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
  30 enum {
  31         IFACE_ATTR_IFNAME,
  32         IFACE_ATTR_PROTO,
  33         IFACE_ATTR_AUTO,
  34         IFACE_ATTR_DEFAULTROUTE,
  35         IFACE_ATTR_PEERDNS,
  36         IFACE_ATTR_DNS,
  37         IFACE_ATTR_DNS_SEARCH,
  38         IFACE_ATTR_METRIC,
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IP6ASSIGN,
  41         IFACE_ATTR_IP6HINT,
  42         IFACE_ATTR_IP4TABLE,
  43         IFACE_ATTR_IP6TABLE,
  44         IFACE_ATTR_IP6CLASS,
  45         IFACE_ATTR_DELEGATE,
  46         IFACE_ATTR_MAX
  47 };
  48
  49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  50         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  64         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  65 };
  66
  67 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  68         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  70 };
  71
  72 const struct uci_blob_param_list interface_attr_list = {
  73         .n_params = IFACE_ATTR_MAX,
  74         .params = iface_attrs,
  75         .info = iface_attr_info,
  76 };
  77
  78 static void
  79 interface_clear_errors(struct interface *iface)
  80 {
  81         struct interface_error *error, *tmp;
  82
  83         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  84                 list_del(&error->list);
  85                 free(error);
  86         }
  87 }
  88
  89 void interface_add_error(struct interface *iface, const char *subsystem,
  90                          const char *code, const char **data, int n_data)
  91 {
  92         struct interface_error *error;
  93         int i, len = 0;
  94         int *datalen = NULL;
  95         char *dest, *d_subsys, *d_code;
  96
  97         if (n_data) {
  98                 len = n_data * sizeof(char *);
  99                 datalen = alloca(len);
 100                 for (i = 0; i < n_data; i++) {
 101                         datalen[i] = strlen(data[i]) + 1;
 102                         len += datalen[i];
 103                 }
 104         }
 105
 106         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 107                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 108                 &d_code, code ? strlen(code) + 1 : 0);
 109         if (!error)
 110                 return;
 111
 112         list_add_tail(&error->list, &iface->errors);
 113
 114         dest = (char *) &error->data[n_data + 1];
 115         for (i = 0; i < n_data; i++) {
 116                 error->data[i] = dest;
 117                 memcpy(dest, data[i], datalen[i]);
 118                 dest += datalen[i];
 119         }
 120         error->data[n_data++] = NULL;
 121
 122         if (subsystem)
 123                 error->subsystem = strcpy(d_subsys, subsystem);
 124
 125         if (code)
 126                 error->code = strcpy(d_code, code);
 127 }
 128
 129 static void
 130 interface_data_del(struct interface *iface, struct interface_data *data)
 131 {
 132         avl_delete(&iface->data, &data->node);
 133         free(data);
 134 }
 135
 136 static void
 137 interface_data_flush(struct interface *iface)
 138 {
 139         struct interface_data *d, *tmp;
 140
 141         avl_for_each_element_safe(&iface->data, d, node, tmp)
 142                 interface_data_del(iface, d);
 143 }
 144
 145 int
 146 interface_add_data(struct interface *iface, const struct blob_attr *data)
 147 {
 148         struct interface_data *n, *o;
 149
 150         if (!blobmsg_check_attr(data, true))
 151                 return UBUS_STATUS_INVALID_ARGUMENT;
 152
 153         const char *name = blobmsg_name(data);
 154         unsigned len = blob_pad_len(data);
 155
 156         o = avl_find_element(&iface->data, name, o, node);
 157         if (o) {
 158                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 159                         return 0;
 160
 161                 interface_data_del(iface, o);
 162         }
 163
 164         n = calloc(1, sizeof(*n) + len);
 165         memcpy(n->data, data, len);
 166         n->node.key = blobmsg_name(n->data);
 167         avl_insert(&iface->data, &n->node);
 168
 169         iface->updated |= IUF_DATA;
 170         return 0;
 171 }
 172
 173 static void
 174 interface_event(struct interface *iface, enum interface_event ev)
 175 {
 176         struct interface_user *dep, *tmp;
 177         struct device *adev = NULL;
 178
 179         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 180                 dep->cb(dep, iface, ev);
 181
 182         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 183                 dep->cb(dep, iface, ev);
 184
 185         switch (ev) {
 186         case IFEV_UP:
 187                 adev = iface->l3_dev.dev;
 188                 /* fall through */
 189         case IFEV_DOWN:
 190                 alias_notify_device(iface->name, adev);
