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