interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29
  30 enum {
  31         IFACE_ATTR_IFNAME,
  32         IFACE_ATTR_PROTO,
  33         IFACE_ATTR_AUTO,
  34         IFACE_ATTR_DEFAULTROUTE,
  35         IFACE_ATTR_PEERDNS,
  36         IFACE_ATTR_DNS,
  37         IFACE_ATTR_DNS_SEARCH,
  38         IFACE_ATTR_METRIC,
  39         IFACE_ATTR_INTERFACE,
  40         IFACE_ATTR_IP6ASSIGN,
  41         IFACE_ATTR_IP6HINT,
  42         IFACE_ATTR_IP4TABLE,
  43         IFACE_ATTR_IP6TABLE,
  44         IFACE_ATTR_IP6CLASS,
  45         IFACE_ATTR_DELEGATE,
  46         IFACE_ATTR_IP6IFACEID,
  47         IFACE_ATTR_FORCE_LINK,
  48         IFACE_ATTR_MAX
  49 };
  50
  51 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  52         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  54         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  57         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  58         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  60         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  61         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  62         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  66         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  67         [IFACE_ATTR_IP6IFACEID] = { .name = "ip6ifaceid", .type = BLOBMSG_TYPE_STRING },
  68         [IFACE_ATTR_FORCE_LINK] = { .name = "force_link", .type = BLOBMSG_TYPE_BOOL },
  69 };
  70
  71 const struct uci_blob_param_list interface_attr_list = {
  72         .n_params = IFACE_ATTR_MAX,
  73         .params = iface_attrs,
  74 };
  75
  76 static void
  77 set_config_state(struct interface *iface, enum interface_config_state s);
  78 static void
  79 interface_event(struct interface *iface, enum interface_event ev);
  80
  81 static void
  82 interface_error_flush(struct interface *iface)
  83 {
  84         struct interface_error *error, *tmp;
  85
  86         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  87                 list_del(&error->list);
  88                 free(error);
  89         }
  90 }
  91
  92 static void
  93 interface_clear_errors(struct interface *iface)
  94 {
  95         /* don't flush the errors in case the configured protocol handler matches the
  96            running protocol handler and is having the last error capability */
  97         if (!(iface->proto &&
  98               (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
  99               (iface->proto->handler->name == iface->proto_handler->name)))
 100                 interface_error_flush(iface);
 101 }
 102
 103 void interface_add_error(struct interface *iface, const char *subsystem,
 104                          const char *code, const char **data, int n_data)
 105 {
 106         struct interface_error *error;
 107         int i, len = 0;
 108         int *datalen = NULL;
 109         char *dest, *d_subsys, *d_code;
 110
 111         /* if the configured protocol handler has the last error support capability,
 112            errors should only be added if the running protocol handler matches the
 113            configured one */
 114         if (iface->proto &&
 115             (iface->proto->handler->flags & PROTO_FLAG_LASTERROR) &&
 116             (iface->proto->handler->name != iface->proto_handler->name))
 117                 return;
 118
 119         if (n_data) {
 120                 len = n_data * sizeof(char *);
 121                 datalen = alloca(len);
 122                 for (i = 0; i < n_data; i++) {
 123                         datalen[i] = strlen(data[i]) + 1;
 124                         len += datalen[i];
 125                 }
 126         }
 127
 128         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 129                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 130                 &d_code, code ? strlen(code) + 1 : 0);
 131         if (!error)
 132                 return;
 133
 134         /* Only keep the last flagged error, prevent this list grows unlimitted in case the
 135            protocol can't be established (e.g auth failure) */
 136         if (iface->proto_handler->flags & PROTO_FLAG_LASTERROR)
 137                 interface_error_flush(iface);
 138
 139         list_add_tail(&error->list, &iface->errors);
 140
 141         dest = (char *) &error->data[n_data + 1];
 142         for (i = 0; i < n_data; i++) {
 143                 error->data[i] = dest;
 144                 memcpy(dest, data[i], datalen[i]);
 145                 dest += datalen[i];
 146         }
 147         error->data[n_data] = NULL;
 148
 149         if (subsystem)
 150                 error->subsystem = strcpy(d_subsys, subsystem);
 151
 152         if (code)
 153                 error->code = strcpy(d_code, code);
 154 }
 155
 156 static void
 157 interface_data_del(struct interface *iface, struct interface_data *data)
 158 {
 159         avl_delete(&iface->data, &data->node);
 160         free(data);
 161 }
 162
 163 static void
 164 interface_data_flush(struct interface *iface)
 165 {
 166         struct interface_data *d, *tmp;
 167
 168         avl_for_each_element_safe(&iface->data, d, node, tmp)
 169                 interface_data_del(iface, d);
 170 }
 171
 172 int
 173 interface_add_data(struct interface *iface, const struct blob_attr *data)
 174 {
 175         struct interface_data *n, *o;
 176
 177         if (!blobmsg_check_attr(data, true))
