net/atm/br2684.c

   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 /* chained vcc->pop function.  Check if we should wake the netif_queue */
 146 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 147 {
 148         struct br2684_vcc *brvcc = BR2684_VCC(vcc);
 149         struct net_device *net_dev = skb->dev;
 150
 151         pr_debug("br2684_pop(vcc %p ; net_dev %p )\n", vcc, net_dev);
 152         brvcc->old_pop(vcc, skb);
 153
 154         if (!net_dev)
 155                 return;
 156
 157         if (atm_may_send(vcc, 0))
 158                 netif_wake_queue(net_dev);
 159
 160 }
 161 /*
 162  * Send a packet out a particular vcc.  Not to useful right now, but paves
 163  * the way for multiple vcc's per itf.  Returns true if we can send,
 164  * otherwise false
 165  */
 166 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
 167                            struct br2684_vcc *brvcc)
 168 {
 169         struct br2684_dev *brdev = BRPRIV(dev);
 170         struct atm_vcc *atmvcc;
 171         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
 172
 173         if (skb_headroom(skb) < minheadroom) {
 174                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
 175                 brvcc->copies_needed++;
 176                 dev_kfree_skb(skb);
 177                 if (skb2 == NULL) {
 178                         brvcc->copies_failed++;
 179                         return 0;
 180                 }
 181                 skb = skb2;
 182         }
 183
 184         if (brvcc->encaps == e_llc) {
 185                 if (brdev->payload == p_bridged) {
 186                         skb_push(skb, sizeof(llc_oui_pid_pad));
 187                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
 188                                                 sizeof(llc_oui_pid_pad));
 189                 } else if (brdev->payload == p_routed) {
 190                         unsigned short prot = ntohs(skb->protocol);
 191
 192                         skb_push(skb, sizeof(llc_oui_ipv4));
 193                         switch (prot) {
 194                         case ETH_P_IP:
 195                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
 196                                                         sizeof(llc_oui_ipv4));
 197                                 break;
 198                         case ETH_P_IPV6:
 199                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
 200                                                         sizeof(llc_oui_ipv6));
 201                                 break;
 202                         default:
 203                                 dev_kfree_skb(skb);
 204                                 return 0;
 205                         }
 206                 }
 207         } else { /* e_vc */
 208                 if (brdev->payload == p_bridged) {
 209                         skb_push(skb, 2);
 210                         memset(skb->data, 0, 2);
 211                 }
 212         }
 213         skb_debug(skb);
 214
 215         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 216         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 217         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 218         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 219         dev->stats.tx_packets++;
 220         dev->stats.tx_bytes += skb->len;
 221         atmvcc->send(atmvcc, skb);
 222
 223         if (!atm_may_send(atmvcc, 0)) {
 224                 netif_stop_queue(brvcc->device);
 225                 /*check for race with br2684_pop*/
 226                 if (atm_may_send(atmvcc, 0))
 227                         netif_start_queue(brvcc->device);
 228         }
 229
 230         return 1;
 231 }
 232
 233 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
 234                                                    const struct br2684_dev *brdev)
 235 {
 236         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
 237 }
 238
 239 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
 240                                      struct net_device *dev)
 241 {
 242         struct br2684_dev *brdev = BRPRIV(dev);
 243         struct br2684_vcc *brvcc;
 244
 245         pr_debug("br2684_start_xmit, skb_dst(skb)=%p\n", skb_dst(skb));
 246         read_lock(&devs_lock);
 247         brvcc = pick_outgoing_vcc(skb, brdev);
 248         if (brvcc == NULL) {
 249                 pr_debug("no vcc attached to dev %s\n", dev->name);
 250                 dev->stats.tx_errors++;
 251                 dev->stats.tx_carrier_errors++;
 252                 /* netif_stop_queue(dev); */
 253                 dev_kfree_skb(skb);
 254                 read_unlock(&devs_lock);
 255                 return NETDEV_TX_OK;
 256         }
 257         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
 258                 /*
 259                  * We should probably use netif_*_queue() here, but that
 260                  * involves added complication.  We need to walk before
 261                  * we can run.
 262                  *
 263                  * Don't free here! this pointer might be no longer valid!