 191                 break;
 192         default:
 193                 break;
 194         }
 195 }
 196
 197 static void
 198 interface_flush_state(struct interface *iface)
 199 {
 200         if (iface->l3_dev.dev)
 201                 device_release(&iface->l3_dev);
 202         interface_data_flush(iface);
 203 }
 204
 205 static void
 206 mark_interface_down(struct interface *iface)
 207 {
 208         enum interface_state state = iface->state;
 209
 210         if (state == IFS_DOWN)
 211                 return;
 212
 213         iface->state = IFS_DOWN;
 214         if (state == IFS_UP)
 215                 interface_event(iface, IFEV_DOWN);
 216         interface_ip_set_enabled(&iface->config_ip, false);
 217         interface_ip_flush(&iface->proto_ip);
 218         interface_flush_state(iface);
 219         system_flush_routes();
 220 }
 221
 222 void
 223 __interface_set_down(struct interface *iface, bool force)
 224 {
 225         enum interface_state state = iface->state;
 226         switch (state) {
 227         case IFS_UP:
 228         case IFS_SETUP:
 229                 iface->state = IFS_TEARDOWN;
 230                 if (state == IFS_UP)
 231                         interface_event(iface, IFEV_DOWN);
 232
 233                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 234                 if (force)
 235                         interface_flush_state(iface);
 236
 237                 if (iface->dynamic)
 238                         vlist_delete(&interfaces, &iface->node);
 239                 break;
 240
 241         case IFS_DOWN:
 242                 if (iface->main_dev.dev)
 243                         device_release(&iface->main_dev);
 244         case IFS_TEARDOWN:
 245         default:
 246                 break;
 247         }
 248 }
 249
 250 static int
 251 __interface_set_up(struct interface *iface)
 252 {
 253         int ret;
 254
 255         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 256
 257         iface->state = IFS_SETUP;
 258         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 259         if (ret)
 260                 mark_interface_down(iface);
 261
 262         return ret;
 263 }
 264
 265 static void
 266 interface_check_state(struct interface *iface)
 267 {
 268         switch (iface->state) {
 269         case IFS_UP:
 270                 if (!iface->enabled || !iface->link_state) {
 271                         mark_interface_down(iface);
 272                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 273                 }
 274                 break;
 275         case IFS_DOWN:
 276                 if (iface->autostart && iface->enabled && iface->link_state && !config_init)
 277                         __interface_set_up(iface);
 278                 break;
 279         default:
 280                 break;
 281         }
 282 }
 283
 284 static void
 285 interface_set_enabled(struct interface *iface, bool new_state)
 286 {
 287         if (iface->enabled == new_state)
 288                 return;
 289
 290         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 291         iface->enabled = new_state;
 292         interface_check_state(iface);
 293 }
 294
 295 static void
 296 interface_set_link_state(struct interface *iface, bool new_state)
 297 {
 298         if (iface->link_state == new_state)
 299                 return;
 300
 301         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 302         iface->link_state = new_state;
 303         interface_check_state(iface);
 304 }
 305
 306 static void
 307 interface_cb(struct device_user *dep, enum device_event ev)
 308 {
 309         struct interface *iface;
 310         bool new_state = false;
 311
 312         iface = container_of(dep, struct interface, main_dev);
 313         switch (ev) {
 314         case DEV_EVENT_ADD:
 315                 new_state = true;
 316         case DEV_EVENT_REMOVE:
 317                 interface_set_available(iface, new_state);
 318                 if (!new_state && dep->dev->external)
 319                         interface_set_main_dev(iface, NULL);
 320                 break;
 321         case DEV_EVENT_UP:
 322                 new_state = true;
 323         case DEV_EVENT_DOWN:
 324                 interface_set_enabled(iface, new_state);
 325                 break;
 326         case DEV_EVENT_LINK_UP:
 327                 new_state = true;
 328         case DEV_EVENT_LINK_DOWN:
 329                 interface_set_link_state(iface, new_state);
 330                 break;
 331         default:
 332                 break;
 333         }
 334 }
 335
 336 void
 337 interface_set_available(struct interface *iface, bool new_state)
 338 {
 339         if (iface->available == new_state)
 340                 return;
 341
 342         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 343         iface->available = new_state;
 344
 345         if (new_state) {
