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_set_enabled(&iface->config_ip, false);
 146         interface_ip_flush(&iface->proto_ip);
 147         interface_flush_state(iface);
 148         system_flush_routes();
 149         iface->state = IFS_DOWN;
 150 }
 151
 152 void
 153 __interface_set_down(struct interface *iface, bool force)
 154 {
 155         interface_clear_errors(iface);
 156
 157         if (iface->state == IFS_DOWN ||
 158                 iface->state == IFS_TEARDOWN)
 159                 return;
 160
 161         if (iface->state == IFS_UP)
 162                 interface_event(iface, IFEV_DOWN);
 163         iface->state = IFS_TEARDOWN;
 164         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 165         if (force)
 166                 interface_flush_state(iface);
 167 }
 168
 169 static void
 170 interface_cb(struct device_user *dep, enum device_event ev)
 171 {
 172         struct interface *iface;
 173         bool new_state;
 174
 175         iface = container_of(dep, struct interface, main_dev);
 176         switch (ev) {
 177         case DEV_EVENT_ADD:
 178                 new_state = true;
 179                 break;
 180         case DEV_EVENT_REMOVE:
 181                 new_state = false;
 182                 break;
 183         default:
 184                 return;
 185         }
 186
 187         interface_set_available(iface, new_state);
 188 }
 189
 190 void
 191 interface_set_available(struct interface *iface, bool new_state)
 192 {
 193         if (iface->available == new_state)
 194                 return;
 195
 196         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 197         iface->available = new_state;
 198
 199         if (new_state) {
 200                 if (iface->autostart && !config_init)
 201                         interface_set_up(iface);
 202         } else
 203                 __interface_set_down(iface, true);
 204 }
 205
 206 void
 207 interface_add_user(struct interface_user *dep, struct interface *iface)
 208 {
 209         dep->iface = iface;
 210         list_add(&dep->list, &iface->users);
 211         if (iface->state == IFS_UP)
 212                 dep->cb(dep, IFEV_UP);
 213 }
 214
 215 void
 216 interface_remove_user(struct interface_user *dep)
 217 {
 218         list_del_init(&dep->list);
 219         dep->iface = NULL;
 220 }
 221
 222 static void
 223 interface_claim_device(struct interface *iface)
 224 {
 225         struct device *dev;
 226
 227         if (iface->ifname &&
 228                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 229                 dev = device_get(iface->ifname, true);
 230                 if (dev)
 231                         interface_set_main_dev(iface, dev);
 232         }
 233         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 234                 interface_set_available(iface, true);
 235 }
 236
 237
 238 static void
 239 interface_cleanup(struct interface *iface, bool reload)
 240 {
 241         struct interface_user *dep, *tmp;
 242
 243         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 244                 interface_remove_user(dep);
 245
 246         interface_dequeue_event(iface);
 247         interface_ip_flush(&iface->config_ip);
 248         interface_flush_state(iface);
 249         interface_clear_errors(iface);
 250         if (iface->main_dev.dev &&
 251             (!reload || !iface->main_dev.hotplug))
 252                 interface_set_main_dev(iface, NULL);
 253         interface_set_proto_state(iface, NULL);
 254 }
 255
 256 static void
 257 interface_do_free(struct interface *iface)
 258 {
 259         interface_cleanup(iface, false);
 260         free(iface->config);
 261         netifd_ubus_remove_interface(iface);
 262         avl_delete(&interfaces.avl, &iface->node.avl);
 263         free(iface);
 264 }
 265
 266 static void
 267 interface_do_reload(struct interface *iface)
 268 {
 269         interface_cleanup(iface, true);
 270         proto_init_interface(iface, iface->config);
 271         interface_claim_device(iface);
 272 }
 273
 274 static void
 275 interface_handle_config_change(struct interface *iface)
 276 {
 277         switch(iface->config_state) {
 278         case IFC_NORMAL:
 279                 break;
 280         case IFC_RELOAD:
 281                 interface_do_reload(iface);
 282                 break;
 283         case IFC_REMOVE:
 284                 interface_do_free(iface);
 285                 return;
 286         }
 287         if (iface->autostart && iface->available)
 288                 interface_set_up(iface);
 289 }
 290
 291 static void
 292 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 293 {
 294         struct interface *iface = state->iface;
 295
 296         switch (ev) {
 297         case IFPEV_UP:
 298                 if (iface->state != IFS_SETUP)
 299                         return;
 300
 301                 interface_ip_set_enabled(&iface->config_ip, true);
 302                 system_flush_routes();
 303                 iface->state = IFS_UP;
 304                 iface->start_time = system_get_rtime();
 305                 interface_event(iface, IFEV_UP);
 306                 interface_write_resolv_conf();
 307                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 308                 break;
 309         case IFPEV_DOWN:
 310                 if (iface->state == IFS_DOWN)
 311                         return;
 312
 313                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 314                 mark_interface_down(iface);
