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 static unsigned int interface_serial = 0;
  30
  31 enum {
  32         IFACE_ATTR_IFNAME,
  33         IFACE_ATTR_PROTO,
  34         IFACE_ATTR_AUTO,
  35         IFACE_ATTR_DEFAULTROUTE,
  36         IFACE_ATTR_PEERDNS,
  37         IFACE_ATTR_DNS,
  38         IFACE_ATTR_DNS_SEARCH,
  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_MAX
  48 };
  49
  50 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  51         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  52         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  53         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  54         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  55         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  56         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  57         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  58         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  59         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  60         [IFACE_ATTR_IP6ASSIGN] = { .name = "ip6assign", .type = BLOBMSG_TYPE_INT32 },
  61         [IFACE_ATTR_IP6HINT] = { .name = "ip6hint", .type = BLOBMSG_TYPE_STRING },
  62         [IFACE_ATTR_IP4TABLE] = { .name = "ip4table", .type = BLOBMSG_TYPE_STRING },
  63         [IFACE_ATTR_IP6TABLE] = { .name = "ip6table", .type = BLOBMSG_TYPE_STRING },
  64         [IFACE_ATTR_IP6CLASS] = { .name = "ip6class", .type = BLOBMSG_TYPE_ARRAY },
  65         [IFACE_ATTR_DELEGATE] = { .name = "delegate", .type = BLOBMSG_TYPE_BOOL },
  66 };
  67
  68 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  69         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_IP6CLASS] = { .type = BLOBMSG_TYPE_STRING },
  71 };
  72
  73 const struct uci_blob_param_list interface_attr_list = {
  74         .n_params = IFACE_ATTR_MAX,
  75         .params = iface_attrs,
  76         .info = iface_attr_info,
  77 };
  78
  79 static void
  80 interface_clear_errors(struct interface *iface)
  81 {
  82         struct interface_error *error, *tmp;
  83
  84         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  85                 list_del(&error->list);
  86                 free(error);
  87         }
  88 }
  89
  90 void interface_add_error(struct interface *iface, const char *subsystem,
  91                          const char *code, const char **data, int n_data)
  92 {
  93         struct interface_error *error;
  94         int i, len = 0;
  95         int *datalen = NULL;
  96         char *dest, *d_subsys, *d_code;
  97
  98         if (n_data) {
  99                 len = n_data * sizeof(char *);
 100                 datalen = alloca(len);
 101                 for (i = 0; i < n_data; i++) {
 102                         datalen[i] = strlen(data[i]) + 1;
 103                         len += datalen[i];
 104                 }
 105         }
 106
 107         error = calloc_a(sizeof(*error) + sizeof(char *) + len,
 108                 &d_subsys, subsystem ? strlen(subsystem) + 1 : 0,
 109                 &d_code, code ? strlen(code) + 1 : 0);
 110         if (!error)
 111                 return;
 112
 113         list_add_tail(&error->list, &iface->errors);
 114
 115         dest = (char *) &error->data[n_data + 1];
 116         for (i = 0; i < n_data; i++) {
 117                 error->data[i] = dest;
 118                 memcpy(dest, data[i], datalen[i]);
 119                 dest += datalen[i];
 120         }
 121         error->data[n_data++] = NULL;
 122
 123         if (subsystem)
 124                 error->subsystem = strcpy(d_subsys, subsystem);
 125
 126         if (code)
 127                 error->code = strcpy(d_code, code);
 128 }
 129
 130 static void
 131 interface_data_del(struct interface *iface, struct interface_data *data)
 132 {
 133         avl_delete(&iface->data, &data->node);
 134         free(data);
 135 }
 136
 137 static void
 138 interface_data_flush(struct interface *iface)
 139 {
 140         struct interface_data *d, *tmp;
 141
 142         avl_for_each_element_safe(&iface->data, d, node, tmp)
 143                 interface_data_del(iface, d);
 144 }
 145
 146 int
 147 interface_add_data(struct interface *iface, const struct blob_attr *data)
 148 {
 149         struct interface_data *n, *o;
 150
 151         if (!blobmsg_check_attr(data, true))
 152                 return UBUS_STATUS_INVALID_ARGUMENT;
 153
