900
1901 done:
1902         rtnl_unlock();
1903         return err;
1904 }
1905
1906 static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
1907 {
1908         struct packet_mclist *ml, **mlp;
1909
1910         rtnl_lock();
1911
1912         for (mlp = &pkt_sk(sk)->mclist; (ml = *mlp) != NULL; mlp = &ml->next) {
1913                 if (ml->ifindex == mreq->mr_ifindex &&
1914                     ml->type == mreq->mr_type &&
1915                     ml->alen == mreq->mr_alen &&
1916                     memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) {
1917                         if (--ml->count == 0) {
1918                                 struct net_device *dev;
1919                                 *mlp = ml->next;
1920                                 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1921                                 if (dev)
1922                                         packet_dev_mc(dev, ml, -1);
1923                                 kfree(ml);
1924                         }
1925                         rtnl_unlock();
1926                         return 0;
1927                 }
1928         }
1929         rtnl_unlock();
1930         return -EADDRNOTAVAIL;
1931 }
1932
1933 static void packet_flush_mclist(struct sock *sk)
1934 {
1935         struct packet_sock *po = pkt_sk(sk);
1936         struct packet_mclist *ml;
1937
1938         if (!po->mclist)
1939                 return;
1940
1941         rtnl_lock();
1942         while ((ml = po->mclist) != NULL) {
1943                 struct net_device *dev;
1944
1945                 po->mclist = ml->next;
1946                 dev = __dev_get_by_index(sock_net(sk), ml->ifindex);
1947                 if (dev != NULL)
1948                         packet_dev_mc(dev, ml, -1);
1949                 kfree(ml);
1950         }
1951         rtnl_unlock();
1952 }
1953
1954 static int
1955 packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1956 {
1957         struct sock *sk = sock->sk;
1958         struct packet_sock *po = pkt_sk(sk);
1959         int ret;
1960
1961         if (level != SOL_PACKET)
1962                 return -ENOPROTOOPT;
1963
1964         switch (optname) {
1965         case PACKET_ADD_MEMBERSHIP:
1966         case PACKET_DROP_MEMBERSHIP:
1967         {
1968                 struct packet_mreq_max mreq;
1969                 int len = optlen;
1970                 memset(&mreq, 0, sizeof(mreq));
1971                 if (len < sizeof(struct packet_mreq))
1972                         return -EINVAL;
1973                 if (len > sizeof(mreq))
1974                         len = sizeof(mreq);
1975                 if (copy_from_user(&mreq, optval, len))
1976                         return -EFAULT;
1977                 if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address)))
1978                         return -EINVAL;
1979                 if (optname == PACKET_ADD_MEMBERSHIP)
1980                         ret = packet_mc_add(sk, &mreq);
1981                 else
1982                         ret = packet_mc_drop(sk, &mreq);
1983                 return ret;
1984         }
1985
1986         case PACKET_RX_RING:
1987         case PACKET_TX_RING:
1988         {
1989                 struct tpacket_req req;
1990
1991                 if (optlen < sizeof(req))
1992                         return -EINVAL;
1993                 if (pkt_sk(sk)->has_vnet_hdr)
1994                         return -EINVAL;
1995                 if (copy_from_user(&req, optval, sizeof(req)))
1996                         return -EFAULT;
1997                 return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING);
1998         }
1999         case PACKET_COPY_THRESH:
2000         {
2001                 int val;
2002
2003                 if (optlen != sizeof(val))
2004                         return -EINVAL;
2005                 if (copy_from_user(&val, optval, sizeof(val)))
2006                         return -EFAULT;
2007
2008                 pkt_sk(sk)->copy_thresh = val;
2009                 return 0;
2010         }
2011         case PACKET_VERSION:
2012         {
2013                 int val;
2014
2015                 if (optlen != sizeof(val))
2016                         return -EINVAL;
2017                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2018                         return -EBUSY;
2019                 if (copy_from_user(&val, optval, sizeof(val)))
2020                         return -EFAULT;
2021                 switch (val) {
2022                 case TPACKET_V1:
2023                 case TPACKET_V2:
2024                         po->tp_version = val;
2025                         return 0;
2026                 default:
2027                         return -EINVAL;
2028                 }
2029         }
