mesh.c

   1 #include <errno.h>
   2 #include <string.h>
   3
   4 #include <netlink/genl/genl.h>
   5 #include <netlink/genl/family.h>
   6 #include <netlink/genl/ctrl.h>
   7 #include <netlink/msg.h>
   8 #include <netlink/attr.h>
   9
  10 #include "nl80211.h"
  11 #include "iw.h"
  12
  13 SECTION(mesh);
  14
  15
  16 typedef struct _any_t {
  17         union {
  18                 uint32_t as_32;
  19                 int32_t as_s32;
  20                 uint16_t as_16;
  21                 uint8_t as_8;
  22         } u;
  23 } _any;
  24
  25 /* describes a mesh parameter */
  26 struct mesh_param_descr {
  27         const char *name;
  28         enum nl80211_meshconf_params mesh_param_num;
  29         int (*nla_put_fn)(struct nl_msg*, int, _any*);
  30         uint32_t (*parse_fn)(const char*, _any*);
  31         void (*nla_print_fn)(struct nlattr *);
  32 };
  33
  34 /* utility functions for manipulating and printing u8/u16/u32 values and
  35  * timesouts. */
  36 static int _my_nla_put_u8(struct nl_msg *n, int mesh_param_num, _any *value)
  37 {
  38         return nla_put(n, mesh_param_num, sizeof(uint8_t), &value->u.as_8);
  39 }
  40
  41 static int _my_nla_put_u16(struct nl_msg *n, int mesh_param_num, _any *value)
  42 {
  43         return nla_put(n, mesh_param_num, sizeof(uint16_t), &value->u.as_16);
  44 }
  45
  46 static int _my_nla_put_u32(struct nl_msg *n, int mesh_param_num, _any *value)
  47 {
  48         return nla_put(n, mesh_param_num, sizeof(uint32_t), &value->u.as_32);
  49 }
  50
  51 static uint32_t _parse_u8(const char *str, _any *ret)
  52 {
  53         char *endptr = NULL;
  54         unsigned long int v = strtoul(str, &endptr, 10);
  55         if (*endptr != '\0')
  56                 return 0xff;
  57         if (v > 0xff)
  58                 return 0xff;
  59         ret->u.as_8 = (uint8_t)v;
  60         return 0;
  61 }
  62
  63 static uint32_t _parse_u8_as_bool(const char *str, _any *ret)
  64 {
  65         char *endptr = NULL;
  66         unsigned long int v = strtoul(str, &endptr, 10);
  67         if (*endptr != '\0')
  68                 return 0x1;
  69         if (v > 0x1)
  70                 return 0x1;
  71         ret->u.as_8 = (uint8_t)v;
  72         return 0;
  73 }
  74
  75 static uint32_t _parse_u16(const char *str, _any *ret)
  76 {
  77         char *endptr = NULL;
  78         long int v = strtol(str, &endptr, 10);
  79         if (*endptr != '\0')
  80                 return 0xffff;
  81         if ((v < 0) || (v > 0xffff))
  82                 return 0xffff;
  83         ret->u.as_16 = (uint16_t)v;
  84         return 0;
  85 }
  86
  87 static uint32_t _parse_u32(const char *str, _any *ret)
  88 {
  89         char *endptr = NULL;
  90         long long int v = strtoll(str, &endptr, 10);
  91         if (*endptr != '\0')
  92                 return 0xffffffff;
  93         if ((v < 0) || (v > 0xffffffff))
  94                 return 0xffffffff;
  95         ret->u.as_32 = (uint32_t)v;
  96         return 0;
  97 }
  98
  99 static uint32_t _parse_s32(const char *str, _any *ret)
 100 {
 101         char *endptr = NULL;
 102         long int v = strtol(str, &endptr, 10);
 103         if (*endptr != '\0')
 104                 return 0xffffffff;
 105         if (v > 0xff)
 106                 return 0xffffffff;
 107         ret->u.as_s32 = (int32_t)v;
 108         return 0;
 109 }
 110
 111 static uint32_t _parse_u32_power_mode(const char *str, _any *ret)
 112 {
 113         unsigned long int v;
 114
 115         /* Parse attribute for the name of power mode */
 116         if (!strcmp(str, "active"))
 117                 v = NL80211_MESH_POWER_ACTIVE;
 118         else if (!strcmp(str, "light"))
 119                 v = NL80211_MESH_POWER_LIGHT_SLEEP;
 120         else if (!strcmp(str, "deep"))
 121                 v = NL80211_MESH_POWER_DEEP_SLEEP;
 122         else
 123                 return 0xff;
 124
 125         ret->u.as_32 = (uint32_t)v;
 126         return 0;
 127 }
 128
 129 static void _print_u8(struct nlattr *a)
 130 {
 131         printf("%d", nla_get_u8(a));
 132 }
 133
 134 static void _print_u16(struct nlattr *a)
 135 {
 136         printf("%d", nla_get_u16(a));
 137 }
 138
 139 static void _print_u16_timeout(struct nlattr *a)
 140 {
 141         printf("%d milliseconds", nla_get_u16(a));
 142 }
 143
