1 // SPDX-License-Identifier: GPL-2.0
2 /* ATM ioctl handling */
4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5 /* 2003 John Levon <levon@movementarian.org> */
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
26 #include "resources.h"
27 #include "signaling.h" /* for WAITING and sigd_attach */
31 static DEFINE_MUTEX(ioctl_mutex);
32 static LIST_HEAD(ioctl_list);
35 void register_atm_ioctl(struct atm_ioctl *ioctl)
37 mutex_lock(&ioctl_mutex);
38 list_add_tail(&ioctl->list, &ioctl_list);
39 mutex_unlock(&ioctl_mutex);
41 EXPORT_SYMBOL(register_atm_ioctl);
43 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
45 mutex_lock(&ioctl_mutex);
46 list_del(&ioctl->list);
47 mutex_unlock(&ioctl_mutex);
49 EXPORT_SYMBOL(deregister_atm_ioctl);
51 static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
52 unsigned long arg, int compat)
54 struct sock *sk = sock->sk;
57 struct list_head *pos;
58 void __user *argp = (void __user *)arg;
63 if (sock->state != SS_CONNECTED ||
64 !test_bit(ATM_VF_READY, &vcc->flags)) {
68 error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
69 (int __user *)argp) ? -EFAULT : 0;
76 if (sock->state != SS_CONNECTED) {
80 spin_lock_irq(&sk->sk_receive_queue.lock);
81 skb = skb_peek(&sk->sk_receive_queue);
82 amount = skb ? skb->len : 0;
83 spin_unlock_irq(&sk->sk_receive_queue.lock);
84 error = put_user(amount, (int __user *)argp) ? -EFAULT : 0;
87 case SIOCGSTAMP: /* borrowed from IP */
90 error = compat_sock_get_timestamp(sk, argp);
93 error = sock_get_timestamp(sk, argp);
95 case SIOCGSTAMPNS: /* borrowed from IP */
98 error = compat_sock_get_timestampns(sk, argp);
101 error = sock_get_timestampns(sk, argp);
104 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",
105 current->comm, task_pid_nr(current));
109 if (!capable(CAP_NET_ADMIN)) {
114 * The user/kernel protocol for exchanging signalling
115 * info uses kernel pointers as opaque references,
116 * so the holder of the file descriptor can scribble
117 * on the kernel... so we should make sure that we
118 * have the same privileges that /proc/kcore needs
120 if (!capable(CAP_SYS_RAWIO)) {
125 /* WTF? I don't even want to _think_ about making this
126 work for 32-bit userspace. TBH I don't really want
127 to think about it at all. dwmw2. */
129 net_warn_ratelimited("32-bit task cannot be atmsigd\n");
134 error = sigd_attach(vcc);
136 sock->state = SS_CONNECTED;
139 case ATM_NEWBACKENDIF:
141 atm_backend_t backend;
142 error = get_user(backend, (atm_backend_t __user *)argp);
146 case ATM_BACKEND_PPP:
147 request_module("pppoatm");
149 case ATM_BACKEND_BR2684:
150 request_module("br2684");
157 request_module("mpoa");
160 request_module("clip");
163 request_module("lec");
167 error = -ENOIOCTLCMD;
169 mutex_lock(&ioctl_mutex);
170 list_for_each(pos, &ioctl_list) {
171 struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
172 if (try_module_get(ic->owner)) {
173 error = ic->ioctl(sock, cmd, arg);
174 module_put(ic->owner);
175 if (error != -ENOIOCTLCMD)
179 mutex_unlock(&ioctl_mutex);
181 if (error != -ENOIOCTLCMD)
184 error = atm_dev_ioctl(cmd, argp, compat);
190 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
192 return do_vcc_ioctl(sock, cmd, arg, 0);
198 * The compat_ioctl handling is duplicated, using both these conversion
199 * routines and the compat argument to the actual handlers. Both
200 * versions are somewhat incomplete and should be merged, e.g. by
201 * moving the ioctl number translation into the actual handlers and
202 * killing the conversion code.
