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