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 SKB_DEBUG 38 static void skb_debug(const struct sk_buff *skb) 39 { 40 #define NUM2PRINT 50 41 char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ 42 int i = 0; 43 for (i = 0; i < skb->len && i < NUM2PRINT; i++) { 44 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); 45 } 46 printk(KERN_DEBUG "br2684: skb: %s\n", buf); 47 } 48 #else 49 #define skb_debug(skb) do {} while (0) 50 #endif 51 52 static unsigned char llc_oui_pid_pad[] = 53 { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 }; 54 #define PADLEN (2) 55 56 enum br2684_encaps { 57 e_vc = BR2684_ENCAPS_VC, 58 e_llc = BR2684_ENCAPS_LLC, 59 }; 60 61 struct br2684_vcc { 62 struct atm_vcc *atmvcc; 63 struct net_device *device; 64 /* keep old push,pop functions for chaining */ 65 void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb); 66 /* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */ 67 enum br2684_encaps encaps; 68 struct list_head brvccs; 69 #ifdef CONFIG_ATM_BR2684_IPFILTER 70 struct br2684_filter filter; 71 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 72 #ifndef FASTER_VERSION 73 unsigned copies_needed, copies_failed; 74 #endif /* FASTER_VERSION */ 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 struct net_device_stats stats; 83 int mac_was_set; 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 *) net_dev->priv; 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 /* 142 * Send a packet out a particular vcc. Not to useful right now, but paves 143 * the way for multiple vcc's per itf. Returns true if we can send, 144 * otherwise false 145 */ 146 static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, 147 struct br2684_vcc *brvcc) 148 { 149 struct atm_vcc *atmvcc; 150 #ifdef FASTER_VERSION 151 if (brvcc->encaps == e_llc) 152 memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8); 153 /* last 2 bytes of llc_oui_pid_pad are managed by header routines; 154 yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad) 155 */ 156 #else 157 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; 158 if (skb_headroom(skb) < minheadroom) { 159 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); 160 brvcc->copies_needed++; 161 dev_kfree_skb(skb); 162 if (skb2 == NULL) { 163 brvcc->copies_failed++; 164 return 0; 165 } 166 skb = skb2; 167 } 168 skb_push(skb, minheadroom); 169 if (brvcc->encaps == e_llc) 170 skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10); 171 else 172 memset(skb->data, 0, 2); 173 #endif /* FASTER_VERSION */ 174 skb_debug(skb); 175 176 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; 177 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); 178 if (!atm_may_send(atmvcc, skb->truesize)) { 179 /* we free this here for now, because we cannot know in a higher 180 layer whether the skb point it supplied wasn't freed yet. 181 now, it always is. 182 */ 183 dev_kfree_skb(skb); 184 return 0; 185 } 186 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); 187 ATM_SKB(skb)->atm_options = atmvcc->atm_options; 188 brdev->stats.tx_packets++; 189 brdev->stats.tx_bytes += skb->len; 190 atmvcc->send(atmvcc, skb); 191 return 1; 192 } 193 194 static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, 195 struct br2684_dev *brdev) 196 { 197 return list_empty(&brdev->brvccs) ? NULL : 198 list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ 199 } 200 201 static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) 202 { 203 struct br2684_dev *brdev = BRPRIV(dev); 204 