1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * 4 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 5 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 6 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi) 7 */ 8 #include <linux/errno.h> 9 #include <linux/types.h> 10 #include <linux/socket.h> 11 #include <linux/in.h> 12 #include <linux/kernel.h> 13 #include <linux/timer.h> 14 #include <linux/string.h> 15 #include <linux/sockios.h> 16 #include <linux/net.h> 17 #include <linux/slab.h> 18 #include <net/ax25.h> 19 #include <linux/inet.h> 20 #include <linux/netdevice.h> 21 #include <net/arp.h> 22 #include <linux/if_arp.h> 23 #include <linux/skbuff.h> 24 #include <net/sock.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 <linux/spinlock.h> 33 #include <net/netrom.h> 34 #include <linux/seq_file.h> 35 #include <linux/export.h> 36 37 static unsigned int nr_neigh_no = 1; 38 39 static HLIST_HEAD(nr_node_list); 40 static DEFINE_SPINLOCK(nr_node_list_lock); 41 static HLIST_HEAD(nr_neigh_list); 42 static DEFINE_SPINLOCK(nr_neigh_list_lock); 43 44 static struct nr_node *nr_node_get(ax25_address *callsign) 45 { 46 struct nr_node *found = NULL; 47 struct nr_node *nr_node; 48 49 spin_lock_bh(&nr_node_list_lock); 50 nr_node_for_each(nr_node, &nr_node_list) 51 if (ax25cmp(callsign, &nr_node->callsign) == 0) { 52 nr_node_hold(nr_node); 53 found = nr_node; 54 break; 55 } 56 spin_unlock_bh(&nr_node_list_lock); 57 return found; 58 } 59 60 static struct nr_neigh *nr_neigh_get_dev(ax25_address *callsign, 61 struct net_device *dev) 62 { 63 struct nr_neigh *found = NULL; 64 struct nr_neigh *nr_neigh; 65 66 spin_lock_bh(&nr_neigh_list_lock); 67 nr_neigh_for_each(nr_neigh, &nr_neigh_list) 68 if (ax25cmp(callsign, &nr_neigh->callsign) == 0 && 69 nr_neigh->dev == dev) { 70 nr_neigh_hold(nr_neigh); 71 found = nr_neigh; 72 break; 73 } 74 spin_unlock_bh(&nr_neigh_list_lock); 75 return found; 76 } 77 78 static void nr_remove_neigh(struct nr_neigh *); 79 80 /* re-sort the routes in quality order. */ 81 static void re_sort_routes(struct nr_node *nr_node, int x, int y) 82 { 83 if (nr_node->routes[y].quality > nr_node->routes[x].quality) { 84 if (nr_node->which == x) 85 nr_node->which = y; 86 else if (nr_node->which == y) 87 nr_node->which = x; 88 89 swap(nr_node->routes[x], nr_node->routes[y]); 90 } 91 } 92 93 /* 94 * Add a new route to a node, and in the process add the node and the 95 * neighbour if it is new. 96 */ 97 static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic, 98 ax25_address *ax25, ax25_digi *ax25_digi, struct net_device *dev, 99 int quality, int obs_count) 100 { 101 struct nr_node *nr_node; 102 struct nr_neigh *nr_neigh; 103 int i, found; 104 struct net_device *odev; 105 106 if ((odev=nr_dev_get(nr)) != NULL) { /* Can't add routes to ourself */ 107 dev_put(odev); 108 return -EINVAL; 109 } 110 111 nr_node = nr_node_get(nr); 112 113 nr_neigh = nr_neigh_get_dev(ax25, dev); 114 115 /* 116 * The L2 link to a neighbour has failed in the past 117 * and now a frame comes from this neighbour. We assume 118 * it was a temporary trouble with the link and reset the 119 * routes now (and not wait for a node broadcast). 