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_FORCE_LINK,
  47         IFACE_ATTR_MAX
  48 };
  49
  50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  51         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  61         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  66         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  67 };
  68
  69 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  70         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  72 };
  73
  74 const struct uci_blob_param_list interface_attr_list = {
  75         .n_params = IFACE_ATTR_MAX,
  76         .params = iface_attrs,
  77         .info = iface_attr_info,
  78 };
  79
  80 static void
  81 interface_clear_errors(struct interface *iface)
  82 {
  83         struct interface_error *error, *tmp;
  84
  85         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  86                 list_del(&error->list);
  87                 free(error);
  88         }
  89 }
  90
  91 void interface_add_error(struct interface *iface, const char *subsystem,
  92                          const char *code, const char **data, int n_data)
  93 {
  94         struct interface_error *error;
  95         int i, len = 0;
  96         int *datalen = NULL;
  97         char *dest, *d_subsys, *d_code;
  98
  99         if (n_data) {
 100                 len = n_data * sizeof(char *);
 101                 datalen = alloca(len);
 102                 for (i = 0; i < n_data; i++) {
 103                         datalen[i] = strlen(data[i]) + 1;
 104                         len += datalen[i];
 105                 }
 106         }
 107
 108         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 109                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 110                 &d_code, code ? strlen(code) + 1 : 0);
 111         if (!error)
 112                 return;
 113
 114         list_add_tail(&error->list, &iface->errors);
 115
 116         dest = (char *) &error->data[n_data + 1];
 117         for (i = 0; i < n_data; i++) {
 118                 error->data[i] = dest;
 119                 memcpy(dest, data[i], datalen[i]);
 120                 dest += datalen[i];
 121         }
 122         error->data[n_data++] = NULL;
 123
 124         if (subsystem)
 125                 error->subsystem = strcpy(d_subsys, subsystem);
 126
 127         if (code)
 128                 error->code = strcpy(d_code, code);
 129 }
 130
 131 static void
 132 interface_data_del(struct interface *iface, struct interface_data *data)
 133 {
 134         avl_delete(&iface->data, &data->node);
 135         free(data);
 136 }
 137
 138 static void
 139 interface_data_flush(struct interface *iface)
 140 {
 141         struct interface_data *d, *tmp;
 142
 143         avl_for_each_element_safe(&iface->data, d, node, tmp)
 144                 interface_data_del(iface, d);
 145 }
 146
 147 int
 148 interface_add_data(struct interface *iface, const struct blob_attr *data)
 149 {
 150         struct interface_data *n, *o;
 151
 152         if (!blobmsg_check_attr(data, true))
 153                 return UBUS_STATUS_INVALID_ARGUMENT;
 154
 155         const char *name = blobmsg_name(data);
 156         unsigned len = blob_pad_len(data);
 157
 158         o = avl_find_element(&iface->data, name, o, node);
 159         if (o) {
 160                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 161                         return 0;
 162
 163                 interface_data_del(iface, o);
 164         }
 165
 166         n = calloc(1, sizeof(*n) + len);
 167         memcpy(n->data, data, len);
 168         n->node.key = blobmsg_name(n->data);
 169         avl_insert(&iface->data, &n->node);
 170
 171         iface->updated |= IUF_DATA;
 172         return 0;
 173 }
 174
 175 static void
 176 interface_event(struct interface *iface, enum interface_event ev)
 177 {
 178         struct interface_user *dep, *tmp;
 179         struct device *adev = NULL;
 180
 181         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 182                 dep->cb(dep, iface, ev);
 183
 184         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 185                 dep->cb(dep, iface, ev);
 186
 187         switch (ev) {
 188         case IFEV_UP:
 189                 adev = iface->l3_dev.dev;
 190                 /* fall through */
 191         case IFEV_DOWN:
 192                 alias_notify_device(iface->name, adev);
 193                 break;
 194         default:
 195                 break;
 196         }
 197 }
 198
 199 static void
 200 interface_flush_state(struct interface *iface)
 201 {
 202         if (iface->l3_dev.dev)
 203                 device_release(&iface->l3_dev);
 204         interface_data_flush(iface);
 205 }
 206
 207 static void
 208 mark_interface_down(struct interface *iface)
 209 {
 210         enum interface_state state = iface->state;
 211
 212         if (state == IFS_DOWN)
 213                 return;
 214
 215         iface->state = IFS_DOWN;
 216         if (state == IFS_UP)