2030         case PACKET_RESERVE:
2031         {
2032                 unsigned int val;
2033
2034                 if (optlen != sizeof(val))
2035                         return -EINVAL;
2036                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2037                         return -EBUSY;
2038                 if (copy_from_user(&val, optval, sizeof(val)))
2039                         return -EFAULT;
2040                 po->tp_reserve = val;
2041                 return 0;
2042         }
2043         case PACKET_LOSS:
2044         {
2045                 unsigned int val;
2046
2047                 if (optlen != sizeof(val))
2048                         return -EINVAL;
2049                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2050                         return -EBUSY;
2051                 if (copy_from_user(&val, optval, sizeof(val)))
2052                         return -EFAULT;
2053                 po->tp_loss = !!val;
2054                 return 0;
2055         }
2056         case PACKET_AUXDATA:
2057         {
2058                 int val;
2059
2060                 if (optlen < sizeof(val))
2061                         return -EINVAL;
2062                 if (copy_from_user(&val, optval, sizeof(val)))
2063                         return -EFAULT;
2064
2065                 po->auxdata = !!val;
2066                 return 0;
2067         }
2068         case PACKET_ORIGDEV:
2069         {
2070                 int val;
2071
2072                 if (optlen < sizeof(val))
2073                         return -EINVAL;
2074                 if (copy_from_user(&val, optval, sizeof(val)))
2075                         return -EFAULT;
2076
2077                 po->origdev = !!val;
2078                 return 0;
2079         }
2080         case PACKET_VNET_HDR:
2081         {
2082                 int val;
2083
2084                 if (sock->type != SOCK_RAW)
2085                         return -EINVAL;
2086                 if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
2087                         return -EBUSY;
2088                 if (optlen < sizeof(val))
2089                         return -EINVAL;
2090                 if (copy_from_user(&val, optval, sizeof(val)))
2091                         return -EFAULT;
2092
2093                 po->has_vnet_hdr = !!val;
2094                 return 0;
2095         }
2096         case PACKET_TIMESTAMP:
2097         {
2098                 int val;
2099
2100                 if (optlen != sizeof(val))
2101                         return -EINVAL;
2102                 if (copy_from_user(&val, optval, sizeof(val)))
2103                         return -EFAULT;
2104
2105                 po->tp_tstamp = val;
2106                 return 0;
2107         }
2108         default:
2109                 return -ENOPROTOOPT;
2110         }
2111 }
2112
2113 static int packet_getsockopt(struct socket *sock, int level, int optname,
2114                              char __user *optval, int __user *optlen)
2115 {
2116         int len;
2117         int val;
2118         struct sock *sk = sock->sk;
2119         struct packet_sock *po = pkt_sk(sk);
2120         void *data;
2121         struct tpacket_stats st;
2122
2123         if (level != SOL_PACKET)
2124                 return -ENOPROTOOPT;
2125
2126         if (get_user(len, optlen))
2127                 return -EFAULT;
2128
2129         if (len < 0)
2130                 return -EINVAL;
2131
2132         switch (optname) {
2133         case PACKET_STATISTICS:
2134                 if (len > sizeof(struct tpacket_stats))
2135                         len = sizeof(struct tpacket_stats);
2136                 spin_lock_bh(&sk->sk_receive_queue.lock);
2137                 st = po->stats;
2138                 memset(&po->stats, 0, sizeof(st));
2139                 spin_unlock_bh(&sk->sk_receive_queue.lock);
2140                 st.tp_packets += st.tp_drops;
2141
2142                 data = &st;
2143                 break;
2144         case PACKET_AUXDATA:
2145                 if (len > sizeof(int))
2146                         len = sizeof(int);
2147                 val = po->auxdata;
2148
2149                 data = &val;
2150                 break;
2151         case PACKET_ORIGDEV:
2152                 if (len > sizeof(int))
2153                         len = sizeof(int);
2154                 val = po->origdev;
2155
2156                 data = &val;
2157                 break;
2158         case PACKET_VNET_HDR:
2159                 if (len > sizeof(int))
2160                         len = sizeof(int);
2161                 val = po->has_vnet_hdr;
2162
2163                 data = &val;
2164                 break;
2165         case PACKET_VERSION:
2166                 if (len > sizeof(int))
