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   1 /*
   2 Experimental ethernet netdevice using ATM AAL5 as underlying carrier
   3 (RFC1483 obsoleted by RFC2684) for Linux 2.4
   4 Author: Marcell GAL, 2000, XDSL Ltd, Hungary
   5 */
   6
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/list.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/ip.h>
  16 #include <asm/uaccess.h>
  17 #include <net/arp.h>
  18 #include <linux/atm.h>
  19 #include <linux/atmdev.h>
  20 #include <linux/capability.h>
  21 #include <linux/seq_file.h>
  22
  23 #include <linux/atmbr2684.h>
  24
  25 #include "common.h"
  26
  27 #ifdef SKB_DEBUG
  28 static void skb_debug(const struct sk_buff *skb)
  29 {
  30 #define NUM2PRINT 50
  31         char buf[NUM2PRINT * 3 + 1];    /* 3 chars per byte */
  32         int i = 0;
  33         for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
  34                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
  35         }
  36         printk(KERN_DEBUG "br2684: skb: %s\n", buf);
  37 }
  38 #else
  39 #define skb_debug(skb)  do {} while (0)
  40 #endif
  41
  42 static unsigned char llc_oui_pid_pad[] =
  43     { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
  44 #define PADLEN  (2)
  45
  46 enum br2684_encaps {
  47         e_vc  = BR2684_ENCAPS_VC,
  48         e_llc = BR2684_ENCAPS_LLC,
  49 };
  50
  51 struct br2684_vcc {
  52         struct atm_vcc  *atmvcc;
  53         struct net_device *device;
  54         /* keep old push,pop functions for chaining */
  55         void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb);
  56         /* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */
  57         enum br2684_encaps encaps;
  58         struct list_head brvccs;
  59 #ifdef CONFIG_ATM_BR2684_IPFILTER
  60         struct br2684_filter filter;
  61 #endif /* CONFIG_ATM_BR2684_IPFILTER */
  62         unsigned copies_needed, copies_failed;
  63 };
  64
  65 struct br2684_dev {
  66         struct net_device *net_dev;
  67         struct list_head br2684_devs;
  68         int number;
  69         struct list_head brvccs; /* one device <=> one vcc (before xmas) */
  70         struct net_device_stats stats;
  71         int mac_was_set;
  72 };
  73
  74 /*
  75  * This lock should be held for writing any time the list of devices or
  76  * their attached vcc's could be altered.  It should be held for reading
  77  * any time these are being queried.  Note that we sometimes need to
  78  * do read-locking under interrupt context, so write locking must block
  79  * the current CPU's interrupts
  80  */
  81 static DEFINE_RWLOCK(devs_lock);
  82
  83 static LIST_HEAD(br2684_devs);
  84
  85 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
  86 {
  87         return (struct br2684_dev *) net_dev->priv;
  88 }
  89
  90 static inline struct net_device *list_entry_brdev(const struct list_head *le)
  91 {
  92         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
  93 }
  94
  95 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
  96 {
  97         return (struct br2684_vcc *) (atmvcc->user_back);
  98 }
  99
 100 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
 101 {
 102         return list_entry(le, struct br2684_vcc, brvccs);
 103 }
 104
 105 /* Caller should hold read_lock(&devs_lock) */
 106 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
 107 {
 108         struct list_head *lh;
 109         struct net_device *net_dev;
 110         switch (s->method) {
 111         case BR2684_FIND_BYNUM:
 112                 list_for_each(lh, &br2684_devs) {
 113                         net_dev = list_entry_brdev(lh);
 114                         if (BRPRIV(net_dev)->number == s->spec.devnum)
 115                                 return net_dev;
 116                 }
 117                 break;
 118         case BR2684_FIND_BYIFNAME:
 119                 list_for_each(lh, &br2684_devs) {
 120                         net_dev = list_entry_brdev(lh);
 121                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
 122                                 return net_dev;
 123                 }
 124                 break;
 125         }
 126         return NULL;
 127 }
 128
 129 /*
 130  * Send a packet out a particular vcc.  Not to useful right now, but paves
 131  * the way for multiple vcc's per itf.  Returns true if we can send,
 132  * otherwise false
 133  */
 134 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
 135         struct br2684_vcc *brvcc)
 136 {
 137         struct atm_vcc *atmvcc;
 138         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
 139         if (skb_headroom(skb) < minheadroom) {
 140                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
 141                 brvcc->copies_needed++;
 142                 dev_kfree_skb(skb);
 143                 if (skb2 == NULL) {
 144                         brvcc->copies_failed++;
 145                         return 0;
 146                 }
 147                 skb = skb2;
