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_PEERDNS,
  36         IFACE_ATTR_DNS,
  37         IFACE_ATTR_DNS_SEARCH,
  38         IFACE_ATTR_METRIC,
  39         IFACE_ATTR_MAX
  40 };
  41
  42 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  43         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  44         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  45         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  46         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  47         [IFACE_ATTR_PEERDNS] = { .name = "peerdns", .type = BLOBMSG_TYPE_BOOL },
  48         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  49         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  50         [IFACE_ATTR_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  51 };
  52
  53 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
  54         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
  55 };
  56
  57 const struct config_param_list interface_attr_list = {
  58         .n_params = IFACE_ATTR_MAX,
  59         .params = iface_attrs,
  60         .info = iface_attr_info,
  61 };
  62
  63 static void
  64 interface_clear_errors(struct interface *iface)
  65 {
  66         struct interface_error *error, *tmp;
  67
  68         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  69                 list_del(&error->list);
  70                 free(error);
  71         }
  72 }
  73
  74 void interface_add_error(struct interface *iface, const char *subsystem,
  75                          const char *code, const char **data, int n_data)
  76 {
  77         struct interface_error *error;
  78         int i, len = 0;
  79         int *datalen = NULL;
  80         char *dest;
  81
  82         if (n_data) {
  83                 len = n_data * sizeof(char *);
  84                 datalen = alloca(len);
  85                 for (i = 0; i < n_data; i++) {
  86                         datalen[i] = strlen(data[i]) + 1;
  87                         len += datalen[i];
  88                 }
  89         }
  90
  91         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  92         if (!error)
  93                 return;
  94
  95         list_add_tail(&error->list, &iface->errors);
  96         error->subsystem = subsystem;
  97         error->code = code;
  98
  99         dest = (char *) &error->data[n_data + 1];
 100         for (i = 0; i < n_data; i++) {
 101                 error->data[i] = dest;
 102                 memcpy(dest, data[i], datalen[i]);
 103                 dest += datalen[i];
 104         }
 105         error->data[n_data] = NULL;
 106 }
 107
 108 static void
 109 interface_data_del(struct interface *iface, struct interface_data *data)
 110 {
 111         avl_delete(&iface->data, &data->node);
 112         free(data);
 113 }
 114
 115 static void
 116 interface_data_flush(struct interface *iface)
 117 {
 118         struct interface_data *d, *tmp;
 119
 120         avl_for_each_element_safe(&iface->data, d, node, tmp)
 121                 interface_data_del(iface, d);
 122 }
 123
 124 int
 125 interface_add_data(struct interface *iface, const struct blob_attr *data)
 126 {
 127         struct interface_data *n, *o;
 128
 129         if (!blobmsg_check_attr(data, true))
 130                 return UBUS_STATUS_INVALID_ARGUMENT;
 131
 132         n = calloc(1, sizeof(*n) + blob_pad_len(data));
 133         memcpy(n->data, data, blob_pad_len(data));
 134         n->node.key = blobmsg_name(data);
 135
 136         o = avl_find_element(&iface->data, n->node.key, o, node);
 137         if (o)
 138                 interface_data_del(iface, o);
 139
 140         avl_insert(&iface->data, &n->node);
 141         return 0;
 142 }
 143
 144 static void
 145 interface_event(struct interface *iface, enum interface_event ev)
 146 {
 147         struct interface_user *dep, *tmp;
 148
 149         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 150                 dep->cb(dep, iface, ev);
 151
 152         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 153                 dep->cb(dep, iface, ev);
 154 }
 155
 156 static void
 157 interface_flush_state(struct interface *iface)
 158 {
 159         if (iface->main_dev.dev)
 160                 device_release(&iface->main_dev);
 161         if (iface->l3_dev.dev)
 162                 device_release(&iface->l3_dev);
 163         interface_data_flush(iface);
 164 }
 165
 166 static void
