1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 5 * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net) 6 */ 7 #include <linux/errno.h> 8 #include <linux/types.h> 9 #include <linux/socket.h> 10 #include <linux/in.h> 11 #include <linux/kernel.h> 12 #include <linux/timer.h> 13 #include <linux/string.h> 14 #include <linux/sockios.h> 15 #include <linux/net.h> 16 #include <linux/slab.h> 17 #include <net/ax25.h> 18 #include <linux/inet.h> 19 #include <linux/netdevice.h> 20 #include <net/arp.h> 21 #include <linux/if_arp.h> 22 #include <linux/skbuff.h> 23 #include <net/sock.h> 24 #include <net/tcp_states.h> 25 #include <linux/uaccess.h> 26 #include <linux/fcntl.h> 27 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 28 #include <linux/mm.h> 29 #include <linux/interrupt.h> 30 #include <linux/notifier.h> 31 #include <linux/init.h> 32 #include <net/rose.h> 33 #include <linux/seq_file.h> 34 #include <linux/export.h> 35 36 static unsigned int rose_neigh_no = 1; 37 38 static struct rose_node *rose_node_list; 39 static DEFINE_SPINLOCK(rose_node_list_lock); 40 static struct rose_neigh *rose_neigh_list; 41 static DEFINE_SPINLOCK(rose_neigh_list_lock); 42 static struct rose_route *rose_route_list; 43 static DEFINE_SPINLOCK(rose_route_list_lock); 44 45 struct rose_neigh *rose_loopback_neigh; 46 47 /* 48 * Add a new route to a node, and in the process add the node and the 49 * neighbour if it is new. 50 */ 51 static int __must_check rose_add_node(struct rose_route_struct *rose_route, 52 struct net_device *dev) 53 { 54 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp; 55 struct rose_neigh *rose_neigh; 56 int i, res = 0; 57 58 spin_lock_bh(&rose_node_list_lock); 59 spin_lock_bh(&rose_neigh_list_lock); 60 61 rose_node = rose_node_list; 62 while (rose_node != NULL) { 63 if ((rose_node->mask == rose_route->mask) && 64 (rosecmpm(&rose_route->address, &rose_node->address, 65 rose_route->mask) == 0)) 66 break; 67 rose_node = rose_node->next; 68 } 69 70 if (rose_node != NULL && rose_node->loopback) { 71 res = -EINVAL; 72 goto out; 73 } 74 75 rose_neigh = rose_neigh_list; 76 while (rose_neigh != NULL) { 77 if (ax25cmp(&rose_route->neighbour, 78 &rose_neigh->callsign) == 0 && 79 rose_neigh->dev == dev) 80 break; 81 rose_neigh = rose_neigh->next; 82 } 83 84 if (rose_neigh == NULL) { 85 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC); 86 if (rose_neigh == NULL) { 87 res = -ENOMEM; 88 goto out; 89 } 90 91 rose_neigh->callsign = rose_route->neighbour; 92 rose_neigh->digipeat = NULL; 93 rose_neigh->ax25 = NULL; 94 rose_neigh->dev = dev; 95 rose_neigh->count = 0; 96 rose_neigh->use = 0; 97 rose_neigh->dce_mode = 0; 98 rose_neigh->loopback = 0; 99 rose_neigh->number = rose_neigh_no++; 100 rose_neigh->restarted = 0; 101 102 skb_queue_head_init(&rose_neigh->queue); 103 104 timer_setup(&rose_neigh->ftimer, NULL, 0); 105 timer_setup(&rose_neigh->t0timer, NULL, 0); 106 107 if (rose_route->ndigis != 0) { 108 rose_neigh->digipeat = 109 kmalloc(sizeof(ax25_digi), GFP_ATOMIC); 110 if (rose_neigh->digipeat == NULL) { 111 kfree(rose_neigh); 112 res = -ENOMEM; 113 goto out; 114 } 115 116 rose_neigh->digipeat->ndigi = rose_route->ndigis; 117 rose_neigh->digipeat->lastrepeat = -1; 118 119 for (i = 0; i < rose_route->ndigis; i++) { 120 rose_neigh->digipeat->calls[i] = 121 rose_route->digipeaters[i]; 122 rose_neigh->digipeat->repeated[i] = 0; 123 } 124 } 125 126 rose_neigh->next = rose_neigh_list; 127 rose_neigh_list = rose_neigh; 128 } 129 130 /* 131 * This is a new node to be inserted into the list. Find where it needs 132 * to be inserted into the list, and insert it. We want to be sure 133 * to order the list in descending order of mask size to ensure that 134 * later when we are searching this list the first match will be the 135 * best match. 