 178                 return UBUS_STATUS_INVALID_ARGUMENT;
 179
 180         const char *name = blobmsg_name(data);
 181         unsigned len = blob_pad_len(data);
 182
 183         o = avl_find_element(&iface->data, name, o, node);
 184         if (o) {
 185                 if (blob_pad_len(o->data) == len && !memcmp(o->data, data, len))
 186                         return 0;
 187
 188                 interface_data_del(iface, o);
 189         }
 190
 191         n = calloc(1, sizeof(*n) + len);
 192         if (!n)
 193                 return UBUS_STATUS_UNKNOWN_ERROR;
 194
 195         memcpy(n->data, data, len);
 196         n->node.key = blobmsg_name(n->data);
 197         avl_insert(&iface->data, &n->node);
 198
 199         iface->updated |= IUF_DATA;
 200         return 0;
 201 }
 202
 203 int interface_parse_data(struct interface *iface, const struct blob_attr *attr)
 204 {
 205         struct blob_attr *cur;
 206         int rem, ret;
 207
 208         iface->updated = 0;
 209
 210         blob_for_each_attr(cur, attr, rem) {
 211                 ret = interface_add_data(iface, cur);
 212                 if (ret)
 213                         return ret;
 214         }
 215
 216         if (iface->updated && iface->state == IFS_UP)
 217                 interface_event(iface, IFEV_UPDATE);
 218
 219         return 0;
 220 }
 221
 222 static void
 223 interface_event(struct interface *iface, enum interface_event ev)
 224 {
 225         struct interface_user *dep, *tmp;
 226         struct device *adev = NULL;
 227
 228         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 229                 dep->cb(dep, iface, ev);
 230
 231         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 232                 dep->cb(dep, iface, ev);
 233
 234         switch (ev) {
 235         case IFEV_UP:
 236                 interface_error_flush(iface);
 237                 adev = iface->l3_dev.dev;
 238                 /* fall through */
 239         case IFEV_DOWN:
 240                 alias_notify_device(iface->name, adev);
 241                 break;
 242         default:
 243                 break;
 244         }
 245 }
 246
 247 static void
 248 interface_flush_state(struct interface *iface)
 249 {
 250         if (iface->l3_dev.dev)
 251                 device_release(&iface->l3_dev);
 252         interface_data_flush(iface);
 253 }
 254
 255 static void
 256 mark_interface_down(struct interface *iface)
 257 {
 258         enum interface_state state = iface->state;
 259
 260         if (state == IFS_DOWN)
 261                 return;
 262
 263         iface->state = IFS_DOWN;
 264         if (state == IFS_UP)
 265                 interface_event(iface, IFEV_DOWN);
 266         interface_ip_set_enabled(&iface->config_ip, false);
 267         interface_ip_set_enabled(&iface->proto_ip, false);
 268         interface_ip_flush(&iface->proto_ip);
 269         interface_flush_state(iface);
 270         system_flush_routes();
 271 }
 272
 273 void
 274 __interface_set_down(struct interface *iface, bool force)
 275 {
 276         enum interface_state state = iface->state;
 277         switch (state) {
 278         case IFS_UP:
 279         case IFS_SETUP:
 280                 iface->state = IFS_TEARDOWN;
 281                 if (state == IFS_UP)
 282                         interface_event(iface, IFEV_DOWN);
 283
 284                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 285                 if (force)
 286                         interface_flush_state(iface);
 287                 break;
 288
 289         case IFS_DOWN:
 290                 if (iface->main_dev.dev)
 291                         device_release(&iface->main_dev);
 292         case IFS_TEARDOWN:
 293         default:
 294                 break;
 295         }
 296 }
 297
 298 static int
 299 __interface_set_up(struct interface *iface)
 300 {
 301         int ret;
 302
 303         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 304
 305         iface->state = IFS_SETUP;
 306         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 307         if (ret)
 308                 mark_interface_down(iface);
 309
 310         return ret;
 311 }
 312
 313 static void
 314 interface_check_state(struct interface *iface)
 315 {
 316         bool link_state = iface->link_state || iface->force_link;
 317
 318         switch (iface->state) {
 319         case IFS_UP:
 320         case IFS_SETUP:
 321                 if (!iface->enabled || !link_state) {
 322                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 323                         mark_interface_down(iface);
 324                 }
 325                 break;
 326         case IFS_DOWN:
 327                 if (!iface->available)
 328                         return;
 329
 330                 if (iface->autostart && iface->enabled && link_state && !config_init)
 331                         __interface_set_up(iface);
 332                 break;
 333         default:
 334                 break;
 335         }
 336 }
 337
 338 static void
 339 interface_set_enabled(struct interface *iface, bool new_state)
 340 {
 341         if (iface->enabled == new_state)
 342                 return;
 343
 344         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 345         iface->enabled = new_state;
 346         interface_check_state(iface);
 347 }
 348
 349 static void
 350 interface_set_link_state(struct interface *iface, bool new_state)
 351 {
