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_section_idx(struct uci_section *s)
  37 {
  38         struct uci_element *e;
  39         int idx = 0;
  40
  41         uci_foreach_element(&uci_wireless->sections, e) {
  42                 struct uci_section *cur = uci_to_section(e);
  43
  44                 if (s == cur)
  45                         return idx;
  46
  47                 if (!strcmp(cur->type, s->type))
  48                         idx++;
  49         }
  50
  51         return -1;
  52 }
  53
  54 static int
  55 config_parse_bridge_interface(struct uci_section *s)
  56 {
  57         char *name;
  58
  59         name = alloca(strlen(s->e.name) + 4);
  60         sprintf(name, "br-%s", s->e.name);
  61         blobmsg_add_string(&b, "name", name);
  62
  63         uci_to_blob(&b, s, bridge_device_type.config_params);
  64         if (!device_create(name, &bridge_device_type, b.head)) {
  65                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
  66                 return -EINVAL;
  67         }
  68
  69         blob_buf_init(&b, 0);
  70         blobmsg_add_string(&b, "ifname", name);
  71         return 0;
  72 }
  73
  74 static void
  75 config_parse_interface(struct uci_section *s, bool alias)
  76 {
  77         struct interface *iface;
  78         const char *type = NULL, *disabled;
  79         struct blob_attr *config;
  80         struct device *dev;
  81         bool bridge = false;
  82
  83         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
  84         if (disabled && !strcmp(disabled, "1"))
  85                 return;
  86
  87         blob_buf_init(&b, 0);
  88
  89         if (!alias)
  90                 type = uci_lookup_option_string(uci_ctx, s, "type");
  91         if (type && !strcmp(type, "bridge")) {
  92                 if (config_parse_bridge_interface(s))
  93                         return;
  94
  95                 bridge = true;
  96         }
  97
  98         uci_to_blob(&b, s, &interface_attr_list);
  99
 100         iface = interface_alloc(s->e.name, b.head);
 101         if (!iface)
 102                 return;
 103
 104         if (iface->proto_handler && iface->proto_handler->config_params)
 105                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 106
 107         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 108                 iface->device_config = true;
 109
 110         config = blob_memdup(b.head);
 111         if (!config)
 112                 goto error;
 113
 114         if (alias) {
 115                 if (!interface_add_alias(iface, config))
 116                         goto error_free_config;
 117         } else {
 118                 interface_add(iface, config);
 119         }
 120
 121         /*
 122          * need to look up the interface name again, in case of config update,
 123          * the pointer will have changed
 124          */
 125         iface = vlist_find(&interfaces, s->e.name, iface, node);
 126         if (!iface)
 127                 return;
 128
 129         dev = iface->main_dev.dev;
 130         if (!dev || !dev->default_config)
 131                 return;
 132
 133         blob_buf_init(&b, 0);
 134         uci_to_blob(&b, s, dev->type->config_params);
 135         if (blob_len(b.head) == 0)
 136                 return;
 137
 138         device_set_config(dev, dev->type, b.head);
 139         return;
 140 error_free_config:
 141         free(config);
 142 error:
 143         free(iface);
 144 }
 145
 146 static void
 147 config_parse_route(struct uci_section *s, bool v6)
 148 {
 149         void *route;
 150
 151         blob_buf_init(&b, 0);
 152         route = blobmsg_open_array(&b, "route");
 153         uci_to_blob(&b, s, &route_attr_list);
 154         blobmsg_close_array(&b, route);
 155         interface_ip_add_route(NULL, blob_data(b.head), v6);
 156 }
 157
 158 static void
 159 config_parse_rule(struct uci_section *s, bool v6)
 160 {
 161         void *rule;
 162
 163         blob_buf_init(&b, 0);
 164         rule = blobmsg_open_array(&b, "rule");
 165         uci_to_blob(&b, s, &rule_attr_list);
 166         blobmsg_close_array(&b, rule);
 167         iprule_add(blob_data(b.head), v6);
 168 }
 169
 170 static void
 171 config_init_devices(void)
 172 {
 173         struct uci_element *e;
 174
