interface.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include "netifd.h"
  19 #include "device.h"
  20 #include "interface.h"
  21 #include "interface-ip.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "config.h"
  25 #include "system.h"
  26
  27 struct vlist_tree interfaces;
  28 static LIST_HEAD(iface_all_users);
  29
  30 enum {
  31         IFACE_ATTR_IFNAME,
  32         IFACE_ATTR_PROTO,
  33         IFACE_ATTR_AUTO,
  34         IFACE_ATTR_DEFAULTROUTE,
  35         IFACE_ATTR_METRIC,
  36         IFACE_ATTR_MAX
  37 };
  38
  39 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  40         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  41         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  42         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  43         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  44         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  45 };
  46
  47 const struct config_param_list interface_attr_list = {
  48         .n_params = IFACE_ATTR_MAX,
  49         .params = iface_attrs,
  50 };
  51
  52 static void
  53 interface_clear_errors(struct interface *iface)
  54 {
  55         struct interface_error *error, *tmp;
  56
  57         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  58                 list_del(&error->list);
  59                 free(error);
  60         }
  61 }
  62
  63 void interface_add_error(struct interface *iface, const char *subsystem,
  64                          const char *code, const char **data, int n_data)
  65 {
  66         struct interface_error *error;
  67         int i, len = 0;
  68         int *datalen = NULL;
  69         char *dest;
  70
  71         if (n_data) {
  72                 len = n_data * sizeof(char *);
  73                 datalen = alloca(len);
  74                 for (i = 0; i < n_data; i++) {
  75                         datalen[i] = strlen(data[i]) + 1;
  76                         len += datalen[i];
  77                 }
  78         }
  79
  80         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  81         if (!error)
  82                 return;
  83
  84         list_add_tail(&error->list, &iface->errors);
  85         error->subsystem = subsystem;
  86         error->code = code;
  87
  88         dest = (char *) &error->data[n_data + 1];
  89         for (i = 0; i < n_data; i++) {
  90                 error->data[i] = dest;
  91                 memcpy(dest, data[i], datalen[i]);
  92                 dest += datalen[i];
  93         }
  94         error->data[n_data] = NULL;
  95 }
  96
  97 static void
  98 interface_data_del(struct interface *iface, struct interface_data *data)
  99 {
 100         avl_delete(&iface->data, &data->node);
 101         free(data);
 102 }
 103
 104 static void
 105 interface_data_flush(struct interface *iface)
 106 {
 107         struct interface_data *d, *tmp;
 108
 109         avl_for_each_element_safe(&iface->data, d, node, tmp)
 110                 interface_data_del(iface, d);
 111 }
 112
 113 int
 114 interface_add_data(struct interface *iface, const struct blob_attr *data)
 115 {
 116         struct interface_data *n, *o;
 117
 118         if (!blobmsg_check_attr(data, true))
 119                 return UBUS_STATUS_INVALID_ARGUMENT;
 120
 121         n = calloc(1, sizeof(*data) + blob_pad_len(data));
 122         memcpy(n->data, data, blob_pad_len(data));
 123         n->node.key = blobmsg_name(data);
 124
 125         o = avl_find_element(&iface->data, n->node.key, o, node);
 126         if (o)
 127                 interface_data_del(iface, o);
 128
 129         avl_insert(&iface->data, &n->node);
 130         return 0;
 131 }
 132
 133 static void
 134 interface_event(struct interface *iface, enum interface_event ev)
 135 {
 136         struct interface_user *dep, *tmp;
 137
 138         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 139                 dep->cb(dep, iface, ev);
 140
 141         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 142                 dep->cb(dep, iface, ev);
 143 }
 144
 145 static void
 146 interface_flush_state(struct interface *iface)
 147 {
 148         if (iface->main_dev.dev)
 149                 device_release(&iface->main_dev);
 150         if (iface->l3_dev.dev)
 151                 device_release(&iface->l3_dev);
 152         interface_data_flush(iface);
 153 }
 154
 155 static void
 156 mark_interface_down(struct interface *iface)
 157 {
 158         if (iface->state == IFS_UP)
 159                 interface_event(iface, IFEV_DOWN);
 160         interface_ip_set_enabled(&iface->config_ip, false);
 161         interface_ip_flush(&iface->proto_ip);
 162         interface_flush_state(iface);
 163         system_flush_routes();
 164         iface->state = IFS_DOWN;
 165 }
 166
 167 void
 168 __interface_set_down(struct interface *iface, bool force)
 169 {
 170         interface_clear_errors(iface);
 171
 172         if (iface->state == IFS_DOWN ||
 173                 iface->state == IFS_TEARDOWN)
 174                 return;
 175
 176         if (iface->state == IFS_UP)
 177                 interface_event(iface, IFEV_DOWN);
 178         iface->state = IFS_TEARDOWN;
 179         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 180         if (force)
