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                 if (dev && dev->default_config && iface->device_config)
 505                         device_set_config(dev, dev->type, iface->config);
 506         } else {
 507                 dev = iface->ext_dev.dev;
 508         }
 509
 510         if (dev)
 511                 interface_set_main_dev(iface, dev);
 512
 513         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 514                 interface_set_available(iface, true);
 515 }
 516
 517 static void
 518 interface_cleanup_state(struct interface *iface)
 519 {
 520         interface_set_available(iface, false);
 521
 522         interface_flush_state(iface);
 523         interface_clear_errors(iface);
 524         interface_set_proto_state(iface, NULL);
 525
 526         interface_set_main_dev(iface, NULL);
 527         interface_set_l3_dev(iface, NULL);
 528 }
 529
 530 static void
 531 interface_cleanup(struct interface *iface)
 532 {
 533         struct interface_user *dep, *tmp;
 534
 535         uloop_timeout_cancel(&iface->remove_timer);
 536         device_remove_user(&iface->ext_dev);
 537
 538         if (iface->parent_iface.iface)
 539                 interface_remove_user(&iface->parent_iface);
 540
 541         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 542                 interface_remove_user(dep);
 543
 544         interface_clear_assignment_classes(iface);
 545         interface_ip_flush(&iface->config_ip);
 546         interface_cleanup_state(iface);
 547 }
 548
 549 static void
 550 interface_do_free(struct interface *iface)
 551 {
 552         interface_event(iface, IFEV_FREE);
 553         interface_cleanup(iface);
 554         free(iface->config);
 555         netifd_ubus_remove_interface(iface);
 556         avl_delete(&interfaces.avl, &iface->node.avl);
 557         free(iface);
 558 }
 559
 560 static void
 561 interface_do_reload(struct interface *iface)
 562 {
 563         interface_event(iface, IFEV_RELOAD);
 564         interface_cleanup_state(iface);
 565         proto_init_interface(iface, iface->config);
 566         interface_claim_device(iface);
 567 }
 568
 569 static void
 570 interface_handle_config_change(struct interface *iface)
 571 {
 572         enum interface_config_state state = iface->config_state;
 573
 574         iface->config_state = IFC_NORMAL;
 575         switch(state) {
 576         case IFC_NORMAL:
 577                 break;
 578         case IFC_RELOAD:
 579                 interface_do_reload(iface);
 580                 break;
 581         case IFC_REMOVE:
 582                 interface_do_free(iface);
 583                 return;
 584         }
 585         if (iface->autostart && iface->available)
 586                 interface_set_up(iface);
 587 }
 588
 589 static void
 590 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 591 {
 592         struct interface *iface = state->iface;
 593
 594         switch (ev) {
 595         case IFPEV_UP:
 596                 if (iface->state != IFS_SETUP) {
 597                         interface_event(iface, IFEV_UPDATE);
 598                         return;
 599                 }
 600
 601                 if (!iface->l3_dev.dev)
 602                         interface_set_l3_dev(iface, iface->main_dev.dev);
 603
 604                 interface_ip_set_enabled(&iface->config_ip, true);
 605                 system_flush_routes();
 606                 iface->state = IFS_UP;
 607                 iface->start_time = system_get_rtime();
 608                 interface_event(iface, IFEV_UP);
 609                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 610                 break;
 611         case IFPEV_DOWN:
 612                 if (iface->state == IFS_DOWN)
 613                         return;
 614
 615                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 616                 mark_interface_down(iface);
 617                 if (iface->main_dev.dev)
 618                         device_release(&iface->main_dev);
 619                 if (iface->l3_dev.dev)
 620                         device_remove_user(&iface->l3_dev);
 621                 interface_handle_config_change(iface);
 622                 break;
 623         case IFPEV_LINK_LOST:
 624                 if (iface->state != IFS_UP)
 625                         return;
 626
 627                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 628                 mark_interface_down(iface);
 629                 iface->state = IFS_SETUP;
 630                 break;
 631         default:
 632                 return;
 633         }
 634
 635         interface_write_resolv_conf();
 636 }
 637
 638 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 639 {
 640         if (iface->proto) {
 641                 iface->proto->free(iface->proto);
 642                 iface->proto = NULL;
 643         }
 644         iface->state = IFS_DOWN;
 645         iface->proto = state;
 646         if (!state)
 647                 return;
 648
 649         state->proto_event = interface_proto_cb;
 650         state->iface = iface;
 651 }
 652
 653 struct interface *
 654 interface_alloc(const char *name, struct blob_attr *config)
 655 {