204 * -arnd, November 2009
206 #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
207 #define ATM_GETNAMES32 _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
208 #define ATM_GETTYPE32 _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
209 #define ATM_GETESI32 _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
210 #define ATM_GETADDR32 _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
211 #define ATM_RSTADDR32 _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
212 #define ATM_ADDADDR32 _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
213 #define ATM_DELADDR32 _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
214 #define ATM_GETCIRANGE32 _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
215 #define ATM_SETCIRANGE32 _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
216 #define ATM_SETESI32 _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
217 #define ATM_SETESIF32 _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
218 #define ATM_GETSTAT32 _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
219 #define ATM_GETSTATZ32 _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
220 #define ATM_GETLOOP32 _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
221 #define ATM_SETLOOP32 _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
222 #define ATM_QUERYLOOP32 _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
227 } atm_ioctl_map[] = {
228 { ATM_GETLINKRATE32, ATM_GETLINKRATE },
229 { ATM_GETNAMES32, ATM_GETNAMES },
230 { ATM_GETTYPE32, ATM_GETTYPE },
231 { ATM_GETESI32, ATM_GETESI },
232 { ATM_GETADDR32, ATM_GETADDR },
233 { ATM_RSTADDR32, ATM_RSTADDR },
234 { ATM_ADDADDR32, ATM_ADDADDR },
235 { ATM_DELADDR32, ATM_DELADDR },
236 { ATM_GETCIRANGE32, ATM_GETCIRANGE },
237 { ATM_SETCIRANGE32, ATM_SETCIRANGE },
238 { ATM_SETESI32, ATM_SETESI },
239 { ATM_SETESIF32, ATM_SETESIF },
240 { ATM_GETSTAT32, ATM_GETSTAT },
241 { ATM_GETSTATZ32, ATM_GETSTATZ },
242 { ATM_GETLOOP32, ATM_GETLOOP },
243 { ATM_SETLOOP32, ATM_SETLOOP },
244 { ATM_QUERYLOOP32, ATM_QUERYLOOP },
247 #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
249 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
252 struct atm_iobuf __user *iobuf;
253 struct compat_atm_iobuf __user *iobuf32;
258 iobuf = compat_alloc_user_space(sizeof(*iobuf));
259 iobuf32 = compat_ptr(arg);
261 if (get_user(len, &iobuf32->length) ||
262 get_user(data, &iobuf32->buffer))
264 datap = compat_ptr(data);
265 if (put_user(len, &iobuf->length) ||
266 put_user(datap, &iobuf->buffer))
269 err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
272 if (copy_in_user(&iobuf32->length, &iobuf->length,
280 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
283 struct atmif_sioc __user *sioc;
284 struct compat_atmif_sioc __user *sioc32;
289 sioc = compat_alloc_user_space(sizeof(*sioc));
290 sioc32 = compat_ptr(arg);
292 if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
293 get_user(data, &sioc32->arg))
295 datap = compat_ptr(data);
296 if (put_user(datap, &sioc->arg))
299 err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
302 if (copy_in_user(&sioc32->length, &sioc->length,
309 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
313 unsigned int cmd = 0;
321 case SONET_SETFRAMING:
322 case SONET_GETFRAMING:
323 case SONET_GETFRSENSE:
324 return do_atmif_sioc(sock, cmd32, arg);
327 for (i = 0; i < NR_ATM_IOCTL; i++) {
328 if (cmd32 == atm_ioctl_map[i].cmd32) {
329 cmd = atm_ioctl_map[i].cmd;
333 if (i == NR_ATM_IOCTL)
338 return do_atm_iobuf(sock, cmd, arg);
340 case ATM_GETLINKRATE:
356 return do_atmif_sioc(sock, cmd, arg);
362 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
367 ret = do_vcc_ioctl(sock, cmd, arg, 1);
368 if (ret != -ENOIOCTLCMD)
371 return do_atm_ioctl(sock, cmd, arg);