net/atm/br2684.c

   1 /*
   2 Experimental ethernet netdevice using ATM AAL5 as underlying carrier
   3 (RFC1483 obsoleted by RFC2684) for Linux 2.4
   4 Author: Marcell GAL, 2000, XDSL Ltd, Hungary
   5 */
   6
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/list.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/ip.h>
  16 #include <asm/uaccess.h>
  17 #include <net/arp.h>
  18 #include <linux/atm.h>
  19 #include <linux/atmdev.h>
  20 #include <linux/capability.h>
  21 #include <linux/seq_file.h>
  22
  23 #include <linux/atmbr2684.h>
  24
  25 #include "common.h"
  26
  27 /*
  28  * Define this to use a version of the code which interacts with the higher
  29  * layers in a more intellegent way, by always reserving enough space for
  30  * our header at the begining of the packet.  However, there may still be
  31  * some problems with programs like tcpdump.  In 2.5 we'll sort out what
  32  * we need to do to get this perfect.  For now we just will copy the packet
  33  * if we need space for the header
  34  */
  35 /* #define FASTER_VERSION */
  36
  37 #ifdef DEBUG
  38 #define DPRINTK(format, args...) printk(KERN_DEBUG "br2684: " format, ##args)
  39 #else
  40 #define DPRINTK(format, args...)
  41 #endif
  42
  43 #ifdef SKB_DEBUG
  44 static void skb_debug(const struct sk_buff *skb)
  45 {
  46 #define NUM2PRINT 50
  47         char buf[NUM2PRINT * 3 + 1];    /* 3 chars per byte */
  48         int i = 0;
  49         for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
  50                 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
  51         }
  52         printk(KERN_DEBUG "br2684: skb: %s\n", buf);
  53 }
  54 #else
  55 #define skb_debug(skb)  do {} while (0)
  56 #endif
  57
  58 static unsigned char llc_oui_pid_pad[] =
  59     { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
  60 #define PADLEN  (2)
  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 #ifndef FASTER_VERSION
  79         unsigned copies_needed, copies_failed;
  80 #endif /* FASTER_VERSION */
  81 };
  82
  83 struct br2684_dev {
  84         struct net_device *net_dev;
  85         struct list_head br2684_devs;
  86         int number;
  87         struct list_head brvccs; /* one device <=> one vcc (before xmas) */
  88         struct net_device_stats stats;
  89         int mac_was_set;
  90 };
  91
  92 /*
  93  * This lock should be held for writing any time the list of devices or
  94  * their attached vcc's could be altered.  It should be held for reading
  95  * any time these are being queried.  Note that we sometimes need to
  96  * do read-locking under interrupt context, so write locking must block
  97  * the current CPU's interrupts
  98  */
  99 static DEFINE_RWLOCK(devs_lock);
 100
 101 static LIST_HEAD(br2684_devs);
 102
 103 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
 104 {
 105         return (struct br2684_dev *) net_dev->priv;
 106 }
 107
 108 static inline struct net_device *list_entry_brdev(const struct list_head *le)
 109 {
 110         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
 111 }
 112
 113 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
 114 {
 115         return (struct br2684_vcc *) (atmvcc->user_back);
 116 }
 117
 118 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
 119 {
 120         return list_entry(le, struct br2684_vcc, brvccs);
 121 }
 122
 123 /* Caller should hold read_lock(&devs_lock) */
 124 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
 125 {
 126         struct list_head *lh;
 127         struct net_device *net_dev;
 128         switch (s->method) {
 129         case BR2684_FIND_BYNUM:
 130                 list_for_each(lh, &br2684_devs) {
 131                         net_dev = list_entry_brdev(lh);
 132                         if (BRPRIV(net_dev)->number == s->spec.devnum)
 133                                 return net_dev;
 134                 }
 135                 break;
 136         case BR2684_FIND_BYIFNAME:
 137                 list_for_each(lh, &br2684_devs) {
 138                         net_dev = list_entry_brdev(lh);
 139                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
 140                                 return net_dev;
 141                 }
 142                 break;
 143         }