 346                 if (iface->autostart && !config_init)
 347                         interface_set_up(iface);
 348         } else
 349                 __interface_set_down(iface, true);
 350 }
 351
 352 void
 353 interface_add_user(struct interface_user *dep, struct interface *iface)
 354 {
 355         if (!iface) {
 356                 list_add(&dep->list, &iface_all_users);
 357                 return;
 358         }
 359
 360         dep->iface = iface;
 361         list_add(&dep->list, &iface->users);
 362         if (iface->state == IFS_UP)
 363                 dep->cb(dep, iface, IFEV_UP);
 364 }
 365
 366 void
 367 interface_remove_user(struct interface_user *dep)
 368 {
 369         list_del_init(&dep->list);
 370         dep->iface = NULL;
 371 }
 372
 373 static void
 374 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 375 {
 376         struct blob_attr *cur;
 377         int rem;
 378
 379         blobmsg_for_each_attr(cur, list, rem) {
 380                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 381                         continue;
 382
 383                 if (!blobmsg_check_attr(cur, NULL))
 384                         continue;
 385
 386                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 387                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 388                 list_add(&c->head, &iface->assignment_classes);
 389         }
 390 }
 391
 392 static void
 393 interface_clear_assignment_classes(struct interface *iface)
 394 {
 395         while (!list_empty(&iface->assignment_classes)) {
 396                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 397                                 struct interface_assignment_class, head);
 398                 list_del(&c->head);
 399                 free(c);
 400         }
 401 }
 402
 403 static void
 404 interface_merge_assignment_data(struct interface *old, struct interface *new)
 405 {
 406         bool changed = (old->assignment_hint != new->assignment_hint ||
 407                         old->assignment_length != new->assignment_length ||
 408                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 409
 410         struct interface_assignment_class *c;
 411         list_for_each_entry(c, &new->assignment_classes, head) {
 412                 // Compare list entries one-by-one to see if there was a change
 413                 if (list_empty(&old->assignment_classes)) // The new list is longer
 414                         changed = true;
 415
 416                 if (changed)
 417                         break;
 418
 419                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 420                                 struct interface_assignment_class, head);
 421
 422                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 423                         break;
 424
 425                 list_del(&c_old->head);
 426                 free(c_old);
 427         }
 428
 429         // The old list was longer than the new one or the last entry didn't match
 430         if (!list_empty(&old->assignment_classes)) {
 431                 interface_clear_assignment_classes(old);
 432                 changed = true;
 433         }
 434
 435         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 436
 437         if (changed) {
 438                 old->assignment_hint = new->assignment_hint;
 439                 old->assignment_length = new->assignment_length;
 440                 interface_refresh_assignments(true);
 441         }
 442 }
 443
 444 static void
 445 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 446 {
 447         struct interface *alias = container_of(dep, struct interface, parent_iface);
 448         struct device *dev = iface->l3_dev.dev;
 449
 450         switch (ev) {
 451         case IFEV_UP:
 452                 if (!dev)
 453                         return;
 454
 455                 interface_set_main_dev(alias, dev);
 456                 interface_set_available(alias, true);
 457                 break;
 458         case IFEV_DOWN:
 459                 interface_set_available(alias, false);
 460                 interface_set_main_dev(alias, NULL);
 461                 break;
 462         case IFEV_FREE:
 463                 interface_remove_user(dep);
 464                 break;
 465         case IFEV_RELOAD:
 466         case IFEV_UPDATE:
 467                 break;
 468         }
 469 }
 470
 471 static void
 472 interface_claim_device(struct interface *iface)
 473 {
 474         struct interface *parent;
 475         struct device *dev = NULL;
 476
 477         if (iface->parent_iface.iface)
 478                 interface_remove_user(&iface->parent_iface);
 479
 480         if (iface->parent_ifname) {
 481                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 482                 iface->parent_iface.cb = interface_alias_cb;
