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 <limits.h>
  21 #include <arpa/inet.h>
  22
  23 #include "netifd.h"
  24 #include "device.h"
  25 #include "interface.h"
  26 #include "interface-ip.h"
  27 #include "proto.h"
  28 #include "ubus.h"
  29 #include "system.h"
  30
  31 enum {
  32         ROUTE_INTERFACE,
  33         ROUTE_TARGET,
  34         ROUTE_MASK,
  35         ROUTE_GATEWAY,
  36         ROUTE_METRIC,
  37         ROUTE_MTU,
  38         ROUTE_VALID,
  39         ROUTE_TABLE,
  40         __ROUTE_MAX
  41 };
  42
  43 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  44         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  45         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  46         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  47         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  48         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  49         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  50         [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
  51         [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  52 };
  53
  54 const struct config_param_list route_attr_list = {
  55         .n_params = __ROUTE_MAX,
  56         .params = route_attr,
  57 };
  58
  59
  60 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  61 static struct device_prefix *ula_prefix = NULL;
  62 static struct uloop_timeout valid_until_timeout;
  63
  64
  65 static void
  66 clear_if_addr(union if_addr *a, int mask)
  67 {
  68         int m_bytes = (mask + 7) / 8;
  69         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  70         uint8_t *p = (uint8_t *) a;
  71
  72         if (m_bytes < sizeof(a))
  73                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  74
  75         p[m_bytes - 1] &= ~m_clear;
  76 }
  77
  78 static bool
  79 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  80 {
  81         union if_addr *p1, *p2;
  82
  83         p1 = alloca(sizeof(*a1));
  84         p2 = alloca(sizeof(*a2));
  85
  86         memcpy(p1, a1, sizeof(*a1));
  87         clear_if_addr(p1, mask);
  88         memcpy(p2, a2, sizeof(*a2));
  89         clear_if_addr(p2, mask);
  90
  91         return !memcmp(p1, p2, sizeof(*p1));
  92 }
  93
  94 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
  95                 const union if_addr *addr, uint8_t mask, struct interface *iface)
  96 {
  97
  98
  99         struct iprule rule = {
 100                 .flags = IPRULE_SRC | IPRULE_LOOKUP | IPRULE_PRIORITY,
 101                 .priority = priority,
 102                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 103                 .src_addr = *addr,
 104                 .src_mask = mask,
 105         };
 106
 107         if (!rule.lookup)
 108                 return 0;
 109
 110         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 111
 112         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 113 }
 114
 115 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 116 {
 117         struct iprule rule = {
 118                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 119                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 120                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 121                 .in_dev = "lo"
 122         };
 123
 124         if (!rule.lookup)
 125                 return 0;
 126
 127         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 128
 129         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 130 }
 131
 132 static bool
 133 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 134 {
 135         struct device_addr *addr;
 136
 137         vlist_for_each_element(&ip->addr, addr, node) {
 138                 if (!addr->enabled)
 139                         continue;
 140
 141                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 142                         continue;
 143
 144                 // Handle offlink addresses correctly
 145                 unsigned int mask = addr->mask;
 146                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 147                                 (addr->flags & DEVADDR_OFFLINK))
 148                         mask = 128;
 149
 150                 if (!match_if_addr(&addr->addr, a, mask))
 151                         continue;
 152
 153                 return true;
 154         }
 155
 156         return false;
 157 }
 158
 159 static void
 160 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 161                        bool v6, struct device_route **res)
 162 {
 163         struct device_route *route;
 164
 165         vlist_for_each_element(&ip->route, route, node) {
 166                 if (!route->enabled)
 167                         continue;
 168
 169                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 170                         continue;
 171
 172                 if (!match_if_addr(&route->addr, a, route->mask))
 173                         continue;
 174
 175                 if (route->flags & DEVROUTE_TABLE)
 176                         continue;
 177
 178                 if (!*res || route->mask < (*res)->mask)
 179                         *res = route;
 180         }
 181 }
 182
