interface.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "device.h"
   7 #include "interface.h"
   8 #include "interface-ip.h"
   9 #include "proto.h"
  10 #include "ubus.h"
  11 #include "config.h"
  12 #include "system.h"
  13
  14 struct vlist_tree interfaces;
  15
  16 enum {
  17         IFACE_ATTR_IFNAME,
  18         IFACE_ATTR_PROTO,
  19         IFACE_ATTR_AUTO,
  20         IFACE_ATTR_DEFAULTROUTE,
  21         IFACE_ATTR_METRIC,
  22         IFACE_ATTR_MAX
  23 };
  24
  25 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  26         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  27         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  29         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  30         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  31 };
  32
  33 const struct config_param_list interface_attr_list = {
  34         .n_params = IFACE_ATTR_MAX,
  35         .params = iface_attrs,
  36 };
  37
  38 static void
  39 interface_clear_errors(struct interface *iface)
  40 {
  41         struct interface_error *error, *tmp;
  42
  43         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  44                 list_del(&error->list);
  45                 free(error);
  46         }
  47 }
  48
  49 void interface_add_error(struct interface *iface, const char *subsystem,
  50                          const char *code, const char **data, int n_data)
  51 {
  52         struct interface_error *error;
  53         int i, len = 0;
  54         int *datalen = NULL;
  55         char *dest;
  56
  57         if (n_data) {
  58                 len = n_data * sizeof(char *);
  59                 datalen = alloca(len);
  60                 for (i = 0; i < n_data; i++) {
  61                         datalen[i] = strlen(data[i]) + 1;
  62                         len += datalen[i];
  63                 }
  64         }
  65
  66         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  67         if (!error)
  68                 return;
  69
  70         list_add_tail(&error->list, &iface->errors);
  71         error->subsystem = subsystem;
  72         error->code = code;
  73
  74         dest = (char *) &error->data[n_data + 1];
  75         for (i = 0; i < n_data; i++) {
  76                 error->data[i] = dest;
  77                 memcpy(dest, data[i], datalen[i]);
  78                 dest += datalen[i];
  79         }
  80         error->data[n_data] = NULL;
  81 }
  82
  83 static void
  84 interface_data_del(struct interface *iface, struct interface_data *data)
  85 {
  86         avl_delete(&iface->data, &data->node);
  87         free(data);
  88 }
  89
  90 static void
  91 interface_data_flush(struct interface *iface)
  92 {
  93         struct interface_data *d, *tmp;
  94
  95         avl_for_each_element_safe(&iface->data, d, node, tmp)
  96                 interface_data_del(iface, d);
  97 }
  98
  99 int
 100 interface_add_data(struct interface *iface, const struct blob_attr *data)
 101 {
 102         struct interface_data *n, *o;
 103
 104         if (!blobmsg_check_attr(data, true))
 105                 return UBUS_STATUS_INVALID_ARGUMENT;
 106
 107         n = calloc(1, sizeof(*data) + blob_pad_len(data));
 108         memcpy(n->data, data, blob_pad_len(data));
 109         n->node.key = blobmsg_name(data);
 110
 111         o = avl_find_element(&iface->data, n->node.key, o, node);
 112         if (o)
 113                 interface_data_del(iface, o);
 114
 115         avl_insert(&iface->data, &n->node);
 116         return 0;
 117 }
 118
 119 static void
 120 interface_event(struct interface *iface, enum interface_event ev)
 121 {
 122         struct interface_user *dep, *tmp;
 123
 124         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 125                 dep->cb(dep, IFEV_UP);
 126
 127         interface_queue_event(iface, ev);
 128 }
 129
 130 static void
 131 interface_flush_state(struct interface *iface)
 132 {
 133         if (iface->main_dev.dev)
 134                 device_release(&iface->main_dev);
 135         if (iface->l3_dev.dev)
 136                 device_release(&iface->l3_dev);
 137         interface_data_flush(iface);
 138 }
 139
 140 static void
 141 mark_interface_down(struct interface *iface)
 142 {
