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 37static unsigned int nr_neigh_no = 1; 38 39static HLIST_HEAD(nr_node_list); 40static DEFINE_SPINLOCK(nr_node_list_lock); 41static HLIST_HEAD(nr_neigh_list); 42static DEFINE_SPINLOCK(nr_neigh_list_lock); 43 44static 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 60static 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 78static void nr_remove_neigh(struct nr_neigh *); 79 80/* re-sort the routes in quality order. */ 81static 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 */ 97static 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 strcpy(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 strcpy(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 288static inline void __nr_remove_node(struct nr_node *nr_node) 289{ 290 hlist_del_init(&nr_node->node_node); 291 nr_node_put(nr_node); 292} 293 294#define nr_remove_node_locked(__node) \ 295 __nr_remove_node(__node) 296 297static void nr_remove_node(struct nr_node *nr_node) 298{ 299 spin_lock_bh(&nr_node_list_lock); 300 __nr_remove_node(nr_node); 301 spin_unlock_bh(&nr_node_list_lock); 302} 303 304static inline void __nr_remove_neigh(struct nr_neigh *nr_neigh) 305{ 306 hlist_del_init(&nr_neigh->neigh_node); 307 nr_neigh_put(nr_neigh); 308} 309 310#define nr_remove_neigh_locked(__neigh) \ 311 __nr_remove_neigh(__neigh) 312 313static void nr_remove_neigh(struct nr_neigh *nr_neigh) 314{ 315 spin_lock_bh(&nr_neigh_list_lock); 316 __nr_remove_neigh(nr_neigh); 317 spin_unlock_bh(&nr_neigh_list_lock); 318} 319 320/* 321 * "Delete" a node. Strictly speaking remove a route to a node. The node 322 * is only deleted if no routes are left to it. 323 */ 324static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev) 325{ 326 struct nr_node *nr_node; 327 struct nr_neigh *nr_neigh; 328 int i; 329 330 nr_node = nr_node_get(callsign); 331 332 if (nr_node == NULL) 333 return -EINVAL; 334 335 nr_neigh = nr_neigh_get_dev(neighbour, dev); 336 337 if (nr_neigh == NULL) { 338 nr_node_put(nr_node); 339 return -EINVAL; 340 } 341 342 nr_node_lock(nr_node); 343 for (i = 0; i < nr_node->count; i++) { 344 if (nr_node->routes[i].neighbour == nr_neigh) { 345 nr_neigh->count--; 346 nr_neigh_put(nr_neigh); 347 348 if (nr_neigh->count == 0 && !nr_neigh->locked) 349 nr_remove_neigh(nr_neigh); 350 nr_neigh_put(nr_neigh); 351 352 nr_node->count--; 353 354 if (nr_node->count == 0) { 355 nr_remove_node(nr_node); 356 } else { 357 switch (i) { 358 case 0: 359 nr_node->routes[0] = nr_node->routes[1]; 360 fallthrough; 361 case 1: 362 nr_node->routes[1] = nr_node->routes[2]; 363 fallthrough; 364 case 2: 365 break; 366 } 367 nr_node_put(nr_node); 368 } 369 nr_node_unlock(nr_node); 370 371 return 0; 372 } 373 } 374 nr_neigh_put(nr_neigh); 375 nr_node_unlock(nr_node); 376 nr_node_put(nr_node); 377 378 return -EINVAL; 379} 380 381/* 382 * Lock a neighbour with a quality. 383 */ 384static int __must_check nr_add_neigh(ax25_address *callsign, 385 ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality) 386{ 387 struct nr_neigh *nr_neigh; 388 389 nr_neigh = nr_neigh_get_dev(callsign, dev); 390 if (nr_neigh) { 391 nr_neigh->quality = quality; 392 nr_neigh->locked = 1; 393 nr_neigh_put(nr_neigh); 394 return 0; 395 } 396 397 if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) 398 return -ENOMEM; 399 400 nr_neigh->callsign = *callsign; 401 nr_neigh->digipeat = NULL; 402 nr_neigh->ax25 = NULL; 403 nr_neigh->dev = dev; 404 nr_neigh->quality = quality; 405 nr_neigh->locked = 1; 406 nr_neigh->count = 0; 407 nr_neigh->number = nr_neigh_no++; 408 nr_neigh->failed = 0; 409 refcount_set(&nr_neigh->refcount, 1); 410 411 if (ax25_digi != NULL && ax25_digi->ndigi > 0) { 412 nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi), 413 GFP_KERNEL); 414 if (nr_neigh->digipeat == NULL) { 415 kfree(nr_neigh); 416 return -ENOMEM; 417 } 418 } 419 420 spin_lock_bh(&nr_neigh_list_lock); 421 hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list); 422 /* refcount is initialized at 1 */ 423 spin_unlock_bh(&nr_neigh_list_lock); 424 425 return 0; 426} 427 428/* 429 * "Delete" a neighbour. The neighbour is only removed if the number 430 * of nodes that may use it is zero. 431 */ 432static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality) 433{ 434 struct nr_neigh *nr_neigh; 435 436 nr_neigh = nr_neigh_get_dev(callsign, dev); 437 438 if (nr_neigh == NULL) return -EINVAL; 439 440 nr_neigh->quality = quality; 441 nr_neigh->locked = 0; 442 443 if (nr_neigh->count == 0) 444 nr_remove_neigh(nr_neigh); 445 nr_neigh_put(nr_neigh); 446 447 return 0; 448} 449 450/* 451 * Decrement the obsolescence count by one. If a route is reduced to a 452 * count of zero, remove it. Also remove any unlocked neighbours with 453 * zero nodes routing via it. 454 */ 455static int nr_dec_obs(void) 456{ 457 struct nr_neigh *nr_neigh; 458 struct nr_node *s; 459 struct hlist_node *nodet; 460 int i; 461 462 spin_lock_bh(&nr_node_list_lock); 463 nr_node_for_each_safe(s, nodet, &nr_node_list) { 464 nr_node_lock(s); 465 for (i = 0; i < s->count; i++) { 466 switch (s->routes[i].obs_count) { 467 case 0: /* A locked entry */ 468 break; 469 470 case 1: /* From 1 -> 0 */ 471 nr_neigh = s->routes[i].neighbour; 472 473 nr_neigh->count--; 474 nr_neigh_put(nr_neigh); 475 476 if (nr_neigh->count == 0 && !nr_neigh->locked) 477 nr_remove_neigh(nr_neigh); 478 479 s->count--; 480 481 switch (i) { 482 case 0: 483 s->routes[0] = s->routes[1]; 484 fallthrough; 485 case 1: 486 s->routes[1] = s->routes[2]; 487 break; 488 case 2: 489 break; 490 } 491 break; 492 493 default: 494 s->routes[i].obs_count--; 495 break; 496 497 } 498 } 499 500 if (s->count <= 0) 501 nr_remove_node_locked(s); 502 nr_node_unlock(s); 503 } 504 spin_unlock_bh(&nr_node_list_lock); 505 506 return 0; 507} 508 509/* 510 * A device has been removed. Remove its routes and neighbours. 511 */ 512void nr_rt_device_down(struct net_device *dev) 513{ 514 struct nr_neigh *s; 515 struct hlist_node *nodet, *node2t; 516 struct nr_node *t; 517 int i; 518 519 spin_lock_bh(&nr_neigh_list_lock); 520 nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { 521 if (s->dev == dev) { 522 spin_lock_bh(&nr_node_list_lock); 523 nr_node_for_each_safe(t, node2t, &nr_node_list) { 524 nr_node_lock(t); 525 for (i = 0; i < t->count; i++) { 526 if (t->routes[i].neighbour == s) { 527 t->count--; 528 529 switch (i) { 530 case 0: 531 t->routes[0] = t->routes[1]; 532 fallthrough; 533 case 1: 534 t->routes[1] = t->routes[2]; 535 break; 536 case 2: 537 break; 538 } 539 } 540 } 541 542 if (t->count <= 0) 543 nr_remove_node_locked(t); 544 nr_node_unlock(t); 545 } 546 spin_unlock_bh(&nr_node_list_lock); 547 548 nr_remove_neigh_locked(s); 549 } 550 } 551 spin_unlock_bh(&nr_neigh_list_lock); 552} 553 554/* 555 * Check that the device given is a valid AX.25 interface that is "up". 556 * Or a valid ethernet interface with an AX.25 callsign binding. 