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 int set_ipv6_lo_policy(bool add, int ifindex)
 107 {
 108         struct iprule rule = {
 109                 .flags = IPRULE_INET6 | IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 110                 .priority = 65535,
 111                 .lookup = interface_ip_resolve_v6_rtable(ifindex),
 112                 .in_dev = "lo"
 113         };
 114
 115         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 116 }
 117
 118 static bool
 119 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 120 {
 121         struct device_addr *addr;
 122
 123         vlist_for_each_element(&ip->addr, addr, node) {
 124                 if (!addr->enabled)
 125                         continue;
 126
 127                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 128                         continue;
 129
 130                 // Handle offlink addresses correctly
 131                 unsigned int mask = addr->mask;
 132                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 133                                 (addr->flags & DEVADDR_OFFLINK))
 134                         mask = 128;
 135
 136                 if (!match_if_addr(&addr->addr, a, mask))
 137                         continue;
 138
 139                 return true;
 140         }
 141
 142         return false;
 143 }
 144
 145 static void
 146 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 147                        bool v6, struct device_route **res)
 148 {
 149         struct device_route *route;
 150
 151         vlist_for_each_element(&ip->route, route, node) {
 152                 if (!route->enabled)
 153                         continue;
 154
 155                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 156                         continue;
 157
 158                 if (!match_if_addr(&route->addr, a, route->mask))
 159                         continue;
 160
 161                 if (route->flags & DEVROUTE_TABLE)
 162                         continue;
 163
 164                 if (!*res || route->mask < (*res)->mask)
 165                         *res = route;
 166         }
 167 }
 168
 169 static bool
 170 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 171 {
 172         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 173                __find_ip_addr_target(&iface->config_ip, a, v6);
 174 }
 175
 176 static void
 177 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 178                                bool v6, struct device_route **route)
 179 {
 180         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 181         __find_ip_route_target(&iface->config_ip, a, v6, route);
 182 }
 183
 184 struct interface *
 185 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 186 {
 187         struct device_route *route, *r_next = NULL;
 188         bool defaultroute_target = false;
 189         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 190
 191         route = calloc(1, sizeof(*route));
 192         if (!route)
 193                 return NULL;
 194
 195         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 196         route->mask = v6 ? 128 : 32;
 197         if (memcmp(&route->addr, addr, addrsize) == 0)
 198                 defaultroute_target = true;
 199         else
 200                 memcpy(&route->addr, addr, addrsize);
 201
 202         if (iface) {
 203                 /* look for locally addressable target first */
 204                 if (interface_ip_find_addr_target(iface, addr, v6))
 205                         goto done;
 206
 207                 /* do not stop at the first route, let the lookup compare
 208                  * masks to find the best match */
 209                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 210         } else {
 211                 vlist_for_each_element(&interfaces, iface, node) {
 212                         /* look for locally addressable target first */
 213                         if (interface_ip_find_addr_target(iface, addr, v6))
 214                                 goto done;
 215
 216                         /* do not stop at the first route, let the lookup compare
 217                          * masks to find the best match */
 218                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 219                 }
 220         }
 221
 222         if (!r_next) {
 223                 free(route);
 224                 return NULL;
 225         }
 226
 227         iface = r_next->iface;
 228         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 229         route->mtu = r_next->mtu;
 230         route->metric = r_next->metric;
 231         route->table = r_next->table;
 232
 233 done:
 234         route->iface = iface;
 235         if (defaultroute_target)
 236                 free(route);
 237         else
