br2684.c revision 524ad0a79126efabf58d0a49eace6155ab5b4549
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#include <linux/module.h> 10#include <linux/init.h> 11#include <linux/kernel.h> 12#include <linux/list.h> 13#include <linux/netdevice.h> 14#include <linux/skbuff.h> 15#include <linux/etherdevice.h> 16#include <linux/rtnetlink.h> 17#include <linux/ip.h> 18#include <asm/uaccess.h> 19#include <net/arp.h> 20#include <linux/atm.h> 21#include <linux/atmdev.h> 22#include <linux/capability.h> 23#include <linux/seq_file.h> 24 25#include <linux/atmbr2684.h> 26 27#include "common.h" 28 29#ifdef SKB_DEBUG 30static void skb_debug(const struct sk_buff *skb) 31{ 32#define NUM2PRINT 50 33 char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ 34 int i = 0; 35 for (i = 0; i < skb->len && i < NUM2PRINT; i++) { 36 sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); 37 } 38 printk(KERN_DEBUG "br2684: skb: %s\n", buf); 39} 40#else 41#define skb_debug(skb) do {} while (0) 42#endif 43 44#define BR2684_ETHERTYPE_LEN 2 45#define BR2684_PAD_LEN 2 46 47#define LLC 0xaa, 0xaa, 0x03 48#define SNAP_BRIDGED 0x00, 0x80, 0xc2 49#define SNAP_ROUTED 0x00, 0x00, 0x00 50#define PID_ETHERNET 0x00, 0x07 51#define ETHERTYPE_IPV4 0x08, 0x00 52#define ETHERTYPE_IPV6 0x86, 0xdd 53#define PAD_BRIDGED 0x00, 0x00 54 55static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; 56static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; 57static const unsigned char llc_oui_pid_pad[] = 58 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; 59static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; 60static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; 61 62enum br2684_encaps { 63 e_vc = BR2684_ENCAPS_VC, 64 e_llc = BR2684_ENCAPS_LLC, 65}; 66 67struct br2684_vcc { 68 struct atm_vcc *atmvcc; 69 struct net_device *device; 70 /* keep old push, pop functions for chaining */ 71 void (*old_push) (struct atm_vcc * vcc, struct sk_buff * skb); 72 /* void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); */ 73 enum br2684_encaps encaps; 74 struct list_head brvccs; 75#ifdef CONFIG_ATM_BR2684_IPFILTER 76 struct br2684_filter filter; 77#endif /* CONFIG_ATM_BR2684_IPFILTER */ 78 unsigned copies_needed, copies_failed; 79}; 80 81struct br2684_dev { 82 struct net_device *net_dev; 83 struct list_head br2684_devs; 84 int number; 85 struct list_head brvccs; /* one device <=> one vcc (before xmas) */ 86 struct net_device_stats stats; 87 int mac_was_set; 88 enum br2684_payload payload; 89}; 90 91/* 92 * This lock should be held for writing any time the list of devices or 93 * their attached vcc's could be altered. It should be held for reading 94 * any time these are being queried. Note that we sometimes need to 95 * do read-locking under interrupt context, so write locking must block 96 * the current CPU's interrupts 97 */ 98static DEFINE_RWLOCK(devs_lock); 99 100static LIST_HEAD(br2684_devs); 101 102static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) 103{ 104 return (struct br2684_dev *)netdev_priv(net_dev); 105} 106 107static inline struct net_device *list_entry_brdev(const struct list_head *le) 108{ 109 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; 110} 111 112static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) 113{ 114 return (struct br2684_vcc *)(atmvcc->user_back); 115} 116 117static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) 118{ 119 return list_entry(le, struct br2684_vcc, brvccs); 120} 121 122/* Caller should hold read_lock(&devs_lock) */ 123static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) 124{ 125 struct list_head *lh; 126 struct net_device *net_dev; 127 switch (s->method) { 128 