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/delay.h>
  20 #include <net/sock.h>    /* for struct sock */
  21
  22 #include "common.h"
  23 #include "resources.h"
  24 #include "addr.h"
  25
  26
  27 LIST_HEAD(atm_devs);
  28 DEFINE_SPINLOCK(atm_dev_lock);
  29
  30 static struct atm_dev *__alloc_atm_dev(const char *type)
  31 {
  32         struct atm_dev *dev;
  33
  34         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
  35         if (!dev)
  36                 return NULL;
  37         memset(dev, 0, sizeof(*dev));
  38         dev->type = type;
  39         dev->signal = ATM_PHY_SIG_UNKNOWN;
  40         dev->link_rate = ATM_OC3_PCR;
  41         spin_lock_init(&dev->lock);
  42         INIT_LIST_HEAD(&dev->local);
  43         INIT_LIST_HEAD(&dev->lecs);
  44
  45         return dev;
  46 }
  47
  48 static struct atm_dev *__atm_dev_lookup(int number)
  49 {
  50         struct atm_dev *dev;
  51         struct list_head *p;
  52
  53         list_for_each(p, &atm_devs) {
  54                 dev = list_entry(p, struct atm_dev, dev_list);
  55                 if ((dev->ops) && (dev->number == number)) {
  56                         atm_dev_hold(dev);
  57                         return dev;
  58                 }
  59         }
  60         return NULL;
  61 }
  62
  63 struct atm_dev *atm_dev_lookup(int number)
  64 {
  65         struct atm_dev *dev;
  66
  67         spin_lock(&atm_dev_lock);
  68         dev = __atm_dev_lookup(number);
  69         spin_unlock(&atm_dev_lock);
  70         return dev;
  71 }
  72
  73 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
  74                                  int number, unsigned long *flags)
  75 {
  76         struct atm_dev *dev, *inuse;
  77
  78         dev = __alloc_atm_dev(type);
  79         if (!dev) {
  80                 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
  81                     type);
  82                 return NULL;
  83         }
  84         spin_lock(&atm_dev_lock);
  85         if (number != -1) {
  86                 if ((inuse = __atm_dev_lookup(number))) {
  87                         atm_dev_put(inuse);
  88                         spin_unlock(&atm_dev_lock);
  89                         kfree(dev);
  90                         return NULL;
  91                 }
  92                 dev->number = number;
  93         } else {
  94                 dev->number = 0;
  95                 while ((inuse = __atm_dev_lookup(dev->number))) {
  96                         atm_dev_put(inuse);
  97                         dev->number++;
  98                 }
  99         }
 100
 101         dev->ops = ops;
 102         if (flags)
 103                 dev->flags = *flags;
 104         else
 105                 memset(&dev->flags, 0, sizeof(dev->flags));
 106         memset(&dev->stats, 0, sizeof(dev->stats));
 107         atomic_set(&dev->refcnt, 1);
 108         list_add_tail(&dev->dev_list, &atm_devs);
 109         spin_unlock(&atm_dev_lock);
 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                 spin_lock(&atm_dev_lock);
 116                 list_del(&dev->dev_list);
 117                 spin_unlock(&atm_dev_lock);
 118                 kfree(dev);
 119                 return NULL;
 120         }
 121
 122         return dev;
 123 }
 124
 125
 126 void atm_dev_deregister(struct atm_dev *dev)
 127 {
 128         unsigned long warning_time;
 129
 130         atm_proc_dev_deregister(dev);
 131
 132         spin_lock(&atm_dev_lock);
 133         list_del(&dev->dev_list);
 134         spin_unlock(&atm_dev_lock);
 135
 136         warning_time = jiffies;
 137         while (atomic_read(&dev->refcnt) != 1) {
 138                 msleep(250);
 139                 if ((jiffies - warning_time) > 10 * HZ) {
 140                         printk(KERN_EMERG "atm_dev_deregister: waiting for "
 141                                "dev %d to become free. Usage count = %d\n",
 142                                dev->number, atomic_read(&dev->refcnt));
 143                         warning_time = jiffies;
 144                 }
 145         }
 146
 147         kfree(dev);
 148 }
 149
 150 void shutdown_atm_dev(struct atm_dev *dev)
 151 {
 152         if (atomic_read(&dev->refcnt) > 1) {
 153                 set_bit(ATM_DF_CLOSE, &dev->flags);
 154                 return;
 155         }
 156         if (dev->ops->dev_close)
 157                 dev->ops->dev_close(dev);
 158         atm_dev_deregister(dev);
 159 }
 160
 161
 162 static void copy_aal_stats(struct k_atm_aal_stats *from,
 163     struct atm_aal_stats *to)
 164 {
 165 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
 166         __AAL_STAT_ITEMS
 167 #undef __HANDLE_ITEM
 168 }
 169
 170
 171 static void subtract_aal_stats(struct k_atm_aal_stats *from,
 172     struct atm_aal_stats *to)
 173 {
 174 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
 175         __AAL_STAT_ITEMS
 176 #undef __HANDLE_ITEM
 177 }
 178
 179
 180 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
 181 {
 182         struct atm_dev_stats tmp;
 183         int error = 0;
 184
 185         copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
 186         copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
 187         copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
 188         if (arg)
 189                 error = copy_to_user(arg, &tmp, sizeof(tmp));
 190         if (zero && !error) {
 191                 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