 175         uci_foreach_element(&uci_network->sections, e) {
 176                 struct uci_section *s = uci_to_section(e);
 177                 const struct device_type *devtype = NULL;
 178                 const char *type, *name;
 179
 180                 if (strcmp(s->type, "device") != 0)
 181                         continue;
 182
 183                 name = uci_lookup_option_string(uci_ctx, s, "name");
 184                 if (!name)
 185                         continue;
 186
 187                 type = uci_lookup_option_string(uci_ctx, s, "type");
 188                 if (type) {
 189                         if (!strcmp(type, "8021ad"))
 190                                 devtype = &vlandev_device_type;
 191                         else if (!strcmp(type, "8021q"))
 192                                 devtype = &vlandev_device_type;
 193                         else if (!strcmp(type, "bridge"))
 194                                 devtype = &bridge_device_type;
 195                         else if (!strcmp(type, "macvlan"))
 196                                 devtype = &macvlan_device_type;
 197                         else if (!strcmp(type, "tunnel"))
 198                                 devtype = &tunnel_device_type;
 199                 }
 200
 201                 if (!devtype)
 202                         devtype = &simple_device_type;
 203
 204                 blob_buf_init(&b, 0);
 205                 uci_to_blob(&b, s, devtype->config_params);
 206                 device_create(name, devtype, b.head);
 207         }
 208 }
 209
 210 static struct uci_package *
 211 config_init_package(const char *config)
 212 {
 213         struct uci_context *ctx = uci_ctx;
 214         struct uci_package *p = NULL;
 215
 216         if (!ctx) {
 217                 ctx = uci_alloc_context();
 218                 uci_ctx = ctx;
 219
 220                 ctx->flags &= ~UCI_FLAG_STRICT;
 221                 if (config_path)
 222                         uci_set_confdir(ctx, config_path);
 223
 224 #ifdef DUMMY_MODE
 225                 uci_set_savedir(ctx, "./tmp");
 226 #endif
 227         } else {
 228                 p = uci_lookup_package(ctx, config);
 229                 if (p)
 230                         uci_unload(ctx, p);
 231         }
 232
 233         if (uci_load(ctx, config, &p))
 234                 return NULL;
 235
 236         return p;
 237 }
 238
 239 static void
 240 config_init_interfaces(void)
 241 {
 242         struct uci_element *e;
 243
 244         uci_foreach_element(&uci_network->sections, e) {
 245                 struct uci_section *s = uci_to_section(e);
 246
 247                 if (!strcmp(s->type, "interface"))
 248                         config_parse_interface(s, false);
 249         }
 250
 251         uci_foreach_element(&uci_network->sections, e) {
 252                 struct uci_section *s = uci_to_section(e);
 253
 254                 if (!strcmp(s->type, "alias"))
 255                         config_parse_interface(s, true);
 256         }
 257 }
 258
 259 static void
 260 config_init_routes(void)
 261 {
 262         struct interface *iface;
 263         struct uci_element *e;
 264
 265         vlist_for_each_element(&interfaces, iface, node)
 266                 interface_ip_update_start(&iface->config_ip);
 267
 268         uci_foreach_element(&uci_network->sections, e) {
 269                 struct uci_section *s = uci_to_section(e);
 270
 271                 if (!strcmp(s->type, "route"))
 272                         config_parse_route(s, false);
 273                 else if (!strcmp(s->type, "route6"))
 274                         config_parse_route(s, true);
 275         }
 276
 277         vlist_for_each_element(&interfaces, iface, node)
 278                 interface_ip_update_complete(&iface->config_ip);
 279 }
 280
 281 static void
 282 config_init_rules(void)
 283 {
 284         struct uci_element *e;
 285
 286         iprule_update_start();
 287
 288         uci_foreach_element(&uci_network->sections, e) {
 289                 struct uci_section *s = uci_to_section(e);
 290
 291                 if (!strcmp(s->type, "rule"))
 292                         config_parse_rule(s, false);
 293                 else if (!strcmp(s->type, "rule6"))
 294                         config_parse_rule(s, true);
 295         }
 296
