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 static unsigned int interface_serial = 0;
  30
  31 enum {
  32         IFACE_ATTR_IFNAME,
  33         IFACE_ATTR_PROTO,
  34         IFACE_ATTR_AUTO,
  35         IFACE_ATTR_DEFAULTROUTE,
  36         IFACE_ATTR_PEERDNS,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DNS_SEARCH,
  39         IFACE_ATTR_METRIC,
  40         IFACE_ATTR_INTERFACE,
  41         IFACE_ATTR_IP6ASSIGN,
  42         IFACE_ATTR_IP6HINT,
  43         IFACE_ATTR_IP4TABLE,
  44         IFACE_ATTR_IP6TABLE,
  45         IFACE_ATTR_IP6CLASS,
  46         IFACE_ATTR_DELEGATE,
  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 };
  67
  68 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  69         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  71 };
  72
  73 const struct uci_blob_param_list interface_attr_list = {
  74         .n_params = IFACE_ATTR_MAX,
  75         .params = iface_attrs,
  76         .info = iface_attr_info,
  77 };
  78
  79 static void
  80 interface_clear_errors(struct interface *iface)
  81 {
  82         struct interface_error *error, *tmp;
  83
  84         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  85                 list_del(&error->list);
  86                 free(error);
  87         }
  88 }
  89
  90 void interface_add_error(struct interface *iface, const char *subsystem,
  91                          const char *code, const char **data, int n_data)
  92 {
  93         struct interface_error *error;
  94         int i, len = 0;
  95         int *datalen = NULL;
  96         char *dest, *d_subsys, *d_code;
  97
  98         if (n_data) {
  99                 len = n_data * sizeof(char *);
 100                 datalen = alloca(len);
 101                 for (i = 0; i < n_data; i++) {
 102                         datalen[i] = strlen(data[i]) + 1;
 103                         len += datalen[i];
 104                 }
 105         }
 106
 107         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 108                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 109                 &d_code, code ? strlen(code) + 1 : 0);
 110         if (!error)
 111                 return;
 112
 113         list_add_tail(&error->list, &iface->errors);
 114
 115         dest = (char *) &error->data[n_data + 1];
 116         for (i = 0; i < n_data; i++) {
 117                 error->data[i] = dest;
 118                 memcpy(dest, data[i], datalen[i]);
 119                 dest += datalen[i];
 120         }
 121         error->data[n_data++] = NULL;
 122
 123         if (subsystem)
 124                 error->subsystem = strcpy(d_subsys, subsystem);
 125
 126         if (code)
 127                 error->code = strcpy(d_code, code);
 128 }
 129
 130 static void
 131 interface_data_del(struct interface *iface, struct interface_data *data)
 132 {
 133         avl_delete(&iface->data, &data->node);
 134         free(data);
 135 }
 136
 137 static void
 138 interface_data_flush(struct interface *iface)
 139 {
 140         struct interface_data *d, *tmp;
 141
 142         avl_for_each_element_safe(&iface->data, d, node, tmp)
 143                 interface_data_del(iface, d);
 144 }
 145
 146 int
 147 interface_add_data(struct interface *iface, const struct blob_attr *data)
 148 {
 149         struct interface_data *n, *o;
 150
 151         if (!blobmsg_check_attr(data, true))
 152                 return UBUS_STATUS_INVALID_ARGUMENT;
 153
 154         const char *name = blobmsg_name(data);
 155         unsigned len = blob_pad_len(data);
 156
 157         o = avl_find_element(&iface->data, name, o, node);
 158         if (o) {
 159                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 160                         return 0;
 161
 162                 interface_data_del(iface, o);
 163         }
 164
 165         n = calloc(1, sizeof(*n) + len);
 166         memcpy(n->data, data, len);
 167         n->node.key = blobmsg_name(n->data);
 168         avl_insert(&iface->data, &n->node);
 169
 170         iface->updated |= IUF_DATA;
 171         return 0;
 172 }
 173
 174 static void
 175 interface_event(struct interface *iface, enum interface_event ev)
 176 {
 177         struct interface_user *dep, *tmp;
 178         struct device *adev = NULL;
 179
 180         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 181                 dep->cb(dep, iface, ev);
 182
 183         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 184                 dep->cb(dep, iface, ev);
 185
 186         switch (ev) {
 187         case IFEV_UP:
 188                 adev = iface->l3_dev.dev;
 189                 /* fall through */
 190         case IFEV_DOWN:
 191                 alias_notify_device(iface->name, adev);
 192                 break;
 193         default:
 194                 break;
 195         }
 196 }
 197
 198 static void
 199 interface_flush_state(struct interface *iface)
 200 {
 201         if (iface->l3_dev.dev)
 202                 device_release(&iface->l3_dev);
 203         interface_data_flush(iface);
 204 }
 205
 206 static void
 207 mark_interface_down(struct interface *iface)
 208 {
 209         enum interface_state state = iface->state;
 210
 211         iface->state = IFS_DOWN;
 212         if (state == IFS_UP)
 213                 interface_event(iface, IFEV_DOWN);
 214         interface_ip_set_enabled(&iface->config_ip, false);
 215         interface_ip_flush(&iface->proto_ip);
 216         interface_flush_state(iface);
 217         system_flush_routes();
 218 }
 219
 220 void
 221 __interface_set_down(struct interface *iface, bool force)
 222 {
 223         if (iface->state == IFS_DOWN ||
 224                 iface->state == IFS_TEARDOWN)
 225                 return;
 226
 227         if (iface->state == IFS_UP)
 228                 interface_event(iface, IFEV_DOWN);
 229         iface->state = IFS_TEARDOWN;
 230         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 231         if (force)
 232                 interface_flush_state(iface);
 233
 234         if (iface->dynamic)
 235                 vlist_delete(&interfaces, &iface->node);
 236 }
 237
 238 static void
 239 interface_cb(struct device_user *dep, enum device_event ev)
 240 {
 241         struct interface *iface;
 242         bool new_state;
 243
 244         iface = container_of(dep, struct interface, main_dev);
 245         switch (ev) {
 246         case DEV_EVENT_ADD:
 247                 new_state = true;
 248                 break;
 249         case DEV_EVENT_REMOVE:
 250                 new_state = false;
 251                 break;
 252         default:
 253                 return;
 254         }
 255
 256         interface_set_available(iface, new_state);
 257         if (!new_state && dep->dev->external)
 258                 interface_set_main_dev(iface, NULL);
 259 }
 260
 261 void
 262 interface_set_available(struct interface *iface, bool new_state)
 263 {
 264         if (iface->available == new_state)
 265                 return;
 266
 267         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 268         iface->available = new_state;
 269
 270         if (new_state) {
 271                 if (iface->autostart && !config_init)
 272                         interface_set_up(iface);
 273         } else
 274                 __interface_set_down(iface, true);
 275 }
 276
 277 void
 278 interface_add_user(struct interface_user *dep, struct interface *iface)
 279 {
 280         if (!iface) {
 281                 list_add(&dep->list, &iface_all_users);
 282                 return;
 283         }
 284
 285         dep->iface = iface;
 286         list_add(&dep->list, &iface->users);
 287         if (iface->state == IFS_UP)
 288                 dep->cb(dep, iface, IFEV_UP);
 289 }
 290
 291 void
 292 interface_remove_user(struct interface_user *dep)
 293 {
 294         list_del_init(&dep->list);
 295         dep->iface = NULL;
 296 }
 297
 298 static void
 299 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 300 {
 301         struct blob_attr *cur;
 302         int rem;
 303
 304         blobmsg_for_each_attr(cur, list, rem) {
 305                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 306                         continue;
 307
 308                 if (!blobmsg_check_attr(cur, NULL))
 309                         continue;
 310
 311                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 312                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 313                 list_add(&c->head, &iface->assignment_classes);
 314         }
 315 }
 316
 317 static void
 318 interface_clear_assignment_classes(struct interface *iface)
 319 {
 320         while (!list_empty(&iface->assignment_classes)) {
 321                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 322                                 struct interface_assignment_class, head);
 323                 list_del(&c->head);
 324                 free(c);
 325         }
 326 }
 327
 328 static void
 329 interface_merge_assignment_data(struct interface *old, struct interface *new)
 330 {
 331         bool changed = (old->assignment_hint != new->assignment_hint ||
