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                         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 void
 715 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
 716 {
 717         /* get mac address */
 718         uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
 719         uint8_t *ifaceid = addr->s6_addr + 8;
 720         memcpy(ifaceid,macaddr,3);
 721         memcpy(ifaceid + 5,macaddr + 3, 3);
 722         ifaceid[3] = 0xff;
 723         ifaceid[4] = 0xfe;
 724         ifaceid[0] ^= 0x02;
 725 }
 726
 727 static void
 728 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
 729 {
 730         /* generate new iface id */
 731         switch (iface->assignment_iface_id_selection) {
 732         case IFID_FIXED:
 733                 /* fixed */
 734                 /* copy host part from assignment_fixed_iface_id */
 735                 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
 736                 break;
 737         case IFID_RANDOM:
 738                 /* randomize last 64 bits */
 739                 random_ifaceid(addr);
 740                 break;
 741         case IFID_EUI64:
 742                 /* eui64 */
 743                 eui64_ifaceid(iface, addr);
 744                 break;
 745         }
 746 }
 747
 748 static void
 749 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 750                 const struct device_prefix *prefix, struct interface *iface, bool add)
 751 {
 752         const struct interface *uplink = prefix->iface;
 753         if (!iface->l3_dev.dev)
 754                 return;
 755
 756         struct device *l3_downlink = iface->l3_dev.dev;
 757
 758         struct device_addr addr;
 759         struct device_route route;
 760         memset(&addr, 0, sizeof(addr));
 761         memset(&route, 0, sizeof(route));
 762
 763         if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
 764                 addr.addr.in6 = prefix->addr;
 765                 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 766                 generate_ifaceid(iface, &addr.addr.in6);
 767                 assignment->addr = addr.addr.in6;
 768         }
 769         else
 770                 addr.addr.in6 = assignment->addr;
 771
 772         addr.mask = assignment->length;
 773         addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
 774         addr.preferred_until = prefix->preferred_until;
 775         addr.valid_until = prefix->valid_until;
 776
 777         route.flags = DEVADDR_INET6;
 778         route.mask = addr.mask < 64 ? 64 : addr.mask;
 779         route.addr = addr.addr;
 780         clear_if_addr(&route.addr, route.mask);
 781         interface_set_route_info(iface, &route);
 782
 783         if (!add && assignment->enabled) {
 784                 time_t now = system_get_rtime();
 785                 addr.preferred_until = now;
 786                 if (!addr.valid_until || addr.valid_until - now > 7200)
 787                         addr.valid_until = now + 7200;
 788
 789                 if (prefix->iface) {
 790                         if (prefix->iface->ip6table)
 791                                 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
 792                                                 addr.mask, prefix->iface->ip6table, iface, NULL, true);
 793
 794                         set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 795                                                         addr.mask, 0, iface, "unreachable", true);
 796                 }
 797
 798                 system_del_route(l3_downlink, &route);
 799                 system_add_address(l3_downlink, &addr);
 800
 801                 assignment->enabled = false;
 802         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
 803                         !system_add_address(l3_downlink, &addr)) {
 804
 805                 if (prefix->iface && !assignment->enabled) {
 806                         set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 807                                         addr.mask, 0, iface, "unreachable", true);
 808
 809                         if (prefix->iface->ip6table)
 810                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
 811                                                 addr.mask, prefix->iface->ip6table, iface, NULL, true);
 812                 }
 813
 814                 route.metric = iface->metric;
 815                 system_add_route(l3_downlink, &route);
 816
 817                 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
 818                         int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
 819                         int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
 820
 821                         if (mtu > 0 && mtu_old > mtu)
 822                                 system_update_ipv6_mtu(l3_downlink, mtu);
 823                 }
 824
 825                 assignment->enabled = true;
 826         }
 827 }
 828
 829 static bool interface_prefix_assign(struct list_head *list,
 830                 struct device_prefix_assignment *assign)
 831 {
 832         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 833         struct device_prefix_assignment *c;
