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 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include <uci.h>
  19
  20 #include "netifd.h"
  21 #include "interface.h"
  22 #include "interface-ip.h"
  23 #include "iprule.h"
  24 #include "proto.h"
  25 #include "wireless.h"
  26 #include "config.h"
  27
  28 bool config_init = false;
  29
  30 static struct uci_context *uci_ctx;
  31 static struct uci_package *uci_network;
  32 static struct uci_package *uci_wireless;
  33 static struct blob_buf b;
  34
  35 static int
  36 config_parse_bridge_interface(struct uci_section *s)
  37 {
  38         char *name;
  39
  40         name = alloca(strlen(s->e.name) + 4);
  41         sprintf(name, "br-%s", s->e.name);
  42         blobmsg_add_string(&b, "name", name);
  43
  44         uci_to_blob(&b, s, bridge_device_type.config_params);
  45         if (!device_create(name, &bridge_device_type, b.head)) {
  46                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
  47                 return -EINVAL;
  48         }
  49
  50         blob_buf_init(&b, 0);
  51         blobmsg_add_string(&b, "ifname", name);
  52         return 0;
  53 }
  54
  55 static void
  56 config_parse_interface(struct uci_section *s, bool alias)
  57 {
  58         struct interface *iface;
  59         const char *type = NULL, *disabled;
  60         struct blob_attr *config;
  61         struct device *dev;
  62         bool bridge = false;
  63
  64         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
  65         if (disabled && !strcmp(disabled, "1"))
  66                 return;
  67
  68         blob_buf_init(&b, 0);
  69
  70         if (!alias)
  71                 type = uci_lookup_option_string(uci_ctx, s, "type");
  72         if (type && !strcmp(type, "bridge")) {
  73                 if (config_parse_bridge_interface(s))
  74                         return;
  75
  76                 bridge = true;
  77         }
  78
  79         uci_to_blob(&b, s, &interface_attr_list);
  80
  81         iface = interface_alloc(s->e.name, b.head);
  82         if (!iface)
  83                 return;
  84
  85         if (iface->proto_handler && iface->proto_handler->config_params)
  86                 uci_to_blob(&b, s, iface->proto_handler->config_params);
  87
  88         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
  89                 iface->device_config = true;
  90
  91         config = blob_memdup(b.head);
  92         if (!config)
  93                 goto error;
  94
  95         if (alias) {
  96                 if (!interface_add_alias(iface, config))
  97                         goto error_free_config;
  98         } else {
  99                 interface_add(iface, config);
 100         }
 101
 102         /*
 103          * need to look up the interface name again, in case of config update,
 104          * the pointer will have changed
 105          */
 106         iface = vlist_find(&interfaces, s->e.name, iface, node);
 107         if (!iface)
 108                 return;
 109
 110         dev = iface->main_dev.dev;
 111         if (!dev || !dev->default_config)
 112                 return;
 113
 114         blob_buf_init(&b, 0);
 115         uci_to_blob(&b, s, dev->type->config_params);
 116         if (blob_len(b.head) == 0)
 117                 return;
 118
 119         device_set_config(dev, dev->type, b.head);
 120         return;
 121 error_free_config:
 122         free(config);
 123 error:
 124         free(iface);
 125 }
 126
 127 static void
 128 config_parse_route(struct uci_section *s, bool v6)
 129 {
 130         void *route;
 131
 132         blob_buf_init(&b, 0);
 133         route = blobmsg_open_array(&b, "route");
 134         uci_to_blob(&b, s, &route_attr_list);
 135         blobmsg_close_array(&b, route);
 136         interface_ip_add_route(NULL, blob_data(b.head), v6);
 137 }
 138
 139 static void
 140 config_parse_rule(struct uci_section *s, bool v6)
 141 {
 142         void *rule;
 143
 144         blob_buf_init(&b, 0);
 145         rule = blobmsg_open_array(&b, "rule");
 146         uci_to_blob(&b, s, &rule_attr_list);
 147         blobmsg_close_array(&b, rule);
