interface-ip.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <unistd.h>
  18
  19 #include <arpa/inet.h>
  20
  21 #include "netifd.h"
  22 #include "device.h"
  23 #include "interface.h"
  24 #include "interface-ip.h"
  25 #include "proto.h"
  26 #include "ubus.h"
  27 #include "system.h"
  28
  29 enum {
  30         ROUTE_INTERFACE,
  31         ROUTE_TARGET,
  32         ROUTE_MASK,
  33         ROUTE_GATEWAY,
  34         ROUTE_METRIC,
  35         ROUTE_MTU,
  36         ROUTE_VALID,
  37         ROUTE_TABLE,
  38         __ROUTE_MAX
  39 };
  40
  41 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  42         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  43         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  44         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  46         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  47         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  48         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  49         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  50 };
  51
  52 const struct config_param_list route_attr_list = {
  53         .n_params = __ROUTE_MAX,
  54         .params = route_attr,
  55 };
  56
  57
  58 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  59 static struct device_prefix *ula_prefix = NULL;
  60 static struct uloop_timeout valid_until_timeout;
  61
  62
  63 static void
  64 clear_if_addr(union if_addr *a, int mask)
  65 {
  66         int m_bytes = (mask + 7) / 8;
  67         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  68         uint8_t *p = (uint8_t *) a;
  69
  70         if (m_bytes < sizeof(a))
  71                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  72
  73         p[m_bytes - 1] &= ~m_clear;
  74 }
  75
  76 static bool
  77 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  78 {
  79         union if_addr *p1, *p2;
  80
  81         p1 = alloca(sizeof(*a1));
  82         p2 = alloca(sizeof(*a2));
  83
  84         memcpy(p1, a1, sizeof(*a1));
  85         clear_if_addr(p1, mask);
  86         memcpy(p2, a2, sizeof(*a2));
  87         clear_if_addr(p2, mask);
  88
  89         return !memcmp(p1, p2, sizeof(*p1));
  90 }
  91
  92 static bool
  93 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
  94 {
  95         struct device_addr *addr;
  96
  97         vlist_for_each_element(&ip->addr, addr, node) {
  98                 if (!addr->enabled)
  99                         continue;
 100
 101                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 102                         continue;
 103
 104                 if (!match_if_addr(&addr->addr, a, addr->mask))
 105                         continue;
 106
 107                 return true;
 108         }
 109
 110         return false;
 111 }
 112
 113 static void
 114 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 115                        bool v6, struct device_route **res)
 116 {
 117         struct device_route *route;
 118
 119         vlist_for_each_element(&ip->route, route, node) {
 120                 if (!route->enabled)
 121                         continue;
 122
 123                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 124                         continue;
 125
 126                 if (!match_if_addr(&route->addr, a, route->mask))
 127                         continue;
 128
 129                 if (route->flags & DEVROUTE_TABLE)
 130                         continue;
 131
 132                 if (!*res || route->mask < (*res)->mask)
 133                         *res = route;
 134         }
 135 }
 136
 137 static bool
 138 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 139 {
 140         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 141                __find_ip_addr_target(&iface->config_ip, a, v6);
 142 }
 143
 144 static void
 145 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 146                                bool v6, struct device_route **route)
 147 {
 148         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 149         __find_ip_route_target(&iface->config_ip, a, v6, route);
 150 }
 151
 152 struct interface *
 153 interface_ip_add_target_route(union if_addr *addr, bool v6)
 154 {
 155         struct interface *iface;
 156         struct device_route *route, *r_next = NULL;
 157         bool defaultroute_target = false;
 158         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 159
 160         route = calloc(1, sizeof(*route));
 161         if (!route)
 162                 return NULL;
 163
 164         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 165         route->mask = v6 ? 128 : 32;
 166         if (memcmp(&route->addr, addr, addrsize) == 0)
 167                 defaultroute_target = true;
 168         else
 169                 memcpy(&route->addr, addr, addrsize);
 170
 171         vlist_for_each_element(&interfaces, iface, node) {
 172                 /* look for locally addressable target first */
 173                 if (interface_ip_find_addr_target(iface, addr, v6))
 174                         goto done;
 175
 176                 /* do not stop at the first route, let the lookup compare
