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 mark_interface_down(struct interface *iface)
  92 {
  93         interface_clear_dns(iface);
  94         vlist_flush_all(&iface->proto_addr);
  95         vlist_flush_all(&iface->proto_route);
  96         if (iface->main_dev.dev)
  97                 device_release(&iface->main_dev);
  98         iface->state = IFS_DOWN;
  99 }
 100
 101 static int
 102 __interface_set_up(struct interface *iface)
 103 {
 104         int ret;
 105
 106         if (iface->state != IFS_DOWN)
 107                 return 0;
 108
 109         if (iface->main_dev.dev) {
 110                 ret = device_claim(&iface->main_dev);
 111                 if (ret)
 112                         return ret;
 113         }
 114
 115         iface->state = IFS_SETUP;
 116         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 117         if (ret) {
 118                 mark_interface_down(iface);
 119                 return ret;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void
 126 __interface_set_down(struct interface *iface, bool force)
 127 {
 128         interface_clear_errors(iface);
 129
 130         if (iface->state == IFS_DOWN ||
 131                 iface->state == IFS_TEARDOWN)
 132                 return;
 133
 134         iface->state = IFS_TEARDOWN;
 135         interface_event(iface, IFEV_DOWN);
 136         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 137 }
 138
 139 static void
 140 interface_cb(struct device_user *dep, enum device_event ev)
 141 {
 142         struct interface *iface;
 143         bool new_state;
 144
 145         iface = container_of(dep, struct interface, main_dev);
 146         switch (ev) {
 147         case DEV_EVENT_ADD:
 148                 new_state = true;
 149                 break;
 150         case DEV_EVENT_REMOVE:
 151                 new_state = false;
 152                 break;
 153         default:
 154                 return;
 155         }
 156
 157         interface_set_available(iface, new_state);
 158 }
 159
 160 void
 161 interface_set_available(struct interface *iface, bool new_state)
 162 {
 163         if (iface->available == new_state)
 164                 return;
 165
 166         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 167         iface->available = new_state;
 168
 169         if (new_state) {
 170                 if (iface->autostart && !config_init)
 171                         interface_set_up(iface);
 172         } else
 173                 __interface_set_down(iface, true);
 174 }
 175
 176 void
 177 interface_add_user(struct interface_user *dep, struct interface *iface)
 178 {
 179         dep->iface = iface;
 180         list_add(&dep->list, &iface->users);
 181         if (iface->state == IFS_UP)
 182                 dep->cb(dep, IFEV_UP);
 183 }
 184
 185 void
 186 interface_remove_user(struct interface_user *dep)
 187 {
 188         list_del_init(&dep->list);
 189         dep->iface = NULL;
 190 }
 191
 192 static void
 193 interface_claim_device(struct interface *iface)
 194 {
 195         struct device *dev;
 196
 197         if (iface->proto_handler &&
 198                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 199                 dev = device_get(iface->ifname, true);
 200                 if (dev)
 201                         device_add_user(&iface->main_dev, dev);
 202         }
 203 }
 204
 205
 206 static void
 207 interface_cleanup(struct interface *iface)
 208 {
 209         struct interface_user *dep, *tmp;
 210
 211         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 212                 interface_remove_user(dep);
 213
 214         interface_clear_dns(iface);
 215         interface_clear_errors(iface);
 216         if (iface->main_dev.dev)
 217                 device_remove_user(&iface->main_dev);
 218         interface_set_proto_state(iface, NULL);
 219 }
 220
 221 static void
 222 interface_do_free(struct interface *iface)
 223 {
 224         interface_cleanup(iface);
 225         free(iface->config);
 226         netifd_ubus_remove_interface(iface);
 227         avl_delete(&interfaces.avl, &iface->node.avl);
 228         free(iface);
 229 }
 230
 231 static void
 232 interface_do_reload(struct interface *iface)
 233 {
 234         interface_cleanup(iface);
 235
 236         interface_claim_device(iface);
 237         proto_init_interface(iface, iface->config);
 238
 239         if (iface->autostart && !config_init)
 240                 interface_set_up(iface);
 241 }
 242
 243 static void
