src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <net/if.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <syslog.h>
  11
  12 #include <uci.h>
  13 #include <uci_blob.h>
  14 #include <libubox/utils.h>
  15 #include <libubox/avl.h>
  16 #include <libubox/avl-cmp.h>
  17 #include <libubox/list.h>
  18 #include <libubox/vlist.h>
  19
  20 #include "odhcpd.h"
  21
  22 static struct blob_buf b;
  23 static int reload_pipe[2] = { -1, -1 };
  24
  25 static int lease_cmp(const void *k1, const void *k2, void *ptr);
  26 static void lease_update(struct vlist_tree *tree, struct vlist_node *node_new,
  27                          struct vlist_node *node_old);
  28
  29 struct vlist_tree leases = VLIST_TREE_INIT(leases, lease_cmp, lease_update, true, false);
  30 AVL_TREE(interfaces, avl_strcmp, false, NULL);
  31 struct config config = {.legacy = false, .main_dhcpv4 = false,
  32                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  33                         .log_level = LOG_WARNING};
  34
  35 #define START_DEFAULT   100
  36 #define LIMIT_DEFAULT   150
  37
  38 #define OAF_DHCPV6      (OAF_DHCPV6_NA | OAF_DHCPV6_PD)
  39
  40 enum {
  41         IFACE_ATTR_INTERFACE,
  42         IFACE_ATTR_IFNAME,
  43         IFACE_ATTR_NETWORKID,
  44         IFACE_ATTR_DYNAMICDHCP,
  45         IFACE_ATTR_LEASETIME,
  46         IFACE_ATTR_LIMIT,
  47         IFACE_ATTR_START,
  48         IFACE_ATTR_MASTER,
  49         IFACE_ATTR_UPSTREAM,
  50         IFACE_ATTR_RA,
  51         IFACE_ATTR_DHCPV4,
  52         IFACE_ATTR_DHCPV6,
  53         IFACE_ATTR_NDP,
  54         IFACE_ATTR_ROUTER,
  55         IFACE_ATTR_DNS,
  56         IFACE_ATTR_DOMAIN,
  57         IFACE_ATTR_FILTER_CLASS,
  58         IFACE_ATTR_DHCPV4_FORCERECONF,
  59         IFACE_ATTR_DHCPV6_RAW,
  60         IFACE_ATTR_DHCPV6_ASSIGNALL,
  61         IFACE_ATTR_DHCPV6_PD,
  62         IFACE_ATTR_DHCPV6_NA,
  63         IFACE_ATTR_RA_DEFAULT,
  64         IFACE_ATTR_RA_MANAGEMENT,
  65         IFACE_ATTR_RA_FLAGS,
  66         IFACE_ATTR_RA_SLAAC,
  67         IFACE_ATTR_RA_OFFLINK,
  68         IFACE_ATTR_RA_PREFERENCE,
  69         IFACE_ATTR_RA_ADVROUTER,
  70         IFACE_ATTR_RA_MININTERVAL,
  71         IFACE_ATTR_RA_MAXINTERVAL,
  72         IFACE_ATTR_RA_LIFETIME,
  73         IFACE_ATTR_RA_USELEASETIME,
  74         IFACE_ATTR_RA_REACHABLETIME,
  75         IFACE_ATTR_RA_RETRANSTIME,
  76         IFACE_ATTR_RA_HOPLIMIT,
  77         IFACE_ATTR_RA_MTU,
  78         IFACE_ATTR_RA_DNS,
  79         IFACE_ATTR_PD_MANAGER,
  80         IFACE_ATTR_PD_CER,
  81         IFACE_ATTR_NDPROXY_ROUTING,
  82         IFACE_ATTR_NDPROXY_SLAVE,
  83         IFACE_ATTR_PREFIX_FILTER,
  84         IFACE_ATTR_MAX
  85 };
  86
  87 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  88         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  91         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  92         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  97         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  98         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  99         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
 101         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
 102         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
 103         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
 104         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 105         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 106         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 109         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 110         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 111         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 112         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 113         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 114         [IFACE_ATTR_RA_FLAGS] = { .name = "ra_flags", . type = BLOBMSG_TYPE_ARRAY },
 115         [IFACE_ATTR_RA_SLAAC] = { .name = "ra_slaac", .type = BLOBMSG_TYPE_BOOL },
 116         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 117         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 118         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 119         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 121         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 122         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 123         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 124         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 125         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 126         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 127         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 128         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 129         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 130         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 131 };
 132
 133 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 134         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 135         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 136         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 137 };
 138
 139 const struct uci_blob_param_list interface_attr_list = {
 140         .n_params = IFACE_ATTR_MAX,
 141         .params = iface_attrs,
 142         .info = iface_attr_info,
 143 };
 144
 145 enum {
 146         LEASE_ATTR_IP,
