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_TUs(struct nlattr *a)
 161 {
 162         printf("%d TUs", nla_get_u32(a));
 163 }
 164
 165 static void _print_u32_power_mode(struct nlattr *a)
 166 {
 167         unsigned long v = nla_get_u32(a);
 168
 169         switch (v) {
 170         case NL80211_MESH_POWER_ACTIVE:
 171                 printf("active");
 172                 break;
 173         case NL80211_MESH_POWER_LIGHT_SLEEP:
 174                 printf("light");
 175                 break;
 176         case NL80211_MESH_POWER_DEEP_SLEEP:
 177                 printf("deep");
 178                 break;
 179         default:
 180                 printf("undefined");
 181                 break;
 182         }
 183 }
 184
 185 static void _print_s32_in_dBm(struct nlattr *a)
 186 {
 187         printf("%d dBm", (int32_t) nla_get_u32(a));
 188 }
 189
 190
 191 /* The current mesh parameters */
 192 const static struct mesh_param_descr _mesh_param_descrs[] =
 193 {
 194         {"mesh_retry_timeout",
 195         NL80211_MESHCONF_RETRY_TIMEOUT,
 196         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 197         {"mesh_confirm_timeout",
 198         NL80211_MESHCONF_CONFIRM_TIMEOUT,
 199         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 200         {"mesh_holding_timeout",
 201         NL80211_MESHCONF_HOLDING_TIMEOUT,
 202         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 203         {"mesh_max_peer_links",
 204         NL80211_MESHCONF_MAX_PEER_LINKS,
 205         _my_nla_put_u16, _parse_u16, _print_u16},
 206         {"mesh_max_retries",
 207         NL80211_MESHCONF_MAX_RETRIES,
 208         _my_nla_put_u8, _parse_u8, _print_u8},
 209         {"mesh_ttl",
 210         NL80211_MESHCONF_TTL,
 211         _my_nla_put_u8, _parse_u8, _print_u8},
 212         {"mesh_element_ttl",
 213         NL80211_MESHCONF_ELEMENT_TTL,
 214         _my_nla_put_u8, _parse_u8, _print_u8},
 215         {"mesh_auto_open_plinks",
 216         NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 217         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 218         {"mesh_hwmp_max_preq_retries",
 219         NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
 220         _my_nla_put_u8, _parse_u8, _print_u8},
 221         {"mesh_path_refresh_time",
 222         NL80211_MESHCONF_PATH_REFRESH_TIME,
 223         _my_nla_put_u32, _parse_u32, _print_u32_timeout},
 224         {"mesh_min_discovery_timeout",
 225         NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
 226         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 227         {"mesh_hwmp_active_path_timeout",
 228         NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
 229         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 230         {"mesh_hwmp_preq_min_interval",
 231         NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
 232         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 233         {"mesh_hwmp_net_diameter_traversal_time",
 234         NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
 235         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 236         {"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
 237         _my_nla_put_u8, _parse_u8, _print_u8},
 238         {"mesh_hwmp_rann_interval", NL80211_MESHCONF_HWMP_RANN_INTERVAL,
 239         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 240         {"mesh_gate_announcements", NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
 241         _my_nla_put_u8, _parse_u8, _print_u8},
 242         {"mesh_fwding", NL80211_MESHCONF_FORWARDING,
 243         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 244         {"mesh_sync_offset_max_neighor",
 245         NL80211_MESHCONF_SYNC_OFFSET_MAX_NEIGHBOR,
 246         _my_nla_put_u32, _parse_u32, _print_u32},
 247         {"mesh_rssi_threshold", NL80211_MESHCONF_RSSI_THRESHOLD,
 248         _my_nla_put_u32, _parse_s32, _print_s32_in_dBm},
 249         {"mesh_hwmp_active_path_to_root_timeout",
 250         NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,
 251         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 252         {"mesh_hwmp_root_interval", NL80211_MESHCONF_HWMP_ROOT_INTERVAL,
 253         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 254         {"mesh_hwmp_confirmation_interval",
 255         NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
 256         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 257         {"mesh_power_mode", NL80211_MESHCONF_POWER_MODE,
 258         _my_nla_put_u32, _parse_u32_power_mode, _print_u32_power_mode},
 259         {"mesh_awake_window", NL80211_MESHCONF_AWAKE_WINDOW,
 260         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 261 };
 262
 263 static void print_all_mesh_param_descr(void)
 264 {
 265         int i;
 266
