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_element_ttl",
 151         NL80211_MESHCONF_ELEMENT_TTL,
 152         _my_nla_put_u8, _parse_u8, _print_u8},
 153         {"mesh_auto_open_plinks",
 154         NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 155         _my_nla_put_u8, _parse_u8_as_bool, _print_u8},
 156         {"mesh_hwmp_max_preq_retries",
 157         NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
 158         _my_nla_put_u8, _parse_u8, _print_u8},
 159         {"mesh_path_refresh_time",
 160         NL80211_MESHCONF_PATH_REFRESH_TIME,
 161         _my_nla_put_u32, _parse_u32, _print_u32_timeout},
 162         {"mesh_min_discovery_timeout",
 163         NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
 164         _my_nla_put_u16, _parse_u16, _print_u16_timeout},
 165         {"mesh_hwmp_active_path_timeout",
 166         NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
 167         _my_nla_put_u32, _parse_u32, _print_u32_in_TUs},
 168         {"mesh_hwmp_preq_min_interval",
 169         NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
 170         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 171         {"mesh_hwmp_net_diameter_traversal_time",
 172         NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
 173         _my_nla_put_u16, _parse_u16, _print_u16_in_TUs},
 174         {"mesh_hwmp_rootmode", NL80211_MESHCONF_HWMP_ROOTMODE,
 175         _my_nla_put_u8, _parse_u8, _print_u8},
 176 };
 177
 178 static void print_all_mesh_param_descr(void)
 179 {
 180         int i;
 181
 182         printf("Possible mesh parameters are:\n");
 183
 184         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++)
 185                 printf(" - %s\n", _mesh_param_descrs[i].name);
 186 }
 187
 188 static const struct mesh_param_descr *find_mesh_param(const char *name)
 189 {
 190         int i;
 191         const struct mesh_param_descr *mdescr = NULL;
 192
 193         /* Find out what mesh parameter we want to change. */
 194         for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 195                 if (!strcmp(_mesh_param_descrs[i].name, name))
 196                         return _mesh_param_descrs + i;
 197         }
 198
 199         if (!mdescr) {
 200                 print_all_mesh_param_descr();
 201                 return NULL;
 202         }
 203         return mdescr;
 204 }
 205
 206 /* Setter */
 207 static int set_interface_meshparam(struct nl80211_state *state,
 208                                    struct nl_cb *cb,
 209                                    struct nl_msg *msg,
 210                                    int argc, char **argv)
 211 {
 212         const struct mesh_param_descr *mdescr;
 213         struct nlattr *container;
 214         uint32_t ret;
 215         int err;
 216
 217         container = nla_nest_start(msg, NL80211_ATTR_MESH_PARAMS);
 218         if (!container)
 219                 return -ENOBUFS;
 220
 221         if (!argc)
 222                 return 1;
 223
 224         while (argc) {
 225                 const char *name;
 226                 char *value;
 227                 _any any;
 228
 229                 memset(&any, 0, sizeof(_any));
 230
 231                 name = argv[0];
 232                 value = strchr(name, '=');
 233                 if (value) {
 234                         *value = '\0';
 235                         value++;
 236                         argc--;
 237                         argv++;
 238                 } else {
 239                         /* backward compat -- accept w/o '=' */
 240                         if (argc < 2) {
 241                                 printf("Must specify a value for %s.\n", name);
 242                                 return 2;
 243                         }
 244                         value = argv[1];
 245                         argc -= 2;
 246                         argv += 2;
 247                 }
 248
 249                 mdescr = find_mesh_param(name);
 250                 if (!mdescr)
 251                         return 2;
 252
 253                 /* Parse the new value */
 254                 ret = mdescr->parse_fn(value, &any);
 255                 if (ret != 0) {
 256                         printf("%s must be set to a number "
