1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net) 9 */ 10 #include <linux/errno.h> 11 #include <linux/types.h> 12 #include <linux/socket.h> 13 #include <linux/in.h> 14 #include <linux/kernel.h> 15 #include <linux/timer.h> 16 #include <linux/string.h> 17 #include <linux/sockios.h> 18 #include <linux/net.h> 19 #include <linux/slab.h> 20 #include <net/ax25.h> 21 #include <linux/inet.h> 22 #include <linux/netdevice.h> 23 #include <net/arp.h> 24 #include <linux/if_arp.h> 25 #include <linux/skbuff.h> 26 #include <net/sock.h> 27 #include <net/tcp_states.h> 28 #include <linux/uaccess.h> 29 #include <linux/fcntl.h> 30 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 31 #include <linux/mm.h> 32 #include <linux/interrupt.h> 33 #include <linux/notifier.h> 34 #include <linux/init.h> 35 #include <net/rose.h> 36 #include <linux/seq_file.h> 37 #include <linux/export.h> 38 39 static unsigned int rose_neigh_no = 1; 40 41 static struct rose_node *rose_node_list; 42 static DEFINE_SPINLOCK(rose_node_list_lock); 43 static struct rose_neigh *rose_neigh_list; 44 static DEFINE_SPINLOCK(rose_neigh_list_lock); 45 static struct rose_route *rose_route_list; 46 static DEFINE_SPINLOCK(rose_route_list_lock); 47 48 struct rose_neigh *rose_loopback_neigh; 49 50 /* 51 * Add a new route to a node, and in the process add the node and the 52 * neighbour if it is new. 53 */ 54 static int __must_check rose_add_node(struct rose_route_struct *rose_route, 55 struct net_device *dev) 56 { 57 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp; 58 struct rose_neigh *rose_neigh; 59 int i, res = 0; 60 61 spin_lock_bh(&rose_node_list_lock); 62 spin_lock_bh(&rose_neigh_list_lock); 63 64 rose_node = rose_node_list; 65 while (rose_node != NULL) { 66 if ((rose_node->mask == rose_route->mask) && 67 (rosecmpm(&rose_route->address, &rose_node->address, 68 rose_route->mask) == 0)) 69 break; 70 rose_node = rose_node->next; 71 } 72 73 if (rose_node != NULL && rose_node->loopback) { 74 res = -EINVAL; 75 goto out; 76 } 77 78 rose_neigh = rose_neigh_list; 79 while (rose_neigh != NULL) { 80 if (ax25cmp(&rose_route->neighbour, 81 &rose_neigh->callsign) == 0 && 82 rose_neigh->dev == dev) 83 break; 84 rose_neigh = rose_neigh->next; 85 } 86 87 if (rose_neigh == NULL) { 88 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC); 89 if (rose_neigh == NULL) { 90 res = -ENOMEM; 91 goto out; 92 } 93 94 rose_neigh->callsign = rose_route->neighbour; 95 rose_neigh->digipeat = NULL; 96 rose_neigh->ax25 = NULL; 97 rose_neigh->dev = dev; 98 rose_neigh->count = 0; 99 rose_neigh->use = 0; 100 rose_neigh->dce_mode = 0; 101 rose_neigh->loopback = 0; 102 rose_neigh->number = rose_neigh_no++; 103 rose_neigh->restarted = 0; 104 105 skb_queue_head_init(&rose_neigh->queue); 106 107 init_timer(&rose_neigh->ftimer); 108 init_timer(&rose_neigh->t0timer); 109 110 if (rose_route->ndigis != 0) { 111 rose_neigh->digipeat = 112 kmalloc(sizeof(ax25_digi), GFP_ATOMIC); 113 if (rose_neigh->digipeat == NULL) { 114 kfree(rose_neigh); 115 res = -ENOMEM; 116 goto out; 117 } 118 119 rose_neigh->digipeat->ndigi = rose_route->ndigis; 120 rose_neigh->digipeat->lastrepeat = -1; 121 122 for (i = 0; i < rose_route->ndigis; i++) { 123 rose_neigh->digipeat->calls[i] = 124 rose_route->digipeaters[i]; 125 rose_neigh->digipeat->repeated[i] = 0; 126 } 127 } 128 129 rose_neigh->next = rose_neigh_list; 130 rose_neigh_list = rose_neigh; 131 } 132 133 /* 134 * This is a new node to be inserted into the list. Find where it needs 135 * to be inserted into the list, and insert it. We want to be sure 136 * to order the list in descending order of mask size to ensure that 137 * later when we are searching this list the first match will be the 138 * best match. 