ubus.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 #define _GNU_SOURCE
  15
  16 #include <arpa/inet.h>
  17 #include <string.h>
  18 #include <stdio.h>
  19
  20 #include "netifd.h"
  21 #include "interface.h"
  22 #include "proto.h"
  23 #include "ubus.h"
  24 #include "system.h"
  25
  26 static struct ubus_context *ctx = NULL;
  27 static struct blob_buf b;
  28 static struct netifd_fd ubus_fd;
  29 static const char *ubus_path;
  30
  31 /* global object */
  32
  33 static int
  34 netifd_handle_restart(struct ubus_context *ctx, struct ubus_object *obj,
  35                       struct ubus_request_data *req, const char *method,
  36                       struct blob_attr *msg)
  37 {
  38         netifd_restart();
  39         return 0;
  40 }
  41
  42 static int
  43 netifd_handle_reload(struct ubus_context *ctx, struct ubus_object *obj,
  44                      struct ubus_request_data *req, const char *method,
  45                      struct blob_attr *msg)
  46 {
  47         netifd_reload();
  48         return 0;
  49 }
  50
  51 enum {
  52         HR_TARGET,
  53         HR_V6,
  54         __HR_MAX
  55 };
  56
  57 static const struct blobmsg_policy route_policy[__HR_MAX] = {
  58         [HR_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  59         [HR_V6] = { .name = "v6", .type = BLOBMSG_TYPE_BOOL },
  60 };
  61
  62 static int
  63 netifd_add_host_route(struct ubus_context *ctx, struct ubus_object *obj,
  64                       struct ubus_request_data *req, const char *method,
  65                       struct blob_attr *msg)
  66 {
  67         struct blob_attr *tb[__HR_MAX];
  68         struct interface *iface;
  69         union if_addr a;
  70         bool v6 = false;
  71
  72         blobmsg_parse(route_policy, __HR_MAX, tb, blob_data(msg), blob_len(msg));
  73         if (!tb[HR_TARGET])
  74                 return UBUS_STATUS_INVALID_ARGUMENT;
  75
  76         if (tb[HR_V6])
  77                 v6 = blobmsg_get_bool(tb[HR_V6]);
  78
  79         memset(&a, 0, sizeof(a));
  80         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(tb[HR_TARGET]), &a))
  81                 return UBUS_STATUS_INVALID_ARGUMENT;
  82
  83
  84         iface = interface_ip_add_target_route(&a, v6);
  85         if (!iface)
  86                 return UBUS_STATUS_NOT_FOUND;
  87
  88         blob_buf_init(&b, 0);
  89         blobmsg_add_string(&b, "interface", iface->name);
  90         ubus_send_reply(ctx, req, b.head);
  91
  92         return 0;
  93 }
  94
  95 static struct ubus_method main_object_methods[] = {
  96         { .name = "restart", .handler = netifd_handle_restart },
  97         { .name = "reload", .handler = netifd_handle_reload },
  98         UBUS_METHOD("add_host_route", netifd_add_host_route, route_policy),
  99 };
 100
 101 static struct ubus_object_type main_object_type =
 102         UBUS_OBJECT_TYPE("netifd", main_object_methods);
 103
 104 static struct ubus_object main_object = {
 105         .name = "network",
 106         .type = &main_object_type,
 107         .methods = main_object_methods,
 108         .n_methods = ARRAY_SIZE(main_object_methods),
 109 };
 110
 111 enum {
 112         DEV_NAME,
 113         __DEV_MAX,
 114 };
 115
 116 static const struct blobmsg_policy dev_policy[__DEV_MAX] = {
 117         [DEV_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 118 };
 119
 120 static int
 121 netifd_dev_status(struct ubus_context *ctx, struct ubus_object *obj,
 122                   struct ubus_request_data *req, const char *method,
 123                   struct blob_attr *msg)
 124 {
 125         struct device *dev = NULL;