 257                                "between 0 and %u\n", mdescr->name, ret);
 258                         return 2;
 259                 }
 260
 261                 err = mdescr->nla_put_fn(msg, mdescr->mesh_param_num, &any);
 262                 if (err)
 263                         return err;
 264         }
 265         nla_nest_end(msg, container);
 266
 267         return err;
 268 }
 269
 270 COMMAND(set, mesh_param, "<param>=<value> [<param>=<value>]*",
 271         NL80211_CMD_SET_MESH_PARAMS, 0, CIB_NETDEV, set_interface_meshparam,
 272         "Set mesh parameter (run command without any to see available ones).");
 273
 274 /* Getter */
 275 static int print_mesh_param_handler(struct nl_msg *msg, void *arg)
 276 {
 277         const struct mesh_param_descr *mdescr = arg;
 278         struct nlattr *attrs[NL80211_ATTR_MAX + 1];
 279         struct nlattr *parent_attr;
 280         struct nlattr *mesh_params[NL80211_MESHCONF_ATTR_MAX + 1];
 281         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 282
 283         /* locate NL80211_ATTR_MESH_PARAMS */
 284         nla_parse(attrs, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 285                   genlmsg_attrlen(gnlh, 0), NULL);
 286         parent_attr = attrs[NL80211_ATTR_MESH_PARAMS];
 287         if (!parent_attr)
 288                 return -EINVAL;
 289
 290         /* unpack the mesh parameters */
 291         if (nla_parse_nested(mesh_params, NL80211_MESHCONF_ATTR_MAX,
 292                              parent_attr, NULL))
 293                 return -EINVAL;
 294
 295         if (!mdescr) {
 296                 int i;
 297
 298                 for (i = 0; i < ARRAY_SIZE(_mesh_param_descrs); i++) {
 299                         mdescr = &_mesh_param_descrs[i];
 300                         printf("%s = ", mdescr->name);
 301                         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 302                         printf("\n");
 303                 }
 304                 return NL_SKIP;
 305         }
 306
 307         /* print out the mesh parameter */
 308         mdescr->nla_print_fn(mesh_params[mdescr->mesh_param_num]);
 309         printf("\n");
 310         return NL_SKIP;
 311 }
 312
 313 static int get_interface_meshparam(struct nl80211_state *state,
 314                                    struct nl_cb *cb,
 315                                    struct nl_msg *msg,
 316                                    int argc, char **argv)
 317 {
 318         const struct mesh_param_descr *mdescr = NULL;
 319
 320         if (argc > 1)
 321                 return 1;
 322
 323         if (argc == 1) {
 324                 mdescr = find_mesh_param(argv[0]);
 325                 if (!mdescr)
 326                         return 2;
 327         }
 328
 329         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
 330                   print_mesh_param_handler, (void *)mdescr);
 331         return 0;
 332 }
 333
 334 COMMAND(get, mesh_param, "[<param>]",
 335         NL80211_CMD_GET_MESH_PARAMS, 0, CIB_NETDEV, get_interface_meshparam,
 336         "Retrieve mesh parameter (run command without any to see available ones).");
 337
 338 static int join_mesh(struct nl80211_state *state, struct nl_cb *cb,
 339                      struct nl_msg *msg, int argc, char **argv)
 340 {
 341         if (argc < 1)
 342                 return 1;
 343
 344         NLA_PUT(msg, NL80211_ATTR_MESH_ID, strlen(argv[0]), argv[0]);
 345         argc--;
 346         argv++;
 347
 348         if (!argc)
 349                 return 0;
 350         return set_interface_meshparam(state, cb, msg, argc, argv);
 351  nla_put_failure:
 352         return -ENOBUFS;
 353 }
 354 COMMAND(mesh, join, "<mesh ID> [<param>=<value>]*",
 355         NL80211_CMD_JOIN_MESH, 0, CIB_NETDEV, join_mesh,
 356         "Join a mesh with the given mesh ID and mesh parameters.");
 357
 358 static int leave_mesh(struct nl80211_state *state, struct nl_cb *cb,
 359                       struct nl_msg *msg, int argc, char **argv)
 360 {
 361         if (argc)
 362                 return 1;
 363
 364         return 0;
 365 }
 366 COMMAND(mesh, leave, NULL, NL80211_CMD_LEAVE_MESH, 0, CIB_NETDEV, leave_mesh,
 367         "Leave a mesh.");