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 timer_setup(&rose_neigh->ftimer, NULL, 0); 108 timer_setup(&rose_neigh->t0timer, NULL, 0); 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 /* fall through */ 350 case 1: 351 rose_node->neighbour[1] = 352 rose_node->neighbour[2]; 353 case 2: 354 break; 355 } 356 } 357 goto out; 358 } 359 } 360 err = -EINVAL; 361 362 out: 363 spin_unlock_bh(&rose_neigh_list_lock); 364 spin_unlock_bh(&rose_node_list_lock); 365 366 return err; 367 } 368 369 /* 370 * Add the loopback neighbour. 371 */ 372 void rose_add_loopback_neigh(void) 373 { 374 struct rose_neigh *sn; 375 376 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL); 377 if (!rose_loopback_neigh) 378 return; 379 sn = rose_loopback_neigh; 380 381 sn->callsign = null_ax25_address; 382 sn->digipeat = NULL; 383 sn->ax25 = NULL; 384 sn->dev = NULL; 385 sn->count = 0; 386 sn->use = 0; 387 sn->dce_mode = 1; 388 sn->loopback = 1; 389 sn->number = rose_neigh_no++; 390 sn->restarted = 1; 391 392 skb_queue_head_init(&sn->queue); 393 394 timer_setup(&sn->ftimer, NULL, 0); 395 timer_setup(&sn->t0timer, NULL, 0); 396 397 spin_lock_bh(&rose_neigh_list_lock); 398 sn->next = rose_neigh_list; 399 rose_neigh_list = sn; 400 spin_unlock_bh(&rose_neigh_list_lock); 401 } 402 403 /* 404 * Add a loopback node. 405 */ 406 int rose_add_loopback_node(rose_address *address) 407 { 408 struct rose_node *rose_node; 409 int err = 0; 410 411 spin_lock_bh(&rose_node_list_lock); 412 413 rose_node = rose_node_list; 414 while (rose_node != NULL) { 415 if ((rose_node->mask == 10) && 416 (rosecmpm(address, &rose_node->address, 10) == 0) && 417 rose_node->loopback) 418 break; 419 rose_node = rose_node->next; 420 } 421 422 if (rose_node != NULL) 423 goto out; 424 425 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) { 426 err = -ENOMEM; 427 goto out; 428 } 429 430 rose_node->address = *address; 431 rose_node->mask = 10; 432 rose_node->count = 1; 433 rose_node->loopback = 1; 434 rose_node->neighbour[0] = rose_loopback_neigh; 435 436 /* Insert at the head of list. Address is always mask=10 */ 437 rose_node->next = rose_node_list; 438 rose_node_list = rose_node; 439 440 rose_loopback_neigh->count++; 441 442 out: 443 spin_unlock_bh(&rose_node_list_lock); 444 445 return err; 446 } 447 448 /* 449 * Delete a loopback node. 450 */ 451 void rose_del_loopback_node(rose_address *address) 452 { 453 struct rose_node *rose_node; 454 455 spin_lock_bh(&rose_node_list_lock); 456 457 rose_node = rose_node_list; 458 while (rose_node != NULL) { 459 if ((rose_node->mask == 10) && 460 (rosecmpm(address, &rose_node->address, 10) == 0) && 461 rose_node->loopback) 462 break; 463 rose_node = rose_node->next; 464 } 465 466 if (rose_node == NULL) 467 goto out; 468 469 rose_remove_node(rose_node); 470 471 rose_loopback_neigh->count--; 472 473 out: 474 spin_unlock_bh(&rose_node_list_lock); 475 } 476 477 /* 478 * A device has been removed. Remove its routes and neighbours. 479 */ 480 void rose_rt_device_down(struct net_device *dev) 481 { 482 struct rose_neigh *s, *rose_neigh; 483 struct rose_node *t, *rose_node; 484 int i; 485 486 spin_lock_bh(&rose_node_list_lock); 487 spin_lock_bh(&rose_neigh_list_lock); 488 rose_neigh = rose_neigh_list; 489 while (rose_neigh != NULL) { 490 s = rose_neigh; 491 rose_neigh = rose_neigh->next; 492 493 if (s->dev != dev) 494 continue; 495 496 rose_node = rose_node_list; 497 498 while (rose_node != NULL) { 499 t = rose_node; 500 rose_node = rose_node->next; 501 502 for (i = 0; i < t->count; i++) { 503 if (t->neighbour[i] != s) 504 continue; 505 506 t->count--; 507 508 switch (i) { 509 case 0: 510 t->neighbour[0] = t->neighbour[1]; 511 /* fall through */ 512 case 1: 513 t->neighbour[1] = t->neighbour[2]; 514 case 2: 515 break; 516 } 517 } 518 519 if (t->count <= 0) 520 rose_remove_node(t); 521 } 522 523 rose_remove_neigh(s); 524 } 525 spin_unlock_bh(&rose_neigh_list_lock); 526 spin_unlock_bh(&rose_node_list_lock); 527 } 528 529 #if 0 /* Currently unused */ 530 /* 531 * A device has been removed. Remove its links. 