 192                 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
 193                 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
 194         }
 195         return error ? -EFAULT : 0;
 196 }
 197
 198
 199 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
 200 {
 201         void __user *buf;
 202         int error, len, number, size = 0;
 203         struct atm_dev *dev;
 204         struct list_head *p;
 205         int *tmp_buf, *tmp_p;
 206         struct atm_iobuf __user *iobuf = arg;
 207         struct atmif_sioc __user *sioc = arg;
 208         switch (cmd) {
 209                 case ATM_GETNAMES:
 210                         if (get_user(buf, &iobuf->buffer))
 211                                 return -EFAULT;
 212                         if (get_user(len, &iobuf->length))
 213                                 return -EFAULT;
 214                         spin_lock(&atm_dev_lock);
 215                         list_for_each(p, &atm_devs)
 216                                 size += sizeof(int);
 217                         if (size > len) {
 218                                 spin_unlock(&atm_dev_lock);
 219                                 return -E2BIG;
 220                         }
 221                         tmp_buf = kmalloc(size, GFP_ATOMIC);
 222                         if (!tmp_buf) {
 223                                 spin_unlock(&atm_dev_lock);
 224                                 return -ENOMEM;
 225                         }
 226                         tmp_p = tmp_buf;
 227                         list_for_each(p, &atm_devs) {
 228                                 dev = list_entry(p, struct atm_dev, dev_list);
 229                                 *tmp_p++ = dev->number;
 230                         }
 231                         spin_unlock(&atm_dev_lock);
 232                         error = ((copy_to_user(buf, tmp_buf, size)) ||
 233                                         put_user(size, &iobuf->length))
 234                                                 ? -EFAULT : 0;
 235                         kfree(tmp_buf);
 236                         return error;
 237                 default:
 238                         break;
 239         }
 240
 241         if (get_user(buf, &sioc->arg))
 242                 return -EFAULT;
 243         if (get_user(len, &sioc->length))
 244                 return -EFAULT;
 245         if (get_user(number, &sioc->number))
 246                 return -EFAULT;
 247
 248         if (!(dev = atm_dev_lookup(number)))
 249                 return -ENODEV;
 250
 251         switch (cmd) {
 252                 case ATM_GETTYPE:
 253                         size = strlen(dev->type) + 1;
 254                         if (copy_to_user(buf, dev->type, size)) {
 255                                 error = -EFAULT;
 256                                 goto done;
 257                         }
 258                         break;
 259                 case ATM_GETESI:
 260                         size = ESI_LEN;
 261                         if (copy_to_user(buf, dev->esi, size)) {
 262                                 error = -EFAULT;
 263                                 goto done;
 264                         }
 265                         break;
 266                 case ATM_SETESI:
 267                         {
 268                                 int i;
 269
 270                                 for (i = 0; i < ESI_LEN; i++)
 271                                         if (dev->esi[i]) {
 272                                                 error = -EEXIST;
 273                                                 goto done;
 274                                         }
 275                         }
 276                         /* fall through */
 277                 case ATM_SETESIF:
 278                         {
 279                                 unsigned char esi[ESI_LEN];
 280
 281                                 if (!capable(CAP_NET_ADMIN)) {
 282                                         error = -EPERM;
 283                                         goto done;
 284                                 }
 285                                 if (copy_from_user(esi, buf, ESI_LEN)) {
 286                                         error = -EFAULT;
 287                                         goto done;
 288                                 }
 289                                 memcpy(dev->esi, esi, ESI_LEN);
 290                                 error =  ESI_LEN;
 291                                 goto done;
 292                         }
 293                 case ATM_GETSTATZ:
 294                         if (!capable(CAP_NET_ADMIN)) {
 295                                 error = -EPERM;
 296                                 goto done;
 297                         }
 298                         /* fall through */
 299                 case ATM_GETSTAT:
 300                         size = sizeof(struct atm_dev_stats);
 301                         error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
 302                         if (error)
 303                                 goto done;
 304                         break;
 305                 case ATM_GETCIRANGE:
 306                         size = sizeof(struct atm_cirange);
 307                         if (copy_to_user(buf, &dev->ci_range, size)) {
 308                                 error = -EFAULT;
 309                                 goto done;
