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_DNS_METRIC,
  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_IP6IFACEID,
  48         IFACE_ATTR_FORCE_LINK,
  49         IFACE_ATTR_IP6WEIGHT,
  50         IFACE_ATTR_MAX
  51 };
  52
  53 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  54         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  55         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  56         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  58         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  59         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  60         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  61         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  62         [IFACE_ATTR_DNS_METRIC] = { .name = "dns_metric", .type = BLOBMSG_TYPE_INT32 },
  63         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  65         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  69         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  70         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  71         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  72         [IFACE_ATTR_IP6WEIGHT] = { .name = "ip6weight", .type = BLOBMSG_TYPE_INT32 },
  73 };
  74
  75 const struct uci_blob_param_list interface_attr_list = {
  76         .n_params = IFACE_ATTR_MAX,
  77         .params = iface_attrs,
  78 };
  79
  80 static void
  81 set_config_state(struct interface *iface, enum interface_config_state s);
  82 static void
  83 interface_event(struct interface *iface, enum interface_event ev);
  84
  85 static void
  86 interface_error_flush(struct interface *iface)
  87 {
  88         struct interface_error *error, *tmp;
  89
  90         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  91                 list_del(&error->list);
  92                 free(error);
  93         }
  94 }
  95
  96 static void
  97 interface_clear_errors(struct interface *iface)
  98 {
  99         /* don't flush the errors in case the configured protocol handler matches the
 100            running protocol handler and is having the last error capability */
 101         if (!(iface->proto &&
 102               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 103               (iface->proto->handler->name == iface->proto_handler->name)))
 104                 interface_error_flush(iface);
 105 }
 106
 107 void interface_add_error(struct interface *iface, const char *subsystem,
 108                          const char *code, const char **data, int n_data)
 109 {
 110         struct interface_error *error;
 111         int i, len = 0;
 112         int *datalen = NULL;
 113         char *dest, *d_subsys, *d_code;
 114
 115         /* if the configured protocol handler has the last error support capability,
 116            errors should only be added if the running protocol handler matches the
 117            configured one */
 118         if (iface->proto &&
 119             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 120             (iface->proto->handler->name != iface->proto_handler->name))
 121                 return;
 122
 123         if (n_data) {
 124                 len = n_data * sizeof(char *);
 125                 datalen = alloca(len);
 126                 for (i = 0; i < n_data; i++) {
 127                         datalen[i] = strlen(data[i]) + 1;
 128                         len += datalen[i];
 129                 }
 130         }
 131
 132         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 133                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 134                 &d_code, code ? strlen(code) + 1 : 0);
 135         if (!error)
 136                 return;
 137
 138         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 139            protocol can't be established (e.g auth failure) */
 140         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 141                 interface_error_flush(iface);
 142
 143         list_add_tail(&error->list, &iface->errors);
 144
 145         dest = (char *) &error->data[n_data + 1];
 146         for (i = 0; i < n_data; i++) {
 147                 error->data[i] = dest;
 148                 memcpy(dest, data[i], datalen[i]);
 149                 dest += datalen[i];
 150         }
 151         error->data[n_data] = NULL;
 152
 153         if (subsystem)
 154                 error->subsystem = strcpy(d_subsys, subsystem);
 155
 156         if (code)
 157                 error->code = strcpy(d_code, code);
 158 }
 159
 160 static void
 161 interface_data_del(struct interface *iface, struct interface_data *data)
 162 {
 163         avl_delete(&iface->data, &data->node);
 164         free(data);
 165 }
 166
 167 static void
 168 interface_data_flush(struct interface *iface)
 169 {
 170         struct interface_data *d, *tmp;
 171
 172         avl_for_each_element_safe(&iface->data, d, node, tmp)
 173                 interface_data_del(iface, d);
 174 }
 175
 176 int
 177 interface_add_data(struct interface *iface, const struct blob_attr *data)
 178 {
 179         struct interface_data *n, *o;
 180
 181         if (!blobmsg_check_attr(data, true))
 182                 return UBUS_STATUS_INVALID_ARGUMENT;
 183
 184         const char *name = blobmsg_name(data);
 185         unsigned len = blob_pad_len(data);
 186
 187         o = avl_find_element(&iface->data, name, o, node);
 188         if (o) {
 189                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 190                         return 0;