 483                 interface_add_user(&iface->parent_iface, parent);
 484         } else if (iface->ifname &&
 485                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 486                 dev = device_get(iface->ifname, true);
 487         }
 488
 489         if (dev)
 490                 interface_set_main_dev(iface, dev);
 491
 492         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 493                 interface_set_available(iface, true);
 494 }
 495
 496 static void
 497 interface_cleanup_state(struct interface *iface)
 498 {
 499         interface_set_available(iface, false);
 500
 501         interface_flush_state(iface);
 502         interface_clear_errors(iface);
 503         interface_set_proto_state(iface, NULL);
 504
 505         if (iface->main_dev.dev)
 506                 interface_set_main_dev(iface, NULL);
 507 }
 508
 509 static void
 510 interface_cleanup(struct interface *iface)
 511 {
 512         struct interface_user *dep, *tmp;
 513
 514         if (iface->parent_iface.iface)
 515                 interface_remove_user(&iface->parent_iface);
 516
 517         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 518                 interface_remove_user(dep);
 519
 520         interface_clear_assignment_classes(iface);
 521         interface_ip_flush(&iface->config_ip);
 522         interface_cleanup_state(iface);
 523 }
 524
 525 static void
 526 interface_do_free(struct interface *iface)
 527 {
 528         interface_event(iface, IFEV_FREE);
 529         interface_cleanup(iface);
 530         free(iface->config);
 531         netifd_ubus_remove_interface(iface);
 532         avl_delete(&interfaces.avl, &iface->node.avl);
 533         free(iface);
 534 }
 535
 536 static void
 537 interface_do_reload(struct interface *iface)
 538 {
 539         interface_event(iface, IFEV_RELOAD);
 540         interface_cleanup_state(iface);
 541         proto_init_interface(iface, iface->config);
 542         interface_claim_device(iface);
 543 }
 544
 545 static void
 546 interface_handle_config_change(struct interface *iface)
 547 {
 548         enum interface_config_state state = iface->config_state;
 549
 550         iface->config_state = IFC_NORMAL;
 551         switch(state) {
 552         case IFC_NORMAL:
 553                 break;
 554         case IFC_RELOAD:
 555                 interface_do_reload(iface);
 556                 break;
 557         case IFC_REMOVE:
 558                 interface_do_free(iface);
 559                 return;
 560         }
 561         if (iface->autostart && iface->available)
 562                 interface_set_up(iface);
 563 }
 564
 565 static void
 566 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 567 {
 568         struct interface *iface = state->iface;
 569
 570         switch (ev) {
 571         case IFPEV_UP:
 572                 if (iface->state != IFS_SETUP) {
 573                         interface_event(iface, IFEV_UPDATE);
 574                         return;
 575                 }
 576
 577                 interface_ip_set_enabled(&iface->config_ip, true);
 578                 system_flush_routes();
 579                 iface->state = IFS_UP;
 580                 iface->start_time = system_get_rtime();
 581                 interface_event(iface, IFEV_UP);
 582                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 583                 break;
 584         case IFPEV_DOWN:
 585                 if (iface->state == IFS_DOWN)
 586                         return;
 587
 588                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 589                 mark_interface_down(iface);
 590                 if (iface->main_dev.dev)
 591                         device_release(&iface->main_dev);
 592                 interface_handle_config_change(iface);
 593                 break;
 594         case IFPEV_LINK_LOST:
 595                 if (iface->state != IFS_UP)
 596                         return;
 597
 598                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 599                 mark_interface_down(iface);
 600                 iface->state = IFS_SETUP;
 601                 break;
 602         }
 603
 604         interface_write_resolv_conf();
 605 }
 606
 607 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 608 {
 609         if (iface->proto) {
 610                 iface->proto->free(iface->proto);
 611                 iface->proto = NULL;
 612         }
 613         iface->state = IFS_DOWN;
 614         iface->proto = state;
 615         if (!state)
 616                 return;
 617
 618         state->proto_event = interface_proto_cb;
 619         state->iface = iface;
 620 }
 621
 622 struct interface *
 623 interface_alloc(const char *name, struct blob_attr *config)
 624 {
 625         struct interface *iface;
 626         struct blob_attr *tb[IFACE_ATTR_MAX];
 627         struct blob_attr *cur;