120 */ 121 if (nr_neigh != NULL && nr_neigh->failed != 0 && quality == 0) { 122 struct nr_node *nr_nodet; 123 124 spin_lock_bh(&nr_node_list_lock); 125 nr_node_for_each(nr_nodet, &nr_node_list) { 126 nr_node_lock(nr_nodet); 127 for (i = 0; i < nr_nodet->count; i++) 128 if (nr_nodet->routes[i].neighbour == nr_neigh) 129 if (i < nr_nodet->which) 130 nr_nodet->which = i; 131 nr_node_unlock(nr_nodet); 132 } 133 spin_unlock_bh(&nr_node_list_lock); 134 } 135 136 if (nr_neigh != NULL) 137 nr_neigh->failed = 0; 138 139 if (quality == 0 && nr_neigh != NULL && nr_node != NULL) { 140 nr_neigh_put(nr_neigh); 141 nr_node_put(nr_node); 142 return 0; 143 } 144 145 if (nr_neigh == NULL) { 146 if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) { 147 if (nr_node) 148 nr_node_put(nr_node); 149 return -ENOMEM; 150 } 151 152 nr_neigh->callsign = *ax25; 153 nr_neigh->digipeat = NULL; 154 nr_neigh->ax25 = NULL; 155 nr_neigh->dev = dev; 156 nr_neigh->quality = READ_ONCE(sysctl_netrom_default_path_quality); 157 nr_neigh->locked = 0; 158 nr_neigh->count = 0; 159 nr_neigh->number = nr_neigh_no++; 160 nr_neigh->failed = 0; 161 refcount_set(&nr_neigh->refcount, 1); 162 163 if (ax25_digi != NULL && ax25_digi->ndigi > 0) { 164 nr_neigh->digipeat = kmemdup(ax25_digi, 165 sizeof(*ax25_digi), 166 GFP_KERNEL); 167 if (nr_neigh->digipeat == NULL) { 168 kfree(nr_neigh); 169 if (nr_node) 170 nr_node_put(nr_node); 171 return -ENOMEM; 172 } 173 } 174 175 spin_lock_bh(&nr_neigh_list_lock); 176 hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list); 177 nr_neigh_hold(nr_neigh); 178 spin_unlock_bh(&nr_neigh_list_lock); 179 } 180 181 if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked) 182 nr_neigh->quality = quality; 183 184 if (nr_node == NULL) { 185 if ((nr_node = kmalloc(sizeof(*nr_node), GFP_ATOMIC)) == NULL) { 186 if (nr_neigh) 187 nr_neigh_put(nr_neigh); 188 return -ENOMEM; 189 } 190 191 nr_node->callsign = *nr; 192 strscpy(nr_node->mnemonic, mnemonic); 193 194 nr_node->which = 0; 195 nr_node->count = 1; 196 refcount_set(&nr_node->refcount, 1); 197 spin_lock_init(&nr_node->node_lock); 198 199 nr_node->routes[0].quality = quality; 200 nr_node->routes[0].obs_count = obs_count; 201 nr_node->routes[0].neighbour = nr_neigh; 202 203 nr_neigh_hold(nr_neigh); 204 nr_neigh->count++; 205 206 spin_lock_bh(&nr_node_list_lock); 207 hlist_add_head(&nr_node->node_node, &nr_node_list); 208 /* refcount initialized at 1 */ 209 spin_unlock_bh(&nr_node_list_lock); 210 211 nr_neigh_put(nr_neigh); 212 return 0; 213 } 214 nr_node_lock(nr_node); 215 216 if (quality != 0) 217 strscpy(nr_node->mnemonic, mnemonic); 218 219 for (found = 0, i = 0; i < nr_node->count; i++) { 220 if (nr_node->routes[i].neighbour == nr_neigh) { 221 nr_node->routes[i].quality = quality; 222 nr_node->routes[i].obs_count = obs_count; 223 found = 1; 224 break; 225 } 226 } 227 228 if (!found) { 229 /* We have space at the bottom, slot it in */ 230 if (nr_node->count < 3) { 231 nr_node->routes[2] = nr_node->routes[1]; 232 nr_node->routes[1] = nr_node->routes[0]; 233 234 nr_node->routes[0].quality = quality; 235 nr_node->routes[0].obs_count = obs_count; 236 nr_node->routes[0].neighbour = nr_neigh; 237 238 nr_node->which++; 239 nr_node->count++; 240 nr_neigh_hold(nr_neigh); 241 nr_neigh->count++; 242 } else { 243 /* It must be better than the worst */ 244 if (quality > nr_node->routes[2].quality) { 245 nr_node->routes[2].neighbour->count--; 246 nr_neigh_put(nr_node->routes[2].neighbour); 247 248 if (nr_node->routes[2].neighbour->count == 0 && !nr_node->routes[2].neighbour->locked) 249 nr_remove_neigh(nr_node->routes[2].neighbour); 250 251 nr_node->routes[2].quality = quality; 252 nr_node->routes[2].obs_count = obs_count; 253 nr_node->routes[2].neighbour = nr_neigh; 254 255 nr_neigh_hold(nr_neigh); 256 nr_neigh->count++; 257 } 258 } 259 } 260 261 /* Now re-sort the routes in quality order */ 262 switch (nr_node->count) { 263 case 3: 264 re_sort_routes(nr_node, 0, 1); 265 re_sort_routes(nr_node, 1, 2); 266 fallthrough; 267 case 2: 268 re_sort_routes(nr_node, 0, 1); 269 break; 270 case 1: 271 break; 272 } 273 274 for (i = 0; i < nr_node->count; i++) { 275 if (nr_node->routes[i].neighbour == nr_neigh) { 276 if (i < nr_node->which) 277 nr_node->which = i; 278 break; 279 } 280 } 281 282 nr_neigh_put(nr_neigh); 283 nr_node_unlock(nr_node); 284 nr_node_put(nr_node); 285 return 0; 286 } 287 288 static void nr_remove_node_locked(struct nr_node *nr_node) 289 { 290 lockdep_assert_held(&nr_node_list_lock); 291 292 hlist_del_init(&nr_node->node_node); 293 nr_node_put(nr_node); 294 } 295 296 static inline void __nr_remove_neigh(struct nr_neigh *nr_neigh) 297 { 298 hlist_del_init(&nr_neigh->neigh_node); 299 nr_neigh_put(nr_neigh); 300 } 301 302 #define nr_remove_neigh_locked(__neigh) \ 303 __nr_remove_neigh(__neigh) 304 305 static void nr_remove_neigh(struct nr_neigh *nr_neigh) 306 { 307 spin_lock_bh(&nr_neigh_list_lock); 308 __nr_remove_neigh(nr_neigh); 309 spin_unlock_bh(&nr_neigh_list_lock); 310 } 311 312 /* 313 * "Delete" a node. Strictly speaking remove a route to a node. The node 314 * is only deleted if no routes are left to it. 315 */ 316 static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev) 317 { 318 struct nr_node *nr_node; 319 struct nr_neigh *nr_neigh; 320 int i; 321 322 nr_node = nr_node_get(callsign); 323 324 if (nr_node == NULL) 325 return -EINVAL; 326 327 nr_neigh = nr_neigh_get_dev(neighbour, dev); 328 329 if (nr_neigh == NULL) { 330 nr_node_put(nr_node); 331 return -EINVAL; 332 } 333 334 spin_lock_bh(&nr_node_list_lock); 335 nr_node_lock(nr_node); 336 for (i = 0; i < nr_node->count; i++) { 337 if (nr_node->routes[i].neighbour == nr_neigh) { 338 nr_neigh->count--; 339 nr_neigh_put(nr_neigh); 340 341 if (nr_neigh->count == 0 && !nr_neigh->locked) 342 nr_remove_neigh(nr_neigh); 343 nr_neigh_put(nr_neigh); 344 345 nr_node->count--; 346 347 if (nr_node->count == 0) { 348 nr_remove_node_locked(nr_node); 349 } else { 350 switch (i) { 351 case 0: 352 nr_node->routes[0] = nr_node->routes[1]; 353 fallthrough; 354 case 1: 355 nr_node->routes[1] = nr_node->routes[2]; 356 fallthrough; 357 case 2: 358 break; 359 } 360 nr_node_put(nr_node); 361 } 362 nr_node_unlock(nr_node); 363 spin_unlock_bh(&nr_node_list_lock); 364 365 return 0; 366 } 367 } 368 nr_neigh_put(nr_neigh); 369 nr_node_unlock(nr_node); 370 spin_unlock_bh(&nr_node_list_lock); 371 nr_node_put(nr_node); 372 373 return -EINVAL; 374 } 375 376 /* 377 * Lock a neighbour with a quality. 378 */ 379 static int __must_check nr_add_neigh(ax25_address *callsign, 380 ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality) 381 { 382 struct nr_neigh *nr_neigh; 383 384 nr_neigh = nr_neigh_get_dev(callsign, dev); 385 if (nr_neigh) { 386 nr_neigh->quality = quality; 387 nr_neigh->locked = 1; 388 nr_neigh_put(nr_neigh); 389 return 0; 390 } 391 392 if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) 393 return -ENOMEM; 394 395 nr_neigh->callsign = *callsign; 396 nr_neigh->digipeat = NULL; 397 nr_neigh->ax25 = NULL; 398 nr_neigh->dev = dev; 399 nr_neigh->quality = quality; 400 nr_neigh->locked = 1; 401 nr_neigh->count = 0; 402 