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   1 /*
   2  * Ethernet netdevice using ATM AAL5 as underlying carrier
   3  * (RFC1483 obsoleted by RFC2684) for Linux
   4  *
   5  * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
   6  *          Eric Kinzie, 2006-2007, US Naval Research Laboratory
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/list.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/ip.h>
  18 #include <asm/uaccess.h>
  19 #include <net/arp.h>
  20 #include <linux/atm.h>
  21 #include <linux/atmdev.h>
  22 #include <linux/capability.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <linux/atmbr2684.h>
  26
  27 #include "common.h"
  28
  29 #ifdef SKB_DEBUG
  30 static void skb_debug(const struct sk_buff *skb)
  31 {
  32 #define NUM2PRINT 50
  33         char buf[NUM2PRINT * 3 + 1];    /* 3 chars per byte */
  34         int i = 0;
  35         for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
  36                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
  37         }
  38         printk(KERN_DEBUG "br2684: skb: %s\n", buf);
  39 }
  40 #else
  41 #define skb_debug(skb)  do {} while (0)
  42 #endif
  43
  44 #define BR2684_ETHERTYPE_LEN    2
  45 #define BR2684_PAD_LEN          2
  46
  47 #define LLC             0xaa, 0xaa, 0x03
  48 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
  49 #define SNAP_ROUTED     0x00, 0x00, 0x00
  50 #define PID_ETHERNET    0x00, 0x07
  51 #define ETHERTYPE_IPV4  0x08, 0x00
  52 #define ETHERTYPE_IPV6  0x86, 0xdd
  53 #define PAD_BRIDGED     0x00, 0x00
  54
  55 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
  56 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
  57 static const unsigned char llc_oui_pid_pad[] =
  58                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
  59 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
  60 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
  61
  62 enum br2684_encaps {
  63         e_vc = BR2684_ENCAPS_VC,
  64         e_llc = BR2684_ENCAPS_LLC,
  65 };
  66
  67 struct br2684_vcc {
  68         struct atm_vcc *atmvcc;
  69         struct net_device *device;
  70         /* keep old push, pop functions for chaining */
  71         void (*old_push) (struct atm_vcc * vcc, struct sk_buff * skb);
  72         /* void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); */
  73         enum br2684_encaps encaps;
  74         struct list_head brvccs;
  75 #ifdef CONFIG_ATM_BR2684_IPFILTER
  76         struct br2684_filter filter;
  77 #endif /* CONFIG_ATM_BR2684_IPFILTER */
  78         unsigned copies_needed, copies_failed;
  79 };
  80
  81 struct br2684_dev {
  82         struct net_device *net_dev;
  83         struct list_head br2684_devs;
  84         int number;
  85         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
  86         int mac_was_set;
  87         enum br2684_payload payload;
  88 };
  89
  90 /*
  91  * This lock should be held for writing any time the list of devices or
  92  * their attached vcc's could be altered.  It should be held for reading
  93  * any time these are being queried.  Note that we sometimes need to
  94  * do read-locking under interrupt context, so write locking must block
  95  * the current CPU's interrupts
  96  */
  97 static DEFINE_RWLOCK(devs_lock);
  98
  99 static LIST_HEAD(br2684_devs);
 100
 101 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
 102 {
 103         return (struct br2684_dev *)netdev_priv(net_dev);
 104 }
 105
 106 static inline struct net_device *list_entry_brdev(const struct list_head *le)
 107 {
 108         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
 109 }
 110
 111 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
 112 {
 113         return (struct br2684_vcc *)(atmvcc->user_back);
 114 }
 115
 116 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
 117 {
 118         return list_entry(le, struct br2684_vcc, brvccs);
 119 }
 120
 121 /* Caller should hold read_lock(&devs_lock) */
 122 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
 123 {
 124         struct list_head *lh;
 125         struct net_device *net_dev;
 126         switch (s->method) {
 127         case BR2684_FIND_BYNUM:
 128                 list_for_each(lh, &br2684_devs) {
 129                         net_dev = list_entry_brdev(lh);
 130                         if (BRPRIV(net_dev)->number == s->spec.devnum)
 131                                 return net_dev;
 132                 }
 133                 break;
 134         case BR2684_FIND_BYIFNAME:
 135                 list_for_each(lh, &br2684_devs) {
 136                         net_dev = list_entry_brdev(lh);
 137                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
 138                                 return net_dev;
 139                 }
 140                 break;
 141         }
 142         return NULL;
 143 }
 144
 145 /*
 146  * Send a packet out a particular vcc.  Not to useful right now, but paves
 147  * the way for multiple vcc's per itf.  Returns true if we can send,
 148  * otherwise false
 149  */
 150 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
 151                            struct br2684_vcc *brvcc)
 152 {
 153         struct br2684_dev *brdev = BRPRIV(dev);
 154         struct atm_vcc *atmvcc;
 155         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