 148         }
 149         skb_push(skb, minheadroom);
 150         if (brvcc->encaps == e_llc)
 151                 skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10);
 152         else
 153                 memset(skb->data, 0, 2);
 154         skb_debug(skb);
 155
 156         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 157         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 158         if (!atm_may_send(atmvcc, skb->truesize)) {
 159                 /* we free this here for now, because we cannot know in a higher
 160                         layer whether the skb point it supplied wasn't freed yet.
 161                         now, it always is.
 162                 */
 163                 dev_kfree_skb(skb);
 164                 return 0;
 165                 }
 166         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 167         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 168         brdev->stats.tx_packets++;
 169         brdev->stats.tx_bytes += skb->len;
 170         atmvcc->send(atmvcc, skb);
 171         return 1;
 172 }
 173
 174 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
 175         struct br2684_dev *brdev)
 176 {
 177         return list_empty(&brdev->brvccs) ? NULL :
 178             list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
 179 }
 180
 181 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
 182 {
 183         struct br2684_dev *brdev = BRPRIV(dev);
 184         struct br2684_vcc *brvcc;
 185
 186         pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
 187         read_lock(&devs_lock);
 188         brvcc = pick_outgoing_vcc(skb, brdev);
 189         if (brvcc == NULL) {
 190                 pr_debug("no vcc attached to dev %s\n", dev->name);
 191                 brdev->stats.tx_errors++;
 192                 brdev->stats.tx_carrier_errors++;
 193                 /* netif_stop_queue(dev); */
 194                 dev_kfree_skb(skb);
 195                 read_unlock(&devs_lock);
 196                 return 0;
 197         }
 198         if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
 199                 /*
 200                  * We should probably use netif_*_queue() here, but that
 201                  * involves added complication.  We need to walk before
 202                  * we can run
 203                  */
 204                 /* don't free here! this pointer might be no longer valid!
 205                 dev_kfree_skb(skb);
 206                 */
 207                 brdev->stats.tx_errors++;
 208                 brdev->stats.tx_fifo_errors++;
 209         }
 210         read_unlock(&devs_lock);
 211         return 0;
 212 }
 213
 214 static struct net_device_stats *br2684_get_stats(struct net_device *dev)
 215 {
 216         pr_debug("br2684_get_stats\n");
 217         return &BRPRIV(dev)->stats;
 218 }
 219
 220
 221 /*
 222  * We remember when the MAC gets set, so we don't override it later with
 223  * the ESI of the ATM card of the first VC
 224  */
 225 static int (*my_eth_mac_addr)(struct net_device *, void *);
 226 static int br2684_mac_addr(struct net_device *dev, void *p)
 227 {
 228         int err = my_eth_mac_addr(dev, p);
 229         if (!err)
 230                 BRPRIV(dev)->mac_was_set = 1;
 231         return err;
 232 }
 233
 234 #ifdef CONFIG_ATM_BR2684_IPFILTER
 235 /* this IOCTL is experimental. */
 236 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg)
 237 {
 238         struct br2684_vcc *brvcc;
 239         struct br2684_filter_set fs;
 240
 241         if (copy_from_user(&fs, arg, sizeof fs))
 242                 return -EFAULT;
 243         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 244                 /*
 245                  * This is really a per-vcc thing, but we can also search
 246                  * by device
 247                  */
 248                 struct br2684_dev *brdev;
 249                 read_lock(&devs_lock);
 250                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 251                 if (brdev == NULL || list_empty(&brdev->brvccs) ||
 252                     brdev->brvccs.next != brdev->brvccs.prev)  /* >1 VCC */
 253                         brvcc = NULL;
 254                 else
 255                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 256                 read_unlock(&devs_lock);
 257                 if (brvcc == NULL)
 258                         return -ESRCH;
 259         } else
 260                 brvcc = BR2684_VCC(atmvcc);
 261         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 262         return 0;
 263 }
 264
 265 /* Returns 1 if packet should be dropped */
 266 static inline int
 267 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 268 {
 269         if (brvcc->filter.netmask == 0)
 270                 return 0;                       /* no filter in place */
 271         if (type == htons(ETH_P_IP) &&
 272             (((struct iphdr *) (skb->data))->daddr & brvcc->filter.