struct br2684_vcc *brvcc; 205 206 pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst); 207 read_lock(&devs_lock); 208 brvcc = pick_outgoing_vcc(skb, brdev); 209 if (brvcc == NULL) { 210 pr_debug("no vcc attached to dev %s\n", dev->name); 211 brdev->stats.tx_errors++; 212 brdev->stats.tx_carrier_errors++; 213 /* netif_stop_queue(dev); */ 214 dev_kfree_skb(skb); 215 read_unlock(&devs_lock); 216 return 0; 217 } 218 if (!br2684_xmit_vcc(skb, brdev, brvcc)) { 219 /* 220 * We should probably use netif_*_queue() here, but that 221 * involves added complication. We need to walk before 222 * we can run 223 */ 224 /* don't free here! this pointer might be no longer valid! 225 dev_kfree_skb(skb); 226 */ 227 brdev->stats.tx_errors++; 228 brdev->stats.tx_fifo_errors++; 229 } 230 read_unlock(&devs_lock); 231 return 0; 232 } 233 234 static struct net_device_stats *br2684_get_stats(struct net_device *dev) 235 { 236 pr_debug("br2684_get_stats\n"); 237 return &BRPRIV(dev)->stats; 238 } 239 240 #ifdef FASTER_VERSION 241 /* 242 * These mirror eth_header and eth_header_cache. They are not usually 243 * exported for use in modules, so we grab them from net_device 244 * after ether_setup() is done with it. Bit of a hack. 245 */ 246 static int (*my_eth_header)(struct sk_buff *, struct net_device *, 247 unsigned short, void *, void *, unsigned); 248 static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *); 249 250 static int 251 br2684_header(struct sk_buff *skb, struct net_device *dev, 252 unsigned short type, void *daddr, void *saddr, unsigned len) 253 { 254 u16 *pad_before_eth; 255 int t = my_eth_header(skb, dev, type, daddr, saddr, len); 256 if (t > 0) { 257 pad_before_eth = (u16 *) skb_push(skb, 2); 258 *pad_before_eth = 0; 259 return dev->hard_header_len; /* or return 16; ? */ 260 } else 261 return t; 262 } 263 264 static int 265 br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh) 266 { 267 /* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so 268 xmit will add the additional header part in that case */ 269 u16 *pad_before_eth = (u16 *)(hh->hh_data); 270 int t = my_eth_header_cache(neigh, hh); 271 DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh); 272 if (t < 0) 273 return t; 274 else { 275 *pad_before_eth = 0; 276 hh->hh_len = PADLEN + ETH_HLEN; 277 } 278 return 0; 279 } 280 281 /* 282 * This is similar to eth_type_trans, which cannot be used because of 283 * our dev->hard_header_len 284 */ 285 static inline __be16 br_type_trans(struct sk_buff *skb, struct net_device *dev) 286 { 287 struct ethhdr *eth; 288 unsigned char *rawp; 289 eth = eth_hdr(skb); 290 291 if (is_multicast_ether_addr(eth->h_dest)) { 292 if (!compare_ether_addr(eth->h_dest, dev->broadcast)) 293 skb->pkt_type = PACKET_BROADCAST; 294 else 295 skb->pkt_type = PACKET_MULTICAST; 296 } 297 298 else if (compare_ether_addr(eth->h_dest, dev->dev_addr)) 299 skb->pkt_type = PACKET_OTHERHOST; 300 301 if (ntohs(eth->h_proto) >= 1536) 302 return eth->h_proto; 303 304 rawp = skb->data; 305 306 /* 307 * This is a magic hack to spot IPX packets. Older Novell breaks 308 * the protocol design and runs IPX over 802.3 without an 802.2 LLC 309 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This 310 * won't work for fault tolerant netware but does for the rest. 311 */ 312 if (*(unsigned short *) rawp == 0xFFFF) 313 return htons(ETH_P_802_3); 314 315 /* 316 * Real 802.2 LLC 317 */ 318 return htons(ETH_P_802_2); 319 } 320 #endif /* FASTER_VERSION */ 321 322 /* 323 * We remember when