 147         LEASE_ATTR_MAC,
 148         LEASE_ATTR_DUID,
 149         LEASE_ATTR_HOSTID,
 150         LEASE_ATTR_LEASETIME,
 151         LEASE_ATTR_NAME,
 152         LEASE_ATTR_MAX
 153 };
 154
 155 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 156         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 157         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 158         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 159         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 160         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 161         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 162 };
 163
 164 const struct uci_blob_param_list lease_attr_list = {
 165         .n_params = LEASE_ATTR_MAX,
 166         .params = lease_attrs,
 167 };
 168
 169 enum {
 170         ODHCPD_ATTR_LEGACY,
 171         ODHCPD_ATTR_MAINDHCP,
 172         ODHCPD_ATTR_LEASEFILE,
 173         ODHCPD_ATTR_LEASETRIGGER,
 174         ODHCPD_ATTR_LOGLEVEL,
 175         ODHCPD_ATTR_MAX
 176 };
 177
 178 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 179         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 180         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 181         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 182         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 183         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 184 };
 185
 186 const struct uci_blob_param_list odhcpd_attr_list = {
 187         .n_params = ODHCPD_ATTR_MAX,
 188         .params = odhcpd_attrs,
 189 };
 190
 191 static const struct { const char *name; uint8_t flag; } ra_flags[] = {
 192         { .name = "managed-config", .flag = ND_RA_FLAG_MANAGED },
 193         { .name = "other-config", .flag = ND_RA_FLAG_OTHER },
 194         { .name = "home-agent", .flag = ND_RA_FLAG_HOME_AGENT },
 195         { .name = "none", . flag = 0 },
 196         { .name = NULL, },
 197 };
 198
 199 static int mkdir_p(char *dir, mode_t mask)
 200 {
 201         char *l = strrchr(dir, '/');
 202         int ret;
 203
 204         if (!l)
 205                 return 0;
 206
 207         *l = '\0';
 208
 209         if (mkdir_p(dir, mask))
 210                 return -1;
 211
 212         *l = '/';
 213
 214         ret = mkdir(dir, mask);
 215         if (ret && errno == EEXIST)
 216                 return 0;
 217
 218         if (ret)
 219                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 220
 221         return ret;
 222 }
 223
 224 static void set_interface_defaults(struct interface *iface)
 225 {
 226         iface->ignore = true;
 227         iface->dhcpv4 = MODE_DISABLED;
 228         iface->dhcpv6 = MODE_DISABLED;
 229         iface->ra = MODE_DISABLED;
 230         iface->ndp = MODE_DISABLED;
 231         iface->learn_routes = 1;
 232         iface->dhcp_leasetime = 43200;
 233         iface->dhcpv4_start.s_addr = htonl(START_DEFAULT);
 234         iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
 235         iface->dhcpv6_assignall = true;
 236         iface->dhcpv6_pd = true;
 237         iface->dhcpv6_na = true;
 238         iface->ra_flags = ND_RA_FLAG_OTHER;
 239         iface->ra_slaac = true;
 240         iface->ra_maxinterval = 600;
 241         iface->ra_mininterval = iface->ra_maxinterval/3;
 242         iface->ra_lifetime = -1;
 243         iface->ra_dns = true;
 244 }
 245
 246 static void clean_interface(struct interface *iface)
 247 {
 248         free(iface->dns);
 249         free(iface->search);
 250         free(iface->upstream);
 251         free(iface->dhcpv4_router);
 252         free(iface->dhcpv4_dns);
 253         free(iface->dhcpv6_raw);
 254         free(iface->filter_class);
 255         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 256         set_interface_defaults(iface);
 257 }
 258
 259 static void close_interface(struct interface *iface)
 260 {
 261         avl_delete(&interfaces, &iface->avl);
 262
 263         router_setup_interface(iface, false);
 264         dhcpv6_setup_interface(iface, false);
 265         ndp_setup_interface(iface, false);
 266 #ifdef DHCPV4_SUPPORT
 267         dhcpv4_setup_interface(iface, false);
 268 #endif
 269
 270         clean_interface(iface);
 271         free(iface->addr4);
 272         free(iface->addr6);
 273         free(iface->ifname);
 274         free(iface);
 275 }
 276
 277 static int parse_mode(const char *mode)
 278 {
 279         if (!strcmp(mode, "disabled"))
 280                 return MODE_DISABLED;
 281         else if (!strcmp(mode, "server"))
 282                 return MODE_SERVER;
 283         else if (!strcmp(mode, "relay"))
 284                 return MODE_RELAY;
 285         else if (!strcmp(mode, "hybrid"))
 286                 return MODE_HYBRID;
 287         else
 288                 return -1;
 289 }
 290
 291 static int parse_ra_flags(uint8_t *flags, struct blob_attr *attr)
 292 {
 293         struct blob_attr *cur;
 294         unsigned rem;
 295
 296         blobmsg_for_each_attr(cur, attr, rem) {
 297                 int i;
 298
 299                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 300                         continue;
 301
 302                 if (!blobmsg_check_attr(cur, false))
 303                         continue;
 304
 305                 for (i = 0; ra_flags[i].name; i++) {
 306                         if (!strcmp(ra_flags[i].name, blobmsg_get_string(cur))) {
 307                                 *flags |= ra_flags[i].flag;
