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 <linux/slab.h> 22 #include <net/arp.h> 23 #include <linux/atm.h> 24 #include <linux/atmdev.h> 25 #include <linux/capability.h> 26 #include <linux/seq_file.h> 27 28 #include <linux/atmbr2684.h> 29 30 #include "common.h" 31 32 static void skb_debug(const struct sk_buff *skb) 33 { 34 #ifdef SKB_DEBUG 35 #define NUM2PRINT 50 36 print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, 37 16, 1, skb->data, min(NUM2PRINT, skb->len), true); 38 #endif 39 } 40 41 #define BR2684_ETHERTYPE_LEN 2 42 #define BR2684_PAD_LEN 2 43 44 #define LLC 0xaa, 0xaa, 0x03 45 #define SNAP_BRIDGED 0x00, 0x80, 0xc2 46 #define SNAP_ROUTED 0x00, 0x00, 0x00 47 #define PID_ETHERNET 0x00, 0x07 48 #define ETHERTYPE_IPV4 0x08, 0x00 49 #define ETHERTYPE_IPV6 0x86, 0xdd 50 #define PAD_BRIDGED 0x00, 0x00 51 52 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; 53 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; 54 static const unsigned char llc_oui_pid_pad[] = 55 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; 56 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; 57 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; 58 59 enum br2684_encaps { 60 e_vc = BR2684_ENCAPS_VC, 61 e_llc = BR2684_ENCAPS_LLC, 62 }; 63 64 struct br2684_vcc { 65 struct atm_vcc *atmvcc; 66 struct net_device *device; 67 /* keep old push, pop functions for chaining */ 68 void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); 69 void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); 70 enum br2684_encaps encaps; 71 struct list_head brvccs; 72 #ifdef CONFIG_ATM_BR2684_IPFILTER 73 struct br2684_filter filter; 74 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 75 unsigned copies_needed, copies_failed; 76 }; 77 78 struct br2684_dev { 79 struct net_device *net_dev; 80 struct list_head br2684_devs; 81 int number; 82 struct list_head brvccs; /* one device <=> one vcc (before xmas) */ 83 int mac_was_set; 84 enum br2684_payload payload; 85 }; 86 87 /* 88 * This lock should be held for writing any time the list of devices or 89 * their attached vcc's could be altered. It should be held for reading 90 * any time these are being queried. Note that we sometimes need to 91 * do read-locking under interrupt context, so write locking must block 92 * the current CPU's interrupts 93 */ 94 static DEFINE_RWLOCK(devs_lock); 95 96 static LIST_HEAD(br2684_devs); 97 98 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) 99 { 100 return (struct br2684_dev *)netdev_priv(net_dev); 101 } 102 103 static inline struct net_device *list_entry_brdev(const struct list_head *le) 104 { 105 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; 106 } 107 108 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) 109 { 110 return (struct br2684_vcc *)(atmvcc->user_back); 111 } 112 113 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) 114 { 115 return list_entry(le, struct br2684_vcc, brvccs); 116 } 117 118 /* Caller should hold read_lock(&devs_lock) */ 119 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) 120 { 121 struct list_head *lh; 122 struct net_device *net_dev; 123 switch (s->method) { 124 case BR2684_FIND_BYNUM: 125 list_for_each(lh, &br2684_devs) { 126 net_dev = list_entry_brdev(lh); 127 if (BRPRIV(net_dev)->number == s->spec.devnum) 128 return net_dev; 129 } 130 break; 131 case BR2684_FIND_BYIFNAME: 132 list_for_each(lh, &br2684_devs) { 133 net_dev = list_entry_brdev(lh); 134 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) 135 return net_dev; 136 } 137 break; 138 } 139 return NULL; 140 } 141 142 static int atm_dev_event(struct notifier_block *this, unsigned long event, 143 void *arg) 144 { 145 struct atm_dev *atm_dev = arg; 146 struct list_head *lh; 147 struct net_device *net_dev; 148 struct br2684_vcc *brvcc; 149 struct atm_vcc *atm_vcc; 150 unsigned long flags; 151 152 pr_debug("event=%ld dev=%p\n", event, atm_dev); 