interface-ip.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2012 Steven Barth <steven@midlink.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18
  19 #include <limits.h>
  20 #include <arpa/inet.h>
  21 #include <netinet/in.h>
  22
  23 #include "netifd.h"
  24 #include "device.h"
  25 #include "interface.h"
  26 #include "interface-ip.h"
  27 #include "proto.h"
  28 #include "ubus.h"
  29 #include "system.h"
  30
  31 enum {
  32         ROUTE_INTERFACE,
  33         ROUTE_TARGET,
  34         ROUTE_MASK,
  35         ROUTE_GATEWAY,
  36         ROUTE_METRIC,
  37         ROUTE_MTU,
  38         ROUTE_VALID,
  39         ROUTE_TABLE,
  40         ROUTE_SOURCE,
  41         ROUTE_ONLINK,
  42         ROUTE_TYPE,
  43         ROUTE_PROTO,
  44         __ROUTE_MAX
  45 };
  46
  47 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  48         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  49         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  50         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  51         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  52         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  53         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  54         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  55         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  56         [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
  57         [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
  58         [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  59         [ROUTE_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  60 };
  61
  62 const struct uci_blob_param_list route_attr_list = {
  63         .n_params = __ROUTE_MAX,
  64         .params = route_attr,
  65 };
  66
  67
  68 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  69 static struct device_prefix *ula_prefix = NULL;
  70 static struct uloop_timeout valid_until_timeout;
  71
  72
  73 static void
  74 clear_if_addr(union if_addr *a, int mask)
  75 {
  76         int m_bytes = (mask + 7) / 8;
  77         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  78         uint8_t *p = (uint8_t *) a;
  79
  80         if (m_bytes < sizeof(*a))
  81                 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
  82
  83         p[m_bytes - 1] &= ~m_clear;
  84 }
  85
  86 static bool
  87 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  88 {
  89         union if_addr *p1, *p2;
  90
  91         p1 = alloca(sizeof(*a1));
  92         p2 = alloca(sizeof(*a2));
  93
  94         memcpy(p1, a1, sizeof(*a1));
  95         clear_if_addr(p1, mask);
  96         memcpy(p2, a2, sizeof(*a2));
  97         clear_if_addr(p2, mask);
  98
  99         return !memcmp(p1, p2, sizeof(*p1));
 100 }
 101
 102 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
 103                 const union if_addr *addr, uint8_t mask, unsigned int table,
 104                 struct interface *in_iface, const char *action, bool src)
 105 {
 106         struct iprule rule = {
 107                 .flags = IPRULE_PRIORITY,
 108                 .priority = priority
 109         };
 110
 111         if (addr) {
 112                 if (src) {
 113                         rule.flags |= IPRULE_SRC;
 114                         rule.src_addr = *addr;
 115                         rule.src_mask = mask;
 116                 } else {
 117                         rule.flags |= IPRULE_DEST;
 118                         rule.dest_addr = *addr;
 119                         rule.dest_mask = mask;
 120                 }
 121         }
 122
 123         if (table) {
 124                 rule.flags |= IPRULE_LOOKUP;
 125                 rule.lookup = table;
 126
 127                 if (!rule.lookup)
 128                         return 0;
 129         } else if (action) {
 130                 rule.flags |= IPRULE_ACTION;
 131                 system_resolve_iprule_action(action, &rule.action);
 132         }
 133
 134         if (in_iface && in_iface->l3_dev.dev) {
 135                 rule.flags |= IPRULE_IN;
 136                 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
 137         }
 138
 139         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 140
 141         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 142 }
 143
 144 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 145 {
 146         struct iprule rule = {
 147                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 148                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 149                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 150                 .in_dev = "lo"
 151         };
 152
 153         if (!rule.lookup)
 154                 return 0;
 155
 156         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 157
 158         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 159 }
 160
 161 static bool
 162 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 163 {
 164         struct device_addr *addr;
 165
 166         vlist_for_each_element(&ip->addr, addr, node) {
 167                 if (!addr->enabled)
 168                         continue;
 169
 170                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 171                         continue;
 172
 173                 // Handle offlink addresses correctly
 174                 unsigned int mask = addr->mask;
 175                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 176                                 (addr->flags & DEVADDR_OFFLINK))
 177                         mask = 128;
 178
 179                 if (!match_if_addr(&addr->addr, a, mask))
 180                         continue;
 181
 182                 return true;
 183         }
 184
 185         return false;
 186 }
 187
 188 static void
 189 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 190                        bool v6, struct device_route **res)
 191 {
 192         struct device_route *route;
 193
 194         vlist_for_each_element(&ip->route, route, node) {
 195                 if (!route->enabled)
 196                         continue;
 197
 198                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 199                         continue;
 200
 201                 if (!match_if_addr(&route->addr, a, route->mask))
 202                         continue;
 203
 204                 if (route->flags & DEVROUTE_TABLE)
 205                         continue;
 206
 207                 if (!*res || route->mask < (*res)->mask)
 208                         *res = route;
 209         }
 210 }
 211
 212 static bool
 213 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 214 {
 215         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 216                __find_ip_addr_target(&iface->config_ip, a, v6);
 217 }
 218
 219 static void
