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   1 /* net/atm/resources.c - Statically allocated resources */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5 /* Fixes
   6  * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   7  * 2002/01 - don't free the whole struct sock on sk->destruct time,
   8  *           use the default destruct function initialized by sock_init_data */
   9
  10
  11 #include <linux/ctype.h>
  12 #include <linux/string.h>
  13 #include <linux/atmdev.h>
  14 #include <linux/sonet.h>
  15 #include <linux/kernel.h> /* for barrier */
  16 #include <linux/module.h>
  17 #include <linux/bitops.h>
  18 #include <linux/capability.h>
  19 #include <linux/delay.h>
  20 #include <linux/mutex.h>
  21
  22 #include <net/sock.h>    /* for struct sock */
  23
  24 #include "common.h"
  25 #include "resources.h"
  26 #include "addr.h"
  27
  28
  29 LIST_HEAD(atm_devs);
  30 DEFINE_MUTEX(atm_dev_mutex);
  31
  32 static struct atm_dev *__alloc_atm_dev(const char *type)
  33 {
  34         struct atm_dev *dev;
  35
  36         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  37         if (!dev)
  38                 return NULL;
  39         dev->type = type;
  40         dev->signal = ATM_PHY_SIG_UNKNOWN;
  41         dev->link_rate = ATM_OC3_PCR;
  42         spin_lock_init(&dev->lock);
  43         INIT_LIST_HEAD(&dev->local);
  44         INIT_LIST_HEAD(&dev->lecs);
  45
  46         return dev;
  47 }
  48
  49 static struct atm_dev *__atm_dev_lookup(int number)
  50 {
  51         struct atm_dev *dev;
  52         struct list_head *p;
  53
  54         list_for_each(p, &atm_devs) {
  55                 dev = list_entry(p, struct atm_dev, dev_list);
  56                 if (dev->number == number) {
  57                         atm_dev_hold(dev);
  58                         return dev;
  59                 }
  60         }
  61         return NULL;
  62 }
  63
  64 struct atm_dev *atm_dev_lookup(int number)
  65 {
  66         struct atm_dev *dev;
  67
  68         mutex_lock(&atm_dev_mutex);
  69         dev = __atm_dev_lookup(number);
  70         mutex_unlock(&atm_dev_mutex);
  71         return dev;
  72 }
  73
  74
  75 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
  76                                  int number, unsigned long *flags)
  77 {
  78         struct atm_dev *dev, *inuse;
  79
  80         dev = __alloc_atm_dev(type);
  81         if (!dev) {
  82                 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
  83                     type);
  84                 return NULL;
  85         }
  86         mutex_lock(&atm_dev_mutex);
  87         if (number != -1) {
  88                 if ((inuse = __atm_dev_lookup(number))) {
  89                         atm_dev_put(inuse);
  90                         mutex_unlock(&atm_dev_mutex);
  91                         kfree(dev);
  92                         return NULL;
  93                 }
  94                 dev->number = number;
  95         } else {
  96                 dev->number = 0;
  97                 while ((inuse = __atm_dev_lookup(dev->number))) {
  98                         atm_dev_put(inuse);
  99                         dev->number++;
 100                 }
 101         }
 102
 103         dev->ops = ops;
 104         if (flags)
 105                 dev->flags = *flags;
 106         else
 107                 memset(&dev->flags, 0, sizeof(dev->flags));
 108         memset(&dev->stats, 0, sizeof(dev->stats));
 109         atomic_set(&dev->refcnt, 1);
 110
 111         if (atm_proc_dev_register(dev) < 0) {
 112                 printk(KERN_ERR "atm_dev_register: "
 113                        "atm_proc_dev_register failed for dev %s\n",
 114                        type);
 115                 goto out_fail;
 116         }
 117
 118         if (atm_register_sysfs(dev) < 0) {
 119                 printk(KERN_ERR "atm_dev_register: "
 120                        "atm_register_sysfs failed for dev %s\n",
 121                        type);
 122                 atm_proc_dev_deregister(dev);
 123                 goto out_fail;
 124         }
 125
 126         list_add_tail(&dev->dev_list, &atm_devs);
 127
 128 out:
 129         mutex_unlock(&atm_dev_mutex);
 130         return dev;
 131
 132 out_fail:
 133         kfree(dev);
 134         dev = NULL;
 135         goto out;
 136 }
 137
 138
 139 void atm_dev_deregister(struct atm_dev *dev)
 140 {
 141         BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
 142         set_bit(ATM_DF_REMOVED, &dev->flags);
 143
 144         /*
 145          * if we remove current device from atm_devs list, new device
 146          * with same number can appear, such we need deregister proc,
 147          * release async all vccs and remove them from vccs list too
 148          */
 149         mutex_lock(&atm_dev_mutex);
 150         list_del(&dev->dev_list);
 151         mutex_unlock(&atm_dev_mutex);
 152
 153         atm_dev_release_vccs(dev);