 352         if (iface->link_state == new_state)
 353                 return;
 354
 355         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 356         iface->link_state = new_state;
 357         interface_check_state(iface);
 358 }
 359
 360 static void
 361 interface_ext_dev_cb(struct device_user *dep, enum device_event ev)
 362 {
 363         if (ev == DEV_EVENT_REMOVE)
 364                 device_remove_user(dep);
 365 }
 366
 367 static void
 368 interface_main_dev_cb(struct device_user *dep, enum device_event ev)
 369 {
 370         struct interface *iface;
 371         bool new_state = false;
 372
 373         iface = container_of(dep, struct interface, main_dev);
 374         switch (ev) {
 375         case DEV_EVENT_ADD:
 376                 new_state = true;
 377         case DEV_EVENT_REMOVE:
 378                 interface_set_available(iface, new_state);
 379                 if (!new_state && dep->dev && dep->dev->external)
 380                         interface_set_main_dev(iface, NULL);
 381                 break;
 382         case DEV_EVENT_UP:
 383                 new_state = true;
 384         case DEV_EVENT_DOWN:
 385                 interface_set_enabled(iface, new_state);
 386                 break;
 387         case DEV_EVENT_LINK_UP:
 388                 new_state = true;
 389         case DEV_EVENT_LINK_DOWN:
 390                 interface_set_link_state(iface, new_state);
 391                 break;
 392         case DEV_EVENT_TOPO_CHANGE:
 393                 interface_proto_event(iface->proto, PROTO_CMD_RENEW, false);
 394                 return;
 395         default:
 396                 break;
 397         }
 398 }
 399
 400 static void
 401 interface_l3_dev_cb(struct device_user *dep, enum device_event ev)
 402 {
 403         struct interface *iface;
 404
 405         iface = container_of(dep, struct interface, l3_dev);
 406         if (iface->l3_dev.dev == iface->main_dev.dev)
 407                 return;
 408
 409         switch (ev) {
 410         case DEV_EVENT_LINK_DOWN:
 411                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 412                 break;
 413         default:
 414                 break;
 415         }
 416 }
 417
 418 void
 419 interface_set_available(struct interface *iface, bool new_state)
 420 {
 421         if (iface->available == new_state)
 422                 return;
 423
 424         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 425         iface->available = new_state;
 426
 427         if (new_state) {
 428                 if (iface->autostart && !config_init)
 429                         interface_set_up(iface);
 430         } else
 431                 __interface_set_down(iface, true);
 432 }
 433
 434 void
 435 interface_add_user(struct interface_user *dep, struct interface *iface)
 436 {
 437         if (!iface) {
 438                 list_add(&dep->list, &iface_all_users);
 439                 return;
 440         }
 441
 442         dep->iface = iface;
 443         list_add(&dep->list, &iface->users);
 444         if (iface->state == IFS_UP)
 445                 dep->cb(dep, iface, IFEV_UP);
 446 }
 447
 448 void
 449 interface_remove_user(struct interface_user *dep)
 450 {
 451         list_del_init(&dep->list);
 452         dep->iface = NULL;
 453 }
 454
 455 static void
 456 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 457 {
 458         struct blob_attr *cur;
 459         int rem;
 460
 461         blobmsg_for_each_attr(cur, list, rem) {
 462                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 463                         continue;
 464
 465                 if (!blobmsg_check_attr(cur, NULL))
 466                         continue;
 467
 468                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 469                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 470                 list_add(&c->head, &iface->assignment_classes);
 471         }
 472 }
 473
 474 static void
 475 interface_clear_assignment_classes(struct interface *iface)
 476 {
 477         while (!list_empty(&iface->assignment_classes)) {
 478                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 479                                 struct interface_assignment_class, head);
 480                 list_del(&c->head);
 481                 free(c);
 482         }
 483 }
 484
 485 static void
 486 interface_merge_assignment_data(struct interface *old, struct interface *new)
 487 {
 488         bool changed = (old->assignment_hint != new->assignment_hint ||
 489                         old->assignment_length != new->assignment_length ||
 490                         old->assignment_iface_id_selection != new->assignment_iface_id_selection ||
 491                         (old->assignment_iface_id_selection == IFID_FIXED &&
 492                          memcmp(&old->assignment_fixed_iface_id, &new->assignment_fixed_iface_id,
 493                                 sizeof(old->assignment_fixed_iface_id))) ||
 494                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 495
 496         struct interface_assignment_class *c;
 497         list_for_each_entry(c, &new->assignment_classes, head) {
 498                 // Compare list entries one-by-one to see if there was a change
 499                 if (list_empty(&old->assignment_classes)) // The new list is longer
 500                         changed = true;
 501
 502                 if (changed)
