1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Ethernet netdevice using ATM AAL5 as underlying carrier 4 * (RFC1483 obsoleted by RFC2684) for Linux 5 * 6 * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary 7 * Eric Kinzie, 2006-2007, US Naval Research Laboratory 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/list.h> 16 #include <linux/netdevice.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/rtnetlink.h> 20 #include <linux/ip.h> 21 #include <linux/uaccess.h> 22 #include <linux/slab.h> 23 #include <net/arp.h> 24 #include <linux/atm.h> 25 #include <linux/atmdev.h> 26 #include <linux/capability.h> 27 #include <linux/seq_file.h> 28 29 #include <linux/atmbr2684.h> 30 31 #include "common.h" 32 33 static void skb_debug(const struct sk_buff *skb) 34 { 35 #ifdef SKB_DEBUG 36 #define NUM2PRINT 50 37 print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, 38 16, 1, skb->data, min(NUM2PRINT, skb->len), true); 39 #endif 40 } 41 42 #define BR2684_ETHERTYPE_LEN 2 43 #define BR2684_PAD_LEN 2 44 45 #define LLC 0xaa, 0xaa, 0x03 46 #define SNAP_BRIDGED 0x00, 0x80, 0xc2 47 #define SNAP_ROUTED 0x00, 0x00, 0x00 48 #define PID_ETHERNET 0x00, 0x07 49 #define ETHERTYPE_IPV4 0x08, 0x00 50 #define ETHERTYPE_IPV6 0x86, 0xdd 51 #define PAD_BRIDGED 0x00, 0x00 52 53 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; 54 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; 55 static const unsigned char llc_oui_pid_pad[] = 56 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; 57 static const unsigned char pad[] = { PAD_BRIDGED }; 58 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; 59 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; 60 61 enum br2684_encaps { 62 e_vc = BR2684_ENCAPS_VC, 63 e_llc = BR2684_ENCAPS_LLC, 64 }; 65 66 struct br2684_vcc { 67 struct atm_vcc *atmvcc; 68 struct net_device *device; 69 /* keep old push, pop functions for chaining */ 70 void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); 71 void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); 72 void (*old_release_cb)(struct atm_vcc *vcc); 73 struct module *old_owner; 74 enum br2684_encaps encaps; 75 struct list_head brvccs; 76 #ifdef CONFIG_ATM_BR2684_IPFILTER 77 struct br2684_filter filter; 78 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 79 unsigned int copies_needed, copies_failed; 80 atomic_t qspace; 81 }; 82 83 struct br2684_dev { 84 struct net_device *net_dev; 85 struct list_head br2684_devs; 86 int number; 87 struct list_head brvccs; /* one device <=> one vcc (before xmas) */ 88 int mac_was_set; 89 enum br2684_payload payload; 90 }; 91 92 /* 93 * This lock should be held for writing any time the list of devices or 94 * their attached vcc's could be altered. It should be held for reading 95 * any time these are being queried. Note that we sometimes need to 96 * do read-locking under interrupting context, so write locking must block 97 * the current CPU's interrupts. 98 */ 99 static DEFINE_RWLOCK(devs_lock); 100 101 static LIST_HEAD(br2684_devs); 102 103 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) 104 { 105 return netdev_priv(net_dev); 106 } 107 108 static inline struct net_device *list_entry_brdev(const struct list_head *le) 109 { 110 return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; 111 } 112 113 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) 114 { 115 return (struct br2684_vcc *)(atmvcc->user_back); 116 } 117 118 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) 119 { 120 return list_entry(le, struct br2684_vcc, brvccs); 121 } 122 123 /* Caller should