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];
  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_INFO};
  34
  35 enum {
  36         IFACE_ATTR_INTERFACE,
  37         IFACE_ATTR_IFNAME,
  38         IFACE_ATTR_NETWORKID,
  39         IFACE_ATTR_DYNAMICDHCP,
  40         IFACE_ATTR_IGNORE,
  41         IFACE_ATTR_LEASETIME,
  42         IFACE_ATTR_LIMIT,
  43         IFACE_ATTR_START,
  44         IFACE_ATTR_MASTER,
  45         IFACE_ATTR_UPSTREAM,
  46         IFACE_ATTR_RA,
  47         IFACE_ATTR_DHCPV4,
  48         IFACE_ATTR_DHCPV6,
  49         IFACE_ATTR_NDP,
  50         IFACE_ATTR_ROUTER,
  51         IFACE_ATTR_DNS,
  52         IFACE_ATTR_DOMAIN,
  53         IFACE_ATTR_FILTER_CLASS,
  54         IFACE_ATTR_DHCPV4_FORCERECONF,
  55         IFACE_ATTR_DHCPV6_RAW,
  56         IFACE_ATTR_DHCPV6_ASSIGNALL,
  57         IFACE_ATTR_DHCPV6_PD,
  58         IFACE_ATTR_DHCPV6_NA,
  59         IFACE_ATTR_RA_DEFAULT,
  60         IFACE_ATTR_RA_MANAGEMENT,
  61         IFACE_ATTR_RA_OFFLINK,
  62         IFACE_ATTR_RA_PREFERENCE,
  63         IFACE_ATTR_RA_ADVROUTER,
  64         IFACE_ATTR_RA_MININTERVAL,
  65         IFACE_ATTR_RA_MAXINTERVAL,
  66         IFACE_ATTR_RA_LIFETIME,
  67         IFACE_ATTR_RA_USELEASETIME,
  68         IFACE_ATTR_RA_REACHABLETIME,
  69         IFACE_ATTR_RA_RETRANSTIME,
  70         IFACE_ATTR_RA_HOPLIMIT,
  71         IFACE_ATTR_RA_MTU,
  72         IFACE_ATTR_RA_DNS,
  73         IFACE_ATTR_PD_MANAGER,
  74         IFACE_ATTR_PD_CER,
  75         IFACE_ATTR_NDPROXY_ROUTING,
  76         IFACE_ATTR_NDPROXY_SLAVE,
  77         IFACE_ATTR_PREFIX_FILTER,
  78         IFACE_ATTR_MAX
  79 };
  80
  81 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  82         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  86         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  87         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  88         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  89         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  90         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  91         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  92         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  93         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  94         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  95         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  96         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  97         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  98         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  99         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
 100         [IFACE_ATTR_DHCPV4_FORCERECONF] = { .name = "dhcpv4_forcereconf", .type = BLOBMSG_TYPE_BOOL },
 101         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
 102         [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
 103         [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
 104         [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
 105         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
 106         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
 107         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
 108         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
 109         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
 110         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
 111         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
 112         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
 113         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
 114         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
 115         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
 116         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
 117         [IFACE_ATTR_RA_RETRANSTIME] = { .name = "ra_retranstime", .type = BLOBMSG_TYPE_INT32 },
 118         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
 119         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
 120         [IFACE_ATTR_RA_DNS] = { .name = "ra_dns", .type = BLOBMSG_TYPE_BOOL },
 121         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
 122         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
 123         [IFACE_ATTR_PREFIX_FILTER] = { .name = "prefix_filter", .type = BLOBMSG_TYPE_STRING },
 124 };
 125
 126 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 127         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 128         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 129         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 130 };
 131
 132 const struct uci_blob_param_list interface_attr_list = {
 133         .n_params = IFACE_ATTR_MAX,
 134         .params = iface_attrs,
 135         .info = iface_attr_info,
 136 };
 137
 138 enum {
 139         LEASE_ATTR_IP,