 126         struct blob_attr *tb[__DEV_MAX];
 127
 128         blobmsg_parse(dev_policy, __DEV_MAX, tb, blob_data(msg), blob_len(msg));
 129
 130         if (tb[DEV_NAME]) {
 131                 dev = device_get(blobmsg_data(tb[DEV_NAME]), false);
 132                 if (!dev)
 133                         return UBUS_STATUS_INVALID_ARGUMENT;
 134         }
 135
 136         blob_buf_init(&b, 0);
 137         device_dump_status(&b, dev);
 138         ubus_send_reply(ctx, req, b.head);
 139
 140         return 0;
 141 }
 142
 143 enum {
 144         ALIAS_ATTR_ALIAS,
 145         ALIAS_ATTR_DEV,
 146         __ALIAS_ATTR_MAX,
 147 };
 148
 149 static const struct blobmsg_policy alias_attrs[__ALIAS_ATTR_MAX] = {
 150         [ALIAS_ATTR_ALIAS] = { "alias", BLOBMSG_TYPE_ARRAY },
 151         [ALIAS_ATTR_DEV] = { "device", BLOBMSG_TYPE_STRING },
 152 };
 153
 154 static int
 155 netifd_handle_alias(struct ubus_context *ctx, struct ubus_object *obj,
 156                     struct ubus_request_data *req, const char *method,
 157                     struct blob_attr *msg)
 158 {
 159         struct device *dev = NULL;
 160         struct blob_attr *tb[__ALIAS_ATTR_MAX];
 161         struct blob_attr *cur;
 162         int rem;
 163
 164         blobmsg_parse(alias_attrs, __ALIAS_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 165
 166         if (!tb[ALIAS_ATTR_ALIAS])
 167                 return UBUS_STATUS_INVALID_ARGUMENT;
 168
 169         if ((cur = tb[ALIAS_ATTR_DEV]) != NULL) {
 170                 dev = device_get(blobmsg_data(cur), true);
 171                 if (!dev)
 172                         return UBUS_STATUS_NOT_FOUND;
 173         }
 174
 175         blobmsg_for_each_attr(cur, tb[ALIAS_ATTR_ALIAS], rem) {
 176                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 177                         goto error;
 178
 179                 if (!blobmsg_check_attr(cur, NULL))
 180                         goto error;
 181
 182                 alias_notify_device(blobmsg_data(cur), dev);
 183         }
 184         return 0;
 185
 186 error:
 187         device_free_unused(dev);
 188         return UBUS_STATUS_INVALID_ARGUMENT;
 189 }
 190
 191 static struct ubus_method dev_object_methods[] = {
 192         UBUS_METHOD("status", netifd_dev_status, dev_policy),
 193         UBUS_METHOD("set_alias", netifd_handle_alias, alias_attrs),
 194 };
 195
 196 static struct ubus_object_type dev_object_type =
 197         UBUS_OBJECT_TYPE("device", dev_object_methods);
 198
 199 static struct ubus_object dev_object = {
 200         .name = "network.device",
 201         .type = &dev_object_type,
 202         .methods = dev_object_methods,
 203         .n_methods = ARRAY_SIZE(dev_object_methods),
 204 };
 205
 206 static void
 207 netifd_ubus_add_fd(void)
 208 {
 209         ubus_add_uloop(ctx);
 210         ubus_fd.fd = ctx->sock.fd;
 211         netifd_fd_add(&ubus_fd);
 212 }
 213
 214 static void
 215 netifd_ubus_reconnect_timer(struct uloop_timeout *timeout)
 216 {
 217         static struct uloop_timeout retry = {
 218                 .cb = netifd_ubus_reconnect_timer,
 219         };
 220         int t = 2;
 221
 222         if (ubus_reconnect(ctx, ubus_path) != 0) {
 223                 DPRINTF("failed to reconnect, trying again in %d seconds\n", t);
 224                 uloop_timeout_set(&retry, t * 1000);
 225                 return;
 226         }
 227
 228         DPRINTF("reconnected to ubus, new id: %08x\n", ctx->local_id);
 229         netifd_ubus_add_fd();
 230 }
 231
 232 static void
 233 netifd_ubus_connection_lost(struct ubus_context *ctx)
 234 {
 235         netifd_fd_delete(&ubus_fd);
 236         netifd_ubus_reconnect_timer(NULL);
