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_MAX
  47 };
  48
  49 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  50         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  51         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  53         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  56         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  57         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  59         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  64         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  65 };
  66
  67 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  68         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  69         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  70 };
  71
  72 const struct uci_blob_param_list interface_attr_list = {
  73         .n_params = IFACE_ATTR_MAX,
  74         .params = iface_attrs,
  75         .info = iface_attr_info,
  76 };
  77
  78 static void
  79 interface_clear_errors(struct interface *iface)
  80 {
  81         struct interface_error *error, *tmp;
  82
  83         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  84                 list_del(&error->list);
  85                 free(error);
  86         }
  87 }
  88
  89 void interface_add_error(struct interface *iface, const char *subsystem,
  90                          const char *code, const char **data, int n_data)
  91 {
  92         struct interface_error *error;
  93         int i, len = 0;
  94         int *datalen = NULL;
  95         char *dest, *d_subsys, *d_code;
  96
  97         if (n_data) {
  98                 len = n_data * sizeof(char *);
  99                 datalen = alloca(len);
 100                 for (i = 0; i < n_data; i++) {
 101                         datalen[i] = strlen(data[i]) + 1;
 102                         len += datalen[i];
 103                 }
 104         }
 105
 106         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 107                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 108                 &d_code, code ? strlen(code) + 1 : 0);
 109         if (!error)
 110                 return;
 111
 112         list_add_tail(&error->list, &iface->errors);
 113
 114         dest = (char *) &error->data[n_data + 1];
 115         for (i = 0; i < n_data; i++) {
 116                 error->data[i] = dest;
 117                 memcpy(dest, data[i], datalen[i]);
 118                 dest += datalen[i];
 119         }
 120         error->data[n_data++] = NULL;
 121
 122         if (subsystem)
 123                 error->subsystem = strcpy(d_subsys, subsystem);
 124
 125         if (code)
 126                 error->code = strcpy(d_code, code);
 127 }
 128
 129 static void
 130 interface_data_del(struct interface *iface, struct interface_data *data)
 131 {
 132         avl_delete(&iface->data, &data->node);
 133         free(data);
 134 }
 135
 136 static void
 137 interface_data_flush(struct interface *iface)
 138 {
 139         struct interface_data *d, *tmp;
 140
 141         avl_for_each_element_safe(&iface->data, d, node, tmp)
 142                 interface_data_del(iface, d);
 143 }
 144
 145 int
 146 interface_add_data(struct interface *iface, const struct blob_attr *data)
 147 {
 148         struct interface_data *n, *o;
 149
 150         if (!blobmsg_check_attr(data, true))
 151                 return UBUS_STATUS_INVALID_ARGUMENT;
 152
 153         const char *name = blobmsg_name(data);
 154         unsigned len = blob_pad_len(data);
 155
 156         o = avl_find_element(&iface->data, name, o, node);
 157         if (o) {
 158                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 159                         return 0;
 160
 161                 interface_data_del(iface, o);
 162         }
 163
 164         n = calloc(1, sizeof(*n) + len);
 165         memcpy(n->data, data, len);
 166         n->node.key = blobmsg_name(n->data);
 167         avl_insert(&iface->data, &n->node);
 168
 169         iface->updated |= IUF_DATA;
 170         return 0;
 171 }
 172
 173 static void
 174 interface_event(struct interface *iface, enum interface_event ev)
 175 {
 176         struct interface_user *dep, *tmp;
 177         struct device *adev = NULL;
 178
 179         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 180                 dep->cb(dep, iface, ev);
 181
 182         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 183                 dep->cb(dep, iface, ev);
 184
 185         switch (ev) {
 186         case IFEV_UP:
 187                 adev = iface->l3_dev.dev;
 188                 /* fall through */
 189         case IFEV_DOWN:
 190                 alias_notify_device(iface->name, adev);
 191                 break;
 192         default:
 193                 break;
 194         }
 195 }
 196
 197 static void
 198 interface_flush_state(struct interface *iface)
 199 {
 200         if (iface->l3_dev.dev)
 201                 device_release(&iface->l3_dev);
 202         interface_data_flush(iface);
 203 }
 204
 205 static void
 206 mark_interface_down(struct interface *iface)
 207 {
 208         enum interface_state state = iface->state;
 209
 210         iface->state = IFS_DOWN;
 211         if (state == IFS_UP)