 181                 interface_flush_state(iface);
 182 }
 183
 184 static void
 185 interface_cb(struct device_user *dep, enum device_event ev)
 186 {
 187         struct interface *iface;
 188         bool new_state;
 189
 190         iface = container_of(dep, struct interface, main_dev);
 191         switch (ev) {
 192         case DEV_EVENT_ADD:
 193                 new_state = true;
 194                 break;
 195         case DEV_EVENT_REMOVE:
 196                 new_state = false;
 197                 break;
 198         default:
 199                 return;
 200         }
 201
 202         interface_set_available(iface, new_state);
 203 }
 204
 205 void
 206 interface_set_available(struct interface *iface, bool new_state)
 207 {
 208         if (iface->available == new_state)
 209                 return;
 210
 211         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 212         iface->available = new_state;
 213
 214         if (new_state) {
 215                 if (iface->autostart && !config_init)
 216                         interface_set_up(iface);
 217         } else
 218                 __interface_set_down(iface, true);
 219 }
 220
 221 void
 222 interface_add_user(struct interface_user *dep, struct interface *iface)
 223 {
 224         if (!iface) {
 225                 list_add(&dep->list, &iface_all_users);
 226                 return;
 227         }
 228
 229         dep->iface = iface;
 230         list_add(&dep->list, &iface->users);
 231         if (iface->state == IFS_UP)
 232                 dep->cb(dep, iface, IFEV_UP);
 233 }
 234
 235 void
 236 interface_remove_user(struct interface_user *dep)
 237 {
 238         list_del_init(&dep->list);
 239         dep->iface = NULL;
 240 }
 241
 242 static void
 243 interface_claim_device(struct interface *iface)
 244 {
 245         struct device *dev;
 246
 247         if (iface->ifname &&
 248                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 249                 dev = device_get(iface->ifname, true);
 250                 if (dev)
 251                         interface_set_main_dev(iface, dev);
 252         }
 253         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 254                 interface_set_available(iface, true);
 255 }
 256
 257
 258 static void
 259 interface_cleanup(struct interface *iface, bool reload)
 260 {
 261         struct interface_user *dep, *tmp;
 262
 263         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 264                 interface_remove_user(dep);
 265
 266         interface_ip_flush(&iface->config_ip);
 267         interface_flush_state(iface);
 268         interface_clear_errors(iface);
 269         if (iface->main_dev.dev &&
 270             (!reload || !iface->main_dev.hotplug))
 271                 interface_set_main_dev(iface, NULL);
 272         interface_set_proto_state(iface, NULL);
 273 }
 274
 275 static void
 276 interface_do_free(struct interface *iface)
 277 {
 278         interface_event(iface, IFEV_FREE);
 279         interface_cleanup(iface, false);
 280         free(iface->config);
 281         netifd_ubus_remove_interface(iface);
 282         avl_delete(&interfaces.avl, &iface->node.avl);
 283         free(iface);
 284 }
 285
 286 static void
 287 interface_do_reload(struct interface *iface)
 288 {
 289         interface_event(iface, IFEV_RELOAD);
 290         interface_cleanup(iface, true);
 291         proto_init_interface(iface, iface->config);
 292         interface_claim_device(iface);
 293 }
 294
 295 static void
 296 interface_handle_config_change(struct interface *iface)
 297 {
 298         switch(iface->config_state) {
 299         case IFC_NORMAL:
 300                 break;
 301         case IFC_RELOAD:
 302                 interface_do_reload(iface);
 303                 break;
 304         case IFC_REMOVE:
 305                 interface_do_free(iface);
 306                 return;
 307         }
 308         if (iface->autostart && iface->available)
 309                 interface_set_up(iface);
 310 }
 311
 312 static void
 313 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 314 {
 315         struct interface *iface = state->iface;
 316
 317         switch (ev) {
 318         case IFPEV_UP:
 319                 if (iface->state != IFS_SETUP)
 320                         return;
 321
 322                 interface_ip_set_enabled(&iface->config_ip, true);
 323                 system_flush_routes();
 324                 iface->state = IFS_UP;
 325                 iface->start_time = system_get_rtime();
 326                 interface_event(iface, IFEV_UP);
 327                 interface_write_resolv_conf();
 328                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 329                 break;
 330         case IFPEV_DOWN:
 331                 if (iface->state == IFS_DOWN)
 332                         return;
 333
 334                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 335                 mark_interface_down(iface);
 336                 interface_handle_config_change(iface);
 337                 break;
 338         case IFPEV_LINK_LOST:
 339                 if (iface->state != IFS_UP)
 340                         return;
 341
 342                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 343                 mark_interface_down(iface);