hold read_lock(&devs_lock) */ 124 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) 125 { 126 struct list_head *lh; 127 struct net_device *net_dev; 128 switch (s->method) { 129 case BR2684_FIND_BYNUM: 130 list_for_each(lh, &br2684_devs) { 131 net_dev = list_entry_brdev(lh); 132 if (BRPRIV(net_dev)->number == s->spec.devnum) 133 return net_dev; 134 } 135 break; 136 case BR2684_FIND_BYIFNAME: 137 list_for_each(lh, &br2684_devs) { 138 net_dev = list_entry_brdev(lh); 139 if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) 140 return net_dev; 141 } 142 break; 143 } 144 return NULL; 145 } 146 147 static int atm_dev_event(struct notifier_block *this, unsigned long event, 148 void *arg) 149 { 150 struct atm_dev *atm_dev = arg; 151 struct list_head *lh; 152 struct net_device *net_dev; 153 struct br2684_vcc *brvcc; 154 struct atm_vcc *atm_vcc; 155 unsigned long flags; 156 157 pr_debug("event=%ld dev=%p\n", event, atm_dev); 158 159 read_lock_irqsave(&devs_lock, flags); 160 list_for_each(lh, &br2684_devs) { 161 net_dev = list_entry_brdev(lh); 162 163 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { 164 atm_vcc = brvcc->atmvcc; 165 if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { 166 167 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) 168 netif_carrier_off(net_dev); 169 else 170 netif_carrier_on(net_dev); 171 172 } 173 } 174 } 175 read_unlock_irqrestore(&devs_lock, flags); 176 177 return NOTIFY_DONE; 178 } 179 180 static struct notifier_block atm_dev_notifier = { 181 .notifier_call = atm_dev_event, 182 }; 183 184 /* chained vcc->pop function. Check if we should wake the netif_queue */ 185 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) 186 { 187 struct br2684_vcc *brvcc = BR2684_VCC(vcc); 188 189 pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device); 190 brvcc->old_pop(vcc, skb); 191 192 /* If the queue space just went up from zero, wake */ 193 if (atomic_inc_return(&brvcc->qspace) == 1) 194 netif_wake_queue(brvcc->device); 195 } 196 197 /* 198 * Send a packet out a particular vcc. Not to useful right now, but paves 199 * the way for multiple vcc's per itf. Returns true if we can send, 200 * otherwise false 201 */ 202 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, 203 struct br2684_vcc *brvcc) 204 { 205 struct br2684_dev *brdev = BRPRIV(dev); 206 struct atm_vcc *atmvcc; 207 int minheadroom = (brvcc->encaps == e_llc) ? 208 ((brdev->payload == p_bridged) ? 209 sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : 210 ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); 211 212 if (skb_headroom(skb) < minheadroom) { 213 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); 214 brvcc->copies_needed++; 215 dev_kfree_skb(skb); 216 if (skb2 == NULL) { 217 brvcc->copies_failed++; 218 return 0; 219 } 220 skb = skb2; 221 } 222 223 if (brvcc->encaps == e_llc) { 224 if (brdev->payload == p_bridged) { 225 skb_push(skb, sizeof(llc_oui_pid_pad)); 226 skb_copy_to_linear_data(skb, llc_oui_pid_pad, 227 sizeof(llc_oui_pid_pad)); 228 } else if (brdev->payload == p_routed) { 229 unsigned short prot = ntohs(skb->protocol); 230 231 skb_push(skb, sizeof(llc_oui_ipv4)); 232 switch (prot) { 233 case ETH_P_IP: 234 skb_copy_to_linear_data(skb, llc_oui_ipv4, 235 sizeof(llc_oui_ipv4)); 236 break; 237 case ETH_P_IPV6: 238 skb_copy_to_linear_data(skb, llc_oui_ipv6, 239 sizeof(llc_oui_ipv6)); 240 break; 241 default: 242 dev_kfree_skb(skb); 243 return 0; 244 } 245 } 246 } else { /* e_vc */ 247 if (brdev->payload == p_bridged) { 248 skb_push(skb, 2); 249 memset(skb->data, 0, 2); 250 } 251 } 252 skb_debug(skb); 253 254 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; 255 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); 256 atm_account_tx(atmvcc, skb); 257 dev->stats.tx_packets++; 258 dev->stats.tx_bytes += skb->len; 259 260 if (atomic_dec_return(&brvcc->qspace) < 1) { 261 /* No more please! */ 262 netif_stop_queue(brvcc->device); 263 /* We might have raced with br2684_pop() */ 264 if (unlikely(atomic_read(&brvcc->qspace) > 0)) 265 netif_wake_queue(brvcc->device); 266 } 267 268 /* If this fails immediately, the skb will be freed and br2684_pop() 269 will wake the queue if appropriate. Just return an error so that 270 the stats are updated correctly */ 271 return !atmvcc->send(atmvcc, skb); 272 } 273 274 static void br2684_release_cb(struct atm_vcc *atmvcc) 275 { 276 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 277 278 if (atomic_read(&brvcc->qspace) > 0) 279 netif_wake_queue(brvcc->device); 280 281 if (brvcc->old_release_cb) 282 brvcc->old_release_cb(atmvcc); 283 } 284 285 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, 286 const struct br2684_dev *brdev) 287 { 288 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ 289 } 290 291 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, 292 struct net_device *dev) 293 { 294 struct br2684_dev *brdev = BRPRIV(dev); 295 struct br2684_vcc *brvcc; 296 struct atm_vcc *atmvcc; 297 netdev_tx_t ret = NETDEV_TX_OK; 298 299 pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); 300 read_lock(&devs_lock); 301 brvcc = pick_outgoing_vcc(skb, brdev); 302 if (brvcc == NULL) { 303 pr_debug("no vcc attached to dev %s\n", dev->name); 304 dev->stats.tx_errors++; 305 dev->stats.tx_carrier_errors++; 306 /* netif_stop_queue(dev); */ 307 dev_kfree_skb(skb); 308 goto out_devs; 309 } 310 atmvcc = brvcc->atmvcc; 311 312 bh_lock_sock(sk_atm(atmvcc)); 313 314 if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) || 315 test_bit(ATM_VF_CLOSE, &atmvcc->flags) || 316 !test_bit(ATM_VF_READY, &atmvcc->flags)) { 317 dev->stats.tx_dropped++; 318 dev_kfree_skb(skb); 319 goto out; 320 } 321 322 if (sock_owned_by_user(sk_atm(atmvcc))) { 323 netif_stop_queue(brvcc->device); 324 ret = NETDEV_TX_BUSY; 325 goto out; 326 } 327 328 if (!br2684_xmit_vcc(skb, dev, brvcc)) { 329 /* 330 * We should probably use netif_*_queue() here, but that 331 * involves added complication. We need to walk before 332 * we can run. 333 * 334 * Don't free here! this pointer might be no longer valid! 335 */ 336 dev->stats.tx_errors++; 337 dev->stats.tx_fifo_errors++; 338 } 339 out: 340 bh_unlock_sock(sk_atm(atmvcc)); 341 out_devs: 342 read_unlock(&devs_lock); 343 return ret; 344 } 345 346 /* 347 * We remember when the MAC gets set, so we don't override it later with 348 * the ESI of the ATM card of the first VC 349 */ 350 static int br2684_mac_addr(struct net_device *dev, void *p) 351 { 352 int err = eth_mac_addr(dev, p); 353 if (!err) 354 BRPRIV(dev)->mac_was_set = 1; 355 return err; 356 } 357 358 #ifdef CONFIG_ATM_BR2684_IPFILTER 359 /* this IOCTL is experimental. */ 360 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) 361 { 362 struct br2684_vcc *brvcc; 363 struct br2684_filter_set fs; 364 365 if (copy_from_user(&fs, arg, sizeof fs)) 366 return -EFAULT; 367 if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { 368 /* 369 * This is really a per-vcc thing, but we can also search 370 * by device. 