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 interface_set_main_dev(struct interface *iface, struct device *dev);
  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         case IFS_TEARDOWN:
 273                 interface_event(iface, IFEV_DOWN);
 274                 break;
 275         case IFS_SETUP:
 276                 interface_event(iface, IFEV_UP_FAILED);
 277                 break;
 278         default:
 279                 break;
 280         }
 281         interface_ip_set_enabled(&iface->config_ip, false);
 282         interface_ip_set_enabled(&iface->proto_ip, false);
 283         interface_ip_flush(&iface->proto_ip);
 284         interface_flush_state(iface);
 285         system_flush_routes();
 286 }
 287
 288 static inline void
 289 __set_config_state(struct interface *iface, enum interface_config_state s)
 290 {
 291         iface->config_state = s;
 292 }
 293
 294 static void
 295 __interface_set_down(struct interface *iface, bool force)
 296 {
 297         enum interface_state state = iface->state;
 298         switch (state) {
 299         case IFS_UP:
 300         case IFS_SETUP:
 301                 iface->state = IFS_TEARDOWN;
 302                 if (iface->dynamic)
 303                         __set_config_state(iface, IFC_REMOVE);
 304
 305                 if (state == IFS_UP)
 306                         interface_event(iface, IFEV_DOWN);
 307
 308                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 309                 if (force)
 310                         interface_flush_state(iface);
 311                 break;
 312
 313         case IFS_DOWN:
 314                 if (iface->main_dev.dev)
 315                         device_release(&iface->main_dev);
 316         case IFS_TEARDOWN:
 317         default:
 318                 break;
 319         }
 320 }
 321
 322 static int
 323 __interface_set_up(struct interface *iface)
 324 {
 325         int ret;
 326
 327         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 328
 329         iface->state = IFS_SETUP;
 330         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 331         if (ret)
 332                 mark_interface_down(iface);
 333
 334         return ret;
 335 }
 336
 337 static void
 338 interface_check_state(struct interface *iface)
 339 {
 340         bool link_state = iface->link_state || iface->force_link;
 341
 342         switch (iface->state) {
 343         case IFS_UP:
 344         case IFS_SETUP:
 345                 if (!iface->enabled || !link_state) {
 346                         iface->state = IFS_TEARDOWN;
 347                         if (iface->dynamic)
 348                                 __set_config_state(iface, IFC_REMOVE);
 349
 350                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 351                 }
 352                 break;
 353         case IFS_DOWN:
 354                 if (!iface->available)
 355                         return;
 356
 357                 if (iface->autostart && iface->enabled && link_state && !config_init)
 358                         __interface_set_up(iface);
 359                 break;
 360         default:
 361                 break;
 362         }
 363 }
 364
 365 static void
 366 interface_set_enabled(struct interface *iface, bool new_state)
 367 {
 368         if (iface->enabled == new_state)
 369                 return;
 370
 371         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 372         iface->enabled = new_state;
 373         interface_check_state(iface);
 374 }
 375
 376 static void
 377 interface_set_link_state(struct interface *iface, bool new_state)
 378 {
 379         if (iface->link_state == new_state)
 380                 return;
 381
 382         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 383         iface->link_state = new_state;
 384         interface_check_state(iface);
 385
 386         if (new_state && iface->force_link && iface->state == IFS_UP && !iface->link_up_event) {
 387                 interface_event(iface, IFEV_LINK_UP);
 388                 iface->link_up_event = true;
 389         }
 390 }
 391
 392 static void
 393 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 394 {
 395         if (ev == DEV_EVENT_REMOVE)
 396                 device_remove_user(dep);
 397 }
 398
 399 static void
 400 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 401 {
 402         struct interface *iface;
 403
 404         iface = container_of(dep, struct interface, main_dev);
 405         switch (ev) {
 406         case DEV_EVENT_ADD:
 407                 interface_set_available(iface, true);
 408                 break;
 409         case DEV_EVENT_REMOVE:
 410                 interface_set_available(iface, false);
 411                 if (dep->dev && dep->dev->external)
 412                         interface_set_main_dev(iface, NULL);
