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 int set_ipv6_source_policy(bool add, const union if_addr *addr, uint8_t mask, int ifindex)
  94 {
  95         struct iprule rule = {
  96                 .flags = IPRULE_INET6 | IPRULE_SRC | IPRULE_LOOKUP | IPRULE_PRIORITY,
  97                 .priority = 65535,
  98                 .lookup = interface_ip_resolve_v6_rtable(ifindex),
  99                 .src_addr = *addr,
 100                 .src_mask = mask,
 101         };
 102
 103         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 104 }
 105
 106 static bool
 107 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 108 {
 109         struct device_addr *addr;
 110
 111         vlist_for_each_element(&ip->addr, addr, node) {
 112                 if (!addr->enabled)
 113                         continue;
 114
 115                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 116                         continue;
 117
 118                 // Handle offlink addresses correctly
 119                 unsigned int mask = addr->mask;
 120                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 121                                 (addr->flags & DEVADDR_OFFLINK))
 122                         mask = 128;
 123
 124                 if (!match_if_addr(&addr->addr, a, mask))
 125                         continue;
 126
 127                 return true;
 128         }
 129
 130         return false;
 131 }
 132
 133 static void
 134 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 135                        bool v6, struct device_route **res)
 136 {
 137         struct device_route *route;
 138
 139         vlist_for_each_element(&ip->route, route, node) {
 140                 if (!route->enabled)
 141                         continue;
 142
 143                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 144                         continue;
 145
 146                 if (!match_if_addr(&route->addr, a, route->mask))
 147                         continue;
 148
 149                 if (route->flags & DEVROUTE_TABLE)
 150                         continue;
 151
 152                 if (!*res || route->mask < (*res)->mask)
 153                         *res = route;
 154         }
 155 }
 156
 157 static bool
 158 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 159 {
 160         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 161                __find_ip_addr_target(&iface->config_ip, a, v6);
 162 }
 163
 164 static void
 165 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 166                                bool v6, struct device_route **route)
 167 {
 168         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 169         __find_ip_route_target(&iface->config_ip, a, v6, route);
 170 }
 171
 172 struct interface *
 173 interface_ip_add_target_route(union if_addr *addr, bool v6)
 174 {
 175         struct interface *iface;
 176         struct device_route *route, *r_next = NULL;
 177         bool defaultroute_target = false;
 178         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 179
 180         route = calloc(1, sizeof(*route));
 181         if (!route)
 182                 return NULL;
 183
 184         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 185         route->mask = v6 ? 128 : 32;
 186         if (memcmp(&route->addr, addr, addrsize) == 0)
 187                 defaultroute_target = true;
 188         else
 189                 memcpy(&route->addr, addr, addrsize);
 190
 191         vlist_for_each_element(&interfaces, iface, node) {
 192                 /* look for locally addressable target first */
 193                 if (interface_ip_find_addr_target(iface, addr, v6))
 194                         goto done;
 195
 196                 /* do not stop at the first route, let the lookup compare
 197                  * masks to find the best match */
 198                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 199         }
 200
 201         if (!r_next) {
 202                 free(route);
 203                 return NULL;
 204         }
 205
 206         iface = r_next->iface;
 207         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 208         route->mtu = r_next->mtu;
 209         route->metric = r_next->metric;
 210         route->table = r_next->table;
 211
 212 done:
 213         route->iface = iface;
 214         if (defaultroute_target)
 215                 free(route);
 216         else
 217                 vlist_add(&iface->host_routes, &route->node, route);
 218         return iface;
 219 }
 220
 221 void
 222 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 223 {
 224         struct interface_ip_settings *ip;
 225         struct blob_attr *tb[__ROUTE_MAX], *cur;
 226         struct device_route *route;
 227         int af = v6 ? AF_INET6 : AF_INET;
 228         bool is_v6_proto_route = v6 && iface;
 229
 230         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 231
 232         if (!iface) {
 233                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 234                         return;
 235
 236                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 237                 if (!iface)
 238                         return;
 239
 240                 ip = &iface->config_ip;
 241         } else {
 242                 ip = &iface->proto_ip;
 243         }
 244
 245         route = calloc(1, sizeof(*route));
 246         if (!route)
 247                 return;