 238                 vlist_add(&iface->host_routes, &route->node, route);
 239         return iface;
 240 }
 241
 242 void
 243 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 244 {
 245         struct interface_ip_settings *ip;
 246         struct blob_attr *tb[__ROUTE_MAX], *cur;
 247         struct device_route *route;
 248         int af = v6 ? AF_INET6 : AF_INET;
 249         bool is_v6_proto_route = v6 && iface;
 250
 251         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 252
 253         if (!iface) {
 254                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 255                         return;
 256
 257                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 258                 if (!iface)
 259                         return;
 260
 261                 ip = &iface->config_ip;
 262         } else {
 263                 ip = &iface->proto_ip;
 264         }
 265
 266         route = calloc(1, sizeof(*route));
 267         if (!route)
 268                 return;
 269
 270         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 271         route->mask = v6 ? 128 : 32;
 272         if ((cur = tb[ROUTE_MASK]) != NULL) {
 273                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 274                 if (route->mask > (v6 ? 128 : 32))
 275                         goto error;
 276         }
 277
 278         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 279                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 280                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 281                         goto error;
 282                 }
 283         }
 284
 285         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 286                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 287                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 288                         goto error;
 289                 }
 290         }
 291
 292         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 293                 route->metric = blobmsg_get_u32(cur);
 294                 route->flags |= DEVROUTE_METRIC;
 295         }
 296
 297         if ((cur = tb[ROUTE_MTU]) != NULL) {
 298                 route->mtu = blobmsg_get_u32(cur);
 299                 route->flags |= DEVROUTE_MTU;
 300         }
 301
 302         // Use source-based routing
 303         if (is_v6_proto_route) {
 304                 route->table = interface_ip_resolve_v6_rtable(iface->l3_dev.dev->ifindex);
 305                 route->flags |= DEVROUTE_SRCTABLE;
 306         }
 307
 308         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 309                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 310                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 311                         goto error;
 312                 }
 313
 314                 if (route->table)
 315                         route->flags |= DEVROUTE_TABLE;
 316         }
 317
 318         if ((cur = tb[ROUTE_VALID]) != NULL)
 319                 route->valid_until = system_get_rtime() + blobmsg_get_u32(cur);
 320
 321         vlist_add(&ip->route, &route->node, route);
 322         return;
 323
 324 error:
 325         free(route);
 326 }
 327
 328 static int
 329 addr_cmp(const void *k1, const void *k2, void *ptr)
 330 {
 331         return memcmp(k1, k2, sizeof(struct device_addr) -
 332                       offsetof(struct device_addr, flags));
 333 }
 334
 335 static int
 336 route_cmp(const void *k1, const void *k2, void *ptr)
 337 {
 338         const struct device_route *r1 = k1, *r2 = k2;
 339
 340         if (r1->mask != r2->mask)
 341                 return r2->mask - r1->mask;
 342
 343         if (r1->metric != r2->metric)
 344                 return r1->metric - r2->metric;
 345
 346         if (r1->flags != r2->flags)
 347                 return r2->flags - r1->flags;
 348
 349         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 350 }
 351
 352 static int
 353 prefix_cmp(const void *k1, const void *k2, void *ptr)
 354 {
 355         return memcmp(k1, k2, sizeof(struct device_prefix) -
 356                         offsetof(struct device_prefix, addr));
 357 }
 358
 359 static void
 360 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 361 {
 362         struct device *dev = iface->l3_dev.dev;
 363         struct device_route route;
 364
 365         memset(&route, 0, sizeof(route));
 366         route.iface = iface;
 367         route.flags = addr->flags;
 368         route.mask = addr->mask;
 369         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 370         clear_if_addr(&route.addr, route.mask);
 371
 372         if (add) {
 373                 route.flags |= DEVADDR_KERNEL;
 374                 system_del_route(dev, &route);
 375
 376                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 377                         route.flags &= ~DEVADDR_KERNEL;