139 */ 140 if (rose_node == NULL) { 141 rose_tmpn = rose_node_list; 142 rose_tmpp = NULL; 143 144 while (rose_tmpn != NULL) { 145 if (rose_tmpn->mask > rose_route->mask) { 146 rose_tmpp = rose_tmpn; 147 rose_tmpn = rose_tmpn->next; 148 } else { 149 break; 150 } 151 } 152 153 /* create new node */ 154 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC); 155 if (rose_node == NULL) { 156 res = -ENOMEM; 157 goto out; 158 } 159 160 rose_node->address = rose_route->address; 161 rose_node->mask = rose_route->mask; 162 rose_node->count = 1; 163 rose_node->loopback = 0; 164 rose_node->neighbour[0] = rose_neigh; 165 166 if (rose_tmpn == NULL) { 167 if (rose_tmpp == NULL) { /* Empty list */ 168 rose_node_list = rose_node; 169 rose_node->next = NULL; 170 } else { 171 rose_tmpp->next = rose_node; 172 rose_node->next = NULL; 173 } 174 } else { 175 if (rose_tmpp == NULL) { /* 1st node */ 176 rose_node->next = rose_node_list; 177 rose_node_list = rose_node; 178 } else { 179 rose_tmpp->next = rose_node; 180 rose_node->next = rose_tmpn; 181 } 182 } 183 rose_neigh->count++; 184 185 goto out; 186 } 187 188 /* We have space, slot it in */ 189 if (rose_node->count < 3) { 190 rose_node->neighbour[rose_node->count] = rose_neigh; 191 rose_node->count++; 192 rose_neigh->count++; 193 } 194 195 out: 196 spin_unlock_bh(&rose_neigh_list_lock); 197 spin_unlock_bh(&rose_node_list_lock); 198 199 return res; 200 } 201 202 /* 203 * Caller is holding rose_node_list_lock. 204 */ 205 static void rose_remove_node(struct rose_node *rose_node) 206 { 207 struct rose_node *s; 208 209 if ((s = rose_node_list) == rose_node) { 210 rose_node_list = rose_node->next; 211 kfree(rose_node); 212 return; 213 } 214 215 while (s != NULL && s->next != NULL) { 216 if (s->next == rose_node) { 217 s->next = rose_node->next; 218 kfree(rose_node); 219 return; 220 } 221 222 s = s->next; 223 } 224 } 225 226 /* 227 * Caller is holding rose_neigh_list_lock. 228 */ 229 static void rose_remove_neigh(struct rose_neigh *rose_neigh) 230 { 231 struct rose_neigh *s; 232 233 rose_stop_ftimer(rose_neigh); 234 rose_stop_t0timer(rose_neigh); 235 236 skb_queue_purge(&rose_neigh->queue); 237 238 if ((s = rose_neigh_list) == rose_neigh) { 239 rose_neigh_list = rose_neigh->next; 240 if (rose_neigh->ax25) 241 ax25_cb_put(rose_neigh->ax25); 242 kfree(rose_neigh->digipeat); 243 kfree(rose_neigh); 244 return; 245 } 246 247 while (s != NULL && s->next != NULL) { 248 if (s->next == rose_neigh) { 249 s->next = rose_neigh->next; 250 if (rose_neigh->ax25) 251 ax25_cb_put(rose_neigh->ax25); 252 kfree(rose_neigh->digipeat); 253 kfree(rose_neigh); 254 return; 255 } 256 257 s = s->next; 258 } 259 } 260 261 /* 262 * Caller is holding rose_route_list_lock. 263 */ 264 static void rose_remove_route(struct rose_route *rose_route) 265 { 266 struct rose_route *s; 267 268 if (rose_route->neigh1 != NULL) 269 rose_route->neigh1->use--; 270 271 if (rose_route->neigh2 != NULL) 272 rose_route->neigh2->use--; 273 274 if ((s = rose_route_list) == rose_route) { 275 rose_route_list = rose_route->next; 276 kfree(rose_route); 277 return; 278 } 279 280 while (s != NULL && s->next != NULL) { 281 if (s->next == rose_route) { 282 s->next = rose_route->next; 283 kfree(rose_route); 284 return; 285 } 286 287 s = s->next; 288 } 289 } 290 291 /* 292 * "Delete" a node. Strictly speaking remove a route to a node. The node 293 * is only deleted if no routes are left to it. 294 */ 295 static int rose_del_node(struct rose_route_struct *rose_route, 296 struct net_device *dev) 297 { 298 struct rose_node *rose_node; 299 struct rose_neigh *rose_neigh; 300 int i, err = 0; 301 302 spin_lock_bh(&rose_node_list_lock); 303 spin_lock_bh(&rose_neigh_list_lock); 304 305 rose_node = rose_node_list; 306 while (rose_node != NULL) { 307 if ((rose_node->mask == rose_route->mask) && 308 (rosecmpm(&rose_route->address, &rose_node->address, 309 rose_route->mask) == 0)) 310 break; 311 rose_node = rose_node->next; 312 } 313 314 if (rose_node == NULL || rose_node->loopback) { 315 err = -EINVAL; 316 goto out; 317 } 318 319 rose_neigh = rose_neigh_list; 320 while (rose_neigh != NULL) { 321 if (ax25cmp(&rose_route->neighbour, 322 &rose_neigh->callsign) == 0 && 323 rose_neigh->dev == dev) 324 break; 325 rose_neigh = rose_neigh->next; 326 } 327 328 if (rose_neigh == NULL) { 329 err = -EINVAL; 330 goto out; 331 } 332 333 for (i = 0; i < rose_node->count; i++) { 334 if (rose_node->neighbour[i] == rose_neigh) { 335 rose_neigh->count--; 336 337 if (rose_neigh->count == 0 && rose_neigh->use == 0) 338 rose_remove_neigh(rose_neigh); 339 340 rose_node->count--; 341 342 if (rose_node->count == 0) { 343 rose_remove_node(rose_node); 344 } else { 345 switch (i) { 346 case 0: 347 rose_node->neighbour[0] = 348 rose_node->neighbour[1]; 349 case 1: 350 rose_node->neighbour[1] = 351 rose_node->neighbour[2]; 352 case 2: 353 break; 354 } 355 } 356 goto out; 357 } 358 } 359 err = -EINVAL; 360 361 out: 362 spin_unlock_bh(&rose_neigh_list_lock); 363 spin_unlock_bh(&rose_node_list_lock); 364 365 return err; 366 } 367 368 /* 369 * Add the loopback neighbour. 