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
  19 #include <limits.h>
  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_SOURCE,
  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         [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
  53 };
  54
  55 const struct uci_blob_param_list route_attr_list = {
  56         .n_params = __ROUTE_MAX,
  57         .params = route_attr,
  58 };
  59
  60
  61 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
  62 static struct device_prefix *ula_prefix = NULL;
  63 static struct uloop_timeout valid_until_timeout;
  64
  65
  66 static void
  67 clear_if_addr(union if_addr *a, int mask)
  68 {
  69         int m_bytes = (mask + 7) / 8;
  70         uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
  71         uint8_t *p = (uint8_t *) a;
  72
  73         if (m_bytes < sizeof(a))
  74                 memset(p + m_bytes, 0, sizeof(a) - m_bytes);
  75
  76         p[m_bytes - 1] &= ~m_clear;
  77 }
  78
  79 static bool
  80 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
  81 {
  82         union if_addr *p1, *p2;
  83
  84         p1 = alloca(sizeof(*a1));
  85         p2 = alloca(sizeof(*a2));
  86
  87         memcpy(p1, a1, sizeof(*a1));
  88         clear_if_addr(p1, mask);
  89         memcpy(p2, a2, sizeof(*a2));
  90         clear_if_addr(p2, mask);
  91
  92         return !memcmp(p1, p2, sizeof(*p1));
  93 }
  94
  95 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
  96                 const union if_addr *addr, uint8_t mask, unsigned int table,
  97                 struct interface *in_iface, const char *action)
  98 {
  99         struct iprule rule = {
 100                 .flags = IPRULE_PRIORITY,
 101                 .priority = priority
 102         };
 103
 104         if (addr) {
 105                 rule.flags |= IPRULE_SRC;
 106                 rule.src_addr = *addr;
 107                 rule.src_mask = mask;
 108         }
 109
 110         if (table) {
 111                 rule.flags |= IPRULE_LOOKUP;
 112                 rule.lookup = table;
 113
 114                 if (!rule.lookup)
 115                         return 0;
 116         } else if (action) {
 117                 rule.flags |= IPRULE_ACTION;
 118                 system_resolve_iprule_action(action, &rule.action);
 119         }
 120
 121         if (in_iface && in_iface->l3_dev.dev) {
 122                 rule.flags |= IPRULE_IN;
 123                 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
 124         }
 125
 126         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 127
 128         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 129 }
 130
 131 static int set_ip_lo_policy(bool add, bool v6, struct interface *iface)
 132 {
 133         struct iprule rule = {
 134                 .flags = IPRULE_IN | IPRULE_LOOKUP | IPRULE_PRIORITY,
 135                 .priority = IPRULE_PRIORITY_NW + iface->l3_dev.dev->ifindex,
 136                 .lookup = (v6) ? iface->ip6table : iface->ip4table,
 137                 .in_dev = "lo"
 138         };
 139
 140         if (!rule.lookup)
 141                 return 0;
 142
 143         rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
 144
 145         return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
 146 }
 147
 148 static bool
 149 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
 150 {
 151         struct device_addr *addr;
 152
 153         vlist_for_each_element(&ip->addr, addr, node) {
 154                 if (!addr->enabled)
 155                         continue;
 156
 157                 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 158                         continue;
 159
 160                 // Handle offlink addresses correctly
 161                 unsigned int mask = addr->mask;
 162                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
 163                                 (addr->flags & DEVADDR_OFFLINK))
 164                         mask = 128;
 165
 166                 if (!match_if_addr(&addr->addr, a, mask))
 167                         continue;
 168
 169                 return true;
 170         }
 171
 172         return false;
 173 }
 174
 175 static void
 176 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
 177                        bool v6, struct device_route **res)
 178 {
 179         struct device_route *route;
 180
 181         vlist_for_each_element(&ip->route, route, node) {
 182                 if (!route->enabled)
 183                         continue;
 184
 185                 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
 186                         continue;
 187
 188                 if (!match_if_addr(&route->addr, a, route->mask))
 189                         continue;
 190
 191                 if (route->flags & DEVROUTE_TABLE)
 192                         continue;
 193
 194                 if (!*res || route->mask < (*res)->mask)
 195                         *res = route;
 196         }
 197 }
 198
 199 static bool
 200 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
 201 {
 202         return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
 203                __find_ip_addr_target(&iface->config_ip, a, v6);
 204 }
 205
 206 static void
 207 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
 208                                bool v6, struct device_route **route)
 209 {
 210         __find_ip_route_target(&iface->proto_ip, a, v6, route);
 211         __find_ip_route_target(&iface->config_ip, a, v6, route);
 212 }
 213
 214 struct interface *
 215 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