 140         LEASE_ATTR_MAC,
 141         LEASE_ATTR_DUID,
 142         LEASE_ATTR_HOSTID,
 143         LEASE_ATTR_LEASETIME,
 144         LEASE_ATTR_NAME,
 145         LEASE_ATTR_MAX
 146 };
 147
 148 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 149         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 150         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 151         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 152         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 153         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 154         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 155 };
 156
 157 const struct uci_blob_param_list lease_attr_list = {
 158         .n_params = LEASE_ATTR_MAX,
 159         .params = lease_attrs,
 160 };
 161
 162 enum {
 163         ODHCPD_ATTR_LEGACY,
 164         ODHCPD_ATTR_MAINDHCP,
 165         ODHCPD_ATTR_LEASEFILE,
 166         ODHCPD_ATTR_LEASETRIGGER,
 167         ODHCPD_ATTR_LOGLEVEL,
 168         ODHCPD_ATTR_MAX
 169 };
 170
 171 static const struct blobmsg_policy odhcpd_attrs[ODHCPD_ATTR_MAX] = {
 172         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 173         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 174         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 175         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 176         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 177 };
 178
 179 const struct uci_blob_param_list odhcpd_attr_list = {
 180         .n_params = ODHCPD_ATTR_MAX,
 181         .params = odhcpd_attrs,
 182 };
 183
 184 static int mkdir_p(char *dir, mode_t mask)
 185 {
 186         char *l = strrchr(dir, '/');
 187         int ret;
 188
 189         if (!l)
 190                 return 0;
 191
 192         *l = '\0';
 193
 194         if (mkdir_p(dir, mask))
 195                 return -1;
 196
 197         *l = '/';
 198
 199         ret = mkdir(dir, mask);
 200         if (ret && errno == EEXIST)
 201                 return 0;
 202
 203         if (ret)
 204                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %m\n", dir, mask);
 205
 206         return ret;
 207 }
 208
 209 static void set_interface_defaults(struct interface *iface)
 210 {
 211         iface->learn_routes = 1;
 212         iface->dhcpv4_leasetime = 43200;
 213         iface->dhcpv6_assignall = true;
 214         iface->dhcpv6_pd = true;
 215         iface->dhcpv6_na = true;
 216         iface->ra_managed = RA_MANAGED_MFLAG;
 217         iface->ra_maxinterval = 600;
 218         iface->ra_mininterval = iface->ra_maxinterval/3;
 219         iface->ra_lifetime = -1;
 220         iface->ra_dns = true;
 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         avl_delete(&interfaces, &iface->avl);
 239
 240         router_setup_interface(iface, false);
 241         dhcpv6_setup_interface(iface, false);
 242         ndp_setup_interface(iface, false);
 243 #ifdef DHCPV4_SUPPORT
 244         dhcpv4_setup_interface(iface, false);
 245 #endif
 246
 247         clean_interface(iface);
 248         free(iface->addr4);
 249         free(iface->addr6);
 250         free(iface->ifname);
 251         free(iface);
 252 }
 253
 254 static int parse_mode(const char *mode)
 255 {
 256         if (!strcmp(mode, "disabled"))
 257                 return MODE_DISABLED;
 258         else if (!strcmp(mode, "server"))
 259                 return MODE_SERVER;
 260         else if (!strcmp(mode, "relay"))
 261                 return MODE_RELAY;
 262         else if (!strcmp(mode, "hybrid"))
 263                 return MODE_HYBRID;
 264         else
 265                 return -1;
 266 }
 267
 268 static void set_config(struct uci_section *s)
 269 {
 270         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 271
 272         blob_buf_init(&b, 0);
 273         uci_to_blob(&b, s, &odhcpd_attr_list);
 274         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 275
 276         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 277                 config.legacy = blobmsg_get_bool(c);
 278
 279         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 280                 config.main_dhcpv4 = blobmsg_get_bool(c);
 281
 282         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 283                 free(config.dhcp_statefile);
 284                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 285         }
 286
 287         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 288                 free(config.dhcp_cb);
 289                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 290         }
 291
 292         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 293                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 294
 295                 if (config.log_level != log_level) {
 296                         config.log_level = log_level;
 297                         setlogmask(LOG_UPTO(config.log_level));