 503                         break;
 504
 505                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 506                                 struct interface_assignment_class, head);
 507
 508                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 509                         break;
 510
 511                 list_del(&c_old->head);
 512                 free(c_old);
 513         }
 514
 515         // The old list was longer than the new one or the last entry didn't match
 516         if (!list_empty(&old->assignment_classes)) {
 517                 interface_clear_assignment_classes(old);
 518                 changed = true;
 519         }
 520
 521         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 522
 523         if (changed) {
 524                 old->assignment_hint = new->assignment_hint;
 525                 old->assignment_length = new->assignment_length;
 526                 old->assignment_iface_id_selection = new->assignment_iface_id_selection;
 527                 old->assignment_fixed_iface_id = new->assignment_fixed_iface_id;
 528                 interface_refresh_assignments(true);
 529         }
 530 }
 531
 532 static void
 533 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 534 {
 535         struct interface *alias = container_of(dep, struct interface, parent_iface);
 536         struct device *dev = iface->l3_dev.dev;
 537
 538         switch (ev) {
 539         case IFEV_UP:
 540                 if (!dev)
 541                         return;
 542
 543                 interface_set_main_dev(alias, dev);
 544                 interface_set_available(alias, true);
 545                 break;
 546         case IFEV_DOWN:
 547                 interface_set_available(alias, false);
 548                 interface_set_main_dev(alias, NULL);
 549                 break;
 550         case IFEV_FREE:
 551                 interface_remove_user(dep);
 552                 break;
 553         case IFEV_RELOAD:
 554         case IFEV_UPDATE:
 555                 break;
 556         }
 557 }
 558
 559 static void
 560 interface_set_device_config(struct interface *iface, struct device *dev)
 561 {
 562         if (!dev || !dev->default_config)
 563                 return;
 564
 565         if (!iface->device_config &&
 566             (!dev->iface_config || dev->config_iface != iface))
 567                 return;
 568
 569         dev->config_iface = iface;
 570         dev->iface_config = iface->device_config;
 571         device_apply_config(dev, dev->type, iface->config);
 572 }
 573
 574 static void
 575 interface_claim_device(struct interface *iface)
 576 {
 577         struct interface *parent;
 578         struct device *dev = NULL;
 579
 580         if (iface->parent_iface.iface)
 581                 interface_remove_user(&iface->parent_iface);
 582
 583         if (iface->parent_ifname) {
 584                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 585                 iface->parent_iface.cb = interface_alias_cb;
 586                 interface_add_user(&iface->parent_iface, parent);
 587         } else if (iface->ifname &&
 588                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 589                 dev = device_get(iface->ifname, true);
 590                 interface_set_device_config(iface, dev);
 591         } else {
 592                 dev = iface->ext_dev.dev;
 593         }
 594
 595         if (dev)
 596                 interface_set_main_dev(iface, dev);
 597
 598         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 599                 interface_set_available(iface, true);
 600 }
 601
 602 static void
 603 interface_cleanup_state(struct interface *iface)
 604 {
 605         interface_set_available(iface, false);
 606
 607         interface_flush_state(iface);
 608         interface_clear_errors(iface);
 609         interface_set_proto_state(iface, NULL);
 610
 611         interface_set_main_dev(iface, NULL);
 612         interface_set_l3_dev(iface, NULL);
 613 }
 614
 615 static void
 616 interface_cleanup(struct interface *iface)
 617 {
 618         struct interface_user *dep, *tmp;
 619
 620         uloop_timeout_cancel(&iface->remove_timer);
 621         device_remove_user(&iface->ext_dev);
 622
 623         if (iface->parent_iface.iface)
 624                 interface_remove_user(&iface->parent_iface);
 625
 626         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 627                 interface_remove_user(dep);
 628
 629         interface_clear_assignment_classes(iface);
 630         interface_ip_flush(&iface->config_ip);
 631         interface_cleanup_state(iface);
 632 }
 633
 634 static void
 635 interface_do_free(struct interface *iface)
 636 {
 637         interface_event(iface, IFEV_FREE);
 638         interface_cleanup(iface);
 639         free(iface->config);
 640         netifd_ubus_remove_interface(iface);
 641         avl_delete(&interfaces.avl, &iface->node.avl);
 642         free(iface);
 643 }
 644
 645 static void
 646 interface_do_reload(struct interface *iface)
 647 {
 648         interface_event(iface, IFEV_RELOAD);
 649         interface_cleanup_state(iface);
 650         proto_init_interface(iface, iface->config);
 651         interface_claim_device(iface);
 652 }
 653
 654 static void
 655 interface_handle_config_change(struct interface *iface)
 656 {
 657         enum interface_config_state state = iface->config_state;
 658
