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                 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 void _print_u8(struct nlattr *a)
 100 {
 101         printf("%d", nla_get_u8(a));
 102 }
 103
 104 static void _print_u16(struct nlattr *a)
 105 {
 106         printf("%d", nla_get_u16(a));
 107 }
 108
 109 static void _print_u16_timeout(struct nlattr *a)
 110 {
 111         printf("%d milliseconds", nla_get_u16(a));
 112 }
 113
 114 static void _print_u16_in_TUs(struct nlattr *a)
 115 {
 116         printf("%d TUs", nla_get_u16(a));
 117 }
 118
 119 static void _print_u32_timeout(struct nlattr *a)
 120 {
 121         printf("%u milliseconds", nla_get_u32(a));
 122 }
 123
 124 static void _print_u32_in_TUs(struct nlattr *a)
 125 {
 126         printf("%d TUs", nla_get_u32(a));
 127 }
 128
 129 /* The current mesh parameters */
 130 const static struct mesh_param_descr _mesh_param_descrs[] =
 131 {
 132         {"mesh_retry_timeout",
 133         NL80211_MESHCONF_RETRY_TIMEOUT,
 134         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 135         {"mesh_confirm_timeout",
 136         NL80211_MESHCONF_CONFIRM_TIMEOUT,
 137         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 138         {"mesh_holding_timeout",
 139         NL80211_MESHCONF_HOLDING_TIMEOUT,
 140         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 141         {"mesh_max_peer_links",
 142         NL80211_MESHCONF_MAX_PEER_LINKS,
 143         _my_nla_put_u16, _parse_u16, _print_u16},
 144         {"mesh_max_retries",
 145         NL80211_MESHCONF_MAX_RETRIES,
 146         _my_nla_put_u8, _parse_u8, _print_u8},
 147         {"mesh_ttl",
 148         NL80211_MESHCONF_TTL,
 149         _my_nla_put_u8, _parse_u8, _print_u8},
 150         {"mesh_auto_open_plinks",
 151         NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 152         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 153         {"mesh_hwmp_max_preq_retries",
 154         NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
 155         _my_nla_put_u8, _parse_u8, _print_u8},
 156         {"mesh_path_refresh_time",
 157         NL80211_MESHCONF_PATH_REFRESH_TIME,
 158         _my_nla_put_u32, _parse_u32, _print_u32_timeout},
 159         {"mesh_min_discovery_timeout",
 160         NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
 161         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 162         {"mesh_hwmp_active_path_timeout",
 163         NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
 164         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 165         {"mesh_hwmp_preq_min_interval",
 166         NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
 167         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 168         {"mesh_hwmp_net_diameter_traversal_time",
 169         NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
 170         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 171         {"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
 172         _my_nla_put_u8, _parse_u8, _print_u8},
 173 };
 174
 175 static void print_all_mesh_param_descr(void)
 176 {
 177         int i;
 178
 179         printf("Possible mesh parameters are:\n");
 180
 181         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
 182                 printf(" - %s\n", _mesh_param_descrs[i].name);
 183 }
 184
 185 static const struct mesh_param_descr *find_mesh_param(const char *name)
 186 {
 187         int i;
 188         const struct mesh_param_descr *mdescr = NULL;
 189
 190         /* Find out what mesh parameter we want to change. */
 191         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 192                 if (!strcmp(_mesh_param_descrs[i].name, name))
 193                         return _mesh_param_descrs + i;
 194         }
 195
 196         if (!mdescr) {
 197                 print_all_mesh_param_descr();
 198                 return NULL;
 199         }
 200         return mdescr;
 201 }
 202
 203 /* Setter */
 204 static int set_interface_meshparam(struct nl80211_state *state,
 205                                    struct nl_cb *cb,
 206                                    struct nl_msg *msg,
 207                                    int argc, char **argv)
 208 {
 209         const struct mesh_param_descr *mdescr;
 210         struct nlattr *container;
 211         uint32_t ret;
 212         int err;
 213
 214         container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
 215         if (!container)
 216                 return -ENOBUFS;
 217
 218         if (!argc)
 219                 return 1;
 220
 221         while (argc) {
 222                 const char *name;
 223                 char *value;
 224                 _any any;
 225
 226                 memset(&any, 0, sizeof(_any));
 227
 228                 name = argv[0];
 229                 value = strchr(name, '=');
 230                 if (value) {
 231                         *value = '\0';
 232                         value++;