532 */ 533 void rose_route_device_down(struct net_device *dev) 534 { 535 struct rose_route *s, *rose_route; 536 537 spin_lock_bh(&rose_route_list_lock); 538 rose_route = rose_route_list; 539 while (rose_route != NULL) { 540 s = rose_route; 541 rose_route = rose_route->next; 542 543 if (s->neigh1->dev == dev || s->neigh2->dev == dev) 544 rose_remove_route(s); 545 } 546 spin_unlock_bh(&rose_route_list_lock); 547 } 548 #endif 549 550 /* 551 * Clear all nodes and neighbours out, except for neighbours with 552 * active connections going through them. 553 * Do not clear loopback neighbour and nodes. 554 */ 555 static int rose_clear_routes(void) 556 { 557 struct rose_neigh *s, *rose_neigh; 558 struct rose_node *t, *rose_node; 559 560 spin_lock_bh(&rose_node_list_lock); 561 spin_lock_bh(&rose_neigh_list_lock); 562 563 rose_neigh = rose_neigh_list; 564 rose_node = rose_node_list; 565 566 while (rose_node != NULL) { 567 t = rose_node; 568 rose_node = rose_node->next; 569 if (!t->loopback) 570 rose_remove_node(t); 571 } 572 573 while (rose_neigh != NULL) { 574 s = rose_neigh; 575 rose_neigh = rose_neigh->next; 576 577 if (s->use == 0 && !s->loopback) { 578 s->count = 0; 579 rose_remove_neigh(s); 580 } 581 } 582 583 spin_unlock_bh(&rose_neigh_list_lock); 584 spin_unlock_bh(&rose_node_list_lock); 585 586 return 0; 587 } 588 589 /* 590 * Check that the device given is a valid AX.25 interface that is "up". 591 * called with RTNL 592 */ 593 static struct net_device *rose_ax25_dev_find(char *devname) 594 { 595 struct net_device *dev; 596 597 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL) 598 return NULL; 599 600 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 601 return dev; 602 603 return NULL; 604 } 605 606 /* 607 * Find the first active ROSE device, usually "rose0". 608 */ 609 struct net_device *rose_dev_first(void) 610 { 611 struct net_device *dev, *first = NULL; 612 613 rcu_read_lock(); 614 for_each_netdev_rcu(&init_net, dev) { 615 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE) 616 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 617 first = dev; 618 } 619 rcu_read_unlock(); 620 621 return first; 622 } 623 624 /* 625 * Find the ROSE device for the given address. 626 */ 627 struct net_device *rose_dev_get(rose_address *addr) 628 { 629 struct net_device *dev; 630 631 rcu_read_lock(); 632 for_each_netdev_rcu(&init_net, dev) { 633 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) { 634 dev_hold(dev); 635 goto out; 636 } 637 } 638 dev = NULL; 639 out: 640 rcu_read_unlock(); 641 return dev; 642 } 643 644 static int rose_dev_exists(rose_address *addr) 645 { 646 struct net_device *dev; 647 648 rcu_read_lock(); 649 for_each_netdev_rcu(&init_net, dev) { 650 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) 651 goto out; 652 } 653 dev = NULL; 654 out: 655 rcu_read_unlock(); 656 return dev != NULL; 657 } 658 659 660 661 662 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) 663 { 664 struct rose_route *rose_route; 665 666 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) 667 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || 668 (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) 669 return rose_route; 670 671 return NULL; 672 } 673 674 /* 675 * Find a neighbour or a route given a ROSE address. 