 378                         route.metric = iface->metric;
 379                         system_add_route(dev, &route);
 380                 }
 381         } else {
 382                 if (!(addr->flags & DEVADDR_OFFLINK))
 383                         system_del_route(dev, &route);
 384         }
 385 }
 386
 387 static void
 388 interface_update_proto_addr(struct vlist_tree *tree,
 389                             struct vlist_node *node_new,
 390                             struct vlist_node *node_old)
 391 {
 392         struct interface_ip_settings *ip;
 393         struct interface *iface;
 394         struct device *dev;
 395         struct device_addr *a_new = NULL, *a_old = NULL;
 396         bool keep = false;
 397
 398         ip = container_of(tree, struct interface_ip_settings, addr);
 399         iface = ip->iface;
 400         dev = iface->l3_dev.dev;
 401
 402         if (node_new) {
 403                 a_new = container_of(node_new, struct device_addr, node);
 404
 405                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 406                     !a_new->broadcast) {
 407
 408                         uint32_t mask = ~0;
 409                         uint32_t *a = (uint32_t *) &a_new->addr;
 410
 411                         mask >>= a_new->mask;
 412                         a_new->broadcast = *a | htonl(mask);
 413                 }
 414         }
 415
 416         if (node_old)
 417                 a_old = container_of(node_old, struct device_addr, node);
 418
 419         if (a_new && a_old) {
 420                 keep = true;
 421
 422                 if (a_old->flags != a_new->flags ||
 423                                 a_old->valid_until != a_new->valid_until ||
 424                                 a_old->preferred_until != a_new->preferred_until)
 425                         keep = false;
 426
 427                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 428                     a_new->broadcast != a_old->broadcast)
 429                         keep = false;
 430         }
 431
 432         if (node_old) {
 433                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 434                         interface_handle_subnet_route(iface, a_old, false);
 435
 436                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 437                                 set_ipv6_source_policy(false, &a_old->addr, a_old->mask, dev->ifindex);
 438
 439                         system_del_address(dev, a_old);
 440                 }
 441                 free(a_old);
 442         }
 443
 444         if (node_new) {
 445                 a_new->enabled = true;
 446                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep) {
 447                         system_add_address(dev, a_new);
 448
 449                         if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 450                                 set_ipv6_source_policy(true, &a_new->addr, a_new->mask, dev->ifindex);
 451
 452                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 453                                 interface_handle_subnet_route(iface, a_new, true);
 454                 }
 455         }
 456 }
 457
 458 static bool
 459 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 460 {
 461         if (ip->no_defaultroute && !route->mask)
 462                 return false;
 463
 464         return ip->enabled;
 465 }
 466
 467 static void
 468 interface_update_proto_route(struct vlist_tree *tree,
 469                              struct vlist_node *node_new,
 470                              struct vlist_node *node_old)
 471 {
 472         struct interface_ip_settings *ip;
 473         struct interface *iface;
 474         struct device *dev;
 475         struct device_route *route_old, *route_new;
 476         bool keep = false;
 477
 478         ip = container_of(tree, struct interface_ip_settings, route);
 479         iface = ip->iface;
 480         dev = iface->l3_dev.dev;
 481
 482         route_old = container_of(node_old, struct device_route, node);
 483         route_new = container_of(node_new, struct device_route, node);
 484
 485         if (node_old && node_new)
 486                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 487
 488         if (node_old) {
 489                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 490                         system_del_route(dev, route_old);
 491                 free(route_old);
 492         }
 493
 494         if (node_new) {
 495                 bool _enabled = enable_route(ip, route_new);
 496
 497                 if (!(route_new->flags & DEVROUTE_METRIC))
 498                         route_new->metric = iface->metric;
 499
 500                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 501                         system_add_route(dev, route_new);