 310                         }
 311                         break;
 312                 case ATM_GETLINKRATE:
 313                         size = sizeof(int);
 314                         if (copy_to_user(buf, &dev->link_rate, size)) {
 315                                 error = -EFAULT;
 316                                 goto done;
 317                         }
 318                         break;
 319                 case ATM_RSTADDR:
 320                         if (!capable(CAP_NET_ADMIN)) {
 321                                 error = -EPERM;
 322                                 goto done;
 323                         }
 324                         atm_reset_addr(dev, ATM_ADDR_LOCAL);
 325                         break;
 326                 case ATM_ADDADDR:
 327                 case ATM_DELADDR:
 328                 case ATM_ADDLECSADDR:
 329                 case ATM_DELLECSADDR:
 330                         if (!capable(CAP_NET_ADMIN)) {
 331                                 error = -EPERM;
 332                                 goto done;
 333                         }
 334                         {
 335                                 struct sockaddr_atmsvc addr;
 336
 337                                 if (copy_from_user(&addr, buf, sizeof(addr))) {
 338                                         error = -EFAULT;
 339                                         goto done;
 340                                 }
 341                                 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
 342                                         error = atm_add_addr(dev, &addr,
 343                                                              (cmd == ATM_ADDADDR ?
 344                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 345                                 else
 346                                         error = atm_del_addr(dev, &addr,
 347                                                              (cmd == ATM_DELADDR ?
 348                                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 349                                 goto done;
 350                         }
 351                 case ATM_GETADDR:
 352                 case ATM_GETLECSADDR:
 353                         error = atm_get_addr(dev, buf, len,
 354                                              (cmd == ATM_GETADDR ?
 355                                               ATM_ADDR_LOCAL : ATM_ADDR_LECS));
 356                         if (error < 0)
 357                                 goto done;
 358                         size = error;
 359                         /* may return 0, but later on size == 0 means "don't
 360                            write the length" */
 361                         error = put_user(size, &sioc->length)
 362                                 ? -EFAULT : 0;
 363                         goto done;
 364                 case ATM_SETLOOP:
 365                         if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
 366                             __ATM_LM_XTLOC((int) (unsigned long) buf) >
 367                             __ATM_LM_XTRMT((int) (unsigned long) buf)) {
 368                                 error = -EINVAL;
 369                                 goto done;
 370                         }
 371                         /* fall through */
 372                 case ATM_SETCIRANGE:
 373                 case SONET_GETSTATZ:
 374                 case SONET_SETDIAG:
 375                 case SONET_CLRDIAG:
 376                 case SONET_SETFRAMING:
 377                         if (!capable(CAP_NET_ADMIN)) {
 378                                 error = -EPERM;
 379                                 goto done;
 380                         }
 381                         /* fall through */
 382                 default:
 383                         if (!dev->ops->ioctl) {
 384                                 error = -EINVAL;
 385                                 goto done;
 386                         }
 387                         size = dev->ops->ioctl(dev, cmd, buf);
 388                         if (size < 0) {
 389                                 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
 390                                 goto done;
 391                         }
 392         }
 393
 394         if (size)
 395                 error = put_user(size, &sioc->length)
 396                         ? -EFAULT : 0;
 397         else
 398                 error = 0;
 399 done:
 400         atm_dev_put(dev);
 401         return error;
 402 }
 403
 404 static __inline__ void *dev_get_idx(loff_t left)
 405 {
 406         struct list_head *p;
 407
 408         list_for_each(p, &atm_devs) {
 409                 if (!--left)
 410                         break;
 411         }
 412         return (p != &atm_devs) ? p : NULL;
 413 }
 414
 415 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
 416 {
 417         spin_lock(&atm_dev_lock);
 418         return *pos ? dev_get_idx(*pos) : (void *) 1;
 419 }
 420
 421 void atm_dev_seq_stop(struct seq_file *seq, void *v)
 422 {
 423         spin_unlock(&atm_dev_lock);
 424 }
 425
 426 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 427 {
 428         ++*pos;
 429         v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
 430         return (v == &atm_devs) ? NULL : v;
 431 }
 432
 433
 434 EXPORT_SYMBOL(atm_dev_register);
 435 EXPORT_SYMBOL(atm_dev_deregister);
 436 EXPORT_SYMBOL(atm_dev_lookup);
 437 EXPORT_SYMBOL(shutdown_atm_dev);