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_IP6IFACEID,
  47         IFACE_ATTR_FORCE_LINK,
  48         IFACE_ATTR_MAX
  49 };
  50
  51 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  52         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  54         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  58         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  60         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  69 };
  70
  71 const struct uci_blob_param_list interface_attr_list = {
  72         .n_params = IFACE_ATTR_MAX,
  73         .params = iface_attrs,
  74 };
  75
  76 static void
  77 set_config_state(struct interface *iface, enum interface_config_state s);
  78 static void
  79 interface_event(struct interface *iface, enum interface_event ev);
  80
  81 static void
  82 interface_error_flush(struct interface *iface)
  83 {
  84         struct interface_error *error, *tmp;
  85
  86         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  87                 list_del(&error->list);
  88                 free(error);
  89         }
  90 }
  91
  92 static void
  93 interface_clear_errors(struct interface *iface)
  94 {
  95         /* don't flush the errors in case the configured protocol handler matches the
  96            running protocol handler and is having the last error capability */
  97         if (!(iface->proto &&
  98               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
  99               (iface->proto->handler->name == iface->proto_handler->name)))
 100                 interface_error_flush(iface);
 101 }
 102
 103 void interface_add_error(struct interface *iface, const char *subsystem,
 104                          const char *code, const char **data, int n_data)
 105 {
 106         struct interface_error *error;
 107         int i, len = 0;
 108         int *datalen = NULL;
 109         char *dest, *d_subsys, *d_code;
 110
 111         /* if the configured protocol handler has the last error support capability,
 112            errors should only be added if the running protocol handler matches the
 113            configured one */
 114         if (iface->proto &&
 115             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 116             (iface->proto->handler->name != iface->proto_handler->name))
 117                 return;
 118
 119         if (n_data) {
 120                 len = n_data * sizeof(char *);
 121                 datalen = alloca(len);
 122                 for (i = 0; i < n_data; i++) {
 123                         datalen[i] = strlen(data[i]) + 1;
 124                         len += datalen[i];
 125                 }
 126         }
 127
 128         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 129                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 130                 &d_code, code ? strlen(code) + 1 : 0);
 131         if (!error)
 132                 return;
 133
 134         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 135            protocol can't be established (e.g auth failure) */
 136         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 137                 interface_error_flush(iface);
 138
 139         list_add_tail(&error->list, &iface->errors);
 140
 141         dest = (char *) &error->data[n_data + 1];
 142         for (i = 0; i < n_data; i++) {
 143                 error->data[i] = dest;
 144                 memcpy(dest, data[i], datalen[i]);
 145                 dest += datalen[i];
 146         }
 147         error->data[n_data] = NULL;
 148
 149         if (subsystem)
 150                 error->subsystem = strcpy(d_subsys, subsystem);
 151
 152         if (code)
 153                 error->code = strcpy(d_code, code);
 154 }
 155
 156 static void
 157 interface_data_del(struct interface *iface, struct interface_data *data)
 158 {
 159         avl_delete(&iface->data, &data->node);
 160         free(data);
 161 }
 162
 163 static void
 164 interface_data_flush(struct interface *iface)
 165 {
 166         struct interface_data *d, *tmp;
 167
 168         avl_for_each_element_safe(&iface->data, d, node, tmp)
 169                 interface_data_del(iface, d);
 170 }
 171
 172 int
 173 interface_add_data(struct interface *iface, const struct blob_attr *data)
 174 {
 175         struct interface_data *n, *o;
 176
 177         if (!blobmsg_check_attr(data, true))
 178                 return UBUS_STATUS_INVALID_ARGUMENT;
 179
 180         const char *name = blobmsg_name(data);
 181         unsigned len = blob_pad_len(data);
 182
 183         o = avl_find_element(&iface->data, name, o, node);
 184         if (o) {
 185                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 186                         return 0;
 187
 188                 interface_data_del(iface, o);
 189         }
 190
 191         n = calloc(1, sizeof(*n) + len);
 192         if (!n)
 193                 return UBUS_STATUS_UNKNOWN_ERROR;
 194
 195         memcpy(n->data, data, len);
 196         n->node.key = blobmsg_name(n->data);
 197         avl_insert(&iface->data, &n->node);
 198
 199         iface->updated |= IUF_DATA;
 200         return 0;
 201 }
 202
 203 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 204 {
 205         struct blob_attr *cur;
