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Linux/net/atm/ioctl.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* ATM ioctl handling */
  3 
  4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  5 /* 2003 John Levon  <levon@movementarian.org> */
  6 
  7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  8 
  9 #include <linux/module.h>
 10 #include <linux/kmod.h>
 11 #include <linux/net.h>          /* struct socket, struct proto_ops */
 12 #include <linux/atm.h>          /* ATM stuff */
 13 #include <linux/atmdev.h>
 14 #include <linux/atmclip.h>      /* CLIP_*ENCAP */
 15 #include <linux/atmarp.h>       /* manifest constants */
 16 #include <linux/capability.h>
 17 #include <linux/sonet.h>        /* for ioctls */
 18 #include <linux/atmsvc.h>
 19 #include <linux/atmmpc.h>
 20 #include <net/atmclip.h>
 21 #include <linux/atmlec.h>
 22 #include <linux/mutex.h>
 23 #include <asm/ioctls.h>
 24 #include <net/compat.h>
 25 
 26 #include "resources.h"
 27 #include "signaling.h"          /* for WAITING and sigd_attach */
 28 #include "common.h"
 29 
 30 
 31 static DEFINE_MUTEX(ioctl_mutex);
 32 static LIST_HEAD(ioctl_list);
 33 
 34 
 35 void register_atm_ioctl(struct atm_ioctl *ioctl)
 36 {
 37         mutex_lock(&ioctl_mutex);
 38         list_add_tail(&ioctl->list, &ioctl_list);
 39         mutex_unlock(&ioctl_mutex);
 40 }
 41 EXPORT_SYMBOL(register_atm_ioctl);
 42 
 43 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
 44 {
 45         mutex_lock(&ioctl_mutex);
 46         list_del(&ioctl->list);
 47         mutex_unlock(&ioctl_mutex);
 48 }
 49 EXPORT_SYMBOL(deregister_atm_ioctl);
 50 
 51 static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
 52                         unsigned long arg, int compat)
 53 {
 54         struct sock *sk = sock->sk;
 55         struct atm_vcc *vcc;
 56         int error;
 57         struct list_head *pos;
 58         void __user *argp = (void __user *)arg;
 59 
 60         vcc = ATM_SD(sock);
 61         switch (cmd) {
 62         case SIOCOUTQ:
 63                 if (sock->state != SS_CONNECTED ||
 64                     !test_bit(ATM_VF_READY, &vcc->flags)) {
 65                         error =  -EINVAL;
 66                         goto done;
 67                 }
 68                 error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
 69                                  (int __user *)argp) ? -EFAULT : 0;
 70                 goto done;
 71         case SIOCINQ:
 72         {
 73                 struct sk_buff *skb;
 74 
 75                 if (sock->state != SS_CONNECTED) {
 76                         error = -EINVAL;
 77                         goto done;
 78                 }
 79                 skb = skb_peek(&sk->sk_receive_queue);
 80                 error = put_user(skb ? skb->len : 0,
 81                                  (int __user *)argp) ? -EFAULT : 0;
 82                 goto done;
 83         }
 84         case SIOCGSTAMP: /* borrowed from IP */
 85 #ifdef CONFIG_COMPAT
 86                 if (compat)
 87                         error = compat_sock_get_timestamp(sk, argp);
 88                 else
 89 #endif
 90                         error = sock_get_timestamp(sk, argp);
 91                 goto done;
 92         case SIOCGSTAMPNS: /* borrowed from IP */
 93 #ifdef CONFIG_COMPAT
 94                 if (compat)
 95                         error = compat_sock_get_timestampns(sk, argp);
 96                 else
 97 #endif
 98                         error = sock_get_timestampns(sk, argp);
 99                 goto done;
100         case ATM_SETSC:
101                 net_warn_ratelimited("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                         net_warn_ratelimited("32-bit task cannot be atmsigd\n");
127                         error = -EINVAL;
128                         goto done;
129                 }
130 #endif
131                 error = sigd_attach(vcc);
132                 if (!error)
133                         sock->state = SS_CONNECTED;
134                 goto done;
135         case ATM_SETBACKEND:
136         case ATM_NEWBACKENDIF:
137         {
138                 atm_backend_t backend;
139                 error = get_user(backend, (atm_backend_t __user *)argp);