 413                 break;
 414         case DEV_EVENT_UP:
 415                 interface_set_enabled(iface, true);
 416                 break;
 417         case DEV_EVENT_DOWN:
 418                 interface_set_enabled(iface, false);
 419                 break;
 420         case DEV_EVENT_LINK_UP:
 421                 interface_set_link_state(iface, true);
 422                 break;
 423         case DEV_EVENT_LINK_DOWN:
 424                 interface_set_link_state(iface, false);
 425                 break;
 426         case DEV_EVENT_TOPO_CHANGE:
 427                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 428                 return;
 429         default:
 430                 break;
 431         }
 432 }
 433
 434 static void
 435 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 436 {
 437         struct interface *iface;
 438
 439         iface = container_of(dep, struct interface, l3_dev);
 440         if (iface->l3_dev.dev == iface->main_dev.dev)
 441                 return;
 442
 443         switch (ev) {
 444         case DEV_EVENT_LINK_DOWN:
 445                 if (iface->proto_handler->flags & PROTO_FLAG_TEARDOWN_ON_L3_LINK_DOWN)
 446                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 447                 break;
 448         default:
 449                 break;
 450         }
 451 }
 452
 453 void
 454 interface_set_available(struct interface *iface, bool new_state)
 455 {
 456         if (iface->available == new_state)
 457                 return;
 458
 459         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 460         iface->available = new_state;
 461
 462         if (new_state) {
 463                 if (iface->autostart && !config_init)
 464                         interface_set_up(iface);
 465         } else
 466                 __interface_set_down(iface, true);
 467 }
 468
 469 void
 470 interface_add_user(struct interface_user *dep, struct interface *iface)
 471 {
 472         if (!iface) {
 473                 list_add(&dep->list, &iface_all_users);
 474                 return;
 475         }
 476
 477         dep->iface = iface;
 478         list_add(&dep->list, &iface->users);
 479         if (iface->state == IFS_UP)
 480                 dep->cb(dep, iface, IFEV_UP);
 481 }
 482
 483 void
 484 interface_remove_user(struct interface_user *dep)
 485 {
 486         list_del_init(&dep->list);
 487         dep->iface = NULL;
 488 }
 489
 490 static void
 491 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 492 {
 493         struct blob_attr *cur;
 494         int rem;
 495
 496         blobmsg_for_each_attr(cur, list, rem) {
 497                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 498                         continue;
 499
 500                 if (!blobmsg_check_attr(cur, false))
 501                         continue;
 502
 503                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 504                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 505                 list_add(&c->head, &iface->assignment_classes);
 506         }
 507 }
 508
 509 static void
 510 interface_clear_assignment_classes(struct interface *iface)
 511 {
 512         while (!list_empty(&iface->assignment_classes)) {
 513                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 514                                 struct interface_assignment_class, head);
 515                 list_del(&c->head);
 516                 free(c);
 517         }
 518 }
 519
 520 static void
 521 interface_merge_assignment_data(struct interface *old, struct interface *new)
 522 {
 523         bool changed = (old->assignment_hint != new->assignment_hint ||
 524                         old->assignment_length != new->assignment_length ||
 525                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 526                         old->assignment_weight != new->assignment_weight ||
 527                         (old->assignment_iface_id_selection == IFID_FIXED &&
 528                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 529                                 sizeof(old->assignment_fixed_iface_id))) ||
 530                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 531
 532         struct interface_assignment_class *c;
 533         list_for_each_entry(c, &new->assignment_classes, head) {
 534                 /* Compare list entries one-by-one to see if there was a change */
 535                 if (list_empty(&old->assignment_classes)) /* The new list is longer */
 536                         changed = true;
 537
 538                 if (changed)
 539                         break;
 540
 541                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 542                                 struct interface_assignment_class, head);
