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 rose_stop_ftimer(rose_neigh); 231 rose_stop_t0timer(rose_neigh); 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 /* fall through */ 347 case 1: 348 rose_node->neighbour[1] = 349 rose_node->neighbour[2]; 350 case 2: 351 break; 352 } 353 } 354 goto out; 355 } 356 } 357 err = -EINVAL; 358 359 out: 360 spin_unlock_bh(&rose_neigh_list_lock); 361 spin_unlock_bh(&rose_node_list_lock); 362 363 return err; 364 } 365 366 /* 367 * Add the loopback neighbour. 368 */ 369 void rose_add_loopback_neigh(void) 370 { 371 struct rose_neigh *sn; 372 373 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL); 374 if (!rose_loopback_neigh) 375 return; 376 sn = rose_loopback_neigh; 377 378 sn->callsign = null_ax25_address; 379 sn->digipeat = NULL; 380 sn->ax25 = NULL; 381 sn->dev = NULL; 382 sn->count = 0; 383 sn->use = 0; 384 sn->dce_mode = 1; 385 sn->loopback = 1; 386 sn->number = rose_neigh_no++; 387 sn->restarted = 1; 388 389 skb_queue_head_init(&sn->queue); 390 391 timer_setup(&sn->ftimer, NULL, 0); 392 timer_setup(&sn->t0timer, NULL, 0); 393 394 spin_lock_bh(&rose_neigh_list_lock); 395 sn->next = rose_neigh_list; 396 rose_neigh_list = sn; 397 spin_unlock_bh(&rose_neigh_list_lock); 398 } 399 400 /* 401 * Add a loopback node. 402 */ 403 int rose_add_loopback_node(rose_address *address) 404 { 405 struct rose_node *rose_node; 406 int err = 0; 407 408 spin_lock_bh(&rose_node_list_lock); 409 410 rose_node = rose_node_list; 411 while (rose_node != NULL) { 412 if ((rose_node->mask == 10) && 413 (rosecmpm(address, &rose_node->address, 10) == 0) && 414 rose_node->loopback) 415 break; 416 rose_node = rose_node->next; 417 } 418 419 if (rose_node != NULL) 420 goto out; 421 422 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) { 423 err = -ENOMEM; 424 goto out; 425 } 426 427 rose_node->address = *address; 428 rose_node->mask = 10; 429 rose_node->count = 1; 430 rose_node->loopback = 1; 431 rose_node->neighbour[0] = rose_loopback_neigh; 432 433 /* Insert at the head of list. Address is always mask=10 */ 434 rose_node->next = rose_node_list; 435 rose_node_list = rose_node; 436 437 rose_loopback_neigh->count++; 438 439 out: 440 spin_unlock_bh(&rose_node_list_lock); 441 442 return err; 443 } 444 445 /* 446 * Delete a loopback node. 447 */ 448 void rose_del_loopback_node(rose_address *address) 449 { 450 struct rose_node *rose_node; 451 452 spin_lock_bh(&rose_node_list_lock); 453 454 rose_node = rose_node_list; 455 while (rose_node != NULL) { 456 if ((rose_node->mask == 10) && 457 (rosecmpm(address, &rose_node->address, 10) == 0) && 458 rose_node->loopback) 459 break; 460 rose_node = rose_node->next; 461 } 462 463 if (rose_node == NULL) 464 goto out; 465 466 rose_remove_node(rose_node); 467 468 rose_loopback_neigh->count--; 469 470 out: 471 spin_unlock_bh(&rose_node_list_lock); 472 } 473 474 /* 475 * A device has been removed. Remove its routes and neighbours. 476 */ 477 void rose_rt_device_down(struct net_device *dev) 478 { 479 struct rose_neigh *s, *rose_neigh; 480 struct rose_node *t, *rose_node; 481 int i; 482 483 spin_lock_bh(&rose_node_list_lock); 484 spin_lock_bh(&rose_neigh_list_lock); 485 rose_neigh = rose_neigh_list; 486 while (rose_neigh != NULL) { 487 s = rose_neigh; 488 rose_neigh = rose_neigh->next; 489 490 if (s->dev != dev) 491 continue; 492 493 rose_node = rose_node_list; 494 495 while (rose_node != NULL) { 496 t = rose_node; 497 rose_node = rose_node->next; 498 499 for (i = 0; i < t->count; i++) { 500 if (t->neighbour[i] != s) 501 continue; 502 503 t->count--; 504 505 switch (i) { 506 case 0: 507 t->neighbour[0] = t->neighbour[1]; 508 /* fall through */ 509 case 1: 510 t->neighbour[1] = t->neighbour[2]; 511 case 2: 512 break; 513 } 514 } 515 516 if (t->count <= 0) 517 rose_remove_node(t); 518 } 519 520 rose_remove_neigh(s); 521 } 522 spin_unlock_bh(&rose_neigh_list_lock); 523 spin_unlock_bh(&rose_node_list_lock); 524 } 525 526 #if 0 /* Currently unused */ 527 /* 528 * A device has been removed. Remove its links. 