 154         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 155         memcpy(n->data, data, blob_pad_len(data));
 156         n->node.key = blobmsg_name(n->data);
 157
 158         o = avl_find_element(&iface->data, n->node.key, o, node);
 159         if (o)
 160                 interface_data_del(iface, o);
 161
 162         avl_insert(&iface->data, &n->node);
 163         return 0;
 164 }
 165
 166 static void
 167 interface_event(struct interface *iface, enum interface_event ev)
 168 {
 169         struct interface_user *dep, *tmp;
 170         struct device *adev = NULL;
 171
 172         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 173                 dep->cb(dep, iface, ev);
 174
 175         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 176                 dep->cb(dep, iface, ev);
 177
 178         switch (ev) {
 179         case IFEV_UP:
 180                 adev = iface->l3_dev.dev;
 181                 /* fall through */
 182         case IFEV_DOWN:
 183                 alias_notify_device(iface->name, adev);
 184                 break;
 185         default:
 186                 break;
 187         }
 188 }
 189
 190 static void
 191 interface_flush_state(struct interface *iface)
 192 {
 193         if (iface->l3_dev.dev)
 194                 device_release(&iface->l3_dev);
 195         interface_data_flush(iface);
 196 }
 197
 198 static void
 199 mark_interface_down(struct interface *iface)
 200 {
 201         enum interface_state state = iface->state;
 202
 203         if (state == IFS_DOWN)
 204                 return;
 205
 206         iface->state = IFS_DOWN;
 207         if (state == IFS_UP)
 208                 interface_event(iface, IFEV_DOWN);
 209         interface_ip_set_enabled(&iface->config_ip, false);
 210         interface_ip_flush(&iface->proto_ip);
 211         interface_flush_state(iface);
 212         system_flush_routes();
 213 }
 214
 215 void
 216 __interface_set_down(struct interface *iface, bool force)
 217 {
 218         switch (iface->state) {
 219         case IFS_UP:
 220                 interface_event(iface, IFEV_DOWN);
 221         case IFS_SETUP:
 222                 iface->state = IFS_TEARDOWN;
 223                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 224                 if (force)
 225                         interface_flush_state(iface);
 226
 227                 if (iface->dynamic)
 228                         vlist_delete(&interfaces, &iface->node);
 229                 break;
 230
 231         case IFS_DOWN:
 232                 if (iface->main_dev.dev)
 233                         device_release(&iface->main_dev);
 234         case IFS_TEARDOWN:
 235         default:
 236                 break;
 237         }
 238 }
 239
 240 static int
 241 __interface_set_up(struct interface *iface)
 242 {
 243         int ret;
 244
 245         netifd_log_message(L_NOTICE, "Interface '%s' is setting up now\n", iface->name);
 246
 247         iface->state = IFS_SETUP;
 248         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 249         if (ret)
 250                 mark_interface_down(iface);
 251
 252         return ret;
 253 }
 254
 255 static void
 256 interface_check_state(struct interface *iface)
 257 {
 258         switch (iface->state) {
 259         case IFS_UP:
 260                 if (!iface->enabled || !iface->link_state) {
 261                         mark_interface_down(iface);
 262                         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, false);
 263                 }
 264                 break;
 265         case IFS_DOWN:
 266                 if (iface->enabled && iface->link_state && !config_init)
 267                         __interface_set_up(iface);
 268                 break;
 269         default:
 270                 break;
 271         }
 272 }
 273
 274 static void
 275 interface_set_enabled(struct interface *iface, bool new_state)
 276 {
 277         if (iface->enabled == new_state)
 278                 return;
 279
 280         netifd_log_message(L_NOTICE, "Interface '%s' is %s\n", iface->name, new_state ? "enabled" : "disabled");
 281         iface->enabled = new_state;
 282         interface_check_state(iface);
 283 }
 284
 285 static void
 286 interface_set_link_state(struct interface *iface, bool new_state)
 287 {
 288         if (iface->link_state == new_state)
 289                 return;
 290
