linux/net/decnet/sysctl_net_decnet.c
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   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 */
  41long 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                        /* Fallthrough */
  78                case 0:
  79                        return;
  80                }
  81                str++;
  82        }
  83}
  84
  85/*
  86 * Simple routine to parse an ascii DECnet address
  87 * into a network order address.
  88 */
  89static int parse_addr(__le16 *addr, char *str)
  90{
  91        __u16 area, node;
  92
  93        while(*str && !ISNUM(*str)) str++;
  94
  95        if (*str == 0)
  96                return -1;
  97
  98        area = (*str++ - '0');
  99        if (ISNUM(*str)) {
 100                area *= 10;
 101                area += (*str++ - '0');
 102        }
 103
 104        if (*str++ != '.')
 105                return -1;
 106
 107        if (!ISNUM(*str))
 108                return -1;
 109
 110        node = *str++ - '0';
 111        if (ISNUM(*str)) {
 112                node *= 10;
 113                node += (*str++ - '0');
 114        }
 115        if (ISNUM(*str)) {
 116                node *= 10;
 117                node += (*str++ - '0');
 118        }
 119        if (ISNUM(*str)) {
 120                node *= 10;
 121                node += (*str++ - '0');
 122        }
 123
 124        if ((node > 1023) || (area > 63))
 125                return -1;
 126
 127        if (INVALID_END_CHAR(*str))
 128                return -1;
 129
 130        *addr = cpu_to_le16((area << 10) | node);
 131
 132        return 0;
 133}
 134
 135static int dn_node_address_handler(ctl_table *table, int write,
 136                                void __user *buffer,
 137                                size_t *lenp, loff_t *ppos)
 138{
 139        char addr[DN_ASCBUF_LEN];
 140        size_t len;
 141        __le16 dnaddr;
 142
 143        if (!*lenp || (*ppos && !write)) {
 144                *lenp = 0;
 145                return 0;
 146        }
 147
 148        if (write) {
 149                len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
 150
 151                if (copy_from_user(addr, buffer, len))
 152                        return -EFAULT;
 153
 154                addr[len] = 0;
 155                strip_it(addr);
 156
 157                if (parse_addr(&dnaddr, addr))
 158                        return -EINVAL;
 159
 160                dn_dev_devices_off();
 161
 162                decnet_address = dnaddr;
 163
 164                dn_dev_devices_on();
 165
 166                *ppos += len;
 167
 168                return 0;
 169        }
 170
 171        dn_addr2asc(le16_to_cpu(decnet_address), addr);
 172        len = strlen(addr);
 173        addr[len++] = '\n';
 174
 175        if (len > *lenp) len = *lenp;
 176
 177        if (copy_to_user(buffer, addr, len))
 178                return -EFAULT;
 179
 180        *lenp = len;
 181        *ppos += len;
 182
 183        return 0;
 184}
 185
 186static int dn_def_dev_handler(ctl_table *table, int write,
 187                                void __user *buffer,
 188                                size_t *lenp, loff_t *ppos)
 189{
 190        size_t len;
 191        struct net_device *dev;
 192        char devname[17];
 193
 194        if (!*lenp || (*ppos && !write)) {
 195                *lenp = 0;
 196                return 0;
 197        }
 198
 199        if (write) {
 200                if (*lenp > 16)
 201                        return -E2BIG;
 202
 203                if (copy_from_user(devname, buffer, *lenp))
 204                        return -EFAULT;
 205
 206                devname[*lenp] = 0;
 207                strip_it(devname);
 208
 209                dev = dev_get_by_name(&init_net, devname);
 210                if (dev == NULL)
 211                        return -ENODEV;
 212
 213                if (dev->dn_ptr == NULL) {
 214                        dev_put(dev);
 215                        return -ENODEV;
 216                }
 217
 218                if (dn_dev_set_default(dev, 1)) {
 219                        dev_put(dev);
 220                        return -ENODEV;
 221                }
 222                *ppos += *lenp;
 223
 224                return 0;
 225        }
 226
 227        dev = dn_dev_get_default();
 228        if (dev == NULL) {
 229                *lenp = 0;
 230                return 0;
 231        }
 232
 233        strcpy(devname, dev->name);
 234        dev_put(dev);
 235        len = strlen(devname);
 236        devname[len++] = '\n';