 248
 249         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 250         route->mask = v6 ? 128 : 32;
 251         if ((cur = tb[ROUTE_MASK]) != NULL) {
 252                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 253                 if (route->mask > (v6 ? 128 : 32))
 254                         goto error;
 255         }
 256
 257         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 258                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 259                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 260                         goto error;
 261                 }
 262         }
 263
 264         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 265                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 266                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 267                         goto error;
 268                 }
 269         }
 270
 271         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 272                 route->metric = blobmsg_get_u32(cur);
 273                 route->flags |= DEVROUTE_METRIC;
 274         }
 275
 276         if ((cur = tb[ROUTE_MTU]) != NULL) {
 277                 route->mtu = blobmsg_get_u32(cur);
 278                 route->flags |= DEVROUTE_MTU;
 279         }
 280
 281         // Use source-based routing
 282         if (is_v6_proto_route) {
 283                 route->table = interface_ip_resolve_v6_rtable(iface->l3_dev.dev->ifindex);
 284                 route->flags |= DEVROUTE_SRCTABLE;
 285         }
 286
 287         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 288                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 289                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 290                         goto error;
 291                 }
 292
 293                 if (route->table)
 294                         route->flags |= DEVROUTE_TABLE;
 295         }
 296
 297         if ((cur = tb[ROUTE_VALID]) != NULL)
 298                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 299
 300         vlist_add(&ip->route, &route->node, route);
 301         return;
 302
 303 error:
 304         free(route);
 305 }
 306
 307 static int
 308 addr_cmp(const void *k1, const void *k2, void *ptr)
 309 {
 310         return memcmp(k1, k2, sizeof(struct device_addr) -
 311                       offsetof(struct device_addr, flags));
 312 }
 313
 314 static int
 315 route_cmp(const void *k1, const void *k2, void *ptr)
 316 {
 317         const struct device_route *r1 = k1, *r2 = k2;
 318
 319         if (r1->mask != r2->mask)
 320                 return r2->mask - r1->mask;
 321
 322         if (r1->metric != r2->metric)
 323                 return r1->metric - r2->metric;
 324
 325         if (r1->flags != r2->flags)
 326                 return r2->flags - r1->flags;
 327
 328         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 329 }
 330
 331 static int
 332 prefix_cmp(const void *k1, const void *k2, void *ptr)
 333 {
 334         return memcmp(k1, k2, sizeof(struct device_prefix) -
 335                         offsetof(struct device_prefix, addr));
 336 }
 337
 338 static void
 339 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 340 {
 341         struct device *dev = iface->l3_dev.dev;
 342         struct device_route route;
 343
 344         memset(&route, 0, sizeof(route));
 345         route.iface = iface;
 346         route.flags = addr->flags;
 347         route.mask = addr->mask;
 348         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 349         clear_if_addr(&route.addr, route.mask);
 350
 351         if (add) {
 352                 route.flags |= DEVADDR_KERNEL;
 353                 system_del_route(dev, &route);
 354
 355                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 356                         route.flags &= ~DEVADDR_KERNEL;
 357                         route.metric = iface->metric;
 358                         system_add_route(dev, &route);
 359                 }
 360         } else {
 361                 if (!(addr->flags & DEVADDR_OFFLINK))
 362                         system_del_route(dev, &route);
 363         }
 364 }
 365
 366 static void
 367 interface_update_proto_addr(struct vlist_tree *tree,
 368                             struct vlist_node *node_new,
 369                             struct vlist_node *node_old)
 370 {
 371         struct interface_ip_settings *ip;
 372         struct interface *iface;
 373         struct device *dev;
 374         struct device_addr *a_new = NULL, *a_old = NULL;
 375         bool keep = false;
 376
 377         ip = container_of(tree, struct interface_ip_settings, addr);
 378         iface = ip->iface;
 379         dev = iface->l3_dev.dev;
 380
 381         if (node_new) {
 382                 a_new = container_of(node_new, struct device_addr, node);
 383
 384                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 385                     !a_new->broadcast) {
 386
 387                         uint32_t mask = ~0;
 388                         uint32_t *a = (uint32_t *) &a_new->addr;
 389
 390                         mask >>= a_new->mask;
 391                         a_new->broadcast = *a | htonl(mask);
 392                 }
 393         }
 394
 395         if (node_old)
 396                 a_old = container_of(node_old, struct device_addr, node);
 397
 398         if (a_new && a_old) {
 399                 keep = true;