 148         iprule_add(blob_data(b.head), v6);
 149 }
 150
 151 static void
 152 config_init_devices(void)
 153 {
 154         struct uci_element *e;
 155
 156         uci_foreach_element(&uci_network->sections, e) {
 157                 struct uci_section *s = uci_to_section(e);
 158                 const struct device_type *devtype = NULL;
 159                 const char *type, *name;
 160
 161                 if (strcmp(s->type, "device") != 0)
 162                         continue;
 163
 164                 name = uci_lookup_option_string(uci_ctx, s, "name");
 165                 if (!name)
 166                         continue;
 167
 168                 type = uci_lookup_option_string(uci_ctx, s, "type");
 169                 if (type) {
 170                         if (!strcmp(type, "bridge"))
 171                                 devtype = &bridge_device_type;
 172                         else if (!strcmp(type, "tunnel"))
 173                                 devtype = &tunnel_device_type;
 174                         else if (!strcmp(type, "macvlan"))
 175                                 devtype = &macvlan_device_type;
 176                 }
 177
 178                 if (!devtype)
 179                         devtype = &simple_device_type;
 180
 181                 blob_buf_init(&b, 0);
 182                 uci_to_blob(&b, s, devtype->config_params);
 183                 device_create(name, devtype, b.head);
 184         }
 185 }
 186
 187 static struct uci_package *
 188 config_init_package(const char *config)
 189 {
 190         struct uci_context *ctx = uci_ctx;
 191         struct uci_package *p = NULL;
 192
 193         if (!ctx) {
 194                 ctx = uci_alloc_context();
 195                 uci_ctx = ctx;
 196
 197                 ctx->flags &= ~UCI_FLAG_STRICT;
 198                 if (config_path)
 199                         uci_set_confdir(ctx, config_path);
 200
 201 #ifdef DUMMY_MODE
 202                 uci_set_savedir(ctx, "./tmp");
 203 #endif
 204         } else {
 205                 p = uci_lookup_package(ctx, config);
 206                 if (p)
 207                         uci_unload(ctx, p);
 208         }
 209
 210         if (uci_load(ctx, config, &p))
 211                 return NULL;
 212
 213         return p;
 214 }
 215
 216 static void
 217 config_init_interfaces(void)
 218 {
 219         struct uci_element *e;
 220
 221         uci_foreach_element(&uci_network->sections, e) {
 222                 struct uci_section *s = uci_to_section(e);
 223
 224                 if (!strcmp(s->type, "interface"))
 225                         config_parse_interface(s, false);
 226         }
 227
 228         uci_foreach_element(&uci_network->sections, e) {
 229                 struct uci_section *s = uci_to_section(e);
 230
 231                 if (!strcmp(s->type, "alias"))
 232                         config_parse_interface(s, true);
 233         }
 234 }
 235
 236 static void
 237 config_init_routes(void)
 238 {
 239         struct interface *iface;
 240         struct uci_element *e;
 241
 242         vlist_for_each_element(&interfaces, iface, node)
 243                 interface_ip_update_start(&iface->config_ip);
 244
 245         uci_foreach_element(&uci_network->sections, e) {
 246                 struct uci_section *s = uci_to_section(e);
 247
 248                 if (!strcmp(s->type, "route"))
 249                         config_parse_route(s, false);
 250                 else if (!strcmp(s->type, "route6"))
 251                         config_parse_route(s, true);
 252         }
 253
 254         vlist_for_each_element(&interfaces, iface, node)
 255                 interface_ip_update_complete(&iface->config_ip);
 256 }
 257
 258 static void
 259 config_init_rules(void)
 260 {
 261         struct uci_element *e;
 262
 263         iprule_update_start();
 264
 265         uci_foreach_element(&uci_network->sections, e) {
 266                 struct uci_section *s = uci_to_section(e);
 267
 268                 if (!strcmp(s->type, "rule"))
 269                         config_parse_rule(s, false);
 270                 else if (!strcmp(s->type, "rule6"))
