Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* net/atm/pppoatm.c - RFC2364 PPP over ATM/AAL5 */ |
3 | ||
4 | /* Copyright 1999-2000 by Mitchell Blank Jr */ | |
5 | /* Based on clip.c; 1995-1999 by Werner Almesberger, EPFL LRC/ICA */ | |
6 | /* And on ppp_async.c; Copyright 1999 Paul Mackerras */ | |
7 | /* And help from Jens Axboe */ | |
8 | ||
9 | /* | |
1da177e4 LT |
10 | * |
11 | * This driver provides the encapsulation and framing for sending | |
12 | * and receiving PPP frames in ATM AAL5 PDUs. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * One shortcoming of this driver is that it does not comply with | |
17 | * section 8 of RFC2364 - we are supposed to detect a change | |
18 | * in encapsulation and immediately abort the connection (in order | |
19 | * to avoid a black-hole being created if our peer loses state | |
20 | * and changes encapsulation unilaterally. However, since the | |
21 | * ppp_generic layer actually does the decapsulation, we need | |
22 | * a way of notifying it when we _think_ there might be a problem) | |
23 | * There's two cases: | |
24 | * 1. LLC-encapsulation was missing when it was enabled. In | |
25 | * this case, we should tell the upper layer "tear down | |
26 | * this session if this skb looks ok to you" | |
27 | * 2. LLC-encapsulation was present when it was disabled. Then | |
28 | * we need to tell the upper layer "this packet may be | |
29 | * ok, but if its in error tear down the session" | |
30 | * These hooks are not yet available in ppp_generic | |
31 | */ | |
32 | ||
99824461 JP |
33 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
34 | ||
1da177e4 | 35 | #include <linux/module.h> |
1da177e4 | 36 | #include <linux/init.h> |
a6b7a407 | 37 | #include <linux/interrupt.h> |
1da177e4 | 38 | #include <linux/skbuff.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #include <linux/atm.h> |
41 | #include <linux/atmdev.h> | |
4fc268d2 | 42 | #include <linux/capability.h> |
1da177e4 | 43 | #include <linux/ppp_defs.h> |
4b32da2b | 44 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
45 | #include <linux/ppp_channel.h> |
46 | #include <linux/atmppp.h> | |
47 | ||
48 | #include "common.h" | |
49 | ||
1da177e4 LT |
50 | enum pppoatm_encaps { |
51 | e_autodetect = PPPOATM_ENCAPS_AUTODETECT, | |
52 | e_vc = PPPOATM_ENCAPS_VC, | |
53 | e_llc = PPPOATM_ENCAPS_LLC, | |
54 | }; | |
55 | ||
56 | struct pppoatm_vcc { | |
57 | struct atm_vcc *atmvcc; /* VCC descriptor */ | |
58 | void (*old_push)(struct atm_vcc *, struct sk_buff *); | |
59 | void (*old_pop)(struct atm_vcc *, struct sk_buff *); | |
0e56d99a | 60 | void (*old_release_cb)(struct atm_vcc *); |
e41faed9 | 61 | struct module *old_owner; |
1da177e4 LT |
62 | /* keep old push/pop for detaching */ |
63 | enum pppoatm_encaps encaps; | |
9d02daf7 DW |
64 | atomic_t inflight; |
65 | unsigned long blocked; | |
1da177e4 LT |
66 | int flags; /* SC_COMP_PROT - compress protocol */ |
67 | struct ppp_channel chan; /* interface to generic ppp layer */ | |
68 | struct tasklet_struct wakeup_tasklet; | |
69 | }; | |
70 | ||
9d02daf7 DW |
71 | /* |
72 | * We want to allow two packets in the queue. The one that's currently in | |
73 | * flight, and *one* queued up ready for the ATM device to send immediately | |
74 | * from its TX done IRQ. We want to be able to use atomic_inc_not_zero(), so | |
75 | * inflight == -2 represents an empty queue, -1 one packet, and zero means | |
76 | * there are two packets in the queue. | |
