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 int
  56 config_parse_bridge_interface(struct uci_section *s, struct device_type *devtype)
  57 {
  58         char *name;
  59
  60         name = alloca(strlen(s->e.name) + strlen(devtype->name_prefix) + 2);
  61         sprintf(name, "%s-%s", devtype->name_prefix, s->e.name);
  62         blobmsg_add_string(&b, "name", name);
  63
  64         uci_to_blob(&b, s, devtype->config_params);
  65         if (!device_create(name, devtype, b.head)) {
  66                 D(INTERFACE, "Failed to create '%s' device for interface '%s'\n",
  67                         devtype->name, s->e.name);
  68         }
  69
  70         blob_buf_init(&b, 0);
  71         blobmsg_add_string(&b, "ifname", name);
  72         return 0;
  73 }
  74
  75 static void
  76 config_parse_interface(struct uci_section *s, bool alias)
  77 {
  78         struct interface *iface;
  79         const char *type = NULL, *disabled;
  80         struct blob_attr *config;
  81         bool bridge = false;
  82         struct device_type *devtype = NULL;
  83
  84         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
  85         if (disabled && !strcmp(disabled, "1"))
  86                 return;
  87
  88         blob_buf_init(&b, 0);
  89
  90         if (!alias)
  91                 type = uci_lookup_option_string(uci_ctx, s, "type");
  92
  93         if (type)
  94                 devtype = device_type_get(type);
  95
  96         if (devtype && devtype->bridge_capability) {
  97                 if (config_parse_bridge_interface(s, devtype))
  98                         return;
  99
 100                 bridge = true;
 101         }
 102
 103         uci_to_blob(&b, s, &interface_attr_list);
 104
 105         iface = interface_alloc(s->e.name, b.head, false);
 106         if (!iface)
 107                 return;
 108
 109         if (iface->proto_handler && iface->proto_handler->config_params)
 110                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 111
 112         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 113                 iface->device_config = true;
 114
 115         config = blob_memdup(b.head);
 116         if (!config)
 117                 goto error;
 118
 119         if (alias) {
 120                 if (!interface_add_alias(iface, config))
 121                         goto error_free_config;
 122         } else {
 123                 if (!interface_add(iface, config))
 124                         goto error_free_config;
 125         }
 126         return;
 127
 128 error_free_config:
 129         free(config);
 130 error:
 131         free(iface);
 132 }
 133
 134 static void
 135 config_parse_route(struct uci_section *s, bool v6)
 136 {
 137         void *route;
 138
 139         blob_buf_init(&b, 0);
 140         route = blobmsg_open_array(&b, "route");
 141         uci_to_blob(&b, s, &route_attr_list);
 142         blobmsg_close_array(&b, route);
 143         interface_ip_add_route(NULL, blob_data(b.head), v6);
 144 }
 145
 146 static void
 147 config_parse_rule(struct uci_section *s, bool v6)
 148 {
 149         void *rule;
 150
 151         blob_buf_init(&b, 0);
 152         rule = blobmsg_open_array(&b, "rule");
 153         uci_to_blob(&b, s, &rule_attr_list);
 154         blobmsg_close_array(&b, rule);
 155         iprule_add(blob_data(b.head), v6);
 156 }
 157
 158 static void
 159 config_init_devices(void)
 160 {
 161         struct uci_element *e;
 162
 163         uci_foreach_element(&uci_network->sections, e) {
 164                 const struct uci_blob_param_list *params = NULL;
 165                 struct uci_section *s = uci_to_section(e);
 166                 struct device_type *devtype = NULL;
 167                 struct device *dev;
 168                 const char *type, *name;
 169
 170                 if (strcmp(s->type, "device") != 0)
 171                         continue;
 172
 173                 name = uci_lookup_option_string(uci_ctx, s, "name");
 174                 if (!name)
 175                         continue;
 176
 177                 type = uci_lookup_option_string(uci_ctx, s, "type");
 178                 if (type)
 179                         devtype = device_type_get(type);
