interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29 static unsigned int interface_serial = 0;
  30
  31 enum {
  32         IFACE_ATTR_IFNAME,
  33         IFACE_ATTR_PROTO,
  34         IFACE_ATTR_AUTO,
  35         IFACE_ATTR_DEFAULTROUTE,
  36         IFACE_ATTR_PEERDNS,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DNS_SEARCH,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_MAX
  46 };
  47
  48 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  49         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  50         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  52         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  55         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  56         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  58         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  59         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  62 };
  63
  64 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  65         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  66 };
  67
  68 const struct config_param_list interface_attr_list = {
  69         .n_params = IFACE_ATTR_MAX,
  70         .params = iface_attrs,
  71         .info = iface_attr_info,
  72 };
  73
  74 static void
  75 interface_clear_errors(struct interface *iface)
  76 {
  77         struct interface_error *error, *tmp;
  78
  79         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  80                 list_del(&error->list);
  81                 free(error);
  82         }
  83 }
  84
  85 void interface_add_error(struct interface *iface, const char *subsystem,
  86                          const char *code, const char **data, int n_data)
  87 {
  88         struct interface_error *error;
  89         int i, len = 0;
  90         int *datalen = NULL;
  91         char *dest, *d_subsys, *d_code;
  92
  93         if (n_data) {
  94                 len = n_data * sizeof(char *);
  95                 datalen = alloca(len);
  96                 for (i = 0; i < n_data; i++) {
  97                         datalen[i] = strlen(data[i]) + 1;
  98                         len += datalen[i];
  99                 }
 100         }
 101
 102         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 103                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 104                 &d_code, code ? strlen(code) + 1 : 0);
 105         if (!error)
 106                 return;
 107
 108         list_add_tail(&error->list, &iface->errors);
 109
 110         dest = (char *) &error->data[n_data + 1];
 111         for (i = 0; i < n_data; i++) {
 112                 error->data[i] = dest;
 113                 memcpy(dest, data[i], datalen[i]);
 114                 dest += datalen[i];
 115         }
 116         error->data[n_data++] = NULL;
 117
 118         if (subsystem)
 119                 error->subsystem = strcpy(d_subsys, subsystem);
 120
 121         if (code)
 122                 error->code = strcpy(d_code, code);
 123 }
 124
 125 static void
 126 interface_data_del(struct interface *iface, struct interface_data *data)
 127 {
 128         avl_delete(&iface->data, &data->node);
 129         free(data);
 130 }
 131
 132 static void
 133 interface_data_flush(struct interface *iface)
 134 {
 135         struct interface_data *d, *tmp;
 136
 137         avl_for_each_element_safe(&iface->data, d, node, tmp)
 138                 interface_data_del(iface, d);
 139 }
 140
 141 int
 142 interface_add_data(struct interface *iface, const struct blob_attr *data)
 143 {
 144         struct interface_data *n, *o;
 145
 146         if (!blobmsg_check_attr(data, true))
 147                 return UBUS_STATUS_INVALID_ARGUMENT;
 148
 149         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 150         memcpy(n->data, data, blob_pad_len(data));
 151         n->node.key = blobmsg_name(data);
 152
 153         o = avl_find_element(&iface->data, n->node.key, o, node);
 154         if (o)
 155                 interface_data_del(iface, o);
 156
 157         avl_insert(&iface->data, &n->node);
 158         return 0;
 159 }
 160
 161 static void
 162 interface_event(struct interface *iface, enum interface_event ev)
 163 {
 164         struct interface_user *dep, *tmp;
 165         struct device *adev = NULL;
 166
 167         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 168                 dep->cb(dep, iface, ev);
 169
 170         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 171                 dep->cb(dep, iface, ev);
 172
