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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/ip.h>
  20 #include <linux/uaccess.h>
  21 #include <net/arp.h>
  22 #include <linux/atm.h>
  23 #include <linux/atmdev.h>
  24 #include <linux/capability.h>
  25 #include <linux/seq_file.h>
  26
  27 #include <linux/atmbr2684.h>
  28
  29 #include "common.h"
  30
  31 static void skb_debug(const struct sk_buff *skb)
  32 {
  33 #ifdef SKB_DEBUG
  34 #define NUM2PRINT 50
  35         print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
  36                        16, 1, skb->data, min(NUM2PRINT, skb->len), true);
  37 #endif
  38 }
  39
  40 #define BR2684_ETHERTYPE_LEN    2
  41 #define BR2684_PAD_LEN          2
  42
  43 #define LLC             0xaa, 0xaa, 0x03
  44 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
  45 #define SNAP_ROUTED     0x00, 0x00, 0x00
  46 #define PID_ETHERNET    0x00, 0x07
  47 #define ETHERTYPE_IPV4  0x08, 0x00
  48 #define ETHERTYPE_IPV6  0x86, 0xdd
  49 #define PAD_BRIDGED     0x00, 0x00
  50
  51 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
  52 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
  53 static const unsigned char llc_oui_pid_pad[] =
  54                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
  55 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
  56 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
  57
  58 enum br2684_encaps {
  59         e_vc = BR2684_ENCAPS_VC,
  60         e_llc = BR2684_ENCAPS_LLC,
  61 };
  62
  63 struct br2684_vcc {
  64         struct atm_vcc *atmvcc;
  65         struct net_device *device;
  66         /* keep old push, pop functions for chaining */
  67         void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
  68         void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
  69         enum br2684_encaps encaps;
  70         struct list_head brvccs;
  71 #ifdef CONFIG_ATM_BR2684_IPFILTER
  72         struct br2684_filter filter;
  73 #endif /* CONFIG_ATM_BR2684_IPFILTER */
  74         unsigned copies_needed, copies_failed;
  75 };
  76
  77 struct br2684_dev {
  78         struct net_device *net_dev;
  79         struct list_head br2684_devs;
  80         int number;
  81         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
  82         int mac_was_set;
  83         enum br2684_payload payload;
  84 };
  85
  86 /*
  87  * This lock should be held for writing any time the list of devices or
  88  * their attached vcc's could be altered.  It should be held for reading
  89  * any time these are being queried.  Note that we sometimes need to
  90  * do read-locking under interrupt context, so write locking must block
  91  * the current CPU's interrupts
  92  */
  93 static DEFINE_RWLOCK(devs_lock);
  94
  95 static LIST_HEAD(br2684_devs);
  96
  97 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
  98 {
  99         return (struct br2684_dev *)netdev_priv(net_dev);
 100 }
 101
 102 static inline struct net_device *list_entry_brdev(const struct list_head *le)
 103 {
 104         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
 105 }
 106
 107 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
 108 {
 109         return (struct br2684_vcc *)(atmvcc->user_back);
 110 }
 111
 112 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
 113 {
 114         return list_entry(le, struct br2684_vcc, brvccs);
 115 }
 116
 117 /* Caller should hold read_lock(&devs_lock) */
 118 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
 119 {
 120         struct list_head *lh;
 121         struct net_device *net_dev;
 122         switch (s->method) {
 123         case BR2684_FIND_BYNUM:
 124                 list_for_each(lh, &br2684_devs) {
 125                         net_dev = list_entry_brdev(lh);
 126                         if (BRPRIV(net_dev)->number == s->spec.devnum)
 127                                 return net_dev;
 128                 }
 129                 break;
 130         case BR2684_FIND_BYIFNAME:
 131                 list_for_each(lh, &br2684_devs) {
 132                         net_dev = list_entry_brdev(lh);
 133                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
 134                                 return net_dev;
 135                 }
 136                 break;
 137         }
 138         return NULL;
 139 }
 140
 141 /* chained vcc->pop function.  Check if we should wake the netif_queue */
 142 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 143 {
 144         struct br2684_vcc *brvcc = BR2684_VCC(vcc);
 145         struct net_device *net_dev = skb->dev;
 146
 147         pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev);
 148         brvcc->old_pop(vcc, skb);
 149
 150         if (!net_dev)
 151                 return;
 152
 153         if (atm_may_send(vcc, 0))
 154                 netif_wake_queue(net_dev);
 155
 156 }
 157 /*
 158  * Send a packet out a particular vcc.  Not to useful right now, but paves
 159  * the way for multiple vcc's per itf.  Returns true if we can send,
 160  * otherwise false
 161  */
 162 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
 163                            struct br2684_vcc *brvcc)
 164 {
 165         struct br2684_dev *brdev = BRPRIV(dev);
 166         struct atm_vcc *atmvcc;