 177                  * masks to find the best match */
 178                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 179         }
 180
 181         if (!r_next) {
 182                 free(route);
 183                 return NULL;
 184         }
 185
 186         iface = r_next->iface;
 187         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 188         route->mtu = r_next->mtu;
 189         route->metric = r_next->metric;
 190
 191 done:
 192         route->iface = iface;
 193         if (defaultroute_target)
 194                 free(route);
 195         else
 196                 vlist_add(&iface->host_routes, &route->node, &route->flags);
 197         return iface;
 198 }
 199
 200 void
 201 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 202 {
 203         struct interface_ip_settings *ip;
 204         struct blob_attr *tb[__ROUTE_MAX], *cur;
 205         struct device_route *route;
 206         int af = v6 ? AF_INET6 : AF_INET;
 207
 208         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 209
 210         if (!iface) {
 211                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 212                         return;
 213
 214                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 215                 if (!iface)
 216                         return;
 217
 218                 ip = &iface->config_ip;
 219         } else {
 220                 ip = &iface->proto_ip;
 221         }
 222
 223         route = calloc(1, sizeof(*route));
 224         if (!route)
 225                 return;
 226
 227         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 228         route->mask = v6 ? 128 : 32;
 229         if ((cur = tb[ROUTE_MASK]) != NULL) {
 230                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 231                 if (route->mask > (v6 ? 128 : 32))
 232                         goto error;
 233         }
 234
 235         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 236                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 237                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 238                         goto error;
 239                 }
 240         }
 241
 242         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 243                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 244                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 245                         goto error;
 246                 }
 247         }
 248
 249         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 250                 route->metric = blobmsg_get_u32(cur);
 251                 route->flags |= DEVROUTE_METRIC;
 252         }
 253
 254         if ((cur = tb[ROUTE_MTU]) != NULL) {
 255                 route->mtu = blobmsg_get_u32(cur);
 256                 route->flags |= DEVROUTE_MTU;
 257         }
 258
 259         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 260                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 261                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 262                         goto error;
 263                 }
 264
 265                 if (route->table)
 266                         route->flags |= DEVROUTE_TABLE;
 267         }
 268
 269         if ((cur = tb[ROUTE_VALID]) != NULL)
 270                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 271
 272         vlist_add(&ip->route, &route->node, &route->flags);
 273         return;
 274
 275 error:
 276         free(route);
 277 }
 278
 279 static int
 280 addr_cmp(const void *k1, const void *k2, void *ptr)
 281 {
 282         return memcmp(k1, k2, sizeof(struct device_addr) -
 283                       offsetof(struct device_addr, flags));
 284 }
 285
 286 static int
 287 route_cmp(const void *k1, const void *k2, void *ptr)
 288 {
 289         return memcmp(k1, k2, sizeof(struct device_route) -
 290                       offsetof(struct device_route, flags));
 291 }
 292
 293 static int
 294 prefix_cmp(const void *k1, const void *k2, void *ptr)
 295 {
 296         return memcmp(k1, k2, sizeof(struct device_prefix) -
 297                         offsetof(struct device_prefix, addr));
 298 }
 299
 300 static void
 301 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 302 {
 303         struct device *dev = iface->l3_dev.dev;
 304         struct device_route route;
 305
 306         memset(&route, 0, sizeof(route));
 307         route.iface = iface;
 308         route.flags = addr->flags;
 309         route.mask = addr->mask;
 310         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 311         clear_if_addr(&route.addr, route.mask);
 312
 313         if (add) {
 314                 route.flags |= DEVADDR_KERNEL;
 315                 system_del_route(dev, &route);
 316
 317                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 318                         route.flags &= ~DEVADDR_KERNEL;
 319                         route.metric = iface->metric;
 320                         system_add_route(dev, &route);
 321                 }
 322         } else {
 323                 if (!(addr->flags & DEVADDR_OFFLINK))