 834         list_for_each_entry(c, list, head) {
 835                 if (assign->assigned != -1) {
 836                         if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
 837                                 list_add_tail(&assign->head, &c->head);
 838                                 return true;
 839                         }
 840                 } else if (assign->assigned == -1) {
 841                         current = (current + asize) & (~asize);
 842                         if (current + asize < c->assigned) {
 843                                 assign->assigned = current;
 844                                 list_add_tail(&assign->head, &c->head);
 845                                 return true;
 846                         }
 847                 }
 848                 current = (c->assigned + (1 << (64 - c->length)));
 849         }
 850         return false;
 851 }
 852
 853 /*
 854  * Sorting of assignment entries:
 855  * Primary on assignment length: smallest assignment first
 856  * Secondary on assignment weight: highest weight first
 857  * Finally alphabetical order of interface names
 858  */
 859 static int prefix_assignment_cmp(const void *k1, const void *k2, void *ptr)
 860 {
 861         const struct device_prefix_assignment *a1 = k1, *a2 = k2;
 862
 863         if (a1->length != a2->length)
 864                 return a1->length - a2->length;
 865
 866         if (a1->weight != a2->weight)
 867                 return a2->weight - a1->weight;
 868
 869         return strcmp(a1->name, a2->name);
 870 }
 871
 872 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 873 {
 874         struct device_prefix_assignment *c;
 875         struct interface *iface;
 876
 877         // Delete all assignments
 878         while (!list_empty(&prefix->assignments)) {
 879                 c = list_first_entry(&prefix->assignments,
 880                                 struct device_prefix_assignment, head);
 881                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 882                         interface_set_prefix_address(c, prefix, iface, false);
 883                 list_del(&c->head);
 884                 free(c);
 885         }
 886
 887         if (!setup)
 888                 return;
 889
 890         // End-of-assignment sentinel
 891         c = malloc(sizeof(*c) + 1);
 892         if (!c)
 893                 return;
 894
 895         c->assigned = 1 << (64 - prefix->length);
 896         c->length = 64;
 897         c->name[0] = 0;
 898         c->addr = in6addr_any;
 899         list_add(&c->head, &prefix->assignments);
 900
 901         // Excluded prefix
 902         if (prefix->excl_length > 0) {
 903                 const char name[] = "!excluded";
 904                 c = malloc(sizeof(*c) + sizeof(name));
 905                 if (c) {
 906                         c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 907                                         ((1 << (64 - prefix->length)) - 1);
 908                         c->length = prefix->excl_length;
 909                         c->addr = in6addr_any;
 910                         memcpy(c->name, name, sizeof(name));
 911                         list_add(&c->head, &prefix->assignments);
 912                 }
 913         }
 914
 915         bool assigned_any = false;
 916         struct {
 917                 struct avl_node node;
 918         } *entry, *n_entry;
 919         struct avl_tree assign_later;
 920
 921         avl_init(&assign_later, prefix_assignment_cmp, false, NULL);
 922
 923         vlist_for_each_element(&interfaces, iface, node) {
 924                 if (iface->assignment_length < 48 ||
 925                                 iface->assignment_length > 64)
 926                         continue;
 927
 928                 // Test whether there is a matching class
 929                 if (!list_empty(&iface->assignment_classes)) {
 930                         bool found = false;
 931
 932                         struct interface_assignment_class *c;
 933                         list_for_each_entry(c, &iface->assignment_classes, head) {
 934                                 if (!strcmp(c->name, prefix->pclass)) {
 935                                         found = true;
 936                                         break;
 937                                 }
 938                         }
 939
 940                         if (!found)
 941                                 continue;
 942                 }
 943
 944                 size_t namelen = strlen(iface->name) + 1;
 945                 c = malloc(sizeof(*c) + namelen);
 946                 if (!c)
 947                         continue;
 948
 949                 c->length = iface->assignment_length;
 950                 c->assigned = iface->assignment_hint;
 951                 c->weight = iface->assignment_weight;
 952                 c->addr = in6addr_any;
 953                 c->enabled = false;
 954                 memcpy(c->name, iface->name, namelen);
 955
 956                 // First process all custom assignments, put all others in later-list
