net/decnet/sysctl_net_decnet.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet sysctl support functions
   7  *
   8  * Author:      Steve Whitehouse <SteveW@ACM.org>
   9  *
  10  *
  11  * Changes:
  12  * Steve Whitehouse - C99 changes and default device handling
  13  *
  14  */
  15 #include <linux/config.h>
  16 #include <linux/mm.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/fs.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/string.h>
  21 #include <net/neighbour.h>
  22 #include <net/dst.h>
  23 #include <net/flow.h>
  24
  25 #include <asm/uaccess.h>
  26
  27 #include <net/dn.h>
  28 #include <net/dn_dev.h>
  29 #include <net/dn_route.h>
  30
  31
  32 int decnet_debug_level;
  33 int decnet_time_wait = 30;
  34 int decnet_dn_count = 1;
  35 int decnet_di_count = 3;
  36 int decnet_dr_count = 3;
  37 int decnet_log_martians = 1;
  38 int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
  39
  40 #ifdef CONFIG_SYSCTL
  41 extern int decnet_dst_gc_interval;
  42 static int min_decnet_time_wait[] = { 5 };
  43 static int max_decnet_time_wait[] = { 600 };
  44 static int min_state_count[] = { 1 };
  45 static int max_state_count[] = { NSP_MAXRXTSHIFT };
  46 static int min_decnet_dst_gc_interval[] = { 1 };
  47 static int max_decnet_dst_gc_interval[] = { 60 };
  48 static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
  49 static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
  50 static char node_name[7] = "???";
  51
  52 static struct ctl_table_header *dn_table_header = NULL;
  53
  54 /*
  55  * ctype.h :-)
  56  */
  57 #define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
  58 #define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
  59 #define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
  60 #define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
  61 #define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
  62
  63 static void strip_it(char *str)
  64 {
  65         for(;;) {
  66                 switch(*str) {
  67                         case ' ':
  68                         case '\n':
  69                         case '\r':
  70                         case ':':
  71                                 *str = 0;
  72                         case 0:
  73                                 return;
  74                 }
  75                 str++;
  76         }
  77 }
  78
  79 /*
  80  * Simple routine to parse an ascii DECnet address
  81  * into a network order address.
  82  */
  83 static int parse_addr(dn_address *addr, char *str)
  84 {
  85         dn_address area, node;
  86
  87         while(*str && !ISNUM(*str)) str++;
  88
  89         if (*str == 0)
  90                 return -1;
  91
  92         area = (*str++ - '0');
  93         if (ISNUM(*str)) {
  94                 area *= 10;
  95                 area += (*str++ - '0');
  96         }
  97
  98         if (*str++ != '.')
  99                 return -1;
 100
 101         if (!ISNUM(*str))
 102                 return -1;
 103
 104         node = *str++ - '0';
 105         if (ISNUM(*str)) {
 106                 node *= 10;
 107                 node += (*str++ - '0');
 108         }
 109         if (ISNUM(*str)) {
 110                 node *= 10;
 111                 node += (*str++ - '0');
 112         }
 113         if (ISNUM(*str)) {
 114                 node *= 10;
 115                 node += (*str++ - '0');
 116         }
 117
 118         if ((node > 1023) || (area > 63))
 119                 return -1;
 120
 121         if (INVALID_END_CHAR(*str))
 122                 return -1;
 123
 124         *addr = dn_htons((area << 10) | node);
 125
 126         return 0;
 127 }
 128
 129
 130 static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
 131                                 void __user *oldval, size_t __user *oldlenp,
 132                                 void __user *newval, size_t newlen,
 133                                 void **context)
 134 {
 135         size_t len;
 136         dn_address addr;
 137
 138         if (oldval && oldlenp) {
 139                 if (get_user(len, oldlenp))
 140                         return -EFAULT;
 141                 if (len) {
 142                         if (len != sizeof(unsigned short))
 143                                 return -EINVAL;
 144                         if (put_user(decnet_address, (unsigned short __user *)oldval))
 145                                 return -EFAULT;
 146                 }
 147         }
 148         if (newval && newlen) {
 149                 if (newlen != sizeof(unsigned short))
 150                         return -EINVAL;
 151                 if (get_user(addr, (unsigned short __user *)newval))
 152                         return -EFAULT;
 153
 154                 dn_dev_devices_off();
 155
 156                 decnet_address = addr;
 157
 158                 dn_dev_devices_on();
 159         }
 160         return 0;
 161 }
 162
 163 static int dn_node_address_handler(ctl_table *table, int write,
 164                                 struct file *filp,
 165                                 void __user *buffer,
 166                                 size_t *lenp, loff_t *ppos)