 144 static void _print_u16_in_TUs(struct nlattr *a)
 145 {
 146         printf("%d TUs", nla_get_u16(a));
 147 }
 148
 149 static void _print_u32(struct nlattr *a)
 150 {
 151         printf("%d", nla_get_u32(a));
 152 }
 153
 154 static void _print_u32_timeout(struct nlattr *a)
 155 {
 156         printf("%u milliseconds", nla_get_u32(a));
 157 }
 158
 159 static void _print_u32_in_seconds(struct nlattr *a)
 160 {
 161         printf("%d seconds", nla_get_u32(a));
 162 }
 163
 164 static void _print_u32_in_TUs(struct nlattr *a)
 165 {
 166         printf("%d TUs", nla_get_u32(a));
 167 }
 168
 169 static void _print_u32_power_mode(struct nlattr *a)
 170 {
 171         unsigned long v = nla_get_u32(a);
 172
 173         switch (v) {
 174         case NL80211_MESH_POWER_ACTIVE:
 175                 printf("active");
 176                 break;
 177         case NL80211_MESH_POWER_LIGHT_SLEEP:
 178                 printf("light");
 179                 break;
 180         case NL80211_MESH_POWER_DEEP_SLEEP:
 181                 printf("deep");
 182                 break;
 183         default:
 184                 printf("undefined");
 185                 break;
 186         }
 187 }
 188
 189 static void _print_s32_in_dBm(struct nlattr *a)
 190 {
 191         printf("%d dBm", (int32_t) nla_get_u32(a));
 192 }
 193
 194
 195 /* The current mesh parameters */
 196 static const struct mesh_param_descr _mesh_param_descrs[] =
 197 {
 198         {"mesh_retry_timeout",
 199         NL80211_MESHCONF_RETRY_TIMEOUT,
 200         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 201         {"mesh_confirm_timeout",
 202         NL80211_MESHCONF_CONFIRM_TIMEOUT,
 203         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 204         {"mesh_holding_timeout",
 205         NL80211_MESHCONF_HOLDING_TIMEOUT,
 206         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 207         {"mesh_max_peer_links",
 208         NL80211_MESHCONF_MAX_PEER_LINKS,
 209         _my_nla_put_u16, _parse_u16, _print_u16},
 210         {"mesh_max_retries",
 211         NL80211_MESHCONF_MAX_RETRIES,
 212         _my_nla_put_u8, _parse_u8, _print_u8},
 213         {"mesh_ttl",
 214         NL80211_MESHCONF_TTL,
 215         _my_nla_put_u8, _parse_u8, _print_u8},
 216         {"mesh_element_ttl",
 217         NL80211_MESHCONF_ELEMENT_TTL,
 218         _my_nla_put_u8, _parse_u8, _print_u8},
 219         {"mesh_auto_open_plinks",
 220         NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 221         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 222         {"mesh_hwmp_max_preq_retries",
 223         NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
 224         _my_nla_put_u8, _parse_u8, _print_u8},
 225         {"mesh_path_refresh_time",
 226         NL80211_MESHCONF_PATH_REFRESH_TIME,
 227         _my_nla_put_u32, _parse_u32, _print_u32_timeout},
 228         {"mesh_min_discovery_timeout",
 229         NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
 230         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 231         {"mesh_hwmp_active_path_timeout",
 232         NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
 233         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 234         {"mesh_hwmp_preq_min_interval",
 235         NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
 236         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 237         {"mesh_hwmp_net_diameter_traversal_time",
 238         NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
 239         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 240         {"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
 241         _my_nla_put_u8, _parse_u8, _print_u8},
 242         {"mesh_hwmp_rann_interval", NL80211_MESHCONF_HWMP_RANN_INTERVAL,
 243         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 244         {"mesh_gate_announcements", NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
 245         _my_nla_put_u8, _parse_u8, _print_u8},
 246         {"mesh_fwding", NL80211_MESHCONF_FORWARDING,
 247         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 248         {"mesh_sync_offset_max_neighor",
 249         NL80211_MESHCONF_SYNC_OFFSET_MAX_NEIGHBOR,
 250         _my_nla_put_u32, _parse_u32, _print_u32},
 251         {"mesh_rssi_threshold", NL80211_MESHCONF_RSSI_THRESHOLD,
