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