br2684.c revision fbe5e29ec1886967255e76946aaf537b8cc9b81e
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 32static 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 52static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; 53static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; 54static const unsigned char llc_oui_pid_pad[] = 55 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; 56static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; 57static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; 58 59enum br2684_encaps { 60 e_vc = BR2684_ENCAPS_VC, 61 e_llc = BR2684_ENCAPS_LLC, 62}; 63 64struct 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 78struct 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 */ 94static DEFINE_RWLOCK(devs_lock); 95 96static LIST_HEAD(br2684_devs); 97 98static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) 99{ 100 return netdev_priv(net_dev); 101} 102 103static 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 108static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) 109{ 110 return (struct br2684_vcc *)(atmvcc->user_back); 111} 112 113static 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) */ 119static 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 142static 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 175static 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 */ 180static 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 */ 200static 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 } 246 } 247 skb_debug(skb); 248 249 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; 250 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); 251 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); 252 ATM_SKB(skb)->atm_options = atmvcc->atm_options; 253 dev->stats.tx_packets++; 254 dev->stats.tx_bytes += skb->len; 255 atmvcc->send(atmvcc, skb); 256 257 if (!atm_may_send(atmvcc, 0)) { 258 netif_stop_queue(brvcc->device); 259 /*check for race with br2684_pop*/ 260 if (atm_may_send(atmvcc, 0)) 261 netif_start_queue(brvcc->device); 262 } 263 264 return 1; 265} 266 267static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, 268 const struct br2684_dev *brdev) 269{ 270 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ 271} 272 273static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, 274 struct net_device *dev) 275{ 276 struct br2684_dev *brdev = BRPRIV(dev); 277 struct br2684_vcc *brvcc; 278 279 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); 280 read_lock(&devs_lock); 281 brvcc = pick_outgoing_vcc(skb, brdev); 282 if (brvcc == NULL) { 283 pr_debug("no vcc attached to dev %s\n", dev->name); 284 dev->stats.tx_errors++; 285 dev->stats.tx_carrier_errors++; 286 /* netif_stop_queue(dev); */ 287 dev_kfree_skb(skb); 288 read_unlock(&devs_lock); 289 return NETDEV_TX_OK; 290 } 291 if (!br2684_xmit_vcc(skb, dev, brvcc)) { 292 /* 293 * We should probably use netif_*_queue() here, but that 294 * involves added complication. We need to walk before 295 * we can run. 296 * 297 * Don't free here! this pointer might be no longer valid! 298 */ 299 dev->stats.tx_errors++; 300 dev->stats.tx_fifo_errors++; 301 } 302 read_unlock(&devs_lock); 303 return NETDEV_TX_OK; 304} 305 306/* 307 * We remember when the MAC gets set, so we don't override it later with 308 * the ESI of the ATM card of the first VC 309 */ 310static int br2684_mac_addr(struct net_device *dev, void *p) 311{ 312 int err = eth_mac_addr(dev, p); 313 if (!err) 314 BRPRIV(dev)->mac_was_set = 1; 315 return err; 316} 317 318#ifdef CONFIG_ATM_BR2684_IPFILTER 319/* this IOCTL is experimental. */ 320static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) 321{ 322 struct br2684_vcc *brvcc; 323 struct br2684_filter_set fs; 324 325 if (copy_from_user(&fs, arg, sizeof fs)) 326 return -EFAULT; 327 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { 328 /* 329 * This is really a per-vcc thing, but we can also search 330 * by device. 