 183 static bool
 184 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 185 {
 186         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 187                __find_ip_addr_target(&iface->config_ip, a, v6);
 188 }
 189
 190 static void
 191 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 192                                bool v6, struct device_route **route)
 193 {
 194         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 195         __find_ip_route_target(&iface->config_ip, a, v6, route);
 196 }
 197
 198 struct interface *
 199 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 200 {
 201         struct device_route *route, *r_next = NULL;
 202         bool defaultroute_target = false;
 203         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 204
 205         route = calloc(1, sizeof(*route));
 206         if (!route)
 207                 return NULL;
 208
 209         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 210         route->mask = v6 ? 128 : 32;
 211         if (memcmp(&route->addr, addr, addrsize) == 0)
 212                 defaultroute_target = true;
 213         else
 214                 memcpy(&route->addr, addr, addrsize);
 215
 216         if (iface) {
 217                 /* look for locally addressable target first */
 218                 if (interface_ip_find_addr_target(iface, addr, v6))
 219                         goto done;
 220
 221                 /* do not stop at the first route, let the lookup compare
 222                  * masks to find the best match */
 223                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 224         } else {
 225                 vlist_for_each_element(&interfaces, iface, node) {
 226                         /* look for locally addressable target first */
 227                         if (interface_ip_find_addr_target(iface, addr, v6))
 228                                 goto done;
 229
 230                         /* do not stop at the first route, let the lookup compare
 231                          * masks to find the best match */
 232                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 233                 }
 234         }
 235
 236         if (!r_next) {
 237                 free(route);
 238                 return NULL;
 239         }
 240
 241         iface = r_next->iface;
 242         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 243         route->mtu = r_next->mtu;
 244         route->metric = r_next->metric;
 245         route->table = r_next->table;
 246
 247 done:
 248         route->iface = iface;
 249         if (defaultroute_target)
 250                 free(route);
 251         else
 252                 vlist_add(&iface->host_routes, &route->node, route);
 253         return iface;
 254 }
 255
 256 void
 257 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 258 {
 259         struct interface_ip_settings *ip;
 260         struct blob_attr *tb[__ROUTE_MAX], *cur;
 261         struct device_route *route;
 262         int af = v6 ? AF_INET6 : AF_INET;
 263         bool is_proto_route = !!iface;
 264
 265         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 266
 267         if (!iface) {
 268                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 269                         return;
 270
 271                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 272                 if (!iface)
 273                         return;
 274
 275                 ip = &iface->config_ip;
 276         } else {
 277                 ip = &iface->proto_ip;
 278         }
 279
 280         route = calloc(1, sizeof(*route));
 281         if (!route)
 282                 return;
 283
 284         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 285         route->mask = v6 ? 128 : 32;
 286         if ((cur = tb[ROUTE_MASK]) != NULL) {
 287                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 288                 if (route->mask > (v6 ? 128 : 32))
 289                         goto error;
 290         }
 291
 292         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 293                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 294                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 295                         goto error;
 296                 }
 297         }
 298
 299         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 300                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 301                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 302                         goto error;
 303                 }
 304         }
 305
 306         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 307                 route->metric = blobmsg_get_u32(cur);
 308                 route->flags |= DEVROUTE_METRIC;
 309         }
 310
 311         if ((cur = tb[ROUTE_MTU]) != NULL) {
 312                 route->mtu = blobmsg_get_u32(cur);
 313                 route->flags |= DEVROUTE_MTU;
 314         }
 315
 316         // Use source-based routing
 317         if (is_proto_route) {
 318                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 319                 route->flags |= DEVROUTE_SRCTABLE;
 320         }
 321