 308                                 break;
 309                         }
 310                 }
 311
 312                 if (!ra_flags[i].name)
 313                         return -1;
 314         }
 315
 316         return 0;
 317 }
 318
 319 static void set_config(struct uci_section *s)
 320 {
 321         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 322
 323         blob_buf_init(&b, 0);
 324         uci_to_blob(&b, s, &odhcpd_attr_list);
 325         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 326
 327         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 328                 config.legacy = blobmsg_get_bool(c);
 329
 330         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 331                 config.main_dhcpv4 = blobmsg_get_bool(c);
 332
 333         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 334                 free(config.dhcp_statefile);
 335                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 336         }
 337
 338         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 339                 free(config.dhcp_cb);
 340                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 341         }
 342
 343         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 344                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 345
 346                 if (config.log_level != log_level) {
 347                         config.log_level = log_level;
 348                         setlogmask(LOG_UPTO(config.log_level));
 349                 }
 350         }
 351 }
 352
 353 static double parse_leasetime(struct blob_attr *c) {
 354         char *val = blobmsg_get_string(c), *endptr = NULL;
 355         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 356
 357         if (time && endptr && endptr[0]) {
 358                 if (endptr[0] == 's')
 359                         time *= 1;
 360                 else if (endptr[0] == 'm')
 361                         time *= 60;
 362                 else if (endptr[0] == 'h')
 363                         time *= 3600;
 364                 else if (endptr[0] == 'd')
 365                         time *= 24 * 3600;
 366                 else if (endptr[0] == 'w')
 367                         time *= 7 * 24 * 3600;
 368                 else
 369                         goto err;
 370         }
 371
 372         if (time < 60)
 373                 time = 60;
 374
 375         return time;
 376
 377 err:
 378         return -1;
 379 }
 380
 381 static void free_lease(struct lease *l)
 382 {
 383         free(l->hostname);
 384         free(l);
 385 }
 386
 387 static int set_lease(struct uci_section *s)
 388 {
 389         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 390         struct lease *l;
 391         size_t duidlen = 0;
 392         uint8_t *duid;
 393
 394         blob_buf_init(&b, 0);
 395         uci_to_blob(&b, s, &lease_attr_list);
 396         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 397
 398         if ((c = tb[LEASE_ATTR_DUID]))
 399                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 400
 401         l = calloc_a(sizeof(*l), &duid, duidlen);
 402         if (!l)
 403                 goto err;
 404
 405         if ((c = tb[LEASE_ATTR_MAC]))
 406                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 407                         goto err;
 408
 409         if ((c = tb[LEASE_ATTR_DUID])) {
 410                 ssize_t len;
 411
 412                 l->duid = duid;
 413                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 414
 415                 if (len < 0)
 416                         goto err;
 417
 418                 l->duid_len = len;
 419         }
 420
 421         if ((c = tb[LEASE_ATTR_NAME])) {
 422                 l->hostname = strdup(blobmsg_get_string(c));
 423                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 424                         goto err;
 425         }
 426
 427         if ((c = tb[LEASE_ATTR_IP]))
 428                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 429                         goto err;
 430
 431         if ((c = tb[LEASE_ATTR_HOSTID])) {
 432                 errno = 0;
 433                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 434                 if (errno)
 435                         goto err;
 436         } else {
 437                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 438                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 439         }
 440
 441         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 442                 double time = parse_leasetime(c);
 443                 if (time < 0)
 444                         goto err;
 445
 446                 l->leasetime = time;
 447         }
 448
 449         INIT_LIST_HEAD(&l->assignments);
 450         vlist_add(&leases, &l->node, l);
 451         return 0;
 452
 453 err:
 454         if (l)
 455                 free_lease(l);
 456
 457         return -1;
 458 }
 459
 460 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 461 {
 462         struct interface *iface;
 463         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 464         bool get_addrs = false;
 465
 466         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 467
 468         if (tb[IFACE_ATTR_INTERFACE])
 469                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 470
 471         if (!name)
 472                 return -1;
 473
 474         iface = avl_find_element(&interfaces, name, iface, avl);