 191
 192                 interface_data_del(iface, o);
 193         }
 194
 195         n = calloc(1, sizeof(*n) + len);
 196         if (!n)
 197                 return UBUS_STATUS_UNKNOWN_ERROR;
 198
 199         memcpy(n->data, data, len);
 200         n->node.key = blobmsg_name(n->data);
 201         avl_insert(&iface->data, &n->node);
 202
 203         iface->updated |= IUF_DATA;
 204         return 0;
 205 }
 206
 207 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 208 {
 209         struct blob_attr *cur;
 210         int rem, ret;
 211
 212         iface->updated = 0;
 213
 214         blob_for_each_attr(cur, attr, rem) {
 215                 ret = interface_add_data(iface, cur);
 216                 if (ret)
 217                         return ret;
 218         }
 219
 220         if (iface->updated && iface->state == IFS_UP)
 221                 interface_event(iface, IFEV_UPDATE);
 222
 223         return 0;
 224 }
 225
 226 static void
 227 interface_event(struct interface *iface, enum interface_event ev)
 228 {
 229         struct interface_user *dep, *tmp;
 230         struct device *adev = NULL;
 231
 232         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 233                 dep->cb(dep, iface, ev);
 234
 235         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 236                 dep->cb(dep, iface, ev);
 237
 238         switch (ev) {
 239         case IFEV_UP:
 240                 interface_error_flush(iface);
 241                 adev = iface->l3_dev.dev;
 242                 /* fall through */
 243         case IFEV_DOWN:
 244         case IFEV_UP_FAILED:
 245                 alias_notify_device(iface->name, adev);
 246                 break;
 247         default:
 248                 break;
 249         }
 250 }
 251
 252 static void
 253 interface_flush_state(struct interface *iface)
 254 {
 255         if (iface->l3_dev.dev)
 256                 device_release(&iface->l3_dev);
 257         interface_data_flush(iface);
 258 }
 259
 260 static void
 261 mark_interface_down(struct interface *iface)
 262 {
 263         enum interface_state state = iface->state;
 264
 265         if (state == IFS_DOWN)
 266                 return;
 267
 268         iface->link_up_event = false;
 269         iface->state = IFS_DOWN;
 270         switch (state) {
 271         case IFS_UP:
 272                 interface_event(iface, IFEV_DOWN);
 273                 break;
 274         case IFS_SETUP:
 275                 interface_event(iface, IFEV_UP_FAILED);
 276                 break;
 277         default:
 278                 break;
 279         }
 280         interface_ip_set_enabled(&iface->config_ip, false);
 281         interface_ip_set_enabled(&iface->proto_ip, false);
 282         interface_ip_flush(&iface->proto_ip);
 283         interface_flush_state(iface);
 284         system_flush_routes();
 285 }
 286
 287 void
 288 __interface_set_down(struct interface *iface, bool force)
 289 {
 290         enum interface_state state = iface->state;
 291         switch (state) {
 292         case IFS_UP:
 293         case IFS_SETUP:
 294                 iface->state = IFS_TEARDOWN;
 295                 if (state == IFS_UP)
 296                         interface_event(iface, IFEV_DOWN);
 297
 298                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 299                 if (force)
 300                         interface_flush_state(iface);
 301                 break;
 302
 303         case IFS_DOWN:
 304                 if (iface->main_dev.dev)
 305                         device_release(&iface->main_dev);
 306         case IFS_TEARDOWN:
 307         default:
 308                 break;
 309         }
 310 }
 311
 312 static int
 313 __interface_set_up(struct interface *iface)
 314 {
 315         int ret;
 316
 317         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 318
 319         iface->state = IFS_SETUP;
 320         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 321         if (ret)
 322                 mark_interface_down(iface);
 323
 324         return ret;
 325 }
 326
 327 static void
 328 interface_check_state(struct interface *iface)
 329 {
 330         bool link_state = iface->link_state || iface->force_link;
 331
 332         switch (iface->state) {
 333         case IFS_UP:
 334         case IFS_SETUP:
 335                 if (!iface->enabled || !link_state) {
 336                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 337                         mark_interface_down(iface);
 338                 }
 339                 break;
 340         case IFS_DOWN:
 341                 if (!iface->available)
 342                         return;
 343
 344                 if (iface->autostart && iface->enabled && link_state && !config_init)
 345                         __interface_set_up(iface);
 346                 break;
 347         default:
 348                 break;
 349         }
 350 }
 351
 352 static void
 353 interface_set_enabled(struct interface *iface, bool new_state)
 354 {
 355         if (iface->enabled == new_state)
 356                 return;
 357
 358         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 359         iface->enabled = new_state;
 360         interface_check_state(iface);
 361 }
 362
 363 static void
 364 interface_set_link_state(struct interface *iface, bool new_state)
 365 {
 366         if (iface->link_state == new_state)
 367                 return;
 368