 324                         system_del_route(dev, &route);
 325         }
 326 }
 327
 328 static void
 329 interface_update_proto_addr(struct vlist_tree *tree,
 330                             struct vlist_node *node_new,
 331                             struct vlist_node *node_old)
 332 {
 333         struct interface_ip_settings *ip;
 334         struct interface *iface;
 335         struct device *dev;
 336         struct device_addr *a_new = NULL, *a_old = NULL;
 337         bool keep = false;
 338
 339         ip = container_of(tree, struct interface_ip_settings, addr);
 340         iface = ip->iface;
 341         dev = iface->l3_dev.dev;
 342
 343         if (node_new) {
 344                 a_new = container_of(node_new, struct device_addr, node);
 345
 346                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 347                     !a_new->broadcast) {
 348
 349                         uint32_t mask = ~0;
 350                         uint32_t *a = (uint32_t *) &a_new->addr;
 351
 352                         mask >>= a_new->mask;
 353                         a_new->broadcast = *a | htonl(mask);
 354                 }
 355         }
 356
 357         if (node_old)
 358                 a_old = container_of(node_old, struct device_addr, node);
 359
 360         if (a_new && a_old) {
 361                 keep = true;
 362
 363                 if (a_old->flags != a_new->flags ||
 364                                 a_old->valid_until != a_new->valid_until ||
 365                                 a_old->preferred_until != a_new->preferred_until)
 366                         keep = false;
 367
 368                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 369                     a_new->broadcast != a_old->broadcast)
 370                         keep = false;
 371         }
 372
 373         if (node_old) {
 374                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 375                         interface_handle_subnet_route(iface, a_old, false);
 376                         system_del_address(dev, a_old);
 377                 }
 378                 free(a_old);
 379         }
 380
 381         if (node_new) {
 382                 a_new->enabled = true;
 383                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 384                         system_add_address(dev, a_new);
 385                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 386                                 interface_handle_subnet_route(iface, a_new, true);
 387                 }
 388         }
 389 }
 390
 391 static bool
 392 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 393 {
 394         if (ip->no_defaultroute && !route->mask)
 395                 return false;
 396
 397         return ip->enabled;
 398 }
 399
 400 static void
 401 interface_update_proto_route(struct vlist_tree *tree,
 402                              struct vlist_node *node_new,
 403                              struct vlist_node *node_old)
 404 {
 405         struct interface_ip_settings *ip;
 406         struct interface *iface;
 407         struct device *dev;
 408         struct device_route *route_old, *route_new;
 409         bool keep = false;
 410
 411         ip = container_of(tree, struct interface_ip_settings, route);
 412         iface = ip->iface;
 413         dev = iface->l3_dev.dev;
 414
 415         route_old = container_of(node_old, struct device_route, node);
 416         route_new = container_of(node_new, struct device_route, node);
 417
 418         if (node_old && node_new)
 419                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 420
 421         if (node_old) {
 422                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 423                         system_del_route(dev, route_old);
 424                 free(route_old);
 425         }
 426
 427         if (node_new) {
 428                 bool _enabled = enable_route(ip, route_new);
 429
 430                 if (!(route_new->flags & DEVROUTE_METRIC))
 431                         route_new->metric = iface->metric;
 432
 433                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 434                         system_add_route(dev, route_new);
 435
 436                 route_new->iface = iface;
 437                 route_new->enabled = _enabled;
 438         }
 439 }
 440
 441 static void
 442 interface_update_host_route(struct vlist_tree *tree,
 443                              struct vlist_node *node_new,
 444                              struct vlist_node *node_old)
 445 {
 446         struct interface *iface;
 447         struct device *dev;
 448         struct device_route *route_old, *route_new;
 449
 450         iface = container_of(tree, struct interface, host_routes);
 451         dev = iface->l3_dev.dev;
 452
 453         route_old = container_of(node_old, struct device_route, node);
 454         route_new = container_of(node_new, struct device_route, node);
 455
 456         if (node_old) {
 457                 system_del_route(dev, route_old);
 458                 free(route_old);
 459         }
 460
 461         if (node_new)
 462                 system_add_route(dev, route_new);
 463 }
 464
 465
 466 static void