 212                 interface_event(iface, IFEV_DOWN);
 213         interface_ip_set_enabled(&iface->config_ip, false);
 214         interface_ip_flush(&iface->proto_ip);
 215         interface_flush_state(iface);
 216         system_flush_routes();
 217 }
 218
 219 void
 220 __interface_set_down(struct interface *iface, bool force)
 221 {
 222         if (iface->state == IFS_DOWN ||
 223                 iface->state == IFS_TEARDOWN)
 224                 return;
 225
 226         if (iface->state == IFS_UP)
 227                 interface_event(iface, IFEV_DOWN);
 228         iface->state = IFS_TEARDOWN;
 229         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 230         if (force)
 231                 interface_flush_state(iface);
 232
 233         if (iface->dynamic)
 234                 vlist_delete(&interfaces, &iface->node);
 235 }
 236
 237 static void
 238 interface_cb(struct device_user *dep, enum device_event ev)
 239 {
 240         struct interface *iface;
 241         bool new_state;
 242
 243         iface = container_of(dep, struct interface, main_dev);
 244         switch (ev) {
 245         case DEV_EVENT_ADD:
 246                 new_state = true;
 247                 break;
 248         case DEV_EVENT_REMOVE:
 249                 new_state = false;
 250                 break;
 251         default:
 252                 return;
 253         }
 254
 255         interface_set_available(iface, new_state);
 256         if (!new_state && dep->dev->external)
 257                 interface_set_main_dev(iface, NULL);
 258 }
 259
 260 void
 261 interface_set_available(struct interface *iface, bool new_state)
 262 {
 263         if (iface->available == new_state)
 264                 return;
 265
 266         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 267         iface->available = new_state;
 268
 269         if (new_state) {
 270                 if (iface->autostart && !config_init)
 271                         interface_set_up(iface);
 272         } else
 273                 __interface_set_down(iface, true);
 274 }
 275
 276 void
 277 interface_add_user(struct interface_user *dep, struct interface *iface)
 278 {
 279         if (!iface) {
 280                 list_add(&dep->list, &iface_all_users);
 281                 return;
 282         }
 283
 284         dep->iface = iface;
 285         list_add(&dep->list, &iface->users);
 286         if (iface->state == IFS_UP)
 287                 dep->cb(dep, iface, IFEV_UP);
 288 }
 289
 290 void
 291 interface_remove_user(struct interface_user *dep)
 292 {
 293         list_del_init(&dep->list);
 294         dep->iface = NULL;
 295 }
 296
 297 static void
 298 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 299 {
 300         struct blob_attr *cur;
 301         int rem;
 302
 303         blobmsg_for_each_attr(cur, list, rem) {
 304                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 305                         continue;
 306
 307                 if (!blobmsg_check_attr(cur, NULL))
 308                         continue;
 309
 310                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 311                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 312                 list_add(&c->head, &iface->assignment_classes);
 313         }
 314 }
 315
 316 static void
 317 interface_clear_assignment_classes(struct interface *iface)
 318 {
 319         while (!list_empty(&iface->assignment_classes)) {
 320                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 321                                 struct interface_assignment_class, head);
 322                 list_del(&c->head);
 323                 free(c);
 324         }
 325 }
 326
 327 static void
 328 interface_merge_assignment_data(struct interface *old, struct interface *new)
 329 {
 330         bool changed = (old->assignment_hint != new->assignment_hint ||
 331                         old->assignment_length != new->assignment_length ||
 332                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 333
 334         struct interface_assignment_class *c;
 335         list_for_each_entry(c, &new->assignment_classes, head) {
 336                 // Compare list entries one-by-one to see if there was a change
 337                 if (list_empty(&old->assignment_classes)) // The new list is longer
 338                         changed = true;
 339
 340                 if (changed)
 341                         break;
 342
 343                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 344                                 struct interface_assignment_class, head);
 345
 346                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 347                         break;
 348
 349                 list_del(&c_old->head);
 350                 free(c_old);
 351         }
 352
 353         // The old list was longer than the new one or the last entry didn't match
 354         if (!list_empty(&old->assignment_classes)) {
 355                 interface_clear_assignment_classes(old);
 356                 changed = true;
 357         }
 358
 359         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 360
 361         if (changed) {
 362                 old->assignment_hint = new->assignment_hint;
