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 <asm/system.h> 29 #include <asm/uaccess.h> 30 #include <linux/fcntl.h> 31 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 32 #include <linux/mm.h> 33 #include <linux/interrupt.h> 34 #include <linux/notifier.h> 35 #include <linux/netfilter.h> 36 #include <linux/init.h> 37 #include <net/rose.h> 38 #include <linux/seq_file.h> 39 40 static unsigned int rose_neigh_no = 1; 41 42 static struct rose_node *rose_node_list; 43 static DEFINE_SPINLOCK(rose_node_list_lock); 44 static struct rose_neigh *rose_neigh_list; 45 static DEFINE_SPINLOCK(rose_neigh_list_lock); 46 static struct rose_route *rose_route_list; 47 static DEFINE_SPINLOCK(rose_route_list_lock); 48 49 struct rose_neigh *rose_loopback_neigh; 50 51 /* 52 * Add a new route to a node, and in the process add the node and the 53 * neighbour if it is new. 54 */ 55 static int __must_check rose_add_node(struct rose_route_struct *rose_route, 56 struct net_device *dev) 57 { 58 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp; 59 struct rose_neigh *rose_neigh; 60 int i, res = 0; 61 62 spin_lock_bh(&rose_node_list_lock); 63 spin_lock_bh(&rose_neigh_list_lock); 64 65 rose_node = rose_node_list; 66 while (rose_node != NULL) { 67 if ((rose_node->mask == rose_route->mask) && 68 (rosecmpm(&rose_route->address, &rose_node->address, 69 rose_route->mask) == 0)) 70 break; 71 rose_node = rose_node->next; 72 } 73 74 if (rose_node != NULL && rose_node->loopback) { 75 res = -EINVAL; 76 goto out; 77 } 78 79 rose_neigh = rose_neigh_list; 80 while (rose_neigh != NULL) { 81 if (ax25cmp(&rose_route->neighbour, 82 &rose_neigh->callsign) == 0 && 83 rose_neigh->dev == dev) 84 break; 85 rose_neigh = rose_neigh->next; 86 } 87 88 if (rose_neigh == NULL) { 89 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC); 90 if (rose_neigh == NULL) { 91 res = -ENOMEM; 92 goto out; 93 } 94 95 rose_neigh->callsign = rose_route->neighbour; 96 rose_neigh->digipeat = NULL; 97 rose_neigh->ax25 = NULL; 98 rose_neigh->dev = dev; 99 rose_neigh->count = 0; 100 rose_neigh->use = 0; 101 rose_neigh->dce_mode = 0; 102 rose_neigh->loopback = 0; 103 rose_neigh->number = rose_neigh_no++; 104 rose_neigh->restarted = 0; 105 106 skb_queue_head_init(&rose_neigh->queue); 107 108 init_timer(&rose_neigh->ftimer); 109 init_timer(&rose_neigh->t0timer); 110 111 if (rose_route->ndigis != 0) { 112 rose_neigh->digipeat = 113 kmalloc(sizeof(ax25_digi), GFP_ATOMIC); 114 if (rose_neigh->digipeat == NULL) { 115 kfree(rose_neigh); 116 res = -ENOMEM; 117 goto out; 118 } 119 120 rose_neigh->digipeat->ndigi = rose_route->ndigis; 121 rose_neigh->digipeat->lastrepeat = -1; 122 123 for (i = 0; i < rose_route->ndigis; i++) { 124 rose_neigh->digipeat->calls[i] = 125 rose_route->digipeaters[i]; 126 rose_neigh->digipeat->repeated[i] = 0; 127 } 128 } 129 130 rose_neigh->next = rose_neigh_list; 131 rose_neigh_list = rose_neigh; 132 } 133 134 /* 135 * This is a new node to be inserted into the list. Find where it needs 136 * to be inserted into the list, and insert it. We want to be sure 137 * to order the list in descending order of mask size to ensure that 138 * later when we are searching this list the first match will be the 139 * best match. 140 */ 141 if (rose_node == NULL) { 142 rose_tmpn = rose_node_list; 143 rose_tmpp = NULL; 144 145 while (rose_tmpn != NULL) { 146 if (rose_tmpn->mask > rose_route->mask) { 147 rose_tmpp = rose_tmpn; 148 rose_tmpn = rose_tmpn->next; 149 } else { 150 break; 151 } 152 } 153 154 /* create new node */ 155 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC); 156 if (rose_node == NULL) { 157 res = -ENOMEM; 158 goto out; 159 } 160 161 rose_node->address = rose_route->address; 162 rose_node->mask = rose_route->mask; 163 rose_node->count = 1; 164 rose_node->loopback = 0; 165 