Skip to content
This repository
tree: 93d89e2d51
Fetching contributors…

Cannot retrieve contributors at this time

file 1034 lines (878 sloc) 23.681 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
* Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
* Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/arp.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/termios.h> /* For TIOCINQ/OUTQ */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/netfilter.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <net/netrom.h>
#include <linux/seq_file.h>
#include <linux/export.h>

static unsigned int nr_neigh_no = 1;

static HLIST_HEAD(nr_node_list);
static DEFINE_SPINLOCK(nr_node_list_lock);
static HLIST_HEAD(nr_neigh_list);
static DEFINE_SPINLOCK(nr_neigh_list_lock);

static struct nr_node *nr_node_get(ax25_address *callsign)
{
struct nr_node *found = NULL;
struct nr_node *nr_node;
struct hlist_node *node;

spin_lock_bh(&nr_node_list_lock);
nr_node_for_each(nr_node, node, &nr_node_list)
if (ax25cmp(callsign, &nr_node->callsign) == 0) {
nr_node_hold(nr_node);
found = nr_node;
break;
}
spin_unlock_bh(&nr_node_list_lock);
return found;
}

static struct nr_neigh *nr_neigh_get_dev(ax25_address *callsign,
struct net_device *dev)
{
struct nr_neigh *found = NULL;
struct nr_neigh *nr_neigh;
struct hlist_node *node;

spin_lock_bh(&nr_neigh_list_lock);
nr_neigh_for_each(nr_neigh, node, &nr_neigh_list)
if (ax25cmp(callsign, &nr_neigh->callsign) == 0 &&
nr_neigh->dev == dev) {
nr_neigh_hold(nr_neigh);
found = nr_neigh;
break;
}
spin_unlock_bh(&nr_neigh_list_lock);
return found;
}

static void nr_remove_neigh(struct nr_neigh *);

/*
* Add a new route to a node, and in the process add the node and the
* neighbour if it is new.
*/
static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
ax25_address *ax25, ax25_digi *ax25_digi, struct net_device *dev,
int quality, int obs_count)
{
struct nr_node *nr_node;
struct nr_neigh *nr_neigh;
struct nr_route nr_route;
int i, found;
struct net_device *odev;

if ((odev=nr_dev_get(nr)) != NULL) { /* Can't add routes to ourself */
dev_put(odev);
return -EINVAL;
}

nr_node = nr_node_get(nr);

nr_neigh = nr_neigh_get_dev(ax25, dev);

/*
* The L2 link to a neighbour has failed in the past
* and now a frame comes from this neighbour. We assume
* it was a temporary trouble with the link and reset the
* routes now (and not wait for a node broadcast).
*/
if (nr_neigh != NULL && nr_neigh->failed != 0 && quality == 0) {
struct nr_node *nr_nodet;
struct hlist_node *node;

spin_lock_bh(&nr_node_list_lock);
nr_node_for_each(nr_nodet, node, &nr_node_list) {
nr_node_lock(nr_nodet);
for (i = 0; i < nr_nodet->count; i++)
if (nr_nodet->routes[i].neighbour == nr_neigh)
if (i < nr_nodet->which)
nr_nodet->which = i;
nr_node_unlock(nr_nodet);
}
spin_unlock_bh(&nr_node_list_lock);
}

if (nr_neigh != NULL)
nr_neigh->failed = 0;

if (quality == 0 && nr_neigh != NULL && nr_node != NULL) {
nr_neigh_put(nr_neigh);
nr_node_put(nr_node);
return 0;
}

if (nr_neigh == NULL) {
if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) {
if (nr_node)
nr_node_put(nr_node);
return -ENOMEM;
}

nr_neigh->callsign = *ax25;
nr_neigh->digipeat = NULL;
nr_neigh->ax25 = NULL;
nr_neigh->dev = dev;
nr_neigh->quality = sysctl_netrom_default_path_quality;
nr_neigh->locked = 0;
nr_neigh->count = 0;
nr_neigh->number = nr_neigh_no++;
nr_neigh->failed = 0;
atomic_set(&nr_neigh->refcount, 1);

if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
nr_neigh->digipeat = kmemdup(ax25_digi,
sizeof(*ax25_digi),
GFP_KERNEL);
if (nr_neigh->digipeat == NULL) {
kfree(nr_neigh);
if (nr_node)
nr_node_put(nr_node);
return -ENOMEM;
}
}

