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
  11 #include <linux/config.h>
  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 = kmalloc(sizeof(*dev), GFP_KERNEL);
  38         if (!dev)
  39                 return NULL;
  40         memset(dev, 0, sizeof(*dev));
  41         dev->type = type;
  42         dev->signal = ATM_PHY_SIG_UNKNOWN;
  43         dev->link_rate = ATM_OC3_PCR;
  44         spin_lock_init(&dev->lock);
  45         INIT_LIST_HEAD(&dev->local);
  46         INIT_LIST_HEAD(&dev->lecs);
  47
  48         return dev;
  49 }
  50
  51 static struct atm_dev *__atm_dev_lookup(int number)
  52 {
  53         struct atm_dev *dev;
  54         struct list_head *p;
  55
  56         list_for_each(p, &atm_devs) {
  57                 dev = list_entry(p, struct atm_dev, dev_list);
  58                 if (dev->number == number) {
  59                         atm_dev_hold(dev);
  60                         return dev;
  61                 }
  62         }
  63         return NULL;
  64 }
  65
  66 struct atm_dev *atm_dev_lookup(int number)
  67 {
  68         struct atm_dev *dev;
  69
  70         mutex_lock(&atm_dev_mutex);
  71         dev = __atm_dev_lookup(number);
  72         mutex_unlock(&atm_dev_mutex);
  73         return dev;
  74 }
  75
  76
  77 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
  78                                  int number, unsigned long *flags)
  79 {
  80         struct atm_dev *dev, *inuse;
  81
  82         dev = __alloc_atm_dev(type);
  83         if (!dev) {
  84                 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
  85                     type);
  86                 return NULL;
  87         }
  88         mutex_lock(&atm_dev_mutex);
  89         if (number != -1) {
  90                 if ((inuse = __atm_dev_lookup(number))) {
  91                         atm_dev_put(inuse);
  92                         mutex_unlock(&atm_dev_mutex);
  93                         kfree(dev);
  94                         return NULL;
  95                 }
  96                 dev->number = number;
  97         } else {
  98                 dev->number = 0;
  99                 while ((inuse = __atm_dev_lookup(dev->number))) {
 100                         atm_dev_put(inuse);
 101                         dev->number++;
 102                 }
 103         }
 104
 105         dev->ops = ops;
 106         if (flags)
 107                 dev->flags = *flags;
 108         else
 109                 memset(&dev->flags, 0, sizeof(dev->flags));
 110         memset(&dev->stats, 0, sizeof(dev->stats));
 111         atomic_set(&dev->refcnt, 1);
 112
 113         if (atm_proc_dev_register(dev) < 0) {
 114                 printk(KERN_ERR "atm_dev_register: "
 115                        "atm_proc_dev_register failed for dev %s\n",
 116                        type);
 117                 mutex_unlock(&atm_dev_mutex);
 118                 kfree(dev);
 119                 return NULL;
 120         }
 121         list_add_tail(&dev->dev_list, &atm_devs);
 122         mutex_unlock(&atm_dev_mutex);
 123
 124         return dev;
 125 }
 126
 127
 128 void atm_dev_deregister(struct atm_dev *dev)
 129 {
 130         BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
 131         set_bit(ATM_DF_REMOVED, &dev->flags);
 132
 133         /*
 134          * if we remove current device from atm_devs list, new device
 135          * with same number can appear, such we need deregister proc,
 136          * release async all vccs and remove them from vccs list too
 137          */
 138         mutex_lock(&atm_dev_mutex);
 139         list_del(&dev->dev_list);
 140         mutex_unlock(&atm_dev_mutex);
 141
 142         atm_dev_release_vccs(dev);
 143         atm_proc_dev_deregister(dev);
 144
 145         atm_dev_put(dev);
 146 }
 147
 148
 149 static void copy_aal_stats(struct k_atm_aal_stats *from,
 150     struct atm_aal_stats *to)
 151 {
 152 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
 153         __AAL_STAT_ITEMS
 154 #undef __HANDLE_ITEM
 155 }
 156
 157
 158 static void subtract_aal_stats(struct k_atm_aal_stats *from,
 159     struct atm_aal_stats *to)
 160 {
 161 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
 162         __AAL_STAT_ITEMS
 163 #undef __HANDLE_ITEM
 164 }
 165
 166
 167 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
 168 {
 169         struct atm_dev_stats tmp;
 170         int error = 0;
 171
 172         copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
 173         copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
 174         copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
 175         if (arg)
 176                 error = copy_to_user(arg, &tmp, sizeof(tmp));
 177         if (zero && !error) {
 178                 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
 179                 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
 180                 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
 181         }
 182         return error ? -EFAULT : 0;
 183 }
 184
 185
 186 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
 187 {
 188         void __user *buf;
 189         int error, len, number, size = 0;
 190         struct atm_dev *dev;
 191         struct list_head *p;