 543
 544                 if (strcmp(c_old->name, c->name)) /* An entry didn't match */
 545                         break;
 546
 547                 list_del(&c_old->head);
 548                 free(c_old);
 549         }
 550
 551         /* The old list was longer than the new one or the last entry didn't match */
 552         if (!list_empty(&old->assignment_classes)) {
 553                 interface_clear_assignment_classes(old);
 554                 changed = true;
 555         }
 556
 557         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 558
 559         if (changed) {
 560                 old->assignment_hint = new->assignment_hint;
 561                 old->assignment_length = new->assignment_length;
 562                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 563                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 564                 old->assignment_weight = new->assignment_weight;
 565                 interface_refresh_assignments(true);
 566         }
 567 }
 568
 569 static void
 570 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 571 {
 572         struct interface *alias = container_of(dep, struct interface, parent_iface);
 573         struct device *dev = iface->l3_dev.dev;
 574
 575         switch (ev) {
 576         case IFEV_UP:
 577                 if (!dev)
 578                         return;
 579
 580                 interface_set_main_dev(alias, dev);
 581                 interface_set_available(alias, true);
 582                 break;
 583         case IFEV_DOWN:
 584         case IFEV_UP_FAILED:
 585                 interface_set_available(alias, false);
 586                 interface_set_main_dev(alias, NULL);
 587                 break;
 588         case IFEV_FREE:
 589                 interface_remove_user(dep);
 590                 break;
 591         default:
 592                 break;
 593         }
 594 }
 595
 596 static void
 597 interface_set_device_config(struct interface *iface, struct device *dev)
 598 {
 599         if (!dev || !dev->default_config)
 600                 return;
 601
 602         if (!iface->device_config &&
 603             (!dev->iface_config || dev->config_iface != iface))
 604                 return;
 605
 606         dev->config_iface = iface;
 607         dev->iface_config = iface->device_config;
 608         device_apply_config(dev, dev->type, iface->config);
 609 }
 610
 611 static void
 612 interface_claim_device(struct interface *iface)
 613 {
 614         struct interface *parent;
 615         struct device *dev = NULL;
 616
 617         if (iface->parent_iface.iface)
 618                 interface_remove_user(&iface->parent_iface);
 619
 620         device_lock();
 621
 622         if (iface->parent_ifname) {
 623                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 624                 iface->parent_iface.cb = interface_alias_cb;
 625                 interface_add_user(&iface->parent_iface, parent);
 626         } else if (iface->ifname &&
 627                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 628                 dev = device_get(iface->ifname, true);
 629                 interface_set_device_config(iface, dev);
 630         } else {
 631                 dev = iface->ext_dev.dev;
 632         }
 633
 634         if (dev)
 635                 interface_set_main_dev(iface, dev);
 636
 637         device_unlock();
 638
 639         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 640                 interface_set_available(iface, true);
 641 }
 642
 643 static void
 644 interface_cleanup_state(struct interface *iface)
 645 {
 646         interface_set_available(iface, false);
 647
 648         interface_flush_state(iface);
 649         interface_clear_errors(iface);
 650         interface_set_proto_state(iface, NULL);
 651
 652         interface_set_main_dev(iface, NULL);
 653         interface_set_l3_dev(iface, NULL);
 654 }
 655
 656 static void
 657 interface_cleanup(struct interface *iface)
 658 {
 659         struct interface_user *dep, *tmp;
 660
 661         uloop_timeout_cancel(&iface->remove_timer);
 662         device_remove_user(&iface->ext_dev);
 663
 664         if (iface->parent_iface.iface)
 665                 interface_remove_user(&iface->parent_iface);
 666
 667         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 668                 interface_remove_user(dep);
 669
 670         interface_clear_assignment_classes(iface);
 671         interface_ip_flush(&iface->config_ip);
 672         interface_cleanup_state(iface);
 673 }
 674
 675 static void
 676 interface_do_free(struct interface *iface)
 677 {
 678         interface_event(iface, IFEV_FREE);
 679         interface_cleanup(iface);
 680         free(iface->config);
 681         netifd_ubus_remove_interface(iface);