rose_node->neighbour[0] = rose_neigh; 166 167 if (rose_tmpn == NULL) { 168 if (rose_tmpp == NULL) { /* Empty list */ 169 rose_node_list = rose_node; 170 rose_node->next = NULL; 171 } else { 172 rose_tmpp->next = rose_node; 173 rose_node->next = NULL; 174 } 175 } else { 176 if (rose_tmpp == NULL) { /* 1st node */ 177 rose_node->next = rose_node_list; 178 rose_node_list = rose_node; 179 } else { 180 rose_tmpp->next = rose_node; 181 rose_node->next = rose_tmpn; 182 } 183 } 184 rose_neigh->count++; 185 186 goto out; 187 } 188 189 /* We have space, slot it in */ 190 if (rose_node->count < 3) { 191 rose_node->neighbour[rose_node->count] = rose_neigh; 192 rose_node->count++; 193 rose_neigh->count++; 194 } 195 196 out: 197 spin_unlock_bh(&rose_neigh_list_lock); 198 spin_unlock_bh(&rose_node_list_lock); 199 200 return res; 201 } 202 203 /* 204 * Caller is holding rose_node_list_lock. 205 */ 206 static void rose_remove_node(struct rose_node *rose_node) 207 { 208 struct rose_node *s; 209 210 if ((s = rose_node_list) == rose_node) { 211 rose_node_list = rose_node->next; 212 kfree(rose_node); 213 return; 214 } 215 216 while (s != NULL && s->next != NULL) { 217 if (s->next == rose_node) { 218 s->next = rose_node->next; 219 kfree(rose_node); 220 return; 221 } 222 223 s = s->next; 224 } 225 } 226 227 /* 228 * Caller is holding rose_neigh_list_lock. 229 */ 230 static void rose_remove_neigh(struct rose_neigh *rose_neigh) 231 { 232 struct rose_neigh *s; 233 234 rose_stop_ftimer(rose_neigh); 235 rose_stop_t0timer(rose_neigh); 236 237 skb_queue_purge(&rose_neigh->queue); 238 239 if ((s = rose_neigh_list) == rose_neigh) { 240 rose_neigh_list = rose_neigh->next; 241 if (rose_neigh->ax25) 242 ax25_cb_put(rose_neigh->ax25); 243 kfree(rose_neigh->digipeat); 244 kfree(rose_neigh); 245 return; 246 } 247 248 while (s != NULL && s->next != NULL) { 249 if (s->next == rose_neigh) { 250 s->next = rose_neigh->next; 251 if (rose_neigh->ax25) 252 ax25_cb_put(rose_neigh->ax25); 253 kfree(rose_neigh->digipeat); 254 kfree(rose_neigh); 255 return; 256 } 257 258 s = s->next; 259 } 260 } 261 262 /* 263 * Caller is holding rose_route_list_lock. 264 */ 265 static void rose_remove_route(struct rose_route *rose_route) 266 { 267 struct rose_route *s; 268 269 if (rose_route->neigh1 != NULL) 270 rose_route->neigh1->use--; 271 272 if (rose_route->neigh2 != NULL) 273 rose_route->neigh2->use--; 274 275 if ((s = rose_route_list) == rose_route) { 276 rose_route_list = rose_route->next; 277 kfree(rose_route); 278 return; 279 } 280 281 while (s != NULL && s->next != NULL) { 282 if (s->next == rose_route) { 283 s->next = rose_route->next; 284 kfree(rose_route); 285 return; 286 } 287 288 s = s->next; 289 } 290 } 291 292 /* 293 * "Delete" a node. Strictly speaking remove a route to a node. The node 294 * is only deleted if no routes are left to it. 295 */ 296 static int rose_del_node(struct rose_route_struct *rose_route, 297 struct net_device *dev) 298 { 299 struct rose_node *rose_node; 300 struct rose_neigh *rose_neigh; 301 int i, err = 0; 302 303 spin_lock_bh(&rose_node_list_lock); 304 spin_lock_bh(&rose_neigh_list_lock); 305 306 rose_node = rose_node_list; 307 while (rose_node != NULL) { 308 if ((rose_node->mask == rose_route->mask) && 309 (rosecmpm(&rose_route->address, &rose_node->address, 310 rose_route->mask) == 0)) 311 break; 312 rose_node = rose_node->next; 313 } 314 315 if (rose_node == NULL || rose_node->loopback) { 316 err = -EINVAL; 317 goto out; 318 } 319 320 rose_neigh = rose_neigh_list; 321 while (rose_neigh != NULL) { 322 if (ax25cmp(&rose_route->neighbour, 323 &rose_neigh->callsign) == 0 && 324 rose_neigh->dev == dev) 325 break; 326 rose_neigh = rose_neigh->next; 327 } 328 329 if (rose_neigh == NULL) { 330 err = -EINVAL; 331 goto out; 332 } 333 334 for (i = 0; i < rose_node->count; i++) { 