 154         atm_unregister_sysfs(dev);
 155         atm_proc_dev_deregister(dev);
 156
 157         atm_dev_put(dev);
 158 }
 159
 160
 161 static void copy_aal_stats(struct k_atm_aal_stats *from,
 162     struct atm_aal_stats *to)
 163 {
 164 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
 165         __AAL_STAT_ITEMS
 166 #undef __HANDLE_ITEM
 167 }
 168
 169
 170 static void subtract_aal_stats(struct k_atm_aal_stats *from,
 171     struct atm_aal_stats *to)
 172 {
 173 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
 174         __AAL_STAT_ITEMS
 175 #undef __HANDLE_ITEM
 176 }
 177
 178
 179 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
 180 {
 181         struct atm_dev_stats tmp;
 182         int error = 0;
 183
 184         copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
 185         copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
 186         copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
 187         if (arg)
 188                 error = copy_to_user(arg, &tmp, sizeof(tmp));
 189         if (zero && !error) {
 190                 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
 191                 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
 192                 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
 193         }
 194         return error ? -EFAULT : 0;
 195 }
 196
 197
 198 int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
 199 {
 200         void __user *buf;
 201         int error, len, number, size = 0;
 202         struct atm_dev *dev;
 203         struct list_head *p;
 204         int *tmp_buf, *tmp_p;
 205         int __user *sioc_len;
 206         int __user *iobuf_len;
 207
 208 #ifndef CONFIG_COMPAT
 209         compat = 0; /* Just so the compiler _knows_ */
 210 #endif
 211
 212         switch (cmd) {
 213                 case ATM_GETNAMES:
 214
 215                         if (compat) {
 216 #ifdef CONFIG_COMPAT
 217                                 struct compat_atm_iobuf __user *ciobuf = arg;
 218                                 compat_uptr_t cbuf;
 219                                 iobuf_len = &ciobuf->length;
 220                                 if (get_user(cbuf, &ciobuf->buffer))
 221                                         return -EFAULT;
 222                                 buf = compat_ptr(cbuf);
 223 #endif
 224                         } else {
 225                                 struct atm_iobuf __user *iobuf = arg;
 226                                 iobuf_len = &iobuf->length;
 227                                 if (get_user(buf, &iobuf->buffer))
 228                                         return -EFAULT;
 229                         }
 230                         if (get_user(len, iobuf_len))
 231                                 return -EFAULT;
 232                         mutex_lock(&atm_dev_mutex);
 233                         list_for_each(p, &atm_devs)
 234                                 size += sizeof(int);
 235                         if (size > len) {
 236                                 mutex_unlock(&atm_dev_mutex);
 237                                 return -E2BIG;
 238                         }
 239                         tmp_buf = kmalloc(size, GFP_ATOMIC);
 240                         if (!tmp_buf) {
 241                                 mutex_unlock(&atm_dev_mutex);
 242                                 return -ENOMEM;
 243                         }
 244                         tmp_p = tmp_buf;
 245                         list_for_each(p, &atm_devs) {
 246                                 dev = list_entry(p, struct atm_dev, dev_list);
 247                                 *tmp_p++ = dev->number;
 248                         }
 249                         mutex_unlock(&atm_dev_mutex);
 250                         error = ((copy_to_user(buf, tmp_buf, size)) ||
 251                                         put_user(size, iobuf_len))
 252                                                 ? -EFAULT : 0;
 253                         kfree(tmp_buf);
 254                         return error;
 255                 default:
 256                         break;
 257         }
 258
 259         if (compat) {
 260 #ifdef CONFIG_COMPAT
 261                 struct compat_atmif_sioc __user *csioc = arg;
 262                 compat_uptr_t carg;
 263
 264                 sioc_len = &csioc->length;
 265                 if (get_user(carg, &csioc->arg))
 266                         return -EFAULT;
 267                 buf = compat_ptr(carg);
 268
 269                 if (get_user(len, &csioc->length))
 270                         return -EFAULT;
 271                 if (get_user(number, &csioc->number))
 272                         return -EFAULT;
 273 #endif
 274         } else {
 275                 struct atmif_sioc __user *sioc = arg;
 276
 277                 sioc_len = &sioc->length;
 278                 if (get_user(buf, &sioc->arg))
 279                         return -EFAULT;
