Commit | Line | Data |
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1da177e4 LT |
1 | /* net/atm/pppoatm.c - RFC2364 PPP over ATM/AAL5 */ |
2 | ||
3 | /* Copyright 1999-2000 by Mitchell Blank Jr */ | |
4 | /* Based on clip.c; 1995-1999 by Werner Almesberger, EPFL LRC/ICA */ | |
5 | /* And on ppp_async.c; Copyright 1999 Paul Mackerras */ | |
6 | /* And help from Jens Axboe */ | |
7 | ||
8 | /* | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This driver provides the encapsulation and framing for sending | |
15 | * and receiving PPP frames in ATM AAL5 PDUs. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * One shortcoming of this driver is that it does not comply with | |
20 | * section 8 of RFC2364 - we are supposed to detect a change | |
21 | * in encapsulation and immediately abort the connection (in order | |
22 | * to avoid a black-hole being created if our peer loses state | |
23 | * and changes encapsulation unilaterally. However, since the | |
24 | * ppp_generic layer actually does the decapsulation, we need | |
25 | * a way of notifying it when we _think_ there might be a problem) | |
26 | * There's two cases: | |
27 | * 1. LLC-encapsulation was missing when it was enabled. In | |
28 | * this case, we should tell the upper layer "tear down | |
29 | * this session if this skb looks ok to you" | |
30 | * 2. LLC-encapsulation was present when it was disabled. Then | |
31 | * we need to tell the upper layer "this packet may be | |
32 | * ok, but if its in error tear down the session" | |
33 | * These hooks are not yet available in ppp_generic | |
34 | */ | |
35 | ||
99824461 JP |
36 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
37 | ||
1da177e4 | 38 | #include <linux/module.h> |
1da177e4 | 39 | #include <linux/init.h> |
a6b7a407 | 40 | #include <linux/interrupt.h> |
1da177e4 | 41 | #include <linux/skbuff.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
1da177e4 LT |
43 | #include <linux/atm.h> |
44 | #include <linux/atmdev.h> | |
4fc268d2 | 45 | #include <linux/capability.h> |
1da177e4 | 46 | #include <linux/ppp_defs.h> |
4b32da2b | 47 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
48 | #include <linux/ppp_channel.h> |
49 | #include <linux/atmppp.h> | |
50 | ||
51 | #include "common.h" | |
52 | ||
1da177e4 LT |
53 | enum pppoatm_encaps { |
54 | e_autodetect = PPPOATM_ENCAPS_AUTODETECT, | |
55 | e_vc = PPPOATM_ENCAPS_VC, | |
56 | e_llc = PPPOATM_ENCAPS_LLC, | |
57 | }; | |
58 | ||
59 | struct pppoatm_vcc { | |
60 | struct atm_vcc *atmvcc; /* VCC descriptor */ | |
61 | void (*old_push)(struct atm_vcc *, struct sk_buff *); | |
62 | void (*old_pop)(struct atm_vcc *, struct sk_buff *); | |
0e56d99a | 63 | void (*old_release_cb)(struct atm_vcc *); |
e41faed9 | 64 | struct module *old_owner; |
1da177e4 LT |
65 | /* keep old push/pop for detaching */ |
66 | enum pppoatm_encaps encaps; | |
9d02daf7 DW |
67 | atomic_t inflight; |
68 | unsigned long blocked; | |
1da177e4 LT |
69 | int flags; /* SC_COMP_PROT - compress protocol */ |
70 | struct ppp_channel chan; /* interface to generic ppp layer */ | |
71 | struct tasklet_struct wakeup_tasklet; | |
72 | }; | |
73 | ||
9d02daf7 DW |
74 | /* |
75 | * We want to allow two packets in the queue. The one that's currently in | |
76 | * flight, and *one* queued up ready for the ATM device to send immediately | |
