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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 ATM_SETSC:
 85                 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",
 86                                      current->comm, task_pid_nr(current));
 87                 error = 0;
 88                 goto done;
 89         case ATMSIGD_CTRL:
 90                 if (!capable(CAP_NET_ADMIN)) {
 91                         error = -EPERM;
 92                         goto done;
 93                 }
 94                 /*
 95                  * The user/kernel protocol for exchanging signalling
 96                  * info uses kernel pointers as opaque references,
 97                  * so the holder of the file descriptor can scribble
 98                  * on the kernel... so we should make sure that we
 99                  * have the same privileges that /proc/kcore needs
100                  */
101                 if (!capable(CAP_SYS_RAWIO)) {
102                         error = -EPERM;
103                         goto done;
104                 }
105 #ifdef CONFIG_COMPAT
106                 /* WTF? I don't even want to _think_ about making this
107                    work for 32-bit userspace. TBH I don't really want
108                    to think about it at all. dwmw2. */
109                 if (compat) {
110                         net_warn_ratelimited("32-bit task cannot be atmsigd\n");
111                         error = -EINVAL;
112                         goto done;
113                 }
114 #endif
115                 error = sigd_attach(vcc);
116                 if (!error)
117                         sock->state = SS_CONNECTED;
118                 goto done;
119         case ATM_SETBACKEND:
120         case ATM_NEWBACKENDIF:
121         {
122                 atm_backend_t backend;
123                 error = get_user(backend, (atm_backend_t __user *)argp);
124                 if (error)
125                         goto done;
126                 switch (backend) {
127                 case ATM_BACKEND_PPP:
128                         request_module("pppoatm");
129                         break;
130                 case ATM_BACKEND_BR2684:
131                         request_module("br2684");
132                         break;
133                 }
134                 break;
135         }
136         case ATMMPC_CTRL:
137         case ATMMPC_DATA:
138                 request_module("mpoa");
139                 break;
140         case ATMARPD_CTRL:
141                 request_module("clip");
142                 break;
143         case ATMLEC_CTRL:
144                 request_module("lec");
145                 break;
146         }
147 
148         error = -ENOIOCTLCMD;
149 
150         mutex_lock(&ioctl_mutex);
151         list_for_each(pos, &ioctl_list) {
152                 struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
153                 if (try_module_get(ic->owner)) {
154                         error = ic->ioctl(sock, cmd, arg);
155                         module_put(ic->owner);
156                         if (error != -ENOIOCTLCMD)
157                                 break;
158                 }
159         }
160         mutex_unlock(&ioctl_mutex);
161 
162         if (error != -ENOIOCTLCMD)
163                 goto done;
164 
165         error = atm_dev_ioctl(cmd, argp, compat);
166 
167 done:
168         return error;
169 }
170 
171 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
172 {
173         return do_vcc_ioctl(sock, cmd, arg, 0);
174 }
175 
176 #ifdef CONFIG_COMPAT
177 /*
178  * FIXME:
179  * The compat_ioctl handling is duplicated, using both these conversion
180  * routines and the compat argument to the actual handlers. Both
181  * versions are somewhat incomplete and should be merged, e.g. by
182  * moving the ioctl number translation into the actual handlers and
183  * killing the conversion code.