 167 mark_interface_down(struct interface *iface)
 168 {
 169         if (iface->state == IFS_UP)
 170                 interface_event(iface, IFEV_DOWN);
 171         interface_ip_set_enabled(&iface->config_ip, false);
 172         interface_ip_flush(&iface->proto_ip);
 173         interface_flush_state(iface);
 174         system_flush_routes();
 175         iface->state = IFS_DOWN;
 176 }
 177
 178 void
 179 __interface_set_down(struct interface *iface, bool force)
 180 {
 181         interface_clear_errors(iface);
 182
 183         if (iface->state == IFS_DOWN ||
 184                 iface->state == IFS_TEARDOWN)
 185                 return;
 186
 187         if (iface->state == IFS_UP)
 188                 interface_event(iface, IFEV_DOWN);
 189         iface->state = IFS_TEARDOWN;
 190         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 191         if (force)
 192                 interface_flush_state(iface);
 193 }
 194
 195 static void
 196 interface_cb(struct device_user *dep, enum device_event ev)
 197 {
 198         struct interface *iface;
 199         bool new_state;
 200
 201         iface = container_of(dep, struct interface, main_dev);
 202         switch (ev) {
 203         case DEV_EVENT_ADD:
 204                 new_state = true;
 205                 break;
 206         case DEV_EVENT_REMOVE:
 207                 new_state = false;
 208                 break;
 209         default:
 210                 return;
 211         }
 212
 213         interface_set_available(iface, new_state);
 214 }
 215
 216 void
 217 interface_set_available(struct interface *iface, bool new_state)
 218 {
 219         if (iface->available == new_state)
 220                 return;
 221
 222         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 223         iface->available = new_state;
 224
 225         if (new_state) {
 226                 if (iface->autostart && !config_init)
 227                         interface_set_up(iface);
 228         } else
 229                 __interface_set_down(iface, true);
 230 }
 231
 232 void
 233 interface_add_user(struct interface_user *dep, struct interface *iface)
 234 {
 235         if (!iface) {
 236                 list_add(&dep->list, &iface_all_users);
 237                 return;
 238         }
 239
 240         dep->iface = iface;
 241         list_add(&dep->list, &iface->users);
 242         if (iface->state == IFS_UP)
 243                 dep->cb(dep, iface, IFEV_UP);
 244 }
 245
 246 void
 247 interface_remove_user(struct interface_user *dep)
 248 {
 249         list_del_init(&dep->list);
 250         dep->iface = NULL;
 251 }
 252
 253 static void
 254 interface_claim_device(struct interface *iface)
 255 {
 256         struct device *dev;
 257
 258         if (iface->ifname &&
 259                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 260                 dev = device_get(iface->ifname, true);
 261                 if (dev)
 262                         interface_set_main_dev(iface, dev);
 263         }
 264         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 265                 interface_set_available(iface, true);
 266 }
 267
 268
 269 static void
 270 interface_cleanup(struct interface *iface, bool reload)
 271 {
 272         struct interface_user *dep, *tmp;
 273
 274         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 275                 interface_remove_user(dep);
 276
 277         interface_ip_flush(&iface->config_ip);
 278         interface_flush_state(iface);
 279         interface_clear_errors(iface);
 280         if (iface->main_dev.dev &&
 281             (!reload || !iface->main_dev.hotplug))
 282                 interface_set_main_dev(iface, NULL);
 283         interface_set_proto_state(iface, NULL);
 284 }
 285
 286 static void
 287 interface_do_free(struct interface *iface)
 288 {
 289         interface_event(iface, IFEV_FREE);
 290         interface_cleanup(iface, false);
 291         free(iface->config);
 292         netifd_ubus_remove_interface(iface);
 293         avl_delete(&interfaces.avl, &iface->node.avl);
 294         free(iface);
 295 }
 296
 297 static void
 298 interface_do_reload(struct interface *iface)
 299 {
 300         interface_event(iface, IFEV_RELOAD);
 301         interface_cleanup(iface, true);
 302         proto_init_interface(iface, iface->config);
 303         interface_claim_device(iface);
 304 }
 305
 306 static void
 307 interface_handle_config_change(struct interface *iface)