140                 if (error)
141                         goto done;
142                 switch (backend) {
143                 case ATM_BACKEND_PPP:
144                         request_module("pppoatm");
145                         break;
146                 case ATM_BACKEND_BR2684:
147                         request_module("br2684");
148                         break;
149                 }
150                 break;
151         }
152         case ATMMPC_CTRL:
153         case ATMMPC_DATA:
154                 request_module("mpoa");
155                 break;
156         case ATMARPD_CTRL:
157                 request_module("clip");
158                 break;
159         case ATMLEC_CTRL:
160                 request_module("lec");
161                 break;
162         }
163 
164         error = -ENOIOCTLCMD;
165 
166         mutex_lock(&ioctl_mutex);
167         list_for_each(pos, &ioctl_list) {
168                 struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
169                 if (try_module_get(ic->owner)) {
170                         error = ic->ioctl(sock, cmd, arg);
171                         module_put(ic->owner);
172                         if (error != -ENOIOCTLCMD)
173                                 break;
174                 }
175         }
176         mutex_unlock(&ioctl_mutex);
177 
178         if (error != -ENOIOCTLCMD)
179                 goto done;
180 
181         error = atm_dev_ioctl(cmd, argp, compat);
182 
183 done:
184         return error;
185 }
186 
187 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
188 {
189         return do_vcc_ioctl(sock, cmd, arg, 0);
190 }
191 
192 #ifdef CONFIG_COMPAT
193 /*
194  * FIXME:
195  * The compat_ioctl handling is duplicated, using both these conversion
196  * routines and the compat argument to the actual handlers. Both
197  * versions are somewhat incomplete and should be merged, e.g. by
198  * moving the ioctl number translation into the actual handlers and
199  * killing the conversion code.
200  *
201  * -arnd, November 2009
202  */
203 #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
204 #define ATM_GETNAMES32    _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
205 #define ATM_GETTYPE32     _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
206 #define ATM_GETESI32      _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
207 #define ATM_GETADDR32     _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
208 #define ATM_RSTADDR32     _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
209 #define ATM_ADDADDR32     _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
210 #define ATM_DELADDR32     _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
211 #define ATM_GETCIRANGE32  _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
212 #define ATM_SETCIRANGE32  _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
213 #define ATM_SETESI32      _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
214 #define ATM_SETESIF32     _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
215 #define ATM_GETSTAT32     _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
216 #define ATM_GETSTATZ32    _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
217 #define ATM_GETLOOP32     _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
218 #define ATM_SETLOOP32     _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
219 #define ATM_QUERYLOOP32   _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
220 
221 static struct {
222         unsigned int cmd32;
223         unsigned int cmd;
224 } atm_ioctl_map[] = {
225         { ATM_GETLINKRATE32, ATM_GETLINKRATE },
226         { ATM_GETNAMES32,    ATM_GETNAMES },
227         { ATM_GETTYPE32,     ATM_GETTYPE },
228         { ATM_GETESI32,      ATM_GETESI },
229         { ATM_GETADDR32,     ATM_GETADDR },
230         { ATM_RSTADDR32,     ATM_RSTADDR },
231         { ATM_ADDADDR32,     ATM_ADDADDR },
232         { ATM_DELADDR32,     ATM_DELADDR },
233         { ATM_GETCIRANGE32,  ATM_GETCIRANGE },
234         { ATM_SETCIRANGE32,  ATM_SETCIRANGE },
235         { ATM_SETESI32,      ATM_SETESI },
236         { ATM_SETESIF32,     ATM_SETESIF },
237         { ATM_GETSTAT32,     ATM_GETSTAT },