 217                 interface_event(iface, IFEV_DOWN);
 218         interface_ip_set_enabled(&iface->config_ip, false);
 219         interface_ip_flush(&iface->proto_ip);
 220         interface_flush_state(iface);
 221         system_flush_routes();
 222 }
 223
 224 void
 225 __interface_set_down(struct interface *iface, bool force)
 226 {
 227         enum interface_state state = iface->state;
 228         switch (state) {
 229         case IFS_UP:
 230         case IFS_SETUP:
 231                 iface->state = IFS_TEARDOWN;
 232                 if (state == IFS_UP)
 233                         interface_event(iface, IFEV_DOWN);
 234
 235                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 236                 if (force)
 237                         interface_flush_state(iface);
 238
 239                 if (iface->dynamic)
 240                         vlist_delete(&interfaces, &iface->node);
 241                 break;
 242
 243         case IFS_DOWN:
 244                 if (iface->main_dev.dev)
 245                         device_release(&iface->main_dev);
 246         case IFS_TEARDOWN:
 247         default:
 248                 break;
 249         }
 250 }
 251
 252 static int
 253 __interface_set_up(struct interface *iface)
 254 {
 255         int ret;
 256
 257         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 258
 259         iface->state = IFS_SETUP;
 260         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 261         if (ret)
 262                 mark_interface_down(iface);
 263
 264         return ret;
 265 }
 266
 267 static void
 268 interface_check_state(struct interface *iface)
 269 {
 270         bool link_state = iface->link_state || iface->force_link;
 271
 272         switch (iface->state) {
 273         case IFS_UP:
 274                 if (!iface->enabled || !link_state) {
 275                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 276                         mark_interface_down(iface);
 277                 }
 278                 break;
 279         case IFS_DOWN:
 280                 if (!iface->available)
 281                         return;
 282
 283                 if (iface->autostart && iface->enabled && link_state && !config_init)
 284                         __interface_set_up(iface);
 285                 break;
 286         default:
 287                 break;
 288         }
 289 }
 290
 291 static void
 292 interface_set_enabled(struct interface *iface, bool new_state)
 293 {
 294         if (iface->enabled == new_state)
 295                 return;
 296
 297         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 298         iface->enabled = new_state;
 299         interface_check_state(iface);
 300 }
 301
 302 static void
 303 interface_set_link_state(struct interface *iface, bool new_state)
 304 {
 305         if (iface->link_state == new_state)
 306                 return;
 307
 308         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 309         iface->link_state = new_state;
 310         interface_check_state(iface);
 311 }
 312
 313 static void
 314 interface_ext_cb(struct device_user *dep, enum device_event ev)
 315 {
 316         if (ev == DEV_EVENT_REMOVE)
 317                 device_remove_user(dep);
 318 }
 319
 320 static void
 321 interface_cb(struct device_user *dep, enum device_event ev)
 322 {
 323         struct interface *iface;
 324         bool new_state = false;
 325
 326         iface = container_of(dep, struct interface, main_dev);
 327         switch (ev) {
 328         case DEV_EVENT_ADD:
 329                 new_state = true;
 330         case DEV_EVENT_REMOVE:
 331                 interface_set_available(iface, new_state);
 332                 if (!new_state && dep->dev && dep->dev->external)
 333                         interface_set_main_dev(iface, NULL);
 334                 break;
 335         case DEV_EVENT_UP:
 336                 new_state = true;
 337         case DEV_EVENT_DOWN:
 338                 interface_set_enabled(iface, new_state);
 339                 break;
 340         case DEV_EVENT_LINK_UP:
 341                 new_state = true;
 342         case DEV_EVENT_LINK_DOWN:
 343                 interface_set_link_state(iface, new_state);
 344                 break;
 345         case DEV_EVENT_TOPO_CHANGE:
 346                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 347                 return;
 348         default:
 349                 break;
 350         }
 351 }
 352
 353 void
 354 interface_set_available(struct interface *iface, bool new_state)
 355 {
 356         if (iface->available == new_state)
 357                 return;
 358
 359         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 360         iface->available = new_state;
 361
 362         if (new_state) {
 363                 if (iface->autostart && !config_init)
 364                         interface_set_up(iface);
 365         } else
 366                 __interface_set_down(iface, true);
 367 }
 368
 369 void
 370 interface_add_user(struct interface_user *dep, struct interface *iface)