 144         return NULL;
 145 }
 146
 147 /*
 148  * Send a packet out a particular vcc.  Not to useful right now, but paves
 149  * the way for multiple vcc's per itf.  Returns true if we can send,
 150  * otherwise false
 151  */
 152 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
 153         struct br2684_vcc *brvcc)
 154 {
 155         struct atm_vcc *atmvcc;
 156 #ifdef FASTER_VERSION
 157         if (brvcc->encaps == e_llc)
 158                 memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8);
 159         /* last 2 bytes of llc_oui_pid_pad are managed by header routines;
 160            yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad)
 161          */
 162 #else
 163         int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
 164         if (skb_headroom(skb) < minheadroom) {
 165                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
 166                 brvcc->copies_needed++;
 167                 dev_kfree_skb(skb);
 168                 if (skb2 == NULL) {
 169                         brvcc->copies_failed++;
 170                         return 0;
 171                 }
 172                 skb = skb2;
 173         }
 174         skb_push(skb, minheadroom);
 175         if (brvcc->encaps == e_llc)
 176                 memcpy(skb->data, llc_oui_pid_pad, 10);
 177         else
 178                 memset(skb->data, 0, 2);
 179 #endif /* FASTER_VERSION */
 180         skb_debug(skb);
 181
 182         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
 183         DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 184         if (!atm_may_send(atmvcc, skb->truesize)) {
 185                 /* we free this here for now, because we cannot know in a higher
 186                         layer whether the skb point it supplied wasn't freed yet.
 187                         now, it always is.
 188                 */
 189                 dev_kfree_skb(skb);
 190                 return 0;
 191                 }
 192         atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 193         ATM_SKB(skb)->atm_options = atmvcc->atm_options;
 194         brdev->stats.tx_packets++;
 195         brdev->stats.tx_bytes += skb->len;
 196         atmvcc->send(atmvcc, skb);
 197         return 1;
 198 }
 199
 200 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
 201         struct br2684_dev *brdev)
 202 {
 203         return list_empty(&brdev->brvccs) ? NULL :
 204             list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
 205 }
 206
 207 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
 208 {
 209         struct br2684_dev *brdev = BRPRIV(dev);
 210         struct br2684_vcc *brvcc;
 211
 212         DPRINTK("br2684_start_xmit, skb->dst=%p\n", skb->dst);
 213         read_lock(&devs_lock);
 214         brvcc = pick_outgoing_vcc(skb, brdev);
 215         if (brvcc == NULL) {
 216                 DPRINTK("no vcc attached to dev %s\n", dev->name);
 217                 brdev->stats.tx_errors++;
 218                 brdev->stats.tx_carrier_errors++;
 219                 /* netif_stop_queue(dev); */
 220                 dev_kfree_skb(skb);
 221                 read_unlock(&devs_lock);
 222                 return 0;
 223         }
 224         if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
 225                 /*
 226                  * We should probably use netif_*_queue() here, but that
 227                  * involves added complication.  We need to walk before
 228                  * we can run
 229                  */
 230                 /* don't free here! this pointer might be no longer valid!
 231                 dev_kfree_skb(skb);
 232                 */
 233                 brdev->stats.tx_errors++;
 234                 brdev->stats.tx_fifo_errors++;
 235         }
 236         read_unlock(&devs_lock);
 237         return 0;
 238 }
 239
 240 static struct net_device_stats *br2684_get_stats(struct net_device *dev)
 241 {
 242         DPRINTK("br2684_get_stats\n");
 243         return &BRPRIV(dev)->stats;
 244 }
 245
 246 #ifdef FASTER_VERSION
 247 /*
 248  * These mirror eth_header and eth_header_cache.  They are not usually
 249  * exported for use in modules, so we grab them from net_device
 250  * after ether_setup() is done with it.  Bit of a hack.