529 */ 530 void rose_route_device_down(struct net_device *dev) 531 { 532 struct rose_route *s, *rose_route; 533 534 spin_lock_bh(&rose_route_list_lock); 535 rose_route = rose_route_list; 536 while (rose_route != NULL) { 537 s = rose_route; 538 rose_route = rose_route->next; 539 540 if (s->neigh1->dev == dev || s->neigh2->dev == dev) 541 rose_remove_route(s); 542 } 543 spin_unlock_bh(&rose_route_list_lock); 544 } 545 #endif 546 547 /* 548 * Clear all nodes and neighbours out, except for neighbours with 549 * active connections going through them. 550 * Do not clear loopback neighbour and nodes. 551 */ 552 static int rose_clear_routes(void) 553 { 554 struct rose_neigh *s, *rose_neigh; 555 struct rose_node *t, *rose_node; 556 557 spin_lock_bh(&rose_node_list_lock); 558 spin_lock_bh(&rose_neigh_list_lock); 559 560 rose_neigh = rose_neigh_list; 561 rose_node = rose_node_list; 562 563 while (rose_node != NULL) { 564 t = rose_node; 565 rose_node = rose_node->next; 566 if (!t->loopback) 567 rose_remove_node(t); 568 } 569 570 while (rose_neigh != NULL) { 571 s = rose_neigh; 572 rose_neigh = rose_neigh->next; 573 574 if (s->use == 0 && !s->loopback) { 575 s->count = 0; 576 rose_remove_neigh(s); 577 } 578 } 579 580 spin_unlock_bh(&rose_neigh_list_lock); 581 spin_unlock_bh(&rose_node_list_lock); 582 583 return 0; 584 } 585 586 /* 587 * Check that the device given is a valid AX.25 interface that is "up". 588 * called with RTNL 589 */ 590 static struct net_device *rose_ax25_dev_find(char *devname) 591 { 592 struct net_device *dev; 593 594 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL) 595 return NULL; 596 597 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 598 return dev; 599 600 return NULL; 601 } 602 603 /* 604 * Find the first active ROSE device, usually "rose0". 605 */ 606 struct net_device *rose_dev_first(void) 607 { 608 struct net_device *dev, *first = NULL; 609 610 rcu_read_lock(); 611 for_each_netdev_rcu(&init_net, dev) { 612 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE) 613 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 614 first = dev; 615 } 616 rcu_read_unlock(); 617 618 return first; 619 } 620 621 /* 622 * Find the ROSE device for the given address. 623 */ 624 struct net_device *rose_dev_get(rose_address *addr) 625 { 626 struct net_device *dev; 627 628 rcu_read_lock(); 629 for_each_netdev_rcu(&init_net, dev) { 630 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) { 631 dev_hold(dev); 632 goto out; 633 } 634 } 635 dev = NULL; 636 out: 637 rcu_read_unlock(); 638 return dev; 639 } 640 641 static int rose_dev_exists(rose_address *addr) 642 { 643 struct net_device *dev; 644 645 rcu_read_lock(); 646 for_each_netdev_rcu(&init_net, dev) { 647 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) 648 goto out; 649 } 650 dev = NULL; 651 out: 652 rcu_read_unlock(); 653 return dev != NULL; 654 } 655 656 657 658 659 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) 660 { 661 struct rose_route *rose_route; 662 663 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) 664 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || 665 (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) 666 return rose_route; 667 668 return NULL; 669 } 670 671 /* 672 * Find a neighbour or a route given a ROSE address. 