2167                         len = sizeof(int);
2168                 val = po->tp_version;
2169                 data = &val;
2170                 break;
2171         case PACKET_HDRLEN:
2172                 if (len > sizeof(int))
2173                         len = sizeof(int);
2174                 if (copy_from_user(&val, optval, len))
2175                         return -EFAULT;
2176                 switch (val) {
2177                 case TPACKET_V1:
2178                         val = sizeof(struct tpacket_hdr);
2179                         break;
2180                 case TPACKET_V2:
2181                         val = sizeof(struct tpacket2_hdr);
2182                         break;
2183                 default:
2184                         return -EINVAL;
2185                 }
2186                 data = &val;
2187                 break;
2188         case PACKET_RESERVE:
2189                 if (len > sizeof(unsigned int))
2190                         len = sizeof(unsigned int);
2191                 val = po->tp_reserve;
2192                 data = &val;
2193                 break;
2194         case PACKET_LOSS:
2195                 if (len > sizeof(unsigned int))
2196                         len = sizeof(unsigned int);
2197                 val = po->tp_loss;
2198                 data = &val;
2199                 break;
2200         case PACKET_TIMESTAMP:
2201                 if (len > sizeof(int))
2202                         len = sizeof(int);
2203                 val = po->tp_tstamp;
2204                 data = &val;
2205                 break;
2206         default:
2207                 return -ENOPROTOOPT;
2208         }
2209
2210         if (put_user(len, optlen))
2211                 return -EFAULT;
2212         if (copy_to_user(optval, data, len))
2213                 return -EFAULT;
2214         return 0;
2215 }
2216
2217
2218 static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data)
2219 {
2220         struct sock *sk;
2221         struct hlist_node *node;
2222         struct net_device *dev = data;
2223         struct net *net = dev_net(dev);
2224
2225         rcu_read_lock();
2226         sk_for_each_rcu(sk, node, &net->packet.sklist) {
2227                 struct packet_sock *po = pkt_sk(sk);
2228
2229                 switch (msg) {
2230                 case NETDEV_UNREGISTER:
2231                         if (po->mclist)
2232                                 packet_dev_mclist(dev, po->mclist, -1);
2233                         /* fallthrough */
2234
2235                 case NETDEV_DOWN:
2236                         if (dev->ifindex == po->ifindex) {
2237                                 spin_lock(&po->bind_lock);
2238                                 if (po->running) {
2239                                         __dev_remove_pack(&po->prot_hook);
2240                                         __sock_put(sk);
2241                                         po->running = 0;
2242                                         sk->sk_err = ENETDOWN;
2243                                         if (!sock_flag(sk, SOCK_DEAD))
2244                                                 sk->sk_error_report(sk);
2245                                 }
2246                                 if (msg == NETDEV_UNREGISTER) {
2247                                         po->ifindex = -1;
2248                                         if (po->prot_hook.dev)
2249                                                 dev_put(po->prot_hook.dev);
2250                                         po->prot_hook.dev = NULL;
2251                                 }
2252                                 spin_unlock(&po->bind_lock);
2253                         }
2254                         break;
2255                 case NETDEV_UP:
2256                         if (dev->ifindex == po->ifindex) {
2257                                 spin_lock(&po->bind_lock);
2258                                 if (po->num && !po->running) {
2259                                         dev_add_pack(&po->prot_hook);
2260                                         sock_hold(sk);
2261                                         po->running = 1;
2262                                 }
2263                                 spin_unlock(&po->bind_lock);
2264                         }
2265                         break;
2266                 }
2267         }
2268         rcu_read_unlock();
2269         return NOTIFY_DONE;
2270 }
2271
2272
2273 static int packet_ioctl(struct socket *sock, unsigned int cmd,
2274                         unsigned long arg)
2275 {
2276         struct sock *sk = sock->sk;
2277
2278         switch (cmd) {
2279         case SIOCOUTQ:
2280         {
2281                 int amount = sk_wmem_alloc_get(sk);
2282
2283                 return put_user(amount, (int __user *)arg);