 156
 157         if (skb_headroom(skb) < minheadroom) {
 158                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
 159                 brvcc->copies_needed++;
 160                 dev_kfree_skb(skb);
 161                 if (skb2 == NULL) {
 162                         brvcc->copies_failed++;
 163                         return 0;
 164                 }
 165                 skb = skb2;
 166         }
 167
 168         if (brvcc->encaps == e_llc) {
 169                 if (brdev->payload == p_bridged) {
 170                         skb_push(skb, sizeof(llc_oui_pid_pad));
 171                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
 172                                                 sizeof(llc_oui_pid_pad));
 173                 } else if (brdev->payload == p_routed) {
 174                         unsigned short prot = ntohs(skb->protocol);
 175
 176                         skb_push(skb, sizeof(llc_oui_ipv4));
 177                         switch (prot) {
 178                         case ETH_P_IP:
 179                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
 180                                                         sizeof(llc_oui_ipv4));
 181                                 break;
 182                         case ETH_P_IPV6:
 183                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
 184                                                         sizeof(llc_oui_ipv6));
 185                                 break;
 186                         default:
 187                                 dev_kfree_skb(skb);
 188                                 return 0;
 189                         }
 190                 }
 191         } else { /* e_vc */
 192                 if (brdev->payload == p_bridged) {
 193                         skb_push(skb, 2);
 194                         memset(skb->data, 0, 2);
 195                 } else { /* p_routed */
 196                         skb_pull(skb, ETH_HLEN);
 197                 }
 198         }
 199         skb_debug(skb);
 200
 201         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 202         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 203         if (!atm_may_send(atmvcc, skb->truesize)) {
 204                 /*
 205                  * We free this here for now, because we cannot know in a higher
 206                  * layer whether the skb pointer it supplied wasn't freed yet.
 207                  * Now, it always is.
 208                  */
 209                 dev_kfree_skb(skb);
 210                 return 0;
 211         }
 212         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 213         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 214         dev->stats.tx_packets++;
 215         dev->stats.tx_bytes += skb->len;
 216         atmvcc->send(atmvcc, skb);
 217         return 1;
 218 }
 219
 220 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
 221                                                    const struct br2684_dev *brdev)
 222 {
 223         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
 224 }
 225
 226 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
 227                                      struct net_device *dev)
 228 {
 229         struct br2684_dev *brdev = BRPRIV(dev);
 230         struct br2684_vcc *brvcc;
 231
 232         pr_debug("br2684_start_xmit, skb_dst(skb)=%p\n", skb_dst(skb));
 233         read_lock(&devs_lock);
 234         brvcc = pick_outgoing_vcc(skb, brdev);
 235         if (brvcc == NULL) {
 236                 pr_debug("no vcc attached to dev %s\n", dev->name);
 237                 dev->stats.tx_errors++;
 238                 dev->stats.tx_carrier_errors++;
 239                 /* netif_stop_queue(dev); */
 240                 dev_kfree_skb(skb);
 241                 read_unlock(&devs_lock);
 242                 return NETDEV_TX_OK;
 243         }
 244         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
 245                 /*
 246                  * We should probably use netif_*_queue() here, but that
 247                  * involves added complication.  We need to walk before
 248                  * we can run.
 249                  *
 250                  * Don't free here! this pointer might be no longer valid!
 251                  */
 252                 dev->stats.tx_errors++;
 253                 dev->stats.tx_fifo_errors++;
 254         }
 255         read_unlock(&devs_lock);
 256         return NETDEV_TX_OK;
 257 }
 258
 259 /*
 260  * We remember when the MAC gets set, so we don't override it later with
 261  * the ESI of the ATM card of the first VC
 262  */
 263 static int br2684_mac_addr(struct net_device *dev, void *p)
 264 {
 265         int err = eth_mac_addr(dev, p);
 266         if (!err)
 267                 BRPRIV(dev)->mac_was_set = 1;
 268         return err;
 269 }
 270
 271 #ifdef CONFIG_ATM_BR2684_IPFILTER
 272 /* this IOCTL is experimental. */
 273 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 274 {
 275         struct br2684_vcc *brvcc;
 276         struct br2684_filter_set fs;
 277
 278         if (copy_from_user(&fs, arg, sizeof fs))
 279                 return -EFAULT;
 280         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 281                 /*
 282                  * This is really a per-vcc thing, but we can also search
 283                  * by device.