370 */ 371 void rose_add_loopback_neigh(void) 372 { 373 struct rose_neigh *sn; 374 375 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL); 376 if (!rose_loopback_neigh) 377 return; 378 sn = rose_loopback_neigh; 379 380 sn->callsign = null_ax25_address; 381 sn->digipeat = NULL; 382 sn->ax25 = NULL; 383 sn->dev = NULL; 384 sn->count = 0; 385 sn->use = 0; 386 sn->dce_mode = 1; 387 sn->loopback = 1; 388 sn->number = rose_neigh_no++; 389 sn->restarted = 1; 390 391 skb_queue_head_init(&sn->queue); 392 393 init_timer(&sn->ftimer); 394 init_timer(&sn->t0timer); 395 396 spin_lock_bh(&rose_neigh_list_lock); 397 sn->next = rose_neigh_list; 398 rose_neigh_list = sn; 399 spin_unlock_bh(&rose_neigh_list_lock); 400 } 401 402 /* 403 * Add a loopback node. 404 */ 405 int rose_add_loopback_node(rose_address *address) 406 { 407 struct rose_node *rose_node; 408 int err = 0; 409 410 spin_lock_bh(&rose_node_list_lock); 411 412 rose_node = rose_node_list; 413 while (rose_node != NULL) { 414 if ((rose_node->mask == 10) && 415 (rosecmpm(address, &rose_node->address, 10) == 0) && 416 rose_node->loopback) 417 break; 418 rose_node = rose_node->next; 419 } 420 421 if (rose_node != NULL) 422 goto out; 423 424 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) { 425 err = -ENOMEM; 426 goto out; 427 } 428 429 rose_node->address = *address; 430 rose_node->mask = 10; 431 rose_node->count = 1; 432 rose_node->loopback = 1; 433 rose_node->neighbour[0] = rose_loopback_neigh; 434 435 /* Insert at the head of list. Address is always mask=10 */ 436 rose_node->next = rose_node_list; 437 rose_node_list = rose_node; 438 439 rose_loopback_neigh->count++; 440 441 out: 442 spin_unlock_bh(&rose_node_list_lock); 443 444 return err; 445 } 446 447 /* 448 * Delete a loopback node. 449 */ 450 void rose_del_loopback_node(rose_address *address) 451 { 452 struct rose_node *rose_node; 453 454 spin_lock_bh(&rose_node_list_lock); 455 456 rose_node = rose_node_list; 457 while (rose_node != NULL) { 458 if ((rose_node->mask == 10) && 459 (rosecmpm(address, &rose_node->address, 10) == 0) && 460 rose_node->loopback) 461 break; 462 rose_node = rose_node->next; 463 } 464 465 if (rose_node == NULL) 466 goto out; 467 468 rose_remove_node(rose_node); 469 470 rose_loopback_neigh->count--; 471 472 out: 473 spin_unlock_bh(&rose_node_list_lock); 474 } 475 476 /* 477 * A device has been removed. Remove its routes and neighbours. 478 */ 479 void rose_rt_device_down(struct net_device *dev) 480 { 481 struct rose_neigh *s, *rose_neigh; 482 struct rose_node *t, *rose_node; 483 int i; 484 485 spin_lock_bh(&rose_node_list_lock); 486 spin_lock_bh(&rose_neigh_list_lock); 487 rose_neigh = rose_neigh_list; 488 while (rose_neigh != NULL) { 489 s = rose_neigh; 490 rose_neigh = rose_neigh->next; 491 492 if (s->dev != dev) 493 continue; 494 495 rose_node = rose_node_list; 496 497 while (rose_node != NULL) { 498 t = rose_node; 499 rose_node = rose_node->next; 500 501 for (i = 0; i < t->count; i++) { 502 if (t->neighbour[i] != s) 503 continue; 504 505 t->count--; 506 507 switch (i) { 508 case 0: 509 t->neighbour[0] = t->neighbour[1]; 510 case 1: 511 t->neighbour[1] = t->neighbour[2]; 512 case 2: 513 break; 514 } 515 } 516 517 if (t->count <= 0) 518 rose_remove_node(t); 519 } 520 521 rose_remove_neigh(s); 522 } 523 spin_unlock_bh(&rose_neigh_list_lock); 524 spin_unlock_bh(&rose_node_list_lock); 525 } 526 527 #if 0 /* Currently unused */ 528 /* 529 * A device has been removed. Remove its links. 530 */ 531 void rose_route_device_down(struct net_device *dev) 532 { 533 struct rose_route *s, *rose_route; 534 535 spin_lock_bh(&rose_route_list_lock); 536 rose_route = rose_route_list; 537 while (rose_route != NULL) { 538 s = rose_route; 539 rose_route = rose_route->next; 540 541 if (s->neigh1->dev == dev || s->neigh2->dev == dev) 542 rose_remove_route(s); 543 } 544 spin_unlock_bh(&rose_route_list_lock); 545 } 546 #endif 547 548 /* 549 * Clear all nodes and neighbours out, except for neighbours with 550 * active connections going through them. 551 * Do not clear loopback neighbour and nodes. 