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 unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
  56 static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
  57 static unsigned char llc_oui_pid_pad[] =
  58                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
  59 static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
  60 static 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         struct net_device_stats stats;
  87         int mac_was_set;
  88         enum br2684_payload payload;
  89 };
  90
  91 /*
  92  * This lock should be held for writing any time the list of devices or
  93  * their attached vcc's could be altered.  It should be held for reading
  94  * any time these are being queried.  Note that we sometimes need to
  95  * do read-locking under interrupt context, so write locking must block
  96  * the current CPU's interrupts
  97  */
  98 static DEFINE_RWLOCK(devs_lock);
  99
 100 static LIST_HEAD(br2684_devs);
 101
 102 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
 103 {
 104         return (struct br2684_dev *)net_dev->priv;
 105 }
 106
 107 static inline struct net_device *list_entry_brdev(const struct list_head *le)
 108 {
 109         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
 110 }
 111
 112 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
 113 {
 114         return (struct br2684_vcc *)(atmvcc->user_back);
 115 }
 116
 117 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
 118 {
 119         return list_entry(le, struct br2684_vcc, brvccs);
 120 }
 121
 122 /* Caller should hold read_lock(&devs_lock) */
 123 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
 124 {
 125         struct list_head *lh;
 126         struct net_device *net_dev;
 127         switch (s->method) {
 128         case BR2684_FIND_BYNUM:
 129                 list_for_each(lh, &br2684_devs) {
 130                         net_dev = list_entry_brdev(lh);
 131                         if (BRPRIV(net_dev)->number == s->spec.devnum)
 132                                 return net_dev;
 133                 }
 134                 break;
 135         case BR2684_FIND_BYIFNAME:
 136                 list_for_each(lh, &br2684_devs) {
 137                         net_dev = list_entry_brdev(lh);
 138                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
 139                                 return net_dev;
 140                 }
 141                 break;
 142         }
 143         return NULL;
 144 }
 145
 146 /*
 147  * Send a packet out a particular vcc.  Not to useful right now, but paves
 148  * the way for multiple vcc's per itf.  Returns true if we can send,
 149  * otherwise false
 150  */
 151 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
 152                            struct br2684_vcc *brvcc)
 153 {
 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 {
 192                 skb_push(skb, 2);
 193                 if (brdev->payload == p_bridged)
 194                         memset(skb->data, 0, 2);
 195         }
 196         skb_debug(skb);
 197
 198         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 199         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 200         if (!atm_may_send(atmvcc, skb->truesize)) {
 201                 /*
 202                  * We free this here for now, because we cannot know in a higher
 203                  * layer whether the skb pointer it supplied wasn't freed yet.
 204                  * Now, it always is.
 205                  */
 206                 dev_kfree_skb(skb);
 207                 return 0;
 208         }
 209         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 210         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 211         brdev->stats.tx_packets++;
 212         brdev->stats.tx_bytes += skb->len;
 213         atmvcc->send(atmvcc, skb);
 214         return 1;
 215 }
 216
 217 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
 218                                                    struct br2684_dev *brdev)
 219 {
 220         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
 221 }
 222
 223 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
 224 {
 225         struct br2684_dev *brdev = BRPRIV(dev);
 226         struct br2684_vcc *brvcc;
 227
 228         pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
 229         read_lock(&devs_lock);
 230         brvcc = pick_outgoing_vcc(skb, brdev);
 231         if (brvcc == NULL) {
 232                 pr_debug("no vcc attached to dev %s\n", dev->name);
 233                 brdev->stats.tx_errors++;
 234                 brdev->stats.tx_carrier_errors++;
 235                 /* netif_stop_queue(dev); */
 236                 dev_kfree_skb(skb);
 237                 read_unlock(&devs_lock);
 238                 return 0;
 239         }
 240         if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
 241                 /*
 242                  * We should probably use netif_*_queue() here, but that
 243                  * involves added complication.  We need to walk before
 244                  * we can run.
 245                  *
 246                  * Don't free here! this pointer might be no longer valid!