673 */ 674 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, 675 unsigned char *diagnostic, int route_frame) 676 { 677 struct rose_neigh *res = NULL; 678 struct rose_node *node; 679 int failed = 0; 680 int i; 681 682 if (!route_frame) spin_lock_bh(&rose_node_list_lock); 683 for (node = rose_node_list; node != NULL; node = node->next) { 684 if (rosecmpm(addr, &node->address, node->mask) == 0) { 685 for (i = 0; i < node->count; i++) { 686 if (node->neighbour[i]->restarted) { 687 res = node->neighbour[i]; 688 goto out; 689 } 690 } 691 } 692 } 693 if (!route_frame) { /* connect request */ 694 for (node = rose_node_list; node != NULL; node = node->next) { 695 if (rosecmpm(addr, &node->address, node->mask) == 0) { 696 for (i = 0; i < node->count; i++) { 697 if (!rose_ftimer_running(node->neighbour[i])) { 698 res = node->neighbour[i]; 699 failed = 0; 700 goto out; 701 } 702 failed = 1; 703 } 704 } 705 } 706 } 707 708 if (failed) { 709 *cause = ROSE_OUT_OF_ORDER; 710 *diagnostic = 0; 711 } else { 712 *cause = ROSE_NOT_OBTAINABLE; 713 *diagnostic = 0; 714 } 715 716 out: 717 if (!route_frame) spin_unlock_bh(&rose_node_list_lock); 718 return res; 719 } 720 721 /* 722 * Handle the ioctls that control the routing functions. 723 */ 724 int rose_rt_ioctl(unsigned int cmd, void __user *arg) 725 { 726 struct rose_route_struct rose_route; 727 struct net_device *dev; 728 int err; 729 730 switch (cmd) { 731 case SIOCADDRT: 732 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 733 return -EFAULT; 734 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 735 return -EINVAL; 736 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ 737 return -EINVAL; 738 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ 739 return -EINVAL; 740 if (rose_route.ndigis > AX25_MAX_DIGIS) 741 return -EINVAL; 742 err = rose_add_node(&rose_route, dev); 743 return err; 744 745 case SIOCDELRT: 746 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) 747 return -EFAULT; 748 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) 749 return -EINVAL; 750 err = rose_del_node(&rose_route, dev); 751 return err; 752 753 case SIOCRSCLRRT: 754 return rose_clear_routes(); 755 756 default: 757 return -EINVAL; 758 } 759 760 return 0; 761 } 762 763 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) 764 { 765 struct rose_route *rose_route, *s; 766 767 rose_neigh->restarted = 0; 768 769 rose_stop_t0timer(rose_neigh); 770 rose_start_ftimer(rose_neigh); 771 772 skb_queue_purge(&rose_neigh->queue); 773 774 spin_lock_bh(&rose_route_list_lock); 775 776 rose_route = rose_route_list; 777 778 while (rose_route != NULL) { 779 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || 780 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || 781 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { 782 s = rose_route->next; 783 rose_remove_route(rose_route); 784 rose_route = s; 785 continue; 786 } 787 788 if (rose_route->neigh1 == rose_neigh) { 789 rose_route->neigh1->use--; 790 rose_route->neigh1 = NULL; 791 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); 792 } 793 794 if (rose_route->neigh2 == rose_neigh) { 795 rose_route->neigh2->use--; 796 rose_route->neigh2 = NULL; 797 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); 798 } 799 800 rose_route = rose_route->next; 801 } 802 spin_unlock_bh(&rose_route_list_lock); 803 } 804 805 /* 806 * A level 2 link has timed out, therefore it appears to be a poor link, 807 * then don't use that neighbour until it is reset. Blow away all through 808 * routes and connections using this route. 