 659         iface->config_state = IFC_NORMAL;
 660         switch(state) {
 661         case IFC_NORMAL:
 662                 break;
 663         case IFC_RELOAD:
 664                 interface_do_reload(iface);
 665                 break;
 666         case IFC_REMOVE:
 667                 interface_do_free(iface);
 668                 return;
 669         }
 670         if (iface->autostart && iface->available)
 671                 interface_set_up(iface);
 672         else if (iface->dynamic)
 673                 set_config_state(iface, IFC_REMOVE);
 674 }
 675
 676 static void
 677 interface_proto_event_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 678 {
 679         struct interface *iface = state->iface;
 680
 681         switch (ev) {
 682         case IFPEV_UP:
 683                 if (iface->state != IFS_SETUP) {
 684                         interface_event(iface, IFEV_UPDATE);
 685                         return;
 686                 }
 687
 688                 if (!iface->l3_dev.dev)
 689                         interface_set_l3_dev(iface, iface->main_dev.dev);
 690
 691                 interface_ip_set_enabled(&iface->config_ip, true);
 692                 interface_ip_set_enabled(&iface->proto_ip, true);
 693                 system_flush_routes();
 694                 iface->state = IFS_UP;
 695                 iface->start_time = system_get_rtime();
 696                 interface_event(iface, IFEV_UP);
 697                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 698                 break;
 699         case IFPEV_DOWN:
 700                 if (iface->state == IFS_DOWN)
 701                         return;
 702
 703                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 704                 mark_interface_down(iface);
 705                 if (iface->main_dev.dev)
 706                         device_release(&iface->main_dev);
 707                 if (iface->l3_dev.dev)
 708                         device_remove_user(&iface->l3_dev);
 709                 interface_handle_config_change(iface);
 710                 break;
 711         case IFPEV_LINK_LOST:
 712                 if (iface->state != IFS_UP)
 713                         return;
 714
 715                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 716                 mark_interface_down(iface);
 717                 iface->state = IFS_SETUP;
 718                 break;
 719         default:
 720                 return;
 721         }
 722
 723         interface_write_resolv_conf();
 724 }
 725
 726 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 727 {
 728         if (iface->proto) {
 729                 iface->proto->free(iface->proto);
 730                 iface->proto = NULL;
 731         }
 732         iface->state = IFS_DOWN;
 733         iface->proto = state;
 734         if (!state)
 735                 return;
 736
 737         state->proto_event = interface_proto_event_cb;
 738         state->iface = iface;
 739 }
 740
 741 struct interface *
 742 interface_alloc(const char *name, struct blob_attr *config)
 743 {
 744         struct interface *iface;
 745         struct blob_attr *tb[IFACE_ATTR_MAX];
 746         struct blob_attr *cur;
 747         const char *proto_name = NULL;
 748         char *iface_name;
 749         bool force_link = false;
 750
 751         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 752         iface->name = strcpy(iface_name, name);
 753         INIT_LIST_HEAD(&iface->errors);
 754         INIT_LIST_HEAD(&iface->users);
 755         INIT_LIST_HEAD(&iface->hotplug_list);
 756         INIT_LIST_HEAD(&iface->assignment_classes);
 757         interface_ip_init(iface);
 758         avl_init(&iface->data, avl_strcmp, false, NULL);
 759         iface->config_ip.enabled = false;
 760
 761         iface->main_dev.cb = interface_main_dev_cb;
 762         iface->l3_dev.cb = interface_l3_dev_cb;
 763         iface->ext_dev.cb = interface_ext_dev_cb;
 764
 765         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 766                       blob_data(config), blob_len(config));
 767
 768         if ((cur = tb[IFACE_ATTR_PROTO]))
 769                 proto_name = blobmsg_data(cur);
 770
 771         proto_attach_interface(iface, proto_name);
 772         if (iface->proto_handler->flags & PROTO_FLAG_FORCE_LINK_DEFAULT)
 773                 force_link = true;
 774
 775         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 776         iface->force_link = blobmsg_get_bool_default(tb[IFACE_ATTR_FORCE_LINK], force_link);
 777         iface->proto_ip.no_defaultroute =
 778                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 779         iface->proto_ip.no_dns =
 780                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 781
 782         if ((cur = tb[IFACE_ATTR_DNS]))
 783                 interface_add_dns_server_list(&iface->config_ip, cur);
 784
 785         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 786                 interface_add_dns_search_list(&iface->config_ip, cur);
 787
 788         if ((cur = tb[IFACE_ATTR_METRIC]))
 789                 iface->metric = blobmsg_get_u32(cur);
 790
 791         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 792                 iface->assignment_length = blobmsg_get_u32(cur);
 793
 794         /* defaults */
 795         iface->assignment_iface_id_selection = IFID_FIXED;
 796         iface->assignment_fixed_iface_id = in6addr_any;