 400
 401                 if (a_old->flags != a_new->flags ||
 402                                 a_old->valid_until != a_new->valid_until ||
 403                                 a_old->preferred_until != a_new->preferred_until)
 404                         keep = false;
 405
 406                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 407                     a_new->broadcast != a_old->broadcast)
 408                         keep = false;
 409         }
 410
 411         if (node_old) {
 412                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 413                         interface_handle_subnet_route(iface, a_old, false);
 414
 415                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 416                                 set_ipv6_source_policy(false, &a_old->addr, a_old->mask, dev->ifindex);
 417
 418                         system_del_address(dev, a_old);
 419                 }
 420                 free(a_old);
 421         }
 422
 423         if (node_new) {
 424                 a_new->enabled = true;
 425                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 426                         system_add_address(dev, a_new);
 427
 428                         if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 429                                 set_ipv6_source_policy(true, &a_new->addr, a_new->mask, dev->ifindex);
 430
 431                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 432                                 interface_handle_subnet_route(iface, a_new, true);
 433                 }
 434         }
 435 }
 436
 437 static bool
 438 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 439 {
 440         if (ip->no_defaultroute && !route->mask)
 441                 return false;
 442
 443         return ip->enabled;
 444 }
 445
 446 static void
 447 interface_update_proto_route(struct vlist_tree *tree,
 448                              struct vlist_node *node_new,
 449                              struct vlist_node *node_old)
 450 {
 451         struct interface_ip_settings *ip;
 452         struct interface *iface;
 453         struct device *dev;
 454         struct device_route *route_old, *route_new;
 455         bool keep = false;
 456
 457         ip = container_of(tree, struct interface_ip_settings, route);
 458         iface = ip->iface;
 459         dev = iface->l3_dev.dev;
 460
 461         route_old = container_of(node_old, struct device_route, node);
 462         route_new = container_of(node_new, struct device_route, node);
 463
 464         if (node_old && node_new)
 465                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 466
 467         if (node_old) {
 468                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 469                         system_del_route(dev, route_old);
 470                 free(route_old);
 471         }
 472
 473         if (node_new) {
 474                 bool _enabled = enable_route(ip, route_new);
 475
 476                 if (!(route_new->flags & DEVROUTE_METRIC))
 477                         route_new->metric = iface->metric;
 478
 479                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 480                         system_add_route(dev, route_new);
 481
 482                 route_new->iface = iface;
 483                 route_new->enabled = _enabled;
 484         }
 485 }
 486
 487 static void
 488 interface_update_host_route(struct vlist_tree *tree,
 489                              struct vlist_node *node_new,
 490                              struct vlist_node *node_old)
 491 {
 492         struct interface *iface;
 493         struct device *dev;
 494         struct device_route *route_old, *route_new;
 495
 496         iface = container_of(tree, struct interface, host_routes);
 497         dev = iface->l3_dev.dev;
 498
 499         route_old = container_of(node_old, struct device_route, node);
 500         route_new = container_of(node_new, struct device_route, node);
 501
 502         if (node_old) {
 503                 system_del_route(dev, route_old);
 504                 free(route_old);
 505         }
 506
 507         if (node_new)
 508                 system_add_route(dev, route_new);
 509 }
 510
 511
 512 static void
 513 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 514                 const struct device_prefix *prefix, struct interface *iface, bool add);
 515
 516 static void interface_trigger_ula_prefix(struct interface *iface,
 517                 const struct device_prefix *prefix, bool enable)
 518 {
 519         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 520                 return;
 521
 522         bool external_ula = false;
 523         struct device_prefix_assignment *ula_assign = NULL;
 524         struct device_prefix *c;
 525         list_for_each_entry(c, &prefixes, head) {
 526                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 527                         continue;
 528
 529                 struct device_prefix_assignment *a;
 530                 list_for_each_entry(a, &c->assignments, head) {
 531                         if (!strcmp(a->name, iface->name)) {
 532                                 if (c == ula_prefix)
 533                                         ula_assign = a;
 534                                 else if (a->enabled)
 535                                         external_ula = true;
 536                         }
 537                 }
 538
