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         interface_queue_event(iface, ev);
  83 }
  84
  85 static void
  86 mark_interface_down(struct interface *iface)
  87 {
  88         interface_clear_dns(iface);
  89         vlist_flush_all(&iface->proto_addr);
  90         vlist_flush_all(&iface->proto_route);
  91         if (iface->main_dev.dev)
  92                 device_release(&iface->main_dev);
  93         iface->state = IFS_DOWN;
  94 }
  95
  96 static int
  97 __interface_set_up(struct interface *iface)
  98 {
  99         int ret;
 100
 101         if (iface->state != IFS_DOWN)
 102                 return 0;
 103
 104         if (iface->main_dev.dev) {
 105                 ret = device_claim(&iface->main_dev);
 106                 if (ret)
 107                         return ret;
 108         }
 109
 110         iface->state = IFS_SETUP;
 111         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 112         if (ret) {
 113                 mark_interface_down(iface);
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void
 121 __interface_set_down(struct interface *iface, bool force)
 122 {
 123         interface_clear_errors(iface);
 124
 125         if (iface->state == IFS_DOWN ||
 126                 iface->state == IFS_TEARDOWN)
 127                 return;
 128
 129         iface->state = IFS_TEARDOWN;
 130         interface_event(iface, IFEV_DOWN);
 131         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 132 }
 133
 134 static void
 135 interface_cb(struct device_user *dep, enum device_event ev)
 136 {
 137         struct interface *iface;
 138         bool new_state;
 139
 140         iface = container_of(dep, struct interface, main_dev);
 141         switch (ev) {
 142         case DEV_EVENT_ADD:
 143                 new_state = true;
 144                 break;
 145         case DEV_EVENT_REMOVE:
 146                 new_state = false;
 147                 break;
 148         default:
 149                 return;
 150         }
 151
 152         interface_set_available(iface, new_state);
 153 }
 154
 155 void
 156 interface_set_available(struct interface *iface, bool new_state)
 157 {
 158         if (iface->available == new_state)
 159                 return;
 160
 161         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 162         iface->available = new_state;
 163
 164         if (new_state) {
 165                 if (iface->autostart && !config_init)
 166                         interface_set_up(iface);
 167         } else
 168                 __interface_set_down(iface, true);
 169 }
 170
 171 static void
 172 interface_claim_device(struct interface *iface)
 173 {
 174         struct device *dev;
 175
 176         if (iface->proto_handler &&
 177                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 178                 dev = device_get(iface->ifname, true);
 179                 if (dev)
 180                         device_add_user(&iface->main_dev, dev);
 181         }
 182 }
 183
 184
 185 static void
 186 interface_cleanup(struct interface *iface)
 187 {
 188         interface_clear_dns(iface);
 189         interface_clear_errors(iface);
 190         if (iface->main_dev.dev)
 191                 device_remove_user(&iface->main_dev);
 192         interface_set_proto_state(iface, NULL);
 193 }
 194
 195 static void
 196 interface_do_free(struct interface *iface)
 197 {
 198         interface_cleanup(iface);
 199         free(iface->config);
 200         netifd_ubus_remove_interface(iface);
 201         avl_delete(&interfaces.avl, &iface->node.avl);
 202         free(iface);
 203 }
 204
 205 static void
 206 interface_do_reload(struct interface *iface)
 207 {
 208         interface_cleanup(iface);
 209
 210         interface_claim_device(iface);
 211         proto_init_interface(iface, iface->config);
 212
 213         if (iface->autostart && !config_init)
 214                 interface_set_up(iface);
 215 }
 216
 217 static void
 218 interface_handle_config_change(struct interface *iface)
 219 {
 220         switch(iface->config_state) {
 221         case IFC_NORMAL:
 222                 break;
 223         case IFC_RELOAD:
 224                 interface_do_reload(iface);
 225                 break;
 226         case IFC_REMOVE:
 227                 interface_do_free(iface);
