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
  16 #include "odhcpd.h"
  17
  18 static struct blob_buf b;
  19 static int reload_pipe[2];
  20 struct list_head leases = LIST_HEAD_INIT(leases);
  21 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  22 struct config config = {.legacy = false, .main_dhcpv4 = false,
  23                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  24                         .log_level = LOG_INFO};
  25
  26 enum {
  27         IFACE_ATTR_INTERFACE,
  28         IFACE_ATTR_IFNAME,
  29         IFACE_ATTR_NETWORKID,
  30         IFACE_ATTR_DYNAMICDHCP,
  31         IFACE_ATTR_IGNORE,
  32         IFACE_ATTR_LEASETIME,
  33         IFACE_ATTR_LIMIT,
  34         IFACE_ATTR_START,
  35         IFACE_ATTR_MASTER,
  36         IFACE_ATTR_UPSTREAM,
  37         IFACE_ATTR_RA,
  38         IFACE_ATTR_DHCPV4,
  39         IFACE_ATTR_DHCPV6,
  40         IFACE_ATTR_NDP,
  41         IFACE_ATTR_ROUTER,
  42         IFACE_ATTR_DNS,
  43         IFACE_ATTR_DOMAIN,
  44         IFACE_ATTR_FILTER_CLASS,
  45         IFACE_ATTR_DHCPV4_FORCERECONF,
  46         IFACE_ATTR_DHCPV6_RAW,
  47         IFACE_ATTR_DHCPV6_ASSIGNALL,
  48         IFACE_ATTR_RA_DEFAULT,
  49         IFACE_ATTR_RA_MANAGEMENT,
  50         IFACE_ATTR_RA_OFFLINK,
  51         IFACE_ATTR_RA_PREFERENCE,
  52         IFACE_ATTR_RA_ADVROUTER,
  53         IFACE_ATTR_RA_MININTERVAL,
  54         IFACE_ATTR_RA_MAXINTERVAL,
  55         IFACE_ATTR_RA_LIFETIME,
  56         IFACE_ATTR_RA_USELEASETIME,
  57         IFACE_ATTR_RA_REACHABLETIME,
  58         IFACE_ATTR_RA_RETRANSTIME,
  59         IFACE_ATTR_RA_HOPLIMIT,
  60         IFACE_ATTR_RA_MTU,
  61         IFACE_ATTR_PD_MANAGER,
  62         IFACE_ATTR_PD_CER,
  63         IFACE_ATTR_NDPROXY_ROUTING,
  64         IFACE_ATTR_NDPROXY_SLAVE,
  65         IFACE_ATTR_PREFIX_FILTER,
  66         IFACE_ATTR_MAX
  67 };
  68
  69 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  70         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  72         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  73         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  74         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  75         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  77         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  78         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  79         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  80         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  81         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  85         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  86         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  87         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
  89         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  90         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  92         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  94         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  96         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  97         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  98         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  99         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 100         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 101         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 102         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 103         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 104         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 105         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 106         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 107         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 108         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 109 };
 110
 111 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 112         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 113         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 114         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 115 };
 116
 117 const struct uci_blob_param_list interface_attr_list = {
 118         .n_params = IFACE_ATTR_MAX,
 119         .params = iface_attrs,
 120         .info = iface_attr_info,
 121 };
 122
 123 enum {
 124         LEASE_ATTR_IP,
 125         LEASE_ATTR_MAC,
 126         LEASE_ATTR_DUID,
 127         LEASE_ATTR_HOSTID,
 128         LEASE_ATTR_LEASETIME,
 129         LEASE_ATTR_NAME,
 130         LEASE_ATTR_MAX
 131 };
 132
 133 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 134         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 135         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 136         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 137         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 138         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 139         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 140 };
 141
 142 const struct uci_blob_param_list lease_attr_list = {
 143         .n_params = LEASE_ATTR_MAX,
 144         .params = lease_attrs,
 145 };
 146
 147 enum {
 148         ODHCPD_ATTR_LEGACY,
 149         ODHCPD_ATTR_MAINDHCP,
 150         ODHCPD_ATTR_LEASEFILE,
 151         ODHCPD_ATTR_LEASETRIGGER,
 152         ODHCPD_ATTR_LOGLEVEL,
 153         ODHCPD_ATTR_MAX
 154 };
 155
 156 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 157         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 158         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 159         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 160         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 161         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 162 };