77 | */ | |
78 | #define NONE_INFLIGHT -2 | |
79 | ||
80 | #define BLOCKED 0 | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * Header used for LLC Encapsulated PPP (4 bytes) followed by the LCP protocol | |
84 | * ID (0xC021) used in autodetection | |
85 | */ | |
86 | static const unsigned char pppllc[6] = { 0xFE, 0xFE, 0x03, 0xCF, 0xC0, 0x21 }; | |
87 | #define LLC_LEN (4) | |
88 | ||
89 | static inline struct pppoatm_vcc *atmvcc_to_pvcc(const struct atm_vcc *atmvcc) | |
90 | { | |
91 | return (struct pppoatm_vcc *) (atmvcc->user_back); | |
92 | } | |
93 | ||
94 | static inline struct pppoatm_vcc *chan_to_pvcc(const struct ppp_channel *chan) | |
95 | { | |
96 | return (struct pppoatm_vcc *) (chan->private); | |
97 | } | |
98 | ||
99 | /* | |
100 | * We can't do this directly from our _pop handler, since the ppp code | |
101 | * doesn't want to be called in interrupt context, so we do it from | |
102 | * a tasklet | |
103 | */ | |
104 | static void pppoatm_wakeup_sender(unsigned long arg) | |
105 | { | |
106 | ppp_output_wakeup((struct ppp_channel *) arg); | |
107 | } | |
108 | ||
0e56d99a DW |
109 | static void pppoatm_release_cb(struct atm_vcc *atmvcc) |
110 | { | |
111 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
112 | ||
5b4d7208 DW |
113 | /* |
114 | * As in pppoatm_pop(), it's safe to clear the BLOCKED bit here because | |
115 | * the wakeup *can't* race with pppoatm_send(). They both hold the PPP | |
116 | * channel's ->downl lock. And the potential race with *setting* it, | |
117 | * which leads to the double-check dance in pppoatm_may_send(), doesn't | |
118 | * exist here. In the sock_owned_by_user() case in pppoatm_send(), we | |
119 | * set the BLOCKED bit while the socket is still locked. We know that | |
120 | * ->release_cb() can't be called until that's done. | |
121 | */ | |
122 | if (test_and_clear_bit(BLOCKED, &pvcc->blocked)) | |
123 | tasklet_schedule(&pvcc->wakeup_tasklet); | |
0e56d99a DW |
124 | if (pvcc->old_release_cb) |
125 | pvcc->old_release_cb(atmvcc); | |
126 | } | |
1da177e4 LT |
127 | /* |
128 | * This gets called every time the ATM card has finished sending our | |
129 | * skb. The ->old_pop will take care up normal atm flow control, | |
130 | * but we also need to wake up the device if we blocked it | |
131 | */ | |
132 | static void pppoatm_pop(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
133 | { | |
134 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
9d02daf7 | 135 | |
1da177e4 | 136 | pvcc->old_pop(atmvcc, skb); |
9d02daf7 DW |
137 | atomic_dec(&pvcc->inflight); |
138 | ||
1da177e4 | 139 | /* |
9d02daf7 DW |
140 | * We always used to run the wakeup tasklet unconditionally here, for |
141 | * fear of race conditions where we clear the BLOCKED flag just as we | |
142 | * refuse another packet in pppoatm_send(). This was quite inefficient. | |
143 | * | |
144 | * In fact it's OK. The PPP core will only ever call pppoatm_send() | |
145 | * while holding the channel->downl lock. And ppp_output_wakeup() as | |
146 | * called by the tasklet will *also* grab that lock. So even if another | |
147 | * CPU is in pppoatm_send() right now, the tasklet isn't going to race | |
148 | * with it. The wakeup *will* happen after the other CPU is safely out | |
149 | * of pppoatm_send() again. | |
150 | * | |
151 | * So if the CPU in pppoatm_send() has already set the BLOCKED bit and | |
152 | * it about to return, that's fine. We trigger a wakeup which will | |