 167 {
 168         char addr[DN_ASCBUF_LEN];
 169         size_t len;
 170         dn_address dnaddr;
 171
 172         if (!*lenp || (*ppos && !write)) {
 173                 *lenp = 0;
 174                 return 0;
 175         }
 176
 177         if (write) {
 178                 int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
 179
 180                 if (copy_from_user(addr, buffer, len))
 181                         return -EFAULT;
 182
 183                 addr[len] = 0;
 184                 strip_it(addr);
 185
 186                 if (parse_addr(&dnaddr, addr))
 187                         return -EINVAL;
 188
 189                 dn_dev_devices_off();
 190
 191                 decnet_address = dnaddr;
 192
 193                 dn_dev_devices_on();
 194
 195                 *ppos += len;
 196
 197                 return 0;
 198         }
 199
 200         dn_addr2asc(dn_ntohs(decnet_address), addr);
 201         len = strlen(addr);
 202         addr[len++] = '\n';
 203
 204         if (len > *lenp) len = *lenp;
 205
 206         if (copy_to_user(buffer, addr, len))
 207                 return -EFAULT;
 208
 209         *lenp = len;
 210         *ppos += len;
 211
 212         return 0;
 213 }
 214
 215
 216 static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
 217                                 void __user *oldval, size_t __user *oldlenp,
 218                                 void __user *newval, size_t newlen,
 219                                 void **context)
 220 {
 221         size_t len;
 222         struct net_device *dev;
 223         char devname[17];
 224         size_t namel;
 225         int rv = 0;
 226
 227         devname[0] = 0;
 228
 229         if (oldval && oldlenp) {
 230                 if (get_user(len, oldlenp))
 231                         return -EFAULT;
 232                 if (len) {
 233                         dev = dn_dev_get_default();
 234                         if (dev) {
 235                                 strcpy(devname, dev->name);
 236                                 dev_put(dev);
 237                         }
 238
 239                         namel = strlen(devname) + 1;
 240                         if (len > namel) len = namel;
 241
 242                         if (copy_to_user(oldval, devname, len))
 243                                 return -EFAULT;
 244
 245                         if (put_user(len, oldlenp))
 246                                 return -EFAULT;
 247                 }
 248         }
 249
 250         if (newval && newlen) {
 251                 if (newlen > 16)
 252                         return -E2BIG;
 253
 254                 if (copy_from_user(devname, newval, newlen))
 255                         return -EFAULT;
 256
 257                 devname[newlen] = 0;
 258
 259                 dev = dev_get_by_name(devname);
 260                 if (dev == NULL)
 261                         return -ENODEV;
 262
 263                 rv = -ENODEV;
 264                 if (dev->dn_ptr != NULL) {
 265                         rv = dn_dev_set_default(dev, 1);
 266                         if (rv)
 267                                 dev_put(dev);
 268                 }
 269         }
 270
 271         return rv;
 272 }
 273
 274
 275 static int dn_def_dev_handler(ctl_table *table, int write,
 276                                 struct file * filp,
 277                                 void __user *buffer,
 278                                 size_t *lenp, loff_t *ppos)
 279 {
 280         size_t len;
 281         struct net_device *dev;
 282         char devname[17];
 283
 284         if (!*lenp || (*ppos && !write)) {
 285                 *lenp = 0;
 286                 return 0;
 287         }
 288
 289         if (write) {
 290                 if (*lenp > 16)
 291                         return -E2BIG;
 292
 293                 if (copy_from_user(devname, buffer, *lenp))
 294                         return -EFAULT;
 295
 296                 devname[*lenp] = 0;
 297                 strip_it(devname);
 298
 299                 dev = dev_get_by_name(devname);
 300                 if (dev == NULL)
 301                         return -ENODEV;
 302
 303                 if (dev->dn_ptr == NULL) {
 304                         dev_put(dev);
 305                         return -ENODEV;
 306                 }
 307
 308                 if (dn_dev_set_default(dev, 1)) {
 309                         dev_put(dev);
 310                         return -ENODEV;
 311                 }
 312                 *ppos += *lenp;
 313
 314                 return 0;
 315         }
 316
 317         dev = dn_dev_get_default();
 318         if (dev == NULL) {
 319                 *lenp = 0;
 320                 return 0;
 321         }
 322
 323         strcpy(devname, dev->name);
 324         dev_put(dev);
 325         len = strlen(devname);
 326         devname[len++] = '\n';
 327
 328         if (len > *lenp) len = *lenp;
 329
 330         if (copy_to_user(buffer, devname, len))
 331                 return -EFAULT;
 332
 333         *lenp = len;
 334         *ppos += len;
 335
 336         return 0;
 337 }
 338