809 */ 810 void rose_link_failed(ax25_cb *ax25, int reason) 811 { 812 struct rose_neigh *rose_neigh; 813 814 spin_lock_bh(&rose_neigh_list_lock); 815 rose_neigh = rose_neigh_list; 816 while (rose_neigh != NULL) { 817 if (rose_neigh->ax25 == ax25) 818 break; 819 rose_neigh = rose_neigh->next; 820 } 821 822 if (rose_neigh != NULL) { 823 rose_neigh->ax25 = NULL; 824 ax25_cb_put(ax25); 825 826 rose_del_route_by_neigh(rose_neigh); 827 rose_kill_by_neigh(rose_neigh); 828 } 829 spin_unlock_bh(&rose_neigh_list_lock); 830 } 831 832 /* 833 * A device has been "downed" remove its link status. Blow away all 834 * through routes and connections that use this device. 835 */ 836 void rose_link_device_down(struct net_device *dev) 837 { 838 struct rose_neigh *rose_neigh; 839 840 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { 841 if (rose_neigh->dev == dev) { 842 rose_del_route_by_neigh(rose_neigh); 843 rose_kill_by_neigh(rose_neigh); 844 } 845 } 846 } 847 848 /* 849 * Route a frame to an appropriate AX.25 connection. 850 * A NULL ax25_cb indicates an internally generated frame. 851 */ 852 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) 853 { 854 struct rose_neigh *rose_neigh, *new_neigh; 855 struct rose_route *rose_route; 856 struct rose_facilities_struct facilities; 857 rose_address *src_addr, *dest_addr; 858 struct sock *sk; 859 unsigned short frametype; 860 unsigned int lci, new_lci; 861 unsigned char cause, diagnostic; 862 struct net_device *dev; 863 int res = 0; 864 char buf[11]; 865 866 if (skb->len < ROSE_MIN_LEN) 867 return res; 868 869 if (!ax25) 870 return rose_loopback_queue(skb, NULL); 871 872 frametype = skb->data[2]; 873 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); 874 if (frametype == ROSE_CALL_REQUEST && 875 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || 876 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != 877 ROSE_CALL_REQ_ADDR_LEN_VAL)) 878 return res; 879 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); 880 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); 881 882 spin_lock_bh(&rose_neigh_list_lock); 883 spin_lock_bh(&rose_route_list_lock); 884 885 rose_neigh = rose_neigh_list; 886 while (rose_neigh != NULL) { 887 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && 888 ax25->ax25_dev->dev == rose_neigh->dev) 889 break; 890 rose_neigh = rose_neigh->next; 891 } 892 893 if (rose_neigh == NULL) { 894 printk("rose_route : unknown neighbour or device %s\n", 895 ax2asc(buf, &ax25->dest_addr)); 896 goto out; 897 } 898 899 /* 900 * Obviously the link is working, halt the ftimer. 901 */ 902 rose_stop_ftimer(rose_neigh); 903 904 /* 905 * LCI of zero is always for us, and its always a restart 906 * frame. 907 */ 908 if (lci == 0) { 909 rose_link_rx_restart(skb, rose_neigh, frametype); 910 goto out; 911 } 912 913 /* 914 * Find an existing socket. 915 */ 916 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { 917 if (frametype == ROSE_CALL_REQUEST) { 918 struct rose_sock *rose = rose_sk(sk); 919 920 /* Remove an existing unused socket */ 921 rose_clear_queues(sk); 922 rose->cause = ROSE_NETWORK_CONGESTION; 923 rose->diagnostic = 0; 924 rose->neighbour->use--; 925 rose->neighbour = NULL; 926 rose->lci = 0; 927 rose->state = ROSE_STATE_0; 928 sk->sk_state = TCP_CLOSE; 929 sk->sk_err = 0; 930 sk->sk_shutdown |= SEND_SHUTDOWN; 931 if (!sock_flag(sk, SOCK_DEAD)) { 932 sk->sk_state_change(sk); 933 sock_set_flag(sk, SOCK_DEAD); 934 } 935 } 936 else { 937 skb_reset_transport_header(skb); 938 res = rose_process_rx_frame(sk, skb); 939 goto out; 940 } 941 } 942 943 /* 944 * Is is a Call Request and is it for us ? 