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1 | /* ATM ioctl handling */ |
2 | |
3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
4 | /* 2003 John Levon <levon@movementarian.org> */ |
5 | |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/kmod.h> |
10 | #include <linux/net.h> /* struct socket, struct proto_ops */ |
11 | #include <linux/atm.h> /* ATM stuff */ |
12 | #include <linux/atmdev.h> |
13 | #include <linux/atmclip.h> /* CLIP_*ENCAP */ |
14 | #include <linux/atmarp.h> /* manifest constants */ |
15 | #include <linux/capability.h> |
16 | #include <linux/sonet.h> /* for ioctls */ |
17 | #include <linux/atmsvc.h> |
18 | #include <linux/atmmpc.h> |
19 | #include <net/atmclip.h> |
20 | #include <linux/atmlec.h> |
21 | #include <linux/mutex.h> |
22 | #include <asm/ioctls.h> |
23 | #include <net/compat.h> |
24 | |
25 | #include "resources.h" |
26 | #include "signaling.h" /* for WAITING and sigd_attach */ |
27 | #include "common.h" |
28 | |
29 | |
30 | static DEFINE_MUTEX(ioctl_mutex); |
31 | static LIST_HEAD(ioctl_list); |
32 | |
33 | |
34 | void register_atm_ioctl(struct atm_ioctl *ioctl) |
35 | { |
36 | mutex_lock(&ioctl_mutex); |
37 | list_add_tail(&ioctl->list, &ioctl_list); |
38 | mutex_unlock(&ioctl_mutex); |
39 | } |
40 | EXPORT_SYMBOL(register_atm_ioctl); |
41 | |
42 | void deregister_atm_ioctl(struct atm_ioctl *ioctl) |
43 | { |
44 | mutex_lock(&ioctl_mutex); |
45 | list_del(&ioctl->list); |
46 | mutex_unlock(&ioctl_mutex); |
47 | } |
48 | EXPORT_SYMBOL(deregister_atm_ioctl); |
49 | |
50 | static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, |
51 | unsigned long arg, int compat) |
52 | { |
53 | struct sock *sk = sock->sk; |
54 | struct atm_vcc *vcc; |
55 | int error; |
56 | struct list_head *pos; |
57 | void __user *argp = (void __user *)arg; |
58 | |
59 | vcc = ATM_SD(sock); |
60 | switch (cmd) { |
61 | case SIOCOUTQ: |
62 | if (sock->state != SS_CONNECTED || |
63 | !test_bit(ATM_VF_READY, &vcc->flags)) { |
64 | error = -EINVAL; |
65 | goto done; |
66 | } |
67 | error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk), |
68 | (int __user *)argp) ? -EFAULT : 0; |
69 | goto done; |
70 | case SIOCINQ: |
71 | { |
72 | struct sk_buff *skb; |
73 | |
74 | if (sock->state != SS_CONNECTED) { |
75 | error = -EINVAL; |
76 | goto done; |
77 | } |
78 | skb = skb_peek(&sk->sk_receive_queue); |
79 | error = put_user(skb ? skb->len : 0, |
80 | (int __user *)argp) ? -EFAULT : 0; |
81 | goto done; |
82 | } |
83 | case SIOCGSTAMP: /* borrowed from IP */ |
84 | #ifdef CONFIG_COMPAT |
85 | if (compat) |
86 | error = compat_sock_get_timestamp(sk, argp); |
87 | else |
88 | #endif |
89 | error = sock_get_timestamp(sk, argp); |
90 | goto done; |
91 | case SIOCGSTAMPNS: /* borrowed from IP */ |
92 | #ifdef CONFIG_COMPAT |
93 | if (compat) |
94 | error = compat_sock_get_timestampns(sk, argp); |
95 | else |
96 | #endif |
97 | error = sock_get_timestampns(sk, argp); |
98 | goto done; |
99 | case ATM_SETSC: |
100 | if (net_ratelimit()) |
101 | pr_warning("ATM_SETSC is obsolete; used by %s:%d\n", |
102 | current->comm, task_pid_nr(current)); |
103 | error = 0; |
104 | goto done; |
105 | case ATMSIGD_CTRL: |
106 | if (!capable(CAP_NET_ADMIN)) { |
107 | error = -EPERM; |
108 | goto done; |
109 | } |
110 | /* |
111 | * The user/kernel protocol for exchanging signalling |
112 | * info uses kernel pointers as opaque references, |
113 | * so the holder of the file descriptor can scribble |
114 | * on the kernel... so we should make sure that we |
115 | * have the same privileges that /proc/kcore needs |
116 | */ |
117 | if (!capable(CAP_SYS_RAWIO)) { |
118 | error = -EPERM; |
119 | goto done; |
120 | } |
121 | #ifdef CONFIG_COMPAT |
122 | /* WTF? I don't even want to _think_ about making this |
123 | work for 32-bit userspace. TBH I don't really want |
124 | to think about it at all. dwmw2. */ |
125 | if (compat) { |
126 | if (net_ratelimit()) |
127 | pr_warning("32-bit task cannot be atmsigd\n"); |