 298                 }
 299         }
 300 }
 301
 302 static double parse_leasetime(struct blob_attr *c) {
 303         char *val = blobmsg_get_string(c), *endptr = NULL;
 304         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 305
 306         if (time && endptr && endptr[0]) {
 307                 if (endptr[0] == 's')
 308                         time *= 1;
 309                 else if (endptr[0] == 'm')
 310                         time *= 60;
 311                 else if (endptr[0] == 'h')
 312                         time *= 3600;
 313                 else if (endptr[0] == 'd')
 314                         time *= 24 * 3600;
 315                 else if (endptr[0] == 'w')
 316                         time *= 7 * 24 * 3600;
 317                 else
 318                         goto err;
 319         }
 320
 321         if (time < 60)
 322                 time = 60;
 323
 324         return time;
 325
 326 err:
 327         return -1;
 328 }
 329
 330 static void free_lease(struct lease *l)
 331 {
 332         free(l->hostname);
 333         free(l);
 334 }
 335
 336 static int set_lease(struct uci_section *s)
 337 {
 338         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 339         struct lease *l;
 340         size_t duidlen = 0;
 341         uint8_t *duid;
 342
 343         blob_buf_init(&b, 0);
 344         uci_to_blob(&b, s, &lease_attr_list);
 345         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 346
 347         if ((c = tb[LEASE_ATTR_DUID]))
 348                 duidlen = (blobmsg_data_len(c) - 1) / 2;
 349
 350         l = calloc_a(sizeof(*l), &duid, duidlen);
 351         if (!l)
 352                 goto err;
 353
 354         if ((c = tb[LEASE_ATTR_MAC]))
 355                 if (!ether_aton_r(blobmsg_get_string(c), &l->mac))
 356                         goto err;
 357
 358         if ((c = tb[LEASE_ATTR_DUID])) {
 359                 ssize_t len;
 360
 361                 l->duid = duid;
 362                 len = odhcpd_unhexlify(l->duid, duidlen, blobmsg_get_string(c));
 363
 364                 if (len < 0)
 365                         goto err;
 366
 367                 l->duid_len = len;
 368         }
 369
 370         if ((c = tb[LEASE_ATTR_NAME])) {
 371                 l->hostname = strdup(blobmsg_get_string(c));
 372                 if (!l->hostname || !odhcpd_valid_hostname(l->hostname))
 373                         goto err;
 374         }
 375
 376         if ((c = tb[LEASE_ATTR_IP]))
 377                 if (inet_pton(AF_INET, blobmsg_get_string(c), &l->ipaddr) < 0)
 378                         goto err;
 379
 380         if ((c = tb[LEASE_ATTR_HOSTID])) {
 381                 errno = 0;
 382                 l->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 383                 if (errno)
 384                         goto err;
 385         } else {
 386                 uint32_t i4a = ntohl(l->ipaddr) & 0xff;
 387                 l->hostid = ((i4a / 100) << 8) | (((i4a % 100) / 10) << 4) | (i4a % 10);
 388         }
 389
 390         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 391                 double time = parse_leasetime(c);
 392                 if (time < 0)
 393                         goto err;
 394
 395                 l->leasetime = time;
 396         }
 397
 398         INIT_LIST_HEAD(&l->assignments);
 399         vlist_add(&leases, &l->node, l);
 400         return 0;
 401
 402 err:
 403         if (l)
 404                 free_lease(l);
 405
 406         return -1;
 407 }
 408
 409 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 410 {
 411         struct interface *iface;
 412         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 413         bool get_addrs = false;
 414
 415         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 416
 417         if (tb[IFACE_ATTR_INTERFACE])
 418                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 419
 420         if (!name)
 421                 return -1;
 422
 423         iface = avl_find_element(&interfaces, name, iface, avl);
 424         if (!iface) {
 425                 char *new_name;
 426
 427                 iface = calloc_a(sizeof(*iface), &new_name, strlen(name) + 1);
 428                 if (!iface)
 429                         return -1;
 430
 431                 iface->name = strcpy(new_name, name);
 432                 iface->avl.key = iface->name;
 433                 iface->router_event.uloop.fd = -1;
 434                 iface->dhcpv6_event.uloop.fd = -1;
 435                 iface->ndp_event.uloop.fd = -1;
 436                 iface->ndp_ping_fd = -1;
 437                 iface->dhcpv4_event.uloop.fd = -1;
 438                 set_interface_defaults(iface);
 439
 440                 avl_insert(&interfaces, &iface->avl);
 441                 get_addrs = overwrite = true;
 442         }
 443
 444         const char *ifname = NULL;
 445         if (overwrite) {