 216 {
 217         struct device_route *route, *r_next = NULL;
 218         bool defaultroute_target = false;
 219         int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
 220
 221         route = calloc(1, sizeof(*route));
 222         if (!route)
 223                 return NULL;
 224
 225         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 226         route->mask = v6 ? 128 : 32;
 227         if (memcmp(&route->addr, addr, addrsize) == 0)
 228                 defaultroute_target = true;
 229         else
 230                 memcpy(&route->addr, addr, addrsize);
 231
 232         if (iface) {
 233                 /* look for locally addressable target first */
 234                 if (interface_ip_find_addr_target(iface, addr, v6))
 235                         goto done;
 236
 237                 /* do not stop at the first route, let the lookup compare
 238                  * masks to find the best match */
 239                 interface_ip_find_route_target(iface, addr, v6, &r_next);
 240         } else {
 241                 vlist_for_each_element(&interfaces, iface, node) {
 242                         /* look for locally addressable target first */
 243                         if (interface_ip_find_addr_target(iface, addr, v6))
 244                                 goto done;
 245
 246                         /* do not stop at the first route, let the lookup compare
 247                          * masks to find the best match */
 248                         interface_ip_find_route_target(iface, addr, v6, &r_next);
 249                 }
 250         }
 251
 252         if (!r_next) {
 253                 free(route);
 254                 return NULL;
 255         }
 256
 257         iface = r_next->iface;
 258         memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
 259         route->mtu = r_next->mtu;
 260         route->metric = r_next->metric;
 261         route->table = r_next->table;
 262
 263 done:
 264         route->iface = iface;
 265         if (defaultroute_target)
 266                 free(route);
 267         else
 268                 vlist_add(&iface->host_routes, &route->node, route);
 269         return iface;
 270 }
 271
 272 void
 273 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
 274 {
 275         struct interface_ip_settings *ip;
 276         struct blob_attr *tb[__ROUTE_MAX], *cur;
 277         struct device_route *route;
 278         int af = v6 ? AF_INET6 : AF_INET;
 279         bool is_proto_route = !!iface;
 280
 281         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 282
 283         if (!iface) {
 284                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
 285                         return;
 286
 287                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 288                 if (!iface)
 289                         return;
 290
 291                 ip = &iface->config_ip;
 292         } else {
 293                 ip = &iface->proto_ip;
 294         }
 295
 296         route = calloc(1, sizeof(*route));
 297         if (!route)
 298                 return;
 299
 300         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 301         route->mask = v6 ? 128 : 32;
 302         if ((cur = tb[ROUTE_MASK]) != NULL) {
 303                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
 304                 if (route->mask > (v6 ? 128 : 32))
 305                         goto error;
 306         }
 307
 308         if ((cur = tb[ROUTE_TARGET]) != NULL) {
 309                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
 310                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
 311                         goto error;
 312                 }
 313         }
 314
 315         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
 316                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
 317                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
 318                         goto error;
 319                 }
 320         }
 321
 322         if ((cur = tb[ROUTE_METRIC]) != NULL) {
 323                 route->metric = blobmsg_get_u32(cur);
 324                 route->flags |= DEVROUTE_METRIC;
 325         } else
 326                 route->metric = iface->metric;
 327
 328         if ((cur = tb[ROUTE_MTU]) != NULL) {
 329                 route->mtu = blobmsg_get_u32(cur);
 330                 route->flags |= DEVROUTE_MTU;
 331         }
 332
 333         // Use source-based routing
 334         if ((cur = tb[ROUTE_SOURCE]) != NULL) {
 335                 char *saveptr, *source = alloca(blobmsg_data_len(cur));
 336                 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
 337
 338                 const char *addr = strtok_r(source, "/", &saveptr);
 339                 const char *mask = strtok_r(NULL, "/", &saveptr);
 340
 341                 if (!addr || inet_pton(af, addr, &route->source) < 1) {
 342                         DPRINTF("Failed to parse route source: %s\n", addr);
 343                         goto error;
 344                 }
 345
 346                 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
 347         }
 348
 349         if (is_proto_route) {
 350                 route->table = (v6) ? iface->ip6table : iface->ip4table;
 351                 route->flags |= DEVROUTE_SRCTABLE;
 352         }
 353
 354         if ((cur = tb[ROUTE_TABLE]) != NULL) {
 355                 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
 356                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 357                         goto error;