 502
 503                 route_new->iface = iface;
 504                 route_new->enabled = _enabled;
 505         }
 506 }
 507
 508 static void
 509 interface_update_host_route(struct vlist_tree *tree,
 510                              struct vlist_node *node_new,
 511                              struct vlist_node *node_old)
 512 {
 513         struct interface *iface;
 514         struct device *dev;
 515         struct device_route *route_old, *route_new;
 516
 517         iface = container_of(tree, struct interface, host_routes);
 518         dev = iface->l3_dev.dev;
 519
 520         route_old = container_of(node_old, struct device_route, node);
 521         route_new = container_of(node_new, struct device_route, node);
 522
 523         if (node_old) {
 524                 system_del_route(dev, route_old);
 525                 free(route_old);
 526         }
 527
 528         if (node_new)
 529                 system_add_route(dev, route_new);
 530 }
 531
 532
 533 static void
 534 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 535                 const struct device_prefix *prefix, struct interface *iface, bool add);
 536
 537 static void interface_trigger_ula_prefix(struct interface *iface,
 538                 const struct device_prefix *prefix, bool enable)
 539 {
 540         if (prefix == ula_prefix || (prefix->addr.s6_addr[0] & 0xfe) != 0xfc)
 541                 return;
 542
 543         bool external_ula = false;
 544         struct device_prefix_assignment *ula_assign = NULL;
 545         struct device_prefix *c;
 546         list_for_each_entry(c, &prefixes, head) {
 547                 if (c != ula_prefix && (c->addr.s6_addr[0] & 0xfe) != 0xfc)
 548                         continue;
 549
 550                 struct device_prefix_assignment *a;
 551                 list_for_each_entry(a, &c->assignments, head) {
 552                         if (!strcmp(a->name, iface->name)) {
 553                                 if (c == ula_prefix)
 554                                         ula_assign = a;
 555                                 else if (a->enabled)
 556                                         external_ula = true;
 557                         }
 558                 }
 559
 560         }
 561
 562         // Remove ULA assignment if there is an externally managed ULA and vice versa
 563         if (ula_assign && ((enable && !external_ula) || (!enable && external_ula)))
 564                 interface_set_prefix_address(ula_assign, ula_prefix, iface, enable);
 565 }
 566
 567
 568 static void
 569 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 570                 const struct device_prefix *prefix, struct interface *iface, bool add)
 571 {
 572         const struct interface *uplink = prefix->iface;
 573         if (!iface->l3_dev.dev)
 574                 return;
 575
 576         struct device *l3_downlink = iface->l3_dev.dev;
 577
 578         struct device_addr addr;
 579         memset(&addr, 0, sizeof(addr));
 580         addr.addr.in6 = prefix->addr;
 581         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 582         addr.addr.in6.s6_addr[15] += 1;
 583         addr.mask = assignment->length;
 584         addr.flags = DEVADDR_INET6;
 585         addr.preferred_until = prefix->preferred_until;
 586         addr.valid_until = prefix->valid_until;
 587
 588         if (!add && assignment->enabled) {
 589                 time_t now = system_get_rtime();
 590                 addr.preferred_until = now;
 591                 if (!addr.valid_until || addr.valid_until - now > 7200)
 592                         addr.valid_until = now + 7200;
 593                 system_add_address(l3_downlink, &addr);
 594                 assignment->enabled = false;
 595
 596                 interface_trigger_ula_prefix(iface, prefix, true);
 597         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 598                 system_add_address(l3_downlink, &addr);
 599                 if (uplink && uplink->l3_dev.dev) {
 600                         int mtu = system_update_ipv6_mtu(
 601                                         uplink->l3_dev.dev, 0);
 602                         if (mtu > 0)
 603                                 system_update_ipv6_mtu(l3_downlink, mtu);
 604                 }
 605                 assignment->enabled = true;
 606
 607                 interface_trigger_ula_prefix(iface, prefix, false);
 608         }
 609 }
 610
 611 static bool interface_prefix_assign(struct list_head *list,
 612                 struct device_prefix_assignment *assign)
 613 {
 614         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 615         struct device_prefix_assignment *c;
 616         list_for_each_entry(c, list, head) {
 617                 if (assign->assigned != -1) {