77 | * from its TX done IRQ. We want to be able to use atomic_inc_not_zero(), so | |
78 | * inflight == -2 represents an empty queue, -1 one packet, and zero means | |
79 | * there are two packets in the queue. | |
80 | */ | |
81 | #define NONE_INFLIGHT -2 | |
82 | ||
83 | #define BLOCKED 0 | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * Header used for LLC Encapsulated PPP (4 bytes) followed by the LCP protocol | |
87 | * ID (0xC021) used in autodetection | |
88 | */ | |
89 | static const unsigned char pppllc[6] = { 0xFE, 0xFE, 0x03, 0xCF, 0xC0, 0x21 }; | |
90 | #define LLC_LEN (4) | |
91 | ||
92 | static inline struct pppoatm_vcc *atmvcc_to_pvcc(const struct atm_vcc *atmvcc) | |
93 | { | |
94 | return (struct pppoatm_vcc *) (atmvcc->user_back); | |
95 | } | |
96 | ||
97 | static inline struct pppoatm_vcc *chan_to_pvcc(const struct ppp_channel *chan) | |
98 | { | |
99 | return (struct pppoatm_vcc *) (chan->private); | |
100 | } | |
101 | ||
102 | /* | |
103 | * We can't do this directly from our _pop handler, since the ppp code | |
104 | * doesn't want to be called in interrupt context, so we do it from | |
105 | * a tasklet | |
106 | */ | |
107 | static void pppoatm_wakeup_sender(unsigned long arg) | |
108 | { | |
109 | ppp_output_wakeup((struct ppp_channel *) arg); | |
110 | } | |
111 | ||
0e56d99a DW |
112 | static void pppoatm_release_cb(struct atm_vcc *atmvcc) |
113 | { | |
114 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
115 | ||
116 | tasklet_schedule(&pvcc->wakeup_tasklet); | |
117 | if (pvcc->old_release_cb) | |
118 | pvcc->old_release_cb(atmvcc); | |
119 | } | |
1da177e4 LT |
120 | /* |
121 | * This gets called every time the ATM card has finished sending our | |
122 | * skb. The ->old_pop will take care up normal atm flow control, | |
123 | * but we also need to wake up the device if we blocked it | |
124 | */ | |
125 | static void pppoatm_pop(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
126 | { | |
127 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
9d02daf7 | 128 | |
1da177e4 | 129 | pvcc->old_pop(atmvcc, skb); |
9d02daf7 DW |
130 | atomic_dec(&pvcc->inflight); |
131 | ||
1da177e4 | 132 | /* |
9d02daf7 DW |
133 | * We always used to run the wakeup tasklet unconditionally here, for |
134 | * fear of race conditions where we clear the BLOCKED flag just as we | |
135 | * refuse another packet in pppoatm_send(). This was quite inefficient. | |
136 | * | |
137 | * In fact it's OK. The PPP core will only ever call pppoatm_send() | |
138 | * while holding the channel->downl lock. And ppp_output_wakeup() as | |
139 | * called by the tasklet will *also* grab that lock. So even if another | |
140 | * CPU is in pppoatm_send() right now, the tasklet isn't going to race | |
141 | * with it. The wakeup *will* happen after the other CPU is safely out | |
142 | * of pppoatm_send() again. | |
143 | * | |
144 | * So if the CPU in pppoatm_send() has already set the BLOCKED bit and | |
145 | * it about to return, that's fine. We trigger a wakeup which will | |
146 | * happen later. And if the CPU in pppoatm_send() *hasn't* set the | |
147 | * BLOCKED bit yet, that's fine too because of the double check in | |
148 | * pppoatm_may_send() which is commented there. | |
1da177e4 | 149 | */ |
9d02daf7 DW |
150 | if (test_and_clear_bit(BLOCKED, &pvcc->blocked)) |