 206         int rem, ret;
 207
 208         iface->updated = 0;
 209
 210         blob_for_each_attr(cur, attr, rem) {
 211                 ret = interface_add_data(iface, cur);
 212                 if (ret)
 213                         return ret;
 214         }
 215
 216         if (iface->updated && iface->state == IFS_UP)
 217                 interface_event(iface, IFEV_UPDATE);
 218
 219         return 0;
 220 }
 221
 222 static void
 223 interface_event(struct interface *iface, enum interface_event ev)
 224 {
 225         struct interface_user *dep, *tmp;
 226         struct device *adev = NULL;
 227
 228         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 229                 dep->cb(dep, iface, ev);
 230
 231         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 232                 dep->cb(dep, iface, ev);
 233
 234         switch (ev) {
 235         case IFEV_UP:
 236                 interface_error_flush(iface);
 237                 adev = iface->l3_dev.dev;
 238                 /* fall through */
 239         case IFEV_DOWN:
 240                 alias_notify_device(iface->name, adev);
 241                 break;
 242         default:
 243                 break;
 244         }
 245 }
 246
 247 static void
 248 interface_flush_state(struct interface *iface)
 249 {
 250         if (iface->l3_dev.dev)
 251                 device_release(&iface->l3_dev);
 252         interface_data_flush(iface);
 253 }
 254
 255 static void
 256 mark_interface_down(struct interface *iface)
 257 {
 258         enum interface_state state = iface->state;
 259
 260         if (state == IFS_DOWN)
 261                 return;
 262
 263         iface->link_up_event = false;
 264         iface->state = IFS_DOWN;
 265         if (state == IFS_UP)
 266                 interface_event(iface, IFEV_DOWN);
 267         interface_ip_set_enabled(&iface->config_ip, false);
 268         interface_ip_set_enabled(&iface->proto_ip, false);
 269         interface_ip_flush(&iface->proto_ip);
 270         interface_flush_state(iface);
 271         system_flush_routes();
 272 }
 273
 274 void
 275 __interface_set_down(struct interface *iface, bool force)
 276 {
 277         enum interface_state state = iface->state;
 278         switch (state) {
 279         case IFS_UP:
 280         case IFS_SETUP:
 281                 iface->state = IFS_TEARDOWN;
 282                 if (state == IFS_UP)
 283                         interface_event(iface, IFEV_DOWN);
 284
 285                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 286                 if (force)
 287                         interface_flush_state(iface);
 288                 break;
 289
 290         case IFS_DOWN:
 291                 if (iface->main_dev.dev)
 292                         device_release(&iface->main_dev);
 293         case IFS_TEARDOWN:
 294         default:
 295                 break;
 296         }
 297 }
 298
 299 static int
 300 __interface_set_up(struct interface *iface)
 301 {
 302         int ret;
 303
 304         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 305
 306         iface->state = IFS_SETUP;
 307         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 308         if (ret)
 309                 mark_interface_down(iface);
 310
 311         return ret;
 312 }
 313
 314 static void
 315 interface_check_state(struct interface *iface)
 316 {
 317         bool link_state = iface->link_state || iface->force_link;
 318
 319         switch (iface->state) {
 320         case IFS_UP:
 321         case IFS_SETUP:
 322                 if (!iface->enabled || !link_state) {
 323                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 324                         mark_interface_down(iface);
 325                 }
 326                 break;
 327         case IFS_DOWN:
 328                 if (!iface->available)
 329                         return;
 330
 331                 if (iface->autostart && iface->enabled && link_state && !config_init)
 332                         __interface_set_up(iface);
 333                 break;
 334         default:
 335                 break;
 336         }
 337 }
 338
 339 static void
 340 interface_set_enabled(struct interface *iface, bool new_state)
 341 {
 342         if (iface->enabled == new_state)
 343                 return;
 344
 345         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 346         iface->enabled = new_state;
 347         interface_check_state(iface);
 348 }
 349
 350 static void
 351 interface_set_link_state(struct interface *iface, bool new_state)
 352 {
 353         if (iface->link_state == new_state)
 354                 return;
 355
 356         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 357         iface->link_state = new_state;
 358         interface_check_state(iface);
 359
 360         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 361                 interface_event(iface, IFEV_LINK_UP);
 362                 iface->link_up_event = true;
 363         }
 364 }
 365
 366 static void
 367 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 368 {
 369         if (ev == DEV_EVENT_REMOVE)
 370                 device_remove_user(dep);
 371 }
 372
 373 static void
 374 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 375 {