 308 {
 309         enum interface_config_state state = iface->config_state;
 310
 311         iface->config_state = IFC_NORMAL;
 312         switch(state) {
 313         case IFC_NORMAL:
 314                 break;
 315         case IFC_RELOAD:
 316                 interface_do_reload(iface);
 317                 break;
 318         case IFC_REMOVE:
 319                 interface_do_free(iface);
 320                 return;
 321         }
 322         if (iface->autostart && iface->available)
 323                 interface_set_up(iface);
 324 }
 325
 326 static void
 327 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 328 {
 329         struct interface *iface = state->iface;
 330
 331         switch (ev) {
 332         case IFPEV_UP:
 333                 if (iface->state != IFS_SETUP)
 334                         return;
 335
 336                 interface_ip_set_enabled(&iface->config_ip, true);
 337                 system_flush_routes();
 338                 iface->state = IFS_UP;
 339                 iface->start_time = system_get_rtime();
 340                 interface_event(iface, IFEV_UP);
 341                 interface_write_resolv_conf();
 342                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 343                 break;
 344         case IFPEV_DOWN:
 345                 if (iface->state == IFS_DOWN)
 346                         return;
 347
 348                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 349                 mark_interface_down(iface);
 350                 interface_handle_config_change(iface);
 351                 break;
 352         case IFPEV_LINK_LOST:
 353                 if (iface->state != IFS_UP)
 354                         return;
 355
 356                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 357                 mark_interface_down(iface);
 358                 iface->state = IFS_SETUP;
 359                 break;
 360         }
 361 }
 362
 363 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 364 {
 365         if (iface->proto) {
 366                 iface->proto->free(iface->proto);
 367                 iface->proto = NULL;
 368         }
 369         iface->state = IFS_DOWN;
 370         iface->proto = state;
 371         if (!state)
 372                 return;
 373
 374         state->proto_event = interface_proto_cb;
 375         state->iface = iface;
 376 }
 377
 378 void
 379 interface_init(struct interface *iface, const char *name,
 380                struct blob_attr *config)
 381 {
 382         struct blob_attr *tb[IFACE_ATTR_MAX];
 383         struct blob_attr *cur;
 384         const char *proto_name = NULL;
 385
 386         strncpy(iface->name, name, sizeof(iface->name) - 1);
 387         INIT_LIST_HEAD(&iface->errors);
 388         INIT_LIST_HEAD(&iface->users);
 389         INIT_LIST_HEAD(&iface->hotplug_list);
 390         interface_ip_init(iface);
 391         avl_init(&iface->data, avl_strcmp, false, NULL);
 392         iface->config_ip.enabled = false;
 393
 394         iface->main_dev.cb = interface_cb;
 395
 396         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 397                       blob_data(config), blob_len(config));
 398
 399         if ((cur = tb[IFACE_ATTR_PROTO]))
 400                 proto_name = blobmsg_data(cur);
 401
 402         proto_attach_interface(iface, proto_name);
 403
 404         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 405         iface->proto_ip.no_defaultroute =
 406                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 407         iface->proto_ip.no_dns =
 408                 !blobmsg_get_bool_default(tb[IFACE_ATTR_PEERDNS], true);
 409
 410         if ((cur = tb[IFACE_ATTR_DNS]))
 411                 interface_add_dns_server_list(&iface->config_ip, cur);
 412
 413         if ((cur = tb[IFACE_ATTR_DNS_SEARCH]))
 414                 interface_add_dns_search_list(&iface->config_ip, cur);
 415
 416         if ((cur = tb[IFACE_ATTR_METRIC]))
 417                 iface->metric = blobmsg_get_u32(cur);
 418
 419         iface->config_autostart = iface->autostart;
 420 }
 421
 422 void
 423 interface_add(struct interface *iface, struct blob_attr *config)
 424 {
 425         struct blob_attr *tb[IFACE_ATTR_MAX];
 426         struct blob_attr *cur;
 427
 428         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 429                       blob_data(config), blob_len(config));
 430
 431         if ((cur = tb[IFACE_ATTR_IFNAME]))