case BR2684_FIND_BYNUM: 129 list_for_each(lh, &br2684_devs) { 130 net_dev = list_entry_brdev(lh); 131 if (BRPRIV(net_dev)->number == s->spec.devnum) 132 return net_dev; 133 } 134 break; 135 case BR2684_FIND_BYIFNAME: 136 list_for_each(lh, &br2684_devs) { 137 net_dev = list_entry_brdev(lh); 138 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) 139 return net_dev; 140 } 141 break; 142 } 143 return NULL; 144} 145 146/* 147 * Send a packet out a particular vcc. Not to useful right now, but paves 148 * the way for multiple vcc's per itf. Returns true if we can send, 149 * otherwise false 150 */ 151static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, 152 struct br2684_vcc *brvcc) 153{ 154 struct atm_vcc *atmvcc; 155 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; 156 157 if (skb_headroom(skb) < minheadroom) { 158 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); 159 brvcc->copies_needed++; 160 dev_kfree_skb(skb); 161 if (skb2 == NULL) { 162 brvcc->copies_failed++; 163 return 0; 164 } 165 skb = skb2; 166 } 167 168 if (brvcc->encaps == e_llc) { 169 if (brdev->payload == p_bridged) { 170 skb_push(skb, sizeof(llc_oui_pid_pad)); 171 skb_copy_to_linear_data(skb, llc_oui_pid_pad, 172 sizeof(llc_oui_pid_pad)); 173 } else if (brdev->payload == p_routed) { 174 unsigned short prot = ntohs(skb->protocol); 175 176 skb_push(skb, sizeof(llc_oui_ipv4)); 177 switch (prot) { 178 case ETH_P_IP: 179 skb_copy_to_linear_data(skb, llc_oui_ipv4, 180 sizeof(llc_oui_ipv4)); 181 break; 182 case ETH_P_IPV6: 183 skb_copy_to_linear_data(skb, llc_oui_ipv6, 184 sizeof(llc_oui_ipv6)); 185 break; 186 default: 187 dev_kfree_skb(skb); 188 return 0; 189 } 190 } 191 } else { /* e_vc */ 192 if (brdev->payload == p_bridged) { 193 skb_push(skb, 2); 194 memset(skb->data, 0, 2); 195 } else { /* p_routed */ 196 skb_pull(skb, ETH_HLEN); 197 } 198 } 199 skb_debug(skb); 200 201 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; 202 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); 203 if (!atm_may_send(atmvcc, skb->truesize)) { 204 /* 205 * We free this here for now, because we cannot know in a higher 206 * layer whether the skb pointer it supplied wasn't freed yet. 207 * Now, it always is. 208 */ 209 dev_kfree_skb(skb); 210 return 0; 211 } 212 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); 213 ATM_SKB(skb)->atm_options = atmvcc->atm_options; 214 brdev->stats.tx_packets++; 215 brdev->stats.tx_bytes += skb->len; 216 atmvcc->send(atmvcc, skb); 217 return 1; 218} 219 220static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, 221 const struct br2684_dev *brdev) 222{ 223 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ 224} 225 226static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) 227{ 228 struct br2684_dev *brdev = BRPRIV(dev); 229 struct br2684_vcc *brvcc; 230 231 pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst); 232 read_lock(&devs_lock); 233 brvcc = pick_outgoing_vcc(skb, brdev); 234 if (brvcc == NULL) { 235 pr_debug("no vcc attached to dev %s\n", dev->name); 236 brdev->stats.tx_errors++; 237 brdev->stats.tx_carrier_errors++; 238 /* netif_stop_queue(dev); */ 239 dev_kfree_skb(skb); 240 read_unlock(&devs_lock); 241 return 0; 242 } 243 if (!br2684_xmit_vcc(skb, brdev, brvcc)) { 244 /* 245 * We should probably use netif_*_queue() here, but that 246 * involves added complication. We need to walk before 247 * we can run. 248 * 249 * Don't free here! this pointer might be no longer valid! 