config.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 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18
  19 #include <uci.h>
  20
  21 #include "netifd.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "iprule.h"
  25 #include "proto.h"
  26 #include "wireless.h"
  27 #include "config.h"
  28
  29 bool config_init = false;
  30
  31 static struct uci_context *uci_ctx;
  32 static struct uci_package *uci_network;
  33 static struct uci_package *uci_wireless;
  34 static struct blob_buf b;
  35
  36 static int
  37 config_section_idx(struct uci_section *s)
  38 {
  39         struct uci_element *e;
  40         int idx = 0;
  41
  42         uci_foreach_element(&uci_wireless->sections, e) {
  43                 struct uci_section *cur = uci_to_section(e);
  44
  45                 if (s == cur)
  46                         return idx;
  47
  48                 if (!strcmp(cur->type, s->type))
  49                         idx++;
  50         }
  51
  52         return -1;
  53 }
  54
  55 static bool
  56 config_bridge_has_vlans(const char *br_name)
  57 {
  58         struct uci_element *e;
  59
  60         uci_foreach_element(&uci_network->sections, e) {
  61                 struct uci_section *s = uci_to_section(e);
  62                 const char *name;
  63
  64                 if (strcmp(s->type, "bridge-vlan") != 0)
  65                         continue;
  66
  67                 name = uci_lookup_option_string(uci_ctx, s, "device");
  68                 if (!name)
  69                         continue;
  70
  71                 if (!strcmp(name, br_name))
  72                         return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 static void
  79 config_fixup_bridge_var(struct uci_section *s, const char *name, const char *val)
  80 {
  81         struct uci_ptr ptr = {
  82                 .p = s->package,
  83                 .s = s,
  84                 .option = name,
  85                 .value = val,
  86         };
  87
  88         uci_lookup_ptr(uci_ctx, &ptr, NULL, false);
  89         if (ptr.o)
  90                 return;
  91
  92         uci_set(uci_ctx, &ptr);
  93 }
  94
  95 static void
  96 config_fixup_bridge_vlan_filtering(struct uci_section *s, const char *name)
  97 {
  98         bool has_vlans = config_bridge_has_vlans(name);
  99
 100         config_fixup_bridge_var(s, "__has_vlans", has_vlans ? "1" : "0");
 101
 102         if (!has_vlans)
 103                 return;
 104
 105         config_fixup_bridge_var(s, "vlan_filtering", "1");
 106 }
 107
 108 static int
 109 config_parse_bridge_interface(struct uci_section *s, struct device_type *devtype)
 110 {
 111         char *name;
 112
 113         name = alloca(strlen(s->e.name) + strlen(devtype->name_prefix) + 2);
 114         sprintf(name, "%s-%s", devtype->name_prefix, s->e.name);
 115         blobmsg_add_string(&b, "name", name);
 116
 117         config_fixup_bridge_vlan_filtering(s, name);
 118         uci_to_blob(&b, s, devtype->config_params);
 119         if (!device_create(name, devtype, b.head)) {
 120                 D(INTERFACE, "Failed to create '%s' device for interface '%s'\n",
 121                         devtype->name, s->e.name);
 122         }
 123
 124         blob_buf_init(&b, 0);
 125         blobmsg_add_string(&b, "ifname", name);
 126         return 0;
 127 }
 128
 129 static void
 130 config_parse_interface(struct uci_section *s, bool alias)
 131 {
 132         struct interface *iface;
 133         const char *type = NULL, *disabled;
 134         struct blob_attr *config;
 135         bool bridge = false;
 136         struct device_type *devtype = NULL;
 137
 138         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
 139         if (disabled && !strcmp(disabled, "1"))
 140                 return;
 141
 142         blob_buf_init(&b, 0);
 143
 144         if (!alias)
 145                 type = uci_lookup_option_string(uci_ctx, s, "type");
 146
 147         if (type)
 148                 devtype = device_type_get(type);
 149
 150         if (devtype && devtype->bridge_capability) {
 151                 if (config_parse_bridge_interface(s, devtype))
 152                         return;
 153
 154                 bridge = true;
 155         }
 156
 157         uci_to_blob(&b, s, &interface_attr_list);
 158
 159         iface = interface_alloc(s->e.name, b.head, false);
 160         if (!iface)
 161                 return;
 162
 163         if (iface->proto_handler && iface->proto_handler->config_params)
 164                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 165
 166         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 167                 iface->device_config = true;