 284                  */
 285                 struct br2684_dev *brdev;
 286                 read_lock(&devs_lock);
 287                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 288                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
 289                         brvcc = NULL;
 290                 else
 291                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 292                 read_unlock(&devs_lock);
 293                 if (brvcc == NULL)
 294                         return -ESRCH;
 295         } else
 296                 brvcc = BR2684_VCC(atmvcc);
 297         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 298         return 0;
 299 }
 300
 301 /* Returns 1 if packet should be dropped */
 302 static inline int
 303 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 304 {
 305         if (brvcc->filter.netmask == 0)
 306                 return 0;       /* no filter in place */
 307         if (type == htons(ETH_P_IP) &&
 308             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
 309              netmask) == brvcc->filter.prefix)
 310                 return 0;
 311         if (type == htons(ETH_P_ARP))
 312                 return 0;
 313         /*
 314          * TODO: we should probably filter ARPs too.. don't want to have
 315          * them returning values that don't make sense, or is that ok?
 316          */
 317         return 1;               /* drop */
 318 }
 319 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 320
 321 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 322 {
 323         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 324         write_lock_irq(&devs_lock);
 325         list_del(&brvcc->brvccs);
 326         write_unlock_irq(&devs_lock);
 327         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 328         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 329         kfree(brvcc);
 330         module_put(THIS_MODULE);
 331 }
 332
 333 /* when AAL5 PDU comes in: */
 334 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 335 {
 336         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 337         struct net_device *net_dev = brvcc->device;
 338         struct br2684_dev *brdev = BRPRIV(net_dev);
 339
 340         pr_debug("br2684_push\n");
 341
 342         if (unlikely(skb == NULL)) {
 343                 /* skb==NULL means VCC is being destroyed */
 344                 br2684_close_vcc(brvcc);
 345                 if (list_empty(&brdev->brvccs)) {
 346                         write_lock_irq(&devs_lock);
 347                         list_del(&brdev->br2684_devs);
 348                         write_unlock_irq(&devs_lock);
 349                         unregister_netdev(net_dev);
 350                         free_netdev(net_dev);
 351                 }
 352                 return;
 353         }
 354
 355         skb_debug(skb);
 356         atm_return(atmvcc, skb->truesize);
 357         pr_debug("skb from brdev %p\n", brdev);
 358         if (brvcc->encaps == e_llc) {
 359
 360                 if (skb->len > 7 && skb->data[7] == 0x01)
 361                         __skb_trim(skb, skb->len - 4);
 362
 363                 /* accept packets that have "ipv[46]" in the snap header */
 364                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
 365                     &&
 366                     (memcmp
 367                      (skb->data, llc_oui_ipv4,
 368                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
 369                         if (memcmp
 370                             (skb->data + 6, ethertype_ipv6,
 371                              sizeof(ethertype_ipv6)) == 0)
 372                                 skb->protocol = htons(ETH_P_IPV6);
 373                         else if (memcmp
 374                                  (skb->data + 6, ethertype_ipv4,
 375                                   sizeof(ethertype_ipv4)) == 0)
 376                                 skb->protocol = htons(ETH_P_IP);
 377                         else
 378                                 goto error;
 379                         skb_pull(skb, sizeof(llc_oui_ipv4));
 380                         skb_reset_network_header(skb);
 381                         skb->pkt_type = PACKET_HOST;
 382                         /*
 383                          * Let us waste some time for checking the encapsulation.
 384                          * Note, that only 7 char is checked so frames with a valid FCS
 385                          * are also accepted (but FCS is not checked of course).
