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 #include <unistd.h>
  19
  20 #include <arpa/inet.h>
  21
  22 #include "netifd.h"
  23 #include "device.h"
  24 #include "interface.h"
  25 #include "interface-ip.h"
  26 #include "proto.h"
  27 #include "ubus.h"
  28 #include "system.h"
  29
  30 enum {
  31         ROUTE_INTERFACE,
  32         ROUTE_TARGET,
  33         ROUTE_MASK,
  34         ROUTE_GATEWAY,
  35         ROUTE_METRIC,
  36         ROUTE_MTU,
  37         ROUTE_VALID,
  38         ROUTE_TABLE,
  39         __ROUTE_MAX
  40 };
  41
  42 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  43         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  44         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  46         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  47         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  48         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  49         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  50         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  51 };
  52
  53 const struct config_param_list route_attr_list = {
  54         .n_params = __ROUTE_MAX,
  55         .params = route_attr,
  56 };
  57
  58
  59 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  60 static struct device_prefix *ula_prefix = NULL;
  61 static struct uloop_timeout valid_until_timeout;
  62
  63
  64 static void
  65 clear_if_addr(union if_addr *a, int mask)
  66 {
  67         int m_bytes = (mask + 7) / 8;
  68         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  69         uint8_t *p = (uint8_t *) a;
  70
  71         if (m_bytes < sizeof(a))
  72                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  73
  74         p[m_bytes - 1] &= ~m_clear;
  75 }
  76
  77 static bool
  78 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  79 {
  80         union if_addr *p1, *p2;
  81
  82         p1 = alloca(sizeof(*a1));
  83         p2 = alloca(sizeof(*a2));
  84
  85         memcpy(p1, a1, sizeof(*a1));
  86         clear_if_addr(p1, mask);
  87         memcpy(p2, a2, sizeof(*a2));
  88         clear_if_addr(p2, mask);
  89
  90         return !memcmp(p1, p2, sizeof(*p1));
  91 }
  92
  93 static bool
  94 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
  95 {
  96         struct device_addr *addr;
  97
  98         vlist_for_each_element(&ip->addr, addr, node) {
  99                 if (!addr->enabled)
 100                         continue;
 101
 102                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 103                         continue;
 104
 105                 if (!match_if_addr(&addr->addr, a, addr->mask))
 106                         continue;
 107
 108                 return true;
 109         }
 110
 111         return false;
 112 }
 113
 114 static void
 115 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 116                        bool v6, struct device_route **res)
 117 {
 118         struct device_route *route;
 119
 120         vlist_for_each_element(&ip->route, route, node) {
 121                 if (!route->enabled)
 122                         continue;
 123
 124                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 125                         continue;
 126
 127                 if (!match_if_addr(&route->addr, a, route->mask))
 128                         continue;
 129
 130                 if (route->flags & DEVROUTE_TABLE)
 131                         continue;
 132
 133                 if (!*res || route->mask < (*res)->mask)
 134                         *res = route;
 135         }
 136 }
 137
 138 static bool
 139 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 140 {
 141         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 142                __find_ip_addr_target(&iface->config_ip, a, v6);
 143 }
 144
 145 static void
 146 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 147                                bool v6, struct device_route **route)
 148 {
 149         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 150         __find_ip_route_target(&iface->config_ip, a, v6, route);
 151 }
 152
 153 struct interface *
 154 interface_ip_add_target_route(union if_addr *addr, bool v6)
 155 {
 156         struct interface *iface;
 157         struct device_route *route, *r_next = NULL;
 158         bool defaultroute_target = false;
 159         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 160
 161         route = calloc(1, sizeof(*route));
 162         if (!route)
 163                 return NULL;
 164
 165         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 166         route->mask = v6 ? 128 : 32;
 167         if (memcmp(&route->addr, addr, addrsize) == 0)
 168                 defaultroute_target = true;
 169         else
 170                 memcpy(&route->addr, addr, addrsize);
 171
 172         vlist_for_each_element(&interfaces, iface, node) {
 173                 /* look for locally addressable target first */
 174                 if (interface_ip_find_addr_target(iface, addr, v6))
 175                         goto done;
 176
 177                 /* do not stop at the first route, let the lookup compare