 618                         if (assign->assigned > current && assign->assigned + asize < c->assigned) {
 619                                 list_add_tail(&assign->head, &c->head);
 620                                 return true;
 621                         }
 622                 } else if (assign->assigned == -1) {
 623                         current = (current + asize) & (~asize);
 624                         if (current + asize < c->assigned) {
 625                                 assign->assigned = current;
 626                                 list_add_tail(&assign->head, &c->head);
 627                                 return true;
 628                         }
 629                 }
 630                 current = (c->assigned + (1 << (64 - c->length)));
 631         }
 632         return false;
 633 }
 634
 635 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 636 {
 637         struct device_prefix_assignment *c;
 638         struct interface *iface;
 639
 640         // Delete all assignments
 641         while (!list_empty(&prefix->assignments)) {
 642                 c = list_first_entry(&prefix->assignments,
 643                                 struct device_prefix_assignment, head);
 644                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 645                         interface_set_prefix_address(c, prefix, iface, false);
 646                 list_del(&c->head);
 647                 free(c);
 648         }
 649
 650         if (!setup)
 651                 return;
 652
 653         // End-of-assignment sentinel
 654         c = malloc(sizeof(*c) + 1);
 655         c->assigned = 1 << (64 - prefix->length);
 656         c->length = 64;
 657         c->name[0] = 0;
 658         list_add(&c->head, &prefix->assignments);
 659
 660         // Excluded prefix
 661         if (prefix->excl_length > 0) {
 662                 const char name[] = "!excluded";
 663                 c = malloc(sizeof(*c) + sizeof(name));
 664                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 665                                 ((1 << (64 - prefix->length)) - 1);
 666                 c->length = prefix->excl_length;
 667                 memcpy(c->name, name, sizeof(name));
 668                 list_add(&c->head, &prefix->assignments);
 669         }
 670
 671         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 672         vlist_for_each_element(&interfaces, iface, node) {
 673                 if (iface->config_ip.assignment_length < 48 ||
 674                                 iface->config_ip.assignment_length > 64)
 675                         continue;
 676
 677                 size_t namelen = strlen(iface->name) + 1;
 678                 c = malloc(sizeof(*c) + namelen);
 679                 c->length = iface->config_ip.assignment_length;
 680                 c->assigned = iface->config_ip.assignment_hint;
 681                 c->enabled = false;
 682                 memcpy(c->name, iface->name, namelen);
 683
 684                 // First process all custom assignments, put all others in later-list
 685                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 686                         if (c->assigned != -1) {
 687                                 c->assigned = -1;
 688                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 689                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 690                         }
 691                         list_add_tail(&c->head, &assign_later);
 692                 }
 693         }
 694
 695         // Then try to assign all other + failed custom assignments
 696         while (!list_empty(&assign_later)) {
 697                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 698                 list_del(&c->head);
 699
 700                 bool assigned = false;
 701                 do {
 702                         assigned = interface_prefix_assign(&prefix->assignments, c);
 703                 } while (!assigned && ++c->length <= 64);
 704
 705                 if (!assigned) {
 706                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 707                                         "of size %hhu for %s\n", c->length, c->name);
 708                         free(c);
 709                 }
 710         }
 711
 712         list_for_each_entry(c, &prefix->assignments, head)
 713                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 714                         interface_set_prefix_address(c, prefix, iface, true);
 715 }
 716
 717
 718 void interface_refresh_assignments(bool hint)
 719 {
 720         static bool refresh = false;
 721         if (!hint && refresh) {
 722                 struct device_prefix *p;
 723                 list_for_each_entry(p, &prefixes, head)
 724                         interface_update_prefix_assignments(p, true);
 725         }
 726         refresh = hint;
 727 }
 728
 729