371 */ 372 struct br2684_dev *brdev; 373 read_lock(&devs_lock); 374 brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); 375 if (brdev == NULL || list_empty(&brdev->brvccs) || 376 brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ 377 brvcc = NULL; 378 else 379 brvcc = list_entry_brvcc(brdev->brvccs.next); 380 read_unlock(&devs_lock); 381 if (brvcc == NULL) 382 return -ESRCH; 383 } else 384 brvcc = BR2684_VCC(atmvcc); 385 memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); 386 return 0; 387 } 388 389 /* Returns 1 if packet should be dropped */ 390 static inline int 391 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) 392 { 393 if (brvcc->filter.netmask == 0) 394 return 0; /* no filter in place */ 395 if (type == htons(ETH_P_IP) && 396 (((struct iphdr *)(skb->data))->daddr & brvcc->filter. 397 netmask) == brvcc->filter.prefix) 398 return 0; 399 if (type == htons(ETH_P_ARP)) 400 return 0; 401 /* 402 * TODO: we should probably filter ARPs too.. don't want to have 403 * them returning values that don't make sense, or is that ok? 404 */ 405 return 1; /* drop */ 406 } 407 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 408 409 static void br2684_close_vcc(struct br2684_vcc *brvcc) 410 { 411 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); 412 write_lock_irq(&devs_lock); 413 list_del(&brvcc->brvccs); 414 write_unlock_irq(&devs_lock); 415 brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ 416 brvcc->atmvcc->release_cb = brvcc->old_release_cb; 417 brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ 418 module_put(brvcc->old_owner); 419 kfree(brvcc); 420 } 421 422 /* when AAL5 PDU comes in: */ 423 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) 424 { 425 struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); 426 struct net_device *net_dev = brvcc->device; 427 struct br2684_dev *brdev = BRPRIV(net_dev); 428 429 pr_debug("\n"); 430 431 if (unlikely(skb == NULL)) { 432 /* skb==NULL means VCC is being destroyed */ 433 br2684_close_vcc(brvcc); 434 if (list_empty(&brdev->brvccs)) { 435 write_lock_irq(&devs_lock); 436 list_del(&brdev->br2684_devs); 437 write_unlock_irq(&devs_lock); 438 unregister_netdev(net_dev); 439 free_netdev(net_dev); 440 } 441 return; 442 } 443 444 skb_debug(skb); 445 atm_return(atmvcc, skb->truesize); 446 pr_debug("skb from brdev %p\n", brdev); 447 if (brvcc->encaps == e_llc) { 448 449 if (skb->len > 7 && skb->data[7] == 0x01) 450 __skb_trim(skb, skb->len - 4); 451 452 /* accept packets that have "ipv[46]" in the snap header */ 453 if ((skb->len >= (sizeof(llc_oui_ipv4))) && 454 (memcmp(skb->data, llc_oui_ipv4, 455 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { 456 if (memcmp(skb->data + 6, ethertype_ipv6, 457 sizeof(ethertype_ipv6)) == 0) 458 skb->protocol = htons(ETH_P_IPV6); 459 else if (memcmp(skb->data + 6, ethertype_ipv4, 460 sizeof(ethertype_ipv4)) == 0) 461 skb->protocol = htons(ETH_P_IP); 462 else 463 goto error; 464 skb_pull(skb, sizeof(llc_oui_ipv4)); 465 skb_reset_network_header(skb); 466 skb->pkt_type = PACKET_HOST; 467 /* 468 * Let us waste some time for checking the encapsulation. 469 * Note, that only 7 char is checked so frames with a valid FCS 470 * are also accepted (but FCS is not checked of course). 