 332                         old->assignment_length != new->assignment_length ||
 333                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 334
 335         struct interface_assignment_class *c;
 336         list_for_each_entry(c, &new->assignment_classes, head) {
 337                 // Compare list entries one-by-one to see if there was a change
 338                 if (list_empty(&old->assignment_classes)) // The new list is longer
 339                         changed = true;
 340
 341                 if (changed)
 342                         break;
 343
 344                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 345                                 struct interface_assignment_class, head);
 346
 347                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 348                         break;
 349
 350                 list_del(&c_old->head);
 351                 free(c_old);
 352         }
 353
 354         // The old list was longer than the new one or the last entry didn't match
 355         if (!list_empty(&old->assignment_classes)) {
 356                 interface_clear_assignment_classes(old);
 357                 changed = true;
 358         }
 359
 360         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 361
 362         if (changed) {
 363                 old->assignment_hint = new->assignment_hint;
 364                 old->assignment_length = new->assignment_length;
 365                 interface_refresh_assignments(true);
 366         }
 367 }
 368
 369 static void
 370 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 371 {
 372         struct interface *alias = container_of(dep, struct interface, parent_iface);
 373         struct device *dev = iface->l3_dev.dev;
 374
 375         switch (ev) {
 376         case IFEV_UP:
 377                 if (!dev)
 378                         return;
 379
 380                 interface_set_main_dev(alias, dev);
 381                 interface_set_available(alias, true);
 382                 break;
 383         case IFEV_DOWN:
 384                 interface_set_available(alias, false);
 385                 interface_set_main_dev(alias, NULL);
 386                 break;
 387         case IFEV_FREE:
 388                 interface_remove_user(dep);
 389                 break;
 390         case IFEV_RELOAD:
 391         case IFEV_UPDATE:
 392                 break;
 393         }
 394 }
 395
 396 static void
 397 interface_claim_device(struct interface *iface)
 398 {
 399         struct interface *parent;
 400         struct device *dev = NULL;
 401
 402         if (iface->parent_iface.iface)
 403                 interface_remove_user(&iface->parent_iface);
 404
 405         if (iface->parent_ifname) {
 406                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 407                 iface->parent_iface.cb = interface_alias_cb;
 408                 interface_add_user(&iface->parent_iface, parent);
 409         } else if (iface->ifname &&
 410                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 411                 dev = device_get(iface->ifname, true);
 412         }
 413
 414         if (dev)
 415                 interface_set_main_dev(iface, dev);
 416
 417         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 418                 interface_set_available(iface, true);
 419 }
 420
 421 static void
 422 interface_cleanup_state(struct interface *iface)
 423 {
 424         interface_set_available(iface, false);
 425
 426         interface_flush_state(iface);
 427         interface_clear_errors(iface);
 428         interface_set_proto_state(iface, NULL);
 429
 430         if (iface->main_dev.dev)
 431                 interface_set_main_dev(iface, NULL);
 432 }
 433
 434 static void
 435 interface_cleanup(struct interface *iface)
 436 {
 437         struct interface_user *dep, *tmp;
 438
 439         if (iface->parent_iface.iface)
 440                 interface_remove_user(&iface->parent_iface);
 441
 442         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 443                 interface_remove_user(dep);
 444
 445         interface_clear_assignment_classes(iface);
 446         interface_ip_flush(&iface->config_ip);
 447         interface_cleanup_state(iface);
 448 }
 449
 450 static void
 451 interface_do_free(struct interface *iface)
 452 {
 453         interface_event(iface, IFEV_FREE);
 454         interface_cleanup(iface);
 455         free(iface->config);
 456         netifd_ubus_remove_interface(iface);
 457         avl_delete(&interfaces.avl, &iface->node.avl);