 358                 }
 359
 360                 if (route->table)
 361                         route->flags |= DEVROUTE_TABLE;
 362         }
 363
 364         if ((cur = tb[ROUTE_VALID]) != NULL) {
 365                 int64_t valid = blobmsg_get_u32(cur);
 366                 int64_t valid_until = valid + (int64_t)system_get_rtime();
 367                 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
 368                         route->valid_until = valid_until;
 369         }
 370
 371         vlist_add(&ip->route, &route->node, route);
 372         return;
 373
 374 error:
 375         free(route);
 376 }
 377
 378 static int
 379 addr_cmp(const void *k1, const void *k2, void *ptr)
 380 {
 381         return memcmp(k1, k2, sizeof(struct device_addr) -
 382                       offsetof(struct device_addr, flags));
 383 }
 384
 385 static int
 386 route_cmp(const void *k1, const void *k2, void *ptr)
 387 {
 388         const struct device_route *r1 = k1, *r2 = k2;
 389
 390         if (r1->mask != r2->mask)
 391                 return r2->mask - r1->mask;
 392
 393         if (r1->metric != r2->metric)
 394                 return r1->metric - r2->metric;
 395
 396         if (r1->flags != r2->flags)
 397                 return r2->flags - r1->flags;
 398
 399         if (r1->sourcemask != r2->sourcemask)
 400                 return r1->sourcemask - r2->sourcemask;
 401
 402         int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
 403         if (maskcmp)
 404                 return maskcmp;
 405
 406         return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
 407 }
 408
 409 static int
 410 prefix_cmp(const void *k1, const void *k2, void *ptr)
 411 {
 412         return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
 413                         offsetof(struct device_prefix, addr));
 414 }
 415
 416 static void
 417 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
 418 {
 419         struct device *dev = iface->l3_dev.dev;
 420         struct device_route route;
 421
 422         memset(&route, 0, sizeof(route));
 423         route.iface = iface;
 424         route.flags = addr->flags;
 425         route.mask = addr->mask;
 426         memcpy(&route.addr, &addr->addr, sizeof(route.addr));
 427         clear_if_addr(&route.addr, route.mask);
 428
 429         if (add) {
 430                 route.flags |= DEVADDR_KERNEL;
 431                 system_del_route(dev, &route);
 432
 433                 if (!(addr->flags & DEVADDR_OFFLINK)) {
 434                         route.flags &= ~DEVADDR_KERNEL;
 435                         route.metric = iface->metric;
 436                         system_add_route(dev, &route);
 437                 }
 438         } else {
 439                 if (!(addr->flags & DEVADDR_OFFLINK))
 440                         system_del_route(dev, &route);
 441         }
 442 }
 443
 444 static void
 445 interface_update_proto_addr(struct vlist_tree *tree,
 446                             struct vlist_node *node_new,
 447                             struct vlist_node *node_old)
 448 {
 449         struct interface_ip_settings *ip;
 450         struct interface *iface;
 451         struct device *dev;
 452         struct device_addr *a_new = NULL, *a_old = NULL;
 453         bool replace = false;
 454         bool keep = false;
 455         bool v6 = false;
 456
 457         ip = container_of(tree, struct interface_ip_settings, addr);
 458         iface = ip->iface;
 459         dev = iface->l3_dev.dev;
 460
 461         if (!node_new || !node_old)
 462                 iface->updated |= IUF_ADDRESS;
 463
 464         if (node_new) {
 465                 a_new = container_of(node_new, struct device_addr, node);
 466
 467                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 468                     !a_new->broadcast) {
 469
 470                         uint32_t mask = ~0;
 471                         uint32_t *a = (uint32_t *) &a_new->addr;
 472
 473                         mask >>= a_new->mask;
 474                         a_new->broadcast = *a | htonl(mask);
 475                 }
 476         }
 477
 478         if (node_old)
 479                 a_old = container_of(node_old, struct device_addr, node);
 480
 481         if (a_new && a_old) {
 482                 keep = true;
 483
 484                 if (a_old->flags != a_new->flags || a_old->failed)
 485                         keep = false;
 486
 487                 if (a_old->valid_until != a_new->valid_until ||
 488                                 a_old->preferred_until != a_new->preferred_until)
 489                         replace = true;
 490
 491                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 492                     a_new->broadcast != a_old->broadcast)
 493                         keep = false;
 494         }
 495
 496         if (node_old) {
 497                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep) {
 498                         interface_handle_subnet_route(iface, a_old, false);
 499
 500                         if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 501                                 v6 = true;
 502
 503                         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 504
 505                         //This is needed for source routing to work correctly. If a device
 506                         //has two connections to a network using the same subnet, adding
 507                         //only the network-rule will cause packets to be routed through the
 508                         //first matching network (source IP matches both masks).