 220 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 221                                bool v6, struct device_route **route)
 222 {
 223         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 224         __find_ip_route_target(&iface->config_ip, a, v6, route);
 225 }
 226
 227 struct interface *
 228 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 229 {
 230         struct device_route *route, *r_next = NULL;
 231         bool defaultroute_target = false;
 232         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 233
 234         route = calloc(1, sizeof(*route));
 235         if (!route)
 236                 return NULL;
 237
 238         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 239         route->mask = v6 ? 128 : 32;
 240         if (memcmp(&route->addr, addr, addrsize) == 0)
 241                 defaultroute_target = true;
 242         else
 243                 memcpy(&route->addr, addr, addrsize);
 244
 245         if (iface) {
 246                 /* look for locally addressable target first */
 247                 if (interface_ip_find_addr_target(iface, addr, v6))
 248                         goto done;
 249
 250                 /* do not stop at the first route, let the lookup compare
 251                  * masks to find the best match */
 252                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 253         } else {
 254                 vlist_for_each_element(&interfaces, iface, node) {
 255                         /* look for locally addressable target first */
 256                         if (interface_ip_find_addr_target(iface, addr, v6))
 257                                 goto done;
 258
 259                         /* do not stop at the first route, let the lookup compare
 260                          * masks to find the best match */
 261                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 262                 }
 263         }
 264
 265         if (!r_next) {
 266                 free(route);
 267                 return NULL;
 268         }
 269
 270         iface = r_next->iface;
 271         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 272         route->mtu = r_next->mtu;
 273         route->metric = r_next->metric;
 274         route->table = r_next->table;
 275
 276 done:
 277         route->iface = iface;
 278         if (defaultroute_target)
 279                 free(route);
 280         else
 281                 vlist_add(&iface->host_routes, &route->node, route);
 282         return iface;
 283 }
 284
 285 static void
 286 interface_set_route_info(struct interface *iface, struct device_route *route)
 287 {
 288         bool v6 = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6);
 289
 290         if (!iface)
 291                 return;
 292
 293         if (!(route->flags & DEVROUTE_METRIC))
 294                 route->metric = iface->metric;
 295
 296         if (!(route->flags & DEVROUTE_TABLE)) {
 297                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 298                 if (route->table)
 299                         route->flags |= DEVROUTE_SRCTABLE;
 300         }
 301 }
 302
 303 void
 304 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 305 {
 306         struct interface_ip_settings *ip;
 307         struct blob_attr *tb[__ROUTE_MAX], *cur;
 308         struct device_route *route;
 309         int af = v6 ? AF_INET6 : AF_INET;
 310
 311         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 312
 313         if (!iface) {
 314                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 315                         return;
 316
 317                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 318                 if (!iface)
 319                         return;
 320
 321                 ip = &iface->config_ip;
 322         } else {
 323                 ip = &iface->proto_ip;
 324         }
 325
 326         route = calloc(1, sizeof(*route));
 327         if (!route)
 328                 return;
 329
 330         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 331         route->mask = v6 ? 128 : 32;
 332         if ((cur = tb[ROUTE_MASK]) != NULL) {
 333                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 334                 if (route->mask > (v6 ? 128 : 32))
 335                         goto error;
 336         }
 337
 338         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 339                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 340                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 341                         goto error;
 342                 }
 343         }
 344
 345         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 346                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 347                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 348                         goto error;
 349                 }
 350         }
 351
 352         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 353                 route->metric = blobmsg_get_u32(cur);
 354                 route->flags |= DEVROUTE_METRIC;
 355         }
 356
 357         if ((cur = tb[ROUTE_MTU]) != NULL) {
 358                 route->mtu = blobmsg_get_u32(cur);
 359                 route->flags |= DEVROUTE_MTU;
 360         }
 361
 362         // Use source-based routing
 363         if ((cur = tb[ROUTE_SOURCE]) != NULL) {
 364                 char *saveptr, *source = alloca(blobmsg_data_len(cur));
 365                 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
 366
 367                 const char *addr = strtok_r(source, "/", &saveptr);
 368                 const char *mask = strtok_r(NULL, "/", &saveptr);
 369
 370                 if (!addr || inet_pton(af, addr, &route->source) < 1) {
 371                         DPRINTF("Failed to parse route source: %s\n", addr ? addr : "NULL");
 372                         goto error;
 373                 }
 374
 375                 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
 376         }
 377
 378         if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
 379                 route->flags |= DEVROUTE_ONLINK;
 380
 381         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 382                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 383                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 384                         goto error;
 385                 }
 386
 387                 /* only set the table flag if not using the main (default) table */
 388                 if (system_is_default_rt_table(route->table))
 389                         route->table = 0;
 390
 391                 if (route->table)
 392                         route->flags |= DEVROUTE_TABLE;
 393         }
 394
 395         if ((cur = tb[ROUTE_VALID]) != NULL) {
 396                 int64_t valid = blobmsg_get_u32(cur);
 397                 int64_t valid_until = valid + (int64_t)system_get_rtime();