 376         struct interface *iface;
 377         bool new_state = false;
 378
 379         iface = container_of(dep, struct interface, main_dev);
 380         switch (ev) {
 381         case DEV_EVENT_ADD:
 382                 new_state = true;
 383         case DEV_EVENT_REMOVE:
 384                 interface_set_available(iface, new_state);
 385                 if (!new_state && dep->dev && dep->dev->external)
 386                         interface_set_main_dev(iface, NULL);
 387                 break;
 388         case DEV_EVENT_UP:
 389                 new_state = true;
 390         case DEV_EVENT_DOWN:
 391                 interface_set_enabled(iface, new_state);
 392                 break;
 393         case DEV_EVENT_LINK_UP:
 394                 new_state = true;
 395         case DEV_EVENT_LINK_DOWN:
 396                 interface_set_link_state(iface, new_state);
 397                 break;
 398         case DEV_EVENT_TOPO_CHANGE:
 399                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 400                 return;
 401         default:
 402                 break;
 403         }
 404 }
 405
 406 static void
 407 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 408 {
 409         struct interface *iface;
 410
 411         iface = container_of(dep, struct interface, l3_dev);
 412         if (iface->l3_dev.dev == iface->main_dev.dev)
 413                 return;
 414
 415         switch (ev) {
 416         case DEV_EVENT_LINK_DOWN:
 417                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 418                 break;
 419         default:
 420                 break;
 421         }
 422 }
 423
 424 void
 425 interface_set_available(struct interface *iface, bool new_state)
 426 {
 427         if (iface->available == new_state)
 428                 return;
 429
 430         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 431         iface->available = new_state;
 432
 433         if (new_state) {
 434                 if (iface->autostart && !config_init)
 435                         interface_set_up(iface);
 436         } else
 437                 __interface_set_down(iface, true);
 438 }
 439
 440 void
 441 interface_add_user(struct interface_user *dep, struct interface *iface)
 442 {
 443         if (!iface) {
 444                 list_add(&dep->list, &iface_all_users);
 445                 return;
 446         }
 447
 448         dep->iface = iface;
 449         list_add(&dep->list, &iface->users);
 450         if (iface->state == IFS_UP)
 451                 dep->cb(dep, iface, IFEV_UP);
 452 }
 453
 454 void
 455 interface_remove_user(struct interface_user *dep)
 456 {
 457         list_del_init(&dep->list);
 458         dep->iface = NULL;
 459 }
 460
 461 static void
 462 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 463 {
 464         struct blob_attr *cur;
 465         int rem;
 466
 467         blobmsg_for_each_attr(cur, list, rem) {
 468                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 469                         continue;
 470
 471                 if (!blobmsg_check_attr(cur, NULL))
 472                         continue;
 473
 474                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 475                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 476                 list_add(&c->head, &iface->assignment_classes);
 477         }
 478 }
 479
 480 static void
 481 interface_clear_assignment_classes(struct interface *iface)
 482 {
 483         while (!list_empty(&iface->assignment_classes)) {
 484                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 485                                 struct interface_assignment_class, head);
 486                 list_del(&c->head);
 487                 free(c);
 488         }
 489 }
 490
 491 static void
 492 interface_merge_assignment_data(struct interface *old, struct interface *new)
 493 {
 494         bool changed = (old->assignment_hint != new->assignment_hint ||
 495                         old->assignment_length != new->assignment_length ||
 496                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 497                         (old->assignment_iface_id_selection == IFID_FIXED &&
 498                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 499                                 sizeof(old->assignment_fixed_iface_id))) ||
 500                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 501
 502         struct interface_assignment_class *c;
 503         list_for_each_entry(c, &new->assignment_classes, head) {
 504                 // Compare list entries one-by-one to see if there was a change
 505                 if (list_empty(&old->assignment_classes)) // The new list is longer
 506                         changed = true;
 507
 508                 if (changed)
 509                         break;
 510
 511                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 512                                 struct interface_assignment_class, head);
 513
 514                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 515                         break;
 516
 517                 list_del(&c_old->head);
 518                 free(c_old);
 519         }
 520
