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