 168
 169         config = blob_memdup(b.head);
 170         if (!config)
 171                 goto error;
 172
 173         if (alias) {
 174                 if (!interface_add_alias(iface, config))
 175                         goto error_free_config;
 176         } else {
 177                 if (!interface_add(iface, config))
 178                         goto error_free_config;
 179         }
 180         return;
 181
 182 error_free_config:
 183         free(config);
 184 error:
 185         free(iface);
 186 }
 187
 188 static void
 189 config_parse_route(struct uci_section *s, bool v6)
 190 {
 191         void *route;
 192
 193         blob_buf_init(&b, 0);
 194         route = blobmsg_open_array(&b, "route");
 195         uci_to_blob(&b, s, &route_attr_list);
 196         blobmsg_close_array(&b, route);
 197         interface_ip_add_route(NULL, blob_data(b.head), v6);
 198 }
 199
 200 static void
 201 config_parse_neighbor(struct uci_section *s, bool v6)
 202 {
 203         void *neighbor;
 204         blob_buf_init(&b,0);
 205         neighbor = blobmsg_open_array(&b, "neighbor");
 206         uci_to_blob(&b,s, &neighbor_attr_list);
 207         blobmsg_close_array(&b, neighbor);
 208         interface_ip_add_neighbor(NULL, blob_data(b.head), v6);
 209 }
 210
 211 static void
 212 config_parse_rule(struct uci_section *s, bool v6)
 213 {
 214         void *rule;
 215
 216         blob_buf_init(&b, 0);
 217         rule = blobmsg_open_array(&b, "rule");
 218         uci_to_blob(&b, s, &rule_attr_list);
 219         blobmsg_close_array(&b, rule);
 220         iprule_add(blob_data(b.head), v6);
 221 }
 222
 223 static void
 224 config_init_devices(void)
 225 {
 226         struct uci_element *e;
 227
 228         uci_foreach_element(&uci_network->sections, e) {
 229                 const struct uci_blob_param_list *params = NULL;
 230                 struct uci_section *s = uci_to_section(e);
 231                 struct device_type *devtype = NULL;
 232                 struct device *dev;
 233                 const char *type, *name;
 234
 235                 if (strcmp(s->type, "device") != 0)
 236                         continue;
 237
 238                 name = uci_lookup_option_string(uci_ctx, s, "name");
 239                 if (!name)
 240                         continue;
 241
 242                 type = uci_lookup_option_string(uci_ctx, s, "type");
 243                 if (type)
 244                         devtype = device_type_get(type);
 245
 246                 if (devtype)
 247                         params = devtype->config_params;
 248                 if (!params)
 249                         params = simple_device_type.config_params;
 250
 251                 if (devtype && devtype->bridge_capability)
 252                         config_fixup_bridge_vlan_filtering(s, name);
 253
 254                 blob_buf_init(&b, 0);
 255                 uci_to_blob(&b, s, params);
 256                 if (devtype) {
 257                         dev = device_create(name, devtype, b.head);
 258                         if (!dev)
 259                                 continue;
 260                 } else {
 261                         dev = device_get(name, 1);
 262                         if (!dev)
 263                                 continue;
 264
 265                         dev->current_config = true;
 266                         device_apply_config(dev, dev->type, b.head);
 267                 }
 268                 dev->default_config = false;
 269         }
 270 }
 271
 272 static void
 273 config_parse_vlan(struct device *dev, struct uci_section *s)
 274 {
 275         enum {
 276                 BRVLAN_ATTR_VID,
 277                 BRVLAN_ATTR_LOCAL,
 278                 BRVLAN_ATTR_PORTS,
 279                 __BRVLAN_ATTR_MAX,
 280         };
 281         static const struct blobmsg_policy vlan_attrs[__BRVLAN_ATTR_MAX] = {
 282                 [BRVLAN_ATTR_VID] = { "vlan", BLOBMSG_TYPE_INT32 },
 283                 [BRVLAN_ATTR_LOCAL] = { "local", BLOBMSG_TYPE_BOOL },
 284                 [BRVLAN_ATTR_PORTS] = { "ports", BLOBMSG_TYPE_ARRAY },
 285         };
 286         static const struct uci_blob_param_info vlan_attr_info[__BRVLAN_ATTR_MAX] = {
 287                 [BRVLAN_ATTR_PORTS] = { .type = BLOBMSG_TYPE_STRING },
 288         };
 289         static const struct uci_blob_param_list vlan_attr_list = {
 290                 .n_params = __BRVLAN_ATTR_MAX,
 291                 .params = vlan_attrs,
 292                 .info = vlan_attr_info,
 293         };
 294         struct blob_attr *tb[__BRVLAN_ATTR_MAX];