 797         iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 798
 799         if ((cur = tb[IFACE_ATTR_IP6IFACEID])) {
 800                 const char *ifaceid = blobmsg_data(cur);
 801                 if (!strcmp(ifaceid, "random")) {
 802                         iface->assignment_iface_id_selection = IFID_RANDOM;
 803                 }
 804                 else if (!strcmp(ifaceid, "eui64")) {
 805                         iface->assignment_iface_id_selection = IFID_EUI64;
 806                 }
 807                 else {
 808                         /* we expect an IPv6 address with network id zero here -> fixed iface id
 809                            if we cannot parse -> revert to iface id 1 */
 810                         if (inet_pton(AF_INET6,ifaceid,&iface->assignment_fixed_iface_id) != 1 ||
 811                                         iface->assignment_fixed_iface_id.s6_addr32[0] != 0 ||
 812                                         iface->assignment_fixed_iface_id.s6_addr32[1] != 0) {
 813                                 iface->assignment_fixed_iface_id = in6addr_any;
 814                                 iface->assignment_fixed_iface_id.s6_addr[15] = 1;
 815                                 netifd_log_message(L_WARNING, "Failed to parse ip6ifaceid for interface '%s', \
 816                                                         falling back to iface id 1.\n", iface->name);
 817                         }
 818                 }
 819         }
 820
 821         iface->assignment_hint = -1;
 822         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 823                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 824                                 ~((1 << (64 - iface->assignment_length)) - 1);
 825
 826         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 827                 interface_add_assignment_classes(iface, cur);
 828
 829
 830         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 831                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 832                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 833         }
 834
 835         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 836                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 837                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 838         }
 839
 840         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 841
 842         iface->config_autostart = iface->autostart;
 843         return iface;
 844 }
 845
 846 void interface_set_dynamic(struct interface *iface)
 847 {
 848         iface->dynamic = true;
 849         iface->autostart = true;
 850         iface->node.version = -1; // Don't delete on reload
 851 }
 852
 853 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 854 {
 855         struct blob_attr *tb[IFACE_ATTR_MAX];
 856         struct blob_attr *cur;
 857
 858         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 859                       blob_data(config), blob_len(config));
 860
 861         if (alias) {
 862                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 863                         iface->parent_ifname = blobmsg_data(cur);
 864
 865                 if (!iface->parent_ifname)
 866                         return false;
 867         } else {
 868                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 869                         iface->ifname = blobmsg_data(cur);
 870         }
 871
 872         iface->config = config;
 873         vlist_add(&interfaces, &iface->node, iface->name);
 874         return true;
 875 }
 876
 877 void
 878 interface_add(struct interface *iface, struct blob_attr *config)
 879 {
 880         __interface_add(iface, config, false);
 881 }
 882
 883 bool
 884 interface_add_alias(struct interface *iface, struct blob_attr *config)
 885 {
 886         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 887                 return false;
 888
 889         return __interface_add(iface, config, true);
 890 }
 891
 892 void
 893 interface_set_l3_dev(struct interface *iface, struct device *dev)
 894 {
 895         bool enabled = iface->config_ip.enabled;
 896         bool claimed = iface->l3_dev.claimed;
 897
 898         if (iface->l3_dev.dev == dev)
 899                 return;
 900
 901         interface_ip_set_enabled(&iface->config_ip, false);
 902         interface_ip_set_enabled(&iface->proto_ip, false);
 903         interface_ip_flush(&iface->proto_ip);
 904         device_add_user(&iface->l3_dev, dev);
 905
 906         if (dev) {
 907                 if (claimed) {
 908                         if (device_claim(&iface->l3_dev) < 0)
 909                                 return;
 910                 }
 911                 interface_ip_set_enabled(&iface->config_ip, enabled);
 912                 interface_ip_set_enabled(&iface->proto_ip, enabled);
 913         }
 914 }
 915
 916 void
 917 interface_set_main_dev(struct interface *iface, struct device *dev)
 918 {
 919         bool claimed = iface->l3_dev.claimed;
 920
 921         if (iface->main_dev.dev == dev)
 922                 return;
 923
 924         interface_set_available(iface, false);
 925         device_add_user(&iface->main_dev, dev);
 926         if (!dev) {
 927                 interface_set_link_state(iface, false);
 928                 return;
 929         }
 930
 931         if (claimed) {
 932                 if (device_claim(&iface->l3_dev) < 0)