 446                 if ((c = tb[IFACE_ATTR_IFNAME]))
 447                         ifname = blobmsg_get_string(c);
 448                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 449                         ifname = blobmsg_get_string(c);
 450         }
 451
 452 #ifdef WITH_UBUS
 453         if (overwrite || !iface->ifname)
 454                 ifname = ubus_get_ifname(name);
 455 #endif
 456
 457         if (!iface->ifname && !ifname)
 458                 goto err;
 459
 460         if (ifname) {
 461                 free(iface->ifname);
 462                 iface->ifname = strdup(ifname);
 463
 464                 if (!iface->ifname)
 465                         goto err;
 466
 467                 if (!iface->ifindex &&
 468                     (iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 469                         goto err;
 470         }
 471
 472         if (get_addrs) {
 473                 ssize_t len = netlink_get_interface_addrs(iface->ifindex,
 474                                                 true, &iface->addr6);
 475
 476                 if (len > 0)
 477                         iface->addr6_len = len;
 478
 479                 len = netlink_get_interface_addrs(iface->ifindex,
 480                                                 false, &iface->addr4);
 481                 if (len > 0)
 482                         iface->addr4_len = len;
 483         }
 484
 485         iface->inuse = true;
 486
 487         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 488                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 489
 490         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 491                 iface->ignore = blobmsg_get_bool(c);
 492
 493         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 494                 double time = parse_leasetime(c);
 495                 if (time < 0)
 496                         goto err;
 497
 498                 iface->dhcpv4_leasetime = time;
 499         }
 500
 501         if ((c = tb[IFACE_ATTR_START])) {
 502                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 503
 504                 if (config.main_dhcpv4 && config.legacy)
 505                         iface->dhcpv4 = MODE_SERVER;
 506         }
 507
 508         if ((c = tb[IFACE_ATTR_LIMIT]))
 509                 iface->dhcpv4_end.s_addr = htonl(
 510                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 511
 512         if ((c = tb[IFACE_ATTR_MASTER]))
 513                 iface->master = blobmsg_get_bool(c);
 514
 515         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 516                 struct blob_attr *cur;
 517                 unsigned rem;
 518
 519                 blobmsg_for_each_attr(cur, c, rem) {
 520                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 521                                 continue;
 522
 523                         iface->upstream = realloc(iface->upstream,
 524                                         iface->upstream_len + blobmsg_data_len(cur));
 525                         if (!iface->upstream)
 526                                 goto err;
 527
 528                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 529                         iface->upstream_len += blobmsg_data_len(cur);
 530                 }
 531         }
 532
 533         int mode;
 534         if ((c = tb[IFACE_ATTR_RA])) {
 535                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 536                         iface->ra = mode;
 537                 else
 538                         goto err;
 539         }
 540
 541         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 542                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 543                         if (config.main_dhcpv4)
 544                                 iface->dhcpv4 = mode;
 545                 }
 546                 else
 547                         goto err;
 548         }
 549
 550         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 551                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 552                         iface->dhcpv6 = mode;
 553                 else
 554                         goto err;
 555         }
 556
 557         if ((c = tb[IFACE_ATTR_NDP])) {
 558                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 559                         iface->ndp = mode;
 560                 else
 561                         goto err;
 562         }
 563
 564         if ((c = tb[IFACE_ATTR_ROUTER])) {
 565                 struct blob_attr *cur;
 566                 unsigned rem;
 567
 568                 blobmsg_for_each_attr(cur, c, rem) {
 569                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 570                                 continue;
 571
 572                         struct in_addr addr4;