 730 static void
 731 interface_update_prefix(struct vlist_tree *tree,
 732                              struct vlist_node *node_new,
 733                              struct vlist_node *node_old)
 734 {
 735         struct device_prefix *prefix_old, *prefix_new;
 736         prefix_old = container_of(node_old, struct device_prefix, node);
 737         prefix_new = container_of(node_new, struct device_prefix, node);
 738
 739         struct device_route route;
 740         memset(&route, 0, sizeof(route));
 741         route.flags = DEVADDR_INET6;
 742         route.metric = INT32_MAX;
 743         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 744         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 745
 746
 747         struct device_prefix_assignment *c;
 748         struct interface *iface;
 749
 750         if (node_old && node_new) {
 751                 // Move assignments and refresh addresses to update valid times
 752                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 753
 754                 list_for_each_entry(c, &prefix_new->assignments, head)
 755                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 756                                 interface_set_prefix_address(c, prefix_new, iface, true);
 757         } else if (node_new) {
 758                 // Set null-route to avoid routing loops and set routing policy
 759                 system_add_route(NULL, &route);
 760                 if (prefix_new->iface)
 761                         set_ipv6_source_policy(true, &route.addr, route.mask,
 762                                         prefix_new->iface->l3_dev.dev->ifindex);
 763
 764
 765                 interface_update_prefix_assignments(prefix_new, true);
 766         } else if (node_old) {
 767                 interface_update_prefix_assignments(prefix_old, false);
 768
 769                 // Remove null-route
 770                 if (prefix_old->iface)
 771                         set_ipv6_source_policy(false, &route.addr, route.mask,
 772                                         prefix_old->iface->l3_dev.dev->ifindex);
 773                 system_del_route(NULL, &route);
 774         }
 775
 776         if (node_old) {
 777                 list_del(&prefix_old->head);
 778                 free(prefix_old);
 779         }
 780
 781         if (node_new)
 782                 list_add(&prefix_new->head, &prefixes);
 783
 784 }
 785
 786 struct device_prefix*
 787 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 788                 uint8_t length, time_t valid_until, time_t preferred_until,
 789                 struct in6_addr *excl_addr, uint8_t excl_length)
 790 {
 791         struct device_prefix *prefix = calloc(1, sizeof(*prefix));
 792         prefix->length = length;
 793         prefix->addr = *addr;
 794         prefix->preferred_until = preferred_until;
 795         prefix->valid_until = valid_until;
 796         prefix->iface = iface;
 797         INIT_LIST_HEAD(&prefix->assignments);
 798
 799         if (excl_addr) {
 800                 prefix->excl_addr = *excl_addr;
 801                 prefix->excl_length = excl_length;
 802         }
 803
 804         if (iface)
 805                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 806         else
 807                 interface_update_prefix(NULL, &prefix->node, NULL);
 808
 809         return prefix;
 810 }
 811
 812 void
 813 interface_ip_set_ula_prefix(const char *prefix)
 814 {
 815         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 816         if (prefix)
 817                 strncpy(buf, prefix, sizeof(buf) - 1);
 818         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 819
 820         struct in6_addr addr;
 821         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 822                 if (ula_prefix) {
 823                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 824                         ula_prefix = NULL;
 825                 }
 826                 return;
 827         }
 828
 829         int length;
 830         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 831         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 832                 return;
 833
 834         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 835                         ula_prefix->length != length) {
 836                 if (ula_prefix)
 837                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 838
 839                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 840                                 0, 0, NULL, 0);
 841         }
 842 }
 843
 844 int interface_ip_resolve_v6_rtable(int ifindex)
 845 {
 846         return ifindex + 1000;
 847 }
 848
 849 void
 850 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 851 {
 852         struct dns_server *s;
 853
 854         s = calloc(1, sizeof(*s));