 173         switch (ev) {
 174         case IFEV_UP:
 175                 adev = iface->l3_dev.dev;
 176                 /* fall through */
 177         case IFEV_DOWN:
 178                 alias_notify_device(iface->name, adev);
 179                 break;
 180         default:
 181                 break;
 182         }
 183 }
 184
 185 static void
 186 interface_flush_state(struct interface *iface)
 187 {
 188         if (iface->l3_dev.dev)
 189                 device_release(&iface->l3_dev);
 190         interface_data_flush(iface);
 191 }
 192
 193 static void
 194 mark_interface_down(struct interface *iface)
 195 {
 196         enum interface_state state = iface->state;
 197
 198         iface->state = IFS_DOWN;
 199         if (state == IFS_UP)
 200                 interface_event(iface, IFEV_DOWN);
 201         interface_ip_set_enabled(&iface->config_ip, false);
 202         interface_ip_flush(&iface->proto_ip);
 203         interface_flush_state(iface);
 204         system_flush_routes();
 205 }
 206
 207 void
 208 __interface_set_down(struct interface *iface, bool force)
 209 {
 210         if (iface->state == IFS_DOWN ||
 211                 iface->state == IFS_TEARDOWN)
 212                 return;
 213
 214         if (iface->state == IFS_UP)
 215                 interface_event(iface, IFEV_DOWN);
 216         iface->state = IFS_TEARDOWN;
 217         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 218         if (force)
 219                 interface_flush_state(iface);
 220 }
 221
 222 static void
 223 interface_cb(struct device_user *dep, enum device_event ev)
 224 {
 225         struct interface *iface;
 226         bool new_state;
 227
 228         iface = container_of(dep, struct interface, main_dev);
 229         switch (ev) {
 230         case DEV_EVENT_ADD:
 231                 new_state = true;
 232                 break;
 233         case DEV_EVENT_REMOVE:
 234                 new_state = false;
 235                 break;
 236         default:
 237                 return;
 238         }
 239
 240         interface_set_available(iface, new_state);
 241         if (!new_state && dep->dev->external)
 242                 interface_set_main_dev(iface, NULL);
 243 }
 244
 245 void
 246 interface_set_available(struct interface *iface, bool new_state)
 247 {
 248         if (iface->available == new_state)
 249                 return;
 250
 251         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 252         iface->available = new_state;
 253
 254         if (new_state) {
 255                 if (iface->autostart && !config_init)
 256                         interface_set_up(iface);
 257         } else
 258                 __interface_set_down(iface, true);
 259 }
 260
 261 void
 262 interface_add_user(struct interface_user *dep, struct interface *iface)
 263 {
 264         if (!iface) {
 265                 list_add(&dep->list, &iface_all_users);
 266                 return;
 267         }
 268
 269         dep->iface = iface;
 270         list_add(&dep->list, &iface->users);
 271         if (iface->state == IFS_UP)
 272                 dep->cb(dep, iface, IFEV_UP);
 273 }
 274
 275 void
 276 interface_remove_user(struct interface_user *dep)
 277 {
 278         list_del_init(&dep->list);
 279         dep->iface = NULL;
 280 }
 281
 282 static void
 283 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 284 {
 285         struct interface *alias = container_of(dep, struct interface, parent_iface);
 286         struct device *dev = iface->l3_dev.dev;
 287
 288         switch (ev) {
 289         case IFEV_UP:
 290                 if (!dev)
 291                         return;
 292
 293                 interface_set_main_dev(alias, dev);
 294                 interface_set_available(alias, true);
 295                 break;
 296         case IFEV_DOWN:
 297                 interface_set_available(alias, false);
 298                 interface_set_main_dev(alias, NULL);
 299                 break;
 300         case IFEV_FREE:
 301                 interface_remove_user(dep);
 302                 break;
 303         case IFEV_RELOAD:
 304                 break;
 305         }
 306 }
 307
 308 static void
 309 interface_claim_device(struct interface *iface)
 310 {
 311         struct interface *parent;
 312         struct device *dev = NULL;
 313
 314         if (iface->parent_iface.iface)
 315                 interface_remove_user(&iface->parent_iface);
 316
 317         if (iface->parent_ifname) {
 318                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 319                 iface->parent_iface.cb = interface_alias_cb;