 371 {
 372         if (!iface) {
 373                 list_add(&dep->list, &iface_all_users);
 374                 return;
 375         }
 376
 377         dep->iface = iface;
 378         list_add(&dep->list, &iface->users);
 379         if (iface->state == IFS_UP)
 380                 dep->cb(dep, iface, IFEV_UP);
 381 }
 382
 383 void
 384 interface_remove_user(struct interface_user *dep)
 385 {
 386         list_del_init(&dep->list);
 387         dep->iface = NULL;
 388 }
 389
 390 static void
 391 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 392 {
 393         struct blob_attr *cur;
 394         int rem;
 395
 396         blobmsg_for_each_attr(cur, list, rem) {
 397                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 398                         continue;
 399
 400                 if (!blobmsg_check_attr(cur, NULL))
 401                         continue;
 402
 403                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 404                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 405                 list_add(&c->head, &iface->assignment_classes);
 406         }
 407 }
 408
 409 static void
 410 interface_clear_assignment_classes(struct interface *iface)
 411 {
 412         while (!list_empty(&iface->assignment_classes)) {
 413                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 414                                 struct interface_assignment_class, head);
 415                 list_del(&c->head);
 416                 free(c);
 417         }
 418 }
 419
 420 static void
 421 interface_merge_assignment_data(struct interface *old, struct interface *new)
 422 {
 423         bool changed = (old->assignment_hint != new->assignment_hint ||
 424                         old->assignment_length != new->assignment_length ||
 425                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 426
 427         struct interface_assignment_class *c;
 428         list_for_each_entry(c, &new->assignment_classes, head) {
 429                 // Compare list entries one-by-one to see if there was a change
 430                 if (list_empty(&old->assignment_classes)) // The new list is longer
 431                         changed = true;
 432
 433                 if (changed)
 434                         break;
 435
 436                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 437                                 struct interface_assignment_class, head);
 438
 439                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 440                         break;
 441
 442                 list_del(&c_old->head);
 443                 free(c_old);
 444         }
 445
 446         // The old list was longer than the new one or the last entry didn't match
 447         if (!list_empty(&old->assignment_classes)) {
 448                 interface_clear_assignment_classes(old);
 449                 changed = true;
 450         }
 451
 452         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 453
 454         if (changed) {
 455                 old->assignment_hint = new->assignment_hint;
 456                 old->assignment_length = new->assignment_length;
 457                 interface_refresh_assignments(true);
 458         }
 459 }
 460
 461 static void
 462 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 463 {
 464         struct interface *alias = container_of(dep, struct interface, parent_iface);
 465         struct device *dev = iface->l3_dev.dev;
 466
 467         switch (ev) {
 468         case IFEV_UP:
 469                 if (!dev)
 470                         return;
 471
 472                 interface_set_main_dev(alias, dev);
 473                 interface_set_available(alias, true);
 474                 break;
 475         case IFEV_DOWN:
 476                 interface_set_available(alias, false);
 477                 interface_set_main_dev(alias, NULL);
 478                 break;
 479         case IFEV_FREE:
 480                 interface_remove_user(dep);
 481                 break;
 482         case IFEV_RELOAD:
 483         case IFEV_UPDATE:
 484                 break;
 485         }
 486 }
 487
 488 static void
 489 interface_claim_device(struct interface *iface)
 490 {
 491         struct interface *parent;
 492         struct device *dev = NULL;
 493
 494         if (iface->parent_iface.iface)
 495                 interface_remove_user(&iface->parent_iface);
 496
 497         if (iface->parent_ifname) {
 498                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 499                 iface->parent_iface.cb = interface_alias_cb;
 500                 interface_add_user(&iface->parent_iface, parent);
 501         } else if (iface->ifname &&
 502                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 503                 dev = device_get(iface->ifname, true);
 504         } else {
 505                 dev = iface->ext_dev.dev;
 506         }
 507
 508         if (dev)
 509                 interface_set_main_dev(iface, dev);
 510