 521         // The old list was longer than the new one or the last entry didn't match
 522         if (!list_empty(&old->assignment_classes)) {
 523                 interface_clear_assignment_classes(old);
 524                 changed = true;
 525         }
 526
 527         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 528
 529         if (changed) {
 530                 old->assignment_hint = new->assignment_hint;
 531                 old->assignment_length = new->assignment_length;
 532                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 533                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 534                 interface_refresh_assignments(true);
 535         }
 536 }
 537
 538 static void
 539 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 540 {
 541         struct interface *alias = container_of(dep, struct interface, parent_iface);
 542         struct device *dev = iface->l3_dev.dev;
 543
 544         switch (ev) {
 545         case IFEV_UP:
 546                 if (!dev)
 547                         return;
 548
 549                 interface_set_main_dev(alias, dev);
 550                 interface_set_available(alias, true);
 551                 break;
 552         case IFEV_DOWN:
 553                 interface_set_available(alias, false);
 554                 interface_set_main_dev(alias, NULL);
 555                 break;
 556         case IFEV_FREE:
 557                 interface_remove_user(dep);
 558                 break;
 559         default:
 560                 break;
 561         }
 562 }
 563
 564 static void
 565 interface_set_device_config(struct interface *iface, struct device *dev)
 566 {
 567         if (!dev || !dev->default_config)
 568                 return;
 569
 570         if (!iface->device_config &&
 571             (!dev->iface_config || dev->config_iface != iface))
 572                 return;
 573
 574         dev->config_iface = iface;
 575         dev->iface_config = iface->device_config;
 576         device_apply_config(dev, dev->type, iface->config);
 577 }
 578
 579 static void
 580 interface_claim_device(struct interface *iface)
 581 {
 582         struct interface *parent;
 583         struct device *dev = NULL;
 584
 585         if (iface->parent_iface.iface)
 586                 interface_remove_user(&iface->parent_iface);
 587
 588         if (iface->parent_ifname) {
 589                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 590                 iface->parent_iface.cb = interface_alias_cb;
 591                 interface_add_user(&iface->parent_iface, parent);
 592         } else if (iface->ifname &&
 593                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 594                 dev = device_get(iface->ifname, true);
 595                 interface_set_device_config(iface, dev);
 596         } else {
 597                 dev = iface->ext_dev.dev;
 598         }
 599
 600         if (dev)
 601                 interface_set_main_dev(iface, dev);
 602
 603         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 604                 interface_set_available(iface, true);
 605 }
 606
 607 static void
 608 interface_cleanup_state(struct interface *iface)
 609 {
 610         interface_set_available(iface, false);
 611
 612         interface_flush_state(iface);
 613         interface_clear_errors(iface);
 614         interface_set_proto_state(iface, NULL);
 615
 616         interface_set_main_dev(iface, NULL);
 617         interface_set_l3_dev(iface, NULL);
 618 }
 619
 620 static void
 621 interface_cleanup(struct interface *iface)
 622 {
 623         struct interface_user *dep, *tmp;
 624
 625         uloop_timeout_cancel(&iface->remove_timer);
 626         device_remove_user(&iface->ext_dev);
 627
 628         if (iface->parent_iface.iface)
 629                 interface_remove_user(&iface->parent_iface);
 630
 631         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 632                 interface_remove_user(dep);
 633
 634         interface_clear_assignment_classes(iface);
 635         interface_ip_flush(&iface->config_ip);
 636         interface_cleanup_state(iface);
 637 }
 638
 639 static void
 640 interface_do_free(struct interface *iface)
 641 {
 642         interface_event(iface, IFEV_FREE);
 643         interface_cleanup(iface);
 644         free(iface->config);
 645         netifd_ubus_remove_interface(iface);
 646         avl_delete(&interfaces.avl, &iface->node.avl);
 647         free(iface);
 648 }
 649
 650 static void
 651 interface_do_reload(struct interface *iface)
 652 {
 653         interface_event(iface, IFEV_RELOAD);
 654         interface_cleanup_state(iface);
 655         proto_init_interface(iface, iface->config);
 656         interface_claim_device(iface);
 657 }
 658
 659 static void
 660 interface_handle_config_change(struct interface *iface)
 661 {
 662         enum interface_config_state state = iface->config_state;
 663
 664         iface->config_state = IFC_NORMAL;
 665         switch(state) {
 666         case IFC_NORMAL:
 667                 break;
 668         case IFC_RELOAD:
 669                 interface_do_reload(iface);
 670                 break;
 671         case IFC_REMOVE:
 672                 interface_do_free(iface);
 673                 return;