 180
 181                 if (devtype)
 182                         params = devtype->config_params;
 183                 if (!params)
 184                         params = simple_device_type.config_params;
 185
 186                 blob_buf_init(&b, 0);
 187                 uci_to_blob(&b, s, params);
 188                 if (devtype) {
 189                         dev = device_create(name, devtype, b.head);
 190                         if (!dev)
 191                                 continue;
 192                 } else {
 193                         dev = device_get(name, 1);
 194                         if (!dev)
 195                                 continue;
 196
 197                         dev->current_config = true;
 198                         device_apply_config(dev, dev->type, b.head);
 199                 }
 200                 dev->default_config = false;
 201         }
 202 }
 203
 204 static struct uci_package *
 205 config_init_package(const char *config)
 206 {
 207         struct uci_context *ctx = uci_ctx;
 208         struct uci_package *p = NULL;
 209
 210         if (!ctx) {
 211                 ctx = uci_alloc_context();
 212                 uci_ctx = ctx;
 213
 214                 ctx->flags &= ~UCI_FLAG_STRICT;
 215                 if (config_path)
 216                         uci_set_confdir(ctx, config_path);
 217
 218 #ifdef DUMMY_MODE
 219                 uci_set_savedir(ctx, "./tmp");
 220 #endif
 221         } else {
 222                 p = uci_lookup_package(ctx, config);
 223                 if (p)
 224                         uci_unload(ctx, p);
 225         }
 226
 227         if (uci_load(ctx, config, &p))
 228                 return NULL;
 229
 230         return p;
 231 }
 232
 233 static void
 234 config_init_interfaces(void)
 235 {
 236         struct uci_element *e;
 237
 238         uci_foreach_element(&uci_network->sections, e) {
 239                 struct uci_section *s = uci_to_section(e);
 240
 241                 if (!strcmp(s->type, "interface"))
 242                         config_parse_interface(s, false);
 243         }
 244
 245         uci_foreach_element(&uci_network->sections, e) {
 246                 struct uci_section *s = uci_to_section(e);
 247
 248                 if (!strcmp(s->type, "alias"))
 249                         config_parse_interface(s, true);
 250         }
 251 }
 252
 253 static void
 254 config_init_routes(void)
 255 {
 256         struct interface *iface;
 257         struct uci_element *e;
 258
 259         vlist_for_each_element(&interfaces, iface, node)
 260                 interface_ip_update_start(&iface->config_ip);
 261
 262         uci_foreach_element(&uci_network->sections, e) {
 263                 struct uci_section *s = uci_to_section(e);
 264
 265                 if (!strcmp(s->type, "route"))
 266                         config_parse_route(s, false);
 267                 else if (!strcmp(s->type, "route6"))
 268                         config_parse_route(s, true);
 269         }
 270
 271         vlist_for_each_element(&interfaces, iface, node)
 272                 interface_ip_update_complete(&iface->config_ip);
 273 }
 274
 275 static void
 276 config_init_rules(void)
 277 {
 278         struct uci_element *e;
 279
 280         iprule_update_start();
 281
 282         uci_foreach_element(&uci_network->sections, e) {
 283                 struct uci_section *s = uci_to_section(e);
 284
 285                 if (!strcmp(s->type, "rule"))
 286                         config_parse_rule(s, false);
 287                 else if (!strcmp(s->type, "rule6"))
 288                         config_parse_rule(s, true);
 289         }
 290
 291         iprule_update_complete();
 292 }
 293
 294 static void
 295 config_init_globals(void)
 296 {
 297         struct uci_section *globals = uci_lookup_section(
 298                         uci_ctx, uci_network, "globals");
 299         if (!globals)
 300                 return;
 301
 302         const char *ula_prefix = uci_lookup_option_string(
 303                         uci_ctx, globals, "ula_prefix");
 304         interface_ip_set_ula_prefix(ula_prefix);
 305 }
 306
 307 static void
 308 config_parse_wireless_device(struct uci_section *s)