 369         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 370         iface->link_state = new_state;
 371         interface_check_state(iface);
 372
 373         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 374                 interface_event(iface, IFEV_LINK_UP);
 375                 iface->link_up_event = true;
 376         }
 377 }
 378
 379 static void
 380 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 381 {
 382         if (ev == DEV_EVENT_REMOVE)
 383                 device_remove_user(dep);
 384 }
 385
 386 static void
 387 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 388 {
 389         struct interface *iface;
 390         bool new_state = false;
 391
 392         iface = container_of(dep, struct interface, main_dev);
 393         switch (ev) {
 394         case DEV_EVENT_ADD:
 395                 new_state = true;
 396         case DEV_EVENT_REMOVE:
 397                 interface_set_available(iface, new_state);
 398                 if (!new_state && dep->dev && dep->dev->external)
 399                         interface_set_main_dev(iface, NULL);
 400                 break;
 401         case DEV_EVENT_UP:
 402                 new_state = true;
 403         case DEV_EVENT_DOWN:
 404                 interface_set_enabled(iface, new_state);
 405                 break;
 406         case DEV_EVENT_LINK_UP:
 407                 new_state = true;
 408         case DEV_EVENT_LINK_DOWN:
 409                 interface_set_link_state(iface, new_state);
 410                 break;
 411         case DEV_EVENT_TOPO_CHANGE:
 412                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 413                 return;
 414         default:
 415                 break;
 416         }
 417 }
 418
 419 static void
 420 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 421 {
 422         struct interface *iface;
 423
 424         iface = container_of(dep, struct interface, l3_dev);
 425         if (iface->l3_dev.dev == iface->main_dev.dev)
 426                 return;
 427
 428         switch (ev) {
 429         case DEV_EVENT_LINK_DOWN:
 430                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 431                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 432                 break;
 433         default:
 434                 break;
 435         }
 436 }
 437
 438 void
 439 interface_set_available(struct interface *iface, bool new_state)
 440 {
 441         if (iface->available == new_state)
 442                 return;
 443
 444         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 445         iface->available = new_state;
 446
 447         if (new_state) {
 448                 if (iface->autostart && !config_init)
 449                         interface_set_up(iface);
 450         } else
 451                 __interface_set_down(iface, true);
 452 }
 453
 454 void
 455 interface_add_user(struct interface_user *dep, struct interface *iface)
 456 {
 457         if (!iface) {
 458                 list_add(&dep->list, &iface_all_users);
 459                 return;
 460         }
 461
 462         dep->iface = iface;
 463         list_add(&dep->list, &iface->users);
 464         if (iface->state == IFS_UP)
 465                 dep->cb(dep, iface, IFEV_UP);
 466 }
 467
 468 void
 469 interface_remove_user(struct interface_user *dep)
 470 {
 471         list_del_init(&dep->list);
 472         dep->iface = NULL;
 473 }
 474
 475 static void
 476 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 477 {
 478         struct blob_attr *cur;
 479         int rem;
 480
 481         blobmsg_for_each_attr(cur, list, rem) {
 482                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 483                         continue;
 484
 485                 if (!blobmsg_check_attr(cur, NULL))
 486                         continue;
 487
 488                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 489                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 490                 list_add(&c->head, &iface->assignment_classes);
 491         }
 492 }
 493
 494 static void
 495 interface_clear_assignment_classes(struct interface *iface)
 496 {
 497         while (!list_empty(&iface->assignment_classes)) {
 498                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 499                                 struct interface_assignment_class, head);
 500                 list_del(&c->head);
 501                 free(c);
 502         }
 503 }
 504
 505 static void
 506 interface_merge_assignment_data(struct interface *old, struct interface *new)
 507 {
 508         bool changed = (old->assignment_hint != new->assignment_hint ||
 509                         old->assignment_length != new->assignment_length ||
 510                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 511                         old->assignment_weight != new->assignment_weight ||
 512                         (old->assignment_iface_id_selection == IFID_FIXED &&
 513                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 514                                 sizeof(old->assignment_fixed_iface_id))) ||
 515                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 516
 517         struct interface_assignment_class *c;
 518         list_for_each_entry(c, &new->assignment_classes, head) {
 519                 // Compare list entries one-by-one to see if there was a change
 520                 if (list_empty(&old->assignment_classes)) // The new list is longer
 521                         changed = true;
 522
 523                 if (changed)