 957                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 958                         if (c->assigned != -1) {
 959                                 c->assigned = -1;
 960                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 961                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 962                         }
 963
 964                         entry = calloc(1, sizeof(*entry));
 965                         if (!entry)
 966                                 continue;
 967
 968                         entry->node.key = c;
 969                         avl_insert(&assign_later, &entry->node);
 970                 }
 971
 972                 if (c->assigned != -1)
 973                         assigned_any = true;
 974         }
 975
 976         /* Then try to assign all other + failed custom assignments */
 977         avl_for_each_element_safe(&assign_later, entry, node, n_entry) {
 978                 bool assigned = false;
 979
 980                 c = (struct device_prefix_assignment *)entry->node.key;
 981                 avl_delete(&assign_later, &entry->node);
 982
 983                 do {
 984                         assigned = interface_prefix_assign(&prefix->assignments, c);
 985                 } while (!assigned && ++c->length <= 64);
 986
 987                 if (!assigned) {
 988                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 989                                         "of size %hhu for %s\n", c->length, c->name);
 990                         free(c);
 991                 } else
 992                         assigned_any = true;
 993
 994                 free(entry);
 995         }
 996
 997         list_for_each_entry(c, &prefix->assignments, head)
 998                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 999                         interface_set_prefix_address(c, prefix, iface, true);
1000
1001         if (!assigned_any)
1002                 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
1003                                 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
1004 }
1005
1006
1007 void interface_refresh_assignments(bool hint)
1008 {
1009         static bool refresh = false;
1010         if (!hint && refresh) {
1011                 struct device_prefix *p;
1012                 list_for_each_entry(p, &prefixes, head)
1013                         interface_update_prefix_assignments(p, true);
1014         }
1015         refresh = hint;
1016 }
1017
1018
1019 static void
1020 interface_update_prefix(struct vlist_tree *tree,
1021                              struct vlist_node *node_new,
1022                              struct vlist_node *node_old)
1023 {
1024         struct device_prefix *prefix_old, *prefix_new;
1025         prefix_old = container_of(node_old, struct device_prefix, node);
1026         prefix_new = container_of(node_new, struct device_prefix, node);
1027
1028         struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
1029         if (tree && (!node_new || !node_old))
1030                 ip->iface->updated |= IUF_PREFIX;
1031
1032         struct device_route route;
1033         memset(&route, 0, sizeof(route));
1034         route.flags = DEVADDR_INET6;
1035         route.metric = INT32_MAX;
1036         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
1037         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
1038
1039
1040         struct device_prefix_assignment *c;
1041         struct interface *iface;
1042
1043         if (node_old && node_new) {
1044                 // Move assignments and refresh addresses to update valid times
1045                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
1046
1047                 list_for_each_entry(c, &prefix_new->assignments, head)
1048                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
1049                                 interface_set_prefix_address(c, prefix_new, iface, true);
1050
1051                 if (prefix_new->preferred_until != prefix_old->preferred_until ||
1052                                 prefix_new->valid_until != prefix_old->valid_until)
1053                         ip->iface->updated |= IUF_PREFIX;
1054         } else if (node_new) {
1055                 // Set null-route to avoid routing loops
1056                 system_add_route(NULL, &route);
1057
1058                 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
1059                         interface_update_prefix_assignments(prefix_new, true);
1060         } else if (node_old) {
1061                 // Remove null-route
1062                 interface_update_prefix_assignments(prefix_old, false);
1063                 system_del_route(NULL, &route);
1064         }
1065
1066         if (node_old) {
1067                 if (prefix_old->head.next)
1068                         list_del(&prefix_old->head);
1069                 free(prefix_old);
1070         }
1071
1072         if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
1073                 list_add(&prefix_new->head, &prefixes);
1074
1075 }
1076
1077 struct device_prefix*
1078 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
