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