nr_neigh->number = nr_neigh_no++; 403 nr_neigh->failed = 0; 404 refcount_set(&nr_neigh->refcount, 1); 405 406 if (ax25_digi != NULL && ax25_digi->ndigi > 0) { 407 nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi), 408 GFP_KERNEL); 409 if (nr_neigh->digipeat == NULL) { 410 kfree(nr_neigh); 411 return -ENOMEM; 412 } 413 } 414 415 spin_lock_bh(&nr_neigh_list_lock); 416 hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list); 417 /* refcount is initialized at 1 */ 418 spin_unlock_bh(&nr_neigh_list_lock); 419 420 return 0; 421 } 422 423 /* 424 * "Delete" a neighbour. The neighbour is only removed if the number 425 * of nodes that may use it is zero. 426 */ 427 static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality) 428 { 429 struct nr_neigh *nr_neigh; 430 431 nr_neigh = nr_neigh_get_dev(callsign, dev); 432 433 if (nr_neigh == NULL) return -EINVAL; 434 435 nr_neigh->quality = quality; 436 nr_neigh->locked = 0; 437 438 if (nr_neigh->count == 0) 439 nr_remove_neigh(nr_neigh); 440 nr_neigh_put(nr_neigh); 441 442 return 0; 443 } 444 445 /* 446 * Decrement the obsolescence count by one. If a route is reduced to a 447 * count of zero, remove it. Also remove any unlocked neighbours with 448 * zero nodes routing via it. 449 */ 450 static int nr_dec_obs(void) 451 { 452 struct nr_neigh *nr_neigh; 453 struct nr_node *s; 454 struct hlist_node *nodet; 455 int i; 456 457 spin_lock_bh(&nr_node_list_lock); 458 nr_node_for_each_safe(s, nodet, &nr_node_list) { 459 nr_node_lock(s); 460 for (i = 0; i < s->count; i++) { 461 switch (s->routes[i].obs_count) { 462 case 0: /* A locked entry */ 463 break; 464 465 case 1: /* From 1 -> 0 */ 466 nr_neigh = s->routes[i].neighbour; 467 468 nr_neigh->count--; 469 nr_neigh_put(nr_neigh); 470 471 if (nr_neigh->count == 0 && !nr_neigh->locked) 472 nr_remove_neigh(nr_neigh); 473 474 s->count--; 475 476 switch (i) { 477 case 0: 478 s->routes[0] = s->routes[1]; 479 fallthrough; 480 case 1: 481 s->routes[1] = s->routes[2]; 482 break; 483 case 2: 484 break; 485 } 486 break; 487 488 default: 489 s->routes[i].obs_count--; 490 break; 491 492 } 493 } 494 495 if (s->count <= 0) 496 nr_remove_node_locked(s); 497 nr_node_unlock(s); 498 } 499 spin_unlock_bh(&nr_node_list_lock); 500 501 return 0; 502 } 503 504 /* 505 * A device has been removed. Remove its routes and neighbours. 506 */ 507 void nr_rt_device_down(struct net_device *dev) 508 { 509 struct nr_neigh *s; 510 struct hlist_node *nodet, *node2t; 511 struct nr_node *t; 512 int i; 513 514 spin_lock_bh(&nr_neigh_list_lock); 515 nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { 516 if (s->dev == dev) { 517 spin_lock_bh(&nr_node_list_lock); 518 nr_node_for_each_safe(t, node2t, &nr_node_list) { 519 nr_node_lock(t); 520 for (i = 0; i < t->count; i++) { 521 if (t->routes[i].neighbour == s) { 522 t->count--; 523 524 switch (i) { 525 case 0: 526 t->routes[0] = t->routes[1]; 527 fallthrough; 528 case 1: 529 t->routes[1] = t->routes[2]; 530 break; 531 case 2: 532 break; 533 } 534 } 535 } 536 537 if (t->count <= 0) 538 nr_remove_node_locked(t); 539 nr_node_unlock(t); 540 } 541 spin_unlock_bh(&nr_node_list_lock); 542 543 nr_remove_neigh_locked(s); 544 } 545 } 546 spin_unlock_bh(&nr_neigh_list_lock); 547 } 548 549 /* 550 * Check that the device given is a valid AX.25 interface that is "up". 551 * Or a valid ethernet interface with an AX.25 callsign binding. 