the MAC gets set, so we don't override it later with 324 * the ESI of the ATM card of the first VC 325 */ 326 static int (*my_eth_mac_addr)(struct net_device *, void *); 327 static int br2684_mac_addr(struct net_device *dev, void *p) 328 { 329 int err = my_eth_mac_addr(dev, p); 330 if (!err) 331 BRPRIV(dev)->mac_was_set = 1; 332 return err; 333 } 334 335 #ifdef CONFIG_ATM_BR2684_IPFILTER 336 /* this IOCTL is experimental. */ 337 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg) 338 { 339 struct br2684_vcc *brvcc; 340 struct br2684_filter_set fs; 341 342 if (copy_from_user(&fs, arg, sizeof fs)) 343 return -EFAULT; 344 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { 345 /* 346 * This is really a per-vcc thing, but we can also search 347 * by device 348 */ 349 struct br2684_dev *brdev; 350 read_lock(&devs_lock); 351 brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); 352 if (brdev == NULL || list_empty(&brdev->brvccs) || 353 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ 354 brvcc = NULL; 355 else 356 brvcc = list_entry_brvcc(brdev->brvccs.next); 357 read_unlock(&devs_lock); 358 if (brvcc == NULL) 359 return -ESRCH; 360 } else 361 brvcc = BR2684_VCC(atmvcc); 362 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); 363 return 0; 364 } 365 366 /* Returns 1 if packet should be dropped */ 367 static inline int 368 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) 369 { 370 if (brvcc->filter.netmask == 0) 371 return 0; /* no filter in place */ 372 if (type == htons(ETH_P_IP) && 373 (((struct iphdr *) (skb->data))->daddr & brvcc->filter. 374 netmask) == brvcc->filter.prefix) 375 return 0; 376 if (type == htons(ETH_P_ARP)) 377 return 0; 378 /* TODO: we should probably filter ARPs too.. don't want to have 379 * them returning values that don't make sense, or is that ok? 380 */ 381 return 1; /* drop */ 382 } 383 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 384 385 static void br2684_close_vcc(struct br2684_vcc *brvcc) 386 { 387 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); 388 write_lock_irq(&devs_lock); 389 list_del(&brvcc->brvccs); 390 write_unlock_irq(&devs_lock); 391 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ 392 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ 393 kfree(brvcc); 394 module_put(THIS_MODULE); 395 } 396 397 /* when AAL5 PDU comes in: */ 398 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 399 { 400 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 401 struct net_device *net_dev = brvcc->device; 402 struct br2684_dev *brdev = BRPRIV(net_dev); 403 int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN; 404 405 pr_debug("br2684_push\n"); 406 407 if (unlikely(skb == NULL)) { 408 /* skb==NULL means VCC is being destroyed */ 409 br2684_close_vcc(brvcc); 410 if (list_empty(&brdev->brvccs)) { 411 read_lock(&devs_lock); 412 list_del(&brdev->br2684_devs); 413 read_unlock(&devs_lock); 414 unregister_netdev(net_dev); 415 free_netdev(net_dev); 416 } 417 return; 418 } 419 420 skb_debug(skb); 421 atm_return(atmvcc, skb->truesize); 422 pr_debug("skb from brdev %p\n", brdev); 423 if (brvcc->encaps == e_llc) { 424 /* let us waste some time for checking the encapsulation. 