 458         free(iface);
 459 }
 460
 461 static void
 462 interface_do_reload(struct interface *iface)
 463 {
 464         interface_event(iface, IFEV_RELOAD);
 465         interface_cleanup_state(iface);
 466         proto_init_interface(iface, iface->config);
 467         interface_claim_device(iface);
 468 }
 469
 470 static void
 471 interface_handle_config_change(struct interface *iface)
 472 {
 473         enum interface_config_state state = iface->config_state;
 474
 475         iface->config_state = IFC_NORMAL;
 476         switch(state) {
 477         case IFC_NORMAL:
 478                 break;
 479         case IFC_RELOAD:
 480                 interface_do_reload(iface);
 481                 break;
 482         case IFC_REMOVE:
 483                 interface_do_free(iface);
 484                 return;
 485         }
 486         if (iface->autostart && iface->available)
 487                 interface_set_up(iface);
 488 }
 489
 490 static void
 491 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 492 {
 493         struct interface *iface = state->iface;
 494
 495         switch (ev) {
 496         case IFPEV_UP:
 497                 if (iface->state != IFS_SETUP) {
 498                         interface_event(iface, IFEV_UPDATE);
 499                         return;
 500                 }
 501
 502                 interface_ip_set_enabled(&iface->config_ip, true);
 503                 system_flush_routes();
 504                 iface->state = IFS_UP;
 505                 iface->start_time = system_get_rtime();
 506                 interface_event(iface, IFEV_UP);
 507                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 508                 break;
 509         case IFPEV_DOWN:
 510                 if (iface->state == IFS_DOWN)
 511                         return;
 512
 513                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 514                 mark_interface_down(iface);
 515                 if (iface->main_dev.dev)
 516                         device_release(&iface->main_dev);
 517                 interface_handle_config_change(iface);
 518                 break;
 519         case IFPEV_LINK_LOST:
 520                 if (iface->state != IFS_UP)
 521                         return;
 522
 523                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 524                 mark_interface_down(iface);
 525                 iface->state = IFS_SETUP;
 526                 break;
 527         }
 528
 529         interface_write_resolv_conf();
 530 }
 531
 532 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 533 {
 534         if (iface->proto) {
 535                 iface->proto->free(iface->proto);
 536                 iface->proto = NULL;
 537         }
 538         iface->state = IFS_DOWN;
 539         iface->proto = state;
 540         if (!state)
 541                 return;
 542
 543         state->proto_event = interface_proto_cb;
 544         state->iface = iface;
 545 }
 546
 547 struct interface *
 548 interface_alloc(const char *name, struct blob_attr *config)
 549 {
 550         struct interface *iface;
 551         struct blob_attr *tb[IFACE_ATTR_MAX];
 552         struct blob_attr *cur;
 553         const char *proto_name = NULL;
 554         char *iface_name;
 555
 556         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 557         iface->name = strcpy(iface_name, name);
 558         INIT_LIST_HEAD(&iface->errors);
 559         INIT_LIST_HEAD(&iface->users);
 560         INIT_LIST_HEAD(&iface->hotplug_list);
 561         INIT_LIST_HEAD(&iface->assignment_classes);
 562         interface_ip_init(iface);
 563         avl_init(&iface->data, avl_strcmp, false, NULL);
 564         iface->config_ip.enabled = false;
 565
 566         iface->main_dev.cb = interface_cb;
 567
 568         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 569                       blob_data(config), blob_len(config));
 570
 571         if ((cur = tb[IFACE_ATTR_PROTO]))
 572                 proto_name = blobmsg_data(cur);
 573
 574         proto_attach_interface(iface, proto_name);
 575
 576         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 577         iface->proto_ip.no_defaultroute =
 578                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 579         iface->proto_ip.no_dns =
 580                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 581
 582         if ((cur = tb[IFACE_ATTR_DNS]))
 583                 interface_add_dns_server_list(&iface->config_ip, cur);
 584