 398                 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
 399                         route->valid_until = valid_until;
 400         }
 401
 402         if ((cur = tb[ROUTE_TYPE]) != NULL) {
 403                 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
 404                         DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
 405                         goto error;
 406                 }
 407                 route->flags |= DEVROUTE_TYPE;
 408         }
 409
 410         if ((cur = tb[ROUTE_PROTO]) != NULL) {
 411                 if (!system_resolve_rt_proto(blobmsg_data(cur), &route->proto)) {
 412                         DPRINTF("Failed to resolve proto type: %s\n", (char *) blobmsg_data(cur));
 413                         goto error;
 414                 }
 415                 route->flags |= DEVROUTE_PROTO;
 416         }
 417
 418         interface_set_route_info(iface, route);
 419         vlist_add(&ip->route, &route->node, route);
 420         return;
 421
 422 error:
 423         free(route);
 424 }
 425
 426 static int
 427 addr_cmp(const void *k1, const void *k2, void *ptr)
 428 {
 429         return memcmp(k1, k2, sizeof(struct device_addr) -
 430                       offsetof(struct device_addr, flags));
 431 }
 432
 433 static int
 434 route_cmp(const void *k1, const void *k2, void *ptr)
 435 {
 436         const struct device_route *r1 = k1, *r2 = k2;
 437
 438         if (r1->mask != r2->mask)
 439                 return r2->mask - r1->mask;
 440
 441         if (r1->metric != r2->metric)
 442                 return r1->metric - r2->metric;
 443
 444         if (r1->flags != r2->flags)
 445                 return r2->flags - r1->flags;
 446
 447         if (r1->sourcemask != r2->sourcemask)
 448                 return r1->sourcemask - r2->sourcemask;
 449
 450         if (r1->table != r2->table)
 451                 return r1->table - r2->table;
 452
 453         int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
 454         if (maskcmp)
 455                 return maskcmp;
 456
 457         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 458 }
 459
 460 static int
 461 prefix_cmp(const void *k1, const void *k2, void *ptr)
 462 {
 463         return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
 464                         offsetof(struct device_prefix, addr));
 465 }
 466
 467 static void
 468 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 469 {
 470         struct device *dev = iface->l3_dev.dev;
 471         struct device_route *r = &addr->subnet;
 472
 473         if (addr->flags & DEVADDR_OFFLINK)
 474                 return;
 475
 476         if (!add) {
 477                 if (!addr->subnet.iface)
 478                         return;
 479
 480                 system_del_route(dev, r);
 481                 memset(r, 0, sizeof(*r));
 482                 return;
 483         }
 484
 485         r->iface = iface;
 486         r->flags = addr->flags;
 487         r->mask = addr->mask;
 488         memcpy(&r->addr, &addr->addr, sizeof(r->addr));
 489         clear_if_addr(&r->addr, r->mask);
 490
 491         if (!system_resolve_rt_proto("kernel", &r->proto))
 492                 return;
 493
 494         r->flags |= DEVROUTE_PROTO;
 495         system_del_route(dev, r);
 496
 497         r->flags &= ~DEVROUTE_PROTO;
 498         interface_set_route_info(iface, r);
 499
 500         system_add_route(dev, r);
 501 }
 502
 503 static void
 504 interface_add_addr_rules(struct device_addr *addr, bool enabled)
 505 {
 506         bool v6 = (addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6;
 507
 508         set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR, &addr->addr,
 509                              (v6) ? 128 : 32, addr->policy_table, NULL, NULL,
 510                              true);
 511         set_ip_source_policy(enabled, v6, IPRULE_PRIORITY_ADDR_MASK,
 512                              &addr->addr, addr->mask, addr->policy_table, NULL,
 513                              NULL, false);
 514 }
 515
 516 static void
 517 interface_update_proto_addr(struct vlist_tree *tree,
 518                             struct vlist_node *node_new,
 519                             struct vlist_node *node_old)
 520 {
 521         struct interface_ip_settings *ip;
 522         struct interface *iface;
 523         struct device *dev;
 524         struct device_addr *a_new = NULL, *a_old = NULL;
 525         bool replace = false;
 526         bool keep = false;
 527         bool v6 = false;
 528
 529         ip = container_of(tree, struct interface_ip_settings, addr);
 530         iface = ip->iface;
 531         dev = iface->l3_dev.dev;
 532
 533         if (!node_new || !node_old)
 534                 iface->updated |= IUF_ADDRESS;
 535
 536         if (node_new) {
 537                 a_new = container_of(node_new, struct device_addr, node);
 538
 539                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 540                     !a_new->broadcast) {
 541
 542                         /* /31 and /32 addressing need 255.255.255.255
 543                          * as broadcast address. */
 544                         if (a_new->mask >= 31) {
 545                                 a_new->broadcast = (uint32_t) ~0;
 546                         } else {
 547                                 uint32_t mask = ~0;
 548                                 uint32_t *a = (uint32_t *) &a_new->addr;
 549
 550                                 mask >>= a_new->mask;
 551                                 a_new->broadcast = *a | htonl(mask);
 552                         }
 553                 }
 554         }
 555
 556         if (node_old)
 557                 a_old = container_of(node_old, struct device_addr, node);
 558
 559         if (a_new && a_old) {
 560                 keep = true;
 561
 562                 if (a_old->flags != a_new->flags || a_old->failed)
 563                         keep = false;
 564
 565                 if (a_old->valid_until != a_new->valid_until ||
 566                                 a_old->preferred_until != a_new->preferred_until)
 567                         replace = true;
 568
 569                 if (((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4) &&
 570                      (a_new->broadcast != a_old->broadcast ||
 571                       a_new->point_to_point != a_old->point_to_point))
 572                         keep = false;
 573         }
 574
 575         if (node_old) {
 576                 if (a_old->enabled && !keep) {
 577                         //This is needed for source routing to work correctly. If a device
 578                         //has two connections to a network using the same subnet, adding
 579                         //only the network-rule will cause packets to be routed through the
 580                         //first matching network (source IP matches both masks).