spin_lock_bh(&nr_neigh_list_lock);
hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list);
nr_neigh_hold(nr_neigh);
spin_unlock_bh(&nr_neigh_list_lock);
}

if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked)
nr_neigh->quality = quality;

if (nr_node == NULL) {
if ((nr_node = kmalloc(sizeof(*nr_node), GFP_ATOMIC)) == NULL) {
if (nr_neigh)
nr_neigh_put(nr_neigh);
return -ENOMEM;
}

nr_node->callsign = *nr;
strcpy(nr_node->mnemonic, mnemonic);

nr_node->which = 0;
nr_node->count = 1;
atomic_set(&nr_node->refcount, 1);
spin_lock_init(&nr_node->node_lock);

nr_node->routes[0].quality = quality;
nr_node->routes[0].obs_count = obs_count;
nr_node->routes[0].neighbour = nr_neigh;

nr_neigh_hold(nr_neigh);
nr_neigh->count++;

spin_lock_bh(&nr_node_list_lock);
hlist_add_head(&nr_node->node_node, &nr_node_list);
/* refcount initialized at 1 */
spin_unlock_bh(&nr_node_list_lock);

return 0;
}
nr_node_lock(nr_node);

if (quality != 0)
strcpy(nr_node->mnemonic, mnemonic);

for (found = 0, i = 0; i < nr_node->count; i++) {
if (nr_node->routes[i].neighbour == nr_neigh) {
nr_node->routes[i].quality = quality;
nr_node->routes[i].obs_count = obs_count;
found = 1;
break;
}
}

if (!found) {
/* We have space at the bottom, slot it in */
if (nr_node->count < 3) {
nr_node->routes[2] = nr_node->routes[1];
nr_node->routes[1] = nr_node->routes[0];

nr_node->routes[0].quality = quality;
nr_node->routes[0].obs_count = obs_count;
nr_node->routes[0].neighbour = nr_neigh;

nr_node->which++;
nr_node->count++;
nr_neigh_hold(nr_neigh);
nr_neigh->count++;
} else {
/* It must be better than the worst */
if (quality > nr_node->routes[2].quality) {
nr_node->routes[2].neighbour->count--;
nr_neigh_put(nr_node->routes[2].neighbour);

if (nr_node->routes[2].neighbour->count == 0 && !nr_node->routes[2].neighbour->locked)
nr_remove_neigh(nr_node->routes[2].neighbour);

nr_node->routes[2].quality = quality;
nr_node->routes[2].obs_count = obs_count;
nr_node->routes[2].neighbour = nr_neigh;

nr_neigh_hold(nr_neigh);
nr_neigh->count++;
}
}
}

/* Now re-sort the routes in quality order */
switch (nr_node->count) {
case 3:
if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
switch (nr_node->which) {
case 0:
nr_node->which = 1;
break;
case 1:
nr_node->which = 0;
break;
}
nr_route = nr_node->routes[0];
nr_node->routes[0] = nr_node->routes[1];
nr_node->routes[1] = nr_route;
}
if (nr_node->routes[2].quality > nr_node->routes[1].quality) {
switch (nr_node->which) {
case 1: nr_node->which = 2;
break;

case 2: nr_node->which = 1;
break;

default:
break;
}
nr_route = nr_node->routes[1];
nr_node->routes[1] = nr_node->routes[2];
nr_node->routes[2] = nr_route;
}
case 2:
if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
switch (nr_node->which) {
case 0: nr_node->which = 1;
break;

case 1: nr_node->which = 0;
break;

default: break;
}
nr_route = nr_node->routes[0];
nr_node->routes[0] = nr_node->routes[1];
nr_node->routes[1] = nr_route;
}
case 1:
break;
}

for (i = 0; i < nr_node->count; i++) {
if (nr_node->routes[i].neighbour == nr_neigh) {
if (i < nr_node->which)
nr_node->which = i;
break;
}
}

nr_neigh_put(nr_neigh);
nr_node_unlock(nr_node);
nr_node_put(nr_node);
return 0;
}

static inline void __nr_remove_node(struct nr_node *nr_node)
{
hlist_del_init(&nr_node->node_node);
nr_node_put(nr_node);
}