 322         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 323                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 324                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 325                         goto error;
 326                 }
 327
 328                 if (route->table)
 329                         route->flags |= DEVROUTE_TABLE;
 330         }
 331
 332         if ((cur = tb[ROUTE_VALID]) != NULL) {
 333                 int64_t valid = blobmsg_get_u32(cur);
 334                 int64_t valid_until = valid + (int64_t)system_get_rtime();
 335                 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
 336                         route->valid_until = valid_until;
 337         }
 338
 339         vlist_add(&ip->route, &route->node, route);
 340         return;
 341
 342 error:
 343         free(route);
 344 }
 345
 346 static int
 347 addr_cmp(const void *k1, const void *k2, void *ptr)
 348 {
 349         return memcmp(k1, k2, sizeof(struct device_addr) -
 350                       offsetof(struct device_addr, flags));
 351 }
 352
 353 static int
 354 route_cmp(const void *k1, const void *k2, void *ptr)
 355 {
 356         const struct device_route *r1 = k1, *r2 = k2;
 357
 358         if (r1->mask != r2->mask)
 359                 return r2->mask - r1->mask;
 360
 361         if (r1->metric != r2->metric)
 362                 return r1->metric - r2->metric;
 363
 364         if (r1->flags != r2->flags)
 365                 return r2->flags - r1->flags;
 366
 367         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 368 }
 369
 370 static int
 371 prefix_cmp(const void *k1, const void *k2, void *ptr)
 372 {
 373         return memcmp(k1, k2, sizeof(struct device_prefix) -
 374                         offsetof(struct device_prefix, addr));
 375 }
 376
 377 static void
 378 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 379 {
 380         struct device *dev = iface->l3_dev.dev;
 381         struct device_route route;
 382
 383         memset(&route, 0, sizeof(route));
 384         route.iface = iface;
 385         route.flags = addr->flags;
 386         route.mask = addr->mask;
 387         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 388         clear_if_addr(&route.addr, route.mask);
 389
 390         if (add) {
 391                 route.flags |= DEVADDR_KERNEL;
 392                 system_del_route(dev, &route);
 393
 394                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 395                         route.flags &= ~DEVADDR_KERNEL;
 396                         route.metric = iface->metric;
 397                         system_add_route(dev, &route);
 398                 }
 399         } else {
 400                 if (!(addr->flags & DEVADDR_OFFLINK))
 401                         system_del_route(dev, &route);
 402         }
 403 }
 404
 405 static void
 406 interface_update_proto_addr(struct vlist_tree *tree,
 407                             struct vlist_node *node_new,
 408                             struct vlist_node *node_old)
 409 {
 410         struct interface_ip_settings *ip;
 411         struct interface *iface;
 412         struct device *dev;
 413         struct device_addr *a_new = NULL, *a_old = NULL;
 414         bool keep = false;
 415         bool v6 = false;
 416
 417         ip = container_of(tree, struct interface_ip_settings, addr);
 418         iface = ip->iface;
 419         dev = iface->l3_dev.dev;
 420
 421         if (node_new) {
 422                 a_new = container_of(node_new, struct device_addr, node);
 423
 424                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 425                     !a_new->broadcast) {
 426
 427                         uint32_t mask = ~0;
 428                         uint32_t *a = (uint32_t *) &a_new->addr;
 429
 430                         mask >>= a_new->mask;
 431                         a_new->broadcast = *a | htonl(mask);
 432                 }
 433         }
 434
 435         if (node_old)
 436                 a_old = container_of(node_old, struct device_addr, node);
 437
 438         if (a_new && a_old) {
 439                 keep = true;
 440
 441                 if (a_old->flags != a_new->flags ||
 442                                 a_old->valid_until != a_new->valid_until ||
 443                                 a_old->preferred_until != a_new->preferred_until)
 444                         keep = false;
 445
 446                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 447                     a_new->broadcast != a_old->broadcast)
 448                         keep = false;
 449         }
 450
 451         if (node_old) {
 452                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 453                         interface_handle_subnet_route(iface, a_old, false);
 454
 455                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 456                                 v6 = true;
 457
 458                         //This is needed for source routing to work correctly. If a device
 459                         //has two connections to a network using the same subnet, adding
 460                         //only the network-rule will cause packets to be routed through the
 461                         //first matching network (source IP matches both masks).
