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                 if (config_path)
 194                         uci_set_confdir(ctx, config_path);
 195
 196 #ifdef DUMMY_MODE
 197                 uci_set_savedir(ctx, "./tmp");
 198 #endif
 199         } else {
 200                 p = uci_lookup_package(ctx, config);
 201                 if (p)
 202                         uci_unload(ctx, p);
 203         }
 204
 205         if (uci_load(ctx, config, &p))
 206                 return NULL;
 207
 208         return p;
 209 }
 210
 211 static void
 212 config_init_interfaces(void)
 213 {
 214         struct uci_element *e;
 215
 216         uci_foreach_element(&uci_network->sections, e) {
 217                 struct uci_section *s = uci_to_section(e);
 218
 219                 if (!strcmp(s->type, "interface"))
 220                         config_parse_interface(s, false);
 221         }
 222
 223         uci_foreach_element(&uci_network->sections, e) {
 224                 struct uci_section *s = uci_to_section(e);
 225
 226                 if (!strcmp(s->type, "alias"))
 227                         config_parse_interface(s, true);
 228         }
 229 }
 230
 231 static void
 232 config_init_routes(void)
 233 {
 234         struct interface *iface;
 235         struct uci_element *e;
 236
 237         vlist_for_each_element(&interfaces, iface, node)
 238                 interface_ip_update_start(&iface->config_ip);
 239
 240         uci_foreach_element(&uci_network->sections, e) {
 241                 struct uci_section *s = uci_to_section(e);
 242
 243                 if (!strcmp(s->type, "route"))
 244                         config_parse_route(s, false);
 245                 else if (!strcmp(s->type, "route6"))
 246                         config_parse_route(s, true);
 247         }
 248
 249         vlist_for_each_element(&interfaces, iface, node)
 250                 interface_ip_update_complete(&iface->config_ip);
 251 }
 252
 253 static void
 254 config_init_rules(void)
 255 {
 256         struct uci_element *e;
 257
 258         iprule_update_start();
 259
 260         uci_foreach_element(&uci_network->sections, e) {
 261                 struct uci_section *s = uci_to_section(e);
 262
 263                 if (!strcmp(s->type, "rule"))
 264                         config_parse_rule(s, false);
 265                 else if (!strcmp(s->type, "rule6"))
 266                         config_parse_rule(s, true);
 267         }
 268
 269         iprule_update_complete();
 270 }
 271
 272 static void
 273 config_init_globals(void)
 274 {
 275         struct uci_section *globals = uci_lookup_section(
 276                         uci_ctx, uci_network, "globals");
 277         if (!globals)
 278                 return;
 279
 280         const char *ula_prefix = uci_lookup_option_string(
 281                         uci_ctx, globals, "ula_prefix");
 282         interface_ip_set_ula_prefix(ula_prefix);
 283 }
 284
 285 static void
 286 config_parse_wireless_device(struct uci_section *s)
 287 {
 288         struct wireless_driver *drv;
 289         const char *driver_name;
 290
 291         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 292         if (!driver_name)
 293                 return;
 294
 295         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 296         if (!drv)
 297                 return;
 298
 299         blob_buf_init(&b, 0);
 300         uci_to_blob(&b, s, drv->device.config);
 301         wireless_device_create(drv, s->e.name, b.head);
 302 }
 303
 304 static void
 305 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 306 {
 307         blob_buf_init(&b, 0);
 308         uci_to_blob(&b, s, wdev->drv->interface.config);
 309         wireless_interface_create(wdev, b.head, s->e.name);
 310 }
 311
 312 static void
 313 config_init_wireless(void)
 314 {
 315         struct wireless_device *wdev;
 316         struct uci_element *e;
 317         const char *dev_name;
 318
 319         if (!uci_wireless) {
 320                 DPRINTF("No wireless configuration found\n");
 321                 return;
 322         }
 323
 324         vlist_update(&wireless_devices);
 325
 326         uci_foreach_element(&uci_wireless->sections, e) {
 327                 struct uci_section *s = uci_to_section(e);
 328                 if (strcmp(s->type, "wifi-device") != 0)
 329                         continue;
 330
 331                 config_parse_wireless_device(s);
 332         }
 333
 334         vlist_flush(&wireless_devices);
 335
 336         vlist_for_each_element(&wireless_devices, wdev, node) {
 337                 wdev->vif_idx = 0;
 338                 vlist_update(&wdev->interfaces);
 339         }
 340
 341         uci_foreach_element(&uci_wireless->sections, e) {
 342                 struct uci_section *s = uci_to_section(e);
 343
 344                 if (strcmp(s->type, "wifi-iface") != 0)
 345                         continue;
 346
 347                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 348                 if (!dev_name)
 349                         continue;
 350
 351                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 352                 if (!wdev) {
 353                         DPRINTF("device %s not found!\n", dev_name);
 354                         continue;
 355                 }
 356
 357                 config_parse_wireless_interface(wdev, s);
 358         }
 359
 360         vlist_for_each_element(&wireless_devices, wdev, node)
 361                 vlist_flush(&wdev->interfaces);
 362 }
 363
 364 void
 365 config_init_all(void)
 366 {
 367         uci_network = config_init_package("network");
 368         if (!uci_network) {
 369                 fprintf(stderr, "Failed to load network config\n");
 370                 return;
 371         }
 372
 373         uci_wireless = config_init_package("wireless");
 374
 375         vlist_update(&interfaces);
 376         config_init = true;
 377         device_lock();
 378
 379         device_reset_config();
 380         config_init_devices();
 381         config_init_interfaces();
 382         config_init_routes();
 383         config_init_rules();
 384         config_init_globals();
 385         config_init_wireless();
 386
 387         config_init = false;
 388         device_unlock();
 389
 390         device_reset_old();
 391         device_init_pending();
 392         vlist_flush(&interfaces);
 393         device_free_unused(NULL);
 394         interface_refresh_assignments(false);
 395         interface_start_pending();
 396         wireless_start_pending();
 397 }