 432                 iface->ifname = blobmsg_data(cur);
 433
 434         iface->config = config;
 435         vlist_add(&interfaces, &iface->node, iface->name);
 436 }
 437
 438 void
 439 interface_set_l3_dev(struct interface *iface, struct device *dev)
 440 {
 441         bool enabled = iface->config_ip.enabled;
 442         bool claimed = iface->l3_dev.claimed;
 443
 444         if (iface->l3_dev.dev == dev)
 445                 return;
 446
 447         interface_ip_set_enabled(&iface->config_ip, false);
 448         interface_ip_flush(&iface->proto_ip);
 449         device_add_user(&iface->l3_dev, dev);
 450
 451         if (dev) {
 452                 if (claimed)
 453                         device_claim(&iface->l3_dev);
 454                 interface_ip_set_enabled(&iface->config_ip, enabled);
 455         }
 456 }
 457
 458 void
 459 interface_set_main_dev(struct interface *iface, struct device *dev)
 460 {
 461         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 462         bool claimed = iface->l3_dev.claimed;
 463
 464         if (iface->main_dev.dev == dev)
 465                 return;
 466
 467         if (set_l3)
 468                 interface_set_l3_dev(iface, dev);
 469
 470         device_add_user(&iface->main_dev, dev);
 471         if (claimed)
 472                 device_claim(&iface->l3_dev);
 473
 474         if (!iface->l3_dev.dev)
 475                 interface_set_l3_dev(iface, dev);
 476 }
 477
 478 int
 479 interface_remove_link(struct interface *iface, struct device *dev)
 480 {
 481         struct device *mdev = iface->main_dev.dev;
 482
 483         if (mdev && mdev->hotplug_ops)
 484                 return mdev->hotplug_ops->del(mdev, dev);
 485
 486         if (!iface->main_dev.hotplug)
 487                 return UBUS_STATUS_INVALID_ARGUMENT;
 488
 489         if (dev != iface->main_dev.dev)
 490                 return UBUS_STATUS_INVALID_ARGUMENT;
 491
 492         device_remove_user(&iface->main_dev);
 493         return 0;
 494 }
 495
 496 int
 497 interface_add_link(struct interface *iface, struct device *dev)
 498 {
 499         struct device *mdev = iface->main_dev.dev;
 500
 501         if (mdev == dev)
 502                 return 0;
 503
 504         if (iface->main_dev.hotplug)
 505                 device_remove_user(&iface->main_dev);
 506
 507         if (mdev) {
 508                 if (mdev->hotplug_ops)
 509                         return mdev->hotplug_ops->add(mdev, dev);
 510                 else
 511                         return UBUS_STATUS_NOT_SUPPORTED;
 512         }
 513
 514         interface_set_main_dev(iface, dev);
 515         iface->main_dev.hotplug = true;
 516         return 0;
 517 }
 518
 519 int
 520 interface_set_up(struct interface *iface)
 521 {
 522         int ret;
 523
 524         iface->autostart = true;
 525
 526         if (iface->state != IFS_DOWN)
 527                 return 0;
 528
 529         interface_clear_errors(iface);
 530         if (!iface->available) {
 531                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 532                 return -1;
 533         }
 534
 535         if (iface->main_dev.dev) {
 536                 ret = device_claim(&iface->main_dev);
 537                 if (ret)
 538                         return ret;
 539         }
 540
 541         iface->state = IFS_SETUP;
 542         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 543         if (ret) {
 544                 mark_interface_down(iface);
 545                 return ret;
 546         }
 547
 548         return 0;
 549 }
 550
 551 int
 552 interface_set_down(struct interface *iface)
 553 {
 554         if (!iface) {
 555                 vlist_for_each_element(&interfaces, iface, node)
 556                         __interface_set_down(iface, false);
 557         } else {
 558                 iface->autostart = false;
 559                 __interface_set_down(iface, false);
 560         }
 561
 562         return 0;
 563 }
 564
 565 void
 566 interface_start_pending(void)
 567 {
 568         struct interface *iface;
 569
 570         vlist_for_each_element(&interfaces, iface, node) {
 571                 if (iface->available && iface->autostart)
 572                         interface_set_up(iface);
 573         }
 574 }
 575
 576 static void
 577 set_config_state(struct interface *iface, enum interface_config_state s)
 578 {
 579         iface->config_state = s;
 580         if (iface->state == IFS_DOWN)