#define nr_remove_node_locked(__node) \
__nr_remove_node(__node)

static void nr_remove_node(struct nr_node *nr_node)
{
spin_lock_bh(&nr_node_list_lock);
__nr_remove_node(nr_node);
spin_unlock_bh(&nr_node_list_lock);
}

static inline void __nr_remove_neigh(struct nr_neigh *nr_neigh)
{
hlist_del_init(&nr_neigh->neigh_node);
nr_neigh_put(nr_neigh);
}

#define nr_remove_neigh_locked(__neigh) \
__nr_remove_neigh(__neigh)

static void nr_remove_neigh(struct nr_neigh *nr_neigh)
{
spin_lock_bh(&nr_neigh_list_lock);
__nr_remove_neigh(nr_neigh);
spin_unlock_bh(&nr_neigh_list_lock);
}

/*
* "Delete" a node. Strictly speaking remove a route to a node. The node
* is only deleted if no routes are left to it.
*/
static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev)
{
struct nr_node *nr_node;
struct nr_neigh *nr_neigh;
int i;

nr_node = nr_node_get(callsign);

if (nr_node == NULL)
return -EINVAL;

nr_neigh = nr_neigh_get_dev(neighbour, dev);

if (nr_neigh == NULL) {
nr_node_put(nr_node);
return -EINVAL;
}

nr_node_lock(nr_node);
for (i = 0; i < nr_node->count; i++) {
if (nr_node->routes[i].neighbour == nr_neigh) {
nr_neigh->count--;
nr_neigh_put(nr_neigh);

if (nr_neigh->count == 0 && !nr_neigh->locked)
nr_remove_neigh(nr_neigh);
nr_neigh_put(nr_neigh);

nr_node->count--;

if (nr_node->count == 0) {
nr_remove_node(nr_node);
} else {
switch (i) {
case 0:
nr_node->routes[0] = nr_node->routes[1];
case 1:
nr_node->routes[1] = nr_node->routes[2];
case 2:
break;
}
nr_node_put(nr_node);
}
nr_node_unlock(nr_node);

return 0;
}
}
nr_neigh_put(nr_neigh);
nr_node_unlock(nr_node);
nr_node_put(nr_node);

return -EINVAL;
}

/*
* Lock a neighbour with a quality.
*/
static int __must_check nr_add_neigh(ax25_address *callsign,
ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality)
{
struct nr_neigh *nr_neigh;

nr_neigh = nr_neigh_get_dev(callsign, dev);
if (nr_neigh) {
nr_neigh->quality = quality;
nr_neigh->locked = 1;
nr_neigh_put(nr_neigh);
return 0;
}

if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL)
return -ENOMEM;

nr_neigh->callsign = *callsign;
nr_neigh->digipeat = NULL;
nr_neigh->ax25 = NULL;
nr_neigh->dev = dev;
nr_neigh->quality = quality;
nr_neigh->locked = 1;
nr_neigh->count = 0;
nr_neigh->number = nr_neigh_no++;
nr_neigh->failed = 0;
atomic_set(&nr_neigh->refcount, 1);

if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi),
GFP_KERNEL);
if (nr_neigh->digipeat == NULL) {
kfree(nr_neigh);
return -ENOMEM;
}
}

spin_lock_bh(&nr_neigh_list_lock);
hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list);
/* refcount is initialized at 1 */
spin_unlock_bh(&nr_neigh_list_lock);

return 0;
}

/*
* "Delete" a neighbour. The neighbour is only removed if the number
* of nodes that may use it is zero.
*/
static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality)
{
struct nr_neigh *nr_neigh;

nr_neigh = nr_neigh_get_dev(callsign, dev);

if (nr_neigh == NULL) return -EINVAL;

nr_neigh->quality = quality;
nr_neigh->locked = 0;

if (nr_neigh->count == 0)
nr_remove_neigh(nr_neigh);
nr_neigh_put(nr_neigh);

return 0;
}

/*
* Decrement the obsolescence count by one. If a route is reduced to a
* count of zero, remove it. Also remove any unlocked neighbours with
* zero nodes routing via it.
*/
static int nr_dec_obs(void)
{
struct nr_neigh *nr_neigh;
struct nr_node *s;
struct hlist_node *node, *nodet;
int i;

spin_lock_bh(&nr_node_list_lock);
nr_node_for_each_safe(s, node, nodet, &nr_node_list) {
nr_node_lock(s);
for (i = 0; i < s->count; i++) {
switch (s->routes[i].obs_count) {
case 0: /* A locked entry */
break;

case 1: /* From 1 -> 0 */
nr_neigh = s->routes[i].neighbour;

nr_neigh->count--;
nr_neigh_put(nr_neigh);

if (nr_neigh->count == 0 && !nr_neigh->locked)
nr_remove_neigh(nr_neigh);

s->count--;

switch (i) {
case 0:
s->routes[0] = s->routes[1];
/* Fallthrough */
case 1:
s->routes[1] = s->routes[2];
case 2:
break;
}
break;

default:
s->routes[i].obs_count--;
break;