552 */ 553 static int rose_clear_routes(void) 554 { 555 struct rose_neigh *s, *rose_neigh; 556 struct rose_node *t, *rose_node; 557 558 spin_lock_bh(&rose_node_list_lock); 559 spin_lock_bh(&rose_neigh_list_lock); 560 561 rose_neigh = rose_neigh_list; 562 rose_node = rose_node_list; 563 564 while (rose_node != NULL) { 565 t = rose_node; 566 rose_node = rose_node->next; 567 if (!t->loopback) 568 rose_remove_node(t); 569 } 570 571 while (rose_neigh != NULL) { 572 s = rose_neigh; 573 rose_neigh = rose_neigh->next; 574 575 if (s->use == 0 && !s->loopback) { 576 s->count = 0; 577 rose_remove_neigh(s); 578 } 579 } 580 581 spin_unlock_bh(&rose_neigh_list_lock); 582 spin_unlock_bh(&rose_node_list_lock); 583 584 return 0; 585 } 586 587 /* 588 * Check that the device given is a valid AX.25 interface that is "up". 589 * called with RTNL 590 */ 591 static struct net_device *rose_ax25_dev_find(char *devname) 592 { 593 struct net_device *dev; 594 595 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL) 596 return NULL; 597 598 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 599 return dev; 600 601 return NULL; 602 } 603 604 /* 605 * Find the first active ROSE device, usually "rose0". 606 */ 607 struct net_device *rose_dev_first(void) 608 { 609 struct net_device *dev, *first = NULL; 610 611 rcu_read_lock(); 612 for_each_netdev_rcu(&init_net, dev) { 613 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE) 614 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 615 first = dev; 616 } 617 rcu_read_unlock(); 618 619 return first; 620 } 621 622 /* 623 * Find the ROSE device for the given address. 624 */ 625 struct net_device *rose_dev_get(rose_address *addr) 626 { 627 struct net_device *dev; 628 629 rcu_read_lock(); 630 for_each_netdev_rcu(&init_net, dev) { 631 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) { 632 dev_hold(dev); 633 goto out; 634 } 635 } 636 dev = NULL; 637 out: 638 rcu_read_unlock(); 639 return dev; 640 } 641 642 static int rose_dev_exists(rose_address *addr) 643 { 644 struct net_device *dev; 645 646 rcu_read_lock(); 647 for_each_netdev_rcu(&init_net, dev) { 648 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) 649 goto out; 650 } 651 dev = NULL; 652 out: 653 rcu_read_unlock(); 654 return dev != NULL; 655 } 656 657 658 659 660 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) 661 { 662 struct rose_route *rose_route; 663 664 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) 665 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || 666 (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) 667 return rose_route; 668 669 return NULL; 670 } 671 672 /* 673 * Find a neighbour or a route given a ROSE address. 674 */ 675 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, 676 unsigned char *diagnostic, int route_frame) 677 { 678 struct rose_neigh *res = NULL; 679 struct rose_node *node; 680 int failed = 0; 681 int i; 682 683 if (!route_frame) spin_lock_bh(&rose_node_list_lock); 684 for (node = rose_node_list; node != NULL; node = node->next) { 685 if (rosecmpm(addr, &node->address, node->mask) == 0) { 686 for (i = 0; i < node->count; i++) { 687 if (node->neighbour[i]->restarted) { 688 res = node->neighbour[i]; 689 goto out; 690 } 691 } 692 } 693 } 694 if (!route_frame) { /* connect request */ 695 for (node = rose_node_list; node != NULL; node = node->next) { 696 if (rosecmpm(addr, &node->address, node->mask) == 0) { 697 for (i = 0; i < node->count; i++) { 698 if (!rose_ftimer_running(node->neighbour[i])) { 699 res = node->neighbour[i]; 700 failed = 0; 701 goto out; 702 } 703 failed = 1; 704 } 705 } 706 } 707 } 708 709 if (failed) { 710 *cause = ROSE_OUT_OF_ORDER; 711 *diagnostic = 0; 712 } else { 713 *cause = ROSE_NOT_OBTAINABLE; 714 *diagnostic = 0; 715 } 716 717 out: 718 if (!route_frame) spin_unlock_bh(&rose_node_list_lock); 719 return res; 720 } 721 722 /* 723 * Handle the ioctls that control the routing functions. 