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TOMOYO Linux Cross Reference
Linux/net/atm/ioctl.c

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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                 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",
101                                      current->comm, task_pid_nr(current));
102                 error = 0;
103                 goto done;
104         case ATMSIGD_CTRL:
105                 if (!capable(CAP_NET_ADMIN)) {
106                         error = -EPERM;
107                         goto done;
108                 }
109                 /*
110                  * The user/kernel protocol for exchanging signalling
111                  * info uses kernel pointers as opaque references,
112                  * so the holder of the file descriptor can scribble
113                  * on the kernel... so we should make sure that we
114                  * have the same privileges that /proc/kcore needs
115                  */
116                 if (!capable(CAP_SYS_RAWIO)) {
117                         error = -EPERM;
118                         goto done;
119                 }
120 #ifdef CONFIG_COMPAT
121                 /* WTF? I don't even want to _think_ about making this
122                    work for 32-bit userspace. TBH I don't really want
123                    to think about it at all. dwmw2. */
124                 if (compat) {
125                         net_warn_ratelimited("32-bit task cannot be atmsigd\n");
126                         error = -EINVAL;
127                         goto done;
128                 }
129 #endif
130                 error = sigd_attach(vcc);
131                 if (!error)
132                         sock->state = SS_CONNECTED;
133                 goto done;
134         case ATM_SETBACKEND:
135         case ATM_NEWBACKENDIF:
136         {
137                 atm_backend_t backend;
138                 error = get_user(backend, (atm_backend_t __user *)argp);
139                 if (error)
140                         goto done;
141                 switch (backend) {
142                 case ATM_BACKEND_PPP:
143                         request_module("pppoatm");
144                         break;
145                 case ATM_BACKEND_BR2684:
146                         request_module("br2684");
147                         break;
148                 }
149                 break;
150         }
151         case ATMMPC_CTRL:
152         case ATMMPC_DATA:
153                 request_module("mpoa");
154                 break;
155         case ATMARPD_CTRL:
156                 request_module("clip");
157                 break;
158         case ATMLEC_CTRL:
159                 request_module("lec");
160                 break;
161         }
162 
163         error = -ENOIOCTLCMD;
164 
165         mutex_lock(&ioctl_mutex);
166         list_for_each(pos, &ioctl_list) {
167                 struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
168                 if (try_module_get(ic->owner)) {
169                         error = ic->ioctl(sock, cmd, arg);
170                         module_put(ic->owner);
171                         if (error != -ENOIOCTLCMD)
172                                 break;
173                 }
174         }
175         mutex_unlock(&ioctl_mutex);
176 
177         if (error != -ENOIOCTLCMD)
178                 goto done;
179 
180         error = atm_dev_ioctl(cmd, argp, compat);
181 
182 done:
183         return error;
184 }
185 
186 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
187 {
188         return do_vcc_ioctl(sock, cmd, arg, 0);
189 }
190 
191 #ifdef CONFIG_COMPAT
192 /*
193  * FIXME:
194  * The compat_ioctl handling is duplicated, using both these conversion
195  * routines and the compat argument to the actual handlers. Both
196  * versions are somewhat incomplete and should be merged, e.g. by
197  * moving the ioctl number translation into the actual handlers and
198  * killing the conversion code.