 674         }
 675         if (iface->autostart && iface->available)
 676                 interface_set_up(iface);
 677         else if (iface->dynamic)
 678                 set_config_state(iface, IFC_REMOVE);
 679 }
 680
 681 static void
 682 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 683 {
 684         struct interface *iface = state->iface;
 685
 686         switch (ev) {
 687         case IFPEV_UP:
 688                 if (iface->state != IFS_SETUP) {
 689                         interface_event(iface, IFEV_UPDATE);
 690                         return;
 691                 }
 692
 693                 if (!iface->l3_dev.dev)
 694                         interface_set_l3_dev(iface, iface->main_dev.dev);
 695
 696                 interface_ip_set_enabled(&iface->config_ip, true);
 697                 interface_ip_set_enabled(&iface->proto_ip, true);
 698                 system_flush_routes();
 699                 iface->state = IFS_UP;
 700                 iface->start_time = system_get_rtime();
 701                 interface_event(iface, IFEV_UP);
 702                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 703                 break;
 704         case IFPEV_DOWN:
 705                 if (iface->state == IFS_DOWN)
 706                         return;
 707
 708                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 709                 mark_interface_down(iface);
 710                 if (iface->main_dev.dev)
 711                         device_release(&iface->main_dev);
 712                 if (iface->l3_dev.dev)
 713                         device_remove_user(&iface->l3_dev);
 714                 interface_handle_config_change(iface);
 715                 break;
 716         case IFPEV_LINK_LOST:
 717                 if (iface->state != IFS_UP)
 718                         return;
 719
 720                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 721                 mark_interface_down(iface);
 722                 iface->state = IFS_SETUP;
 723                 break;
 724         default:
 725                 return;
 726         }
 727
 728         interface_write_resolv_conf();
 729 }
 730
 731 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 732 {
 733         if (iface->proto) {
 734                 iface->proto->free(iface->proto);
 735                 iface->proto = NULL;
 736         }
 737         iface->state = IFS_DOWN;
 738         iface->proto = state;
 739         if (!state)
 740                 return;
 741
 742         state->proto_event = interface_proto_event_cb;
 743         state->iface = iface;
 744 }
 745
 746 struct interface *
 747 interface_alloc(const char *name, struct blob_attr *config)
 748 {
 749         struct interface *iface;
 750         struct blob_attr *tb[IFACE_ATTR_MAX];
 751         struct blob_attr *cur;
 752         const char *proto_name = NULL;
 753         char *iface_name;
 754         bool force_link = false;
 755
 756         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 757         iface->name = strcpy(iface_name, name);
 758         INIT_LIST_HEAD(&iface->errors);
 759         INIT_LIST_HEAD(&iface->users);
 760         INIT_LIST_HEAD(&iface->hotplug_list);
 761         INIT_LIST_HEAD(&iface->assignment_classes);
 762         interface_ip_init(iface);
 763         avl_init(&iface->data, avl_strcmp, false, NULL);
 764         iface->config_ip.enabled = false;
 765
 766         iface->main_dev.cb = interface_main_dev_cb;
 767         iface->l3_dev.cb = interface_l3_dev_cb;
 768         iface->ext_dev.cb = interface_ext_dev_cb;
 769
 770         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 771                       blob_data(config), blob_len(config));
 772
 773         if ((cur = tb[IFACE_ATTR_PROTO]))
 774                 proto_name = blobmsg_data(cur);
 775
 776         proto_attach_interface(iface, proto_name);
 777         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 778                 force_link = true;
 779
 780         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 781         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 782         iface->proto_ip.no_defaultroute =
 783                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 784         iface->proto_ip.no_dns =
 785                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 786
 787         if ((cur = tb[IFACE_ATTR_DNS]))
 788                 interface_add_dns_server_list(&iface->config_ip, cur);
 789
 790         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 791                 interface_add_dns_search_list(&iface->config_ip, cur);
 792
 793         if ((cur = tb[IFACE_ATTR_METRIC]))
 794                 iface->metric = blobmsg_get_u32(cur);
 795
 796         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 797                 iface->assignment_length = blobmsg_get_u32(cur);
 798
 799         /* defaults */
 800         iface->assignment_iface_id_selection = IFID_FIXED;
 801         iface->assignment_fixed_iface_id = in6addr_any;
 802         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 803
 804         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 805                 const char *ifaceid = blobmsg_data(cur);