151 | tasklet_schedule(&pvcc->wakeup_tasklet); | |
1da177e4 LT |
152 | } |
153 | ||
154 | /* | |
155 | * Unbind from PPP - currently we only do this when closing the socket, | |
156 | * but we could put this into an ioctl if need be | |
157 | */ | |
158 | static void pppoatm_unassign_vcc(struct atm_vcc *atmvcc) | |
159 | { | |
160 | struct pppoatm_vcc *pvcc; | |
161 | pvcc = atmvcc_to_pvcc(atmvcc); | |
162 | atmvcc->push = pvcc->old_push; | |
163 | atmvcc->pop = pvcc->old_pop; | |
0e56d99a | 164 | atmvcc->release_cb = pvcc->old_release_cb; |
1da177e4 LT |
165 | tasklet_kill(&pvcc->wakeup_tasklet); |
166 | ppp_unregister_channel(&pvcc->chan); | |
167 | atmvcc->user_back = NULL; | |
168 | kfree(pvcc); | |
1da177e4 LT |
169 | } |
170 | ||
171 | /* Called when an AAL5 PDU comes in */ | |
172 | static void pppoatm_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
173 | { | |
174 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
99824461 | 175 | pr_debug("\n"); |
1da177e4 | 176 | if (skb == NULL) { /* VCC was closed */ |
e41faed9 KM |
177 | struct module *module; |
178 | ||
52240062 | 179 | pr_debug("removing ATMPPP VCC %p\n", pvcc); |
e41faed9 | 180 | module = pvcc->old_owner; |
1da177e4 LT |
181 | pppoatm_unassign_vcc(atmvcc); |
182 | atmvcc->push(atmvcc, NULL); /* Pass along bad news */ | |
e41faed9 | 183 | module_put(module); |
1da177e4 LT |
184 | return; |
185 | } | |
186 | atm_return(atmvcc, skb->truesize); | |
187 | switch (pvcc->encaps) { | |
188 | case e_llc: | |
189 | if (skb->len < LLC_LEN || | |
190 | memcmp(skb->data, pppllc, LLC_LEN)) | |
191 | goto error; | |
192 | skb_pull(skb, LLC_LEN); | |
193 | break; | |
194 | case e_autodetect: | |
195 | if (pvcc->chan.ppp == NULL) { /* Not bound yet! */ | |
196 | kfree_skb(skb); | |
197 | return; | |
198 | } | |
199 | if (skb->len >= sizeof(pppllc) && | |
200 | !memcmp(skb->data, pppllc, sizeof(pppllc))) { | |
201 | pvcc->encaps = e_llc; | |
202 | skb_pull(skb, LLC_LEN); | |
203 | break; | |
204 | } | |
205 | if (skb->len >= (sizeof(pppllc) - LLC_LEN) && | |
206 | !memcmp(skb->data, &pppllc[LLC_LEN], | |
207 | sizeof(pppllc) - LLC_LEN)) { | |
208 | pvcc->encaps = e_vc; | |
209 | pvcc->chan.mtu += LLC_LEN; | |
210 | break; | |
211 | } | |
99824461 JP |
212 | pr_debug("Couldn't autodetect yet (skb: %02X %02X %02X %02X %02X %02X)\n", |
213 | skb->data[0], skb->data[1], skb->data[2], | |
214 | skb->data[3], skb->data[4], skb->data[5]); | |
1da177e4 LT |
215 | goto error; |
216 | case e_vc: | |
217 | break; | |
218 | } | |
219 | ppp_input(&pvcc->chan, skb); | |
220 | return; | |
d81219db JP |
221 | |
222 | error: | |
1da177e4 LT |
223 | kfree_skb(skb); |
224 | ppp_input_error(&pvcc->chan, 0); | |
225 | } | |
226 | ||
397ff16d | 227 | static int pppoatm_may_send(struct pppoatm_vcc *pvcc, int size) |
9d02daf7 DW |
228 | { |
229 | /* | |
230 | * It's not clear that we need to bother with using atm_may_send() | |
231 | * to check we don't exceed sk->sk_sndbuf. If userspace sets a | |
232 | * value of sk_sndbuf which is lower than the MTU, we're going to | |
233 | * block for ever. But the code always did that before we introduced | |
234 | * the packet count limit, so... | |
235 | */ | |
236 | if (atm_may_send(pvcc->atmvcc, size) && | |
237 | atomic_inc_not_zero_hint(&pvcc->inflight, NONE_INFLIGHT)) | |
238 | return 1; | |
239 | ||
240 | /* | |
