net/atm/ioctl.c

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 101                 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",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