 280                 if (get_user(len, &sioc->length))
 281                         return -EFAULT;
 282                 if (get_user(number, &sioc->number))
 283                         return -EFAULT;
 284         }
 285         if (!(dev = try_then_request_module(atm_dev_lookup(number),
 286                                             "atm-device-%d", number)))
 287                 return -ENODEV;
 288
 289         switch (cmd) {
 290                 case ATM_GETTYPE:
 291                         size = strlen(dev->type) + 1;
 292                         if (copy_to_user(buf, dev->type, size)) {
 293                                 error = -EFAULT;
 294                                 goto done;
 295                         }
 296                         break;
 297                 case ATM_GETESI:
 298                         size = ESI_LEN;
 299                         if (copy_to_user(buf, dev->esi, size)) {
 300                                 error = -EFAULT;
 301                                 goto done;
 302                         }
 303                         break;
 304                 case ATM_SETESI:
 305                         {
 306                                 int i;
 307
 308                                 for (i = 0; i < ESI_LEN; i++)
 309                                         if (dev->esi[i]) {
 310                                                 error = -EEXIST;
 311                                                 goto done;
 312                                         }
 313                         }
 314                         /* fall through */
 315                 case ATM_SETESIF:
 316                         {
 317                                 unsigned char esi[ESI_LEN];
 318
 319                                 if (!capable(CAP_NET_ADMIN)) {
 320                                         error = -EPERM;
 321                                         goto done;
 322                                 }
 323                                 if (copy_from_user(esi, buf, ESI_LEN)) {
 324                                         error = -EFAULT;
 325                                         goto done;
 326                                 }
 327                                 memcpy(dev->esi, esi, ESI_LEN);
 328                                 error =  ESI_LEN;
 329                                 goto done;
 330                         }
 331                 case ATM_GETSTATZ:
 332                         if (!capable(CAP_NET_ADMIN)) {
 333                                 error = -EPERM;
 334                                 goto done;
 335                         }
 336                         /* fall through */
 337                 case ATM_GETSTAT:
 338                         size = sizeof(struct atm_dev_stats);
 339                         error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
 340                         if (error)
 341                                 goto done;
 342                         break;
 343                 case ATM_GETCIRANGE:
 344                         size = sizeof(struct atm_cirange);
 345                         if (copy_to_user(buf, &dev->ci_range, size)) {
 346                                 error = -EFAULT;
 347                                 goto done;
 348                         }
 349                         break;
 350                 case ATM_GETLINKRATE:
 351                         size = sizeof(int);
 352                         if (copy_to_user(buf, &dev->link_rate, size)) {
 353                                 error = -EFAULT;
 354                                 goto done;
 355                         }
 356                         break;
 357                 case ATM_RSTADDR:
 358                         if (!capable(CAP_NET_ADMIN)) {
 359                                 error = -EPERM;
 360                                 goto done;
 361                         }
 362                         atm_reset_addr(dev, ATM_ADDR_LOCAL);
 363                         break;
 364                 case ATM_ADDADDR:
 365                 case ATM_DELADDR:
 366                 case ATM_ADDLECSADDR:
 367                 case ATM_DELLECSADDR:
 368                         if (!capable(CAP_NET_ADMIN)) {
 369                                 error = -EPERM;
 370                                 goto done;
 371                         }
 372                         {
 373                                 struct sockaddr_atmsvc addr;
 374
 375                                 if (copy_from_user(&addr, buf, sizeof(addr))) {
 376                                         error = -EFAULT;
 377                                         goto done;
 378                                 }
 379                                 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
 380                                         error = atm_add_addr(dev, &addr,
 381                                                              (cmd == ATM_ADDADDR ?
