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 32int decnet_debug_level; 33int decnet_time_wait = 30; 34int decnet_dn_count = 1; 35int decnet_di_count = 3; 36int decnet_dr_count = 3; 37int decnet_log_martians = 1; 38int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW; 39 40/* Reasonable defaults, I hope, based on tcp's defaults */ 41int sysctl_decnet_mem[3] = { 768 << 3, 1024 << 3, 1536 << 3 }; 42int sysctl_decnet_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 }; 43int sysctl_decnet_rmem[3] = { 4 * 1024, 87380, 87380 * 2 }; 44 45#ifdef CONFIG_SYSCTL 46extern int decnet_dst_gc_interval; 47static int min_decnet_time_wait[] = { 5 }; 48static int max_decnet_time_wait[] = { 600 }; 49static int min_state_count[] = { 1 }; 50static int max_state_count[] = { NSP_MAXRXTSHIFT }; 51static int min_decnet_dst_gc_interval[] = { 1 }; 52static int max_decnet_dst_gc_interval[] = { 60 }; 53static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW }; 54static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW }; 55static char node_name[7] = "???"; 56 57static 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 68static 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 */ 88static 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 134static 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 185static 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 248static 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 353static struct ctl_path dn_path[] = { 354 { .procname = "net", }, 355 { .procname = "decnet", }, 356 { } 357}; 358 359void dn_register_sysctl(void) 360{ 361 dn_table_header = register_sysctl_paths(dn_path, dn_table); 362} 363 364void dn_unregister_sysctl(void) 365{ 366 unregister_sysctl_table(dn_table_header); 367} 368 369#else /* CONFIG_SYSCTL */ 370void dn_unregister_sysctl(void) 371{ 372} 373void dn_register_sysctl(void) 374{ 375} 376 377#endif 378