 237 }
 238
 239 int
 240 netifd_ubus_init(const char *path)
 241 {
 242         int ret;
 243
 244         uloop_init();
 245         ubus_path = path;
 246
 247         ctx = ubus_connect(path);
 248         if (!ctx)
 249                 return -EIO;
 250
 251         DPRINTF("connected as %08x\n", ctx->local_id);
 252         ctx->connection_lost = netifd_ubus_connection_lost;
 253         netifd_ubus_add_fd();
 254
 255         ret = ubus_add_object(ctx, &main_object);
 256         if (ret)
 257                 goto out;
 258
 259         ret = ubus_add_object(ctx, &dev_object);
 260
 261 out:
 262         if (ret != 0)
 263                 fprintf(stderr, "Failed to publish object: %s\n", ubus_strerror(ret));
 264         return ret;
 265 }
 266
 267 void
 268 netifd_ubus_done(void)
 269 {
 270         ubus_free(ctx);
 271 }
 272
 273
 274 /* per-interface object */
 275
 276 static int
 277 netifd_handle_up(struct ubus_context *ctx, struct ubus_object *obj,
 278                  struct ubus_request_data *req, const char *method,
 279                  struct blob_attr *msg)
 280 {
 281         struct interface *iface;
 282
 283         iface = container_of(obj, struct interface, ubus);
 284         interface_set_up(iface);
 285
 286         return 0;
 287 }
 288
 289 static int
 290 netifd_handle_down(struct ubus_context *ctx, struct ubus_object *obj,
 291                    struct ubus_request_data *req, const char *method,
 292                    struct blob_attr *msg)
 293 {
 294         struct interface *iface;
 295
 296         iface = container_of(obj, struct interface, ubus);
 297         interface_set_down(iface);
 298
 299         return 0;
 300 }
 301
 302 static void
 303 netifd_add_interface_errors(struct blob_buf *b, struct interface *iface)
 304 {
 305         struct interface_error *error;
 306         void *e, *e2, *e3;
 307         int i;
 308
 309         e = blobmsg_open_array(b, "errors");
 310         list_for_each_entry(error, &iface->errors, list) {
 311                 e2 = blobmsg_open_table(b, NULL);
 312
 313                 blobmsg_add_string(b, "subsystem", error->subsystem);
 314                 blobmsg_add_string(b, "code", error->code);
 315                 if (error->data[0]) {
 316                         e3 = blobmsg_open_array(b, "data");
 317                         for (i = 0; error->data[i]; i++)
 318                                 blobmsg_add_string(b, NULL, error->data[i]);
 319                         blobmsg_close_array(b, e3);
 320                 }
 321
 322                 blobmsg_close_table(b, e2);
 323         }
 324         blobmsg_close_array(b, e);
 325 }
 326
 327 static void
 328 interface_ip_dump_address_list(struct interface_ip_settings *ip, bool v6)
 329 {
 330         struct device_addr *addr;
 331         char *buf;
 332         void *a;
 333         int buflen = 128;
 334         int af;
 335
 336         vlist_for_each_element(&ip->addr, addr, node) {
 337                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4)
 338                         af = AF_INET;
 339                 else
 340                         af = AF_INET6;
 341
 342                 if (af != (v6 ? AF_INET6 : AF_INET))
 343                         continue;
 344
 345                 a = blobmsg_open_table(&b, NULL);
 346
 347                 buf = blobmsg_alloc_string_buffer(&b, "address", buflen);
 348                 inet_ntop(af, &addr->addr, buf, buflen);
 349                 blobmsg_add_string_buffer(&b);
 350
 351                 blobmsg_add_u32(&b, "mask", addr->mask);
 352
 353                 blobmsg_close_table(&b, a);
 354         }
 355 }
 356
 357 static void