 511         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 512                 interface_set_available(iface, true);
 513 }
 514
 515 static void
 516 interface_cleanup_state(struct interface *iface)
 517 {
 518         interface_set_available(iface, false);
 519
 520         interface_flush_state(iface);
 521         interface_clear_errors(iface);
 522         interface_set_proto_state(iface, NULL);
 523
 524         interface_set_main_dev(iface, NULL);
 525         interface_set_l3_dev(iface, NULL);
 526 }
 527
 528 static void
 529 interface_cleanup(struct interface *iface)
 530 {
 531         struct interface_user *dep, *tmp;
 532
 533         uloop_timeout_cancel(&iface->remove_timer);
 534         device_remove_user(&iface->ext_dev);
 535
 536         if (iface->parent_iface.iface)
 537                 interface_remove_user(&iface->parent_iface);
 538
 539         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 540                 interface_remove_user(dep);
 541
 542         interface_clear_assignment_classes(iface);
 543         interface_ip_flush(&iface->config_ip);
 544         interface_cleanup_state(iface);
 545 }
 546
 547 static void
 548 interface_do_free(struct interface *iface)
 549 {
 550         interface_event(iface, IFEV_FREE);
 551         interface_cleanup(iface);
 552         free(iface->config);
 553         netifd_ubus_remove_interface(iface);
 554         avl_delete(&interfaces.avl, &iface->node.avl);
 555         free(iface);
 556 }
 557
 558 static void
 559 interface_do_reload(struct interface *iface)
 560 {
 561         interface_event(iface, IFEV_RELOAD);
 562         interface_cleanup_state(iface);
 563         proto_init_interface(iface, iface->config);
 564         interface_claim_device(iface);
 565 }
 566
 567 static void
 568 interface_handle_config_change(struct interface *iface)
 569 {
 570         enum interface_config_state state = iface->config_state;
 571
 572         iface->config_state = IFC_NORMAL;
 573         switch(state) {
 574         case IFC_NORMAL:
 575                 break;
 576         case IFC_RELOAD:
 577                 interface_do_reload(iface);
 578                 break;
 579         case IFC_REMOVE:
 580                 interface_do_free(iface);
 581                 return;
 582         }
 583         if (iface->autostart && iface->available)
 584                 interface_set_up(iface);
 585 }
 586
 587 static void
 588 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 589 {
 590         struct interface *iface = state->iface;
 591
 592         switch (ev) {
 593         case IFPEV_UP:
 594                 if (iface->state != IFS_SETUP) {
 595                         interface_event(iface, IFEV_UPDATE);
 596                         return;
 597                 }
 598
 599                 if (!iface->l3_dev.dev)
 600                         interface_set_l3_dev(iface, iface->main_dev.dev);
 601
 602                 interface_ip_set_enabled(&iface->config_ip, true);
 603                 system_flush_routes();
 604                 iface->state = IFS_UP;
 605                 iface->start_time = system_get_rtime();
 606                 interface_event(iface, IFEV_UP);
 607                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 608                 break;
 609         case IFPEV_DOWN:
 610                 if (iface->state == IFS_DOWN)
 611                         return;
 612
 613                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 614                 mark_interface_down(iface);
 615                 if (iface->main_dev.dev)
 616                         device_release(&iface->main_dev);
 617                 if (iface->l3_dev.dev)
 618                         device_remove_user(&iface->l3_dev);
 619                 interface_handle_config_change(iface);
 620                 break;
 621         case IFPEV_LINK_LOST:
 622                 if (iface->state != IFS_UP)
 623                         return;
 624
 625                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 626                 mark_interface_down(iface);
 627                 iface->state = IFS_SETUP;
 628                 break;
 629         default:
 630                 return;
 631         }
 632
 633         interface_write_resolv_conf();
 634 }
 635
 636 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 637 {
 638         if (iface->proto) {
 639                 iface->proto->free(iface->proto);
 640                 iface->proto = NULL;
 641         }
 642         iface->state = IFS_DOWN;
 643         iface->proto = state;
 644         if (!state)
 645                 return;
 646
 647         state->proto_event = interface_proto_cb;
 648         state->iface = iface;
 649 }
 650
 651 struct interface *
 652 interface_alloc(const char *name, struct blob_attr *config)
 653 {
 654         struct interface *iface;
 655         struct blob_attr *tb[IFACE_ATTR_MAX];
 656         struct blob_attr *cur;
 657         const char *proto_name = NULL;
 658         char *iface_name;
 659         bool force_link = false;
 660