 806                 if (!strcmp(ifaceid, "random")) {
 807                         iface->assignment_iface_id_selection = IFID_RANDOM;
 808                 }
 809                 else if (!strcmp(ifaceid, "eui64")) {
 810                         iface->assignment_iface_id_selection = IFID_EUI64;
 811                 }
 812                 else {
 813                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 814                            if we cannot parse -> revert to iface id 1 */
 815                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 816                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 817                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 818                                 iface->assignment_fixed_iface_id = in6addr_any;
 819                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 820                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 821                                                         falling back to iface id 1.\n", iface->name);
 822                         }
 823                 }
 824         }
 825
 826         iface->assignment_hint = -1;
 827         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 828                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 829                                 ~((1 << (64 - iface->assignment_length)) - 1);
 830
 831         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 832                 interface_add_assignment_classes(iface, cur);
 833
 834
 835         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 836                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 837                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 838         }
 839
 840         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 841                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 842                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 843         }
 844
 845         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 846
 847         iface->config_autostart = iface->autostart;
 848         return iface;
 849 }
 850
 851 void interface_set_dynamic(struct interface *iface)
 852 {
 853         iface->dynamic = true;
 854         iface->autostart = true;
 855         iface->node.version = -1; // Don't delete on reload
 856 }
 857
 858 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 859 {
 860         struct blob_attr *tb[IFACE_ATTR_MAX];
 861         struct blob_attr *cur;
 862
 863         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 864                       blob_data(config), blob_len(config));
 865
 866         if (alias) {
 867                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 868                         iface->parent_ifname = blobmsg_data(cur);
 869
 870                 if (!iface->parent_ifname)
 871                         return false;
 872         } else {
 873                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 874                         iface->ifname = blobmsg_data(cur);
 875         }
 876
 877         iface->config = config;
 878         vlist_add(&interfaces, &iface->node, iface->name);
 879         return true;
 880 }
 881
 882 void
 883 interface_add(struct interface *iface, struct blob_attr *config)
 884 {
 885         __interface_add(iface, config, false);
 886 }
 887
 888 bool
 889 interface_add_alias(struct interface *iface, struct blob_attr *config)
 890 {
 891         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 892                 return false;
 893
 894         return __interface_add(iface, config, true);
 895 }
 896
 897 void
 898 interface_set_l3_dev(struct interface *iface, struct device *dev)
 899 {
 900         bool enabled = iface->config_ip.enabled;
 901         bool claimed = iface->l3_dev.claimed;
 902
 903         if (iface->l3_dev.dev == dev)
 904                 return;
 905
 906         interface_ip_set_enabled(&iface->config_ip, false);
 907         interface_ip_set_enabled(&iface->proto_ip, false);
 908         interface_ip_flush(&iface->proto_ip);
 909         device_add_user(&iface->l3_dev, dev);
 910
 911         if (dev) {
 912                 if (claimed) {
 913                         if (device_claim(&iface->l3_dev) < 0)
 914                                 return;
 915                 }
 916                 interface_ip_set_enabled(&iface->config_ip, enabled);
 917                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 918         }
 919 }
 920
 921 void
 922 interface_set_main_dev(struct interface *iface, struct device *dev)
 923 {
 924         bool claimed = iface->l3_dev.claimed;
 925
 926         if (iface->main_dev.dev == dev)
 927                 return;
 928
 929         interface_set_available(iface, false);
 930         device_add_user(&iface->main_dev, dev);
 931         if (!dev) {
 932                 interface_set_link_state(iface, false);
 933                 return;
 934         }
 935
 936         if (claimed) {
 937                 if (device_claim(&iface->l3_dev) < 0)
 938                         return;
 939         }
 940
 941         if (!iface->l3_dev.dev)
 942                 interface_set_l3_dev(iface, dev);
 943 }
 944
 945 int