}
}

if (s->count <= 0)
nr_remove_node_locked(s);
nr_node_unlock(s);
}
spin_unlock_bh(&nr_node_list_lock);

return 0;
}

/*
* A device has been removed. Remove its routes and neighbours.
*/
void nr_rt_device_down(struct net_device *dev)
{
struct nr_neigh *s;
struct hlist_node *node, *nodet, *node2, *node2t;
struct nr_node *t;
int i;

spin_lock_bh(&nr_neigh_list_lock);
nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) {
if (s->dev == dev) {
spin_lock_bh(&nr_node_list_lock);
nr_node_for_each_safe(t, node2, node2t, &nr_node_list) {
nr_node_lock(t);
for (i = 0; i < t->count; i++) {
if (t->routes[i].neighbour == s) {
t->count--;

switch (i) {
case 0:
t->routes[0] = t->routes[1];
case 1:
t->routes[1] = t->routes[2];
case 2:
break;
}
}
}

if (t->count <= 0)
nr_remove_node_locked(t);
nr_node_unlock(t);
}
spin_unlock_bh(&nr_node_list_lock);

nr_remove_neigh_locked(s);
}
}
spin_unlock_bh(&nr_neigh_list_lock);
}

/*
* Check that the device given is a valid AX.25 interface that is "up".
* Or a valid ethernet interface with an AX.25 callsign binding.
*/
static struct net_device *nr_ax25_dev_get(char *devname)
{
struct net_device *dev;

if ((dev = dev_get_by_name(&init_net, devname)) == NULL)
return NULL;

if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
return dev;

dev_put(dev);
return NULL;
}

/*
* Find the first active NET/ROM device, usually "nr0".
*/
struct net_device *nr_dev_first(void)
{
struct net_device *dev, *first = NULL;

rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM)
if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
first = dev;
}
if (first)
dev_hold(first);
rcu_read_unlock();

return first;
}

/*
* Find the NET/ROM device for the given callsign.
*/
struct net_device *nr_dev_get(ax25_address *addr)
{
struct net_device *dev;

rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM &&
ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) {
dev_hold(dev);
goto out;
}
}
dev = NULL;
out:
rcu_read_unlock();
return dev;
}

static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis,
ax25_address *digipeaters)
{
int i;

if (ndigis == 0)
return NULL;

for (i = 0; i < ndigis; i++) {
digi->calls[i] = digipeaters[i];
digi->repeated[i] = 0;
}

digi->ndigi = ndigis;
digi->lastrepeat = -1;

return digi;
}

/*
* Handle the ioctls that control the routing functions.
*/
int nr_rt_ioctl(unsigned int cmd, void __user *arg)
{
struct nr_route_struct nr_route;
struct net_device *dev;
ax25_digi digi;
int ret;

switch (cmd) {
case SIOCADDRT:
if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
return -EFAULT;
if (nr_route.ndigis > AX25_MAX_DIGIS)
return -EINVAL;
if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
return -EINVAL;
switch (nr_route.type) {
case NETROM_NODE:
if (strnlen(nr_route.mnemonic, 7) == 7) {
ret = -EINVAL;
break;
}

ret = nr_add_node(&nr_route.callsign,
nr_route.mnemonic,
&nr_route.neighbour,
nr_call_to_digi(&digi, nr_route.ndigis,
nr_route.digipeaters),
dev, nr_route.quality,
nr_route.obs_count);
break;
case NETROM_NEIGH:
ret = nr_add_neigh(&nr_route.callsign,
nr_call_to_digi(&digi, nr_route.ndigis,
nr_route.digipeaters),
dev, nr_route.quality);
break;
default:
ret = -EINVAL;
}
dev_put(dev);
return ret;