2284         }
2285         case SIOCINQ:
2286         {
2287                 struct sk_buff *skb;
2288                 int amount = 0;
2289
2290                 spin_lock_bh(&sk->sk_receive_queue.lock);
2291                 skb = skb_peek(&sk->sk_receive_queue);
2292                 if (skb)
2293                         amount = skb->len;
2294                 spin_unlock_bh(&sk->sk_receive_queue.lock);
2295                 return put_user(amount, (int __user *)arg);
2296         }
2297         case SIOCGSTAMP:
2298                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
2299         case SIOCGSTAMPNS:
2300                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
2301
2302 #ifdef CONFIG_INET
2303         case SIOCADDRT:
2304         case SIOCDELRT:
2305         case SIOCDARP:
2306         case SIOCGARP:
2307         case SIOCSARP:
2308         case SIOCGIFADDR:
2309         case SIOCSIFADDR:
2310         case SIOCGIFBRDADDR:
2311         case SIOCSIFBRDADDR:
2312         case SIOCGIFNETMASK:
2313         case SIOCSIFNETMASK:
2314         case SIOCGIFDSTADDR:
2315         case SIOCSIFDSTADDR:
2316         case SIOCSIFFLAGS:
2317                 return inet_dgram_ops.ioctl(sock, cmd, arg);
2318 #endif
2319
2320         default:
2321                 return -ENOIOCTLCMD;
2322         }
2323         return 0;
2324 }
2325
2326 static unsigned int packet_poll(struct file *file, struct socket *sock,
2327                                 poll_table *wait)
2328 {
2329         struct sock *sk = sock->sk;
2330         struct packet_sock *po = pkt_sk(sk);
2331         unsigned int mask = datagram_poll(file, sock, wait);
2332
2333         spin_lock_bh(&sk->sk_receive_queue.lock);
2334         if (po->rx_ring.pg_vec) {
2335                 if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL))
2336                         mask |= POLLIN | POLLRDNORM;
2337         }
2338         spin_unlock_bh(&sk->sk_receive_queue.lock);
2339         spin_lock_bh(&sk->sk_write_queue.lock);
2340         if (po->tx_ring.pg_vec) {
2341                 if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE))
2342                         mask |= POLLOUT | POLLWRNORM;
2343         }
2344         spin_unlock_bh(&sk->sk_write_queue.lock);
2345         return mask;
2346 }
2347
2348
2349 /* Dirty? Well, I still did not learn better way to account
2350  * for user mmaps.
2351  */
2352
2353 static void packet_mm_open(struct vm_area_struct *vma)
2354 {
2355         struct file *file = vma->vm_file;
2356         struct socket *sock = file->private_data;
2357         struct sock *sk = sock->sk;
2358
2359         if (sk)
2360                 atomic_inc(&pkt_sk(sk)->mapped);
2361 }
2362
2363 static void packet_mm_close(struct vm_area_struct *vma)
2364 {
2365         struct file *file = vma->vm_file;
2366         struct socket *sock = file->private_data;
2367         struct sock *sk = sock->sk;
2368
2369         if (sk)
2370                 atomic_dec(&pkt_sk(sk)->mapped);
2371 }
2372
2373 static const struct vm_operations_struct packet_mmap_ops = {
2374         .open   =       packet_mm_open,
2375         .close  =       packet_mm_close,
2376 };
2377
2378 static void free_pg_vec(struct pgv *pg_vec, unsigned int order,
2379                         unsigned int len)
2380 {
2381         int i;
2382
2383         for (i = 0; i < len; i++) {
2384                 if (likely(pg_vec[i].buffer)) {
2385                         if (is_vmalloc_addr(pg_vec[i].buffer))
2386                                 vfree(pg_vec[i].buffer);
2387                         else
2388                                 free_pages((unsigned long)pg_vec[i].buffer,
2389                                            order);
2390                         pg_vec[i].buffer = NULL;
2391                 }
2392         }
2393         kfree(pg_vec);
2394 }
2395
2396 static inline char *alloc_one_pg_vec_page(unsigned long order)
2397 {
2398         char *buffer = NULL;
2399         gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP |
2400                           __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY;
2401
2402         buffer = (char *) __get_free_pages(gfp_flags, order);
2403
2404         if (buffer)
2405                 return buffer;
2406
2407         /*
2408          * __get_free_pages failed, fall back to vmalloc
2409          */
2410         buffer = vzalloc((1 << order) * PAGE_SIZE);
2411
2412         if (buffer)
2413                 return buffer;
2414
2415         /*
2416          * vmalloc failed, lets dig into swap here
2417          */
2418         gfp_flags &= ~__GFP_NORETRY;
2419         buffer = (char *)__get_free_pages(gfp_flags, order);
2420         if (buffer)
2421                 return buffer;
2422
