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         if (state == IFS_DOWN)
 211                 return;
 212
 213         iface->state = IFS_DOWN;
 214         if (state == IFS_UP)
 215                 interface_event(iface, IFEV_DOWN);
 216         interface_ip_set_enabled(&iface->config_ip, false);
 217         interface_ip_flush(&iface->proto_ip);
 218         interface_flush_state(iface);
 219         system_flush_routes();
 220 }
 221
 222 void
 223 __interface_set_down(struct interface *iface, bool force)
 224 {
 225         switch (iface->state) {
 226         case IFS_UP:
 227                 interface_event(iface, IFEV_DOWN);
 228         case IFS_SETUP:
 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                 break;
 237
 238         case IFS_DOWN:
 239                 if (iface->main_dev.dev)
 240                         device_release(&iface->main_dev);
 241         case IFS_TEARDOWN:
 242         default:
 243                 break;
 244         }
 245 }
 246
 247 static int
 248 __interface_set_up(struct interface *iface)
 249 {
 250         int ret;
 251
 252         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 253
 254         iface->state = IFS_SETUP;
 255         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 256         if (ret)
 257                 mark_interface_down(iface);
 258
 259         return ret;
 260 }
 261
 262 static void
 263 interface_check_state(struct interface *iface)
 264 {
 265         switch (iface->state) {
 266         case IFS_UP:
 267                 if (!iface->enabled || !iface->link_state) {
 268                         mark_interface_down(iface);
 269                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 270                 }
 271                 break;
 272         case IFS_DOWN:
 273                 if (iface->enabled && iface->link_state && !config_init)
 274                         __interface_set_up(iface);
 275                 break;
 276         default:
 277                 break;
 278         }
 279 }
 280
 281 static void
 282 interface_set_enabled(struct interface *iface, bool new_state)
 283 {
 284         if (iface->enabled == new_state)
 285                 return;
 286
 287         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 288         iface->enabled = new_state;
 289         interface_check_state(iface);
 290 }
 291
 292 static void
 293 interface_set_link_state(struct interface *iface, bool new_state)
 294 {
 295         if (iface->link_state == new_state)
 296                 return;
 297
 298         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 299         iface->link_state = new_state;
 300         interface_check_state(iface);
 301 }
 302
 303 static void
 304 interface_cb(struct device_user *dep, enum device_event ev)
 305 {
 306         struct interface *iface;
 307         bool new_state = false;
 308
 309         iface = container_of(dep, struct interface, main_dev);
 310         switch (ev) {
 311         case DEV_EVENT_ADD:
 312                 new_state = true;
 313         case DEV_EVENT_REMOVE:
 314                 interface_set_available(iface, new_state);
 315                 if (!new_state && dep->dev->external)
 316                         interface_set_main_dev(iface, NULL);
 317                 break;
 318         case DEV_EVENT_UP:
 319                 new_state = true;
 320         case DEV_EVENT_DOWN:
 321                 interface_set_enabled(iface, new_state);
 322                 break;
 323         case DEV_EVENT_LINK_UP:
 324                 new_state = true;
 325         case DEV_EVENT_LINK_DOWN:
 326                 interface_set_link_state(iface, new_state);
 327                 break;
 328         default:
 329                 break;
 330         }
 331 }
 332
 333 void
 334 interface_set_available(struct interface *iface, bool new_state)
 335 {
 336         if (iface->available == new_state)
 337                 return;
 338
 339         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 340         iface->available = new_state;
 341
 342         if (new_state) {
 343                 if (iface->autostart && !config_init)
 344                         interface_set_up(iface);
 345         } else
 346                 __interface_set_down(iface, true);
 347 }
 348
 349 void
 350 interface_add_user(struct interface_user *dep, struct interface *iface)
 351 {
 352         if (!iface) {
 353                 list_add(&dep->list, &iface_all_users);
 354                 return;
 355         }
 356
 357         dep->iface = iface;
 358         list_add(&dep->list, &iface->users);
 359         if (iface->state == IFS_UP)
 360                 dep->cb(dep, iface, IFEV_UP);
 361 }
 362
 363 void
 364 interface_remove_user(struct interface_user *dep)