425 Note, that only 7 char is checked so frames with a valid FCS 426 are also accepted (but FCS is not checked of course) */ 427 if (memcmp(skb->data, llc_oui_pid_pad, 7)) { 428 brdev->stats.rx_errors++; 429 dev_kfree_skb(skb); 430 return; 431 } 432 433 /* Strip FCS if present */ 434 if (skb->len > 7 && skb->data[7] == 0x01) 435 __skb_trim(skb, skb->len - 4); 436 } else { 437 plen = PADLEN + ETH_HLEN; /* pad, dstmac,srcmac, ethtype */ 438 /* first 2 chars should be 0 */ 439 if (*((u16 *) (skb->data)) != 0) { 440 brdev->stats.rx_errors++; 441 dev_kfree_skb(skb); 442 return; 443 } 444 } 445 if (skb->len < plen) { 446 brdev->stats.rx_errors++; 447 dev_kfree_skb(skb); /* dev_ not needed? */ 448 return; 449 } 450 451 #ifdef FASTER_VERSION 452 /* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier, 453 than should be. What else should I set? */ 454 skb_pull(skb, plen); 455 skb_set_mac_header(skb, -ETH_HLEN); 456 skb->pkt_type = PACKET_HOST; 457 skb->protocol = br_type_trans(skb, net_dev); 458 #else 459 skb_pull(skb, plen - ETH_HLEN); 460 skb->protocol = eth_type_trans(skb, net_dev); 461 #endif /* FASTER_VERSION */ 462 #ifdef CONFIG_ATM_BR2684_IPFILTER 463 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { 464 brdev->stats.rx_dropped++; 465 dev_kfree_skb(skb); 466 return; 467 } 468 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 469 skb->dev = net_dev; 470 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 471 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 472 skb_debug(skb); 473 if (unlikely(!(net_dev->flags & IFF_UP))) { 474 /* sigh, interface is down */ 475 brdev->stats.rx_dropped++; 476 dev_kfree_skb(skb); 477 return; 478 } 479 brdev->stats.rx_packets++; 480 brdev->stats.rx_bytes += skb->len; 481 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 482 netif_rx(skb); 483 } 484 485 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg) 486 { 487 /* assign a vcc to a dev 488 Note: we do not have explicit unassign, but look at _push() 489 */ 490 int err; 491 struct br2684_vcc *brvcc; 492 struct sk_buff *skb; 493 struct sk_buff_head *rq; 494 struct br2684_dev *brdev; 495 struct net_device *net_dev; 496 struct atm_backend_br2684 be; 497 unsigned long flags; 498 499 if (copy_from_user(&be, arg, sizeof be)) 500 return -EFAULT; 501 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 502 if (!brvcc) 503 return -ENOMEM; 504 write_lock_irq(&devs_lock); 505 net_dev = br2684_find_dev(&be.ifspec); 506 if (net_dev == NULL) { 507 printk(KERN_ERR 508 "br2684: tried to attach to non-existant device\n"); 509 err = -ENXIO; 510 goto error; 511 } 512 brdev = BRPRIV(net_dev); 513 if (atmvcc->push == NULL) { 514 err = -EBADFD; 515 goto error; 516 } 517 if (!list_empty(&brdev->brvccs)) { 518 /* Only 1 VCC/dev right now */ 519 err = -EEXIST; 520 goto error; 521 } 522 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || 523 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != 524 BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) || 525 be.min_size != 0) { 526 err = -EINVAL; 527 goto error; 528 } 529 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, 530 brvcc); 531 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 532 unsigned char *esi = atmvcc->dev->esi; 533 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 534 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 535 else 536 net_dev->dev_addr[2] = 1; 537 } 538 list_add(&brvcc->brvccs, &brdev->brvccs); 539 write_unlock_irq(&devs_lock); 540 brvcc->device = net_dev; 541 brvcc->atmvcc = atmvcc; 542 atmvcc->user_back = brvcc; 543 brvcc->encaps = (enum br2684_encaps) be.encaps; 544 brvcc->old_push = atmvcc->push; 545 barrier(); 546 atmvcc->push = br2684_push; 547 548 rq = &sk_atm(atmvcc)->sk_receive_queue; 549 550 spin_lock_irqsave(&rq->lock, flags); 551 if (skb_queue_empty(rq)) { 