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 read_lock_irq(&devs_lock); 403 if (list_empty(&br2684_devs)) { 404 /* last br2684 device */ 405 unregister_atmdevice_notifier(&atm_dev_notifier); 406 } 407 read_unlock_irq(&devs_lock); 408 return; 409 } 410 411 skb_debug(skb); 412 atm_return(atmvcc, skb->truesize); 413 pr_debug("skb from brdev %p\n", brdev); 414 if (brvcc->encaps == e_llc) { 415 416 if (skb->len > 7 && skb->data[7] == 0x01) 417 __skb_trim(skb, skb->len - 4); 418 419 /* accept packets that have "ipv[46]" in the snap header */ 420 if ((skb->len >= (sizeof(llc_oui_ipv4))) && 421 (memcmp(skb->data, llc_oui_ipv4, 422 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { 423 if (memcmp(skb->data + 6, ethertype_ipv6, 424 sizeof(ethertype_ipv6)) == 0) 425 skb->protocol = htons(ETH_P_IPV6); 426 else if (memcmp(skb->data + 6, ethertype_ipv4, 427 sizeof(ethertype_ipv4)) == 0) 428 skb->protocol = htons(ETH_P_IP); 429 else 430 goto error; 431 skb_pull(skb, sizeof(llc_oui_ipv4)); 432 skb_reset_network_header(skb); 433 skb->pkt_type = PACKET_HOST; 434 /* 435 * Let us waste some time for checking the encapsulation. 436 * Note, that only 7 char is checked so frames with a valid FCS 437 * are also accepted (but FCS is not checked of course). 438 */ 439 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && 440 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { 441 skb_pull(skb, sizeof(llc_oui_pid_pad)); 442 skb->protocol = eth_type_trans(skb, net_dev); 443 } else 444 goto error; 445 446 } else { /* e_vc */ 447 if (brdev->payload == p_routed) { 448 struct iphdr *iph; 449 450 skb_reset_network_header(skb); 451 iph = ip_hdr(skb); 452 if (iph->version == 4) 453 skb->protocol = htons(ETH_P_IP); 454 else if (iph->version == 6) 455 skb->protocol = htons(ETH_P_IPV6); 456 else 457 goto error; 458 skb->pkt_type = PACKET_HOST; 459 } else { /* p_bridged */ 460 /* first 2 chars should be 0 */ 461 if (*((u16 *) (skb->data)) != 0) 462 goto error; 463 skb_pull(skb, BR2684_PAD_LEN); 464 skb->protocol = eth_type_trans(skb, net_dev); 465 } 466 } 467 468 #ifdef CONFIG_ATM_BR2684_IPFILTER 469 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) 470 goto dropped; 471 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 472 skb->dev = net_dev; 473 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 474 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 475 skb_debug(skb); 476 /* sigh, interface is down? */ 477 if (unlikely(!(net_dev->flags & IFF_UP))) 478 goto dropped; 479 net_dev->stats.rx_packets++; 480 net_dev->stats.rx_bytes += skb->len; 481 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 482 netif_rx(skb); 483 return; 484 485 dropped: 486 net_dev->stats.rx_dropped++; 487 goto free_skb; 488 error: 489 net_dev->stats.rx_errors++; 490 free_skb: 491 dev_kfree_skb(skb); 492 } 493 494 /* 495 * Assign a vcc to a dev 496 * Note: we do not have explicit unassign, but look at _push() 497 */ 498 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) 499 { 500 struct sk_buff_head queue; 501 int err; 502 struct br2684_vcc *brvcc; 503 struct sk_buff *skb, *tmp; 504 struct sk_buff_head *rq; 505 struct br2684_dev *brdev; 506 struct net_device *net_dev; 507 struct atm_backend_br2684 be; 508 unsigned long flags; 509 510 if (copy_from_user(&be, arg, sizeof be)) 511 return -EFAULT; 512 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 513 if (!brvcc) 514 return -ENOMEM; 515 write_lock_irq(&devs_lock); 516 net_dev = br2684_find_dev(&be.ifspec); 517 if (net_dev == NULL) { 518 pr_err("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 || 533 be.fcs_out != BR2684_FCSOUT_NO || 534 be.fcs_auto || be.has_vpiid || be.send_padding || 535 (be.encaps != BR2684_ENCAPS_VC && 536 be.encaps != BR2684_ENCAPS_LLC) || 537 be.min_size != 0) { 538 err = -EINVAL; 539 goto error; 540 } 541 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); 542 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 543 unsigned char *esi = atmvcc->dev->esi; 544 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 545 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 546 else 547 net_dev->dev_addr[2] = 1; 548 } 549 