 167         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
 168
 169         if (skb_headroom(skb) < minheadroom) {
 170                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
 171                 brvcc->copies_needed++;
 172                 dev_kfree_skb(skb);
 173                 if (skb2 == NULL) {
 174                         brvcc->copies_failed++;
 175                         return 0;
 176                 }
 177                 skb = skb2;
 178         }
 179
 180         if (brvcc->encaps == e_llc) {
 181                 if (brdev->payload == p_bridged) {
 182                         skb_push(skb, sizeof(llc_oui_pid_pad));
 183                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
 184                                                 sizeof(llc_oui_pid_pad));
 185                 } else if (brdev->payload == p_routed) {
 186                         unsigned short prot = ntohs(skb->protocol);
 187
 188                         skb_push(skb, sizeof(llc_oui_ipv4));
 189                         switch (prot) {
 190                         case ETH_P_IP:
 191                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
 192                                                         sizeof(llc_oui_ipv4));
 193                                 break;
 194                         case ETH_P_IPV6:
 195                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
 196                                                         sizeof(llc_oui_ipv6));
 197                                 break;
 198                         default:
 199                                 dev_kfree_skb(skb);
 200                                 return 0;
 201                         }
 202                 }
 203         } else { /* e_vc */
 204                 if (brdev->payload == p_bridged) {
 205                         skb_push(skb, 2);
 206                         memset(skb->data, 0, 2);
 207                 } else { /* p_routed */
 208                         skb_pull(skb, ETH_HLEN);
 209                 }
 210         }
 211         skb_debug(skb);
 212
 213         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 214         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 215         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 216         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 217         dev->stats.tx_packets++;
 218         dev->stats.tx_bytes += skb->len;
 219         atmvcc->send(atmvcc, skb);
 220
 221         if (!atm_may_send(atmvcc, 0)) {
 222                 netif_stop_queue(brvcc->device);
 223                 /*check for race with br2684_pop*/
 224                 if (atm_may_send(atmvcc, 0))
 225                         netif_start_queue(brvcc->device);
 226         }
 227
 228         return 1;
 229 }
 230
 231 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
 232                                                    const struct br2684_dev *brdev)
 233 {
 234         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
 235 }
 236
 237 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
 238                                      struct net_device *dev)
 239 {
 240         struct br2684_dev *brdev = BRPRIV(dev);
 241         struct br2684_vcc *brvcc;
 242
 243         pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
 244         read_lock(&devs_lock);
 245         brvcc = pick_outgoing_vcc(skb, brdev);
 246         if (brvcc == NULL) {
 247                 pr_debug("no vcc attached to dev %s\n", dev->name);
 248                 dev->stats.tx_errors++;
 249                 dev->stats.tx_carrier_errors++;
 250                 /* netif_stop_queue(dev); */
 251                 dev_kfree_skb(skb);
 252                 read_unlock(&devs_lock);
 253                 return NETDEV_TX_OK;
 254         }
 255         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
 256                 /*
 257                  * We should probably use netif_*_queue() here, but that
 258                  * involves added complication.  We need to walk before
 259                  * we can run.
 260                  *
 261                  * Don't free here! this pointer might be no longer valid!
 262                  */
 263                 dev->stats.tx_errors++;
 264                 dev->stats.tx_fifo_errors++;
 265         }
 266         read_unlock(&devs_lock);
 267         return NETDEV_TX_OK;
 268 }
 269
 270 /*
 271  * We remember when the MAC gets set, so we don't override it later with
 272  * the ESI of the ATM card of the first VC
 273  */
 274 static int br2684_mac_addr(struct net_device *dev, void *p)
 275 {
 276         int err = eth_mac_addr(dev, p);
 277         if (!err)
 278                 BRPRIV(dev)->mac_was_set = 1;
 279         return err;
 280 }
 281
 282 #ifdef CONFIG_ATM_BR2684_IPFILTER
 283 /* this IOCTL is experimental. */
 284 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
 285 {
 286         struct br2684_vcc *brvcc;
 287         struct br2684_filter_set fs;
 288
 289         if (copy_from_user(&fs, arg, sizeof fs))
 290                 return -EFAULT;
 291         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 292                 /*
 293                  * This is really a per-vcc thing, but we can also search
 294                  * by device.