 178                  * masks to find the best match */
 179                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 180         }
 181
 182         if (!r_next) {
 183                 free(route);
 184                 return NULL;
 185         }
 186
 187         iface = r_next->iface;
 188         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 189         route->mtu = r_next->mtu;
 190         route->metric = r_next->metric;
 191
 192 done:
 193         route->iface = iface;
 194         if (defaultroute_target)
 195                 free(route);
 196         else
 197                 vlist_add(&iface->host_routes, &route->node, &route->flags);
 198         return iface;
 199 }
 200
 201 void
 202 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 203 {
 204         struct interface_ip_settings *ip;
 205         struct blob_attr *tb[__ROUTE_MAX], *cur;
 206         struct device_route *route;
 207         int af = v6 ? AF_INET6 : AF_INET;
 208
 209         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 210
 211         if (!iface) {
 212                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 213                         return;
 214
 215                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 216                 if (!iface)
 217                         return;
 218
 219                 ip = &iface->config_ip;
 220         } else {
 221                 ip = &iface->proto_ip;
 222         }
 223
 224         route = calloc(1, sizeof(*route));
 225         if (!route)
 226                 return;
 227
 228         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 229         route->mask = v6 ? 128 : 32;
 230         if ((cur = tb[ROUTE_MASK]) != NULL) {
 231                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 232                 if (route->mask > (v6 ? 128 : 32))
 233                         goto error;
 234         }
 235
 236         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 237                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 238                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 239                         goto error;
 240                 }
 241         }
 242
 243         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 244                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 245                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 246                         goto error;
 247                 }
 248         }
 249
 250         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 251                 route->metric = blobmsg_get_u32(cur);
 252                 route->flags |= DEVROUTE_METRIC;
 253         }
 254
 255         if ((cur = tb[ROUTE_MTU]) != NULL) {
 256                 route->mtu = blobmsg_get_u32(cur);
 257                 route->flags |= DEVROUTE_MTU;
 258         }
 259
 260         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 261                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 262                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 263                         goto error;
 264                 }
 265
 266                 if (route->table)
 267                         route->flags |= DEVROUTE_TABLE;
 268         }
 269
 270         if ((cur = tb[ROUTE_VALID]) != NULL)
 271                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 272
 273         vlist_add(&ip->route, &route->node, &route->flags);
 274         return;
 275
 276 error:
 277         free(route);
 278 }
 279
 280 static int
 281 addr_cmp(const void *k1, const void *k2, void *ptr)
 282 {
 283         return memcmp(k1, k2, sizeof(struct device_addr) -
 284                       offsetof(struct device_addr, flags));
 285 }
 286
 287 static int
 288 route_cmp(const void *k1, const void *k2, void *ptr)
 289 {
 290         return memcmp(k1, k2, sizeof(struct device_route) -
 291                       offsetof(struct device_route, flags));
 292 }
 293
 294 static int
 295 prefix_cmp(const void *k1, const void *k2, void *ptr)
 296 {
 297         return memcmp(k1, k2, sizeof(struct device_prefix) -
 298                         offsetof(struct device_prefix, addr));
 299 }
 300
 301 static void
 302 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 303 {
 304         struct device *dev = iface->l3_dev.dev;
 305         struct device_route route;
 306
 307         memset(&route, 0, sizeof(route));
 308         route.iface = iface;
 309         route.flags = addr->flags;
 310         route.mask = addr->mask;
 311         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 312         clear_if_addr(&route.addr, route.mask);
 313
 314         if (add) {
 315                 route.flags |= DEVADDR_KERNEL;
 316                 system_del_route(dev, &route);
 317
 318                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 319                         route.flags &= ~DEVADDR_KERNEL;
 320                         route.metric = iface->metric;
 321                         system_add_route(dev, &route);
 322                 }
 323         } else {
 324                 if (!(addr->flags & DEVADDR_OFFLINK))