557 */ 558static struct net_device *nr_ax25_dev_get(char *devname) 559{ 560 struct net_device *dev; 561 562 if ((dev = dev_get_by_name(&init_net, devname)) == NULL) 563 return NULL; 564 565 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) 566 return dev; 567 568 dev_put(dev); 569 return NULL; 570} 571 572/* 573 * Find the first active NET/ROM device, usually "nr0". 574 */ 575struct net_device *nr_dev_first(void) 576{ 577 struct net_device *dev, *first = NULL; 578 579 rcu_read_lock(); 580 for_each_netdev_rcu(&init_net, dev) { 581 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM) 582 if (first == NULL || strncmp(dev->name, first->name, 3) < 0) 583 first = dev; 584 } 585 dev_hold(first); 586 rcu_read_unlock(); 587 588 return first; 589} 590 591/* 592 * Find the NET/ROM device for the given callsign. 593 */ 594struct net_device *nr_dev_get(ax25_address *addr) 595{ 596 struct net_device *dev; 597 598 rcu_read_lock(); 599 for_each_netdev_rcu(&init_net, dev) { 600 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && 601 ax25cmp(addr, (const ax25_address *)dev->dev_addr) == 0) { 602 dev_hold(dev); 603 goto out; 604 } 605 } 606 dev = NULL; 607out: 608 rcu_read_unlock(); 609 return dev; 610} 611 612static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis, 613 ax25_address *digipeaters) 614{ 615 int i; 616 617 if (ndigis == 0) 618 return NULL; 619 620 for (i = 0; i < ndigis; i++) { 621 digi->calls[i] = digipeaters[i]; 622 digi->repeated[i] = 0; 623 } 624 625 digi->ndigi = ndigis; 626 digi->lastrepeat = -1; 627 628 return digi; 629} 630 631/* 632 * Handle the ioctls that control the routing functions. 633 */ 634int nr_rt_ioctl(unsigned int cmd, void __user *arg) 635{ 636 struct nr_route_struct nr_route; 637 struct net_device *dev; 638 ax25_digi digi; 639 int ret; 640 641 switch (cmd) { 642 case SIOCADDRT: 643 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) 644 return -EFAULT; 645 if (nr_route.ndigis > AX25_MAX_DIGIS) 646 return -EINVAL; 647 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) 648 return -EINVAL; 649 switch (nr_route.type) { 650 case NETROM_NODE: 651 if (strnlen(nr_route.mnemonic, 7) == 7) { 652 ret = -EINVAL; 653 break; 654 } 655 656 ret = nr_add_node(&nr_route.callsign, 657 nr_route.mnemonic, 658 &nr_route.neighbour, 659 nr_call_to_digi(&digi, nr_route.ndigis, 660 nr_route.digipeaters), 661 dev, nr_route.quality, 662 nr_route.obs_count); 663 break; 664 case NETROM_NEIGH: 665 ret = nr_add_neigh(&nr_route.callsign, 666 nr_call_to_digi(&digi, nr_route.ndigis, 667 nr_route.digipeaters), 668 dev, nr_route.quality); 669 break; 670 default: 671 ret = -EINVAL; 672 } 673 dev_put(dev); 674 return ret; 675 676 case SIOCDELRT: 677 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) 678 return -EFAULT; 679 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) 680 return -EINVAL; 681 switch (nr_route.type) { 682 case NETROM_NODE: 683 ret = nr_del_node(&nr_route.callsign, 684 &nr_route.neighbour, dev); 685 break; 686 case NETROM_NEIGH: 687 ret = nr_del_neigh(&nr_route.callsign, 688 dev, nr_route.quality); 689 break; 690 default: 691 ret = -EINVAL; 692 } 693 dev_put(dev); 694 return ret; 695 696 case SIOCNRDECOBS: 697 return nr_dec_obs(); 698 699 default: 700 return -EINVAL; 701 } 702 703 return 0; 704} 705 706/* 707 * A level 2 link has timed out, therefore it appears to be a poor link, 708 * then don't use that neighbour until it is reset. 