 933                         return;
 934         }
 935
 936         if (!iface->l3_dev.dev)
 937                 interface_set_l3_dev(iface, dev);
 938 }
 939
 940 int
 941 interface_remove_link(struct interface *iface, struct device *dev)
 942 {
 943         struct device *mdev = iface->main_dev.dev;
 944
 945         if (mdev && mdev->hotplug_ops)
 946                 return mdev->hotplug_ops->del(mdev, dev);
 947
 948         if (dev == iface->ext_dev.dev)
 949                 device_remove_user(&iface->ext_dev);
 950
 951         if (!iface->main_dev.hotplug)
 952                 return UBUS_STATUS_INVALID_ARGUMENT;
 953
 954         if (dev != iface->main_dev.dev)
 955                 return UBUS_STATUS_INVALID_ARGUMENT;
 956
 957         interface_set_main_dev(iface, NULL);
 958         return 0;
 959 }
 960
 961 static int
 962 interface_add_link(struct interface *iface, struct device *dev, bool link_ext)
 963 {
 964         struct device *mdev = iface->main_dev.dev;
 965
 966         if (mdev == dev)
 967                 return 0;
 968
 969         if (iface->main_dev.hotplug)
 970                 device_remove_user(&iface->main_dev);
 971
 972         if (mdev) {
 973                 if (mdev->hotplug_ops)
 974                         return mdev->hotplug_ops->add(mdev, dev);
 975                 else
 976                         return UBUS_STATUS_NOT_SUPPORTED;
 977         }
 978
 979         if (link_ext)
 980                 device_add_user(&iface->ext_dev, dev);
 981
 982         interface_set_main_dev(iface, dev);
 983         iface->main_dev.hotplug = true;
 984         return 0;
 985 }
 986
 987 int
 988 interface_handle_link(struct interface *iface, const char *name, bool add, bool link_ext)
 989 {
 990         struct device *dev;
 991         int ret;
 992
 993         device_lock();
 994
 995         dev = device_get(name, add ? (link_ext ? 2 : 1) : 0);
 996         if (!dev) {
 997                 ret = UBUS_STATUS_NOT_FOUND;
 998                 goto out;
 999         }
1000
1001         if (add) {
1002                 interface_set_device_config(iface, dev);
1003                 device_set_present(dev, true);
1004
1005                 ret = interface_add_link(iface, dev, link_ext);
1006         } else {
1007                 ret = interface_remove_link(iface, dev);
1008         }
1009
1010 out:
1011         device_unlock();
1012
1013         return ret;
1014 }
1015
1016 int
1017 interface_set_up(struct interface *iface)
1018 {
1019         int ret;
1020
1021         iface->autostart = true;
1022
1023         if (iface->state != IFS_DOWN)
1024                 return 0;
1025
1026         interface_clear_errors(iface);
1027         if (!iface->available) {
1028                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
1029                 return -1;
1030         }
1031
1032         if (iface->main_dev.dev) {
1033                 ret = device_claim(&iface->main_dev);
1034                 if (!ret)
1035                         interface_check_state(iface);
1036         }
1037         else
1038                 ret = __interface_set_up(iface);
1039
1040         return ret;
1041 }
1042
1043 int
1044 interface_set_down(struct interface *iface)
1045 {
1046         if (!iface) {
1047                 vlist_for_each_element(&interfaces, iface, node)
1048                         __interface_set_down(iface, false);
1049         } else {
1050                 iface->autostart = false;
1051                 __interface_set_down(iface, false);
1052         }
1053
1054         return 0;
1055 }
1056
1057 void
1058 interface_start_pending(void)
1059 {
1060         struct interface *iface;
1061
1062         vlist_for_each_element(&interfaces, iface, node) {
1063                 if (iface->available && iface->autostart)
1064                         interface_set_up(iface);
1065         }
1066 }
1067
1068 static void
1069 set_config_state(struct interface *iface, enum interface_config_state s)
1070 {
1071         iface->config_state = s;
1072         if (iface->state == IFS_DOWN)
1073                 interface_handle_config_change(iface);
1074         else
1075                 __interface_set_down(iface, false);
1076 }
1077
1078 void
1079 interface_update_start(struct interface *iface)
1080 {
1081         iface->updated = 0;
1082         interface_ip_update_start(&iface->proto_ip);
1083 }
1084
1085 void
1086 interface_update_complete(struct interface *iface)
1087 {
1088         interface_ip_update_complete(&iface->proto_ip);
1089 }
1090
1091 static void
1092 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
1093 {
1094         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
1095         vlist_simple_replace(&new->dns_search, &old->dns_search);
1096 }
1097
1098 static bool
1099 interface_device_config_changed(struct interface *if_old, struct interface *if_new)
1100 {
1101         struct blob_attr *ntb[__DEV_ATTR_MAX];
1102         struct blob_attr *otb[__DEV_ATTR_MAX];
1103         struct device *dev = if_old->main_dev.dev;
1104         unsigned long diff = 0;
1105
1106         BUILD_BUG_ON(sizeof(diff) < __DEV_ATTR_MAX / 8);
1107
1108         if (!dev)
1109                 return false;
1110
1111         if (if_old->device_config != if_new->device_config)
1112                 return true;
1113
1114         if (!if_new->device_config)
1115                 return false;
1116
1117         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb,