 462                         set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
 463                                 (v6) ? 128 : 32, iface);
 464                         set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
 465                                 a_old->mask, iface);
 466
 467                         system_del_address(dev, a_old);
 468                 }
 469                 free(a_old);
 470         }
 471
 472         if (node_new) {
 473                 a_new->enabled = true;
 474                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 475                         system_add_address(dev, a_new);
 476
 477                         if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 478                                 v6 = true;
 479
 480                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
 481                                 (v6) ? 128 : 32, iface);
 482                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
 483                                 a_new->mask, iface);
 484
 485                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 486                                 interface_handle_subnet_route(iface, a_new, true);
 487                 }
 488         }
 489 }
 490
 491 static bool
 492 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 493 {
 494         if (ip->no_defaultroute && !route->mask)
 495                 return false;
 496
 497         return ip->enabled;
 498 }
 499
 500 static void
 501 interface_update_proto_route(struct vlist_tree *tree,
 502                              struct vlist_node *node_new,
 503                              struct vlist_node *node_old)
 504 {
 505         struct interface_ip_settings *ip;
 506         struct interface *iface;
 507         struct device *dev;
 508         struct device_route *route_old, *route_new;
 509         bool keep = false;
 510
 511         ip = container_of(tree, struct interface_ip_settings, route);
 512         iface = ip->iface;
 513         dev = iface->l3_dev.dev;
 514
 515         route_old = container_of(node_old, struct device_route, node);
 516         route_new = container_of(node_new, struct device_route, node);
 517
 518         if (node_old && node_new)
 519                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 520
 521         if (node_old) {
 522                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 523                         system_del_route(dev, route_old);
 524                 free(route_old);
 525         }
 526
 527         if (node_new) {
 528                 bool _enabled = enable_route(ip, route_new);
 529
 530                 if (!(route_new->flags & DEVROUTE_METRIC))
 531                         route_new->metric = iface->metric;
 532
 533                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 534                         system_add_route(dev, route_new);
 535
 536                 route_new->iface = iface;
 537                 route_new->enabled = _enabled;
 538         }
 539 }
 540
 541 static void
 542 interface_update_host_route(struct vlist_tree *tree,
 543                              struct vlist_node *node_new,
 544                              struct vlist_node *node_old)
 545 {
 546         struct interface *iface;
 547         struct device *dev;
 548         struct device_route *route_old, *route_new;
 549
 550         iface = container_of(tree, struct interface, host_routes);
 551         dev = iface->l3_dev.dev;
 552
 553         route_old = container_of(node_old, struct device_route, node);
 554         route_new = container_of(node_new, struct device_route, node);
 555
 556         if (node_old) {
 557                 system_del_route(dev, route_old);
 558                 free(route_old);
 559         }
 560
 561         if (node_new)
 562                 system_add_route(dev, route_new);
 563 }
 564
 565
 566 static void
 567 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 568                 const struct device_prefix *prefix, struct interface *iface, bool add);
 569
 570 static void interface_trigger_ula_prefix(struct interface *iface,
 571                 const struct device_prefix *prefix, bool enable)
 572 {
 573         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 574                 return;
 575
 576         bool external_ula = false;
 577         struct device_prefix_assignment *ula_assign = NULL;
 578         struct device_prefix *c;
 579         list_for_each_entry(c, &prefixes, head) {
 580                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 581                         continue;
 582
 583                 struct device_prefix_assignment *a;
 584                 list_for_each_entry(a, &c->assignments, head) {
 585                         if (!strcmp(a->name, iface->name)) {
 586                                 if (c == ula_prefix)
 587                                         ula_assign = a;
 588                                 else if (a->enabled)
 589                                         external_ula = true;
 590                         }
 591                 }
 592
 593         }
 594
 595         // Remove ULA assignment if there is an externally managed ULA and vice versa
 596         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 597                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 598 }
 599
 600
 601 static void