 143         if (iface->state == IFS_UP)
 144                 interface_event(iface, IFEV_DOWN);
 145         interface_ip_flush(&iface->config_ip);
 146         interface_ip_flush(&iface->proto_ip);
 147         interface_flush_state(iface);
 148         iface->state = IFS_DOWN;
 149 }
 150
 151 void
 152 __interface_set_down(struct interface *iface, bool force)
 153 {
 154         interface_clear_errors(iface);
 155
 156         if (iface->state == IFS_DOWN ||
 157                 iface->state == IFS_TEARDOWN)
 158                 return;
 159
 160         if (iface->state == IFS_UP)
 161                 interface_event(iface, IFEV_DOWN);
 162         iface->state = IFS_TEARDOWN;
 163         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 164         if (force)
 165                 interface_flush_state(iface);
 166 }
 167
 168 static void
 169 interface_cb(struct device_user *dep, enum device_event ev)
 170 {
 171         struct interface *iface;
 172         bool new_state;
 173
 174         iface = container_of(dep, struct interface, main_dev);
 175         switch (ev) {
 176         case DEV_EVENT_ADD:
 177                 new_state = true;
 178                 break;
 179         case DEV_EVENT_REMOVE:
 180                 new_state = false;
 181                 break;
 182         default:
 183                 return;
 184         }
 185
 186         interface_set_available(iface, new_state);
 187 }
 188
 189 void
 190 interface_set_available(struct interface *iface, bool new_state)
 191 {
 192         if (iface->available == new_state)
 193                 return;
 194
 195         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 196         iface->available = new_state;
 197
 198         if (new_state) {
 199                 if (iface->autostart && !config_init)
 200                         interface_set_up(iface);
 201         } else
 202                 __interface_set_down(iface, true);
 203 }
 204
 205 void
 206 interface_add_user(struct interface_user *dep, struct interface *iface)
 207 {
 208         dep->iface = iface;
 209         list_add(&dep->list, &iface->users);
 210         if (iface->state == IFS_UP)
 211                 dep->cb(dep, IFEV_UP);
 212 }
 213
 214 void
 215 interface_remove_user(struct interface_user *dep)
 216 {
 217         list_del_init(&dep->list);
 218         dep->iface = NULL;
 219 }
 220
 221 static void
 222 interface_claim_device(struct interface *iface)
 223 {
 224         struct device *dev;
 225
 226         if (iface->ifname &&
 227                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 228                 dev = device_get(iface->ifname, true);
 229                 if (dev)
 230                         interface_set_main_dev(iface, dev);
 231         }
 232         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 233                 interface_set_available(iface, true);
 234 }
 235
 236
 237 static void
 238 interface_cleanup(struct interface *iface, bool reload)
 239 {
 240         struct interface_user *dep, *tmp;
 241
 242         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 243                 interface_remove_user(dep);
 244
 245         interface_dequeue_event(iface);
 246         interface_ip_flush(&iface->config_ip);
 247         interface_flush_state(iface);
 248         interface_clear_errors(iface);
 249         if (iface->main_dev.dev &&
 250             (!reload || !iface->main_dev.hotplug))
 251                 interface_set_main_dev(iface, NULL);
 252         interface_set_proto_state(iface, NULL);
 253 }
 254
 255 static void
 256 interface_do_free(struct interface *iface)
 257 {
 258         interface_cleanup(iface, false);
 259         free(iface->config);
 260         netifd_ubus_remove_interface(iface);
 261         avl_delete(&interfaces.avl, &iface->node.avl);
 262         free(iface);
 263 }
 264
 265 static void
 266 interface_do_reload(struct interface *iface)
 267 {
 268         interface_cleanup(iface, true);
 269         proto_init_interface(iface, iface->config);
 270         interface_claim_device(iface);
 271 }
 272
 273 static void
 274 interface_handle_config_change(struct interface *iface)
 275 {
 276         switch(iface->config_state) {
 277         case IFC_NORMAL:
 278                 break;