 363                 old->assignment_length = new->assignment_length;
 364                 interface_refresh_assignments(true);
 365         }
 366 }
 367
 368 static void
 369 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 370 {
 371         struct interface *alias = container_of(dep, struct interface, parent_iface);
 372         struct device *dev = iface->l3_dev.dev;
 373
 374         switch (ev) {
 375         case IFEV_UP:
 376                 if (!dev)
 377                         return;
 378
 379                 interface_set_main_dev(alias, dev);
 380                 interface_set_available(alias, true);
 381                 break;
 382         case IFEV_DOWN:
 383                 interface_set_available(alias, false);
 384                 interface_set_main_dev(alias, NULL);
 385                 break;
 386         case IFEV_FREE:
 387                 interface_remove_user(dep);
 388                 break;
 389         case IFEV_RELOAD:
 390         case IFEV_UPDATE:
 391                 break;
 392         }
 393 }
 394
 395 static void
 396 interface_claim_device(struct interface *iface)
 397 {
 398         struct interface *parent;
 399         struct device *dev = NULL;
 400
 401         if (iface->parent_iface.iface)
 402                 interface_remove_user(&iface->parent_iface);
 403
 404         if (iface->parent_ifname) {
 405                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 406                 iface->parent_iface.cb = interface_alias_cb;
 407                 interface_add_user(&iface->parent_iface, parent);
 408         } else if (iface->ifname &&
 409                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 410                 dev = device_get(iface->ifname, true);
 411         }
 412
 413         if (dev)
 414                 interface_set_main_dev(iface, dev);
 415
 416         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 417                 interface_set_available(iface, true);
 418 }
 419
 420 static void
 421 interface_cleanup_state(struct interface *iface)
 422 {
 423         interface_set_available(iface, false);
 424
 425         interface_flush_state(iface);
 426         interface_clear_errors(iface);
 427         interface_set_proto_state(iface, NULL);
 428
 429         if (iface->main_dev.dev)
 430                 interface_set_main_dev(iface, NULL);
 431 }
 432
 433 static void
 434 interface_cleanup(struct interface *iface)
 435 {
 436         struct interface_user *dep, *tmp;
 437
 438         if (iface->parent_iface.iface)
 439                 interface_remove_user(&iface->parent_iface);
 440
 441         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 442                 interface_remove_user(dep);
 443
 444         interface_clear_assignment_classes(iface);
 445         interface_ip_flush(&iface->config_ip);
 446         interface_cleanup_state(iface);
 447 }
 448
 449 static void
 450 interface_do_free(struct interface *iface)
 451 {
 452         interface_event(iface, IFEV_FREE);
 453         interface_cleanup(iface);
 454         free(iface->config);
 455         netifd_ubus_remove_interface(iface);
 456         avl_delete(&interfaces.avl, &iface->node.avl);
 457         free(iface);
 458 }
 459
 460 static void
 461 interface_do_reload(struct interface *iface)
 462 {
 463         interface_event(iface, IFEV_RELOAD);
 464         interface_cleanup_state(iface);
 465         proto_init_interface(iface, iface->config);
 466         interface_claim_device(iface);
 467 }
 468
 469 static void
 470 interface_handle_config_change(struct interface *iface)
 471 {
 472         enum interface_config_state state = iface->config_state;
 473
 474         iface->config_state = IFC_NORMAL;
 475         switch(state) {
 476         case IFC_NORMAL:
 477                 break;
 478         case IFC_RELOAD:
 479                 interface_do_reload(iface);
 480                 break;
 481         case IFC_REMOVE:
 482                 interface_do_free(iface);
 483                 return;
 484         }
 485         if (iface->autostart && iface->available)
 486                 interface_set_up(iface);
 487 }
 488
 489 static void
 490 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 491 {
 492         struct interface *iface = state->iface;
 493
 494         switch (ev) {
 495         case IFPEV_UP:
 496                 if (iface->state != IFS_SETUP) {
 497                         interface_event(iface, IFEV_UPDATE);
 498                         return;
 499                 }
 500
 501                 interface_ip_set_enabled(&iface->config_ip, true);
 502                 system_flush_routes();
 503                 iface->state = IFS_UP;
 504                 iface->start_time = system_get_rtime();
 505                 interface_event(iface, IFEV_UP);
 506                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 507                 break;
 508         case IFPEV_DOWN:
 509                 if (iface->state == IFS_DOWN)
 510                         return;
 511
 512                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 513                 mark_interface_down(iface);
 514                 if (iface->main_dev.dev)
 515                         device_release(&iface->main_dev);