 573                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 574                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 575                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 576                                 if (!iface->dhcpv4_router)
 577                                         goto err;
 578
 579                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 580                         } else
 581                                 goto err;
 582                 }
 583         }
 584
 585         if ((c = tb[IFACE_ATTR_DNS])) {
 586                 struct blob_attr *cur;
 587                 unsigned rem;
 588
 589                 iface->always_rewrite_dns = true;
 590                 blobmsg_for_each_attr(cur, c, rem) {
 591                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 592                                 continue;
 593
 594                         struct in_addr addr4;
 595                         struct in6_addr addr6;
 596                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 597                                 if (addr4.s_addr == INADDR_ANY)
 598                                         goto err;
 599
 600                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 601                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 602                                 if (!iface->dhcpv4_dns)
 603                                         goto err;
 604
 605                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 606                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 607                                 if (IN6_IS_ADDR_UNSPECIFIED(&addr6))
 608                                         goto err;
 609
 610                                 iface->dns = realloc(iface->dns,
 611                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 612                                 if (!iface->dns)
 613                                         goto err;
 614
 615                                 iface->dns[iface->dns_cnt - 1] = addr6;
 616                         } else
 617                                 goto err;
 618                 }
 619         }
 620
 621         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 622                 struct blob_attr *cur;
 623                 unsigned rem;
 624
 625                 blobmsg_for_each_attr(cur, c, rem) {
 626                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 627                                 continue;
 628
 629                         uint8_t buf[256];
 630                         char *domain = blobmsg_get_string(cur);
 631                         size_t domainlen = strlen(domain);
 632                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 633                                 domain[domainlen - 1] = 0;
 634
 635                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 636                         if (len <= 0)
 637                                 goto err;
 638
 639                         iface->search = realloc(iface->search, iface->search_len + len);
 640                         if (!iface->search)
 641                                 goto err;
 642
 643                         memcpy(&iface->search[iface->search_len], buf, len);
 644                         iface->search_len += len;
 645                 }
 646         }
 647
 648         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 649                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 650                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 651         }
 652
 653         if ((c = tb[IFACE_ATTR_DHCPV4_FORCERECONF]))
 654                 iface->dhcpv4_forcereconf = blobmsg_get_bool(c);
 655
 656         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 657                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 658                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 659                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 660         }
 661
 662         if ((c = tb[IFACE_ATTR_DHCPV6_ASSIGNALL]))
 663                 iface->dhcpv6_assignall = blobmsg_get_bool(c);
 664
 665         if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
 666                 iface->dhcpv6_pd = blobmsg_get_bool(c);
 667
 668         if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
 669                 iface->dhcpv6_na = blobmsg_get_bool(c);
 670
 671         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 672                 iface->default_router = blobmsg_get_u32(c);
 673
 674         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 675                 iface->ra_managed = blobmsg_get_u32(c);
 676
 677         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 678                 uint32_t ra_reachabletime = blobmsg_get_u32(c);
 679                 if (ra_reachabletime > 3600000)
 680                         goto err;
 681
 682                 iface->ra_reachabletime = ra_reachabletime;
 683         }
 684