128 | error = -EINVAL; |
129 | goto done; |
130 | } |
131 | #endif |
132 | error = sigd_attach(vcc); |
133 | if (!error) |
134 | sock->state = SS_CONNECTED; |
135 | goto done; |
136 | case ATM_SETBACKEND: |
137 | case ATM_NEWBACKENDIF: |
138 | { |
139 | atm_backend_t backend; |
140 | error = get_user(backend, (atm_backend_t __user *)argp); |
141 | if (error) |
142 | goto done; |
143 | switch (backend) { |
144 | case ATM_BACKEND_PPP: |
145 | request_module("pppoatm"); |
146 | break; |
147 | case ATM_BACKEND_BR2684: |
148 | request_module("br2684"); |
149 | break; |
150 | } |
151 | break; |
152 | } |
153 | case ATMMPC_CTRL: |
154 | case ATMMPC_DATA: |
155 | request_module("mpoa"); |
156 | break; |
157 | case ATMARPD_CTRL: |
158 | request_module("clip"); |
159 | break; |
160 | case ATMLEC_CTRL: |
161 | request_module("lec"); |
162 | break; |
163 | } |
164 | |
165 | error = -ENOIOCTLCMD; |
166 | |
167 | mutex_lock(&ioctl_mutex); |
168 | list_for_each(pos, &ioctl_list) { |
169 | struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list); |
170 | if (try_module_get(ic->owner)) { |
171 | error = ic->ioctl(sock, cmd, arg); |
172 | module_put(ic->owner); |
173 | if (error != -ENOIOCTLCMD) |
174 | break; |
175 | } |
176 | } |
177 | mutex_unlock(&ioctl_mutex); |
178 | |
179 | if (error != -ENOIOCTLCMD) |
180 | goto done; |
181 | |
182 | error = atm_dev_ioctl(cmd, argp, compat); |
183 | |
184 | done: |
185 | return error; |
186 | } |
187 | |
188 | int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
189 | { |
190 | return do_vcc_ioctl(sock, cmd, arg, 0); |
191 | } |
192 | |
193 | #ifdef CONFIG_COMPAT |
194 | /* |
195 | * FIXME: |
196 | * The compat_ioctl handling is duplicated, using both these conversion |
197 | * routines and the compat argument to the actual handlers. Both |
198 | * versions are somewhat incomplete and should be merged, e.g. by |
199 | * moving the ioctl number translation into the actual handlers and |
200 | * killing the conversion code. |
201 | * |
202 | * -arnd, November 2009 |
203 | */ |
204 | #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc) |
205 | #define ATM_GETNAMES32 _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf) |
206 | #define ATM_GETTYPE32 _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc) |
207 | #define ATM_GETESI32 _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc) |
208 | #define ATM_GETADDR32 _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc) |
209 | #define ATM_RSTADDR32 _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc) |
210 | #define ATM_ADDADDR32 _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc) |
211 | #define ATM_DELADDR32 _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc) |
212 | #define ATM_GETCIRANGE32 _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc) |
213 | #define ATM_SETCIRANGE32 _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc) |
214 | #define ATM_SETESI32 _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc) |
215 | #define ATM_SETESIF32 _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc) |
216 | #define ATM_GETSTAT32 _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc) |
217 | #define ATM_GETSTATZ32 _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc) |
218 | #define ATM_GETLOOP32 _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc) |
219 | #define ATM_SETLOOP32 _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc) |
220 | #define ATM_QUERYLOOP32 _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc) |
221 | |
222 | static struct { |
223 | unsigned int cmd32; |
224 | unsigned int cmd; |
225 | } atm_ioctl_map[] = { |
226 | { ATM_GETLINKRATE32, ATM_GETLINKRATE }, |
227 | { ATM_GETNAMES32, ATM_GETNAMES }, |
228 | { ATM_GETTYPE32, ATM_GETTYPE }, |
229 | { ATM_GETESI32, ATM_GETESI }, |
230 | { ATM_GETADDR32, ATM_GETADDR }, |
231 | { ATM_RSTADDR32, ATM_RSTADDR }, |
232 | { ATM_ADDADDR32, ATM_ADDADDR }, |