 946 interface_remove_link(struct interface *iface, struct device *dev)
 947 {
 948         struct device *mdev = iface->main_dev.dev;
 949
 950         if (mdev && mdev->hotplug_ops)
 951                 return mdev->hotplug_ops->del(mdev, dev);
 952
 953         if (dev == iface->ext_dev.dev)
 954                 device_remove_user(&iface->ext_dev);
 955
 956         if (!iface->main_dev.hotplug)
 957                 return UBUS_STATUS_INVALID_ARGUMENT;
 958
 959         if (dev != iface->main_dev.dev)
 960                 return UBUS_STATUS_INVALID_ARGUMENT;
 961
 962         interface_set_main_dev(iface, NULL);
 963         return 0;
 964 }
 965
 966 static int
 967 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 968 {
 969         struct device *mdev = iface->main_dev.dev;
 970
 971         if (mdev == dev)
 972                 return 0;
 973
 974         if (iface->main_dev.hotplug)
 975                 device_remove_user(&iface->main_dev);
 976
 977         if (mdev) {
 978                 if (mdev->hotplug_ops)
 979                         return mdev->hotplug_ops->add(mdev, dev);
 980                 else
 981                         return UBUS_STATUS_NOT_SUPPORTED;
 982         }
 983
 984         if (link_ext)
 985                 device_add_user(&iface->ext_dev, dev);
 986
 987         interface_set_main_dev(iface, dev);
 988         iface->main_dev.hotplug = true;
 989         return 0;
 990 }
 991
 992 int
 993 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 994 {
 995         struct device *dev;
 996         int ret;
 997
 998         device_lock();
 999
1000         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1001         if (!dev) {
1002                 ret = UBUS_STATUS_NOT_FOUND;
1003                 goto out;
1004         }
1005
1006         if (add) {
1007                 interface_set_device_config(iface, dev);
1008                 device_set_present(dev, true);
1009
1010                 ret = interface_add_link(iface, dev, link_ext);
1011         } else {
1012                 ret = interface_remove_link(iface, dev);
1013         }
1014
1015 out:
1016         device_unlock();
1017
1018         return ret;
1019 }
1020
1021 int
1022 interface_set_up(struct interface *iface)
1023 {
1024         int ret;
1025
1026         iface->autostart = true;
1027
1028         if (iface->state != IFS_DOWN)
1029                 return 0;
1030
1031         interface_clear_errors(iface);
1032         if (!iface->available) {
1033                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1034                 return -1;
1035         }
1036
1037         if (iface->main_dev.dev) {
1038                 ret = device_claim(&iface->main_dev);
1039                 if (!ret)
1040                         interface_check_state(iface);
1041         }
1042         else
1043                 ret = __interface_set_up(iface);
1044
1045         return ret;
1046 }
1047
1048 int
1049 interface_set_down(struct interface *iface)
1050 {
1051         if (!iface) {
1052                 vlist_for_each_element(&interfaces, iface, node)
1053                         __interface_set_down(iface, false);
1054         } else {
1055                 iface->autostart = false;
1056                 __interface_set_down(iface, false);
1057         }
1058
1059         return 0;
1060 }
1061
1062 void
1063 interface_start_pending(void)
1064 {
1065         struct interface *iface;
1066
1067         vlist_for_each_element(&interfaces, iface, node) {
1068                 if (iface->available && iface->autostart)
1069                         interface_set_up(iface);
1070         }
1071 }
1072
1073 static void
1074 set_config_state(struct interface *iface, enum interface_config_state s)
1075 {
1076         iface->config_state = s;
1077         if (iface->state == IFS_DOWN)
1078                 interface_handle_config_change(iface);
1079         else
1080                 __interface_set_down(iface, false);
1081 }
1082
1083 void
1084 interface_update_start(struct interface *iface)
1085 {
1086         iface->updated = 0;
1087         interface_ip_update_start(&iface->proto_ip);
1088 }
1089
1090 void
1091 interface_update_complete(struct interface *iface)
1092 {
1093         interface_ip_update_complete(&iface->proto_ip);
1094 }
1095
1096 static void
1097 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1098 {
1099         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1100         vlist_simple_replace(&new->dns_search, &old->dns_search);
1101 }
1102
1103 static bool
1104 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1105 {
1106         struct blob_attr *ntb[__DEV_ATTR_MAX];
1107         struct blob_attr *otb[__DEV_ATTR_MAX];
1108         struct device *dev = if_old->main_dev.dev;
1109         unsigned long diff = 0;
1110
1111         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1112
1113         if (!dev)
1114                 return false;
1115
1116         if (if_old->device_config != if_new->device_config)
1117                 return true;
1118
1119         if (!if_new->device_config)
1120                 return false;
1121
1122         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1123                 blob_data(if_old->config), blob_len(if_old->config));
1124