 682         avl_delete(&interfaces.avl, &iface->node.avl);
 683         free(iface);
 684 }
 685
 686 static void
 687 interface_do_reload(struct interface *iface)
 688 {
 689         interface_event(iface, IFEV_RELOAD);
 690         interface_cleanup_state(iface);
 691         proto_init_interface(iface, iface->config);
 692         interface_claim_device(iface);
 693 }
 694
 695 static void
 696 interface_handle_config_change(struct interface *iface)
 697 {
 698         enum interface_config_state state = iface->config_state;
 699
 700         iface->config_state = IFC_NORMAL;
 701         switch(state) {
 702         case IFC_NORMAL:
 703                 break;
 704         case IFC_RELOAD:
 705                 interface_do_reload(iface);
 706                 break;
 707         case IFC_REMOVE:
 708                 interface_do_free(iface);
 709                 return;
 710         }
 711         if (iface->autostart)
 712                 interface_set_up(iface);
 713 }
 714
 715 static void
 716 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 717 {
 718         struct interface *iface = state->iface;
 719
 720         switch (ev) {
 721         case IFPEV_UP:
 722                 if (iface->state != IFS_SETUP) {
 723                         if (iface->state == IFS_UP && iface->updated)
 724                                 interface_event(iface, IFEV_UPDATE);
 725                         return;
 726                 }
 727
 728                 if (!iface->l3_dev.dev)
 729                         interface_set_l3_dev(iface, iface->main_dev.dev);
 730
 731                 interface_ip_set_enabled(&iface->config_ip, true);
 732                 interface_ip_set_enabled(&iface->proto_ip, true);
 733                 system_flush_routes();
 734                 iface->state = IFS_UP;
 735                 iface->start_time = system_get_rtime();
 736                 interface_event(iface, IFEV_UP);
 737                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 738                 break;
 739         case IFPEV_DOWN:
 740                 if (iface->state == IFS_DOWN)
 741                         return;
 742
 743                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 744                 mark_interface_down(iface);
 745                 if (iface->main_dev.dev)
 746                         device_release(&iface->main_dev);
 747                 if (iface->l3_dev.dev)
 748                         device_remove_user(&iface->l3_dev);
 749                 interface_handle_config_change(iface);
 750                 break;
 751         case IFPEV_LINK_LOST:
 752                 if (iface->state != IFS_UP)
 753                         return;
 754
 755                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 756                 mark_interface_down(iface);
 757                 iface->state = IFS_SETUP;
 758                 break;
 759         default:
 760                 return;
 761         }
 762
 763         interface_write_resolv_conf();
 764 }
 765
 766 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 767 {
 768         if (iface->proto) {
 769                 iface->proto->free(iface->proto);
 770                 iface->proto = NULL;
 771         }
 772         iface->state = IFS_DOWN;
 773         iface->proto = state;
 774         if (!state)
 775                 return;
 776
 777         state->proto_event = interface_proto_event_cb;
 778         state->iface = iface;
 779 }
 780
 781 struct interface *
 782 interface_alloc(const char *name, struct blob_attr *config, bool dynamic)
 783 {
 784         struct interface *iface;
 785         struct blob_attr *tb[IFACE_ATTR_MAX];
 786         struct blob_attr *cur;
 787         const char *proto_name = NULL;
 788         char *iface_name;
 789         bool force_link = false;
 790
 791         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 792         iface->name = strcpy(iface_name, name);
 793         INIT_LIST_HEAD(&iface->errors);
 794         INIT_LIST_HEAD(&iface->users);
 795         INIT_LIST_HEAD(&iface->hotplug_list);
 796         INIT_LIST_HEAD(&iface->assignment_classes);
 797         interface_ip_init(iface);
 798         avl_init(&iface->data, avl_strcmp, false, NULL);
 799         iface->config_ip.enabled = false;
 800
 801         iface->main_dev.cb = interface_main_dev_cb;
 802         iface->l3_dev.cb = interface_l3_dev_cb;
 803         iface->ext_dev.cb = interface_ext_dev_cb;
 804
 805         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 806                       blob_data(config), blob_len(config));
 807
 808         if ((cur = tb[IFACE_ATTR_PROTO]))
 809                 proto_name = blobmsg_data(cur);
 810
 811         proto_attach_interface(iface, proto_name);
 812         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 813                 force_link = true;