 244 interface_handle_config_change(struct interface *iface)
 245 {
 246         switch(iface->config_state) {
 247         case IFC_NORMAL:
 248                 break;
 249         case IFC_RELOAD:
 250                 interface_do_reload(iface);
 251                 break;
 252         case IFC_REMOVE:
 253                 interface_do_free(iface);
 254                 break;
 255         }
 256 }
 257
 258 static void
 259 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 260 {
 261         struct interface *iface = state->iface;
 262
 263         switch (ev) {
 264         case IFPEV_UP:
 265                 if (iface->state != IFS_SETUP)
 266                         return;
 267
 268                 system_flush_routes();
 269                 iface->state = IFS_UP;
 270                 iface->start_time = system_get_rtime();
 271                 interface_event(iface, IFEV_UP);
 272                 interface_write_resolv_conf();
 273                 break;
 274         case IFPEV_DOWN:
 275                 if (iface->state == IFS_DOWN)
 276                         return;
 277
 278                 system_flush_routes();
 279                 mark_interface_down(iface);
 280                 interface_handle_config_change(iface);
 281                 if (iface->autostart)
 282                         __interface_set_up(iface);
 283                 if (iface->l3_dev->dev)
 284                         device_release(iface->l3_dev);
 285                 break;
 286         case IFPEV_LINK_LOST:
 287                 if (iface->state != IFS_UP)
 288                         return;
 289
 290                 iface->state = IFS_SETUP;
 291                 interface_event(iface, IFEV_DOWN);
 292                 break;
 293         }
 294 }
 295
 296 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 297 {
 298         if (iface->proto) {
 299                 iface->proto->free(iface->proto);
 300                 iface->proto = NULL;
 301         }
 302         iface->state = IFS_DOWN;
 303         iface->proto = state;
 304         if (!state)
 305                 return;
 306
 307         state->proto_event = interface_proto_cb;
 308         state->iface = iface;
 309 }
 310
 311 void
 312 interface_init(struct interface *iface, const char *name,
 313                struct blob_attr *config)
 314 {
 315         struct blob_attr *tb[IFACE_ATTR_MAX];
 316         struct blob_attr *cur;
 317         const char *proto_name = NULL;
 318
 319         strncpy(iface->name, name, sizeof(iface->name) - 1);
 320         INIT_LIST_HEAD(&iface->errors);
 321         INIT_LIST_HEAD(&iface->users);
 322         INIT_LIST_HEAD(&iface->hotplug_list);
 323         INIT_LIST_HEAD(&iface->proto_dns_search);
 324         INIT_LIST_HEAD(&iface->proto_dns_servers);
 325
 326         iface->main_dev.cb = interface_cb;
 327         iface->l3_dev = &iface->main_dev;
 328
 329         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 330                       blob_data(config), blob_len(config));
 331
 332         if ((cur = tb[IFACE_ATTR_PROTO]))
 333                 proto_name = blobmsg_data(cur);
 334
 335         proto_attach_interface(iface, proto_name);
 336
 337         if ((cur = tb[IFACE_ATTR_AUTO]))
 338                 iface->autostart = blobmsg_get_bool(cur);
 339         else
 340                 iface->autostart = true;
 341         iface->config_autostart = iface->autostart;
 342 }
 343
 344 void
 345 interface_add(struct interface *iface, struct blob_attr *config)
 346 {
 347         struct blob_attr *tb[IFACE_ATTR_MAX];
 348         struct blob_attr *cur;
 349
 350         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 351                       blob_data(config), blob_len(config));
 352
 353         if ((cur = tb[IFACE_ATTR_IFNAME]))
 354                 iface->ifname = blobmsg_data(cur);
 355
 356         iface->config = config;
 357         vlist_add(&interfaces, &iface->node);
 358 }
 359
 360 void
 361 interface_remove_link(struct interface *iface, struct device *dev)
 362 {
 363         struct device *mdev = iface->main_dev.dev;
 364
 365         if (mdev && mdev->hotplug_ops) {
 366                 mdev->hotplug_ops->del(mdev, dev);
 367                 return;
 368         }
 369
 370         device_remove_user(&iface->main_dev);
 371 }
 372
 373 int
 374 interface_add_link(struct interface *iface, struct device *dev)
 375 {
 376         struct device *mdev = iface->main_dev.dev;
 377
 378         if (mdev && mdev->hotplug_ops)
 379                 return mdev->hotplug_ops->add(mdev, dev);
 380