241 | * We use test_and_set_bit() rather than set_bit() here because | |
242 | * we need to ensure there's a memory barrier after it. The bit | |
243 | * *must* be set before we do the atomic_inc() on pvcc->inflight. | |
244 | * There's no smp_mb__after_set_bit(), so it's this or abuse | |
245 | * smp_mb__after_clear_bit(). | |
246 | */ | |
247 | test_and_set_bit(BLOCKED, &pvcc->blocked); | |
248 | ||
249 | /* | |
250 | * We may have raced with pppoatm_pop(). If it ran for the | |
251 | * last packet in the queue, *just* before we set the BLOCKED | |
252 | * bit, then it might never run again and the channel could | |
253 | * remain permanently blocked. Cope with that race by checking | |
254 | * *again*. If it did run in that window, we'll have space on | |
255 | * the queue now and can return success. It's harmless to leave | |
256 | * the BLOCKED flag set, since it's only used as a trigger to | |
257 | * run the wakeup tasklet. Another wakeup will never hurt. | |
258 | * If pppoatm_pop() is running but hasn't got as far as making | |
259 | * space on the queue yet, then it hasn't checked the BLOCKED | |
260 | * flag yet either, so we're safe in that case too. It'll issue | |
261 | * an "immediate" wakeup... where "immediate" actually involves | |
262 | * taking the PPP channel's ->downl lock, which is held by the | |
263 | * code path that calls pppoatm_send(), and is thus going to | |
264 | * wait for us to finish. | |
265 | */ | |
266 | if (atm_may_send(pvcc->atmvcc, size) && | |
267 | atomic_inc_not_zero(&pvcc->inflight)) | |
268 | return 1; | |
269 | ||
270 | return 0; | |
271 | } | |
1da177e4 LT |
272 | /* |
273 | * Called by the ppp_generic.c to send a packet - returns true if packet | |
274 | * was accepted. If we return false, then it's our job to call | |
275 | * ppp_output_wakeup(chan) when we're feeling more up to it. | |
276 | * Note that in the ENOMEM case (as opposed to the !atm_may_send case) | |
277 | * we should really drop the packet, but the generic layer doesn't | |
278 | * support this yet. We just return 'DROP_PACKET' which we actually define | |
279 | * as success, just to be clear what we're really doing. | |
280 | */ | |
281 | #define DROP_PACKET 1 | |
282 | static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb) | |
283 | { | |
284 | struct pppoatm_vcc *pvcc = chan_to_pvcc(chan); | |
3ac10800 KM |
285 | struct atm_vcc *vcc; |
286 | int ret; | |
287 | ||
1da177e4 | 288 | ATM_SKB(skb)->vcc = pvcc->atmvcc; |
99824461 | 289 | pr_debug("(skb=0x%p, vcc=0x%p)\n", skb, pvcc->atmvcc); |
1da177e4 LT |
290 | if (skb->data[0] == '\0' && (pvcc->flags & SC_COMP_PROT)) |
291 | (void) skb_pull(skb, 1); | |
3ac10800 KM |
292 | |
293 | vcc = ATM_SKB(skb)->vcc; | |
294 | bh_lock_sock(sk_atm(vcc)); | |
295 | if (sock_owned_by_user(sk_atm(vcc))) | |
296 | goto nospace; | |
071d9393 KM |
297 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
298 | test_bit(ATM_VF_CLOSE, &vcc->flags) || | |
299 | !test_bit(ATM_VF_READY, &vcc->flags)) { | |
300 | bh_unlock_sock(sk_atm(vcc)); | |
301 | kfree_skb(skb); | |
302 | return DROP_PACKET; | |
303 | } | |
3ac10800 | 304 | |
1da177e4 LT |
305 | switch (pvcc->encaps) { /* LLC encapsulation needed */ |
306 | case e_llc: | |
307 | if (skb_headroom(skb) < LLC_LEN) { | |
308 | struct sk_buff *n; | |
309 | n = skb_realloc_headroom(skb, LLC_LEN); | |