 585         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 586                 interface_add_dns_search_list(&iface->config_ip, cur);
 587
 588         if ((cur = tb[IFACE_ATTR_METRIC]))
 589                 iface->metric = blobmsg_get_u32(cur);
 590
 591         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 592                 iface->assignment_length = blobmsg_get_u32(cur);
 593
 594         iface->assignment_hint = -1;
 595         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 596                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 597                                 ~((1 << (64 - iface->assignment_length)) - 1);
 598
 599         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 600                 interface_add_assignment_classes(iface, cur);
 601
 602
 603         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 604                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 605                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 606         }
 607
 608         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 609         struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node);
 610         if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000)
 611                 iface->ip6table = iface_old->ip6table;
 612         else
 613                 iface->ip6table = 1000 + ++interface_serial;
 614
 615         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 616                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 617                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 618         }
 619
 620         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 621
 622         iface->config_autostart = iface->autostart;
 623         return iface;
 624 }
 625
 626 void interface_set_dynamic(struct interface *iface)
 627 {
 628         iface->dynamic = true;
 629         iface->node.version = -1; // Don't delete on reload
 630 }
 631
 632 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 633 {
 634         struct blob_attr *tb[IFACE_ATTR_MAX];
 635         struct blob_attr *cur;
 636
 637         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 638                       blob_data(config), blob_len(config));
 639
 640         if (alias) {
 641                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 642                         iface->parent_ifname = blobmsg_data(cur);
 643
 644                 if (!iface->parent_ifname)
 645                         return false;
 646         } else {
 647                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 648                         iface->ifname = blobmsg_data(cur);
 649         }
 650
 651
 652         iface->config = config;
 653         vlist_add(&interfaces, &iface->node, iface->name);
 654         return true;
 655 }
 656
 657 void
 658 interface_add(struct interface *iface, struct blob_attr *config)
 659 {
 660         __interface_add(iface, config, false);
 661 }
 662
 663 bool
 664 interface_add_alias(struct interface *iface, struct blob_attr *config)
 665 {
 666         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 667                 return false;
 668
 669         return __interface_add(iface, config, true);
 670 }
 671
 672 void
 673 interface_set_l3_dev(struct interface *iface, struct device *dev)
 674 {
 675         bool enabled = iface->config_ip.enabled;
 676         bool claimed = iface->l3_dev.claimed;
 677
 678         if (iface->l3_dev.dev == dev)
 679                 return;
 680
 681         interface_ip_set_enabled(&iface->config_ip, false);
 682         interface_ip_flush(&iface->proto_ip);
 683         device_add_user(&iface->l3_dev, dev);
 684
 685         if (dev) {
 686                 if (claimed)
 687                         device_claim(&iface->l3_dev);
 688                 interface_ip_set_enabled(&iface->config_ip, enabled);
 689         }
 690 }
 691
 692 void
 693 interface_set_main_dev(struct interface *iface, struct device *dev)
 694 {
 695         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 696         bool claimed = iface->l3_dev.claimed;
 697
 698         if (iface->main_dev.dev == dev)
 699                 return;
 700
 701         if (set_l3)
 702                 interface_set_l3_dev(iface, dev);
 703
 704         device_add_user(&iface->main_dev, dev);
 705         if (!dev)
 706                 return;
 707
 708         if (claimed)
 709                 device_claim(&iface->l3_dev);
 710
 711         if (!iface->l3_dev.dev)
 712                 interface_set_l3_dev(iface, dev);