136 */ 137 if (rose_node == NULL) { 138 rose_tmpn = rose_node_list; 139 rose_tmpp = NULL; 140 141 while (rose_tmpn != NULL) { 142 if (rose_tmpn->mask > rose_route->mask) { 143 rose_tmpp = rose_tmpn; 144 rose_tmpn = rose_tmpn->next; 145 } else { 146 break; 147 } 148 } 149 150 /* create new node */ 151 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC); 152 if (rose_node == NULL) { 153 res = -ENOMEM; 154 goto out; 155 } 156 157 rose_node->address = rose_route->address; 158 rose_node->mask = rose_route->mask; 159 rose_node->count = 1; 160 rose_node->loopback = 0; 161 rose_node->neighbour[0] = rose_neigh; 162 163 if (rose_tmpn == NULL) { 164 if (rose_tmpp == NULL) { /* Empty list */ 165 rose_node_list = rose_node; 166 rose_node->next = NULL; 167 } else { 168 rose_tmpp->next = rose_node; 169 rose_node->next = NULL; 170 } 171 } else { 172 if (rose_tmpp == NULL) { /* 1st node */ 173 rose_node->next = rose_node_list; 174 rose_node_list = rose_node; 175 } else { 176 rose_tmpp->next = rose_node; 177 rose_node->next = rose_tmpn; 178 } 179 } 180 rose_neigh->count++; 181 182 goto out; 183 } 184 185 /* We have space, slot it in */ 186 if (rose_node->count < 3) { 187 rose_node->neighbour[rose_node->count] = rose_neigh; 188 rose_node->count++; 189 rose_neigh->count++; 190 } 191 192 out: 193 spin_unlock_bh(&rose_neigh_list_lock); 194 spin_unlock_bh(&rose_node_list_lock); 195 196 return res; 197 } 198 199 /* 200 * Caller is holding rose_node_list_lock. 201 */ 202 static void rose_remove_node(struct rose_node *rose_node) 203 { 204 struct rose_node *s; 205 206 if ((s = rose_node_list) == rose_node) { 207 rose_node_list = rose_node->next; 208 kfree(rose_node); 209 return; 210 } 211 212 while (s != NULL && s->next != NULL) { 213 if (s->next == rose_node) { 214 s->next = rose_node->next; 215 kfree(rose_node); 216 return; 217 } 218 219 s = s->next; 220 } 221 } 222 223 /* 224 * Caller is holding rose_neigh_list_lock. 225 */ 226 static void rose_remove_neigh(struct rose_neigh *rose_neigh) 227 { 228 struct rose_neigh *s; 229 230 del_timer_sync(&rose_neigh->ftimer); 231 del_timer_sync(&rose_neigh->t0timer); 232 233 skb_queue_purge(&rose_neigh->queue); 234 235 if ((s = rose_neigh_list) == rose_neigh) { 236 rose_neigh_list = rose_neigh->next; 237 if (rose_neigh->ax25) 238 ax25_cb_put(rose_neigh->ax25); 239 kfree(rose_neigh->digipeat); 240 kfree(rose_neigh); 241 return; 242 } 243 244 while (s != NULL && s->next != NULL) { 245 if (s->next == rose_neigh) { 246 s->next = rose_neigh->next; 247 if (rose_neigh->ax25) 248 ax25_cb_put(rose_neigh->ax25); 249 kfree(rose_neigh->digipeat); 250 kfree(rose_neigh); 251 return; 252 } 253 254 s = s->next; 255 } 256 } 257 258 /* 259 * Caller is holding rose_route_list_lock. 260 */ 261 static void rose_remove_route(struct rose_route *rose_route) 262 { 263 struct rose_route *s; 264 265 if (rose_route->neigh1 != NULL) 266 rose_route->neigh1->use--; 267 268 if (rose_route->neigh2 != NULL) 269 rose_route->neigh2->use--; 270 271 if ((s = rose_route_list) == rose_route) { 272 rose_route_list = rose_route->next; 273 kfree(rose_route); 274 return; 275 } 276 277 while (s != NULL && s->next != NULL) { 278 if (s->next == rose_route) { 279 s->next = rose_route->next; 280 kfree(rose_route); 281 return; 282 } 283 284 s = s->next; 285 } 286 } 287 288 /* 289 * "Delete" a node. Strictly speaking remove a route to a node. The node 290 * is only deleted if no routes are left to it. 291 */ 292 static int rose_del_node(struct rose_route_struct *rose_route, 293 struct net_device *dev) 294 { 295 struct rose_node *rose_node; 296 struct rose_neigh *rose_neigh; 297 int i, err = 0; 298 299 spin_lock_bh(&rose_node_list_lock); 300 