 264                  */
 265                 dev->stats.tx_errors++;
 266                 dev->stats.tx_fifo_errors++;
 267         }
 268         read_unlock(&devs_lock);
 269         return NETDEV_TX_OK;
 270 }
 271
 272 /*
 273  * We remember when the MAC gets set, so we don't override it later with
 274  * the ESI of the ATM card of the first VC
 275  */
 276 static int br2684_mac_addr(struct net_device *dev, void *p)
 277 {
 278         int err = eth_mac_addr(dev, p);
 279         if (!err)
 280                 BRPRIV(dev)->mac_was_set = 1;
 281         return err;
 282 }
 283
 284 #ifdef CONFIG_ATM_BR2684_IPFILTER
 285 /* this IOCTL is experimental. */
 286 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 287 {
 288         struct br2684_vcc *brvcc;
 289         struct br2684_filter_set fs;
 290
 291         if (copy_from_user(&fs, arg, sizeof fs))
 292                 return -EFAULT;
 293         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 294                 /*
 295                  * This is really a per-vcc thing, but we can also search
 296                  * by device.
 297                  */
 298                 struct br2684_dev *brdev;
 299                 read_lock(&devs_lock);
 300                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 301                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
 302                         brvcc = NULL;
 303                 else
 304                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 305                 read_unlock(&devs_lock);
 306                 if (brvcc == NULL)
 307                         return -ESRCH;
 308         } else
 309                 brvcc = BR2684_VCC(atmvcc);
 310         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 311         return 0;
 312 }
 313
 314 /* Returns 1 if packet should be dropped */
 315 static inline int
 316 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 317 {
 318         if (brvcc->filter.netmask == 0)
 319                 return 0;       /* no filter in place */
 320         if (type == htons(ETH_P_IP) &&
 321             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
 322              netmask) == brvcc->filter.prefix)
 323                 return 0;
 324         if (type == htons(ETH_P_ARP))
 325                 return 0;
 326         /*
 327          * TODO: we should probably filter ARPs too.. don't want to have
 328          * them returning values that don't make sense, or is that ok?
 329          */
 330         return 1;               /* drop */
 331 }
 332 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 333
 334 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 335 {
 336         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 337         write_lock_irq(&devs_lock);
 338         list_del(&brvcc->brvccs);
 339         write_unlock_irq(&devs_lock);
 340         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 341         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 342         kfree(brvcc);
 343         module_put(THIS_MODULE);
 344 }
 345
 346 /* when AAL5 PDU comes in: */
 347 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 348 {
 349         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 350         struct net_device *net_dev = brvcc->device;
 351         struct br2684_dev *brdev = BRPRIV(net_dev);
 352
 353         pr_debug("br2684_push\n");
 354
 355         if (unlikely(skb == NULL)) {
 356                 /* skb==NULL means VCC is being destroyed */
 357                 br2684_close_vcc(brvcc);
 358                 if (list_empty(&brdev->brvccs)) {
 359                         write_lock_irq(&devs_lock);
 360                         list_del(&brdev->br2684_devs);
 361                         write_unlock_irq(&devs_lock);
 362                         unregister_netdev(net_dev);
 363                         free_netdev(net_dev);
 364                 }
 365                 return;
 366         }
 367
 368         skb_debug(skb);
 369         atm_return(atmvcc, skb->truesize);
 370         pr_debug("skb from brdev %p\n", brdev);
 371         if (brvcc->encaps == e_llc) {
 372
 373                 if (skb->len > 7 && skb->data[7] == 0x01)
 374                         __skb_trim(skb, skb->len - 4);
 375
 376                 /* accept packets that have "ipv[46]" in the snap header */
 377                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
 378                     &&
 379                     (memcmp
 380                      (skb->data, llc_oui_ipv4,
 381                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
 382                         if (memcmp
 383                             (skb->data + 6, ethertype_ipv6,
 384                              sizeof(ethertype_ipv6)) == 0)
 385                                 skb->protocol = htons(ETH_P_IPV6);
 386                         else if (memcmp
 387                                  (skb->data + 6, ethertype_ipv4,
 388                                   sizeof(ethertype_ipv4)) == 0)
 389                                 skb->protocol = htons(ETH_P_IP);
 390                         else
 391                                 goto error;
 392                         skb_pull(skb, sizeof(llc_oui_ipv4));
 393                         skb_reset_network_header(skb);
 394                         skb->pkt_type = PACKET_HOST;
 395                         /*
 396                          * Let us waste some time for checking the encapsulation.
 397                          * Note, that only 7 char is checked so frames with a valid FCS
 398                          * are also accepted (but FCS is not checked of course).