238         { ATM_GETSTATZ32,    ATM_GETSTATZ },
239         { ATM_GETLOOP32,     ATM_GETLOOP },
240         { ATM_SETLOOP32,     ATM_SETLOOP },
241         { ATM_QUERYLOOP32,   ATM_QUERYLOOP },
242 };
243 
244 #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
245 
246 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
247                         unsigned long arg)
248 {
249         struct atm_iobuf __user *iobuf;
250         struct compat_atm_iobuf __user *iobuf32;
251         u32 data;
252         void __user *datap;
253         int len, err;
254 
255         iobuf = compat_alloc_user_space(sizeof(*iobuf));
256         iobuf32 = compat_ptr(arg);
257 
258         if (get_user(len, &iobuf32->length) ||
259             get_user(data, &iobuf32->buffer))
260                 return -EFAULT;
261         datap = compat_ptr(data);
262         if (put_user(len, &iobuf->length) ||
263             put_user(datap, &iobuf->buffer))
264                 return -EFAULT;
265 
266         err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
267 
268         if (!err) {
269                 if (copy_in_user(&iobuf32->length, &iobuf->length,
270                                  sizeof(int)))
271                         err = -EFAULT;
272         }
273 
274         return err;
275 }
276 
277 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
278                          unsigned long arg)
279 {
280         struct atmif_sioc __user *sioc;
281         struct compat_atmif_sioc __user *sioc32;
282         u32 data;
283         void __user *datap;
284         int err;
285 
286         sioc = compat_alloc_user_space(sizeof(*sioc));
287         sioc32 = compat_ptr(arg);
288 
289         if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
290             get_user(data, &sioc32->arg))
291                 return -EFAULT;
292         datap = compat_ptr(data);
293         if (put_user(datap, &sioc->arg))
294                 return -EFAULT;
295 
296         err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
297 
298         if (!err) {
299                 if (copy_in_user(&sioc32->length, &sioc->length,
300                                  sizeof(int)))
301                         err = -EFAULT;
302         }
303         return err;
304 }
305 
306 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
307                         unsigned long arg)
308 {
309         int i;
310         unsigned int cmd = 0;
311 
312         switch (cmd32) {
313         case SONET_GETSTAT:
314         case SONET_GETSTATZ:
315         case SONET_GETDIAG:
316         case SONET_SETDIAG:
317         case SONET_CLRDIAG:
318         case SONET_SETFRAMING:
319         case SONET_GETFRAMING:
320         case SONET_GETFRSENSE:
321                 return do_atmif_sioc(sock, cmd32, arg);
322         }
323 
324         for (i = 0; i < NR_ATM_IOCTL; i++) {
325                 if (cmd32 == atm_ioctl_map[i].cmd32) {
326                         cmd = atm_ioctl_map[i].cmd;
327                         break;
328                 }
329         }
330         if (i == NR_ATM_IOCTL)
331                 return -EINVAL;
332 
333         switch (cmd) {
334         case ATM_GETNAMES:
335                 return do_atm_iobuf(sock, cmd, arg);
336 
337         case ATM_GETLINKRATE:
338         case ATM_GETTYPE:
339         case ATM_GETESI:
340         case ATM_GETADDR:
341         case ATM_RSTADDR:
342         case ATM_ADDADDR:
343         case ATM_DELADDR:
344         case ATM_GETCIRANGE:
345         case ATM_SETCIRANGE:
346         case ATM_SETESI:
347         case ATM_SETESIF:
348         case ATM_GETSTAT:
349         case ATM_GETSTATZ:
350         case ATM_GETLOOP:
351         case ATM_SETLOOP:
352         case ATM_QUERYLOOP:
353                 return do_atmif_sioc(sock, cmd, arg);
354         }
355 
356         return -EINVAL;
357 }
358 
359 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
360                      unsigned long arg)
361 {
362         int ret;
363 
364         ret = do_vcc_ioctl(sock, cmd, arg, 1);
365         if (ret != -ENOIOCTLCMD)
366                 return ret;
367 
368         return do_atm_ioctl(sock, cmd, arg);
369 }
370 #endif
371 

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