spin_lock_bh(&rose_neigh_list_lock); 301 302 rose_node = rose_node_list; 303 while (rose_node != NULL) { 304 if ((rose_node->mask == rose_route->mask) && 305 (rosecmpm(&rose_route->address, &rose_node->address, 306 rose_route->mask) == 0)) 307 break; 308 rose_node = rose_node->next; 309 } 310 311 if (rose_node == NULL || rose_node->loopback) { 312 err = -EINVAL; 313 goto out; 314 } 315 316 rose_neigh = rose_neigh_list; 317 while (rose_neigh != NULL) { 318 if (ax25cmp(&rose_route->neighbour, 319 &rose_neigh->callsign) == 0 && 320 rose_neigh->dev == dev) 321 break; 322 rose_neigh = rose_neigh->next; 323 } 324 325 if (rose_neigh == NULL) { 326 err = -EINVAL; 327 goto out; 328 } 329 330 for (i = 0; i < rose_node->count; i++) { 331 if (rose_node->neighbour[i] == rose_neigh) { 332 rose_neigh->count--; 333 334 if (rose_neigh->count == 0 && rose_neigh->use == 0) 335 rose_remove_neigh(rose_neigh); 336 337 rose_node->count--; 338 339 if (rose_node->count == 0) { 340 rose_remove_node(rose_node); 341 } else { 342 switch (i) { 343 case 0: 344 rose_node->neighbour[0] = 345 rose_node->neighbour[1]; 346 fallthrough; 347 case 1: 348 rose_node->neighbour[1] = 349 rose_node->neighbour[2]; 350 break; 351 case 2: 352 break; 353 } 354 } 355 goto out; 356 } 357 } 358 err = -EINVAL; 359 360 out: 361 spin_unlock_bh(&rose_neigh_list_lock); 362 spin_unlock_bh(&rose_node_list_lock); 363 364 return err; 365 } 366 367 /* 368 * Add the loopback neighbour. 369 */ 370 void rose_add_loopback_neigh(void) 371 { 372 struct rose_neigh *sn; 373 374 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL); 375 if (!rose_loopback_neigh) 376 return; 377 sn = rose_loopback_neigh; 378 379 sn->callsign = null_ax25_address; 380 sn->digipeat = NULL; 381 sn->ax25 = NULL; 382 sn->dev = NULL; 383 sn->count = 0; 384 sn->use = 0; 385 sn->dce_mode = 1; 386 sn->loopback = 1; 387 sn->number = rose_neigh_no++; 388 sn->restarted = 1; 389 390 skb_queue_head_init(&sn->queue); 391 392 timer_setup(&sn->ftimer, NULL, 0); 393 timer_setup(&sn->t0timer, NULL, 0); 394 395 spin_lock_bh(&rose_neigh_list_lock); 396 sn->next = rose_neigh_list; 397 rose_neigh_list = sn; 398 spin_unlock_bh(&rose_neigh_list_lock); 399 } 400 401 /* 402 * Add a loopback node. 403 */ 404 int rose_add_loopback_node(const rose_address *address) 405 { 406 struct rose_node *rose_node; 407 int err = 0; 408 409 spin_lock_bh(&rose_node_list_lock); 410 411 rose_node = rose_node_list; 412 while (rose_node != NULL) { 413 if ((rose_node->mask == 10) && 414 (rosecmpm(address, &rose_node->address, 10) == 0) && 415 rose_node->loopback) 416 break; 417 rose_node = rose_node->next; 418 } 419 420 if (rose_node != NULL) 421 goto out; 422 423 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) { 424 err = -ENOMEM; 425 goto out; 426 } 427 428 rose_node->address = *address; 429 rose_node->mask = 10; 430 rose_node->count = 1; 431 rose_node->loopback = 1; 432 rose_node->neighbour[0] = rose_loopback_neigh; 433 434 /* Insert at the head of list. Address is always mask=10 */ 435 rose_node->next = rose_node_list; 436 rose_node_list = rose_node; 437 438 rose_loopback_neigh->count++; 439 440 out: 441 spin_unlock_bh(&rose_node_list_lock); 442 443 return err; 444 } 445 446 /* 447 * Delete a loopback node. 448 */ 449 void rose_del_loopback_node(const rose_address *address) 450 { 451 struct rose_node *rose_node; 452 453 spin_lock_bh(&rose_node_list_lock); 454 455 rose_node = rose_node_list; 456 while (rose_node != NULL) { 457 if ((rose_node->mask == 10) && 458 (rosecmpm(address, &rose_node->address, 10) == 0) && 459 rose_node->loopback) 460 break; 461 rose_node = rose_node->next; 462 } 463 464 if (rose_node == NULL) 465 goto out; 466 467 rose_remove_node(rose_node); 468 469 rose_loopback_neigh->count--; 470 471 out: 472 spin_unlock_bh(&rose_node_list_lock); 473 } 474 475 /* 476 * A device has been removed. Remove its routes and neighbours. 