724 */ 725 int rose_rt_ioctl(unsigned int cmd, void __user *arg) 726 { 727 struct rose_route_struct rose_route; 728 struct net_device *dev; 729 int err; 730 731 switch (cmd) { 732 case SIOCADDRT: 733 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 734 return -EFAULT; 735 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 736 return -EINVAL; 737 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ 738 return -EINVAL; 739 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ 740 return -EINVAL; 741 if (rose_route.ndigis > AX25_MAX_DIGIS) 742 return -EINVAL; 743 err = rose_add_node(&rose_route, dev); 744 return err; 745 746 case SIOCDELRT: 747 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 748 return -EFAULT; 749 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 750 return -EINVAL; 751 err = rose_del_node(&rose_route, dev); 752 return err; 753 754 case SIOCRSCLRRT: 755 return rose_clear_routes(); 756 757 default: 758 return -EINVAL; 759 } 760 761 return 0; 762 } 763 764 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) 765 { 766 struct rose_route *rose_route, *s; 767 768 rose_neigh->restarted = 0; 769 770 rose_stop_t0timer(rose_neigh); 771 rose_start_ftimer(rose_neigh); 772 773 skb_queue_purge(&rose_neigh->queue); 774 775 spin_lock_bh(&rose_route_list_lock); 776 777 rose_route = rose_route_list; 778 779 while (rose_route != NULL) { 780 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || 781 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || 782 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { 783 s = rose_route->next; 784 rose_remove_route(rose_route); 785 rose_route = s; 786 continue; 787 } 788 789 if (rose_route->neigh1 == rose_neigh) { 790 rose_route->neigh1->use--; 791 rose_route->neigh1 = NULL; 792 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); 793 } 794 795 if (rose_route->neigh2 == rose_neigh) { 796 rose_route->neigh2->use--; 797 rose_route->neigh2 = NULL; 798 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); 799 } 800 801 rose_route = rose_route->next; 802 } 803 spin_unlock_bh(&rose_route_list_lock); 804 } 805 806 /* 807 * A level 2 link has timed out, therefore it appears to be a poor link, 808 * then don't use that neighbour until it is reset. Blow away all through 809 * routes and connections using this route. 810 */ 811 void rose_link_failed(ax25_cb *ax25, int reason) 812 { 813 struct rose_neigh *rose_neigh; 814 815 spin_lock_bh(&rose_neigh_list_lock); 816 rose_neigh = rose_neigh_list; 817 while (rose_neigh != NULL) { 818 if (rose_neigh->ax25 == ax25) 819 break; 820 rose_neigh = rose_neigh->next; 821 } 822 823 if (rose_neigh != NULL) { 824 rose_neigh->ax25 = NULL; 825 ax25_cb_put(ax25); 826 827 rose_del_route_by_neigh(rose_neigh); 828 rose_kill_by_neigh(rose_neigh); 829 } 830 spin_unlock_bh(&rose_neigh_list_lock); 831 } 832 833 /* 834 * A device has been "downed" remove its link status. Blow away all 835 * through routes and connections that use this device. 836 */ 837 void rose_link_device_down(struct net_device *dev) 838 { 839 struct rose_neigh *rose_neigh; 840 841 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { 842 if (rose_neigh->dev == dev) { 843 rose_del_route_by_neigh(rose_neigh); 844 rose_kill_by_neigh(rose_neigh); 845 } 846 } 847 } 848 849 /* 850 * Route a frame to an appropriate AX.25 connection. 851 */ 852 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) 853 { 854 struct rose_neigh *rose_neigh, *new_neigh; 855 struct rose_route *rose_route; 856 struct rose_facilities_struct facilities; 857 rose_address *src_addr, *dest_addr; 858 struct sock *sk; 859 unsigned short frametype; 860 unsigned int lci, new_lci; 861 unsigned char cause, diagnostic; 862 struct net_device *dev; 863 int res = 0; 864 char buf[11]; 865 866 if (skb->len < ROSE_MIN_LEN) 867 return res; 868 frametype = skb->data[2]; 869 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 870 if (frametype == ROSE_CALL_REQUEST && 871 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 872 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 873 ROSE_CALL_REQ_ADDR_LEN_VAL)) 874 return res; 875 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); 876 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 877 878 spin_lock_bh(&rose_neigh_list_lock); 879 spin_lock_bh(&rose_route_list_lock); 880 881 rose_neigh = rose_neigh_list; 882 while (rose_neigh != NULL) { 883 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && 884 ax25->ax25_dev->dev == rose_neigh->dev) 885 break; 886 rose_neigh = rose_neigh->next; 887 } 888 889 if (rose_neigh == NULL) { 890 printk("rose_route : unknown neighbour or device %s\n", 891 ax2asc(buf, &ax25->dest_addr)); 892 goto out; 893 } 894 895 /* 896 * Obviously the link is working, halt the ftimer. 