net/atm/ioctl.c

   1 /* ATM ioctl handling */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4 /* 2003 John Levon  <levon@movementarian.org> */
   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                 if (net_ratelimit())
 101                         pr_warning("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                         if (net_ratelimit())
 127                                 pr_warning("32-bit task cannot be atmsigd\n");
 128                         error = -EINVAL;
 129                         goto done;
 130                 }
 131 #endif
 132                 error = sigd_attach(vcc);
 133                 if (!error)
 134                         sock->state = SS_CONNECTED;
 135                 goto done;
 136         case ATM_SETBACKEND:
 137         case ATM_NEWBACKENDIF:
 138         {
 139                 atm_backend_t backend;
 140                 error = get_user(backend, (atm_backend_t __user *)argp);
 141                 if (error)
 142                         goto done;
 143                 switch (backend) {
 144                 case ATM_BACKEND_PPP:
 145                         request_module("pppoatm");
 146                         break;
 147                 case ATM_BACKEND_BR2684:
 148                         request_module("br2684");
 149                         break;
 150                 }
 151                 break;
 152         }
 153         case ATMMPC_CTRL:
 154         case ATMMPC_DATA:
 155                 request_module("mpoa");
 156                 break;
 157         case ATMARPD_CTRL:
 158                 request_module("clip");
 159                 break;
 160         case ATMLEC_CTRL:
 161                 request_module("lec");
 162                 break;
 163         }
 164
 165         error = -ENOIOCTLCMD;
 166
 167         mutex_lock(&ioctl_mutex);
 168         list_for_each(pos, &ioctl_list) {
 169                 struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
 170                 if (try_module_get(ic->owner)) {
 171                         error = ic->ioctl(sock, cmd, arg);
 172                         module_put(ic->owner);
 173                         if (error != -ENOIOCTLCMD)
 174                                 break;
 175                 }
 176         }
 177         mutex_unlock(&ioctl_mutex);
 178
 179         if (error != -ENOIOCTLCMD)
 180                 goto done;
 181
 182         error = atm_dev_ioctl(cmd, argp, compat);
 183
 184 done:
 185         return error;
 186 }
 187
 188 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 189 {
 190         return do_vcc_ioctl(sock, cmd, arg, 0);
 191 }
 192
 193 #ifdef CONFIG_COMPAT
 194 /*
 195  * FIXME:
 196  * The compat_ioctl handling is duplicated, using both these conversion
 197  * routines and the compat argument to the actual handlers. Both
 198  * versions are somewhat incomplete and should be merged, e.g. by
 199  * moving the ioctl number translation into the actual handlers and
 200  * killing the conversion code.
 201  *
 202  * -arnd, November 2009
 203  */
 204 #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
 205 #define ATM_GETNAMES32    _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
 206 #define ATM_GETTYPE32     _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
 207 #define ATM_GETESI32      _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
 208 #define ATM_GETADDR32     _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
 209 #define ATM_RSTADDR32     _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
 210 #define ATM_ADDADDR32     _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
 211 #define ATM_DELADDR32     _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
 212 #define ATM_GETCIRANGE32  _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
 213 #define ATM_SETCIRANGE32  _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
 214 #define ATM_SETESI32      _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
 215 #define ATM_SETESIF32     _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
 216 #define ATM_GETSTAT32     _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
 217 #define ATM_GETSTATZ32    _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
 218 #define ATM_GETLOOP32     _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
 219 #define ATM_SETLOOP32     _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
 220 #define ATM_QUERYLOOP32   _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
 221
 222 static struct {
 223         unsigned int cmd32;
 224         unsigned int cmd;
 225 } atm_ioctl_map[] = {
 226         { ATM_GETLINKRATE32, ATM_GETLINKRATE },
 227         { ATM_GETNAMES32,    ATM_GETNAMES },
 228         { ATM_GETTYPE32,     ATM_GETTYPE },