 365 {
 366         list_del_init(&dep->list);
 367         dep->iface = NULL;
 368 }
 369
 370 static void
 371 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 372 {
 373         struct blob_attr *cur;
 374         int rem;
 375
 376         blobmsg_for_each_attr(cur, list, rem) {
 377                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 378                         continue;
 379
 380                 if (!blobmsg_check_attr(cur, NULL))
 381                         continue;
 382
 383                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 384                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 385                 list_add(&c->head, &iface->assignment_classes);
 386         }
 387 }
 388
 389 static void
 390 interface_clear_assignment_classes(struct interface *iface)
 391 {
 392         while (!list_empty(&iface->assignment_classes)) {
 393                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 394                                 struct interface_assignment_class, head);
 395                 list_del(&c->head);
 396                 free(c);
 397         }
 398 }
 399
 400 static void
 401 interface_merge_assignment_data(struct interface *old, struct interface *new)
 402 {
 403         bool changed = (old->assignment_hint != new->assignment_hint ||
 404                         old->assignment_length != new->assignment_length ||
 405                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 406
 407         struct interface_assignment_class *c;
 408         list_for_each_entry(c, &new->assignment_classes, head) {
 409                 // Compare list entries one-by-one to see if there was a change
 410                 if (list_empty(&old->assignment_classes)) // The new list is longer
 411                         changed = true;
 412
 413                 if (changed)
 414                         break;
 415
 416                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 417                                 struct interface_assignment_class, head);
 418
 419                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 420                         break;
 421
 422                 list_del(&c_old->head);
 423                 free(c_old);
 424         }
 425
 426         // The old list was longer than the new one or the last entry didn't match
 427         if (!list_empty(&old->assignment_classes)) {
 428                 interface_clear_assignment_classes(old);
 429                 changed = true;
 430         }
 431
 432         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 433
 434         if (changed) {
 435                 old->assignment_hint = new->assignment_hint;
 436                 old->assignment_length = new->assignment_length;
 437                 interface_refresh_assignments(true);
 438         }
 439 }
 440
 441 static void
 442 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 443 {
 444         struct interface *alias = container_of(dep, struct interface, parent_iface);
 445         struct device *dev = iface->l3_dev.dev;
 446
 447         switch (ev) {
 448         case IFEV_UP:
 449                 if (!dev)
 450                         return;
 451
 452                 interface_set_main_dev(alias, dev);
 453                 interface_set_available(alias, true);
 454                 break;
 455         case IFEV_DOWN:
 456                 interface_set_available(alias, false);
 457                 interface_set_main_dev(alias, NULL);
 458                 break;
 459         case IFEV_FREE:
 460                 interface_remove_user(dep);
 461                 break;
 462         case IFEV_RELOAD:
 463         case IFEV_UPDATE:
 464                 break;
 465         }
 466 }
 467
 468 static void
 469 interface_claim_device(struct interface *iface)
 470 {
 471         struct interface *parent;
 472         struct device *dev = NULL;
 473
 474         if (iface->parent_iface.iface)
 475                 interface_remove_user(&iface->parent_iface);
 476
 477         if (iface->parent_ifname) {
 478                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 479                 iface->parent_iface.cb = interface_alias_cb;
 480                 interface_add_user(&iface->parent_iface, parent);
 481         } else if (iface->ifname &&
 482                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 483                 dev = device_get(iface->ifname, true);
 484         }
 485
 486         if (dev)
 487                 interface_set_main_dev(iface, dev);
 488
 489         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 490                 interface_set_available(iface, true);
 491 }
 492
 493 static void
