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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
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> | |
1da177e4 LT |
13 | #include <linux/timer.h> |
14 | #include <linux/string.h> | |
15 | #include <linux/sockios.h> | |
16 | #include <linux/net.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
dc8e5416 | 25 | #include <linux/uaccess.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/spinlock.h> | |
33 | #include <net/netrom.h> | |
34 | #include <linux/seq_file.h> | |
bc3b2d7f | 35 | #include <linux/export.h> |
1da177e4 LT |
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; | |
1da177e4 LT |
48 | |
49 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 50 | nr_node_for_each(nr_node, &nr_node_list) |
1da177e4 LT |
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; | |
1da177e4 LT |
65 | |
66 | spin_lock_bh(&nr_neigh_list_lock); | |
b67bfe0d | 67 | nr_neigh_for_each(nr_neigh, &nr_neigh_list) |
1da177e4 LT |
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 | ||
4c316069 GS |
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 | ||
1da177e4 LT |
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 | */ | |
c9266b99 RB |
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) | |
1da177e4 LT |
100 | { |
101 | struct nr_node *nr_node; | |
102 | struct nr_neigh *nr_neigh; | |
1da177e4 LT |
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; | |
1da177e4 LT |
123 | |
124 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 125 | nr_node_for_each(nr_nodet, &nr_node_list) { |
1da177e4 LT |
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; | |
958d6145 | 156 | nr_neigh->quality = READ_ONCE(sysctl_netrom_default_path_quality); |
1da177e4 LT |
157 | nr_neigh->locked = 0; |
158 | nr_neigh->count = 0; | |
159 | nr_neigh->number = nr_neigh_no++; | |
160 | nr_neigh->failed = 0; | |
af420749 | 161 | refcount_set(&nr_neigh->refcount, 1); |
1da177e4 LT |
162 | |
163 | if (ax25_digi != NULL && ax25_digi->ndigi > 0) { | |
eafff86d ACM |
164 | nr_neigh->digipeat = kmemdup(ax25_digi, |
165 | sizeof(*ax25_digi), | |
166 | GFP_KERNEL); | |
167 | if (nr_neigh->digipeat == NULL) { | |
1da177e4 LT |
168 | kfree(nr_neigh); |
169 | if (nr_node) | |
170 | nr_node_put(nr_node); | |
171 | return -ENOMEM; | |
172 | } | |
1da177e4 LT |
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; | |
156be7ed | 196 | refcount_set(&nr_node->refcount, 1); |
1da177e4 LT |
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 | ||
d03f2284 | 211 | nr_neigh_put(nr_neigh); |
1da177e4 LT |
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: | |
4c316069 GS |
264 | re_sort_routes(nr_node, 0, 1); |
265 | re_sort_routes(nr_node, 1, 2); | |
df561f66 | 266 | fallthrough; |
1da177e4 | 267 | case 2: |
4c316069 | 268 | re_sort_routes(nr_node, 0, 1); |
6518e3fc | 269 | break; |
1da177e4 LT |
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 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 | ||
297 | static 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 | ||
304 | static 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 | ||
313 | static 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 | */ | |
324 | static 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]; | |
df561f66 | 360 | fallthrough; |
1da177e4 LT |
361 | case 1: |
362 | nr_node->routes[1] = nr_node->routes[2]; | |
6518e3fc | 363 | fallthrough; |
1da177e4 LT |
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 | */ | |
c9266b99 RB |
384 | static int __must_check nr_add_neigh(ax25_address *callsign, |
385 | ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality) | |
1da177e4 LT |
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; | |
af420749 | 409 | refcount_set(&nr_neigh->refcount, 1); |
