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