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 = dn_htons((area << 10) | node);
 130
 131         return 0;
 132 }
 133
 134
 135 static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
 136                                 void __user *oldval, size_t __user *oldlenp,
 137                                 void __user *newval, size_t newlen,
 138                                 void **context)
 139 {
 140         size_t len;
 141         __le16 addr;
 142
 143         if (oldval && oldlenp) {
 144                 if (get_user(len, oldlenp))
 145                         return -EFAULT;
 146                 if (len) {
 147                         if (len != sizeof(unsigned short))
 148                                 return -EINVAL;
 149                         if (put_user(decnet_address, (__le16 __user *)oldval))
 150                                 return -EFAULT;
 151                 }
 152         }
 153         if (newval && newlen) {
 154                 if (newlen != sizeof(unsigned short))
 155                         return -EINVAL;
 156                 if (get_user(addr, (__le16 __user *)newval))
 157                         return -EFAULT;
 158
 159                 dn_dev_devices_off();
 160
 161                 decnet_address = addr;
 162
 163                 dn_dev_devices_on();
 164         }
 165         return 0;
 166 }
 167
 168 static int dn_node_address_handler(ctl_table *table, int write,
 169                                 struct file *filp,
 170                                 void __user *buffer,
 171                                 size_t *lenp, loff_t *ppos)
 172 {
 173         char addr[DN_ASCBUF_LEN];
 174         size_t len;
 175         __le16 dnaddr;
 176
 177         if (!*lenp || (*ppos && !write)) {
 178                 *lenp = 0;
 179                 return 0;
 180         }
 181
 182         if (write) {
 183                 int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
 184
 185                 if (copy_from_user(addr, buffer, len))
 186                         return -EFAULT;
 187
 188                 addr[len] = 0;
 189                 strip_it(addr);
 190
 191                 if (parse_addr(&dnaddr, addr))
 192                         return -EINVAL;
 193
 194                 dn_dev_devices_off();
 195
 196                 decnet_address = dnaddr;
 197
 198                 dn_dev_devices_on();
 199
 200                 *ppos += len;
 201
 202                 return 0;
 203         }
 204
 205         dn_addr2asc(dn_ntohs(decnet_address), addr);
 206         len = strlen(addr);
 207         addr[len++] = '\n';
 208
 209         if (len > *lenp) len = *lenp;
 210
 211         if (copy_to_user(buffer, addr, len))
 212                 return -EFAULT;
 213
 214         *lenp = len;
 215         *ppos += len;
 216
 217         return 0;
 218 }
 219
 220
 221 static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
 222                                 void __user *oldval, size_t __user *oldlenp,
 223                                 void __user *newval, size_t newlen,
 224                                 void **context)
 225 {
 226         size_t len;
 227         struct net_device *dev;
 228         char devname[17];
 229         size_t namel;
 230         int rv = 0;
 231
 232         devname[0] = 0;
 233
 234         if (oldval && oldlenp) {
 235                 if (get_user(len, oldlenp))
 236                         return -EFAULT;
 237                 if (len) {
 238                         dev = dn_dev_get_default();
 239                         if (dev) {
 240                                 strcpy(devname, dev->name);
 241                                 dev_put(dev);
 242                         }
 243
 244                         namel = strlen(devname) + 1;
 245                         if (len > namel) len = namel;
 246
 247                         if (copy_to_user(oldval, devname, len))
 248                                 return -EFAULT;
 249
 250                         if (put_user(len, oldlenp))
 251                                 return -EFAULT;
 252                 }
 253         }
 254
 255         if (newval && newlen) {
 256                 if (newlen > 16)
 257                         return -E2BIG;
 258
 259                 if (copy_from_user(devname, newval, newlen))
 260                         return -EFAULT;