1da177e4 LT |
410 | |
411 | if (ax25_digi != NULL && ax25_digi->ndigi > 0) { | |
eafff86d ACM |
412 | nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi), |
413 | GFP_KERNEL); | |
414 | if (nr_neigh->digipeat == NULL) { | |
1da177e4 LT |
415 | kfree(nr_neigh); |
416 | return -ENOMEM; | |
417 | } | |
1da177e4 LT |
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 | */ | |
432 | static 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 | */ | |
455 | static int nr_dec_obs(void) | |
456 | { | |
457 | struct nr_neigh *nr_neigh; | |
458 | struct nr_node *s; | |
b67bfe0d | 459 | struct hlist_node *nodet; |
1da177e4 LT |
460 | int i; |
461 | ||
462 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 463 | nr_node_for_each_safe(s, nodet, &nr_node_list) { |
1da177e4 LT |
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) { | |
c4855389 JP |
482 | case 0: |
483 | s->routes[0] = s->routes[1]; | |
df561f66 | 484 | fallthrough; |
c4855389 JP |
485 | case 1: |
486 | s->routes[1] = s->routes[2]; | |
6518e3fc | 487 | break; |
c4855389 JP |
488 | case 2: |
489 | break; | |
1da177e4 LT |
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 | */ | |
512 | void nr_rt_device_down(struct net_device *dev) | |
513 | { | |
514 | struct nr_neigh *s; | |
b67bfe0d | 515 | struct hlist_node *nodet, *node2t; |
1da177e4 LT |
516 | struct nr_node *t; |
517 | int i; | |
518 | ||
519 | spin_lock_bh(&nr_neigh_list_lock); | |
b67bfe0d | 520 | nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { |
1da177e4 LT |
521 | if (s->dev == dev) { |
522 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 523 | nr_node_for_each_safe(t, node2t, &nr_node_list) { |
1da177e4 LT |
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]; | |
df561f66 | 532 | fallthrough; |
1da177e4 LT |
533 | case 1: |
534 | t->routes[1] = t->routes[2]; | |
6518e3fc | 535 | break; |
1da177e4 LT |
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 | */ | |
558 | static struct net_device *nr_ax25_dev_get(char *devname) | |
559 | { | |
560 | struct net_device *dev; | |
561 | ||
881d966b | 562 | if ((dev = dev_get_by_name(&init_net, devname)) == NULL) |
1da177e4 LT |
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 | */ | |
575 | struct net_device *nr_dev_first(void) | |
576 | { | |
577 | struct net_device *dev, *first = NULL; | |
578 | ||
c6d14c84 ED |
579 | rcu_read_lock(); |
580 | for_each_netdev_rcu(&init_net, dev) { | |
1da177e4 LT |
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 | } | |
1160dfa1 | 585 | dev_hold(first); |
c6d14c84 | 586 | rcu_read_unlock(); |
1da177e4 LT |
587 | |
588 | return first; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Find the NET/ROM device for the given callsign. | |
593 | */ | |
594 | struct net_device *nr_dev_get(ax25_address *addr) | |
595 | { | |
596 | struct net_device *dev; | |
597 | ||
c6d14c84 ED |
598 | rcu_read_lock(); |
599 | for_each_netdev_rcu(&init_net, dev) { | |
600 | if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && | |
c045ad2c | 601 | ax25cmp(addr, (const ax25_address *)dev->dev_addr) == 0) { |
1da177e4 LT |
602 | dev_hold(dev); |
603 | goto out; | |
604 | } | |
605 | } | |
7562f876 | 606 | dev = NULL; |
1da177e4 | 607 | out: |
c6d14c84 | 608 | rcu_read_unlock(); |
1da177e4 LT |
609 | return dev; |
610 | } | |
611 | ||
c6ba973b RB |
612 | static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis, |
613 | ax25_address *digipeaters) | |
1da177e4 | 614 | { |
1da177e4 LT |
615 | int i; |
616 | ||
617 | if (ndigis == 0) | |
618 | return NULL; | |
619 | ||
620 | for (i = 0; i < ndigis; i++) { | |
c6ba973b RB |
621 | digi->calls[i] = digipeaters[i]; |
622 | digi->repeated[i] = 0; | |
1da177e4 LT |
623 | } |
624 | ||
c6ba973b RB |
625 | digi->ndigi = ndigis; |
626 | digi->lastrepeat = -1; | |