945 */ 946 if (frametype == ROSE_CALL_REQUEST) 947 if ((dev = rose_dev_get(dest_addr)) != NULL) { 948 res = rose_rx_call_request(skb, dev, rose_neigh, lci); 949 dev_put(dev); 950 goto out; 951 } 952 953 if (!sysctl_rose_routing_control) { 954 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); 955 goto out; 956 } 957 958 /* 959 * Route it to the next in line if we have an entry for it. 960 */ 961 rose_route = rose_route_list; 962 while (rose_route != NULL) { 963 if (rose_route->lci1 == lci && 964 rose_route->neigh1 == rose_neigh) { 965 if (frametype == ROSE_CALL_REQUEST) { 966 /* F6FBB - Remove an existing unused route */ 967 rose_remove_route(rose_route); 968 break; 969 } else if (rose_route->neigh2 != NULL) { 970 skb->data[0] &= 0xF0; 971 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 972 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 973 rose_transmit_link(skb, rose_route->neigh2); 974 if (frametype == ROSE_CLEAR_CONFIRMATION) 975 rose_remove_route(rose_route); 976 res = 1; 977 goto out; 978 } else { 979 if (frametype == ROSE_CLEAR_CONFIRMATION) 980 rose_remove_route(rose_route); 981 goto out; 982 } 983 } 984 if (rose_route->lci2 == lci && 985 rose_route->neigh2 == rose_neigh) { 986 if (frametype == ROSE_CALL_REQUEST) { 987 /* F6FBB - Remove an existing unused route */ 988 rose_remove_route(rose_route); 989 break; 990 } else if (rose_route->neigh1 != NULL) { 991 skb->data[0] &= 0xF0; 992 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; 993 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; 994 rose_transmit_link(skb, rose_route->neigh1); 995 if (frametype == ROSE_CLEAR_CONFIRMATION) 996 rose_remove_route(rose_route); 997 res = 1; 998 goto out; 999 } else { 1000 if (frametype == ROSE_CLEAR_CONFIRMATION) 1001 rose_remove_route(rose_route); 1002 goto out; 1003 } 1004 } 1005 rose_route = rose_route->next; 1006 } 1007 1008 /* 1009 * We know that: 1010 * 1. The frame isn't for us, 1011 * 2. It isn't "owned" by any existing route. 1012 */ 1013 if (frametype != ROSE_CALL_REQUEST) { /* XXX */ 1014 res = 0; 1015 goto out; 1016 } 1017 1018 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); 1019 1020 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, 1021 skb->len - ROSE_CALL_REQ_FACILITIES_OFF, 1022 &facilities)) { 1023 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); 1024 goto out; 1025 } 1026 1027 /* 1028 * Check for routing loops. 1029 */ 1030 rose_route = rose_route_list; 1031 while (rose_route != NULL) { 1032 if (rose_route->rand == facilities.rand && 1033 rosecmp(src_addr, &rose_route->src_addr) == 0 && 1034 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && 1035 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { 1036 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); 1037 goto out; 1038 } 1039 rose_route = rose_route->next; 1040 } 1041 1042 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { 1043 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); 1044 goto out; 1045 } 1046 1047 if ((new_lci = rose_new_lci(new_neigh)) == 0) { 1048 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); 1049 goto out; 1050 } 1051 1052 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { 1053 