 273              netmask) == brvcc->filter.prefix)
 274                 return 0;
 275         if (type == htons(ETH_P_ARP))
 276                 return 0;
 277         /* TODO: we should probably filter ARPs too.. don't want to have
 278          *   them returning values that don't make sense, or is that ok?
 279          */
 280         return 1;               /* drop */
 281 }
 282 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 283
 284 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 285 {
 286         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 287         write_lock_irq(&devs_lock);
 288         list_del(&brvcc->brvccs);
 289         write_unlock_irq(&devs_lock);
 290         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 291         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 292         kfree(brvcc);
 293         module_put(THIS_MODULE);
 294 }
 295
 296 /* when AAL5 PDU comes in: */
 297 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 298 {
 299         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 300         struct net_device *net_dev = brvcc->device;
 301         struct br2684_dev *brdev = BRPRIV(net_dev);
 302         int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN;
 303
 304         pr_debug("br2684_push\n");
 305
 306         if (unlikely(skb == NULL)) {
 307                 /* skb==NULL means VCC is being destroyed */
 308                 br2684_close_vcc(brvcc);
 309                 if (list_empty(&brdev->brvccs)) {
 310                         read_lock(&devs_lock);
 311                         list_del(&brdev->br2684_devs);
 312                         read_unlock(&devs_lock);
 313                         unregister_netdev(net_dev);
 314                         free_netdev(net_dev);
 315                 }
 316                 return;
 317         }
 318
 319         skb_debug(skb);
 320         atm_return(atmvcc, skb->truesize);
 321         pr_debug("skb from brdev %p\n", brdev);
 322         if (brvcc->encaps == e_llc) {
 323                 /* let us waste some time for checking the encapsulation.