 279         case IFC_RELOAD:
 280                 interface_do_reload(iface);
 281                 break;
 282         case IFC_REMOVE:
 283                 interface_do_free(iface);
 284                 return;
 285         }
 286         if (iface->autostart && iface->available)
 287                 interface_set_up(iface);
 288 }
 289
 290 static void
 291 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 292 {
 293         struct interface *iface = state->iface;
 294
 295         switch (ev) {
 296         case IFPEV_UP:
 297                 if (iface->state != IFS_SETUP)
 298                         return;
 299
 300                 interface_ip_set_enabled(&iface->config_ip, true);
 301                 system_flush_routes();
 302                 iface->state = IFS_UP;
 303                 iface->start_time = system_get_rtime();
 304                 interface_event(iface, IFEV_UP);
 305                 interface_write_resolv_conf();
 306                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 307                 break;
 308         case IFPEV_DOWN:
 309                 if (iface->state == IFS_DOWN)
 310                         return;
 311
 312                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 313                 interface_ip_set_enabled(&iface->config_ip, false);
 314                 system_flush_routes();
 315                 mark_interface_down(iface);
 316                 interface_handle_config_change(iface);
 317                 break;
 318         case IFPEV_LINK_LOST:
 319                 if (iface->state != IFS_UP)
 320                         return;
 321
 322                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 323                 if (iface->state == IFS_UP)
 324                         interface_event(iface, IFEV_DOWN);
 325                 iface->state = IFS_SETUP;
 326                 break;
 327         }
 328 }
 329
 330 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 331 {
 332         if (iface->proto) {
 333                 iface->proto->free(iface->proto);
 334                 iface->proto = NULL;
 335         }
 336         iface->state = IFS_DOWN;
 337         iface->proto = state;
 338         if (!state)
 339                 return;
 340
 341         state->proto_event = interface_proto_cb;
 342         state->iface = iface;
 343 }
 344
 345 void
 346 interface_init(struct interface *iface, const char *name,
 347                struct blob_attr *config)
 348 {
 349         struct blob_attr *tb[IFACE_ATTR_MAX];
 350         struct blob_attr *cur;
 351         const char *proto_name = NULL;
 352
 353         strncpy(iface->name, name, sizeof(iface->name) - 1);
 354         INIT_LIST_HEAD(&iface->errors);
 355         INIT_LIST_HEAD(&iface->users);
 356         INIT_LIST_HEAD(&iface->hotplug_list);
 357         interface_ip_init(&iface->proto_ip, iface);
 358         interface_ip_init(&iface->config_ip, iface);
 359         avl_init(&iface->data, avl_strcmp, false, NULL);
 360         iface->config_ip.enabled = false;
 361
 362         iface->main_dev.cb = interface_cb;
 363
 364         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 365                       blob_data(config), blob_len(config));
 366
 367         if ((cur = tb[IFACE_ATTR_PROTO]))
 368                 proto_name = blobmsg_data(cur);
 369
 370         proto_attach_interface(iface, proto_name);
 371
 372         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 373         iface->proto_ip.no_defaultroute =
 374                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 375
 376         iface->config_autostart = iface->autostart;
 377 }
 378
 379 void
 380 interface_add(struct interface *iface, struct blob_attr *config)
 381 {
 382         struct blob_attr *tb[IFACE_ATTR_MAX];
 383         struct blob_attr *cur;
 384
 385         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 386                       blob_data(config), blob_len(config));
 387
 388         if ((cur = tb[IFACE_ATTR_IFNAME]))
 389                 iface->ifname = blobmsg_data(cur);
 390
 391         iface->config = config;
 392         vlist_add(&interfaces, &iface->node, iface->name);
 393 }
 394
 395 void
 396 interface_set_l3_dev(struct interface *iface, struct device *dev)