 685         if ((c = tb[IFACE_ATTR_RA_RETRANSTIME])) {
 686                 uint32_t ra_retranstime = blobmsg_get_u32(c);
 687                 if (ra_retranstime > 60000)
 688                         goto err;
 689
 690                 iface->ra_retranstime = ra_retranstime;
 691         }
 692
 693         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 694                 uint32_t ra_hoplimit = blobmsg_get_u32(c);
 695                 if (ra_hoplimit > 255)
 696                         goto err;
 697
 698                 iface->ra_hoplimit = ra_hoplimit;
 699         }
 700
 701         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 702                 uint32_t ra_mtu = blobmsg_get_u32(c);
 703                 if (ra_mtu < 1280 || ra_mtu > 65535)
 704                         goto err;
 705
 706                 iface->ra_mtu = ra_mtu;
 707         }
 708
 709         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 710                 iface->ra_not_onlink = blobmsg_get_bool(c);
 711
 712         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 713                 iface->ra_advrouter = blobmsg_get_bool(c);
 714
 715         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 716                 iface->ra_mininterval =  blobmsg_get_u32(c);
 717
 718         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 719                 iface->ra_maxinterval = blobmsg_get_u32(c);
 720
 721         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 722                 iface->ra_lifetime = blobmsg_get_u32(c);
 723
 724         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 725                 iface->ra_useleasetime = blobmsg_get_bool(c);
 726
 727         if ((c = tb[IFACE_ATTR_RA_DNS]))
 728                 iface->ra_dns = blobmsg_get_bool(c);
 729
 730         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 731                 const char *prio = blobmsg_get_string(c);
 732
 733                 if (!strcmp(prio, "high"))
 734                         iface->route_preference = 1;
 735                 else if (!strcmp(prio, "low"))
 736                         iface->route_preference = -1;
 737                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 738                         iface->route_preference = 0;
 739                 else
 740                         goto err;
 741         }
 742
 743         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 744                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 745                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 746
 747         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 748                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 749                 goto err;
 750
 751         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 752                 iface->learn_routes = blobmsg_get_bool(c);
 753
 754         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 755                 iface->external = blobmsg_get_bool(c);
 756
 757         if ((c = tb[IFACE_ATTR_PREFIX_FILTER])) {
 758                 const char *str = blobmsg_get_string(c);
 759                 char *astr = malloc(strlen(str) + 1);
 760                 char *delim;
 761                 int l;
 762
 763                 if (!astr || !strcpy(astr, str) ||
 764                                 (delim = strchr(astr, '/')) == NULL || (*(delim++) = 0) ||
 765                                 sscanf(delim, "%i", &l) == 0 || l > 128 ||
 766                                 inet_pton(AF_INET6, astr, &iface->pio_filter_addr) == 0)
 767                         iface->pio_filter_length = 0;
 768                 else
 769                         iface->pio_filter_length = l;
 770
 771                 if (astr)
 772                         free(astr);
 773         }
 774
 775         return 0;
 776
 777 err:
 778         close_interface(iface);
 779         return -1;
 780 }
 781
 782 static int set_interface(struct uci_section *s)
 783 {
 784         blob_buf_init(&b, 0);
 785         uci_to_blob(&b, s, &interface_attr_list);
 786
 787         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 788 }
 789
 790 static void lease_delete_assignments(struct lease *l, bool v6)
 791 {
 792         struct dhcp_assignment *a, *tmp;
 793         unsigned int flag = v6 ? OAF_DHCPV6 : OAF_DHCPV4;
 794
 795         list_for_each_entry_safe(a, tmp, &l->assignments, lease_list) {
 796                 if (a->flags & flag)
 797                         free_assignment(a);
 798         }
 799 }
 800
 801 static void lease_update_assignments(struct lease *l)
 802 {
 803         struct dhcp_assignment *a;
 804
 805         list_for_each_entry(a, &l->assignments, lease_list) {
 806                 if (a->hostname)
 807                         free(a->hostname);
 808                 a->hostname = NULL;
 809
 810                 if (l->hostname)
 811                         a->hostname = strdup(l->hostname);