 297         iprule_update_complete();
 298 }
 299
 300 static void
 301 config_init_globals(void)
 302 {
 303         struct uci_section *globals = uci_lookup_section(
 304                         uci_ctx, uci_network, "globals");
 305         if (!globals)
 306                 return;
 307
 308         const char *ula_prefix = uci_lookup_option_string(
 309                         uci_ctx, globals, "ula_prefix");
 310         interface_ip_set_ula_prefix(ula_prefix);
 311 }
 312
 313 static void
 314 config_parse_wireless_device(struct uci_section *s)
 315 {
 316         struct wireless_driver *drv;
 317         const char *driver_name;
 318
 319         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 320         if (!driver_name)
 321                 return;
 322
 323         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 324         if (!drv)
 325                 return;
 326
 327         blob_buf_init(&b, 0);
 328         uci_to_blob(&b, s, drv->device.config);
 329         wireless_device_create(drv, s->e.name, b.head);
 330 }
 331
 332 static void
 333 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 334 {
 335         char *name = NULL;
 336
 337         if (s->anonymous) {
 338                 name = alloca(strlen(s->type) + 16);
 339                 asprintf(&name, "@%s[%d]", s->type, config_section_idx(s));
 340         }
 341
 342         blob_buf_init(&b, 0);
 343         uci_to_blob(&b, s, wdev->drv->interface.config);
 344         wireless_interface_create(wdev, b.head, name ? name : s->e.name);
 345 }
 346
 347 static void
 348 config_init_wireless(void)
 349 {
 350         struct wireless_device *wdev;
 351         struct uci_element *e;
 352         const char *dev_name;
 353
 354         if (!uci_wireless) {
 355                 DPRINTF("No wireless configuration found\n");
 356                 return;
 357         }
 358
 359         vlist_update(&wireless_devices);
 360
 361         uci_foreach_element(&uci_wireless->sections, e) {
 362                 struct uci_section *s = uci_to_section(e);
 363                 if (strcmp(s->type, "wifi-device") != 0)
 364                         continue;
 365
 366                 config_parse_wireless_device(s);
 367         }
 368
 369         vlist_flush(&wireless_devices);
 370
 371         vlist_for_each_element(&wireless_devices, wdev, node) {
 372                 wdev->vif_idx = 0;
 373                 vlist_update(&wdev->interfaces);
 374         }
 375
 376         uci_foreach_element(&uci_wireless->sections, e) {
 377                 struct uci_section *s = uci_to_section(e);
 378
 379                 if (strcmp(s->type, "wifi-iface") != 0)
 380                         continue;
 381
 382                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 383                 if (!dev_name)
 384                         continue;
 385
 386                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 387                 if (!wdev) {
 388                         DPRINTF("device %s not found!\n", dev_name);
 389                         continue;
 390                 }
 391
 392                 config_parse_wireless_interface(wdev, s);
 393         }
 394
 395         vlist_for_each_element(&wireless_devices, wdev, node)
 396                 vlist_flush(&wdev->interfaces);
 397 }
 398
 399 void
 400 config_init_all(void)
 401 {
 402         uci_network = config_init_package("network");
 403         if (!uci_network) {
 404                 fprintf(stderr, "Failed to load network config\n");
 405                 return;
 406         }
 407
 408         uci_wireless = config_init_package("wireless");
 409
 410         vlist_update(&interfaces);
 411         config_init = true;
 412         device_lock();
 413
 414         device_reset_config();
 415         config_init_devices();
 416         config_init_interfaces();
 417         config_init_routes();
 418         config_init_rules();
 419         config_init_globals();
 420         config_init_wireless();
 421
 422         config_init = false;
 423         device_unlock();
 424
 425         device_reset_old();
 426         device_init_pending();
 427         vlist_flush(&interfaces);
 428         device_free_unused(NULL);
 429         interface_refresh_assignments(false);
 430         interface_start_pending();
 431         wireless_start_pending();
 432 }