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