1079                 uint8_t length, time_t valid_until, time_t preferred_until,
1080                 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
1081 {
1082         if (!pclass)
1083                 pclass = (iface) ? iface->name : "local";
1084
1085         struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
1086         if (!prefix)
1087                 return NULL;
1088
1089         prefix->length = length;
1090         prefix->addr = *addr;
1091         prefix->preferred_until = preferred_until;
1092         prefix->valid_until = valid_until;
1093         prefix->iface = iface;
1094         INIT_LIST_HEAD(&prefix->assignments);
1095
1096         if (excl_addr) {
1097                 prefix->excl_addr = *excl_addr;
1098                 prefix->excl_length = excl_length;
1099         }
1100
1101         strcpy(prefix->pclass, pclass);
1102
1103         if (iface)
1104                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1105         else
1106                 interface_update_prefix(NULL, &prefix->node, NULL);
1107
1108         return prefix;
1109 }
1110
1111 void
1112 interface_ip_set_ula_prefix(const char *prefix)
1113 {
1114         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1115         if (prefix)
1116                 strncpy(buf, prefix, sizeof(buf) - 1);
1117         char *prefixaddr = strtok_r(buf, "/", &saveptr);
1118
1119         struct in6_addr addr;
1120         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1121                 if (ula_prefix) {
1122                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1123                         ula_prefix = NULL;
1124                 }
1125                 return;
1126         }
1127
1128         int length;
1129         char *prefixlen = strtok_r(NULL, ",", &saveptr);
1130         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1131                 return;
1132
1133         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1134                         ula_prefix->length != length) {
1135                 if (ula_prefix)
1136                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
1137
1138                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1139                                 0, 0, NULL, 0, NULL);
1140         }
1141 }
1142
1143 void
1144 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1145 {
1146         struct dns_server *s;
1147
1148         s = calloc(1, sizeof(*s));
1149         if (!s)
1150                 return;
1151
1152         s->af = AF_INET;
1153         if (inet_pton(s->af, str, &s->addr.in))
1154                 goto add;
1155
1156         s->af = AF_INET6;
1157         if (inet_pton(s->af, str, &s->addr.in))
1158                 goto add;
1159
1160         free(s);
1161         return;
1162
1163 add:
1164         D(INTERFACE, "Add IPv%c DNS server: %s\n",
1165           s->af == AF_INET6 ? '6' : '4', str);
1166         vlist_simple_add(&ip->dns_servers, &s->node);
1167 }
1168
1169 void
1170 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1171 {
1172         struct blob_attr *cur;
1173         int rem;
1174
1175         blobmsg_for_each_attr(cur, list, rem) {
1176                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1177                         continue;
1178
1179                 if (!blobmsg_check_attr(cur, NULL))
1180                         continue;
1181
1182                 interface_add_dns_server(ip, blobmsg_data(cur));
1183         }
1184 }
1185
1186 static void
1187 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1188 {
1189         struct dns_search_domain *s;
1190         int len = strlen(str);
1191
1192         s = calloc(1, sizeof(*s) + len + 1);
1193         if (!s)
1194                 return;
1195
1196         D(INTERFACE, "Add DNS search domain: %s\n", str);
1197         memcpy(s->name, str, len);
1198         vlist_simple_add(&ip->dns_search, &s->node);
1199 }
1200
1201 void
1202 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1203 {
1204         struct blob_attr *cur;
1205         int rem;
1206
1207         blobmsg_for_each_attr(cur, list, rem) {
1208                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1209                         continue;
1210
1211                 if (!blobmsg_check_attr(cur, NULL))
1212                         continue;
1213
1214                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1215         }
1216 }
1217
1218 static void
1219 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1220 {
1221         struct dns_server *s;
1222         struct dns_search_domain *d;
1223         const char *str;
1224         char buf[INET6_ADDRSTRLEN];
1225
1226         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1227                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1228                 if (!str)
1229                         continue;
1230
1231                 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1232                         fprintf(f, "nameserver %s%%%s\n", str, dev);
1233                 else
1234                         fprintf(f, "nameserver %s\n", str);
1235         }
1236
1237         vlist_simple_for_each_element(&ip->dns_search, d, node) {