 252         _my_nla_put_u32, _parse_s32, _print_s32_in_dBm},
 253         {"mesh_hwmp_active_path_to_root_timeout",
 254         NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,
 255         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 256         {"mesh_hwmp_root_interval", NL80211_MESHCONF_HWMP_ROOT_INTERVAL,
 257         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 258         {"mesh_hwmp_confirmation_interval",
 259         NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
 260         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 261         {"mesh_power_mode", NL80211_MESHCONF_POWER_MODE,
 262         _my_nla_put_u32, _parse_u32_power_mode, _print_u32_power_mode},
 263         {"mesh_awake_window", NL80211_MESHCONF_AWAKE_WINDOW,
 264         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 265         {"mesh_plink_timeout", NL80211_MESHCONF_PLINK_TIMEOUT,
 266         _my_nla_put_u32, _parse_u32, _print_u32_in_seconds},
 267         {"mesh_nolearn", NL80211_MESHCONF_NOLEARN,
 268         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 269 };
 270
 271 static void print_all_mesh_param_descr(void)
 272 {
 273         unsigned int i;
 274
 275         printf("Possible mesh parameters are:\n");
 276
 277         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
 278                 printf(" - %s\n", _mesh_param_descrs[i].name);
 279 }
 280
 281 static const struct mesh_param_descr *find_mesh_param(const char *name)
 282 {
 283         unsigned int i;
 284
 285         /* Find out what mesh parameter we want to change. */
 286         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 287                 if (strcmp(_mesh_param_descrs[i].name, name) == 0)
 288                         return _mesh_param_descrs + i;
 289         }
 290
 291         return NULL;
 292 }
 293
 294 /* Setter */
 295 static int set_interface_meshparam(struct nl80211_state *state,
 296                                    struct nl_msg *msg,
 297                                    int argc, char **argv,
 298                                    enum id_input id)
 299 {
 300         const struct mesh_param_descr *mdescr;
 301         struct nlattr *container;
 302         uint32_t ret;
 303         int err = 2;
 304
 305         container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
 306         if (!container)
 307                 return -ENOBUFS;
 308
 309         if (!argc) {
 310                 print_all_mesh_param_descr();
 311                 return 1;
 312         }
 313
 314         while (argc) {
 315                 const char *name;
 316                 char *value;
 317                 _any any;
 318
 319                 memset(&any, 0, sizeof(_any));
 320
 321                 name = argv[0];
 322                 value = strchr(name, '=');
 323                 if (value) {
 324                         *value = '\0';
 325                         value++;
 326                         argc--;
 327                         argv++;
 328                 } else {
 329                         /* backward compat -- accept w/o '=' */
 330                         if (argc < 2) {
 331                                 printf("Must specify a value for %s.\n", name);
 332                                 return 2;
 333                         }
 334                         value = argv[1];
 335                         argc -= 2;
 336                         argv += 2;
 337                 }
 338
 339                 mdescr = find_mesh_param(name);
 340                 if (!mdescr) {
 341                         printf("Could not find the parameter %s.\n", name);
 342                         print_all_mesh_param_descr();
 343                         return 2;
 344                 }
 345
 346                 /* Parse the new value */
 347                 ret = mdescr->parse_fn(value, &any);
 348                 if (ret != 0) {
 349                         if (mdescr->mesh_param_num
 350                             == NL80211_MESHCONF_POWER_MODE)
 351                                 printf("%s must be set to active, light or "
 352                                         "deep.\n", mdescr->name);
 353                         else
 354                                 printf("%s must be set to a number "
 355                                         "between 0 and %u\n",