 295         struct blob_attr *cur;
 296         struct bridge_vlan_port *port;
 297         struct bridge_vlan *vlan;
 298         unsigned int vid;
 299         const char *val;
 300         char *name_buf;
 301         int name_len = 0;
 302         int n_ports = 0;
 303         int rem;
 304
 305         val = uci_lookup_option_string(uci_ctx, s, "vlan");
 306         if (!val)
 307                 return;
 308
 309         blob_buf_init(&b, 0);
 310         uci_to_blob(&b, s, &vlan_attr_list);
 311         blobmsg_parse(vlan_attrs, __BRVLAN_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 312
 313         if (!tb[BRVLAN_ATTR_VID])
 314                 return;
 315
 316         vid = blobmsg_get_u32(tb[BRVLAN_ATTR_VID]);
 317         if (!vid || vid > 4095)
 318                 return;
 319
 320         blobmsg_for_each_attr(cur, tb[BRVLAN_ATTR_PORTS], rem) {
 321                 name_len += strlen(blobmsg_get_string(cur)) + 1;
 322                 n_ports++;
 323         }
 324
 325         vlan = calloc(1, sizeof(*vlan) + n_ports * sizeof(*port) + name_len);
 326         if (!vlan)
 327                 return;
 328
 329         vlan->vid = vid;
 330         vlan->local = true;
 331         if (tb[BRVLAN_ATTR_LOCAL])
 332                 vlan->local = blobmsg_get_bool(tb[BRVLAN_ATTR_LOCAL]);
 333
 334         vlan->n_ports = n_ports;
 335         vlan->ports = port = (struct bridge_vlan_port *)&vlan[1];
 336         INIT_LIST_HEAD(&vlan->hotplug_ports);
 337         name_buf = (char *)&port[n_ports];
 338
 339         blobmsg_for_each_attr(cur, tb[BRVLAN_ATTR_PORTS], rem) {
 340                 char *sep;
 341
 342                 port->ifname = name_buf;
 343                 port->flags = BRVLAN_F_UNTAGGED;
 344                 strcpy(name_buf, blobmsg_get_string(cur));
 345
 346                 sep = strchr(name_buf, ':');
 347                 if (sep) {
 348                         for (*sep = 0, sep++; *sep; sep++)
 349                                 switch (*sep) {
 350                                 case '*':
 351                                         port->flags |= BRVLAN_F_PVID;
 352                                         break;
 353                                 case 't':
 354                                         port->flags &= ~BRVLAN_F_UNTAGGED;
 355                                         break;
 356                                 }
 357                 }
 358
 359                 name_buf += strlen(name_buf) + 1;
 360                 port++;
 361         }
 362
 363         vlist_add(&dev->vlans, &vlan->node, &vlan->vid);
 364 }
 365
 366
 367 static void
 368 config_init_vlans(void)
 369 {
 370         struct uci_element *e;
 371         struct device *dev;
 372
 373         device_vlan_update(false);
 374         uci_foreach_element(&uci_network->sections, e) {
 375                 struct uci_section *s = uci_to_section(e);
 376                 const char *name;
 377
 378                 if (strcmp(s->type, "bridge-vlan") != 0)
 379                         continue;
 380
 381                 name = uci_lookup_option_string(uci_ctx, s, "device");
 382                 if (!name)
 383                         continue;
 384
 385                 dev = device_get(name, 0);
 386                 if (!dev || !dev->vlans.update)
 387                         continue;
 388
 389                 config_parse_vlan(dev, s);
 390         }
 391         device_vlan_update(true);
 392 }
 393
 394 static struct uci_package *
 395 config_init_package(const char *config)
 396 {
 397         struct uci_context *ctx = uci_ctx;
 398         struct uci_package *p = NULL;
 399
 400         if (!ctx) {
 401                 ctx = uci_alloc_context();
 402                 uci_ctx = ctx;
 403
 404                 ctx->flags &= ~UCI_FLAG_STRICT;
 405                 if (config_path)
 406                         uci_set_confdir(ctx, config_path);
 407
 408 #ifdef DUMMY_MODE
 409                 uci_set_savedir(ctx, "./tmp");
 410 #endif
 411         } else {
 412                 p = uci_lookup_package(ctx, config);
 413                 if (p)
 414                         uci_unload(ctx, p);
 415         }
 416
 417         if (uci_load(ctx, config, &p))
 418                 return NULL;
 419
 420         return p;
 421 }
 422
 423 static void
 424 config_init_interfaces(void)
 425 {
 426         struct uci_element *e;
 427
 428         uci_foreach_element(&uci_network->sections, e) {
 429                 struct uci_section *s = uci_to_section(e);
 430
 431                 if (!strcmp(s->type, "interface"))
 432                         config_parse_interface(s, false);
 433         }