 494 interface_cleanup_state(struct interface *iface)
 495 {
 496         interface_set_available(iface, false);
 497
 498         interface_flush_state(iface);
 499         interface_clear_errors(iface);
 500         interface_set_proto_state(iface, NULL);
 501
 502         if (iface->main_dev.dev)
 503                 interface_set_main_dev(iface, NULL);
 504 }
 505
 506 static void
 507 interface_cleanup(struct interface *iface)
 508 {
 509         struct interface_user *dep, *tmp;
 510
 511         if (iface->parent_iface.iface)
 512                 interface_remove_user(&iface->parent_iface);
 513
 514         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 515                 interface_remove_user(dep);
 516
 517         interface_clear_assignment_classes(iface);
 518         interface_ip_flush(&iface->config_ip);
 519         interface_cleanup_state(iface);
 520 }
 521
 522 static void
 523 interface_do_free(struct interface *iface)
 524 {
 525         interface_event(iface, IFEV_FREE);
 526         interface_cleanup(iface);
 527         free(iface->config);
 528         netifd_ubus_remove_interface(iface);
 529         avl_delete(&interfaces.avl, &iface->node.avl);
 530         free(iface);
 531 }
 532
 533 static void
 534 interface_do_reload(struct interface *iface)
 535 {
 536         interface_event(iface, IFEV_RELOAD);
 537         interface_cleanup_state(iface);
 538         proto_init_interface(iface, iface->config);
 539         interface_claim_device(iface);
 540 }
 541
 542 static void
 543 interface_handle_config_change(struct interface *iface)
 544 {
 545         enum interface_config_state state = iface->config_state;
 546
 547         iface->config_state = IFC_NORMAL;
 548         switch(state) {
 549         case IFC_NORMAL:
 550                 break;
 551         case IFC_RELOAD:
 552                 interface_do_reload(iface);
 553                 break;
 554         case IFC_REMOVE:
 555                 interface_do_free(iface);
 556                 return;
 557         }
 558         if (iface->autostart && iface->available)
 559                 interface_set_up(iface);
 560 }
 561
 562 static void
 563 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 564 {
 565         struct interface *iface = state->iface;
 566
 567         switch (ev) {
 568         case IFPEV_UP:
 569                 if (iface->state != IFS_SETUP) {
 570                         interface_event(iface, IFEV_UPDATE);
 571                         return;
 572                 }
 573
 574                 interface_ip_set_enabled(&iface->config_ip, true);
 575                 system_flush_routes();
 576                 iface->state = IFS_UP;
 577                 iface->start_time = system_get_rtime();
 578                 interface_event(iface, IFEV_UP);
 579                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 580                 break;
 581         case IFPEV_DOWN:
 582                 if (iface->state == IFS_DOWN)
 583                         return;
 584
 585                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 586                 mark_interface_down(iface);
 587                 if (iface->main_dev.dev)
 588                         device_release(&iface->main_dev);
 589                 interface_handle_config_change(iface);
 590                 break;
 591         case IFPEV_LINK_LOST:
 592                 if (iface->state != IFS_UP)
 593                         return;
 594
 595                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 596                 mark_interface_down(iface);
 597                 iface->state = IFS_SETUP;
 598                 break;
 599         }
 600
 601         interface_write_resolv_conf();
 602 }
 603
 604 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 605 {
 606         if (iface->proto) {
 607                 iface->proto->free(iface->proto);
 608                 iface->proto = NULL;
 609         }
 610         iface->state = IFS_DOWN;
 611         iface->proto = state;
 612         if (!state)
 613                 return;
 614
 615         state->proto_event = interface_proto_cb;
 616         state->iface = iface;
 617 }
 618
 619 struct interface *
 620 interface_alloc(const char *name, struct blob_attr *config)
 621 {
 622         struct interface *iface;
 623         struct blob_attr *tb[IFACE_ATTR_MAX];
 624         struct blob_attr *cur;
 625         const char *proto_name = NULL;
 626         char *iface_name;
 627
 628         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 629         iface->name = strcpy(iface_name, name);
 630         INIT_LIST_HEAD(&iface->errors);
 631         INIT_LIST_HEAD(&iface->users);
 632         INIT_LIST_HEAD(&iface->hotplug_list);
 633         INIT_LIST_HEAD(&iface->assignment_classes);