 661         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 662         iface->name = strcpy(iface_name, name);
 663         INIT_LIST_HEAD(&iface->errors);
 664         INIT_LIST_HEAD(&iface->users);
 665         INIT_LIST_HEAD(&iface->hotplug_list);
 666         INIT_LIST_HEAD(&iface->assignment_classes);
 667         interface_ip_init(iface);
 668         avl_init(&iface->data, avl_strcmp, false, NULL);
 669         iface->config_ip.enabled = false;
 670
 671         iface->main_dev.cb = interface_cb;
 672         iface->ext_dev.cb = interface_ext_cb;
 673
 674         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 675                       blob_data(config), blob_len(config));
 676
 677         if ((cur = tb[IFACE_ATTR_PROTO]))
 678                 proto_name = blobmsg_data(cur);
 679
 680         proto_attach_interface(iface, proto_name);
 681         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 682                 force_link = true;
 683
 684         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 685         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 686         iface->proto_ip.no_defaultroute =
 687                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 688         iface->proto_ip.no_dns =
 689                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 690
 691         if ((cur = tb[IFACE_ATTR_DNS]))
 692                 interface_add_dns_server_list(&iface->config_ip, cur);
 693
 694         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 695                 interface_add_dns_search_list(&iface->config_ip, cur);
 696
 697         if ((cur = tb[IFACE_ATTR_METRIC]))
 698                 iface->metric = blobmsg_get_u32(cur);
 699
 700         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 701                 iface->assignment_length = blobmsg_get_u32(cur);
 702
 703         iface->assignment_hint = -1;
 704         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 705                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 706                                 ~((1 << (64 - iface->assignment_length)) - 1);
 707
 708         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 709                 interface_add_assignment_classes(iface, cur);
 710
 711
 712         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 713                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 714                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 715         }
 716
 717         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 718                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 719                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 720         }
 721
 722         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 723
 724         iface->config_autostart = iface->autostart;
 725         return iface;
 726 }
 727
 728 void interface_set_dynamic(struct interface *iface)
 729 {
 730         iface->dynamic = true;
 731         iface->autostart = true;
 732         iface->node.version = -1; // Don't delete on reload
 733 }
 734
 735 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 736 {
 737         struct blob_attr *tb[IFACE_ATTR_MAX];
 738         struct blob_attr *cur;
 739
 740         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 741                       blob_data(config), blob_len(config));
 742
 743         if (alias) {
 744                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 745                         iface->parent_ifname = blobmsg_data(cur);
 746
 747                 if (!iface->parent_ifname)
 748                         return false;
 749         } else {
 750                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 751                         iface->ifname = blobmsg_data(cur);
 752         }
 753
 754
 755         iface->config = config;
 756         vlist_add(&interfaces, &iface->node, iface->name);
 757         return true;
 758 }
 759
 760 void
 761 interface_add(struct interface *iface, struct blob_attr *config)
 762 {
 763         __interface_add(iface, config, false);
 764 }
 765
 766 bool
 767 interface_add_alias(struct interface *iface, struct blob_attr *config)
 768 {
 769         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 770                 return false;
 771
 772         return __interface_add(iface, config, true);
 773 }
 774
 775 void
 776 interface_set_l3_dev(struct interface *iface, struct device *dev)
 777 {
 778         bool enabled = iface->config_ip.enabled;
 779         bool claimed = iface->l3_dev.claimed;
 780
 781         if (iface->l3_dev.dev == dev)
 782                 return;
 783
 784         interface_ip_set_enabled(&iface->config_ip, false);
 785         interface_ip_flush(&iface->proto_ip);
 786         device_add_user(&iface->l3_dev, dev);
 787
 788         if (dev) {
 789                 if (claimed) {
 790                         if (device_claim(&iface->l3_dev) < 0)
 791                                 return;
 792                 }