 291         netifd_log_message(L_NOTICE, "Interface '%s' has link connectivity %s\n", iface->name, new_state ? "" : "loss");
 292         iface->link_state = new_state;
 293         interface_check_state(iface);
 294 }
 295
 296 static void
 297 interface_cb(struct device_user *dep, enum device_event ev)
 298 {
 299         struct interface *iface;
 300         bool new_state = false;
 301
 302         iface = container_of(dep, struct interface, main_dev);
 303         switch (ev) {
 304         case DEV_EVENT_ADD:
 305                 new_state = true;
 306         case DEV_EVENT_REMOVE:
 307                 interface_set_available(iface, new_state);
 308                 if (!new_state && dep->dev->external)
 309                         interface_set_main_dev(iface, NULL);
 310                 break;
 311         case DEV_EVENT_UP:
 312                 new_state = true;
 313         case DEV_EVENT_DOWN:
 314                 interface_set_enabled(iface, new_state);
 315                 break;
 316         case DEV_EVENT_LINK_UP:
 317                 new_state = true;
 318         case DEV_EVENT_LINK_DOWN:
 319                 interface_set_link_state(iface, new_state);
 320                 break;
 321         default:
 322                 break;
 323         }
 324 }
 325
 326 void
 327 interface_set_available(struct interface *iface, bool new_state)
 328 {
 329         if (iface->available == new_state)
 330                 return;
 331
 332         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 333         iface->available = new_state;
 334
 335         if (new_state) {
 336                 if (iface->autostart && !config_init)
 337                         interface_set_up(iface);
 338         } else
 339                 __interface_set_down(iface, true);
 340 }
 341
 342 void
 343 interface_add_user(struct interface_user *dep, struct interface *iface)
 344 {
 345         if (!iface) {
 346                 list_add(&dep->list, &iface_all_users);
 347                 return;
 348         }
 349
 350         dep->iface = iface;
 351         list_add(&dep->list, &iface->users);
 352         if (iface->state == IFS_UP)
 353                 dep->cb(dep, iface, IFEV_UP);
 354 }
 355
 356 void
 357 interface_remove_user(struct interface_user *dep)
 358 {
 359         list_del_init(&dep->list);
 360         dep->iface = NULL;
 361 }
 362
 363 static void
 364 interface_add_assignment_classes(struct interface *iface, struct blob_attr *list)
 365 {
 366         struct blob_attr *cur;
 367         int rem;
 368
 369         blobmsg_for_each_attr(cur, list, rem) {
 370                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 371                         continue;
 372
 373                 if (!blobmsg_check_attr(cur, NULL))
 374                         continue;
 375
 376                 struct interface_assignment_class *c = malloc(sizeof(*c) + blobmsg_data_len(cur));
 377                 memcpy(c->name, blobmsg_data(cur), blobmsg_data_len(cur));
 378                 list_add(&c->head, &iface->assignment_classes);
 379         }
 380 }
 381
 382 static void
 383 interface_clear_assignment_classes(struct interface *iface)
 384 {
 385         while (!list_empty(&iface->assignment_classes)) {
 386                 struct interface_assignment_class *c = list_first_entry(&iface->assignment_classes,
 387                                 struct interface_assignment_class, head);
 388                 list_del(&c->head);
 389                 free(c);
 390         }
 391 }
 392
 393 static void
 394 interface_merge_assignment_data(struct interface *old, struct interface *new)
 395 {
 396         bool changed = (old->assignment_hint != new->assignment_hint ||
 397                         old->assignment_length != new->assignment_length ||
 398                         list_empty(&old->assignment_classes) != list_empty(&new->assignment_classes));
 399
 400         struct interface_assignment_class *c;
 401         list_for_each_entry(c, &new->assignment_classes, head) {
 402                 // Compare list entries one-by-one to see if there was a change
 403                 if (list_empty(&old->assignment_classes)) // The new list is longer
 404                         changed = true;
 405
 406                 if (changed)
 407                         break;
 408
 409                 struct interface_assignment_class *c_old = list_first_entry(&old->assignment_classes,
 410                                 struct interface_assignment_class, head);