 713 }
 714
 715 int
 716 interface_remove_link(struct interface *iface, struct device *dev)
 717 {
 718         struct device *mdev = iface->main_dev.dev;
 719
 720         if (mdev && mdev->hotplug_ops)
 721                 return mdev->hotplug_ops->del(mdev, dev);
 722
 723         if (!iface->main_dev.hotplug)
 724                 return UBUS_STATUS_INVALID_ARGUMENT;
 725
 726         if (dev != iface->main_dev.dev)
 727                 return UBUS_STATUS_INVALID_ARGUMENT;
 728
 729         device_remove_user(&iface->main_dev);
 730         return 0;
 731 }
 732
 733 int
 734 interface_add_link(struct interface *iface, struct device *dev)
 735 {
 736         struct device *mdev = iface->main_dev.dev;
 737
 738         if (mdev == dev)
 739                 return 0;
 740
 741         if (iface->main_dev.hotplug)
 742                 device_remove_user(&iface->main_dev);
 743
 744         if (mdev) {
 745                 if (mdev->hotplug_ops)
 746                         return mdev->hotplug_ops->add(mdev, dev);
 747                 else
 748                         return UBUS_STATUS_NOT_SUPPORTED;
 749         }
 750
 751         interface_set_main_dev(iface, dev);
 752         iface->main_dev.hotplug = true;
 753         return 0;
 754 }
 755
 756 int
 757 interface_handle_link(struct interface *iface, const char *name, bool add)
 758 {
 759         struct device *dev;
 760         int ret;
 761
 762         device_lock();
 763
 764         dev = device_get(name, add ? 2 : 0);
 765         if (!dev) {
 766                 ret = UBUS_STATUS_NOT_FOUND;
 767                 goto out;
 768         }
 769
 770         if (add) {
 771                 device_set_present(dev, true);
 772                 if (iface->device_config)
 773                         device_set_config(dev, &simple_device_type, iface->config);
 774
 775                 system_if_apply_settings(dev, &dev->settings);
 776                 ret = interface_add_link(iface, dev);
 777         } else {
 778                 ret = interface_remove_link(iface, dev);
 779         }
 780
 781 out:
 782         device_unlock();
 783
 784         return ret;
 785 }
 786
 787 int
 788 interface_set_up(struct interface *iface)
 789 {
 790         int ret;
 791
 792         iface->autostart = true;
 793
 794         if (iface->state != IFS_DOWN)
 795                 return 0;
 796
 797         interface_clear_errors(iface);
 798         if (!iface->available) {
 799                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 800                 return -1;
 801         }
 802
 803         if (iface->main_dev.dev) {
 804                 ret = device_claim(&iface->main_dev);
 805                 if (ret)
 806                         return ret;
 807         }
 808
 809         iface->state = IFS_SETUP;
 810         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 811         if (ret) {
 812                 mark_interface_down(iface);
 813                 return ret;
 814         }
 815
 816         return 0;
 817 }
 818
 819 int
 820 interface_set_down(struct interface *iface)
 821 {
 822         if (!iface) {
 823                 vlist_for_each_element(&interfaces, iface, node)
 824                         __interface_set_down(iface, false);
 825         } else {
 826                 iface->autostart = false;
 827                 __interface_set_down(iface, false);
 828         }
 829
 830         return 0;
 831 }
 832
 833 void
 834 interface_start_pending(void)
 835 {
 836         struct interface *iface;
 837
 838         vlist_for_each_element(&interfaces, iface, node) {
 839                 if (iface->available && iface->autostart)
 840                         interface_set_up(iface);
 841         }
 842 }
 843
 844 static void
 845 set_config_state(struct interface *iface, enum interface_config_state s)
 846 {
 847         iface->config_state = s;
 848         if (iface->state == IFS_DOWN)
 849                 interface_handle_config_change(iface);
 850         else
 851                 __interface_set_down(iface, false);
 852 }
 853
 854 void
 855 interface_update_start(struct interface *iface)
 856 {
 857         iface->updated = 0;
 858         interface_ip_update_start(&iface->proto_ip);
 859 }
 860
 861 void
 862 interface_update_complete(struct interface *iface)
 863 {
 864         interface_ip_update_complete(&iface->proto_ip);
 865 }
 866
 867 static void
 868 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 869 {
 870         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 871         vlist_simple_replace(&new->dns_search, &old->dns_search);