 602 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 603                 const struct device_prefix *prefix, struct interface *iface, bool add)
 604 {
 605         const struct interface *uplink = prefix->iface;
 606         if (!iface->l3_dev.dev)
 607                 return;
 608
 609         struct device *l3_downlink = iface->l3_dev.dev;
 610
 611         struct device_addr addr;
 612         memset(&addr, 0, sizeof(addr));
 613         addr.addr.in6 = prefix->addr;
 614         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 615         addr.addr.in6.s6_addr[15] += 1;
 616         addr.mask = assignment->length;
 617         addr.flags = DEVADDR_INET6;
 618         addr.preferred_until = prefix->preferred_until;
 619         addr.valid_until = prefix->valid_until;
 620
 621         if (!add && assignment->enabled) {
 622                 time_t now = system_get_rtime();
 623                 addr.preferred_until = now;
 624                 if (!addr.valid_until || addr.valid_until - now > 7200)
 625                         addr.valid_until = now + 7200;
 626                 system_add_address(l3_downlink, &addr);
 627                 assignment->enabled = false;
 628
 629                 interface_trigger_ula_prefix(iface, prefix, true);
 630         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 631                 system_add_address(l3_downlink, &addr);
 632                 if (uplink && uplink->l3_dev.dev) {
 633                         int mtu = system_update_ipv6_mtu(
 634                                         uplink->l3_dev.dev, 0);
 635                         if (mtu > 0)
 636                                 system_update_ipv6_mtu(l3_downlink, mtu);
 637                 }
 638                 assignment->enabled = true;
 639
 640                 interface_trigger_ula_prefix(iface, prefix, false);
 641         }
 642 }
 643
 644 static bool interface_prefix_assign(struct list_head *list,
 645                 struct device_prefix_assignment *assign)
 646 {
 647         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 648         struct device_prefix_assignment *c;
 649         list_for_each_entry(c, list, head) {
 650                 if (assign->assigned != -1) {
 651                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 652                                 list_add_tail(&assign->head, &c->head);
 653                                 return true;
 654                         }
 655                 } else if (assign->assigned == -1) {
 656                         current = (current + asize) & (~asize);
 657                         if (current + asize < c->assigned) {
 658                                 assign->assigned = current;
 659                                 list_add_tail(&assign->head, &c->head);
 660                                 return true;
 661                         }
 662                 }
 663                 current = (c->assigned + (1 << (64 - c->length)));
 664         }
 665         return false;
 666 }
 667
 668 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 669 {
 670         struct device_prefix_assignment *c;
 671         struct interface *iface;
 672
 673         // Delete all assignments
 674         while (!list_empty(&prefix->assignments)) {
 675                 c = list_first_entry(&prefix->assignments,
 676                                 struct device_prefix_assignment, head);
 677                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 678                         interface_set_prefix_address(c, prefix, iface, false);
 679                 list_del(&c->head);
 680                 free(c);
 681         }
 682
 683         if (!setup)
 684                 return;
 685
 686         // End-of-assignment sentinel
 687         c = malloc(sizeof(*c) + 1);
 688         c->assigned = 1 << (64 - prefix->length);
 689         c->length = 64;
 690         c->name[0] = 0;
 691         list_add(&c->head, &prefix->assignments);
 692
 693         // Excluded prefix
 694         if (prefix->excl_length > 0) {
 695                 const char name[] = "!excluded";
 696                 c = malloc(sizeof(*c) + sizeof(name));
 697                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 698                                 ((1 << (64 - prefix->length)) - 1);
 699                 c->length = prefix->excl_length;
 700                 memcpy(c->name, name, sizeof(name));
 701                 list_add(&c->head, &prefix->assignments);
 702         }
 703
 704         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 705         vlist_for_each_element(&interfaces, iface, node) {
 706                 if (iface->config_ip.assignment_length < 48 ||
 707                                 iface->config_ip.assignment_length > 64)
 708                         continue;
 709
 710                 size_t namelen = strlen(iface->name) + 1;
 711                 c = malloc(sizeof(*c) + namelen);
 712                 c->length = iface->config_ip.assignment_length;
 713                 c->assigned = iface->config_ip.assignment_hint;
 714                 c->enabled = false;
 715                 memcpy(c->name, iface->name, namelen);
 716
 717                 // First process all custom assignments, put all others in later-list
 718                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 719                         if (c->assigned != -1) {
