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