 399                          */
 400                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
 401                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
 402                         skb_pull(skb, sizeof(llc_oui_pid_pad));
 403                         skb->protocol = eth_type_trans(skb, net_dev);
 404                 } else
 405                         goto error;
 406
 407         } else { /* e_vc */
 408                 if (brdev->payload == p_routed) {
 409                         struct iphdr *iph;
 410
 411                         skb_reset_network_header(skb);
 412                         iph = ip_hdr(skb);
 413                         if (iph->version == 4)
 414                                 skb->protocol = htons(ETH_P_IP);
 415                         else if (iph->version == 6)
 416                                 skb->protocol = htons(ETH_P_IPV6);
 417                         else
 418                                 goto error;
 419                         skb->pkt_type = PACKET_HOST;
 420                 } else { /* p_bridged */
 421                         /* first 2 chars should be 0 */
 422                         if (*((u16 *) (skb->data)) != 0)
 423                                 goto error;
 424                         skb_pull(skb, BR2684_PAD_LEN);
 425                         skb->protocol = eth_type_trans(skb, net_dev);
 426                 }
 427         }
 428
 429 #ifdef CONFIG_ATM_BR2684_IPFILTER
 430         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
 431                 goto dropped;
 432 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 433         skb->dev = net_dev;
 434         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 435         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
 436         skb_debug(skb);
 437         /* sigh, interface is down? */
 438         if (unlikely(!(net_dev->flags & IFF_UP)))
 439                 goto dropped;
 440         net_dev->stats.rx_packets++;
 441         net_dev->stats.rx_bytes += skb->len;
 442         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 443         netif_rx(skb);
 444         return;
 445
 446 dropped:
 447         net_dev->stats.rx_dropped++;
 448         goto free_skb;
 449 error:
 450         net_dev->stats.rx_errors++;
 451 free_skb:
 452         dev_kfree_skb(skb);
 453         return;
 454 }
 455
 456 /*
 457  * Assign a vcc to a dev
 458  * Note: we do not have explicit unassign, but look at _push()
 459  */
 460 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
 461 {
 462         struct sk_buff_head queue;
 463         int err;
 464         struct br2684_vcc *brvcc;
 465         struct sk_buff *skb, *tmp;
 466         struct sk_buff_head *rq;
 467         struct br2684_dev *brdev;
 468         struct net_device *net_dev;
 469         struct atm_backend_br2684 be;
 470         unsigned long flags;
 471
 472         if (copy_from_user(&be, arg, sizeof be))
 473                 return -EFAULT;
 474         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 475         if (!brvcc)
 476                 return -ENOMEM;
 477         write_lock_irq(&devs_lock);
 478         net_dev = br2684_find_dev(&be.ifspec);
 479         if (net_dev == NULL) {
 480                 printk(KERN_ERR
 481                        "br2684: tried to attach to non-existant device\n");
 482                 err = -ENXIO;
 483                 goto error;
 484         }
 485         brdev = BRPRIV(net_dev);
 486         if (atmvcc->push == NULL) {
 487                 err = -EBADFD;
 488                 goto error;
 489         }
 490         if (!list_empty(&brdev->brvccs)) {
 491                 /* Only 1 VCC/dev right now */
 492                 err = -EEXIST;
 493                 goto error;
 494         }
 495         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
 496             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
 497                                                                BR2684_ENCAPS_VC
 498                                                                && be.encaps !=
 499                                                                BR2684_ENCAPS_LLC)
 500             || be.min_size != 0) {
 501                 err = -EINVAL;
 502                 goto error;
 503         }
 504         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
 505                  be.encaps, brvcc);
 506         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 507                 unsigned char *esi = atmvcc->dev->esi;
 508                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 509                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 510                 else
 511                         net_dev->dev_addr[2] = 1;
 512         }
 513         list_add(&brvcc->brvccs, &brdev->brvccs);
 514         write_unlock_irq(&devs_lock);
 515         brvcc->device = net_dev;
 516         brvcc->atmvcc = atmvcc;
 517         atmvcc->user_back = brvcc;
 518         brvcc->encaps = (enum br2684_encaps)be.encaps;