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); 1054 goto out; 1055 } 1056 1057 rose_route->lci1 = lci; 1058 rose_route->src_addr = *src_addr; 1059 rose_route->dest_addr = *dest_addr; 1060 rose_route->src_call = facilities.dest_call; 1061 rose_route->dest_call = facilities.source_call; 1062 rose_route->rand = facilities.rand; 1063 rose_route->neigh1 = rose_neigh; 1064 rose_route->lci2 = new_lci; 1065 rose_route->neigh2 = new_neigh; 1066 1067 rose_route->neigh1->use++; 1068 rose_route->neigh2->use++; 1069 1070 rose_route->next = rose_route_list; 1071 rose_route_list = rose_route; 1072 1073 skb->data[0] &= 0xF0; 1074 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; 1075 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; 1076 1077 rose_transmit_link(skb, rose_route->neigh2); 1078 res = 1; 1079 1080 out: 1081 spin_unlock_bh(&rose_route_list_lock); 1082 spin_unlock_bh(&rose_neigh_list_lock); 1083 1084 return res; 1085 } 1086 1087 #ifdef CONFIG_PROC_FS 1088 1089 static void *rose_node_start(struct seq_file *seq, loff_t *pos) 1090 __acquires(rose_node_list_lock) 1091 { 1092 struct rose_node *rose_node; 1093 int i = 1; 1094 1095 spin_lock_bh(&rose_node_list_lock); 1096 if (*pos == 0) 1097 return SEQ_START_TOKEN; 1098 1099 for (rose_node = rose_node_list; rose_node && i < *pos; 1100 rose_node = rose_node->next, ++i); 1101 1102 return (i == *pos) ? rose_node : NULL; 1103 } 1104 1105 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) 1106 { 1107 ++*pos; 1108 1109 return (v == SEQ_START_TOKEN) ? rose_node_list 1110 : ((struct rose_node *)v)->next; 1111 } 1112 1113 static void rose_node_stop(struct seq_file *seq, void *v) 1114 __releases(rose_node_list_lock) 1115 { 1116 spin_unlock_bh(&rose_node_list_lock); 1117 } 1118 1119 static int rose_node_show(struct seq_file *seq, void *v) 1120 { 1121 char rsbuf[11]; 1122 int i; 1123 1124 if (v == SEQ_START_TOKEN) 1125 seq_puts(seq, "address mask n neigh neigh neigh\n"); 1126 else { 1127 const struct rose_node *rose_node = v; 1128 /* if (rose_node->loopback) { 1129 seq_printf(seq, "%-10s %04d 1 loopback\n", 1130 rose2asc(rsbuf, &rose_node->address), 1131 rose_node->mask); 1132 } else { */ 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", 1140 rose_node->neighbour[i]->number); 1141 1142 seq_puts(seq, "\n"); 1143 /* } */ 1144 } 1145 return 0; 1146 } 1147 1148 const struct seq_operations rose_node_seqops = { 1149 .start = rose_node_start, 1150 .next = rose_node_next, 1151 .stop = rose_node_stop, 1152 .show = rose_node_show, 1153 }; 1154 1155 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos) 1156 __acquires(rose_neigh_list_lock) 1157 { 1158 struct rose_neigh *rose_neigh; 1159 int i = 1; 1160 1161 spin_lock_bh(&rose_neigh_list_lock); 1162 if (*pos == 0) 1163 return SEQ_START_TOKEN; 1164 1165 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos; 1166 rose_neigh = rose_neigh->next, ++i); 1167 1168 return (i == *pos) ? rose_neigh : NULL; 1169 } 1170 1171 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 1172 { 1173 ++*pos; 1174 1175 return (v == SEQ_START_TOKEN) ? rose_neigh_list 1176 : ((struct rose_neigh *)v)->next; 1177 } 1178 1179 static void rose_neigh_stop(struct seq_file *seq, void *v) 1180 __releases(rose_neigh_list_lock) 1181 { 1182 spin_unlock_bh(&rose_neigh_list_lock); 1183 } 1184 1185 static int rose_neigh_show(struct seq_file *seq, void *v) 1186 { 1187 char buf[11]; 1188 int i; 1189 1190 if (v == SEQ_START_TOKEN) 1191 seq_puts(seq, 1192 "addr callsign dev count use mode restart t0 tf digipeaters\n"); 1193 else { 1194 struct