 539         }
 540
 541         // Remove ULA assignment if there is an externally managed ULA and vice versa
 542         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 543                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 544 }
 545
 546
 547 static void
 548 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 549                 const struct device_prefix *prefix, struct interface *iface, bool add)
 550 {
 551         const struct interface *uplink = prefix->iface;
 552         if (!iface->l3_dev.dev)
 553                 return;
 554
 555         struct device *l3_downlink = iface->l3_dev.dev;
 556
 557         struct device_addr addr;
 558         memset(&addr, 0, sizeof(addr));
 559         addr.addr.in6 = prefix->addr;
 560         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 561         addr.addr.in6.s6_addr[15] += 1;
 562         addr.mask = assignment->length;
 563         addr.flags = DEVADDR_INET6;
 564         addr.preferred_until = prefix->preferred_until;
 565         addr.valid_until = prefix->valid_until;
 566
 567         if (!add && assignment->enabled) {
 568                 time_t now = system_get_rtime();
 569                 addr.preferred_until = now;
 570                 if (!addr.valid_until || addr.valid_until - now > 7200)
 571                         addr.valid_until = now + 7200;
 572                 system_add_address(l3_downlink, &addr);
 573                 assignment->enabled = false;
 574
 575                 interface_trigger_ula_prefix(iface, prefix, true);
 576         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 577                 system_add_address(l3_downlink, &addr);
 578                 if (uplink && uplink->l3_dev.dev) {
 579                         int mtu = system_update_ipv6_mtu(
 580                                         uplink->l3_dev.dev, 0);
 581                         if (mtu > 0)
 582                                 system_update_ipv6_mtu(l3_downlink, mtu);
 583                 }
 584                 assignment->enabled = true;
 585
 586                 interface_trigger_ula_prefix(iface, prefix, false);
 587         }
 588 }
 589
 590 static bool interface_prefix_assign(struct list_head *list,
 591                 struct device_prefix_assignment *assign)
 592 {
 593         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 594         struct device_prefix_assignment *c;
 595         list_for_each_entry(c, list, head) {
 596                 if (assign->assigned != -1) {
 597                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 598                                 list_add_tail(&assign->head, &c->head);
 599                                 return true;
 600                         }
 601                 } else if (assign->assigned == -1) {
 602                         current = (current + asize) & (~asize);
 603                         if (current + asize < c->assigned) {
 604                                 assign->assigned = current;
 605                                 list_add_tail(&assign->head, &c->head);
 606                                 return true;
 607                         }
 608                 }
 609                 current = (c->assigned + (1 << (64 - c->length)));
 610         }
 611         return false;
 612 }
 613
 614 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 615 {
 616         struct device_prefix_assignment *c;
 617         struct interface *iface;
 618
 619         // Delete all assignments
 620         while (!list_empty(&prefix->assignments)) {
 621                 c = list_first_entry(&prefix->assignments,
 622                                 struct device_prefix_assignment, head);
 623                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 624                         interface_set_prefix_address(c, prefix, iface, false);
 625                 list_del(&c->head);
 626                 free(c);
 627         }
 628
 629         if (!setup)
 630                 return;
 631
 632         // End-of-assignment sentinel
 633         c = malloc(sizeof(*c) + 1);
 634         c->assigned = 1 << (64 - prefix->length);
 635         c->length = 64;
 636         c->name[0] = 0;
 637         list_add(&c->head, &prefix->assignments);
 638
 639         // Excluded prefix
 640         if (prefix->excl_length > 0) {
 641                 const char name[] = "!excluded";
 642                 c = malloc(sizeof(*c) + sizeof(name));
 643                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 644                                 ((1 << (64 - prefix->length)) - 1);
 645                 c->length = prefix->excl_length;
 646                 memcpy(c->name, name, sizeof(name));
 647                 list_add(&c->head, &prefix->assignments);
 648         }
 649
 650         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 651         vlist_for_each_element(&interfaces, iface, node) {
 652                 if (iface->config_ip.assignment_length < 48 ||
 653                                 iface->config_ip.assignment_length > 64)
 654                         continue;
 655
 656                 size_t namelen = strlen(iface->name) + 1;
 657                 c = malloc(sizeof(*c) + namelen);
 658                 c->length = iface->config_ip.assignment_length;
 659                 c->assigned = iface->config_ip.assignment_hint;
 660                 c->enabled = false;
 661                 memcpy(c->name, iface->name, namelen);
 662