 519         brvcc->old_push = atmvcc->push;
 520         brvcc->old_pop = atmvcc->pop;
 521         barrier();
 522         atmvcc->push = br2684_push;
 523         atmvcc->pop = br2684_pop;
 524
 525         __skb_queue_head_init(&queue);
 526         rq = &sk_atm(atmvcc)->sk_receive_queue;
 527
 528         spin_lock_irqsave(&rq->lock, flags);
 529         skb_queue_splice_init(rq, &queue);
 530         spin_unlock_irqrestore(&rq->lock, flags);
 531
 532         skb_queue_walk_safe(&queue, skb, tmp) {
 533                 struct net_device *dev;
 534
 535                 br2684_push(atmvcc, skb);
 536                 dev = skb->dev;
 537
 538                 dev->stats.rx_bytes -= skb->len;
 539                 dev->stats.rx_packets--;
 540         }
 541         __module_get(THIS_MODULE);
 542         return 0;
 543       error:
 544         write_unlock_irq(&devs_lock);
 545         kfree(brvcc);
 546         return err;
 547 }
 548
 549 static const struct net_device_ops br2684_netdev_ops = {
 550         .ndo_start_xmit         = br2684_start_xmit,
 551         .ndo_set_mac_address    = br2684_mac_addr,
 552         .ndo_change_mtu         = eth_change_mtu,
 553         .ndo_validate_addr      = eth_validate_addr,
 554 };
 555
 556 static const struct net_device_ops br2684_netdev_ops_routed = {
 557         .ndo_start_xmit         = br2684_start_xmit,
 558         .ndo_set_mac_address    = br2684_mac_addr,
 559         .ndo_change_mtu         = eth_change_mtu
 560 };
 561
 562 static void br2684_setup(struct net_device *netdev)
 563 {
 564         struct br2684_dev *brdev = BRPRIV(netdev);
 565
 566         ether_setup(netdev);
 567         brdev->net_dev = netdev;
 568
 569         netdev->netdev_ops = &br2684_netdev_ops;
 570
 571         INIT_LIST_HEAD(&brdev->brvccs);
 572 }
 573
 574 static void br2684_setup_routed(struct net_device *netdev)
 575 {
 576         struct br2684_dev *brdev = BRPRIV(netdev);
 577
 578         brdev->net_dev = netdev;
 579         netdev->hard_header_len = 0;
 580         netdev->netdev_ops = &br2684_netdev_ops_routed;
 581         netdev->addr_len = 0;
 582         netdev->mtu = 1500;
 583         netdev->type = ARPHRD_PPP;
 584         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 585         netdev->tx_queue_len = 100;
 586         INIT_LIST_HEAD(&brdev->brvccs);
 587 }
 588
 589 static int br2684_create(void __user * arg)
 590 {
 591         int err;
 592         struct net_device *netdev;
 593         struct br2684_dev *brdev;
 594         struct atm_newif_br2684 ni;
 595         enum br2684_payload payload;
 596
 597         pr_debug("br2684_create\n");
 598
 599         if (copy_from_user(&ni, arg, sizeof ni)) {
 600                 return -EFAULT;
 601         }
 602
 603         if (ni.media & BR2684_FLAG_ROUTED)
 604                 payload = p_routed;
 605         else
 606                 payload = p_bridged;
 607         ni.media &= 0xffff;     /* strip flags */
 608
 609         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
 610                 return -EINVAL;
 611         }
 612
 613         netdev = alloc_netdev(sizeof(struct br2684_dev),
 614                               ni.ifname[0] ? ni.ifname : "nas%d",
 615                               (payload == p_routed) ?
 616                               br2684_setup_routed : br2684_setup);
 617         if (!netdev)
 618                 return -ENOMEM;
 619
 620         brdev = BRPRIV(netdev);
 621
 622         pr_debug("registered netdev %s\n", netdev->name);
 623         /* open, stop, do_ioctl ? */
 624         err = register_netdev(netdev);
 625         if (err < 0) {
 626                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
 627                 free_netdev(netdev);
 628                 return err;
 629         }
 630
 631         write_lock_irq(&devs_lock);
 632         brdev->payload = payload;
 633         brdev->number = list_empty(&br2684_devs) ? 1 :
 634             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 635         list_add_tail(&brdev->br2684_devs, &br2684_devs);
 636         write_unlock_irq(&devs_lock);
 637         return 0;
 638 }
 639
 640 /*
 641  * This handles ioctls actually performed on our vcc - we must return
 642  * -ENOIOCTLCMD for any unrecognized ioctl
 643  */
 644 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
 645                         unsigned long arg)
 646 {
 647         struct atm_vcc *atmvcc = ATM_SD(sock);
 648         void __user *argp = (void __user *)arg;
 649         atm_backend_t b;
 650
 651         int err;
 652         switch (cmd) {
 653         case ATM_SETBACKEND:
 654         case ATM_NEWBACKENDIF:
 655                 err = get_user(b, (atm_backend_t __user *) argp);
 656                 if (err)
 657                         return -EFAULT;
 658                 if (b != ATM_BACKEND_BR2684)
 659                         return -ENOIOCTLCMD;
 660                 if (!capable(CAP_NET_ADMIN))
 661                         return -EPERM;
 662                 if (cmd == ATM_SETBACKEND)
