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);
  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);
  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
 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
 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
 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
 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
 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