 386                          */
 387                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
 388                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
 389                         skb_pull(skb, sizeof(llc_oui_pid_pad));
 390                         skb->protocol = eth_type_trans(skb, net_dev);
 391                 } else
 392                         goto error;
 393
 394         } else { /* e_vc */
 395                 if (brdev->payload == p_routed) {
 396                         struct iphdr *iph;
 397
 398                         skb_reset_network_header(skb);
 399                         iph = ip_hdr(skb);
 400                         if (iph->version == 4)
 401                                 skb->protocol = htons(ETH_P_IP);
 402                         else if (iph->version == 6)
 403                                 skb->protocol = htons(ETH_P_IPV6);
 404                         else
 405                                 goto error;
 406                         skb->pkt_type = PACKET_HOST;
 407                 } else { /* p_bridged */
 408                         /* first 2 chars should be 0 */
 409                         if (*((u16 *) (skb->data)) != 0)
 410                                 goto error;
 411                         skb_pull(skb, BR2684_PAD_LEN);
 412                         skb->protocol = eth_type_trans(skb, net_dev);
 413                 }
 414         }
 415
 416 #ifdef CONFIG_ATM_BR2684_IPFILTER
 417         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
 418                 goto dropped;
 419 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 420         skb->dev = net_dev;
 421         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 422         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
 423         skb_debug(skb);
 424         /* sigh, interface is down? */
 425         if (unlikely(!(net_dev->flags & IFF_UP)))
 426                 goto dropped;
 427         net_dev->stats.rx_packets++;
 428         net_dev->stats.rx_bytes += skb->len;
 429         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 430         netif_rx(skb);
 431         return;
 432
 433 dropped:
 434         net_dev->stats.rx_dropped++;
 435         goto free_skb;
 436 error:
 437         net_dev->stats.rx_errors++;
 438 free_skb:
 439         dev_kfree_skb(skb);
 440         return;
 441 }
 442
 443 /*
 444  * Assign a vcc to a dev
 445  * Note: we do not have explicit unassign, but look at _push()
 446  */
 447 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
 448 {
 449         struct sk_buff_head queue;
 450         int err;
 451         struct br2684_vcc *brvcc;
 452         struct sk_buff *skb, *tmp;
 453         struct sk_buff_head *rq;
 454         struct br2684_dev *brdev;
 455         struct net_device *net_dev;
 456         struct atm_backend_br2684 be;
 457         unsigned long flags;
 458
 459         if (copy_from_user(&be, arg, sizeof be))
 460                 return -EFAULT;
 461         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 462         if (!brvcc)
 463                 return -ENOMEM;
 464         write_lock_irq(&devs_lock);
 465         net_dev = br2684_find_dev(&be.ifspec);
 466         if (net_dev == NULL) {
 467                 printk(KERN_ERR
 468                        "br2684: tried to attach to non-existant device\n");
 469                 err = -ENXIO;
 470                 goto error;
 471         }
 472         brdev = BRPRIV(net_dev);
 473         if (atmvcc->push == NULL) {
 474                 err = -EBADFD;
 475                 goto error;
 476         }
 477         if (!list_empty(&brdev->brvccs)) {
 478                 /* Only 1 VCC/dev right now */
 479                 err = -EEXIST;
 480                 goto error;
 481         }
 482         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
 483             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
 484                                                                BR2684_ENCAPS_VC
 485                                                                && be.encaps !=
 486                                                                BR2684_ENCAPS_LLC)
 487             || be.min_size != 0) {
 488                 err = -EINVAL;
 489                 goto error;
 490         }
 491         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
 492                  be.encaps, brvcc);
 493         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 494                 unsigned char *esi = atmvcc->dev->esi;
 495                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 496                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 497                 else
 498                         net_dev->dev_addr[2] = 1;
 499         }
 500         list_add(&brvcc->brvccs, &brdev->brvccs);
 501         write_unlock_irq(&devs_lock);
 502         brvcc->device = net_dev;