rose_neigh *rose_neigh = v; 1195 1196 /* if (!rose_neigh->loopback) { */ 1197 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu", 1198 rose_neigh->number, 1199 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign), 1200 rose_neigh->dev ? rose_neigh->dev->name : "???", 1201 rose_neigh->count, 1202 rose_neigh->use, 1203 (rose_neigh->dce_mode) ? "DCE" : "DTE", 1204 (rose_neigh->restarted) ? "yes" : "no", 1205 ax25_display_timer(&rose_neigh->t0timer) / HZ, 1206 ax25_display_timer(&rose_neigh->ftimer) / HZ); 1207 1208 if (rose_neigh->digipeat != NULL) { 1209 for (i = 0; i < rose_neigh->digipeat->ndigi; i++) 1210 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i])); 1211 } 1212 1213 seq_puts(seq, "\n"); 1214 } 1215 return 0; 1216 } 1217 1218 1219 const struct seq_operations rose_neigh_seqops = { 1220 .start = rose_neigh_start, 1221 .next = rose_neigh_next, 1222 .stop = rose_neigh_stop, 1223 .show = rose_neigh_show, 1224 }; 1225 1226 static void *rose_route_start(struct seq_file *seq, loff_t *pos) 1227 __acquires(rose_route_list_lock) 1228 { 1229 struct rose_route *rose_route; 1230 int i = 1; 1231 1232 spin_lock_bh(&rose_route_list_lock); 1233 if (*pos == 0) 1234 return SEQ_START_TOKEN; 1235 1236 for (rose_route = rose_route_list; rose_route && i < *pos; 1237 rose_route = rose_route->next, ++i); 1238 1239 return (i == *pos) ? rose_route : NULL; 1240 } 1241 1242 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos) 1243 { 1244 ++*pos; 1245 1246 return (v == SEQ_START_TOKEN) ? rose_route_list 1247 : ((struct rose_route *)v)->next; 1248 } 1249 1250 static void rose_route_stop(struct seq_file *seq, void *v) 1251 __releases(rose_route_list_lock) 1252 { 1253 spin_unlock_bh(&rose_route_list_lock); 1254 } 1255 1256 static int rose_route_show(struct seq_file *seq, void *v) 1257 { 1258 char buf[11], rsbuf[11]; 1259 1260 if (v == SEQ_START_TOKEN) 1261 seq_puts(seq, 1262 "lci address callsign neigh <-> lci address callsign neigh\n"); 1263 else { 1264 struct rose_route *rose_route = v; 1265 1266 if (rose_route->neigh1) 1267 seq_printf(seq, 1268 "%3.3X %-10s %-9s %05d ", 1269 rose_route->lci1, 1270 rose2asc(rsbuf, &rose_route->src_addr), 1271 ax2asc(buf, &rose_route->src_call), 1272 rose_route->neigh1->number); 1273 else 1274 seq_puts(seq, 1275 "000 * * 00000 "); 1276 1277 if (rose_route->neigh2) 1278 seq_printf(seq, 1279 "%3.3X %-10s %-9s %05d\n", 1280 rose_route->lci2, 1281 rose2asc(rsbuf, &rose_route->dest_addr), 1282 ax2asc(buf, &rose_route->dest_call), 1283 rose_route->neigh2->number); 1284 else 1285 seq_puts(seq, 1286 "000 * * 00000\n"); 1287 } 1288 return 0; 1289 } 1290 1291 struct seq_operations rose_route_seqops = { 1292 .start = rose_route_start, 1293 .next = rose_route_next, 1294 .stop = rose_route_stop, 1295 .show = rose_route_show, 1296 }; 1297 #endif /* CONFIG_PROC_FS */ 1298 1299 /* 1300 * Release all memory associated with ROSE routing structures. 1301 */ 1302 void __exit rose_rt_free(void) 1303 { 1304 struct rose_neigh *s, *rose_neigh = rose_neigh_list; 1305 struct rose_node *t, *rose_node = rose_node_list; 1306 struct rose_route *u, *rose_route = rose_route_list; 1307 1308 while (rose_neigh != NULL) { 1309 s = rose_neigh; 1310 rose_neigh = rose_neigh->next; 1311 1312 rose_remove_neigh(s); 1313 } 1314 1315 while (rose_node != NULL) { 1316 t = rose_node; 1317 rose_node = rose_node->next; 1318 1319 rose_remove_node(t); 1320 } 1321 1322 while (rose_route != NULL) { 1323 u = rose_route; 1324 rose_route = rose_route->next; 1325 1326 rose_remove_route(u); 1327 } 1328 } 1329