 581                         if (a_old->policy_table)
 582                                 interface_add_addr_rules(a_old, false);
 583
 584                         if (!(a_old->flags & DEVADDR_EXTERNAL)) {
 585                                 interface_handle_subnet_route(iface, a_old, false);
 586                                 system_del_address(dev, a_old);
 587                         }
 588                 }
 589                 free(a_old->pclass);
 590                 free(a_old);
 591         }
 592
 593         if (node_new) {
 594                 a_new->enabled = true;
 595
 596                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 597                                 v6 = true;
 598
 599                 a_new->policy_table = (v6) ? iface->ip6table : iface->ip4table;
 600
 601                 if (!keep || replace) {
 602                         if (!(a_new->flags & DEVADDR_EXTERNAL)) {
 603                                 if (system_add_address(dev, a_new))
 604                                         a_new->failed = true;
 605
 606                                 if (iface->metric || a_new->policy_table)
 607                                         interface_handle_subnet_route(iface, a_new, true);
 608                         }
 609
 610                         if (!keep) {
 611                                 if (a_new->policy_table)
 612                                         interface_add_addr_rules(a_new, true);
 613                         }
 614                 }
 615         }
 616 }
 617
 618 static bool
 619 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 620 {
 621         if (ip->no_defaultroute && !route->mask)
 622                 return false;
 623
 624         return ip->enabled;
 625 }
 626
 627 static void
 628 interface_update_proto_route(struct vlist_tree *tree,
 629                              struct vlist_node *node_new,
 630                              struct vlist_node *node_old)
 631 {
 632         struct interface_ip_settings *ip;
 633         struct interface *iface;
 634         struct device *dev;
 635         struct device_route *route_old, *route_new;
 636         bool keep = false;
 637
 638         ip = container_of(tree, struct interface_ip_settings, route);
 639         iface = ip->iface;
 640         dev = iface->l3_dev.dev;
 641
 642         if (!node_new || !node_old)
 643                 iface->updated |= IUF_ROUTE;
 644
 645         route_old = container_of(node_old, struct device_route, node);
 646         route_new = container_of(node_new, struct device_route, node);
 647
 648         if (node_old && node_new)
 649                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
 650                         (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
 651                         (route_old->proto == route_new->proto) && !route_old->failed;
 652
 653         if (node_old) {
 654                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 655                         system_del_route(dev, route_old);
 656
 657                 free(route_old);
 658         }
 659
 660         if (node_new) {
 661                 bool _enabled = enable_route(ip, route_new);
 662
 663                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 664                         if (system_add_route(dev, route_new))
 665                                 route_new->failed = true;
 666
 667                 route_new->iface = iface;
 668                 route_new->enabled = _enabled;
 669         }
 670 }
 671
 672 static void
 673 interface_update_host_route(struct vlist_tree *tree,
 674                              struct vlist_node *node_new,
 675                              struct vlist_node *node_old)
 676 {
 677         struct interface *iface;
 678         struct device *dev;
 679         struct device_route *route_old, *route_new;
 680
 681         iface = container_of(tree, struct interface, host_routes);
 682         dev = iface->l3_dev.dev;
 683
 684         route_old = container_of(node_old, struct device_route, node);
 685         route_new = container_of(node_new, struct device_route, node);
 686
 687         if (node_old) {
 688                 system_del_route(dev, route_old);
 689                 free(route_old);
 690         }
 691
 692         if (node_new) {
 693                 if (system_add_route(dev, route_new))
 694                         route_new->failed = true;
 695         }
 696 }
 697
 698 static void
 699 random_ifaceid(struct in6_addr *addr)
 700 {
 701         static bool initialized = false;
 702         struct timeval t;
 703
 704         if (!initialized) {
 705                 long int seed = 0;
 706                 gettimeofday(&t, NULL);
 707                 seed = t.tv_sec ^ t.tv_usec ^ getpid();
 708                 srand48(seed);
 709                 initialized = true;
 710         }
 711         addr->s6_addr32[2] = (uint32_t)mrand48();
 712         addr->s6_addr32[3] = (uint32_t)mrand48();
 713 }
 714
 715 static bool
 716 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
 717 {
 718         struct device_settings st;
 719
 720         device_merge_settings(iface->l3_dev.dev, &st);
 721
 722         if (!(st.flags & DEV_OPT_MACADDR))
 723                 return false;
 724
 725         /* get mac address */
 726         uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
 727         uint8_t *ifaceid = addr->s6_addr + 8;
 728         memcpy(ifaceid,macaddr,3);
 729         memcpy(ifaceid + 5,macaddr + 3, 3);
 730         ifaceid[3] = 0xff;
 731         ifaceid[4] = 0xfe;
 732         ifaceid[0] ^= 0x02;
 733
 734         return true;
 735 }
 736
 737 static bool
 738 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
 739 {
 740         bool ret = true;
 741
 742         /* generate new iface id */
 743         switch (iface->assignment_iface_id_selection) {
 744         case IFID_FIXED:
 745                 /* fixed */
 746                 /* copy host part from assignment_fixed_iface_id */
 747                 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
 748                 break;
 749         case IFID_RANDOM:
 750                 /* randomize last 64 bits */
 751                 random_ifaceid(addr);
 752                 break;
 753         case IFID_EUI64:
 754                 /* eui64 */
 755                 ret = eui64_ifaceid(iface, addr);
 756                 break;
 757         default:
 758                 ret = false;
 759                 break;
 760         }
 761         return ret;
 762 }
 763
 764 static void
 765 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 766                 const struct device_prefix *prefix, struct interface *iface, bool add)
 767 {
 768         const struct interface *uplink = prefix->iface;
 769         if (!iface->l3_dev.dev)
 770                 return;
 771
 772         struct device *l3_downlink = iface->l3_dev.dev;
 773
 774         struct device_addr addr;
 775         struct device_route route;
 776         memset(&addr, 0, sizeof(addr));
 777         memset(&route, 0, sizeof(route));
 778
 779         addr.addr.in6 = assignment->addr;
 780         addr.mask = assignment->length;
 781         addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
 782         addr.preferred_until = prefix->preferred_until;
 783         addr.valid_until = prefix->valid_until;
 784
 785         route.flags = DEVADDR_INET6;