153 | * happen later. And if the CPU in pppoatm_send() *hasn't* set the | |
154 | * BLOCKED bit yet, that's fine too because of the double check in | |
155 | * pppoatm_may_send() which is commented there. | |
1da177e4 | 156 | */ |
9d02daf7 DW |
157 | if (test_and_clear_bit(BLOCKED, &pvcc->blocked)) |
158 | tasklet_schedule(&pvcc->wakeup_tasklet); | |
1da177e4 LT |
159 | } |
160 | ||
161 | /* | |
162 | * Unbind from PPP - currently we only do this when closing the socket, | |
163 | * but we could put this into an ioctl if need be | |
164 | */ | |
165 | static void pppoatm_unassign_vcc(struct atm_vcc *atmvcc) | |
166 | { | |
167 | struct pppoatm_vcc *pvcc; | |
168 | pvcc = atmvcc_to_pvcc(atmvcc); | |
169 | atmvcc->push = pvcc->old_push; | |
170 | atmvcc->pop = pvcc->old_pop; | |
0e56d99a | 171 | atmvcc->release_cb = pvcc->old_release_cb; |
1da177e4 LT |
172 | tasklet_kill(&pvcc->wakeup_tasklet); |
173 | ppp_unregister_channel(&pvcc->chan); | |
174 | atmvcc->user_back = NULL; | |
175 | kfree(pvcc); | |
1da177e4 LT |
176 | } |
177 | ||
178 | /* Called when an AAL5 PDU comes in */ | |
179 | static void pppoatm_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
180 | { | |
181 | struct pppoatm_vcc *pvcc = atmvcc_to_pvcc(atmvcc); | |
99824461 | 182 | pr_debug("\n"); |
1da177e4 | 183 | if (skb == NULL) { /* VCC was closed */ |
e41faed9 KM |
184 | struct module *module; |
185 | ||
52240062 | 186 | pr_debug("removing ATMPPP VCC %p\n", pvcc); |
e41faed9 | 187 | module = pvcc->old_owner; |
1da177e4 LT |
188 | pppoatm_unassign_vcc(atmvcc); |
189 | atmvcc->push(atmvcc, NULL); /* Pass along bad news */ | |
e41faed9 | 190 | module_put(module); |
1da177e4 LT |
191 | return; |
192 | } | |
193 | atm_return(atmvcc, skb->truesize); | |
194 | switch (pvcc->encaps) { | |
195 | case e_llc: | |
196 | if (skb->len < LLC_LEN || | |
197 | memcmp(skb->data, pppllc, LLC_LEN)) | |
198 | goto error; | |
199 | skb_pull(skb, LLC_LEN); | |
200 | break; | |
201 | case e_autodetect: | |
202 | if (pvcc->chan.ppp == NULL) { /* Not bound yet! */ | |
203 | kfree_skb(skb); | |
204 | return; | |
205 | } | |
206 | if (skb->len >= sizeof(pppllc) && | |
207 | !memcmp(skb->data, pppllc, sizeof(pppllc))) { | |
208 | pvcc->encaps = e_llc; | |
209 | skb_pull(skb, LLC_LEN); | |
210 | break; | |
211 | } | |
212 | if (skb->len >= (sizeof(pppllc) - LLC_LEN) && | |
213 | !memcmp(skb->data, &pppllc[LLC_LEN], | |
214 | sizeof(pppllc) - LLC_LEN)) { | |
215 | pvcc->encaps = e_vc; | |
216 | pvcc->chan.mtu += LLC_LEN; | |
217 | break; | |
218 | } | |
a8a213cb | 219 | pr_debug("Couldn't autodetect yet (skb: %6ph)\n", skb->data); |
1da177e4 LT |
220 | goto error; |
221 | case e_vc: | |
222 | break; | |
223 | } | |
224 | ppp_input(&pvcc->chan, skb); | |
225 | return; | |
d81219db JP |
226 | |
227 | error: | |
1da177e4 LT |
228 | kfree_skb(skb); |
229 | ppp_input_error(&pvcc->chan, 0); | |
230 | } | |
231 | ||
397ff16d | 232 | static int pppoatm_may_send(struct pppoatm_vcc *pvcc, int size) |
9d02daf7 DW |
233 | { |
234 | /* | |
235 | * It's not clear that we need to bother with using atm_may_send() | |
236 | * to check we don't exceed sk->sk_sndbuf. If userspace sets a | |
237 | * value of sk_sndbuf which is lower than the MTU, we're going to | |
238 | * block for ever. But the code always did that before we introduced | |
239 | * the packet count limit, so... | |
240 | */ | |
241 | if (atm_may_send(pvcc->atmvcc, size) && | |