477 */ 478 void rose_rt_device_down(struct net_device *dev) 479 { 480 struct rose_neigh *s, *rose_neigh; 481 struct rose_node *t, *rose_node; 482 int i; 483 484 spin_lock_bh(&rose_node_list_lock); 485 spin_lock_bh(&rose_neigh_list_lock); 486 rose_neigh = rose_neigh_list; 487 while (rose_neigh != NULL) { 488 s = rose_neigh; 489 rose_neigh = rose_neigh->next; 490 491 if (s->dev != dev) 492 continue; 493 494 rose_node = rose_node_list; 495 496 while (rose_node != NULL) { 497 t = rose_node; 498 rose_node = rose_node->next; 499 500 for (i = 0; i < t->count; i++) { 501 if (t->neighbour[i] != s) 502 continue; 503 504 t->count--; 505 506 switch (i) { 507 case 0: 508 t->neighbour[0] = t->neighbour[1]; 509 fallthrough; 510 case 1: 511 t->neighbour[1] = t->neighbour[2]; 512 break; 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 if (first) 619 dev_hold(first); 620 rcu_read_unlock(); 621 622 return first; 623 } 624 625 /* 626 * Find the ROSE device for the given address. 627 */ 628 struct net_device *rose_dev_get(rose_address *addr) 629 { 630 struct net_device *dev; 631 632 rcu_read_lock(); 633 for_each_netdev_rcu(&init_net, dev) { 634 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && 635 rosecmp(addr, (const rose_address *)dev->dev_addr) == 0) { 636 dev_hold(dev); 637 goto out; 638 } 639 } 640 dev = NULL; 641 out: 642 rcu_read_unlock(); 643 return dev; 644 } 645 646 static int rose_dev_exists(rose_address *addr) 647 { 648 struct net_device *dev; 649 650 rcu_read_lock(); 651 for_each_netdev_rcu(&init_net, dev) { 652 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && 653 rosecmp(addr, (const rose_address *)dev->dev_addr) == 0) 654 goto out; 655 } 656 dev = NULL; 657 out: 658 rcu_read_unlock(); 659 return dev != NULL; 660 } 661 662 663 664 665 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) 666 { 667 struct rose_route *rose_route; 668 669 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) 670 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || 671 (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) 672 return rose_route; 673 674 return NULL; 675 } 676 677 /* 678 * Find a neighbour or a route given a ROSE address. 679 */ 680 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, 681 unsigned char *diagnostic, int route_frame) 682 { 683 struct rose_neigh *res = NULL; 684 struct rose_node *node; 685 int failed = 0; 686 int i; 687 688 if (!route_frame) spin_lock_bh(&rose_node_list_lock); 689 for (node = rose_node_list; node != NULL; node = node->next) { 690 if (rosecmpm(addr, &node->address, node->mask) == 0) { 691 for (i = 0; i < node->count; i++) { 692 if (node->neighbour[i]->restarted) { 693 res = node->neighbour[i]; 694 goto out; 695 } 696 } 697 } 698 } 699 if (!route_frame) { /* connect request */ 700 for (node = rose_node_list; node != NULL; node = node->next) { 701 if (rosecmpm(addr, &node->address, node->mask) == 0) { 702 for (i = 0; i < node->count; i++) { 703 if (!rose_ftimer_running(node->neighbour[i])) { 704 res = node->neighbour[i]; 705 goto out; 706 } 707 failed = 1; 708 } 709 } 710 } 711 } 712 713 if (failed) { 714 *cause = ROSE_OUT_OF_ORDER; 715 *diagnostic = 0; 716 } else { 717 *cause = ROSE_NOT_OBTAINABLE; 718 *diagnostic = 0; 719 } 720 721 out: 722 if (!route_frame) spin_unlock_bh(&rose_node_list_lock); 723 return res; 724 } 725 726 /* 727 * Handle the ioctls that control the routing functions. 