 247                  */
 248                 brdev->stats.tx_errors++;
 249                 brdev->stats.tx_fifo_errors++;
 250         }
 251         read_unlock(&devs_lock);
 252         return 0;
 253 }
 254
 255 static struct net_device_stats *br2684_get_stats(struct net_device *dev)
 256 {
 257         pr_debug("br2684_get_stats\n");
 258         return &BRPRIV(dev)->stats;
 259 }
 260
 261 /*
 262  * We remember when the MAC gets set, so we don't override it later with
 263  * the ESI of the ATM card of the first VC
 264  */
 265 static int (*my_eth_mac_addr) (struct net_device *, void *);
 266 static int br2684_mac_addr(struct net_device *dev, void *p)
 267 {
 268         int err = my_eth_mac_addr(dev, p);
 269         if (!err)
 270                 BRPRIV(dev)->mac_was_set = 1;
 271         return err;
 272 }
 273
 274 #ifdef CONFIG_ATM_BR2684_IPFILTER
 275 /* this IOCTL is experimental. */
 276 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 277 {
 278         struct br2684_vcc *brvcc;
 279         struct br2684_filter_set fs;
 280
 281         if (copy_from_user(&fs, arg, sizeof fs))
 282                 return -EFAULT;
 283         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 284                 /*
 285                  * This is really a per-vcc thing, but we can also search
 286                  * by device.
 287                  */
 288                 struct br2684_dev *brdev;
 289                 read_lock(&devs_lock);
 290                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 291                 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev)    /* >1 VCC */
 292                         brvcc = NULL;
 293                 else
 294                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 295                 read_unlock(&devs_lock);
 296                 if (brvcc == NULL)
 297                         return -ESRCH;
 298         } else
 299                 brvcc = BR2684_VCC(atmvcc);
 300         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 301         return 0;
 302 }
 303
 304 /* Returns 1 if packet should be dropped */
 305 static inline int
 306 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 307 {
 308         if (brvcc->filter.netmask == 0)
 309                 return 0;       /* no filter in place */
 310         if (type == htons(ETH_P_IP) &&
 311             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
 312              netmask) == brvcc->filter.prefix)
 313                 return 0;
 314         if (type == htons(ETH_P_ARP))
 315                 return 0;
 316         /*
 317          * TODO: we should probably filter ARPs too.. don't want to have
 318          * them returning values that don't make sense, or is that ok?
 319          */
 320         return 1;               /* drop */
 321 }
 322 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 323
 324 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 325 {
 326         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 327         write_lock_irq(&devs_lock);
 328         list_del(&brvcc->brvccs);
 329         write_unlock_irq(&devs_lock);
 330         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 331         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 332         kfree(brvcc);
 333         module_put(THIS_MODULE);
 334 }
 335
 336 /* when AAL5 PDU comes in: */
 337 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 338 {
 339         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 340         struct net_device *net_dev = brvcc->device;
 341         struct br2684_dev *brdev = BRPRIV(net_dev);
 342
 343         pr_debug("br2684_push\n");
 344
 345         if (unlikely(skb == NULL)) {
 346                 /* skb==NULL means VCC is being destroyed */
 347                 br2684_close_vcc(brvcc);
 348                 if (list_empty(&brdev->brvccs)) {
 349                         read_lock(&devs_lock);
 350                         list_del(&brdev->br2684_devs);
 351                         read_unlock(&devs_lock);
 352                         unregister_netdev(net_dev);
 353                         free_netdev(net_dev);
 354                 }
 355                 return;
 356         }
 357
 358         skb_debug(skb);
 359         atm_return(atmvcc, skb->truesize);
 360         pr_debug("skb from brdev %p\n", brdev);
 361         if (brvcc->encaps == e_llc) {
 362
 363                 if (skb->len > 7 && skb->data[7] == 0x01)
 364                         __skb_trim(skb, skb->len - 4);
 365
 366                 /* accept packets that have "ipv[46]" in the snap header */
 367                 if ((skb->len >= (sizeof(llc_oui_ipv4)))
 368                     &&
 369                     (memcmp
 370                      (skb->data, llc_oui_ipv4,
 371                       sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
 372                         if (memcmp
 373                             (skb->data + 6, ethertype_ipv6,
 374                              sizeof(ethertype_ipv6)) == 0)
 375                                 skb->protocol = __constant_htons(ETH_P_IPV6);
 376                         else if (memcmp
 377                                  (skb->data + 6, ethertype_ipv4,
 378                                   sizeof(ethertype_ipv4)) == 0)
 379                                 skb->protocol = __constant_htons(ETH_P_IP);
 380                         else {
 381                                 brdev->stats.rx_errors++;
 382                                 dev_kfree_skb(skb);
 383                                 return;
 384                         }
 385                         skb_pull(skb, sizeof(llc_oui_ipv4));
 386                         skb_reset_network_header(skb);
 387                         skb->pkt_type = PACKET_HOST;
 388                         /*
 389                          * Let us waste some time for checking the encapsulation.