184  *
185  * -arnd, November 2009
186  */
187 #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
188 #define ATM_GETNAMES32    _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
189 #define ATM_GETTYPE32     _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
190 #define ATM_GETESI32      _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
191 #define ATM_GETADDR32     _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
192 #define ATM_RSTADDR32     _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
193 #define ATM_ADDADDR32     _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
194 #define ATM_DELADDR32     _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
195 #define ATM_GETCIRANGE32  _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
196 #define ATM_SETCIRANGE32  _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
197 #define ATM_SETESI32      _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
198 #define ATM_SETESIF32     _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
199 #define ATM_GETSTAT32     _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
200 #define ATM_GETSTATZ32    _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
201 #define ATM_GETLOOP32     _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
202 #define ATM_SETLOOP32     _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
203 #define ATM_QUERYLOOP32   _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
204 
205 static struct {
206         unsigned int cmd32;
207         unsigned int cmd;
208 } atm_ioctl_map[] = {
209         { ATM_GETLINKRATE32, ATM_GETLINKRATE },
210         { ATM_GETNAMES32,    ATM_GETNAMES },
211         { ATM_GETTYPE32,     ATM_GETTYPE },
212         { ATM_GETESI32,      ATM_GETESI },
213         { ATM_GETADDR32,     ATM_GETADDR },
214         { ATM_RSTADDR32,     ATM_RSTADDR },
215         { ATM_ADDADDR32,     ATM_ADDADDR },
216         { ATM_DELADDR32,     ATM_DELADDR },
217         { ATM_GETCIRANGE32,  ATM_GETCIRANGE },
218         { ATM_SETCIRANGE32,  ATM_SETCIRANGE },
219         { ATM_SETESI32,      ATM_SETESI },
220         { ATM_SETESIF32,     ATM_SETESIF },
221         { ATM_GETSTAT32,     ATM_GETSTAT },
222         { ATM_GETSTATZ32,    ATM_GETSTATZ },
223         { ATM_GETLOOP32,     ATM_GETLOOP },
224         { ATM_SETLOOP32,     ATM_SETLOOP },
225         { ATM_QUERYLOOP32,   ATM_QUERYLOOP },
226 };
227 
228 #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
229 
230 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
231                         unsigned long arg)
232 {
233         struct atm_iobuf __user *iobuf;
234         struct compat_atm_iobuf __user *iobuf32;
235         u32 data;
236         void __user *datap;
237         int len, err;
238 
239         iobuf = compat_alloc_user_space(sizeof(*iobuf));
240         iobuf32 = compat_ptr(arg);
241 
242         if (get_user(len, &iobuf32->length) ||
243             get_user(data, &iobuf32->buffer))
244                 return -EFAULT;
245         datap = compat_ptr(data);
246         if (put_user(len, &iobuf->length) ||
247             put_user(datap, &iobuf->buffer))
248                 return -EFAULT;
249 
250         err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
251 
252         if (!err) {
253                 if (copy_in_user(&iobuf32->length, &iobuf->length,
254                                  sizeof(int)))
255                         err = -EFAULT;
256         }
257 
258         return err;
259 }
260 
261 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
262                          unsigned long arg)
263 {
264         struct atmif_sioc __user *sioc;
265         struct compat_atmif_sioc __user *sioc32;
266         u32 data;
267         void __user *datap;
268         int err;
269 
270         sioc = compat_alloc_user_space(sizeof(*sioc));
271         sioc32 = compat_ptr(arg);
272 
273         if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
274             get_user(data, &sioc32->arg))
275                 return -EFAULT;
276         datap = compat_ptr(data);
277         if (put_user(datap, &sioc->arg))
278                 return -EFAULT;
279 
280         err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
281 
282         if (!err) {
283                 if (copy_in_user(&sioc32->length, &sioc->length,
284                                  sizeof(int)))
285                         err = -EFAULT;
286         }
287         return err;
288 }
289 
290 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
291                         unsigned long arg)
292 {
293         int i;
294         unsigned int cmd = 0;
295 
296         switch (cmd32) {
297         case SONET_GETSTAT:
298         case SONET_GETSTATZ:
299         case SONET_GETDIAG:
300         case SONET_SETDIAG:
301         case SONET_CLRDIAG:
302         case SONET_SETFRAMING:
303         case SONET_GETFRAMING:
304         case SONET_GETFRSENSE:
305                 return do_atmif_sioc(sock, cmd32, arg);
306         }
307 
308         for (i = 0; i < NR_ATM_IOCTL; i++) {
309                 if (cmd32 == atm_ioctl_map[i].cmd32) {
310                         cmd = atm_ioctl_map[i].cmd;
311                         break;
312                 }
313         }
314         if (i == NR_ATM_IOCTL)
315                 return -EINVAL;
316 
317         switch (cmd) {
318         case ATM_GETNAMES:
319                 return do_atm_iobuf(sock, cmd, arg);
320 
321         case ATM_GETLINKRATE:
322         case ATM_GETTYPE:
323         case ATM_GETESI:
324         case ATM_GETADDR:
325         case ATM_RSTADDR:
326         case ATM_ADDADDR:
327         case ATM_DELADDR:
328         case ATM_GETCIRANGE:
329         case ATM_SETCIRANGE:
330         case ATM_SETESI:
331         case ATM_SETESIF:
332         case ATM_GETSTAT:
333         case ATM_GETSTATZ:
334         case ATM_GETLOOP:
335         case ATM_SETLOOP:
336         case ATM_QUERYLOOP:
337                 return do_atmif_sioc(sock, cmd, arg);
338         }
339 
340         return -EINVAL;
341 }
342 
343 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
344                      unsigned long arg)
345 {
346         int ret;
347 
348         ret = do_vcc_ioctl(sock, cmd, arg, 1);
349         if (ret != -ENOIOCTLCMD)
350                 return ret;
351 
352         return do_atm_ioctl(sock, cmd, arg);
353 }
354 #endif
355 

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