f74445b6 | 242 | atomic_inc_not_zero(&pvcc->inflight)) |
9d02daf7 DW |
243 | return 1; |
244 | ||
245 | /* | |
246 | * We use test_and_set_bit() rather than set_bit() here because | |
247 | * we need to ensure there's a memory barrier after it. The bit | |
248 | * *must* be set before we do the atomic_inc() on pvcc->inflight. | |
249 | * There's no smp_mb__after_set_bit(), so it's this or abuse | |
4e857c58 | 250 | * smp_mb__after_atomic(). |
9d02daf7 DW |
251 | */ |
252 | test_and_set_bit(BLOCKED, &pvcc->blocked); | |
253 | ||
254 | /* | |
255 | * We may have raced with pppoatm_pop(). If it ran for the | |
256 | * last packet in the queue, *just* before we set the BLOCKED | |
257 | * bit, then it might never run again and the channel could | |
258 | * remain permanently blocked. Cope with that race by checking | |
259 | * *again*. If it did run in that window, we'll have space on | |
260 | * the queue now and can return success. It's harmless to leave | |
261 | * the BLOCKED flag set, since it's only used as a trigger to | |
262 | * run the wakeup tasklet. Another wakeup will never hurt. | |
263 | * If pppoatm_pop() is running but hasn't got as far as making | |
264 | * space on the queue yet, then it hasn't checked the BLOCKED | |
265 | * flag yet either, so we're safe in that case too. It'll issue | |
266 | * an "immediate" wakeup... where "immediate" actually involves | |
267 | * taking the PPP channel's ->downl lock, which is held by the | |
268 | * code path that calls pppoatm_send(), and is thus going to | |
269 | * wait for us to finish. | |
270 | */ | |
271 | if (atm_may_send(pvcc->atmvcc, size) && | |
272 | atomic_inc_not_zero(&pvcc->inflight)) | |
273 | return 1; | |
274 | ||
275 | return 0; | |
276 | } | |
1da177e4 LT |
277 | /* |
278 | * Called by the ppp_generic.c to send a packet - returns true if packet | |
279 | * was accepted. If we return false, then it's our job to call | |
280 | * ppp_output_wakeup(chan) when we're feeling more up to it. | |
281 | * Note that in the ENOMEM case (as opposed to the !atm_may_send case) | |
282 | * we should really drop the packet, but the generic layer doesn't | |
283 | * support this yet. We just return 'DROP_PACKET' which we actually define | |
284 | * as success, just to be clear what we're really doing. | |
285 | */ | |
286 | #define DROP_PACKET 1 | |
287 | static int pppoatm_send(struct ppp_channel *chan, struct sk_buff *skb) | |
288 | { | |
289 | struct pppoatm_vcc *pvcc = chan_to_pvcc(chan); | |
3ac10800 KM |
290 | struct atm_vcc *vcc; |
291 | int ret; | |
292 | ||
1da177e4 | 293 | ATM_SKB(skb)->vcc = pvcc->atmvcc; |
99824461 | 294 | pr_debug("(skb=0x%p, vcc=0x%p)\n", skb, pvcc->atmvcc); |
1da177e4 LT |
295 | if (skb->data[0] == '\0' && (pvcc->flags & SC_COMP_PROT)) |
296 | (void) skb_pull(skb, 1); | |
3ac10800 KM |
297 | |
298 | vcc = ATM_SKB(skb)->vcc; | |
299 | bh_lock_sock(sk_atm(vcc)); | |
5b4d7208 DW |
300 | if (sock_owned_by_user(sk_atm(vcc))) { |
301 | /* | |
302 | * Needs to happen (and be flushed, hence test_and_) before we unlock | |
303 | * the socket. It needs to be seen by the time our ->release_cb gets | |
304 | * called. | |
305 | */ | |
306 | test_and_set_bit(BLOCKED, &pvcc->blocked); | |
3ac10800 | 307 | goto nospace; |
5b4d7208 | 308 | } |
071d9393 KM |
309 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
310 | test_bit(ATM_VF_CLOSE, &vcc->flags) || | |
311 | !test_bit(ATM_VF_READY, &vcc->flags)) { | |