2423         /*
2424          * complete and utter failure
2425          */
2426         return NULL;
2427 }
2428
2429 static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
2430 {
2431         unsigned int block_nr = req->tp_block_nr;
2432         struct pgv *pg_vec;
2433         int i;
2434
2435         pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL);
2436         if (unlikely(!pg_vec))
2437                 goto out;
2438
2439         for (i = 0; i < block_nr; i++) {
2440                 pg_vec[i].buffer = alloc_one_pg_vec_page(order);
2441                 if (unlikely(!pg_vec[i].buffer))
2442                         goto out_free_pgvec;
2443         }
2444
2445 out:
2446         return pg_vec;
2447
2448 out_free_pgvec:
2449         free_pg_vec(pg_vec, order, block_nr);
2450         pg_vec = NULL;
2451         goto out;
2452 }
2453
2454 static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
2455                 int closing, int tx_ring)
2456 {
2457         struct pgv *pg_vec = NULL;
2458         struct packet_sock *po = pkt_sk(sk);
2459         int was_running, order = 0;
2460         struct packet_ring_buffer *rb;
2461         struct sk_buff_head *rb_queue;
2462         __be16 num;
2463         int err;
2464
2465         rb = tx_ring ? &po->tx_ring : &po->rx_ring;
2466         rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
2467
2468         err = -EBUSY;
2469         if (!closing) {
2470                 if (atomic_read(&po->mapped))
2471                         goto out;
2472                 if (atomic_read(&rb->pending))
2473                         goto out;
2474         }
2475
2476         if (req->tp_block_nr) {
2477                 /* Sanity tests and some calculations */
2478                 err = -EBUSY;
2479                 if (unlikely(rb->pg_vec))
2480                         goto out;
2481
2482                 switch (po->tp_version) {
2483                 case TPACKET_V1:
2484                         po->tp_hdrlen = TPACKET_HDRLEN;
2485                         break;
2486                 case TPACKET_V2:
2487                         po->tp_hdrlen = TPACKET2_HDRLEN;
2488                         break;
2489                 }
2490
2491                 err = -EINVAL;
2492                 if (unlikely((int)req->tp_block_size <= 0))
2493                         goto out;
2494                 if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
2495                         goto out;
2496                 if (unlikely(req->tp_frame_size < po->tp_hdrlen +
2497                                         po->tp_reserve))
2498                         goto out;
2499                 if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1)))
2500                         goto out;
2501
2502                 rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
2503                 if (unlikely(rb->frames_per_block <= 0))
2504                         goto out;
2505                 if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
2506                                         req->tp_frame_nr))
2507                         goto out;
2508
2509                 err = -ENOMEM;
2510                 order = get_order(req->tp_block_size);
2511                 pg_vec = alloc_pg_vec(req, order);
2512                 if (unlikely(!pg_vec))
2513                         goto out;
2514         }
2515         /* Done */
2516         else {
2517                 err = -EINVAL;
2518                 if (unlikely(req->tp_frame_nr))
2519                         goto out;
2520         }
2521
2522         lock_sock(sk);
2523
2524         /* Detach socket from network */
2525         spin_lock(&po->bind_lock);
2526         was_running = po->running;
2527         num = po->num;
2528         if (was_running) {
2529                 __dev_remove_pack(&po->prot_hook);
2530                 po->num = 0;
2531                 po->running = 0;
2532                 __sock_put(sk);
2533         }
2534         spin_unlock(&po->bind_lock);
2535
2536         synchronize_net();
2537
2538         err = -EBUSY;
2539         mutex_lock(&po->pg_vec_lock);
2540         if (closing || atomic_read(&po->mapped) == 0) {
2541                 err = 0;
2542                 spin_lock_bh(&rb_queue->lock);
2543                 swap(rb->pg_vec, pg_vec);
2544                 rb->frame_max = (req->tp_frame_nr - 1);
2545                 rb->head = 0;
2546                 rb->frame_size = req->tp_frame_size;
2547                 spin_unlock_bh(&rb_queue->lock);
2548
2549                 swap(rb->pg_vec_order, order);
2550                 swap(rb->pg_vec_len, req->tp_block_nr);
2551
2552                 rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE;
2553                 po->prot_hook.func = (po->rx_ring.pg_vec) ?