 325                         system_del_route(dev, &route);
 326         }
 327 }
 328
 329 static void
 330 interface_update_proto_addr(struct vlist_tree *tree,
 331                             struct vlist_node *node_new,
 332                             struct vlist_node *node_old)
 333 {
 334         struct interface_ip_settings *ip;
 335         struct interface *iface;
 336         struct device *dev;
 337         struct device_addr *a_new = NULL, *a_old = NULL;
 338         bool keep = false;
 339
 340         ip = container_of(tree, struct interface_ip_settings, addr);
 341         iface = ip->iface;
 342         dev = iface->l3_dev.dev;
 343
 344         if (node_new) {
 345                 a_new = container_of(node_new, struct device_addr, node);
 346
 347                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 348                     !a_new->broadcast) {
 349
 350                         uint32_t mask = ~0;
 351                         uint32_t *a = (uint32_t *) &a_new->addr;
 352
 353                         mask >>= a_new->mask;
 354                         a_new->broadcast = *a | htonl(mask);
 355                 }
 356         }
 357
 358         if (node_old)
 359                 a_old = container_of(node_old, struct device_addr, node);
 360
 361         if (a_new && a_old) {
 362                 keep = true;
 363
 364                 if (a_old->flags != a_new->flags ||
 365                                 a_old->valid_until != a_new->valid_until ||
 366                                 a_old->preferred_until != a_new->preferred_until)
 367                         keep = false;
 368
 369                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 370                     a_new->broadcast != a_old->broadcast)
 371                         keep = false;
 372         }
 373
 374         if (node_old) {
 375                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 376                         interface_handle_subnet_route(iface, a_old, false);
 377                         system_del_address(dev, a_old);
 378                 }
 379                 free(a_old);
 380         }
 381
 382         if (node_new) {
 383                 a_new->enabled = true;
 384                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 385                         system_add_address(dev, a_new);
 386                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 387                                 interface_handle_subnet_route(iface, a_new, true);
 388                 }
 389         }
 390 }
 391
 392 static bool
 393 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 394 {
 395         if (ip->no_defaultroute && !route->mask)
 396                 return false;
 397
 398         return ip->enabled;
 399 }
 400
 401 static void
 402 interface_update_proto_route(struct vlist_tree *tree,
 403                              struct vlist_node *node_new,
 404                              struct vlist_node *node_old)
 405 {
 406         struct interface_ip_settings *ip;
 407         struct interface *iface;
 408         struct device *dev;
 409         struct device_route *route_old, *route_new;
 410         bool keep = false;
 411
 412         ip = container_of(tree, struct interface_ip_settings, route);
 413         iface = ip->iface;
 414         dev = iface->l3_dev.dev;
 415
 416         route_old = container_of(node_old, struct device_route, node);
 417         route_new = container_of(node_new, struct device_route, node);
 418
 419         if (node_old && node_new)
 420                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 421
 422         if (node_old) {
 423                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 424                         system_del_route(dev, route_old);
 425                 free(route_old);
 426         }
 427
 428         if (node_new) {
 429                 bool _enabled = enable_route(ip, route_new);
 430
 431                 if (!(route_new->flags & DEVROUTE_METRIC))
 432                         route_new->metric = iface->metric;
 433
 434                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 435                         system_add_route(dev, route_new);
 436
 437                 route_new->iface = iface;
 438                 route_new->enabled = _enabled;
 439         }
 440 }
 441
 442 static void
 443 interface_update_host_route(struct vlist_tree *tree,
 444                              struct vlist_node *node_new,
 445                              struct vlist_node *node_old)
 446 {
 447         struct interface *iface;
 448         struct device *dev;
 449         struct device_route *route_old, *route_new;
 450
 451         iface = container_of(tree, struct interface, host_routes);
 452         dev = iface->l3_dev.dev;
 453
 454         route_old = container_of(node_old, struct device_route, node);
 455         route_new = container_of(node_new, struct device_route, node);
 456
 457         if (node_old) {
 458                 system_del_route(dev, route_old);
 459                 free(route_old);
 460         }
 461
 462         if (node_new)
 463                 system_add_route(dev, route_new);
 464 }
 465
 466
 467 static void