 516                 interface_handle_config_change(iface);
 517                 break;
 518         case IFPEV_LINK_LOST:
 519                 if (iface->state != IFS_UP)
 520                         return;
 521
 522                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 523                 mark_interface_down(iface);
 524                 iface->state = IFS_SETUP;
 525                 break;
 526         }
 527
 528         interface_write_resolv_conf();
 529 }
 530
 531 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 532 {
 533         if (iface->proto) {
 534                 iface->proto->free(iface->proto);
 535                 iface->proto = NULL;
 536         }
 537         iface->state = IFS_DOWN;
 538         iface->proto = state;
 539         if (!state)
 540                 return;
 541
 542         state->proto_event = interface_proto_cb;
 543         state->iface = iface;
 544 }
 545
 546 struct interface *
 547 interface_alloc(const char *name, struct blob_attr *config)
 548 {
 549         struct interface *iface;
 550         struct blob_attr *tb[IFACE_ATTR_MAX];
 551         struct blob_attr *cur;
 552         const char *proto_name = NULL;
 553         char *iface_name;
 554
 555         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 556         iface->name = strcpy(iface_name, name);
 557         INIT_LIST_HEAD(&iface->errors);
 558         INIT_LIST_HEAD(&iface->users);
 559         INIT_LIST_HEAD(&iface->hotplug_list);
 560         INIT_LIST_HEAD(&iface->assignment_classes);
 561         interface_ip_init(iface);
 562         avl_init(&iface->data, avl_strcmp, false, NULL);
 563         iface->config_ip.enabled = false;
 564
 565         iface->main_dev.cb = interface_cb;
 566
 567         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 568                       blob_data(config), blob_len(config));
 569
 570         if ((cur = tb[IFACE_ATTR_PROTO]))
 571                 proto_name = blobmsg_data(cur);
 572
 573         proto_attach_interface(iface, proto_name);
 574
 575         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 576         iface->proto_ip.no_defaultroute =
 577                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 578         iface->proto_ip.no_dns =
 579                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 580
 581         if ((cur = tb[IFACE_ATTR_DNS]))
 582                 interface_add_dns_server_list(&iface->config_ip, cur);
 583
 584         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 585                 interface_add_dns_search_list(&iface->config_ip, cur);
 586
 587         if ((cur = tb[IFACE_ATTR_METRIC]))
 588                 iface->metric = blobmsg_get_u32(cur);
 589
 590         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 591                 iface->assignment_length = blobmsg_get_u32(cur);
 592
 593         iface->assignment_hint = -1;
 594         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 595                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 596                                 ~((1 << (64 - iface->assignment_length)) - 1);
 597
 598         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 599                 interface_add_assignment_classes(iface, cur);
 600
 601
 602         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 603                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 604                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 605         }
 606
 607         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 608                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 609                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 610         }
 611
 612         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 613
 614         iface->config_autostart = iface->autostart;
 615         return iface;
 616 }
 617
 618 void interface_set_dynamic(struct interface *iface)
 619 {
 620         iface->dynamic = true;
 621         iface->node.version = -1; // Don't delete on reload
 622 }
 623
 624 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 625 {
 626         struct blob_attr *tb[IFACE_ATTR_MAX];
 627         struct blob_attr *cur;
 628
 629         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 630                       blob_data(config), blob_len(config));
 631
 632         if (alias) {
 633                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 634                         iface->parent_ifname = blobmsg_data(cur);
 635
 636                 if (!iface->parent_ifname)
 637                         return false;
 638         } else {
 639                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 640                         iface->ifname = blobmsg_data(cur);
 641         }
 642
 643
 644         iface->config = config;
 645         vlist_add(&interfaces, &iface->node, iface->name);
 646         return true;
 647 }
 648
 649 void
 650 interface_add(struct interface *iface, struct blob_attr *config)
 651 {
 652         __interface_add(iface, config, false);
 653 }
 654
 655 bool
 656 interface_add_alias(struct interface *iface, struct blob_attr *config)
 657 {
 658         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 659                 return false;