335 if (rose_node->neighbour[i] == rose_neigh) { 336 rose_neigh->count--; 337 338 if (rose_neigh->count == 0 && rose_neigh->use == 0) 339 rose_remove_neigh(rose_neigh); 340 341 rose_node->count--; 342 343 if (rose_node->count == 0) { 344 rose_remove_node(rose_node); 345 } else { 346 switch (i) { 347 case 0: 348 rose_node->neighbour[0] = 349 rose_node->neighbour[1]; 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 init_timer(&sn->ftimer); 395 init_timer(&sn->t0timer); 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 case 1: 512 t->neighbour[1] = t->neighbour[2]; 513 case 2: 514 break; 515 } 516 } 517 518 if (t->count <= 0) 519 rose_remove_node(t); 520 } 521 522 rose_remove_neigh(s); 523 } 524 spin_unlock_bh(&rose_neigh_list_lock); 525 spin_unlock_bh(&rose_node_list_lock); 526 } 527 528 #if 0 /* Currently unused */ 529 /* 530 * A device has been removed. Remove its links. 531 */ 532 void rose_route_device_down(struct net_device *dev) 533 { 534 struct rose_route *s, *rose_route; 535 536 spin_lock_bh(&rose_route_list_lock); 537 rose_route = rose_route_list; 538 while (rose_route != NULL) { 539 s = rose_route; 540 rose_route = rose_route->next; 541 542 if (s->neigh1->dev == dev || s->neigh2->dev == dev) 543 rose_remove_route(s); 544 } 545 spin_unlock_bh(&rose_route_list_lock); 546 } 547 #endif 548 549 /* 550 * Clear all nodes and neighbours out, except for neighbours with 551 * active connections going through them. 552 * Do not clear loopback neighbour and nodes. 553 */ 554 static int rose_clear_routes(void) 555 { 556 struct rose_neigh *s, *rose_neigh; 557 struct rose_node *t, *rose_node; 558 559 spin_lock_bh(&rose_node_list_lock); 560 spin_lock_bh(&rose_neigh_list_lock); 561 562 rose_neigh = rose_neigh_list; 563 rose_node = rose_node_list; 564 565 while (rose_node != NULL) { 566 t = rose_node; 567 rose_node = rose_node->next; 568 if (!t->loopback) 569 rose_remove_node(t); 570 } 571 572 while (rose_neigh != NULL) { 573 s = rose_neigh; 574 rose_neigh = rose_neigh->next; 575 576 if (s->use == 0 && !s->loopback) { 577 s->count = 0; 578 rose_remove_neigh(s); 579 } 580 } 581 582 spin_unlock_bh(&rose_neigh_list_lock); 583 spin_unlock_bh(&rose_node_list_lock); 584 585 return 0; 586 } 587 588 /* 589 * Check that the device given is a valid AX.25 interface that is "up". 590 * called with RTNL 591 */ 592 static struct net_device *rose_ax25_dev_find(char *devname) 593 { 594 struct net_device *dev; 595 596 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL) 597 return NULL; 598 599 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 600 return dev; 601 602 return NULL; 603 } 604 605 /* 606 * Find the first active ROSE device, usually "rose0". 607 */ 608 struct net_device *rose_dev_first(void) 609 { 610 struct net_device *dev, *first = NULL; 611 612 rcu_read_lock(); 613 for_each_netdev_rcu(&init_net, dev) { 614 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE) 615 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 616 first = dev; 617 } 618 rcu_read_unlock(); 619 620 return first; 621 } 622 623 /* 624 * Find the ROSE device for the given address. 625 */ 626 struct net_device *rose_dev_get(rose_address *addr) 627 { 628 struct net_device *dev; 629 630 rcu_read_lock(); 631 for_each_netdev_rcu(&init_net, dev) { 632 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) { 633 dev_hold(dev); 634 goto out; 635 } 636 } 637 dev = NULL; 638 out: 639 rcu_read_unlock(); 640 return dev; 641 } 642 643 static int rose_dev_exists(rose_address *addr) 644 { 645 struct net_device *dev; 646 647 rcu_read_lock(); 648 for_each_netdev_rcu(&init_net, dev) { 649 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) 650 goto out; 651 } 652 dev = NULL; 653 out: 654 rcu_read_unlock(); 655 return dev != NULL; 656 } 657 658 659 660 661 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) 662 { 663 struct rose_route *rose_route; 664 665 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) 666 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || 667 (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) 668 return rose_route; 669 670 return NULL; 671 } 672 673 /* 674 * Find a neighbour or a route given a ROSE address. 