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