 344                 iface->state = IFS_SETUP;
 345                 break;
 346         }
 347 }
 348
 349 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 350 {
 351         if (iface->proto) {
 352                 iface->proto->free(iface->proto);
 353                 iface->proto = NULL;
 354         }
 355         iface->state = IFS_DOWN;
 356         iface->proto = state;
 357         if (!state)
 358                 return;
 359
 360         state->proto_event = interface_proto_cb;
 361         state->iface = iface;
 362 }
 363
 364 void
 365 interface_init(struct interface *iface, const char *name,
 366                struct blob_attr *config)
 367 {
 368         struct blob_attr *tb[IFACE_ATTR_MAX];
 369         struct blob_attr *cur;
 370         const char *proto_name = NULL;
 371
 372         strncpy(iface->name, name, sizeof(iface->name) - 1);
 373         INIT_LIST_HEAD(&iface->errors);
 374         INIT_LIST_HEAD(&iface->users);
 375         INIT_LIST_HEAD(&iface->hotplug_list);
 376         interface_ip_init(iface);
 377         avl_init(&iface->data, avl_strcmp, false, NULL);
 378         iface->config_ip.enabled = false;
 379
 380         iface->main_dev.cb = interface_cb;
 381
 382         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 383                       blob_data(config), blob_len(config));
 384
 385         if ((cur = tb[IFACE_ATTR_PROTO]))
 386                 proto_name = blobmsg_data(cur);
 387
 388         proto_attach_interface(iface, proto_name);
 389
 390         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 391         iface->proto_ip.no_defaultroute =
 392                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 393
 394         iface->config_autostart = iface->autostart;
 395 }
 396
 397 void
 398 interface_add(struct interface *iface, struct blob_attr *config)
 399 {
 400         struct blob_attr *tb[IFACE_ATTR_MAX];
 401         struct blob_attr *cur;
 402
 403         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 404                       blob_data(config), blob_len(config));
 405
 406         if ((cur = tb[IFACE_ATTR_IFNAME]))
 407                 iface->ifname = blobmsg_data(cur);
 408
 409         iface->config = config;
 410         vlist_add(&interfaces, &iface->node, iface->name);
 411 }
 412
 413 void
 414 interface_set_l3_dev(struct interface *iface, struct device *dev)
 415 {
 416         bool enabled = iface->config_ip.enabled;
 417         bool claimed = iface->l3_dev.claimed;
 418
 419         if (iface->l3_dev.dev == dev)
 420                 return;
 421
 422         interface_ip_set_enabled(&iface->config_ip, false);
 423         interface_ip_flush(&iface->proto_ip);
 424         device_add_user(&iface->l3_dev, dev);
 425
 426         if (dev) {
 427                 if (claimed)
 428                         device_claim(&iface->l3_dev);
 429                 interface_ip_set_enabled(&iface->config_ip, enabled);
 430         }
 431 }
 432
 433 void
 434 interface_set_main_dev(struct interface *iface, struct device *dev)
 435 {
 436         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 437         bool claimed = iface->l3_dev.claimed;
 438
 439         if (iface->main_dev.dev == dev)
 440                 return;
 441
 442         if (set_l3)
 443                 interface_set_l3_dev(iface, dev);
 444
 445         device_add_user(&iface->main_dev, dev);
 446         if (claimed)
 447                 device_claim(&iface->l3_dev);
 448
 449         if (!iface->l3_dev.dev)
 450                 interface_set_l3_dev(iface, dev);
 451 }
 452
 453 int
 454 interface_remove_link(struct interface *iface, struct device *dev)
 455 {
 456         struct device *mdev = iface->main_dev.dev;
 457
 458         if (mdev && mdev->hotplug_ops)
 459                 return mdev->hotplug_ops->del(mdev, dev);
 460
 461         if (!iface->main_dev.hotplug)
 462                 return UBUS_STATUS_INVALID_ARGUMENT;
 463
 464         if (dev != iface->main_dev.dev)
 465                 return UBUS_STATUS_INVALID_ARGUMENT;
 466
 467         device_remove_user(&iface->main_dev);
 468         return 0;
 469 }
 470
 471 int
 472 interface_add_link(struct interface *iface, struct device *dev)
 473 {
 474         struct device *mdev = iface->main_dev.dev;
 475
 476         if (mdev == dev)
 477                 return 0;
 478
 479         if (iface->main_dev.hotplug)
 480                 device_remove_user(&iface->main_dev);
 481
 482         if (mdev) {
 483                 if (mdev->hotplug_ops)
 484                         return mdev->hotplug_ops->add(mdev, dev);
 485                 else
 486                         return UBUS_STATUS_NOT_SUPPORTED;
 487         }
 488
 489         interface_set_main_dev(iface, dev);
 490         iface->main_dev.hotplug = true;
 491         return 0;
 492 }
 493
 494 int
 495 interface_set_up(struct interface *iface)
 496 {
 497         int ret;
 498
 499         iface->autostart = true;
 500
 501         if (iface->state != IFS_DOWN)
 502                 return 0;
 503
 504         interface_clear_errors(iface);
 505         if (!iface->available) {
 506                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 507                 return -1;
 508         }
 509
 510         if (iface->main_dev.dev) {