 382                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 383                                 else
 384                                         error = atm_del_addr(dev, &addr,
 385                                                              (cmd == ATM_DELADDR ?
 386                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 387                                 goto done;
 388                         }
 389                 case ATM_GETADDR:
 390                 case ATM_GETLECSADDR:
 391                         error = atm_get_addr(dev, buf, len,
 392                                              (cmd == ATM_GETADDR ?
 393                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 394                         if (error < 0)
 395                                 goto done;
 396                         size = error;
 397                         /* may return 0, but later on size == 0 means "don't
 398                            write the length" */
 399                         error = put_user(size, sioc_len)
 400                                 ? -EFAULT : 0;
 401                         goto done;
 402                 case ATM_SETLOOP:
 403                         if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
 404                             __ATM_LM_XTLOC((int) (unsigned long) buf) >
 405                             __ATM_LM_XTRMT((int) (unsigned long) buf)) {
 406                                 error = -EINVAL;
 407                                 goto done;
 408                         }
 409                         /* fall through */
 410                 case ATM_SETCIRANGE:
 411                 case SONET_GETSTATZ:
 412                 case SONET_SETDIAG:
 413                 case SONET_CLRDIAG:
 414                 case SONET_SETFRAMING:
 415                         if (!capable(CAP_NET_ADMIN)) {
 416                                 error = -EPERM;
 417                                 goto done;
 418                         }
 419                         /* fall through */
 420                 default:
 421                         if (compat) {
 422 #ifdef CONFIG_COMPAT
 423                                 if (!dev->ops->compat_ioctl) {
 424                                         error = -EINVAL;
 425                                         goto done;
 426                                 }
 427                                 size = dev->ops->compat_ioctl(dev, cmd, buf);
 428 #endif
 429                         } else {
 430                                 if (!dev->ops->ioctl) {
 431                                         error = -EINVAL;
 432                                         goto done;
 433                                 }
 434                                 size = dev->ops->ioctl(dev, cmd, buf);
 435                         }
 436                         if (size < 0) {
 437                                 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
 438                                 goto done;
 439                         }
 440         }
 441
 442         if (size)
 443                 error = put_user(size, sioc_len)
 444                         ? -EFAULT : 0;
 445         else
 446                 error = 0;
 447 done:
 448         atm_dev_put(dev);
 449         return error;
 450 }
 451
 452 static __inline__ void *dev_get_idx(loff_t left)
 453 {
 454         struct list_head *p;
 455
 456         list_for_each(p, &atm_devs) {
 457                 if (!--left)
 458                         break;
 459         }
 460         return (p != &atm_devs) ? p : NULL;
 461 }
 462
 463 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
 464 {
 465         mutex_lock(&atm_dev_mutex);
 466         return *pos ? dev_get_idx(*pos) : SEQ_START_TOKEN;
 467 }
 468
 469 void atm_dev_seq_stop(struct seq_file *seq, void *v)
 470 {
 471         mutex_unlock(&atm_dev_mutex);
 472 }
 473
 474 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 475 {
 476         ++*pos;
 477         v = (v == SEQ_START_TOKEN)
 478                 ? atm_devs.next : ((struct list_head *)v)->next;
 479         return (v == &atm_devs) ? NULL : v;
 480 }
 481
 482
 483 EXPORT_SYMBOL(atm_dev_register);
 484 EXPORT_SYMBOL(atm_dev_deregister);
 485 EXPORT_SYMBOL(atm_dev_lookup);