 812
 813                 a->leasetime = l->leasetime;
 814         }
 815 }
 816
 817 static int lease_cmp(const void *k1, const void *k2, _unused void *ptr)
 818 {
 819         const struct lease *l1 = k1, *l2 = k2;
 820         int cmp = 0;
 821
 822         if (l1->duid_len != l2->duid_len)
 823                 return l1->duid_len - l2->duid_len;
 824
 825         if (l1->duid_len && l2->duid_len)
 826                 cmp = memcmp(l1->duid, l2->duid, l1->duid_len);
 827
 828         if (cmp)
 829                 return cmp;
 830
 831         return memcmp(l1->mac.ether_addr_octet, l2->mac.ether_addr_octet,
 832                       sizeof(l1->mac.ether_addr_octet));
 833 }
 834
 835 static void lease_change_config(struct lease *l_old, struct lease *l_new)
 836 {
 837         bool update = false;
 838
 839         if ((!!l_new->hostname != !!l_old->hostname) ||
 840             (l_new->hostname && strcmp(l_new->hostname, l_old->hostname))) {
 841                 free(l_old->hostname);
 842                 l_old->hostname = NULL;
 843
 844                 if (l_new->hostname)
 845                         l_old->hostname = strdup(l_new->hostname);
 846
 847                 update = true;
 848         }
 849
 850         if (l_old->leasetime != l_new->leasetime) {
 851                 l_old->leasetime = l_new->leasetime;
 852                 update = true;
 853         }
 854
 855         if (l_old->ipaddr != l_new->ipaddr) {
 856                 l_old->ipaddr = l_new->ipaddr;
 857                 lease_delete_assignments(l_old, false);
 858         }
 859
 860         if (l_old->hostid != l_new->hostid) {
 861                 l_old->hostid = l_new->hostid;
 862                 lease_delete_assignments(l_old, true);
 863         }
 864
 865         if (update)
 866                 lease_update_assignments(l_old);
 867
 868         free_lease(l_new);
 869 }
 870
 871 static void lease_delete(struct lease *l)
 872 {
 873         struct dhcp_assignment *a;
 874
 875         list_for_each_entry(a, &l->assignments, lease_list)
 876                 free_assignment(a);
 877
 878         free_lease(l);
 879 }
 880
 881 static void lease_update(_unused struct vlist_tree *tree, struct vlist_node *node_new,
 882                          struct vlist_node *node_old)
 883 {
 884         struct lease *lease_new = container_of(node_new, struct lease, node);
 885         struct lease *lease_old = container_of(node_old, struct lease, node);
 886
 887         if (node_old && node_new)
 888                 lease_change_config(lease_old, lease_new);
 889         else if (node_old)
 890                 lease_delete(lease_old);
 891 }
 892
 893 struct lease *config_find_lease_by_duid(const uint8_t *duid, const uint16_t len)
 894 {
 895         struct lease *l;
 896
 897         vlist_for_each_element(&leases, l, node) {
 898                 if (l->duid_len == len && !memcmp(l->duid, duid, len))
 899                         return l;
 900         }
 901
 902         return NULL;
 903 }
 904
 905 struct lease *config_find_lease_by_mac(const uint8_t *mac)
 906 {
 907         struct lease *l;
 908
 909         vlist_for_each_element(&leases, l, node) {
 910                 if (!memcmp(l->mac.ether_addr_octet, mac,
 911                             sizeof(l->mac.ether_addr_octet)))
 912                         return l;
 913         }
 914
 915         return NULL;
 916 }
 917
 918 struct lease *config_find_lease_by_hostid(const uint32_t hostid)
 919 {
 920         struct lease *l;
 921
 922         vlist_for_each_element(&leases, l, node) {
 923                 if (l->hostid == hostid)
 924                         return l;
 925         }
 926
 927         return NULL;
 928 }
 929
 930 struct lease *config_find_lease_by_ipaddr(const uint32_t ipaddr)
 931 {
 932         struct lease *l;
 933
 934         vlist_for_each_element(&leases, l, node) {
 935                 if (l->ipaddr == ipaddr)
 936                         return l;
 937         }
 938
 939         return NULL;
 940 }
 941
 942 void odhcpd_reload(void)
 943 {
 944         struct uci_context *uci = uci_alloc_context();
 945         struct interface *master = NULL, *i, *tmp;
 946
 947         if (!uci)
 948                 return;
 949
 950         vlist_update(&leases);
 951         avl_for_each_element(&interfaces, i, avl)
 952                 clean_interface(i);
 953
 954         struct uci_package *dhcp = NULL;
 955         if (!uci_load(uci, "dhcp", &dhcp)) {
 956                 struct uci_element *e;
 957                 uci_foreach_element(&dhcp->sections, e) {
 958                         struct uci_section *s = uci_to_section(e);
 959                         if (!strcmp(s->type, "host"))
 960                                 set_lease(s);
 961                         else if (!strcmp(s->type, "odhcpd"))
 962                                 set_config(s);
 963                 }
 964
 965                 uci_foreach_element(&dhcp->sections, e) {