 509                         if (table) {
 510                                 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
 511                                                 (v6) ? 128 : 32, table, NULL, NULL);
 512                                 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
 513                                                 a_old->mask, table, NULL, NULL);
 514                         }
 515
 516                         system_del_address(dev, a_old);
 517                 }
 518                 free(a_old->pclass);
 519                 free(a_old);
 520         }
 521
 522         if (node_new) {
 523                 a_new->enabled = true;
 524                 if (!(a_new->flags & DEVADDR_EXTERNAL) && (!keep || replace)) {
 525                         if (system_add_address(dev, a_new))
 526                                 a_new->failed = true;
 527
 528                         if (!keep) {
 529                                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
 530                                         v6 = true;
 531
 532                                 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 533
 534                                 if (table) {
 535                                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
 536                                                         (v6) ? 128 : 32, table, NULL, NULL);
 537                                         set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
 538                                                         a_new->mask, table, NULL, NULL);
 539                                 }
 540                         }
 541
 542                         if ((a_new->flags & DEVADDR_OFFLINK) || iface->metric)
 543                                 interface_handle_subnet_route(iface, a_new, true);
 544                 }
 545         }
 546 }
 547
 548 static bool
 549 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 550 {
 551         if (ip->no_defaultroute && !route->mask)
 552                 return false;
 553
 554         return ip->enabled;
 555 }
 556
 557 static void
 558 interface_update_proto_route(struct vlist_tree *tree,
 559                              struct vlist_node *node_new,
 560                              struct vlist_node *node_old)
 561 {
 562         struct interface_ip_settings *ip;
 563         struct interface *iface;
 564         struct device *dev;
 565         struct device_route *route_old, *route_new;
 566         bool keep = false;
 567
 568         ip = container_of(tree, struct interface_ip_settings, route);
 569         iface = ip->iface;
 570         dev = iface->l3_dev.dev;
 571
 572         if (!node_new || !node_old)
 573                 iface->updated |= IUF_ROUTE;
 574
 575         route_old = container_of(node_old, struct device_route, node);
 576         route_new = container_of(node_new, struct device_route, node);
 577
 578         if (node_old && node_new)
 579                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
 580                         (route_old->table == route_new->table) && !route_old->failed;
 581
 582         if (node_old) {
 583                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 584                         system_del_route(dev, route_old);
 585
 586                 free(route_old);
 587         }
 588
 589         if (node_new) {
 590                 bool _enabled = enable_route(ip, route_new);
 591
 592                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 593                         if (system_add_route(dev, route_new))
 594                                 route_new->failed = true;
 595
 596                 route_new->iface = iface;
 597                 route_new->enabled = _enabled;
 598         }
 599 }
 600
 601 static void
 602 interface_update_host_route(struct vlist_tree *tree,
 603                              struct vlist_node *node_new,
 604                              struct vlist_node *node_old)
 605 {
 606         struct interface *iface;
 607         struct device *dev;
 608         struct device_route *route_old, *route_new;
 609
 610         iface = container_of(tree, struct interface, host_routes);
 611         dev = iface->l3_dev.dev;
 612
 613         route_old = container_of(node_old, struct device_route, node);
 614         route_new = container_of(node_new, struct device_route, node);
 615
 616         if (node_old) {
 617                 system_del_route(dev, route_old);
 618                 free(route_old);
 619         }
 620
 621         if (node_new)
 622                 system_add_route(dev, route_new);
 623 }
 624
 625
 626 static void
 627 interface_set_prefix_address(struct device_prefix_assignment *assignment,
 628                 const struct device_prefix *prefix, struct interface *iface, bool add)
 629 {
 630         const struct interface *uplink = prefix->iface;
 631         if (!iface->l3_dev.dev)
 632                 return;
 633
 634         struct device *l3_downlink = iface->l3_dev.dev;
 635
 636         struct device_addr addr;
 637         memset(&addr, 0, sizeof(addr));
 638         addr.addr.in6 = prefix->addr;
 639         addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
 640         addr.addr.in6.s6_addr[15] += 1;
 641         addr.mask = assignment->length;
 642         addr.flags = DEVADDR_INET6;
 643         addr.preferred_until = prefix->preferred_until;
 644         addr.valid_until = prefix->valid_until;
 645
 646         if (!add && assignment->enabled) {
 647                 time_t now = system_get_rtime();
 648                 addr.preferred_until = now;
 649                 if (!addr.valid_until || addr.valid_until - now > 7200)
 650                         addr.valid_until = now + 7200;
 651                 system_del_address(l3_downlink, &addr); // Work around dangling prefix routes