 467 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 468                 const struct device_prefix *prefix, struct interface *iface, bool add)
 469 {
 470         const struct interface *uplink = prefix->iface;
 471         if (!iface->l3_dev.dev)
 472                 return;
 473
 474         struct device *l3_downlink = iface->l3_dev.dev;
 475
 476         struct device_addr addr;
 477         memset(&addr, 0, sizeof(addr));
 478         addr.addr.in6 = prefix->addr;
 479         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 480         addr.addr.in6.s6_addr[15] += 1;
 481         addr.mask = assignment->length;
 482         addr.flags = DEVADDR_INET6;
 483         addr.preferred_until = prefix->preferred_until;
 484         addr.valid_until = prefix->valid_until;
 485
 486         if (!add && assignment->enabled) {
 487                 time_t now = system_get_rtime();
 488                 addr.preferred_until = now;
 489                 if (!addr.valid_until || addr.valid_until - now > 7200)
 490                         addr.valid_until = now + 7200;
 491                 system_add_address(l3_downlink, &addr);
 492                 assignment->enabled = false;
 493         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 494                 system_add_address(l3_downlink, &addr);
 495                 if (uplink && uplink->l3_dev.dev) {
 496                         int mtu = system_update_ipv6_mtu(
 497                                         uplink->l3_dev.dev, 0);
 498                         if (mtu > 0)
 499                                 system_update_ipv6_mtu(l3_downlink, mtu);
 500                 }
 501                 assignment->enabled = true;
 502         }
 503 }
 504
 505 static bool interface_prefix_assign(struct list_head *list,
 506                 struct device_prefix_assignment *assign)
 507 {
 508         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 509         struct device_prefix_assignment *c;
 510         list_for_each_entry(c, list, head) {
 511                 if (assign->assigned != -1) {
 512                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 513                                 list_add_tail(&assign->head, &c->head);
 514                                 return true;
 515                         }
 516                 } else if (assign->assigned == -1) {
 517                         current = (current + asize) & (~asize);
 518                         if (current + asize < c->assigned) {
 519                                 assign->assigned = current;
 520                                 list_add_tail(&assign->head, &c->head);
 521                                 return true;
 522                         }
 523                 }
 524                 current = (c->assigned + (1 << (64 - c->length)));
 525         }
 526         return false;
 527 }
 528
 529 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 530 {
 531         struct device_prefix_assignment *c;
 532         struct interface *iface;
 533
 534         // Delete all assignments
 535         while (!list_empty(&prefix->assignments)) {
 536                 c = list_first_entry(&prefix->assignments,
 537                                 struct device_prefix_assignment, head);
 538                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 539                         interface_set_prefix_address(c, prefix, iface, false);
 540                 list_del(&c->head);
 541                 free(c);
 542         }
 543
 544         if (!setup)
 545                 return;
 546
 547         // End-of-assignment sentinel
 548         c = malloc(sizeof(*c) + 1);
 549         c->assigned = 1 << (64 - prefix->length);
 550         c->length = 64;
 551         c->name[0] = 0;
 552         list_add(&c->head, &prefix->assignments);
 553
 554         // Excluded prefix
 555         if (prefix->excl_length > 0) {
 556                 const char name[] = "!excluded";
 557                 c = malloc(sizeof(*c) + sizeof(name));
 558                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 559                                 ((1 << (64 - prefix->length)) - 1);
 560                 c->length = prefix->excl_length;
 561                 memcpy(c->name, name, sizeof(name));
 562                 list_add(&c->head, &prefix->assignments);
 563         }
 564
 565         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 566         vlist_for_each_element(&interfaces, iface, node) {
 567                 if (iface->config_ip.assignment_length < 48 ||
 568                                 iface->config_ip.assignment_length > 64)
 569                         continue;
 570
 571                 size_t namelen = strlen(iface->name) + 1;
 572                 c = malloc(sizeof(*c) + namelen);
 573                 c->length = iface->config_ip.assignment_length;
 574                 c->assigned = iface->config_ip.assignment_hint;
 575                 c->enabled = false;
 576                 memcpy(c->name, iface->name, namelen);
 577
 578                 // First process all custom assignments, put all others in later-list
 579                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 580                         if (c->assigned != -1) {