331 */ 332 struct br2684_dev *brdev; 333 read_lock(&devs_lock); 334 brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); 335 if (brdev == NULL || list_empty(&brdev->brvccs) || 336 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ 337 brvcc = NULL; 338 else 339 brvcc = list_entry_brvcc(brdev->brvccs.next); 340 read_unlock(&devs_lock); 341 if (brvcc == NULL) 342 return -ESRCH; 343 } else 344 brvcc = BR2684_VCC(atmvcc); 345 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); 346 return 0; 347} 348 349/* Returns 1 if packet should be dropped */ 350static inline int 351packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) 352{ 353 if (brvcc->filter.netmask == 0) 354 return 0; /* no filter in place */ 355 if (type == htons(ETH_P_IP) && 356 (((struct iphdr *)(skb->data))->daddr & brvcc->filter. 357 netmask) == brvcc->filter.prefix) 358 return 0; 359 if (type == htons(ETH_P_ARP)) 360 return 0; 361 /* 362 * TODO: we should probably filter ARPs too.. don't want to have 363 * them returning values that don't make sense, or is that ok? 364 */ 365 return 1; /* drop */ 366} 367#endif /* CONFIG_ATM_BR2684_IPFILTER */ 368 369static void br2684_close_vcc(struct br2684_vcc *brvcc) 370{ 371 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); 372 write_lock_irq(&devs_lock); 373 list_del(&brvcc->brvccs); 374 write_unlock_irq(&devs_lock); 375 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ 376 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ 377 kfree(brvcc); 378 module_put(THIS_MODULE); 379} 380 381/* when AAL5 PDU comes in: */ 382static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 383{ 384 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 385 struct net_device *net_dev = brvcc->device; 386 struct br2684_dev *brdev = BRPRIV(net_dev); 387 388 pr_debug("\n"); 389 390 if (unlikely(skb == NULL)) { 391 /* skb==NULL means VCC is being destroyed */ 392 br2684_close_vcc(brvcc); 393 if (list_empty(&brdev->brvccs)) { 394 write_lock_irq(&devs_lock); 395 list_del(&brdev->br2684_devs); 396 write_unlock_irq(&devs_lock); 397 unregister_netdev(net_dev); 398 free_netdev(net_dev); 399 } 400 return; 401 } 402 403 skb_debug(skb); 404 atm_return(atmvcc, skb->truesize); 405 pr_debug("skb from brdev %p\n", brdev); 406 if (brvcc->encaps == e_llc) { 407 408 if (skb->len > 7 && skb->data[7] == 0x01) 409 __skb_trim(skb, skb->len - 4); 410 411 /* accept packets that have "ipv[46]" in the snap header */ 412 if ((skb->len >= (sizeof(llc_oui_ipv4))) && 413 (memcmp(skb->data, llc_oui_ipv4, 414 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { 415 if (memcmp(skb->data + 6, ethertype_ipv6, 416 sizeof(ethertype_ipv6)) == 0) 417 skb->protocol = htons(ETH_P_IPV6); 418 else if (memcmp(skb->data + 6, ethertype_ipv4, 419 sizeof(ethertype_ipv4)) == 0) 420 skb->protocol = htons(ETH_P_IP); 421 else 422 goto error; 423 skb_pull(skb, sizeof(llc_oui_ipv4)); 424 skb_reset_network_header(skb); 425 skb->pkt_type = PACKET_HOST; 426 /* 427 * Let us waste some time for checking the encapsulation. 428 * Note, that only 7 char is checked so frames with a valid FCS 429 * are also accepted (but FCS is not checked of course). 