 475         if (!iface) {
 476                 char *new_name;
 477
 478                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 479                 if (!iface)
 480                         return -1;
 481
 482                 iface->name = strcpy(new_name, name);
 483                 iface->avl.key = iface->name;
 484                 iface->router_event.uloop.fd = -1;
 485                 iface->dhcpv6_event.uloop.fd = -1;
 486                 iface->ndp_event.uloop.fd = -1;
 487                 iface->ndp_ping_fd = -1;
 488                 iface->dhcpv4_event.uloop.fd = -1;
 489                 INIT_LIST_HEAD(&iface->ia_assignments);
 490                 INIT_LIST_HEAD(&iface->dhcpv4_assignments);
 491                 INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
 492
 493                 set_interface_defaults(iface);
 494
 495                 avl_insert(&interfaces, &iface->avl);
 496                 get_addrs = overwrite = true;
 497         }
 498
 499         const char *ifname = NULL;
 500         if (overwrite) {
 501                 if ((c = tb[IFACE_ATTR_IFNAME]))
 502                         ifname = blobmsg_get_string(c);
 503                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 504                         ifname = blobmsg_get_string(c);
 505         }
 506
 507 #ifdef WITH_UBUS
 508         if (overwrite || !iface->ifname)
 509                 ifname = ubus_get_ifname(name);
 510 #endif
 511
 512         if (!iface->ifname && !ifname)
 513                 goto err;
 514
 515         if (ifname) {
 516                 free(iface->ifname);
 517                 iface->ifname = strdup(ifname);
 518
 519                 if (!iface->ifname)
 520                         goto err;
 521
 522                 if (!iface->ifindex &&
 523                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 524                         goto err;
 525         }
 526
 527         if (get_addrs) {
 528                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 529                                                 true, &iface->addr6);
 530
 531                 if (len > 0)
 532                         iface->addr6_len = len;
 533
 534                 len = netlink_get_interface_addrs(iface->ifindex,
 535                                                 false, &iface->addr4);
 536                 if (len > 0)
 537                         iface->addr4_len = len;
 538         }
 539
 540         iface->inuse = true;
 541
 542         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 543                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 544
 545         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 546                 double time = parse_leasetime(c);
 547                 if (time < 0)
 548                         goto err;
 549
 550                 iface->dhcp_leasetime = time;
 551         }
 552
 553         if ((c = tb[IFACE_ATTR_START])) {
 554                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 555                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 556                                                         LIMIT_DEFAULT - 1);
 557
 558                 if (config.main_dhcpv4 && config.legacy)
 559                         iface->dhcpv4 = MODE_SERVER;
 560         }
 561
 562         if ((c = tb[IFACE_ATTR_LIMIT]))
 563                 iface->dhcpv4_end.s_addr = htonl(ntohl(iface->dhcpv4_start.s_addr) +
 564                                                         blobmsg_get_u32(c) - 1);
 565
 566         if ((c = tb[IFACE_ATTR_MASTER]))
 567                 iface->master = blobmsg_get_bool(c);
 568
 569         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 570                 struct blob_attr *cur;
 571                 unsigned rem;
 572
 573                 blobmsg_for_each_attr(cur, c, rem) {
 574                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 575                                 continue;
 576
 577                         iface->upstream = realloc(iface->upstream,
 578                                         iface->upstream_len + blobmsg_data_len(cur));
 579                         if (!iface->upstream)
 580                                 goto err;
 581
 582                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 583                         iface->upstream_len += blobmsg_data_len(cur);
 584                 }
 585         }
 586
 587         int mode;
 588         if ((c = tb[IFACE_ATTR_RA])) {
 589                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 590                         iface->ra = mode;
 591
 592                         if (iface->ra != MODE_DISABLED)
 593                                 iface->ignore = false;
 594                 } else
 595                         goto err;
 596         }
 597
 598         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 599                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 600                         if (config.main_dhcpv4) {
 601                                 iface->dhcpv4 = mode;
 602
 603                                 if (iface->dhcpv4 != MODE_DISABLED)
 604                                         iface->ignore = false;
 605                         }
 606                 }
 607                 else
 608                         goto err;
 609         }
 610
 611         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 612                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 613                         iface->dhcpv6 = mode;
