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