 628         const char *proto_name = NULL;
 629         char *iface_name;
 630
 631         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 632         iface->name = strcpy(iface_name, name);
 633         INIT_LIST_HEAD(&iface->errors);
 634         INIT_LIST_HEAD(&iface->users);
 635         INIT_LIST_HEAD(&iface->hotplug_list);
 636         INIT_LIST_HEAD(&iface->assignment_classes);
 637         interface_ip_init(iface);
 638         avl_init(&iface->data, avl_strcmp, false, NULL);
 639         iface->config_ip.enabled = false;
 640
 641         iface->main_dev.cb = interface_cb;
 642
 643         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 644                       blob_data(config), blob_len(config));
 645
 646         if ((cur = tb[IFACE_ATTR_PROTO]))
 647                 proto_name = blobmsg_data(cur);
 648
 649         proto_attach_interface(iface, proto_name);
 650
 651         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 652         iface->proto_ip.no_defaultroute =
 653                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 654         iface->proto_ip.no_dns =
 655                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 656
 657         if ((cur = tb[IFACE_ATTR_DNS]))
 658                 interface_add_dns_server_list(&iface->config_ip, cur);
 659
 660         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 661                 interface_add_dns_search_list(&iface->config_ip, cur);
 662
 663         if ((cur = tb[IFACE_ATTR_METRIC]))
 664                 iface->metric = blobmsg_get_u32(cur);
 665
 666         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 667                 iface->assignment_length = blobmsg_get_u32(cur);
 668
 669         iface->assignment_hint = -1;
 670         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 671                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 672                                 ~((1 << (64 - iface->assignment_length)) - 1);
 673
 674         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 675                 interface_add_assignment_classes(iface, cur);
 676
 677
 678         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 679                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 680                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 681         }
 682
 683         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 684                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 685                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 686         }
 687
 688         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 689
 690         iface->config_autostart = iface->autostart;
 691         return iface;
 692 }
 693
 694 void interface_set_dynamic(struct interface *iface)
 695 {
 696         iface->dynamic = true;
 697         iface->node.version = -1; // Don't delete on reload
 698 }
 699
 700 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 701 {
 702         struct blob_attr *tb[IFACE_ATTR_MAX];
 703         struct blob_attr *cur;
 704
 705         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 706                       blob_data(config), blob_len(config));
 707
 708         if (alias) {
 709                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 710                         iface->parent_ifname = blobmsg_data(cur);
 711
 712                 if (!iface->parent_ifname)
 713                         return false;
 714         } else {
 715                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 716                         iface->ifname = blobmsg_data(cur);
 717         }
 718
 719
 720         iface->config = config;
 721         vlist_add(&interfaces, &iface->node, iface->name);
 722         return true;
 723 }
 724
 725 void
 726 interface_add(struct interface *iface, struct blob_attr *config)
 727 {
 728         __interface_add(iface, config, false);
 729 }
 730
 731 bool
 732 interface_add_alias(struct interface *iface, struct blob_attr *config)
 733 {
 734         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 735                 return false;
 736
 737         return __interface_add(iface, config, true);
 738 }
 739
 740 void
 741 interface_set_l3_dev(struct interface *iface, struct device *dev)
 742 {
 743         bool enabled = iface->config_ip.enabled;
 744         bool claimed = iface->l3_dev.claimed;
 745
 746         if (iface->l3_dev.dev == dev)
 747                 return;
 748
 749         interface_ip_set_enabled(&iface->config_ip, false);
 750         interface_ip_flush(&iface->proto_ip);
 751         device_add_user(&iface->l3_dev, dev);
 752
 753         if (dev) {
 754                 if (claimed)
 755                         device_claim(&iface->l3_dev);
 756                 interface_ip_set_enabled(&iface->config_ip, enabled);