 524                         break;
 525
 526                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 527                                 struct interface_assignment_class, head);
 528
 529                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 530                         break;
 531
 532                 list_del(&c_old->head);
 533                 free(c_old);
 534         }
 535
 536         // The old list was longer than the new one or the last entry didn't match
 537         if (!list_empty(&old->assignment_classes)) {
 538                 interface_clear_assignment_classes(old);
 539                 changed = true;
 540         }
 541
 542         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 543
 544         if (changed) {
 545                 old->assignment_hint = new->assignment_hint;
 546                 old->assignment_length = new->assignment_length;
 547                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 548                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 549                 old->assignment_weight = new->assignment_weight;
 550                 interface_refresh_assignments(true);
 551         }
 552 }
 553
 554 static void
 555 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 556 {
 557         struct interface *alias = container_of(dep, struct interface, parent_iface);
 558         struct device *dev = iface->l3_dev.dev;
 559
 560         switch (ev) {
 561         case IFEV_UP:
 562                 if (!dev)
 563                         return;
 564
 565                 interface_set_main_dev(alias, dev);
 566                 interface_set_available(alias, true);
 567                 break;
 568         case IFEV_DOWN:
 569         case IFEV_UP_FAILED:
 570                 interface_set_available(alias, false);
 571                 interface_set_main_dev(alias, NULL);
 572                 break;
 573         case IFEV_FREE:
 574                 interface_remove_user(dep);
 575                 break;
 576         default:
 577                 break;
 578         }
 579 }
 580
 581 static void
 582 interface_set_device_config(struct interface *iface, struct device *dev)
 583 {
 584         if (!dev || !dev->default_config)
 585                 return;
 586
 587         if (!iface->device_config &&
 588             (!dev->iface_config || dev->config_iface != iface))
 589                 return;
 590
 591         dev->config_iface = iface;
 592         dev->iface_config = iface->device_config;
 593         device_apply_config(dev, dev->type, iface->config);
 594 }
 595
 596 static void
 597 interface_claim_device(struct interface *iface)
 598 {
 599         struct interface *parent;
 600         struct device *dev = NULL;
 601
 602         if (iface->parent_iface.iface)
 603                 interface_remove_user(&iface->parent_iface);
 604
 605         device_lock();
 606
 607         if (iface->parent_ifname) {
 608                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 609                 iface->parent_iface.cb = interface_alias_cb;
 610                 interface_add_user(&iface->parent_iface, parent);
 611         } else if (iface->ifname &&
 612                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 613                 dev = device_get(iface->ifname, true);
 614                 interface_set_device_config(iface, dev);
 615         } else {
 616                 dev = iface->ext_dev.dev;
 617         }
 618
 619         if (dev)
 620                 interface_set_main_dev(iface, dev);
 621
 622         device_unlock();
 623
 624         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 625                 interface_set_available(iface, true);
 626 }
 627
 628 static void
 629 interface_cleanup_state(struct interface *iface)
 630 {
 631         interface_set_available(iface, false);
 632
 633         interface_flush_state(iface);
 634         interface_clear_errors(iface);
 635         interface_set_proto_state(iface, NULL);
 636
 637         interface_set_main_dev(iface, NULL);
 638         interface_set_l3_dev(iface, NULL);
 639 }
 640
 641 static void
 642 interface_cleanup(struct interface *iface)
 643 {
 644         struct interface_user *dep, *tmp;
 645
 646         uloop_timeout_cancel(&iface->remove_timer);
 647         device_remove_user(&iface->ext_dev);
 648
 649         if (iface->parent_iface.iface)
 650                 interface_remove_user(&iface->parent_iface);
 651
 652         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 653                 interface_remove_user(dep);
 654
 655         interface_clear_assignment_classes(iface);
 656         interface_ip_flush(&iface->config_ip);
 657         interface_cleanup_state(iface);
 658 }
 659
 660 static void
 661 interface_do_free(struct interface *iface)
 662 {
 663         interface_event(iface, IFEV_FREE);
 664         interface_cleanup(iface);
 665         free(iface->config);
 666         netifd_ubus_remove_interface(iface);
 667         avl_delete(&interfaces.avl, &iface->node.avl);
 668         free(iface);
 669 }
 670
 671 static void
 672 interface_do_reload(struct interface *iface)
 673 {
 674         interface_event(iface, IFEV_RELOAD);
 675         interface_cleanup_state(iface);
 676         proto_init_interface(iface, iface->config);
 677         interface_claim_device(iface);
 678 }
 679
 680 static void
 681 interface_handle_config_change(struct interface *iface)
 682 {
 683         enum interface_config_state state = iface->config_state;