312 | bh_unlock_sock(sk_atm(vcc)); | |
313 | kfree_skb(skb); | |
314 | return DROP_PACKET; | |
315 | } | |
3ac10800 | 316 | |
1da177e4 LT |
317 | switch (pvcc->encaps) { /* LLC encapsulation needed */ |
318 | case e_llc: | |
319 | if (skb_headroom(skb) < LLC_LEN) { | |
320 | struct sk_buff *n; | |
321 | n = skb_realloc_headroom(skb, LLC_LEN); | |
322 | if (n != NULL && | |
9d02daf7 | 323 | !pppoatm_may_send(pvcc, n->truesize)) { |
1da177e4 LT |
324 | kfree_skb(n); |
325 | goto nospace; | |
326 | } | |
5d0ba55b | 327 | consume_skb(skb); |
d81219db | 328 | skb = n; |
3ac10800 KM |
329 | if (skb == NULL) { |
330 | bh_unlock_sock(sk_atm(vcc)); | |
1da177e4 | 331 | return DROP_PACKET; |
3ac10800 | 332 | } |
9d02daf7 | 333 | } else if (!pppoatm_may_send(pvcc, skb->truesize)) |
1da177e4 LT |
334 | goto nospace; |
335 | memcpy(skb_push(skb, LLC_LEN), pppllc, LLC_LEN); | |
336 | break; | |
337 | case e_vc: | |
9d02daf7 | 338 | if (!pppoatm_may_send(pvcc, skb->truesize)) |
1da177e4 LT |
339 | goto nospace; |
340 | break; | |
341 | case e_autodetect: | |
3ac10800 | 342 | bh_unlock_sock(sk_atm(vcc)); |
52240062 | 343 | pr_debug("Trying to send without setting encaps!\n"); |
1da177e4 LT |
344 | kfree_skb(skb); |
345 | return 1; | |
346 | } | |
347 | ||
9bbe60a6 | 348 | atm_account_tx(vcc, skb); |
99824461 JP |
349 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", |
350 | skb, ATM_SKB(skb)->vcc, ATM_SKB(skb)->vcc->dev); | |
3ac10800 | 351 | ret = ATM_SKB(skb)->vcc->send(ATM_SKB(skb)->vcc, skb) |
1da177e4 | 352 | ? DROP_PACKET : 1; |
3ac10800 KM |
353 | bh_unlock_sock(sk_atm(vcc)); |
354 | return ret; | |
d81219db | 355 | nospace: |
3ac10800 | 356 | bh_unlock_sock(sk_atm(vcc)); |
1da177e4 LT |
357 | /* |
358 | * We don't have space to send this SKB now, but we might have | |
359 | * already applied SC_COMP_PROT compression, so may need to undo | |
360 | */ | |
361 | if ((pvcc->flags & SC_COMP_PROT) && skb_headroom(skb) > 0 && | |
362 | skb->data[-1] == '\0') | |
363 | (void) skb_push(skb, 1); | |
364 | return 0; | |
365 | } | |
366 | ||
367 | /* This handles ioctls sent to the /dev/ppp interface */ | |
368 | static int pppoatm_devppp_ioctl(struct ppp_channel *chan, unsigned int cmd, | |
369 | unsigned long arg) | |
370 | { | |
371 | switch (cmd) { | |
372 | case PPPIOCGFLAGS: | |
373 | return put_user(chan_to_pvcc(chan)->flags, (int __user *) arg) | |
374 | ? -EFAULT : 0; | |
375 | case PPPIOCSFLAGS: | |
376 | return get_user(chan_to_pvcc(chan)->flags, (int __user *) arg) | |
377 | ? -EFAULT : 0; | |
378 | } | |
379 | return -ENOTTY; | |
380 | } | |
381 | ||
d7100da0 | 382 | static const struct ppp_channel_ops pppoatm_ops = { |
1da177e4 LT |
383 | .start_xmit = pppoatm_send, |
384 | .ioctl = pppoatm_devppp_ioctl, | |
385 | }; | |
386 | ||
387 | static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg) | |
388 | { | |
389 | struct atm_backend_ppp be; | |
390 | struct pppoatm_vcc *pvcc; | |
391 | int err; | |
392 | /* | |
393 | * Each PPPoATM instance has its own tasklet - this is just a | |
394 | * prototypical one used to initialize them | |
395 | */ | |
396 | static const DECLARE_TASKLET(tasklet_proto, pppoatm_wakeup_sender, 0); | |
397 | if (copy_from_user(&be, arg, sizeof be)) | |
398 | return -EFAULT; | |
399 | if (be.encaps != PPPOATM_ENCAPS_AUTODETECT && | |
400 | be.encaps != PPPOATM_ENCAPS_VC && be.encaps != PPPOATM_ENCAPS_LLC) | |
401 | return -EINVAL; | |
0da974f4 | 402 | pvcc = kzalloc(sizeof(*pvcc), GFP_KERNEL); |
