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 int
  96 netifd_get_proto_handlers(struct ubus_context *ctx, struct ubus_object *obj,
  97                           struct ubus_request_data *req, const char *method,
  98                           struct blob_attr *msg)
  99 {
 100         blob_buf_init(&b, 0);
 101         proto_dump_handlers(&b);
 102         ubus_send_reply(ctx, req, b.head);
 103
 104         return 0;
 105 }
 106
 107 static struct ubus_method main_object_methods[] = {
 108         { .name = "restart", .handler = netifd_handle_restart },
 109         { .name = "reload", .handler = netifd_handle_reload },
 110         UBUS_METHOD("add_host_route", netifd_add_host_route, route_policy),
 111         { .name = "get_proto_handlers", .handler = netifd_get_proto_handlers },
 112 };
 113
 114 static struct ubus_object_type main_object_type =
 115         UBUS_OBJECT_TYPE("netifd", main_object_methods);
 116
 117 static struct ubus_object main_object = {
 118         .name = "network",
 119         .type = &main_object_type,
 120         .methods = main_object_methods,
 121         .n_methods = ARRAY_SIZE(main_object_methods),
 122 };
 123
 124 enum {
 125         DEV_NAME,
 126         __DEV_MAX,
 127 };
 128
 129 static const struct blobmsg_policy dev_policy[__DEV_MAX] = {
 130         [DEV_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 131 };
 132
 133 static int
 134 netifd_dev_status(struct ubus_context *ctx, struct ubus_object *obj,
 135                   struct ubus_request_data *req, const char *method,
 136                   struct blob_attr *msg)
 137 {
 138         struct device *dev = NULL;
 139         struct blob_attr *tb[__DEV_MAX];
 140
 141         blobmsg_parse(dev_policy, __DEV_MAX, tb, blob_data(msg), blob_len(msg));
 142
 143         if (tb[DEV_NAME]) {
 144                 dev = device_get(blobmsg_data(tb[DEV_NAME]), false);
 145                 if (!dev)
 146                         return UBUS_STATUS_INVALID_ARGUMENT;
 147         }
 148
 149         blob_buf_init(&b, 0);
 150         device_dump_status(&b, dev);
 151         ubus_send_reply(ctx, req, b.head);
 152
 153         return 0;
 154 }
 155
 156 enum {
 157         ALIAS_ATTR_ALIAS,
 158         ALIAS_ATTR_DEV,
 159         __ALIAS_ATTR_MAX,
 160 };
 161
 162 static const struct blobmsg_policy alias_attrs[__ALIAS_ATTR_MAX] = {
 163         [ALIAS_ATTR_ALIAS] = { "alias", BLOBMSG_TYPE_ARRAY },
 164         [ALIAS_ATTR_DEV] = { "device", BLOBMSG_TYPE_STRING },
 165 };
 166
 167 static int
 168 netifd_handle_alias(struct ubus_context *ctx, struct ubus_object *obj,
 169                     struct ubus_request_data *req, const char *method,
 170                     struct blob_attr *msg)
 171 {
 172         struct device *dev = NULL;
 173         struct blob_attr *tb[__ALIAS_ATTR_MAX];
 174         struct blob_attr *cur;
 175         int rem;
 176
 177         blobmsg_parse(alias_attrs, __ALIAS_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
 178
 179         if (!tb[ALIAS_ATTR_ALIAS])
 180                 return UBUS_STATUS_INVALID_ARGUMENT;
 181
 182         if ((cur = tb[ALIAS_ATTR_DEV]) != NULL) {
 183                 dev = device_get(blobmsg_data(cur), true);
 184                 if (!dev)
 185                         return UBUS_STATUS_NOT_FOUND;
 186         }
 187
 188         blobmsg_for_each_attr(cur, tb[ALIAS_ATTR_ALIAS], rem) {
 189                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 190                         goto error;
 191
 192                 if (!blobmsg_check_attr(cur, NULL))
 193                         goto error;
 194
 195                 alias_notify_device(blobmsg_data(cur), dev);
 196         }
 197         return 0;
 198
 199 error:
 200         device_free_unused(dev);
 201         return UBUS_STATUS_INVALID_ARGUMENT;
 202 }
 203
 204 static struct ubus_method dev_object_methods[] = {
 205         UBUS_METHOD("status", netifd_dev_status, dev_policy),