 652                 system_add_address(l3_downlink, &addr);
 653                 if (prefix->iface) {
 654                         if (prefix->iface->ip6table)
 655                                 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
 656                                                 addr.mask, prefix->iface->ip6table, iface, NULL);
 657
 658                         set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 659                                                         addr.mask, 0, iface, "unreachable");
 660                 }
 661
 662                 assignment->enabled = false;
 663         } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP)) {
 664                 system_add_address(l3_downlink, &addr);
 665                 if (prefix->iface && !assignment->enabled) {
 666                         set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
 667                                         addr.mask, 0, iface, "unreachable");
 668
 669                         if (prefix->iface->ip6table)
 670                                 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
 671                                                 addr.mask, prefix->iface->ip6table, iface, NULL);
 672                 }
 673                 if (uplink && uplink->l3_dev.dev) {
 674                         int mtu = system_update_ipv6_mtu(
 675                                         uplink->l3_dev.dev, 0);
 676                         if (mtu > 0)
 677                                 system_update_ipv6_mtu(l3_downlink, mtu);
 678                 }
 679                 assignment->enabled = true;
 680         }
 681 }
 682
 683 static bool interface_prefix_assign(struct list_head *list,
 684                 struct device_prefix_assignment *assign)
 685 {
 686         int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
 687         struct device_prefix_assignment *c;
 688         list_for_each_entry(c, list, head) {
 689                 if (assign->assigned != -1) {
 690                         if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
 691                                 list_add_tail(&assign->head, &c->head);
 692                                 return true;
 693                         }
 694                 } else if (assign->assigned == -1) {
 695                         current = (current + asize) & (~asize);
 696                         if (current + asize < c->assigned) {
 697                                 assign->assigned = current;
 698                                 list_add_tail(&assign->head, &c->head);
 699                                 return true;
 700                         }
 701                 }
 702                 current = (c->assigned + (1 << (64 - c->length)));
 703         }
 704         return false;
 705 }
 706
 707 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
 708 {
 709         struct device_prefix_assignment *c;
 710         struct interface *iface;
 711
 712         // Delete all assignments
 713         while (!list_empty(&prefix->assignments)) {
 714                 c = list_first_entry(&prefix->assignments,
 715                                 struct device_prefix_assignment, head);
 716                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 717                         interface_set_prefix_address(c, prefix, iface, false);
 718                 list_del(&c->head);
 719                 free(c);
 720         }
 721
 722         if (!setup)
 723                 return;
 724
 725         // End-of-assignment sentinel
 726         c = malloc(sizeof(*c) + 1);
 727         c->assigned = 1 << (64 - prefix->length);
 728         c->length = 64;
 729         c->name[0] = 0;
 730         list_add(&c->head, &prefix->assignments);
 731
 732         // Excluded prefix
 733         if (prefix->excl_length > 0) {
 734                 const char name[] = "!excluded";
 735                 c = malloc(sizeof(*c) + sizeof(name));
 736                 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
 737                                 ((1 << (64 - prefix->length)) - 1);
 738                 c->length = prefix->excl_length;
 739                 memcpy(c->name, name, sizeof(name));
 740                 list_add(&c->head, &prefix->assignments);
 741         }
 742
 743         bool assigned_any = false;
 744         struct list_head assign_later = LIST_HEAD_INIT(assign_later);
 745         vlist_for_each_element(&interfaces, iface, node) {
 746                 if (iface->assignment_length < 48 ||
 747                                 iface->assignment_length > 64)
 748                         continue;
 749
 750                 // Test whether there is a matching class
 751                 if (!list_empty(&iface->assignment_classes)) {
 752                         bool found = false;
 753
 754                         struct interface_assignment_class *c;
 755                         list_for_each_entry(c, &iface->assignment_classes, head) {
 756                                 if (!strcmp(c->name, prefix->pclass)) {
 757                                         found = true;
 758                                         break;
 759                                 }
 760                         }
 761
 762                         if (!found)
 763                                 continue;
 764                 }
 765
 766                 size_t namelen = strlen(iface->name) + 1;
 767                 c = malloc(sizeof(*c) + namelen);
 768                 c->length = iface->assignment_length;
 769                 c->assigned = iface->assignment_hint;
 770                 c->enabled = false;
 771                 memcpy(c->name, iface->name, namelen);
 772
 773                 // First process all custom assignments, put all others in later-list
 774                 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