153 154 read_lock_irqsave(&devs_lock, flags); 155 list_for_each(lh, &br2684_devs) { 156 net_dev = list_entry_brdev(lh); 157 158 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { 159 atm_vcc = brvcc->atmvcc; 160 if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { 161 162 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) 163 netif_carrier_off(net_dev); 164 else 165 netif_carrier_on(net_dev); 166 167 } 168 } 169 } 170 read_unlock_irqrestore(&devs_lock, flags); 171 172 return NOTIFY_DONE; 173 } 174 175 static struct notifier_block atm_dev_notifier = { 176 .notifier_call = atm_dev_event, 177 }; 178 179 /* chained vcc->pop function. Check if we should wake the netif_queue */ 180 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) 181 { 182 struct br2684_vcc *brvcc = BR2684_VCC(vcc); 183 struct net_device *net_dev = skb->dev; 184 185 pr_debug("(vcc %p ; net_dev %p )\n", vcc, net_dev); 186 brvcc->old_pop(vcc, skb); 187 188 if (!net_dev) 189 return; 190 191 if (atm_may_send(vcc, 0)) 192 netif_wake_queue(net_dev); 193 194 } 195 /* 196 * Send a packet out a particular vcc. Not to useful right now, but paves 197 * the way for multiple vcc's per itf. Returns true if we can send, 198 * otherwise false 199 */ 200 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, 201 struct br2684_vcc *brvcc) 202 { 203 struct br2684_dev *brdev = BRPRIV(dev); 204 struct atm_vcc *atmvcc; 205 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; 206 207 if (skb_headroom(skb) < minheadroom) { 208 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); 209 brvcc->copies_needed++; 210 dev_kfree_skb(skb); 211 if (skb2 == NULL) { 212 brvcc->copies_failed++; 213 return 0; 214 } 215 skb = skb2; 216 } 217 218 if (brvcc->encaps == e_llc) { 219 if (brdev->payload == p_bridged) { 220 skb_push(skb, sizeof(llc_oui_pid_pad)); 221 skb_copy_to_linear_data(skb, llc_oui_pid_pad, 222 sizeof(llc_oui_pid_pad)); 223 } else if (brdev->payload == p_routed) { 224 unsigned short prot = ntohs(skb->protocol); 225 226 skb_push(skb, sizeof(llc_oui_ipv4)); 227 switch (prot) { 228 case ETH_P_IP: 229 skb_copy_to_linear_data(skb, llc_oui_ipv4, 230 sizeof(llc_oui_ipv4)); 231 break; 232 case ETH_P_IPV6: 233 skb_copy_to_linear_data(skb, llc_oui_ipv6, 234 sizeof(llc_oui_ipv6)); 235 break; 236 default: 237 dev_kfree_skb(skb); 238 return 0; 239 } 240 } 241 } else { /* e_vc */ 242 if (brdev->payload == p_bridged) { 243 skb_push(skb, 2); 244 memset(skb->data, 0, 2); 245 } else { /* p_routed */ 246 skb_pull(skb, ETH_HLEN); 247 } 248 } 249 skb_debug(skb); 250 251 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; 252 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); 253 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); 254 ATM_SKB(skb)->atm_options = atmvcc->atm_options; 255 dev->stats.tx_packets++; 256 dev->stats.tx_bytes += skb->len; 257 atmvcc->send(atmvcc, skb); 258 259 if (!atm_may_send(atmvcc, 0)) { 260 netif_stop_queue(brvcc->device); 261 /*check for race with br2684_pop*/ 262 if (atm_may_send(atmvcc, 0)) 263 netif_start_queue(brvcc->device); 264 } 265 266 return 1; 267 } 268 269 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, 270 const struct br2684_dev *brdev) 271 { 272 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ 273 } 274 275 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, 276 struct net_device *dev) 277 { 278 struct br2684_dev *brdev = BRPRIV(dev); 279 struct br2684_vcc *brvcc; 280 281 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); 282 read_lock(&devs_lock); 283 brvcc = pick_outgoing_vcc(skb, brdev); 284 if (brvcc == NULL) { 285 pr_debug("no vcc attached to dev %s\n", dev->name); 286 dev->stats.tx_errors++; 287 dev->stats.tx_carrier_errors++; 288 /* netif_stop_queue(dev); */ 289 dev_kfree_skb(skb); 290 read_unlock(&devs_lock); 291 return NETDEV_TX_OK; 292 } 293 if (!br2684_xmit_vcc(skb, dev, brvcc)) { 294 /* 295 * We should probably use netif_*_queue() here, but that 296 * involves added complication. We need to walk before 297 * we can run. 298 * 299 * Don't free here! this pointer might be no longer valid! 