 163
 164 const struct uci_blob_param_list odhcpd_attr_list = {
 165         .n_params = ODHCPD_ATTR_MAX,
 166         .params = odhcpd_attrs,
 167 };
 168
 169 static int mkdir_p(char *dir, mode_t mask)
 170 {
 171         char *l = strrchr(dir, '/');
 172         int ret;
 173
 174         if (!l)
 175                 return 0;
 176
 177         *l = '\0';
 178
 179         if (mkdir_p(dir, mask))
 180                 return -1;
 181
 182         *l = '/';
 183
 184         ret = mkdir(dir, mask);
 185         if (ret && errno == EEXIST)
 186                 return 0;
 187
 188         if (ret)
 189                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 190
 191         return ret;
 192 }
 193
 194 static void free_lease(struct lease *l)
 195 {
 196         if (l->head.next)
 197                 list_del(&l->head);
 198
 199         free(l->duid);
 200         free(l);
 201 }
 202
 203 static struct interface* get_interface(const char *name)
 204 {
 205         struct interface *c;
 206         list_for_each_entry(c, &interfaces, head)
 207                 if (!strcmp(c->name, name))
 208                         return c;
 209         return NULL;
 210 }
 211
 212 static void set_interface_defaults(struct interface *iface)
 213 {
 214         iface->learn_routes = 1;
 215         iface->dhcpv4_leasetime = 43200;
 216         iface->dhcpv6_assignall = true;
 217         iface->ra_managed = RA_MANAGED_MFLAG;
 218         iface->ra_maxinterval = 600;
 219         iface->ra_mininterval = iface->ra_maxinterval/3;
 220         iface->ra_lifetime = -1;
 221 }
 222
 223 static void clean_interface(struct interface *iface)
 224 {
 225         free(iface->dns);
 226         free(iface->search);
 227         free(iface->upstream);
 228         free(iface->dhcpv4_router);
 229         free(iface->dhcpv4_dns);
 230         free(iface->dhcpv6_raw);
 231         free(iface->filter_class);
 232         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 233         set_interface_defaults(iface);
 234 }
 235
 236 static void close_interface(struct interface *iface)
 237 {
 238         if (iface->head.next)
 239                 list_del(&iface->head);
 240
 241         router_setup_interface(iface, false);
 242         dhcpv6_setup_interface(iface, false);
 243         ndp_setup_interface(iface, false);
 244 #ifdef DHCPV4_SUPPORT
 245         dhcpv4_setup_interface(iface, false);
 246 #endif
 247
 248         clean_interface(iface);
 249         free(iface->addr4);
 250         free(iface->addr6);
 251         free(iface->ifname);
 252         free(iface);
 253 }
 254
 255 static int parse_mode(const char *mode)
 256 {
 257         if (!strcmp(mode, "disabled"))
 258                 return MODE_DISABLED;
 259         else if (!strcmp(mode, "server"))
 260                 return MODE_SERVER;
 261         else if (!strcmp(mode, "relay"))
 262                 return MODE_RELAY;
 263         else if (!strcmp(mode, "hybrid"))
 264                 return MODE_HYBRID;
 265         else
 266                 return -1;
 267 }
 268
 269 static void set_config(struct uci_section *s)
 270 {
 271         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 272
 273         blob_buf_init(&b, 0);
 274         uci_to_blob(&b, s, &odhcpd_attr_list);
 275         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 276
 277         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 278                 config.legacy = blobmsg_get_bool(c);
 279
 280         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 281                 config.main_dhcpv4 = blobmsg_get_bool(c);
 282
 283         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 284                 free(config.dhcp_statefile);
 285                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 286         }
 287
 288         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 289                 free(config.dhcp_cb);
 290                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 291         }
 292
 293         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 294                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 295
 296                 if (config.log_level != log_level) {
 297                         config.log_level = log_level;
 298                         setlogmask(LOG_UPTO(config.log_level));
 299                 }
 300         }
 301 }
 302
 303 static double parse_leasetime(struct blob_attr *c) {
 304         char *val = blobmsg_get_string(c), *endptr = NULL;
 305         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 306
 307         if (time && endptr && endptr[0]) {
 308                 if (endptr[0] == 's')
 309                         time *= 1;
 310                 else if (endptr[0] == 'm')
 311                         time *= 60;
 312                 else if (endptr[0] == 'h')
 313                         time *= 3600;
 314                 else if (endptr[0] == 'd')
 315                         time *= 24 * 3600;
 316                 else if (endptr[0] == 'w')
 317                         time *= 7 * 24 * 3600;
 318                 else
 319                         goto err;
 320         }
 321
 322         if (time < 60)
 323                 time = 60;
 324
 325         return time;
 326
 327 err:
 328         return -1;
 329 }
 330
 331 static int set_lease(struct uci_section *s)
 332 {
 333         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 334
 335         blob_buf_init(&b, 0);
 336         uci_to_blob(&b, s, &lease_attr_list);