709 */ 710void nr_link_failed(ax25_cb *ax25, int reason) 711{ 712 struct nr_neigh *s, *nr_neigh = NULL; 713 struct nr_node *nr_node = NULL; 714 715 spin_lock_bh(&nr_neigh_list_lock); 716 nr_neigh_for_each(s, &nr_neigh_list) { 717 if (s->ax25 == ax25) { 718 nr_neigh_hold(s); 719 nr_neigh = s; 720 break; 721 } 722 } 723 spin_unlock_bh(&nr_neigh_list_lock); 724 725 if (nr_neigh == NULL) 726 return; 727 728 nr_neigh->ax25 = NULL; 729 ax25_cb_put(ax25); 730 731 if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) { 732 nr_neigh_put(nr_neigh); 733 return; 734 } 735 spin_lock_bh(&nr_node_list_lock); 736 nr_node_for_each(nr_node, &nr_node_list) { 737 nr_node_lock(nr_node); 738 if (nr_node->which < nr_node->count && 739 nr_node->routes[nr_node->which].neighbour == nr_neigh) 740 nr_node->which++; 741 nr_node_unlock(nr_node); 742 } 743 spin_unlock_bh(&nr_node_list_lock); 744 nr_neigh_put(nr_neigh); 745} 746 747/* 748 * Route a frame to an appropriate AX.25 connection. A NULL ax25_cb 749 * indicates an internally generated frame. 750 */ 751int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25) 752{ 753 ax25_address *nr_src, *nr_dest; 754 struct nr_neigh *nr_neigh; 755 struct nr_node *nr_node; 756 struct net_device *dev; 757 unsigned char *dptr; 758 ax25_cb *ax25s; 759 int ret; 760 struct sk_buff *skbn; 761 762 763 nr_src = (ax25_address *)(skb->data + 0); 764 nr_dest = (ax25_address *)(skb->data + 7); 765 766 if (ax25 != NULL) { 767 ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat, 768 ax25->ax25_dev->dev, 0, 769 READ_ONCE(sysctl_netrom_obsolescence_count_initialiser)); 770 if (ret) 771 return ret; 772 } 773 774 if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */ 775 if (ax25 == NULL) /* Its from me */ 776 ret = nr_loopback_queue(skb); 777 else 778 ret = nr_rx_frame(skb, dev); 779 dev_put(dev); 780 return ret; 781 } 782 783 if (!READ_ONCE(sysctl_netrom_routing_control) && ax25 != NULL) 784 return 0; 785 786 /* Its Time-To-Live has expired */ 787 if (skb->data[14] == 1) { 788 return 0; 789 } 790 791 nr_node = nr_node_get(nr_dest); 792 if (nr_node == NULL) 793 return 0; 794 nr_node_lock(nr_node); 795 796 if (nr_node->which >= nr_node->count) { 797 nr_node_unlock(nr_node); 798 nr_node_put(nr_node); 799 return 0; 800 } 801 802 nr_neigh = nr_node->routes[nr_node->which].neighbour; 803 804 if ((dev = nr_dev_first()) == NULL) { 805 nr_node_unlock(nr_node); 806 nr_node_put(nr_node); 807 return 0; 808 } 809 810 /* We are going to change the netrom headers so we should get our 811 own skb, we also did not know until now how much header space 812 we had to reserve... - RXQ */ 813 if ((skbn=skb_copy_expand(skb, dev->hard_header_len, 0, GFP_ATOMIC)) == NULL) { 814 nr_node_unlock(nr_node); 815 nr_node_put(nr_node); 816 dev_put(dev); 817 return 0; 818 } 819 kfree_skb(skb); 820 skb=skbn; 821 skb->data[14]--; 822 823 dptr = skb_push(skb, 1); 824 *dptr = AX25_P_NETROM; 825 826 ax25s = nr_neigh->ax25; 827 nr_neigh->ax25 = ax25_send_frame(skb, 256, 828 (const ax25_address *)dev->dev_addr, 829 &nr_neigh->callsign, 830 nr_neigh->digipeat, nr_neigh->dev); 831 if (ax25s) 832 ax25_cb_put(ax25s); 833 834 dev_put(dev); 835 ret = (nr_neigh->ax25 != NULL); 836 nr_node_unlock(nr_node); 837 nr_node_put(nr_node); 838 839 return ret; 840} 841 842#ifdef CONFIG_PROC_FS 843 844static void *nr_node_start(struct seq_file *seq, loff_t *pos) 845 __acquires(&nr_node_list_lock) 846{ 847 spin_lock_bh(&nr_node_list_lock); 