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