 411
 412                 if (strcmp(c_old->name, c->name)) // An entry didn't match
 413                         break;
 414
 415                 list_del(&c_old->head);
 416                 free(c_old);
 417         }
 418
 419         // The old list was longer than the new one or the last entry didn't match
 420         if (!list_empty(&old->assignment_classes)) {
 421                 interface_clear_assignment_classes(old);
 422                 changed = true;
 423         }
 424
 425         list_splice_init(&new->assignment_classes, &old->assignment_classes);
 426
 427         if (changed) {
 428                 old->assignment_hint = new->assignment_hint;
 429                 old->assignment_length = new->assignment_length;
 430                 interface_refresh_assignments(true);
 431         }
 432 }
 433
 434 static void
 435 interface_alias_cb(struct interface_user *dep, struct interface *iface, enum interface_event ev)
 436 {
 437         struct interface *alias = container_of(dep, struct interface, parent_iface);
 438         struct device *dev = iface->l3_dev.dev;
 439
 440         switch (ev) {
 441         case IFEV_UP:
 442                 if (!dev)
 443                         return;
 444
 445                 interface_set_main_dev(alias, dev);
 446                 interface_set_available(alias, true);
 447                 break;
 448         case IFEV_DOWN:
 449                 interface_set_available(alias, false);
 450                 interface_set_main_dev(alias, NULL);
 451                 break;
 452         case IFEV_FREE:
 453                 interface_remove_user(dep);
 454                 break;
 455         case IFEV_RELOAD:
 456         case IFEV_UPDATE:
 457                 break;
 458         }
 459 }
 460
 461 static void
 462 interface_claim_device(struct interface *iface)
 463 {
 464         struct interface *parent;
 465         struct device *dev = NULL;
 466
 467         if (iface->parent_iface.iface)
 468                 interface_remove_user(&iface->parent_iface);
 469
 470         if (iface->parent_ifname) {
 471                 parent = vlist_find(&interfaces, iface->parent_ifname, parent, node);
 472                 iface->parent_iface.cb = interface_alias_cb;
 473                 interface_add_user(&iface->parent_iface, parent);
 474         } else if (iface->ifname &&
 475                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 476                 dev = device_get(iface->ifname, true);
 477         }
 478
 479         if (dev)
 480                 interface_set_main_dev(iface, dev);
 481
 482         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 483                 interface_set_available(iface, true);
 484 }
 485
 486 static void
 487 interface_cleanup_state(struct interface *iface)
 488 {
 489         interface_set_available(iface, false);
 490
 491         interface_flush_state(iface);
 492         interface_clear_errors(iface);
 493         interface_set_proto_state(iface, NULL);
 494
 495         if (iface->main_dev.dev)
 496                 interface_set_main_dev(iface, NULL);
 497 }
 498
 499 static void
 500 interface_cleanup(struct interface *iface)
 501 {
 502         struct interface_user *dep, *tmp;
 503
 504         if (iface->parent_iface.iface)
 505                 interface_remove_user(&iface->parent_iface);
 506
 507         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 508                 interface_remove_user(dep);
 509
 510         interface_clear_assignment_classes(iface);
 511         interface_ip_flush(&iface->config_ip);
 512         interface_cleanup_state(iface);
 513 }
 514
 515 static void
 516 interface_do_free(struct interface *iface)
 517 {
 518         interface_event(iface, IFEV_FREE);
 519         interface_cleanup(iface);
 520         free(iface->config);
 521         netifd_ubus_remove_interface(iface);
 522         avl_delete(&interfaces.avl, &iface->node.avl);
 523         free(iface);
 524 }
 525
 526 static void
 527 interface_do_reload(struct interface *iface)
 528 {
 529         interface_event(iface, IFEV_RELOAD);
 530         interface_cleanup_state(iface);
 531         proto_init_interface(iface, iface->config);
 532         interface_claim_device(iface);
 533 }
 534
 535 static void
 536 interface_handle_config_change(struct interface *iface)
 537 {
 538         enum interface_config_state state = iface->config_state;
 539
 540         iface->config_state = IFC_NORMAL;