 261
 262                 devname[newlen] = 0;
 263
 264                 dev = dev_get_by_name(devname);
 265                 if (dev == NULL)
 266                         return -ENODEV;
 267
 268                 rv = -ENODEV;
 269                 if (dev->dn_ptr != NULL) {
 270                         rv = dn_dev_set_default(dev, 1);
 271                         if (rv)
 272                                 dev_put(dev);
 273                 }
 274         }
 275
 276         return rv;
 277 }
 278
 279
 280 static int dn_def_dev_handler(ctl_table *table, int write,
 281                                 struct file * filp,
 282                                 void __user *buffer,
 283                                 size_t *lenp, loff_t *ppos)
 284 {
 285         size_t len;
 286         struct net_device *dev;
 287         char devname[17];
 288
 289         if (!*lenp || (*ppos && !write)) {
 290                 *lenp = 0;
 291                 return 0;
 292         }
 293
 294         if (write) {
 295                 if (*lenp > 16)
 296                         return -E2BIG;
 297
 298                 if (copy_from_user(devname, buffer, *lenp))
 299                         return -EFAULT;
 300
 301                 devname[*lenp] = 0;
 302                 strip_it(devname);
 303
 304                 dev = dev_get_by_name(devname);
 305                 if (dev == NULL)
 306                         return -ENODEV;
 307
 308                 if (dev->dn_ptr == NULL) {
 309                         dev_put(dev);
 310                         return -ENODEV;
 311                 }
 312
 313                 if (dn_dev_set_default(dev, 1)) {
 314                         dev_put(dev);
 315                         return -ENODEV;
 316                 }
 317                 *ppos += *lenp;
 318
 319                 return 0;
 320         }
 321
 322         dev = dn_dev_get_default();
 323         if (dev == NULL) {
 324                 *lenp = 0;
 325                 return 0;
 326         }
 327
 328         strcpy(devname, dev->name);
 329         dev_put(dev);
 330         len = strlen(devname);
 331         devname[len++] = '\n';
 332
 333         if (len > *lenp) len = *lenp;
 334
 335         if (copy_to_user(buffer, devname, len))
 336                 return -EFAULT;
 337
 338         *lenp = len;
 339         *ppos += len;
 340
 341         return 0;
 342 }
 343
 344 static ctl_table dn_table[] = {
 345         {
 346                 .ctl_name = NET_DECNET_NODE_ADDRESS,
 347                 .procname = "node_address",
 348                 .maxlen = 7,
 349                 .mode = 0644,
 350                 .proc_handler = dn_node_address_handler,
 351                 .strategy = dn_node_address_strategy,
 352         },
 353         {
 354                 .ctl_name = NET_DECNET_NODE_NAME,
 355                 .procname = "node_name",
 356                 .data = node_name,
 357                 .maxlen = 7,
 358                 .mode = 0644,
 359                 .proc_handler = &proc_dostring,
 360                 .strategy = &sysctl_string,
 361         },
 362         {
 363                 .ctl_name = NET_DECNET_DEFAULT_DEVICE,
 364                 .procname = "default_device",
 365                 .maxlen = 16,
 366                 .mode = 0644,
 367                 .proc_handler = dn_def_dev_handler,
 368                 .strategy = dn_def_dev_strategy,
 369         },
 370         {
 371                 .ctl_name = NET_DECNET_TIME_WAIT,
 372                 .procname = "time_wait",
 373                 .data = &decnet_time_wait,
 374                 .maxlen = sizeof(int),
 375                 .mode = 0644,
 376                 .proc_handler = &proc_dointvec_minmax,
 377                 .strategy = &sysctl_intvec,
 378                 .extra1 = &min_decnet_time_wait,
 379                 .extra2 = &max_decnet_time_wait
 380         },
 381         {
 382                 .ctl_name = NET_DECNET_DN_COUNT,
 383                 .procname = "dn_count",
 384                 .data = &decnet_dn_count,
 385                 .maxlen = sizeof(int),
 386                 .mode = 0644,
 387                 .proc_handler = &proc_dointvec_minmax,
 388                 .strategy = &sysctl_intvec,
 389                 .extra1 = &min_state_count,
 390                 .extra2 = &max_state_count