471 */ 472 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && 473 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { 474 skb_pull(skb, sizeof(llc_oui_pid_pad)); 475 skb->protocol = eth_type_trans(skb, net_dev); 476 } else 477 goto error; 478 479 } else { /* e_vc */ 480 if (brdev->payload == p_routed) { 481 struct iphdr *iph; 482 483 skb_reset_network_header(skb); 484 iph = ip_hdr(skb); 485 if (iph->version == 4) 486 skb->protocol = htons(ETH_P_IP); 487 else if (iph->version == 6) 488 skb->protocol = htons(ETH_P_IPV6); 489 else 490 goto error; 491 skb->pkt_type = PACKET_HOST; 492 } else { /* p_bridged */ 493 /* first 2 chars should be 0 */ 494 if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) 495 goto error; 496 skb_pull(skb, BR2684_PAD_LEN); 497 skb->protocol = eth_type_trans(skb, net_dev); 498 } 499 } 500 501 #ifdef CONFIG_ATM_BR2684_IPFILTER 502 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) 503 goto dropped; 504 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 505 skb->dev = net_dev; 506 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ 507 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); 508 skb_debug(skb); 509 /* sigh, interface is down? */ 510 if (unlikely(!(net_dev->flags & IFF_UP))) 511 goto dropped; 512 net_dev->stats.rx_packets++; 513 net_dev->stats.rx_bytes += skb->len; 514 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 515 netif_rx(skb); 516 return; 517 518 dropped: 519 net_dev->stats.rx_dropped++; 520 goto free_skb; 521 error: 522 net_dev->stats.rx_errors++; 523 free_skb: 524 dev_kfree_skb(skb); 525 } 526 527 /* 528 * Assign a vcc to a dev 529 * Note: we do not have explicit unassign, but look at _push() 530 */ 531 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) 532 { 533 struct br2684_vcc *brvcc; 534 struct br2684_dev *brdev; 535 struct net_device *net_dev; 536 struct atm_backend_br2684 be; 537 int err; 538 539 if (copy_from_user(&be, arg, sizeof be)) 540 return -EFAULT; 541 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); 542 if (!brvcc) 543 return -ENOMEM; 544 /* 545 * Allow two packets in the ATM queue. One actually being sent, and one 546 * for the ATM 'TX done' handler to send. It shouldn't take long to get 547 * the next one from the netdev queue, when we need it. More than that 548 * would be bufferbloat. 549 */ 550 atomic_set(&brvcc->qspace, 2); 551 write_lock_irq(&devs_lock); 552 net_dev = br2684_find_dev(&be.ifspec); 553 if (net_dev == NULL) { 554 pr_err("tried to attach to non-existent device\n"); 555 err = -ENXIO; 556 goto error; 557 } 558 brdev = BRPRIV(net_dev); 559 if (atmvcc->push == NULL) { 560 err = -EBADFD; 561 goto error; 562 } 563 if (!list_empty(&brdev->brvccs)) { 564 /* Only 1 VCC/dev right now */ 565 err = -EEXIST; 566 goto error; 567 } 568 if (be.fcs_in != BR2684_FCSIN_NO || 569 be.fcs_out != BR2684_FCSOUT_NO || 570 be.fcs_auto || be.has_vpiid || be.send_padding || 571 (be.encaps != BR2684_ENCAPS_VC && 572 be.encaps != BR2684_ENCAPS_LLC) || 573 be.min_size != 0) { 574 err = -EINVAL; 575 goto error; 576 } 577 pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); 578 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { 579 unsigned char *esi = atmvcc->dev->esi; 580 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) 581 memcpy(net_dev->dev_addr, esi, net_dev->addr_len); 582 else 583 net_dev->dev_addr[2] = 1; 584 } 585 list_add(&brvcc->brvccs, &brdev->brvccs); 586 write_unlock_irq(&devs_lock); 587 brvcc->device = net_dev; 588 brvcc->atmvcc = atmvcc; 589 atmvcc->user_back = brvcc; 590 brvcc->encaps = (enum br2684_encaps)be.encaps; 591 brvcc->old_push = atmvcc->push; 592 brvcc->old_pop = atmvcc->pop; 593 brvcc->old_release_cb = atmvcc->release_cb; 594 brvcc->old_owner = atmvcc->owner; 595 barrier(); 596 atmvcc->push = br2684_push; 597 atmvcc->pop = br2684_pop; 598 atmvcc->release_cb = br2684_release_cb; 599 atmvcc->owner = THIS_MODULE; 600 601 /* initialize netdev carrier state */ 602 if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) 603 netif_carrier_off(net_dev); 604 else 