1da177e4 | 627 | |
c6ba973b | 628 | return digi; |
1da177e4 LT |
629 | } |
630 | ||
631 | /* | |
632 | * Handle the ioctls that control the routing functions. | |
633 | */ | |
634 | int nr_rt_ioctl(unsigned int cmd, void __user *arg) | |
635 | { | |
636 | struct nr_route_struct nr_route; | |
637 | struct net_device *dev; | |
c6ba973b | 638 | ax25_digi digi; |
1da177e4 LT |
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; | |
10cae1c8 | 645 | if (nr_route.ndigis > AX25_MAX_DIGIS) |
1da177e4 | 646 | return -EINVAL; |
10cae1c8 | 647 | if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) |
1da177e4 | 648 | return -EINVAL; |
1da177e4 LT |
649 | switch (nr_route.type) { |
650 | case NETROM_NODE: | |
ac1a1de3 RB |
651 | if (strnlen(nr_route.mnemonic, 7) == 7) { |
652 | ret = -EINVAL; | |
653 | break; | |
654 | } | |
655 | ||
1da177e4 LT |
656 | ret = nr_add_node(&nr_route.callsign, |
657 | nr_route.mnemonic, | |
658 | &nr_route.neighbour, | |
c6ba973b RB |
659 | nr_call_to_digi(&digi, nr_route.ndigis, |
660 | nr_route.digipeaters), | |
1da177e4 LT |
661 | dev, nr_route.quality, |
662 | nr_route.obs_count); | |
663 | break; | |
664 | case NETROM_NEIGH: | |
665 | ret = nr_add_neigh(&nr_route.callsign, | |
c6ba973b RB |
666 | nr_call_to_digi(&digi, nr_route.ndigis, |
667 | nr_route.digipeaters), | |
1da177e4 LT |
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 | */ | |
710 | void nr_link_failed(ax25_cb *ax25, int reason) | |
711 | { | |
712 | struct nr_neigh *s, *nr_neigh = NULL; | |
1da177e4 LT |
713 | struct nr_node *nr_node = NULL; |
714 | ||
715 | spin_lock_bh(&nr_neigh_list_lock); | |
b67bfe0d | 716 | nr_neigh_for_each(s, &nr_neigh_list) { |
1da177e4 LT |
717 | if (s->ax25 == ax25) { |
718 | nr_neigh_hold(s); | |
719 | nr_neigh = s; | |
720 | break; | |
721 | } | |
52383678 | 722 | } |
1da177e4 LT |
723 | spin_unlock_bh(&nr_neigh_list_lock); |
724 | ||
52383678 RB |
725 | if (nr_neigh == NULL) |
726 | return; | |
1da177e4 LT |
727 | |
728 | nr_neigh->ax25 = NULL; | |
729 | ax25_cb_put(ax25); | |
730 | ||
731 | if (++nr_neigh->failed < sysctl_netrom_link_fails_count) { | |
732 | nr_neigh_put(nr_neigh); | |
733 | return; | |
734 | } | |
735 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 736 | nr_node_for_each(nr_node, &nr_node_list) { |
1da177e4 | 737 | nr_node_lock(nr_node); |
52383678 RB |
738 | if (nr_node->which < nr_node->count && |
739 | nr_node->routes[nr_node->which].neighbour == nr_neigh) | |
1da177e4 LT |
740 | nr_node->which++; |
741 | nr_node_unlock(nr_node); | |
52383678 | 742 | } |
1da177e4 LT |
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 | */ | |
751 | int 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 | ||
58bc5747 RB |
766 | if (ax25 != NULL) { |
767 | ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat, | |
5f8f59d6 YH |
768 | ax25->ax25_dev->dev, 0, |
769 | sysctl_netrom_obsolescence_count_initialiser); | |
58bc5747 RB |
770 | if (ret) |
771 | return ret; | |
772 | } | |
1da177e4 LT |
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 (!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 | ||
d00c362f JP |
826 | ax25s = nr_neigh->ax25; |
827 | nr_neigh->ax25 = ax25_send_frame(skb, 256, | |
c045ad2c | 828 | (const ax25_address *)dev->dev_addr, |
d00c362f JP |
829 | &nr_neigh->callsign, |
830 | nr_neigh->digipeat, nr_neigh->dev); | |
831 | if (ax25s) | |
1da177e4 | 832 | ax25_cb_put(ax25s); |
1da177e4 LT |
833 | |
834 | dev_put(dev); | |
835 | ret = (nr_neigh->ax25 != NULL); | |
836 | nr_node_unlock(nr_node); | |
837 | nr_node_put(nr_node); | |
58bc5747 | 838 | |
1da177e4 LT |
839 | return ret; |
840 | } | |
841 | ||
842 | #ifdef CONFIG_PROC_FS | |
843 | ||
844 | static void *nr_node_start(struct seq_file *seq, loff_t *pos) | |
5018adfd | 845 | __acquires(&nr_node_list_lock) |