 660
 661         return __interface_add(iface, config, true);
 662 }
 663
 664 void
 665 interface_set_l3_dev(struct interface *iface, struct device *dev)
 666 {
 667         bool enabled = iface->config_ip.enabled;
 668         bool claimed = iface->l3_dev.claimed;
 669
 670         if (iface->l3_dev.dev == dev)
 671                 return;
 672
 673         interface_ip_set_enabled(&iface->config_ip, false);
 674         interface_ip_flush(&iface->proto_ip);
 675         device_add_user(&iface->l3_dev, dev);
 676
 677         if (dev) {
 678                 if (claimed)
 679                         device_claim(&iface->l3_dev);
 680                 interface_ip_set_enabled(&iface->config_ip, enabled);
 681         }
 682 }
 683
 684 void
 685 interface_set_main_dev(struct interface *iface, struct device *dev)
 686 {
 687         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 688         bool claimed = iface->l3_dev.claimed;
 689
 690         if (iface->main_dev.dev == dev)
 691                 return;
 692
 693         if (set_l3)
 694                 interface_set_l3_dev(iface, dev);
 695
 696         device_add_user(&iface->main_dev, dev);
 697         if (!dev)
 698                 return;
 699
 700         if (claimed)
 701                 device_claim(&iface->l3_dev);
 702
 703         if (!iface->l3_dev.dev)
 704                 interface_set_l3_dev(iface, dev);
 705 }
 706
 707 int
 708 interface_remove_link(struct interface *iface, struct device *dev)
 709 {
 710         struct device *mdev = iface->main_dev.dev;
 711
 712         if (mdev && mdev->hotplug_ops)
 713                 return mdev->hotplug_ops->del(mdev, dev);
 714
 715         if (!iface->main_dev.hotplug)
 716                 return UBUS_STATUS_INVALID_ARGUMENT;
 717
 718         if (dev != iface->main_dev.dev)
 719                 return UBUS_STATUS_INVALID_ARGUMENT;
 720
 721         device_remove_user(&iface->main_dev);
 722         return 0;
 723 }
 724
 725 int
 726 interface_add_link(struct interface *iface, struct device *dev)
 727 {
 728         struct device *mdev = iface->main_dev.dev;
 729
 730         if (mdev == dev)
 731                 return 0;
 732
 733         if (iface->main_dev.hotplug)
 734                 device_remove_user(&iface->main_dev);
 735
 736         if (mdev) {
 737                 if (mdev->hotplug_ops)
 738                         return mdev->hotplug_ops->add(mdev, dev);
 739                 else
 740                         return UBUS_STATUS_NOT_SUPPORTED;
 741         }
 742
 743         interface_set_main_dev(iface, dev);
 744         iface->main_dev.hotplug = true;
 745         return 0;
 746 }
 747
 748 int
 749 interface_handle_link(struct interface *iface, const char *name, bool add)
 750 {
 751         struct device *dev;
 752         int ret;
 753
 754         device_lock();
 755
 756         dev = device_get(name, add ? 2 : 0);
 757         if (!dev) {
 758                 ret = UBUS_STATUS_NOT_FOUND;
 759                 goto out;
 760         }
 761
 762         if (add) {
 763                 device_set_present(dev, true);
 764                 if (iface->device_config)
 765                         device_set_config(dev, &simple_device_type, iface->config);
 766
 767                 system_if_apply_settings(dev, &dev->settings);
 768                 ret = interface_add_link(iface, dev);
 769         } else {
 770                 ret = interface_remove_link(iface, dev);
 771         }
 772
 773 out:
 774         device_unlock();
 775
 776         return ret;
 777 }
 778
 779 int
 780 interface_set_up(struct interface *iface)
 781 {
 782         int ret;
 783
 784         iface->autostart = true;
 785
 786         if (iface->state != IFS_DOWN)
 787                 return 0;
 788
 789         interface_clear_errors(iface);
 790         if (!iface->available) {
 791                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 792                 return -1;
 793         }
 794
 795         if (iface->main_dev.dev) {
 796                 ret = device_claim(&iface->main_dev);
 797                 if (ret)
 798                         return ret;
 799         }
 800
 801         iface->state = IFS_SETUP;
 802         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 803         if (ret) {
 804                 mark_interface_down(iface);
 805                 return ret;
 806         }
 807
 808         return 0;
 809 }
 810
 811 int
 812 interface_set_down(struct interface *iface)
 813 {
 814         if (!iface) {
 815                 vlist_for_each_element(&interfaces, iface, node)
 816                         __interface_set_down(iface, false);
 817         } else {
 818                 iface->autostart = false;
 819                 __interface_set_down(iface, false);
 820         }
 821
 822         return 0;
 823 }
 824
 825 void
 826 interface_start_pending(void)
 827 {
 828         struct interface *iface;
 829
 830         vlist_for_each_element(&interfaces, iface, node) {
 831                 if (iface->available && iface->autostart)
 832                         interface_set_up(iface);
 833         }
 834 }
 835
 836 static void
 837 set_config_state(struct interface *iface, enum interface_config_state s)
 838 {
 839         iface->config_state = s;