 324                    Note, that only 7 char is checked so frames with a valid FCS
 325                    are also accepted (but FCS is not checked of course) */
 326                 if (memcmp(skb->data, llc_oui_pid_pad, 7)) {
 327                         brdev->stats.rx_errors++;
 328                         dev_kfree_skb(skb);
 329                         return;
 330                 }
 331
 332                 /* Strip FCS if present */
 333                 if (skb->len > 7 && skb->data[7] == 0x01)
 334                         __skb_trim(skb, skb->len - 4);
 335         } else {
 336                 plen = PADLEN + ETH_HLEN;       /* pad, dstmac,srcmac, ethtype */
 337                 /* first 2 chars should be 0 */
 338                 if (*((u16 *) (skb->data)) != 0) {
 339                         brdev->stats.rx_errors++;
 340                         dev_kfree_skb(skb);
 341                         return;
 342                 }
 343         }
 344         if (skb->len < plen) {
 345                 brdev->stats.rx_errors++;
 346                 dev_kfree_skb(skb);     /* dev_ not needed? */
 347                 return;
 348         }
 349
 350         skb_pull(skb, plen - ETH_HLEN);
 351         skb->protocol = eth_type_trans(skb, net_dev);
 352 #ifdef CONFIG_ATM_BR2684_IPFILTER
 353         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
 354                 brdev->stats.rx_dropped++;
 355                 dev_kfree_skb(skb);
 356                 return;
 357         }
 358 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 359         skb->dev = net_dev;
 360         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 361         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
 362         skb_debug(skb);
 363         if (unlikely(!(net_dev->flags & IFF_UP))) {
 364                 /* sigh, interface is down */
 365                 brdev->stats.rx_dropped++;
 366                 dev_kfree_skb(skb);
 367                 return;
 368         }
 369         brdev->stats.rx_packets++;
 370         brdev->stats.rx_bytes += skb->len;
 371         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 372         netif_rx(skb);
 373 }
 374
 375 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg)
 376 {
 377 /* assign a vcc to a dev
 378 Note: we do not have explicit unassign, but look at _push()
 379 */
 380         int err;
 381         struct br2684_vcc *brvcc;
 382         struct sk_buff *skb;
 383         struct sk_buff_head *rq;
 384         struct br2684_dev *brdev;
 385         struct net_device *net_dev;
 386         struct atm_backend_br2684 be;
 387         unsigned long flags;
 388
 389         if (copy_from_user(&be, arg, sizeof be))
 390                 return -EFAULT;
 391         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 392         if (!brvcc)
 393                 return -ENOMEM;
 394         write_lock_irq(&devs_lock);
 395         net_dev = br2684_find_dev(&be.ifspec);
 396         if (net_dev == NULL) {
 397                 printk(KERN_ERR
 398                     "br2684: tried to attach to non-existant device\n");
 399                 err = -ENXIO;
 400                 goto error;
 401         }
 402         brdev = BRPRIV(net_dev);
 403         if (atmvcc->push == NULL) {
 404                 err = -EBADFD;
 405                 goto error;
 406         }
 407         if (!list_empty(&brdev->brvccs)) {
 408                 /* Only 1 VCC/dev right now */
 409                 err = -EEXIST;
 410                 goto error;
 411         }
 412         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
 413             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
 414             BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) ||
 415             be.min_size != 0) {
 416                 err = -EINVAL;
 417                 goto error;
 418         }
 419         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps,
 420                 brvcc);
 421         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 422                 unsigned char *esi = atmvcc->dev->esi;
 423                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 424                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 425                 else
 426                         net_dev->dev_addr[2] = 1;
 427         }
 428         list_add(&brvcc->brvccs, &brdev->brvccs);
 429         write_unlock_irq(&devs_lock);
 430         brvcc->device = net_dev;
 431         brvcc->atmvcc = atmvcc;
 432         atmvcc->user_back = brvcc;
 433         brvcc->encaps = (enum br2684_encaps) be.encaps;