 320                 interface_add_user(&iface->parent_iface, parent);
 321         } else if (iface->ifname &&
 322                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 323                 dev = device_get(iface->ifname, true);
 324         }
 325
 326         if (dev)
 327                 interface_set_main_dev(iface, dev);
 328
 329         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 330                 interface_set_available(iface, true);
 331 }
 332
 333 static void
 334 interface_cleanup_state(struct interface *iface)
 335 {
 336         interface_set_available(iface, false);
 337
 338         interface_flush_state(iface);
 339         interface_clear_errors(iface);
 340         interface_set_proto_state(iface, NULL);
 341
 342         if (iface->main_dev.dev)
 343                 interface_set_main_dev(iface, NULL);
 344 }
 345
 346 static void
 347 interface_cleanup(struct interface *iface)
 348 {
 349         struct interface_user *dep, *tmp;
 350
 351         if (iface->parent_iface.iface)
 352                 interface_remove_user(&iface->parent_iface);
 353
 354         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 355                 interface_remove_user(dep);
 356
 357         interface_ip_flush(&iface->config_ip);
 358         interface_cleanup_state(iface);
 359 }
 360
 361 static void
 362 interface_do_free(struct interface *iface)
 363 {
 364         interface_event(iface, IFEV_FREE);
 365         interface_cleanup(iface);
 366         free(iface->config);
 367         netifd_ubus_remove_interface(iface);
 368         avl_delete(&interfaces.avl, &iface->node.avl);
 369         free(iface);
 370 }
 371
 372 static void
 373 interface_do_reload(struct interface *iface)
 374 {
 375         interface_event(iface, IFEV_RELOAD);
 376         interface_cleanup_state(iface);
 377         proto_init_interface(iface, iface->config);
 378         interface_claim_device(iface);
 379 }
 380
 381 static void
 382 interface_handle_config_change(struct interface *iface)
 383 {
 384         enum interface_config_state state = iface->config_state;
 385
 386         iface->config_state = IFC_NORMAL;
 387         switch(state) {
 388         case IFC_NORMAL:
 389                 break;
 390         case IFC_RELOAD:
 391                 interface_do_reload(iface);
 392                 break;
 393         case IFC_REMOVE:
 394                 interface_do_free(iface);
 395                 return;
 396         }
 397         if (iface->autostart && iface->available)
 398                 interface_set_up(iface);
 399 }
 400
 401 static void
 402 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 403 {
 404         struct interface *iface = state->iface;
 405
 406         switch (ev) {
 407         case IFPEV_UP:
 408                 if (iface->state != IFS_SETUP)
 409                         return;
 410
 411                 interface_ip_set_enabled(&iface->config_ip, true);
 412                 system_flush_routes();
 413                 iface->state = IFS_UP;
 414                 iface->start_time = system_get_rtime();
 415                 interface_event(iface, IFEV_UP);
 416                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 417                 break;
 418         case IFPEV_DOWN:
 419                 if (iface->state == IFS_DOWN)
 420                         return;
 421
 422                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 423                 mark_interface_down(iface);
 424                 if (iface->main_dev.dev)
 425                         device_release(&iface->main_dev);
 426                 interface_handle_config_change(iface);
 427                 break;
 428         case IFPEV_LINK_LOST:
 429                 if (iface->state != IFS_UP)
 430                         return;
 431
 432                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 433                 mark_interface_down(iface);
 434                 iface->state = IFS_SETUP;
 435                 break;
 436         }
 437
 438         interface_write_resolv_conf();
 439 }
 440
 441 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 442 {
 443         if (iface->proto) {
 444                 iface->proto->free(iface->proto);
 445                 iface->proto = NULL;
 446         }
 447         iface->state = IFS_DOWN;
 448         iface->proto = state;
 449         if (!state)
 450                 return;
 451
 452         state->proto_event = interface_proto_cb;
 453         state->iface = iface;