 206         UBUS_METHOD("set_alias", netifd_handle_alias, alias_attrs),
 207 };
 208
 209 static struct ubus_object_type dev_object_type =
 210         UBUS_OBJECT_TYPE("device", dev_object_methods);
 211
 212 static struct ubus_object dev_object = {
 213         .name = "network.device",
 214         .type = &dev_object_type,
 215         .methods = dev_object_methods,
 216         .n_methods = ARRAY_SIZE(dev_object_methods),
 217 };
 218
 219 static void
 220 netifd_ubus_add_fd(void)
 221 {
 222         ubus_add_uloop(ctx);
 223         ubus_fd.fd = ctx->sock.fd;
 224         netifd_fd_add(&ubus_fd);
 225 }
 226
 227 static void
 228 netifd_ubus_reconnect_timer(struct uloop_timeout *timeout)
 229 {
 230         static struct uloop_timeout retry = {
 231                 .cb = netifd_ubus_reconnect_timer,
 232         };
 233         int t = 2;
 234
 235         if (ubus_reconnect(ctx, ubus_path) != 0) {
 236                 DPRINTF("failed to reconnect, trying again in %d seconds\n", t);
 237                 uloop_timeout_set(&retry, t * 1000);
 238                 return;
 239         }
 240
 241         DPRINTF("reconnected to ubus, new id: %08x\n", ctx->local_id);
 242         netifd_ubus_add_fd();
 243 }
 244
 245 static void
 246 netifd_ubus_connection_lost(struct ubus_context *ctx)
 247 {
 248         netifd_fd_delete(&ubus_fd);
 249         netifd_ubus_reconnect_timer(NULL);
 250 }
 251
 252 int
 253 netifd_ubus_init(const char *path)
 254 {
 255         int ret;
 256
 257         uloop_init();
 258         ubus_path = path;
 259
 260         ctx = ubus_connect(path);
 261         if (!ctx)
 262                 return -EIO;
 263
 264         DPRINTF("connected as %08x\n", ctx->local_id);
 265         ctx->connection_lost = netifd_ubus_connection_lost;
 266         netifd_ubus_add_fd();
 267
 268         ret = ubus_add_object(ctx, &main_object);
 269         if (ret)
 270                 goto out;
 271
 272         ret = ubus_add_object(ctx, &dev_object);
 273
 274 out:
 275         if (ret != 0)
 276                 fprintf(stderr, "Failed to publish object: %s\n", ubus_strerror(ret));
 277         return ret;
 278 }
 279
 280 void
 281 netifd_ubus_done(void)
 282 {
 283         ubus_free(ctx);
 284 }
 285
 286
 287 /* per-interface object */
 288
 289 static int
 290 netifd_handle_up(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_up(iface);
 298
 299         return 0;
 300 }
 301
 302 static int
 303 netifd_handle_down(struct ubus_context *ctx, struct ubus_object *obj,
 304                    struct ubus_request_data *req, const char *method,
 305                    struct blob_attr *msg)
 306 {
 307         struct interface *iface;
 308
 309         iface = container_of(obj, struct interface, ubus);
 310         interface_set_down(iface);
 311
 312         return 0;
 313 }
 314
 315 static void
 316 netifd_add_interface_errors(struct blob_buf *b, struct interface *iface)
 317 {
 318         struct interface_error *error;
 319         void *e, *e2, *e3;
 320         int i;
 321
 322         e = blobmsg_open_array(b, "errors");
 323         list_for_each_entry(error, &iface->errors, list) {
 324                 e2 = blobmsg_open_table(b, NULL);
 325
 326                 blobmsg_add_string(b, "subsystem", error->subsystem);
 327                 blobmsg_add_string(b, "code", error->code);
 328                 if (error->data[0]) {
 329                         e3 = blobmsg_open_array(b, "data");
 330                         for (i = 0; error->data[i]; i++)
 331                                 blobmsg_add_string(b, NULL, error->data[i]);
 332                         blobmsg_close_array(b, e3);
 333                 }
 334
 335                 blobmsg_close_table(b, e2);
 336         }
 337         blobmsg_close_array(b, e);
 338 }
 339
 340 static void
 341 interface_ip_dump_address_list(struct interface_ip_settings *ip, bool v6)
 342 {
 343         struct device_addr *addr;
 344         char *buf;
