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