675 */ 676 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, 677 unsigned char *diagnostic, int route_frame) 678 { 679 struct rose_neigh *res = NULL; 680 struct rose_node *node; 681 int failed = 0; 682 int i; 683 684 if (!route_frame) spin_lock_bh(&rose_node_list_lock); 685 for (node = rose_node_list; node != NULL; node = node->next) { 686 if (rosecmpm(addr, &node->address, node->mask) == 0) { 687 for (i = 0; i < node->count; i++) { 688 if (node->neighbour[i]->restarted) { 689 res = node->neighbour[i]; 690 goto out; 691 } 692 } 693 } 694 } 695 if (!route_frame) { /* connect request */ 696 for (node = rose_node_list; node != NULL; node = node->next) { 697 if (rosecmpm(addr, &node->address, node->mask) == 0) { 698 for (i = 0; i < node->count; i++) { 699 if (!rose_ftimer_running(node->neighbour[i])) { 700 res = node->neighbour[i]; 701 failed = 0; 702 goto out; 703 } 704 failed = 1; 705 } 706 } 707 } 708 } 709 710 if (failed) { 711 *cause = ROSE_OUT_OF_ORDER; 712 *diagnostic = 0; 713 } else { 714 *cause = ROSE_NOT_OBTAINABLE; 715 *diagnostic = 0; 716 } 717 718 out: 719 if (!route_frame) spin_unlock_bh(&rose_node_list_lock); 720 return res; 721 } 722 723 /* 724 * Handle the ioctls that control the routing functions. 725 */ 726 int rose_rt_ioctl(unsigned int cmd, void __user *arg) 727 { 728 struct rose_route_struct rose_route; 729 struct net_device *dev; 730 int err; 731 732 switch (cmd) { 733 case SIOCADDRT: 734 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 735 return -EFAULT; 736 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 737 return -EINVAL; 738 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ 739 return -EINVAL; 740 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ 741 return -EINVAL; 742 if (rose_route.ndigis > AX25_MAX_DIGIS) 743 return -EINVAL; 744 err = rose_add_node(&rose_route, dev); 745 return err; 746 747 case SIOCDELRT: 748 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 749 return -EFAULT; 750 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 751 return -EINVAL; 752 err = rose_del_node(&rose_route, dev); 753 return err; 754 755 case SIOCRSCLRRT: 756 return rose_clear_routes(); 757 758 default: 759 return -EINVAL; 760 } 761 762 return 0; 763 } 764 765 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) 766 { 767 struct rose_route *rose_route, *s; 768 769 rose_neigh->restarted = 0; 770 771 rose_stop_t0timer(rose_neigh); 772 rose_start_ftimer(rose_neigh); 773 774 skb_queue_purge(&rose_neigh->queue); 775 776 spin_lock_bh(&rose_route_list_lock); 777 778 rose_route = rose_route_list; 779 780 while (rose_route != NULL) { 781 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || 782 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || 783 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { 784 s = rose_route->next; 785 rose_remove_route(rose_route); 786 rose_route = s; 787 continue; 788 } 789 790 if (rose_route->neigh1 == rose_neigh) { 791 rose_route->neigh1->use--; 792 rose_route->neigh1 = NULL; 793 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); 794 } 795 796 if (rose_route->neigh2 == rose_neigh) { 797 rose_route->neigh2->use--; 798 rose_route->neigh2 = NULL; 799 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); 800 } 801 802 rose_route = rose_route->next; 803 } 804 spin_unlock_bh(&rose_route_list_lock); 805 } 806 807 /* 808 * A level 2 link has timed out, therefore it appears to be a poor link, 809 * then don't use that neighbour until it is reset. Blow away all through 810 * routes and connections using this route. 