 814
 815         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 816         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 817         iface->dynamic = dynamic;
 818         iface->proto_ip.no_defaultroute =
 819                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 820         iface->proto_ip.no_dns =
 821                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 822
 823         if ((cur = tb[IFACE_ATTR_DNS]))
 824                 interface_add_dns_server_list(&iface->config_ip, cur);
 825
 826         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 827                 interface_add_dns_search_list(&iface->config_ip, cur);
 828
 829         if ((cur = tb[IFACE_ATTR_DNS_METRIC]))
 830                 iface->dns_metric = blobmsg_get_u32(cur);
 831
 832         if ((cur = tb[IFACE_ATTR_METRIC]))
 833                 iface->metric = blobmsg_get_u32(cur);
 834
 835         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 836                 iface->assignment_length = blobmsg_get_u32(cur);
 837
 838         /* defaults */
 839         iface->assignment_iface_id_selection = IFID_FIXED;
 840         iface->assignment_fixed_iface_id = in6addr_any;
 841         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 842
 843         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 844                 const char *ifaceid = blobmsg_data(cur);
 845                 if (!strcmp(ifaceid, "random")) {
 846                         iface->assignment_iface_id_selection = IFID_RANDOM;
 847                 }
 848                 else if (!strcmp(ifaceid, "eui64")) {
 849                         iface->assignment_iface_id_selection = IFID_EUI64;
 850                 }
 851                 else {
 852                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 853                            if we cannot parse -> revert to iface id 1 */
 854                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 855                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 856                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 857                                 iface->assignment_fixed_iface_id = in6addr_any;
 858                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 859                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 860                                                         falling back to iface id 1.\n", iface->name);
 861                         }
 862                 }
 863         }
 864
 865         iface->assignment_hint = -1;
 866         if ((cur = tb[IFACE_ATTR_IP6HINT])) {
 867                 int32_t assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16);
 868
 869                 iface->assignment_hint = assignment_hint & ~((1 << (64 - iface->assignment_length)) - 1);
 870
 871                 if (iface->assignment_hint != assignment_hint)
 872                         netifd_log_message(L_WARNING, "Using truncated assignment hint %d (0x%x) for interface '%s'\n",
 873                                            iface->assignment_hint, iface->assignment_hint, iface->name);
 874         }
 875
 876         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 877                 interface_add_assignment_classes(iface, cur);
 878
 879         if ((cur = tb[IFACE_ATTR_IP6WEIGHT]))
 880                 iface->assignment_weight = blobmsg_get_u32(cur);
 881
 882         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 883                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 884                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 885         }
 886
 887         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 888                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 889                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 890         }
 891
 892         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 893
 894         iface->config_autostart = iface->autostart;
 895         return iface;
 896 }
 897
 898 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 899 {
 900         struct blob_attr *tb[IFACE_ATTR_MAX];
 901         struct blob_attr *cur;
 902         char *name = NULL;
 903
 904         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 905                       blob_data(config), blob_len(config));
 906
 907         if (alias) {
 908                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 909                         iface->parent_ifname = blobmsg_data(cur);
 910
 911                 if (!iface->parent_ifname)
 912                         return false;
 913         } else {
 914                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 915                         iface->ifname = blobmsg_data(cur);
