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  * Steve Whitehouse - Memory buffer settings, like the tcp ones
  14  *
  15  */
  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 /* Reasonable defaults, I hope, based on tcp's defaults */
  41 int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 };
  42 int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 };
  43 int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 };
  44
  45 #ifdef CONFIG_SYSCTL
  46 extern int decnet_dst_gc_interval;
  47 static int min_decnet_time_wait[] = { 5 };
  48 static int max_decnet_time_wait[] = { 600 };
  49 static int min_state_count[] = { 1 };
  50 static int max_state_count[] = { NSP_MAXRXTSHIFT };
  51 static int min_decnet_dst_gc_interval[] = { 1 };
  52 static int max_decnet_dst_gc_interval[] = { 60 };
  53 static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
  54 static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
  55 static char node_name[7] = "???";
  56
  57 static struct ctl_table_header *dn_table_header = NULL;
  58
  59 /*
  60  * ctype.h :-)
  61  */
  62 #define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
  63 #define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
  64 #define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
  65 #define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
  66 #define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
  67
  68 static void strip_it(char *str)
  69 {
  70         for(;;) {
  71                 switch(*str) {
  72                         case ' ':
  73                         case '\n':
  74                         case '\r':
  75                         case ':':
  76                                 *str = 0;
  77                         case 0:
  78                                 return;
  79                 }
  80                 str++;
  81         }
  82 }
  83
  84 /*
  85  * Simple routine to parse an ascii DECnet address
  86  * into a network order address.
  87  */
  88 static int parse_addr(__le16 *addr, char *str)
  89 {
  90         __u16 area, node;
  91
  92         while(*str && !ISNUM(*str)) str++;
  93
  94         if (*str == 0)
  95                 return -1;
  96
  97         area = (*str++ - '0');
  98         if (ISNUM(*str)) {
  99                 area *= 10;
 100                 area += (*str++ - '0');
 101         }
 102
 103         if (*str++ != '.')
 104                 return -1;
 105
 106         if (!ISNUM(*str))
 107                 return -1;
 108
 109         node = *str++ - '0';
 110         if (ISNUM(*str)) {
 111                 node *= 10;
 112                 node += (*str++ - '0');
 113         }
 114         if (ISNUM(*str)) {
 115                 node *= 10;
 116                 node += (*str++ - '0');
 117         }
 118         if (ISNUM(*str)) {
 119                 node *= 10;
 120                 node += (*str++ - '0');
 121         }
 122
 123         if ((node > 1023) || (area > 63))
 124                 return -1;
 125
 126         if (INVALID_END_CHAR(*str))
 127                 return -1;
 128
 129         *addr = cpu_to_le16((area << 10) | node);
 130
 131         return 0;
 132 }
 133
 134
 135 static int dn_node_address_strategy(ctl_table *table,
 136                                 void __user *oldval, size_t __user *oldlenp,
 137                                 void __user *newval, size_t newlen)
 138 {
 139         size_t len;
 140         __le16 addr;
 141
 142         if (oldval && oldlenp) {
 143                 if (get_user(len, oldlenp))
 144                         return -EFAULT;
 145                 if (len) {
 146                         if (len != sizeof(unsigned short))
 147                                 return -EINVAL;
 148                         if (put_user(decnet_address, (__le16 __user *)oldval))
 149                                 return -EFAULT;
 150                 }
 151         }
 152         if (newval && newlen) {
 153                 if (newlen != sizeof(unsigned short))
 154                         return -EINVAL;
 155                 if (get_user(addr, (__le16 __user *)newval))
 156                         return -EFAULT;
 157
 158                 dn_dev_devices_off();
 159
 160                 decnet_address = addr;
 161
 162                 dn_dev_devices_on();
 163         }
 164         return 0;
 165 }
 166
 167 static int dn_node_address_handler(ctl_table *table, int write,
 168                                 void __user *buffer,
 169                                 size_t *lenp, loff_t *ppos)
 170 {
 171         char addr[DN_ASCBUF_LEN];
 172         size_t len;
 173         __le16 dnaddr;
 174
 175         if (!*lenp || (*ppos && !write)) {
 176                 *lenp = 0;
 177                 return 0;
 178         }
 179
 180         if (write) {
 181                 len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
 182
 183                 if (copy_from_user(addr, buffer, len))
 184                         return -EFAULT;
 185
 186                 addr[len] = 0;
 187                 strip_it(addr);
 188
 189                 if (parse_addr(&dnaddr, addr))
 190                         return -EINVAL;