1125         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1126                 blob_data(if_new->config), blob_len(if_new->config));
1127
1128         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1129         return diff;
1130 }
1131
1132 static void
1133 interface_change_config(struct interface *if_old, struct interface *if_new)
1134 {
1135         struct blob_attr *old_config = if_old->config;
1136         bool reload = false, reload_ip = false;
1137
1138 #define FIELD_CHANGED_STR(field)                                        \
1139                 ((!!if_old->field != !!if_new->field) ||                \
1140                  (if_old->field &&                                      \
1141                   strcmp(if_old->field, if_new->field) != 0))
1142
1143         if (FIELD_CHANGED_STR(parent_ifname)) {
1144                 if (if_old->parent_iface.iface)
1145                         interface_remove_user(&if_old->parent_iface);
1146                 reload = true;
1147         }
1148
1149         if (!reload && interface_device_config_changed(if_old, if_new))
1150                 reload = true;
1151
1152         if (FIELD_CHANGED_STR(ifname) ||
1153             if_old->proto_handler != if_new->proto_handler)
1154                 reload = true;
1155
1156         if (!if_old->proto_handler->config_params)
1157                 D(INTERFACE, "No config parameters for interface '%s'\n",
1158                   if_old->name);
1159         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1160                                        if_old->proto_handler->config_params))
1161                 reload = true;
1162
1163 #define UPDATE(field, __var) ({                                         \
1164                 bool __changed = (if_old->field != if_new->field);      \
1165                 if_old->field = if_new->field;                          \
1166                 __var |= __changed;                                     \
1167         })
1168
1169         if_old->config = if_new->config;
1170         if (if_old->config_autostart != if_new->config_autostart) {
1171                 if (if_old->config_autostart)
1172                         reload = true;
1173
1174                 if_old->autostart = if_new->config_autostart;
1175         }
1176
1177         if_old->device_config = if_new->device_config;
1178         if_old->config_autostart = if_new->config_autostart;
1179         if_old->ifname = if_new->ifname;
1180         if_old->parent_ifname = if_new->parent_ifname;
1181         if_old->proto_handler = if_new->proto_handler;
1182         if_old->force_link = if_new->force_link;
1183
1184         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1185         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1186
1187         UPDATE(metric, reload_ip);
1188         UPDATE(proto_ip.no_defaultroute, reload_ip);
1189         UPDATE(ip4table, reload_ip);
1190         UPDATE(ip6table, reload_ip);
1191         interface_merge_assignment_data(if_old, if_new);
1192
1193 #undef UPDATE
1194
1195         if (reload) {
1196                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1197                   if_old->name);
1198                 interface_clear_errors(if_old);
1199                 set_config_state(if_old, IFC_RELOAD);
1200                 goto out;
1201         }
1202
1203         if (reload_ip) {
1204                 bool config_ip_enabled = if_old->config_ip.enabled;
1205                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1206
1207                 interface_ip_set_enabled(&if_old->config_ip, false);
1208                 interface_ip_set_enabled(&if_old->proto_ip, false);
1209                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1210                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1211         }
1212
1213         interface_write_resolv_conf();
1214         if (if_old->main_dev.dev)
1215                 interface_check_state(if_old);
1216
1217 out:
1218         if_new->config = NULL;
1219         interface_cleanup(if_new);
1220         free(old_config);
1221         free(if_new);
1222 }
1223
1224 static void
1225 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1226                  struct vlist_node *node_old)
1227 {
1228         struct interface *if_old = container_of(node_old, struct interface, node);
1229         struct interface *if_new = container_of(node_new, struct interface, node);
1230
1231         if (node_old && node_new) {
1232                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1233                 interface_change_config(if_old, if_new);
1234         } else if (node_old) {
1235                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1236                 set_config_state(if_old, IFC_REMOVE);
1237         } else if (node_new) {
1238                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1239                 proto_init_interface(if_new, if_new->config);
1240                 interface_claim_device(if_new);
1241                 netifd_ubus_add_interface(if_new);
1242         }
1243 }
1244
1245
1246 static void __init
1247 interface_init_list(void)
1248 {
1249         vlist_init(&interfaces, avl_strcmp, interface_update);
1250         interfaces.keep_old = true;
1251         interfaces.no_delete = true;
1252 }