2554                                                 tpacket_rcv : packet_rcv;
2555                 skb_queue_purge(rb_queue);
2556                 if (atomic_read(&po->mapped))
2557                         pr_err("packet_mmap: vma is busy: %d\n",
2558                                atomic_read(&po->mapped));
2559         }
2560         mutex_unlock(&po->pg_vec_lock);
2561
2562         spin_lock(&po->bind_lock);
2563         if (was_running && !po->running) {
2564                 sock_hold(sk);
2565                 po->running = 1;
2566                 po->num = num;
2567                 dev_add_pack(&po->prot_hook);
2568         }
2569         spin_unlock(&po->bind_lock);
2570
2571         release_sock(sk);
2572
2573         if (pg_vec)
2574                 free_pg_vec(pg_vec, order, req->tp_block_nr);
2575 out:
2576         return err;
2577 }
2578
2579 static int packet_mmap(struct file *file, struct socket *sock,
2580                 struct vm_area_struct *vma)
2581 {
2582         struct sock *sk = sock->sk;
2583         struct packet_sock *po = pkt_sk(sk);
2584         unsigned long size, expected_size;
2585         struct packet_ring_buffer *rb;
2586         unsigned long start;
2587         int err = -EINVAL;
2588         int i;
2589
2590         if (vma->vm_pgoff)
2591                 return -EINVAL;
2592
2593         mutex_lock(&po->pg_vec_lock);
2594
2595         expected_size = 0;
2596         for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2597                 if (rb->pg_vec) {
2598                         expected_size += rb->pg_vec_len
2599                                                 * rb->pg_vec_pages
2600                                                 * PAGE_SIZE;
2601                 }
2602         }
2603
2604         if (expected_size == 0)
2605                 goto out;
2606
2607         size = vma->vm_end - vma->vm_start;
2608         if (size != expected_size)
2609                 goto out;
2610
2611         start = vma->vm_start;
2612         for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) {
2613                 if (rb->pg_vec == NULL)
2614                         continue;
2615
2616                 for (i = 0; i < rb->pg_vec_len; i++) {
2617                         struct page *page;
2618                         void *kaddr = rb->pg_vec[i].buffer;
2619                         int pg_num;
2620
2621                         for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) {
2622                                 page = pgv_to_page(kaddr);
2623                                 err = vm_insert_page(vma, start, page);
2624                                 if (unlikely(err))
2625                                         goto out;
2626                                 start += PAGE_SIZE;
2627                                 kaddr += PAGE_SIZE;
2628                         }
2629                 }
2630         }
2631
2632         atomic_inc(&po->mapped);
2633         vma->vm_ops = &packet_mmap_ops;
2634         err = 0;
2635
2636 out:
2637         mutex_unlock(&po->pg_vec_lock);
2638         return err;
2639 }
2640
2641 static const struct proto_ops packet_ops_spkt = {
2642         .family =       PF_PACKET,
2643         .owner =        THIS_MODULE,
2644         .release =      packet_release,
2645         .bind =         packet_bind_spkt,
2646         .connect =      sock_no_connect,
2647         .socketpair =   sock_no_socketpair,
2648         .accept =       sock_no_accept,
2649         .getname =      packet_getname_spkt,
2650         .poll =         datagram_poll,
2651         .ioctl =        packet_ioctl,
2652         .listen =       sock_no_listen,
2653         .shutdown =     sock_no_shutdown,
2654         .setsockopt =   sock_no_setsockopt,
2655         .getsockopt =   sock_no_getsockopt,
2656         .sendmsg =      packet_sendmsg_spkt,
2657         .recvmsg =      packet_recvmsg,
2658         .mmap =         sock_no_mmap,
2659         .sendpage =     sock_no_sendpage,
2660 };
2661
2662 static const struct proto_ops packet_ops = {
2663         .family =       PF_PACKET,
2664         .owner =        THIS_MODULE,
2665         .release =      packet_release,
2666         .bind =         packet_bind,
2667         .connect =      sock_no_connect,
2668         .socketpair =   sock_no_socketpair,
2669         .accept =       sock_no_accept,
2670         .getname =      packet_getname,
2671         .poll =         packet_poll,
2672         .ioctl =        packet_ioctl,