 634         interface_ip_init(iface);
 635         avl_init(&iface->data, avl_strcmp, false, NULL);
 636         iface->config_ip.enabled = false;
 637
 638         iface->main_dev.cb = interface_cb;
 639
 640         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 641                       blob_data(config), blob_len(config));
 642
 643         if ((cur = tb[IFACE_ATTR_PROTO]))
 644                 proto_name = blobmsg_data(cur);
 645
 646         proto_attach_interface(iface, proto_name);
 647
 648         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 649         iface->proto_ip.no_defaultroute =
 650                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 651         iface->proto_ip.no_dns =
 652                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 653
 654         if ((cur = tb[IFACE_ATTR_DNS]))
 655                 interface_add_dns_server_list(&iface->config_ip, cur);
 656
 657         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 658                 interface_add_dns_search_list(&iface->config_ip, cur);
 659
 660         if ((cur = tb[IFACE_ATTR_METRIC]))
 661                 iface->metric = blobmsg_get_u32(cur);
 662
 663         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 664                 iface->assignment_length = blobmsg_get_u32(cur);
 665
 666         iface->assignment_hint = -1;
 667         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 668                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 669                                 ~((1 << (64 - iface->assignment_length)) - 1);
 670
 671         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 672                 interface_add_assignment_classes(iface, cur);
 673
 674
 675         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 676                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 677                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 678         }
 679
 680         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 681                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 682                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 683         }
 684
 685         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 686
 687         iface->config_autostart = iface->autostart;
 688         return iface;
 689 }
 690
 691 void interface_set_dynamic(struct interface *iface)
 692 {
 693         iface->dynamic = true;
 694         iface->node.version = -1; // Don't delete on reload
 695 }
 696
 697 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 698 {
 699         struct blob_attr *tb[IFACE_ATTR_MAX];
 700         struct blob_attr *cur;
 701
 702         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 703                       blob_data(config), blob_len(config));
 704
 705         if (alias) {
 706                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 707                         iface->parent_ifname = blobmsg_data(cur);
 708
 709                 if (!iface->parent_ifname)
 710                         return false;
 711         } else {
 712                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 713                         iface->ifname = blobmsg_data(cur);
 714         }
 715
 716
 717         iface->config = config;
 718         vlist_add(&interfaces, &iface->node, iface->name);
 719         return true;
 720 }
 721
 722 void
 723 interface_add(struct interface *iface, struct blob_attr *config)
 724 {
 725         __interface_add(iface, config, false);
 726 }
 727
 728 bool
 729 interface_add_alias(struct interface *iface, struct blob_attr *config)
 730 {
 731         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 732                 return false;
 733
 734         return __interface_add(iface, config, true);
 735 }
 736
 737 void
 738 interface_set_l3_dev(struct interface *iface, struct device *dev)
 739 {
 740         bool enabled = iface->config_ip.enabled;
 741         bool claimed = iface->l3_dev.claimed;
 742
 743         if (iface->l3_dev.dev == dev)
 744                 return;
 745
 746         interface_ip_set_enabled(&iface->config_ip, false);
 747         interface_ip_flush(&iface->proto_ip);
 748         device_add_user(&iface->l3_dev, dev);
 749
 750         if (dev) {
 751                 if (claimed)
 752                         device_claim(&iface->l3_dev);
 753                 interface_ip_set_enabled(&iface->config_ip, enabled);
 754         }
 755 }
 756
 757 void
 758 interface_set_main_dev(struct interface *iface, struct device *dev)
 759 {
 760         bool set_l3 = (!dev || iface->main_dev.dev == iface->l3_dev.dev);
 761         bool claimed = iface->l3_dev.claimed;
 762