430 */ 431 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && 432 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { 433 skb_pull(skb, sizeof(llc_oui_pid_pad)); 434 skb->protocol = eth_type_trans(skb, net_dev); 435 } else 436 goto error; 437 438 } else { /* e_vc */ 439 if (brdev->payload == p_routed) { 440 struct iphdr *iph; 441 442 skb_reset_network_header(skb); 443 iph = ip_hdr(skb); 444 if (iph->version == 4) 445 skb->protocol = htons(ETH_P_IP); 446 else if (iph->version == 6) 447 skb->protocol = htons(ETH_P_IPV6); 448 else 449 goto error; 450 skb->pkt_type = PACKET_HOST; 451 } else { /* p_bridged */ 452 /* first 2 chars should be 0 */ 453 if (*((u16 *) (skb->data)) != 0) 454 goto error; 455 skb_pull(skb, BR2684_PAD_LEN); 456 skb->protocol = eth_type_trans(skb, net_dev); 457 } 458 } 459 460#ifdef CONFIG_ATM_BR2684_IPFILTER 461 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) 462 goto dropped; 463#endif /* CONFIG_ATM_BR2684_IPFILTER */ 464 skb->dev = net_dev; 465 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 466 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 467 skb_debug(skb); 468 /* sigh, interface is down? */ 469 if (unlikely(!(net_dev->flags & IFF_UP))) 470 goto dropped; 471 net_dev->stats.rx_packets++; 472 net_dev->stats.rx_bytes += skb->len; 473 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 474 netif_rx(skb); 475 return; 476 477dropped: 478 net_dev->stats.rx_dropped++; 479 goto free_skb; 480error: 481 net_dev->stats.rx_errors++; 482free_skb: 483 dev_kfree_skb(skb); 484} 485 486/* 487 * Assign a vcc to a dev 488 * Note: we do not have explicit unassign, but look at _push() 489 */ 490static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) 491{ 492 struct sk_buff_head queue; 493 int err; 494 struct br2684_vcc *brvcc; 495 struct sk_buff *skb, *tmp; 496 struct sk_buff_head *rq; 497 struct br2684_dev *brdev; 498 struct net_device *net_dev; 499 struct atm_backend_br2684 be; 500 unsigned long flags; 501 502 if (copy_from_user(&be, arg, sizeof be)) 503 return -EFAULT; 504 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 505 if (!brvcc) 506 return -ENOMEM; 507 write_lock_irq(&devs_lock); 508 net_dev = br2684_find_dev(&be.ifspec); 509 if (net_dev == NULL) { 510 pr_err("tried to attach to non-existent device\n"); 511 err = -ENXIO; 512 goto error; 513 } 514 brdev = BRPRIV(net_dev); 515 if (atmvcc->push == NULL) { 516 err = -EBADFD; 517 goto error; 518 } 519 if (!list_empty(&brdev->brvccs)) { 520 /* Only 1 VCC/dev right now */ 521 err = -EEXIST; 522 goto error; 523 } 524 if (be.fcs_in != BR2684_FCSIN_NO || 525 be.fcs_out != BR2684_FCSOUT_NO || 526 be.fcs_auto || be.has_vpiid || be.send_padding || 527 (be.encaps != BR2684_ENCAPS_VC && 528 be.encaps != BR2684_ENCAPS_LLC) || 529 be.min_size != 0) { 530 err = -EINVAL; 531 goto error; 532 } 533 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); 534 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 535 unsigned char *esi = atmvcc->dev->esi; 536 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 537 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 538 else 539 net_dev->dev_addr[2] = 1; 540 } 541 list_add(&brvcc->brvccs, &brdev->brvccs); 542 write_unlock_irq(&devs_lock); 543 brvcc->device = net_dev; 544 brvcc->atmvcc = atmvcc; 545 atmvcc->user_back = brvcc; 546 brvcc->encaps = (enum br2684_encaps)be.encaps; 547 brvcc->old_push = atmvcc->push; 548 brvcc->old_pop = atmvcc->pop; 549 barrier(); 550 atmvcc->push = br2684_push; 551 atmvcc->pop = br2684_pop; 552 553 __skb_queue_head_init(&queue); 554 rq = &sk_atm(atmvcc)->sk_receive_queue; 555 556 spin_lock_irqsave(&rq->lock, flags); 557 skb_queue_splice_init(rq, &queue); 558 spin_unlock_irqrestore(&rq->lock, flags); 559 560 skb_queue_walk_safe(&queue, skb, tmp) { 561 struct net_device *dev; 562 563 br2684_push(atmvcc, skb); 564 dev = skb->dev; 565 566 dev->stats.rx_bytes -= skb->len; 567 dev->stats.rx_packets--; 568 } 569 570 /* initialize