list_add(&brvcc->brvccs, &brdev->brvccs); 550 write_unlock_irq(&devs_lock); 551 brvcc->device = net_dev; 552 brvcc->atmvcc = atmvcc; 553 atmvcc->user_back = brvcc; 554 brvcc->encaps = (enum br2684_encaps)be.encaps; 555 brvcc->old_push = atmvcc->push; 556 brvcc->old_pop = atmvcc->pop; 557 barrier(); 558 atmvcc->push = br2684_push; 559 atmvcc->pop = br2684_pop; 560 561 __skb_queue_head_init(&queue); 562 rq = &sk_atm(atmvcc)->sk_receive_queue; 563 564 spin_lock_irqsave(&rq->lock, flags); 565 skb_queue_splice_init(rq, &queue); 566 spin_unlock_irqrestore(&rq->lock, flags); 567 568 skb_queue_walk_safe(&queue, skb, tmp) { 569 struct net_device *dev = skb->dev; 570 571 dev->stats.rx_bytes -= skb->len; 572 dev->stats.rx_packets--; 573 574 br2684_push(atmvcc, skb); 575 } 576 577 /* initialize netdev carrier state */ 578 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) 579 netif_carrier_off(net_dev); 580 else 581 netif_carrier_on(net_dev); 582 583 __module_get(THIS_MODULE); 584 return 0; 585 586 error: 587 write_unlock_irq(&devs_lock); 588 kfree(brvcc); 589 return err; 590 } 591 592 static const struct net_device_ops br2684_netdev_ops = { 593 .ndo_start_xmit = br2684_start_xmit, 594 .ndo_set_mac_address = br2684_mac_addr, 595 .ndo_change_mtu = eth_change_mtu, 596 .ndo_validate_addr = eth_validate_addr, 597 }; 598 599 static const struct net_device_ops br2684_netdev_ops_routed = { 600 .ndo_start_xmit = br2684_start_xmit, 601 .ndo_set_mac_address = br2684_mac_addr, 602 .ndo_change_mtu = eth_change_mtu 603 }; 604 605 static void br2684_setup(struct net_device *netdev) 606 { 607 struct br2684_dev *brdev = BRPRIV(netdev); 608 609 ether_setup(netdev); 610 brdev->net_dev = netdev; 611 612 netdev->netdev_ops = &br2684_netdev_ops; 613 614 INIT_LIST_HEAD(&brdev->brvccs); 615 } 616 617 static void br2684_setup_routed(struct net_device *netdev) 618 { 619 struct br2684_dev *brdev = BRPRIV(netdev); 620 621 brdev->net_dev = netdev; 622 netdev->hard_header_len = 0; 623 netdev->netdev_ops = &br2684_netdev_ops_routed; 624 netdev->addr_len = 0; 625 netdev->mtu = 1500; 626 netdev->type = ARPHRD_PPP; 627 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 628 netdev->tx_queue_len = 100; 629 INIT_LIST_HEAD(&brdev->brvccs); 630 } 631 632 static int br2684_create(void __user *arg) 633 { 634 int err; 635 struct net_device *netdev; 636 struct br2684_dev *brdev; 637 struct atm_newif_br2684 ni; 638 enum br2684_payload payload; 639 640 pr_debug("\n"); 641 642 if (copy_from_user(&ni, arg, sizeof ni)) 643 return -EFAULT; 644 645 if (ni.media & BR2684_FLAG_ROUTED) 646 payload = p_routed; 647 else 648 payload = p_bridged; 649 ni.media &= 0xffff; /* strip flags */ 650 651 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) 652 return -EINVAL; 653 654 netdev = alloc_netdev(sizeof(struct br2684_dev), 655 ni.ifname[0] ? ni.ifname : "nas%d", 656 (payload == p_routed) ? 657 br2684_setup_routed : br2684_setup); 658 if (!netdev) 659 return -ENOMEM; 660 661 brdev = BRPRIV(netdev); 662 663 pr_debug("registered netdev %s\n", netdev->name); 664 /* open, stop, do_ioctl ? */ 665 err = register_netdev(netdev); 666 if (err < 0) { 667 pr_err("register_netdev failed\n"); 668 free_netdev(netdev); 669 return err; 670 } 671 672 write_lock_irq(&devs_lock); 673 674 brdev->payload = payload; 675 676 if (list_empty(&br2684_devs)) { 677 /* 1st br2684 device */ 678 register_atmdevice_notifier(&atm_dev_notifier); 679 brdev->number = 1; 680 } else 681 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; 682 683 list_add_tail(&brdev->br2684_devs, &br2684_devs); 684 write_unlock_irq(&devs_lock); 685 return 0; 686 } 687 688 /* 689 * This handles ioctls actually performed on our vcc - we must return 690 * -ENOIOCTLCMD for any unrecognized ioctl 691 */ 692 static int br2684_ioctl(struct socket *sock, unsigned int cmd, 693 unsigned long arg) 694 { 695 struct atm_vcc *atmvcc = ATM_SD(sock); 696 void __user *argp = (void __user *)arg; 697 atm_backend_t b; 698 699 int err; 700 switch (cmd) { 701 case ATM_SETBACKEND: 702 case ATM_NEWBACKENDIF: 703 err = get_user(b, (atm_backend_t __user *) argp); 704 if (err) 705 return -EFAULT; 706 if (b != ATM_BACKEND_BR2684) 707 return -ENOIOCTLCMD; 708 if (!capable(CAP_NET_ADMIN)) 709 return -EPERM; 710 if (cmd == ATM_SETBACKEND) 711 return br2684_regvcc(atmvcc, argp); 712 else 713 return br2684_create(argp); 714 #ifdef CONFIG_ATM_BR2684_IPFILTER 715 case BR2684_SETFILT: 716 if (atmvcc->push != br2684_push) 717 return -ENOIOCTLCMD; 718 if (!capable(CAP_NET_ADMIN)) 719 return -EPERM; 720 err = br2684_setfilt(atmvcc, argp); 721 722 return err; 723 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 724 } 725 return -ENOIOCTLCMD; 726 } 727 728 static struct atm_ioctl br2684_ioctl_ops = { 729 .owner = THIS_MODULE, 730 .ioctl = br2684_ioctl, 731 }; 732 733 #ifdef CONFIG_PROC_FS 734 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) 735 __acquires(devs_lock) 736 { 737 read_lock(&devs_lock); 738 return seq_list_start(&br2684_devs, *pos); 739 } 740 741 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) 742 { 743 return seq_list_next(v, &br2684_devs, pos); 744 } 745 746 static void br2684_seq_stop(struct seq_file *seq, void *v) 747 __releases(devs_lock) 748 { 749 read_unlock(&devs_lock); 750 } 751 752 static int br2684_seq_show(struct seq_file *seq, void *v) 753 { 754 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, 755 br2684_devs); 756 const struct net_device *net_dev = brdev->net_dev; 757 const struct br2684_vcc *brvcc; 758 759 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", 760 net_dev->name, 761 brdev->number, 762 net_dev->dev_addr, 763 brdev->mac_was_set ? "set" : "auto"); 764 765 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { 766 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" 767 ", failed copies %u/%u" 768 "\n", brvcc->atmvcc->dev->number, 769 brvcc->atmvcc->vpi, brvcc->atmvcc->vci, 770 (brvcc->encaps == e_llc) ? "LLC" : "VC", 771 (brdev->payload == p_bridged) ? "bridged" : "routed", 772 brvcc->copies_failed, brvcc->copies_needed); 773 #ifdef CONFIG_ATM_BR2684_IPFILTER 774 #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] 775 #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) 776 if (brvcc->filter.netmask != 0) 777 seq_printf(seq, " filter=%d.%d.%d.%d/" 778 "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); 779 #undef bs 780 #undef b1 781 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 782 } 783 return 0; 784 } 785 786 static const struct seq_operations br2684_seq_ops = { 787 .start = br2684_seq_start, 788 .next = br2684_seq_next, 789 .stop = br2684_seq_stop, 790 .show = br2684_seq_show, 791 }; 792 793 static int br2684_proc_open(struct inode *inode, struct file *file) 794 { 795 return seq_open(file, &br2684_seq_ops); 796 } 797 798 static const struct file_operations br2684_proc_ops = { 799 .owner = THIS_MODULE, 800 .open = br2684_proc_open, 801 .read = seq_read, 802 .llseek = seq_lseek, 803 .release = seq_release, 804 }; 805 806 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 807 #endif /* CONFIG_PROC_FS */ 808 809 static int __init br2684_init(void) 810 { 811 #ifdef CONFIG_PROC_FS 812 struct proc_dir_entry *p; 813 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); 814 if (p == NULL) 815 return -ENOMEM; 816 #endif 817 register_atm_ioctl(&br2684_ioctl_ops); 818 return 0; 819 } 820 821 static void __exit br2684_exit(void) 822 { 823 struct net_device *net_dev; 824 struct br2684_dev *brdev; 825 struct br2684_vcc *brvcc; 826 deregister_atm_ioctl(&br2684_ioctl_ops); 827 828 #ifdef CONFIG_PROC_FS 829 remove_proc_entry("br2684", atm_proc_root); 830 #endif 831 832 833 /* if not already empty */ 834 if (!list_empty(&br2684_devs)) 835 unregister_atmdevice_notifier(&atm_dev_notifier); 836 837 while (!list_empty(&br2684_devs)) { 838 net_dev = list_entry_brdev(br2684_devs.next); 839 brdev = BRPRIV(net_dev); 840 while (!list_empty(&brdev->brvccs)) { 841 brvcc = list_entry_brvcc(brdev->brvccs.next); 842 br2684_close_vcc(brvcc); 843 } 844 845 list_del(&brdev->br2684_devs); 846 unregister_netdev(net_dev); 847 free_netdev(net_dev); 848 } 849 } 850 851 module_init(br2684_init); 852 module_exit(br2684_exit); 853 854 MODULE_AUTHOR("Marcell GAL"); 855 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 856 MODULE_LICENSE("GPL"); 857