 581                                 c->assigned = -1;
 582                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 583                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 584                         }
 585                         list_add_tail(&c->head, &assign_later);
 586                 }
 587         }
 588
 589         // Then try to assign all other + failed custom assignments
 590         while (!list_empty(&assign_later)) {
 591                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 592                 list_del(&c->head);
 593                 if (!interface_prefix_assign(&prefix->assignments, c)) {
 594                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 595                                         "of size %hhu for %s\n", c->length, c->name);
 596                         free(c);
 597                 }
 598         }
 599
 600         list_for_each_entry(c, &prefix->assignments, head)
 601                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 602                         interface_set_prefix_address(c, prefix, iface, true);
 603 }
 604
 605
 606 void interface_refresh_assignments(bool hint)
 607 {
 608         static bool refresh = false;
 609         if (!hint && refresh) {
 610                 struct device_prefix *p;
 611                 list_for_each_entry(p, &prefixes, head)
 612                         interface_update_prefix_assignments(p, true);
 613         }
 614         refresh = hint;
 615 }
 616
 617
 618 static void
 619 interface_update_prefix(struct vlist_tree *tree,
 620                              struct vlist_node *node_new,
 621                              struct vlist_node *node_old)
 622 {
 623         struct device_prefix *prefix_old, *prefix_new;
 624         prefix_old = container_of(node_old, struct device_prefix, node);
 625         prefix_new = container_of(node_new, struct device_prefix, node);
 626
 627         struct device_route route;
 628         memset(&route, 0, sizeof(route));
 629         route.flags = DEVADDR_INET6;
 630         route.metric = INT32_MAX;
 631         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 632         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 633
 634         struct device_prefix_assignment *c;
 635         struct interface *iface;
 636
 637         if (node_old && node_new) {
 638                 // Move assignments and refresh addresses to update valid times
 639                 list_splice_init(&prefix_old->assignments, &prefix_new->assignments);
 640
 641                 list_for_each_entry(c, &prefix_new->assignments, head)
 642                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 643                                 interface_set_prefix_address(c, prefix_new, iface, true);
 644         } else if (node_new) {
 645                 // Set null-route to avoid routing loops
 646                 system_add_route(NULL, &route);
 647
 648                 INIT_LIST_HEAD(&prefix_new->assignments);
 649                 interface_update_prefix_assignments(prefix_new, true);
 650         } else if (node_old) {
 651                 interface_update_prefix_assignments(prefix_old, false);
 652
 653                 // Remove null-route
 654                 system_del_route(NULL, &route);
 655         }
 656
 657         if (node_old) {
 658                 list_del(&prefix_old->head);
 659                 free(prefix_old);
 660         }
 661
 662         if (node_new)
 663                 list_add(&prefix_new->head, &prefixes);
 664
 665 }
 666
 667 struct device_prefix*
 668 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 669                 uint8_t length, time_t valid_until, time_t preferred_until,
 670                 struct in6_addr *excl_addr, uint8_t excl_length)
 671 {
 672         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 673         prefix->length = length;
 674         prefix->addr = *addr;
 675         prefix->preferred_until = preferred_until;
 676         prefix->valid_until = valid_until;
 677         prefix->iface = iface;
 678
 679         if (excl_addr) {
 680                 prefix->excl_addr = *excl_addr;
 681                 prefix->excl_length = excl_length;
 682         }
 683
 684         if (iface)
 685                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 686         else
 687                 interface_update_prefix(NULL, &prefix->node, NULL);
 688
 689         return prefix;
 690 }
 691
 692 void
 693 interface_ip_set_ula_prefix(const char *prefix)
 694 {
 695         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 696         if (prefix)
 697                 strncpy(buf, prefix, sizeof(buf) - 1);
 698         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 699
 700         struct in6_addr addr;
 701         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 702                 if (ula_prefix) {
 703                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 704                         ula_prefix = NULL;
 705                 }
 706                 return;
 707         }
 708
 709         int length;