 192         int *tmp_buf, *tmp_p;
 193         struct atm_iobuf __user *iobuf = arg;
 194         struct atmif_sioc __user *sioc = arg;
 195         switch (cmd) {
 196                 case ATM_GETNAMES:
 197                         if (get_user(buf, &iobuf->buffer))
 198                                 return -EFAULT;
 199                         if (get_user(len, &iobuf->length))
 200                                 return -EFAULT;
 201                         mutex_lock(&atm_dev_mutex);
 202                         list_for_each(p, &atm_devs)
 203                                 size += sizeof(int);
 204                         if (size > len) {
 205                                 mutex_unlock(&atm_dev_mutex);
 206                                 return -E2BIG;
 207                         }
 208                         tmp_buf = kmalloc(size, GFP_ATOMIC);
 209                         if (!tmp_buf) {
 210                                 mutex_unlock(&atm_dev_mutex);
 211                                 return -ENOMEM;
 212                         }
 213                         tmp_p = tmp_buf;
 214                         list_for_each(p, &atm_devs) {
 215                                 dev = list_entry(p, struct atm_dev, dev_list);
 216                                 *tmp_p++ = dev->number;
 217                         }
 218                         mutex_unlock(&atm_dev_mutex);
 219                         error = ((copy_to_user(buf, tmp_buf, size)) ||
 220                                         put_user(size, &iobuf->length))
 221                                                 ? -EFAULT : 0;
 222                         kfree(tmp_buf);
 223                         return error;
 224                 default:
 225                         break;
 226         }
 227
 228         if (get_user(buf, &sioc->arg))
 229                 return -EFAULT;
 230         if (get_user(len, &sioc->length))
 231                 return -EFAULT;
 232         if (get_user(number, &sioc->number))
 233                 return -EFAULT;
 234
 235         if (!(dev = try_then_request_module(atm_dev_lookup(number),
 236                                             "atm-device-%d", number)))
 237                 return -ENODEV;
 238
 239         switch (cmd) {
 240                 case ATM_GETTYPE:
 241                         size = strlen(dev->type) + 1;
 242                         if (copy_to_user(buf, dev->type, size)) {
 243                                 error = -EFAULT;
 244                                 goto done;
 245                         }
 246                         break;
 247                 case ATM_GETESI:
 248                         size = ESI_LEN;
 249                         if (copy_to_user(buf, dev->esi, size)) {
 250                                 error = -EFAULT;
 251                                 goto done;
 252                         }
 253                         break;
 254                 case ATM_SETESI:
 255                         {
 256                                 int i;
 257
 258                                 for (i = 0; i < ESI_LEN; i++)
 259                                         if (dev->esi[i]) {
 260                                                 error = -EEXIST;
 261                                                 goto done;
 262                                         }
 263                         }
 264                         /* fall through */
 265                 case ATM_SETESIF:
 266                         {
 267                                 unsigned char esi[ESI_LEN];
 268
 269                                 if (!capable(CAP_NET_ADMIN)) {
 270                                         error = -EPERM;
 271                                         goto done;
 272                                 }
 273                                 if (copy_from_user(esi, buf, ESI_LEN)) {
 274                                         error = -EFAULT;
 275                                         goto done;
 276                                 }
 277                                 memcpy(dev->esi, esi, ESI_LEN);
 278                                 error =  ESI_LEN;
 279                                 goto done;
 280                         }
 281                 case ATM_GETSTATZ:
 282                         if (!capable(CAP_NET_ADMIN)) {
 283                                 error = -EPERM;
 284                                 goto done;
 285                         }
 286                         /* fall through */
 287                 case ATM_GETSTAT:
 288                         size = sizeof(struct atm_dev_stats);
 289                         error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
 290                         if (error)
 291                                 goto done;
 292                         break;
 293                 case ATM_GETCIRANGE:
 294                         size = sizeof(struct atm_cirange);
 295                         if (copy_to_user(buf, &dev->ci_range, size)) {
 296                                 error = -EFAULT;
 297                                 goto done;
 298                         }
 299                         break;
 300                 case ATM_GETLINKRATE:
 301                         size = sizeof(int);