 840         if (iface->state == IFS_DOWN)
 841                 interface_handle_config_change(iface);
 842         else
 843                 __interface_set_down(iface, false);
 844 }
 845
 846 void
 847 interface_update_start(struct interface *iface)
 848 {
 849         iface->updated = 0;
 850         interface_ip_update_start(&iface->proto_ip);
 851 }
 852
 853 void
 854 interface_update_complete(struct interface *iface)
 855 {
 856         interface_ip_update_complete(&iface->proto_ip);
 857 }
 858
 859 static void
 860 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 861 {
 862         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 863         vlist_simple_replace(&new->dns_search, &old->dns_search);
 864 }
 865
 866 static void
 867 interface_change_config(struct interface *if_old, struct interface *if_new)
 868 {
 869         struct blob_attr *old_config = if_old->config;
 870         bool reload = false, reload_ip = false;
 871
 872 #define FIELD_CHANGED_STR(field)                                        \
 873                 ((!!if_old->field != !!if_new->field) ||                \
 874                  (if_old->field &&                                      \
 875                   strcmp(if_old->field, if_new->field) != 0))
 876
 877         if (FIELD_CHANGED_STR(parent_ifname)) {
 878                 if (if_old->parent_iface.iface)
 879                         interface_remove_user(&if_old->parent_iface);
 880                 reload = true;
 881         }
 882
 883         if (FIELD_CHANGED_STR(ifname) ||
 884             if_old->proto_handler != if_new->proto_handler)
 885                 reload = true;
 886
 887         if (!if_old->proto_handler->config_params)
 888                 D(INTERFACE, "No config parameters for interface '%s'\n",
 889                   if_old->name);
 890         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 891                                        if_old->proto_handler->config_params))
 892                 reload = true;
 893
 894 #define UPDATE(field, __var) ({                                         \
 895                 bool __changed = (if_old->field != if_new->field);      \
 896                 if_old->field = if_new->field;                          \
 897                 __var |= __changed;                                     \
 898         })
 899
 900         if_old->config = if_new->config;
 901         if (!if_old->config_autostart && if_new->config_autostart)
 902                 if_old->autostart = true;
 903
 904         if_old->device_config = if_new->device_config;
 905         if_old->config_autostart = if_new->config_autostart;
 906         if_old->ifname = if_new->ifname;
 907         if_old->parent_ifname = if_new->parent_ifname;
 908         if_old->proto_handler = if_new->proto_handler;
 909
 910         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 911         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 912
 913         UPDATE(metric, reload_ip);
 914         UPDATE(proto_ip.no_defaultroute, reload_ip);
 915         UPDATE(ip4table, reload_ip);
 916         UPDATE(ip6table, reload_ip);
 917         interface_merge_assignment_data(if_old, if_new);
 918
 919 #undef UPDATE
 920
 921         if (reload) {
 922                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
 923                   if_old->name);
 924                 interface_clear_errors(if_old);
 925                 set_config_state(if_old, IFC_RELOAD);
 926                 goto out;
 927         }
 928
 929         if (reload_ip) {
 930                 interface_ip_set_enabled(&if_old->config_ip, false);
 931                 interface_ip_set_enabled(&if_old->proto_ip, false);
 932                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 933                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 934         }
 935
 936         interface_write_resolv_conf();
 937
 938 out:
 939         if_new->config = NULL;
 940         interface_cleanup(if_new);
 941         free(old_config);
 942         free(if_new);
 943 }
 944
 945 static void
 946 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 947                  struct vlist_node *node_old)
 948 {
 949         struct interface *if_old = container_of(node_old, struct interface, node);
 950         struct interface *if_new = container_of(node_new, struct interface, node);
 951
 952         if (node_old && node_new) {
 953                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 954                 interface_change_config(if_old, if_new);
 955         } else if (node_old) {
 956                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 957                 set_config_state(if_old, IFC_REMOVE);
 958         } else if (node_new) {
 959                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 960                 proto_init_interface(if_new, if_new->config);
 961                 interface_claim_device(if_new);
 962                 netifd_ubus_add_interface(if_new);
 963         }
 964 }
 965
 966
 967 static void __init
 968 interface_init_list(void)
 969 {
 970         vlist_init(&interfaces, avl_strcmp, interface_update);
 971         interfaces.keep_old = true;
 972         interfaces.no_delete = true;
 973 }