 339 static ctl_table dn_table[] = {
 340         {
 341                 .ctl_name = NET_DECNET_NODE_ADDRESS,
 342                 .procname = "node_address",
 343                 .maxlen = 7,
 344                 .mode = 0644,
 345                 .proc_handler = dn_node_address_handler,
 346                 .strategy = dn_node_address_strategy,
 347         },
 348         {
 349                 .ctl_name = NET_DECNET_NODE_NAME,
 350                 .procname = "node_name",
 351                 .data = node_name,
 352                 .maxlen = 7,
 353                 .mode = 0644,
 354                 .proc_handler = &proc_dostring,
 355                 .strategy = &sysctl_string,
 356         },
 357         {
 358                 .ctl_name = NET_DECNET_DEFAULT_DEVICE,
 359                 .procname = "default_device",
 360                 .maxlen = 16,
 361                 .mode = 0644,
 362                 .proc_handler = dn_def_dev_handler,
 363                 .strategy = dn_def_dev_strategy,
 364         },
 365         {
 366                 .ctl_name = NET_DECNET_TIME_WAIT,
 367                 .procname = "time_wait",
 368                 .data = &decnet_time_wait,
 369                 .maxlen = sizeof(int),
 370                 .mode = 0644,
 371                 .proc_handler = &proc_dointvec_minmax,
 372                 .strategy = &sysctl_intvec,
 373                 .extra1 = &min_decnet_time_wait,
 374                 .extra2 = &max_decnet_time_wait
 375         },
 376         {
 377                 .ctl_name = NET_DECNET_DN_COUNT,
 378                 .procname = "dn_count",
 379                 .data = &decnet_dn_count,
 380                 .maxlen = sizeof(int),
 381                 .mode = 0644,
 382                 .proc_handler = &proc_dointvec_minmax,
 383                 .strategy = &sysctl_intvec,
 384                 .extra1 = &min_state_count,
 385                 .extra2 = &max_state_count
 386         },
 387         {
 388                 .ctl_name = NET_DECNET_DI_COUNT,
 389                 .procname = "di_count",
 390                 .data = &decnet_di_count,
 391                 .maxlen = sizeof(int),
 392                 .mode = 0644,
 393                 .proc_handler = &proc_dointvec_minmax,
 394                 .strategy = &sysctl_intvec,
 395                 .extra1 = &min_state_count,
 396                 .extra2 = &max_state_count
 397         },
 398         {
 399                 .ctl_name = NET_DECNET_DR_COUNT,
 400                 .procname = "dr_count",
 401                 .data = &decnet_dr_count,
 402                 .maxlen = sizeof(int),
 403                 .mode = 0644,
 404                 .proc_handler = &proc_dointvec_minmax,
 405                 .strategy = &sysctl_intvec,
 406                 .extra1 = &min_state_count,
 407                 .extra2 = &max_state_count
 408         },
 409         {
 410                 .ctl_name = NET_DECNET_DST_GC_INTERVAL,
 411                 .procname = "dst_gc_interval",
 412                 .data = &decnet_dst_gc_interval,
 413                 .maxlen = sizeof(int),
 414                 .mode = 0644,
 415                 .proc_handler = &proc_dointvec_minmax,
 416                 .strategy = &sysctl_intvec,
 417                 .extra1 = &min_decnet_dst_gc_interval,
 418                 .extra2 = &max_decnet_dst_gc_interval
 419         },
 420         {
 421                 .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
 422                 .procname = "no_fc_max_cwnd",
 423                 .data = &decnet_no_fc_max_cwnd,
 424                 .maxlen = sizeof(int),
 425                 .mode = 0644,
 426                 .proc_handler = &proc_dointvec_minmax,
 427                 .strategy = &sysctl_intvec,
 428                 .extra1 = &min_decnet_no_fc_max_cwnd,
 429                 .extra2 = &max_decnet_no_fc_max_cwnd
 430         },
 431         {
 432                 .ctl_name = NET_DECNET_DEBUG_LEVEL,
 433                 .procname = "debug",
 434                 .data = &decnet_debug_level,
 435                 .maxlen = sizeof(int),
 436                 .mode = 0644,
 437                 .proc_handler = &proc_dointvec,
 438                 .strategy = &sysctl_intvec,
 439         },
 440         {0}
 441 };
 442
 443 static ctl_table dn_dir_table[] = {
 444         {
 445                 .ctl_name = NET_DECNET,
 446                 .procname = "decnet",
 447                 .mode = 0555,
 448                 .child = dn_table},
 449         {0}
 450 };
 451
 452 static ctl_table dn_root_table[] = {
 453         {
 454                 .ctl_name = CTL_NET,
 455                 .procname = "net",
 456                 .mode = 0555,
 457                 .child = dn_dir_table
 458         },
 459         {0}
 460 };
 461
 462 void dn_register_sysctl(void)
 463 {
 464         dn_table_header = register_sysctl_table(dn_root_table, 1);
 465 }
 466
 467 void dn_unregister_sysctl(void)
 468 {
 469         unregister_sysctl_table(dn_table_header);
 470 }
 471
 472 #else  /* CONFIG_SYSCTL */
 473 void dn_unregister_sysctl(void)
 474 {
 475 }
 476 void dn_register_sysctl(void)
 477 {
 478 }
 479
 480 #endif