 295                  */
 296                 struct br2684_dev *brdev;
 297                 read_lock(&devs_lock);
 298                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 299                 if (brdev == NULL || list_empty(&brdev->brvccs) ||
 300                     brdev->brvccs.next != brdev->brvccs.prev)   /* >1 VCC */
 301                         brvcc = NULL;
 302                 else
 303                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 304                 read_unlock(&devs_lock);
 305                 if (brvcc == NULL)
 306                         return -ESRCH;
 307         } else
 308                 brvcc = BR2684_VCC(atmvcc);
 309         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 310         return 0;
 311 }
 312
 313 /* Returns 1 if packet should be dropped */
 314 static inline int
 315 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 316 {
 317         if (brvcc->filter.netmask == 0)
 318                 return 0;       /* no filter in place */
 319         if (type == htons(ETH_P_IP) &&
 320             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
 321              netmask) == brvcc->filter.prefix)
 322                 return 0;
 323         if (type == htons(ETH_P_ARP))
 324                 return 0;
 325         /*
 326          * TODO: we should probably filter ARPs too.. don't want to have
 327          * them returning values that don't make sense, or is that ok?
 328          */
 329         return 1;               /* drop */
 330 }
 331 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 332
 333 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 334 {
 335         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 336         write_lock_irq(&devs_lock);
 337         list_del(&brvcc->brvccs);
 338         write_unlock_irq(&devs_lock);
 339         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 340         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 341         kfree(brvcc);
 342         module_put(THIS_MODULE);
 343 }
 344
 345 /* when AAL5 PDU comes in: */
 346 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 347 {
 348         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 349         struct net_device *net_dev = brvcc->device;
 350         struct br2684_dev *brdev = BRPRIV(net_dev);
 351
 352         pr_debug("\n");
 353
 354         if (unlikely(skb == NULL)) {
 355                 /* skb==NULL means VCC is being destroyed */
 356                 br2684_close_vcc(brvcc);
 357                 if (list_empty(&brdev->brvccs)) {
 358                         write_lock_irq(&devs_lock);
 359                         list_del(&brdev->br2684_devs);
 360                         write_unlock_irq(&devs_lock);
 361                         unregister_netdev(net_dev);
 362                         free_netdev(net_dev);
 363                 }
 364                 return;
 365         }
 366
 367         skb_debug(skb);
 368         atm_return(atmvcc, skb->truesize);
 369         pr_debug("skb from brdev %p\n", brdev);
 370         if (brvcc->encaps == e_llc) {
 371
 372                 if (skb->len > 7 && skb->data[7] == 0x01)
 373                         __skb_trim(skb, skb->len - 4);
 374
 375                 /* accept packets that have "ipv[46]" in the snap header */
 376                 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
 377                     (memcmp(skb->data, llc_oui_ipv4,
 378                             sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
 379                         if (memcmp(skb->data + 6, ethertype_ipv6,
 380                                    sizeof(ethertype_ipv6)) == 0)
 381                                 skb->protocol = htons(ETH_P_IPV6);
 382                         else if (memcmp(skb->data + 6, ethertype_ipv4,
 383                                         sizeof(ethertype_ipv4)) == 0)
 384                                 skb->protocol = htons(ETH_P_IP);
 385                         else
 386                                 goto error;
 387                         skb_pull(skb, sizeof(llc_oui_ipv4));
 388                         skb_reset_network_header(skb);
 389                         skb->pkt_type = PACKET_HOST;
 390                 /*
 391                  * Let us waste some time for checking the encapsulation.
 392                  * Note, that only 7 char is checked so frames with a valid FCS
 393                  * are also accepted (but FCS is not checked of course).
