Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * X.25 Packet Layer release 002 | |
3 | * | |
4 | * This is ALPHA test software. This code may break your machine, | |
5 | * randomly fail to work with new releases, misbehave and/or generally | |
f8e1d201 | 6 | * screw up. It might even work. |
1da177e4 LT |
7 | * |
8 | * This code REQUIRES 2.1.15 or higher | |
9 | * | |
10 | * This module: | |
11 | * This module is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * History | |
17 | * X.25 001 Jonathan Naylor Started coding. | |
18 | * X.25 002 Jonathan Naylor New timer architecture. | |
f8e1d201 | 19 | * mar/20/00 Daniela Squassoni Disabling/enabling of facilities |
1da177e4 LT |
20 | * negotiation. |
21 | * 2000-09-04 Henner Eisen dev_hold() / dev_put() for x25_neigh. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/timer.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
1da177e4 LT |
28 | #include <linux/netdevice.h> |
29 | #include <linux/skbuff.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/init.h> | |
32 | #include <net/x25.h> | |
33 | ||
5595a1a5 | 34 | LIST_HEAD(x25_neigh_list); |
35 | DEFINE_RWLOCK(x25_neigh_list_lock); | |
1da177e4 LT |
36 | |
37 | static void x25_t20timer_expiry(unsigned long); | |
38 | ||
39 | static void x25_transmit_restart_confirmation(struct x25_neigh *nb); | |
40 | static void x25_transmit_restart_request(struct x25_neigh *nb); | |
41 | ||
42 | /* | |
43 | * Linux set/reset timer routines | |
44 | */ | |
45 | static inline void x25_start_t20timer(struct x25_neigh *nb) | |
46 | { | |
47 | mod_timer(&nb->t20timer, jiffies + nb->t20); | |
48 | } | |
49 | ||
50 | static void x25_t20timer_expiry(unsigned long param) | |
51 | { | |
52 | struct x25_neigh *nb = (struct x25_neigh *)param; | |
53 | ||
54 | x25_transmit_restart_request(nb); | |
55 | ||
56 | x25_start_t20timer(nb); | |
57 | } | |
58 | ||
59 | static inline void x25_stop_t20timer(struct x25_neigh *nb) | |
60 | { | |
61 | del_timer(&nb->t20timer); | |
62 | } | |
63 | ||
64 | static inline int x25_t20timer_pending(struct x25_neigh *nb) | |
65 | { | |
66 | return timer_pending(&nb->t20timer); | |
67 | } | |
68 | ||
69 | /* | |
70 | * This handles all restart and diagnostic frames. | |
71 | */ | |
72 | void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb, | |
73 | unsigned short frametype) | |
74 | { | |
75 | struct sk_buff *skbn; | |
76 | int confirm; | |
77 | ||
78 | switch (frametype) { | |
fddc5f3e JP |
79 | case X25_RESTART_REQUEST: |
80 | confirm = !x25_t20timer_pending(nb); | |
81 | x25_stop_t20timer(nb); | |
82 | nb->state = X25_LINK_STATE_3; | |
83 | if (confirm) | |
84 | x25_transmit_restart_confirmation(nb); | |
85 | break; | |
86 | ||
87 | case X25_RESTART_CONFIRMATION: | |
88 | x25_stop_t20timer(nb); | |
89 | nb->state = X25_LINK_STATE_3; | |
90 | break; | |
91 | ||
92 | case X25_DIAGNOSTIC: | |
cb101ed2 MD |
93 | if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 4)) |
94 | break; | |
95 | ||
fddc5f3e JP |
96 | printk(KERN_WARNING "x25: diagnostic #%d - %02X %02X %02X\n", |
97 | skb->data[3], skb->data[4], | |
98 | skb->data[5], skb->data[6]); | |
99 | break; | |
100 | ||