 656         struct interface *iface;
 657         struct blob_attr *tb[IFACE_ATTR_MAX];
 658         struct blob_attr *cur;
 659         const char *proto_name = NULL;
 660         char *iface_name;
 661         bool force_link = false;
 662
 663         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 664         iface->name = strcpy(iface_name, name);
 665         INIT_LIST_HEAD(&iface->errors);
 666         INIT_LIST_HEAD(&iface->users);
 667         INIT_LIST_HEAD(&iface->hotplug_list);
 668         INIT_LIST_HEAD(&iface->assignment_classes);
 669         interface_ip_init(iface);
 670         avl_init(&iface->data, avl_strcmp, false, NULL);
 671         iface->config_ip.enabled = false;
 672
 673         iface->main_dev.cb = interface_cb;
 674         iface->ext_dev.cb = interface_ext_cb;
 675
 676         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 677                       blob_data(config), blob_len(config));
 678
 679         if ((cur = tb[IFACE_ATTR_PROTO]))
 680                 proto_name = blobmsg_data(cur);
 681
 682         proto_attach_interface(iface, proto_name);
 683         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 684                 force_link = true;
 685
 686         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 687         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 688         iface->proto_ip.no_defaultroute =
 689                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 690         iface->proto_ip.no_dns =
 691                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 692
 693         if ((cur = tb[IFACE_ATTR_DNS]))
 694                 interface_add_dns_server_list(&iface->config_ip, cur);
 695
 696         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 697                 interface_add_dns_search_list(&iface->config_ip, cur);
 698
 699         if ((cur = tb[IFACE_ATTR_METRIC]))
 700                 iface->metric = blobmsg_get_u32(cur);
 701
 702         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 703                 iface->assignment_length = blobmsg_get_u32(cur);
 704
 705         iface->assignment_hint = -1;
 706         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 707                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 708                                 ~((1 << (64 - iface->assignment_length)) - 1);
 709
 710         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 711                 interface_add_assignment_classes(iface, cur);
 712
 713
 714         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 715                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 716                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 717         }
 718
 719         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 720                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 721                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 722         }
 723
 724         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 725
 726         iface->config_autostart = iface->autostart;
 727         return iface;
 728 }
 729
 730 void interface_set_dynamic(struct interface *iface)
 731 {
 732         iface->dynamic = true;
 733         iface->autostart = true;
 734         iface->node.version = -1; // Don't delete on reload
 735 }
 736
 737 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 738 {
 739         struct blob_attr *tb[IFACE_ATTR_MAX];
 740         struct blob_attr *cur;
 741
 742         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 743                       blob_data(config), blob_len(config));
 744
 745         if (alias) {
 746                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 747                         iface->parent_ifname = blobmsg_data(cur);
 748
 749                 if (!iface->parent_ifname)
 750                         return false;
 751         } else {
 752                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 753                         iface->ifname = blobmsg_data(cur);
 754         }
 755
 756
 757         iface->config = config;
 758         vlist_add(&interfaces, &iface->node, iface->name);
 759         return true;
 760 }
 761
 762 void
 763 interface_add(struct interface *iface, struct blob_attr *config)
 764 {
 765         __interface_add(iface, config, false);
 766 }
 767
 768 bool
 769 interface_add_alias(struct interface *iface, struct blob_attr *config)
 770 {
 771         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 772                 return false;
 773
 774         return __interface_add(iface, config, true);
 775 }
 776
 777 void
 778 interface_set_l3_dev(struct interface *iface, struct device *dev)
 779 {
 780         bool enabled = iface->config_ip.enabled;
 781         bool claimed = iface->l3_dev.claimed;
 782
 783         if (iface->l3_dev.dev == dev)
 784                 return;
 785
 786         interface_ip_set_enabled(&iface->config_ip, false);
 787         interface_ip_flush(&iface->proto_ip);
 788         device_add_user(&iface->l3_dev, dev);
 789
 790         if (dev) {
 791                 if (claimed) {
 792                         if (device_claim(&iface->l3_dev) < 0)