552 */ 553 static struct net_device *nr_ax25_dev_get(char *devname) 554 { 555 struct net_device *dev; 556 557 if ((dev = dev_get_by_name(&init_net, devname)) == NULL) 558 return NULL; 559 560 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 561 return dev; 562 563 dev_put(dev); 564 return NULL; 565 } 566 567 /* 568 * Find the first active NET/ROM device, usually "nr0". 569 */ 570 struct net_device *nr_dev_first(void) 571 { 572 struct net_device *dev, *first = NULL; 573 574 rcu_read_lock(); 575 for_each_netdev_rcu(&init_net, dev) { 576 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM) 577 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 578 first = dev; 579 } 580 dev_hold(first); 581 rcu_read_unlock(); 582 583 return first; 584 } 585 586 /* 587 * Find the NET/ROM device for the given callsign. 588 */ 589 struct net_device *nr_dev_get(ax25_address *addr) 590 { 591 struct net_device *dev; 592 593 rcu_read_lock(); 594 for_each_netdev_rcu(&init_net, dev) { 595 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && 596 ax25cmp(addr, (const ax25_address *)dev->dev_addr) == 0) { 597 dev_hold(dev); 598 goto out; 599 } 600 } 601 dev = NULL; 602 out: 603 rcu_read_unlock(); 604 return dev; 605 } 606 607 static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis, 608 ax25_address *digipeaters) 609 { 610 int i; 611 612 if (ndigis == 0) 613 return NULL; 614 615 for (i = 0; i < ndigis; i++) { 616 digi->calls[i] = digipeaters[i]; 617 digi->repeated[i] = 0; 618 } 619 620 digi->ndigi = ndigis; 621 digi->lastrepeat = -1; 622 623 return digi; 624 } 625 626 /* 627 * Handle the ioctls that control the routing functions. 628 */ 629 int nr_rt_ioctl(unsigned int cmd, void __user *arg) 630 { 631 struct nr_route_struct nr_route; 632 struct net_device *dev; 633 ax25_digi digi; 634 int ret; 635 636 switch (cmd) { 637 case SIOCADDRT: 638 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) 639 return -EFAULT; 640 if (nr_route.ndigis > AX25_MAX_DIGIS) 641 return -EINVAL; 642 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) 643 return -EINVAL; 644 switch (nr_route.type) { 645 case NETROM_NODE: 646 if (strnlen(nr_route.mnemonic, 7) == 7) { 647 ret = -EINVAL; 648 break; 649 } 650 651 ret = nr_add_node(&nr_route.callsign, 652 nr_route.mnemonic, 653 &nr_route.neighbour, 654 nr_call_to_digi(&digi, nr_route.ndigis, 655 nr_route.digipeaters), 656 dev, nr_route.quality, 657 nr_route.obs_count); 658 break; 659 case NETROM_NEIGH: 660 ret = nr_add_neigh(&nr_route.callsign, 661 nr_call_to_digi(&digi, nr_route.ndigis, 662 nr_route.digipeaters), 663 dev, nr_route.quality); 664 break; 665 default: 666 ret = -EINVAL; 667 } 668 dev_put(dev); 669 return ret; 670 671 case SIOCDELRT: 672 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) 673 return -EFAULT; 674 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) 675 return -EINVAL; 676 switch (nr_route.type) { 677 case NETROM_NODE: 678 ret = nr_del_node(&nr_route.callsign, 679 &nr_route.neighbour, dev); 680 break; 681 case NETROM_NEIGH: 682 ret = nr_del_neigh(&nr_route.callsign, 683 dev, nr_route.quality); 684 break; 685 default: 686 ret = -EINVAL; 687 } 688 dev_put(dev); 689 return ret; 690 691 case SIOCNRDECOBS: 692 return nr_dec_obs(); 693 694 default: 695 return -EINVAL; 696 } 697 698 return 0; 699 } 700 701 /* 702 * A level 2 link has timed out, therefore it appears to be a poor link, 703 * then don't use that neighbour until it is reset. 