199  *
200  * -arnd, November 2009
201  */
202 #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
203 #define ATM_GETNAMES32    _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
204 #define ATM_GETTYPE32     _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
205 #define ATM_GETESI32      _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
206 #define ATM_GETADDR32     _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
207 #define ATM_RSTADDR32     _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
208 #define ATM_ADDADDR32     _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
209 #define ATM_DELADDR32     _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
210 #define ATM_GETCIRANGE32  _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
211 #define ATM_SETCIRANGE32  _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
212 #define ATM_SETESI32      _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
213 #define ATM_SETESIF32     _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
214 #define ATM_GETSTAT32     _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
215 #define ATM_GETSTATZ32    _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
216 #define ATM_GETLOOP32     _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
217 #define ATM_SETLOOP32     _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
218 #define ATM_QUERYLOOP32   _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
219 
220 static struct {
221         unsigned int cmd32;
222         unsigned int cmd;
223 } atm_ioctl_map[] = {
224         { ATM_GETLINKRATE32, ATM_GETLINKRATE },
225         { ATM_GETNAMES32,    ATM_GETNAMES },
226         { ATM_GETTYPE32,     ATM_GETTYPE },
227         { ATM_GETESI32,      ATM_GETESI },
228         { ATM_GETADDR32,     ATM_GETADDR },
229         { ATM_RSTADDR32,     ATM_RSTADDR },
230         { ATM_ADDADDR32,     ATM_ADDADDR },
231         { ATM_DELADDR32,     ATM_DELADDR },
232         { ATM_GETCIRANGE32,  ATM_GETCIRANGE },
233         { ATM_SETCIRANGE32,  ATM_SETCIRANGE },
234         { ATM_SETESI32,      ATM_SETESI },
235         { ATM_SETESIF32,     ATM_SETESIF },
236         { ATM_GETSTAT32,     ATM_GETSTAT },
237         { ATM_GETSTATZ32,    ATM_GETSTATZ },
238         { ATM_GETLOOP32,     ATM_GETLOOP },
239         { ATM_SETLOOP32,     ATM_SETLOOP },
240         { ATM_QUERYLOOP32,   ATM_QUERYLOOP },
241 };
242 
243 #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
244 
245 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
246                         unsigned long arg)
247 {
248         struct atm_iobuf __user *iobuf;
249         struct compat_atm_iobuf __user *iobuf32;
250         u32 data;
251         void __user *datap;
252         int len, err;
253 
254         iobuf = compat_alloc_user_space(sizeof(*iobuf));
255         iobuf32 = compat_ptr(arg);
256 
257         if (get_user(len, &iobuf32->length) ||
258             get_user(data, &iobuf32->buffer))
259                 return -EFAULT;
260         datap = compat_ptr(data);
261         if (put_user(len, &iobuf->length) ||
262             put_user(datap, &iobuf->buffer))
263                 return -EFAULT;
264 
265         err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
266 
267         if (!err) {
268                 if (copy_in_user(&iobuf32->length, &iobuf->length,
269                                  sizeof(int)))
270                         err = -EFAULT;
271         }
272 
273         return err;
274 }
275 
276 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
277                          unsigned long arg)
278 {
279         struct atmif_sioc __user *sioc;
280         struct compat_atmif_sioc __user *sioc32;
281         u32 data;
282         void __user *datap;
283         int err;
284 
285         sioc = compat_alloc_user_space(sizeof(*sioc));
286         sioc32 = compat_ptr(arg);
287 
288         if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
289             get_user(data, &sioc32->arg))
290                 return -EFAULT;
291         datap = compat_ptr(data);
292         if (put_user(datap, &sioc->arg))
293                 return -EFAULT;
294 
295         err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
296 
297         if (!err) {
298                 if (copy_in_user(&sioc32->length, &sioc->length,
299                                  sizeof(int)))
300                         err = -EFAULT;
301         }
302         return err;
303 }
304 
305 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
306                         unsigned long arg)
307 {
308         int i;
309         unsigned int cmd = 0;
310 
311         switch (cmd32) {
312         case SONET_GETSTAT:
313         case SONET_GETSTATZ:
314         case SONET_GETDIAG:
315         case SONET_SETDIAG:
316         case SONET_CLRDIAG:
317         case SONET_SETFRAMING:
318         case SONET_GETFRAMING:
319         case SONET_GETFRSENSE:
320                 return do_atmif_sioc(sock, cmd32, arg);
321         }
322 
323         for (i = 0; i < NR_ATM_IOCTL; i++) {
324                 if (cmd32 == atm_ioctl_map[i].cmd32) {
325                         cmd = atm_ioctl_map[i].cmd;
326                         break;
327                 }
328         }
329         if (i == NR_ATM_IOCTL)
330                 return -EINVAL;
331 
332         switch (cmd) {
333         case ATM_GETNAMES:
334                 return do_atm_iobuf(sock, cmd, arg);
335 
336         case ATM_GETLINKRATE:
337         case ATM_GETTYPE:
338         case ATM_GETESI:
339         case ATM_GETADDR:
340         case ATM_RSTADDR:
341         case ATM_ADDADDR:
342         case ATM_DELADDR:
343         case ATM_GETCIRANGE:
344         case ATM_SETCIRANGE:
345         case ATM_SETESI:
346         case ATM_SETESIF:
347         case ATM_GETSTAT:
348         case ATM_GETSTATZ:
349         case ATM_GETLOOP:
350         case ATM_SETLOOP:
351         case ATM_QUERYLOOP:
352                 return do_atmif_sioc(sock, cmd, arg);
353         }
354 
355         return -EINVAL;
356 }
357 
358 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
359                      unsigned long arg)
360 {
361         int ret;
362 
363         ret = do_vcc_ioctl(sock, cmd, arg, 1);
364         if (ret != -ENOIOCTLCMD)
365                 return ret;
366 
367         return do_atm_ioctl(sock, cmd, arg);
368 }
369 #endif
370 

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