 237
 238        if (len > *lenp) len = *lenp;
 239
 240        if (copy_to_user(buffer, devname, len))
 241                return -EFAULT;
 242
 243        *lenp = len;
 244        *ppos += len;
 245
 246        return 0;
 247}
 248
 249static ctl_table dn_table[] = {
 250        {
 251                .procname = "node_address",
 252                .maxlen = 7,
 253                .mode = 0644,
 254                .proc_handler = dn_node_address_handler,
 255        },
 256        {
 257                .procname = "node_name",
 258                .data = node_name,
 259                .maxlen = 7,
 260                .mode = 0644,
 261                .proc_handler = proc_dostring,
 262        },
 263        {
 264                .procname = "default_device",
 265                .maxlen = 16,
 266                .mode = 0644,
 267                .proc_handler = dn_def_dev_handler,
 268        },
 269        {
 270                .procname = "time_wait",
 271                .data = &decnet_time_wait,
 272                .maxlen = sizeof(int),
 273                .mode = 0644,
 274                .proc_handler = proc_dointvec_minmax,
 275                .extra1 = &min_decnet_time_wait,
 276                .extra2 = &max_decnet_time_wait
 277        },
 278        {
 279                .procname = "dn_count",
 280                .data = &decnet_dn_count,
 281                .maxlen = sizeof(int),
 282                .mode = 0644,
 283                .proc_handler = proc_dointvec_minmax,
 284                .extra1 = &min_state_count,
 285                .extra2 = &max_state_count
 286        },
 287        {
 288                .procname = "di_count",
 289                .data = &decnet_di_count,
 290                .maxlen = sizeof(int),
 291                .mode = 0644,
 292                .proc_handler = proc_dointvec_minmax,
 293                .extra1 = &min_state_count,
 294                .extra2 = &max_state_count
 295        },
 296        {
 297                .procname = "dr_count",
 298                .data = &decnet_dr_count,
 299                .maxlen = sizeof(int),
 300                .mode = 0644,
 301                .proc_handler = proc_dointvec_minmax,
 302                .extra1 = &min_state_count,
 303                .extra2 = &max_state_count
 304        },
 305        {
 306                .procname = "dst_gc_interval",
 307                .data = &decnet_dst_gc_interval,
 308                .maxlen = sizeof(int),
 309                .mode = 0644,
 310                .proc_handler = proc_dointvec_minmax,
 311                .extra1 = &min_decnet_dst_gc_interval,
 312                .extra2 = &max_decnet_dst_gc_interval
 313        },
 314        {
 315                .procname = "no_fc_max_cwnd",
 316                .data = &decnet_no_fc_max_cwnd,
 317                .maxlen = sizeof(int),
 318                .mode = 0644,
 319                .proc_handler = proc_dointvec_minmax,
 320                .extra1 = &min_decnet_no_fc_max_cwnd,
 321                .extra2 = &max_decnet_no_fc_max_cwnd
 322        },
 323       {
 324                .procname = "decnet_mem",
 325                .data = &sysctl_decnet_mem,
 326                .maxlen = sizeof(sysctl_decnet_mem),
 327                .mode = 0644,
 328                .proc_handler = proc_doulongvec_minmax
 329        },
 330        {
 331                .procname = "decnet_rmem",
 332                .data = &sysctl_decnet_rmem,
 333                .maxlen = sizeof(sysctl_decnet_rmem),
 334                .mode = 0644,
 335                .proc_handler = proc_dointvec,
 336        },
 337        {
 338                .procname = "decnet_wmem",
 339                .data = &sysctl_decnet_wmem,
 340                .maxlen = sizeof(sysctl_decnet_wmem),
 341                .mode = 0644,
 342                .proc_handler = proc_dointvec,
 343        },
 344        {
 345                .procname = "debug",
 346                .data = &decnet_debug_level,
 347                .maxlen = sizeof(int),
 348                .mode = 0644,
 349                .proc_handler = proc_dointvec,
 350        },
 351        { }
 352};
 353
 354void dn_register_sysctl(void)
 355{
 356        dn_table_header = register_net_sysctl(&init_net, "net/decnet", dn_table);
 357}
 358
 359void dn_unregister_sysctl(void)
 360{
 361        unregister_net_sysctl_table(dn_table_header);
 362}
 363
 364#else  /* CONFIG_SYSCTL */
 365void dn_unregister_sysctl(void)
 366{
 367}
 368void dn_register_sysctl(void)
 369{
 370}
 371
 372#endif
 373
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