 916         }
 917
 918         if (iface->dynamic) {
 919                 name = strdup(iface->name);
 920
 921                 if (!name)
 922                         return false;
 923         }
 924
 925         iface->config = config;
 926         vlist_add(&interfaces, &iface->node, iface->name);
 927
 928         if (name) {
 929                 iface = vlist_find(&interfaces, name, iface, node);
 930                 free(name);
 931
 932                 /* Don't delete dynamic interface on reload */
 933                 if (iface)
 934                         iface->node.version = -1;
 935         }
 936
 937         return true;
 938 }
 939
 940 bool
 941 interface_add(struct interface *iface, struct blob_attr *config)
 942 {
 943         return __interface_add(iface, config, false);
 944 }
 945
 946 bool
 947 interface_add_alias(struct interface *iface, struct blob_attr *config)
 948 {
 949         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 950                 return false;
 951
 952         return __interface_add(iface, config, true);
 953 }
 954
 955 void
 956 interface_set_l3_dev(struct interface *iface, struct device *dev)
 957 {
 958         bool enabled = iface->config_ip.enabled;
 959         bool claimed = iface->l3_dev.claimed;
 960
 961         if (iface->l3_dev.dev == dev)
 962                 return;
 963
 964         interface_ip_set_enabled(&iface->config_ip, false);
 965         interface_ip_set_enabled(&iface->proto_ip, false);
 966         interface_ip_flush(&iface->proto_ip);
 967         device_add_user(&iface->l3_dev, dev);
 968
 969         if (dev) {
 970                 if (claimed) {
 971                         if (device_claim(&iface->l3_dev) < 0)
 972                                 return;
 973                 }
 974                 interface_ip_set_enabled(&iface->config_ip, enabled);
 975                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 976         }
 977 }
 978
 979 static void
 980 interface_set_main_dev(struct interface *iface, struct device *dev)
 981 {
 982         bool claimed = iface->l3_dev.claimed;
 983
 984         if (iface->main_dev.dev == dev)
 985                 return;
 986
 987         interface_set_available(iface, false);
 988         device_add_user(&iface->main_dev, dev);
 989         if (!dev) {
 990                 interface_set_link_state(iface, false);
 991                 return;
 992         }
 993
 994         if (claimed) {
 995                 if (device_claim(&iface->l3_dev) < 0)
 996                         return;
 997         }
 998
 999         if (!iface->l3_dev.dev)
1000                 interface_set_l3_dev(iface, dev);
1001 }
1002
1003 static int
1004 interface_remove_link(struct interface *iface, struct device *dev)
1005 {
1006         struct device *mdev = iface->main_dev.dev;
1007
1008         if (mdev && mdev->hotplug_ops)
1009                 return mdev->hotplug_ops->del(mdev, dev);
1010
1011         if (dev == iface->ext_dev.dev)
1012                 device_remove_user(&iface->ext_dev);
1013
1014         if (!iface->main_dev.hotplug)
1015                 return UBUS_STATUS_INVALID_ARGUMENT;
1016
1017         if (dev != iface->main_dev.dev)
1018                 return UBUS_STATUS_INVALID_ARGUMENT;
1019
1020         interface_set_main_dev(iface, NULL);
1021         return 0;
1022 }
1023
1024 static int
1025 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
1026 {
1027         struct device *mdev = iface->main_dev.dev;
1028
1029         if (mdev == dev)
1030                 return 0;
1031
1032         if (iface->main_dev.hotplug)
1033                 device_remove_user(&iface->main_dev);
1034
1035         if (mdev) {
1036                 if (mdev->hotplug_ops)
1037                         return mdev->hotplug_ops->add(mdev, dev);
1038                 else
1039                         return UBUS_STATUS_NOT_SUPPORTED;
1040         }
1041
1042         if (link_ext)
1043                 device_add_user(&iface->ext_dev, dev);
1044
1045         interface_set_main_dev(iface, dev);
1046         iface->main_dev.hotplug = true;
1047         return 0;
1048 }
1049
1050 int
1051 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
1052 {
1053         struct device *dev;
1054         int ret;
1055
1056         device_lock();
1057
1058         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
1059         if (!dev) {
1060                 ret = UBUS_STATUS_NOT_FOUND;
1061                 goto out;
1062         }
1063
1064         if (add) {
1065                 interface_set_device_config(iface, dev);
1066                 device_set_present(dev, true);
1067
1068                 ret = interface_add_link(iface, dev, link_ext);
1069         } else {
1070                 ret = interface_remove_link(iface, dev);
