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