 251  */
 252 static int (*my_eth_header)(struct sk_buff *, struct net_device *,
 253         unsigned short, void *, void *, unsigned);
 254 static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *);
 255
 256 static int
 257 br2684_header(struct sk_buff *skb, struct net_device *dev,
 258               unsigned short type, void *daddr, void *saddr, unsigned len)
 259 {
 260         u16 *pad_before_eth;
 261         int t = my_eth_header(skb, dev, type, daddr, saddr, len);
 262         if (t > 0) {
 263                 pad_before_eth = (u16 *) skb_push(skb, 2);
 264                 *pad_before_eth = 0;
 265                 return dev->hard_header_len;    /* or return 16; ? */
 266         } else
 267                 return t;
 268 }
 269
 270 static int
 271 br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 272 {
 273 /* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so
 274 xmit will add the additional header part in that case */
 275         u16 *pad_before_eth = (u16 *)(hh->hh_data);
 276         int t = my_eth_header_cache(neigh, hh);
 277         DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh);
 278         if (t < 0)
 279                 return t;
 280         else {
 281                 *pad_before_eth = 0;
 282                 hh->hh_len = PADLEN + ETH_HLEN;
 283         }
 284         return 0;
 285 }
 286
 287 /*
 288  * This is similar to eth_type_trans, which cannot be used because of
 289  * our dev->hard_header_len
 290  */
 291 static inline __be16 br_type_trans(struct sk_buff *skb, struct net_device *dev)
 292 {
 293         struct ethhdr *eth;
 294         unsigned char *rawp;
 295         eth = eth_hdr(skb);
 296
 297         if (is_multicast_ether_addr(eth->h_dest)) {
 298                 if (!compare_ether_addr(eth->h_dest, dev->broadcast))
 299                         skb->pkt_type = PACKET_BROADCAST;
 300                 else
 301                         skb->pkt_type = PACKET_MULTICAST;
 302         }
 303
 304         else if (compare_ether_addr(eth->h_dest, dev->dev_addr))
 305                 skb->pkt_type = PACKET_OTHERHOST;
 306
 307         if (ntohs(eth->h_proto) >= 1536)
 308                 return eth->h_proto;
 309
 310         rawp = skb->data;
 311
 312         /*
 313          * This is a magic hack to spot IPX packets. Older Novell breaks
 314          * the protocol design and runs IPX over 802.3 without an 802.2 LLC
 315          * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 316          * won't work for fault tolerant netware but does for the rest.
 317          */
 318         if (*(unsigned short *) rawp == 0xFFFF)
 319                 return htons(ETH_P_802_3);
 320
 321         /*
 322          * Real 802.2 LLC
 323          */
 324         return htons(ETH_P_802_2);
 325 }
 326 #endif /* FASTER_VERSION */
 327
 328 /*
 329  * We remember when the MAC gets set, so we don't override it later with
 330  * the ESI of the ATM card of the first VC
 331  */
 332 static int (*my_eth_mac_addr)(struct net_device *, void *);
 333 static int br2684_mac_addr(struct net_device *dev, void *p)
 334 {
 335         int err = my_eth_mac_addr(dev, p);
 336         if (!err)
 337                 BRPRIV(dev)->mac_was_set = 1;
 338         return err;
 339 }
 340
 341 #ifdef CONFIG_ATM_BR2684_IPFILTER
 342 /* this IOCTL is experimental. */
 343 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg)
 344 {
 345         struct br2684_vcc *brvcc;
 346         struct br2684_filter_set fs;
 347
 348         if (copy_from_user(&fs, arg, sizeof fs))
 349                 return -EFAULT;
 350         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
 351                 /*
 352                  * This is really a per-vcc thing, but we can also search
 353                  * by device
 354                  */
 355                 struct br2684_dev *brdev;
 356                 read_lock(&devs_lock);
 357                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
 358                 if (brdev == NULL || list_empty(&brdev->brvccs) ||
 359                     brdev->brvccs.next != brdev->brvccs.prev)  /* >1 VCC */
 360                         brvcc = NULL;
 361                 else
 362                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 363                 read_unlock(&devs_lock);
 364                 if (brvcc == NULL)
 365                         return -ESRCH;
 366         } else
 367                 brvcc = BR2684_VCC(atmvcc);
 368         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
 369         return 0;
 370 }
 371
 372 /* Returns 1 if packet should be dropped */
 373 static inline int
 374 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
 375 {
 376         if (brvcc->filter.netmask == 0)
 377                 return 0;                       /* no filter in place */
 378         if (type == __constant_htons(ETH_P_IP) &&
 379             (((struct iphdr *) (skb->data))->daddr & brvcc->filter.