676 */ 677 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, 678 unsigned char *diagnostic, int route_frame) 679 { 680 struct rose_neigh *res = NULL; 681 struct rose_node *node; 682 int failed = 0; 683 int i; 684 685 if (!route_frame) spin_lock_bh(&rose_node_list_lock); 686 for (node = rose_node_list; node != NULL; node = node->next) { 687 if (rosecmpm(addr, &node->address, node->mask) == 0) { 688 for (i = 0; i < node->count; i++) { 689 if (node->neighbour[i]->restarted) { 690 res = node->neighbour[i]; 691 goto out; 692 } 693 } 694 } 695 } 696 if (!route_frame) { /* connect request */ 697 for (node = rose_node_list; node != NULL; node = node->next) { 698 if (rosecmpm(addr, &node->address, node->mask) == 0) { 699 for (i = 0; i < node->count; i++) { 700 if (!rose_ftimer_running(node->neighbour[i])) { 701 res = node->neighbour[i]; 702 failed = 0; 703 goto out; 704 } 705 failed = 1; 706 } 707 } 708 } 709 } 710 711 if (failed) { 712 *cause = ROSE_OUT_OF_ORDER; 713 *diagnostic = 0; 714 } else { 715 *cause = ROSE_NOT_OBTAINABLE; 716 *diagnostic = 0; 717 } 718 719 out: 720 if (!route_frame) spin_unlock_bh(&rose_node_list_lock); 721 return res; 722 } 723 724 /* 725 * Handle the ioctls that control the routing functions. 726 */ 727 int rose_rt_ioctl(unsigned int cmd, void __user *arg) 728 { 729 struct rose_route_struct rose_route; 730 struct net_device *dev; 731 int err; 732 733 switch (cmd) { 734 case SIOCADDRT: 735 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 736 return -EFAULT; 737 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 738 return -EINVAL; 739 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ 740 return -EINVAL; 741 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ 742 return -EINVAL; 743 if (rose_route.ndigis > AX25_MAX_DIGIS) 744 return -EINVAL; 745 err = rose_add_node(&rose_route, dev); 746 return err; 747 748 case SIOCDELRT: 749 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 750 return -EFAULT; 751 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 752 return -EINVAL; 753 err = rose_del_node(&rose_route, dev); 754 return err; 755 756 case SIOCRSCLRRT: 757 return rose_clear_routes(); 758 759 default: 760 return -EINVAL; 761 } 762 763 return 0; 764 } 765 766 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) 767 { 768 struct rose_route *rose_route, *s; 769 770 rose_neigh->restarted = 0; 771 772 rose_stop_t0timer(rose_neigh); 773 rose_start_ftimer(rose_neigh); 774 775 skb_queue_purge(&rose_neigh->queue); 776 777 spin_lock_bh(&rose_route_list_lock); 778 779 rose_route = rose_route_list; 780 781 while (rose_route != NULL) { 782 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || 783 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || 784 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { 785 s = rose_route->next; 786 rose_remove_route(rose_route); 787 rose_route = s; 788 continue; 789 } 790 791 if (rose_route->neigh1 == rose_neigh) { 792 rose_route->neigh1->use--; 793 rose_route->neigh1 = NULL; 794 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); 795 } 796 797 if (rose_route->neigh2 == rose_neigh) { 798 rose_route->neigh2->use--; 799 rose_route->neigh2 = NULL; 800 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); 801 } 802 803 rose_route = rose_route->next; 804 } 805 spin_unlock_bh(&rose_route_list_lock); 806 } 807 808 /* 809 * A level 2 link has timed out, therefore it appears to be a poor link, 810 * then don't use that neighbour until it is reset. Blow away all through 811 * routes and connections using this route. 