 684
 685         iface->config_state = IFC_NORMAL;
 686         switch(state) {
 687         case IFC_NORMAL:
 688                 break;
 689         case IFC_RELOAD:
 690                 interface_do_reload(iface);
 691                 break;
 692         case IFC_REMOVE:
 693                 interface_do_free(iface);
 694                 return;
 695         }
 696         if (iface->autostart && iface->available)
 697                 interface_set_up(iface);
 698         else if (iface->dynamic)
 699                 set_config_state(iface, IFC_REMOVE);
 700 }
 701
 702 static void
 703 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 704 {
 705         struct interface *iface = state->iface;
 706
 707         switch (ev) {
 708         case IFPEV_UP:
 709                 if (iface->state != IFS_SETUP) {
 710                         if (iface->state == IFS_UP && iface->updated)
 711                                 interface_event(iface, IFEV_UPDATE);
 712                         return;
 713                 }
 714
 715                 if (!iface->l3_dev.dev)
 716                         interface_set_l3_dev(iface, iface->main_dev.dev);
 717
 718                 interface_ip_set_enabled(&iface->config_ip, true);
 719                 interface_ip_set_enabled(&iface->proto_ip, true);
 720                 system_flush_routes();
 721                 iface->state = IFS_UP;
 722                 iface->start_time = system_get_rtime();
 723                 interface_event(iface, IFEV_UP);
 724                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 725                 break;
 726         case IFPEV_DOWN:
 727                 if (iface->state == IFS_DOWN)
 728                         return;
 729
 730                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 731                 mark_interface_down(iface);
 732                 if (iface->main_dev.dev)
 733                         device_release(&iface->main_dev);
 734                 if (iface->l3_dev.dev)
 735                         device_remove_user(&iface->l3_dev);
 736                 interface_handle_config_change(iface);
 737                 break;
 738         case IFPEV_LINK_LOST:
 739                 if (iface->state != IFS_UP)
 740                         return;
 741
 742                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 743                 mark_interface_down(iface);
 744                 iface->state = IFS_SETUP;
 745                 break;
 746         default:
 747                 return;
 748         }
 749
 750         interface_write_resolv_conf();
 751 }
 752
 753 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 754 {
 755         if (iface->proto) {
 756                 iface->proto->free(iface->proto);
 757                 iface->proto = NULL;
 758         }
 759         iface->state = IFS_DOWN;
 760         iface->proto = state;
 761         if (!state)
 762                 return;
 763
 764         state->proto_event = interface_proto_event_cb;
 765         state->iface = iface;
 766 }
 767
 768 struct interface *
 769 interface_alloc(const char *name, struct blob_attr *config)
 770 {
 771         struct interface *iface;
 772         struct blob_attr *tb[IFACE_ATTR_MAX];
 773         struct blob_attr *cur;
 774         const char *proto_name = NULL;
 775         char *iface_name;
 776         bool force_link = false;
 777
 778         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 779         iface->name = strcpy(iface_name, name);
 780         INIT_LIST_HEAD(&iface->errors);
 781         INIT_LIST_HEAD(&iface->users);
 782         INIT_LIST_HEAD(&iface->hotplug_list);
 783         INIT_LIST_HEAD(&iface->assignment_classes);
 784         interface_ip_init(iface);
 785         avl_init(&iface->data, avl_strcmp, false, NULL);
 786         iface->config_ip.enabled = false;
 787
 788         iface->main_dev.cb = interface_main_dev_cb;
 789         iface->l3_dev.cb = interface_l3_dev_cb;
 790         iface->ext_dev.cb = interface_ext_dev_cb;
 791
 792         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 793                       blob_data(config), blob_len(config));
 794
 795         if ((cur = tb[IFACE_ATTR_PROTO]))
 796                 proto_name = blobmsg_data(cur);
 797
 798         proto_attach_interface(iface, proto_name);
 799         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 800                 force_link = true;
 801
 802         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 803         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 804         iface->proto_ip.no_defaultroute =
 805                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 806         iface->proto_ip.no_dns =
 807                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 808
 809         if ((cur = tb[IFACE_ATTR_DNS]))
 810                 interface_add_dns_server_list(&iface->config_ip, cur);
 811
 812         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 813                 interface_add_dns_search_list(&iface->config_ip, cur);
 814
 815         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 816                 iface->dns_metric = blobmsg_get_u32(cur);
 817
 818         if ((cur = tb[IFACE_ATTR_METRIC]))
 819                 iface->metric = blobmsg_get_u32(cur);
 820
 821         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 822                 iface->assignment_length = blobmsg_get_u32(cur);
 823
 824         /* defaults */
 825         iface->assignment_iface_id_selection = IFID_FIXED;