 394                  */
 395                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
 396                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
 397                         skb_pull(skb, sizeof(llc_oui_pid_pad));
 398                         skb->protocol = eth_type_trans(skb, net_dev);
 399                 } else
 400                         goto error;
 401
 402         } else { /* e_vc */
 403                 if (brdev->payload == p_routed) {
 404                         struct iphdr *iph;
 405
 406                         skb_reset_network_header(skb);
 407                         iph = ip_hdr(skb);
 408                         if (iph->version == 4)
 409                                 skb->protocol = htons(ETH_P_IP);
 410                         else if (iph->version == 6)
 411                                 skb->protocol = htons(ETH_P_IPV6);
 412                         else
 413                                 goto error;
 414                         skb->pkt_type = PACKET_HOST;
 415                 } else { /* p_bridged */
 416                         /* first 2 chars should be 0 */
 417                         if (*((u16 *) (skb->data)) != 0)
 418                                 goto error;
 419                         skb_pull(skb, BR2684_PAD_LEN);
 420                         skb->protocol = eth_type_trans(skb, net_dev);
 421                 }
 422         }
 423
 424 #ifdef CONFIG_ATM_BR2684_IPFILTER
 425         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
 426                 goto dropped;
 427 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 428         skb->dev = net_dev;
 429         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 430         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
 431         skb_debug(skb);
 432         /* sigh, interface is down? */
 433         if (unlikely(!(net_dev->flags & IFF_UP)))
 434                 goto dropped;
 435         net_dev->stats.rx_packets++;
 436         net_dev->stats.rx_bytes += skb->len;
 437         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 438         netif_rx(skb);
 439         return;
 440
 441 dropped:
 442         net_dev->stats.rx_dropped++;
 443         goto free_skb;
 444 error:
 445         net_dev->stats.rx_errors++;
 446 free_skb:
 447         dev_kfree_skb(skb);
 448         return;
 449 }
 450
 451 /*
 452  * Assign a vcc to a dev
 453  * Note: we do not have explicit unassign, but look at _push()
 454  */
 455 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
 456 {
 457         struct sk_buff_head queue;
 458         int err;
 459         struct br2684_vcc *brvcc;
 460         struct sk_buff *skb, *tmp;
 461         struct sk_buff_head *rq;
 462         struct br2684_dev *brdev;
 463         struct net_device *net_dev;
 464         struct atm_backend_br2684 be;
 465         unsigned long flags;
 466
 467         if (copy_from_user(&be, arg, sizeof be))
 468                 return -EFAULT;
 469         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 470         if (!brvcc)
 471                 return -ENOMEM;
 472         write_lock_irq(&devs_lock);
 473         net_dev = br2684_find_dev(&be.ifspec);
 474         if (net_dev == NULL) {
 475                 pr_err("tried to attach to non-existant device\n");
 476                 err = -ENXIO;
 477                 goto error;
 478         }
 479         brdev = BRPRIV(net_dev);
 480         if (atmvcc->push == NULL) {
 481                 err = -EBADFD;
 482                 goto error;
 483         }
 484         if (!list_empty(&brdev->brvccs)) {
 485                 /* Only 1 VCC/dev right now */
 486                 err = -EEXIST;
 487                 goto error;
 488         }
 489         if (be.fcs_in != BR2684_FCSIN_NO ||
 490             be.fcs_out != BR2684_FCSOUT_NO ||
 491             be.fcs_auto || be.has_vpiid || be.send_padding ||
 492             (be.encaps != BR2684_ENCAPS_VC &&
 493              be.encaps != BR2684_ENCAPS_LLC) ||
 494             be.min_size != 0) {
 495                 err = -EINVAL;
 496                 goto error;
 497         }
 498         pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
 499         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 500                 unsigned char *esi = atmvcc->dev->esi;
 501                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 502                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 503                 else
 504                         net_dev->dev_addr[2] = 1;
 505         }
 506         list_add(&brvcc->brvccs, &brdev->brvccs);
 507         write_unlock_irq(&devs_lock);
 508         brvcc->device = net_dev;
 509         brvcc->atmvcc = atmvcc;
 510         atmvcc->user_back = brvcc;
 511         brvcc->encaps = (enum br2684_encaps)be.encaps;
 512         brvcc->old_push = atmvcc->push;
 513         brvcc->old_pop = atmvcc->pop;
 514         barrier();