 454 }
 455
 456 void
 457 interface_init(struct interface *iface, const char *name,
 458                struct blob_attr *config)
 459 {
 460         struct blob_attr *tb[IFACE_ATTR_MAX];
 461         struct blob_attr *cur;
 462         const char *proto_name = NULL;
 463
 464         strncpy(iface->name, name, sizeof(iface->name) - 1);
 465         INIT_LIST_HEAD(&iface->errors);
 466         INIT_LIST_HEAD(&iface->users);
 467         INIT_LIST_HEAD(&iface->hotplug_list);
 468         interface_ip_init(iface);
 469         avl_init(&iface->data, avl_strcmp, false, NULL);
 470         iface->config_ip.enabled = false;
 471
 472         iface->main_dev.cb = interface_cb;
 473
 474         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 475                       blob_data(config), blob_len(config));
 476
 477         if ((cur = tb[IFACE_ATTR_PROTO]))
 478                 proto_name = blobmsg_data(cur);
 479
 480         proto_attach_interface(iface, proto_name);
 481
 482         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 483         iface->proto_ip.no_defaultroute =
 484                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 485         iface->proto_ip.no_dns =
 486                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 487
 488         if ((cur = tb[IFACE_ATTR_DNS]))
 489                 interface_add_dns_server_list(&iface->config_ip, cur);
 490
 491         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 492                 interface_add_dns_search_list(&iface->config_ip, cur);
 493
 494         if ((cur = tb[IFACE_ATTR_METRIC]))
 495                 iface->metric = blobmsg_get_u32(cur);
 496
 497         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 498                 iface->config_ip.assignment_length = blobmsg_get_u32(cur);
 499
 500         iface->config_ip.assignment_hint = -1;
 501         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 502                 iface->config_ip.assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 503                                 ~((1 << (64 - iface->config_ip.assignment_length)) - 1);
 504
 505         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 506                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 507                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 508         }
 509
 510         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 511
 512         iface->ip6table = 1000 + ++interface_serial;
 513         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 514                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 515                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 516         }
 517
 518         iface->config_autostart = iface->autostart;
 519 }
 520
 521 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 522 {
 523         struct blob_attr *tb[IFACE_ATTR_MAX];
 524         struct blob_attr *cur;
 525
 526         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 527                       blob_data(config), blob_len(config));
 528
 529         if (alias) {
 530                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 531                         iface->parent_ifname = blobmsg_data(cur);
 532
 533                 if (!iface->parent_ifname)
 534                         return false;
 535         } else {
 536                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 537                         iface->ifname = blobmsg_data(cur);
 538         }
 539
 540
 541         iface->config = config;
 542         vlist_add(&interfaces, &iface->node, iface->name);
 543         return true;
 544 }
 545
 546 void
 547 interface_add(struct interface *iface, struct blob_attr *config)
 548 {
 549         __interface_add(iface, config, false);
 550 }
 551
 552 bool
 553 interface_add_alias(struct interface *iface, struct blob_attr *config)
 554 {
 555         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 556                 return false;
 557
 558         return __interface_add(iface, config, true);
 559 }
 560
 561 void
 562 interface_set_l3_dev(struct interface *iface, struct device *dev)
 563 {
 564         bool enabled = iface->config_ip.enabled;
 565         bool claimed = iface->l3_dev.claimed;
 566
 567         if (iface->l3_dev.dev == dev)
 568                 return;
 569
 570         interface_ip_set_enabled(&iface->config_ip, false);
 571         interface_ip_flush(&iface->proto_ip);
 572         device_add_user(&iface->l3_dev, dev);
 573
 574         if (dev) {