310 | if (n != NULL && | |
9d02daf7 | 311 | !pppoatm_may_send(pvcc, n->truesize)) { |
1da177e4 LT |
312 | kfree_skb(n); |
313 | goto nospace; | |
314 | } | |
5d0ba55b | 315 | consume_skb(skb); |
d81219db | 316 | skb = n; |
3ac10800 KM |
317 | if (skb == NULL) { |
318 | bh_unlock_sock(sk_atm(vcc)); | |
1da177e4 | 319 | return DROP_PACKET; |
3ac10800 | 320 | } |
9d02daf7 | 321 | } else if (!pppoatm_may_send(pvcc, skb->truesize)) |
1da177e4 LT |
322 | goto nospace; |
323 | memcpy(skb_push(skb, LLC_LEN), pppllc, LLC_LEN); | |
324 | break; | |
325 | case e_vc: | |
9d02daf7 | 326 | if (!pppoatm_may_send(pvcc, skb->truesize)) |
1da177e4 LT |
327 | goto nospace; |
328 | break; | |
329 | case e_autodetect: | |
3ac10800 | 330 | bh_unlock_sock(sk_atm(vcc)); |
52240062 | 331 | pr_debug("Trying to send without setting encaps!\n"); |
1da177e4 LT |
332 | kfree_skb(skb); |
333 | return 1; | |
334 | } | |
335 | ||
336 | atomic_add(skb->truesize, &sk_atm(ATM_SKB(skb)->vcc)->sk_wmem_alloc); | |
337 | ATM_SKB(skb)->atm_options = ATM_SKB(skb)->vcc->atm_options; | |
99824461 JP |
338 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", |
339 | skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev); | |
3ac10800 | 340 | ret = ATM_SKB(skb)->vcc->send(ATM_SKB(skb)->vcc, skb) |
1da177e4 | 341 | ? DROP_PACKET : 1; |
3ac10800 KM |
342 | bh_unlock_sock(sk_atm(vcc)); |
343 | return ret; | |
d81219db | 344 | nospace: |
3ac10800 | 345 | bh_unlock_sock(sk_atm(vcc)); |
1da177e4 LT |
346 | /* |
347 | * We don't have space to send this SKB now, but we might have | |
348 | * already applied SC_COMP_PROT compression, so may need to undo | |
349 | */ | |
350 | if ((pvcc->flags & SC_COMP_PROT) && skb_headroom(skb) > 0 && | |
351 | skb->data[-1] == '\0') | |
352 | (void) skb_push(skb, 1); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | /* This handles ioctls sent to the /dev/ppp interface */ | |
357 | static int pppoatm_devppp_ioctl(struct ppp_channel *chan, unsigned int cmd, | |
358 | unsigned long arg) | |
359 | { | |
360 | switch (cmd) { | |
361 | case PPPIOCGFLAGS: | |
362 | return put_user(chan_to_pvcc(chan)->flags, (int __user *) arg) | |
363 | ? -EFAULT : 0; | |
364 | case PPPIOCSFLAGS: | |
365 | return get_user(chan_to_pvcc(chan)->flags, (int __user *) arg) | |
366 | ? -EFAULT : 0; | |
367 | } | |
368 | return -ENOTTY; | |
369 | } | |
370 | ||
d7100da0 | 371 | static const struct ppp_channel_ops pppoatm_ops = { |
1da177e4 LT |
372 | .start_xmit = pppoatm_send, |
373 | .ioctl = pppoatm_devppp_ioctl, | |
374 | }; | |
375 | ||
376 | static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg) | |
377 | { | |
378 | struct atm_backend_ppp be; | |
379 | struct pppoatm_vcc *pvcc; | |
380 | int err; | |
381 | /* | |
382 | * Each PPPoATM instance has its own tasklet - this is just a | |
383 | * prototypical one used to initialize them | |
384 | */ | |
385 | static const DECLARE_TASKLET(tasklet_proto, pppoatm_wakeup_sender, 0); | |
386 | if (copy_from_user(&be, arg, sizeof be)) | |
387 | return -EFAULT; | |
388 | if (be.encaps != PPPOATM_ENCAPS_AUTODETECT && | |
389 | be.encaps != PPPOATM_ENCAPS_VC && be.encaps != PPPOATM_ENCAPS_LLC) | |
390 | return -EINVAL; | |
0da974f4 | 391 | pvcc = kzalloc(sizeof(*pvcc), GFP_KERNEL); |
1da177e4 LT |
392 | if (pvcc == NULL) |
393 | return -ENOMEM; | |
1da177e4 | 394 | pvcc->atmvcc = atmvcc; |
