mesh.c

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