case SIOCDELRT:
if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
return -EFAULT;
if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
return -EINVAL;
switch (nr_route.type) {
case NETROM_NODE:
ret = nr_del_node(&nr_route.callsign,
&nr_route.neighbour, dev);
break;
case NETROM_NEIGH:
ret = nr_del_neigh(&nr_route.callsign,
dev, nr_route.quality);
break;
default:
ret = -EINVAL;
}
dev_put(dev);
return ret;

case SIOCNRDECOBS:
return nr_dec_obs();

default:
return -EINVAL;
}

return 0;
}

/*
* A level 2 link has timed out, therefore it appears to be a poor link,
* then don't use that neighbour until it is reset.
*/
void nr_link_failed(ax25_cb *ax25, int reason)
{
struct nr_neigh *s, *nr_neigh = NULL;
struct hlist_node *node;
struct nr_node *nr_node = NULL;

spin_lock_bh(&nr_neigh_list_lock);
nr_neigh_for_each(s, node, &nr_neigh_list) {
if (s->ax25 == ax25) {
nr_neigh_hold(s);
nr_neigh = s;
break;
}
}
spin_unlock_bh(&nr_neigh_list_lock);

if (nr_neigh == NULL)
return;

nr_neigh->ax25 = NULL;
ax25_cb_put(ax25);

if (++nr_neigh->failed < sysctl_netrom_link_fails_count) {
nr_neigh_put(nr_neigh);
return;
}
spin_lock_bh(&nr_node_list_lock);
nr_node_for_each(nr_node, node, &nr_node_list) {
nr_node_lock(nr_node);
if (nr_node->which < nr_node->count &&
nr_node->routes[nr_node->which].neighbour == nr_neigh)
nr_node->which++;
nr_node_unlock(nr_node);
}
spin_unlock_bh(&nr_node_list_lock);
nr_neigh_put(nr_neigh);
}

/*
* Route a frame to an appropriate AX.25 connection. A NULL ax25_cb
* indicates an internally generated frame.
*/
int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25)
{
ax25_address *nr_src, *nr_dest;
struct nr_neigh *nr_neigh;
struct nr_node *nr_node;
struct net_device *dev;
unsigned char *dptr;
ax25_cb *ax25s;
int ret;
struct sk_buff *skbn;


nr_src = (ax25_address *)(skb->data + 0);
nr_dest = (ax25_address *)(skb->data + 7);

if (ax25 != NULL) {
ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat,
ax25->ax25_dev->dev, 0,
sysctl_netrom_obsolescence_count_initialiser);
if (ret)
return ret;
}

if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */
if (ax25 == NULL) /* Its from me */
ret = nr_loopback_queue(skb);
else
ret = nr_rx_frame(skb, dev);
dev_put(dev);
return ret;
}

if (!sysctl_netrom_routing_control && ax25 != NULL)
return 0;

/* Its Time-To-Live has expired */
if (skb->data[14] == 1) {
return 0;
}

nr_node = nr_node_get(nr_dest);
if (nr_node == NULL)
return 0;
nr_node_lock(nr_node);

if (nr_node->which >= nr_node->count) {
nr_node_unlock(nr_node);
nr_node_put(nr_node);
return 0;
}

nr_neigh = nr_node->routes[nr_node->which].neighbour;

if ((dev = nr_dev_first()) == NULL) {
nr_node_unlock(nr_node);
nr_node_put(nr_node);
return 0;
}

/* We are going to change the netrom headers so we should get our
own skb, we also did not know until now how much header space
we had to reserve... - RXQ */
if ((skbn=skb_copy_expand(skb, dev->hard_header_len, 0, GFP_ATOMIC)) == NULL) {
nr_node_unlock(nr_node);
nr_node_put(nr_node);
dev_put(dev);
return 0;
}
kfree_skb(skb);
skb=skbn;
skb->data[14]--;

dptr = skb_push(skb, 1);
*dptr = AX25_P_NETROM;

ax25s = nr_neigh->ax25;
nr_neigh->ax25 = ax25_send_frame(skb, 256,
(ax25_address *)dev->dev_addr,
&nr_neigh->callsign,
nr_neigh->digipeat, nr_neigh->dev);
if (ax25s)
ax25_cb_put(ax25s);

dev_put(dev);
ret = (nr_neigh->ax25 != NULL);
nr_node_unlock(nr_node);
nr_node_put(nr_node);