 614
 615                         if (iface->dhcpv6 != MODE_DISABLED)
 616                                 iface->ignore = false;
 617                 } else
 618                         goto err;
 619         }
 620
 621         if ((c = tb[IFACE_ATTR_NDP])) {
 622                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 623                         iface->ndp = mode;
 624
 625                         if (iface->ndp != MODE_DISABLED)
 626                                 iface->ignore = false;
 627                 } else
 628                         goto err;
 629         }
 630
 631         if ((c = tb[IFACE_ATTR_ROUTER])) {
 632                 struct blob_attr *cur;
 633                 unsigned rem;
 634
 635                 blobmsg_for_each_attr(cur, c, rem) {
 636                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 637                                 continue;
 638
 639                         struct in_addr addr4;
 640                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 641                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 642                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 643                                 if (!iface->dhcpv4_router)
 644                                         goto err;
 645
 646                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 647                         } else
 648                                 goto err;
 649                 }
 650         }
 651
 652         if ((c = tb[IFACE_ATTR_DNS])) {
 653                 struct blob_attr *cur;
 654                 unsigned rem;
 655
 656                 iface->always_rewrite_dns = true;
 657                 blobmsg_for_each_attr(cur, c, rem) {
 658                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 659                                 continue;
 660
 661                         struct in_addr addr4;
 662                         struct in6_addr addr6;
 663                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 664                                 if (addr4.s_addr == INADDR_ANY)
 665                                         goto err;
 666
 667                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 668                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 669                                 if (!iface->dhcpv4_dns)
 670                                         goto err;
 671
 672                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 673                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 674                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 675                                         goto err;
 676
 677                                 iface->dns = realloc(iface->dns,
 678                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 679                                 if (!iface->dns)
 680                                         goto err;
 681
 682                                 iface->dns[iface->dns_cnt - 1] = addr6;
 683                         } else
 684                                 goto err;
 685                 }
 686         }
 687
 688         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 689                 struct blob_attr *cur;
 690                 unsigned rem;
 691
 692                 blobmsg_for_each_attr(cur, c, rem) {
 693                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 694                                 continue;
 695
 696                         uint8_t buf[256];
 697                         char *domain = blobmsg_get_string(cur);
 698                         size_t domainlen = strlen(domain);
 699                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 700                                 domain[domainlen - 1] = 0;
 701
 702                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 703                         if (len <= 0)
 704                                 goto err;
 705
 706                         iface->search = realloc(iface->search, iface->search_len + len);
 707                         if (!iface->search)
 708                                 goto err;
 709
 710                         memcpy(&iface->search[iface->search_len], buf, len);
 711                         iface->search_len += len;
 712                 }
 713         }
 714
 715         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 716                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 717                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 718         }
 719
 720         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 721                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 722
 723         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 724                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 725                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 726                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 727         }
 728
 729         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 730                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 731
 732         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 733                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 734
 735         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 736                 iface->dhcpv6_na = blobmsg_get_bool(c);