 228                 break;
 229         }
 230 }
 231
 232 static void
 233 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 234 {
 235         struct interface *iface = state->iface;
 236
 237         switch (ev) {
 238         case IFPEV_UP:
 239                 if (iface->state != IFS_SETUP)
 240                         return;
 241
 242                 system_flush_routes();
 243                 iface->state = IFS_UP;
 244                 iface->start_time = system_get_rtime();
 245                 interface_event(iface, IFEV_UP);
 246                 interface_write_resolv_conf();
 247                 break;
 248         case IFPEV_DOWN:
 249                 if (iface->state == IFS_DOWN)
 250                         return;
 251
 252                 system_flush_routes();
 253                 mark_interface_down(iface);
 254                 interface_handle_config_change(iface);
 255                 if (iface->autostart)
 256                         __interface_set_up(iface);
 257                 break;
 258         case IFPEV_LINK_LOST:
 259                 if (iface->state != IFS_UP)
 260                         return;
 261
 262                 iface->state = IFS_SETUP;
 263                 interface_event(iface, IFEV_DOWN);
 264                 break;
 265         }
 266 }
 267
 268 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 269 {
 270         if (iface->proto) {
 271                 iface->proto->free(iface->proto);
 272                 iface->proto = NULL;
 273         }
 274         iface->state = IFS_DOWN;
 275         iface->proto = state;
 276         if (!state)
 277                 return;
 278
 279         state->proto_event = interface_proto_cb;
 280         state->iface = iface;
 281 }
 282
 283 void
 284 interface_init(struct interface *iface, const char *name,
 285                struct blob_attr *config)
 286 {
 287         struct blob_attr *tb[IFACE_ATTR_MAX];
 288         struct blob_attr *cur;
 289         const char *proto_name = NULL;
 290
 291         strncpy(iface->name, name, sizeof(iface->name) - 1);
 292         INIT_LIST_HEAD(&iface->errors);
 293         INIT_LIST_HEAD(&iface->hotplug_list);
 294         INIT_LIST_HEAD(&iface->proto_dns_search);
 295         INIT_LIST_HEAD(&iface->proto_dns_servers);
 296
 297         iface->main_dev.cb = interface_cb;
 298         iface->l3_dev = &iface->main_dev;
 299
 300         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 301                       blob_data(config), blob_len(config));
 302
 303         if ((cur = tb[IFACE_ATTR_PROTO]))
 304                 proto_name = blobmsg_data(cur);
 305
 306         proto_attach_interface(iface, proto_name);
 307
 308         if ((cur = tb[IFACE_ATTR_AUTO]))
 309                 iface->autostart = blobmsg_get_bool(cur);
 310         else
 311                 iface->autostart = true;
 312         iface->config_autostart = iface->autostart;
 313 }
 314
 315 void
 316 interface_add(struct interface *iface, struct blob_attr *config)
 317 {
 318         struct blob_attr *tb[IFACE_ATTR_MAX];
 319         struct blob_attr *cur;
 320
 321         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 322                       blob_data(config), blob_len(config));
 323
 324         if ((cur = tb[IFACE_ATTR_IFNAME]))
 325                 iface->ifname = blobmsg_data(cur);
 326
 327         iface->config = config;
 328         vlist_add(&interfaces, &iface->node);
 329 }
 330
 331 void
 332 interface_remove_link(struct interface *iface, struct device *dev)
 333 {
 334         struct device *mdev = iface->main_dev.dev;
 335
 336         if (mdev && mdev->hotplug_ops) {
 337                 mdev->hotplug_ops->del(mdev, dev);
 338                 return;
 339         }
 340
 341         device_remove_user(&iface->main_dev);
 342 }
 343
 344 int
 345 interface_add_link(struct interface *iface, struct device *dev)
 346 {
 347         struct device *mdev = iface->main_dev.dev;
 348
 349         if (mdev && mdev->hotplug_ops)
 350                 return mdev->hotplug_ops->add(mdev, dev);
 351
 352         if (iface->main_dev.dev)
 353                 interface_remove_link(iface, NULL);
 354
 355         device_add_user(&iface->main_dev, dev);
 356
 357         return 0;
 358 }
 359
 360 int
 361 interface_set_up(struct interface *iface)