 337         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 338
 339         size_t hostlen = 1;
 340         if ((c = tb[LEASE_ATTR_NAME]))
 341                 hostlen = blobmsg_data_len(c);
 342
 343         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 344         if (!lease)
 345                 goto err;
 346
 347         if (hostlen > 1) {
 348                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 349                 if (!odhcpd_valid_hostname(lease->hostname))
 350                         goto err;
 351         }
 352
 353         if ((c = tb[LEASE_ATTR_IP]))
 354                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 355                         goto err;
 356
 357         if ((c = tb[LEASE_ATTR_MAC]))
 358                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 359                         goto err;
 360
 361         if ((c = tb[LEASE_ATTR_DUID])) {
 362                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 363                 lease->duid = malloc(duidlen);
 364                 if (!lease->duid)
 365                         goto err;
 366
 367                 ssize_t len = odhcpd_unhexlify(lease->duid,
 368                                 duidlen, blobmsg_get_string(c));
 369
 370                 if (len < 0)
 371                         goto err;
 372
 373                 lease->duid_len = len;
 374         }
 375
 376         if ((c = tb[LEASE_ATTR_HOSTID])) {
 377                 errno = 0;
 378                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 379                 if (errno)
 380                         goto err;
 381         }
 382
 383         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 384                 double time = parse_leasetime(c);
 385                 if (time < 0)
 386                         goto err;
 387
 388                 lease->dhcpv4_leasetime = time;
 389         }
 390
 391         list_add(&lease->head, &leases);
 392         return 0;
 393
 394 err:
 395         if (lease)
 396                 free_lease(lease);
 397
 398         return -1;
 399 }
 400
 401 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 402 {
 403         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 404         bool get_addrs = false;
 405
 406         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 407
 408         if (tb[IFACE_ATTR_INTERFACE])
 409                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 410
 411         if (!name)
 412                 return -1;
 413
 414         struct interface *iface = get_interface(name);
 415         if (!iface) {
 416                 char *iface_name;
 417
 418                 iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 419                 if (!iface)
 420                         return -1;
 421
 422                 iface->name = strcpy(iface_name, name);
 423
 424                 set_interface_defaults(iface);
 425
 426                 list_add(&iface->head, &interfaces);
 427                 get_addrs = overwrite = true;
 428         }
 429
 430         const char *ifname = NULL;
 431         if (overwrite) {
 432                 if ((c = tb[IFACE_ATTR_IFNAME]))
 433                         ifname = blobmsg_get_string(c);
 434                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 435                         ifname = blobmsg_get_string(c);
 436         }
 437
 438 #ifdef WITH_UBUS
 439         if (overwrite || !iface->ifname)
 440                 ifname = ubus_get_ifname(name);
 441 #endif
 442
 443         if (!iface->ifname && !ifname)
 444                 goto err;
 445
 446         if (ifname) {
 447                 free(iface->ifname);
 448                 iface->ifname = strdup(ifname);
 449
 450                 if (!iface->ifname)
 451                         goto err;
 452
 453                 if (!iface->ifindex &&
 454                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 455                         goto err;
 456         }
 457
 458         if (get_addrs) {
 459                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 460                                                 true, &iface->addr6);
 461
 462                 if (len > 0)
 463                         iface->addr6_len = len;
 464
 465                 len = netlink_get_interface_addrs(iface->ifindex,
 466                                                 false, &iface->addr4);
 467                 if (len > 0)
 468                         iface->addr4_len = len;
 469         }
 470
 471         iface->inuse = true;
 472
 473         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 474                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 475
 476         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 477                 iface->ignore = blobmsg_get_bool(c);
 478
 479         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 480                 double time = parse_leasetime(c);
 481                 if (time < 0)
 482                         goto err;
 483
 484                 iface->dhcpv4_leasetime = time;
 485         }
 486
 487         if ((c = tb[IFACE_ATTR_START])) {
 488                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 489
 490                 if (config.main_dhcpv4 && config.legacy)
 491                         iface->dhcpv4 = MODE_SERVER;
 492         }
 493
 494         if ((c = tb[IFACE_ATTR_LIMIT]))
 495                 iface->dhcpv4_end.s_addr = htonl(
 496                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 497
 498         if ((c = tb[IFACE_ATTR_MASTER]))
 499                 iface->master = blobmsg_get_bool(c);
 500