 757         }
 758 }
 759
 760 void
 761 interface_set_main_dev(struct interface *iface, struct device *dev)
 762 {
 763         bool set_l3 = (!dev || iface->main_dev.dev == iface->l3_dev.dev);
 764         bool claimed = iface->l3_dev.claimed;
 765
 766         if (iface->main_dev.dev == dev)
 767                 return;
 768
 769         if (set_l3)
 770                 interface_set_l3_dev(iface, dev);
 771
 772         device_add_user(&iface->main_dev, dev);
 773         if (!dev) {
 774                 interface_set_link_state(iface, false);
 775                 return;
 776         }
 777
 778         if (claimed)
 779                 device_claim(&iface->l3_dev);
 780
 781         if (!iface->l3_dev.dev)
 782                 interface_set_l3_dev(iface, dev);
 783 }
 784
 785 int
 786 interface_remove_link(struct interface *iface, struct device *dev)
 787 {
 788         struct device *mdev = iface->main_dev.dev;
 789
 790         if (mdev && mdev->hotplug_ops)
 791                 return mdev->hotplug_ops->del(mdev, dev);
 792
 793         if (!iface->main_dev.hotplug)
 794                 return UBUS_STATUS_INVALID_ARGUMENT;
 795
 796         if (dev != iface->main_dev.dev)
 797                 return UBUS_STATUS_INVALID_ARGUMENT;
 798
 799         device_remove_user(&iface->main_dev);
 800         return 0;
 801 }
 802
 803 int
 804 interface_add_link(struct interface *iface, struct device *dev)
 805 {
 806         struct device *mdev = iface->main_dev.dev;
 807
 808         if (mdev == dev)
 809                 return 0;
 810
 811         if (iface->main_dev.hotplug)
 812                 device_remove_user(&iface->main_dev);
 813
 814         if (mdev) {
 815                 if (mdev->hotplug_ops)
 816                         return mdev->hotplug_ops->add(mdev, dev);
 817                 else
 818                         return UBUS_STATUS_NOT_SUPPORTED;
 819         }
 820
 821         interface_set_main_dev(iface, dev);
 822         iface->main_dev.hotplug = true;
 823         return 0;
 824 }
 825
 826 int
 827 interface_handle_link(struct interface *iface, const char *name, bool add)
 828 {
 829         struct device *dev;
 830         int ret;
 831
 832         device_lock();
 833
 834         dev = device_get(name, add ? 2 : 0);
 835         if (!dev) {
 836                 ret = UBUS_STATUS_NOT_FOUND;
 837                 goto out;
 838         }
 839
 840         if (add) {
 841                 device_set_present(dev, true);
 842                 if (iface->device_config)
 843                         device_set_config(dev, &simple_device_type, iface->config);
 844
 845                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 846                 ret = interface_add_link(iface, dev);
 847         } else {
 848                 ret = interface_remove_link(iface, dev);
 849         }
 850
 851 out:
 852         device_unlock();
 853
 854         return ret;
 855 }
 856
 857 int
 858 interface_set_up(struct interface *iface)
 859 {
 860         int ret;
 861
 862         iface->autostart = true;
 863
 864         if (iface->state != IFS_DOWN)
 865                 return 0;
 866
 867         interface_clear_errors(iface);
 868         if (!iface->available) {
 869                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 870                 return -1;
 871         }
 872
 873         if (iface->main_dev.dev) {
 874                 ret = device_claim(&iface->main_dev);
 875                 if (!ret)
 876                         interface_check_state(iface);
 877         }
 878         else
 879                 ret = __interface_set_up(iface);
 880
 881         return ret;
 882 }
 883
 884 int
 885 interface_set_down(struct interface *iface)
 886 {
 887         if (!iface) {
 888                 vlist_for_each_element(&interfaces, iface, node)
 889                         __interface_set_down(iface, false);
 890         } else {
 891                 iface->autostart = false;
 892                 __interface_set_down(iface, false);
 893         }
 894
 895         return 0;
 896 }
 897
 898 void
 899 interface_start_pending(void)
 900 {
 901         struct interface *iface;
 902
 903         vlist_for_each_element(&interfaces, iface, node) {
 904                 if (iface->available && iface->autostart)
 905                         interface_set_up(iface);
 906         }
 907 }
 908
 909 static void
 910 set_config_state(struct interface *iface, enum interface_config_state s)
 911 {
 912         iface->config_state = s;
 913         if (iface->state == IFS_DOWN)
 914                 interface_handle_config_change(iface);
 915         else
 916                 __interface_set_down(iface, false);
 917 }
 918
 919 void
 920 interface_update_start(struct interface *iface)
 921 {
 922         iface->updated = 0;
 923         interface_ip_update_start(&iface->proto_ip);
 924 }
 925
 926 void