 541         switch(state) {
 542         case IFC_NORMAL:
 543                 break;
 544         case IFC_RELOAD:
 545                 interface_do_reload(iface);
 546                 break;
 547         case IFC_REMOVE:
 548                 interface_do_free(iface);
 549                 return;
 550         }
 551         if (iface->autostart && iface->available)
 552                 interface_set_up(iface);
 553 }
 554
 555 static void
 556 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 557 {
 558         struct interface *iface = state->iface;
 559
 560         switch (ev) {
 561         case IFPEV_UP:
 562                 if (iface->state != IFS_SETUP) {
 563                         interface_event(iface, IFEV_UPDATE);
 564                         return;
 565                 }
 566
 567                 interface_ip_set_enabled(&iface->config_ip, true);
 568                 system_flush_routes();
 569                 iface->state = IFS_UP;
 570                 iface->start_time = system_get_rtime();
 571                 interface_event(iface, IFEV_UP);
 572                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 573                 break;
 574         case IFPEV_DOWN:
 575                 if (iface->state == IFS_DOWN)
 576                         return;
 577
 578                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 579                 mark_interface_down(iface);
 580                 if (iface->main_dev.dev)
 581                         device_release(&iface->main_dev);
 582                 interface_handle_config_change(iface);
 583                 break;
 584         case IFPEV_LINK_LOST:
 585                 if (iface->state != IFS_UP)
 586                         return;
 587
 588                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 589                 mark_interface_down(iface);
 590                 iface->state = IFS_SETUP;
 591                 break;
 592         }
 593
 594         interface_write_resolv_conf();
 595 }
 596
 597 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 598 {
 599         if (iface->proto) {
 600                 iface->proto->free(iface->proto);
 601                 iface->proto = NULL;
 602         }
 603         iface->state = IFS_DOWN;
 604         iface->proto = state;
 605         if (!state)
 606                 return;
 607
 608         state->proto_event = interface_proto_cb;
 609         state->iface = iface;
 610 }
 611
 612 struct interface *
 613 interface_alloc(const char *name, struct blob_attr *config)
 614 {
 615         struct interface *iface;
 616         struct blob_attr *tb[IFACE_ATTR_MAX];
 617         struct blob_attr *cur;
 618         const char *proto_name = NULL;
 619         char *iface_name;
 620
 621         iface = calloc_a(sizeof(*iface), &iface_name, strlen(name) + 1);
 622         iface->name = strcpy(iface_name, name);
 623         INIT_LIST_HEAD(&iface->errors);
 624         INIT_LIST_HEAD(&iface->users);
 625         INIT_LIST_HEAD(&iface->hotplug_list);
 626         INIT_LIST_HEAD(&iface->assignment_classes);
 627         interface_ip_init(iface);
 628         avl_init(&iface->data, avl_strcmp, false, NULL);
 629         iface->config_ip.enabled = false;
 630
 631         iface->main_dev.cb = interface_cb;
 632
 633         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 634                       blob_data(config), blob_len(config));
 635
 636         if ((cur = tb[IFACE_ATTR_PROTO]))
 637                 proto_name = blobmsg_data(cur);
 638
 639         proto_attach_interface(iface, proto_name);
 640
 641         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 642         iface->proto_ip.no_defaultroute =
 643                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 644         iface->proto_ip.no_dns =
 645                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 646
 647         if ((cur = tb[IFACE_ATTR_DNS]))
 648                 interface_add_dns_server_list(&iface->config_ip, cur);
 649
 650         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 651                 interface_add_dns_search_list(&iface->config_ip, cur);
 652
 653         if ((cur = tb[IFACE_ATTR_METRIC]))
 654                 iface->metric = blobmsg_get_u32(cur);
 655
 656         if ((cur = tb[IFACE_ATTR_IP6ASSIGN]))
 657                 iface->assignment_length = blobmsg_get_u32(cur);
 658
 659         iface->assignment_hint = -1;