 358 interface_ip_dump_route_list(struct interface_ip_settings *ip)
 359 {
 360         struct device_route *route;
 361         int buflen = 128;
 362         char *buf;
 363         void *r;
 364         int af;
 365
 366         vlist_for_each_element(&ip->route, route, node) {
 367                 if ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4)
 368                         af = AF_INET;
 369                 else
 370                         af = AF_INET6;
 371
 372                 r = blobmsg_open_table(&b, NULL);
 373
 374                 buf = blobmsg_alloc_string_buffer(&b, "target", buflen);
 375                 inet_ntop(af, &route->addr, buf, buflen);
 376                 blobmsg_add_string_buffer(&b);
 377
 378                 blobmsg_add_u32(&b, "mask", route->mask);
 379
 380                 buf = blobmsg_alloc_string_buffer(&b, "nexthop", buflen);
 381                 inet_ntop(af, &route->nexthop, buf, buflen);
 382                 blobmsg_add_string_buffer(&b);
 383
 384                 blobmsg_close_table(&b, r);
 385         }
 386 }
 387
 388 static void
 389 interface_ip_dump_dns_server_list(struct interface_ip_settings *ip)
 390 {
 391         struct dns_server *dns;
 392         int buflen = 128;
 393         char *buf;
 394
 395         vlist_simple_for_each_element(&ip->dns_servers, dns, node) {
 396                 buf = blobmsg_alloc_string_buffer(&b, NULL, buflen);
 397                 inet_ntop(dns->af, &dns->addr, buf, buflen);
 398                 blobmsg_add_string_buffer(&b);
 399         }
 400 }
 401
 402 static void
 403 interface_ip_dump_dns_search_list(struct interface_ip_settings *ip)
 404 {
 405         struct dns_search_domain *dns;
 406
 407         vlist_simple_for_each_element(&ip->dns_search, dns, node) {
 408                 blobmsg_add_string(&b, NULL, dns->name);
 409         }
 410 }
 411
 412 static int
 413 netifd_handle_status(struct ubus_context *ctx, struct ubus_object *obj,
 414                      struct ubus_request_data *req, const char *method,
 415                      struct blob_attr *msg)
 416 {
 417         struct interface *iface;
 418         struct interface_data *data;
 419         struct device *dev;
 420         void *a;
 421
 422         iface = container_of(obj, struct interface, ubus);
 423
 424         blob_buf_init(&b, 0);
 425         blobmsg_add_u8(&b, "up", iface->state == IFS_UP);
 426         blobmsg_add_u8(&b, "pending", iface->state == IFS_SETUP);
 427         blobmsg_add_u8(&b, "available", iface->available);
 428         blobmsg_add_u8(&b, "autostart", iface->autostart);
 429
 430         if (iface->state == IFS_UP) {
 431                 time_t cur = system_get_rtime();
 432                 blobmsg_add_u32(&b, "uptime", cur - iface->start_time);
 433                 blobmsg_add_string(&b, "l3_device", iface->l3_dev.dev->ifname);
 434         }
 435
 436         if (iface->proto_handler)
 437                 blobmsg_add_string(&b, "proto", iface->proto_handler->name);
 438
 439         dev = iface->main_dev.dev;
 440         if (dev && !(iface->proto_handler->flags & PROTO_FLAG_NODEV))
 441                 blobmsg_add_string(&b, "device", dev->ifname);
 442
 443         if (iface->state == IFS_UP) {
 444                 a = blobmsg_open_array(&b, "ipv4-address");
 445                 interface_ip_dump_address_list(&iface->config_ip, false);
 446                 interface_ip_dump_address_list(&iface->proto_ip, false);
 447                 blobmsg_close_array(&b, a);
 448                 a = blobmsg_open_array(&b, "ipv6-address");
 449                 interface_ip_dump_address_list(&iface->config_ip, true);