 793                 interface_ip_set_enabled(&iface->config_ip, enabled);
 794         }
 795 }
 796
 797 void
 798 interface_set_main_dev(struct interface *iface, struct device *dev)
 799 {
 800         bool claimed = iface->l3_dev.claimed;
 801
 802         if (iface->main_dev.dev == dev)
 803                 return;
 804
 805         interface_set_available(iface, false);
 806         device_add_user(&iface->main_dev, dev);
 807         if (!dev) {
 808                 interface_set_link_state(iface, false);
 809                 return;
 810         }
 811
 812         if (claimed) {
 813                 if (device_claim(&iface->l3_dev) < 0)
 814                         return;
 815         }
 816
 817         if (!iface->l3_dev.dev)
 818                 interface_set_l3_dev(iface, dev);
 819 }
 820
 821 int
 822 interface_remove_link(struct interface *iface, struct device *dev)
 823 {
 824         struct device *mdev = iface->main_dev.dev;
 825
 826         if (mdev && mdev->hotplug_ops)
 827                 return mdev->hotplug_ops->del(mdev, dev);
 828
 829         if (dev == iface->ext_dev.dev)
 830                 device_remove_user(&iface->ext_dev);
 831
 832         if (!iface->main_dev.hotplug)
 833                 return UBUS_STATUS_INVALID_ARGUMENT;
 834
 835         if (dev != iface->main_dev.dev)
 836                 return UBUS_STATUS_INVALID_ARGUMENT;
 837
 838         interface_set_main_dev(iface, NULL);
 839         return 0;
 840 }
 841
 842 static int
 843 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 844 {
 845         struct device *mdev = iface->main_dev.dev;
 846
 847         if (mdev == dev)
 848                 return 0;
 849
 850         if (iface->main_dev.hotplug)
 851                 device_remove_user(&iface->main_dev);
 852
 853         if (mdev) {
 854                 if (mdev->hotplug_ops)
 855                         return mdev->hotplug_ops->add(mdev, dev);
 856                 else
 857                         return UBUS_STATUS_NOT_SUPPORTED;
 858         }
 859
 860         if (link_ext)
 861                 device_add_user(&iface->ext_dev, dev);
 862
 863         interface_set_main_dev(iface, dev);
 864         iface->main_dev.hotplug = true;
 865         return 0;
 866 }
 867
 868 int
 869 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 870 {
 871         struct device *dev;
 872         int ret;
 873
 874         device_lock();
 875
 876         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 877         if (!dev) {
 878                 ret = UBUS_STATUS_NOT_FOUND;
 879                 goto out;
 880         }
 881
 882         if (add) {
 883                 device_set_present(dev, true);
 884                 if (iface->device_config)
 885                         device_set_config(dev, &simple_device_type, iface->config);
 886
 887                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 888                 ret = interface_add_link(iface, dev, link_ext);
 889         } else {
 890                 ret = interface_remove_link(iface, dev);
 891         }
 892
 893 out:
 894         device_unlock();
 895
 896         return ret;
 897 }
 898
 899 int
 900 interface_set_up(struct interface *iface)
 901 {
 902         int ret;
 903
 904         iface->autostart = true;
 905
 906         if (iface->state != IFS_DOWN)
 907                 return 0;
 908
 909         interface_clear_errors(iface);
 910         if (!iface->available) {
 911                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 912                 return -1;
 913         }
 914
 915         if (iface->main_dev.dev) {
 916                 ret = device_claim(&iface->main_dev);
 917                 if (!ret)
 918                         interface_check_state(iface);
 919         }
 920         else
 921                 ret = __interface_set_up(iface);
 922
 923         return ret;
 924 }
 925
 926 int
 927 interface_set_down(struct interface *iface)
 928 {
 929         if (!iface) {
 930                 vlist_for_each_element(&interfaces, iface, node)
 931                         __interface_set_down(iface, false);
 932         } else {
 933                 iface->autostart = false;
 934                 __interface_set_down(iface, false);
 935         }
 936
 937         return 0;
 938 }
 939
 940 void
 941 interface_start_pending(void)
 942 {
 943         struct interface *iface;
 944
 945         vlist_for_each_element(&interfaces, iface, node) {
 946                 if (iface->available && iface->autostart)
 947                         interface_set_up(iface);
 948         }
 949 }
 950
 951 static void
 952 set_config_state(struct interface *iface, enum interface_config_state s)
 953 {
 954         iface->config_state = s;
 955         if (iface->state == IFS_DOWN)
 956                 interface_handle_config_change(iface);
 957         else
 958                 __interface_set_down(iface, false);
 959 }
 960
 961 void
 962 interface_update_start(struct interface *iface)
 963 {
 964         iface->updated = 0;
 965         interface_ip_update_start(&iface->proto_ip);