812 */ 813 void rose_link_failed(ax25_cb *ax25, int reason) 814 { 815 struct rose_neigh *rose_neigh; 816 817 spin_lock_bh(&rose_neigh_list_lock); 818 rose_neigh = rose_neigh_list; 819 while (rose_neigh != NULL) { 820 if (rose_neigh->ax25 == ax25) 821 break; 822 rose_neigh = rose_neigh->next; 823 } 824 825 if (rose_neigh != NULL) { 826 rose_neigh->ax25 = NULL; 827 ax25_cb_put(ax25); 828 829 rose_del_route_by_neigh(rose_neigh); 830 rose_kill_by_neigh(rose_neigh); 831 } 832 spin_unlock_bh(&rose_neigh_list_lock); 833 } 834 835 /* 836 * A device has been "downed" remove its link status. Blow away all 837 * through routes and connections that use this device. 838 */ 839 void rose_link_device_down(struct net_device *dev) 840 { 841 struct rose_neigh *rose_neigh; 842 843 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { 844 if (rose_neigh->dev == dev) { 845 rose_del_route_by_neigh(rose_neigh); 846 rose_kill_by_neigh(rose_neigh); 847 } 848 } 849 } 850 851 /* 852 * Route a frame to an appropriate AX.25 connection. 853 */ 854 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) 855 { 856 struct rose_neigh *rose_neigh, *new_neigh; 857 struct rose_route *rose_route; 858 struct rose_facilities_struct facilities; 859 rose_address *src_addr, *dest_addr; 860 struct sock *sk; 861 unsigned short frametype; 862 unsigned int lci, new_lci; 863 unsigned char cause, diagnostic; 864 struct net_device *dev; 865 int res = 0; 866 char buf[11]; 867 868 if (skb->len < ROSE_MIN_LEN) 869 return res; 870 frametype = skb->data[2]; 871 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 872 if (frametype == ROSE_CALL_REQUEST && 873 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 874 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 875 ROSE_CALL_REQ_ADDR_LEN_VAL)) 876 return res; 877 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); 878 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 879 880 spin_lock_bh(&rose_neigh_list_lock); 881 spin_lock_bh(&rose_route_list_lock); 882 883 rose_neigh = rose_neigh_list; 884 while (rose_neigh != NULL) { 885 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && 886 ax25->ax25_dev->dev == rose_neigh->dev) 887 break; 888 rose_neigh = rose_neigh->next; 889 } 890 891 if (rose_neigh == NULL) { 892 printk("rose_route : unknown neighbour or device %s\n", 893 ax2asc(buf, &ax25->dest_addr)); 894 goto out; 895 } 896 897 /* 898 * Obviously the link is working, halt the ftimer. 899 */ 900 rose_stop_ftimer(rose_neigh); 901 902 /* 903 * LCI of zero is always for us, and its always a restart 904 * frame. 905 */ 906 if (lci == 0) { 907 rose_link_rx_restart(skb, rose_neigh, frametype); 908 goto out; 909 } 910 911 /* 912 * Find an existing socket. 913 */ 914 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { 915 if (frametype == ROSE_CALL_REQUEST) { 916 struct rose_sock *rose = rose_sk(sk); 917 918 /* Remove an existing unused socket */ 919 rose_clear_queues(sk); 920 rose->cause = ROSE_NETWORK_CONGESTION; 921 rose->diagnostic = 0; 922 rose->neighbour->use--; 923 rose->neighbour = NULL; 924 rose->lci = 0; 925 rose->state = ROSE_STATE_0; 926 sk->sk_state = TCP_CLOSE; 927 sk->sk_err = 0; 928 sk->sk_shutdown |= SEND_SHUTDOWN; 929 if (!sock_flag(sk, SOCK_DEAD)) { 930 sk->sk_state_change(sk); 931 sock_set_flag(sk, SOCK_DEAD); 932 } 933 } 934 else { 935 skb_reset_transport_header(skb); 936 res = rose_process_rx_frame(sk, skb); 937 goto out; 938 } 939 } 940 941 /* 942 * Is is a Call Request and is it for us ? 