 390                          * Note, that only 7 char is checked so frames with a valid FCS
 391                          * are also accepted (but FCS is not checked of course).
 392                          */
 393                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
 394                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
 395                         skb_pull(skb, sizeof(llc_oui_pid_pad));
 396                         skb->protocol = eth_type_trans(skb, net_dev);
 397                 } else {
 398                         brdev->stats.rx_errors++;
 399                         dev_kfree_skb(skb);
 400                         return;
 401                 }
 402
 403         } else {
 404                 /* first 2 chars should be 0 */
 405                 if (*((u16 *) (skb->data)) != 0) {
 406                         brdev->stats.rx_errors++;
 407                         dev_kfree_skb(skb);
 408                         return;
 409                 }
 410                 skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN);       /* pad, dstmac, srcmac, ethtype */
 411                 skb->protocol = eth_type_trans(skb, net_dev);
 412         }
 413
 414 #ifdef CONFIG_ATM_BR2684_IPFILTER
 415         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
 416                 brdev->stats.rx_dropped++;
 417                 dev_kfree_skb(skb);
 418                 return;
 419         }
 420 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 421         skb->dev = net_dev;
 422         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 423         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
 424         skb_debug(skb);
 425         if (unlikely(!(net_dev->flags & IFF_UP))) {
 426                 /* sigh, interface is down */
 427                 brdev->stats.rx_dropped++;
 428                 dev_kfree_skb(skb);
 429                 return;
 430         }
 431         brdev->stats.rx_packets++;
 432         brdev->stats.rx_bytes += skb->len;
 433         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 434         netif_rx(skb);
 435 }
 436
 437 /*
 438  * Assign a vcc to a dev
 439  * Note: we do not have explicit unassign, but look at _push()
 440  */
 441 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
 442 {
 443         int err;
 444         struct br2684_vcc *brvcc;
 445         struct sk_buff *skb;
 446         struct sk_buff_head *rq;
 447         struct br2684_dev *brdev;
 448         struct net_device *net_dev;
 449         struct atm_backend_br2684 be;
 450         unsigned long flags;
 451
 452         if (copy_from_user(&be, arg, sizeof be))
 453                 return -EFAULT;
 454         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 455         if (!brvcc)
 456                 return -ENOMEM;
 457         write_lock_irq(&devs_lock);
 458         net_dev = br2684_find_dev(&be.ifspec);
 459         if (net_dev == NULL) {
 460                 printk(KERN_ERR
 461                        "br2684: tried to attach to non-existant device\n");
 462                 err = -ENXIO;
 463                 goto error;
 464         }
 465         brdev = BRPRIV(net_dev);
 466         if (atmvcc->push == NULL) {
 467                 err = -EBADFD;
 468                 goto error;
 469         }
 470         if (!list_empty(&brdev->brvccs)) {
 471                 /* Only 1 VCC/dev right now */
 472                 err = -EEXIST;
 473                 goto error;
 474         }
 475         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
 476             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
 477                                                                BR2684_ENCAPS_VC
 478                                                                && be.encaps !=
 479                                                                BR2684_ENCAPS_LLC)
 480             || be.min_size != 0) {
 481                 err = -EINVAL;
 482                 goto error;
 483         }
 484         pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
 485                  be.encaps, brvcc);
 486         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 487                 unsigned char *esi = atmvcc->dev->esi;
 488                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 489                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 490                 else
 491                         net_dev->dev_addr[2] = 1;
 492         }
 493         list_add(&brvcc->brvccs, &brdev->brvccs);
 494         write_unlock_irq(&devs_lock);
 495         brvcc->device = net_dev;
 496         brvcc->atmvcc = atmvcc;
 497         atmvcc->user_back = brvcc;
 498         brvcc->encaps = (enum br2684_encaps)be.encaps;
 499         brvcc->old_push = atmvcc->push;
 500         barrier();
 501         atmvcc->push = br2684_push;
 502
 503         rq = &sk_atm(atmvcc)->sk_receive_queue;
 504
 505         spin_lock_irqsave(&rq->lock, flags);
 506         if (skb_queue_empty(rq)) {
 507                 skb = NULL;
 508         } else {
 509                 /* NULL terminate the list.  */
 510                 rq->prev->next = NULL;
 511                 skb = rq->next;