 191
 192                 dn_dev_devices_off();
 193
 194                 decnet_address = dnaddr;
 195
 196                 dn_dev_devices_on();
 197
 198                 *ppos += len;
 199
 200                 return 0;
 201         }
 202
 203         dn_addr2asc(le16_to_cpu(decnet_address), addr);
 204         len = strlen(addr);
 205         addr[len++] = '\n';
 206
 207         if (len > *lenp) len = *lenp;
 208
 209         if (copy_to_user(buffer, addr, len))
 210                 return -EFAULT;
 211
 212         *lenp = len;
 213         *ppos += len;
 214
 215         return 0;
 216 }
 217
 218
 219 static int dn_def_dev_strategy(ctl_table *table,
 220                                 void __user *oldval, size_t __user *oldlenp,
 221                                 void __user *newval, size_t newlen)
 222 {
 223         size_t len;
 224         struct net_device *dev;
 225         char devname[17];
 226         size_t namel;
 227         int rv = 0;
 228
 229         devname[0] = 0;
 230
 231         if (oldval && oldlenp) {
 232                 if (get_user(len, oldlenp))
 233                         return -EFAULT;
 234                 if (len) {
 235                         dev = dn_dev_get_default();
 236                         if (dev) {
 237                                 strcpy(devname, dev->name);
 238                                 dev_put(dev);
 239                         }
 240
 241                         namel = strlen(devname) + 1;
 242                         if (len > namel) len = namel;
 243
 244                         if (copy_to_user(oldval, devname, len))
 245                                 return -EFAULT;
 246
 247                         if (put_user(len, oldlenp))
 248                                 return -EFAULT;
 249                 }
 250         }
 251
 252         if (newval && newlen) {
 253                 if (newlen > 16)
 254                         return -E2BIG;
 255
 256                 if (copy_from_user(devname, newval, newlen))
 257                         return -EFAULT;
 258
 259                 devname[newlen] = 0;
 260
 261                 dev = dev_get_by_name(&init_net, devname);
 262                 if (dev == NULL)
 263                         return -ENODEV;
 264
 265                 rv = -ENODEV;
 266                 if (dev->dn_ptr != NULL) {
 267                         rv = dn_dev_set_default(dev, 1);
 268                         if (rv)
 269                                 dev_put(dev);
 270                 }
 271         }
 272
 273         return rv;
 274 }
 275
 276
 277 static int dn_def_dev_handler(ctl_table *table, int write,
 278                                 void __user *buffer,
 279                                 size_t *lenp, loff_t *ppos)
 280 {
 281         size_t len;
 282         struct net_device *dev;
 283         char devname[17];
 284
 285         if (!*lenp || (*ppos && !write)) {
 286                 *lenp = 0;
 287                 return 0;
 288         }
 289
 290         if (write) {
 291                 if (*lenp > 16)
 292                         return -E2BIG;
 293
 294                 if (copy_from_user(devname, buffer, *lenp))
 295                         return -EFAULT;
 296
 297                 devname[*lenp] = 0;
 298                 strip_it(devname);
 299
 300                 dev = dev_get_by_name(&init_net, devname);
 301                 if (dev == NULL)
 302                         return -ENODEV;
 303
 304                 if (dev->dn_ptr == NULL) {
 305                         dev_put(dev);
 306                         return -ENODEV;
 307                 }
 308
 309                 if (dn_dev_set_default(dev, 1)) {
 310                         dev_put(dev);
 311                         return -ENODEV;
 312                 }
 313                 *ppos += *lenp;
 314
 315                 return 0;
 316         }
 317
 318         dev = dn_dev_get_default();
 319         if (dev == NULL) {
 320                 *lenp = 0;
 321                 return 0;
 322         }
 323
 324         strcpy(devname, dev->name);
 325         dev_put(dev);
 326         len = strlen(devname);
 327         devname[len++] = '\n';
 328
 329         if (len > *lenp) len = *lenp;
 330
 331         if (copy_to_user(buffer, devname, len))
 332                 return -EFAULT;
 333
 334         *lenp = len;
 335         *ppos += len;
 336
 337         return 0;
 338 }
 339
 340 static ctl_table dn_table[] = {
 341         {
 342                 .ctl_name = NET_DECNET_NODE_ADDRESS,
 343                 .procname = "node_address",
 344                 .maxlen = 7,
 345                 .mode = 0644,
 346                 .proc_handler = dn_node_address_handler,
 347                 .strategy = dn_node_address_strategy,
 348         },
 349         {
 350                 .ctl_name = NET_DECNET_NODE_NAME,
 351                 .procname = "node_name",
 352                 .data = node_name,
 353                 .maxlen = 7,
 354                 .mode = 0644,
 355                 .proc_handler = proc_dostring,
 356                 .strategy = sysctl_string,
 357         },
 358         {
 359                 .ctl_name = NET_DECNET_DEFAULT_DEVICE,