 826         iface->assignment_fixed_iface_id = in6addr_any;
 827         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 828
 829         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 830                 const char *ifaceid = blobmsg_data(cur);
 831                 if (!strcmp(ifaceid, "random")) {
 832                         iface->assignment_iface_id_selection = IFID_RANDOM;
 833                 }
 834                 else if (!strcmp(ifaceid, "eui64")) {
 835                         iface->assignment_iface_id_selection = IFID_EUI64;
 836                 }
 837                 else {
 838                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 839                            if we cannot parse -> revert to iface id 1 */
 840                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 841                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 842                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 843                                 iface->assignment_fixed_iface_id = in6addr_any;
 844                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 845                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 846                                                         falling back to iface id 1.\n", iface->name);
 847                         }
 848                 }
 849         }
 850
 851         iface->assignment_hint = -1;
 852         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 853                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 854                                 ~((1 << (64 - iface->assignment_length)) - 1);
 855
 856         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 857                 interface_add_assignment_classes(iface, cur);
 858
 859         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 860                 iface->assignment_weight = blobmsg_get_u32(cur);
 861
 862         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 863                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 864                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 865         }
 866
 867         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 868                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 869                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 870         }
 871
 872         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 873
 874         iface->config_autostart = iface->autostart;
 875         return iface;
 876 }
 877
 878 void interface_set_dynamic(struct interface *iface)
 879 {
 880         iface->dynamic = true;
 881         iface->autostart = true;
 882         iface->node.version = -1; // Don't delete on reload
 883 }
 884
 885 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 886 {
 887         struct blob_attr *tb[IFACE_ATTR_MAX];
 888         struct blob_attr *cur;
 889
 890         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 891                       blob_data(config), blob_len(config));
 892
 893         if (alias) {
 894                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 895                         iface->parent_ifname = blobmsg_data(cur);
 896
 897                 if (!iface->parent_ifname)
 898                         return false;
 899         } else {
 900                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 901                         iface->ifname = blobmsg_data(cur);
 902         }
 903
 904         iface->config = config;
 905         vlist_add(&interfaces, &iface->node, iface->name);
 906         return true;
 907 }
 908
 909 void
 910 interface_add(struct interface *iface, struct blob_attr *config)
 911 {
 912         __interface_add(iface, config, false);
 913 }
 914
 915 bool
 916 interface_add_alias(struct interface *iface, struct blob_attr *config)
 917 {
 918         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 919                 return false;
 920
 921         return __interface_add(iface, config, true);
 922 }
 923
 924 void
 925 interface_set_l3_dev(struct interface *iface, struct device *dev)
 926 {
 927         bool enabled = iface->config_ip.enabled;
 928         bool claimed = iface->l3_dev.claimed;
 929
 930         if (iface->l3_dev.dev == dev)
 931                 return;
 932
 933         interface_ip_set_enabled(&iface->config_ip, false);
 934         interface_ip_set_enabled(&iface->proto_ip, false);
 935         interface_ip_flush(&iface->proto_ip);
 936         device_add_user(&iface->l3_dev, dev);
 937
 938         if (dev) {
 939                 if (claimed) {
 940                         if (device_claim(&iface->l3_dev) < 0)
 941                                 return;
 942                 }
 943                 interface_ip_set_enabled(&iface->config_ip, enabled);
 944                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 945         }
 946 }
 947
 948 void
 949 interface_set_main_dev(struct interface *iface, struct device *dev)
 950 {
 951         bool claimed = iface->l3_dev.claimed;
 952
 953         if (iface->main_dev.dev == dev)
 954                 return;
 955
 956         interface_set_available(iface, false);
 957         device_add_user(&iface->main_dev, dev);
 958         if (!dev) {
 959                 interface_set_link_state(iface, false);
 960                 return;
 961         }
 962
 963         if (claimed) {
 964                 if (device_claim(&iface->l3_dev) < 0)
 965                         return;