 663                 // First process all custom assignments, put all others in later-list
 664                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 665                         if (c->assigned != -1) {
 666                                 c->assigned = -1;
 667                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 668                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 669                         }
 670                         list_add_tail(&c->head, &assign_later);
 671                 }
 672         }
 673
 674         // Then try to assign all other + failed custom assignments
 675         while (!list_empty(&assign_later)) {
 676                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 677                 list_del(&c->head);
 678
 679                 bool assigned = false;
 680                 do {
 681                         assigned = interface_prefix_assign(&prefix->assignments, c);
 682                 } while (!assigned && ++c->length <= 64);
 683
 684                 if (!assigned) {
 685                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 686                                         "of size %hhu for %s\n", c->length, c->name);
 687                         free(c);
 688                 }
 689         }
 690
 691         list_for_each_entry(c, &prefix->assignments, head)
 692                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 693                         interface_set_prefix_address(c, prefix, iface, true);
 694 }
 695
 696
 697 void interface_refresh_assignments(bool hint)
 698 {
 699         static bool refresh = false;
 700         if (!hint && refresh) {
 701                 struct device_prefix *p;
 702                 list_for_each_entry(p, &prefixes, head)
 703                         interface_update_prefix_assignments(p, true);
 704         }
 705         refresh = hint;
 706 }
 707
 708
 709 static void
 710 interface_update_prefix(struct vlist_tree *tree,
 711                              struct vlist_node *node_new,
 712                              struct vlist_node *node_old)
 713 {
 714         struct device_prefix *prefix_old, *prefix_new;
 715         prefix_old = container_of(node_old, struct device_prefix, node);
 716         prefix_new = container_of(node_new, struct device_prefix, node);
 717
 718         struct device_route route;
 719         memset(&route, 0, sizeof(route));
 720         route.flags = DEVADDR_INET6;
 721         route.metric = INT32_MAX;
 722         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 723         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 724
 725
 726         struct device_prefix_assignment *c;
 727         struct interface *iface;
 728
 729         if (node_old && node_new) {
 730                 // Move assignments and refresh addresses to update valid times
 731                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 732
 733                 list_for_each_entry(c, &prefix_new->assignments, head)
 734                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 735                                 interface_set_prefix_address(c, prefix_new, iface, true);
 736         } else if (node_new) {
 737                 // Set null-route to avoid routing loops and set routing policy
 738                 system_add_route(NULL, &route);
 739                 if (prefix_new->iface)
 740                         set_ipv6_source_policy(true, &route.addr, route.mask,
 741                                         prefix_new->iface->l3_dev.dev->ifindex);
 742
 743
 744                 interface_update_prefix_assignments(prefix_new, true);
 745         } else if (node_old) {
 746                 interface_update_prefix_assignments(prefix_old, false);
 747
 748                 // Remove null-route
 749                 if (prefix_old->iface)
 750                         set_ipv6_source_policy(false, &route.addr, route.mask,
 751                                         prefix_old->iface->l3_dev.dev->ifindex);
 752                 system_del_route(NULL, &route);
 753         }
 754
 755         if (node_old) {
 756                 list_del(&prefix_old->head);
 757                 free(prefix_old);
 758         }
 759
 760         if (node_new)
 761                 list_add(&prefix_new->head, &prefixes);
 762
 763 }
 764
 765 struct device_prefix*
 766 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 767                 uint8_t length, time_t valid_until, time_t preferred_until,
 768                 struct in6_addr *excl_addr, uint8_t excl_length)
 769 {
 770         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 771         prefix->length = length;
 772         prefix->addr = *addr;
 773         prefix->preferred_until = preferred_until;
 774         prefix->valid_until = valid_until;
 775         prefix->iface = iface;
 776         INIT_LIST_HEAD(&prefix->assignments);
 777
 778         if (excl_addr) {
 779                 prefix->excl_addr = *excl_addr;
 780                 prefix->excl_length = excl_length;
 781         }
 782
 783         if (iface)
 784                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 785         else
 786                 interface_update_prefix(NULL, &prefix->node, NULL);
 787
 788         return prefix;
 789 }
 790
 791 void
 792 interface_ip_set_ula_prefix(const char *prefix)
 793 {
 794         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 795         if (prefix)