 720                                 c->assigned = -1;
 721                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 722                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 723                         }
 724                         list_add_tail(&c->head, &assign_later);
 725                 }
 726         }
 727
 728         // Then try to assign all other + failed custom assignments
 729         while (!list_empty(&assign_later)) {
 730                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 731                 list_del(&c->head);
 732
 733                 bool assigned = false;
 734                 do {
 735                         assigned = interface_prefix_assign(&prefix->assignments, c);
 736                 } while (!assigned && ++c->length <= 64);
 737
 738                 if (!assigned) {
 739                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 740                                         "of size %hhu for %s\n", c->length, c->name);
 741                         free(c);
 742                 }
 743         }
 744
 745         list_for_each_entry(c, &prefix->assignments, head)
 746                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 747                         interface_set_prefix_address(c, prefix, iface, true);
 748 }
 749
 750
 751 void interface_refresh_assignments(bool hint)
 752 {
 753         static bool refresh = false;
 754         if (!hint && refresh) {
 755                 struct device_prefix *p;
 756                 list_for_each_entry(p, &prefixes, head)
 757                         interface_update_prefix_assignments(p, true);
 758         }
 759         refresh = hint;
 760 }
 761
 762
 763 static void
 764 interface_update_prefix(struct vlist_tree *tree,
 765                              struct vlist_node *node_new,
 766                              struct vlist_node *node_old)
 767 {
 768         struct device_prefix *prefix_old, *prefix_new;
 769         prefix_old = container_of(node_old, struct device_prefix, node);
 770         prefix_new = container_of(node_new, struct device_prefix, node);
 771
 772         struct device_route route;
 773         memset(&route, 0, sizeof(route));
 774         route.flags = DEVADDR_INET6;
 775         route.metric = INT32_MAX;
 776         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 777         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 778
 779
 780         struct device_prefix_assignment *c;
 781         struct interface *iface;
 782
 783         if (node_old && node_new) {
 784                 // Move assignments and refresh addresses to update valid times
 785                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 786
 787                 list_for_each_entry(c, &prefix_new->assignments, head)
 788                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 789                                 interface_set_prefix_address(c, prefix_new, iface, true);
 790         } else if (node_new) {
 791                 // Set null-route to avoid routing loops and set routing policy
 792                 system_add_route(NULL, &route);
 793                 if (prefix_new->iface)
 794                         set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &route.addr,
 795                                         route.mask, prefix_new->iface);
 796
 797
 798                 interface_update_prefix_assignments(prefix_new, true);
 799         } else if (node_old) {
 800                 interface_update_prefix_assignments(prefix_old, false);
 801
 802                 // Remove null-route
 803                 if (prefix_old->iface)
 804                         set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &route.addr,
 805                                         route.mask, prefix_old->iface);
 806                 system_del_route(NULL, &route);
 807         }
 808
 809         if (node_old) {
 810                 list_del(&prefix_old->head);
 811                 free(prefix_old);
 812         }
 813
 814         if (node_new)
 815                 list_add(&prefix_new->head, &prefixes);
 816
 817 }
 818
 819 struct device_prefix*
 820 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 821                 uint8_t length, time_t valid_until, time_t preferred_until,
 822                 struct in6_addr *excl_addr, uint8_t excl_length)
 823 {
 824         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 825         prefix->length = length;
 826         prefix->addr = *addr;
 827         prefix->preferred_until = preferred_until;
 828         prefix->valid_until = valid_until;
 829         prefix->iface = iface;
 830         INIT_LIST_HEAD(&prefix->assignments);
 831
 832         if (excl_addr) {
 833                 prefix->excl_addr = *excl_addr;
 834                 prefix->excl_length = excl_length;
 835         }
 836
 837         if (iface)
 838                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 839         else
 840                 interface_update_prefix(NULL, &prefix->node, NULL);
 841
 842         return prefix;
 843 }
 844
 845 void
 846 interface_ip_set_ula_prefix(const char *prefix)
 847 {
 848         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 849         if (prefix)
 850                 strncpy(buf, prefix, sizeof(buf) - 1);
 851         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 852
 853         struct in6_addr addr;