811 */ 812 void rose_link_failed(ax25_cb *ax25, int reason) 813 { 814 struct rose_neigh *rose_neigh; 815 816 spin_lock_bh(&rose_neigh_list_lock); 817 rose_neigh = rose_neigh_list; 818 while (rose_neigh != NULL) { 819 if (rose_neigh->ax25 == ax25) 820 break; 821 rose_neigh = rose_neigh->next; 822 } 823 824 if (rose_neigh != NULL) { 825 rose_neigh->ax25 = NULL; 826 ax25_cb_put(ax25); 827 828 rose_del_route_by_neigh(rose_neigh); 829 rose_kill_by_neigh(rose_neigh); 830 } 831 spin_unlock_bh(&rose_neigh_list_lock); 832 } 833 834 /* 835 * A device has been "downed" remove its link status. Blow away all 836 * through routes and connections that use this device. 837 */ 838 void rose_link_device_down(struct net_device *dev) 839 { 840 struct rose_neigh *rose_neigh; 841 842 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { 843 if (rose_neigh->dev == dev) { 844 rose_del_route_by_neigh(rose_neigh); 845 rose_kill_by_neigh(rose_neigh); 846 } 847 } 848 } 849 850 /* 851 * Route a frame to an appropriate AX.25 connection. 852 */ 853 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) 854 { 855 struct rose_neigh *rose_neigh, *new_neigh; 856 struct rose_route *rose_route; 857 struct rose_facilities_struct facilities; 858 rose_address *src_addr, *dest_addr; 859 struct sock *sk; 860 unsigned short frametype; 861 unsigned int lci, new_lci; 862 unsigned char cause, diagnostic; 863 struct net_device *dev; 864 int res = 0; 865 char buf[11]; 866 867 #if 0 868 if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) 869 return res; 870 #endif 871 872 if (skb->len < ROSE_MIN_LEN) 873 return res; 874 frametype = skb->data[2]; 875 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 876 if (frametype == ROSE_CALL_REQUEST && 877 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 878 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 879 ROSE_CALL_REQ_ADDR_LEN_VAL)) 880 return res; 881 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); 882 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 883 884 spin_lock_bh(&rose_neigh_list_lock); 885 spin_lock_bh(&rose_route_list_lock); 886 887 rose_neigh = rose_neigh_list; 888 while (rose_neigh != NULL) { 889 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && 890 ax25->ax25_dev->dev == rose_neigh->dev) 891 break; 892 rose_neigh = rose_neigh->next; 893 } 894 895 if (rose_neigh == NULL) { 896 printk("rose_route : unknown neighbour or device %s\n", 897 ax2asc(buf, &ax25->dest_addr)); 898 goto out; 899 } 900 901 /* 902 * Obviously the link is working, halt the ftimer. 903 */ 904 rose_stop_ftimer(rose_neigh); 905 906 /* 907 * LCI of zero is always for us, and its always a restart 908 * frame. 909 */ 910 if (lci == 0) { 911 rose_link_rx_restart(skb, rose_neigh, frametype); 912 goto out; 913 } 914 915 /* 916 * Find an existing socket. 917 */ 918 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { 919 if (frametype == ROSE_CALL_REQUEST) { 920 struct rose_sock *rose = rose_sk(sk); 921 922 /* Remove an existing unused socket */ 923 rose_clear_queues(sk); 924 rose->cause = ROSE_NETWORK_CONGESTION; 925 rose->diagnostic = 0; 926 rose->neighbour->use--; 927 rose->neighbour = NULL; 928 rose->lci = 0; 929 rose->state = ROSE_STATE_0; 930 sk->sk_state = TCP_CLOSE; 931 sk->sk_err = 0; 932 sk->sk_shutdown |= SEND_SHUTDOWN; 933 if (!sock_flag(sk, SOCK_DEAD)) { 934 sk->sk_state_change(sk); 935 sock_set_flag(sk, SOCK_DEAD); 936 } 937 } 938 else { 939 skb_reset_transport_header(skb); 940 res = rose_process_rx_frame(sk, skb); 941 goto out; 942 } 943 } 944 945 /* 946 * Is is a Call Request and is it for us ? 