 966         }
 967
 968         if (!iface->l3_dev.dev)
 969                 interface_set_l3_dev(iface, dev);
 970 }
 971
 972 int
 973 interface_remove_link(struct interface *iface, struct device *dev)
 974 {
 975         struct device *mdev = iface->main_dev.dev;
 976
 977         if (mdev && mdev->hotplug_ops)
 978                 return mdev->hotplug_ops->del(mdev, dev);
 979
 980         if (dev == iface->ext_dev.dev)
 981                 device_remove_user(&iface->ext_dev);
 982
 983         if (!iface->main_dev.hotplug)
 984                 return UBUS_STATUS_INVALID_ARGUMENT;
 985
 986         if (dev != iface->main_dev.dev)
 987                 return UBUS_STATUS_INVALID_ARGUMENT;
 988
 989         interface_set_main_dev(iface, NULL);
 990         return 0;
 991 }
 992
 993 static int
 994 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 995 {
 996         struct device *mdev = iface->main_dev.dev;
 997
 998         if (mdev == dev)
 999                 return 0;
1000
1001         if (iface->main_dev.hotplug)
1002                 device_remove_user(&iface->main_dev);
1003
1004         if (mdev) {
1005                 if (mdev->hotplug_ops)
1006                         return mdev->hotplug_ops->add(mdev, dev);
1007                 else
1008                         return UBUS_STATUS_NOT_SUPPORTED;
1009         }
1010
1011         if (link_ext)
1012                 device_add_user(&iface->ext_dev, dev);
1013
1014         interface_set_main_dev(iface, dev);
1015         iface->main_dev.hotplug = true;
1016         return 0;
1017 }
1018
1019 int
1020 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1021 {
1022         struct device *dev;
1023         int ret;
1024
1025         device_lock();
1026
1027         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1028         if (!dev) {
1029                 ret = UBUS_STATUS_NOT_FOUND;
1030                 goto out;
1031         }
1032
1033         if (add) {
1034                 interface_set_device_config(iface, dev);
1035                 device_set_present(dev, true);
1036
1037                 ret = interface_add_link(iface, dev, link_ext);
1038         } else {
1039                 ret = interface_remove_link(iface, dev);
1040         }
1041
1042 out:
1043         device_unlock();
1044
1045         return ret;
1046 }
1047
1048 int
1049 interface_set_up(struct interface *iface)
1050 {
1051         int ret;
1052
1053         iface->autostart = true;
1054
1055         if (iface->state != IFS_DOWN)
1056                 return 0;
1057
1058         interface_clear_errors(iface);
1059         if (!iface->available) {
1060                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1061                 return -1;
1062         }
1063
1064         if (iface->main_dev.dev) {
1065                 ret = device_claim(&iface->main_dev);
1066                 if (!ret)
1067                         interface_check_state(iface);
1068         }
1069         else
1070                 ret = __interface_set_up(iface);
1071
1072         return ret;
1073 }
1074
1075 int
1076 interface_set_down(struct interface *iface)
1077 {
1078         if (!iface) {
1079                 vlist_for_each_element(&interfaces, iface, node)
1080                         __interface_set_down(iface, false);
1081         } else {
1082                 iface->autostart = false;
1083                 __interface_set_down(iface, false);
1084         }
1085
1086         return 0;
1087 }
1088
1089 int
1090 interface_renew(struct interface *iface)
1091 {
1092         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1093                 return -1;
1094
1095         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1096 }
1097
1098 void
1099 interface_start_pending(void)
1100 {
1101         struct interface *iface;
1102
1103         vlist_for_each_element(&interfaces, iface, node) {
1104                 if (iface->available && iface->autostart)
1105                         interface_set_up(iface);
1106         }
1107 }
1108
1109 static void
1110 set_config_state(struct interface *iface, enum interface_config_state s)
1111 {
1112         iface->config_state = s;
1113         if (iface->state == IFS_DOWN)
1114                 interface_handle_config_change(iface);
1115         else
1116                 __interface_set_down(iface, false);
1117 }
1118
1119 void
1120 interface_update_start(struct interface *iface, const bool keep_old)
1121 {
1122         iface->updated = 0;
1123
1124         if (!keep_old)
1125                 interface_ip_update_start(&iface->proto_ip);
1126 }
1127
1128 void
1129 interface_update_complete(struct interface *iface)
1130 {
1131         interface_ip_update_complete(&iface->proto_ip);
1132 }
1133
1134 static void
1135 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1136 {
1137         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1138         vlist_simple_replace(&new->dns_search, &old->dns_search);
1139 }
1140
1141 static bool
1142 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1143 {
1144         struct blob_attr *ntb[__DEV_ATTR_MAX];
1145         struct blob_attr *otb[__DEV_ATTR_MAX];
1146         struct device *dev = if_old->main_dev.dev;
1147         unsigned long diff = 0;
1148
1149         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1150
1151         if (!dev)
1152                 return false;
1153
1154         if (if_old->device_config != if_new->device_config)
1155                 return true;
1156
1157         if (!if_new->device_config)
1158                 return false;