 581                 interface_handle_config_change(iface);
 582         else
 583                 __interface_set_down(iface, false);
 584 }
 585
 586 void
 587 interface_update_start(struct interface *iface)
 588 {
 589         interface_ip_update_start(&iface->proto_ip);
 590 }
 591
 592 void
 593 interface_update_complete(struct interface *iface)
 594 {
 595         interface_ip_update_complete(&iface->proto_ip);
 596 }
 597
 598 static void
 599 interface_replace_dns(struct interface_ip_settings *new, struct interface_ip_settings *old)
 600 {
 601         vlist_simple_replace(&new->dns_servers, &old->dns_servers);
 602         vlist_simple_replace(&new->dns_search, &old->dns_search);
 603 }
 604
 605 static void
 606 interface_change_config(struct interface *if_old, struct interface *if_new)
 607 {
 608         struct blob_attr *old_config = if_old->config;
 609         const char *old_ifname = if_old->ifname;
 610         const struct proto_handler *proto = if_old->proto_handler;
 611
 612         interface_clear_errors(if_old);
 613         if_old->config = if_new->config;
 614         if (!if_old->config_autostart && if_new->config_autostart)
 615                 if_old->autostart = true;
 616
 617         if_old->config_autostart = if_new->config_autostart;
 618         if_old->ifname = if_new->ifname;
 619         if_old->proto_handler = if_new->proto_handler;
 620
 621         if ((!!old_ifname != !!if_new->ifname) ||
 622             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 623             proto != if_new->proto_handler) {
 624                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 625                   if_old->name);
 626                 goto reload;
 627         }
 628
 629         if (!proto->config_params)
 630                 D(INTERFACE, "No config parameters for interface '%s'\n",
 631                   if_old->name);
 632         else if (!config_check_equal(old_config, if_new->config,
 633                                 proto->config_params)) {
 634                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 635                   if_old->name);
 636                 goto reload;
 637         }
 638
 639 #define UPDATE(field) ({                                                \
 640                 bool __changed = (if_old->field != if_new->field);      \
 641                 if_old->field = if_new->field;                          \
 642                 __changed;                                              \
 643         })
 644
 645         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 646                 interface_ip_set_enabled(&if_old->config_ip, false);
 647                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 648                 interface_ip_set_enabled(&if_old->proto_ip, false);
 649                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 650         }
 651
 652         UPDATE(proto_ip.no_dns);
 653         interface_replace_dns(&if_old->config_ip, &if_new->config_ip);
 654         interface_write_resolv_conf();
 655
 656 #undef UPDATE
 657
 658         goto out;
 659
 660 reload:
 661         set_config_state(if_old, IFC_RELOAD);
 662 out:
 663         free(old_config);
 664         free(if_new);
 665 }
 666
 667 static void
 668 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 669                  struct vlist_node *node_old)
 670 {
 671         struct interface *if_old = container_of(node_old, struct interface, node);
 672         struct interface *if_new = container_of(node_new, struct interface, node);
 673
 674         if (node_old && node_new) {
 675                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 676                 interface_change_config(if_old, if_new);
 677         } else if (node_old) {
 678                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 679                 set_config_state(if_old, IFC_REMOVE);
 680         } else if (node_new) {
 681                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 682                 proto_init_interface(if_new, if_new->config);
 683                 interface_claim_device(if_new);
 684                 netifd_ubus_add_interface(if_new);
 685         }
 686 }
 687
 688
 689 static void __init
 690 interface_init_list(void)
 691 {
 692         vlist_init(&interfaces, avl_strcmp, interface_update);
 693         interfaces.keep_old = true;
 694         interfaces.no_delete = true;
 695 }