 737
 738         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 739                 iface->default_router = blobmsg_get_u32(c);
 740
 741         if (!tb[IFACE_ATTR_RA_FLAGS] && !tb[IFACE_ATTR_RA_SLAAC] &&
 742             (c = tb[IFACE_ATTR_RA_MANAGEMENT])) {
 743                 switch (blobmsg_get_u32(c)) {
 744                 case 0:
 745                         iface->ra_flags = ND_RA_FLAG_OTHER;
 746                         iface->ra_slaac = true;
 747                         break;
 748                 case 1:
 749                         iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
 750                         iface->ra_slaac = true;
 751                         break;
 752                 case 2:
 753                         iface->ra_flags = ND_RA_FLAG_OTHER|ND_RA_FLAG_MANAGED;
 754                         iface->ra_slaac = false;
 755                         break;
 756                 default:
 757                         break;
 758                 }
 759         }
 760
 761         if ((c = tb[IFACE_ATTR_RA_FLAGS])) {
 762                 iface->ra_flags = 0;
 763                 if (parse_ra_flags(&iface->ra_flags, c) < 0)
 764                         goto err;
 765         }
 766
 767         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 768                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 769                 if (ra_reachabletime > 3600000)
 770                         goto err;
 771
 772                 iface->ra_reachabletime = ra_reachabletime;
 773         }
 774
 775         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 776                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 777                 if (ra_retranstime > 60000)
 778                         goto err;
 779
 780                 iface->ra_retranstime = ra_retranstime;
 781         }
 782
 783         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 784                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 785                 if (ra_hoplimit > 255)
 786                         goto err;
 787
 788                 iface->ra_hoplimit = ra_hoplimit;
 789         }
 790
 791         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 792                 uint32_t ra_mtu = blobmsg_get_u32(c);
 793                 if (ra_mtu < 1280 || ra_mtu > 65535)
 794                         goto err;
 795
 796                 iface->ra_mtu = ra_mtu;
 797         }
 798
 799         if ((c = tb[IFACE_ATTR_RA_SLAAC]))
 800                 iface->ra_slaac = blobmsg_get_bool(c);
 801
 802         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 803                 iface->ra_not_onlink = blobmsg_get_bool(c);
 804
 805         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 806                 iface->ra_advrouter = blobmsg_get_bool(c);
 807
 808         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 809                 iface->ra_mininterval =  blobmsg_get_u32(c);
 810
 811         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 812                 iface->ra_maxinterval = blobmsg_get_u32(c);
 813
 814         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 815                 iface->ra_lifetime = blobmsg_get_u32(c);
 816
 817         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 818                 iface->ra_useleasetime = blobmsg_get_bool(c);
 819
 820         if ((c = tb[IFACE_ATTR_RA_DNS]))
 821                 iface->ra_dns = blobmsg_get_bool(c);
 822
 823         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 824                 const char *prio = blobmsg_get_string(c);
 825
 826                 if (!strcmp(prio, "high"))
 827                         iface->route_preference = 1;
 828                 else if (!strcmp(prio, "low"))
 829                         iface->route_preference = -1;
 830                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 831                         iface->route_preference = 0;
 832                 else
 833                         goto err;
 834         }
 835
 836         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 837                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 838                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 839
 840         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 841                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 842                 goto err;
 843
 844         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 845                 iface->learn_routes = blobmsg_get_bool(c);
 846
 847         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 848                 iface->external = blobmsg_get_bool(c);
 849
 850         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 851                 const char *str = blobmsg_get_string(c);
 852                 char *astr = malloc(strlen(str) + 1);
 853                 char *delim;
 854                 int l;
 855
 856                 if (!astr || !strcpy(astr, str) ||
 857                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 858                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 859                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 860                         iface->pio_filter_length = 0;
 861                 else
 862                         iface->pio_filter_length = l;
 863
 864                 if (astr)
 865                         free(astr);
 866         }
 867
 868         return 0;
 869
 870 err:
 871         close_interface(iface);
 872         return -1;
 873 }
 874
 875 static int set_interface(struct uci_section *s)
 876 {
 877         blob_buf_init(&b, 0);
 878         uci_to_blob(&b, s, &interface_attr_list);
 879
 880         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 881 }
 882
 883 static void lease_delete_assignments(struct lease *l, bool v6)
 884 {
 885         struct dhcp_assignment *a, *tmp;
 886         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 887
 888         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 889                 if (a->flags & flag)
 890                         free_assignment(a);
 891         }
 892 }
 893
 894 static void lease_update_assignments(struct lease *l)
 895 {
 896         struct dhcp_assignment *a;
 897
 898         list_for_each_entry(a, &l->assignments, lease_list) {
 899                 if (a->hostname)
 900                         free(a->hostname);
 901                 a->hostname = NULL;
 902
 903                 if (l->hostname)
 904                         a->hostname = strdup(l->hostname);
 905
 906                 a->leasetime = l->leasetime;
 907         }
 908 }
 909
 910 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 911 {
 912         const struct lease *l1 = k1, *l2 = k2;
 913         int cmp = 0;
 914
 915         if (l1->duid_len != l2->duid_len)
 916                 return l1->duid_len - l2->duid_len;
 917
 918         if (l1->duid_len && l2->duid_len)
 919                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 920
 921         if (cmp)
 922                 return cmp;
 923
 924         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 925                       sizeof(l1->mac.ether_addr_octet));
 926 }
 927
 928 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 929 {
 930         bool update = false;
 931
 932         if ((!!l_new->hostname != !!l_old->hostname) ||
 933             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 934                 free(l_old->hostname);
 935                 l_old->hostname = NULL;
 936
 937                 if (l_new->hostname)
 938                         l_old->hostname = strdup(l_new->hostname);
 939
 940                 update = true;
 941         }
 942
 943         if (l_old->leasetime != l_new->leasetime) {
 944                 l_old->leasetime = l_new->leasetime;
 945                 update = true;
 946         }
 947
 948         if (l_old->ipaddr != l_new->ipaddr) {
 949                 l_old->ipaddr = l_new->ipaddr;
 950                 lease_delete_assignments(l_old, false);
 951         }
 952
 953         if (l_old->hostid != l_new->hostid) {
 954                 l_old->hostid = l_new->hostid;
 955                 lease_delete_assignments(l_old, true);
 956         }
 957
 958         if (update)
 959                 lease_update_assignments(l_old);
 960
 961         free_lease(l_new);
 962 }
 963
 964 static void lease_delete(struct lease *l)
 965 {
 966         struct dhcp_assignment *a, *tmp;
 967
 968         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list)
 969                 free_assignment(a);
 970
 971         free_lease(l);
 972 }
 973
 974 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 975                          struct vlist_node *node_old)
 976 {
 977         struct lease *lease_new = container_of(node_new, struct lease, node);
 978         struct lease *lease_old = container_of(node_old, struct lease, node);
 979
 980         if (node_old && node_new)
 981                 lease_change_config(lease_old, lease_new);
 982         else if (node_old)
 983                 lease_delete(lease_old);
 984 }
 985
 986 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 987 {
 988         struct lease *l;
 989
 990         vlist_for_each_element(&leases, l, node) {
 991                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 992                         return l;
 993         }
 994
 995         return NULL;
 996 }
 997
 998 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 999 {
1000         struct lease *l;
1001
1002         vlist_for_each_element(&leases, l, node) {
1003                 if (!memcmp(l->mac.ether_addr_octet, mac,
1004                             sizeof(l->mac.ether_addr_octet)))
1005                         return l;
1006         }
1007
1008         return NULL;
1009 }
1010
1011 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
1012 {
1013         struct lease *l;
1014
1015         vlist_for_each_element(&leases, l, node) {
1016                 if (l->hostid == hostid)
1017                         return l;
1018         }
1019
1020         return NULL;
1021 }
1022
1023 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
1024 {
1025         struct lease *l;
1026
1027         vlist_for_each_element(&leases, l, node) {
1028                 if (l->ipaddr == ipaddr)
1029                         return l;
1030         }
1031
1032         return NULL;
1033 }
1034
1035 void odhcpd_reload(void)
1036 {
1037         struct uci_context *uci = uci_alloc_context();
1038         struct interface *master = NULL, *i, *tmp;
1039
1040         if (!uci)
1041                 return;
1042
1043         vlist_update(&leases);
1044         avl_for_each_element(&interfaces, i, avl)
1045                 clean_interface(i);
1046
1047         struct uci_package *dhcp = NULL;
1048         if (!uci_load(uci, "dhcp", &dhcp)) {
1049                 struct uci_element *e;
1050
1051                 /* 1. Global settings */