 434         brvcc->old_push = atmvcc->push;
 435         barrier();
 436         atmvcc->push = br2684_push;
 437
 438         rq = &sk_atm(atmvcc)->sk_receive_queue;
 439
 440         spin_lock_irqsave(&rq->lock, flags);
 441         if (skb_queue_empty(rq)) {
 442                 skb = NULL;
 443         } else {
 444                 /* NULL terminate the list.  */
 445                 rq->prev->next = NULL;
 446                 skb = rq->next;
 447         }
 448         rq->prev = rq->next = (struct sk_buff *)rq;
 449         rq->qlen = 0;
 450         spin_unlock_irqrestore(&rq->lock, flags);
 451
 452         while (skb) {
 453                 struct sk_buff *next = skb->next;
 454
 455                 skb->next = skb->prev = NULL;
 456                 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
 457                 BRPRIV(skb->dev)->stats.rx_packets--;
 458                 br2684_push(atmvcc, skb);
 459
 460                 skb = next;
 461         }
 462         __module_get(THIS_MODULE);
 463         return 0;
 464     error:
 465         write_unlock_irq(&devs_lock);
 466         kfree(brvcc);
 467         return err;
 468 }
 469
 470 static void br2684_setup(struct net_device *netdev)
 471 {
 472         struct br2684_dev *brdev = BRPRIV(netdev);
 473
 474         ether_setup(netdev);
 475         brdev->net_dev = netdev;
 476
 477         my_eth_mac_addr = netdev->set_mac_address;
 478         netdev->set_mac_address = br2684_mac_addr;
 479         netdev->hard_start_xmit = br2684_start_xmit;
 480         netdev->get_stats = br2684_get_stats;
 481
 482         INIT_LIST_HEAD(&brdev->brvccs);
 483 }
 484
 485 static int br2684_create(void __user *arg)
 486 {
 487         int err;
 488         struct net_device *netdev;
 489         struct br2684_dev *brdev;
 490         struct atm_newif_br2684 ni;
 491
 492         pr_debug("br2684_create\n");
 493
 494         if (copy_from_user(&ni, arg, sizeof ni)) {
 495                 return -EFAULT;
 496         }
 497         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
 498                 return -EINVAL;
 499         }
 500
 501         netdev = alloc_netdev(sizeof(struct br2684_dev),
 502                               ni.ifname[0] ? ni.ifname : "nas%d",
 503                               br2684_setup);
 504         if (!netdev)
 505                 return -ENOMEM;
 506
 507         brdev = BRPRIV(netdev);
 508
 509         pr_debug("registered netdev %s\n", netdev->name);
 510         /* open, stop, do_ioctl ? */
 511         err = register_netdev(netdev);
 512         if (err < 0) {
 513                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
 514                 free_netdev(netdev);
 515                 return err;
 516         }
 517
 518         write_lock_irq(&devs_lock);
 519         brdev->number = list_empty(&br2684_devs) ? 1 :
 520             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 521         list_add_tail(&brdev->br2684_devs, &br2684_devs);
 522         write_unlock_irq(&devs_lock);
 523         return 0;
 524 }
 525
 526 /*
 527  * This handles ioctls actually performed on our vcc - we must return
 528  * -ENOIOCTLCMD for any unrecognized ioctl
 529  */
 530 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
 531         unsigned long arg)
 532 {
 533         struct atm_vcc *atmvcc = ATM_SD(sock);
 534         void __user *argp = (void __user *)arg;
 535
 536         int err;
 537         switch(cmd) {
 538         case ATM_SETBACKEND:
 539         case ATM_NEWBACKENDIF: {
 540                 atm_backend_t b;
 541                 err = get_user(b, (atm_backend_t __user *) argp);
 542                 if (err)
 543                         return -EFAULT;
 544                 if (b != ATM_BACKEND_BR2684)
 545                         return -ENOIOCTLCMD;
 546                 if (!capable(CAP_NET_ADMIN))
 547                         return -EPERM;
 548                 if (cmd == ATM_SETBACKEND)
 549                         return br2684_regvcc(atmvcc, argp);
 550                 else
 551                         return br2684_create(argp);
 552                 }
 553 #ifdef CONFIG_ATM_BR2684_IPFILTER
 554         case BR2684_SETFILT:
 555                 if (atmvcc->push != br2684_push)
 556                         return -ENOIOCTLCMD;
 557                 if (!capable(CAP_NET_ADMIN))
 558                         return -EPERM;
 559                 err = br2684_setfilt(atmvcc, argp);
 560                 return err;
 561 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 562         }