 468 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 469                 const struct device_prefix *prefix, struct interface *iface, bool add)
 470 {
 471         const struct interface *uplink = prefix->iface;
 472         if (!iface->l3_dev.dev)
 473                 return;
 474
 475         struct device *l3_downlink = iface->l3_dev.dev;
 476
 477         struct device_addr addr;
 478         memset(&addr, 0, sizeof(addr));
 479         addr.addr.in6 = prefix->addr;
 480         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 481         addr.addr.in6.s6_addr[15] += 1;
 482         addr.mask = assignment->length;
 483         addr.flags = DEVADDR_INET6;
 484         addr.preferred_until = prefix->preferred_until;
 485         addr.valid_until = prefix->valid_until;
 486
 487         if (!add && assignment->enabled) {
 488                 time_t now = system_get_rtime();
 489                 addr.preferred_until = now;
 490                 if (!addr.valid_until || addr.valid_until - now > 7200)
 491                         addr.valid_until = now + 7200;
 492                 system_add_address(l3_downlink, &addr);
 493                 assignment->enabled = false;
 494         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 495                 system_add_address(l3_downlink, &addr);
 496                 if (uplink && uplink->l3_dev.dev) {
 497                         int mtu = system_update_ipv6_mtu(
 498                                         uplink->l3_dev.dev, 0);
 499                         if (mtu > 0)
 500                                 system_update_ipv6_mtu(l3_downlink, mtu);
 501                 }
 502                 assignment->enabled = true;
 503         }
 504 }
 505
 506 static bool interface_prefix_assign(struct list_head *list,
 507                 struct device_prefix_assignment *assign)
 508 {
 509         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 510         struct device_prefix_assignment *c;
 511         list_for_each_entry(c, list, head) {
 512                 if (assign->assigned != -1) {
 513                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 514                                 list_add_tail(&assign->head, &c->head);
 515                                 return true;
 516                         }
 517                 } else if (assign->assigned == -1) {
 518                         current = (current + asize) & (~asize);
 519                         if (current + asize < c->assigned) {
 520                                 assign->assigned = current;
 521                                 list_add_tail(&assign->head, &c->head);
 522                                 return true;
 523                         }
 524                 }
 525                 current = (c->assigned + (1 << (64 - c->length)));
 526         }
 527         return false;
 528 }
 529
 530 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 531 {
 532         struct device_prefix_assignment *c;
 533         struct interface *iface;
 534
 535         // Delete all assignments
 536         while (!list_empty(&prefix->assignments)) {
 537                 c = list_first_entry(&prefix->assignments,
 538                                 struct device_prefix_assignment, head);
 539                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 540                         interface_set_prefix_address(c, prefix, iface, false);
 541                 list_del(&c->head);
 542                 free(c);
 543         }
 544
 545         if (!setup)
 546                 return;
 547
 548         // End-of-assignment sentinel
 549         c = malloc(sizeof(*c) + 1);
 550         c->assigned = 1 << (64 - prefix->length);
 551         c->length = 64;
 552         c->name[0] = 0;
 553         list_add(&c->head, &prefix->assignments);
 554
 555         // Excluded prefix
 556         if (prefix->excl_length > 0) {
 557                 const char name[] = "!excluded";
 558                 c = malloc(sizeof(*c) + sizeof(name));
 559                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 560                                 ((1 << (64 - prefix->length)) - 1);
 561                 c->length = prefix->excl_length;
 562                 memcpy(c->name, name, sizeof(name));
 563                 list_add(&c->head, &prefix->assignments);
 564         }
 565
 566         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 567         vlist_for_each_element(&interfaces, iface, node) {
 568                 if (iface->config_ip.assignment_length < 48 ||
 569                                 iface->config_ip.assignment_length > 64)
 570                         continue;
 571
 572                 size_t namelen = strlen(iface->name) + 1;
 573                 c = malloc(sizeof(*c) + namelen);
 574                 c->length = iface->config_ip.assignment_length;
 575                 c->assigned = iface->config_ip.assignment_hint;
 576                 c->enabled = false;
 577                 memcpy(c->name, iface->name, namelen);
 578
 579                 // First process all custom assignments, put all others in later-list
 580                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 581                         if (c->assigned != -1) {