 345         void *a;
 346         int buflen = 128;
 347         int af;
 348
 349         vlist_for_each_element(&ip->addr, addr, node) {
 350                 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4)
 351                         af = AF_INET;
 352                 else
 353                         af = AF_INET6;
 354
 355                 if (af != (v6 ? AF_INET6 : AF_INET))
 356                         continue;
 357
 358                 a = blobmsg_open_table(&b, NULL);
 359
 360                 buf = blobmsg_alloc_string_buffer(&b, "address", buflen);
 361                 inet_ntop(af, &addr->addr, buf, buflen);
 362                 blobmsg_add_string_buffer(&b);
 363
 364                 blobmsg_add_u32(&b, "mask", addr->mask);
 365
 366                 blobmsg_close_table(&b, a);
 367         }
 368 }
 369
 370 static void
 371 interface_ip_dump_route_list(struct interface_ip_settings *ip)
 372 {
 373         struct device_route *route;
 374         int buflen = 128;
 375         char *buf;
 376         void *r;
 377         int af;
 378
 379         vlist_for_each_element(&ip->route, route, node) {
 380                 if ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4)
 381                         af = AF_INET;
 382                 else
 383                         af = AF_INET6;
 384
 385                 r = blobmsg_open_table(&b, NULL);
 386
 387                 buf = blobmsg_alloc_string_buffer(&b, "target", buflen);
 388                 inet_ntop(af, &route->addr, buf, buflen);
 389                 blobmsg_add_string_buffer(&b);
 390
 391                 blobmsg_add_u32(&b, "mask", route->mask);
 392
 393                 buf = blobmsg_alloc_string_buffer(&b, "nexthop", buflen);
 394                 inet_ntop(af, &route->nexthop, buf, buflen);
 395                 blobmsg_add_string_buffer(&b);
 396
 397                 blobmsg_close_table(&b, r);
 398         }
 399 }
 400
 401 static void
 402 interface_ip_dump_dns_server_list(struct interface_ip_settings *ip)
 403 {
 404         struct dns_server *dns;
 405         int buflen = 128;
 406         char *buf;
 407
 408         vlist_simple_for_each_element(&ip->dns_servers, dns, node) {
 409                 buf = blobmsg_alloc_string_buffer(&b, NULL, buflen);
 410                 inet_ntop(dns->af, &dns->addr, buf, buflen);
 411                 blobmsg_add_string_buffer(&b);
 412         }
 413 }
 414
 415 static void
 416 interface_ip_dump_dns_search_list(struct interface_ip_settings *ip)
 417 {
 418         struct dns_search_domain *dns;
 419
 420         vlist_simple_for_each_element(&ip->dns_search, dns, node) {
 421                 blobmsg_add_string(&b, NULL, dns->name);
 422         }
 423 }
 424
 425 static int
 426 netifd_handle_status(struct ubus_context *ctx, struct ubus_object *obj,
 427                      struct ubus_request_data *req, const char *method,
 428                      struct blob_attr *msg)
 429 {
 430         struct interface *iface;
 431         struct interface_data *data;
 432         struct device *dev;
 433         void *a;
 434
 435         iface = container_of(obj, struct interface, ubus);
 436
 437         blob_buf_init(&b, 0);
 438         blobmsg_add_u8(&b, "up", iface->state == IFS_UP);
 439         blobmsg_add_u8(&b, "pending", iface->state == IFS_SETUP);
 440         blobmsg_add_u8(&b, "available", iface->available);
 441         blobmsg_add_u8(&b, "autostart", iface->autostart);
 442
 443         if (iface->state == IFS_UP) {
 444                 time_t cur = system_get_rtime();
 445                 blobmsg_add_u32(&b, "uptime", cur - iface->start_time);
 446                 blobmsg_add_string(&b, "l3_device", iface->l3_dev.dev->ifname);
 447         }
 448
 449         if (iface->proto_handler)
 450                 blobmsg_add_string(&b, "proto", iface->proto_handler->name);
 451
 452         dev = iface->main_dev.dev;
 453         if (dev && !(iface->proto_handler->flags & PROTO_FLAG_NODEV))