 775                         if (c->assigned != -1) {
 776                                 c->assigned = -1;
 777                                 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
 778                                                 "of size %hhu for %s, trying other\n", c->length, c->name);
 779                         }
 780
 781                         struct list_head *next = &assign_later;
 782                         struct device_prefix_assignment *n;
 783                         list_for_each_entry(n, &assign_later, head) {
 784                                 if (n->length < c->length) {
 785                                         next = &n->head;
 786                                         break;
 787                                 }
 788                         }
 789                         list_add_tail(&c->head, next);
 790                 }
 791
 792                 if (c->assigned != -1)
 793                         assigned_any = true;
 794         }
 795
 796         // Then try to assign all other + failed custom assignments
 797         while (!list_empty(&assign_later)) {
 798                 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
 799                 list_del(&c->head);
 800
 801                 bool assigned = false;
 802                 do {
 803                         assigned = interface_prefix_assign(&prefix->assignments, c);
 804                 } while (!assigned && ++c->length <= 64);
 805
 806                 if (!assigned) {
 807                         netifd_log_message(L_WARNING, "Failed to assign subprefix "
 808                                         "of size %hhu for %s\n", c->length, c->name);
 809                         free(c);
 810                 } else {
 811                         assigned_any = true;
 812                 }
 813         }
 814
 815         list_for_each_entry(c, &prefix->assignments, head)
 816                 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 817                         interface_set_prefix_address(c, prefix, iface, true);
 818
 819         if (!assigned_any)
 820                 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
 821                                 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
 822 }
 823
 824
 825 void interface_refresh_assignments(bool hint)
 826 {
 827         static bool refresh = false;
 828         if (!hint && refresh) {
 829                 struct device_prefix *p;
 830                 list_for_each_entry(p, &prefixes, head)
 831                         interface_update_prefix_assignments(p, true);
 832         }
 833         refresh = hint;
 834 }
 835
 836
 837 static void
 838 interface_update_prefix(struct vlist_tree *tree,
 839                              struct vlist_node *node_new,
 840                              struct vlist_node *node_old)
 841 {
 842         struct device_prefix *prefix_old, *prefix_new;
 843         prefix_old = container_of(node_old, struct device_prefix, node);
 844         prefix_new = container_of(node_new, struct device_prefix, node);
 845
 846         struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
 847         if (tree && (!node_new || !node_old))
 848                 ip->iface->updated |= IUF_PREFIX;
 849
 850         struct device_route route;
 851         memset(&route, 0, sizeof(route));
 852         route.flags = DEVADDR_INET6;
 853         route.metric = INT32_MAX;
 854         route.mask = (node_new) ? prefix_new->length : prefix_old->length;
 855         route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
 856
 857
 858         struct device_prefix_assignment *c;
 859         struct interface *iface;
 860
 861         if (node_old && node_new) {
 862                 // Move assignments and refresh addresses to update valid times
 863                 list_splice(&prefix_old->assignments, &prefix_new->assignments);
 864
 865                 list_for_each_entry(c, &prefix_new->assignments, head)
 866                         if ((iface = vlist_find(&interfaces, c->name, iface, node)))
 867                                 interface_set_prefix_address(c, prefix_new, iface, true);
 868         } else if (node_new) {
 869                 // Set null-route to avoid routing loops
 870                 system_add_route(NULL, &route);
 871
 872                 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
 873                         interface_update_prefix_assignments(prefix_new, true);
 874         } else if (node_old) {
 875                 // Remove null-route
 876                 interface_update_prefix_assignments(prefix_old, false);
 877                 system_del_route(NULL, &route);
 878         }
 879
 880         if (node_old) {
 881                 if (prefix_old->head.next)
 882                         list_del(&prefix_old->head);
 883                 free(prefix_old);
 884         }
 885
 886         if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
 887                 list_add(&prefix_new->head, &prefixes);
 888
 889 }
 890
 891 struct device_prefix*
 892 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
 893                 uint8_t length, time_t valid_until, time_t preferred_until,
 894                 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
 895 {
 896         if (!pclass)
 897                 pclass = (iface) ? iface->name : "local";
 898
 899         struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
 900         prefix->length = length;
 901         prefix->addr = *addr;
 902         prefix->preferred_until = preferred_until;
 903         prefix->valid_until = valid_until;
 904         prefix->iface = iface;
 905         INIT_LIST_HEAD(&prefix->assignments);
 906
 907         if (excl_addr) {
 908                 prefix->excl_addr = *excl_addr;
 909                 prefix->excl_length = excl_length;
 910         }