300 */ 301 dev->stats.tx_errors++; 302 dev->stats.tx_fifo_errors++; 303 } 304 read_unlock(&devs_lock); 305 return NETDEV_TX_OK; 306 } 307 308 /* 309 * We remember when the MAC gets set, so we don't override it later with 310 * the ESI of the ATM card of the first VC 311 */ 312 static int br2684_mac_addr(struct net_device *dev, void *p) 313 { 314 int err = eth_mac_addr(dev, p); 315 if (!err) 316 BRPRIV(dev)->mac_was_set = 1; 317 return err; 318 } 319 320 #ifdef CONFIG_ATM_BR2684_IPFILTER 321 /* this IOCTL is experimental. */ 322 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) 323 { 324 struct br2684_vcc *brvcc; 325 struct br2684_filter_set fs; 326 327 if (copy_from_user(&fs, arg, sizeof fs)) 328 return -EFAULT; 329 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { 330 /* 331 * This is really a per-vcc thing, but we can also search 332 * by device. 333 */ 334 struct br2684_dev *brdev; 335 read_lock(&devs_lock); 336 brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); 337 if (brdev == NULL || list_empty(&brdev->brvccs) || 338 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ 339 brvcc = NULL; 340 else 341 brvcc = list_entry_brvcc(brdev->brvccs.next); 342 read_unlock(&devs_lock); 343 if (brvcc == NULL) 344 return -ESRCH; 345 } else 346 brvcc = BR2684_VCC(atmvcc); 347 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); 348 return 0; 349 } 350 351 /* Returns 1 if packet should be dropped */ 352 static inline int 353 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) 354 { 355 if (brvcc->filter.netmask == 0) 356 return 0; /* no filter in place */ 357 if (type == htons(ETH_P_IP) && 358 (((struct iphdr *)(skb->data))->daddr & brvcc->filter. 359 netmask) == brvcc->filter.prefix) 360 return 0; 361 if (type == htons(ETH_P_ARP)) 362 return 0; 363 /* 364 * TODO: we should probably filter ARPs too.. don't want to have 365 * them returning values that don't make sense, or is that ok? 366 */ 367 return 1; /* drop */ 368 } 369 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 370 371 static void br2684_close_vcc(struct br2684_vcc *brvcc) 372 { 373 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); 374 write_lock_irq(&devs_lock); 375 list_del(&brvcc->brvccs); 376 write_unlock_irq(&devs_lock); 377 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ 378 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ 379 kfree(brvcc); 380 module_put(THIS_MODULE); 381 } 382 383 /* when AAL5 PDU comes in: */ 384 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 385 { 386 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 387 struct net_device *net_dev = brvcc->device; 388 struct br2684_dev *brdev = BRPRIV(net_dev); 389 390 pr_debug("\n"); 391 392 if (unlikely(skb == NULL)) { 393 /* skb==NULL means VCC is being destroyed */ 394 br2684_close_vcc(brvcc); 395 if (list_empty(&brdev->brvccs)) { 396 write_lock_irq(&devs_lock); 397 list_del(&brdev->br2684_devs); 398 write_unlock_irq(&devs_lock); 399 unregister_netdev(net_dev); 400 free_netdev(net_dev); 401 } 402 return; 403 } 404 405 skb_debug(skb); 406 atm_return(atmvcc, skb->truesize); 407 pr_debug("skb from brdev %p\n", brdev); 408 if (brvcc->encaps == e_llc) { 409 410 if (skb->len > 7 && skb->data[7] == 0x01) 411 __skb_trim(skb, skb->len - 4); 412 413 /* accept packets that have "ipv[46]" in the snap header */ 414 if ((skb->len >= (sizeof(llc_oui_ipv4))) && 415 (memcmp(skb->data, llc_oui_ipv4, 416 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { 417 if (memcmp(skb->data + 6, ethertype_ipv6, 418 sizeof(ethertype_ipv6)) == 0) 419 skb->protocol = htons(ETH_P_IPV6); 420 else if (memcmp(skb->data + 6, ethertype_ipv4, 421 sizeof(ethertype_ipv4)) == 0) 422 skb->protocol = htons(ETH_P_IP); 423 else 424 goto error; 425 skb_pull(skb, sizeof(llc_oui_ipv4)); 426 skb_reset_network_header(skb); 427 skb->pkt_type = PACKET_HOST; 428 /* 429 * Let us waste some time for checking the encapsulation. 