 360                 .procname = "default_device",
 361                 .maxlen = 16,
 362                 .mode = 0644,
 363                 .proc_handler = dn_def_dev_handler,
 364                 .strategy = dn_def_dev_strategy,
 365         },
 366         {
 367                 .ctl_name = NET_DECNET_TIME_WAIT,
 368                 .procname = "time_wait",
 369                 .data = &decnet_time_wait,
 370                 .maxlen = sizeof(int),
 371                 .mode = 0644,
 372                 .proc_handler = proc_dointvec_minmax,
 373                 .strategy = sysctl_intvec,
 374                 .extra1 = &min_decnet_time_wait,
 375                 .extra2 = &max_decnet_time_wait
 376         },
 377         {
 378                 .ctl_name = NET_DECNET_DN_COUNT,
 379                 .procname = "dn_count",
 380                 .data = &decnet_dn_count,
 381                 .maxlen = sizeof(int),
 382                 .mode = 0644,
 383                 .proc_handler = proc_dointvec_minmax,
 384                 .strategy = sysctl_intvec,
 385                 .extra1 = &min_state_count,
 386                 .extra2 = &max_state_count
 387         },
 388         {
 389                 .ctl_name = NET_DECNET_DI_COUNT,
 390                 .procname = "di_count",
 391                 .data = &decnet_di_count,
 392                 .maxlen = sizeof(int),
 393                 .mode = 0644,
 394                 .proc_handler = proc_dointvec_minmax,
 395                 .strategy = sysctl_intvec,
 396                 .extra1 = &min_state_count,
 397                 .extra2 = &max_state_count
 398         },
 399         {
 400                 .ctl_name = NET_DECNET_DR_COUNT,
 401                 .procname = "dr_count",
 402                 .data = &decnet_dr_count,
 403                 .maxlen = sizeof(int),
 404                 .mode = 0644,
 405                 .proc_handler = proc_dointvec_minmax,
 406                 .strategy = sysctl_intvec,
 407                 .extra1 = &min_state_count,
 408                 .extra2 = &max_state_count
 409         },
 410         {
 411                 .ctl_name = NET_DECNET_DST_GC_INTERVAL,
 412                 .procname = "dst_gc_interval",
 413                 .data = &decnet_dst_gc_interval,
 414                 .maxlen = sizeof(int),
 415                 .mode = 0644,
 416                 .proc_handler = proc_dointvec_minmax,
 417                 .strategy = sysctl_intvec,
 418                 .extra1 = &min_decnet_dst_gc_interval,
 419                 .extra2 = &max_decnet_dst_gc_interval
 420         },
 421         {
 422                 .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
 423                 .procname = "no_fc_max_cwnd",
 424                 .data = &decnet_no_fc_max_cwnd,
 425                 .maxlen = sizeof(int),
 426                 .mode = 0644,
 427                 .proc_handler = proc_dointvec_minmax,
 428                 .strategy = sysctl_intvec,
 429                 .extra1 = &min_decnet_no_fc_max_cwnd,
 430                 .extra2 = &max_decnet_no_fc_max_cwnd
 431         },
 432        {
 433                 .ctl_name = NET_DECNET_MEM,
 434                 .procname = "decnet_mem",
 435                 .data = &sysctl_decnet_mem,
 436                 .maxlen = sizeof(sysctl_decnet_mem),
 437                 .mode = 0644,
 438                 .proc_handler = proc_dointvec,
 439                 .strategy = sysctl_intvec,
 440         },
 441         {
 442                 .ctl_name = NET_DECNET_RMEM,
 443                 .procname = "decnet_rmem",
 444                 .data = &sysctl_decnet_rmem,
 445                 .maxlen = sizeof(sysctl_decnet_rmem),
 446                 .mode = 0644,
 447                 .proc_handler = proc_dointvec,
 448                 .strategy = sysctl_intvec,
 449         },
 450         {
 451                 .ctl_name = NET_DECNET_WMEM,
 452                 .procname = "decnet_wmem",
 453                 .data = &sysctl_decnet_wmem,
 454                 .maxlen = sizeof(sysctl_decnet_wmem),
 455                 .mode = 0644,
 456                 .proc_handler = proc_dointvec,
 457                 .strategy = sysctl_intvec,
 458         },
 459         {
 460                 .ctl_name = NET_DECNET_DEBUG_LEVEL,
 461                 .procname = "debug",
 462                 .data = &decnet_debug_level,
 463                 .maxlen = sizeof(int),
 464                 .mode = 0644,
 465                 .proc_handler = proc_dointvec,
 466                 .strategy = sysctl_intvec,
 467         },
 468         {0}
 469 };
 470
 471 static struct ctl_path dn_path[] = {
 472         { .procname = "net", .ctl_name = CTL_NET, },
 473         { .procname = "decnet", .ctl_name = NET_DECNET, },
 474         { }
 475 };
 476
 477 void dn_register_sysctl(void)
 478 {
 479         dn_table_header = register_sysctl_paths(dn_path, dn_table);
 480 }
 481
 482 void dn_unregister_sysctl(void)
 483 {
 484         unregister_sysctl_table(dn_table_header);
 485 }
 486
 487 #else  /* CONFIG_SYSCTL */
 488 void dn_unregister_sysctl(void)
 489 {
 490 }
 491 void dn_register_sysctl(void)
 492 {
 493 }
 494
 495 #endif