 911
 912         strcpy(prefix->pclass, pclass);
 913
 914         if (iface)
 915                 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
 916         else
 917                 interface_update_prefix(NULL, &prefix->node, NULL);
 918
 919         return prefix;
 920 }
 921
 922 void
 923 interface_ip_set_ula_prefix(const char *prefix)
 924 {
 925         char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
 926         if (prefix)
 927                 strncpy(buf, prefix, sizeof(buf) - 1);
 928         char *prefixaddr = strtok_r(buf, "/", &saveptr);
 929
 930         struct in6_addr addr;
 931         if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
 932                 if (ula_prefix) {
 933                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 934                         ula_prefix = NULL;
 935                 }
 936                 return;
 937         }
 938
 939         int length;
 940         char *prefixlen = strtok_r(NULL, ",", &saveptr);
 941         if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
 942                 return;
 943
 944         if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
 945                         ula_prefix->length != length) {
 946                 if (ula_prefix)
 947                         interface_update_prefix(NULL, NULL, &ula_prefix->node);
 948
 949                 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
 950                                 0, 0, NULL, 0, NULL);
 951         }
 952 }
 953
 954 void
 955 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 956 {
 957         struct dns_server *s;
 958
 959         s = calloc(1, sizeof(*s));
 960         if (!s)
 961                 return;
 962
 963         s->af = AF_INET;
 964         if (inet_pton(s->af, str, &s->addr.in))
 965                 goto add;
 966
 967         s->af = AF_INET6;
 968         if (inet_pton(s->af, str, &s->addr.in))
 969                 goto add;
 970
 971         free(s);
 972         return;
 973
 974 add:
 975         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 976           s->af == AF_INET6 ? '6' : '4', str);
 977         vlist_simple_add(&ip->dns_servers, &s->node);
 978 }
 979
 980 void
 981 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 982 {
 983         struct blob_attr *cur;
 984         int rem;
 985
 986         blobmsg_for_each_attr(cur, list, rem) {
 987                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 988                         continue;
 989
 990                 if (!blobmsg_check_attr(cur, NULL))
 991                         continue;
 992
 993                 interface_add_dns_server(ip, blobmsg_data(cur));
 994         }
 995 }
 996
 997 static void
 998 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 999 {
1000         struct dns_search_domain *s;
1001         int len = strlen(str);
1002
1003         s = calloc(1, sizeof(*s) + len + 1);
1004         if (!s)
1005                 return;
1006
1007         D(INTERFACE, "Add DNS search domain: %s\n", str);
1008         memcpy(s->name, str, len);
1009         vlist_simple_add(&ip->dns_search, &s->node);
1010 }
1011
1012 void
1013 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1014 {
1015         struct blob_attr *cur;
1016         int rem;
1017
1018         blobmsg_for_each_attr(cur, list, rem) {
1019                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1020                         continue;
1021
1022                 if (!blobmsg_check_attr(cur, NULL))
1023                         continue;
1024
1025                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1026         }
1027 }
1028
1029 static void
1030 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
1031 {
1032         struct dns_server *s;
1033         struct dns_search_domain *d;
1034         const char *str;
1035         char buf[INET6_ADDRSTRLEN];
1036
1037         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1038                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1039                 if (!str)
1040                         continue;
1041
1042                 fprintf(f, "nameserver %s\n", str);
1043         }
1044
1045         vlist_simple_for_each_element(&ip->dns_search, d, node) {
1046                 fprintf(f, "search %s\n", d->name);
1047         }
1048 }
1049
1050 void
1051 interface_write_resolv_conf(void)
1052 {
1053         struct interface *iface;
1054         char *path = alloca(strlen(resolv_conf) + 5);
1055         FILE *f;
1056         uint32_t crcold, crcnew;
1057
1058         sprintf(path, "%s.tmp", resolv_conf);
1059         unlink(path);
1060         f = fopen(path, "w+");
1061         if (!f) {
1062                 D(INTERFACE, "Failed to open %s for writing\n", path);
1063                 return;
1064         }
1065
1066         vlist_for_each_element(&interfaces, iface, node) {
1067                 if (iface->state != IFS_UP)
1068                         continue;
1069
1070                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1071                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1072                         vlist_simple_empty(&iface->config_ip.dns_search) &&
1073                     vlist_simple_empty(&iface->config_ip.dns_servers))
1074                         continue;
1075
1076                 fprintf(f, "# Interface %s\n", iface->name);
1077                 write_resolv_conf_entries(f, &iface->config_ip);
1078                 if (!iface->proto_ip.no_dns)
1079                         write_resolv_conf_entries(f, &iface->proto_ip);
1080         }
1081         fflush(f);
1082         rewind(f);
1083         crcnew = crc32_file(f);
1084         fclose(f);
1085
1086         crcold = crcnew + 1;
1087         f = fopen(resolv_conf, "r");
1088         if (f) {
1089                 crcold = crc32_file(f);
1090                 fclose(f);
