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90 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",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