101 | default: | |
102 | printk(KERN_WARNING "x25: received unknown %02X with LCI 000\n", | |
103 | frametype); | |
104 | break; | |
1da177e4 LT |
105 | } |
106 | ||
107 | if (nb->state == X25_LINK_STATE_3) | |
108 | while ((skbn = skb_dequeue(&nb->queue)) != NULL) | |
109 | x25_send_frame(skbn, nb); | |
110 | } | |
111 | ||
112 | /* | |
113 | * This routine is called when a Restart Request is needed | |
114 | */ | |
115 | static void x25_transmit_restart_request(struct x25_neigh *nb) | |
116 | { | |
117 | unsigned char *dptr; | |
118 | int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2; | |
119 | struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); | |
120 | ||
121 | if (!skb) | |
122 | return; | |
123 | ||
124 | skb_reserve(skb, X25_MAX_L2_LEN); | |
125 | ||
126 | dptr = skb_put(skb, X25_STD_MIN_LEN + 2); | |
127 | ||
128 | *dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ; | |
129 | *dptr++ = 0x00; | |
130 | *dptr++ = X25_RESTART_REQUEST; | |
131 | *dptr++ = 0x00; | |
132 | *dptr++ = 0; | |
133 | ||
134 | skb->sk = NULL; | |
135 | ||
136 | x25_send_frame(skb, nb); | |
137 | } | |
138 | ||
139 | /* | |
140 | * This routine is called when a Restart Confirmation is needed | |
141 | */ | |
142 | static void x25_transmit_restart_confirmation(struct x25_neigh *nb) | |
143 | { | |
144 | unsigned char *dptr; | |
145 | int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN; | |
146 | struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); | |
147 | ||
148 | if (!skb) | |
149 | return; | |
150 | ||
151 | skb_reserve(skb, X25_MAX_L2_LEN); | |
152 | ||
153 | dptr = skb_put(skb, X25_STD_MIN_LEN); | |
154 | ||
155 | *dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ; | |
156 | *dptr++ = 0x00; | |
157 | *dptr++ = X25_RESTART_CONFIRMATION; | |
158 | ||
159 | skb->sk = NULL; | |
160 | ||
161 | x25_send_frame(skb, nb); | |
162 | } | |
163 | ||
164 | /* | |
165 | * This routine is called when a Clear Request is needed outside of the context | |
166 | * of a connected socket. | |
167 | */ | |
168 | void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci, | |
169 | unsigned char cause) | |
170 | { | |
171 | unsigned char *dptr; | |
172 | int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2; | |
173 | struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC); | |
174 | ||
175 | if (!skb) | |
176 | return; | |
177 | ||
178 | skb_reserve(skb, X25_MAX_L2_LEN); | |
179 | ||
180 | dptr = skb_put(skb, X25_STD_MIN_LEN + 2); | |
181 | ||
182 | *dptr++ = ((lci >> 8) & 0x0F) | (nb->extended ? | |
183 | X25_GFI_EXTSEQ : | |
184 | X25_GFI_STDSEQ); | |
185 | *dptr++ = (lci >> 0) & 0xFF; | |
186 | *dptr++ = X25_CLEAR_REQUEST; | |
187 | *dptr++ = cause; | |
188 | *dptr++ = 0x00; | |
189 | ||
190 | skb->sk = NULL; | |
191 | ||
192 | x25_send_frame(skb, nb); | |
193 | } | |
194 | ||
195 | void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb) | |
196 | { | |
197 | switch (nb->state) { | |
fddc5f3e JP |
198 | case X25_LINK_STATE_0: |
199 | skb_queue_tail(&nb->queue, skb); | |
200 | nb->state = X25_LINK_STATE_1; | |
201 | x25_establish_link(nb); | |
202 | break; | |
203 | case X25_LINK_STATE_1: | |