 855         if (!s)
 856                 return;
 857
 858         s->af = AF_INET;
 859         if (inet_pton(s->af, str, &s->addr.in))
 860                 goto add;
 861
 862         s->af = AF_INET6;
 863         if (inet_pton(s->af, str, &s->addr.in))
 864                 goto add;
 865
 866         free(s);
 867         return;
 868
 869 add:
 870         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 871           s->af == AF_INET6 ? '6' : '4', str);
 872         vlist_simple_add(&ip->dns_servers, &s->node);
 873 }
 874
 875 void
 876 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 877 {
 878         struct blob_attr *cur;
 879         int rem;
 880
 881         blobmsg_for_each_attr(cur, list, rem) {
 882                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 883                         continue;
 884
 885                 if (!blobmsg_check_attr(cur, NULL))
 886                         continue;
 887
 888                 interface_add_dns_server(ip, blobmsg_data(cur));
 889         }
 890 }
 891
 892 static void
 893 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 894 {
 895         struct dns_search_domain *s;
 896         int len = strlen(str);
 897
 898         s = calloc(1, sizeof(*s) + len + 1);
 899         if (!s)
 900                 return;
 901
 902         D(INTERFACE, "Add DNS search domain: %s\n", str);
 903         memcpy(s->name, str, len);
 904         vlist_simple_add(&ip->dns_search, &s->node);
 905 }
 906
 907 void
 908 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 909 {
 910         struct blob_attr *cur;
 911         int rem;
 912
 913         blobmsg_for_each_attr(cur, list, rem) {
 914                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 915                         continue;
 916
 917                 if (!blobmsg_check_attr(cur, NULL))
 918                         continue;
 919
 920                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 921         }
 922 }
 923
 924 static void
 925 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 926 {
 927         struct dns_server *s;
 928         struct dns_search_domain *d;
 929         const char *str;
 930         char buf[INET6_ADDRSTRLEN];
 931
 932         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 933                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 934                 if (!str)
 935                         continue;
 936
 937                 fprintf(f, "nameserver %s\n", str);
 938         }
 939
 940         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 941                 fprintf(f, "search %s\n", d->name);
 942         }
 943 }
 944
 945 void
 946 interface_write_resolv_conf(void)
 947 {
 948         struct interface *iface;
 949         char *path = alloca(strlen(resolv_conf) + 5);
 950         FILE *f;
 951         uint32_t crcold, crcnew;
 952
 953         sprintf(path, "%s.tmp", resolv_conf);
 954         unlink(path);
 955         f = fopen(path, "w+");
 956         if (!f) {
 957                 D(INTERFACE, "Failed to open %s for writing\n", path);
 958                 return;
 959         }
 960
 961         vlist_for_each_element(&interfaces, iface, node) {
 962                 if (iface->state != IFS_UP)
 963                         continue;
 964
 965                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 966                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 967                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 968                     vlist_simple_empty(&iface->config_ip.dns_servers))
 969                         continue;
 970
 971                 fprintf(f, "# Interface %s\n", iface->name);
 972                 write_resolv_conf_entries(f, &iface->config_ip);
 973                 if (!iface->proto_ip.no_dns)
 974                         write_resolv_conf_entries(f, &iface->proto_ip);
 975         }
 976         fflush(f);
 977         rewind(f);
 978         crcnew = crc32_file(f);
 979         fclose(f);
 980
 981         crcold = crcnew + 1;
 982         f = fopen(resolv_conf, "r");
 983         if (f) {
 984                 crcold = crc32_file(f);
 985                 fclose(f);
 986         }
 987
 988         if (crcold == crcnew) {
 989                 unlink(path);
 990         } else if (rename(path, resolv_conf) < 0) {
 991                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 992                 unlink(path);
 993         }
 994 }
 995
 996 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 997 {
 998         struct device_addr *addr;
 999         struct device_route *route;
1000         struct device *dev;
1001
1002         ip->enabled = enabled;
1003         dev = ip->iface->l3_dev.dev;
1004         if (!dev)
1005                 return;
1006
1007         vlist_for_each_element(&ip->addr, addr, node) {