 927 interface_update_complete(struct interface *iface)
 928 {
 929         interface_ip_update_complete(&iface->proto_ip);
 930 }
 931
 932 static void
 933 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 934 {
 935         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 936         vlist_simple_replace(&new->dns_search, &old->dns_search);
 937 }
 938
 939 static void
 940 interface_change_config(struct interface *if_old, struct interface *if_new)
 941 {
 942         struct blob_attr *old_config = if_old->config;
 943         bool reload = false, reload_ip = false;
 944
 945 #define FIELD_CHANGED_STR(field)                                        \
 946                 ((!!if_old->field != !!if_new->field) ||                \
 947                  (if_old->field &&                                      \
 948                   strcmp(if_old->field, if_new->field) != 0))
 949
 950         if (FIELD_CHANGED_STR(parent_ifname)) {
 951                 if (if_old->parent_iface.iface)
 952                         interface_remove_user(&if_old->parent_iface);
 953                 reload = true;
 954         }
 955
 956         if (FIELD_CHANGED_STR(ifname) ||
 957             if_old->proto_handler != if_new->proto_handler)
 958                 reload = true;
 959
 960         if (!if_old->proto_handler->config_params)
 961                 D(INTERFACE, "No config parameters for interface '%s'\n",
 962                   if_old->name);
 963         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 964                                        if_old->proto_handler->config_params))
 965                 reload = true;
 966
 967 #define UPDATE(field, __var) ({                                         \
 968                 bool __changed = (if_old->field != if_new->field);      \
 969                 if_old->field = if_new->field;                          \
 970                 __var |= __changed;                                     \
 971         })
 972
 973         if_old->config = if_new->config;
 974         if (!if_old->config_autostart && if_new->config_autostart)
 975                 if_old->autostart = true;
 976
 977         if_old->device_config = if_new->device_config;
 978         if_old->config_autostart = if_new->config_autostart;
 979         if_old->ifname = if_new->ifname;
 980         if_old->parent_ifname = if_new->parent_ifname;
 981         if_old->proto_handler = if_new->proto_handler;
 982
 983         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 984         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 985
 986         UPDATE(metric, reload_ip);
 987         UPDATE(proto_ip.no_defaultroute, reload_ip);
 988         UPDATE(ip4table, reload_ip);
 989         UPDATE(ip6table, reload_ip);
 990         interface_merge_assignment_data(if_old, if_new);
 991
 992 #undef UPDATE
 993
 994         if (reload) {
 995                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
 996                   if_old->name);
 997                 interface_clear_errors(if_old);
 998                 set_config_state(if_old, IFC_RELOAD);
 999                 goto out;
1000         }
1001
1002         if (reload_ip) {
1003                 interface_ip_set_enabled(&if_old->config_ip, false);
1004                 interface_ip_set_enabled(&if_old->proto_ip, false);
1005                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1006                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1007         }
1008
1009         interface_write_resolv_conf();
1010
1011 out:
1012         if_new->config = NULL;
1013         interface_cleanup(if_new);
1014         free(old_config);
1015         free(if_new);
1016 }
1017
1018 static void
1019 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1020                  struct vlist_node *node_old)
1021 {
1022         struct interface *if_old = container_of(node_old, struct interface, node);
1023         struct interface *if_new = container_of(node_new, struct interface, node);
1024
1025         if (node_old && node_new) {
1026                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1027                 interface_change_config(if_old, if_new);
1028         } else if (node_old) {
1029                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1030                 set_config_state(if_old, IFC_REMOVE);
1031         } else if (node_new) {
1032                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1033                 proto_init_interface(if_new, if_new->config);
1034                 interface_claim_device(if_new);
1035                 netifd_ubus_add_interface(if_new);
1036         }
1037 }
1038
1039
1040 static void __init
1041 interface_init_list(void)
1042 {
1043         vlist_init(&interfaces, avl_strcmp, interface_update);
1044         interfaces.keep_old = true;
1045         interfaces.no_delete = true;
1046 }