250 */ 251 brdev->stats.tx_errors++; 252 brdev->stats.tx_fifo_errors++; 253 } 254 read_unlock(&devs_lock); 255 return 0; 256} 257 258static struct net_device_stats *br2684_get_stats(struct net_device *dev) 259{ 260 pr_debug("br2684_get_stats\n"); 261 return &BRPRIV(dev)->stats; 262} 263 264/* 265 * We remember when the MAC gets set, so we don't override it later with 266 * the ESI of the ATM card of the first VC 267 */ 268static int (*my_eth_mac_addr) (struct net_device *, void *); 269static int br2684_mac_addr(struct net_device *dev, void *p) 270{ 271 int err = my_eth_mac_addr(dev, p); 272 if (!err) 273 BRPRIV(dev)->mac_was_set = 1; 274 return err; 275} 276 277#ifdef CONFIG_ATM_BR2684_IPFILTER 278/* this IOCTL is experimental. */ 279static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) 280{ 281 struct br2684_vcc *brvcc; 282 struct br2684_filter_set fs; 283 284 if (copy_from_user(&fs, arg, sizeof fs)) 285 return -EFAULT; 286 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { 287 /* 288 * This is really a per-vcc thing, but we can also search 289 * by device. 290 */ 291 struct br2684_dev *brdev; 292 read_lock(&devs_lock); 293 brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); 294 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ 295 brvcc = NULL; 296 else 297 brvcc = list_entry_brvcc(brdev->brvccs.next); 298 read_unlock(&devs_lock); 299 if (brvcc == NULL) 300 return -ESRCH; 301 } else 302 brvcc = BR2684_VCC(atmvcc); 303 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); 304 return 0; 305} 306 307/* Returns 1 if packet should be dropped */ 308static inline int 309packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) 310{ 311 if (brvcc->filter.netmask == 0) 312 return 0; /* no filter in place */ 313 if (type == htons(ETH_P_IP) && 314 (((struct iphdr *)(skb->data))->daddr & brvcc->filter. 315 netmask) == brvcc->filter.prefix) 316 return 0; 317 if (type == htons(ETH_P_ARP)) 318 return 0; 319 /* 320 * TODO: we should probably filter ARPs too.. don't want to have 321 * them returning values that don't make sense, or is that ok? 322 */ 323 return 1; /* drop */ 324} 325#endif /* CONFIG_ATM_BR2684_IPFILTER */ 326 327static void br2684_close_vcc(struct br2684_vcc *brvcc) 328{ 329 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); 330 write_lock_irq(&devs_lock); 331 list_del(&brvcc->brvccs); 332 write_unlock_irq(&devs_lock); 333 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ 334 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ 335 kfree(brvcc); 336 module_put(THIS_MODULE); 337} 338 339/* when AAL5 PDU comes in: */ 340static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 341{ 342 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 343 struct net_device *net_dev = brvcc->device; 344 struct br2684_dev *brdev = BRPRIV(net_dev); 345 346 pr_debug("br2684_push\n"); 347 348 if (unlikely(skb == NULL)) { 349 /* skb==NULL means VCC is being destroyed */ 350 br2684_close_vcc(brvcc); 351 if (list_empty(&brdev->brvccs)) { 352 write_lock_irq(&devs_lock); 353 list_del(&brdev->br2684_devs); 354 write_unlock_irq(&devs_lock); 355 unregister_netdev(net_dev); 356 free_netdev(net_dev); 357 } 358 return; 359 } 360 361 skb_debug(skb); 362 atm_return(atmvcc, skb->truesize); 363 pr_debug("skb from brdev %p\n", brdev); 364 if (brvcc->encaps == e_llc) { 365 366 if (skb->len > 7 && skb->data[7] == 0x01) 367 __skb_trim(skb, skb->len - 4); 368 369 /* accept packets that have "ipv[46]" in the snap header */ 370 if ((skb->len >= (sizeof(llc_oui_ipv4))) 371 && 372 (memcmp 373 (skb->data, llc_oui_ipv4, 374 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { 375 if (memcmp 376 (skb->data + 6, ethertype_ipv6, 377 sizeof(ethertype_ipv6)) == 0) 378 skb->protocol = htons(ETH_P_IPV6); 379 else if (memcmp 380 (skb->data + 6, ethertype_ipv4, 381 sizeof(ethertype_ipv4)) == 0) 382 skb->protocol = htons(ETH_P_IP); 383 else 384 goto error; 385 skb_pull(skb, sizeof(llc_oui_ipv4)); 386 skb_reset_network_header(skb); 387 skb->pkt_type = PACKET_HOST; 388 /* 389 * Let us waste some time for checking the encapsulation. 