1008                 if (addr->enabled == enabled)
1009                         continue;
1010
1011                 if (enabled)
1012                         system_add_address(dev, addr);
1013                 else
1014                         system_del_address(dev, addr);
1015                 addr->enabled = enabled;
1016         }
1017
1018         vlist_for_each_element(&ip->route, route, node) {
1019                 bool _enabled = enabled;
1020
1021                 if (!enable_route(ip, route))
1022                         _enabled = false;
1023
1024                 if (route->enabled == _enabled)
1025                         continue;
1026
1027                 if (_enabled) {
1028                         if (!(route->flags & DEVROUTE_METRIC))
1029                                 route->metric = ip->iface->metric;
1030
1031                         system_add_route(dev, route);
1032                 } else
1033                         system_del_route(dev, route);
1034                 route->enabled = _enabled;
1035         }
1036
1037         struct device_prefix *c;
1038         struct device_prefix_assignment *a;
1039         list_for_each_entry(c, &prefixes, head)
1040                 list_for_each_entry(a, &c->assignments, head)
1041                         if (!strcmp(a->name, ip->iface->name))
1042                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1043
1044         set_ipv6_lo_policy(enabled, dev->ifindex);
1045 }
1046
1047 void
1048 interface_ip_update_start(struct interface_ip_settings *ip)
1049 {
1050         if (ip != &ip->iface->config_ip) {
1051                 vlist_simple_update(&ip->dns_servers);
1052                 vlist_simple_update(&ip->dns_search);
1053         }
1054         vlist_update(&ip->route);
1055         vlist_update(&ip->addr);
1056         vlist_update(&ip->prefix);
1057 }
1058
1059 void
1060 interface_ip_update_complete(struct interface_ip_settings *ip)
1061 {
1062         vlist_simple_flush(&ip->dns_servers);
1063         vlist_simple_flush(&ip->dns_search);
1064         vlist_flush(&ip->route);
1065         vlist_flush(&ip->addr);
1066         vlist_flush(&ip->prefix);
1067         interface_write_resolv_conf();
1068 }
1069
1070 void
1071 interface_ip_flush(struct interface_ip_settings *ip)
1072 {
1073         if (ip == &ip->iface->proto_ip)
1074                 vlist_flush_all(&ip->iface->host_routes);
1075         vlist_simple_flush_all(&ip->dns_servers);
1076         vlist_simple_flush_all(&ip->dns_search);
1077         vlist_flush_all(&ip->route);
1078         vlist_flush_all(&ip->addr);
1079         vlist_flush_all(&ip->prefix);
1080 }
1081
1082 static void
1083 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1084 {
1085         ip->iface = iface;
1086         ip->enabled = true;
1087         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1088         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1089         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1090         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1091         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1092 }
1093
1094 void
1095 interface_ip_init(struct interface *iface)
1096 {
1097         __interface_ip_init(&iface->proto_ip, iface);
1098         __interface_ip_init(&iface->config_ip, iface);
1099         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1100
1101 }
1102
1103 static void
1104 interface_ip_valid_until_handler(struct uloop_timeout *t)
1105 {
1106         time_t now = system_get_rtime();
1107         struct interface *iface;
1108         vlist_for_each_element(&interfaces, iface, node) {
1109                 if (iface->state != IFS_UP)
1110                         continue;
1111
1112                 struct device_addr *addr, *addrp;
1113                 struct device_route *route, *routep;
1114                 struct device_prefix *pref, *prefp;
1115
1116                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1117                         if (addr->valid_until && addr->valid_until < now)
1118                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1119
1120                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1121                         if (route->valid_until && route->valid_until < now)
1122                                 vlist_delete(&iface->proto_ip.route, &route->node);
1123
1124                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1125                         if (pref->valid_until && pref->valid_until < now)
1126                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1127
1128         }
1129
1130         uloop_timeout_set(t, 1000);
1131 }
1132
1133 static void __init
1134 interface_ip_init_worker(void)
1135 {
1136         valid_until_timeout.cb = interface_ip_valid_until_handler;
1137         uloop_timeout_set(&valid_until_timeout, 1000);
1138 }