 796                 strncpy(buf, prefix, sizeof(buf) - 1);
 797         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 798
 799         struct in6_addr addr;
 800         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 801                 if (ula_prefix) {
 802                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 803                         ula_prefix = NULL;
 804                 }
 805                 return;
 806         }
 807
 808         int length;
 809         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 810         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 811                 return;
 812
 813         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 814                         ula_prefix->length != length) {
 815                 if (ula_prefix)
 816                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 817
 818                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 819                                 0, 0, NULL, 0);
 820         }
 821 }
 822
 823 int interface_ip_resolve_v6_rtable(int ifindex)
 824 {
 825         return ifindex + 1000;
 826 }
 827
 828 void
 829 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 830 {
 831         struct dns_server *s;
 832
 833         s = calloc(1, sizeof(*s));
 834         if (!s)
 835                 return;
 836
 837         s->af = AF_INET;
 838         if (inet_pton(s->af, str, &s->addr.in))
 839                 goto add;
 840
 841         s->af = AF_INET6;
 842         if (inet_pton(s->af, str, &s->addr.in))
 843                 goto add;
 844
 845         free(s);
 846         return;
 847
 848 add:
 849         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 850           s->af == AF_INET6 ? '6' : '4', str);
 851         vlist_simple_add(&ip->dns_servers, &s->node);
 852 }
 853
 854 void
 855 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 856 {
 857         struct blob_attr *cur;
 858         int rem;
 859
 860         blobmsg_for_each_attr(cur, list, rem) {
 861                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 862                         continue;
 863
 864                 if (!blobmsg_check_attr(cur, NULL))
 865                         continue;
 866
 867                 interface_add_dns_server(ip, blobmsg_data(cur));
 868         }
 869 }
 870
 871 static void
 872 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 873 {
 874         struct dns_search_domain *s;
 875         int len = strlen(str);
 876
 877         s = calloc(1, sizeof(*s) + len + 1);
 878         if (!s)
 879                 return;
 880
 881         D(INTERFACE, "Add DNS search domain: %s\n", str);
 882         memcpy(s->name, str, len);
 883         vlist_simple_add(&ip->dns_search, &s->node);
 884 }
 885
 886 void
 887 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 888 {
 889         struct blob_attr *cur;
 890         int rem;
 891
 892         blobmsg_for_each_attr(cur, list, rem) {
 893                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 894                         continue;
 895
 896                 if (!blobmsg_check_attr(cur, NULL))
 897                         continue;
 898
 899                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 900         }
 901 }
 902
 903 static void
 904 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 905 {
 906         struct dns_server *s;
 907         struct dns_search_domain *d;
 908         const char *str;
 909         char buf[INET6_ADDRSTRLEN];
 910
 911         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 912                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 913                 if (!str)
 914                         continue;
 915
 916                 fprintf(f, "nameserver %s\n", str);
 917         }
 918
 919         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 920                 fprintf(f, "search %s\n", d->name);
 921         }
 922 }
 923
 924 void
 925 interface_write_resolv_conf(void)
 926 {
 927         struct interface *iface;
 928         char *path = alloca(strlen(resolv_conf) + 5);
 929         FILE *f;
 930         uint32_t crcold, crcnew;
 931
 932         sprintf(path, "%s.tmp", resolv_conf);
 933         unlink(path);
 934         f = fopen(path, "w+");
 935         if (!f) {
 936                 D(INTERFACE, "Failed to open %s for writing\n", path);
 937                 return;
 938         }
 939
 940         vlist_for_each_element(&interfaces, iface, node) {
 941                 if (iface->state != IFS_UP)
 942                         continue;
 943
 944                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 945                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 946                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 947                     vlist_simple_empty(&iface->config_ip.dns_servers))
 948                         continue;
 949
 950                 fprintf(f, "# Interface %s\n", iface->name);
 951                 write_resolv_conf_entries(f, &iface->config_ip);
 952                 if (!iface->proto_ip.no_dns)
 953                         write_resolv_conf_entries(f, &iface->proto_ip);
 954         }
 955         fflush(f);
 956         rewind(f);
 957         crcnew = crc32_file(f);
 958         fclose(f);
 959
 960         crcold = crcnew + 1;
 961         f = fopen(resolv_conf, "r");
 962         if (f) {
 963                 crcold = crc32_file(f);
 964                 fclose(f);