 356                                         mdescr->name, ret);
 357
 358                         return 2;
 359                 }
 360
 361                 err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
 362                 if (err)
 363                         return err;
 364         }
 365         nla_nest_end(msg, container);
 366
 367         return err;
 368 }
 369
 370 COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
 371         NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
 372         "Set mesh parameter (run command without any to see available ones).");
 373
 374 /* Getter */
 375 static int print_mesh_param_handler(struct nl_msg *msg, void *arg)
 376 {
 377         const struct mesh_param_descr *mdescr = arg;
 378         struct nlattr *attrs[NL80211_ATTR_MAX + 1];
 379         struct nlattr *parent_attr;
 380         struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
 381         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 382
 383         /* locate NL80211_ATTR_MESH_PARAMS */
 384         nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 385                   genlmsg_attrlen(gnlh, 0), NULL);
 386         parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
 387         if (!parent_attr)
 388                 return -EINVAL;
 389
 390         /* unpack the mesh parameters */
 391         if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
 392                              parent_attr, NULL))
 393                 return -EINVAL;
 394
 395         if (!mdescr) {
 396                 unsigned int i;
 397
 398                 for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 399                         mdescr = &_mesh_param_descrs[i];
 400                         printf("%s = ", mdescr->name);
 401                         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 402                         printf("\n");
 403                 }
 404                 return NL_SKIP;
 405         }
 406
 407         /* print out the mesh parameter */
 408         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 409         printf("\n");
 410         return NL_SKIP;
 411 }
 412
 413 static int get_interface_meshparam(struct nl80211_state *state,
 414                                    struct nl_msg *msg,
 415                                    int argc, char **argv,
 416                                    enum id_input id)
 417 {
 418         const struct mesh_param_descr *mdescr = NULL;
 419
 420         if (argc == 0) {
 421                 print_all_mesh_param_descr();
 422                 return 1;
 423         } else if (argc == 1) {
 424                 mdescr = find_mesh_param(argv[0]);
 425                 if (!mdescr) {
 426                         printf("Could not find the parameter %s.\n", argv[0]);
 427                         print_all_mesh_param_descr();
 428                         return 2;
 429                 }
 430         } else {
 431                 return 1;
 432         }
 433
 434         register_handler(print_mesh_param_handler, (void *)mdescr);
 435         return 0;
 436 }
 437
 438 COMMAND(get, mesh_param, "[<param>]",
 439         NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
 440         "Retrieve mesh parameter (run command without any to see available ones).");
 441
 442 static int join_mesh(struct nl80211_state *state,
 443                      struct nl_msg *msg, int argc, char **argv,
 444                      enum id_input id)
 445 {
 446         struct nlattr *container;
 447         float rate;
 448         unsigned char rates[NL80211_MAX_SUPP_RATES];
 449         int bintval, dtim_period, n_rates = 0;
 450         char *end, *value = NULL, *sptr = NULL;
 451
 452         if (argc < 1)
 453                 return 1;
 454
 455         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
 456         argc--;
 457         argv++;
 458
 459         /* freq */
 460         if (argc > 1 && strcmp(argv[0], "freq") == 0) {
 461                 struct chandef chandef;
 462                 int err, parsed;
 463
 464                 err = parse_freqchan(&chandef, false, argc - 1, argv + 1,
 465                                      &parsed);
 466                 if (err)
 467                         return err;
 468
 469                 argv += parsed + 1;
 470                 argc -= parsed + 1;
 471