728 */ 729 int rose_rt_ioctl(unsigned int cmd, void __user *arg) 730 { 731 struct rose_route_struct rose_route; 732 struct net_device *dev; 733 int err; 734 735 switch (cmd) { 736 case SIOCADDRT: 737 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 738 return -EFAULT; 739 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 740 return -EINVAL; 741 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ 742 return -EINVAL; 743 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ 744 return -EINVAL; 745 if (rose_route.ndigis > AX25_MAX_DIGIS) 746 return -EINVAL; 747 err = rose_add_node(&rose_route, dev); 748 return err; 749 750 case SIOCDELRT: 751 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 752 return -EFAULT; 753 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 754 return -EINVAL; 755 err = rose_del_node(&rose_route, dev); 756 return err; 757 758 case SIOCRSCLRRT: 759 return rose_clear_routes(); 760 761 default: 762 return -EINVAL; 763 } 764 765 return 0; 766 } 767 768 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) 769 { 770 struct rose_route *rose_route, *s; 771 772 rose_neigh->restarted = 0; 773 774 rose_stop_t0timer(rose_neigh); 775 rose_start_ftimer(rose_neigh); 776 777 skb_queue_purge(&rose_neigh->queue); 778 779 spin_lock_bh(&rose_route_list_lock); 780 781 rose_route = rose_route_list; 782 783 while (rose_route != NULL) { 784 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || 785 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || 786 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { 787 s = rose_route->next; 788 rose_remove_route(rose_route); 789 rose_route = s; 790 continue; 791 } 792 793 if (rose_route->neigh1 == rose_neigh) { 794 rose_route->neigh1->use--; 795 rose_route->neigh1 = NULL; 796 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); 797 } 798 799 if (rose_route->neigh2 == rose_neigh) { 800 rose_route->neigh2->use--; 801 rose_route->neigh2 = NULL; 802 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); 803 } 804 805 rose_route = rose_route->next; 806 } 807 spin_unlock_bh(&rose_route_list_lock); 808 } 809 810 /* 811 * A level 2 link has timed out, therefore it appears to be a poor link, 812 * then don't use that neighbour until it is reset. Blow away all through 813 * routes and connections using this route. 814 */ 815 void rose_link_failed(ax25_cb *ax25, int reason) 816 { 817 struct rose_neigh *rose_neigh; 818 819 spin_lock_bh(&rose_neigh_list_lock); 820 rose_neigh = rose_neigh_list; 821 while (rose_neigh != NULL) { 822 if (rose_neigh->ax25 == ax25) 823 break; 824 rose_neigh = rose_neigh->next; 825 } 826 827 if (rose_neigh != NULL) { 828 rose_neigh->ax25 = NULL; 829 ax25_cb_put(ax25); 830 831 rose_del_route_by_neigh(rose_neigh); 832 rose_kill_by_neigh(rose_neigh); 833 } 834 spin_unlock_bh(&rose_neigh_list_lock); 835 } 836 837 /* 838 * A device has been "downed" remove its link status. Blow away all 839 * through routes and connections that use this device. 840 */ 841 void rose_link_device_down(struct net_device *dev) 842 { 843 struct rose_neigh *rose_neigh; 844 845 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { 846 if (rose_neigh->dev == dev) { 847 rose_del_route_by_neigh(rose_neigh); 848 rose_kill_by_neigh(rose_neigh); 849 } 850 } 851 } 852 853 /* 854 * Route a frame to an appropriate AX.25 connection. 855 * A NULL ax25_cb indicates an internally generated frame. 856 */ 857 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) 858 { 859 struct rose_neigh *rose_neigh, *new_neigh; 860 struct rose_route *rose_route; 861 struct rose_facilities_struct facilities; 862 rose_address *src_addr, *dest_addr; 863 struct sock *sk; 864 unsigned short frametype; 865 unsigned int lci, new_lci; 866 unsigned char cause, diagnostic; 867 struct net_device *dev; 868 int res = 0; 869 char buf[11]; 870 871 if (skb->len < ROSE_MIN_LEN) 872 return res; 873 874 if (!ax25) 875 return rose_loopback_queue(skb, NULL); 876 877 frametype = skb->data[2]; 