233 | { ATM_DELADDR32, ATM_DELADDR }, |
234 | { ATM_GETCIRANGE32, ATM_GETCIRANGE }, |
235 | { ATM_SETCIRANGE32, ATM_SETCIRANGE }, |
236 | { ATM_SETESI32, ATM_SETESI }, |
237 | { ATM_SETESIF32, ATM_SETESIF }, |
238 | { ATM_GETSTAT32, ATM_GETSTAT }, |
239 | { ATM_GETSTATZ32, ATM_GETSTATZ }, |
240 | { ATM_GETLOOP32, ATM_GETLOOP }, |
241 | { ATM_SETLOOP32, ATM_SETLOOP }, |
242 | { ATM_QUERYLOOP32, ATM_QUERYLOOP }, |
243 | }; |
244 | |
245 | #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map) |
246 | |
247 | static int do_atm_iobuf(struct socket *sock, unsigned int cmd, |
248 | unsigned long arg) |
249 | { |
250 | struct atm_iobuf __user *iobuf; |
251 | struct compat_atm_iobuf __user *iobuf32; |
252 | u32 data; |
253 | void __user *datap; |
254 | int len, err; |
255 | |
256 | iobuf = compat_alloc_user_space(sizeof(*iobuf)); |
257 | iobuf32 = compat_ptr(arg); |
258 | |
259 | if (get_user(len, &iobuf32->length) || |
260 | get_user(data, &iobuf32->buffer)) |
261 | return -EFAULT; |
262 | datap = compat_ptr(data); |
263 | if (put_user(len, &iobuf->length) || |
264 | put_user(datap, &iobuf->buffer)) |
265 | return -EFAULT; |
266 | |
267 | err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0); |
268 | |
269 | if (!err) { |
270 | if (copy_in_user(&iobuf32->length, &iobuf->length, |
271 | sizeof(int))) |
272 | err = -EFAULT; |
273 | } |
274 | |
275 | return err; |
276 | } |
277 | |
278 | static int do_atmif_sioc(struct socket *sock, unsigned int cmd, |
279 | unsigned long arg) |
280 | { |
281 | struct atmif_sioc __user *sioc; |
282 | struct compat_atmif_sioc __user *sioc32; |
283 | u32 data; |
284 | void __user *datap; |
285 | int err; |
286 | |
287 | sioc = compat_alloc_user_space(sizeof(*sioc)); |
288 | sioc32 = compat_ptr(arg); |
289 | |
290 | if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) || |
291 | get_user(data, &sioc32->arg)) |
292 | return -EFAULT; |
293 | datap = compat_ptr(data); |
294 | if (put_user(datap, &sioc->arg)) |
295 | return -EFAULT; |
296 | |
297 | err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0); |
298 | |
299 | if (!err) { |
300 | if (copy_in_user(&sioc32->length, &sioc->length, |
301 | sizeof(int))) |
302 | err = -EFAULT; |
303 | } |
304 | return err; |
305 | } |
306 | |
307 | static int do_atm_ioctl(struct socket *sock, unsigned int cmd32, |
308 | unsigned long arg) |
309 | { |
310 | int i; |
311 | unsigned int cmd = 0; |
312 | |
313 | switch (cmd32) { |
314 | case SONET_GETSTAT: |
315 | case SONET_GETSTATZ: |
316 | case SONET_GETDIAG: |
317 | case SONET_SETDIAG: |
318 | case SONET_CLRDIAG: |
319 | case SONET_SETFRAMING: |
320 | case SONET_GETFRAMING: |
321 | case SONET_GETFRSENSE: |
322 | return do_atmif_sioc(sock, cmd32, arg); |
323 | } |
324 | |
325 | for (i = 0; i < NR_ATM_IOCTL; i++) { |
326 | if (cmd32 == atm_ioctl_map[i].cmd32) { |
327 | cmd = atm_ioctl_map[i].cmd; |
328 | break; |
329 | } |
330 | } |
331 | if (i == NR_ATM_IOCTL) |
332 | return -EINVAL; |
333 | |
334 | switch (cmd) { |
335 | case ATM_GETNAMES: |
336 | return do_atm_iobuf(sock, cmd, arg); |
337 | |
338 | case ATM_GETLINKRATE: |
339 | case ATM_GETTYPE: |
340 | case ATM_GETESI: |
341 | case ATM_GETADDR: |
342 | case ATM_RSTADDR: |
343 | case ATM_ADDADDR: |
344 | case ATM_DELADDR: |
345 | case ATM_GETCIRANGE: |
346 | case ATM_SETCIRANGE: |
347 | case ATM_SETESI: |
348 | case ATM_SETESIF: |
349 | case ATM_GETSTAT: |
350 | case ATM_GETSTATZ: |
351 | case ATM_GETLOOP: |
352 | case ATM_SETLOOP: |
353 | case ATM_QUERYLOOP: |
354 | return do_atmif_sioc(sock, cmd, arg); |
355 | } |
356 | |
357 | return -EINVAL; |
358 | } |
359 | |
360 | int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, |
361 | unsigned long arg) |
362 | { |
363 | int ret; |
364 | |
365 | ret = do_vcc_ioctl(sock, cmd, arg, 1); |
366 | if (ret != -ENOIOCTLCMD) |
367 | return ret; |
368 | |
369 | return do_atm_ioctl(sock, cmd, arg); |
370 | } |
371 | #endif |
372 |
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