 872 }
 873
 874 static void
 875 interface_change_config(struct interface *if_old, struct interface *if_new)
 876 {
 877         struct blob_attr *old_config = if_old->config;
 878         bool reload = false, reload_ip = false;
 879
 880 #define FIELD_CHANGED_STR(field)                                        \
 881                 ((!!if_old->field != !!if_new->field) ||                \
 882                  (if_old->field &&                                      \
 883                   strcmp(if_old->field, if_new->field) != 0))
 884
 885         if (FIELD_CHANGED_STR(parent_ifname)) {
 886                 if (if_old->parent_iface.iface)
 887                         interface_remove_user(&if_old->parent_iface);
 888                 reload = true;
 889         }
 890
 891         if (FIELD_CHANGED_STR(ifname) ||
 892             if_old->proto_handler != if_new->proto_handler)
 893                 reload = true;
 894
 895         if (!if_old->proto_handler->config_params)
 896                 D(INTERFACE, "No config parameters for interface '%s'\n",
 897                   if_old->name);
 898         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 899                                        if_old->proto_handler->config_params))
 900                 reload = true;
 901
 902 #define UPDATE(field, __var) ({                                         \
 903                 bool __changed = (if_old->field != if_new->field);      \
 904                 if_old->field = if_new->field;                          \
 905                 __var |= __changed;                                     \
 906         })
 907
 908         if_old->config = if_new->config;
 909         if (!if_old->config_autostart && if_new->config_autostart)
 910                 if_old->autostart = true;
 911
 912         if_old->device_config = if_new->device_config;
 913         if_old->config_autostart = if_new->config_autostart;
 914         if_old->ifname = if_new->ifname;
 915         if_old->parent_ifname = if_new->parent_ifname;
 916         if_old->proto_handler = if_new->proto_handler;
 917
 918         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 919         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 920
 921         UPDATE(metric, reload_ip);
 922         UPDATE(proto_ip.no_defaultroute, reload_ip);
 923         UPDATE(ip4table, reload_ip);
 924         UPDATE(ip6table, reload_ip);
 925         interface_merge_assignment_data(if_old, if_new);
 926
 927 #undef UPDATE
 928
 929         if (reload) {
 930                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
 931                   if_old->name);
 932                 interface_clear_errors(if_old);
 933                 set_config_state(if_old, IFC_RELOAD);
 934                 goto out;
 935         }
 936
 937         if (reload_ip) {
 938                 interface_ip_set_enabled(&if_old->config_ip, false);
 939                 interface_ip_set_enabled(&if_old->proto_ip, false);
 940                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 941                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 942         }
 943
 944         interface_write_resolv_conf();
 945
 946 out:
 947         if_new->config = NULL;
 948         interface_cleanup(if_new);
 949         free(old_config);
 950         free(if_new);
 951 }
 952
 953 static void
 954 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 955                  struct vlist_node *node_old)
 956 {
 957         struct interface *if_old = container_of(node_old, struct interface, node);
 958         struct interface *if_new = container_of(node_new, struct interface, node);
 959
 960         if (node_old && node_new) {
 961                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 962                 interface_change_config(if_old, if_new);
 963         } else if (node_old) {
 964                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 965                 set_config_state(if_old, IFC_REMOVE);
 966         } else if (node_new) {
 967                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 968                 proto_init_interface(if_new, if_new->config);
 969                 interface_claim_device(if_new);
 970                 netifd_ubus_add_interface(if_new);
 971         }
 972 }
 973
 974
 975 static void __init
 976 interface_init_list(void)
 977 {
 978         vlist_init(&interfaces, avl_strcmp, interface_update);
 979         interfaces.keep_old = true;
 980         interfaces.no_delete = true;
 981 }