 786         route.mask = addr.mask < 64 ? 64 : addr.mask;
 787         route.addr = addr.addr;
 788
 789         if (!add && assignment->enabled) {
 790                 time_t now = system_get_rtime();
 791
 792                 addr.preferred_until = now;
 793                 if (!addr.valid_until || addr.valid_until - now > 7200)
 794                         addr.valid_until = now + 7200;
 795
 796                 if (iface->ip6table)
 797                         set_ip_source_policy(false, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
 798                                         addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
 799
 800                 if (prefix->iface) {
 801                         if (prefix->iface->ip6table)
 802                                 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
 803                                                 addr.mask, prefix->iface->ip6table, iface, NULL, true);
 804
 805                         set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 806                                                         addr.mask, 0, iface, "unreachable", true);
 807                 }
 808
 809                 clear_if_addr(&route.addr, route.mask);
 810                 interface_set_route_info(iface, &route);
 811
 812                 system_del_route(l3_downlink, &route);
 813                 system_add_address(l3_downlink, &addr);
 814
 815                 assignment->addr = in6addr_any;
 816                 assignment->enabled = false;
 817         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 818                 if (IN6_IS_ADDR_UNSPECIFIED(&addr.addr.in6)) {
 819                         addr.addr.in6 = prefix->addr;
 820                         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 821                         if (!generate_ifaceid(iface, &addr.addr.in6))
 822                                 return;
 823
 824                         assignment->addr = addr.addr.in6;
 825                         route.addr = addr.addr;
 826                 }
 827
 828                 if (system_add_address(l3_downlink, &addr))
 829                         return;
 830
 831                 if (!assignment->enabled) {
 832                         if (iface->ip6table)
 833                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_ADDR_MASK, &addr.addr,
 834                                                 addr.mask < 64 ? 64 : addr.mask, iface->ip6table, NULL, NULL, false);
 835
 836                         if (prefix->iface) {
 837                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 838                                                 addr.mask, 0, iface, "unreachable", true);
 839
 840                                 if (prefix->iface->ip6table)
 841                                         set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
 842                                                         addr.mask, prefix->iface->ip6table, iface, NULL, true);
 843                         }
 844                 }
 845
 846                 clear_if_addr(&route.addr, route.mask);
 847                 interface_set_route_info(iface, &route);
 848
 849                 system_add_route(l3_downlink, &route);
 850
 851                 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
 852                         int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
 853                         int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
 854
 855                         if (mtu > 0 && mtu_old > mtu)
 856                                 system_update_ipv6_mtu(l3_downlink, mtu);
 857                 }
 858
 859                 assignment->enabled = true;
 860         }
 861 }
 862
 863 static bool interface_prefix_assign(struct list_head *list,
 864                 struct device_prefix_assignment *assign)
 865 {
 866         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 867         struct device_prefix_assignment *c;
 868         list_for_each_entry(c, list, head) {
 869                 if (assign->assigned != -1) {
 870                         if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
 871                                 list_add_tail(&assign->head, &c->head);
 872                                 return true;
 873                         }
 874                 } else if (assign->assigned == -1) {
 875                         current = (current + asize) & (~asize);
 876                         if (current + asize < c->assigned) {
 877                                 assign->assigned = current;
 878                                 list_add_tail(&assign->head, &c->head);
 879                                 return true;
 880                         }
 881                 }
 882                 current = (c->assigned + (1 << (64 - c->length)));
 883         }
 884         return false;
 885 }
 886
 887 /*
 888  * Sorting of assignment entries:
 889  * Primary on assignment length: smallest assignment first
 890  * Secondary on assignment weight: highest weight first
 891  * Finally alphabetical order of interface names
 892  */
 893 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
 894 {
 895         const struct device_prefix_assignment *a1 = k1, *a2 = k2;
 896
 897         if (a1->length != a2->length)
 898                 return a1->length - a2->length;
 899
 900         if (a1->weight != a2->weight)
 901                 return a2->weight - a1->weight;
 902
 903         return strcmp(a1->name, a2->name);
 904 }
 905
 906 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 907 {
 908         struct device_prefix_assignment *c;
 909         struct interface *iface;
 910
 911         // Delete all assignments
 912         while (!list_empty(&prefix->assignments)) {
 913                 c = list_first_entry(&prefix->assignments,
 914                                 struct device_prefix_assignment, head);
 915                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 916                         interface_set_prefix_address(c, prefix, iface, false);
 917                 list_del(&c->head);
 918                 free(c);
 919         }
 920
 921         if (!setup)
 922                 return;
 923
 924         // End-of-assignment sentinel
 925         c = malloc(sizeof(*c) + 1);
 926         if (!c)
 927                 return;
 928
 929         c->assigned = 1 << (64 - prefix->length);
 930         c->length = 64;
 931         c->name[0] = 0;
 932         c->addr = in6addr_any;
 933         list_add(&c->head, &prefix->assignments);
 934
 935         // Excluded prefix
 936         if (prefix->excl_length > 0) {
 937                 const char name[] = "!excluded";
 938                 c = malloc(sizeof(*c) + sizeof(name));
 939                 if (c) {
 940                         c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 941                                         ((1 << (64 - prefix->length)) - 1);
 942                         c->length = prefix->excl_length;
 943                         c->addr = in6addr_any;
 944                         memcpy(c->name, name, sizeof(name));
 945                         list_add(&c->head, &prefix->assignments);
 946                 }
 947         }
 948
 949         bool assigned_any = false;
 950         struct {
 951                 struct avl_node node;
 952         } *entry, *n_entry;