 563         return -ENOIOCTLCMD;
 564 }
 565
 566 static struct atm_ioctl br2684_ioctl_ops = {
 567         .owner  = THIS_MODULE,
 568         .ioctl  = br2684_ioctl,
 569 };
 570
 571
 572 #ifdef CONFIG_PROC_FS
 573 static void *br2684_seq_start(struct seq_file *seq, loff_t *pos)
 574 {
 575         read_lock(&devs_lock);
 576         return seq_list_start(&br2684_devs, *pos);
 577 }
 578
 579 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 580 {
 581         return seq_list_next(v, &br2684_devs, pos);
 582 }
 583
 584 static void br2684_seq_stop(struct seq_file *seq, void *v)
 585 {
 586         read_unlock(&devs_lock);
 587 }
 588
 589 static int br2684_seq_show(struct seq_file *seq, void *v)
 590 {
 591         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
 592                         br2684_devs);
 593         const struct net_device *net_dev = brdev->net_dev;
 594         const struct br2684_vcc *brvcc;
 595         DECLARE_MAC_BUF(mac);
 596
 597         seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
 598                    net_dev->name,
 599                    brdev->number,
 600                    print_mac(mac, net_dev->dev_addr),
 601                    brdev->mac_was_set ? "set" : "auto");
 602
 603         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 604                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s"
 605                                     ", failed copies %u/%u"
 606                                     "\n", brvcc->atmvcc->dev->number,
 607                                     brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 608                                     (brvcc->encaps == e_llc) ? "LLC" : "VC"
 609                                     , brvcc->copies_failed
 610                                     , brvcc->copies_needed
 611                                     );
 612 #ifdef CONFIG_ATM_BR2684_IPFILTER
 613 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 614 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 615                         if (brvcc->filter.netmask != 0)
 616                                 seq_printf(seq, "    filter=%d.%d.%d.%d/"
 617                                                 "%d.%d.%d.%d\n",
 618                                                 bs(prefix), bs(netmask));
 619 #undef bs
 620 #undef b1
 621 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 622         }
 623         return 0;
 624 }
 625
 626 static const struct seq_operations br2684_seq_ops = {
 627         .start = br2684_seq_start,
 628         .next  = br2684_seq_next,
 629         .stop  = br2684_seq_stop,
 630         .show  = br2684_seq_show,
 631 };
 632
 633 static int br2684_proc_open(struct inode *inode, struct file *file)
 634 {
 635         return seq_open(file, &br2684_seq_ops);
 636 }
 637
 638 static const struct file_operations br2684_proc_ops = {
 639         .owner   = THIS_MODULE,
 640         .open    = br2684_proc_open,
 641         .read    = seq_read,
 642         .llseek  = seq_lseek,
 643         .release = seq_release,
 644 };
 645
 646 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 647 #endif
 648
 649 static int __init br2684_init(void)
 650 {
 651 #ifdef CONFIG_PROC_FS
 652         struct proc_dir_entry *p;
 653         if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
 654                 return -ENOMEM;
 655         p->proc_fops = &br2684_proc_ops;
 656 #endif
 657         register_atm_ioctl(&br2684_ioctl_ops);
 658         return 0;
 659 }
 660
 661 static void __exit br2684_exit(void)
 662 {
 663         struct net_device *net_dev;
 664         struct br2684_dev *brdev;
 665         struct br2684_vcc *brvcc;
 666         deregister_atm_ioctl(&br2684_ioctl_ops);
 667
 668 #ifdef CONFIG_PROC_FS
 669         remove_proc_entry("br2684", atm_proc_root);
 670 #endif
 671
 672         while (!list_empty(&br2684_devs)) {
 673                 net_dev = list_entry_brdev(br2684_devs.next);
 674                 brdev = BRPRIV(net_dev);
 675                 while (!list_empty(&brdev->brvccs)) {
 676                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 677                         br2684_close_vcc(brvcc);
 678                 }
 679
 680                 list_del(&brdev->br2684_devs);
 681                 unregister_netdev(net_dev);
 682                 free_netdev(net_dev);
 683         }
 684 }
 685
 686 module_init(br2684_init);
 687 module_exit(br2684_exit);
 688
 689 MODULE_AUTHOR("Marcell GAL");
 690 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 691 MODULE_LICENSE("GPL");