 660         if ((cur = tb[IFACE_ATTR_IP6HINT]))
 661                 iface->assignment_hint = strtol(blobmsg_get_string(cur), NULL, 16) &
 662                                 ~((1 << (64 - iface->assignment_length)) - 1);
 663
 664         if ((cur = tb[IFACE_ATTR_IP6CLASS]))
 665                 interface_add_assignment_classes(iface, cur);
 666
 667
 668         if ((cur = tb[IFACE_ATTR_IP4TABLE])) {
 669                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip4table))
 670                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 671         }
 672
 673         // Set a default exteranl routing table for IPv6 to do source-based-filtering
 674         struct interface *iface_old = vlist_find(&interfaces, name, iface_old, node);
 675         if (iface_old && iface_old->ip6table > 1000 && iface_old->ip6table < 2000)
 676                 iface->ip6table = iface_old->ip6table;
 677         else
 678                 iface->ip6table = 1000 + ++interface_serial;
 679
 680         if ((cur = tb[IFACE_ATTR_IP6TABLE])) {
 681                 if (!system_resolve_rt_table(blobmsg_data(cur), &iface->ip6table))
 682                         DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
 683         }
 684
 685         iface->proto_ip.no_delegation = !blobmsg_get_bool_default(tb[IFACE_ATTR_DELEGATE], true);
 686
 687         iface->config_autostart = iface->autostart;
 688         return iface;
 689 }
 690
 691 void interface_set_dynamic(struct interface *iface)
 692 {
 693         iface->dynamic = true;
 694         iface->node.version = -1; // Don't delete on reload
 695 }
 696
 697 static bool __interface_add(struct interface *iface, struct blob_attr *config, bool alias)
 698 {
 699         struct blob_attr *tb[IFACE_ATTR_MAX];
 700         struct blob_attr *cur;
 701
 702         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 703                       blob_data(config), blob_len(config));
 704
 705         if (alias) {
 706                 if ((cur = tb[IFACE_ATTR_INTERFACE]))
 707                         iface->parent_ifname = blobmsg_data(cur);
 708
 709                 if (!iface->parent_ifname)
 710                         return false;
 711         } else {
 712                 if ((cur = tb[IFACE_ATTR_IFNAME]))
 713                         iface->ifname = blobmsg_data(cur);
 714         }
 715
 716
 717         iface->config = config;
 718         vlist_add(&interfaces, &iface->node, iface->name);
 719         return true;
 720 }
 721
 722 void
 723 interface_add(struct interface *iface, struct blob_attr *config)
 724 {
 725         __interface_add(iface, config, false);
 726 }
 727
 728 bool
 729 interface_add_alias(struct interface *iface, struct blob_attr *config)
 730 {
 731         if (iface->proto_handler->flags & PROTO_FLAG_NODEV)
 732                 return false;
 733
 734         return __interface_add(iface, config, true);
 735 }
 736
 737 void
 738 interface_set_l3_dev(struct interface *iface, struct device *dev)
 739 {
 740         bool enabled = iface->config_ip.enabled;
 741         bool claimed = iface->l3_dev.claimed;
 742
 743         if (iface->l3_dev.dev == dev)
 744                 return;
 745
 746         interface_ip_set_enabled(&iface->config_ip, false);
 747         interface_ip_flush(&iface->proto_ip);
 748         device_add_user(&iface->l3_dev, dev);
 749
 750         if (dev) {
 751                 if (claimed)
 752                         device_claim(&iface->l3_dev);
 753                 interface_ip_set_enabled(&iface->config_ip, enabled);
 754         }
 755 }
 756
 757 void
 758 interface_set_main_dev(struct interface *iface, struct device *dev)
 759 {
 760         bool set_l3 = (!dev || iface->main_dev.dev == iface->l3_dev.dev);
 761         bool claimed = iface->l3_dev.claimed;
 762
 763         if (iface->main_dev.dev == dev)
 764                 return;
 765
 766         if (set_l3)
 767                 interface_set_l3_dev(iface, dev);
 768
 769         device_add_user(&iface->main_dev, dev);
 770         if (!dev) {
 771                 interface_set_link_state(iface, false);
 772                 return;
 773         }
 774
 775         if (claimed)
 776                 device_claim(&iface->l3_dev);
 777
 778         if (!iface->l3_dev.dev)
 779                 interface_set_l3_dev(iface, dev);
 780 }
 781
 782 int
 783 interface_remove_link(struct interface *iface, struct device *dev)
 784 {