1238                 fprintf(f, "search %s\n", d->name);
1239         }
1240 }
1241
1242 /* Sorting of interface resolver entries :               */
1243 /* Primary on interface dns_metric : lowest metric first */
1244 /* Secondary on interface metric : lowest metric first   */
1245 /* Finally alphabetical order of interface names         */
1246 static int resolv_conf_iface_cmp(const void *k1, const void *k2, void *ptr)
1247 {
1248         const struct interface *iface1 = k1, *iface2 = k2;
1249
1250         if (iface1->dns_metric != iface2->dns_metric)
1251                 return iface1->dns_metric - iface2->dns_metric;
1252
1253         if (iface1->metric != iface2->metric)
1254                 return iface1->metric - iface2->metric;
1255
1256         return strcmp(iface1->name, iface2->name);
1257 }
1258
1259 static void
1260 __interface_write_dns_entries(FILE *f)
1261 {
1262         struct interface *iface;
1263         struct {
1264                 struct avl_node node;
1265         } *entry, *n_entry;
1266         struct avl_tree resolv_conf_iface_entries;
1267
1268         avl_init(&resolv_conf_iface_entries, resolv_conf_iface_cmp, false, NULL);
1269
1270         vlist_for_each_element(&interfaces, iface, node) {
1271                 if (iface->state != IFS_UP)
1272                         continue;
1273
1274                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1275                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1276                     vlist_simple_empty(&iface->config_ip.dns_search) &&
1277                     vlist_simple_empty(&iface->config_ip.dns_servers))
1278                         continue;
1279
1280                 entry = calloc(1, sizeof(*entry));
1281                 if (!entry)
1282                         continue;
1283
1284                 entry->node.key = iface;
1285                 avl_insert(&resolv_conf_iface_entries, &entry->node);
1286         }
1287
1288         avl_for_each_element(&resolv_conf_iface_entries, entry, node) {
1289                 iface = (struct interface *)entry->node.key;
1290                 struct device *dev = iface->l3_dev.dev;
1291
1292                 fprintf(f, "# Interface %s\n", iface->name);
1293
1294                 write_resolv_conf_entries(f, &iface->config_ip, dev->ifname);
1295
1296                 if (!iface->proto_ip.no_dns)
1297                         write_resolv_conf_entries(f, &iface->proto_ip, dev->ifname);
1298         }
1299
1300         avl_remove_all_elements(&resolv_conf_iface_entries, entry, node, n_entry)
1301                 free(entry);
1302 }
1303
1304 void
1305 interface_write_resolv_conf(void)
1306 {
1307         char *path = alloca(strlen(resolv_conf) + 5);
1308         FILE *f;
1309         uint32_t crcold, crcnew;
1310
1311         sprintf(path, "%s.tmp", resolv_conf);
1312         unlink(path);
1313         f = fopen(path, "w+");
1314         if (!f) {
1315                 D(INTERFACE, "Failed to open %s for writing\n", path);
1316                 return;
1317         }
1318
1319         __interface_write_dns_entries(f);
1320
1321         fflush(f);
1322         rewind(f);
1323         crcnew = crc32_file(f);
1324         fclose(f);
1325
1326         crcold = crcnew + 1;
1327         f = fopen(resolv_conf, "r");
1328         if (f) {
1329                 crcold = crc32_file(f);
1330                 fclose(f);
1331         }
1332
1333         if (crcold == crcnew) {
1334                 unlink(path);
1335         } else if (rename(path, resolv_conf) < 0) {
1336                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1337                 unlink(path);
1338         }
1339 }
1340
1341 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1342 {
1343         struct device_addr *addr;
1344         struct device_route *route;
1345         struct device *dev;
1346         struct interface *iface;
1347
1348         ip->enabled = enabled;
1349         iface = ip->iface;
1350         dev = iface->l3_dev.dev;
1351         if (!dev)
1352                 return;
1353
1354         vlist_for_each_element(&ip->addr, addr, node) {
1355                 bool v6 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ? true : false;
1356
1357                 if (addr->flags & DEVADDR_EXTERNAL)
1358                         continue;
1359
1360                 if (addr->enabled == enabled)
1361                         continue;
1362
1363                 if (enabled) {
1364                         system_add_address(dev, addr);
1365
1366                         addr->policy_table = (v6) ? iface->ip6table : iface->ip4table;
1367                         if (iface->metric || addr->policy_table)
1368                                 interface_handle_subnet_route(iface, addr, true);
1369
1370                         if (addr->policy_table)
1371                                 interface_add_addr_rules(addr, true);
1372                 } else {
1373                         interface_handle_subnet_route(iface, addr, false);
1374                         system_del_address(dev, addr);
1375
1376                         if (addr->policy_table)
1377                                 interface_add_addr_rules(addr, false);