1da177e4 LT |
403 | if (pvcc == NULL) |
404 | return -ENOMEM; | |
1da177e4 | 405 | pvcc->atmvcc = atmvcc; |
9d02daf7 DW |
406 | |
407 | /* Maximum is zero, so that we can use atomic_inc_not_zero() */ | |
408 | atomic_set(&pvcc->inflight, NONE_INFLIGHT); | |
1da177e4 LT |
409 | pvcc->old_push = atmvcc->push; |
410 | pvcc->old_pop = atmvcc->pop; | |
e41faed9 | 411 | pvcc->old_owner = atmvcc->owner; |
0e56d99a | 412 | pvcc->old_release_cb = atmvcc->release_cb; |
1da177e4 LT |
413 | pvcc->encaps = (enum pppoatm_encaps) be.encaps; |
414 | pvcc->chan.private = pvcc; | |
415 | pvcc->chan.ops = &pppoatm_ops; | |
416 | pvcc->chan.mtu = atmvcc->qos.txtp.max_sdu - PPP_HDRLEN - | |
417 | (be.encaps == e_vc ? 0 : LLC_LEN); | |
418 | pvcc->wakeup_tasklet = tasklet_proto; | |
419 | pvcc->wakeup_tasklet.data = (unsigned long) &pvcc->chan; | |
d81219db JP |
420 | err = ppp_register_channel(&pvcc->chan); |
421 | if (err != 0) { | |
1da177e4 LT |
422 | kfree(pvcc); |
423 | return err; | |
424 | } | |
425 | atmvcc->user_back = pvcc; | |
426 | atmvcc->push = pppoatm_push; | |
427 | atmvcc->pop = pppoatm_pop; | |
0e56d99a | 428 | atmvcc->release_cb = pppoatm_release_cb; |
1da177e4 | 429 | __module_get(THIS_MODULE); |
e41faed9 | 430 | atmvcc->owner = THIS_MODULE; |
4e55f578 JBD |
431 | |
432 | /* re-process everything received between connection setup and | |
433 | backend setup */ | |
434 | vcc_process_recv_queue(atmvcc); | |
1da177e4 LT |
435 | return 0; |
436 | } | |
437 | ||
438 | /* | |
439 | * This handles ioctls actually performed on our vcc - we must return | |
440 | * -ENOIOCTLCMD for any unrecognized ioctl | |
441 | */ | |
442 | static int pppoatm_ioctl(struct socket *sock, unsigned int cmd, | |
443 | unsigned long arg) | |
444 | { | |
445 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
446 | void __user *argp = (void __user *)arg; | |
447 | ||
448 | if (cmd != ATM_SETBACKEND && atmvcc->push != pppoatm_push) | |
449 | return -ENOIOCTLCMD; | |
450 | switch (cmd) { | |
451 | case ATM_SETBACKEND: { | |
452 | atm_backend_t b; | |
453 | if (get_user(b, (atm_backend_t __user *) argp)) | |
454 | return -EFAULT; | |
455 | if (b != ATM_BACKEND_PPP) | |
456 | return -ENOIOCTLCMD; | |
457 | if (!capable(CAP_NET_ADMIN)) | |
458 | return -EPERM; | |
3b1a9145 KM |
459 | if (sock->state != SS_CONNECTED) |
460 | return -EINVAL; | |
1da177e4 LT |
461 | return pppoatm_assign_vcc(atmvcc, argp); |
462 | } | |
463 | case PPPIOCGCHAN: | |
464 | return put_user(ppp_channel_index(&atmvcc_to_pvcc(atmvcc)-> | |
465 | chan), (int __user *) argp) ? -EFAULT : 0; | |
466 | case PPPIOCGUNIT: | |
467 | return put_user(ppp_unit_number(&atmvcc_to_pvcc(atmvcc)-> | |
468 | chan), (int __user *) argp) ? -EFAULT : 0; | |
469 | } | |
470 | return -ENOIOCTLCMD; | |
471 | } | |
472 | ||
473 | static struct atm_ioctl pppoatm_ioctl_ops = { | |
474 | .owner = THIS_MODULE, | |
475 | .ioctl = pppoatm_ioctl, | |
476 | }; | |
477 | ||
478 | static int __init pppoatm_init(void) | |
479 | { | |
480 | register_atm_ioctl(&pppoatm_ioctl_ops); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static void __exit pppoatm_exit(void) | |
485 | { | |
486 | deregister_atm_ioctl(&pppoatm_ioctl_ops); | |
487 | } | |
488 | ||
489 | module_init(pppoatm_init); | |
490 | module_exit(pppoatm_exit); | |
491 | ||
492 | MODULE_AUTHOR("Mitchell Blank Jr <mitch@sfgoth.com>"); | |
493 | MODULE_DESCRIPTION("RFC2364 PPP over ATM/AAL5"); | |
494 | MODULE_LICENSE("GPL"); |