 966                         struct uci_section *s = uci_to_section(e);
 967                         if (!strcmp(s->type, "dhcp"))
 968                                 set_interface(s);
 969                 }
 970         }
 971
 972         if (config.dhcp_statefile) {
 973                 char *path = strdup(config.dhcp_statefile);
 974
 975                 mkdir_p(dirname(path), 0755);
 976                 free(path);
 977         }
 978
 979         vlist_flush(&leases);
 980
 981 #ifdef WITH_UBUS
 982         ubus_apply_network();
 983 #endif
 984
 985         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 986
 987         /* Test for */
 988         avl_for_each_element(&interfaces, i, avl) {
 989                 if (i->master)
 990                         continue;
 991
 992                 if (i->dhcpv6 == MODE_HYBRID || i->dhcpv6 == MODE_RELAY)
 993                         any_dhcpv6_slave = true;
 994
 995                 if (i->ra == MODE_HYBRID || i->ra == MODE_RELAY)
 996                         any_ra_slave = true;
 997
 998                 if (i->ndp == MODE_HYBRID || i->ndp == MODE_RELAY)
 999                         any_ndp_slave = true;
1000         }
1001
1002         /* Evaluate hybrid mode for master */
1003         avl_for_each_element(&interfaces, i, avl) {
1004                 if (!i->master)
1005                         continue;
1006
1007                 enum odhcpd_mode hybrid_mode = MODE_DISABLED;
1008 #ifdef WITH_UBUS
1009                 if (!ubus_has_prefix(i->name, i->ifname))
1010                         hybrid_mode = MODE_RELAY;
1011 #endif
1012
1013                 if (i->dhcpv6 == MODE_HYBRID)
1014                         i->dhcpv6 = hybrid_mode;
1015
1016                 if (i->dhcpv6 == MODE_RELAY && !any_dhcpv6_slave)
1017                         i->dhcpv6 = MODE_DISABLED;
1018
1019                 if (i->ra == MODE_HYBRID)
1020                         i->ra = hybrid_mode;
1021
1022                 if (i->ra == MODE_RELAY && !any_ra_slave)
1023                         i->ra = MODE_DISABLED;
1024
1025                 if (i->ndp == MODE_HYBRID)
1026                         i->ndp = hybrid_mode;
1027
1028                 if (i->ndp == MODE_RELAY && !any_ndp_slave)
1029                         i->ndp = MODE_DISABLED;
1030
1031                 if (i->dhcpv6 == MODE_RELAY || i->ra == MODE_RELAY || i->ndp == MODE_RELAY)
1032                         master = i;
1033         }
1034
1035
1036         avl_for_each_element_safe(&interfaces, i, avl, tmp) {
1037                 if (i->inuse) {
1038                         /* Resolve hybrid mode */
1039                         if (i->dhcpv6 == MODE_HYBRID)
1040                                 i->dhcpv6 = (master && master->dhcpv6 == MODE_RELAY) ?
1041                                                 MODE_RELAY : MODE_SERVER;
1042
1043                         if (i->ra == MODE_HYBRID)
1044                                 i->ra = (master && master->ra == MODE_RELAY) ?
1045                                                 MODE_RELAY : MODE_SERVER;
1046
1047                         if (i->ndp == MODE_HYBRID)
1048                                 i->ndp = (master && master->ndp == MODE_RELAY) ?
1049                                                 MODE_RELAY : MODE_DISABLED;
1050
1051                         router_setup_interface(i, !i->ignore || i->ra != MODE_DISABLED);
1052                         dhcpv6_setup_interface(i, !i->ignore || i->dhcpv6 != MODE_DISABLED);
1053                         ndp_setup_interface(i, !i->ignore || i->ndp != MODE_DISABLED);
1054 #ifdef DHCPV4_SUPPORT
1055                         dhcpv4_setup_interface(i, !i->ignore || i->dhcpv4 != MODE_DISABLED);
1056 #endif
1057                 } else
1058                         close_interface(i);
1059         }
1060
1061         uci_unload(uci, dhcp);
1062         uci_free_context(uci);
1063 }
1064
1065 static void handle_signal(int signal)
1066 {
1067         char b[1] = {0};
1068
1069         if (signal == SIGHUP) {
1070                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
1071         } else
1072                 uloop_end();
1073 }
1074
1075 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
1076 {
1077         char b[512];
1078         if (read(u->fd, b, sizeof(b)) < 0) {}
1079
1080         odhcpd_reload();
1081 }
1082
1083 static struct uloop_fd reload_fd = { .cb = reload_cb };
1084
1085 void odhcpd_run(void)
1086 {
1087         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
1088
1089         reload_fd.fd = reload_pipe[0];
1090         uloop_fd_add(&reload_fd, ULOOP_READ);
1091
1092         signal(SIGTERM, handle_signal);
1093         signal(SIGINT, handle_signal);
1094         signal(SIGHUP, handle_signal);
1095
1096 #ifdef WITH_UBUS
1097         while (ubus_init())
1098                 sleep(1);
1099 #endif
1100
1101         odhcpd_reload();
1102         uloop_run();
1103 }