 233                         argc--;
 234                         argv++;
 235                 } else {
 236                         /* backward compat -- accept w/o '=' */
 237                         if (argc < 2) {
 238                                 printf("Must specify a value for %s.\n", name);
 239                                 return 2;
 240                         }
 241                         value = argv[1];
 242                         argc -= 2;
 243                         argv += 2;
 244                 }
 245
 246                 mdescr = find_mesh_param(name);
 247                 if (!mdescr)
 248                         return 2;
 249
 250                 /* Parse the new value */
 251                 ret = mdescr->parse_fn(value, &any);
 252                 if (ret != 0) {
 253                         printf("%s must be set to a number "
 254                                "between 0 and %u\n", mdescr->name, ret);
 255                         return 2;
 256                 }
 257
 258                 err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
 259                 if (err)
 260                         return err;
 261         }
 262         nla_nest_end(msg, container);
 263
 264         return err;
 265 }
 266
 267 COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
 268         NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
 269         "Set mesh parameter (run command without any to see available ones).");
 270
 271 /* Getter */
 272 static int print_mesh_param_handler(struct nl_msg *msg, void *arg)
 273 {
 274         const struct mesh_param_descr *mdescr = arg;
 275         struct nlattr *attrs[NL80211_ATTR_MAX + 1];
 276         struct nlattr *parent_attr;
 277         struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
 278         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 279
 280         /* locate NL80211_ATTR_MESH_PARAMS */
 281         nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 282                   genlmsg_attrlen(gnlh, 0), NULL);
 283         parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
 284         if (!parent_attr)
 285                 return -EINVAL;
 286
 287         /* unpack the mesh parameters */
 288         if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
 289                              parent_attr, NULL))
 290                 return -EINVAL;
 291
 292         if (!mdescr) {
 293                 int i;
 294
 295                 for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 296                         mdescr = &_mesh_param_descrs[i];
 297                         printf("%s = ", mdescr->name);
 298                         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 299                         printf("\n");
 300                 }
 301                 return NL_SKIP;
 302         }
 303
 304         /* print out the mesh parameter */
 305         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 306         printf("\n");
 307         return NL_SKIP;
 308 }
 309
 310 static int get_interface_meshparam(struct nl80211_state *state,
 311                                    struct nl_cb *cb,
 312                                    struct nl_msg *msg,
 313                                    int argc, char **argv)
 314 {
 315         const struct mesh_param_descr *mdescr = NULL;
 316
 317         if (argc > 1)
 318                 return 1;
 319
 320         if (argc == 1) {
 321                 mdescr = find_mesh_param(argv[0]);
 322                 if (!mdescr)
 323                         return 2;
 324         }
 325
 326         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
 327                   print_mesh_param_handler, (void *)mdescr);
 328         return 0;
 329 }
 330
 331 COMMAND(get, mesh_param, "[<param>]",
 332         NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
 333         "Retrieve mesh parameter (run command without any to see available ones).");
 334
 335 static int join_mesh(struct nl80211_state *state, struct nl_cb *cb,
 336                      struct nl_msg *msg, int argc, char **argv)
 337 {
 338         if (argc < 1)
 339                 return 1;
 340
 341         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
 342         argc--;
 343         argv++;
 344
 345         if (!argc)
 346                 return 0;
 347         return set_interface_meshparam(state, cb, msg, argc, argv);
 348  nla_put_failure:
 349         return -ENOBUFS;
 350 }
 351 COMMAND(mesh, join, "<mesh ID> [<param>=<value>]*",
 352         NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
 353         "Join a mesh with the given mesh ID and mesh parameters.");
 354
 355 static int leave_mesh(struct nl80211_state *state, struct nl_cb *cb,
 356                       struct nl_msg *msg, int argc, char **argv)
 357 {
 358         if (argc)
 359                 return 1;
 360
 361         return 0;
 362 }
 363 COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
 364         "Leave a mesh.");