 267         printf("Possible mesh parameters are:\n");
 268
 269         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
 270                 printf(" - %s\n", _mesh_param_descrs[i].name);
 271 }
 272
 273 static const struct mesh_param_descr *find_mesh_param(const char *name)
 274 {
 275         int i;
 276
 277         /* Find out what mesh parameter we want to change. */
 278         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 279                 if (strcmp(_mesh_param_descrs[i].name, name) == 0)
 280                         return _mesh_param_descrs + i;
 281         }
 282
 283         print_all_mesh_param_descr();
 284         return NULL;
 285 }
 286
 287 /* Setter */
 288 static int set_interface_meshparam(struct nl80211_state *state,
 289                                    struct nl_cb *cb,
 290                                    struct nl_msg *msg,
 291                                    int argc, char **argv,
 292                                    enum id_input id)
 293 {
 294         const struct mesh_param_descr *mdescr;
 295         struct nlattr *container;
 296         uint32_t ret;
 297         int err;
 298
 299         container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
 300         if (!container)
 301                 return -ENOBUFS;
 302
 303         if (!argc)
 304                 return 1;
 305
 306         while (argc) {
 307                 const char *name;
 308                 char *value;
 309                 _any any;
 310
 311                 memset(&any, 0, sizeof(_any));
 312
 313                 name = argv[0];
 314                 value = strchr(name, '=');
 315                 if (value) {
 316                         *value = '\0';
 317                         value++;
 318                         argc--;
 319                         argv++;
 320                 } else {
 321                         /* backward compat -- accept w/o '=' */
 322                         if (argc < 2) {
 323                                 printf("Must specify a value for %s.\n", name);
 324                                 return 2;
 325                         }
 326                         value = argv[1];
 327                         argc -= 2;
 328                         argv += 2;
 329                 }
 330
 331                 mdescr = find_mesh_param(name);
 332                 if (!mdescr)
 333                         return 2;
 334
 335                 /* Parse the new value */
 336                 ret = mdescr->parse_fn(value, &any);
 337                 if (ret != 0) {
 338                         if (mdescr->mesh_param_num
 339                             == NL80211_MESHCONF_POWER_MODE)
 340                                 printf("%s must be set to active, light or "
 341                                         "deep.\n", mdescr->name);
 342                         else
 343                                 printf("%s must be set to a number "
 344                                         "between 0 and %u\n",
 345                                         mdescr->name, ret);
 346
 347                         return 2;
 348                 }
 349
 350                 err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
 351                 if (err)
 352                         return err;
 353         }
 354         nla_nest_end(msg, container);
 355
 356         return err;
 357 }
 358
 359 COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
 360         NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
 361         "Set mesh parameter (run command without any to see available ones).");
 362
 363 /* Getter */
 364 static int print_mesh_param_handler(struct nl_msg *msg, void *arg)
 365 {
 366         const struct mesh_param_descr *mdescr = arg;
 367         struct nlattr *attrs[NL80211_ATTR_MAX + 1];
 368         struct nlattr *parent_attr;
 369         struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
 370         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 371
 372         /* locate NL80211_ATTR_MESH_PARAMS */
 373         nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 374                   genlmsg_attrlen(gnlh, 0), NULL);
 375         parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
 376         if (!parent_attr)
 377                 return -EINVAL;
 378
 379         /* unpack the mesh parameters */
 380         if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
 381                              parent_attr, NULL))
 382                 return -EINVAL;
 383
 384         if (!mdescr) {
 385                 int i;
 386
 387                 for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 388                         mdescr = &_mesh_param_descrs[i];
 389                         printf("%s = ", mdescr->name);
 390                         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 391                         printf("\n");