947 */ 948 if (frametype == ROSE_CALL_REQUEST) 949 if ((dev = rose_dev_get(dest_addr)) != NULL) { 950 res = rose_rx_call_request(skb, dev, rose_neigh, lci); 951 dev_put(dev); 952 goto out; 953 } 954 955 if (!sysctl_rose_routing_control) { 956 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); 957 goto out; 958 } 959 960 /* 961 * Route it to the next in line if we have an entry for it. 962 */ 963 rose_route = rose_route_list; 964 while (rose_route != NULL) { 965 if (rose_route->lci1 == lci && 966 rose_route->neigh1 == rose_neigh) { 967 if (frametype == ROSE_CALL_REQUEST) { 968 /* F6FBB - Remove an existing unused route */ 969 rose_remove_route(rose_route); 970 break; 971 } else if (rose_route->neigh2 != NULL) { 972 skb->data[0] &= 0xF0; 973 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 974 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 975 rose_transmit_link(skb, rose_route->neigh2); 976 if (frametype == ROSE_CLEAR_CONFIRMATION) 977 rose_remove_route(rose_route); 978 res = 1; 979 goto out; 980 } else { 981 if (frametype == ROSE_CLEAR_CONFIRMATION) 982 rose_remove_route(rose_route); 983 goto out; 984 } 985 } 986 if (rose_route->lci2 == lci && 987 rose_route->neigh2 == rose_neigh) { 988 if (frametype == ROSE_CALL_REQUEST) { 989 /* F6FBB - Remove an existing unused route */ 990 rose_remove_route(rose_route); 991 break; 992 } else if (rose_route->neigh1 != NULL) { 993 skb->data[0] &= 0xF0; 994 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; 995 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; 996 rose_transmit_link(skb, rose_route->neigh1); 997 if (frametype == ROSE_CLEAR_CONFIRMATION) 998 rose_remove_route(rose_route); 999 res = 1; 1000 goto out; 1001 } else { 1002 if (frametype == ROSE_CLEAR_CONFIRMATION) 1003 rose_remove_route(rose_route); 1004 goto out; 1005 } 1006 } 1007 rose_route = rose_route->next; 1008 } 1009 1010 /* 1011 * We know that: 1012 * 1. The frame isn't for us, 1013 * 2. It isn't "owned" by any existing route. 1014 */ 1015 if (frametype != ROSE_CALL_REQUEST) { /* XXX */ 1016 res = 0; 1017 goto out; 1018 } 1019 1020 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); 1021 1022 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, 1023 skb->len - ROSE_CALL_REQ_FACILITIES_OFF, 1024 &facilities)) { 1025 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); 1026 goto out; 1027 } 1028 1029 /* 1030 * Check for routing loops. 1031 */ 1032 rose_route = rose_route_list; 1033 while (rose_route != NULL) { 1034 if (rose_route->rand == facilities.rand && 1035 rosecmp(src_addr, &rose_route->src_addr) == 0 && 1036 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && 1037 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { 1038 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); 1039 goto out; 1040 } 1041 rose_route = rose_route->next; 1042 } 1043 1044 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { 1045 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); 1046 goto out; 1047 } 1048 1049 if ((new_lci = rose_new_lci(new_neigh)) == 0) { 1050 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); 1051 goto out; 1052 } 1053 1054 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { 1055 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); 1056 goto out; 1057 } 1058 1059 rose_route->lci1 = lci; 1060 rose_route->src_addr = *src_addr; 1061 rose_route->dest_addr = *dest_addr; 1062 rose_route->src_call = facilities.dest_call; 1063 rose_route->dest_call = facilities.source_call; 1064 rose_route->rand = facilities.rand; 1065 rose_route->neigh1 = rose_neigh; 1066 rose_route->lci2 = new_lci; 1067 rose_route->neigh2 = new_neigh; 1068 1069 rose_route->neigh1->use++; 1070 rose_route->neigh2->use++; 1071 1072 rose_route->next = rose_route_list; 1073 rose_route_list = rose_route; 1074 1075 skb->data[0] &= 0xF0; 1076 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 1077 