430 * Note, that only 7 char is checked so frames with a valid FCS 431 * are also accepted (but FCS is not checked of course). 432 */ 433 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && 434 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { 435 skb_pull(skb, sizeof(llc_oui_pid_pad)); 436 skb->protocol = eth_type_trans(skb, net_dev); 437 } else 438 goto error; 439 440 } else { /* e_vc */ 441 if (brdev->payload == p_routed) { 442 struct iphdr *iph; 443 444 skb_reset_network_header(skb); 445 iph = ip_hdr(skb); 446 if (iph->version == 4) 447 skb->protocol = htons(ETH_P_IP); 448 else if (iph->version == 6) 449 skb->protocol = htons(ETH_P_IPV6); 450 else 451 goto error; 452 skb->pkt_type = PACKET_HOST; 453 } else { /* p_bridged */ 454 /* first 2 chars should be 0 */ 455 if (*((u16 *) (skb->data)) != 0) 456 goto error; 457 skb_pull(skb, BR2684_PAD_LEN); 458 skb->protocol = eth_type_trans(skb, net_dev); 459 } 460 } 461 462 #ifdef CONFIG_ATM_BR2684_IPFILTER 463 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) 464 goto dropped; 465 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 466 skb->dev = net_dev; 467 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 468 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 469 skb_debug(skb); 470 /* sigh, interface is down? */ 471 if (unlikely(!(net_dev->flags & IFF_UP))) 472 goto dropped; 473 net_dev->stats.rx_packets++; 474 net_dev->stats.rx_bytes += skb->len; 475 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 476 netif_rx(skb); 477 return; 478 479 dropped: 480 net_dev->stats.rx_dropped++; 481 goto free_skb; 482 error: 483 net_dev->stats.rx_errors++; 484 free_skb: 485 dev_kfree_skb(skb); 486 } 487 488 /* 489 * Assign a vcc to a dev 490 * Note: we do not have explicit unassign, but look at _push() 491 */ 492 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) 493 { 494 struct sk_buff_head queue; 495 int err; 496 struct br2684_vcc *brvcc; 497 struct sk_buff *skb, *tmp; 498 struct sk_buff_head *rq; 499 struct br2684_dev *brdev; 500 struct net_device *net_dev; 501 struct atm_backend_br2684 be; 502 unsigned long flags; 503 504 if (copy_from_user(&be, arg, sizeof be)) 505 return -EFAULT; 506 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 507 if (!brvcc) 508 return -ENOMEM; 509 write_lock_irq(&devs_lock); 510 net_dev = br2684_find_dev(&be.ifspec); 511 if (net_dev == NULL) { 512 pr_err("tried to attach to non-existant device\n"); 513 err = -ENXIO; 514 goto error; 515 } 516 brdev = BRPRIV(net_dev); 517 if (atmvcc->push == NULL) { 518 err = -EBADFD; 519 goto error; 520 } 521 if (!list_empty(&brdev->brvccs)) { 522 /* Only 1 VCC/dev right now */ 523 err = -EEXIST; 524 goto error; 525 } 526 if (be.fcs_in != BR2684_FCSIN_NO || 527 be.fcs_out != BR2684_FCSOUT_NO || 528 be.fcs_auto || be.has_vpiid || be.send_padding || 529 (be.encaps != BR2684_ENCAPS_VC && 530 be.encaps != BR2684_ENCAPS_LLC) || 531 be.min_size != 0) { 532 err = -EINVAL; 533 goto error; 534 } 535 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); 536 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 537 unsigned char *esi = atmvcc->dev->esi; 538 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 539 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 540 else 541 net_dev->dev_addr[2] = 1; 542 } 543 list_add(&brvcc->brvccs, &brdev->brvccs); 544 write_unlock_irq(&devs_lock); 545 brvcc->device = net_dev; 546 brvcc->atmvcc = atmvcc; 547 atmvcc->user_back = brvcc; 548 brvcc->encaps = (enum br2684_encaps)be.encaps; 549 brvcc->old_push = atmvcc->push; 550 brvcc->old_pop = atmvcc->pop; 551 barrier(); 552 atmvcc->push = br2684_push; 553 atmvcc->pop = br2684_pop; 554 555 __skb_queue_head_init(&queue); 556 rq = &sk_atm(atmvcc)->sk_receive_queue; 557 558 spin_lock_irqsave(&rq->lock, flags); 559 skb_queue_splice_init(rq, &queue); 560 spin_unlock_irqrestore(&rq->lock, flags); 561 562 skb_queue_walk_safe(&queue, skb, tmp) { 563 struct net_device *dev = skb->dev; 564 565 dev->stats.rx_bytes -= skb->len; 566 dev->stats.rx_packets--; 567 568 br2684_push(atmvcc, skb); 569 } 570 571 /* initialize netdev carrier state */ 572 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) 573 netif_carrier_off(net_dev); 574 else 575 netif_carrier_on(net_dev); 576 577 __module_get(THIS_MODULE); 578 return 0; 579 580 error: 581 write_unlock_irq(&devs_lock); 582 kfree(brvcc); 583 return err; 584 } 585 586 static const struct net_device_ops br2684_netdev_ops = { 587 .ndo_start_xmit = br2684_start_xmit, 588 .ndo_set_mac_address = br2684_mac_addr, 589 .ndo_change_mtu = eth_change_mtu, 590 .ndo_validate_addr = eth_validate_addr, 591 }; 592 593 static const struct net_device_ops br2684_netdev_ops_routed = { 594 .ndo_start_xmit = br2684_start_xmit, 595 .ndo_set_mac_address = br2684_mac_addr, 596 .ndo_change_mtu = eth_change_mtu 597 }; 598 599 static void br2684_setup(struct net_device *netdev) 600 { 601 struct br2684_dev *brdev = BRPRIV(netdev); 602 603 ether_setup(netdev); 604 brdev->net_dev = netdev; 605 606 netdev->netdev_ops = &br2684_netdev_ops; 607 608 INIT_LIST_HEAD(&brdev->brvccs); 609 } 610 611 static void br2684_setup_routed(struct net_device *netdev) 612 { 613 struct br2684_dev *brdev = BRPRIV(netdev); 614 615 brdev->net_dev = netdev; 616 netdev->hard_header_len = 0; 617 netdev->netdev_ops = &br2684_netdev_ops_routed; 618 netdev->addr_len = 0; 619 netdev->mtu = 1500; 620 netdev->type = ARPHRD_PPP; 621 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 622 netdev->tx_queue_len = 100; 623 INIT_LIST_HEAD(&brdev->brvccs); 624 } 625 626 static int br2684_create(void __user *arg) 627 { 628 int err; 629 struct net_device *netdev; 630 struct br2684_dev *brdev; 631 struct atm_newif_br2684 ni; 632 enum br2684_payload payload; 633 634 pr_debug("\n"); 635 636 if (copy_from_user(&ni, arg, sizeof ni)) 637 return -EFAULT; 638 639 if (ni.media & BR2684_FLAG_ROUTED) 640 payload = p_routed; 641 else 642 payload = p_bridged; 643 ni.media &= 0xffff; /* strip flags */ 644 645 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) 646 return -EINVAL; 647 648 netdev = alloc_netdev(sizeof(struct br2684_dev), 649 ni.ifname[0] ? ni.ifname : "nas%d", 650 (payload == p_routed) ? 651 br2684_setup_routed : br2684_setup); 652 if (!netdev) 653 return -ENOMEM; 654 655 brdev = BRPRIV(netdev); 656 657 pr_debug("registered netdev %s\n", netdev->name); 658 /* open, stop, do_ioctl ? */ 659 err = register_netdev(netdev); 660 if (err < 0) { 661 pr_err("register_netdev failed\n"); 662 free_netdev(netdev); 663 return err; 664 } 665 666 write_lock_irq(&devs_lock); 667 668 brdev->payload = payload; 669 670 if (list_empty(&br2684_devs)) { 671 /* 1st br2684 device */ 672 brdev->number = 1; 673 } else 674 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; 675 676 list_add_tail(&brdev->br2684_devs, &br2684_devs); 677 write_unlock_irq(&devs_lock); 678 return 0; 679 } 680 681 /* 682 * This handles ioctls actually performed on our vcc - we must return 683 * -ENOIOCTLCMD for any unrecognized ioctl 684 */ 685 static int br2684_ioctl(struct socket *sock, unsigned int cmd, 686 unsigned long arg) 687 { 688 struct atm_vcc *atmvcc = ATM_SD(sock); 689 void __user *argp = (void __user *)arg; 690 atm_backend_t b; 691 692 int err; 693 switch (cmd) { 694 case ATM_SETBACKEND: 695 case ATM_NEWBACKENDIF: 696 err = get_user(b, (atm_backend_t __user *) argp); 697 if (err) 698 return -EFAULT; 699 if (b != ATM_BACKEND_BR2684) 700 return -ENOIOCTLCMD; 701 if (!capable(CAP_NET_ADMIN)) 702 return -EPERM; 703 if (cmd == ATM_SETBACKEND) 704 return br2684_regvcc(atmvcc, argp); 705 else 706 return br2684_create(argp); 707 #ifdef CONFIG_ATM_BR2684_IPFILTER 