 454                 blobmsg_add_string(&b, "device", dev->ifname);
 455
 456         if (iface->state == IFS_UP) {
 457                 a = blobmsg_open_array(&b, "ipv4-address");
 458                 interface_ip_dump_address_list(&iface->config_ip, false);
 459                 interface_ip_dump_address_list(&iface->proto_ip, false);
 460                 blobmsg_close_array(&b, a);
 461                 a = blobmsg_open_array(&b, "ipv6-address");
 462                 interface_ip_dump_address_list(&iface->config_ip, true);
 463                 interface_ip_dump_address_list(&iface->proto_ip, true);
 464                 blobmsg_close_array(&b, a);
 465                 a = blobmsg_open_array(&b, "route");
 466                 interface_ip_dump_route_list(&iface->config_ip);
 467                 interface_ip_dump_route_list(&iface->proto_ip);
 468                 blobmsg_close_array(&b, a);
 469                 a = blobmsg_open_array(&b, "dns-server");
 470                 interface_ip_dump_dns_server_list(&iface->config_ip);
 471                 interface_ip_dump_dns_server_list(&iface->proto_ip);
 472                 blobmsg_close_array(&b, a);
 473                 a = blobmsg_open_array(&b, "dns-search");
 474                 interface_ip_dump_dns_search_list(&iface->config_ip);
 475                 interface_ip_dump_dns_search_list(&iface->proto_ip);
 476                 blobmsg_close_array(&b, a);
 477         }
 478
 479         a = blobmsg_open_table(&b, "data");
 480         avl_for_each_element(&iface->data, data, node)
 481                 blob_put(&b, blob_id(data->data), blob_data(data->data), blob_len(data->data));
 482
 483         blobmsg_close_table(&b, a);
 484
 485         if (!list_is_empty(&iface->errors))
 486                 netifd_add_interface_errors(&b, iface);
 487
 488         ubus_send_reply(ctx, req, b.head);
 489
 490         return 0;
 491 }
 492
 493 static int
 494 netifd_iface_handle_device(struct ubus_context *ctx, struct ubus_object *obj,
 495                            struct ubus_request_data *req, const char *method,
 496                            struct blob_attr *msg)
 497 {
 498         struct blob_attr *tb[__DEV_MAX];
 499         struct interface *iface;
 500         struct device *dev;
 501         bool add = !strncmp(method, "add", 3);
 502         int ret;
 503
 504         iface = container_of(obj, struct interface, ubus);
 505
 506         blobmsg_parse(dev_policy, __DEV_MAX, tb, blob_data(msg), blob_len(msg));
 507
 508         if (!tb[DEV_NAME])
 509                 return UBUS_STATUS_INVALID_ARGUMENT;
 510
 511         device_lock();
 512
 513         dev = device_get(blobmsg_data(tb[DEV_NAME]), add ? 2 : 0);
 514         if (add && !dev)
 515                 return UBUS_STATUS_NOT_FOUND;
 516
 517         if (add)
 518                 return interface_add_link(iface, dev);
 519         else
 520                 return interface_remove_link(iface, dev);
 521
 522         device_unlock();
 523
 524         return ret;
 525 }
 526
 527
 528 static int
 529 netifd_iface_notify_proto(struct ubus_context *ctx, struct ubus_object *obj,
 530                           struct ubus_request_data *req, const char *method,
 531                           struct blob_attr *msg)
 532 {
 533         struct interface *iface;
 534
 535         iface = container_of(obj, struct interface, ubus);
 536
 537         if (!iface->proto || !iface->proto->notify)
 538                 return UBUS_STATUS_NOT_SUPPORTED;
 539
 540         return iface->proto->notify(iface->proto, msg);
 541 }
 542
 543 static void
 544 netifd_iface_do_remove(struct uloop_timeout *timeout)
 545 {
 546         struct interface *iface;
 547
 548         iface = container_of(timeout, struct interface, remove_timer);
 549         vlist_delete(&interfaces, &iface->node);
 550 }
 551
 552 static int
 553 netifd_iface_remove(struct ubus_context *ctx, struct ubus_object *obj,