 966 }
 967
 968 void
 969 interface_update_complete(struct interface *iface)
 970 {
 971         interface_ip_update_complete(&iface->proto_ip);
 972 }
 973
 974 static void
 975 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 976 {
 977         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 978         vlist_simple_replace(&new->dns_search, &old->dns_search);
 979 }
 980
 981 static void
 982 interface_change_config(struct interface *if_old, struct interface *if_new)
 983 {
 984         struct blob_attr *old_config = if_old->config;
 985         bool reload = false, reload_ip = false;
 986
 987 #define FIELD_CHANGED_STR(field)                                        \
 988                 ((!!if_old->field != !!if_new->field) ||                \
 989                  (if_old->field &&                                      \
 990                   strcmp(if_old->field, if_new->field) != 0))
 991
 992         if (FIELD_CHANGED_STR(parent_ifname)) {
 993                 if (if_old->parent_iface.iface)
 994                         interface_remove_user(&if_old->parent_iface);
 995                 reload = true;
 996         }
 997
 998         if (FIELD_CHANGED_STR(ifname) ||
 999             if_old->proto_handler != if_new->proto_handler)
1000                 reload = true;
1001
1002         if (!if_old->proto_handler->config_params)
1003                 D(INTERFACE, "No config parameters for interface '%s'\n",
1004                   if_old->name);
1005         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1006                                        if_old->proto_handler->config_params))
1007                 reload = true;
1008
1009 #define UPDATE(field, __var) ({                                         \
1010                 bool __changed = (if_old->field != if_new->field);      \
1011                 if_old->field = if_new->field;                          \
1012                 __var |= __changed;                                     \
1013         })
1014
1015         if_old->config = if_new->config;
1016         if (!if_old->config_autostart && if_new->config_autostart)
1017                 if_old->autostart = true;
1018
1019         if_old->device_config = if_new->device_config;
1020         if_old->config_autostart = if_new->config_autostart;
1021         if_old->ifname = if_new->ifname;
1022         if_old->parent_ifname = if_new->parent_ifname;
1023         if_old->proto_handler = if_new->proto_handler;
1024         if_old->force_link = if_new->force_link;
1025
1026         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1027         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1028
1029         UPDATE(metric, reload_ip);
1030         UPDATE(proto_ip.no_defaultroute, reload_ip);
1031         UPDATE(ip4table, reload_ip);
1032         UPDATE(ip6table, reload_ip);
1033         interface_merge_assignment_data(if_old, if_new);
1034
1035 #undef UPDATE
1036
1037         if (reload) {
1038                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1039                   if_old->name);
1040                 interface_clear_errors(if_old);
1041                 set_config_state(if_old, IFC_RELOAD);
1042                 goto out;
1043         }
1044
1045         if (reload_ip) {
1046                 interface_ip_set_enabled(&if_old->config_ip, false);
1047                 interface_ip_set_enabled(&if_old->proto_ip, false);
1048                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1049                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1050         }
1051
1052         interface_write_resolv_conf();
1053         if (if_old->main_dev.dev)
1054                 interface_check_state(if_old);
1055
1056 out:
1057         if_new->config = NULL;
1058         interface_cleanup(if_new);
1059         free(old_config);
1060         free(if_new);
1061 }
1062
1063 static void
1064 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1065                  struct vlist_node *node_old)
1066 {
1067         struct interface *if_old = container_of(node_old, struct interface, node);
1068         struct interface *if_new = container_of(node_new, struct interface, node);
1069
1070         if (node_old && node_new) {
1071                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1072                 interface_change_config(if_old, if_new);
1073         } else if (node_old) {
1074                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1075                 set_config_state(if_old, IFC_REMOVE);
1076         } else if (node_new) {
1077                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1078                 proto_init_interface(if_new, if_new->config);
1079                 interface_claim_device(if_new);
1080                 netifd_ubus_add_interface(if_new);
1081         }
1082 }
1083
1084
1085 static void __init
1086 interface_init_list(void)
1087 {
1088         vlist_init(&interfaces, avl_strcmp, interface_update);
1089         interfaces.keep_old = true;
1090         interfaces.no_delete = true;
1091 }