 450                 interface_ip_dump_address_list(&iface->proto_ip, true);
 451                 blobmsg_close_array(&b, a);
 452                 a = blobmsg_open_array(&b, "route");
 453                 interface_ip_dump_route_list(&iface->config_ip);
 454                 interface_ip_dump_route_list(&iface->proto_ip);
 455                 blobmsg_close_array(&b, a);
 456                 a = blobmsg_open_array(&b, "dns-server");
 457                 interface_ip_dump_dns_server_list(&iface->config_ip);
 458                 interface_ip_dump_dns_server_list(&iface->proto_ip);
 459                 blobmsg_close_array(&b, a);
 460                 a = blobmsg_open_array(&b, "dns-search");
 461                 interface_ip_dump_dns_search_list(&iface->config_ip);
 462                 interface_ip_dump_dns_search_list(&iface->proto_ip);
 463                 blobmsg_close_array(&b, a);
 464         }
 465
 466         a = blobmsg_open_table(&b, "data");
 467         avl_for_each_element(&iface->data, data, node)
 468                 blob_put(&b, blob_id(data->data), blob_data(data->data), blob_len(data->data));
 469
 470         blobmsg_close_table(&b, a);
 471
 472         if (!list_is_empty(&iface->errors))
 473                 netifd_add_interface_errors(&b, iface);
 474
 475         ubus_send_reply(ctx, req, b.head);
 476
 477         return 0;
 478 }
 479
 480 static int
 481 netifd_iface_handle_device(struct ubus_context *ctx, struct ubus_object *obj,
 482                            struct ubus_request_data *req, const char *method,
 483                            struct blob_attr *msg)
 484 {
 485         struct blob_attr *tb[__DEV_MAX];
 486         struct interface *iface;
 487         struct device *dev;
 488         bool add = !strncmp(method, "add", 3);
 489         int ret;
 490
 491         iface = container_of(obj, struct interface, ubus);
 492
 493         blobmsg_parse(dev_policy, __DEV_MAX, tb, blob_data(msg), blob_len(msg));
 494
 495         if (!tb[DEV_NAME])
 496                 return UBUS_STATUS_INVALID_ARGUMENT;
 497
 498         device_lock();
 499
 500         dev = device_get(blobmsg_data(tb[DEV_NAME]), add ? 2 : 0);
 501         if (add && !dev)
 502                 return UBUS_STATUS_NOT_FOUND;
 503
 504         if (add)
 505                 return interface_add_link(iface, dev);
 506         else
 507                 return interface_remove_link(iface, dev);
 508
 509         device_unlock();
 510
 511         return ret;
 512 }
 513
 514
 515 static int
 516 netifd_iface_notify_proto(struct ubus_context *ctx, struct ubus_object *obj,
 517                           struct ubus_request_data *req, const char *method,
 518                           struct blob_attr *msg)
 519 {
 520         struct interface *iface;
 521
 522         iface = container_of(obj, struct interface, ubus);
 523
 524         if (!iface->proto || !iface->proto->notify)
 525                 return UBUS_STATUS_NOT_SUPPORTED;
 526
 527         return iface->proto->notify(iface->proto, msg);
 528 }
 529
 530 static void
 531 netifd_iface_do_remove(struct uloop_timeout *timeout)
 532 {
 533         struct interface *iface;
 534
 535         iface = container_of(timeout, struct interface, remove_timer);
 536         vlist_delete(&interfaces, &iface->node);
 537 }
 538
 539 static int
 540 netifd_iface_remove(struct ubus_context *ctx, struct ubus_object *obj,
 541                     struct ubus_request_data *req, const char *method,
 542                     struct blob_attr *msg)
 543 {
 544         struct interface *iface;
 545
 546         iface = container_of(obj, struct interface, ubus);
 547         if (iface->remove_timer.cb)