 501         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 502                 struct blob_attr *cur;
 503                 unsigned rem;
 504
 505                 blobmsg_for_each_attr(cur, c, rem) {
 506                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 507                                 continue;
 508
 509                         iface->upstream = realloc(iface->upstream,
 510                                         iface->upstream_len + blobmsg_data_len(cur));
 511                         if (!iface->upstream)
 512                                 goto err;
 513
 514                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 515                         iface->upstream_len += blobmsg_data_len(cur);
 516                 }
 517         }
 518
 519         int mode;
 520         if ((c = tb[IFACE_ATTR_RA])) {
 521                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 522                         iface->ra = mode;
 523                 else
 524                         goto err;
 525         }
 526
 527         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 528                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 529                         if (config.main_dhcpv4)
 530                                 iface->dhcpv4 = mode;
 531                 }
 532                 else
 533                         goto err;
 534         }
 535
 536         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 537                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 538                         iface->dhcpv6 = mode;
 539                 else
 540                         goto err;
 541         }
 542
 543         if ((c = tb[IFACE_ATTR_NDP])) {
 544                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 545                         iface->ndp = mode;
 546                 else
 547                         goto err;
 548         }
 549
 550         if ((c = tb[IFACE_ATTR_ROUTER])) {
 551                 struct blob_attr *cur;
 552                 unsigned rem;
 553
 554                 blobmsg_for_each_attr(cur, c, rem) {
 555                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 556                                 continue;
 557
 558                         struct in_addr addr4;
 559                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 560                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 561                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 562                                 if (!iface->dhcpv4_router)
 563                                         goto err;
 564
 565                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 566                         } else
 567                                 goto err;
 568                 }
 569         }
 570
 571         if ((c = tb[IFACE_ATTR_DNS])) {
 572                 struct blob_attr *cur;
 573                 unsigned rem;
 574
 575                 iface->always_rewrite_dns = true;
 576                 blobmsg_for_each_attr(cur, c, rem) {
 577                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 578                                 continue;
 579
 580                         struct in_addr addr4;
 581                         struct in6_addr addr6;
 582                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 583                                 if (addr4.s_addr == INADDR_ANY)
 584                                         goto err;
 585
 586                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 587                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 588                                 if (!iface->dhcpv4_dns)
 589                                         goto err;
 590
 591                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 592                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 593                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 594                                         goto err;
 595
 596                                 iface->dns = realloc(iface->dns,
 597                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 598                                 if (!iface->dns)
 599                                         goto err;
 600
 601                                 iface->dns[iface->dns_cnt - 1] = addr6;
 602                         } else
 603                                 goto err;
 604                 }
 605         }
 606
 607         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 608                 struct blob_attr *cur;
 609                 unsigned rem;
 610
 611                 blobmsg_for_each_attr(cur, c, rem) {
 612                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 613                                 continue;
 614
 615                         uint8_t buf[256];
 616                         char *domain = blobmsg_get_string(cur);
 617                         size_t domainlen = strlen(domain);
 618                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 619                                 domain[domainlen - 1] = 0;
 620
 621                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 622                         if (len <= 0)
 623                                 goto err;
 624
 625                         iface->search = realloc(iface->search, iface->search_len + len);
 626                         if (!iface->search)
 627                                 goto err;
 628
 629                         memcpy(&iface->search[iface->search_len], buf, len);
 630                         iface->search_len += len;
 631                 }
 632         }
 633