1da177e4 | 846 | { |
5f8f59d6 | 847 | spin_lock_bh(&nr_node_list_lock); |
90dd7f5a | 848 | return seq_hlist_start_head(&nr_node_list, *pos); |
1da177e4 LT |
849 | } |
850 | ||
851 | static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos) | |
852 | { | |
90dd7f5a | 853 | return seq_hlist_next(v, &nr_node_list, pos); |
1da177e4 LT |
854 | } |
855 | ||
856 | static void nr_node_stop(struct seq_file *seq, void *v) | |
0eb713fb | 857 | __releases(&nr_node_list_lock) |
1da177e4 LT |
858 | { |
859 | spin_unlock_bh(&nr_node_list_lock); | |
860 | } | |
861 | ||
862 | static int nr_node_show(struct seq_file *seq, void *v) | |
863 | { | |
f75268cd | 864 | char buf[11]; |
1da177e4 LT |
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 { | |
90dd7f5a LZ |
871 | struct nr_node *nr_node = hlist_entry(v, struct nr_node, |
872 | node_node); | |
873 | ||
1da177e4 LT |
874 | nr_node_lock(nr_node); |
875 | seq_printf(seq, "%-9s %-7s %d %d", | |
f75268cd | 876 | ax2asc(buf, &nr_node->callsign), |
1da177e4 LT |
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 | ||
fddda2b7 | 894 | const struct seq_operations nr_node_seqops = { |
1da177e4 LT |
895 | .start = nr_node_start, |
896 | .next = nr_node_next, | |
897 | .stop = nr_node_stop, | |
898 | .show = nr_node_show, | |
899 | }; | |
900 | ||
1da177e4 | 901 | static void *nr_neigh_start(struct seq_file *seq, loff_t *pos) |
2d6b6acf | 902 | __acquires(&nr_neigh_list_lock) |
1da177e4 | 903 | { |
1da177e4 | 904 | spin_lock_bh(&nr_neigh_list_lock); |
90dd7f5a | 905 | return seq_hlist_start_head(&nr_neigh_list, *pos); |
1da177e4 LT |
906 | } |
907 | ||
908 | static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos) | |
909 | { | |
90dd7f5a | 910 | return seq_hlist_next(v, &nr_neigh_list, pos); |
1da177e4 LT |
911 | } |
912 | ||
913 | static void nr_neigh_stop(struct seq_file *seq, void *v) | |
be21139f | 914 | __releases(&nr_neigh_list_lock) |
1da177e4 LT |
915 | { |
916 | spin_unlock_bh(&nr_neigh_list_lock); | |
917 | } | |
918 | ||
919 | static int nr_neigh_show(struct seq_file *seq, void *v) | |
920 | { | |
f75268cd | 921 | char buf[11]; |
1da177e4 LT |
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 { | |
90dd7f5a | 927 | struct nr_neigh *nr_neigh; |
1da177e4 | 928 | |
90dd7f5a | 929 | nr_neigh = hlist_entry(v, struct nr_neigh, neigh_node); |
1da177e4 LT |
930 | seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d", |
931 | nr_neigh->number, | |
f75268cd | 932 | ax2asc(buf, &nr_neigh->callsign), |
1da177e4 LT |
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++) | |
5f8f59d6 | 941 | seq_printf(seq, " %s", |
f75268cd | 942 | ax2asc(buf, &nr_neigh->digipeat->calls[i])); |
1da177e4 LT |
943 | } |
944 | ||
945 | seq_puts(seq, "\n"); | |
946 | } | |
947 | return 0; | |
948 | } | |
949 | ||
fddda2b7 | 950 | const struct seq_operations nr_neigh_seqops = { |
1da177e4 LT |
951 | .start = nr_neigh_start, |
952 | .next = nr_neigh_next, | |
953 | .stop = nr_neigh_stop, | |
954 | .show = nr_neigh_show, | |
955 | }; | |
1da177e4 LT |
956 | #endif |
957 | ||
958 | /* | |
959 | * Free all memory associated with the nodes and routes lists. | |
960 | */ | |
d3706566 | 961 | void nr_rt_free(void) |
1da177e4 LT |
962 | { |
963 | struct nr_neigh *s = NULL; | |
964 | struct nr_node *t = NULL; | |
b67bfe0d | 965 | struct hlist_node *nodet; |
1da177e4 LT |
966 | |
967 | spin_lock_bh(&nr_neigh_list_lock); | |
968 | spin_lock_bh(&nr_node_list_lock); | |
b67bfe0d | 969 | nr_node_for_each_safe(t, nodet, &nr_node_list) { |
1da177e4 LT |
970 | nr_node_lock(t); |
971 | nr_remove_node_locked(t); | |
972 | nr_node_unlock(t); | |
973 | } | |
b67bfe0d | 974 | nr_neigh_for_each_safe(s, nodet, &nr_neigh_list) { |
1da177e4 LT |
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 | } |