878 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 879 if (frametype == ROSE_CALL_REQUEST && 880 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 881 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 882 ROSE_CALL_REQ_ADDR_LEN_VAL)) 883 return res; 884 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); 885 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 886 887 spin_lock_bh(&rose_neigh_list_lock); 888 spin_lock_bh(&rose_route_list_lock); 889 890 rose_neigh = rose_neigh_list; 891 while (rose_neigh != NULL) { 892 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && 893 ax25->ax25_dev->dev == rose_neigh->dev) 894 break; 895 rose_neigh = rose_neigh->next; 896 } 897 898 if (rose_neigh == NULL) { 899 printk("rose_route : unknown neighbour or device %s\n", 900 ax2asc(buf, &ax25->dest_addr)); 901 goto out; 902 } 903 904 /* 905 * Obviously the link is working, halt the ftimer. 906 */ 907 rose_stop_ftimer(rose_neigh); 908 909 /* 910 * LCI of zero is always for us, and its always a restart 911 * frame. 912 */ 913 if (lci == 0) { 914 rose_link_rx_restart(skb, rose_neigh, frametype); 915 goto out; 916 } 917 918 /* 919 * Find an existing socket. 920 */ 921 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { 922 if (frametype == ROSE_CALL_REQUEST) { 923 struct rose_sock *rose = rose_sk(sk); 924 925 /* Remove an existing unused socket */ 926 rose_clear_queues(sk); 927 rose->cause = ROSE_NETWORK_CONGESTION; 928 rose->diagnostic = 0; 929 rose->neighbour->use--; 930 rose->neighbour = NULL; 931 rose->lci = 0; 932 rose->state = ROSE_STATE_0; 933 sk->sk_state = TCP_CLOSE; 934 sk->sk_err = 0; 935 sk->sk_shutdown |= SEND_SHUTDOWN; 936 if (!sock_flag(sk, SOCK_DEAD)) { 937 sk->sk_state_change(sk); 938 sock_set_flag(sk, SOCK_DEAD); 939 } 940 } 941 else { 942 skb_reset_transport_header(skb); 943 res = rose_process_rx_frame(sk, skb); 944 goto out; 945 } 946 } 947 948 /* 949 * Is is a Call Request and is it for us ? 950 */ 951 if (frametype == ROSE_CALL_REQUEST) 952 if ((dev = rose_dev_get(dest_addr)) != NULL) { 953 res = rose_rx_call_request(skb, dev, rose_neigh, lci); 954 dev_put(dev); 955 goto out; 956 } 957 958 if (!sysctl_rose_routing_control) { 959 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); 960 goto out; 961 } 962 963 /* 964 * Route it to the next in line if we have an entry for it. 965 */ 966 rose_route = rose_route_list; 967 while (rose_route != NULL) { 968 if (rose_route->lci1 == lci && 969 rose_route->neigh1 == rose_neigh) { 970 if (frametype == ROSE_CALL_REQUEST) { 971 /* F6FBB - Remove an existing unused route */ 972 rose_remove_route(rose_route); 973 break; 974 } else if (rose_route->neigh2 != NULL) { 975 skb->data[0] &= 0xF0; 976 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 977 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 978 rose_transmit_link(skb, rose_route->neigh2); 979 if (frametype == ROSE_CLEAR_CONFIRMATION) 980 rose_remove_route(rose_route); 981 res = 1; 982 goto out; 983 } else { 984 if (frametype == ROSE_CLEAR_CONFIRMATION) 985 rose_remove_route(rose_route); 986 goto out; 987 } 988 } 989 if (rose_route->lci2 == lci && 990 rose_route->neigh2 == rose_neigh) { 991 if (frametype == ROSE_CALL_REQUEST) { 992 /* F6FBB - Remove an existing unused route */ 993 rose_remove_route(rose_route); 994 break; 995 } else if (rose_route->neigh1 != NULL) { 996 skb->data[0] &= 0xF0; 997 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; 998 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; 999 rose_transmit_link(skb, rose_route->neigh1); 1000 if (frametype == ROSE_CLEAR_CONFIRMATION) 1001 rose_remove_route(rose_route); 1002 res = 1; 1003 goto out; 1004 } else { 1005 if (frametype == ROSE_CLEAR_CONFIRMATION) 1006 rose_remove_route(rose_route); 1007 goto out; 1008 } 1009 } 1010 rose_route = rose_route->next; 1011 } 1012 1013 /* 1014 * We know that: 1015 * 1. The frame isn't for us, 1016 * 2. It isn't "owned" by any existing route. 