390 * Note, that only 7 char is checked so frames with a valid FCS 391 * are also accepted (but FCS is not checked of course). 392 */ 393 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && 394 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { 395 skb_pull(skb, sizeof(llc_oui_pid_pad)); 396 skb->protocol = eth_type_trans(skb, net_dev); 397 } else 398 goto error; 399 400 } else { /* e_vc */ 401 if (brdev->payload == p_routed) { 402 struct iphdr *iph; 403 404 skb_reset_network_header(skb); 405 iph = ip_hdr(skb); 406 if (iph->version == 4) 407 skb->protocol = htons(ETH_P_IP); 408 else if (iph->version == 6) 409 skb->protocol = htons(ETH_P_IPV6); 410 else 411 goto error; 412 skb->pkt_type = PACKET_HOST; 413 } else { /* p_bridged */ 414 /* first 2 chars should be 0 */ 415 if (*((u16 *) (skb->data)) != 0) 416 goto error; 417 skb_pull(skb, BR2684_PAD_LEN); 418 skb->protocol = eth_type_trans(skb, net_dev); 419 } 420 } 421 422#ifdef CONFIG_ATM_BR2684_IPFILTER 423 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) 424 goto dropped; 425#endif /* CONFIG_ATM_BR2684_IPFILTER */ 426 skb->dev = net_dev; 427 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 428 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 429 skb_debug(skb); 430 /* sigh, interface is down? */ 431 if (unlikely(!(net_dev->flags & IFF_UP))) 432 goto dropped; 433 brdev->stats.rx_packets++; 434 brdev->stats.rx_bytes += skb->len; 435 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 436 netif_rx(skb); 437 return; 438 439dropped: 440 brdev->stats.rx_dropped++; 441 goto free_skb; 442error: 443 brdev->stats.rx_errors++; 444free_skb: 445 dev_kfree_skb(skb); 446 return; 447} 448 449/* 450 * Assign a vcc to a dev 451 * Note: we do not have explicit unassign, but look at _push() 452 */ 453static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) 454{ 455 int err; 456 struct br2684_vcc *brvcc; 457 struct sk_buff *skb; 458 struct sk_buff_head *rq; 459 struct br2684_dev *brdev; 460 struct net_device *net_dev; 461 struct atm_backend_br2684 be; 462 unsigned long flags; 463 464 if (copy_from_user(&be, arg, sizeof be)) 465 return -EFAULT; 466 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 467 if (!brvcc) 468 return -ENOMEM; 469 write_lock_irq(&devs_lock); 470 net_dev = br2684_find_dev(&be.ifspec); 471 if (net_dev == NULL) { 472 printk(KERN_ERR 473 "br2684: tried to attach to non-existant device\n"); 474 err = -ENXIO; 475 goto error; 476 } 477 brdev = BRPRIV(net_dev); 478 if (atmvcc->push == NULL) { 479 err = -EBADFD; 480 goto error; 481 } 482 if (!list_empty(&brdev->brvccs)) { 483 /* Only 1 VCC/dev right now */ 484 err = -EEXIST; 485 goto error; 486 } 487 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || 488 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != 489 BR2684_ENCAPS_VC 490 && be.encaps != 491 BR2684_ENCAPS_LLC) 492 || be.min_size != 0) { 493 err = -EINVAL; 494 goto error; 495 } 496 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, 497 be.encaps, brvcc); 498 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 499 unsigned char *esi = atmvcc->dev->esi; 500 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 501 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 502 else 503 net_dev->dev_addr[2] = 1; 504 } 505 list_add(&brvcc->brvccs, &brdev->brvccs); 506 write_unlock_irq(&devs_lock); 507 brvcc->device = net_dev; 508 brvcc->atmvcc = atmvcc; 509 atmvcc->user_back = brvcc; 510 brvcc->encaps = (enum br2684_encaps)be.encaps; 