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 static int dn_node_address_handler(ctl_table *table, int write,
 135                                 void __user *buffer,
 136                                 size_t *lenp, loff_t *ppos)
 137 {
 138         char addr[DN_ASCBUF_LEN];
 139         size_t len;
 140         __le16 dnaddr;
 141
 142         if (!*lenp || (*ppos && !write)) {
 143                 *lenp = 0;
 144                 return 0;
 145         }
 146
 147         if (write) {
 148                 len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
 149
 150                 if (copy_from_user(addr, buffer, len))
 151                         return -EFAULT;
 152
 153                 addr[len] = 0;
 154                 strip_it(addr);
 155
 156                 if (parse_addr(&dnaddr, addr))
 157                         return -EINVAL;
 158
 159                 dn_dev_devices_off();
 160
 161                 decnet_address = dnaddr;
 162
 163                 dn_dev_devices_on();
 164
 165                 *ppos += len;
 166
 167                 return 0;
 168         }
 169
 170         dn_addr2asc(le16_to_cpu(decnet_address), addr);
 171         len = strlen(addr);
 172         addr[len++] = '\n';
 173
 174         if (len > *lenp) len = *lenp;
 175
 176         if (copy_to_user(buffer, addr, len))
 177                 return -EFAULT;
 178
 179         *lenp = len;
 180         *ppos += len;
 181
 182         return 0;
 183 }
 184
 185 static int dn_def_dev_handler(ctl_table *table, int write,
 186                                 void __user *buffer,
 187                                 size_t *lenp, loff_t *ppos)
 188 {
 189         size_t len;
 190         struct net_device *dev;
 191         char devname[17];
 192
 193         if (!*lenp || (*ppos && !write)) {
 194                 *lenp = 0;
 195                 return 0;
 196         }
 197
 198         if (write) {
 199                 if (*lenp > 16)
 200                         return -E2BIG;
 201
 202                 if (copy_from_user(devname, buffer, *lenp))
 203                         return -EFAULT;
 204
 205                 devname[*lenp] = 0;
 206                 strip_it(devname);
 207
 208                 dev = dev_get_by_name(&init_net, devname);
 209                 if (dev == NULL)
 210                         return -ENODEV;
 211
 212                 if (dev->dn_ptr == NULL) {
 213                         dev_put(dev);
 214                         return -ENODEV;
 215                 }
 216
 217                 if (dn_dev_set_default(dev, 1)) {
 218                         dev_put(dev);
 219                         return -ENODEV;
 220                 }
 221                 *ppos += *lenp;
 222
 223                 return 0;
 224         }
 225
 226         dev = dn_dev_get_default();
 227         if (dev == NULL) {
 228                 *lenp = 0;
 229                 return 0;
 230         }
 231
 232         strcpy(devname, dev->name);
 233         dev_put(dev);
 234         len = strlen(devname);
 235         devname[len++] = '\n';
 236
 237         if (len > *lenp) len = *lenp;
 238
 239         if (copy_to_user(buffer, devname, len))
 240                 return -EFAULT;
 241
 242         *lenp = len;
 243         *ppos += len;
 244
 245         return 0;
 246 }
 247
 248 static ctl_table dn_table[] = {
 249         {
 250                 .procname = "node_address",
 251                 .maxlen = 7,
 252                 .mode = 0644,
 253                 .proc_handler = dn_node_address_handler,
 254         },
 255         {
 256                 .procname = "node_name",
 257                 .data = node_name,
 258                 .maxlen = 7,
 259                 .mode = 0644,
 260                 .proc_handler = proc_dostring,
 261         },
 262         {
 263                 .procname = "default_device",
 264                 .maxlen = 16,
 265                 .mode = 0644,
 266                 .proc_handler = dn_def_dev_handler,
 267         },
 268         {
 269                 .procname = "time_wait",
 270                 .data = &decnet_time_wait,
 271                 .maxlen = sizeof(int),
 272                 .mode = 0644,
 273                 .proc_handler = proc_dointvec_minmax,
 274                 .extra1 = &min_decnet_time_wait,
 275                 .extra2 = &max_decnet_time_wait
 276         },
 277         {
 278                 .procname = "dn_count",
 279                 .data = &decnet_dn_count,
 280                 .maxlen = sizeof(int),
 281                 .mode = 0644,
 282                 .proc_handler = proc_dointvec_minmax,
 283                 .extra1 = &min_state_count,
 284                 .extra2 = &max_state_count
 285         },
 286         {
 287                 .procname = "di_count",
 288                 .data = &decnet_di_count,
 289                 .maxlen = sizeof(int),
 290                 .mode = 0644,
 291                 .proc_handler = proc_dointvec_minmax,
 292                 .extra1 = &min_state_count,
 293                 .extra2 = &max_state_count
 294         },
 295         {
 296                 .procname = "dr_count",
 297                 .data = &decnet_dr_count,
 298                 .maxlen = sizeof(int),
 299                 .mode = 0644,
 300                 .proc_handler = proc_dointvec_minmax,
 301                 .extra1 = &min_state_count,
 302                 .extra2 = &max_state_count
 303         },
 304         {
 305                 .procname = "dst_gc_interval",
 306                 .data = &decnet_dst_gc_interval,
 307                 .maxlen = sizeof(int),
 308                 .mode = 0644,
 309                 .proc_handler = proc_dointvec_minmax,
 310                 .extra1 = &min_decnet_dst_gc_interval,
 311                 .extra2 = &max_decnet_dst_gc_interval
 312         },
 313         {
 314                 .procname = "no_fc_max_cwnd",
 315                 .data = &decnet_no_fc_max_cwnd,
 316                 .maxlen = sizeof(int),
 317                 .mode = 0644,
 318                 .proc_handler = proc_dointvec_minmax,
 319                 .extra1 = &min_decnet_no_fc_max_cwnd,
 320                 .extra2 = &max_decnet_no_fc_max_cwnd
 321         },
 322        {
 323                 .procname = "decnet_mem",
 324                 .data = &sysctl_decnet_mem,
 325                 .maxlen = sizeof(sysctl_decnet_mem),
 326                 .mode = 0644,
 327                 .proc_handler = proc_dointvec,
 328         },
 329         {
 330                 .procname = "decnet_rmem",
 331                 .data = &sysctl_decnet_rmem,
 332                 .maxlen = sizeof(sysctl_decnet_rmem),
 333                 .mode = 0644,
 334                 .proc_handler = proc_dointvec,
 335         },
 336         {
 337                 .procname = "decnet_wmem",
 338                 .data = &sysctl_decnet_wmem,
 339                 .maxlen = sizeof(sysctl_decnet_wmem),
 340                 .mode = 0644,
 341                 .proc_handler = proc_dointvec,
 342         },
 343         {
 344                 .procname = "debug",
 345                 .data = &decnet_debug_level,
 346                 .maxlen = sizeof(int),
 347                 .mode = 0644,
 348                 .proc_handler = proc_dointvec,
 349         },
 350         { }
 351 };
 352
 353 static struct ctl_path dn_path[] = {
 354         { .procname = "net", },
 355         { .procname = "decnet", },
 356         { }
 357 };
 358
 359 void dn_register_sysctl(void)
 360 {
 361         dn_table_header = register_sysctl_paths(dn_path, dn_table);
 362 }
 363
 364 void dn_unregister_sysctl(void)
 365 {
 366         unregister_sysctl_table(dn_table_header);
 367 }
 368
 369 #else  /* CONFIG_SYSCTL */
 370 void dn_unregister_sysctl(void)
 371 {
 372 }
 373 void dn_register_sysctl(void)
 374 {
 375 }
 376
 377 #endif