 380              netmask) == brvcc->filter.prefix)
 381                 return 0;
 382         if (type == __constant_htons(ETH_P_ARP))
 383                 return 0;
 384         /* TODO: we should probably filter ARPs too.. don't want to have
 385          *   them returning values that don't make sense, or is that ok?
 386          */
 387         return 1;               /* drop */
 388 }
 389 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 390
 391 static void br2684_close_vcc(struct br2684_vcc *brvcc)
 392 {
 393         DPRINTK("removing VCC %p from dev %p\n", brvcc, brvcc->device);
 394         write_lock_irq(&devs_lock);
 395         list_del(&brvcc->brvccs);
 396         write_unlock_irq(&devs_lock);
 397         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
 398         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
 399         kfree(brvcc);
 400         module_put(THIS_MODULE);
 401 }
 402
 403 /* when AAL5 PDU comes in: */
 404 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
 405 {
 406         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
 407         struct net_device *net_dev = brvcc->device;
 408         struct br2684_dev *brdev = BRPRIV(net_dev);
 409         int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN;
 410
 411         DPRINTK("br2684_push\n");
 412
 413         if (unlikely(skb == NULL)) {
 414                 /* skb==NULL means VCC is being destroyed */
 415                 br2684_close_vcc(brvcc);
 416                 if (list_empty(&brdev->brvccs)) {
 417                         read_lock(&devs_lock);
 418                         list_del(&brdev->br2684_devs);
 419                         read_unlock(&devs_lock);
 420                         unregister_netdev(net_dev);
 421                         free_netdev(net_dev);
 422                 }
 423                 return;
 424         }
 425
 426         skb_debug(skb);
 427         atm_return(atmvcc, skb->truesize);
 428         DPRINTK("skb from brdev %p\n", brdev);
 429         if (brvcc->encaps == e_llc) {
 430                 /* let us waste some time for checking the encapsulation.
 431                    Note, that only 7 char is checked so frames with a valid FCS
 432                    are also accepted (but FCS is not checked of course) */
 433                 if (memcmp(skb->data, llc_oui_pid_pad, 7)) {
 434                         brdev->stats.rx_errors++;
 435                         dev_kfree_skb(skb);
 436                         return;
 437                 }
 438
 439                 /* Strip FCS if present */
 440                 if (skb->len > 7 && skb->data[7] == 0x01)
 441                         __skb_trim(skb, skb->len - 4);
 442         } else {
 443                 plen = PADLEN + ETH_HLEN;       /* pad, dstmac,srcmac, ethtype */
 444                 /* first 2 chars should be 0 */
 445                 if (*((u16 *) (skb->data)) != 0) {
 446                         brdev->stats.rx_errors++;
 447                         dev_kfree_skb(skb);
 448                         return;
 449                 }
 450         }
 451         if (skb->len < plen) {
 452                 brdev->stats.rx_errors++;
 453                 dev_kfree_skb(skb);     /* dev_ not needed? */
 454                 return;
 455         }
 456
 457 #ifdef FASTER_VERSION
 458         /* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier,
 459            than should be. What else should I set? */
 460         skb_pull(skb, plen);
 461         skb->mac.raw = ((char *) (skb->data)) - ETH_HLEN;
 462         skb->pkt_type = PACKET_HOST;
 463 #ifdef CONFIG_BR2684_FAST_TRANS
 464         skb->protocol = ((u16 *) skb->data)[-1];
 465 #else                           /* some protocols might require this: */
 466         skb->protocol = br_type_trans(skb, net_dev);
 467 #endif /* CONFIG_BR2684_FAST_TRANS */
 468 #else
 469         skb_pull(skb, plen - ETH_HLEN);
 470         skb->protocol = eth_type_trans(skb, net_dev);
 471 #endif /* FASTER_VERSION */
 472 #ifdef CONFIG_ATM_BR2684_IPFILTER
 473         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
 474                 brdev->stats.rx_dropped++;
 475                 dev_kfree_skb(skb);
 476                 return;
 477         }
 478 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 479         skb->dev = net_dev;
 480         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