2673         .listen =       sock_no_listen,
2674         .shutdown =     sock_no_shutdown,
2675         .setsockopt =   packet_setsockopt,
2676         .getsockopt =   packet_getsockopt,
2677         .sendmsg =      packet_sendmsg,
2678         .recvmsg =      packet_recvmsg,
2679         .mmap =         packet_mmap,
2680         .sendpage =     sock_no_sendpage,
2681 };
2682
2683 static const struct net_proto_family packet_family_ops = {
2684         .family =       PF_PACKET,
2685         .create =       packet_create,
2686         .owner  =       THIS_MODULE,
2687 };
2688
2689 static struct notifier_block packet_netdev_notifier = {
2690         .notifier_call =        packet_notifier,
2691 };
2692
2693 #ifdef CONFIG_PROC_FS
2694
2695 static void *packet_seq_start(struct seq_file *seq, loff_t *pos)
2696         __acquires(RCU)
2697 {
2698         struct net *net = seq_file_net(seq);
2699
2700         rcu_read_lock();
2701         return seq_hlist_start_head_rcu(&net->packet.sklist, *pos);
2702 }
2703
2704 static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2705 {
2706         struct net *net = seq_file_net(seq);
2707         return seq_hlist_next_rcu(v, &net->packet.sklist, pos);
2708 }
2709
2710 static void packet_seq_stop(struct seq_file *seq, void *v)
2711         __releases(RCU)
2712 {
2713         rcu_read_unlock();
2714 }
2715
2716 static int packet_seq_show(struct seq_file *seq, void *v)
2717 {
2718         if (v == SEQ_START_TOKEN)
2719                 seq_puts(seq, "sk       RefCnt Type Proto  Iface R Rmem   User   Inode\n");
2720         else {
2721                 struct sock *s = sk_entry(v);
2722                 const struct packet_sock *po = pkt_sk(s);
2723
2724                 seq_printf(seq,
2725                            "%pK %-6d %-4d %04x   %-5d %1d %-6u %-6u %-6lu\n",
2726                            s,
2727                            atomic_read(&s->sk_refcnt),
2728                            s->sk_type,
2729                            ntohs(po->num),
2730                            po->ifindex,
2731                            po->running,
2732                            atomic_read(&s->sk_rmem_alloc),
2733                            sock_i_uid(s),
2734                            sock_i_ino(s));
2735         }
2736
2737         return 0;
2738 }
2739
2740 static const struct seq_operations packet_seq_ops = {
2741         .start  = packet_seq_start,
2742         .next   = packet_seq_next,
2743         .stop   = packet_seq_stop,
2744         .show   = packet_seq_show,
2745 };
2746
2747 static int packet_seq_open(struct inode *inode, struct file *file)
2748 {
2749         return seq_open_net(inode, file, &packet_seq_ops,
2750                             sizeof(struct seq_net_private));
2751 }
2752
2753 static const struct file_operations packet_seq_fops = {
2754         .owner          = THIS_MODULE,
2755         .open           = packet_seq_open,
2756         .read           = seq_read,
2757         .llseek         = seq_lseek,
2758         .release        = seq_release_net,
2759 };
2760
2761 #endif
2762
2763 static int __net_init packet_net_init(struct net *net)
2764 {
2765         spin_lock_init(&net->packet.sklist_lock);
2766         INIT_HLIST_HEAD(&net->packet.sklist);
2767
2768         if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops))
2769                 return -ENOMEM;
2770
2771         return 0;
2772 }
2773
2774 static void __net_exit packet_net_exit(struct net *net)
2775 {
2776         proc_net_remove(net, "packet");
2777 }
2778
2779 static struct pernet_operations packet_net_ops = {
2780         .init = packet_net_init,
2781         .exit = packet_net_exit,
2782 };
2783
2784
2785 static void __exit packet_exit(void)
2786 {
2787         unregister_netdevice_notifier(&packet_netdev_notifier);
2788         unregister_pernet_subsys(&packet_net_ops);
2789         sock_unregister(PF_PACKET);
2790         proto_unregister(&packet_proto);
2791 }
2792
2793 static int __init packet_init(void)
2794 {
2795         int rc = proto_register(&packet_proto, 0);
2796
2797         if (rc != 0)
2798                 goto out;
2799
2800         sock_register(&packet_family_ops);
2801         register_pernet_subsys(&packet_net_ops);
2802         register_netdevice_notifier(&packet_netdev_notifier);
2803 out:
2804         return rc;
2805 }
2806
2807 module_init(packet_init);
2808 module_exit(packet_exit);
2809 MODULE_LICENSE("GPL");
2810 MODULE_ALIAS_NETPROTO(PF_PACKET);