605 netif_carrier_on(net_dev); 606 607 __module_get(THIS_MODULE); 608 609 /* re-process everything received between connection setup and 610 backend setup */ 611 vcc_process_recv_queue(atmvcc); 612 return 0; 613 614 error: 615 write_unlock_irq(&devs_lock); 616 kfree(brvcc); 617 return err; 618 } 619 620 static const struct net_device_ops br2684_netdev_ops = { 621 .ndo_start_xmit = br2684_start_xmit, 622 .ndo_set_mac_address = br2684_mac_addr, 623 .ndo_validate_addr = eth_validate_addr, 624 }; 625 626 static const struct net_device_ops br2684_netdev_ops_routed = { 627 .ndo_start_xmit = br2684_start_xmit, 628 .ndo_set_mac_address = br2684_mac_addr, 629 }; 630 631 static void br2684_setup(struct net_device *netdev) 632 { 633 struct br2684_dev *brdev = BRPRIV(netdev); 634 635 ether_setup(netdev); 636 netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ 637 brdev->net_dev = netdev; 638 639 netdev->netdev_ops = &br2684_netdev_ops; 640 641 INIT_LIST_HEAD(&brdev->brvccs); 642 } 643 644 static void br2684_setup_routed(struct net_device *netdev) 645 { 646 struct br2684_dev *brdev = BRPRIV(netdev); 647 648 brdev->net_dev = netdev; 649 netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ 650 netdev->netdev_ops = &br2684_netdev_ops_routed; 651 netdev->addr_len = 0; 652 netdev->mtu = ETH_DATA_LEN; 653 netdev->min_mtu = 0; 654 netdev->max_mtu = ETH_MAX_MTU; 655 netdev->type = ARPHRD_PPP; 656 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 657 netdev->tx_queue_len = 100; 658 INIT_LIST_HEAD(&brdev->brvccs); 659 } 660 661 static int br2684_create(void __user *arg) 662 { 663 int err; 664 struct net_device *netdev; 665 struct br2684_dev *brdev; 666 struct atm_newif_br2684 ni; 667 enum br2684_payload payload; 668 669 pr_debug("\n"); 670 671 if (copy_from_user(&ni, arg, sizeof ni)) 672 return -EFAULT; 673 674 if (ni.media & BR2684_FLAG_ROUTED) 675 payload = p_routed; 676 else 677 payload = p_bridged; 678 ni.media &= 0xffff; /* strip flags */ 679 680 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) 681 return -EINVAL; 682 683 netdev = alloc_netdev(sizeof(struct br2684_dev), 684 ni.ifname[0] ? ni.ifname : "nas%d", 685 NET_NAME_UNKNOWN, 686 (payload == p_routed) ? br2684_setup_routed : br2684_setup); 687 if (!netdev) 688 return -ENOMEM; 689 690 brdev = BRPRIV(netdev); 691 692 pr_debug("registered netdev %s\n", netdev->name); 693 /* open, stop, do_ioctl ? */ 694 err = register_netdev(netdev); 695 if (err < 0) { 696 pr_err("register_netdev failed\n"); 697 free_netdev(netdev); 698 return err; 699 } 700 701 write_lock_irq(&devs_lock); 702 703 brdev->payload = payload; 704 705 if (list_empty(&br2684_devs)) { 706 /* 1st br2684 device */ 707 brdev->number = 1; 708 } else 709 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; 710 711 list_add_tail(&brdev->br2684_devs, &br2684_devs); 712 write_unlock_irq(&devs_lock); 713 return 0; 714 } 715 716 /* 717 * This handles ioctls actually performed on our vcc - we must return 718 * -ENOIOCTLCMD for any unrecognized ioctl 719 */ 720 static int br2684_ioctl(struct socket *sock, unsigned int cmd, 721 unsigned long arg) 722 { 723 struct atm_vcc *atmvcc = ATM_SD(sock); 724 void __user *argp = (void __user *)arg; 725 atm_backend_t b; 726 727 int err; 728 switch (cmd) { 729 case ATM_SETBACKEND: 730 case ATM_NEWBACKENDIF: 731 err = get_user(b, (atm_backend_t __user *) argp); 732 if (err) 733 return -EFAULT; 734 if (b != ATM_BACKEND_BR2684) 735 return -ENOIOCTLCMD; 736 if (!capable(CAP_NET_ADMIN)) 737 return -EPERM; 738 if (cmd == ATM_SETBACKEND) { 739 if (sock->state != SS_CONNECTED) 