 381         if (iface->main_dev.dev)
 382                 interface_remove_link(iface, NULL);
 383
 384         device_add_user(&iface->main_dev, dev);
 385
 386         return 0;
 387 }
 388
 389 int
 390 interface_set_up(struct interface *iface)
 391 {
 392         iface->autostart = true;
 393
 394         if (iface->state != IFS_DOWN)
 395                 return 0;
 396
 397         interface_clear_errors(iface);
 398         if (!iface->available) {
 399                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 400                 return -1;
 401         }
 402
 403         return __interface_set_up(iface);
 404 }
 405
 406 int
 407 interface_set_down(struct interface *iface)
 408 {
 409         if (!iface) {
 410                 vlist_for_each_element(&interfaces, iface, node)
 411                         __interface_set_down(iface, false);
 412         } else {
 413                 iface->autostart = false;
 414                 __interface_set_down(iface, false);
 415         }
 416
 417         return 0;
 418 }
 419
 420 void
 421 interface_start_pending(void)
 422 {
 423         struct interface *iface;
 424
 425         vlist_for_each_element(&interfaces, iface, node) {
 426                 if (iface->available && iface->autostart)
 427                         interface_set_up(iface);
 428         }
 429 }
 430
 431 static void
 432 set_config_state(struct interface *iface, enum interface_config_state s)
 433 {
 434         iface->config_state = s;
 435         if (iface->state == IFS_DOWN)
 436                 interface_handle_config_change(iface);
 437         else
 438                 __interface_set_down(iface, false);
 439 }
 440
 441 static void
 442 interface_change_config(struct interface *if_old, struct interface *if_new)
 443 {
 444         struct blob_attr *old_config = if_old->config;
 445         const char *old_ifname = if_old->ifname;
 446         const struct proto_handler *proto = if_old->proto_handler;
 447
 448         interface_clear_errors(if_old);
 449         if_old->config = if_new->config;
 450         if (!if_old->config_autostart && if_new->config_autostart)
 451                 if_old->autostart = true;
 452
 453         if_old->config_autostart = if_new->config_autostart;
 454         if_old->ifname = if_new->ifname;
 455         if_old->proto_handler = if_new->proto_handler;
 456
 457         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 458                 proto != if_new->proto_handler) {
 459                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 460                   if_old->name);
 461                 goto reload;
 462         }
 463
 464         if (!proto->config_params)
 465                 D(INTERFACE, "No config parameters for interface '%s'\n",
 466                   if_old->name);
 467         else if (!config_check_equal(old_config, if_new->config,
 468                                 proto->config_params)) {
 469                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 470                   if_old->name);
 471                 goto reload;
 472         }
 473
 474         goto out;
 475
 476 reload:
 477         set_config_state(if_old, IFC_RELOAD);
 478 out:
 479         free(old_config);
 480         free(if_new);
 481 }
 482
 483 static void
 484 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 485                  struct vlist_node *node_old)
 486 {
 487         struct interface *if_old = container_of(node_old, struct interface, node);
 488         struct interface *if_new = container_of(node_new, struct interface, node);
 489
 490         if (node_old && node_new) {
 491                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 492                 interface_change_config(if_old, if_new);
 493         } else if (node_old) {
 494                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 495                 set_config_state(if_old, IFC_REMOVE);
 496         } else if (node_new) {
 497                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 498                 interface_claim_device(if_new);
 499                 proto_init_interface(if_new, if_new->config);
 500                 interface_ip_init(if_new);
 501                 netifd_ubus_add_interface(if_new);
 502         }
 503 }
 504
 505
 506 static void __init
 507 interface_init_list(void)
 508 {
 509         vlist_init(&interfaces, avl_strcmp, interface_update,
 510                    struct interface, node, name);
 511         interfaces.keep_old = true;
 512         interfaces.no_delete = true;
 513 }