 854         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 855                 if (ula_prefix) {
 856                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 857                         ula_prefix = NULL;
 858                 }
 859                 return;
 860         }
 861
 862         int length;
 863         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 864         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 865                 return;
 866
 867         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 868                         ula_prefix->length != length) {
 869                 if (ula_prefix)
 870                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 871
 872                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 873                                 0, 0, NULL, 0);
 874         }
 875 }
 876
 877 void
 878 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 879 {
 880         struct dns_server *s;
 881
 882         s = calloc(1, sizeof(*s));
 883         if (!s)
 884                 return;
 885
 886         s->af = AF_INET;
 887         if (inet_pton(s->af, str, &s->addr.in))
 888                 goto add;
 889
 890         s->af = AF_INET6;
 891         if (inet_pton(s->af, str, &s->addr.in))
 892                 goto add;
 893
 894         free(s);
 895         return;
 896
 897 add:
 898         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 899           s->af == AF_INET6 ? '6' : '4', str);
 900         vlist_simple_add(&ip->dns_servers, &s->node);
 901 }
 902
 903 void
 904 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 905 {
 906         struct blob_attr *cur;
 907         int rem;
 908
 909         blobmsg_for_each_attr(cur, list, rem) {
 910                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 911                         continue;
 912
 913                 if (!blobmsg_check_attr(cur, NULL))
 914                         continue;
 915
 916                 interface_add_dns_server(ip, blobmsg_data(cur));
 917         }
 918 }
 919
 920 static void
 921 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 922 {
 923         struct dns_search_domain *s;
 924         int len = strlen(str);
 925
 926         s = calloc(1, sizeof(*s) + len + 1);
 927         if (!s)
 928                 return;
 929
 930         D(INTERFACE, "Add DNS search domain: %s\n", str);
 931         memcpy(s->name, str, len);
 932         vlist_simple_add(&ip->dns_search, &s->node);
 933 }
 934
 935 void
 936 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 937 {
 938         struct blob_attr *cur;
 939         int rem;
 940
 941         blobmsg_for_each_attr(cur, list, rem) {
 942                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 943                         continue;
 944
 945                 if (!blobmsg_check_attr(cur, NULL))
 946                         continue;
 947
 948                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 949         }
 950 }
 951
 952 static void
 953 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 954 {
 955         struct dns_server *s;
 956         struct dns_search_domain *d;
 957         const char *str;
 958         char buf[INET6_ADDRSTRLEN];
 959
 960         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 961                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 962                 if (!str)
 963                         continue;
 964
 965                 fprintf(f, "nameserver %s\n", str);
 966         }
 967
 968         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 969                 fprintf(f, "search %s\n", d->name);
 970         }
 971 }
 972
 973 void
 974 interface_write_resolv_conf(void)
 975 {
 976         struct interface *iface;
 977         char *path = alloca(strlen(resolv_conf) + 5);
 978         FILE *f;
 979         uint32_t crcold, crcnew;
 980
 981         sprintf(path, "%s.tmp", resolv_conf);
 982         unlink(path);
 983         f = fopen(path, "w+");
 984         if (!f) {
 985                 D(INTERFACE, "Failed to open %s for writing\n", path);
 986                 return;
 987         }
 988
 989         vlist_for_each_element(&interfaces, iface, node) {
 990                 if (iface->state != IFS_UP)
 991                         continue;
 992
 993                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 994                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 995                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 996                     vlist_simple_empty(&iface->config_ip.dns_servers))
 997                         continue;
 998
 999                 fprintf(f, "# Interface %s\n", iface->name);
1000                 write_resolv_conf_entries(f, &iface->config_ip);
1001                 if (!iface->proto_ip.no_dns)
1002                         write_resolv_conf_entries(f, &iface->proto_ip);
1003         }
1004         fflush(f);
1005         rewind(f);
1006         crcnew = crc32_file(f);
1007         fclose(f);
1008
1009         crcold = crcnew + 1;
1010         f = fopen(resolv_conf, "r");
1011         if (f) {
1012                 crcold = crc32_file(f);
1013                 fclose(f);
1014         }
1015
1016         if (crcold == crcnew) {
1017                 unlink(path);
1018         } else if (rename(path, resolv_conf) < 0) {