 512         }
 513         rq->prev = rq->next = (struct sk_buff *)rq;
 514         rq->qlen = 0;
 515         spin_unlock_irqrestore(&rq->lock, flags);
 516
 517         while (skb) {
 518                 struct sk_buff *next = skb->next;
 519
 520                 skb->next = skb->prev = NULL;
 521                 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
 522                 BRPRIV(skb->dev)->stats.rx_packets--;
 523                 br2684_push(atmvcc, skb);
 524
 525                 skb = next;
 526         }
 527         __module_get(THIS_MODULE);
 528         return 0;
 529       error:
 530         write_unlock_irq(&devs_lock);
 531         kfree(brvcc);
 532         return err;
 533 }
 534
 535 static void br2684_setup(struct net_device *netdev)
 536 {
 537         struct br2684_dev *brdev = BRPRIV(netdev);
 538
 539         ether_setup(netdev);
 540         brdev->net_dev = netdev;
 541
 542         my_eth_mac_addr = netdev->set_mac_address;
 543         netdev->set_mac_address = br2684_mac_addr;
 544         netdev->hard_start_xmit = br2684_start_xmit;
 545         netdev->get_stats = br2684_get_stats;
 546
 547         INIT_LIST_HEAD(&brdev->brvccs);
 548 }
 549
 550 static void br2684_setup_routed(struct net_device *netdev)
 551 {
 552         struct br2684_dev *brdev = BRPRIV(netdev);
 553         brdev->net_dev = netdev;
 554
 555         netdev->hard_header_len = 0;
 556         my_eth_mac_addr = netdev->set_mac_address;
 557         netdev->set_mac_address = br2684_mac_addr;
 558         netdev->hard_start_xmit = br2684_start_xmit;
 559         netdev->get_stats = br2684_get_stats;
 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         DECLARE_MAC_BUF(mac);
 690
 691         seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
 692                    net_dev->name,
 693                    brdev->number,
 694                    print_mac(mac, net_dev->dev_addr),
 695                    brdev->mac_was_set ? "set" : "auto");
 696
 697         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 698                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
 699                            ", failed copies %u/%u"
 700                            "\n", brvcc->atmvcc->dev->number,
 701                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 702                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
 703                            (brdev->payload == p_bridged) ? "bridged" : "routed",
 704                            brvcc->copies_failed, brvcc->copies_needed);
 705 #ifdef CONFIG_ATM_BR2684_IPFILTER
 706 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 707 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 708                 if (brvcc->filter.netmask != 0)
 709                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
 710                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
 711 #undef bs
 712 #undef b1
 713 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 714         }
 715         return 0;
 716 }
 717
 718 static const struct seq_operations br2684_seq_ops = {
 719         .start = br2684_seq_start,
 720         .next = br2684_seq_next,
 721         .stop = br2684_seq_stop,
 722         .show = br2684_seq_show,
 723 };
 724
 725 static int br2684_proc_open(struct inode *inode, struct file *file)
 726 {
 727         return seq_open(file, &br2684_seq_ops);
 728 }
 729
 730 static const struct file_operations br2684_proc_ops = {
 731         .owner = THIS_MODULE,
 732         .open = br2684_proc_open,
 733         .read = seq_read,
 734         .llseek = seq_lseek,
 735         .release = seq_release,
 736 };
 737
 738 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 739 #endif /* CONFIG_PROC_FS */
 740
 741 static int __init br2684_init(void)
 742 {
 743 #ifdef CONFIG_PROC_FS
 744         struct proc_dir_entry *p;
 745         if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
 746                 return -ENOMEM;
 747         p->proc_fops = &br2684_proc_ops;
 748 #endif
 749         register_atm_ioctl(&br2684_ioctl_ops);
 750         return 0;
 751 }
 752
 753 static void __exit br2684_exit(void)
 754 {
 755         struct net_device *net_dev;
 756         struct br2684_dev *brdev;
 757         struct br2684_vcc *brvcc;
 758         deregister_atm_ioctl(&br2684_ioctl_ops);
 759
 760 #ifdef CONFIG_PROC_FS
 761         remove_proc_entry("br2684", atm_proc_root);
 762 #endif
 763
 764         while (!list_empty(&br2684_devs)) {
 765                 net_dev = list_entry_brdev(br2684_devs.next);
 766                 brdev = BRPRIV(net_dev);
 767                 while (!list_empty(&brdev->brvccs)) {
 768                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 769                         br2684_close_vcc(brvcc);
 770                 }
 771
 772                 list_del(&brdev->br2684_devs);
 773                 unregister_netdev(net_dev);
 774                 free_netdev(net_dev);
 775         }
 776 }
 777
 778 module_init(br2684_init);
 779 module_exit(br2684_exit);
 780
 781 MODULE_AUTHOR("Marcell GAL");
 782 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 783 MODULE_LICENSE("GPL");