943 */ 944 if (frametype == ROSE_CALL_REQUEST) 945 if ((dev = rose_dev_get(dest_addr)) != NULL) { 946 res = rose_rx_call_request(skb, dev, rose_neigh, lci); 947 dev_put(dev); 948 goto out; 949 } 950 951 if (!sysctl_rose_routing_control) { 952 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); 953 goto out; 954 } 955 956 /* 957 * Route it to the next in line if we have an entry for it. 958 */ 959 rose_route = rose_route_list; 960 while (rose_route != NULL) { 961 if (rose_route->lci1 == lci && 962 rose_route->neigh1 == rose_neigh) { 963 if (frametype == ROSE_CALL_REQUEST) { 964 /* F6FBB - Remove an existing unused route */ 965 rose_remove_route(rose_route); 966 break; 967 } else if (rose_route->neigh2 != NULL) { 968 skb->data[0] &= 0xF0; 969 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 970 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 971 rose_transmit_link(skb, rose_route->neigh2); 972 if (frametype == ROSE_CLEAR_CONFIRMATION) 973 rose_remove_route(rose_route); 974 res = 1; 975 goto out; 976 } else { 977 if (frametype == ROSE_CLEAR_CONFIRMATION) 978 rose_remove_route(rose_route); 979 goto out; 980 } 981 } 982 if (rose_route->lci2 == lci && 983 rose_route->neigh2 == rose_neigh) { 984 if (frametype == ROSE_CALL_REQUEST) { 985 /* F6FBB - Remove an existing unused route */ 986 rose_remove_route(rose_route); 987 break; 988 } else if (rose_route->neigh1 != NULL) { 989 skb->data[0] &= 0xF0; 990 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; 991 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; 992 rose_transmit_link(skb, rose_route->neigh1); 993 if (frametype == ROSE_CLEAR_CONFIRMATION) 994 rose_remove_route(rose_route); 995 res = 1; 996 goto out; 997 } else { 998 if (frametype == ROSE_CLEAR_CONFIRMATION) 999 rose_remove_route(rose_route); 1000 goto out; 1001 } 1002 } 1003 rose_route = rose_route->next; 1004 } 1005 1006 /* 1007 * We know that: 1008 * 1. The frame isn't for us, 1009 * 2. It isn't "owned" by any existing route. 1010 */ 1011 if (frametype != ROSE_CALL_REQUEST) { /* XXX */ 1012 res = 0; 1013 goto out; 1014 } 1015 1016 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); 1017 1018 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, 1019 skb->len - ROSE_CALL_REQ_FACILITIES_OFF, 1020 &facilities)) { 1021 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); 1022 goto out; 1023 } 1024 1025 /* 1026 * Check for routing loops. 1027 */ 1028 rose_route = rose_route_list; 1029 while (rose_route != NULL) { 1030 if (rose_route->rand == facilities.rand && 1031 rosecmp(src_addr, &rose_route->src_addr) == 0 && 1032 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && 1033 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { 1034 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); 1035 goto out; 1036 } 1037 rose_route = rose_route->next; 1038 } 1039 1040 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { 1041 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); 1042 goto out; 1043 } 1044 1045 if ((new_lci = rose_new_lci(new_neigh)) == 0) { 1046 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); 1047 goto out; 1048 } 1049 1050 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { 1051 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); 1052 goto out; 1053 } 1054 1055 rose_route->lci1 = lci; 1056 rose_route->src_addr = *src_addr; 1057 