 362 {
 363         iface->autostart = true;
 364
 365         if (iface->state != IFS_DOWN)
 366                 return 0;
 367
 368         interface_clear_errors(iface);
 369         if (!iface->available) {
 370                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 371                 return -1;
 372         }
 373
 374         return __interface_set_up(iface);
 375 }
 376
 377 int
 378 interface_set_down(struct interface *iface)
 379 {
 380         if (!iface) {
 381                 vlist_for_each_element(&interfaces, iface, node)
 382                         __interface_set_down(iface, false);
 383         } else {
 384                 iface->autostart = false;
 385                 __interface_set_down(iface, false);
 386         }
 387
 388         return 0;
 389 }
 390
 391 void
 392 interface_start_pending(void)
 393 {
 394         struct interface *iface;
 395
 396         vlist_for_each_element(&interfaces, iface, node) {
 397                 if (iface->available && iface->autostart)
 398                         interface_set_up(iface);
 399         }
 400 }
 401
 402 static void
 403 set_config_state(struct interface *iface, enum interface_config_state s)
 404 {
 405         iface->config_state = s;
 406         if (iface->state == IFS_DOWN)
 407                 interface_handle_config_change(iface);
 408         else
 409                 __interface_set_down(iface, false);
 410 }
 411
 412 static void
 413 interface_change_config(struct interface *if_old, struct interface *if_new)
 414 {
 415         struct blob_attr *old_config = if_old->config;
 416         const char *old_ifname = if_old->ifname;
 417         const struct proto_handler *proto = if_old->proto_handler;
 418
 419         interface_clear_errors(if_old);
 420         if_old->config = if_new->config;
 421         if (!if_old->config_autostart && if_new->config_autostart)
 422                 if_old->autostart = true;
 423
 424         if_old->config_autostart = if_new->config_autostart;
 425         if_old->ifname = if_new->ifname;
 426         if_old->proto_handler = if_new->proto_handler;
 427
 428         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 429                 proto != if_new->proto_handler) {
 430                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 431                   if_old->name);
 432                 goto reload;
 433         }
 434
 435         if (!proto->config_params)
 436                 D(INTERFACE, "No config parameters for interface '%s'\n",
 437                   if_old->name);
 438         else if (!config_check_equal(old_config, if_new->config,
 439                                 proto->config_params)) {
 440                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 441                   if_old->name);
 442                 goto reload;
 443         }
 444
 445         goto out;
 446
 447 reload:
 448         set_config_state(if_old, IFC_RELOAD);
 449 out:
 450         free(old_config);
 451         free(if_new);
 452 }
 453
 454 static void
 455 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 456                  struct vlist_node *node_old)
 457 {
 458         struct interface *if_old = container_of(node_old, struct interface, node);
 459         struct interface *if_new = container_of(node_new, struct interface, node);
 460
 461         if (node_old && node_new) {
 462                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 463                 interface_change_config(if_old, if_new);
 464         } else if (node_old) {
 465                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 466                 set_config_state(if_old, IFC_REMOVE);
 467         } else if (node_new) {
 468                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 469                 interface_claim_device(if_new);
 470                 proto_init_interface(if_new, if_new->config);
 471                 interface_ip_init(if_new);
 472                 netifd_ubus_add_interface(if_new);
 473         }
 474 }
 475
 476
 477 static void __init
 478 interface_init_list(void)
 479 {
 480         vlist_init(&interfaces, avl_strcmp, interface_update,
 481                    struct interface, node, name);
 482         interfaces.keep_old = true;
 483         interfaces.no_delete = true;
 484 }