 481         DPRINTK("received packet's protocol: %x\n", ntohs(skb->protocol));
 482         skb_debug(skb);
 483         if (unlikely(!(net_dev->flags & IFF_UP))) {
 484                 /* sigh, interface is down */
 485                 brdev->stats.rx_dropped++;
 486                 dev_kfree_skb(skb);
 487                 return;
 488         }
 489         brdev->stats.rx_packets++;
 490         brdev->stats.rx_bytes += skb->len;
 491         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 492         netif_rx(skb);
 493 }
 494
 495 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg)
 496 {
 497 /* assign a vcc to a dev
 498 Note: we do not have explicit unassign, but look at _push()
 499 */
 500         int err;
 501         struct br2684_vcc *brvcc;
 502         struct sk_buff *skb;
 503         struct sk_buff_head *rq;
 504         struct br2684_dev *brdev;
 505         struct net_device *net_dev;
 506         struct atm_backend_br2684 be;
 507         unsigned long flags;
 508
 509         if (copy_from_user(&be, arg, sizeof be))
 510                 return -EFAULT;
 511         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
 512         if (!brvcc)
 513                 return -ENOMEM;
 514         write_lock_irq(&devs_lock);
 515         net_dev = br2684_find_dev(&be.ifspec);
 516         if (net_dev == NULL) {
 517                 printk(KERN_ERR
 518                     "br2684: tried to attach to non-existant device\n");
 519                 err = -ENXIO;
 520                 goto error;
 521         }
 522         brdev = BRPRIV(net_dev);
 523         if (atmvcc->push == NULL) {
 524                 err = -EBADFD;
 525                 goto error;
 526         }
 527         if (!list_empty(&brdev->brvccs)) {
 528                 /* Only 1 VCC/dev right now */
 529                 err = -EEXIST;
 530                 goto error;
 531         }
 532         if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
 533             be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
 534             BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) ||
 535             be.min_size != 0) {
 536                 err = -EINVAL;
 537                 goto error;
 538         }
 539         DPRINTK("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps,
 540                 brvcc);
 541         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
 542                 unsigned char *esi = atmvcc->dev->esi;
 543                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
 544                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
 545                 else
 546                         net_dev->dev_addr[2] = 1;
 547         }
 548         list_add(&brvcc->brvccs, &brdev->brvccs);
 549         write_unlock_irq(&devs_lock);
 550         brvcc->device = net_dev;
 551         brvcc->atmvcc = atmvcc;
 552         atmvcc->user_back = brvcc;
 553         brvcc->encaps = (enum br2684_encaps) be.encaps;
 554         brvcc->old_push = atmvcc->push;
 555         barrier();
 556         atmvcc->push = br2684_push;
 557
 558         rq = &sk_atm(atmvcc)->sk_receive_queue;
 559
 560         spin_lock_irqsave(&rq->lock, flags);
 561         if (skb_queue_empty(rq)) {
 562                 skb = NULL;
 563         } else {
 564                 /* NULL terminate the list.  */
 565                 rq->prev->next = NULL;
 566                 skb = rq->next;
 567         }
 568         rq->prev = rq->next = (struct sk_buff *)rq;
 569         rq->qlen = 0;
 570         spin_unlock_irqrestore(&rq->lock, flags);
 571
 572         while (skb) {
 573                 struct sk_buff *next = skb->next;
 574
 575                 skb->next = skb->prev = NULL;
 576                 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
 577                 BRPRIV(skb->dev)->stats.rx_packets--;
 578                 br2684_push(atmvcc, skb);
 579
 580                 skb = next;
 581         }
 582         __module_get(THIS_MODULE);
 583         return 0;
 584     error:
 585         write_unlock_irq(&devs_lock);
 586         kfree(brvcc);
 587         return err;
 588 }
 589
 590 static void br2684_setup(struct net_device *netdev)
 591 {
 592         struct br2684_dev *brdev = BRPRIV(netdev);
 593
 594         ether_setup(netdev);
 595         brdev->net_dev = netdev;
 596
 597 #ifdef FASTER_VERSION
 598         my_eth_header = netdev->hard_header;