 634         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 635                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 636                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 637         }
 638
 639         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 640                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 641
 642         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 643                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 644                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 645                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 646         }
 647
 648         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 649                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 650
 651         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 652                 iface->default_router = blobmsg_get_u32(c);
 653
 654         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 655                 iface->ra_managed = blobmsg_get_u32(c);
 656
 657         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 658                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 659                 if (ra_reachabletime > 3600000)
 660                         goto err;
 661
 662                 iface->ra_reachabletime = ra_reachabletime;
 663         }
 664
 665         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 666                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 667                 if (ra_retranstime > 60000)
 668                         goto err;
 669
 670                 iface->ra_retranstime = ra_retranstime;
 671         }
 672
 673         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 674                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 675                 if (ra_hoplimit > 255)
 676                         goto err;
 677
 678                 iface->ra_hoplimit = ra_hoplimit;
 679         }
 680
 681         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 682                 uint32_t ra_mtu = blobmsg_get_u32(c);
 683                 if (ra_mtu < 1280 || ra_mtu > 65535)
 684                         goto err;
 685
 686                 iface->ra_mtu = ra_mtu;
 687         }
 688
 689         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 690                 iface->ra_not_onlink = blobmsg_get_bool(c);
 691
 692         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 693                 iface->ra_advrouter = blobmsg_get_bool(c);
 694
 695         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 696                 iface->ra_mininterval =  blobmsg_get_u32(c);
 697
 698         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 699                 iface->ra_maxinterval = blobmsg_get_u32(c);
 700
 701         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 702                 iface->ra_lifetime = blobmsg_get_u32(c);
 703
 704         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 705                 iface->ra_useleasetime = blobmsg_get_bool(c);
 706
 707         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 708                 const char *prio = blobmsg_get_string(c);
 709
 710                 if (!strcmp(prio, "high"))
 711                         iface->route_preference = 1;
 712                 else if (!strcmp(prio, "low"))
 713                         iface->route_preference = -1;
 714                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 715                         iface->route_preference = 0;
 716                 else
 717                         goto err;
 718         }
 719
 720         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 721                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 722                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 723
 724         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 725                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 726                 goto err;
 727
 728         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 729                 iface->learn_routes = blobmsg_get_bool(c);
 730
 731         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 732                 iface->external = blobmsg_get_bool(c);
 733
 734         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 735                 const char *str = blobmsg_get_string(c);
 736                 char *astr = malloc(strlen(str) + 1);
 737                 char *delim;
 738                 int l;
 739
 740                 if (!astr || !strcpy(astr, str) ||
 741                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 742                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 743                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 744                         iface->pio_filter_length = 0;
 745                 else
 746                         iface->pio_filter_length = l;
 747
 748                 if (astr)
 749                         free(astr);
 750         }
 751
 752         return 0;
 753
 754 err:
 755         close_interface(iface);
 756         return -1;
 757 }
 758
 759 static int set_interface(struct uci_section *s)
 760 {
 761         blob_buf_init(&b, 0);
 762         uci_to_blob(&b, s, &interface_attr_list);
 763
 764         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 765 }
 766
 767 void odhcpd_reload(void)
 768 {
 769         struct uci_context *uci = uci_alloc_context();
 770
 771         while (!list_empty(&leases))
 772                 free_lease(list_first_entry(&leases, struct lease, head));
 773