 953         struct avl_tree assign_later;
 954
 955         avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
 956
 957         vlist_for_each_element(&interfaces, iface, node) {
 958                 if (iface->assignment_length < 48 ||
 959                                 iface->assignment_length > 64)
 960                         continue;
 961
 962                 // Test whether there is a matching class
 963                 if (!list_empty(&iface->assignment_classes)) {
 964                         bool found = false;
 965
 966                         struct interface_assignment_class *c;
 967                         list_for_each_entry(c, &iface->assignment_classes, head) {
 968                                 if (!strcmp(c->name, prefix->pclass)) {
 969                                         found = true;
 970                                         break;
 971                                 }
 972                         }
 973
 974                         if (!found)
 975                                 continue;
 976                 }
 977
 978                 size_t namelen = strlen(iface->name) + 1;
 979                 c = malloc(sizeof(*c) + namelen);
 980                 if (!c)
 981                         continue;
 982
 983                 c->length = iface->assignment_length;
 984                 c->assigned = iface->assignment_hint;
 985                 c->weight = iface->assignment_weight;
 986                 c->addr = in6addr_any;
 987                 c->enabled = false;
 988                 memcpy(c->name, iface->name, namelen);
 989
 990                 // First process all custom assignments, put all others in later-list
 991                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 992                         if (c->assigned != -1) {
 993                                 c->assigned = -1;
 994                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 995                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 996                         }
 997
 998                         entry = calloc(1, sizeof(*entry));
 999                         if (!entry)
1000                                 continue;
1001
1002                         entry->node.key = c;
1003                         avl_insert(&assign_later, &entry->node);
1004                 }
1005
1006                 if (c->assigned != -1)
1007                         assigned_any = true;
1008         }
1009
1010         /* Then try to assign all other + failed custom assignments */
1011         avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
1012                 bool assigned = false;
1013
1014                 c = (struct device_prefix_assignment *)entry->node.key;
1015                 avl_delete(&assign_later, &entry->node);
1016
1017                 do {
1018                         assigned = interface_prefix_assign(&prefix->assignments, c);
1019                 } while (!assigned && ++c->length <= 64);
1020
1021                 if (!assigned) {
1022                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
1023                                         "of size %hhu for %s\n", c->length, c->name);
1024                         free(c);
1025                 } else
1026                         assigned_any = true;
1027
1028                 free(entry);
1029         }
1030
1031         list_for_each_entry(c, &prefix->assignments, head)
1032                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1033                         interface_set_prefix_address(c, prefix, iface, true);
1034
1035         if (!assigned_any)
1036                 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1037                                 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1038 }
1039
1040
1041 void interface_refresh_assignments(bool hint)
1042 {
1043         static bool refresh = false;
1044         if (!hint && refresh) {
1045                 struct device_prefix *p;
1046                 list_for_each_entry(p, &prefixes, head)
1047                         interface_update_prefix_assignments(p, true);
1048         }
1049         refresh = hint;
1050 }
1051
1052
1053 static void
1054 interface_update_prefix(struct vlist_tree *tree,
1055                              struct vlist_node *node_new,
1056                              struct vlist_node *node_old)
1057 {
1058         struct device_prefix *prefix_old, *prefix_new;
1059         prefix_old = container_of(node_old, struct device_prefix, node);
1060         prefix_new = container_of(node_new, struct device_prefix, node);
1061
1062         struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1063         if (tree && (!node_new || !node_old))
1064                 ip->iface->updated |= IUF_PREFIX;
1065
1066         struct device_route route;
1067         memset(&route, 0, sizeof(route));
1068         route.flags = DEVADDR_INET6;
1069         route.metric = INT32_MAX;
1070         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1071         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1072
1073
1074         struct device_prefix_assignment *c;
1075         struct interface *iface;
1076
1077         if (node_old && node_new) {
1078                 // Move assignments and refresh addresses to update valid times
1079                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1080
1081                 list_for_each_entry(c, &prefix_new->assignments, head)
1082                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1083                                 interface_set_prefix_address(c, prefix_new, iface, true);
1084
1085                 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1086                                 prefix_new->valid_until != prefix_old->valid_until)
1087                         ip->iface->updated |= IUF_PREFIX;
1088         } else if (node_new) {
1089                 // Set null-route to avoid routing loops
1090                 system_add_route(NULL, &route);
1091
1092                 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1093                         interface_update_prefix_assignments(prefix_new, true);
1094         } else if (node_old) {
1095                 // Remove null-route
1096                 interface_update_prefix_assignments(prefix_old, false);
1097                 system_del_route(NULL, &route);
1098         }
1099
1100         if (node_old) {
1101                 if (prefix_old->head.next)
1102                         list_del(&prefix_old->head);
1103                 free(prefix_old);
1104         }
1105
1106         if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1107                 list_add(&prefix_new->head, &prefixes);
1108
1109 }
1110
1111 struct device_prefix*
1112 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1113                 uint8_t length, time_t valid_until, time_t preferred_until,
1114                 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1115 {
1116         if (!pclass)
1117                 pclass = (iface) ? iface->name : "local";
1118
1119         struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1120         if (!prefix)
1121                 return NULL;
1122
1123         prefix->length = length;
1124         prefix->addr = *addr;
1125         prefix->preferred_until = preferred_until;
1126         prefix->valid_until = valid_until;
1127         prefix->iface = iface;