511 brvcc->old_push = atmvcc->push; 512 barrier(); 513 atmvcc->push = br2684_push; 514 515 rq = &sk_atm(atmvcc)->sk_receive_queue; 516 517 spin_lock_irqsave(&rq->lock, flags); 518 if (skb_queue_empty(rq)) { 519 skb = NULL; 520 } else { 521 /* NULL terminate the list. */ 522 rq->prev->next = NULL; 523 skb = rq->next; 524 } 525 rq->prev = rq->next = (struct sk_buff *)rq; 526 rq->qlen = 0; 527 spin_unlock_irqrestore(&rq->lock, flags); 528 529 while (skb) { 530 struct sk_buff *next = skb->next; 531 532 skb->next = skb->prev = NULL; 533 br2684_push(atmvcc, skb); 534 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; 535 BRPRIV(skb->dev)->stats.rx_packets--; 536 537 skb = next; 538 } 539 __module_get(THIS_MODULE); 540 return 0; 541 error: 542 write_unlock_irq(&devs_lock); 543 kfree(brvcc); 544 return err; 545} 546 547static void br2684_setup(struct net_device *netdev) 548{ 549 struct br2684_dev *brdev = BRPRIV(netdev); 550 551 ether_setup(netdev); 552 brdev->net_dev = netdev; 553 554 my_eth_mac_addr = netdev->set_mac_address; 555 netdev->set_mac_address = br2684_mac_addr; 556 netdev->hard_start_xmit = br2684_start_xmit; 557 netdev->get_stats = br2684_get_stats; 558 559 INIT_LIST_HEAD(&brdev->brvccs); 560} 561 562static void br2684_setup_routed(struct net_device *netdev) 563{ 564 struct br2684_dev *brdev = BRPRIV(netdev); 565 brdev->net_dev = netdev; 566 567 netdev->hard_header_len = 0; 568 my_eth_mac_addr = netdev->set_mac_address; 569 netdev->set_mac_address = br2684_mac_addr; 570 netdev->hard_start_xmit = br2684_start_xmit; 571 netdev->get_stats = br2684_get_stats; 572 netdev->addr_len = 0; 573 netdev->mtu = 1500; 574 netdev->type = ARPHRD_PPP; 575 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 576 netdev->tx_queue_len = 100; 577 INIT_LIST_HEAD(&brdev->brvccs); 578} 579 580static int br2684_create(void __user * arg) 581{ 582 int err; 583 struct net_device *netdev; 584 struct br2684_dev *brdev; 585 struct atm_newif_br2684 ni; 586 enum br2684_payload payload; 587 588 pr_debug("br2684_create\n"); 589 590 if (copy_from_user(&ni, arg, sizeof ni)) { 591 return -EFAULT; 592 } 593 594 if (ni.media & BR2684_FLAG_ROUTED) 595 payload = p_routed; 596 else 597 payload = p_bridged; 598 ni.media &= 0xffff; /* strip flags */ 599 600 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { 601 return -EINVAL; 602 } 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 printk(KERN_ERR "br2684_create: 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 */ 635static 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 671static struct atm_ioctl br2684_ioctl_ops = { 672 .owner = THIS_MODULE, 673 .ioctl = br2684_ioctl, 674}; 675 676#ifdef CONFIG_PROC_FS 677static 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 684static 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 689static void br2684_seq_stop(struct seq_file *seq, void *v) 690 __releases(devs_lock) 691{ 692 read_unlock(&devs_lock); 693} 694 695static 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 729static 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 736static int br2684_proc_open(struct inode *inode, struct file *file) 737{ 738 return seq_open(file, &br2684_seq_ops); 739} 740 741static 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 749extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 750#endif /* CONFIG_PROC_FS */ 751 752static 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 764static 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 789module_init(br2684_init); 790module_exit(br2684_exit); 791 792MODULE_AUTHOR("Marcell GAL"); 793MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 794MODULE_LICENSE("GPL"); 795