 302                         if (copy_to_user(buf, &dev->link_rate, size)) {
 303                                 error = -EFAULT;
 304                                 goto done;
 305                         }
 306                         break;
 307                 case ATM_RSTADDR:
 308                         if (!capable(CAP_NET_ADMIN)) {
 309                                 error = -EPERM;
 310                                 goto done;
 311                         }
 312                         atm_reset_addr(dev, ATM_ADDR_LOCAL);
 313                         break;
 314                 case ATM_ADDADDR:
 315                 case ATM_DELADDR:
 316                 case ATM_ADDLECSADDR:
 317                 case ATM_DELLECSADDR:
 318                         if (!capable(CAP_NET_ADMIN)) {
 319                                 error = -EPERM;
 320                                 goto done;
 321                         }
 322                         {
 323                                 struct sockaddr_atmsvc addr;
 324
 325                                 if (copy_from_user(&addr, buf, sizeof(addr))) {
 326                                         error = -EFAULT;
 327                                         goto done;
 328                                 }
 329                                 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
 330                                         error = atm_add_addr(dev, &addr,
 331                                                              (cmd == ATM_ADDADDR ?
 332                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 333                                 else
 334                                         error = atm_del_addr(dev, &addr,
 335                                                              (cmd == ATM_DELADDR ?
 336                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 337                                 goto done;
 338                         }
 339                 case ATM_GETADDR:
 340                 case ATM_GETLECSADDR:
 341                         error = atm_get_addr(dev, buf, len,
 342                                              (cmd == ATM_GETADDR ?
 343                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 344                         if (error < 0)
 345                                 goto done;
 346                         size = error;
 347                         /* may return 0, but later on size == 0 means "don't
 348                            write the length" */
 349                         error = put_user(size, &sioc->length)
 350                                 ? -EFAULT : 0;
 351                         goto done;
 352                 case ATM_SETLOOP:
 353                         if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
 354                             __ATM_LM_XTLOC((int) (unsigned long) buf) >
 355                             __ATM_LM_XTRMT((int) (unsigned long) buf)) {
 356                                 error = -EINVAL;
 357                                 goto done;
 358                         }
 359                         /* fall through */
 360                 case ATM_SETCIRANGE:
 361                 case SONET_GETSTATZ:
 362                 case SONET_SETDIAG:
 363                 case SONET_CLRDIAG:
 364                 case SONET_SETFRAMING:
 365                         if (!capable(CAP_NET_ADMIN)) {
 366                                 error = -EPERM;
 367                                 goto done;
 368                         }
 369                         /* fall through */
 370                 default:
 371                         if (!dev->ops->ioctl) {
 372                                 error = -EINVAL;
 373                                 goto done;
 374                         }
 375                         size = dev->ops->ioctl(dev, cmd, buf);
 376                         if (size < 0) {
 377                                 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
 378                                 goto done;
 379                         }
 380         }
 381
 382         if (size)
 383                 error = put_user(size, &sioc->length)
 384                         ? -EFAULT : 0;
 385         else
 386                 error = 0;
 387 done:
 388         atm_dev_put(dev);
 389         return error;
 390 }
 391
 392 static __inline__ void *dev_get_idx(loff_t left)
 393 {
 394         struct list_head *p;
 395
 396         list_for_each(p, &atm_devs) {
 397                 if (!--left)
 398                         break;
 399         }
 400         return (p != &atm_devs) ? p : NULL;
 401 }
 402
 403 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
 404 {
 405         mutex_lock(&atm_dev_mutex);
 406         return *pos ? dev_get_idx(*pos) : (void *) 1;
 407 }
 408
 409 void atm_dev_seq_stop(struct seq_file *seq, void *v)
 410 {
 411         mutex_unlock(&atm_dev_mutex);
 412 }
 413
 414 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 415 {
 416         ++*pos;
 417         v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
 418         return (v == &atm_devs) ? NULL : v;
 419 }
 420
 421
 422 EXPORT_SYMBOL(atm_dev_register);
 423 EXPORT_SYMBOL(atm_dev_deregister);
 424 EXPORT_SYMBOL(atm_dev_lookup);