SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/atm/resources.c

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