 229         { ATM_GETESI32,      ATM_GETESI },
 230         { ATM_GETADDR32,     ATM_GETADDR },
 231         { ATM_RSTADDR32,     ATM_RSTADDR },
 232         { ATM_ADDADDR32,     ATM_ADDADDR },
 233         { ATM_DELADDR32,     ATM_DELADDR },
 234         { ATM_GETCIRANGE32,  ATM_GETCIRANGE },
 235         { ATM_SETCIRANGE32,  ATM_SETCIRANGE },
 236         { ATM_SETESI32,      ATM_SETESI },
 237         { ATM_SETESIF32,     ATM_SETESIF },
 238         { ATM_GETSTAT32,     ATM_GETSTAT },
 239         { ATM_GETSTATZ32,    ATM_GETSTATZ },
 240         { ATM_GETLOOP32,     ATM_GETLOOP },
 241         { ATM_SETLOOP32,     ATM_SETLOOP },
 242         { ATM_QUERYLOOP32,   ATM_QUERYLOOP },
 243 };
 244
 245 #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
 246
 247 static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
 248                         unsigned long arg)
 249 {
 250         struct atm_iobuf __user *iobuf;
 251         struct compat_atm_iobuf __user *iobuf32;
 252         u32 data;
 253         void __user *datap;
 254         int len, err;
 255
 256         iobuf = compat_alloc_user_space(sizeof(*iobuf));
 257         iobuf32 = compat_ptr(arg);
 258
 259         if (get_user(len, &iobuf32->length) ||
 260             get_user(data, &iobuf32->buffer))
 261                 return -EFAULT;
 262         datap = compat_ptr(data);
 263         if (put_user(len, &iobuf->length) ||
 264             put_user(datap, &iobuf->buffer))
 265                 return -EFAULT;
 266
 267         err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
 268
 269         if (!err) {
 270                 if (copy_in_user(&iobuf32->length, &iobuf->length,
 271                                  sizeof(int)))
 272                         err = -EFAULT;
 273         }
 274
 275         return err;
 276 }
 277
 278 static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
 279                          unsigned long arg)
 280 {
 281         struct atmif_sioc __user *sioc;
 282         struct compat_atmif_sioc __user *sioc32;
 283         u32 data;
 284         void __user *datap;
 285         int err;
 286
 287         sioc = compat_alloc_user_space(sizeof(*sioc));
 288         sioc32 = compat_ptr(arg);
 289
 290         if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
 291             get_user(data, &sioc32->arg))
 292                 return -EFAULT;
 293         datap = compat_ptr(data);
 294         if (put_user(datap, &sioc->arg))
 295                 return -EFAULT;
 296
 297         err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
 298
 299         if (!err) {
 300                 if (copy_in_user(&sioc32->length, &sioc->length,
 301                                  sizeof(int)))
 302                         err = -EFAULT;
 303         }
 304         return err;
 305 }
 306
 307 static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
 308                         unsigned long arg)
 309 {
 310         int i;
 311         unsigned int cmd = 0;
 312
 313         switch (cmd32) {
 314         case SONET_GETSTAT:
 315         case SONET_GETSTATZ:
 316         case SONET_GETDIAG:
 317         case SONET_SETDIAG:
 318         case SONET_CLRDIAG:
 319         case SONET_SETFRAMING:
 320         case SONET_GETFRAMING:
 321         case SONET_GETFRSENSE:
 322                 return do_atmif_sioc(sock, cmd32, arg);
 323         }
 324
 325         for (i = 0; i < NR_ATM_IOCTL; i++) {
 326                 if (cmd32 == atm_ioctl_map[i].cmd32) {
 327                         cmd = atm_ioctl_map[i].cmd;
 328                         break;
 329                 }
 330         }
 331         if (i == NR_ATM_IOCTL)
 332                 return -EINVAL;
 333
 334         switch (cmd) {
 335         case ATM_GETNAMES:
 336                 return do_atm_iobuf(sock, cmd, arg);
 337
 338         case ATM_GETLINKRATE:
 339         case ATM_GETTYPE:
 340         case ATM_GETESI:
 341         case ATM_GETADDR:
 342         case ATM_RSTADDR:
 343         case ATM_ADDADDR:
 344         case ATM_DELADDR:
 345         case ATM_GETCIRANGE:
 346         case ATM_SETCIRANGE:
 347         case ATM_SETESI:
 348         case ATM_SETESIF:
 349         case ATM_GETSTAT:
 350         case ATM_GETSTATZ:
 351         case ATM_GETLOOP:
 352         case ATM_SETLOOP:
 353         case ATM_QUERYLOOP:
 354                 return do_atmif_sioc(sock, cmd, arg);
 355         }
 356
 357         return -EINVAL;
 358 }
 359
 360 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
 361                      unsigned long arg)
 362 {
 363         int ret;
 364
 365         ret = do_vcc_ioctl(sock, cmd, arg, 1);
 366         if (ret != -ENOIOCTLCMD)
 367                 return ret;
 368
 369         return do_atm_ioctl(sock, cmd, arg);
 370 }
 371 #endif