708 case BR2684_SETFILT: 709 if (atmvcc->push != br2684_push) 710 return -ENOIOCTLCMD; 711 if (!capable(CAP_NET_ADMIN)) 712 return -EPERM; 713 err = br2684_setfilt(atmvcc, argp); 714 715 return err; 716 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 717 } 718 return -ENOIOCTLCMD; 719 } 720 721 static struct atm_ioctl br2684_ioctl_ops = { 722 .owner = THIS_MODULE, 723 .ioctl = br2684_ioctl, 724 }; 725 726 #ifdef CONFIG_PROC_FS 727 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) 728 __acquires(devs_lock) 729 { 730 read_lock(&devs_lock); 731 return seq_list_start(&br2684_devs, *pos); 732 } 733 734 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) 735 { 736 return seq_list_next(v, &br2684_devs, pos); 737 } 738 739 static void br2684_seq_stop(struct seq_file *seq, void *v) 740 __releases(devs_lock) 741 { 742 read_unlock(&devs_lock); 743 } 744 745 static int br2684_seq_show(struct seq_file *seq, void *v) 746 { 747 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, 748 br2684_devs); 749 const struct net_device *net_dev = brdev->net_dev; 750 const struct br2684_vcc *brvcc; 751 752 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", 753 net_dev->name, 754 brdev->number, 755 net_dev->dev_addr, 756 brdev->mac_was_set ? "set" : "auto"); 757 758 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { 759 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" 760 ", failed copies %u/%u" 761 "\n", brvcc->atmvcc->dev->number, 762 brvcc->atmvcc->vpi, brvcc->atmvcc->vci, 763 (brvcc->encaps == e_llc) ? "LLC" : "VC", 764 (brdev->payload == p_bridged) ? "bridged" : "routed", 765 brvcc->copies_failed, brvcc->copies_needed); 766 #ifdef CONFIG_ATM_BR2684_IPFILTER 767 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] 768 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) 769 if (brvcc->filter.netmask != 0) 770 seq_printf(seq, " filter=%d.%d.%d.%d/" 771 "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); 772 #undef bs 773 #undef b1 774 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 775 } 776 return 0; 777 } 778 779 static const struct seq_operations br2684_seq_ops = { 780 .start = br2684_seq_start, 781 .next = br2684_seq_next, 782 .stop = br2684_seq_stop, 783 .show = br2684_seq_show, 784 }; 785 786 static int br2684_proc_open(struct inode *inode, struct file *file) 787 { 788 return seq_open(file, &br2684_seq_ops); 789 } 790 791 static const struct file_operations br2684_proc_ops = { 792 .owner = THIS_MODULE, 793 .open = br2684_proc_open, 794 .read = seq_read, 795 .llseek = seq_lseek, 796 .release = seq_release, 797 }; 798 799 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 800 #endif /* CONFIG_PROC_FS */ 801 802 static int __init br2684_init(void) 803 { 804 #ifdef CONFIG_PROC_FS 805 struct proc_dir_entry *p; 806 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); 807 if (p == NULL) 808 return -ENOMEM; 809 #endif 810 register_atm_ioctl(&br2684_ioctl_ops); 811 register_atmdevice_notifier(&atm_dev_notifier); 812 return 0; 813 } 814 815 static void __exit br2684_exit(void) 816 { 817 struct net_device *net_dev; 818 struct br2684_dev *brdev; 819 struct br2684_vcc *brvcc; 820 deregister_atm_ioctl(&br2684_ioctl_ops); 821 822 #ifdef CONFIG_PROC_FS 823 remove_proc_entry("br2684", atm_proc_root); 824 #endif 825 826 827 unregister_atmdevice_notifier(&atm_dev_notifier); 828 829 while (!list_empty(&br2684_devs)) { 830 net_dev = list_entry_brdev(br2684_devs.next); 831 brdev = BRPRIV(net_dev); 832 while (!list_empty(&brdev->brvccs)) { 833 brvcc = list_entry_brvcc(brdev->brvccs.next); 834 br2684_close_vcc(brvcc); 835 } 836 837 list_del(&brdev->br2684_devs); 838 unregister_netdev(net_dev); 839 free_netdev(net_dev); 840 } 841 } 842 843 module_init(br2684_init); 844 module_exit(br2684_exit); 845 846 MODULE_AUTHOR("Marcell GAL"); 847 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 848 MODULE_LICENSE("GPL"); 849