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 1078 1079 rose_transmit_link(skb, rose_route->neigh2); 1080 res = 1; 1081 1082 out: 1083 spin_unlock_bh(&rose_route_list_lock); 1084 spin_unlock_bh(&rose_neigh_list_lock); 1085 1086 return res; 1087 } 1088 1089 #ifdef CONFIG_PROC_FS 1090 1091 static void *rose_node_start(struct seq_file *seq, loff_t *pos) 1092 __acquires(rose_node_list_lock) 1093 { 1094 struct rose_node *rose_node; 1095 int i = 1; 1096 1097 spin_lock_bh(&rose_node_list_lock); 1098 if (*pos == 0) 1099 return SEQ_START_TOKEN; 1100 1101 for (rose_node = rose_node_list; rose_node && i < *pos; 1102 rose_node = rose_node->next, ++i); 1103 1104 return (i == *pos) ? rose_node : NULL; 1105 } 1106 1107 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) 1108 { 1109 ++*pos; 1110 1111 return (v == SEQ_START_TOKEN) ? rose_node_list 1112 : ((struct rose_node *)v)->next; 1113 } 1114 1115 static void rose_node_stop(struct seq_file *seq, void *v) 1116 __releases(rose_node_list_lock) 1117 { 1118 spin_unlock_bh(&rose_node_list_lock); 1119 } 1120 1121 static int rose_node_show(struct seq_file *seq, void *v) 1122 { 1123 char rsbuf[11]; 1124 int i; 1125 1126 if (v == SEQ_START_TOKEN) 1127 seq_puts(seq, "address mask n neigh neigh neigh\n"); 1128 else { 1129 const struct rose_node *rose_node = v; 1130 /* if (rose_node->loopback) { 1131 seq_printf(seq, "%-10s %04d 1 loopback\n", 1132 rose2asc(rsbuf, &rose_node->address), 1133 rose_node->mask); 1134 } else { */ 1135 seq_printf(seq, "%-10s %04d %d", 1136 rose2asc(rsbuf, &rose_node->address), 1137 rose_node->mask, 1138 rose_node->count); 1139 1140 for (i = 0; i < rose_node->count; i++) 1141 seq_printf(seq, " %05d", 1142 rose_node->neighbour[i]->number); 1143 1144 seq_puts(seq, "\n"); 1145 /* } */ 1146 } 1147 return 0; 1148 } 1149 1150 static const struct seq_operations rose_node_seqops = { 1151 .start = rose_node_start, 1152 .next = rose_node_next, 1153 .stop = rose_node_stop, 1154 .show = rose_node_show, 1155 }; 1156 1157 static int rose_nodes_open(struct inode *inode, struct file *file) 1158 { 1159 return seq_open(file, &rose_node_seqops); 1160 } 1161 1162 const struct file_operations rose_nodes_fops = { 1163 .owner = THIS_MODULE, 1164 .open = rose_nodes_open, 1165 .read = seq_read, 1166 .llseek = seq_lseek, 1167 .release = seq_release, 1168 }; 1169 1170 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos) 1171 __acquires(rose_neigh_list_lock) 1172 { 1173 struct rose_neigh *rose_neigh; 1174 int i = 1; 1175 1176 spin_lock_bh(&rose_neigh_list_lock); 1177 if (*pos == 0) 1178 return SEQ_START_TOKEN; 1179 1180 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos; 1181 rose_neigh = rose_neigh->next, ++i); 1182 1183 return (i == *pos) ? rose_neigh : NULL; 1184 } 1185 1186 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 1187 { 1188 ++*pos; 1189 1190 return (v == SEQ_START_TOKEN) ? rose_neigh_list 1191 : ((struct rose_neigh *)v)->next; 1192 } 1193 1194 static void rose_neigh_stop(struct seq_file *seq, void *v) 1195 __releases(rose_neigh_list_lock) 1196 { 1197 spin_unlock_bh(&rose_neigh_list_lock); 1198 } 1199 1200 static int rose_neigh_show(struct seq_file *seq, void *v) 1201 { 1202 char buf[11]; 1203 int i; 1204 1205 if (v == SEQ_START_TOKEN) 1206 seq_puts(seq, 1207 "addr callsign dev count use mode restart t0 tf digipeaters\n"); 1208 else { 1209 struct rose_neigh *rose_neigh = v; 1210 1211 /* if (!rose_neigh->loopback) { */ 1212 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu", 1213 rose_neigh->number, 1214 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign), 1215 rose_neigh->dev ? rose_neigh->dev->name : "???", 1216 rose_neigh->count, 1217 rose_neigh->use, 1218 (rose_neigh->dce_mode) ? "DCE" : "DTE", 1219 (rose_neigh->restarted) ? "yes" : "no", 1220 ax25_display_timer(&rose_neigh->t0timer) / HZ, 