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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 <[email protected]> */
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
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