897 */ 898 rose_stop_ftimer(rose_neigh); 899 900 /* 901 * LCI of zero is always for us, and its always a restart 902 * frame. 903 */ 904 if (lci == 0) { 905 rose_link_rx_restart(skb, rose_neigh, frametype); 906 goto out; 907 } 908 909 /* 910 * Find an existing socket. 911 */ 912 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { 913 if (frametype == ROSE_CALL_REQUEST) { 914 struct rose_sock *rose = rose_sk(sk); 915 916 /* Remove an existing unused socket */ 917 rose_clear_queues(sk); 918 rose->cause = ROSE_NETWORK_CONGESTION; 919 rose->diagnostic = 0; 920 rose->neighbour->use--; 921 rose->neighbour = NULL; 922 rose->lci = 0; 923 rose->state = ROSE_STATE_0; 924 sk->sk_state = TCP_CLOSE; 925 sk->sk_err = 0; 926 sk->sk_shutdown |= SEND_SHUTDOWN; 927 if (!sock_flag(sk, SOCK_DEAD)) { 928 sk->sk_state_change(sk); 929 sock_set_flag(sk, SOCK_DEAD); 930 } 931 } 932 else { 933 skb_reset_transport_header(skb); 934 res = rose_process_rx_frame(sk, skb); 935 goto out; 936 } 937 } 938 939 /* 940 * Is is a Call Request and is it for us ? 941 */ 942 if (frametype == ROSE_CALL_REQUEST) 943 if ((dev = rose_dev_get(dest_addr)) != NULL) { 944 res = rose_rx_call_request(skb, dev, rose_neigh, lci); 945 dev_put(dev); 946 goto out; 947 } 948 949 if (!sysctl_rose_routing_control) { 950 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); 951 goto out; 952 } 953 954 /* 955 * Route it to the next in line if we have an entry for it. 956 */ 957 rose_route = rose_route_list; 958 while (rose_route != NULL) { 959 if (rose_route->lci1 == lci && 960 rose_route->neigh1 == rose_neigh) { 961 if (frametype == ROSE_CALL_REQUEST) { 962 /* F6FBB - Remove an existing unused route */ 963 rose_remove_route(rose_route); 964 break; 965 } else if (rose_route->neigh2 != NULL) { 966 skb->data[0] &= 0xF0; 967 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 968 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 969 rose_transmit_link(skb, rose_route->neigh2); 970 if (frametype == ROSE_CLEAR_CONFIRMATION) 971 rose_remove_route(rose_route); 972 res = 1; 973 goto out; 974 } else { 975 if (frametype == ROSE_CLEAR_CONFIRMATION) 976 rose_remove_route(rose_route); 977 goto out; 978 } 979 } 980 if (rose_route->lci2 == lci && 981 rose_route->neigh2 == rose_neigh) { 982 if (frametype == ROSE_CALL_REQUEST) { 983 /* F6FBB - Remove an existing unused route */ 984 rose_remove_route(rose_route); 985 break; 986 } else if (rose_route->neigh1 != NULL) { 987 skb->data[0] &= 0xF0; 988 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; 989 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; 990 rose_transmit_link(skb, rose_route->neigh1); 991 if (frametype == ROSE_CLEAR_CONFIRMATION) 992 rose_remove_route(rose_route); 993 res = 1; 994 goto out; 995 } else { 996 if (frametype == ROSE_CLEAR_CONFIRMATION) 997 rose_remove_route(rose_route); 998 goto out; 999 } 1000 } 1001 rose_route = rose_route->next; 1002 } 1003 1004 /* 1005 * We know that: 1006 * 1. The frame isn't for us, 1007 * 2. It isn't "owned" by any existing route. 1008 */ 1009 if (frametype != ROSE_CALL_REQUEST) { /* XXX */ 1010 res = 0; 1011 goto out; 1012 } 1013 1014 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); 1015 1016 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, 1017 skb->len - ROSE_CALL_REQ_FACILITIES_OFF, 1018 &facilities)) { 1019 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); 1020 goto out; 1021 } 1022 1023 /* 1024 * Check for routing loops. 