1071         }
1072
1073 out:
1074         device_unlock();
1075
1076         return ret;
1077 }
1078
1079 void
1080 interface_set_up(struct interface *iface)
1081 {
1082         int ret;
1083         const char *error = NULL;
1084
1085         iface->autostart = true;
1086
1087         if (iface->state != IFS_DOWN)
1088                 return;
1089
1090         interface_clear_errors(iface);
1091         if (iface->available) {
1092                 if (iface->main_dev.dev) {
1093                         ret = device_claim(&iface->main_dev);
1094                         if (!ret)
1095                                 interface_check_state(iface);
1096                         else
1097                                 error = "DEVICE_CLAIM_FAILED";
1098                 } else {
1099                         ret = __interface_set_up(iface);
1100                         if (ret)
1101                                 error = "SETUP_FAILED";
1102                 }
1103         } else
1104                 error = "NO_DEVICE";
1105
1106         if (error)
1107                 interface_add_error(iface, "interface", error, NULL, 0);
1108 }
1109
1110 void
1111 interface_set_down(struct interface *iface)
1112 {
1113         if (!iface) {
1114                 vlist_for_each_element(&interfaces, iface, node)
1115                         __interface_set_down(iface, false);
1116         } else {
1117                 iface->autostart = false;
1118                 __interface_set_down(iface, false);
1119         }
1120 }
1121
1122 int
1123 interface_renew(struct interface *iface)
1124 {
1125         if (iface->state == IFS_TEARDOWN || iface->state == IFS_DOWN)
1126                 return -1;
1127
1128         return interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
1129 }
1130
1131 void
1132 interface_start_pending(void)
1133 {
1134         struct interface *iface;
1135
1136         vlist_for_each_element(&interfaces, iface, node) {
1137                 if (iface->autostart)
1138                         interface_set_up(iface);
1139         }
1140 }
1141
1142 static void
1143 set_config_state(struct interface *iface, enum interface_config_state s)
1144 {
1145         __set_config_state(iface, s);
1146         if (iface->state == IFS_DOWN)
1147                 interface_handle_config_change(iface);
1148         else
1149                 __interface_set_down(iface, false);
1150 }
1151
1152 void
1153 interface_update_start(struct interface *iface, const bool keep_old)
1154 {
1155         iface->updated = 0;
1156
1157         if (!keep_old)
1158                 interface_ip_update_start(&iface->proto_ip);
1159 }
1160
1161 void
1162 interface_update_complete(struct interface *iface)
1163 {
1164         interface_ip_update_complete(&iface->proto_ip);
1165 }
1166
1167 static void
1168 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1169 {
1170         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1171         vlist_simple_replace(&new->dns_search, &old->dns_search);
1172 }
1173
1174 static bool
1175 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1176 {
1177         struct blob_attr *ntb[__DEV_ATTR_MAX];
1178         struct blob_attr *otb[__DEV_ATTR_MAX];
1179         struct device *dev = if_old->main_dev.dev;
1180         unsigned long diff = 0;
1181
1182         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1183
1184         if (!dev)
1185                 return false;
1186
1187         if (if_old->device_config != if_new->device_config)
1188                 return true;
1189
1190         if (!if_new->device_config)
1191                 return false;
1192
1193         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1194                 blob_data(if_old->config), blob_len(if_old->config));
1195
1196         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1197                 blob_data(if_new->config), blob_len(if_new->config));
1198
1199         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1200         return diff;
1201 }
1202
1203 static void
1204 interface_change_config(struct interface *if_old, struct interface *if_new)
1205 {
1206         struct blob_attr *old_config = if_old->config;
1207         bool reload = false, reload_ip = false, update_prefix_delegation = false;
1208
1209 #define FIELD_CHANGED_STR(field)                                        \
1210                 ((!!if_old->field != !!if_new->field) ||                \
1211                  (if_old->field &&                                      \
1212                   strcmp(if_old->field, if_new->field) != 0))
1213
1214         if (FIELD_CHANGED_STR(parent_ifname)) {
1215                 if (if_old->parent_iface.iface)
1216                         interface_remove_user(&if_old->parent_iface);
1217                 reload = true;
1218         }
1219