1159
1160         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1161                 blob_data(if_old->config), blob_len(if_old->config));
1162
1163         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1164                 blob_data(if_new->config), blob_len(if_new->config));
1165
1166         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1167         return diff;
1168 }
1169
1170 static void
1171 interface_change_config(struct interface *if_old, struct interface *if_new)
1172 {
1173         struct blob_attr *old_config = if_old->config;
1174         bool reload = false, reload_ip = false;
1175
1176 #define FIELD_CHANGED_STR(field)                                        \
1177                 ((!!if_old->field != !!if_new->field) ||                \
1178                  (if_old->field &&                                      \
1179                   strcmp(if_old->field, if_new->field) != 0))
1180
1181         if (FIELD_CHANGED_STR(parent_ifname)) {
1182                 if (if_old->parent_iface.iface)
1183                         interface_remove_user(&if_old->parent_iface);
1184                 reload = true;
1185         }
1186
1187         if (!reload && interface_device_config_changed(if_old, if_new))
1188                 reload = true;
1189
1190         if (FIELD_CHANGED_STR(ifname) ||
1191             if_old->proto_handler != if_new->proto_handler)
1192                 reload = true;
1193
1194         if (!if_old->proto_handler->config_params)
1195                 D(INTERFACE, "No config parameters for interface '%s'\n",
1196                   if_old->name);
1197         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1198                                        if_old->proto_handler->config_params))
1199                 reload = true;
1200
1201 #define UPDATE(field, __var) ({                                         \
1202                 bool __changed = (if_old->field != if_new->field);      \
1203                 if_old->field = if_new->field;                          \
1204                 __var |= __changed;                                     \
1205         })
1206
1207         if_old->config = if_new->config;
1208         if (if_old->config_autostart != if_new->config_autostart) {
1209                 if (if_old->config_autostart)
1210                         reload = true;
1211
1212                 if_old->autostart = if_new->config_autostart;
1213         }
1214
1215         if_old->device_config = if_new->device_config;
1216         if_old->config_autostart = if_new->config_autostart;
1217         if_old->ifname = if_new->ifname;
1218         if_old->parent_ifname = if_new->parent_ifname;
1219         if_old->proto_handler = if_new->proto_handler;
1220         if_old->force_link = if_new->force_link;
1221         if_old->dns_metric = if_new->dns_metric;
1222
1223         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1224         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1225
1226         UPDATE(metric, reload_ip);
1227         UPDATE(proto_ip.no_defaultroute, reload_ip);
1228         UPDATE(ip4table, reload_ip);
1229         UPDATE(ip6table, reload_ip);
1230         interface_merge_assignment_data(if_old, if_new);
1231
1232 #undef UPDATE
1233
1234         if (reload) {
1235                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1236                   if_old->name);
1237                 interface_clear_errors(if_old);
1238                 set_config_state(if_old, IFC_RELOAD);
1239                 goto out;
1240         }
1241
1242         if (reload_ip) {
1243                 bool config_ip_enabled = if_old->config_ip.enabled;
1244                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1245
1246                 interface_ip_set_enabled(&if_old->config_ip, false);
1247                 interface_ip_set_enabled(&if_old->proto_ip, false);
1248                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1249                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1250         }
1251
1252         interface_write_resolv_conf();
1253         if (if_old->main_dev.dev)
1254                 interface_check_state(if_old);
1255
1256 out:
1257         if_new->config = NULL;
1258         interface_cleanup(if_new);
1259         free(old_config);
1260         free(if_new);
1261 }
1262
1263 static void
1264 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1265                  struct vlist_node *node_old)
1266 {
1267         struct interface *if_old = container_of(node_old, struct interface, node);
1268         struct interface *if_new = container_of(node_new, struct interface, node);
1269
1270         if (node_old && node_new) {
1271                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1272                 interface_change_config(if_old, if_new);
1273         } else if (node_old) {
1274                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1275                 set_config_state(if_old, IFC_REMOVE);
1276         } else if (node_new) {
1277                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1278                 proto_init_interface(if_new, if_new->config);
1279                 interface_claim_device(if_new);
1280                 netifd_ubus_add_interface(if_new);
1281         }
1282 }
1283
1284
1285 static void __init
1286 interface_init_list(void)
1287 {
1288         vlist_init(&interfaces, avl_strcmp, interface_update);
1289         interfaces.keep_old = true;
1290         interfaces.no_delete = true;
1291 }