 271                         config_parse_rule(s, true);
 272         }
 273
 274         iprule_update_complete();
 275 }
 276
 277 static void
 278 config_init_globals(void)
 279 {
 280         struct uci_section *globals = uci_lookup_section(
 281                         uci_ctx, uci_network, "globals");
 282         if (!globals)
 283                 return;
 284
 285         const char *ula_prefix = uci_lookup_option_string(
 286                         uci_ctx, globals, "ula_prefix");
 287         interface_ip_set_ula_prefix(ula_prefix);
 288 }
 289
 290 static void
 291 config_parse_wireless_device(struct uci_section *s)
 292 {
 293         struct wireless_driver *drv;
 294         const char *driver_name;
 295
 296         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 297         if (!driver_name)
 298                 return;
 299
 300         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 301         if (!drv)
 302                 return;
 303
 304         blob_buf_init(&b, 0);
 305         uci_to_blob(&b, s, drv->device.config);
 306         wireless_device_create(drv, s->e.name, b.head);
 307 }
 308
 309 static void
 310 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 311 {
 312         blob_buf_init(&b, 0);
 313         uci_to_blob(&b, s, wdev->drv->interface.config);
 314         wireless_interface_create(wdev, b.head, s->e.name);
 315 }
 316
 317 static void
 318 config_init_wireless(void)
 319 {
 320         struct wireless_device *wdev;
 321         struct uci_element *e;
 322         const char *dev_name;
 323
 324         if (!uci_wireless) {
 325                 DPRINTF("No wireless configuration found\n");
 326                 return;
 327         }
 328
 329         vlist_update(&wireless_devices);
 330
 331         uci_foreach_element(&uci_wireless->sections, e) {
 332                 struct uci_section *s = uci_to_section(e);
 333                 if (strcmp(s->type, "wifi-device") != 0)
 334                         continue;
 335
 336                 config_parse_wireless_device(s);
 337         }
 338
 339         vlist_flush(&wireless_devices);
 340
 341         vlist_for_each_element(&wireless_devices, wdev, node) {
 342                 wdev->vif_idx = 0;
 343                 vlist_update(&wdev->interfaces);
 344         }
 345
 346         uci_foreach_element(&uci_wireless->sections, e) {
 347                 struct uci_section *s = uci_to_section(e);
 348
 349                 if (strcmp(s->type, "wifi-iface") != 0)
 350                         continue;
 351
 352                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 353                 if (!dev_name)
 354                         continue;
 355
 356                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 357                 if (!wdev) {
 358                         DPRINTF("device %s not found!\n", dev_name);
 359                         continue;
 360                 }
 361
 362                 config_parse_wireless_interface(wdev, s);
 363         }
 364
 365         vlist_for_each_element(&wireless_devices, wdev, node)
 366                 vlist_flush(&wdev->interfaces);
 367 }
 368
 369 void
 370 config_init_all(void)
 371 {
 372         uci_network = config_init_package("network");
 373         if (!uci_network) {
 374                 fprintf(stderr, "Failed to load network config\n");
 375                 return;
 376         }
 377
 378         uci_wireless = config_init_package("wireless");
 379
 380         vlist_update(&interfaces);
 381         config_init = true;
 382         device_lock();
 383
 384         device_reset_config();
 385         config_init_devices();
 386         config_init_interfaces();
 387         config_init_routes();
 388         config_init_rules();
 389         config_init_globals();
 390         config_init_wireless();
 391
 392         config_init = false;
 393         device_unlock();
 394
 395         device_reset_old();
 396         device_init_pending();
 397         vlist_flush(&interfaces);
 398         device_free_unused(NULL);
 399         interface_refresh_assignments(false);
 400         interface_start_pending();
 401         wireless_start_pending();
 402 }