 548                 return UBUS_STATUS_INVALID_ARGUMENT;
 549
 550         iface->remove_timer.cb = netifd_iface_do_remove;
 551         uloop_timeout_set(&iface->remove_timer, 100);
 552         return 0;
 553 }
 554
 555 static int
 556 netifd_handle_iface_prepare(struct ubus_context *ctx, struct ubus_object *obj,
 557                             struct ubus_request_data *req, const char *method,
 558                             struct blob_attr *msg)
 559 {
 560         struct interface *iface;
 561         struct device *dev;
 562         const struct device_hotplug_ops *ops;
 563
 564         iface = container_of(obj, struct interface, ubus);
 565         dev = iface->main_dev.dev;
 566         if (!dev)
 567                 return 0;
 568
 569         ops = dev->hotplug_ops;
 570         if (!ops)
 571                 return 0;
 572
 573         return ops->prepare(dev);
 574 }
 575
 576 static int
 577 netifd_handle_set_data(struct ubus_context *ctx, struct ubus_object *obj,
 578                        struct ubus_request_data *req, const char *method,
 579                        struct blob_attr *msg)
 580 {
 581         struct interface *iface;
 582         struct blob_attr *cur;
 583         int rem, ret;
 584
 585         iface = container_of(obj, struct interface, ubus);
 586
 587         blob_for_each_attr(cur, msg, rem) {
 588                 ret = interface_add_data(iface, cur);
 589                 if (ret)
 590                         return ret;
 591         }
 592
 593         return 0;
 594 }
 595
 596 static struct ubus_method iface_object_methods[] = {
 597         { .name = "up", .handler = netifd_handle_up },
 598         { .name = "down", .handler = netifd_handle_down },
 599         { .name = "status", .handler = netifd_handle_status },
 600         { .name = "prepare", .handler = netifd_handle_iface_prepare },
 601         UBUS_METHOD("add_device", netifd_iface_handle_device, dev_policy ),
 602         UBUS_METHOD("remove_device", netifd_iface_handle_device, dev_policy ),
 603         { .name = "notify_proto", .handler = netifd_iface_notify_proto },
 604         { .name = "remove", .handler = netifd_iface_remove },
 605         { .name = "set_data", .handler = netifd_handle_set_data },
 606 };
 607
 608 static struct ubus_object_type iface_object_type =
 609         UBUS_OBJECT_TYPE("netifd_iface", iface_object_methods);
 610
 611
 612 void
 613 netifd_ubus_interface_event(struct interface *iface, bool up)
 614 {
 615         blob_buf_init(&b, 0);
 616         blobmsg_add_string(&b, "action", up ? "ifup" : "ifdown");
 617         blobmsg_add_string(&b, "interface", iface->name);
 618         ubus_send_event(ctx, "network.interface", b.head);
 619 }
 620
 621 void
 622 netifd_ubus_add_interface(struct interface *iface)
 623 {
 624         struct ubus_object *obj = &iface->ubus;
 625         char *name = NULL;
 626
 627         asprintf(&name, "%s.interface.%s", main_object.name, iface->name);
 628         if (!name)
 629                 return;
 630
 631         obj->name = name;
 632         obj->type = &iface_object_type;
 633         obj->methods = iface_object_methods;
 634         obj->n_methods = ARRAY_SIZE(iface_object_methods);
 635         if (ubus_add_object(ctx, &iface->ubus)) {
 636                 DPRINTF("failed to publish ubus object for interface '%s'\n", iface->name);
 637                 free(name);
 638                 obj->name = NULL;
 639         }
 640 }
 641
 642 void
 643 netifd_ubus_remove_interface(struct interface *iface)
 644 {
 645         if (!iface->ubus.name)
 646                 return;
 647
 648         ubus_remove_object(ctx, &iface->ubus);
 649         free((void *) iface->ubus.name);
 650 }