 392                 }
 393                 return NL_SKIP;
 394         }
 395
 396         /* print out the mesh parameter */
 397         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 398         printf("\n");
 399         return NL_SKIP;
 400 }
 401
 402 static int get_interface_meshparam(struct nl80211_state *state,
 403                                    struct nl_cb *cb,
 404                                    struct nl_msg *msg,
 405                                    int argc, char **argv,
 406                                    enum id_input id)
 407 {
 408         const struct mesh_param_descr *mdescr = NULL;
 409
 410         if (argc > 1)
 411                 return 1;
 412
 413         if (argc == 1) {
 414                 mdescr = find_mesh_param(argv[0]);
 415                 if (!mdescr)
 416                         return 2;
 417         }
 418
 419         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
 420                   print_mesh_param_handler, (void *)mdescr);
 421         return 0;
 422 }
 423
 424 COMMAND(get, mesh_param, "[<param>]",
 425         NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
 426         "Retrieve mesh parameter (run command without any to see available ones).");
 427
 428 static int join_mesh(struct nl80211_state *state, struct nl_cb *cb,
 429                      struct nl_msg *msg, int argc, char **argv,
 430                      enum id_input id)
 431 {
 432         struct nlattr *container;
 433         float rate;
 434         int bintval, dtim_period;
 435         char *end;
 436
 437         if (argc < 1)
 438                 return 1;
 439
 440         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
 441         argc--;
 442         argv++;
 443
 444         if (argc > 1 && strcmp(argv[0], "mcast-rate") == 0) {
 445                 argv++;
 446                 argc--;
 447
 448                 rate = strtod(argv[0], &end);
 449                 if (*end != '\0')
 450                         return 1;
 451
 452                 NLA_PUT_U32(msg, NL80211_ATTR_MCAST_RATE, (int)(rate * 10));
 453                 argv++;
 454                 argc--;
 455         }
 456
 457         if (argc > 1 && strcmp(argv[0], "beacon-interval") == 0) {
 458                 argc--;
 459                 argv++;
 460
 461                 bintval = strtoul(argv[0], &end, 10);
 462                 if (*end != '\0')
 463                         return 1;
 464
 465                 NLA_PUT_U32(msg, NL80211_ATTR_BEACON_INTERVAL, bintval);
 466                 argv++;
 467                 argc--;
 468         }
 469
 470         if (argc > 1 && strcmp(argv[0], "dtim-period") == 0) {
 471                 argc--;
 472                 argv++;
 473
 474                 dtim_period = strtoul(argv[0], &end, 10);
 475                 if (*end != '\0')
 476                         return 1;
 477
 478                 NLA_PUT_U32(msg, NL80211_ATTR_DTIM_PERIOD, dtim_period);
 479                 argv++;
 480                 argc--;
 481         }
 482
 483         container = nla_nest_start(msg, NL80211_ATTR_MESH_SETUP);
 484         if (!container)
 485                 return -ENOBUFS;
 486
 487         if (argc > 1 && strcmp(argv[0], "vendor_sync") == 0) {
 488                 argv++;
 489                 argc--;
 490                 if (strcmp(argv[0], "on") == 0)
 491                         NLA_PUT_U8(msg,
 492                                    NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 1);
 493                 else
 494                         NLA_PUT_U8(msg,
 495                                    NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC, 0);
 496                 argv++;
 497                 argc--;
 498         }
 499         /* parse and put other NL80211_ATTR_MESH_SETUP elements here */
 500
 501         nla_nest_end(msg, container);
 502
 503         if (!argc)
 504                 return 0;
 505         return set_interface_meshparam(state, cb, msg, argc, argv, id);
 506  nla_put_failure:
 507         return -ENOBUFS;
 508 }
 509 COMMAND(mesh, join, "<mesh ID> [mcast-rate <rate in Mbps>]"
 510         " [beacon-interval <time in TUs>] [dtim-period <value>]"
 511         " [vendor_sync on|off] [<param>=<value>]*",
 512         NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
 513         "Join a mesh with the given mesh ID with mcast-rate and mesh parameters.");
 514
 515 static int leave_mesh(struct nl80211_state *state, struct nl_cb *cb,
 516                       struct nl_msg *msg, int argc, char **argv,
 517                       enum id_input id)
 518 {
 519         if (argc)
 520                 return 1;
 521
 522         return 0;
 523 }
 524 COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
 525         "Leave a mesh.");