return ret;
}

#ifdef CONFIG_PROC_FS

static void *nr_node_start(struct seq_file *seq, loff_t *pos)
{
spin_lock_bh(&nr_node_list_lock);
return seq_hlist_start_head(&nr_node_list, *pos);
}

static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos)
{
return seq_hlist_next(v, &nr_node_list, pos);
}

static void nr_node_stop(struct seq_file *seq, void *v)
{
spin_unlock_bh(&nr_node_list_lock);
}

static int nr_node_show(struct seq_file *seq, void *v)
{
char buf[11];
int i;

if (v == SEQ_START_TOKEN)
seq_puts(seq,
"callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n");
else {
struct nr_node *nr_node = hlist_entry(v, struct nr_node,
node_node);

nr_node_lock(nr_node);
seq_printf(seq, "%-9s %-7s %d %d",
ax2asc(buf, &nr_node->callsign),
(nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic,
nr_node->which + 1,
nr_node->count);

for (i = 0; i < nr_node->count; i++) {
seq_printf(seq, " %3d %d %05d",
nr_node->routes[i].quality,
nr_node->routes[i].obs_count,
nr_node->routes[i].neighbour->number);
}
nr_node_unlock(nr_node);

seq_puts(seq, "\n");
}
return 0;
}

static const struct seq_operations nr_node_seqops = {
.start = nr_node_start,
.next = nr_node_next,
.stop = nr_node_stop,
.show = nr_node_show,
};

static int nr_node_info_open(struct inode *inode, struct file *file)
{
return seq_open(file, &nr_node_seqops);
}

const struct file_operations nr_nodes_fops = {
.owner = THIS_MODULE,
.open = nr_node_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};

static void *nr_neigh_start(struct seq_file *seq, loff_t *pos)
{
spin_lock_bh(&nr_neigh_list_lock);
return seq_hlist_start_head(&nr_neigh_list, *pos);
}

static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
{
return seq_hlist_next(v, &nr_neigh_list, pos);
}

static void nr_neigh_stop(struct seq_file *seq, void *v)
{
spin_unlock_bh(&nr_neigh_list_lock);
}

static int nr_neigh_show(struct seq_file *seq, void *v)
{
char buf[11];
int i;

if (v == SEQ_START_TOKEN)
seq_puts(seq, "addr callsign dev qual lock count failed digipeaters\n");
else {
struct nr_neigh *nr_neigh;

nr_neigh = hlist_entry(v, struct nr_neigh, neigh_node);
seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d",
nr_neigh->number,
ax2asc(buf, &nr_neigh->callsign),
nr_neigh->dev ? nr_neigh->dev->name : "???",
nr_neigh->quality,
nr_neigh->locked,
nr_neigh->count,
nr_neigh->failed);

if (nr_neigh->digipeat != NULL) {
for (i = 0; i < nr_neigh->digipeat->ndigi; i++)
seq_printf(seq, " %s",
ax2asc(buf, &nr_neigh->digipeat->calls[i]));
}

seq_puts(seq, "\n");
}
return 0;
}

static const struct seq_operations nr_neigh_seqops = {
.start = nr_neigh_start,
.next = nr_neigh_next,
.stop = nr_neigh_stop,
.show = nr_neigh_show,
};

static int nr_neigh_info_open(struct inode *inode, struct file *file)
{
return seq_open(file, &nr_neigh_seqops);
}

const struct file_operations nr_neigh_fops = {
.owner = THIS_MODULE,
.open = nr_neigh_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};

#endif

/*
* Free all memory associated with the nodes and routes lists.
*/
void __exit nr_rt_free(void)
{
struct nr_neigh *s = NULL;
struct nr_node *t = NULL;
struct hlist_node *node, *nodet;

spin_lock_bh(&nr_neigh_list_lock);
spin_lock_bh(&nr_node_list_lock);
nr_node_for_each_safe(t, node, nodet, &nr_node_list) {
nr_node_lock(t);
nr_remove_node_locked(t);
nr_node_unlock(t);
}
nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) {
while(s->count) {
s->count--;
nr_neigh_put(s);
}
nr_remove_neigh_locked(s);
}
spin_unlock_bh(&nr_node_list_lock);
spin_unlock_bh(&nr_neigh_list_lock);
}
Something went wrong with that request. Please try again.