 965         }
 966
 967         if (crcold == crcnew) {
 968                 unlink(path);
 969         } else if (rename(path, resolv_conf) < 0) {
 970                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 971                 unlink(path);
 972         }
 973 }
 974
 975 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 976 {
 977         struct device_addr *addr;
 978         struct device_route *route;
 979         struct device *dev;
 980
 981         ip->enabled = enabled;
 982         dev = ip->iface->l3_dev.dev;
 983         if (!dev)
 984                 return;
 985
 986         vlist_for_each_element(&ip->addr, addr, node) {
 987                 if (addr->enabled == enabled)
 988                         continue;
 989
 990                 if (enabled)
 991                         system_add_address(dev, addr);
 992                 else
 993                         system_del_address(dev, addr);
 994                 addr->enabled = enabled;
 995         }
 996
 997         vlist_for_each_element(&ip->route, route, node) {
 998                 bool _enabled = enabled;
 999
1000                 if (!enable_route(ip, route))
1001                         _enabled = false;
1002
1003                 if (route->enabled == _enabled)
1004                         continue;
1005
1006                 if (_enabled) {
1007                         if (!(route->flags & DEVROUTE_METRIC))
1008                                 route->metric = ip->iface->metric;
1009
1010                         system_add_route(dev, route);
1011                 } else
1012                         system_del_route(dev, route);
1013                 route->enabled = _enabled;
1014         }
1015
1016         struct device_prefix *c;
1017         struct device_prefix_assignment *a;
1018         list_for_each_entry(c, &prefixes, head)
1019                 list_for_each_entry(a, &c->assignments, head)
1020                         if (!strcmp(a->name, ip->iface->name))
1021                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1022 }
1023
1024 void
1025 interface_ip_update_start(struct interface_ip_settings *ip)
1026 {
1027         if (ip != &ip->iface->config_ip) {
1028                 vlist_simple_update(&ip->dns_servers);
1029                 vlist_simple_update(&ip->dns_search);
1030         }
1031         vlist_update(&ip->route);
1032         vlist_update(&ip->addr);
1033         vlist_update(&ip->prefix);
1034 }
1035
1036 void
1037 interface_ip_update_complete(struct interface_ip_settings *ip)
1038 {
1039         vlist_simple_flush(&ip->dns_servers);
1040         vlist_simple_flush(&ip->dns_search);
1041         vlist_flush(&ip->route);
1042         vlist_flush(&ip->addr);
1043         vlist_flush(&ip->prefix);
1044         interface_write_resolv_conf();
1045 }
1046
1047 void
1048 interface_ip_flush(struct interface_ip_settings *ip)
1049 {
1050         if (ip == &ip->iface->proto_ip)
1051                 vlist_flush_all(&ip->iface->host_routes);
1052         vlist_simple_flush_all(&ip->dns_servers);
1053         vlist_simple_flush_all(&ip->dns_search);
1054         vlist_flush_all(&ip->route);
1055         vlist_flush_all(&ip->addr);
1056         vlist_flush_all(&ip->prefix);
1057 }
1058
1059 static void
1060 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1061 {
1062         ip->iface = iface;
1063         ip->enabled = true;
1064         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1065         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1066         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1067         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1068         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1069 }
1070
1071 void
1072 interface_ip_init(struct interface *iface)
1073 {
1074         __interface_ip_init(&iface->proto_ip, iface);
1075         __interface_ip_init(&iface->config_ip, iface);
1076         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1077
1078 }
1079
1080 static void
1081 interface_ip_valid_until_handler(struct uloop_timeout *t)
1082 {
1083         time_t now = system_get_rtime();
1084         struct interface *iface;
1085         vlist_for_each_element(&interfaces, iface, node) {
1086                 if (iface->state != IFS_UP)
1087                         continue;
1088
1089                 struct device_addr *addr, *addrp;
1090                 struct device_route *route, *routep;
1091                 struct device_prefix *pref, *prefp;
1092
1093                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1094                         if (addr->valid_until && addr->valid_until < now)
1095                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1096
1097                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1098                         if (route->valid_until && route->valid_until < now)
1099                                 vlist_delete(&iface->proto_ip.route, &route->node);
1100
1101                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1102                         if (pref->valid_until && pref->valid_until < now)
1103                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1104
1105         }
1106
1107         uloop_timeout_set(t, 1000);
1108 }
1109
1110 static void __init
1111 interface_ip_init_worker(void)
1112 {
1113         valid_until_timeout.cb = interface_ip_valid_until_handler;
1114         uloop_timeout_set(&valid_until_timeout, 1000);
1115 }