 663                         return br2684_regvcc(atmvcc, argp);
 664                 else
 665                         return br2684_create(argp);
 666 #ifdef CONFIG_ATM_BR2684_IPFILTER
 667         case BR2684_SETFILT:
 668                 if (atmvcc->push != br2684_push)
 669                         return -ENOIOCTLCMD;
 670                 if (!capable(CAP_NET_ADMIN))
 671                         return -EPERM;
 672                 err = br2684_setfilt(atmvcc, argp);
 673
 674                 return err;
 675 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 676         }
 677         return -ENOIOCTLCMD;
 678 }
 679
 680 static struct atm_ioctl br2684_ioctl_ops = {
 681         .owner = THIS_MODULE,
 682         .ioctl = br2684_ioctl,
 683 };
 684
 685 #ifdef CONFIG_PROC_FS
 686 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
 687         __acquires(devs_lock)
 688 {
 689         read_lock(&devs_lock);
 690         return seq_list_start(&br2684_devs, *pos);
 691 }
 692
 693 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
 694 {
 695         return seq_list_next(v, &br2684_devs, pos);
 696 }
 697
 698 static void br2684_seq_stop(struct seq_file *seq, void *v)
 699         __releases(devs_lock)
 700 {
 701         read_unlock(&devs_lock);
 702 }
 703
 704 static int br2684_seq_show(struct seq_file *seq, void *v)
 705 {
 706         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
 707                                                     br2684_devs);
 708         const struct net_device *net_dev = brdev->net_dev;
 709         const struct br2684_vcc *brvcc;
 710
 711         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
 712                    net_dev->name,
 713                    brdev->number,
 714                    net_dev->dev_addr,
 715                    brdev->mac_was_set ? "set" : "auto");
 716
 717         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 718                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
 719                            ", failed copies %u/%u"
 720                            "\n", brvcc->atmvcc->dev->number,
 721                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 722                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
 723                            (brdev->payload == p_bridged) ? "bridged" : "routed",
 724                            brvcc->copies_failed, brvcc->copies_needed);
 725 #ifdef CONFIG_ATM_BR2684_IPFILTER
 726 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 727 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 728                 if (brvcc->filter.netmask != 0)
 729                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
 730                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
 731 #undef bs
 732 #undef b1
 733 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 734         }
 735         return 0;
 736 }
 737
 738 static const struct seq_operations br2684_seq_ops = {
 739         .start = br2684_seq_start,
 740         .next = br2684_seq_next,
 741         .stop = br2684_seq_stop,
 742         .show = br2684_seq_show,
 743 };
 744
 745 static int br2684_proc_open(struct inode *inode, struct file *file)
 746 {
 747         return seq_open(file, &br2684_seq_ops);
 748 }
 749
 750 static const struct file_operations br2684_proc_ops = {
 751         .owner = THIS_MODULE,
 752         .open = br2684_proc_open,
 753         .read = seq_read,
 754         .llseek = seq_lseek,
 755         .release = seq_release,
 756 };
 757
 758 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 759 #endif /* CONFIG_PROC_FS */
 760
 761 static int __init br2684_init(void)
 762 {
 763 #ifdef CONFIG_PROC_FS
 764         struct proc_dir_entry *p;
 765         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
 766         if (p == NULL)
 767                 return -ENOMEM;
 768 #endif
 769         register_atm_ioctl(&br2684_ioctl_ops);
 770         return 0;
 771 }
 772
 773 static void __exit br2684_exit(void)
 774 {
 775         struct net_device *net_dev;
 776         struct br2684_dev *brdev;
 777         struct br2684_vcc *brvcc;
 778         deregister_atm_ioctl(&br2684_ioctl_ops);
 779
 780 #ifdef CONFIG_PROC_FS
 781         remove_proc_entry("br2684", atm_proc_root);
 782 #endif
 783
 784         while (!list_empty(&br2684_devs)) {
 785                 net_dev = list_entry_brdev(br2684_devs.next);
 786                 brdev = BRPRIV(net_dev);
 787                 while (!list_empty(&brdev->brvccs)) {
 788                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 789                         br2684_close_vcc(brvcc);
 790                 }
 791
 792                 list_del(&brdev->br2684_devs);
 793                 unregister_netdev(net_dev);
 794                 free_netdev(net_dev);
 795         }
 796 }
 797
 798 module_init(br2684_init);
 799 module_exit(br2684_exit);
 800
 801 MODULE_AUTHOR("Marcell GAL");
 802 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 803 MODULE_LICENSE("GPL");