204 | case X25_LINK_STATE_2: | |
205 | skb_queue_tail(&nb->queue, skb); | |
206 | break; | |
207 | case X25_LINK_STATE_3: | |
208 | x25_send_frame(skb, nb); | |
209 | break; | |
1da177e4 LT |
210 | } |
211 | } | |
212 | ||
213 | /* | |
214 | * Called when the link layer has become established. | |
215 | */ | |
216 | void x25_link_established(struct x25_neigh *nb) | |
217 | { | |
218 | switch (nb->state) { | |
fddc5f3e JP |
219 | case X25_LINK_STATE_0: |
220 | nb->state = X25_LINK_STATE_2; | |
221 | break; | |
222 | case X25_LINK_STATE_1: | |
223 | x25_transmit_restart_request(nb); | |
224 | nb->state = X25_LINK_STATE_2; | |
225 | x25_start_t20timer(nb); | |
226 | break; | |
1da177e4 LT |
227 | } |
228 | } | |
229 | ||
230 | /* | |
231 | * Called when the link layer has terminated, or an establishment | |
232 | * request has failed. | |
233 | */ | |
234 | ||
235 | void x25_link_terminated(struct x25_neigh *nb) | |
236 | { | |
237 | nb->state = X25_LINK_STATE_0; | |
238 | /* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */ | |
239 | x25_kill_by_neigh(nb); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Add a new device. | |
244 | */ | |
245 | void x25_link_device_up(struct net_device *dev) | |
246 | { | |
247 | struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC); | |
248 | ||
249 | if (!nb) | |
250 | return; | |
251 | ||
252 | skb_queue_head_init(&nb->queue); | |
b24b8a24 | 253 | setup_timer(&nb->t20timer, x25_t20timer_expiry, (unsigned long)nb); |
1da177e4 LT |
254 | |
255 | dev_hold(dev); | |
256 | nb->dev = dev; | |
257 | nb->state = X25_LINK_STATE_0; | |
258 | nb->extended = 0; | |
259 | /* | |
260 | * Enables negotiation | |
261 | */ | |
262 | nb->global_facil_mask = X25_MASK_REVERSE | | |
263 | X25_MASK_THROUGHPUT | | |
264 | X25_MASK_PACKET_SIZE | | |
265 | X25_MASK_WINDOW_SIZE; | |
266 | nb->t20 = sysctl_x25_restart_request_timeout; | |
267 | atomic_set(&nb->refcnt, 1); | |
268 | ||
269 | write_lock_bh(&x25_neigh_list_lock); | |
270 | list_add(&nb->node, &x25_neigh_list); | |
271 | write_unlock_bh(&x25_neigh_list_lock); | |
272 | } | |
273 | ||
274 | /** | |
275 | * __x25_remove_neigh - remove neighbour from x25_neigh_list | |
276 | * @nb - neigh to remove | |
277 | * | |
278 | * Remove neighbour from x25_neigh_list. If it was there. | |
279 | * Caller must hold x25_neigh_list_lock. | |
280 | */ | |
281 | static void __x25_remove_neigh(struct x25_neigh *nb) | |
282 | { | |
283 | skb_queue_purge(&nb->queue); | |
284 | x25_stop_t20timer(nb); | |
285 | ||
286 | if (nb->node.next) { | |
287 | list_del(&nb->node); | |
288 | x25_neigh_put(nb); | |
289 | } | |
290 | } | |
291 | ||
292 | /* | |
293 | * A device has been removed, remove its links. | |
294 | */ | |
295 | void x25_link_device_down(struct net_device *dev) | |
296 | { | |
297 | struct x25_neigh *nb; | |
298 | struct list_head *entry, *tmp; | |
299 | ||
300 | write_lock_bh(&x25_neigh_list_lock); | |
301 | ||
302 | list_for_each_safe(entry, tmp, &x25_neigh_list) { | |
303 | nb = list_entry(entry, struct x25_neigh, node); | |
304 | ||
305 | if (nb->dev == dev) { | |
306 | __x25_remove_neigh(nb); | |
307 | dev_put(dev); | |