 315                 interface_handle_config_change(iface);
 316                 break;
 317         case IFPEV_LINK_LOST:
 318                 if (iface->state != IFS_UP)
 319                         return;
 320
 321                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 322                 mark_interface_down(iface);
 323                 iface->state = IFS_SETUP;
 324                 break;
 325         }
 326 }
 327
 328 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 329 {
 330         if (iface->proto) {
 331                 iface->proto->free(iface->proto);
 332                 iface->proto = NULL;
 333         }
 334         iface->state = IFS_DOWN;
 335         iface->proto = state;
 336         if (!state)
 337                 return;
 338
 339         state->proto_event = interface_proto_cb;
 340         state->iface = iface;
 341 }
 342
 343 void
 344 interface_init(struct interface *iface, const char *name,
 345                struct blob_attr *config)
 346 {
 347         struct blob_attr *tb[IFACE_ATTR_MAX];
 348         struct blob_attr *cur;
 349         const char *proto_name = NULL;
 350
 351         strncpy(iface->name, name, sizeof(iface->name) - 1);
 352         INIT_LIST_HEAD(&iface->errors);
 353         INIT_LIST_HEAD(&iface->users);
 354         INIT_LIST_HEAD(&iface->hotplug_list);
 355         interface_ip_init(iface);
 356         avl_init(&iface->data, avl_strcmp, false, NULL);
 357         iface->config_ip.enabled = false;
 358
 359         iface->main_dev.cb = interface_cb;
 360
 361         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 362                       blob_data(config), blob_len(config));
 363
 364         if ((cur = tb[IFACE_ATTR_PROTO]))
 365                 proto_name = blobmsg_data(cur);
 366
 367         proto_attach_interface(iface, proto_name);
 368
 369         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 370         iface->proto_ip.no_defaultroute =
 371                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 372
 373         iface->config_autostart = iface->autostart;
 374 }
 375
 376 void
 377 interface_add(struct interface *iface, struct blob_attr *config)
 378 {
 379         struct blob_attr *tb[IFACE_ATTR_MAX];
 380         struct blob_attr *cur;
 381
 382         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 383                       blob_data(config), blob_len(config));
 384
 385         if ((cur = tb[IFACE_ATTR_IFNAME]))
 386                 iface->ifname = blobmsg_data(cur);
 387
 388         iface->config = config;
 389         vlist_add(&interfaces, &iface->node, iface->name);
 390 }
 391
 392 void
 393 interface_set_l3_dev(struct interface *iface, struct device *dev)
 394 {
 395         bool enabled = iface->config_ip.enabled;
 396         bool claimed = iface->l3_dev.claimed;
 397
 398         if (iface->l3_dev.dev == dev)
 399                 return;
 400
 401         interface_ip_set_enabled(&iface->config_ip, false);
 402         interface_ip_flush(&iface->proto_ip);
 403         device_add_user(&iface->l3_dev, dev);
 404
 405         if (dev) {
 406                 if (claimed)
 407                         device_claim(&iface->l3_dev);
 408                 interface_ip_set_enabled(&iface->config_ip, enabled);
 409         }
 410 }
 411
 412 void
 413 interface_set_main_dev(struct interface *iface, struct device *dev)
 414 {
 415         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 416         bool claimed = iface->l3_dev.claimed;
 417
 418         if (iface->main_dev.dev == dev)
 419                 return;
 420
 421         if (set_l3)
 422                 interface_set_l3_dev(iface, dev);
 423
 424         device_add_user(&iface->main_dev, dev);
 425         if (claimed)
 426                 device_claim(&iface->l3_dev);
 427
 428         if (!iface->l3_dev.dev)
 429                 interface_set_l3_dev(iface, dev);
 430 }
 431
 432 int
 433 interface_remove_link(struct interface *iface, struct device *dev)
 434 {
 435         struct device *mdev = iface->main_dev.dev;
 436
 437         if (mdev && mdev->hotplug_ops)
 438                 return mdev->hotplug_ops->del(mdev, dev);
 439
 440         if (!iface->main_dev.hotplug)
 441                 return UBUS_STATUS_INVALID_ARGUMENT;
 442
 443         if (dev != iface->main_dev.dev)
 444                 return UBUS_STATUS_INVALID_ARGUMENT;
 445
 446         device_remove_user(&iface->main_dev);
 447         return 0;
 448 }
 449
 450 int
 451 interface_add_link(struct interface *iface, struct device *dev)
 452 {
 453         struct device *mdev = iface->main_dev.dev;
 454
 455         if (mdev == dev)
 456                 return 0;
 457
 458         if (iface->main_dev.hotplug)
 459                 device_remove_user(&iface->main_dev);
 460
 461         if (mdev) {
 462                 if (mdev->hotplug_ops)
 463                         return mdev->hotplug_ops->add(mdev, dev);
 464                 else
 465                         return UBUS_STATUS_NOT_SUPPORTED;
 466         }
 467
 468         interface_set_main_dev(iface, dev);
 469         iface->main_dev.hotplug = true;
 470         return 0;
 471 }
 472
 473 int
 474 interface_set_up(struct interface *iface)
 475 {
 476         int ret;
 477
 478         iface->autostart = true;
 479
 480         if (iface->state != IFS_DOWN)
 481                 return 0;
 482
 483         interface_clear_errors(iface);