 785         struct device *mdev = iface->main_dev.dev;
 786
 787         if (mdev && mdev->hotplug_ops)
 788                 return mdev->hotplug_ops->del(mdev, dev);
 789
 790         if (!iface->main_dev.hotplug)
 791                 return UBUS_STATUS_INVALID_ARGUMENT;
 792
 793         if (dev != iface->main_dev.dev)
 794                 return UBUS_STATUS_INVALID_ARGUMENT;
 795
 796         device_remove_user(&iface->main_dev);
 797         return 0;
 798 }
 799
 800 int
 801 interface_add_link(struct interface *iface, struct device *dev)
 802 {
 803         struct device *mdev = iface->main_dev.dev;
 804
 805         if (mdev == dev)
 806                 return 0;
 807
 808         if (iface->main_dev.hotplug)
 809                 device_remove_user(&iface->main_dev);
 810
 811         if (mdev) {
 812                 if (mdev->hotplug_ops)
 813                         return mdev->hotplug_ops->add(mdev, dev);
 814                 else
 815                         return UBUS_STATUS_NOT_SUPPORTED;
 816         }
 817
 818         interface_set_main_dev(iface, dev);
 819         iface->main_dev.hotplug = true;
 820         return 0;
 821 }
 822
 823 int
 824 interface_handle_link(struct interface *iface, const char *name, bool add)
 825 {
 826         struct device *dev;
 827         int ret;
 828
 829         device_lock();
 830
 831         dev = device_get(name, add ? 2 : 0);
 832         if (!dev) {
 833                 ret = UBUS_STATUS_NOT_FOUND;
 834                 goto out;
 835         }
 836
 837         if (add) {
 838                 device_set_present(dev, true);
 839                 if (iface->device_config)
 840                         device_set_config(dev, &simple_device_type, iface->config);
 841
 842                 system_if_apply_settings(dev, &dev->settings);
 843                 ret = interface_add_link(iface, dev);
 844         } else {
 845                 ret = interface_remove_link(iface, dev);
 846         }
 847
 848 out:
 849         device_unlock();
 850
 851         return ret;
 852 }
 853
 854 int
 855 interface_set_up(struct interface *iface)
 856 {
 857         int ret;
 858
 859         iface->autostart = true;
 860
 861         if (iface->state != IFS_DOWN)
 862                 return 0;
 863
 864         interface_clear_errors(iface);
 865         if (!iface->available) {
 866                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 867                 return -1;
 868         }
 869
 870         if (iface->main_dev.dev) {
 871                 ret = device_claim(&iface->main_dev);
 872                 if (!ret)
 873                         interface_check_state(iface);
 874         }
 875         else
 876                 ret = __interface_set_up(iface);
 877
 878         return ret;
 879 }
 880
 881 int
 882 interface_set_down(struct interface *iface)
 883 {
 884         if (!iface) {
 885                 vlist_for_each_element(&interfaces, iface, node)
 886                         __interface_set_down(iface, false);
 887         } else {
 888                 iface->autostart = false;
 889                 __interface_set_down(iface, false);
 890         }
 891
 892         return 0;
 893 }
 894
 895 void
 896 interface_start_pending(void)
 897 {
 898         struct interface *iface;
 899
 900         vlist_for_each_element(&interfaces, iface, node) {
 901                 if (iface->available && iface->autostart)
 902                         interface_set_up(iface);
 903         }
 904 }
 905
 906 static void
 907 set_config_state(struct interface *iface, enum interface_config_state s)
 908 {
 909         iface->config_state = s;
 910         if (iface->state == IFS_DOWN)
 911                 interface_handle_config_change(iface);
 912         else
 913                 __interface_set_down(iface, false);
 914 }
 915
 916 void
 917 interface_update_start(struct interface *iface)
 918 {
 919         interface_ip_update_start(&iface->proto_ip);
 920 }
 921
 922 void
 923 interface_update_complete(struct interface *iface)
 924 {
 925         interface_ip_update_complete(&iface->proto_ip);
 926 }
 927
 928 static void
 929 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 930 {
 931         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 932         vlist_simple_replace(&new->dns_search, &old->dns_search);
 933 }
 934
 935 static void
 936 interface_change_config(struct interface *if_old, struct interface *if_new)
 937 {