 599         netdev->hard_header = br2684_header;
 600         my_eth_header_cache = netdev->hard_header_cache;
 601         netdev->hard_header_cache = br2684_header_cache;
 602         netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN;   /* 10 + 14 */
 603 #endif
 604         my_eth_mac_addr = netdev->set_mac_address;
 605         netdev->set_mac_address = br2684_mac_addr;
 606         netdev->hard_start_xmit = br2684_start_xmit;
 607         netdev->get_stats = br2684_get_stats;
 608
 609         INIT_LIST_HEAD(&brdev->brvccs);
 610 }
 611
 612 static int br2684_create(void __user *arg)
 613 {
 614         int err;
 615         struct net_device *netdev;
 616         struct br2684_dev *brdev;
 617         struct atm_newif_br2684 ni;
 618
 619         DPRINTK("br2684_create\n");
 620
 621         if (copy_from_user(&ni, arg, sizeof ni)) {
 622                 return -EFAULT;
 623         }
 624         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
 625                 return -EINVAL;
 626         }
 627
 628         netdev = alloc_netdev(sizeof(struct br2684_dev),
 629                               ni.ifname[0] ? ni.ifname : "nas%d",
 630                               br2684_setup);
 631         if (!netdev)
 632                 return -ENOMEM;
 633
 634         brdev = BRPRIV(netdev);
 635
 636         DPRINTK("registered netdev %s\n", netdev->name);
 637         /* open, stop, do_ioctl ? */
 638         err = register_netdev(netdev);
 639         if (err < 0) {
 640                 printk(KERN_ERR "br2684_create: register_netdev failed\n");
 641                 free_netdev(netdev);
 642                 return err;
 643         }
 644
 645         write_lock_irq(&devs_lock);
 646         brdev->number = list_empty(&br2684_devs) ? 1 :
 647             BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
 648         list_add_tail(&brdev->br2684_devs, &br2684_devs);
 649         write_unlock_irq(&devs_lock);
 650         return 0;
 651 }
 652
 653 /*
 654  * This handles ioctls actually performed on our vcc - we must return
 655  * -ENOIOCTLCMD for any unrecognized ioctl
 656  */
 657 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
 658         unsigned long arg)
 659 {
 660         struct atm_vcc *atmvcc = ATM_SD(sock);
 661         void __user *argp = (void __user *)arg;
 662
 663         int err;
 664         switch(cmd) {
 665         case ATM_SETBACKEND:
 666         case ATM_NEWBACKENDIF: {
 667                 atm_backend_t b;
 668                 err = get_user(b, (atm_backend_t __user *) argp);
 669                 if (err)
 670                         return -EFAULT;
 671                 if (b != ATM_BACKEND_BR2684)
 672                         return -ENOIOCTLCMD;
 673                 if (!capable(CAP_NET_ADMIN))
 674                         return -EPERM;
 675                 if (cmd == ATM_SETBACKEND)
 676                         return br2684_regvcc(atmvcc, argp);
 677                 else
 678                         return br2684_create(argp);
 679                 }
 680 #ifdef CONFIG_ATM_BR2684_IPFILTER
 681         case BR2684_SETFILT:
 682                 if (atmvcc->push != br2684_push)
 683                         return -ENOIOCTLCMD;
 684                 if (!capable(CAP_NET_ADMIN))
 685                         return -EPERM;
 686                 err = br2684_setfilt(atmvcc, argp);
 687                 return err;
 688 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 689         }
 690         return -ENOIOCTLCMD;
 691 }
 692
 693 static struct atm_ioctl br2684_ioctl_ops = {
 694         .owner  = THIS_MODULE,
 695         .ioctl  = br2684_ioctl,
 696 };
 697
 698
 699 #ifdef CONFIG_PROC_FS
 700 static void *br2684_seq_start(struct seq_file *seq, loff_t *pos)
 701 {
 702         loff_t offs = 0;
 703         struct br2684_dev *brd;
 704
 705         read_lock(&devs_lock);
 706
 707         list_for_each_entry(brd, &br2684_devs, br2684_devs) {
 708                 if (offs == *pos)
 709                         return brd;
 710                 ++offs;
 711         }
 712         return NULL;
 713 }
 714
 715 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 716 {
 717         struct br2684_dev *brd = v;
 718
 719         ++*pos;
 720
 721         brd = list_entry(brd->br2684_devs.next,
 722                          struct br2684_dev, br2684_devs);
 723         return (&brd->br2684_devs != &br2684_devs) ? brd : NULL;