 575                 if (claimed)
 576                         device_claim(&iface->l3_dev);
 577                 interface_ip_set_enabled(&iface->config_ip, enabled);
 578         }
 579 }
 580
 581 void
 582 interface_set_main_dev(struct interface *iface, struct device *dev)
 583 {
 584         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 585         bool claimed = iface->l3_dev.claimed;
 586
 587         if (iface->main_dev.dev == dev)
 588                 return;
 589
 590         if (set_l3)
 591                 interface_set_l3_dev(iface, dev);
 592
 593         device_add_user(&iface->main_dev, dev);
 594         if (claimed)
 595                 device_claim(&iface->l3_dev);
 596
 597         if (!iface->l3_dev.dev)
 598                 interface_set_l3_dev(iface, dev);
 599 }
 600
 601 int
 602 interface_remove_link(struct interface *iface, struct device *dev)
 603 {
 604         struct device *mdev = iface->main_dev.dev;
 605
 606         if (mdev && mdev->hotplug_ops)
 607                 return mdev->hotplug_ops->del(mdev, dev);
 608
 609         if (!iface->main_dev.hotplug)
 610                 return UBUS_STATUS_INVALID_ARGUMENT;
 611
 612         if (dev != iface->main_dev.dev)
 613                 return UBUS_STATUS_INVALID_ARGUMENT;
 614
 615         device_remove_user(&iface->main_dev);
 616         return 0;
 617 }
 618
 619 int
 620 interface_add_link(struct interface *iface, struct device *dev)
 621 {
 622         struct device *mdev = iface->main_dev.dev;
 623
 624         if (mdev == dev)
 625                 return 0;
 626
 627         if (iface->main_dev.hotplug)
 628                 device_remove_user(&iface->main_dev);
 629
 630         if (mdev) {
 631                 if (mdev->hotplug_ops)
 632                         return mdev->hotplug_ops->add(mdev, dev);
 633                 else
 634                         return UBUS_STATUS_NOT_SUPPORTED;
 635         }
 636
 637         interface_set_main_dev(iface, dev);
 638         iface->main_dev.hotplug = true;
 639         return 0;
 640 }
 641
 642 int
 643 interface_set_up(struct interface *iface)
 644 {
 645         int ret;
 646
 647         iface->autostart = true;
 648
 649         if (iface->state != IFS_DOWN)
 650                 return 0;
 651
 652         interface_clear_errors(iface);
 653         if (!iface->available) {
 654                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 655                 return -1;
 656         }
 657
 658         if (iface->main_dev.dev) {
 659                 ret = device_claim(&iface->main_dev);
 660                 if (ret)
 661                         return ret;
 662         }
 663
 664         iface->state = IFS_SETUP;
 665         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 666         if (ret) {
 667                 mark_interface_down(iface);
 668                 return ret;
 669         }
 670
 671         return 0;
 672 }
 673
 674 int
 675 interface_set_down(struct interface *iface)
 676 {
 677         if (!iface) {
 678                 vlist_for_each_element(&interfaces, iface, node)
 679                         __interface_set_down(iface, false);
 680         } else {
 681                 iface->autostart = false;
 682                 __interface_set_down(iface, false);
 683         }
 684
 685         return 0;
 686 }
 687
 688 void
 689 interface_start_pending(void)
 690 {
 691         struct interface *iface;
 692
 693         vlist_for_each_element(&interfaces, iface, node) {
 694                 if (iface->available && iface->autostart)
 695                         interface_set_up(iface);
 696         }
 697 }
 698
 699 static void
 700 set_config_state(struct interface *iface, enum interface_config_state s)
 701 {
 702         iface->config_state = s;
 703         if (iface->state == IFS_DOWN)
 704                 interface_handle_config_change(iface);
 705         else
 706                 __interface_set_down(iface, false);
 707 }
 708
 709 void
 710 interface_update_start(struct interface *iface)
 711 {
 712         interface_ip_update_start(&iface->proto_ip);
 713 }
 714
 715 void
 716 interface_update_complete(struct interface *iface)
 717 {
 718         interface_ip_update_complete(&iface->proto_ip);
 719 }
 720
 721 static void
 722 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 723 {
 724         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 725         vlist_simple_replace(&new->dns_search, &old->dns_search);
 726 }
 727
 728 static void
 729 interface_change_config(struct interface *if_old, struct interface *if_new)