9d02daf7 DW |
395 | |
396 | /* Maximum is zero, so that we can use atomic_inc_not_zero() */ | |
397 | atomic_set(&pvcc->inflight, NONE_INFLIGHT); | |
1da177e4 LT |
398 | pvcc->old_push = atmvcc->push; |
399 | pvcc->old_pop = atmvcc->pop; | |
e41faed9 | 400 | pvcc->old_owner = atmvcc->owner; |
0e56d99a | 401 | pvcc->old_release_cb = atmvcc->release_cb; |
1da177e4 LT |
402 | pvcc->encaps = (enum pppoatm_encaps) be.encaps; |
403 | pvcc->chan.private = pvcc; | |
404 | pvcc->chan.ops = &pppoatm_ops; | |
405 | pvcc->chan.mtu = atmvcc->qos.txtp.max_sdu - PPP_HDRLEN - | |
406 | (be.encaps == e_vc ? 0 : LLC_LEN); | |
407 | pvcc->wakeup_tasklet = tasklet_proto; | |
408 | pvcc->wakeup_tasklet.data = (unsigned long) &pvcc->chan; | |
d81219db JP |
409 | err = ppp_register_channel(&pvcc->chan); |
410 | if (err != 0) { | |
1da177e4 LT |
411 | kfree(pvcc); |
412 | return err; | |
413 | } | |
414 | atmvcc->user_back = pvcc; | |
415 | atmvcc->push = pppoatm_push; | |
416 | atmvcc->pop = pppoatm_pop; | |
0e56d99a | 417 | atmvcc->release_cb = pppoatm_release_cb; |
1da177e4 | 418 | __module_get(THIS_MODULE); |
e41faed9 | 419 | atmvcc->owner = THIS_MODULE; |
4e55f578 JBD |
420 | |
421 | /* re-process everything received between connection setup and | |
422 | backend setup */ | |
423 | vcc_process_recv_queue(atmvcc); | |
1da177e4 LT |
424 | return 0; |
425 | } | |
426 | ||
427 | /* | |
428 | * This handles ioctls actually performed on our vcc - we must return | |
429 | * -ENOIOCTLCMD for any unrecognized ioctl | |
430 | */ | |
431 | static int pppoatm_ioctl(struct socket *sock, unsigned int cmd, | |
432 | unsigned long arg) | |
433 | { | |
434 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
435 | void __user *argp = (void __user *)arg; | |
436 | ||
437 | if (cmd != ATM_SETBACKEND && atmvcc->push != pppoatm_push) | |
438 | return -ENOIOCTLCMD; | |
439 | switch (cmd) { | |
440 | case ATM_SETBACKEND: { | |
441 | atm_backend_t b; | |
442 | if (get_user(b, (atm_backend_t __user *) argp)) | |
443 | return -EFAULT; | |
444 | if (b != ATM_BACKEND_PPP) | |
445 | return -ENOIOCTLCMD; | |
446 | if (!capable(CAP_NET_ADMIN)) | |
447 | return -EPERM; | |
3b1a9145 KM |
448 | if (sock->state != SS_CONNECTED) |
449 | return -EINVAL; | |
1da177e4 LT |
450 | return pppoatm_assign_vcc(atmvcc, argp); |
451 | } | |
452 | case PPPIOCGCHAN: | |
453 | return put_user(ppp_channel_index(&atmvcc_to_pvcc(atmvcc)-> | |
454 | chan), (int __user *) argp) ? -EFAULT : 0; | |
455 | case PPPIOCGUNIT: | |
456 | return put_user(ppp_unit_number(&atmvcc_to_pvcc(atmvcc)-> | |
457 | chan), (int __user *) argp) ? -EFAULT : 0; | |
458 | } | |
459 | return -ENOIOCTLCMD; | |
460 | } | |
461 | ||
462 | static struct atm_ioctl pppoatm_ioctl_ops = { | |
463 | .owner = THIS_MODULE, | |
464 | .ioctl = pppoatm_ioctl, | |
465 | }; | |
466 | ||
467 | static int __init pppoatm_init(void) | |
468 | { | |
469 | register_atm_ioctl(&pppoatm_ioctl_ops); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static void __exit pppoatm_exit(void) | |
474 | { | |
475 | deregister_atm_ioctl(&pppoatm_ioctl_ops); | |
476 | } | |
477 | ||
478 | module_init(pppoatm_init); | |
479 | module_exit(pppoatm_exit); | |
480 | ||
481 | MODULE_AUTHOR("Mitchell Blank Jr <mitch@sfgoth.com>"); | |
482 | MODULE_DESCRIPTION("RFC2364 PPP over ATM/AAL5"); | |
483 | MODULE_LICENSE("GPL"); |