552 skb = NULL; 553 } else { 554 /* NULL terminate the list. */ 555 rq->prev->next = NULL; 556 skb = rq->next; 557 } 558 rq->prev = rq->next = (struct sk_buff *)rq; 559 rq->qlen = 0; 560 spin_unlock_irqrestore(&rq->lock, flags); 561 562 while (skb) { 563 struct sk_buff *next = skb->next; 564 565 skb->next = skb->prev = NULL; 566 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; 567 BRPRIV(skb->dev)->stats.rx_packets--; 568 br2684_push(atmvcc, skb); 569 570 skb = next; 571 } 572 __module_get(THIS_MODULE); 573 return 0; 574 error: 575 write_unlock_irq(&devs_lock); 576 kfree(brvcc); 577 return err; 578 } 579 580 static void br2684_setup(struct net_device *netdev) 581 { 582 struct br2684_dev *brdev = BRPRIV(netdev); 583 584 ether_setup(netdev); 585 brdev->net_dev = netdev; 586 587 #ifdef FASTER_VERSION 588 my_eth_header = netdev->hard_header; 589 netdev->hard_header = br2684_header; 590 my_eth_header_cache = netdev->hard_header_cache; 591 netdev->hard_header_cache = br2684_header_cache; 592 netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN; /* 10 + 14 */ 593 #endif 594 my_eth_mac_addr = netdev->set_mac_address; 595 netdev->set_mac_address = br2684_mac_addr; 596 netdev->hard_start_xmit = br2684_start_xmit; 597 netdev->get_stats = br2684_get_stats; 598 599 INIT_LIST_HEAD(&brdev->brvccs); 600 } 601 602 static int br2684_create(void __user *arg) 603 { 604 int err; 605 struct net_device *netdev; 606 struct br2684_dev *brdev; 607 struct atm_newif_br2684 ni; 608 609 pr_debug("br2684_create\n"); 610 611 if (copy_from_user(&ni, arg, sizeof ni)) { 612 return -EFAULT; 613 } 614 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { 615 return -EINVAL; 616 } 617 618 netdev = alloc_netdev(sizeof(struct br2684_dev), 619 ni.ifname[0] ? ni.ifname : "nas%d", 620 br2684_setup); 621 if (!netdev) 622 return -ENOMEM; 623 624 brdev = BRPRIV(netdev); 625 626 pr_debug("registered netdev %s\n", netdev->name); 627 /* open, stop, do_ioctl ? */ 628 err = register_netdev(netdev); 629 if (err < 0) { 630 printk(KERN_ERR "br2684_create: register_netdev failed\n"); 631 free_netdev(netdev); 632 return err; 633 } 634 635 write_lock_irq(&devs_lock); 636 brdev->number = list_empty(&br2684_devs) ? 1 : 637 BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; 638 list_add_tail(&brdev->br2684_devs, &br2684_devs); 639 write_unlock_irq(&devs_lock); 640 return 0; 641 } 642 643 /* 644 * This handles ioctls actually performed on our vcc - we must return 645 * -ENOIOCTLCMD for any unrecognized ioctl 646 */ 647 static int br2684_ioctl(struct socket *sock, unsigned int cmd, 648 unsigned long arg) 649 { 650 struct atm_vcc *atmvcc = ATM_SD(sock); 651 void __user *argp = (void __user *)arg; 652 653 int err; 654 switch(cmd) { 655 case ATM_SETBACKEND: 656 case ATM_NEWBACKENDIF: { 657 atm_backend_t b; 658 err = get_user(b, (atm_backend_t __user *) argp); 659 if (err) 660 return -EFAULT; 661 if (b != ATM_BACKEND_BR2684) 662 return -ENOIOCTLCMD; 663 if (!capable(CAP_NET_ADMIN)) 664 return -EPERM; 665 if (cmd == ATM_SETBACKEND) 666 return br2684_regvcc(atmvcc, argp); 667 else 668 return br2684_create(argp); 669 } 670 #ifdef CONFIG_ATM_BR2684_IPFILTER 671 case BR2684_SETFILT: 672 if (atmvcc->push != br2684_push) 673 return -ENOIOCTLCMD; 674 if (!capable(CAP_NET_ADMIN)) 675 return -EPERM; 676 err = br2684_setfilt(atmvcc, argp); 677 return err; 678 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 679 } 680 return -ENOIOCTLCMD; 681 } 682 683 static struct atm_ioctl br2684_ioctl_ops = { 684 .owner = THIS_MODULE, 685 .ioctl = br2684_ioctl, 686 }; 687 688 689 #ifdef CONFIG_PROC_FS 690 static void *br2684_seq_start(struct seq_file *seq, loff_t *pos) 691 { 692 read_lock(&devs_lock); 693 return seq_list_start(&br2684_devs, *pos); 694 } 695 696 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos) 697 { 698 return seq_list_next(v, &br2684_devs, pos); 699 } 700 701 static void br2684_seq_stop(struct seq_file *seq, void *v) 702 { 703 read_unlock(&devs_lock); 704 } 705 706 static int br2684_seq_show(struct seq_file *seq, void *v) 707 { 708 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, 709 br2684_devs); 710 const struct net_device *net_dev = brdev->net_dev; 711 const struct br2684_vcc *brvcc; 712 DECLARE_MAC_BUF(mac); 713 714 seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n", 715 net_dev->name, 716 brdev->number, 717 print_mac(mac, net_dev->dev_addr), 718 brdev->mac_was_set ? "set" : "auto"); 719 720 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { 721 seq_printf(seq, " vcc %d.%d.%d: encaps=%s" 722 #ifndef FASTER_VERSION 723 ", failed copies %u/%u" 724 #endif /* FASTER_VERSION */ 725 "\n", brvcc->atmvcc->dev->number, 726 brvcc->atmvcc->vpi, brvcc->atmvcc->vci, 727 (brvcc->encaps == e_llc) ? "LLC" : "VC" 728 #ifndef FASTER_VERSION 729 , brvcc->copies_failed 730 , brvcc->copies_needed 731 #endif /* FASTER_VERSION */ 732 ); 733 #ifdef CONFIG_ATM_BR2684_IPFILTER 734 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] 735 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) 736 if (brvcc->filter.netmask != 0) 737 seq_printf(seq, " filter=%d.%d.%d.%d/" 738 "%d.%d.%d.%d\n", 739 bs(prefix), bs(netmask)); 740 #undef bs 741 #undef b1 742 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 743 } 744 return 0; 745 } 746 747 static const struct seq_operations br2684_seq_ops = { 748 .start = br2684_seq_start, 749 .next = br2684_seq_next, 750 .stop = br2684_seq_stop, 751 .show = br2684_seq_show, 752 }; 753 754 static int br2684_proc_open(struct inode *inode, struct file *file) 755 { 756 return seq_open(file, &br2684_seq_ops); 757 } 758 759 static const struct file_operations br2684_proc_ops = { 760 .owner = THIS_MODULE, 761 .open = br2684_proc_open, 762 .read = seq_read, 763 .llseek = seq_lseek, 764 .release = seq_release, 765 }; 766 767 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 768 #endif 769 770 static int __init br2684_init(void) 771 { 772 #ifdef CONFIG_PROC_FS 773 struct proc_dir_entry *p; 774 if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL) 775 return -ENOMEM; 776 p->proc_fops = &br2684_proc_ops; 777 #endif 778 register_atm_ioctl(&br2684_ioctl_ops); 779 return 0; 780 } 781 782 static void __exit br2684_exit(void) 783 { 784 struct net_device *net_dev; 785 struct br2684_dev *brdev; 786 struct br2684_vcc *brvcc; 787 deregister_atm_ioctl(&br2684_ioctl_ops); 788 789 #ifdef CONFIG_PROC_FS 790 remove_proc_entry("br2684", atm_proc_root); 791 #endif 792 793 while (!list_empty(&br2684_devs)) { 794 net_dev = list_entry_brdev(br2684_devs.next); 795 brdev = BRPRIV(net_dev); 796 while (!list_empty(&brdev->brvccs)) { 797 brvcc = list_entry_brvcc(brdev->brvccs.next); 798 br2684_close_vcc(brvcc); 799 } 800 801 list_del(&brdev->br2684_devs); 802 unregister_netdev(net_dev); 803 free_netdev(net_dev); 804 } 805 } 806 807 module_init(br2684_init); 808 module_exit(br2684_exit); 809 810 MODULE_AUTHOR("Marcell GAL"); 811 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 812 MODULE_LICENSE("GPL"); 813