1091         }
1092
1093         if (crcold == crcnew) {
1094                 unlink(path);
1095         } else if (rename(path, resolv_conf) < 0) {
1096                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1097                 unlink(path);
1098         }
1099 }
1100
1101 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1102 {
1103         struct device_addr *addr;
1104         struct device_route *route;
1105         struct device *dev;
1106
1107         ip->enabled = enabled;
1108         dev = ip->iface->l3_dev.dev;
1109         if (!dev)
1110                 return;
1111
1112         vlist_for_each_element(&ip->addr, addr, node) {
1113                 if (addr->enabled == enabled)
1114                         continue;
1115
1116                 if (enabled)
1117                         system_add_address(dev, addr);
1118                 else
1119                         system_del_address(dev, addr);
1120                 addr->enabled = enabled;
1121         }
1122
1123         vlist_for_each_element(&ip->route, route, node) {
1124                 bool _enabled = enabled;
1125
1126                 if (!enable_route(ip, route))
1127                         _enabled = false;
1128
1129                 if (route->enabled == _enabled)
1130                         continue;
1131
1132                 if (_enabled) {
1133                         if (!(route->flags & DEVROUTE_METRIC))
1134                                 route->metric = ip->iface->metric;
1135
1136                         system_add_route(dev, route);
1137                 } else
1138                         system_del_route(dev, route);
1139                 route->enabled = _enabled;
1140         }
1141
1142         struct device_prefix *c;
1143         struct device_prefix_assignment *a;
1144         list_for_each_entry(c, &prefixes, head)
1145                 list_for_each_entry(a, &c->assignments, head)
1146                         if (!strcmp(a->name, ip->iface->name))
1147                                 interface_set_prefix_address(a, c, ip->iface, enabled);
1148
1149         if (ip->iface && ip->iface->l3_dev.dev) {
1150                 set_ip_lo_policy(enabled, true, ip->iface);
1151                 set_ip_lo_policy(enabled, false, ip->iface);
1152
1153                 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1154                         NULL, 0, 0, ip->iface, "failed_policy");
1155         }
1156 }
1157
1158 void
1159 interface_ip_update_start(struct interface_ip_settings *ip)
1160 {
1161         if (ip != &ip->iface->config_ip) {
1162                 vlist_simple_update(&ip->dns_servers);
1163                 vlist_simple_update(&ip->dns_search);
1164         }
1165         vlist_update(&ip->route);
1166         vlist_update(&ip->addr);
1167         vlist_update(&ip->prefix);
1168 }
1169
1170 void
1171 interface_ip_update_complete(struct interface_ip_settings *ip)
1172 {
1173         vlist_simple_flush(&ip->dns_servers);
1174         vlist_simple_flush(&ip->dns_search);
1175         vlist_flush(&ip->route);
1176         vlist_flush(&ip->addr);
1177         vlist_flush(&ip->prefix);
1178         interface_write_resolv_conf();
1179 }
1180
1181 void
1182 interface_ip_flush(struct interface_ip_settings *ip)
1183 {
1184         if (ip == &ip->iface->proto_ip)
1185                 vlist_flush_all(&ip->iface->host_routes);
1186         vlist_simple_flush_all(&ip->dns_servers);
1187         vlist_simple_flush_all(&ip->dns_search);
1188         vlist_flush_all(&ip->route);
1189         vlist_flush_all(&ip->addr);
1190         vlist_flush_all(&ip->prefix);
1191 }
1192
1193 static void
1194 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1195 {
1196         ip->iface = iface;
1197         ip->enabled = true;
1198         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1199         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1200         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1201         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1202         vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1203 }
1204
1205 void
1206 interface_ip_init(struct interface *iface)
1207 {
1208         __interface_ip_init(&iface->proto_ip, iface);
1209         __interface_ip_init(&iface->config_ip, iface);
1210         vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1211
1212 }
1213
1214 static void
1215 interface_ip_valid_until_handler(struct uloop_timeout *t)
1216 {
1217         time_t now = system_get_rtime();
1218         struct interface *iface;
1219         vlist_for_each_element(&interfaces, iface, node) {
1220                 if (iface->state != IFS_UP)
1221                         continue;
1222
1223                 struct device_addr *addr, *addrp;
1224                 struct device_route *route, *routep;
1225                 struct device_prefix *pref, *prefp;
1226
1227                 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1228                         if (addr->valid_until && addr->valid_until < now)
1229                                 vlist_delete(&iface->proto_ip.addr, &addr->node);
1230
1231                 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1232                         if (route->valid_until && route->valid_until < now)
1233                                 vlist_delete(&iface->proto_ip.route, &route->node);
1234
1235                 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1236                         if (pref->valid_until && pref->valid_until < now)
1237                                 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1238
1239         }
1240
1241         uloop_timeout_set(t, 1000);
1242 }
1243
1244 static void __init
1245 interface_ip_init_worker(void)
1246 {
1247         valid_until_timeout.cb = interface_ip_valid_until_handler;
1248         uloop_timeout_set(&valid_until_timeout, 1000);
1249 }