1128         INIT_LIST_HEAD(&prefix->assignments);
1129
1130         if (excl_addr) {
1131                 prefix->excl_addr = *excl_addr;
1132                 prefix->excl_length = excl_length;
1133         }
1134
1135         strcpy(prefix->pclass, pclass);
1136
1137         if (iface)
1138                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1139         else
1140                 interface_update_prefix(NULL, &prefix->node, NULL);
1141
1142         return prefix;
1143 }
1144
1145 void
1146 interface_ip_set_ula_prefix(const char *prefix)
1147 {
1148         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1149         if (prefix)
1150                 strncpy(buf, prefix, sizeof(buf) - 1);
1151         char *prefixaddr = strtok_r(buf, "/", &saveptr);
1152
1153         struct in6_addr addr;
1154         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1155                 if (ula_prefix) {
1156                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1157                         ula_prefix = NULL;
1158                 }
1159                 return;
1160         }
1161
1162         int length;
1163         char *prefixlen = strtok_r(NULL, ",", &saveptr);
1164         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1165                 return;
1166
1167         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1168                         ula_prefix->length != length) {
1169                 if (ula_prefix)
1170                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1171
1172                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1173                                 0, 0, NULL, 0, NULL);
1174         }
1175 }
1176
1177 void
1178 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1179 {
1180         struct dns_server *s;
1181
1182         s = calloc(1, sizeof(*s));
1183         if (!s)
1184                 return;
1185
1186         s->af = AF_INET;
1187         if (inet_pton(s->af, str, &s->addr.in))
1188                 goto add;
1189
1190         s->af = AF_INET6;
1191         if (inet_pton(s->af, str, &s->addr.in))
1192                 goto add;
1193
1194         free(s);
1195         return;
1196
1197 add:
1198         D(INTERFACE, "Add IPv%c DNS server: %s\n",
1199           s->af == AF_INET6 ? '6' : '4', str);
1200         vlist_simple_add(&ip->dns_servers, &s->node);
1201 }
1202
1203 void
1204 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1205 {
1206         struct blob_attr *cur;
1207         int rem;
1208
1209         blobmsg_for_each_attr(cur, list, rem) {
1210                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1211                         continue;
1212
1213                 if (!blobmsg_check_attr(cur, NULL))
1214                         continue;
1215
1216                 interface_add_dns_server(ip, blobmsg_data(cur));
1217         }
1218 }
1219
1220 static void
1221 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1222 {
1223         struct dns_search_domain *s;
1224         int len = strlen(str);
1225
1226         s = calloc(1, sizeof(*s) + len + 1);
1227         if (!s)
1228                 return;
1229
1230         D(INTERFACE, "Add DNS search domain: %s\n", str);
1231         memcpy(s->name, str, len);
1232         vlist_simple_add(&ip->dns_search, &s->node);
1233 }
1234
1235 void
1236 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1237 {
1238         struct blob_attr *cur;
1239         int rem;
1240
1241         blobmsg_for_each_attr(cur, list, rem) {
1242                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1243                         continue;
1244
1245                 if (!blobmsg_check_attr(cur, NULL))
1246                         continue;
1247
1248                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1249         }
1250 }
1251
1252 static void
1253 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1254 {
1255         struct dns_server *s;
1256         struct dns_search_domain *d;
1257         const char *str;
1258         char buf[INET6_ADDRSTRLEN];
1259
1260         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1261                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1262                 if (!str)
1263                         continue;
1264
1265                 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1266                         fprintf(f, "nameserver %s%%%s\n", str, dev);
1267                 else
1268                         fprintf(f, "nameserver %s\n", str);
1269         }
1270
1271         vlist_simple_for_each_element(&ip->dns_search, d, node) {
1272                 fprintf(f, "search %s\n", d->name);
1273         }
1274 }
1275
1276 /* Sorting of interface resolver entries :               */
1277 /* Primary on interface dns_metric : lowest metric first */
1278 /* Secondary on interface metric : lowest metric first   */
1279 /* Finally alphabetical order of interface names         */
1280 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1281 {
1282         const struct interface *iface1 = k1, *iface2 = k2;
1283
1284         if (iface1->dns_metric != iface2->dns_metric)
1285                 return iface1->dns_metric - iface2->dns_metric;
1286
1287         if (iface1->metric != iface2->metric)
1288                 return iface1->metric - iface2->metric;
1289
1290         return strcmp(iface1->name, iface2->name);
1291 }
1292
1293 static void
1294 __interface_write_dns_entries(FILE *f)
1295 {
1296         struct interface *iface;
1297         struct {
1298                 struct avl_node node;
1299         } *entry, *n_entry;
1300         struct avl_tree resolv_conf_iface_entries;
1301
1302         avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1303
1304         vlist_for_each_element(&interfaces, iface, node) {
1305                 if (iface->state != IFS_UP)
1306                         continue;
1307
1308                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1309                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1310                     vlist_simple_empty(&iface->config_ip.dns_search) &&
1311                     vlist_simple_empty(&iface->config_ip.dns_servers))
1312                         continue;
1313
1314                 entry = calloc(1, sizeof(*entry));
1315                 if (!entry)
1316                         continue;
1317
1318                 entry->node.key = iface;
1319                 avl_insert(&resolv_conf_iface_entries, &entry->node);
1320         }
1321
1322         avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1323                 iface = (struct interface *)entry->node.key;
1324                 struct device *dev = iface->l3_dev.dev;
1325
1326                 fprintf(f, "# Interface %s\n", iface->name);
1327
1328                 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1329
1330                 if (!iface->proto_ip.no_dns)
1331                         write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1332         }
1333
1334         avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1335                 free(entry);
1336 }
1337
1338 void
1339 interface_write_resolv_conf(void)
1340 {
1341         char *path = alloca(strlen(resolv_conf) + 5);
1342         FILE *f;
1343         uint32_t crcold, crcnew;
1344
1345         sprintf(path, "%s.tmp", resolv_conf);
1346         unlink(path);
1347         f = fopen(path, "w+");