rose_route->dest_addr = *dest_addr; 1058 rose_route->src_call = facilities.dest_call; 1059 rose_route->dest_call = facilities.source_call; 1060 rose_route->rand = facilities.rand; 1061 rose_route->neigh1 = rose_neigh; 1062 rose_route->lci2 = new_lci; 1063 rose_route->neigh2 = new_neigh; 1064 1065 rose_route->neigh1->use++; 1066 rose_route->neigh2->use++; 1067 1068 rose_route->next = rose_route_list; 1069 rose_route_list = rose_route; 1070 1071 skb->data[0] &= 0xF0; 1072 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 1073 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 1074 1075 rose_transmit_link(skb, rose_route->neigh2); 1076 res = 1; 1077 1078 out: 1079 spin_unlock_bh(&rose_route_list_lock); 1080 spin_unlock_bh(&rose_neigh_list_lock); 1081 1082 return res; 1083 } 1084 1085 #ifdef CONFIG_PROC_FS 1086 1087 static void *rose_node_start(struct seq_file *seq, loff_t *pos) 1088 __acquires(rose_node_list_lock) 1089 { 1090 struct rose_node *rose_node; 1091 int i = 1; 1092 1093 spin_lock_bh(&rose_node_list_lock); 1094 if (*pos == 0) 1095 return SEQ_START_TOKEN; 1096 1097 for (rose_node = rose_node_list; rose_node && i < *pos; 1098 rose_node = rose_node->next, ++i); 1099 1100 return (i == *pos) ? rose_node : NULL; 1101 } 1102 1103 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) 1104 { 1105 ++*pos; 1106 1107 return (v == SEQ_START_TOKEN) ? rose_node_list 1108 : ((struct rose_node *)v)->next; 1109 } 1110 1111 static void rose_node_stop(struct seq_file *seq, void *v) 1112 __releases(rose_node_list_lock) 1113 { 1114 spin_unlock_bh(&rose_node_list_lock); 1115 } 1116 1117 static int rose_node_show(struct seq_file *seq, void *v) 1118 { 1119 char rsbuf[11]; 1120 int i; 1121 1122 if (v == SEQ_START_TOKEN) 1123 seq_puts(seq, "address mask n neigh neigh neigh\n"); 1124 else { 1125 const struct rose_node *rose_node = v; 1126 /* if (rose_node->loopback) { 1127 seq_printf(seq, "%-10s %04d 1 loopback\n", 1128 rose2asc(rsbuf, &rose_node->address), 1129 rose_node->mask); 1130 } else { */ 1131 seq_printf(seq, "%-10s %04d %d", 1132 rose2asc(rsbuf, &rose_node->address), 1133 rose_node->mask, 1134 rose_node->count); 1135 1136 for (i = 0; i < rose_node->count; i++) 1137 seq_printf(seq, " %05d", 1138 rose_node->neighbour[i]->number); 1139 1140 seq_puts(seq, "\n"); 1141 /* } */ 1142 } 1143 return 0; 1144 } 1145 1146 const struct seq_operations rose_node_seqops = { 1147 .start = rose_node_start, 1148 .next = rose_node_next, 1149 .stop = rose_node_stop, 1150 .show = rose_node_show, 1151 }; 1152 1153 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos) 1154 __acquires(rose_neigh_list_lock) 1155 { 1156 struct rose_neigh *rose_neigh; 1157 int i = 1; 1158 1159 spin_lock_bh(&rose_neigh_list_lock); 1160 if (*pos == 0) 1161 return SEQ_START_TOKEN; 1162 1163 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos; 1164 rose_neigh = rose_neigh->next, ++i); 1165 1166 return (i == *pos) ? rose_neigh : NULL; 1167 } 1168 1169 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 1170 { 1171 ++*pos; 1172 1173 return (v == SEQ_START_TOKEN) ? rose_neigh_list 1174 : ((struct rose_neigh *)v)->next; 1175 } 1176 1177 static void rose_neigh_stop(struct seq_file *seq, void *v) 1178 __releases(rose_neigh_list_lock) 1179 { 1180 spin_unlock_bh(&rose_neigh_list_lock); 1181 } 1182 1183 static int rose_neigh_show(struct seq_file *seq, void *v) 1184 { 1185 char buf[11]; 1186 int i; 1187 1188 if (v == SEQ_START_TOKEN) 1189 seq_puts(seq, 1190 "addr callsign dev count use mode restart t0 tf digipeaters\n"); 1191 else { 1192 struct