 503         brvcc->atmvcc = atmvcc;
 504         atmvcc->user_back = brvcc;
 505         brvcc->encaps = (enum br2684_encaps)be.encaps;
 506         brvcc->old_push = atmvcc->push;
 507         barrier();
 508         atmvcc->push = br2684_push;
 509
 510         __skb_queue_head_init(&queue);
 511         rq = &sk_atm(atmvcc)->sk_receive_queue;
 512
 513         spin_lock_irqsave(&rq->lock, flags);
 514         skb_queue_splice_init(rq, &queue);
 515         spin_unlock_irqrestore(&rq->lock, flags);
 516
 517         skb_queue_walk_safe(&queue, skb, tmp) {
 518                 struct net_device *dev = skb->dev;
 519
 520                 dev->stats.rx_bytes -= skb->len;
 521                 dev->stats.rx_packets--;
 522
 523                 br2684_push(atmvcc, skb);
 524         }
 525         __module_get(THIS_MODULE);
 526         return 0;
 527       error:
 528         write_unlock_irq(&devs_lock);
 529         kfree(brvcc);
 530         return err;
 531 }
 532
 533 static const struct net_device_ops br2684_netdev_ops = {
 534         .ndo_start_xmit         = br2684_start_xmit,
 535         .ndo_set_mac_address    = br2684_mac_addr,
 536         .ndo_change_mtu         = eth_change_mtu,
 537         .ndo_validate_addr      = eth_validate_addr,
 538 };
 539
 540 static void br2684_setup(struct net_device *netdev)
 541 {
 542         struct br2684_dev *brdev = BRPRIV(netdev);
 543
 544         ether_setup(netdev);
 545         brdev->net_dev = netdev;
 546
 547         netdev->netdev_ops = &br2684_netdev_ops;
 548
 549         INIT_LIST_HEAD(&brdev->brvccs);
 550 }
 551
 552 static void br2684_setup_routed(struct net_device *netdev)
 553 {
 554         struct br2684_dev *brdev = BRPRIV(netdev);
 555         brdev->net_dev = netdev;
 556
 557         netdev->hard_header_len = 0;
 558
 559         netdev->netdev_ops = &br2684_netdev_ops;
 560         netdev->addr_len = 0;
 561         netdev->mtu = 1500;
 562         netdev->type = ARPHRD_PPP;
 563         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 564         netdev->tx_queue_len = 100;
 565         INIT_LIST_HEAD(&brdev->brvccs);
 566 }
 567
 568 static int br2684_create(void __user * arg)
 569 {
 570         int err;
 571         struct net_device *netdev;
 572         struct br2684_dev *brdev;
 573         struct atm_newif_br2684 ni;
 574         enum br2684_payload payload;
 575
 576         pr_debug("br2684_create\n");
 577
 578         if (copy_from_user(&ni, arg, sizeof ni)) {
 579                 return -EFAULT;
 580         }
 581
 582         if (ni.media & BR2684_FLAG_ROUTED)
 583                 payload = p_routed;
 584         else
 585                 payload = p_bridged;
 586         ni.media &= 0xffff;     /* strip flags */
 587
 588         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
 589                 return -EINVAL;
 590         }
 591
 592         netdev = alloc_netdev(sizeof(struct br2684_dev),
 593                               ni.ifname[0] ? ni.ifname : "nas%d",
 594                               (payload == p_routed) ?
 595                               br2684_setup_routed : br2684_setup);
 596         if (!netdev)
 597                 return -ENOMEM;
 598
 599         brdev = BRPRIV(netdev);
 600
 601         pr_debug("registered netdev %s\n", netdev->name);
 602         /* open, stop, do_ioctl ? */
 603         err = register_netdev(netdev);
 604         if (err < 0) {
 605                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
 606                 free_netdev(netdev);
 607                 return err;
 608         }
 609
 610         write_lock_irq(&devs_lock);
 611         brdev->payload = payload;
 612         brdev->number = list_empty(&br2684_devs) ? 1 :
 613             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 614         list_add_tail(&brdev->br2684_devs, &br2684_devs);
 615         write_unlock_irq(&devs_lock);
 616         return 0;
 617 }
 618
 619 /*
 620  * This handles ioctls actually performed on our vcc - we must return
 621  * -ENOIOCTLCMD for any unrecognized ioctl
 622  */
 623 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
 624                         unsigned long arg)
 625 {
 626         struct atm_vcc *atmvcc = ATM_SD(sock);
 627         void __user *argp = (void __user *)arg;
 628         atm_backend_t b;
 629
 630         int err;
 631         switch (cmd) {
 632         case ATM_SETBACKEND:
 633         case ATM_NEWBACKENDIF:
 634                 err = get_user(b, (atm_backend_t __user *) argp);
 635                 if (err)
 636                         return -EFAULT;
 637                 if (b != ATM_BACKEND_BR2684)
 638                         return -ENOIOCTLCMD;
 639                 if (!capable(CAP_NET_ADMIN))
 640                         return -EPERM;
 641                 if (cmd == ATM_SETBACKEND)
 642                         return br2684_regvcc(atmvcc, argp);
 643                 else