1052                 uci_foreach_element(&dhcp->sections, e) {
1053                         struct uci_section *s = uci_to_section(e);
1054                         if (!strcmp(s->type, "odhcpd"))
1055                                 set_config(s);
1056                 }
1057
1058                 /* 2. DHCP pools */
1059                 uci_foreach_element(&dhcp->sections, e) {
1060                         struct uci_section *s = uci_to_section(e);
1061                         if (!strcmp(s->type, "dhcp"))
1062                                 set_interface(s);
1063                 }
1064
1065                 /* 3. Static leases */
1066                 uci_foreach_element(&dhcp->sections, e) {
1067                         struct uci_section* s = uci_to_section(e);
1068                         if (!strcmp(s->type, "host"))
1069                                 set_lease(s);
1070                 }
1071         }
1072
1073         if (config.dhcp_statefile) {
1074                 char *path = strdup(config.dhcp_statefile);
1075
1076                 mkdir_p(dirname(path), 0755);
1077                 free(path);
1078         }
1079
1080         vlist_flush(&leases);
1081
1082 #ifdef WITH_UBUS
1083         ubus_apply_network();
1084 #endif
1085
1086         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
1087
1088         /* Test for */
1089         avl_for_each_element(&interfaces, i, avl) {
1090                 if (i->master)
1091                         continue;
1092
1093                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
1094                         any_dhcpv6_slave = true;
1095
1096                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
1097                         any_ra_slave = true;
1098
1099                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
1100                         any_ndp_slave = true;
1101         }
1102
1103         /* Evaluate hybrid mode for master */
1104         avl_for_each_element(&interfaces, i, avl) {
1105                 if (!i->master)
1106                         continue;
1107
1108                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1109 #ifdef WITH_UBUS
1110                 if (!ubus_has_prefix(i->name, i->ifname))
1111                         hybrid_mode = MODE_RELAY;
1112 #endif
1113
1114                 if (i->dhcpv6 == MODE_HYBRID)
1115                         i->dhcpv6 = hybrid_mode;
1116
1117                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1118                         i->dhcpv6 = MODE_DISABLED;
1119
1120                 if (i->ra == MODE_HYBRID)
1121                         i->ra = hybrid_mode;
1122
1123                 if (i->ra == MODE_RELAY && !any_ra_slave)
1124                         i->ra = MODE_DISABLED;
1125
1126                 if (i->ndp == MODE_HYBRID)
1127                         i->ndp = hybrid_mode;
1128
1129                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1130                         i->ndp = MODE_DISABLED;
1131
1132                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1133                         master = i;
1134         }
1135
1136
1137         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1138                 if (i->inuse) {
1139                         /* Resolve hybrid mode */
1140                         if (i->dhcpv6 == MODE_HYBRID)
1141                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1142                                                 MODE_RELAY : MODE_SERVER;
1143
1144                         if (i->ra == MODE_HYBRID)
1145                                 i->ra = (master && master->ra == MODE_RELAY) ?
1146                                                 MODE_RELAY : MODE_SERVER;
1147
1148                         if (i->ndp == MODE_HYBRID)
1149                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1150                                                 MODE_RELAY : MODE_DISABLED;
1151
1152                         router_setup_interface(i, i->ra != MODE_DISABLED);
1153                         dhcpv6_setup_interface(i, i->dhcpv6 != MODE_DISABLED);
1154                         ndp_setup_interface(i, i->ndp != MODE_DISABLED);
1155 #ifdef DHCPV4_SUPPORT
1156                         dhcpv4_setup_interface(i, i->dhcpv4 != MODE_DISABLED);
1157 #endif
1158                 } else
1159                         close_interface(i);
1160         }
1161
1162         uci_unload(uci, dhcp);
1163         uci_free_context(uci);
1164 }
1165
1166 static void handle_signal(int signal)
1167 {
1168         char b[1] = {0};
1169
1170         if (signal == SIGHUP) {
1171                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1172         } else
1173                 uloop_end();
1174 }
1175
1176 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1177 {
1178         char b[512];
1179         if (read(u->fd, b, sizeof(b)) < 0) {}
1180
1181         odhcpd_reload();
1182 }
1183
1184 static struct uloop_fd reload_fd = { .fd = -1, .cb = reload_cb };
1185
1186 void odhcpd_run(void)
1187 {
1188         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1189
1190         reload_fd.fd = reload_pipe[0];
1191         uloop_fd_add(&reload_fd, ULOOP_READ);
1192
1193         signal(SIGTERM, handle_signal);
1194         signal(SIGINT, handle_signal);
1195         signal(SIGHUP, handle_signal);
1196
1197 #ifdef WITH_UBUS
1198         while (ubus_init())
1199                 sleep(1);
1200 #endif
1201
1202         odhcpd_reload();
1203         uloop_run();
1204 }