740 return -EINVAL; 741 return br2684_regvcc(atmvcc, argp); 742 } else { 743 return br2684_create(argp); 744 } 745 #ifdef CONFIG_ATM_BR2684_IPFILTER 746 case BR2684_SETFILT: 747 if (atmvcc->push != br2684_push) 748 return -ENOIOCTLCMD; 749 if (!capable(CAP_NET_ADMIN)) 750 return -EPERM; 751 err = br2684_setfilt(atmvcc, argp); 752 753 return err; 754 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 755 } 756 return -ENOIOCTLCMD; 757 } 758 759 static struct atm_ioctl br2684_ioctl_ops = { 760 .owner = THIS_MODULE, 761 .ioctl = br2684_ioctl, 762 }; 763 764 #ifdef CONFIG_PROC_FS 765 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) 766 __acquires(devs_lock) 767 { 768 read_lock(&devs_lock); 769 return seq_list_start(&br2684_devs, *pos); 770 } 771 772 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) 773 { 774 return seq_list_next(v, &br2684_devs, pos); 775 } 776 777 static void br2684_seq_stop(struct seq_file *seq, void *v) 778 __releases(devs_lock) 779 { 780 read_unlock(&devs_lock); 781 } 782 783 static int br2684_seq_show(struct seq_file *seq, void *v) 784 { 785 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, 786 br2684_devs); 787 const struct net_device *net_dev = brdev->net_dev; 788 const struct br2684_vcc *brvcc; 789 790 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", 791 net_dev->name, 792 brdev->number, 793 net_dev->dev_addr, 794 brdev->mac_was_set ? "set" : "auto"); 795 796 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { 797 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" 798 ", failed copies %u/%u" 799 "\n", brvcc->atmvcc->dev->number, 800 brvcc->atmvcc->vpi, brvcc->atmvcc->vci, 801 (brvcc->encaps == e_llc) ? "LLC" : "VC", 802 (brdev->payload == p_bridged) ? "bridged" : "routed", 803 brvcc->copies_failed, brvcc->copies_needed); 804 #ifdef CONFIG_ATM_BR2684_IPFILTER 805 if (brvcc->filter.netmask != 0) 806 seq_printf(seq, " filter=%pI4/%pI4\n", 807 &brvcc->filter.prefix, 808 &brvcc->filter.netmask); 809 #endif /* CONFIG_ATM_BR2684_IPFILTER */ 810 } 811 return 0; 812 } 813 814 static const struct seq_operations br2684_seq_ops = { 815 .start = br2684_seq_start, 816 .next = br2684_seq_next, 817 .stop = br2684_seq_stop, 818 .show = br2684_seq_show, 819 }; 820 821 extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ 822 #endif /* CONFIG_PROC_FS */ 823 824 static int __init br2684_init(void) 825 { 826 #ifdef CONFIG_PROC_FS 827 struct proc_dir_entry *p; 828 p = proc_create_seq("br2684", 0, atm_proc_root, &br2684_seq_ops); 829 if (p == NULL) 830 return -ENOMEM; 831 #endif 832 register_atm_ioctl(&br2684_ioctl_ops); 833 register_atmdevice_notifier(&atm_dev_notifier); 834 return 0; 835 } 836 837 static void __exit br2684_exit(void) 838 { 839 struct net_device *net_dev; 840 struct br2684_dev *brdev; 841 struct br2684_vcc *brvcc; 842 deregister_atm_ioctl(&br2684_ioctl_ops); 843 844 #ifdef CONFIG_PROC_FS 845 remove_proc_entry("br2684", atm_proc_root); 846 #endif 847 848 849 unregister_atmdevice_notifier(&atm_dev_notifier); 850 851 while (!list_empty(&br2684_devs)) { 852 net_dev = list_entry_brdev(br2684_devs.next); 853 brdev = BRPRIV(net_dev); 854 while (!list_empty(&brdev->brvccs)) { 855 brvcc = list_entry_brvcc(brdev->brvccs.next); 856 br2684_close_vcc(brvcc); 857 } 858 859 list_del(&brdev->br2684_devs); 860 unregister_netdev(net_dev); 861 free_netdev(net_dev); 862 } 863 } 864 865 module_init(br2684_init); 866 module_exit(br2684_exit); 867 868 MODULE_AUTHOR("Marcell GAL"); 869 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); 870 MODULE_LICENSE("GPL"); 871