 484         if (!iface->available) {
 485                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 486                 return -1;
 487         }
 488
 489         if (iface->main_dev.dev) {
 490                 ret = device_claim(&iface->main_dev);
 491                 if (ret)
 492                         return ret;
 493         }
 494
 495         iface->state = IFS_SETUP;
 496         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 497         if (ret) {
 498                 mark_interface_down(iface);
 499                 return ret;
 500         }
 501
 502         return 0;
 503 }
 504
 505 int
 506 interface_set_down(struct interface *iface)
 507 {
 508         if (!iface) {
 509                 vlist_for_each_element(&interfaces, iface, node)
 510                         __interface_set_down(iface, false);
 511         } else {
 512                 iface->autostart = false;
 513                 __interface_set_down(iface, false);
 514         }
 515
 516         return 0;
 517 }
 518
 519 void
 520 interface_start_pending(void)
 521 {
 522         struct interface *iface;
 523
 524         vlist_for_each_element(&interfaces, iface, node) {
 525                 if (iface->available && iface->autostart)
 526                         interface_set_up(iface);
 527         }
 528 }
 529
 530 static void
 531 set_config_state(struct interface *iface, enum interface_config_state s)
 532 {
 533         iface->config_state = s;
 534         if (iface->state == IFS_DOWN)
 535                 interface_handle_config_change(iface);
 536         else
 537                 __interface_set_down(iface, false);
 538 }
 539
 540 void
 541 interface_update_start(struct interface *iface)
 542 {
 543         interface_ip_update_start(&iface->proto_ip);
 544 }
 545
 546 void
 547 interface_update_complete(struct interface *iface)
 548 {
 549         interface_ip_update_complete(&iface->proto_ip);
 550 }
 551
 552 static void
 553 interface_change_config(struct interface *if_old, struct interface *if_new)
 554 {
 555         struct blob_attr *old_config = if_old->config;
 556         const char *old_ifname = if_old->ifname;
 557         const struct proto_handler *proto = if_old->proto_handler;
 558
 559         interface_clear_errors(if_old);
 560         if_old->config = if_new->config;
 561         if (!if_old->config_autostart && if_new->config_autostart)
 562                 if_old->autostart = true;
 563
 564         if_old->config_autostart = if_new->config_autostart;
 565         if_old->ifname = if_new->ifname;
 566         if_old->proto_handler = if_new->proto_handler;
 567
 568         if ((!!old_ifname != !!if_new->ifname) ||
 569             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 570             proto != if_new->proto_handler) {
 571                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 572                   if_old->name);
 573                 goto reload;
 574         }
 575
 576         if (!proto->config_params)
 577                 D(INTERFACE, "No config parameters for interface '%s'\n",
 578                   if_old->name);
 579         else if (!config_check_equal(old_config, if_new->config,
 580                                 proto->config_params)) {
 581                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 582                   if_old->name);
 583                 goto reload;
 584         }
 585
 586 #define UPDATE(field) ({                                                \
 587                 bool __changed = (if_old->field != if_new->field);      \
 588                 if_old->field = if_new->field;                          \
 589                 __changed;                                              \
 590         })
 591
 592         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 593                 interface_ip_set_enabled(&if_old->config_ip, false);
 594                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 595                 interface_ip_set_enabled(&if_old->proto_ip, false);
 596                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 597         }
 598
 599 #undef UPDATE
 600
 601         goto out;
 602
 603 reload:
 604         set_config_state(if_old, IFC_RELOAD);
 605 out:
 606         free(old_config);
 607         free(if_new);
 608 }
 609
 610 static void
 611 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 612                  struct vlist_node *node_old)
 613 {
 614         struct interface *if_old = container_of(node_old, struct interface, node);
 615         struct interface *if_new = container_of(node_new, struct interface, node);
 616
 617         if (node_old && node_new) {
 618                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 619                 interface_change_config(if_old, if_new);
 620         } else if (node_old) {
 621                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 622                 set_config_state(if_old, IFC_REMOVE);
 623         } else if (node_new) {
 624                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 625                 proto_init_interface(if_new, if_new->config);
 626                 interface_claim_device(if_new);
 627                 netifd_ubus_add_interface(if_new);
 628         }
 629 }
 630
 631
 632 static void __init
 633 interface_init_list(void)
 634 {
 635         vlist_init(&interfaces, avl_strcmp, interface_update);
 636         interfaces.keep_old = true;
 637         interfaces.no_delete = true;
 638 }