netdev carrier state */ 571 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) 572 netif_carrier_off(net_dev); 573 else 574 netif_carrier_on(net_dev); 575 576 __module_get(THIS_MODULE); 577 return 0; 578 579error: 580 write_unlock_irq(&devs_lock); 581 kfree(brvcc); 582 return err; 583} 584 585static const struct net_device_ops br2684_netdev_ops = { 586 .ndo_start_xmit = br2684_start_xmit, 587 .ndo_set_mac_address = br2684_mac_addr, 588 .ndo_change_mtu = eth_change_mtu, 589 .ndo_validate_addr = eth_validate_addr, 590}; 591 592static const struct net_device_ops br2684_netdev_ops_routed = { 593 .ndo_start_xmit = br2684_start_xmit, 594 .ndo_set_mac_address = br2684_mac_addr, 595 .ndo_change_mtu = eth_change_mtu 596}; 597 598static void br2684_setup(struct net_device *netdev) 599{ 600 struct br2684_dev *brdev = BRPRIV(netdev); 601 602 ether_setup(netdev); 603 brdev->net_dev = netdev; 604 605 netdev->netdev_ops = &br2684_netdev_ops; 606 607 INIT_LIST_HEAD(&brdev->brvccs); 608} 609 610static void br2684_setup_routed(struct net_device *netdev) 611{ 612 struct br2684_dev *brdev = BRPRIV(netdev); 613 614 brdev->net_dev = netdev; 615 netdev->hard_header_len = 0; 616 netdev->netdev_ops = &br2684_netdev_ops_routed; 617 netdev->addr_len = 0; 618 netdev->mtu = 1500; 619 netdev->type = ARPHRD_PPP; 620 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 621 netdev->tx_queue_len = 100; 622 INIT_LIST_HEAD(&brdev->brvccs); 623} 624 625static int br2684_create(void __user *arg) 626{ 627 int err; 628 struct net_device *netdev; 629 struct br2684_dev *brdev; 630 struct atm_newif_br2684 ni; 631 enum br2684_payload payload; 632 633 pr_debug("\n"); 634 635 if (copy_from_user(&ni, arg, sizeof ni)) 636 return -EFAULT; 637 638 if (ni.media & BR2684_FLAG_ROUTED) 639 payload = p_routed; 640 else 641 payload = p_bridged; 642 ni.media &= 0xffff; /* strip flags */ 643 644 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) 645 return -EINVAL; 646 647 netdev = alloc_netdev(sizeof(struct br2684_dev), 648 ni.ifname[0] ? ni.ifname : "nas%d", 649 (payload == p_routed) ? 650 br2684_setup_routed : br2684_setup); 651 if (!netdev) 652 return -ENOMEM; 653 654 brdev = BRPRIV(netdev); 655 656 pr_debug("registered netdev %s\n", netdev->name); 657 /* open, stop, do_ioctl ? */ 658 err = register_netdev(netdev); 659 if (err < 0) { 660 pr_err("register_netdev failed\n"); 661 free_netdev(netdev); 662 return err; 663 } 664 665 write_lock_irq(&devs_lock); 666 667 brdev->payload = payload; 668 669 if (list_empty(&br2684_devs)) { 670 /* 1st br2684 device */ 671 brdev->number = 1; 672 } else 673 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; 674 675 list_add_tail(&brdev->br2684_devs, &br2684_devs); 676 write_unlock_irq(&devs_lock); 677 return 0; 678} 679 680/* 681 * This handles ioctls actually performed on our vcc - we must return 682 * -ENOIOCTLCMD for any unrecognized ioctl 683 */ 684static int br2684_ioctl(struct socket *sock, unsigned int cmd, 685 unsigned long arg) 686{ 687 struct atm_vcc *atmvcc = ATM_SD(sock); 688 void __user *argp = (void __user *)arg; 689 atm_backend_t b; 690 691 int err; 692 switch (cmd) { 693 case ATM_SETBACKEND: 694 case ATM_NEWBACKENDIF: 695 err = get_user(b, (atm_backend_t __user *) argp); 696 if (err) 697 return -EFAULT; 698 if (b != ATM_BACKEND_BR2684) 699 return -ENOIOCTLCMD; 700 if (!capable(CAP_NET_ADMIN)) 701 return -EPERM; 702 if (cmd == ATM_SETBACKEND) 703 return br2684_regvcc(atmvcc, argp); 704 else 705 return br2684_create(argp); 706#ifdef CONFIG_ATM_BR2684_IPFILTER 707 case BR2684_SETFILT: 708 if (atmvcc->push != br2684_push) 709 return -ENOIOCTLCMD; 710 if (!capable(CAP_NET_ADMIN)) 711 return -EPERM; 712 err = br2684_setfilt(atmvcc, argp); 713 714 return err; 715#endif /* CONFIG_ATM_BR2684_IPFILTER */ 716 } 717 return -ENOIOCTLCMD; 718} 719 720static struct atm_ioctl br2684_ioctl_ops = { 721 .owner = THIS_MODULE, 722 .ioctl = br2684_ioctl, 723}; 724 725#ifdef CONFIG_PROC_FS 726static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) 727 __acquires(devs_lock) 728{ 729 read_lock(&devs_lock); 730 return seq_list_start(&br2684_devs, *pos); 731} 732 733static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) 734{ 735 return seq_list_next(v, &br2684_devs, pos); 736} 737 738static void br2684_seq_stop(struct seq_file *seq, void *v) 739 __releases(devs_lock) 740{ 741 read_unlock(&devs_lock); 742} 743 744static int br2684_seq_show(struct seq_file *seq, void *v) 745{ 746 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, 747 br2684_devs); 748 const struct net_device *net_dev = brdev->net_dev; 749 const struct br2684_vcc *brvcc; 750 751 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", 752 net_dev->name, 753 brdev->number, 754 net_dev->dev_addr, 755 brdev->mac_was_set ? "set" : "auto"); 756 757 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { 758 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" 759 ", failed copies %u/%u" 760 "\n", brvcc->atmvcc->dev->number, 761 brvcc->atmvcc->vpi, brvcc->atmvcc->vci, 762 (brvcc->encaps == e_llc) ? "LLC" : "VC", 763 (brdev->payload == p_bridged) ? "bridged" : "routed", 764 brvcc->copies_failed, brvcc->copies_needed); 765#ifdef CONFIG_ATM_BR2684_IPFILTER 766#define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] 767#define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) 768 if (brvcc->filter.netmask != 0) 769 seq_printf(seq, " filter=%d.%d.%d.%d/" 770 "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); 771#undef bs 772#undef b1 773#endif /* CONFIG_ATM_BR2684_IPFILTER */ 774 } 775 return 0; 776} 777 778static const struct seq_operations br2684_seq_ops = { 779 .start = br2684_seq_start, 780 .next = br2684_seq_next, 781 .stop = br2684_seq_stop, 782 .show = br2684_seq_show, 783}; 784 785static int br2684_proc_open(struct inode *inode, struct file *file) 786{ 787 return seq_open(file, &br2684_seq_ops); 788} 789 790static const struct file_operations br2684_proc_ops = { 791 .owner = THIS_MODULE, 792 .open = br2684_proc_open, 793 .read = seq_read, 794 .llseek = seq_lseek, 795 .release = seq_release, 796}; 797 798extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 799#endif /* CONFIG_PROC_FS */ 800 801static int __init br2684_init(void) 802{ 803#ifdef CONFIG_PROC_FS 804 struct proc_dir_entry *p; 805 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); 806 if (p == NULL) 807 return -ENOMEM; 808#endif 809 register_atm_ioctl(&br2684_ioctl_ops); 810 register_atmdevice_notifier(&atm_dev_notifier); 811 return 0; 812} 813 814static void __exit br2684_exit(void) 815{ 816 struct net_device *net_dev; 817 struct br2684_dev *brdev; 818 struct br2684_vcc *brvcc; 819 deregister_atm_ioctl(&br2684_ioctl_ops); 820 821#ifdef CONFIG_PROC_FS 822 remove_proc_entry("br2684", atm_proc_root); 823#endif 824 825 826 unregister_atmdevice_notifier(&atm_dev_notifier); 827 828 while (!list_empty(&br2684_devs)) { 829 net_dev = list_entry_brdev(br2684_devs.next); 830 brdev = BRPRIV(net_dev); 831 while (!list_empty(&brdev->brvccs)) { 832 brvcc = list_entry_brvcc(brdev->brvccs.next); 833 br2684_close_vcc(brvcc); 834 } 835 836 list_del(&brdev->br2684_devs); 837 unregister_netdev(net_dev); 838 free_netdev(net_dev); 839 } 840} 841 842module_init(br2684_init); 843module_exit(br2684_exit); 844 845MODULE_AUTHOR("Marcell GAL"); 846MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 847MODULE_LICENSE("GPL"); 848