704 */ 705 void nr_link_failed(ax25_cb *ax25, int reason) 706 { 707 struct nr_neigh *s, *nr_neigh = NULL; 708 struct nr_node *nr_node = NULL; 709 710 spin_lock_bh(&nr_neigh_list_lock); 711 nr_neigh_for_each(s, &nr_neigh_list) { 712 if (s->ax25 == ax25) { 713 nr_neigh_hold(s); 714 nr_neigh = s; 715 break; 716 } 717 } 718 spin_unlock_bh(&nr_neigh_list_lock); 719 720 if (nr_neigh == NULL) 721 return; 722 723 nr_neigh->ax25 = NULL; 724 ax25_cb_put(ax25); 725 726 if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) { 727 nr_neigh_put(nr_neigh); 728 return; 729 } 730 spin_lock_bh(&nr_node_list_lock); 731 nr_node_for_each(nr_node, &nr_node_list) { 732 nr_node_lock(nr_node); 733 if (nr_node->which < nr_node->count && 734 nr_node->routes[nr_node->which].neighbour == nr_neigh) 735 nr_node->which++; 736 nr_node_unlock(nr_node); 737 } 738 spin_unlock_bh(&nr_node_list_lock); 739 nr_neigh_put(nr_neigh); 740 } 741 742 /* 743 * Route a frame to an appropriate AX.25 connection. A NULL ax25_cb 744 * indicates an internally generated frame. 745 */ 746 int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25) 747 { 748 ax25_address *nr_src, *nr_dest; 749 struct nr_neigh *nr_neigh; 750 struct nr_node *nr_node; 751 struct net_device *dev; 752 unsigned char *dptr; 753 ax25_cb *ax25s; 754 int ret; 755 struct sk_buff *skbn; 756 757 758 nr_src = (ax25_address *)(skb->data + 0); 759 nr_dest = (ax25_address *)(skb->data + 7); 760 761 if (ax25 != NULL) { 762 ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat, 763 ax25->ax25_dev->dev, 0, 764 READ_ONCE(sysctl_netrom_obsolescence_count_initialiser)); 765 if (ret) 766 return ret; 767 } 768 769 if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */ 770 if (ax25 == NULL) /* Its from me */ 771 ret = nr_loopback_queue(skb); 772 else 773 ret = nr_rx_frame(skb, dev); 774 dev_put(dev); 775 return ret; 776 } 777 778 if (!READ_ONCE(sysctl_netrom_routing_control) && ax25 != NULL) 779 return 0; 780 781 /* Its Time-To-Live has expired */ 782 if (skb->data[14] == 1) { 783 return 0; 784 } 785 786 nr_node = nr_node_get(nr_dest); 787 if (nr_node == NULL) 788 return 0; 789 nr_node_lock(nr_node); 790 791 if (nr_node->which >= nr_node->count) { 792 nr_node_unlock(nr_node); 793 nr_node_put(nr_node); 794 return 0; 795 } 796 797 nr_neigh = nr_node->routes[nr_node->which].neighbour; 798 799 if ((dev = nr_dev_first()) == NULL) { 800 nr_node_unlock(nr_node); 801 nr_node_put(nr_node); 802 return 0; 803 } 804 805 /* We are going to change the netrom headers so we should get our 806 own skb, we also did not know until now how much header space 807 we had to reserve... - RXQ */ 808 if ((skbn=skb_copy_expand(skb, dev->hard_header_len, 0, GFP_ATOMIC)) == NULL) { 809 nr_node_unlock(nr_node); 810 nr_node_put(nr_node); 811 dev_put(dev); 812 return 0; 813 } 814 kfree_skb(skb); 815 skb=skbn; 816 skb->data[14]--; 817 818 dptr = skb_push(skb, 1); 819 *dptr = AX25_P_NETROM; 820 821 ax25s = nr_neigh->ax25; 822 nr_neigh->ax25 = ax25_send_frame(skb, 256, 823 (const ax25_address *)dev->dev_addr, 824 &nr_neigh->callsign, 825 nr_neigh->digipeat, nr_neigh->dev); 826 if (ax25s) 827 ax25_cb_put(ax25s); 828 829 dev_put(dev); 830 ret = (nr_neigh->ax25 != NULL); 831 nr_node_unlock(nr_node); 832 nr_node_put(nr_node); 833 834 return ret; 835 } 836 837 #ifdef CONFIG_PROC_FS 838 839 static void *nr_node_start(struct seq_file *seq, loff_t *pos) 840 __acquires(&nr_node_list_lock) 841 { 842 spin_lock_bh(&nr_node_list_lock); 843 return seq_hlist_start_head(&nr_node_list, *pos); 