1017 */ 1018 if (frametype != ROSE_CALL_REQUEST) { /* XXX */ 1019 res = 0; 1020 goto out; 1021 } 1022 1023 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); 1024 1025 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, 1026 skb->len - ROSE_CALL_REQ_FACILITIES_OFF, 1027 &facilities)) { 1028 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); 1029 goto out; 1030 } 1031 1032 /* 1033 * Check for routing loops. 1034 */ 1035 rose_route = rose_route_list; 1036 while (rose_route != NULL) { 1037 if (rose_route->rand == facilities.rand && 1038 rosecmp(src_addr, &rose_route->src_addr) == 0 && 1039 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && 1040 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { 1041 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); 1042 goto out; 1043 } 1044 rose_route = rose_route->next; 1045 } 1046 1047 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { 1048 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); 1049 goto out; 1050 } 1051 1052 if ((new_lci = rose_new_lci(new_neigh)) == 0) { 1053 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); 1054 goto out; 1055 } 1056 1057 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { 1058 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); 1059 goto out; 1060 } 1061 1062 rose_route->lci1 = lci; 1063 rose_route->src_addr = *src_addr; 1064 rose_route->dest_addr = *dest_addr; 1065 rose_route->src_call = facilities.dest_call; 1066 rose_route->dest_call = facilities.source_call; 1067 rose_route->rand = facilities.rand; 1068 rose_route->neigh1 = rose_neigh; 1069 rose_route->lci2 = new_lci; 1070 rose_route->neigh2 = new_neigh; 1071 1072 rose_route->neigh1->use++; 1073 rose_route->neigh2->use++; 1074 1075 rose_route->next = rose_route_list; 1076 rose_route_list = rose_route; 1077 1078 skb->data[0] &= 0xF0; 1079 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 1080 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 1081 1082 rose_transmit_link(skb, rose_route->neigh2); 1083 res = 1; 1084 1085 out: 1086 spin_unlock_bh(&rose_route_list_lock); 1087 spin_unlock_bh(&rose_neigh_list_lock); 1088 1089 return res; 1090 } 1091 1092 #ifdef CONFIG_PROC_FS 1093 1094 static void *rose_node_start(struct seq_file *seq, loff_t *pos) 1095 __acquires(rose_node_list_lock) 1096 { 1097 struct rose_node *rose_node; 1098 int i = 1; 1099 1100 spin_lock_bh(&rose_node_list_lock); 1101 if (*pos == 0) 1102 return SEQ_START_TOKEN; 1103 1104 for (rose_node = rose_node_list; rose_node && i < *pos; 1105 rose_node = rose_node->next, ++i); 1106 1107 return (i == *pos) ? rose_node : NULL; 1108 } 1109 1110 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) 1111 { 1112 ++*pos; 1113 1114 return (v == SEQ_START_TOKEN) ? rose_node_list 1115 : ((struct rose_node *)v)->next; 1116 } 1117 1118 static void rose_node_stop(struct seq_file *seq, void *v) 1119 __releases(rose_node_list_lock) 1120 { 1121 spin_unlock_bh(&rose_node_list_lock); 1122 } 1123 1124 static int rose_node_show(struct seq_file *seq, void *v) 1125 { 1126 char rsbuf[11]; 1127 int i; 1128 1129 if (v == SEQ_START_TOKEN) 1130 seq_puts(seq, "address mask n neigh neigh neigh\n"); 1131 else { 1132 const struct rose_node *rose_node = v; 1133 seq_printf(seq, "%-10s %04d %d", 1134 rose2asc(rsbuf, &rose_node->address), 1135 rose_node->mask, 1136 rose_node->count); 1137 1138 for (i = 0; i < rose_node->count; i++) 1139 seq_printf(seq, " %05d", rose_node->neighbour[i]->number); 1140 1141 seq_puts(seq, "\n"); 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