 472                 err = put_chandef(msg, &chandef);
 473                 if (err)
 474                         return err;
 475         }
 476
 477         /* basic rates */
 478         if (argc > 1 && strcmp(argv[0], "basic-rates") == 0) {
 479                 argv++;
 480                 argc--;
 481
 482                 value = strtok_r(argv[0], ",", &sptr);
 483
 484                 while (value && n_rates < NL80211_MAX_SUPP_RATES) {
 485                         rate = strtod(value, &end);
 486                         rates[n_rates] = rate * 2;
 487
 488                         /* filter out suspicious values  */
 489                         if (*end != '\0' || !rates[n_rates] ||
 490                             rate*2 != rates[n_rates])
 491                                 return 1;
 492
 493                         n_rates++;
 494                         value = strtok_r(NULL, ",", &sptr);
 495                 }
 496
 497                 NLA_PUT(msg, NL80211_ATTR_BSS_BASIC_RATES, n_rates, rates);
 498                 argv++;
 499                 argc--;
 500         }
 501
 502         /* multicast rate */
 503         if (argc > 1 && strcmp(argv[0], "mcast-rate") == 0) {
 504                 argv++;
 505                 argc--;
 506
 507                 rate = strtod(argv[0], &end);
 508                 if (*end != '\0')
 509                         return 1;
 510
 511                 NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
 512                 argv++;
 513                 argc--;
 514         }
 515
 516         if (argc > 1 && strcmp(argv[0], "beacon-interval") == 0) {
 517                 argc--;
 518                 argv++;
 519
 520                 bintval = strtoul(argv[0], &end, 10);
 521                 if (*end != '\0')
 522                         return 1;
 523
 524                 NLA_PUT_U32(msg, NL80211_ATTR_BEACON_INTERVAL, bintval);
 525                 argv++;
 526                 argc--;
 527         }
 528
 529         if (argc > 1 && strcmp(argv[0], "dtim-period") == 0) {
 530                 argc--;
 531                 argv++;
 532
 533                 dtim_period = strtoul(argv[0], &end, 10);
 534                 if (*end != '\0')
 535                         return 1;
 536
 537                 NLA_PUT_U32(msg, NL80211_ATTR_DTIM_PERIOD, dtim_period);
 538                 argv++;
 539                 argc--;
 540         }
 541
 542         container = nla_nest_start(msg, NL80211_ATTR_MESH_SETUP);
 543         if (!container)
 544                 return -ENOBUFS;
 545
 546         if (argc > 1 && strcmp(argv[0], "vendor_sync") == 0) {
 547                 argv++;
 548                 argc--;
 549                 if (strcmp(argv[0], "on") == 0)
 550                         NLA_PUT_U8(msg,
 551                                    NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 1);
 552                 else
 553                         NLA_PUT_U8(msg,
 554                                    NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 0);
 555                 argv++;
 556                 argc--;
 557         }
 558         /* parse and put other NL80211_ATTR_MESH_SETUP elements here */
 559
 560         nla_nest_end(msg, container);
 561
 562         if (!argc)
 563                 return 0;
 564         return set_interface_meshparam(state, msg, argc, argv, id);
 565  nla_put_failure:
 566         return -ENOBUFS;
 567 }
 568 COMMAND(mesh, join, "<mesh ID> [[freq <freq in MHz> <NOHT|HT20|HT40+|HT40-|80MHz>]"
 569         " [basic-rates <rate in Mbps,rate2,...>]], [mcast-rate <rate in Mbps>]"
 570         " [beacon-interval <time in TUs>] [dtim-period <value>]"
 571         " [vendor_sync on|off] [<param>=<value>]*",
 572         NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
 573         "Join a mesh with the given mesh ID with frequency, basic-rates,\n"
 574         "mcast-rate and mesh parameters. Basic-rates are applied only if\n"
 575         "frequency is provided.");
 576
 577 static int leave_mesh(struct nl80211_state *state,
 578                       struct nl_msg *msg, int argc, char **argv,
 579                       enum id_input id)
 580 {
 581         if (argc)
 582                 return 1;
 583
 584         return 0;
 585 }
 586 COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
 587         "Leave a mesh.");