 515         atmvcc->push = br2684_push;
 516         atmvcc->pop = br2684_pop;
 517
 518         __skb_queue_head_init(&queue);
 519         rq = &sk_atm(atmvcc)->sk_receive_queue;
 520
 521         spin_lock_irqsave(&rq->lock, flags);
 522         skb_queue_splice_init(rq, &queue);
 523         spin_unlock_irqrestore(&rq->lock, flags);
 524
 525         skb_queue_walk_safe(&queue, skb, tmp) {
 526                 struct net_device *dev = skb->dev;
 527
 528                 dev->stats.rx_bytes -= skb->len;
 529                 dev->stats.rx_packets--;
 530
 531                 br2684_push(atmvcc, skb);
 532         }
 533         __module_get(THIS_MODULE);
 534         return 0;
 535
 536 error:
 537         write_unlock_irq(&devs_lock);
 538         kfree(brvcc);
 539         return err;
 540 }
 541
 542 static const struct net_device_ops br2684_netdev_ops = {
 543         .ndo_start_xmit         = br2684_start_xmit,
 544         .ndo_set_mac_address    = br2684_mac_addr,
 545         .ndo_change_mtu         = eth_change_mtu,
 546         .ndo_validate_addr      = eth_validate_addr,
 547 };
 548
 549 static const struct net_device_ops br2684_netdev_ops_routed = {
 550         .ndo_start_xmit         = br2684_start_xmit,
 551         .ndo_set_mac_address    = br2684_mac_addr,
 552         .ndo_change_mtu         = eth_change_mtu
 553 };
 554
 555 static void br2684_setup(struct net_device *netdev)
 556 {
 557         struct br2684_dev *brdev = BRPRIV(netdev);
 558
 559         ether_setup(netdev);
 560         brdev->net_dev = netdev;
 561
 562         netdev->netdev_ops = &br2684_netdev_ops;
 563
 564         INIT_LIST_HEAD(&brdev->brvccs);
 565 }
 566
 567 static void br2684_setup_routed(struct net_device *netdev)
 568 {
 569         struct br2684_dev *brdev = BRPRIV(netdev);
 570
 571         brdev->net_dev = netdev;
 572         netdev->hard_header_len = 0;
 573         netdev->netdev_ops = &br2684_netdev_ops_routed;
 574         netdev->addr_len = 0;
 575         netdev->mtu = 1500;
 576         netdev->type = ARPHRD_PPP;
 577         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 578         netdev->tx_queue_len = 100;
 579         INIT_LIST_HEAD(&brdev->brvccs);
 580 }
 581
 582 static int br2684_create(void __user *arg)
 583 {
 584         int err;
 585         struct net_device *netdev;
 586         struct br2684_dev *brdev;
 587         struct atm_newif_br2684 ni;
 588         enum br2684_payload payload;
 589
 590         pr_debug("\n");
 591
 592         if (copy_from_user(&ni, arg, sizeof ni))
 593                 return -EFAULT;
 594
 595         if (ni.media & BR2684_FLAG_ROUTED)
 596                 payload = p_routed;
 597         else
 598                 payload = p_bridged;
 599         ni.media &= 0xffff;     /* strip flags */
 600
 601         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
 602                 return -EINVAL;
 603
 604         netdev = alloc_netdev(sizeof(struct br2684_dev),
 605                               ni.ifname[0] ? ni.ifname : "nas%d",
 606                               (payload == p_routed) ?
 607                               br2684_setup_routed : br2684_setup);
 608         if (!netdev)
 609                 return -ENOMEM;
 610
 611         brdev = BRPRIV(netdev);
 612
 613         pr_debug("registered netdev %s\n", netdev->name);
 614         /* open, stop, do_ioctl ? */
 615         err = register_netdev(netdev);
 616         if (err < 0) {
 617                 pr_err("register_netdev failed\n");
 618                 free_netdev(netdev);
 619                 return err;
 620         }
 621
 622         write_lock_irq(&devs_lock);
 623         brdev->payload = payload;
 624         brdev->number = list_empty(&br2684_devs) ? 1 :
 625             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 626         list_add_tail(&brdev->br2684_devs, &br2684_devs);
 627         write_unlock_irq(&devs_lock);
 628         return 0;
 629 }
 630
 631 /*
 632  * This handles ioctls actually performed on our vcc - we must return
 633  * -ENOIOCTLCMD for any unrecognized ioctl
 634  */
 635 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
 636                         unsigned long arg)
 637 {
 638         struct atm_vcc *atmvcc = ATM_SD(sock);
 639         void __user *argp = (void __user *)arg;
 640         atm_backend_t b;
 641
 642         int err;
 643         switch (cmd) {
 644         case ATM_SETBACKEND:
 645         case ATM_NEWBACKENDIF:
 646                 err = get_user(b, (atm_backend_t __user *) argp);
 647                 if (err)
 648                         return -EFAULT;
 649                 if (b != ATM_BACKEND_BR2684)
 650                         return -ENOIOCTLCMD;
 651                 if (!capable(CAP_NET_ADMIN))
 652                         return -EPERM;
 653                 if (cmd == ATM_SETBACKEND)
 654                         return br2684_regvcc(atmvcc, argp);
 655                 else