 434
 435         uci_foreach_element(&uci_network->sections, e) {
 436                 struct uci_section *s = uci_to_section(e);
 437
 438                 if (!strcmp(s->type, "alias"))
 439                         config_parse_interface(s, true);
 440         }
 441 }
 442
 443 static void
 444 config_init_ip(void)
 445 {
 446         struct interface *iface;
 447         struct uci_element *e;
 448
 449         vlist_for_each_element(&interfaces, iface, node)
 450                 interface_ip_update_start(&iface->config_ip);
 451
 452         uci_foreach_element(&uci_network->sections, e) {
 453                 struct uci_section *s = uci_to_section(e);
 454
 455                 if (!strcmp(s->type, "route"))
 456                         config_parse_route(s, false);
 457                 else if (!strcmp(s->type, "route6"))
 458                         config_parse_route(s, true);
 459                 if (!strcmp(s->type, "neighbor"))
 460                         config_parse_neighbor(s, false);
 461                 else if (!strcmp(s->type, "neighbor6"))
 462                         config_parse_neighbor(s, true);
 463         }
 464
 465         vlist_for_each_element(&interfaces, iface, node)
 466                 interface_ip_update_complete(&iface->config_ip);
 467 }
 468
 469 static void
 470 config_init_rules(void)
 471 {
 472         struct uci_element *e;
 473
 474         iprule_update_start();
 475
 476         uci_foreach_element(&uci_network->sections, e) {
 477                 struct uci_section *s = uci_to_section(e);
 478
 479                 if (!strcmp(s->type, "rule"))
 480                         config_parse_rule(s, false);
 481                 else if (!strcmp(s->type, "rule6"))
 482                         config_parse_rule(s, true);
 483         }
 484
 485         iprule_update_complete();
 486 }
 487
 488 static void
 489 config_init_globals(void)
 490 {
 491         struct uci_section *globals = uci_lookup_section(
 492                         uci_ctx, uci_network, "globals");
 493         if (!globals)
 494                 return;
 495
 496         const char *ula_prefix = uci_lookup_option_string(
 497                         uci_ctx, globals, "ula_prefix");
 498         interface_ip_set_ula_prefix(ula_prefix);
 499 }
 500
 501 static void
 502 config_parse_wireless_device(struct uci_section *s)
 503 {
 504         struct wireless_driver *drv;
 505         const char *driver_name;
 506
 507         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 508         if (!driver_name)
 509                 return;
 510
 511         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 512         if (!drv)
 513                 return;
 514
 515         blob_buf_init(&b, 0);
 516         uci_to_blob(&b, s, drv->device.config);
 517         wireless_device_create(drv, s->e.name, b.head);
 518 }
 519
 520 static struct wireless_interface*
 521 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 522 {
 523         char *name;
 524
 525         name = alloca(strlen(s->type) + 16);
 526         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 527
 528         blob_buf_init(&b, 0);
 529         uci_to_blob(&b, s, wdev->drv->interface.config);
 530         return wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 531 }
 532
 533 static void
 534 config_parse_wireless_vlan(struct wireless_device *wdev, char *vif, struct uci_section *s)
 535 {
 536         char *name;
 537
 538         name = alloca(strlen(s->type) + 16);
 539         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 540
 541         blob_buf_init(&b, 0);
 542         uci_to_blob(&b, s, wdev->drv->vlan.config);
 543         wireless_vlan_create(wdev, vif, b.head, s->anonymous ? name : s->e.name);
 544 }
 545
 546 static void
 547 config_parse_wireless_station(struct wireless_device *wdev, char *vif, struct uci_section *s)
 548 {
 549         char *name;
 550
 551         name = alloca(strlen(s->type) + 16);
 552         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 553
 554         blob_buf_init(&b, 0);
 555         uci_to_blob(&b, s, wdev->drv->station.config);
 556         wireless_station_create(wdev, vif, b.head, s->anonymous ? name : s->e.name);
 557 }
 558
 559 static void
 560 config_init_wireless(void)
 561 {
 562         struct wireless_device *wdev;
 563         struct uci_element *e;
 564         const char *dev_name;
 565
 566         if (!uci_wireless) {
 567                 DPRINTF("No wireless configuration found\n");
 568                 return;
 569         }
 570
 571         vlist_update(&wireless_devices);
 572
 573         uci_foreach_element(&uci_wireless->sections, e) {