1118                 blob_data(if_old->config), blob_len(if_old->config));
1119
1120         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, ntb,
1121                 blob_data(if_new->config), blob_len(if_new->config));
1122
1123         uci_blob_diff(ntb, otb, &device_attr_list, &diff);
1124         return diff;
1125 }
1126
1127 static void
1128 interface_change_config(struct interface *if_old, struct interface *if_new)
1129 {
1130         struct blob_attr *old_config = if_old->config;
1131         bool reload = false, reload_ip = false;
1132
1133 #define FIELD_CHANGED_STR(field)                                        \
1134                 ((!!if_old->field != !!if_new->field) ||                \
1135                  (if_old->field &&                                      \
1136                   strcmp(if_old->field, if_new->field) != 0))
1137
1138         if (FIELD_CHANGED_STR(parent_ifname)) {
1139                 if (if_old->parent_iface.iface)
1140                         interface_remove_user(&if_old->parent_iface);
1141                 reload = true;
1142         }
1143
1144         if (!reload && interface_device_config_changed(if_old, if_new))
1145                 reload = true;
1146
1147         if (FIELD_CHANGED_STR(ifname) ||
1148             if_old->proto_handler != if_new->proto_handler)
1149                 reload = true;
1150
1151         if (!if_old->proto_handler->config_params)
1152                 D(INTERFACE, "No config parameters for interface '%s'\n",
1153                   if_old->name);
1154         else if (!uci_blob_check_equal(if_old->config, if_new->config,
1155                                        if_old->proto_handler->config_params))
1156                 reload = true;
1157
1158 #define UPDATE(field, __var) ({                                         \
1159                 bool __changed = (if_old->field != if_new->field);      \
1160                 if_old->field = if_new->field;                          \
1161                 __var |= __changed;                                     \
1162         })
1163
1164         if_old->config = if_new->config;
1165         if (if_old->config_autostart != if_new->config_autostart) {
1166                 if (if_old->config_autostart)
1167                         reload = true;
1168
1169                 if_old->autostart = if_new->config_autostart;
1170         }
1171
1172         if_old->device_config = if_new->device_config;
1173         if_old->config_autostart = if_new->config_autostart;
1174         if_old->ifname = if_new->ifname;
1175         if_old->parent_ifname = if_new->parent_ifname;
1176         if_old->proto_handler = if_new->proto_handler;
1177         if_old->force_link = if_new->force_link;
1178
1179         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
1180         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
1181
1182         UPDATE(metric, reload_ip);
1183         UPDATE(proto_ip.no_defaultroute, reload_ip);
1184         UPDATE(ip4table, reload_ip);
1185         UPDATE(ip6table, reload_ip);
1186         interface_merge_assignment_data(if_old, if_new);
1187
1188 #undef UPDATE
1189
1190         if (reload) {
1191                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
1192                   if_old->name);
1193                 interface_clear_errors(if_old);
1194                 set_config_state(if_old, IFC_RELOAD);
1195                 goto out;
1196         }
1197
1198         if (reload_ip) {
1199                 bool config_ip_enabled = if_old->config_ip.enabled;
1200                 bool proto_ip_enabled = if_old->proto_ip.enabled;
1201
1202                 interface_ip_set_enabled(&if_old->config_ip, false);
1203                 interface_ip_set_enabled(&if_old->proto_ip, false);
1204                 interface_ip_set_enabled(&if_old->proto_ip, proto_ip_enabled);
1205                 interface_ip_set_enabled(&if_old->config_ip, config_ip_enabled);
1206         }
1207
1208         interface_write_resolv_conf();
1209         if (if_old->main_dev.dev)
1210                 interface_check_state(if_old);
1211
1212 out:
1213         if_new->config = NULL;
1214         interface_cleanup(if_new);
1215         free(old_config);
1216         free(if_new);
1217 }
1218
1219 static void
1220 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1221                  struct vlist_node *node_old)
1222 {
1223         struct interface *if_old = container_of(node_old, struct interface, node);
1224         struct interface *if_new = container_of(node_new, struct interface, node);
1225
1226         if (node_old && node_new) {
1227                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1228                 interface_change_config(if_old, if_new);
1229         } else if (node_old) {
1230                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1231                 set_config_state(if_old, IFC_REMOVE);
1232         } else if (node_new) {
1233                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1234                 proto_init_interface(if_new, if_new->config);
1235                 interface_claim_device(if_new);
1236                 netifd_ubus_add_interface(if_new);
1237         }
1238 }
1239
1240
1241 static void __init
1242 interface_init_list(void)
1243 {
1244         vlist_init(&interfaces, avl_strcmp, interface_update);
1245         interfaces.keep_old = true;
1246         interfaces.no_delete = true;
1247 }