1025 */ 1026 rose_route = rose_route_list; 1027 while (rose_route != NULL) { 1028 if (rose_route->rand == facilities.rand && 1029 rosecmp(src_addr, &rose_route->src_addr) == 0 && 1030 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && 1031 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { 1032 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); 1033 goto out; 1034 } 1035 rose_route = rose_route->next; 1036 } 1037 1038 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { 1039 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); 1040 goto out; 1041 } 1042 1043 if ((new_lci = rose_new_lci(new_neigh)) == 0) { 1044 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); 1045 goto out; 1046 } 1047 1048 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { 1049 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); 1050 goto out; 1051 } 1052 1053 rose_route->lci1 = lci; 1054 rose_route->src_addr = *src_addr; 1055 rose_route->dest_addr = *dest_addr; 1056 rose_route->src_call = facilities.dest_call; 1057 rose_route->dest_call = facilities.source_call; 1058 rose_route->rand = facilities.rand; 1059 rose_route->neigh1 = rose_neigh; 1060 rose_route->lci2 = new_lci; 1061 rose_route->neigh2 = new_neigh; 1062 1063 rose_route->neigh1->use++; 1064 rose_route->neigh2->use++; 1065 1066 rose_route->next = rose_route_list; 1067 rose_route_list = rose_route; 1068 1069 skb->data[0] &= 0xF0; 1070 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 1071 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 1072 1073 rose_transmit_link(skb, rose_route->neigh2); 1074 res = 1; 1075 1076 out: 1077 spin_unlock_bh(&rose_route_list_lock); 1078 spin_unlock_bh(&rose_neigh_list_lock); 1079 1080 return res; 1081 } 1082 1083 #ifdef CONFIG_PROC_FS 1084 1085 static void *rose_node_start(struct seq_file *seq, loff_t *pos) 1086 __acquires(rose_node_list_lock) 1087 { 1088 struct rose_node *rose_node; 1089 int i = 1; 1090 1091 spin_lock_bh(&rose_node_list_lock); 1092 if (*pos == 0) 1093 return SEQ_START_TOKEN; 1094 1095 for (rose_node = rose_node_list; rose_node && i < *pos; 1096 rose_node = rose_node->next, ++i); 1097 1098 return (i == *pos) ? rose_node : NULL; 1099 } 1100 1101 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) 1102 { 1103 ++*pos; 1104 1105 return (v == SEQ_START_TOKEN) ? rose_node_list 1106 : ((struct rose_node *)v)->next; 1107 } 1108 1109 static void rose_node_stop(struct seq_file *seq, void *v) 1110 __releases(rose_node_list_lock) 1111 { 1112 spin_unlock_bh(&rose_node_list_lock); 1113 } 1114 1115 static int rose_node_show(struct seq_file *seq, void *v) 1116 { 1117 char rsbuf[11]; 1118 int i; 1119 1120 if (v == SEQ_START_TOKEN) 1121 seq_puts(seq, "address mask n neigh neigh neigh\n"); 1122 else { 1123 const struct rose_node *rose_node = v; 1124 /* if (rose_node->loopback) { 1125 seq_printf(seq, "%-10s %04d 1 loopback\n", 1126 rose2asc(rsbuf, &rose_node->address), 1127 rose_node->mask); 1128 } else { */ 1129 seq_printf(seq, "%-10s %04d %d", 1130 rose2asc(rsbuf, &rose_node->address), 1131 rose_node->mask, 1132 rose_node->count); 1133 1134 for (i = 0; i < rose_node->count; i++) 1135 seq_printf(seq, " %05d", 1136 rose_node->neighbour[i]->number); 1137 1138 seq_puts(seq, "\n"); 1139 /* } */ 1140 } 1141 return 0; 1142 } 1143 1144 static const struct seq_operations rose_node_seqops = { 1145 .start = rose_node_start, 1146 .next = rose_node_next, 1147 .stop = rose_node_stop, 1148 .show = rose_node_show, 1149 }; 1150 1151 static int rose_nodes_open(struct inode *inode, struct file *file) 1152 { 1153 return seq_open(file, &rose_node_seqops); 1154 } 1155 1156 const struct file_operations rose_nodes_fops = { 1157 .owner = THIS_MODULE, 1158 .open = rose_nodes_open, 1159 .read = seq_read, 1160 .llseek = seq_lseek, 1161 .release = seq_release, 1162 }; 1163 1164 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos) 1165 __acquires(rose_neigh_list_lock) 1166 { 1167 struct rose_neigh *rose_neigh; 1168 int i = 1; 1169 1170 spin_lock_bh(&rose_neigh_list_lock); 1171 if (*pos == 0) 1172 return SEQ_START_TOKEN; 1173 1174 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos; 1175 rose_neigh = rose_neigh->next, ++i); 1176 1177 return (i == *pos) ? rose_neigh : NULL; 1178 } 1179 1180 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 1181 { 1182 ++*pos; 1183 1184 return (v == SEQ_START_TOKEN) ? rose_neigh_list 1185 : ((struct rose_neigh *)v)->next; 1186 } 1187 1188 static void rose_neigh_stop(struct seq_file *seq, void *v) 1189 __releases(rose_neigh_list_lock) 1190 { 1191 spin_unlock_bh(&rose_neigh_list_lock); 1192 } 1193 1194 static int rose_neigh_show(struct seq_file *seq, void *v) 1195 { 1196 char buf[11]; 1197 int i; 1198 1199 if (v == SEQ_START_TOKEN) 1200 seq_puts(seq, 1201 "addr callsign dev count use mode restart t0 tf digipeaters\n"); 1202 else { 1203 