 554                     struct ubus_request_data *req, const char *method,
 555                     struct blob_attr *msg)
 556 {
 557         struct interface *iface;
 558
 559         iface = container_of(obj, struct interface, ubus);
 560         if (iface->remove_timer.cb)
 561                 return UBUS_STATUS_INVALID_ARGUMENT;
 562
 563         iface->remove_timer.cb = netifd_iface_do_remove;
 564         uloop_timeout_set(&iface->remove_timer, 100);
 565         return 0;
 566 }
 567
 568 static int
 569 netifd_handle_iface_prepare(struct ubus_context *ctx, struct ubus_object *obj,
 570                             struct ubus_request_data *req, const char *method,
 571                             struct blob_attr *msg)
 572 {
 573         struct interface *iface;
 574         struct device *dev;
 575         const struct device_hotplug_ops *ops;
 576
 577         iface = container_of(obj, struct interface, ubus);
 578         dev = iface->main_dev.dev;
 579         if (!dev)
 580                 return 0;
 581
 582         ops = dev->hotplug_ops;
 583         if (!ops)
 584                 return 0;
 585
 586         return ops->prepare(dev);
 587 }
 588
 589 static int
 590 netifd_handle_set_data(struct ubus_context *ctx, struct ubus_object *obj,
 591                        struct ubus_request_data *req, const char *method,
 592                        struct blob_attr *msg)
 593 {
 594         struct interface *iface;
 595         struct blob_attr *cur;
 596         int rem, ret;
 597
 598         iface = container_of(obj, struct interface, ubus);
 599
 600         blob_for_each_attr(cur, msg, rem) {
 601                 ret = interface_add_data(iface, cur);
 602                 if (ret)
 603                         return ret;
 604         }
 605
 606         return 0;
 607 }
 608
 609 static struct ubus_method iface_object_methods[] = {
 610         { .name = "up", .handler = netifd_handle_up },
 611         { .name = "down", .handler = netifd_handle_down },
 612         { .name = "status", .handler = netifd_handle_status },
 613         { .name = "prepare", .handler = netifd_handle_iface_prepare },
 614         UBUS_METHOD("add_device", netifd_iface_handle_device, dev_policy ),
 615         UBUS_METHOD("remove_device", netifd_iface_handle_device, dev_policy ),
 616         { .name = "notify_proto", .handler = netifd_iface_notify_proto },
 617         { .name = "remove", .handler = netifd_iface_remove },
 618         { .name = "set_data", .handler = netifd_handle_set_data },
 619 };
 620
 621 static struct ubus_object_type iface_object_type =
 622         UBUS_OBJECT_TYPE("netifd_iface", iface_object_methods);
 623
 624
 625 void
 626 netifd_ubus_interface_event(struct interface *iface, bool up)
 627 {
 628         blob_buf_init(&b, 0);
 629         blobmsg_add_string(&b, "action", up ? "ifup" : "ifdown");
 630         blobmsg_add_string(&b, "interface", iface->name);
 631         ubus_send_event(ctx, "network.interface", b.head);
 632 }
 633
 634 void
 635 netifd_ubus_add_interface(struct interface *iface)
 636 {
 637         struct ubus_object *obj = &iface->ubus;
 638         char *name = NULL;
 639
 640         asprintf(&name, "%s.interface.%s", main_object.name, iface->name);
 641         if (!name)
 642                 return;
 643
 644         obj->name = name;
 645         obj->type = &iface_object_type;
 646         obj->methods = iface_object_methods;
 647         obj->n_methods = ARRAY_SIZE(iface_object_methods);
 648         if (ubus_add_object(ctx, &iface->ubus)) {
 649                 DPRINTF("failed to publish ubus object for interface '%s'\n", iface->name);
 650                 free(name);
 651                 obj->name = NULL;
 652         }
 653 }
 654
 655 void
 656 netifd_ubus_remove_interface(struct interface *iface)
 657 {
 658         if (!iface->ubus.name)
 659                 return;
 660
 661         ubus_remove_object(ctx, &iface->ubus);
 662         free((void *) iface->ubus.name);
 663 }