 793                                 return;
 794                 }
 795                 interface_ip_set_enabled(&iface->config_ip, enabled);
 796         }
 797 }
 798
 799 void
 800 interface_set_main_dev(struct interface *iface, struct device *dev)
 801 {
 802         bool claimed = iface->l3_dev.claimed;
 803
 804         if (iface->main_dev.dev == dev)
 805                 return;
 806
 807         interface_set_available(iface, false);
 808         device_add_user(&iface->main_dev, dev);
 809         if (!dev) {
 810                 interface_set_link_state(iface, false);
 811                 return;
 812         }
 813
 814         if (claimed) {
 815                 if (device_claim(&iface->l3_dev) < 0)
 816                         return;
 817         }
 818
 819         if (!iface->l3_dev.dev)
 820                 interface_set_l3_dev(iface, dev);
 821 }
 822
 823 int
 824 interface_remove_link(struct interface *iface, struct device *dev)
 825 {
 826         struct device *mdev = iface->main_dev.dev;
 827
 828         if (mdev && mdev->hotplug_ops)
 829                 return mdev->hotplug_ops->del(mdev, dev);
 830
 831         if (dev == iface->ext_dev.dev)
 832                 device_remove_user(&iface->ext_dev);
 833
 834         if (!iface->main_dev.hotplug)
 835                 return UBUS_STATUS_INVALID_ARGUMENT;
 836
 837         if (dev != iface->main_dev.dev)
 838                 return UBUS_STATUS_INVALID_ARGUMENT;
 839
 840         interface_set_main_dev(iface, NULL);
 841         return 0;
 842 }
 843
 844 static int
 845 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 846 {
 847         struct device *mdev = iface->main_dev.dev;
 848
 849         if (mdev == dev)
 850                 return 0;
 851
 852         if (iface->main_dev.hotplug)
 853                 device_remove_user(&iface->main_dev);
 854
 855         if (mdev) {
 856                 if (mdev->hotplug_ops)
 857                         return mdev->hotplug_ops->add(mdev, dev);
 858                 else
 859                         return UBUS_STATUS_NOT_SUPPORTED;
 860         }
 861
 862         if (link_ext)
 863                 device_add_user(&iface->ext_dev, dev);
 864
 865         interface_set_main_dev(iface, dev);
 866         iface->main_dev.hotplug = true;
 867         return 0;
 868 }
 869
 870 int
 871 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 872 {
 873         struct device *dev;
 874         int ret;
 875
 876         device_lock();
 877
 878         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 879         if (!dev) {
 880                 ret = UBUS_STATUS_NOT_FOUND;
 881                 goto out;
 882         }
 883
 884         if (add) {
 885                 device_set_present(dev, true);
 886                 if (iface->device_config && dev->default_config)
 887                         device_set_config(dev, dev->type, iface->config);
 888
 889                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 890                 ret = interface_add_link(iface, dev, link_ext);
 891         } else {
 892                 ret = interface_remove_link(iface, dev);
 893         }
 894
 895 out:
 896         device_unlock();
 897
 898         return ret;
 899 }
 900
 901 int
 902 interface_set_up(struct interface *iface)
 903 {
 904         int ret;
 905
 906         iface->autostart = true;
 907
 908         if (iface->state != IFS_DOWN)
 909                 return 0;
 910
 911         interface_clear_errors(iface);
 912         if (!iface->available) {
 913                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 914                 return -1;
 915         }
 916
 917         if (iface->main_dev.dev) {
 918                 ret = device_claim(&iface->main_dev);
 919                 if (!ret)
 920                         interface_check_state(iface);
 921         }
 922         else
 923                 ret = __interface_set_up(iface);
 924
 925         return ret;
 926 }
 927
 928 int
 929 interface_set_down(struct interface *iface)
 930 {
 931         if (!iface) {
 932                 vlist_for_each_element(&interfaces, iface, node)
 933                         __interface_set_down(iface, false);
 934         } else {
 935                 iface->autostart = false;
 936                 __interface_set_down(iface, false);
 937         }
 938
 939         return 0;
 940 }
 941
 942 void
 943 interface_start_pending(void)
 944 {
 945         struct interface *iface;
 946
 947         vlist_for_each_element(&interfaces, iface, node) {
 948                 if (iface->available && iface->autostart)
 949                         interface_set_up(iface);
 950         }
 951 }
 952
 953 static void
 954 set_config_state(struct interface *iface, enum interface_config_state s)
 955 {
 956         iface->config_state = s;
 957         if (iface->state == IFS_DOWN)
 958                 interface_handle_config_change(iface);
 959         else
 960                 __interface_set_down(iface, false);
 961 }
 962
 963 void
 964 interface_update_start(struct interface *iface)
 965 {
 966         iface->updated = 0;
 967         interface_ip_update_start(&iface->proto_ip);