308 | } | |
309 | } | |
310 | ||
311 | write_unlock_bh(&x25_neigh_list_lock); | |
312 | } | |
313 | ||
314 | /* | |
315 | * Given a device, return the neighbour address. | |
316 | */ | |
317 | struct x25_neigh *x25_get_neigh(struct net_device *dev) | |
318 | { | |
319 | struct x25_neigh *nb, *use = NULL; | |
320 | struct list_head *entry; | |
321 | ||
322 | read_lock_bh(&x25_neigh_list_lock); | |
323 | list_for_each(entry, &x25_neigh_list) { | |
324 | nb = list_entry(entry, struct x25_neigh, node); | |
325 | ||
326 | if (nb->dev == dev) { | |
327 | use = nb; | |
328 | break; | |
329 | } | |
330 | } | |
331 | ||
332 | if (use) | |
333 | x25_neigh_hold(use); | |
334 | read_unlock_bh(&x25_neigh_list_lock); | |
335 | return use; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Handle the ioctls that control the subscription functions. | |
340 | */ | |
341 | int x25_subscr_ioctl(unsigned int cmd, void __user *arg) | |
342 | { | |
343 | struct x25_subscrip_struct x25_subscr; | |
344 | struct x25_neigh *nb; | |
345 | struct net_device *dev; | |
346 | int rc = -EINVAL; | |
347 | ||
348 | if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP) | |
349 | goto out; | |
350 | ||
351 | rc = -EFAULT; | |
352 | if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr))) | |
353 | goto out; | |
354 | ||
355 | rc = -EINVAL; | |
356 | if ((dev = x25_dev_get(x25_subscr.device)) == NULL) | |
357 | goto out; | |
358 | ||
359 | if ((nb = x25_get_neigh(dev)) == NULL) | |
360 | goto out_dev_put; | |
361 | ||
362 | dev_put(dev); | |
363 | ||
364 | if (cmd == SIOCX25GSUBSCRIP) { | |
5595a1a5 | 365 | read_lock_bh(&x25_neigh_list_lock); |
1da177e4 LT |
366 | x25_subscr.extended = nb->extended; |
367 | x25_subscr.global_facil_mask = nb->global_facil_mask; | |
5595a1a5 | 368 | read_unlock_bh(&x25_neigh_list_lock); |
1da177e4 LT |
369 | rc = copy_to_user(arg, &x25_subscr, |
370 | sizeof(x25_subscr)) ? -EFAULT : 0; | |
371 | } else { | |
372 | rc = -EINVAL; | |
373 | if (!(x25_subscr.extended && x25_subscr.extended != 1)) { | |
374 | rc = 0; | |
5595a1a5 | 375 | write_lock_bh(&x25_neigh_list_lock); |
1da177e4 LT |
376 | nb->extended = x25_subscr.extended; |
377 | nb->global_facil_mask = x25_subscr.global_facil_mask; | |
5595a1a5 | 378 | write_unlock_bh(&x25_neigh_list_lock); |
1da177e4 LT |
379 | } |
380 | } | |
381 | x25_neigh_put(nb); | |
382 | out: | |
383 | return rc; | |
384 | out_dev_put: | |
385 | dev_put(dev); | |
386 | goto out; | |
387 | } | |
388 | ||
389 | ||
390 | /* | |
391 | * Release all memory associated with X.25 neighbour structures. | |
392 | */ | |
393 | void __exit x25_link_free(void) | |
394 | { | |
395 | struct x25_neigh *nb; | |
396 | struct list_head *entry, *tmp; | |
397 | ||
398 | write_lock_bh(&x25_neigh_list_lock); | |
399 | ||
400 | list_for_each_safe(entry, tmp, &x25_neigh_list) { | |
96642d42 DM |
401 | struct net_device *dev; |
402 | ||
1da177e4 | 403 | nb = list_entry(entry, struct x25_neigh, node); |
96642d42 | 404 | dev = nb->dev; |
1da177e4 | 405 | __x25_remove_neigh(nb); |
96642d42 | 406 | dev_put(dev); |
1da177e4 LT |
407 | } |
408 | write_unlock_bh(&x25_neigh_list_lock); | |
409 | } |