1221 ax25_display_timer(&rose_neigh->ftimer) / HZ); 1222 1223 if (rose_neigh->digipeat != NULL) { 1224 for (i = 0; i < rose_neigh->digipeat->ndigi; i++) 1225 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i])); 1226 } 1227 1228 seq_puts(seq, "\n"); 1229 } 1230 return 0; 1231 } 1232 1233 1234 static const struct seq_operations rose_neigh_seqops = { 1235 .start = rose_neigh_start, 1236 .next = rose_neigh_next, 1237 .stop = rose_neigh_stop, 1238 .show = rose_neigh_show, 1239 }; 1240 1241 static int rose_neigh_open(struct inode *inode, struct file *file) 1242 { 1243 return seq_open(file, &rose_neigh_seqops); 1244 } 1245 1246 const struct file_operations rose_neigh_fops = { 1247 .owner = THIS_MODULE, 1248 .open = rose_neigh_open, 1249 .read = seq_read, 1250 .llseek = seq_lseek, 1251 .release = seq_release, 1252 }; 1253 1254 1255 static void *rose_route_start(struct seq_file *seq, loff_t *pos) 1256 __acquires(rose_route_list_lock) 1257 { 1258 struct rose_route *rose_route; 1259 int i = 1; 1260 1261 spin_lock_bh(&rose_route_list_lock); 1262 if (*pos == 0) 1263 return SEQ_START_TOKEN; 1264 1265 for (rose_route = rose_route_list; rose_route && i < *pos; 1266 rose_route = rose_route->next, ++i); 1267 1268 return (i == *pos) ? rose_route : NULL; 1269 } 1270 1271 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos) 1272 { 1273 ++*pos; 1274 1275 return (v == SEQ_START_TOKEN) ? rose_route_list 1276 : ((struct rose_route *)v)->next; 1277 } 1278 1279 static void rose_route_stop(struct seq_file *seq, void *v) 1280 __releases(rose_route_list_lock) 1281 { 1282 spin_unlock_bh(&rose_route_list_lock); 1283 } 1284 1285 static int rose_route_show(struct seq_file *seq, void *v) 1286 { 1287 char buf[11], rsbuf[11]; 1288 1289 if (v == SEQ_START_TOKEN) 1290 seq_puts(seq, 1291 "lci address callsign neigh <-> lci address callsign neigh\n"); 1292 else { 1293 struct rose_route *rose_route = v; 1294 1295 if (rose_route->neigh1) 1296 seq_printf(seq, 1297 "%3.3X %-10s %-9s %05d ", 1298 rose_route->lci1, 1299 rose2asc(rsbuf, &rose_route->src_addr), 1300 ax2asc(buf, &rose_route->src_call), 1301 rose_route->neigh1->number); 1302 else 1303 seq_puts(seq, 1304 "000 * * 00000 "); 1305 1306 if (rose_route->neigh2) 1307 seq_printf(seq, 1308 "%3.3X %-10s %-9s %05d\n", 1309 rose_route->lci2, 1310 rose2asc(rsbuf, &rose_route->dest_addr), 1311 ax2asc(buf, &rose_route->dest_call), 1312 rose_route->neigh2->number); 1313 else 1314 seq_puts(seq, 1315 "000 * * 00000\n"); 1316 } 1317 return 0; 1318 } 1319 1320 static const struct seq_operations rose_route_seqops = { 1321 .start = rose_route_start, 1322 .next = rose_route_next, 1323 .stop = rose_route_stop, 1324 .show = rose_route_show, 1325 }; 1326 1327 static int rose_route_open(struct inode *inode, struct file *file) 1328 { 1329 return seq_open(file, &rose_route_seqops); 1330 } 1331 1332 const struct file_operations rose_routes_fops = { 1333 .owner = THIS_MODULE, 1334 .open = rose_route_open, 1335 .read = seq_read, 1336 .llseek = seq_lseek, 1337 .release = seq_release, 1338 }; 1339 1340 #endif /* CONFIG_PROC_FS */ 1341 1342 /* 1343 * Release all memory associated with ROSE routing structures. 1344 */ 1345 void __exit rose_rt_free(void) 1346 { 1347 struct rose_neigh *s, *rose_neigh = rose_neigh_list; 1348 struct rose_node *t, *rose_node = rose_node_list; 1349 struct rose_route *u, *rose_route = rose_route_list; 1350 1351 while (rose_neigh != NULL) { 1352 s = rose_neigh; 1353 rose_neigh = rose_neigh->next; 1354 1355 rose_remove_neigh(s); 1356 } 1357 1358 while (rose_node != NULL) { 1359 t = rose_node; 1360 rose_node = rose_node->next; 1361 1362 rose_remove_node(t); 1363 } 1364 1365 while (rose_route != NULL) { 1366 u = rose_route; 1367 rose_route = rose_route->next; 1368 1369 rose_remove_route(u); 1370 } 1371 } 1372