 968 }
 969
 970 void
 971 interface_update_complete(struct interface *iface)
 972 {
 973         interface_ip_update_complete(&iface->proto_ip);
 974 }
 975
 976 static void
 977 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 978 {
 979         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 980         vlist_simple_replace(&new->dns_search, &old->dns_search);
 981 }
 982
 983 static void
 984 interface_change_config(struct interface *if_old, struct interface *if_new)
 985 {
 986         struct blob_attr *old_config = if_old->config;
 987         bool reload = false, reload_ip = false;
 988
 989 #define FIELD_CHANGED_STR(field)                                        \
 990                 ((!!if_old->field != !!if_new->field) ||                \
 991                  (if_old->field &&                                      \
 992                   strcmp(if_old->field, if_new->field) != 0))
 993
 994         if (FIELD_CHANGED_STR(parent_ifname)) {
 995                 if (if_old->parent_iface.iface)
 996                         interface_remove_user(&if_old->parent_iface);
 997                 reload = true;
 998         }
 999
1000         if (FIELD_CHANGED_STR(ifname) ||
1001             if_old->proto_handler != if_new->proto_handler)
1002                 reload = true;
1003
1004         if (!if_old->proto_handler->config_params)
1005                 D(INTERFACE, "No config parameters for interface '%s'\n",
1006                   if_old->name);
1007         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1008                                        if_old->proto_handler->config_params))
1009                 reload = true;
1010
1011 #define UPDATE(field, __var) ({                                         \
1012                 bool __changed = (if_old->field != if_new->field);      \
1013                 if_old->field = if_new->field;                          \
1014                 __var |= __changed;                                     \
1015         })
1016
1017         if_old->config = if_new->config;
1018         if (!if_old->config_autostart && if_new->config_autostart)
1019                 if_old->autostart = true;
1020
1021         if_old->device_config = if_new->device_config;
1022         if_old->config_autostart = if_new->config_autostart;
1023         if_old->ifname = if_new->ifname;
1024         if_old->parent_ifname = if_new->parent_ifname;
1025         if_old->proto_handler = if_new->proto_handler;
1026         if_old->force_link = if_new->force_link;
1027
1028         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1029         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1030
1031         UPDATE(metric, reload_ip);
1032         UPDATE(proto_ip.no_defaultroute, reload_ip);
1033         UPDATE(ip4table, reload_ip);
1034         UPDATE(ip6table, reload_ip);
1035         interface_merge_assignment_data(if_old, if_new);
1036
1037 #undef UPDATE
1038
1039         if (reload) {
1040                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1041                   if_old->name);
1042                 interface_clear_errors(if_old);
1043                 set_config_state(if_old, IFC_RELOAD);
1044                 goto out;
1045         }
1046
1047         if (reload_ip) {
1048                 bool config_ip_enabled = if_old->config_ip.enabled;
1049                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1050
1051                 interface_ip_set_enabled(&if_old->config_ip, false);
1052                 interface_ip_set_enabled(&if_old->proto_ip, false);
1053                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1054                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1055         }
1056
1057         interface_write_resolv_conf();
1058         if (if_old->main_dev.dev)
1059                 interface_check_state(if_old);
1060
1061 out:
1062         if_new->config = NULL;
1063         interface_cleanup(if_new);
1064         free(old_config);
1065         free(if_new);
1066 }
1067
1068 static void
1069 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1070                  struct vlist_node *node_old)
1071 {
1072         struct interface *if_old = container_of(node_old, struct interface, node);
1073         struct interface *if_new = container_of(node_new, struct interface, node);
1074
1075         if (node_old && node_new) {
1076                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1077                 interface_change_config(if_old, if_new);
1078         } else if (node_old) {
1079                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1080                 set_config_state(if_old, IFC_REMOVE);
1081         } else if (node_new) {
1082                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1083                 proto_init_interface(if_new, if_new->config);
1084                 interface_claim_device(if_new);
1085                 netifd_ubus_add_interface(if_new);
1086         }
1087 }
1088
1089
1090 static void __init
1091 interface_init_list(void)
1092 {
1093         vlist_init(&interfaces, avl_strcmp, interface_update);
1094         interfaces.keep_old = true;
1095         interfaces.no_delete = true;
1096 }