 938         struct blob_attr *old_config = if_old->config;
 939         bool reload = false, reload_ip = false;
 940
 941 #define FIELD_CHANGED_STR(field)                                        \
 942                 ((!!if_old->field != !!if_new->field) ||                \
 943                  (if_old->field &&                                      \
 944                   strcmp(if_old->field, if_new->field) != 0))
 945
 946         if (FIELD_CHANGED_STR(parent_ifname)) {
 947                 if (if_old->parent_iface.iface)
 948                         interface_remove_user(&if_old->parent_iface);
 949                 reload = true;
 950         }
 951
 952         if (FIELD_CHANGED_STR(ifname) ||
 953             if_old->proto_handler != if_new->proto_handler)
 954                 reload = true;
 955
 956         if (!if_old->proto_handler->config_params)
 957                 D(INTERFACE, "No config parameters for interface '%s'\n",
 958                   if_old->name);
 959         else if (!uci_blob_check_equal(if_old->config, if_new->config,
 960                                        if_old->proto_handler->config_params))
 961                 reload = true;
 962
 963 #define UPDATE(field, __var) ({                                         \
 964                 bool __changed = (if_old->field != if_new->field);      \
 965                 if_old->field = if_new->field;                          \
 966                 __var |= __changed;                                     \
 967         })
 968
 969         if_old->config = if_new->config;
 970         if (!if_old->config_autostart && if_new->config_autostart)
 971                 if_old->autostart = true;
 972
 973         if_old->device_config = if_new->device_config;
 974         if_old->config_autostart = if_new->config_autostart;
 975         if_old->ifname = if_new->ifname;
 976         if_old->parent_ifname = if_new->parent_ifname;
 977         if_old->proto_handler = if_new->proto_handler;
 978
 979         if_old->proto_ip.no_dns = if_new->proto_ip.no_dns;
 980         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 981
 982         UPDATE(metric, reload_ip);
 983         UPDATE(proto_ip.no_defaultroute, reload_ip);
 984         UPDATE(ip4table, reload_ip);
 985         UPDATE(ip6table, reload_ip);
 986         interface_merge_assignment_data(if_old, if_new);
 987
 988 #undef UPDATE
 989
 990         if (reload) {
 991                 D(INTERFACE, "Reload interface '%s' because of config changes\n",
 992                   if_old->name);
 993                 interface_clear_errors(if_old);
 994                 set_config_state(if_old, IFC_RELOAD);
 995                 goto out;
 996         }
 997
 998         if (reload_ip) {
 999                 interface_ip_set_enabled(&if_old->config_ip, false);
1000                 interface_ip_set_enabled(&if_old->proto_ip, false);
1001                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
1002                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
1003         }
1004
1005         interface_write_resolv_conf();
1006
1007 out:
1008         if_new->config = NULL;
1009         interface_cleanup(if_new);
1010         free(old_config);
1011         free(if_new);
1012 }
1013
1014 static void
1015 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
1016                  struct vlist_node *node_old)
1017 {
1018         struct interface *if_old = container_of(node_old, struct interface, node);
1019         struct interface *if_new = container_of(node_new, struct interface, node);
1020
1021         if (node_old && node_new) {
1022                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
1023                 interface_change_config(if_old, if_new);
1024         } else if (node_old) {
1025                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
1026                 set_config_state(if_old, IFC_REMOVE);
1027         } else if (node_new) {
1028                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
1029                 proto_init_interface(if_new, if_new->config);
1030                 interface_claim_device(if_new);
1031                 netifd_ubus_add_interface(if_new);
1032         }
1033 }
1034
1035
1036 static void __init
1037 interface_init_list(void)
1038 {
1039         vlist_init(&interfaces, avl_strcmp, interface_update);
1040         interfaces.keep_old = true;
1041         interfaces.no_delete = true;
1042 }