 763         if (iface->main_dev.dev == dev)
 764                 return;
 765
 766         if (set_l3)
 767                 interface_set_l3_dev(iface, dev);
 768
 769         device_add_user(&iface->main_dev, dev);
 770         if (!dev) {
 771                 interface_set_link_state(iface, false);
 772                 return;
 773         }
 774
 775         if (claimed)
 776                 device_claim(&iface->l3_dev);
 777
 778         if (!iface->l3_dev.dev)
 779                 interface_set_l3_dev(iface, dev);
 780 }
 781
 782 int
 783 interface_remove_link(struct interface *iface, struct device *dev)
 784 {
 785         struct device *mdev = iface->main_dev.dev;
 786
 787         if (mdev && mdev->hotplug_ops)
 788                 return mdev->hotplug_ops->del(mdev, dev);
 789
 790         if (!iface->main_dev.hotplug)
 791                 return UBUS_STATUS_INVALID_ARGUMENT;
 792
 793         if (dev != iface->main_dev.dev)
 794                 return UBUS_STATUS_INVALID_ARGUMENT;
 795
 796         device_remove_user(&iface->main_dev);
 797         return 0;
 798 }
 799
 800 int
 801 interface_add_link(struct interface *iface, struct device *dev)
 802 {
 803         struct device *mdev = iface->main_dev.dev;
 804
 805         if (mdev == dev)
 806                 return 0;
 807
 808         if (iface->main_dev.hotplug)
 809                 device_remove_user(&iface->main_dev);
 810
 811         if (mdev) {
 812                 if (mdev->hotplug_ops)
 813                         return mdev->hotplug_ops->add(mdev, dev);
 814                 else
 815                         return UBUS_STATUS_NOT_SUPPORTED;
 816         }
 817
 818         interface_set_main_dev(iface, dev);
 819         iface->main_dev.hotplug = true;
 820         return 0;
 821 }
 822
 823 int
 824 interface_handle_link(struct interface *iface, const char *name, bool add)
 825 {
 826         struct device *dev;
 827         int ret;
 828
 829         device_lock();
 830
 831         dev = device_get(name, add ? 2 : 0);
 832         if (!dev) {
 833                 ret = UBUS_STATUS_NOT_FOUND;
 834                 goto out;
 835         }
 836
 837         if (add) {
 838                 device_set_present(dev, true);
 839                 if (iface->device_config)
 840                         device_set_config(dev, &simple_device_type, iface->config);
 841
 842                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 843                 ret = interface_add_link(iface, dev);
 844         } else {
 845                 ret = interface_remove_link(iface, dev);
 846         }
 847
 848 out:
 849         device_unlock();
 850
 851         return ret;
 852 }
 853
 854 int
 855 interface_set_up(struct interface *iface)
 856 {
 857         int ret;
 858
 859         iface->autostart = true;
 860
 861         if (iface->state != IFS_DOWN)
 862                 return 0;
 863
 864         interface_clear_errors(iface);
 865         if (!iface->available) {
 866                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 867                 return -1;
 868         }
 869
 870         if (iface->main_dev.dev) {
 871                 ret = device_claim(&iface->main_dev);
 872                 if (!ret)
 873                         interface_check_state(iface);
 874         }
 875         else
 876                 ret = __interface_set_up(iface);
 877
 878         return ret;
 879 }
 880
 881 int
 882 interface_set_down(struct interface *iface)
 883 {
 884         if (!iface) {
 885                 vlist_for_each_element(&interfaces, iface, node)
 886                         __interface_set_down(iface, false);
 887         } else {
 888                 iface->autostart = false;
 889                 __interface_set_down(iface, false);
 890         }
 891
 892         return 0;
 893 }
 894
 895 void
 896 interface_start_pending(void)
 897 {
 898         struct interface *iface;
 899
 900         vlist_for_each_element(&interfaces, iface, node) {
 901                 if (iface->available && iface->autostart)
 902                         interface_set_up(iface);
 903         }
 904 }
 905
 906 static void
 907 set_config_state(struct interface *iface, enum interface_config_state s)
 908 {
 909         iface->config_state = s;
 910         if (iface->state == IFS_DOWN)
 911                 interface_handle_config_change(iface);
 912         else
 913                 __interface_set_down(iface, false);
 914 }
 915
 916 void
 917 interface_update_start(struct interface *iface)
 918 {
 919         iface->updated = 0;
 920         interface_ip_update_start(&iface->proto_ip);
 921 }
 922
 923 void
 924 interface_update_complete(struct interface *iface)
 925 {
 926         interface_ip_update_complete(&iface->proto_ip);
 927 }
 928