 730 {
 731         struct blob_attr *old_config = if_old->config;
 732         bool reload = false, reload_ip = false, reload_assignment = false;
 733
 734 #define FIELD_CHANGED_STR(field)                                        \
 735                 ((!!if_old->field != !!if_new->field) ||                \
 736                  (if_old->field &&                                      \
 737                   strcmp(if_old->field, if_new->field) != 0))
 738
 739         if (FIELD_CHANGED_STR(parent_ifname)) {
 740                 if (if_old->parent_iface.iface)
 741                         interface_remove_user(&if_old->parent_iface);
 742                 reload = true;
 743         }
 744
 745         if (FIELD_CHANGED_STR(ifname) ||
 746             if_old->proto_handler != if_new->proto_handler)
 747                 reload = true;
 748
 749         if (!if_old->proto_handler->config_params)
 750                 D(INTERFACE, "No config parameters for interface '%s'\n",
 751                   if_old->name);
 752         else if (!config_check_equal(if_old->config, if_new->config,
 753                                      if_old->proto_handler->config_params))
 754                 reload = true;
 755
 756 #define UPDATE(field, __var) ({                                         \
 757                 bool __changed = (if_old->field != if_new->field);      \
 758                 if_old->field = if_new->field;                          \
 759                 __var |= __changed;                                     \
 760         })
 761
 762         if_old->config = if_new->config;
 763         if (!if_old->config_autostart && if_new->config_autostart)
 764                 if_old->autostart = true;
 765
 766         if_old->device_config = if_new->device_config;
 767         if_old->config_autostart = if_new->config_autostart;
 768         if_old->ifname = if_new->ifname;
 769         if_old->parent_ifname = if_new->parent_ifname;
 770         if_old->proto_handler = if_new->proto_handler;
 771
 772         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 773         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 774
 775         UPDATE(metric, reload_ip);
 776         UPDATE(proto_ip.no_defaultroute, reload_ip);
 777         UPDATE(config_ip.assignment_length, reload_assignment);
 778         UPDATE(config_ip.assignment_hint, reload_assignment);
 779
 780 #undef UPDATE
 781
 782         if (reload) {
 783                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 784                   if_old->name);
 785                 interface_clear_errors(if_old);
 786                 set_config_state(if_old, IFC_RELOAD);
 787                 goto out;
 788         }
 789
 790         if (reload_ip) {
 791                 interface_ip_set_enabled(&if_old->config_ip, false);
 792                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 793                 interface_ip_set_enabled(&if_old->proto_ip, false);
 794                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 795         }
 796
 797         if (reload_assignment)
 798                 interface_refresh_assignments(true);
 799
 800         interface_write_resolv_conf();
 801
 802 out:
 803         if_new->config = NULL;
 804         interface_cleanup(if_new);
 805         free(old_config);
 806         free(if_new);
 807 }
 808
 809 static void
 810 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 811                  struct vlist_node *node_old)
 812 {
 813         struct interface *if_old = container_of(node_old, struct interface, node);
 814         struct interface *if_new = container_of(node_new, struct interface, node);
 815
 816         if (node_old && node_new) {
 817                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 818                 interface_change_config(if_old, if_new);
 819         } else if (node_old) {
 820                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 821                 set_config_state(if_old, IFC_REMOVE);
 822         } else if (node_new) {
 823                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 824                 proto_init_interface(if_new, if_new->config);
 825                 interface_claim_device(if_new);
 826                 netifd_ubus_add_interface(if_new);
 827         }
 828 }
 829
 830
 831 static void __init
 832 interface_init_list(void)
 833 {
 834         vlist_init(&interfaces, avl_strcmp, interface_update);
 835         interfaces.keep_old = true;
 836         interfaces.no_delete = true;
 837 }