 710         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 711         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 712                 return;
 713
 714         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 715                         ula_prefix->length != length) {
 716                 if (ula_prefix)
 717                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 718
 719                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 720                                 0, 0, NULL, 0);
 721         }
 722 }
 723
 724 void
 725 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 726 {
 727         struct dns_server *s;
 728
 729         s = calloc(1, sizeof(*s));
 730         if (!s)
 731                 return;
 732
 733         s->af = AF_INET;
 734         if (inet_pton(s->af, str, &s->addr.in))
 735                 goto add;
 736
 737         s->af = AF_INET6;
 738         if (inet_pton(s->af, str, &s->addr.in))
 739                 goto add;
 740
 741         free(s);
 742         return;
 743
 744 add:
 745         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 746           s->af == AF_INET6 ? '6' : '4', str);
 747         vlist_simple_add(&ip->dns_servers, &s->node);
 748 }
 749
 750 void
 751 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 752 {
 753         struct blob_attr *cur;
 754         int rem;
 755
 756         blobmsg_for_each_attr(cur, list, rem) {
 757                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 758                         continue;
 759
 760                 if (!blobmsg_check_attr(cur, NULL))
 761                         continue;
 762
 763                 interface_add_dns_server(ip, blobmsg_data(cur));
 764         }
 765 }
 766
 767 static void
 768 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 769 {
 770         struct dns_search_domain *s;
 771         int len = strlen(str);
 772
 773         s = calloc(1, sizeof(*s) + len + 1);
 774         if (!s)
 775                 return;
 776
 777         D(INTERFACE, "Add DNS search domain: %s\n", str);
 778         memcpy(s->name, str, len);
 779         vlist_simple_add(&ip->dns_search, &s->node);
 780 }
 781
 782 void
 783 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 784 {
 785         struct blob_attr *cur;
 786         int rem;
 787
 788         blobmsg_for_each_attr(cur, list, rem) {
 789                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 790                         continue;
 791
 792                 if (!blobmsg_check_attr(cur, NULL))
 793                         continue;
 794
 795                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 796         }
 797 }
 798
 799 static void
 800 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 801 {
 802         struct dns_server *s;
 803         struct dns_search_domain *d;
 804         const char *str;
 805         char buf[INET6_ADDRSTRLEN];
 806
 807         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 808                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 809                 if (!str)
 810                         continue;
 811
 812                 fprintf(f, "nameserver %s\n", str);
 813         }
 814
 815         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 816                 fprintf(f, "search %s\n", d->name);
 817         }
 818 }
 819
 820 void
 821 interface_write_resolv_conf(void)
 822 {
 823         struct interface *iface;
 824         char *path = alloca(strlen(resolv_conf) + 5);
 825         FILE *f;
 826         uint32_t crcold, crcnew;
 827
 828         sprintf(path, "%s.tmp", resolv_conf);
 829         unlink(path);
 830         f = fopen(path, "w+");
 831         if (!f) {
 832                 D(INTERFACE, "Failed to open %s for writing\n", path);
 833                 return;
 834         }
 835
 836         vlist_for_each_element(&interfaces, iface, node) {
 837                 if (iface->state != IFS_UP)
 838                         continue;
 839
 840                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 841                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 842                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 843                     vlist_simple_empty(&iface->config_ip.dns_servers))
 844                         continue;
 845
 846                 fprintf(f, "# Interface %s\n", iface->name);
 847                 write_resolv_conf_entries(f, &iface->config_ip);
 848                 if (!iface->proto_ip.no_dns)
 849                         write_resolv_conf_entries(f, &iface->proto_ip);
 850         }
 851         fflush(f);
 852         rewind(f);
 853         crcnew = crc32_file(f);
 854         fclose(f);
 855
 856         crcold = crcnew + 1;
 857         f = fopen(resolv_conf, "r");
 858         if (f) {
 859                 crcold = crc32_file(f);
 860                 fclose(f);
 861         }
 862
 863         if (crcold == crcnew) {
 864                 unlink(path);
 865         } else if (rename(path, resolv_conf) < 0) {
 866                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 867                 unlink(path);
 868         }
 869 }
 870