 582                                 c->assigned = -1;
 583                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 584                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 585                         }
 586                         list_add_tail(&c->head, &assign_later);
 587                 }
 588         }
 589
 590         // Then try to assign all other + failed custom assignments
 591         while (!list_empty(&assign_later)) {
 592                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 593                 list_del(&c->head);
 594                 if (!interface_prefix_assign(&prefix->assignments, c)) {
 595                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 596                                         "of size %hhu for %s\n", c->length, c->name);
 597                         free(c);
 598                 }
 599         }
 600
 601         list_for_each_entry(c, &prefix->assignments, head)
 602                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 603                         interface_set_prefix_address(c, prefix, iface, true);
 604 }
 605
 606
 607 void interface_refresh_assignments(bool hint)
 608 {
 609         static bool refresh = false;
 610         if (!hint && refresh) {
 611                 struct device_prefix *p;
 612                 list_for_each_entry(p, &prefixes, head)
 613                         interface_update_prefix_assignments(p, true);
 614         }
 615         refresh = hint;
 616 }
 617
 618
 619 static void
 620 interface_update_prefix(struct vlist_tree *tree,
 621                              struct vlist_node *node_new,
 622                              struct vlist_node *node_old)
 623 {
 624         struct device_prefix *prefix_old, *prefix_new;
 625         prefix_old = container_of(node_old, struct device_prefix, node);
 626         prefix_new = container_of(node_new, struct device_prefix, node);
 627
 628         struct device_route route;
 629         memset(&route, 0, sizeof(route));
 630         route.flags = DEVADDR_INET6;
 631         route.metric = INT32_MAX;
 632         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 633         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 634
 635         struct device_prefix_assignment *c;
 636         struct interface *iface;
 637
 638         if (node_old && node_new) {
 639                 // Move assignments and refresh addresses to update valid times
 640                 list_splice_init(&prefix_old->assignments, &prefix_new->assignments);
 641
 642                 list_for_each_entry(c, &prefix_new->assignments, head)
 643                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 644                                 interface_set_prefix_address(c, prefix_new, iface, true);
 645         } else if (node_new) {
 646                 // Set null-route to avoid routing loops
 647                 system_add_route(NULL, &route);
 648
 649                 INIT_LIST_HEAD(&prefix_new->assignments);
 650                 interface_update_prefix_assignments(prefix_new, true);
 651         } else if (node_old) {
 652                 interface_update_prefix_assignments(prefix_old, false);
 653
 654                 // Remove null-route
 655                 system_del_route(NULL, &route);
 656         }
 657
 658         if (node_old) {
 659                 list_del(&prefix_old->head);
 660                 free(prefix_old);
 661         }
 662
 663         if (node_new)
 664                 list_add(&prefix_new->head, &prefixes);
 665
 666 }
 667
 668 struct device_prefix*
 669 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 670                 uint8_t length, time_t valid_until, time_t preferred_until,
 671                 struct in6_addr *excl_addr, uint8_t excl_length)
 672 {
 673         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 674         prefix->length = length;
 675         prefix->addr = *addr;
 676         prefix->preferred_until = preferred_until;
 677         prefix->valid_until = valid_until;
 678         prefix->iface = iface;
 679
 680         if (excl_addr) {
 681                 prefix->excl_addr = *excl_addr;
 682                 prefix->excl_length = excl_length;
 683         }
 684
 685         if (iface)
 686                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 687         else
 688                 interface_update_prefix(NULL, &prefix->node, NULL);
 689
 690         return prefix;
 691 }
 692
 693 void
 694 interface_ip_set_ula_prefix(const char *prefix)
 695 {
 696         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 697         if (prefix)
 698                 strncpy(buf, prefix, sizeof(buf) - 1);
 699         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 700
 701         struct in6_addr addr;
 702         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 703                 if (ula_prefix) {
 704                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 705                         ula_prefix = NULL;
 706                 }
 707                 return;
 708         }
 709
 710         int length;