848 return seq_hlist_start_head(&nr_node_list, *pos); 849} 850 851static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos) 852{ 853 return seq_hlist_next(v, &nr_node_list, pos); 854} 855 856static void nr_node_stop(struct seq_file *seq, void *v) 857 __releases(&nr_node_list_lock) 858{ 859 spin_unlock_bh(&nr_node_list_lock); 860} 861 862static int nr_node_show(struct seq_file *seq, void *v) 863{ 864 char buf[11]; 865 int i; 866 867 if (v == SEQ_START_TOKEN) 868 seq_puts(seq, 869 "callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n"); 870 else { 871 struct nr_node *nr_node = hlist_entry(v, struct nr_node, 872 node_node); 873 874 nr_node_lock(nr_node); 875 seq_printf(seq, "%-9s %-7s %d %d", 876 ax2asc(buf, &nr_node->callsign), 877 (nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic, 878 nr_node->which + 1, 879 nr_node->count); 880 881 for (i = 0; i < nr_node->count; i++) { 882 seq_printf(seq, " %3d %d %05d", 883 nr_node->routes[i].quality, 884 nr_node->routes[i].obs_count, 885 nr_node->routes[i].neighbour->number); 886 } 887 nr_node_unlock(nr_node); 888 889 seq_puts(seq, "\n"); 890 } 891 return 0; 892} 893 894const struct seq_operations nr_node_seqops = { 895 .start = nr_node_start, 896 .next = nr_node_next, 897 .stop = nr_node_stop, 898 .show = nr_node_show, 899}; 900 901static void *nr_neigh_start(struct seq_file *seq, loff_t *pos) 902 __acquires(&nr_neigh_list_lock) 903{ 904 spin_lock_bh(&nr_neigh_list_lock); 905 return seq_hlist_start_head(&nr_neigh_list, *pos); 906} 907 908static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos) 909{ 910 return seq_hlist_next(v, &nr_neigh_list, pos); 911} 912 913static void nr_neigh_stop(struct seq_file *seq, void *v) 914 __releases(&nr_neigh_list_lock) 915{ 916 spin_unlock_bh(&nr_neigh_list_lock); 917} 918 919static int nr_neigh_show(struct seq_file *seq, void *v) 920{ 921 char buf[11]; 922 int i; 923 924 if (v == SEQ_START_TOKEN) 925 seq_puts(seq, "addr callsign dev qual lock count failed digipeaters\n"); 926 else { 927 struct nr_neigh *nr_neigh; 928 929 nr_neigh = hlist_entry(v, struct nr_neigh, neigh_node); 930 seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d", 931 nr_neigh->number, 932 ax2asc(buf, &nr_neigh->callsign), 933 nr_neigh->dev ? nr_neigh->dev->name : "???", 934 nr_neigh->quality, 935 nr_neigh->locked, 936 nr_neigh->count, 937 nr_neigh->failed); 938 939 if (nr_neigh->digipeat != NULL) { 940 for (i = 0; i < nr_neigh->digipeat->ndigi; i++) 941 seq_printf(seq, " %s", 942 ax2asc(buf, &nr_neigh->digipeat->calls[i])); 943 } 944 945 seq_puts(seq, "\n"); 946 } 947 return 0; 948} 949 950const struct seq_operations nr_neigh_seqops = { 951 .start = nr_neigh_start, 952 .next = nr_neigh_next, 953 .stop = nr_neigh_stop, 954 .show = nr_neigh_show, 955}; 956#endif 957 958/* 959 * Free all memory associated with the nodes and routes lists. 960 */ 961void nr_rt_free(void) 962{ 963 struct nr_neigh *s = NULL; 964 struct nr_node *t = NULL; 965 struct hlist_node *nodet; 966 967 spin_lock_bh(&nr_neigh_list_lock); 968 spin_lock_bh(&nr_node_list_lock); 969 nr_node_for_each_safe(t, nodet, &nr_node_list) { 970 nr_node_lock(t); 971 nr_remove_node_locked(t); 972 nr_node_unlock(t); 973 } 974 nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { 975 while(s->count) { 976 s->count--; 977 nr_neigh_put(s); 978 } 979 nr_remove_neigh_locked(s); 980 } 981 spin_unlock_bh(&nr_node_list_lock); 982 spin_unlock_bh(&nr_neigh_list_lock); 983} 984