 871 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 872 {
 873         struct device_addr *addr;
 874         struct device_route *route;
 875         struct device *dev;
 876
 877         ip->enabled = enabled;
 878         dev = ip->iface->l3_dev.dev;
 879         if (!dev)
 880                 return;
 881
 882         vlist_for_each_element(&ip->addr, addr, node) {
 883                 if (addr->enabled == enabled)
 884                         continue;
 885
 886                 if (enabled)
 887                         system_add_address(dev, addr);
 888                 else
 889                         system_del_address(dev, addr);
 890                 addr->enabled = enabled;
 891         }
 892
 893         vlist_for_each_element(&ip->route, route, node) {
 894                 bool _enabled = enabled;
 895
 896                 if (!enable_route(ip, route))
 897                         _enabled = false;
 898
 899                 if (route->enabled == _enabled)
 900                         continue;
 901
 902                 if (_enabled) {
 903                         if (!(route->flags & DEVROUTE_METRIC))
 904                                 route->metric = ip->iface->metric;
 905
 906                         system_add_route(dev, route);
 907                 } else
 908                         system_del_route(dev, route);
 909                 route->enabled = _enabled;
 910         }
 911
 912         struct device_prefix *c;
 913         struct device_prefix_assignment *a;
 914         list_for_each_entry(c, &prefixes, head)
 915                 list_for_each_entry(a, &c->assignments, head)
 916                         if (!strcmp(a->name, ip->iface->name))
 917                                 interface_set_prefix_address(a, c, ip->iface, enabled);
 918 }
 919
 920 void
 921 interface_ip_update_start(struct interface_ip_settings *ip)
 922 {
 923         if (ip != &ip->iface->config_ip) {
 924                 vlist_simple_update(&ip->dns_servers);
 925                 vlist_simple_update(&ip->dns_search);
 926         }
 927         vlist_update(&ip->route);
 928         vlist_update(&ip->addr);
 929         vlist_update(&ip->prefix);
 930 }
 931
 932 void
 933 interface_ip_update_complete(struct interface_ip_settings *ip)
 934 {
 935         vlist_simple_flush(&ip->dns_servers);
 936         vlist_simple_flush(&ip->dns_search);
 937         vlist_flush(&ip->route);
 938         vlist_flush(&ip->addr);
 939         vlist_flush(&ip->prefix);
 940         interface_write_resolv_conf();
 941 }
 942
 943 void
 944 interface_ip_flush(struct interface_ip_settings *ip)
 945 {
 946         if (ip == &ip->iface->proto_ip)
 947                 vlist_flush_all(&ip->iface->host_routes);
 948         vlist_simple_flush_all(&ip->dns_servers);
 949         vlist_simple_flush_all(&ip->dns_search);
 950         vlist_flush_all(&ip->route);
 951         vlist_flush_all(&ip->addr);
 952         vlist_flush_all(&ip->prefix);
 953 }
 954
 955 static void
 956 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 957 {
 958         ip->iface = iface;
 959         ip->enabled = true;
 960         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 961         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 962         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 963         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 964         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 965 }
 966
 967 void
 968 interface_ip_init(struct interface *iface)
 969 {
 970         __interface_ip_init(&iface->proto_ip, iface);
 971         __interface_ip_init(&iface->config_ip, iface);
 972         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 973
 974 }
 975
 976 static void
 977 interface_ip_valid_until_handler(struct uloop_timeout *t)
 978 {
 979         time_t now = system_get_rtime();
 980         struct interface *iface;
 981         vlist_for_each_element(&interfaces, iface, node) {
 982                 if (iface->state != IFS_UP)
 983                         continue;
 984
 985                 struct device_addr *addr, *addrp;
 986                 struct device_route *route, *routep;
 987                 struct device_prefix *pref, *prefp;
 988
 989                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
 990                         if (addr->valid_until && addr->valid_until < now)
 991                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
 992
 993                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
 994                         if (route->valid_until && route->valid_until < now)
 995                                 vlist_delete(&iface->proto_ip.route, &route->node);
 996
 997                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
 998                         if (pref->valid_until && pref->valid_until < now)
 999                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1000
1001         }
1002
1003         uloop_timeout_set(t, 1000);
1004 }
1005
1006 static void __init
1007 interface_ip_init_worker(void)
1008 {
1009         valid_until_timeout.cb = interface_ip_valid_until_handler;
1010         uloop_timeout_set(&valid_until_timeout, 1000);
1011 }