 644                         return br2684_create(argp);
 645 #ifdef CONFIG_ATM_BR2684_IPFILTER
 646         case BR2684_SETFILT:
 647                 if (atmvcc->push != br2684_push)
 648                         return -ENOIOCTLCMD;
 649                 if (!capable(CAP_NET_ADMIN))
 650                         return -EPERM;
 651                 err = br2684_setfilt(atmvcc, argp);
 652
 653                 return err;
 654 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 655         }
 656         return -ENOIOCTLCMD;
 657 }
 658
 659 static struct atm_ioctl br2684_ioctl_ops = {
 660         .owner = THIS_MODULE,
 661         .ioctl = br2684_ioctl,
 662 };
 663
 664 #ifdef CONFIG_PROC_FS
 665 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
 666         __acquires(devs_lock)
 667 {
 668         read_lock(&devs_lock);
 669         return seq_list_start(&br2684_devs, *pos);
 670 }
 671
 672 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
 673 {
 674         return seq_list_next(v, &br2684_devs, pos);
 675 }
 676
 677 static void br2684_seq_stop(struct seq_file *seq, void *v)
 678         __releases(devs_lock)
 679 {
 680         read_unlock(&devs_lock);
 681 }
 682
 683 static int br2684_seq_show(struct seq_file *seq, void *v)
 684 {
 685         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
 686                                                     br2684_devs);
 687         const struct net_device *net_dev = brdev->net_dev;
 688         const struct br2684_vcc *brvcc;
 689
 690         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
 691                    net_dev->name,
 692                    brdev->number,
 693                    net_dev->dev_addr,
 694                    brdev->mac_was_set ? "set" : "auto");
 695
 696         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 697                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
 698                            ", failed copies %u/%u"
 699                            "\n", brvcc->atmvcc->dev->number,
 700                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 701                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
 702                            (brdev->payload == p_bridged) ? "bridged" : "routed",
 703                            brvcc->copies_failed, brvcc->copies_needed);
 704 #ifdef CONFIG_ATM_BR2684_IPFILTER
 705 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 706 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 707                 if (brvcc->filter.netmask != 0)
 708                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
 709                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
 710 #undef bs
 711 #undef b1
 712 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 713         }
 714         return 0;
 715 }
 716
 717 static const struct seq_operations br2684_seq_ops = {
 718         .start = br2684_seq_start,
 719         .next = br2684_seq_next,
 720         .stop = br2684_seq_stop,
 721         .show = br2684_seq_show,
 722 };
 723
 724 static int br2684_proc_open(struct inode *inode, struct file *file)
 725 {
 726         return seq_open(file, &br2684_seq_ops);
 727 }
 728
 729 static const struct file_operations br2684_proc_ops = {
 730         .owner = THIS_MODULE,
 731         .open = br2684_proc_open,
 732         .read = seq_read,
 733         .llseek = seq_lseek,
 734         .release = seq_release,
 735 };
 736
 737 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 738 #endif /* CONFIG_PROC_FS */
 739
 740 static int __init br2684_init(void)
 741 {
 742 #ifdef CONFIG_PROC_FS
 743         struct proc_dir_entry *p;
 744         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
 745         if (p == NULL)
 746                 return -ENOMEM;
 747 #endif
 748         register_atm_ioctl(&br2684_ioctl_ops);
 749         return 0;
 750 }
 751
 752 static void __exit br2684_exit(void)
 753 {
 754         struct net_device *net_dev;
 755         struct br2684_dev *brdev;
 756         struct br2684_vcc *brvcc;
 757         deregister_atm_ioctl(&br2684_ioctl_ops);
 758
 759 #ifdef CONFIG_PROC_FS
 760         remove_proc_entry("br2684", atm_proc_root);
 761 #endif
 762
 763         while (!list_empty(&br2684_devs)) {
 764                 net_dev = list_entry_brdev(br2684_devs.next);
 765                 brdev = BRPRIV(net_dev);
 766                 while (!list_empty(&brdev->brvccs)) {
 767                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 768                         br2684_close_vcc(brvcc);
 769                 }
 770
 771                 list_del(&brdev->br2684_devs);
 772                 unregister_netdev(net_dev);
 773                 free_netdev(net_dev);
 774         }
 775 }
 776
 777 module_init(br2684_init);
 778 module_exit(br2684_exit);
 779
 780 MODULE_AUTHOR("Marcell GAL");
 781 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 782 MODULE_LICENSE("GPL");