 309 {
 310         struct wireless_driver *drv;
 311         const char *driver_name;
 312
 313         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 314         if (!driver_name)
 315                 return;
 316
 317         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 318         if (!drv)
 319                 return;
 320
 321         blob_buf_init(&b, 0);
 322         uci_to_blob(&b, s, drv->device.config);
 323         wireless_device_create(drv, s->e.name, b.head);
 324 }
 325
 326 static void
 327 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 328 {
 329         char *name;
 330
 331         name = alloca(strlen(s->type) + 16);
 332         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 333
 334         blob_buf_init(&b, 0);
 335         uci_to_blob(&b, s, wdev->drv->interface.config);
 336         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 337 }
 338
 339 static void
 340 config_init_wireless(void)
 341 {
 342         struct wireless_device *wdev;
 343         struct uci_element *e;
 344         const char *dev_name;
 345
 346         if (!uci_wireless) {
 347                 DPRINTF("No wireless configuration found\n");
 348                 return;
 349         }
 350
 351         vlist_update(&wireless_devices);
 352
 353         uci_foreach_element(&uci_wireless->sections, e) {
 354                 struct uci_section *s = uci_to_section(e);
 355                 if (strcmp(s->type, "wifi-device") != 0)
 356                         continue;
 357
 358                 config_parse_wireless_device(s);
 359         }
 360
 361         vlist_flush(&wireless_devices);
 362
 363         vlist_for_each_element(&wireless_devices, wdev, node) {
 364                 wdev->vif_idx = 0;
 365                 vlist_update(&wdev->interfaces);
 366         }
 367
 368         uci_foreach_element(&uci_wireless->sections, e) {
 369                 struct uci_section *s = uci_to_section(e);
 370
 371                 if (strcmp(s->type, "wifi-iface") != 0)
 372                         continue;
 373
 374                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 375                 if (!dev_name)
 376                         continue;
 377
 378                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 379                 if (!wdev) {
 380                         DPRINTF("device %s not found!\n", dev_name);
 381                         continue;
 382                 }
 383
 384                 config_parse_wireless_interface(wdev, s);
 385         }
 386
 387         vlist_for_each_element(&wireless_devices, wdev, node)
 388                 vlist_flush(&wdev->interfaces);
 389 }
 390
 391 int
 392 config_init_all(void)
 393 {
 394         int ret = 0;
 395         char *err;
 396
 397         uci_network = config_init_package("network");
 398         if (!uci_network) {
 399                 uci_get_errorstr(uci_ctx, &err, NULL);
 400                 netifd_log_message(L_CRIT, "Failed to load network config (%s)\n", err);
 401                 free(err);
 402                 return -1;
 403         }
 404
 405         uci_wireless = config_init_package("wireless");
 406         if (!uci_wireless && uci_ctx->err != UCI_ERR_NOTFOUND) {
 407                 uci_get_errorstr(uci_ctx, &err, NULL);
 408                 netifd_log_message(L_CRIT, "Failed to load wireless config (%s)\n", err);
 409                 free(err);
 410                 ret = -1;
 411         }
 412
 413         vlist_update(&interfaces);
 414         config_init = true;
 415         device_lock();
 416
 417         device_reset_config();
 418         config_init_devices();
 419         config_init_interfaces();
 420         config_init_routes();
 421         config_init_rules();
 422         config_init_globals();
 423         config_init_wireless();
 424
 425         config_init = false;
 426         device_unlock();
 427
 428         device_reset_old();
 429         device_init_pending();
 430         vlist_flush(&interfaces);
 431         device_free_unused(NULL);
 432         interface_refresh_assignments(false);
 433         interface_start_pending();
 434         wireless_start_pending();
 435
 436         return ret;
 437 }