844 } 845 846 static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos) 847 { 848 return seq_hlist_next(v, &nr_node_list, pos); 849 } 850 851 static void nr_node_stop(struct seq_file *seq, void *v) 852 __releases(&nr_node_list_lock) 853 { 854 spin_unlock_bh(&nr_node_list_lock); 855 } 856 857 static int nr_node_show(struct seq_file *seq, void *v) 858 { 859 char buf[11]; 860 int i; 861 862 if (v == SEQ_START_TOKEN) 863 seq_puts(seq, 864 "callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n"); 865 else { 866 struct nr_node *nr_node = hlist_entry(v, struct nr_node, 867 node_node); 868 869 nr_node_lock(nr_node); 870 seq_printf(seq, "%-9s %-7s %d %d", 871 ax2asc(buf, &nr_node->callsign), 872 (nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic, 873 nr_node->which + 1, 874 nr_node->count); 875 876 for (i = 0; i < nr_node->count; i++) { 877 seq_printf(seq, " %3d %d %05d", 878 nr_node->routes[i].quality, 879 nr_node->routes[i].obs_count, 880 nr_node->routes[i].neighbour->number); 881 } 882 nr_node_unlock(nr_node); 883 884 seq_puts(seq, "\n"); 885 } 886 return 0; 887 } 888 889 const struct seq_operations nr_node_seqops = { 890 .start = nr_node_start, 891 .next = nr_node_next, 892 .stop = nr_node_stop, 893 .show = nr_node_show, 894 }; 895 896 static void *nr_neigh_start(struct seq_file *seq, loff_t *pos) 897 __acquires(&nr_neigh_list_lock) 898 { 899 spin_lock_bh(&nr_neigh_list_lock); 900 return seq_hlist_start_head(&nr_neigh_list, *pos); 901 } 902 903 static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 904 { 905 return seq_hlist_next(v, &nr_neigh_list, pos); 906 } 907 908 static void nr_neigh_stop(struct seq_file *seq, void *v) 909 __releases(&nr_neigh_list_lock) 910 { 911 spin_unlock_bh(&nr_neigh_list_lock); 912 } 913 914 static int nr_neigh_show(struct seq_file *seq, void *v) 915 { 916 char buf[11]; 917 int i; 918 919 if (v == SEQ_START_TOKEN) 920 seq_puts(seq, "addr callsign dev qual lock count failed digipeaters\n"); 921 else { 922 struct nr_neigh *nr_neigh; 923 924 nr_neigh = hlist_entry(v, struct nr_neigh, neigh_node); 925 seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d", 926 nr_neigh->number, 927 ax2asc(buf, &nr_neigh->callsign), 928 nr_neigh->dev ? nr_neigh->dev->name : "???", 929 nr_neigh->quality, 930 nr_neigh->locked, 931 nr_neigh->count, 932 nr_neigh->failed); 933 934 if (nr_neigh->digipeat != NULL) { 935 for (i = 0; i < nr_neigh->digipeat->ndigi; i++) 936 seq_printf(seq, " %s", 937 ax2asc(buf, &nr_neigh->digipeat->calls[i])); 938 } 939 940 seq_puts(seq, "\n"); 941 } 942 return 0; 943 } 944 945 const struct seq_operations nr_neigh_seqops = { 946 .start = nr_neigh_start, 947 .next = nr_neigh_next, 948 .stop = nr_neigh_stop, 949 .show = nr_neigh_show, 950 }; 951 #endif 952 953 /* 954 * Free all memory associated with the nodes and routes lists. 955 */ 956 void nr_rt_free(void) 957 { 958 struct nr_neigh *s = NULL; 959 struct nr_node *t = NULL; 960 struct hlist_node *nodet; 961 962 spin_lock_bh(&nr_neigh_list_lock); 963 spin_lock_bh(&nr_node_list_lock); 964 nr_node_for_each_safe(t, nodet, &nr_node_list) { 965 nr_node_lock(t); 966 nr_remove_node_locked(t); 967 nr_node_unlock(t); 968 } 969 nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { 970 while(s->count) { 971 s->count--; 972 nr_neigh_put(s); 973 } 974 nr_remove_neigh_locked(s); 975 } 976 spin_unlock_bh(&nr_node_list_lock); 977 spin_unlock_bh(&nr_neigh_list_lock); 978 } 979