1378                 }
1379                 addr->enabled = enabled;
1380         }
1381
1382         vlist_for_each_element(&ip->route, route, node) {
1383                 bool _enabled = enabled;
1384
1385                 if (route->flags & DEVADDR_EXTERNAL)
1386                         continue;
1387
1388                 if (!enable_route(ip, route))
1389                         _enabled = false;
1390
1391                 if (route->enabled == _enabled)
1392                         continue;
1393
1394                 if (_enabled) {
1395                         interface_set_route_info(ip->iface, route);
1396
1397                         if (system_add_route(dev, route))
1398                                 route->failed = true;
1399                 } else
1400                         system_del_route(dev, route);
1401                 route->enabled = _enabled;
1402         }
1403
1404         struct device_prefix *c;
1405         struct device_prefix_assignment *a;
1406         list_for_each_entry(c, &prefixes, head)
1407                 list_for_each_entry(a, &c->assignments, head)
1408                         if (!strcmp(a->name, ip->iface->name))
1409                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1410
1411         if (ip->iface && ip->iface->policy_rules_set != enabled &&
1412             ip->iface->l3_dev.dev) {
1413                 set_ip_lo_policy(enabled, true, ip->iface);
1414                 set_ip_lo_policy(enabled, false, ip->iface);
1415
1416                 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1417                         NULL, 0, 0, ip->iface, "failed_policy", true);
1418                 ip->iface->policy_rules_set = enabled;
1419         }
1420 }
1421
1422 void
1423 interface_ip_update_start(struct interface_ip_settings *ip)
1424 {
1425         if (ip != &ip->iface->config_ip) {
1426                 vlist_simple_update(&ip->dns_servers);
1427                 vlist_simple_update(&ip->dns_search);
1428         }
1429         vlist_update(&ip->route);
1430         vlist_update(&ip->addr);
1431         vlist_update(&ip->prefix);
1432 }
1433
1434 void
1435 interface_ip_update_complete(struct interface_ip_settings *ip)
1436 {
1437         vlist_simple_flush(&ip->dns_servers);
1438         vlist_simple_flush(&ip->dns_search);
1439         vlist_flush(&ip->route);
1440         vlist_flush(&ip->addr);
1441         vlist_flush(&ip->prefix);
1442         interface_write_resolv_conf();
1443 }
1444
1445 void
1446 interface_ip_flush(struct interface_ip_settings *ip)
1447 {
1448         if (ip == &ip->iface->proto_ip)
1449                 vlist_flush_all(&ip->iface->host_routes);
1450         vlist_simple_flush_all(&ip->dns_servers);
1451         vlist_simple_flush_all(&ip->dns_search);
1452         vlist_flush_all(&ip->route);
1453         vlist_flush_all(&ip->addr);
1454         vlist_flush_all(&ip->prefix);
1455 }
1456
1457 static void
1458 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1459 {
1460         ip->iface = iface;
1461         ip->enabled = true;
1462         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1463         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1464         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1465         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1466         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1467 }
1468
1469 void
1470 interface_ip_init(struct interface *iface)
1471 {
1472         __interface_ip_init(&iface->proto_ip, iface);
1473         __interface_ip_init(&iface->config_ip, iface);
1474         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1475 }
1476
1477 static void
1478 interface_ip_valid_until_handler(struct uloop_timeout *t)
1479 {
1480         time_t now = system_get_rtime();
1481         struct interface *iface;
1482         vlist_for_each_element(&interfaces, iface, node) {
1483                 if (iface->state != IFS_UP)
1484                         continue;
1485
1486                 struct device_addr *addr, *addrp;
1487                 struct device_route *route, *routep;
1488                 struct device_prefix *pref, *prefp;
1489
1490                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1491                         if (addr->valid_until && addr->valid_until < now)
1492                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1493
1494                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1495                         if (route->valid_until && route->valid_until < now)
1496                                 vlist_delete(&iface->proto_ip.route, &route->node);
1497
1498                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1499                         if (pref->valid_until && pref->valid_until < now)
1500                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1501
1502         }
1503
1504         uloop_timeout_set(t, 1000);
1505 }
1506
1507 static void __init
1508 interface_ip_init_worker(void)
1509 {
1510         valid_until_timeout.cb = interface_ip_valid_until_handler;
1511         uloop_timeout_set(&valid_until_timeout, 1000);
1512 }