 929 static void
 930 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 931 {
 932         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 933         vlist_simple_replace(&new->dns_search, &old->dns_search);
 934 }
 935
 936 static void
 937 interface_change_config(struct interface *if_old, struct interface *if_new)
 938 {
 939         struct blob_attr *old_config = if_old->config;
 940         bool reload = false, reload_ip = false;
 941
 942 #define FIELD_CHANGED_STR(field)                                        \
 943                 ((!!if_old->field != !!if_new->field) ||                \
 944                  (if_old->field &&                                      \
 945                   strcmp(if_old->field, if_new->field) != 0))
 946
 947         if (FIELD_CHANGED_STR(parent_ifname)) {
 948                 if (if_old->parent_iface.iface)
 949                         interface_remove_user(&if_old->parent_iface);
 950                 reload = true;
 951         }
 952
 953         if (FIELD_CHANGED_STR(ifname) ||
 954             if_old->proto_handler != if_new->proto_handler)
 955                 reload = true;
 956
 957         if (!if_old->proto_handler->config_params)
 958                 D(INTERFACE, "No config parameters for interface '%s'\n",
 959                   if_old->name);
 960         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 961                                        if_old->proto_handler->config_params))
 962                 reload = true;
 963
 964 #define UPDATE(field, __var) ({                                         \
 965                 bool __changed = (if_old->field != if_new->field);      \
 966                 if_old->field = if_new->field;                          \
 967                 __var |= __changed;                                     \
 968         })
 969
 970         if_old->config = if_new->config;
 971         if (!if_old->config_autostart && if_new->config_autostart)
 972                 if_old->autostart = true;
 973
 974         if_old->device_config = if_new->device_config;
 975         if_old->config_autostart = if_new->config_autostart;
 976         if_old->ifname = if_new->ifname;
 977         if_old->parent_ifname = if_new->parent_ifname;
 978         if_old->proto_handler = if_new->proto_handler;
 979
 980         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 981         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 982
 983         UPDATE(metric, reload_ip);
 984         UPDATE(proto_ip.no_defaultroute, reload_ip);
 985         UPDATE(ip4table, reload_ip);
 986         UPDATE(ip6table, reload_ip);
 987         interface_merge_assignment_data(if_old, if_new);
 988
 989 #undef UPDATE
 990
 991         if (reload) {
 992                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
 993                   if_old->name);
 994                 interface_clear_errors(if_old);
 995                 set_config_state(if_old, IFC_RELOAD);
 996                 goto out;
 997         }
 998
 999         if (reload_ip) {
1000                 interface_ip_set_enabled(&if_old->config_ip, false);
1001                 interface_ip_set_enabled(&if_old->proto_ip, false);
1002                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1003                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1004         }
1005
1006         interface_write_resolv_conf();
1007
1008 out:
1009         if_new->config = NULL;
1010         interface_cleanup(if_new);
1011         free(old_config);
1012         free(if_new);
1013 }
1014
1015 static void
1016 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1017                  struct vlist_node *node_old)
1018 {
1019         struct interface *if_old = container_of(node_old, struct interface, node);
1020         struct interface *if_new = container_of(node_new, struct interface, node);
1021
1022         if (node_old && node_new) {
1023                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1024                 interface_change_config(if_old, if_new);
1025         } else if (node_old) {
1026                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1027                 set_config_state(if_old, IFC_REMOVE);
1028         } else if (node_new) {
1029                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1030                 proto_init_interface(if_new, if_new->config);
1031                 interface_claim_device(if_new);
1032                 netifd_ubus_add_interface(if_new);
1033         }
1034 }
1035
1036
1037 static void __init
1038 interface_init_list(void)
1039 {
1040         vlist_init(&interfaces, avl_strcmp, interface_update);
1041         interfaces.keep_old = true;
1042         interfaces.no_delete = true;
1043 }