 397 {
 398         bool enabled = iface->config_ip.enabled;
 399         bool claimed = iface->l3_dev.claimed;
 400
 401         if (iface->l3_dev.dev == dev)
 402                 return;
 403
 404         interface_ip_set_enabled(&iface->config_ip, false);
 405         interface_ip_flush(&iface->proto_ip);
 406         device_add_user(&iface->l3_dev, dev);
 407
 408         if (dev) {
 409                 if (claimed)
 410                         device_claim(&iface->l3_dev);
 411                 interface_ip_set_enabled(&iface->config_ip, enabled);
 412         }
 413 }
 414
 415 void
 416 interface_set_main_dev(struct interface *iface, struct device *dev)
 417 {
 418         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 419         bool claimed = iface->l3_dev.claimed;
 420
 421         if (iface->main_dev.dev == dev)
 422                 return;
 423
 424         if (set_l3)
 425                 interface_set_l3_dev(iface, dev);
 426
 427         device_add_user(&iface->main_dev, dev);
 428         if (claimed)
 429                 device_claim(&iface->l3_dev);
 430
 431         if (!iface->l3_dev.dev)
 432                 interface_set_l3_dev(iface, dev);
 433 }
 434
 435 int
 436 interface_remove_link(struct interface *iface, struct device *dev)
 437 {
 438         struct device *mdev = iface->main_dev.dev;
 439
 440         if (mdev && mdev->hotplug_ops)
 441                 return mdev->hotplug_ops->del(mdev, dev);
 442
 443         if (!iface->main_dev.hotplug)
 444                 return UBUS_STATUS_INVALID_ARGUMENT;
 445
 446         if (dev != iface->main_dev.dev)
 447                 return UBUS_STATUS_INVALID_ARGUMENT;
 448
 449         device_remove_user(&iface->main_dev);
 450         return 0;
 451 }
 452
 453 int
 454 interface_add_link(struct interface *iface, struct device *dev)
 455 {
 456         struct device *mdev = iface->main_dev.dev;
 457
 458         if (mdev == dev)
 459                 return 0;
 460
 461         if (iface->main_dev.hotplug)
 462                 device_remove_user(&iface->main_dev);
 463
 464         if (mdev) {
 465                 if (mdev->hotplug_ops)
 466                         return mdev->hotplug_ops->add(mdev, dev);
 467                 else
 468                         return UBUS_STATUS_NOT_SUPPORTED;
 469         }
 470
 471         interface_set_main_dev(iface, dev);
 472         iface->main_dev.hotplug = true;
 473         return 0;
 474 }
 475
 476 int
 477 interface_set_up(struct interface *iface)
 478 {
 479         int ret;
 480
 481         iface->autostart = true;
 482
 483         if (iface->state != IFS_DOWN)
 484                 return 0;
 485
 486         interface_clear_errors(iface);
 487         if (!iface->available) {
 488                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 489                 return -1;
 490         }
 491
 492         if (iface->main_dev.dev) {
 493                 ret = device_claim(&iface->main_dev);
 494                 if (ret)
 495                         return ret;
 496         }
 497
 498         iface->state = IFS_SETUP;
 499         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 500         if (ret) {
 501                 mark_interface_down(iface);
 502                 return ret;
 503         }
 504
 505         return 0;
 506 }
 507
 508 int
 509 interface_set_down(struct interface *iface)
 510 {
 511         if (!iface) {
 512                 vlist_for_each_element(&interfaces, iface, node)
 513                         __interface_set_down(iface, false);
 514         } else {
 515                 iface->autostart = false;
 516                 __interface_set_down(iface, false);
 517         }
 518
 519         return 0;
 520 }
 521
 522 void
 523 interface_start_pending(void)
 524 {
 525         struct interface *iface;
 526
 527         vlist_for_each_element(&interfaces, iface, node) {
 528                 if (iface->available && iface->autostart)
 529                         interface_set_up(iface);
 530         }
 531 }
 532
 533 static void
 534 set_config_state(struct interface *iface, enum interface_config_state s)
 535 {
 536         iface->config_state = s;
 537         if (iface->state == IFS_DOWN)
 538                 interface_handle_config_change(iface);
