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