1220         if (!reload && interface_device_config_changed(if_old, if_new))
1221                 reload = true;
1222
1223         if (FIELD_CHANGED_STR(ifname) ||
1224             if_old->proto_handler != if_new->proto_handler)
1225                 reload = true;
1226
1227         if (!if_old->proto_handler->config_params)
1228                 D(INTERFACE, "No config parameters for interface '%s'\n",
1229                   if_old->name);
1230         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1231                                        if_old->proto_handler->config_params))
1232                 reload = true;
1233
1234 #define UPDATE(field, __var) ({                                         \
1235                 bool __changed = (if_old->field != if_new->field);      \
1236                 if_old->field = if_new->field;                          \
1237                 __var |= __changed;                                     \
1238         })
1239
1240         if_old->config = if_new->config;
1241         if (if_old->config_autostart != if_new->config_autostart) {
1242                 if (if_old->config_autostart)
1243                         reload = true;
1244
1245                 if_old->autostart = if_new->config_autostart;
1246         }
1247
1248         if_old->device_config = if_new->device_config;
1249         if_old->config_autostart = if_new->config_autostart;
1250         if_old->ifname = if_new->ifname;
1251         if_old->parent_ifname = if_new->parent_ifname;
1252         if_old->dynamic = if_new->dynamic;
1253         if_old->proto_handler = if_new->proto_handler;
1254         if_old->force_link = if_new->force_link;
1255         if_old->dns_metric = if_new->dns_metric;
1256
1257         if (if_old->proto_ip.no_delegation != if_new->proto_ip.no_delegation) {
1258                 if_old->proto_ip.no_delegation = if_new->proto_ip.no_delegation;
1259                 update_prefix_delegation = true;
1260         }
1261
1262         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1263         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1264
1265         UPDATE(metric, reload_ip);
1266         UPDATE(proto_ip.no_defaultroute, reload_ip);
1267         UPDATE(ip4table, reload_ip);
1268         UPDATE(ip6table, reload_ip);
1269         interface_merge_assignment_data(if_old, if_new);
1270
1271 #undef UPDATE
1272
1273         if (reload) {
1274                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1275                   if_old->name);
1276                 interface_clear_errors(if_old);
1277                 set_config_state(if_old, IFC_RELOAD);
1278                 goto out;
1279         }
1280
1281         if (reload_ip) {
1282                 bool config_ip_enabled = if_old->config_ip.enabled;
1283                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1284
1285                 interface_ip_set_enabled(&if_old->config_ip, false);
1286                 interface_ip_set_enabled(&if_old->proto_ip, false);
1287                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1288                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1289         }
1290
1291         if (update_prefix_delegation)
1292                 interface_update_prefix_delegation(&if_old->proto_ip);
1293
1294         interface_write_resolv_conf();
1295         if (if_old->main_dev.dev)
1296                 interface_check_state(if_old);
1297
1298 out:
1299         if_new->config = NULL;
1300         interface_cleanup(if_new);
1301         free(old_config);
1302         free(if_new);
1303 }
1304
1305 static void
1306 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1307                  struct vlist_node *node_old)
1308 {
1309         struct interface *if_old = container_of(node_old, struct interface, node);
1310         struct interface *if_new = container_of(node_new, struct interface, node);
1311
1312         if (node_old && node_new) {
1313                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1314                 interface_change_config(if_old, if_new);
1315         } else if (node_old) {
1316                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1317                 set_config_state(if_old, IFC_REMOVE);
1318         } else if (node_new) {
1319                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1320                 interface_event(if_new, IFEV_CREATE);
1321                 proto_init_interface(if_new, if_new->config);
1322                 interface_claim_device(if_new);
1323                 netifd_ubus_add_interface(if_new);
1324         }
1325 }
1326
1327
1328 static void __init
1329 interface_init_list(void)
1330 {
1331         vlist_init(&interfaces, avl_strcmp, interface_update);
1332         interfaces.keep_old = true;
1333         interfaces.no_delete = true;
1334 }