 774         struct interface *master = NULL, *i, *n;
 775
 776         if (!uci)
 777                 return;
 778
 779         list_for_each_entry(i, &interfaces, head)
 780                 clean_interface(i);
 781
 782         struct uci_package *dhcp = NULL;
 783         if (!uci_load(uci, "dhcp", &dhcp)) {
 784                 struct uci_element *e;
 785                 uci_foreach_element(&dhcp->sections, e) {
 786                         struct uci_section *s = uci_to_section(e);
 787                         if (!strcmp(s->type, "host"))
 788                                 set_lease(s);
 789                         else if (!strcmp(s->type, "odhcpd"))
 790                                 set_config(s);
 791                 }
 792
 793                 uci_foreach_element(&dhcp->sections, e) {
 794                         struct uci_section *s = uci_to_section(e);
 795                         if (!strcmp(s->type, "dhcp"))
 796                                 set_interface(s);
 797                 }
 798         }
 799
 800         if (config.dhcp_statefile) {
 801                 char *path = strdup(config.dhcp_statefile);
 802
 803                 mkdir_p(dirname(path), 0755);
 804                 free(path);
 805         }
 806
 807 #ifdef WITH_UBUS
 808         ubus_apply_network();
 809 #endif
 810
 811         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 812
 813         /* Test for */
 814         list_for_each_entry(i, &interfaces, head) {
 815                 if (i->master)
 816                         continue;
 817
 818                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 819                         any_dhcpv6_slave = true;
 820
 821                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 822                         any_ra_slave = true;
 823
 824                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 825                         any_ndp_slave = true;
 826         }
 827
 828         /* Evaluate hybrid mode for master */
 829         list_for_each_entry(i, &interfaces, head) {
 830                 if (!i->master)
 831                         continue;
 832
 833                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
 834 #ifdef WITH_UBUS
 835                 if (!ubus_has_prefix(i->name, i->ifname))
 836                         hybrid_mode = MODE_RELAY;
 837 #endif
 838
 839                 if (i->dhcpv6 == MODE_HYBRID)
 840                         i->dhcpv6 = hybrid_mode;
 841
 842                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
 843                         i->dhcpv6 = MODE_DISABLED;
 844
 845                 if (i->ra == MODE_HYBRID)
 846                         i->ra = hybrid_mode;
 847
 848                 if (i->ra == MODE_RELAY && !any_ra_slave)
 849                         i->ra = MODE_DISABLED;
 850
 851                 if (i->ndp == MODE_HYBRID)
 852                         i->ndp = hybrid_mode;
 853
 854                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
 855                         i->ndp = MODE_DISABLED;
 856
 857                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
 858                         master = i;
 859         }
 860
 861
 862         list_for_each_entry_safe(i, n, &interfaces, head) {
 863                 if (i->inuse) {
 864                         /* Resolve hybrid mode */
 865                         if (i->dhcpv6 == MODE_HYBRID)
 866                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
 867                                                 MODE_RELAY : MODE_SERVER;
 868
 869                         if (i->ra == MODE_HYBRID)
 870                                 i->ra = (master && master->ra == MODE_RELAY) ?
 871                                                 MODE_RELAY : MODE_SERVER;
 872
 873                         if (i->ndp == MODE_HYBRID)
 874                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
 875                                                 MODE_RELAY : MODE_DISABLED;
 876
 877                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
 878                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
 879                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
 880 #ifdef DHCPV4_SUPPORT
 881                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
 882 #endif
 883                 } else
 884                         close_interface(i);
 885         }
 886
 887         uci_unload(uci, dhcp);
 888         uci_free_context(uci);
 889 }
 890
 891 static void handle_signal(int signal)
 892 {
 893         char b[1] = {0};
 894
 895         if (signal == SIGHUP) {
 896                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 897         } else
 898                 uloop_end();
 899 }
 900
 901 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 902 {
 903         char b[512];
 904         if (read(u->fd, b, sizeof(b)) < 0) {}
 905
 906         odhcpd_reload();
 907 }
 908
 909 static struct uloop_fd reload_fd = { .cb = reload_cb };
 910
 911 void odhcpd_run(void)
 912 {
 913         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 914
 915         reload_fd.fd = reload_pipe[0];
 916         uloop_fd_add(&reload_fd, ULOOP_READ);
 917
 918         signal(SIGTERM, handle_signal);
 919         signal(SIGINT, handle_signal);
 920         signal(SIGHUP, handle_signal);
 921
 922 #ifdef WITH_UBUS
 923         while (ubus_init())
 924                 sleep(1);
 925 #endif
 926
 927         odhcpd_reload();
 928         uloop_run();
 929
 930         while (!list_empty(&interfaces))
 931                 close_interface(list_first_entry(&interfaces, struct interface, head));
 932 }
 933