 511                 ret = device_claim(&iface->main_dev);
 512                 if (ret)
 513                         return ret;
 514         }
 515
 516         iface->state = IFS_SETUP;
 517         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 518         if (ret) {
 519                 mark_interface_down(iface);
 520                 return ret;
 521         }
 522
 523         return 0;
 524 }
 525
 526 int
 527 interface_set_down(struct interface *iface)
 528 {
 529         if (!iface) {
 530                 vlist_for_each_element(&interfaces, iface, node)
 531                         __interface_set_down(iface, false);
 532         } else {
 533                 iface->autostart = false;
 534                 __interface_set_down(iface, false);
 535         }
 536
 537         return 0;
 538 }
 539
 540 void
 541 interface_start_pending(void)
 542 {
 543         struct interface *iface;
 544
 545         vlist_for_each_element(&interfaces, iface, node) {
 546                 if (iface->available && iface->autostart)
 547                         interface_set_up(iface);
 548         }
 549 }
 550
 551 static void
 552 set_config_state(struct interface *iface, enum interface_config_state s)
 553 {
 554         iface->config_state = s;
 555         if (iface->state == IFS_DOWN)
 556                 interface_handle_config_change(iface);
 557         else
 558                 __interface_set_down(iface, false);
 559 }
 560
 561 void
 562 interface_update_start(struct interface *iface)
 563 {
 564         interface_ip_update_start(&iface->proto_ip);
 565 }
 566
 567 void
 568 interface_update_complete(struct interface *iface)
 569 {
 570         interface_ip_update_complete(&iface->proto_ip);
 571 }
 572
 573 static void
 574 interface_change_config(struct interface *if_old, struct interface *if_new)
 575 {
 576         struct blob_attr *old_config = if_old->config;
 577         const char *old_ifname = if_old->ifname;
 578         const struct proto_handler *proto = if_old->proto_handler;
 579
 580         interface_clear_errors(if_old);
 581         if_old->config = if_new->config;
 582         if (!if_old->config_autostart && if_new->config_autostart)
 583                 if_old->autostart = true;
 584
 585         if_old->config_autostart = if_new->config_autostart;
 586         if_old->ifname = if_new->ifname;
 587         if_old->proto_handler = if_new->proto_handler;
 588
 589         if ((!!old_ifname != !!if_new->ifname) ||
 590             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 591             proto != if_new->proto_handler) {
 592                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 593                   if_old->name);
 594                 goto reload;
 595         }
 596
 597         if (!proto->config_params)
 598                 D(INTERFACE, "No config parameters for interface '%s'\n",
 599                   if_old->name);
 600         else if (!config_check_equal(old_config, if_new->config,
 601                                 proto->config_params)) {
 602                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 603                   if_old->name);
 604                 goto reload;
 605         }
 606
 607 #define UPDATE(field) ({                                                \
 608                 bool __changed = (if_old->field != if_new->field);      \
 609                 if_old->field = if_new->field;                          \
 610                 __changed;                                              \
 611         })
 612
 613         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 614                 interface_ip_set_enabled(&if_old->config_ip, false);
 615                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 616                 interface_ip_set_enabled(&if_old->proto_ip, false);
 617                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 618         }
 619
 620 #undef UPDATE
 621
 622         goto out;
 623
 624 reload:
 625         set_config_state(if_old, IFC_RELOAD);
 626 out:
 627         free(old_config);
 628         free(if_new);
 629 }
 630
 631 static void
 632 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 633                  struct vlist_node *node_old)
 634 {
 635         struct interface *if_old = container_of(node_old, struct interface, node);
 636         struct interface *if_new = container_of(node_new, struct interface, node);
 637
 638         if (node_old && node_new) {
 639                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 640                 interface_change_config(if_old, if_new);
 641         } else if (node_old) {
 642                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 643                 set_config_state(if_old, IFC_REMOVE);
 644         } else if (node_new) {
 645                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 646                 proto_init_interface(if_new, if_new->config);
 647                 interface_claim_device(if_new);
 648                 netifd_ubus_add_interface(if_new);
 649         }
 650 }
 651
 652
 653 static void __init
 654 interface_init_list(void)
 655 {
 656         vlist_init(&interfaces, avl_strcmp, interface_update);
 657         interfaces.keep_old = true;
 658         interfaces.no_delete = true;
 659 }