1019                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1020                 unlink(path);
1021         }
1022 }
1023
1024 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1025 {
1026         struct device_addr *addr;
1027         struct device_route *route;
1028         struct device *dev;
1029
1030         ip->enabled = enabled;
1031         dev = ip->iface->l3_dev.dev;
1032         if (!dev)
1033                 return;
1034
1035         vlist_for_each_element(&ip->addr, addr, node) {
1036                 if (addr->enabled == enabled)
1037                         continue;
1038
1039                 if (enabled)
1040                         system_add_address(dev, addr);
1041                 else
1042                         system_del_address(dev, addr);
1043                 addr->enabled = enabled;
1044         }
1045
1046         vlist_for_each_element(&ip->route, route, node) {
1047                 bool _enabled = enabled;
1048
1049                 if (!enable_route(ip, route))
1050                         _enabled = false;
1051
1052                 if (route->enabled == _enabled)
1053                         continue;
1054
1055                 if (_enabled) {
1056                         if (!(route->flags & DEVROUTE_METRIC))
1057                                 route->metric = ip->iface->metric;
1058
1059                         system_add_route(dev, route);
1060                 } else
1061                         system_del_route(dev, route);
1062                 route->enabled = _enabled;
1063         }
1064
1065         struct device_prefix *c;
1066         struct device_prefix_assignment *a;
1067         list_for_each_entry(c, &prefixes, head)
1068                 list_for_each_entry(a, &c->assignments, head)
1069                         if (!strcmp(a->name, ip->iface->name))
1070                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1071
1072         set_ip_lo_policy(enabled, true, ip->iface);
1073         set_ip_lo_policy(enabled, false, ip->iface);
1074 }
1075
1076 void
1077 interface_ip_update_start(struct interface_ip_settings *ip)
1078 {
1079         if (ip != &ip->iface->config_ip) {
1080                 vlist_simple_update(&ip->dns_servers);
1081                 vlist_simple_update(&ip->dns_search);
1082         }
1083         vlist_update(&ip->route);
1084         vlist_update(&ip->addr);
1085         vlist_update(&ip->prefix);
1086 }
1087
1088 void
1089 interface_ip_update_complete(struct interface_ip_settings *ip)
1090 {
1091         vlist_simple_flush(&ip->dns_servers);
1092         vlist_simple_flush(&ip->dns_search);
1093         vlist_flush(&ip->route);
1094         vlist_flush(&ip->addr);
1095         vlist_flush(&ip->prefix);
1096         interface_write_resolv_conf();
1097 }
1098
1099 void
1100 interface_ip_flush(struct interface_ip_settings *ip)
1101 {
1102         if (ip == &ip->iface->proto_ip)
1103                 vlist_flush_all(&ip->iface->host_routes);
1104         vlist_simple_flush_all(&ip->dns_servers);
1105         vlist_simple_flush_all(&ip->dns_search);
1106         vlist_flush_all(&ip->route);
1107         vlist_flush_all(&ip->addr);
1108         vlist_flush_all(&ip->prefix);
1109 }
1110
1111 static void
1112 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1113 {
1114         ip->iface = iface;
1115         ip->enabled = true;
1116         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1117         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1118         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1119         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1120         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1121 }
1122
1123 void
1124 interface_ip_init(struct interface *iface)
1125 {
1126         __interface_ip_init(&iface->proto_ip, iface);
1127         __interface_ip_init(&iface->config_ip, iface);
1128         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1129
1130 }
1131
1132 static void
1133 interface_ip_valid_until_handler(struct uloop_timeout *t)
1134 {
1135         time_t now = system_get_rtime();
1136         struct interface *iface;
1137         vlist_for_each_element(&interfaces, iface, node) {
1138                 if (iface->state != IFS_UP)
1139                         continue;
1140
1141                 struct device_addr *addr, *addrp;
1142                 struct device_route *route, *routep;
1143                 struct device_prefix *pref, *prefp;
1144
1145                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1146                         if (addr->valid_until && addr->valid_until < now)
1147                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1148
1149                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1150                         if (route->valid_until && route->valid_until < now)
1151                                 vlist_delete(&iface->proto_ip.route, &route->node);
1152
1153                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1154                         if (pref->valid_until && pref->valid_until < now)
1155                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1156
1157         }
1158
1159         uloop_timeout_set(t, 1000);
1160 }
1161
1162 static void __init
1163 interface_ip_init_worker(void)
1164 {
1165         valid_until_timeout.cb = interface_ip_valid_until_handler;
1166         uloop_timeout_set(&valid_until_timeout, 1000);
1167 }