rose_neigh *rose_neigh = v; 1193 1194 /* if (!rose_neigh->loopback) { */ 1195 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu", 1196 rose_neigh->number, 1197 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign), 1198 rose_neigh->dev ? rose_neigh->dev->name : "???", 1199 rose_neigh->count, 1200 rose_neigh->use, 1201 (rose_neigh->dce_mode) ? "DCE" : "DTE", 1202 (rose_neigh->restarted) ? "yes" : "no", 1203 ax25_display_timer(&rose_neigh->t0timer) / HZ, 1204 ax25_display_timer(&rose_neigh->ftimer) / HZ); 1205 1206 if (rose_neigh->digipeat != NULL) { 1207 for (i = 0; i < rose_neigh->digipeat->ndigi; i++) 1208 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i])); 1209 } 1210 1211 seq_puts(seq, "\n"); 1212 } 1213 return 0; 1214 } 1215 1216 1217 const struct seq_operations rose_neigh_seqops = { 1218 .start = rose_neigh_start, 1219 .next = rose_neigh_next, 1220 .stop = rose_neigh_stop, 1221 .show = rose_neigh_show, 1222 }; 1223 1224 static void *rose_route_start(struct seq_file *seq, loff_t *pos) 1225 __acquires(rose_route_list_lock) 1226 { 1227 struct rose_route *rose_route; 1228 int i = 1; 1229 1230 spin_lock_bh(&rose_route_list_lock); 1231 if (*pos == 0) 1232 return SEQ_START_TOKEN; 1233 1234 for (rose_route = rose_route_list; rose_route && i < *pos; 1235 rose_route = rose_route->next, ++i); 1236 1237 return (i == *pos) ? rose_route : NULL; 1238 } 1239 1240 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos) 1241 { 1242 ++*pos; 1243 1244 return (v == SEQ_START_TOKEN) ? rose_route_list 1245 : ((struct rose_route *)v)->next; 1246 } 1247 1248 static void rose_route_stop(struct seq_file *seq, void *v) 1249 __releases(rose_route_list_lock) 1250 { 1251 spin_unlock_bh(&rose_route_list_lock); 1252 } 1253 1254 static int rose_route_show(struct seq_file *seq, void *v) 1255 { 1256 char buf[11], rsbuf[11]; 1257 1258 if (v == SEQ_START_TOKEN) 1259 seq_puts(seq, 1260 "lci address callsign neigh <-> lci address callsign neigh\n"); 1261 else { 1262 struct rose_route *rose_route = v; 1263 1264 if (rose_route->neigh1) 1265 seq_printf(seq, 1266 "%3.3X %-10s %-9s %05d ", 1267 rose_route->lci1, 1268 rose2asc(rsbuf, &rose_route->src_addr), 1269 ax2asc(buf, &rose_route->src_call), 1270 rose_route->neigh1->number); 1271 else 1272 seq_puts(seq, 1273 "000 * * 00000 "); 1274 1275 if (rose_route->neigh2) 1276 seq_printf(seq, 1277 "%3.3X %-10s %-9s %05d\n", 1278 rose_route->lci2, 1279 rose2asc(rsbuf, &rose_route->dest_addr), 1280 ax2asc(buf, &rose_route->dest_call), 1281 rose_route->neigh2->number); 1282 else 1283 seq_puts(seq, 1284 "000 * * 00000\n"); 1285 } 1286 return 0; 1287 } 1288 1289 struct seq_operations rose_route_seqops = { 1290 .start = rose_route_start, 1291 .next = rose_route_next, 1292 .stop = rose_route_stop, 1293 .show = rose_route_show, 1294 }; 1295 #endif /* CONFIG_PROC_FS */ 1296 1297 /* 1298 * Release all memory associated with ROSE routing structures. 1299 */ 1300 void __exit rose_rt_free(void) 1301 { 1302 struct rose_neigh *s, *rose_neigh = rose_neigh_list; 1303 struct rose_node *t, *rose_node = rose_node_list; 1304 struct rose_route *u, *rose_route = rose_route_list; 1305 1306 while (rose_neigh != NULL) { 1307 s = rose_neigh; 1308 rose_neigh = rose_neigh->next; 1309 1310 rose_remove_neigh(s); 1311 } 1312 1313 while (rose_node != NULL) { 1314 t = rose_node; 1315 rose_node = rose_node->next; 1316 1317 rose_remove_node(t); 1318 } 1319 1320 while (rose_route != NULL) { 1321 u = rose_route; 1322 rose_route = rose_route->next; 1323 1324 rose_remove_route(u); 1325 } 1326 } 1327