 574                 struct uci_section *s = uci_to_section(e);
 575                 if (strcmp(s->type, "wifi-device") != 0)
 576                         continue;
 577
 578                 config_parse_wireless_device(s);
 579         }
 580
 581         vlist_flush(&wireless_devices);
 582
 583         vlist_for_each_element(&wireless_devices, wdev, node) {
 584                 wdev->vif_idx = 0;
 585                 vlist_update(&wdev->interfaces);
 586                 wdev->vlan_idx = 0;
 587                 vlist_update(&wdev->vlans);
 588                 wdev->sta_idx = 0;
 589                 vlist_update(&wdev->stations);
 590         }
 591
 592         uci_foreach_element(&uci_wireless->sections, e) {
 593                 struct uci_section *s = uci_to_section(e);
 594                 struct wireless_interface *vif;
 595                 struct uci_element *f;
 596
 597                 if (strcmp(s->type, "wifi-iface") != 0)
 598                         continue;
 599
 600                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 601                 if (!dev_name)
 602                         continue;
 603
 604                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 605                 if (!wdev) {
 606                         DPRINTF("device %s not found!\n", dev_name);
 607                         continue;
 608                 }
 609
 610                 vif = config_parse_wireless_interface(wdev, s);
 611
 612                 if (!vif || s->anonymous)
 613                         continue;
 614                 uci_foreach_element(&uci_wireless->sections, f) {
 615                         struct uci_section *s = uci_to_section(f);
 616                         const char *vif_name;
 617
 618                         if (strcmp(s->type, "wifi-vlan") != 0)
 619                                 continue;
 620
 621                         vif_name = uci_lookup_option_string(uci_ctx, s, "iface");
 622                         if (vif_name && strcmp(e->name, vif_name))
 623                                 continue;
 624                         config_parse_wireless_vlan(wdev, vif->name, s);
 625                 }
 626
 627                 uci_foreach_element(&uci_wireless->sections, f) {
 628                         struct uci_section *s = uci_to_section(f);
 629                         const char *vif_name;
 630
 631                         if (strcmp(s->type, "wifi-station") != 0)
 632                                 continue;
 633
 634                         vif_name = uci_lookup_option_string(uci_ctx, s, "iface");
 635                         if (vif_name && strcmp(e->name, vif_name))
 636                                 continue;
 637                         config_parse_wireless_station(wdev, vif->name, s);
 638                 }
 639         }
 640
 641         vlist_for_each_element(&wireless_devices, wdev, node) {
 642                 vlist_flush(&wdev->interfaces);
 643                 vlist_flush(&wdev->vlans);
 644                 vlist_flush(&wdev->stations);
 645         }
 646 }
 647
 648 int
 649 config_init_all(void)
 650 {
 651         int ret = 0;
 652         char *err;
 653
 654         uci_network = config_init_package("network");
 655         if (!uci_network) {
 656                 uci_get_errorstr(uci_ctx, &err, NULL);
 657                 netifd_log_message(L_CRIT, "Failed to load network config (%s)\n", err);
 658                 free(err);
 659                 return -1;
 660         }
 661
 662         uci_wireless = config_init_package("wireless");
 663         if (!uci_wireless && uci_ctx->err != UCI_ERR_NOTFOUND) {
 664                 uci_get_errorstr(uci_ctx, &err, NULL);
 665                 netifd_log_message(L_CRIT, "Failed to load wireless config (%s)\n", err);
 666                 free(err);
 667                 ret = -1;
 668         }
 669
 670         vlist_update(&interfaces);
 671         config_init = true;
 672         device_lock();
 673
 674         device_reset_config();
 675         config_init_devices();
 676         config_init_interfaces();
 677         config_init_vlans();
 678         config_init_ip();
 679         config_init_rules();
 680         config_init_globals();
 681         config_init_wireless();
 682
 683         config_init = false;
 684         device_unlock();
 685
 686         device_reset_old();
 687         device_init_pending();
 688         vlist_flush(&interfaces);
 689         device_free_unused(NULL);
 690         interface_refresh_assignments(false);
 691         interface_start_pending();
 692         wireless_start_pending();
 693
 694         return ret;
 695 }