 711         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 712         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 713                 return;
 714
 715         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 716                         ula_prefix->length != length) {
 717                 if (ula_prefix)
 718                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 719
 720                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 721                                 0, 0, NULL, 0);
 722         }
 723 }
 724
 725 void
 726 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 727 {
 728         struct dns_server *s;
 729
 730         s = calloc(1, sizeof(*s));
 731         if (!s)
 732                 return;
 733
 734         s->af = AF_INET;
 735         if (inet_pton(s->af, str, &s->addr.in))
 736                 goto add;
 737
 738         s->af = AF_INET6;
 739         if (inet_pton(s->af, str, &s->addr.in))
 740                 goto add;
 741
 742         free(s);
 743         return;
 744
 745 add:
 746         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 747           s->af == AF_INET6 ? '6' : '4', str);
 748         vlist_simple_add(&ip->dns_servers, &s->node);
 749 }
 750
 751 void
 752 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 753 {
 754         struct blob_attr *cur;
 755         int rem;
 756
 757         blobmsg_for_each_attr(cur, list, rem) {
 758                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 759                         continue;
 760
 761                 if (!blobmsg_check_attr(cur, NULL))
 762                         continue;
 763
 764                 interface_add_dns_server(ip, blobmsg_data(cur));
 765         }
 766 }
 767
 768 static void
 769 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 770 {
 771         struct dns_search_domain *s;
 772         int len = strlen(str);
 773
 774         s = calloc(1, sizeof(*s) + len + 1);
 775         if (!s)
 776                 return;
 777
 778         D(INTERFACE, "Add DNS search domain: %s\n", str);
 779         memcpy(s->name, str, len);
 780         vlist_simple_add(&ip->dns_search, &s->node);
 781 }
 782
 783 void
 784 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 785 {
 786         struct blob_attr *cur;
 787         int rem;
 788
 789         blobmsg_for_each_attr(cur, list, rem) {
 790                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 791                         continue;
 792
 793                 if (!blobmsg_check_attr(cur, NULL))
 794                         continue;
 795
 796                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 797         }
 798 }
 799
 800 static void
 801 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 802 {
 803         struct dns_server *s;
 804         struct dns_search_domain *d;
 805         const char *str;
 806         char buf[INET6_ADDRSTRLEN];
 807
 808         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 809                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 810                 if (!str)
 811                         continue;
 812
 813                 fprintf(f, "nameserver %s\n", str);
 814         }
 815
 816         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 817                 fprintf(f, "search %s\n", d->name);
 818         }
 819 }
 820
 821 void
 822 interface_write_resolv_conf(void)
 823 {
 824         struct interface *iface;
 825         char *path = alloca(strlen(resolv_conf) + 5);
 826         FILE *f;
 827         uint32_t crcold, crcnew;
 828
 829         sprintf(path, "%s.tmp", resolv_conf);
 830         unlink(path);
 831         f = fopen(path, "w+");
 832         if (!f) {
 833                 D(INTERFACE, "Failed to open %s for writing\n", path);
 834                 return;
 835         }
 836
 837         vlist_for_each_element(&interfaces, iface, node) {
 838                 if (iface->state != IFS_UP)
 839                         continue;
 840
 841                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 842                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 843                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 844                     vlist_simple_empty(&iface->config_ip.dns_servers))
 845                         continue;
 846
 847                 fprintf(f, "# Interface %s\n", iface->name);
 848                 write_resolv_conf_entries(f, &iface->config_ip);
 849                 if (!iface->proto_ip.no_dns)
 850                         write_resolv_conf_entries(f, &iface->proto_ip);
 851         }
 852         fflush(f);
 853         rewind(f);
 854         crcnew = crc32_file(f);
 855         fclose(f);
 856
 857         crcold = crcnew + 1;
 858         f = fopen(resolv_conf, "r");
 859         if (f) {
 860                 crcold = crc32_file(f);
 861                 fclose(f);
 862         }
 863
 864         if (crcold == crcnew) {
 865                 unlink(path);
 866         } else if (rename(path, resolv_conf) < 0) {
 867                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 868                 unlink(path);
 869         }
 870 }
 871
