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  87                 net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",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