1348         if (!f) {
1349                 D(INTERFACE, "Failed to open %s for writing\n", path);
1350                 return;
1351         }
1352
1353         __interface_write_dns_entries(f);
1354
1355         fflush(f);
1356         rewind(f);
1357         crcnew = crc32_file(f);
1358         fclose(f);
1359
1360         crcold = crcnew + 1;
1361         f = fopen(resolv_conf, "r");
1362         if (f) {
1363                 crcold = crc32_file(f);
1364                 fclose(f);
1365         }
1366
1367         if (crcold == crcnew) {
1368                 unlink(path);
1369         } else if (rename(path, resolv_conf) < 0) {
1370                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1371                 unlink(path);
1372         }
1373 }
1374
1375 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1376 {
1377         struct device_addr *addr;
1378         struct device_route *route;
1379         struct device *dev;
1380         struct interface *iface;
1381
1382         ip->enabled = enabled;
1383         iface = ip->iface;
1384         dev = iface->l3_dev.dev;
1385         if (!dev)
1386                 return;
1387
1388         vlist_for_each_element(&ip->addr, addr, node) {
1389                 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1390
1391                 if (addr->flags & DEVADDR_EXTERNAL)
1392                         continue;
1393
1394                 if (addr->enabled == enabled)
1395                         continue;
1396
1397                 if (enabled) {
1398                         system_add_address(dev, addr);
1399
1400                         addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1401                         if (iface->metric || addr->policy_table)
1402                                 interface_handle_subnet_route(iface, addr, true);
1403
1404                         if (addr->policy_table)
1405                                 interface_add_addr_rules(addr, true);
1406                 } else {
1407                         interface_handle_subnet_route(iface, addr, false);
1408                         system_del_address(dev, addr);
1409
1410                         if (addr->policy_table)
1411                                 interface_add_addr_rules(addr, false);
1412                 }
1413                 addr->enabled = enabled;
1414         }
1415
1416         vlist_for_each_element(&ip->route, route, node) {
1417                 bool _enabled = enabled;
1418
1419                 if (route->flags & DEVADDR_EXTERNAL)
1420                         continue;
1421
1422                 if (!enable_route(ip, route))
1423                         _enabled = false;
1424
1425                 if (route->enabled == _enabled)
1426                         continue;
1427
1428                 if (_enabled) {
1429                         interface_set_route_info(ip->iface, route);
1430
1431                         if (system_add_route(dev, route))
1432                                 route->failed = true;
1433                 } else
1434                         system_del_route(dev, route);
1435                 route->enabled = _enabled;
1436         }
1437
1438         struct device_prefix *c;
1439         struct device_prefix_assignment *a;
1440         list_for_each_entry(c, &prefixes, head)
1441                 list_for_each_entry(a, &c->assignments, head)
1442                         if (!strcmp(a->name, ip->iface->name))
1443                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1444
1445         if (ip->iface && ip->iface->policy_rules_set != enabled &&
1446             ip->iface->l3_dev.dev) {
1447                 set_ip_lo_policy(enabled, true, ip->iface);
1448                 set_ip_lo_policy(enabled, false, ip->iface);
1449
1450                 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1451                         NULL, 0, 0, ip->iface, "failed_policy", true);
1452                 ip->iface->policy_rules_set = enabled;
1453         }
1454 }
1455
1456 void
1457 interface_ip_update_start(struct interface_ip_settings *ip)
1458 {
1459         if (ip != &ip->iface->config_ip) {
1460                 vlist_simple_update(&ip->dns_servers);
1461                 vlist_simple_update(&ip->dns_search);
1462         }
1463         vlist_update(&ip->route);
1464         vlist_update(&ip->addr);
1465         vlist_update(&ip->prefix);
1466 }
1467
1468 void
1469 interface_ip_update_complete(struct interface_ip_settings *ip)
1470 {
1471         vlist_simple_flush(&ip->dns_servers);
1472         vlist_simple_flush(&ip->dns_search);
1473         vlist_flush(&ip->route);
1474         vlist_flush(&ip->addr);
1475         vlist_flush(&ip->prefix);
1476         interface_write_resolv_conf();
1477 }
1478
1479 void
1480 interface_ip_flush(struct interface_ip_settings *ip)
1481 {
1482         if (ip == &ip->iface->proto_ip)
1483                 vlist_flush_all(&ip->iface->host_routes);
1484         vlist_simple_flush_all(&ip->dns_servers);
1485         vlist_simple_flush_all(&ip->dns_search);
1486         vlist_flush_all(&ip->route);
1487         vlist_flush_all(&ip->addr);
1488         vlist_flush_all(&ip->prefix);
1489 }
1490
1491 static void
1492 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1493 {
1494         ip->iface = iface;
1495         ip->enabled = true;
1496         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1497         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1498         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1499         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1500         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1501 }
1502
1503 void
1504 interface_ip_init(struct interface *iface)
1505 {
1506         __interface_ip_init(&iface->proto_ip, iface);
1507         __interface_ip_init(&iface->config_ip, iface);
1508         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1509 }
1510
1511 static void
1512 interface_ip_valid_until_handler(struct uloop_timeout *t)
1513 {
1514         time_t now = system_get_rtime();
1515         struct interface *iface;
1516         vlist_for_each_element(&interfaces, iface, node) {
1517                 if (iface->state != IFS_UP)
1518                         continue;
1519
1520                 struct device_addr *addr, *addrp;
1521                 struct device_route *route, *routep;
1522                 struct device_prefix *pref, *prefp;
1523
1524                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1525                         if (addr->valid_until && addr->valid_until < now)
1526                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1527
1528                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1529                         if (route->valid_until && route->valid_until < now)
1530                                 vlist_delete(&iface->proto_ip.route, &route->node);
1531
1532                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1533                         if (pref->valid_until && pref->valid_until < now)
1534                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1535
1536         }
1537
1538         uloop_timeout_set(t, 1000);
1539 }
1540
1541 static void __init
1542 interface_ip_init_worker(void)
1543 {
1544         valid_until_timeout.cb = interface_ip_valid_until_handler;
1545         uloop_timeout_set(&valid_until_timeout, 1000);
1546 }