struct rose_neigh *rose_neigh = v; 1204 1205 /* if (!rose_neigh->loopback) { */ 1206 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu", 1207 rose_neigh->number, 1208 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign), 1209 rose_neigh->dev ? rose_neigh->dev->name : "???", 1210 rose_neigh->count, 1211 rose_neigh->use, 1212 (rose_neigh->dce_mode) ? "DCE" : "DTE", 1213 (rose_neigh->restarted) ? "yes" : "no", 1214 ax25_display_timer(&rose_neigh->t0timer) / HZ, 1215 ax25_display_timer(&rose_neigh->ftimer) / HZ); 1216 1217 if (rose_neigh->digipeat != NULL) { 1218 for (i = 0; i < rose_neigh->digipeat->ndigi; i++) 1219 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i])); 1220 } 1221 1222 seq_puts(seq, "\n"); 1223 } 1224 return 0; 1225 } 1226 1227 1228 static const struct seq_operations rose_neigh_seqops = { 1229 .start = rose_neigh_start, 1230 .next = rose_neigh_next, 1231 .stop = rose_neigh_stop, 1232 .show = rose_neigh_show, 1233 }; 1234 1235 static int rose_neigh_open(struct inode *inode, struct file *file) 1236 { 1237 return seq_open(file, &rose_neigh_seqops); 1238 } 1239 1240 const struct file_operations rose_neigh_fops = { 1241 .owner = THIS_MODULE, 1242 .open = rose_neigh_open, 1243 .read = seq_read, 1244 .llseek = seq_lseek, 1245 .release = seq_release, 1246 }; 1247 1248 1249 static void *rose_route_start(struct seq_file *seq, loff_t *pos) 1250 __acquires(rose_route_list_lock) 1251 { 1252 struct rose_route *rose_route; 1253 int i = 1; 1254 1255 spin_lock_bh(&rose_route_list_lock); 1256 if (*pos == 0) 1257 return SEQ_START_TOKEN; 1258 1259 for (rose_route = rose_route_list; rose_route && i < *pos; 1260 rose_route = rose_route->next, ++i); 1261 1262 return (i == *pos) ? rose_route : NULL; 1263 } 1264 1265 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos) 1266 { 1267 ++*pos; 1268 1269 return (v == SEQ_START_TOKEN) ? rose_route_list 1270 : ((struct rose_route *)v)->next; 1271 } 1272 1273 static void rose_route_stop(struct seq_file *seq, void *v) 1274 __releases(rose_route_list_lock) 1275 { 1276 spin_unlock_bh(&rose_route_list_lock); 1277 } 1278 1279 static int rose_route_show(struct seq_file *seq, void *v) 1280 { 1281 char buf[11], rsbuf[11]; 1282 1283 if (v == SEQ_START_TOKEN) 1284 seq_puts(seq, 1285 "lci address callsign neigh <-> lci address callsign neigh\n"); 1286 else { 1287 struct rose_route *rose_route = v; 1288 1289 if (rose_route->neigh1) 1290 seq_printf(seq, 1291 "%3.3X %-10s %-9s %05d ", 1292 rose_route->lci1, 1293 rose2asc(rsbuf, &rose_route->src_addr), 1294 ax2asc(buf, &rose_route->src_call), 1295 rose_route->neigh1->number); 1296 else 1297 seq_puts(seq, 1298 "000 * * 00000 "); 1299 1300 if (rose_route->neigh2) 1301 seq_printf(seq, 1302 "%3.3X %-10s %-9s %05d\n", 1303 rose_route->lci2, 1304 rose2asc(rsbuf, &rose_route->dest_addr), 1305 ax2asc(buf, &rose_route->dest_call), 1306 rose_route->neigh2->number); 1307 else 1308 seq_puts(seq, 1309 "000 * * 00000\n"); 1310 } 1311 return 0; 1312 } 1313 1314 static const struct seq_operations rose_route_seqops = { 1315 .start = rose_route_start, 1316 .next = rose_route_next, 1317 .stop = rose_route_stop, 1318 .show = rose_route_show, 1319 }; 1320 1321 static int rose_route_open(struct inode *inode, struct file *file) 1322 { 1323 return seq_open(file, &rose_route_seqops); 1324 } 1325 1326 const struct file_operations rose_routes_fops = { 1327 .owner = THIS_MODULE, 1328 .open = rose_route_open, 1329 .read = seq_read, 1330 .llseek = seq_lseek, 1331 .release = seq_release, 1332 }; 1333 1334 #endif /* CONFIG_PROC_FS */ 1335 1336 /* 1337 * Release all memory associated with ROSE routing structures. 1338 */ 1339 void __exit rose_rt_free(void) 1340 { 1341 struct rose_neigh *s, *rose_neigh = rose_neigh_list; 1342 struct rose_node *t, *rose_node = rose_node_list; 1343 struct rose_route *u, *rose_route = rose_route_list; 1344 1345 while (rose_neigh != NULL) { 1346 s = rose_neigh; 1347 rose_neigh = rose_neigh->next; 1348 1349 rose_remove_neigh(s); 1350 } 1351 1352 while (rose_node != NULL) { 1353 t = rose_node; 1354 rose_node = rose_node->next; 1355 1356 rose_remove_node(t); 1357 } 1358 1359 while (rose_route != NULL) { 1360 u = rose_route; 1361 rose_route = rose_route->next; 1362 1363 rose_remove_route(u); 1364 } 1365 } 1366