 872 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 873 {
 874         struct device_addr *addr;
 875         struct device_route *route;
 876         struct device *dev;
 877
 878         ip->enabled = enabled;
 879         dev = ip->iface->l3_dev.dev;
 880         if (!dev)
 881                 return;
 882
 883         vlist_for_each_element(&ip->addr, addr, node) {
 884                 if (addr->enabled == enabled)
 885                         continue;
 886
 887                 if (enabled)
 888                         system_add_address(dev, addr);
 889                 else
 890                         system_del_address(dev, addr);
 891                 addr->enabled = enabled;
 892         }
 893
 894         vlist_for_each_element(&ip->route, route, node) {
 895                 bool _enabled = enabled;
 896
 897                 if (!enable_route(ip, route))
 898                         _enabled = false;
 899
 900                 if (route->enabled == _enabled)
 901                         continue;
 902
 903                 if (_enabled) {
 904                         if (!(route->flags & DEVROUTE_METRIC))
 905                                 route->metric = ip->iface->metric;
 906
 907                         system_add_route(dev, route);
 908                 } else
 909                         system_del_route(dev, route);
 910                 route->enabled = _enabled;
 911         }
 912
 913         struct device_prefix *c;
 914         struct device_prefix_assignment *a;
 915         list_for_each_entry(c, &prefixes, head)
 916                 list_for_each_entry(a, &c->assignments, head)
 917                         if (!strcmp(a->name, ip->iface->name))
 918                                 interface_set_prefix_address(a, c, ip->iface, enabled);
 919 }
 920
 921 void
 922 interface_ip_update_start(struct interface_ip_settings *ip)
 923 {
 924         if (ip != &ip->iface->config_ip) {
 925                 vlist_simple_update(&ip->dns_servers);
 926                 vlist_simple_update(&ip->dns_search);
 927         }
 928         vlist_update(&ip->route);
 929         vlist_update(&ip->addr);
 930         vlist_update(&ip->prefix);
 931 }
 932
 933 void
 934 interface_ip_update_complete(struct interface_ip_settings *ip)
 935 {
 936         vlist_simple_flush(&ip->dns_servers);
 937         vlist_simple_flush(&ip->dns_search);
 938         vlist_flush(&ip->route);
 939         vlist_flush(&ip->addr);
 940         vlist_flush(&ip->prefix);
 941         interface_write_resolv_conf();
 942 }
 943
 944 void
 945 interface_ip_flush(struct interface_ip_settings *ip)
 946 {
 947         if (ip == &ip->iface->proto_ip)
 948                 vlist_flush_all(&ip->iface->host_routes);
 949         vlist_simple_flush_all(&ip->dns_servers);
 950         vlist_simple_flush_all(&ip->dns_search);
 951         vlist_flush_all(&ip->route);
 952         vlist_flush_all(&ip->addr);
 953         vlist_flush_all(&ip->prefix);
 954 }
 955
 956 static void
 957 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 958 {
 959         ip->iface = iface;
 960         ip->enabled = true;
 961         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 962         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 963         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 964         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 965         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
 966 }
 967
 968 void
 969 interface_ip_init(struct interface *iface)
 970 {
 971         __interface_ip_init(&iface->proto_ip, iface);
 972         __interface_ip_init(&iface->config_ip, iface);
 973         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
 974
 975 }
 976
 977 static void
 978 interface_ip_valid_until_handler(struct uloop_timeout *t)
 979 {
 980         time_t now = system_get_rtime();
 981         struct interface *iface;
 982         vlist_for_each_element(&interfaces, iface, node) {
 983                 if (iface->state != IFS_UP)
 984                         continue;
 985
 986                 struct device_addr *addr, *addrp;
 987                 struct device_route *route, *routep;
 988                 struct device_prefix *pref, *prefp;
 989
 990                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
 991                         if (addr->valid_until && addr->valid_until < now)
 992                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
 993
 994                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
 995                         if (route->valid_until && route->valid_until < now)
 996                                 vlist_delete(&iface->proto_ip.route, &route->node);
 997
 998                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
 999                         if (pref->valid_until && pref->valid_until < now)
1000                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1001
1002         }
1003
1004         uloop_timeout_set(t, 1000);
1005 }
1006
1007 static void __init
1008 interface_ip_init_worker(void)
1009 {
1010         valid_until_timeout.cb = interface_ip_valid_until_handler;
1011         uloop_timeout_set(&valid_until_timeout, 1000);
1012 }