 724 }
 725
 726 static void br2684_seq_stop(struct seq_file *seq, void *v)
 727 {
 728         read_unlock(&devs_lock);
 729 }
 730
 731 static int br2684_seq_show(struct seq_file *seq, void *v)
 732 {
 733         const struct br2684_dev *brdev = v;
 734         const struct net_device *net_dev = brdev->net_dev;
 735         const struct br2684_vcc *brvcc;
 736
 737         seq_printf(seq, "dev %.16s: num=%d, mac=%02X:%02X:"
 738                        "%02X:%02X:%02X:%02X (%s)\n", net_dev->name,
 739                        brdev->number,
 740                        net_dev->dev_addr[0],
 741                        net_dev->dev_addr[1],
 742                        net_dev->dev_addr[2],
 743                        net_dev->dev_addr[3],
 744                        net_dev->dev_addr[4],
 745                        net_dev->dev_addr[5],
 746                        brdev->mac_was_set ? "set" : "auto");
 747
 748         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
 749                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s"
 750 #ifndef FASTER_VERSION
 751                                     ", failed copies %u/%u"
 752 #endif /* FASTER_VERSION */
 753                                     "\n", brvcc->atmvcc->dev->number,
 754                                     brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
 755                                     (brvcc->encaps == e_llc) ? "LLC" : "VC"
 756 #ifndef FASTER_VERSION
 757                                     , brvcc->copies_failed
 758                                     , brvcc->copies_needed
 759 #endif /* FASTER_VERSION */
 760                                     );
 761 #ifdef CONFIG_ATM_BR2684_IPFILTER
 762 #define b1(var, byte)   ((u8 *) &brvcc->filter.var)[byte]
 763 #define bs(var)         b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
 764                         if (brvcc->filter.netmask != 0)
 765                                 seq_printf(seq, "    filter=%d.%d.%d.%d/"
 766                                                 "%d.%d.%d.%d\n",
 767                                                 bs(prefix), bs(netmask));
 768 #undef bs
 769 #undef b1
 770 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 771         }
 772         return 0;
 773 }
 774
 775 static struct seq_operations br2684_seq_ops = {
 776         .start = br2684_seq_start,
 777         .next  = br2684_seq_next,
 778         .stop  = br2684_seq_stop,
 779         .show  = br2684_seq_show,
 780 };
 781
 782 static int br2684_proc_open(struct inode *inode, struct file *file)
 783 {
 784         return seq_open(file, &br2684_seq_ops);
 785 }
 786
 787 static struct file_operations br2684_proc_ops = {
 788         .owner   = THIS_MODULE,
 789         .open    = br2684_proc_open,
 790         .read    = seq_read,
 791         .llseek  = seq_lseek,
 792         .release = seq_release,
 793 };
 794
 795 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
 796 #endif
 797
 798 static int __init br2684_init(void)
 799 {
 800 #ifdef CONFIG_PROC_FS
 801         struct proc_dir_entry *p;
 802         if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
 803                 return -ENOMEM;
 804         p->proc_fops = &br2684_proc_ops;
 805 #endif
 806         register_atm_ioctl(&br2684_ioctl_ops);
 807         return 0;
 808 }
 809
 810 static void __exit br2684_exit(void)
 811 {
 812         struct net_device *net_dev;
 813         struct br2684_dev *brdev;
 814         struct br2684_vcc *brvcc;
 815         deregister_atm_ioctl(&br2684_ioctl_ops);
 816
 817 #ifdef CONFIG_PROC_FS
 818         remove_proc_entry("br2684", atm_proc_root);
 819 #endif
 820
 821         while (!list_empty(&br2684_devs)) {
 822                 net_dev = list_entry_brdev(br2684_devs.next);
 823                 brdev = BRPRIV(net_dev);
 824                 while (!list_empty(&brdev->brvccs)) {
 825                         brvcc = list_entry_brvcc(brdev->brvccs.next);
 826                         br2684_close_vcc(brvcc);
 827                 }
 828
 829                 list_del(&brdev->br2684_devs);
 830                 unregister_netdev(net_dev);
 831                 free_netdev(net_dev);
 832         }
 833 }
 834
 835 module_init(br2684_init);
 836 module_exit(br2684_exit);
 837
 838 MODULE_AUTHOR("Marcell GAL");
 839 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
 840 MODULE_LICENSE("GPL");