 656                         return br2684_create(argp);
 657 #ifdef CONFIG_ATM_BR2684_IPFILTER
 658         case BR2684_SETFILT:
 659                 if (atmvcc->push != br2684_push)
 660                         return -ENOIOCTLCMD;
 661                 if (!capable(CAP_NET_ADMIN))
 662                         return -EPERM;
 663                 err = br2684_setfilt(atmvcc, argp);
 664
 665                 return err;
 666 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 667         }
 668         return -ENOIOCTLCMD;
 669 }
 670
 671 static struct atm_ioctl br2684_ioctl_ops = {
 672         .owner = THIS_MODULE,
 673         .ioctl = br2684_ioctl,
 674 };
 675
 676 #ifdef CONFIG_PROC_FS
 677 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
 678         __acquires(devs_lock)
 679 {
 680         read_lock(&devs_lock);
 681         return seq_list_start(&br2684_devs, *pos);
 682 }
 683
 684 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
 685 {
 686         return seq_list_next(v, &br2684_devs, pos);
 687 }
 688
 689 static void br2684_seq_stop(struct seq_file *seq, void *v)
 690         __releases(devs_lock)
 691 {
 692         read_unlock(&devs_lock);
 693 }
 694
 695 static int br2684_seq_show(struct seq_file *seq, void *v)
 696 {
 697         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
 698                                                     br2684_devs);
 699         const struct net_device *net_dev = brdev->net_dev;
 700         const struct br2684_vcc *brvcc;
 701
 702         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
 703                    net_dev->name,
 704                    brdev->number,
 705                    net_dev->dev_addr,
 706                    brdev->mac_was_set ? "set" : "auto");
 707
 708         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 709                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
 710                            ", failed copies %u/%u"
 711                            "\n", brvcc->atmvcc->dev->number,
 712                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 713                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
 714                            (brdev->payload == p_bridged) ? "bridged" : "routed",
 715                            brvcc->copies_failed, brvcc->copies_needed);
 716 #ifdef CONFIG_ATM_BR2684_IPFILTER
 717 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 718 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 719                 if (brvcc->filter.netmask != 0)
 720                         seq_printf(seq, "    filter=%d.%d.%d.%d/"
 721                                    "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
 722 #undef bs
 723 #undef b1
 724 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 725         }
 726         return 0;
 727 }
 728
 729 static const struct seq_operations br2684_seq_ops = {
 730         .start = br2684_seq_start,
 731         .next = br2684_seq_next,
 732         .stop = br2684_seq_stop,
 733         .show = br2684_seq_show,
 734 };
 735
 736 static int br2684_proc_open(struct inode *inode, struct file *file)
 737 {
 738         return seq_open(file, &br2684_seq_ops);
 739 }
 740
 741 static const struct file_operations br2684_proc_ops = {
 742         .owner = THIS_MODULE,
 743         .open = br2684_proc_open,
 744         .read = seq_read,
 745         .llseek = seq_lseek,
 746         .release = seq_release,
 747 };
 748
 749 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 750 #endif /* CONFIG_PROC_FS */
 751
 752 static int __init br2684_init(void)
 753 {
 754 #ifdef CONFIG_PROC_FS
 755         struct proc_dir_entry *p;
 756         p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
 757         if (p == NULL)
 758                 return -ENOMEM;
 759 #endif
 760         register_atm_ioctl(&br2684_ioctl_ops);
 761         return 0;
 762 }
 763
 764 static void __exit br2684_exit(void)
 765 {
 766         struct net_device *net_dev;
 767         struct br2684_dev *brdev;
 768         struct br2684_vcc *brvcc;
 769         deregister_atm_ioctl(&br2684_ioctl_ops);
 770
 771 #ifdef CONFIG_PROC_FS
 772         remove_proc_entry("br2684", atm_proc_root);
 773 #endif
 774
 775         while (!list_empty(&br2684_devs)) {
 776                 net_dev = list_entry_brdev(br2684_devs.next);
 777                 brdev = BRPRIV(net_dev);
 778                 while (!list_empty(&brdev->brvccs)) {
 779                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 780                         br2684_close_vcc(brvcc);
 781                 }
 782
 783                 list_del(&brdev->br2684_devs);
 784                 unregister_netdev(net_dev);
 785                 free_netdev(net_dev);
 786         }
 787 }
 788
 789 module_init(br2684_init);
 790 module_exit(br2684_exit);
 791
 792 MODULE_AUTHOR("Marcell GAL");
 793 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 794 MODULE_LICENSE("GPL");