 539         else
 540                 __interface_set_down(iface, false);
 541 }
 542
 543 void
 544 interface_update_start(struct interface *iface)
 545 {
 546         interface_ip_update_start(&iface->proto_ip);
 547 }
 548
 549 void
 550 interface_update_complete(struct interface *iface)
 551 {
 552         struct device_route *route;
 553
 554         interface_ip_update_complete(&iface->proto_ip);
 555         vlist_for_each_element(&iface->config_ip.route, route, node) {
 556                 if (iface->l3_dev.dev) {
 557                         system_add_route(iface->l3_dev.dev, route);
 558                         route->enabled = true;
 559                 }
 560         }
 561 }
 562
 563 static void
 564 interface_change_config(struct interface *if_old, struct interface *if_new)
 565 {
 566         struct blob_attr *old_config = if_old->config;
 567         const char *old_ifname = if_old->ifname;
 568         const struct proto_handler *proto = if_old->proto_handler;
 569
 570         interface_clear_errors(if_old);
 571         if_old->config = if_new->config;
 572         if (!if_old->config_autostart && if_new->config_autostart)
 573                 if_old->autostart = true;
 574
 575         if_old->config_autostart = if_new->config_autostart;
 576         if_old->ifname = if_new->ifname;
 577         if_old->proto_handler = if_new->proto_handler;
 578
 579         if ((!!old_ifname != !!if_new->ifname) ||
 580             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 581             proto != if_new->proto_handler) {
 582                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 583                   if_old->name);
 584                 goto reload;
 585         }
 586
 587         if (!proto->config_params)
 588                 D(INTERFACE, "No config parameters for interface '%s'\n",
 589                   if_old->name);
 590         else if (!config_check_equal(old_config, if_new->config,
 591                                 proto->config_params)) {
 592                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 593                   if_old->name);
 594                 goto reload;
 595         }
 596
 597 #define UPDATE(field) ({                                                \
 598                 bool __changed = (if_old->field != if_new->field);      \
 599                 if_old->field = if_new->field;                          \
 600                 __changed;                                              \
 601         })
 602
 603         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 604                 interface_ip_set_enabled(&if_old->config_ip, false);
 605                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 606                 interface_ip_set_enabled(&if_old->proto_ip, false);
 607                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 608         }
 609
 610 #undef UPDATE
 611
 612         goto out;
 613
 614 reload:
 615         set_config_state(if_old, IFC_RELOAD);
 616 out:
 617         free(old_config);
 618         free(if_new);
 619 }
 620
 621 static void
 622 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 623                  struct vlist_node *node_old)
 624 {
 625         struct interface *if_old = container_of(node_old, struct interface, node);
 626         struct interface *if_new = container_of(node_new, struct interface, node);
 627
 628         if (node_old && node_new) {
 629                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 630                 interface_change_config(if_old, if_new);
 631         } else if (node_old) {
 632                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 633                 set_config_state(if_old, IFC_REMOVE);
 634         } else if (node_new) {
 635                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 636                 proto_init_interface(if_new, if_new->config);
 637                 interface_claim_device(if_new);
 638                 netifd_ubus_add_interface(if_new);
 639         }
 640 }
 641
 642
 643 static void __init
 644 interface_init_list(void)
 645 {
 646         vlist_init(&interfaces, avl_strcmp, interface_update);
 647         interfaces.keep_old = true;
 648         interfaces.no_delete = true;
 649 }