 391         },
 392         {
 393                 .ctl_name = NET_DECNET_DI_COUNT,
 394                 .procname = "di_count",
 395                 .data = &decnet_di_count,
 396                 .maxlen = sizeof(int),
 397                 .mode = 0644,
 398                 .proc_handler = &proc_dointvec_minmax,
 399                 .strategy = &sysctl_intvec,
 400                 .extra1 = &min_state_count,
 401                 .extra2 = &max_state_count
 402         },
 403         {
 404                 .ctl_name = NET_DECNET_DR_COUNT,
 405                 .procname = "dr_count",
 406                 .data = &decnet_dr_count,
 407                 .maxlen = sizeof(int),
 408                 .mode = 0644,
 409                 .proc_handler = &proc_dointvec_minmax,
 410                 .strategy = &sysctl_intvec,
 411                 .extra1 = &min_state_count,
 412                 .extra2 = &max_state_count
 413         },
 414         {
 415                 .ctl_name = NET_DECNET_DST_GC_INTERVAL,
 416                 .procname = "dst_gc_interval",
 417                 .data = &decnet_dst_gc_interval,
 418                 .maxlen = sizeof(int),
 419                 .mode = 0644,
 420                 .proc_handler = &proc_dointvec_minmax,
 421                 .strategy = &sysctl_intvec,
 422                 .extra1 = &min_decnet_dst_gc_interval,
 423                 .extra2 = &max_decnet_dst_gc_interval
 424         },
 425         {
 426                 .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
 427                 .procname = "no_fc_max_cwnd",
 428                 .data = &decnet_no_fc_max_cwnd,
 429                 .maxlen = sizeof(int),
 430                 .mode = 0644,
 431                 .proc_handler = &proc_dointvec_minmax,
 432                 .strategy = &sysctl_intvec,
 433                 .extra1 = &min_decnet_no_fc_max_cwnd,
 434                 .extra2 = &max_decnet_no_fc_max_cwnd
 435         },
 436        {
 437                 .ctl_name = NET_DECNET_MEM,
 438                 .procname = "decnet_mem",
 439                 .data = &sysctl_decnet_mem,
 440                 .maxlen = sizeof(sysctl_decnet_mem),
 441                 .mode = 0644,
 442                 .proc_handler = &proc_dointvec,
 443                 .strategy = &sysctl_intvec,
 444         },
 445         {
 446                 .ctl_name = NET_DECNET_RMEM,
 447                 .procname = "decnet_rmem",
 448                 .data = &sysctl_decnet_rmem,
 449                 .maxlen = sizeof(sysctl_decnet_rmem),
 450                 .mode = 0644,
 451                 .proc_handler = &proc_dointvec,
 452                 .strategy = &sysctl_intvec,
 453         },
 454         {
 455                 .ctl_name = NET_DECNET_WMEM,
 456                 .procname = "decnet_wmem",
 457                 .data = &sysctl_decnet_wmem,
 458                 .maxlen = sizeof(sysctl_decnet_wmem),
 459                 .mode = 0644,
 460                 .proc_handler = &proc_dointvec,
 461                 .strategy = &sysctl_intvec,
 462         },
 463         {
 464                 .ctl_name = NET_DECNET_DEBUG_LEVEL,
 465                 .procname = "debug",
 466                 .data = &decnet_debug_level,
 467                 .maxlen = sizeof(int),
 468                 .mode = 0644,
 469                 .proc_handler = &proc_dointvec,
 470                 .strategy = &sysctl_intvec,
 471         },
 472         {0}
 473 };
 474
 475 static ctl_table dn_dir_table[] = {
 476         {
 477                 .ctl_name = NET_DECNET,
 478                 .procname = "decnet",
 479                 .mode = 0555,
 480                 .child = dn_table},
 481         {0}
 482 };
 483
 484 static ctl_table dn_root_table[] = {
 485         {
 486                 .ctl_name = CTL_NET,
 487                 .procname = "net",
 488                 .mode = 0555,
 489                 .child = dn_dir_table
 490         },
 491         {0}
 492 };
 493
 494 void dn_register_sysctl(void)
 495 {
 496         dn_table_header = register_sysctl_table(dn_root_table, 1);
 497 }
 498
 499 void dn_unregister_sysctl(void)
 500 {
 501         unregister_sysctl_table(dn_table_header);
 502 }
 503
 504 #else  /* CONFIG_SYSCTL */
 505 void dn_unregister_sysctl(void)
 506 {
 507 }
 508 void dn_register_sysctl(void)
 509 {
 510 }
 511
 512 #endif