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 "proto.h"
  24 #include "config.h"
  25
  26 bool config_init = false;
  27
  28 static struct uci_context *uci_ctx;
  29 static struct uci_package *uci_network;
  30 static struct blob_buf b;
  31
  32 static bool uci_attr_to_blob(struct blob_buf *b, const char *str,
  33                              const char *name, enum blobmsg_type type)
  34 {
  35         char *err;
  36         int intval;
  37
  38         switch (type) {
  39         case BLOBMSG_TYPE_STRING:
  40                 blobmsg_add_string(b, name, str);
  41                 break;
  42         case BLOBMSG_TYPE_BOOL:
  43                 if (!strcmp(str, "true") || !strcmp(str, "1"))
  44                         intval = 1;
  45                 else if (!strcmp(str, "false") || !strcmp(str, "0"))
  46                         intval = 0;
  47                 else
  48                         return false;
  49
  50                 blobmsg_add_u8(b, name, intval);
  51                 break;
  52         case BLOBMSG_TYPE_INT32:
  53                 intval = strtol(str, &err, 0);
  54                 if (*err)
  55                         return false;
  56
  57                 blobmsg_add_u32(b, name, intval);
  58                 break;
  59         default:
  60                 return false;
  61         }
  62         return true;
  63 }
  64
  65 static void uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
  66                               enum blobmsg_type type)
  67 {
  68         struct uci_element *e;
  69         char *str, *next, *word;
  70
  71         if (o->type == UCI_TYPE_LIST) {
  72                 uci_foreach_element(&o->v.list, e) {
  73                         uci_attr_to_blob(b, e->name, NULL, type);
  74                 }
  75                 return;
  76         }
  77
  78         str = strdup(o->v.string);
  79         next = str;
  80
  81         while ((word = strsep(&next, " \t")) != NULL) {
  82                 if (!*word)
  83                         continue;
  84
  85                 uci_attr_to_blob(b, word, NULL, type);
  86         }
  87
  88         free(str);
  89 }
  90
  91 static int __uci_to_blob(struct blob_buf *b, struct uci_section *s,
  92                          const struct config_param_list *p)
  93 {
  94         const struct blobmsg_policy *attr = NULL;
  95         struct uci_element *e;
  96         struct uci_option *o;
  97         void *array;
  98         int i, ret = 0;
  99
 100         uci_foreach_element(&s->options, e) {
 101                 for (i = 0; i < p->n_params; i++) {
 102                         attr = &p->params[i];
 103                         if (!strcmp(attr->name, e->name))
 104                                 break;
 105                 }
 106
 107                 if (i == p->n_params)
 108                         continue;
 109
 110                 o = uci_to_option(e);
 111
 112                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
 113                         if (!p->info)
 114                                 continue;
 115
 116                         array = blobmsg_open_array(b, attr->name);
 117                         uci_array_to_blob(b, o, p->info[i].type);
 118                         blobmsg_close_array(b, array);
 119                         ret++;
 120                         continue;
 121                 }
 122
 123                 if (o->type == UCI_TYPE_LIST)
 124                         continue;
 125
 126                 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 127         }
 128
 129         return ret;
 130 }
 131
 132 static int uci_to_blob(struct blob_buf *b, struct uci_section *s,
 133                        const struct config_param_list *p)
 134 {
 135         int ret = 0;
 136         int i;
 137
 138         ret += __uci_to_blob(b, s, p);
 139         for (i = 0; i < p->n_next; i++)
 140                 ret += uci_to_blob(b, s, p->next[i]);
 141
 142         return ret;
 143 }
 144
 145 static int
 146 config_parse_bridge_interface(struct uci_section *s)
 147 {
 148         char *name;
 149
 150         name = alloca(strlen(s->e.name) + 4);
 151         sprintf(name, "br-%s", s->e.name);
 152         blobmsg_add_string(&b, "name", name);
 153
 154         uci_to_blob(&b, s, bridge_device_type.config_params);
 155         if (!device_create(name, &bridge_device_type, b.head)) {
 156                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
 157                 return -EINVAL;
 158         }
 159
 160         blob_buf_init(&b, 0);
 161         blobmsg_add_string(&b, "ifname", name);
 162         return 0;
 163 }
 164
 165 static void
 166 config_parse_interface(struct uci_section *s, bool alias)
 167 {
 168         struct interface *iface;
 169         const char *type = NULL;
 170         struct blob_attr *config;
 171         struct device *dev;
 172         bool bridge = false;
 173
 174         blob_buf_init(&b, 0);
 175
 176         if (!alias)
 177                 type = uci_lookup_option_string(uci_ctx, s, "type");
 178         if (type && !strcmp(type, "bridge")) {
 179                 if (config_parse_bridge_interface(s))
 180                         return;
 181
 182                 bridge = true;
 183         }
 184
 185         uci_to_blob(&b, s, &interface_attr_list);
 186         iface = calloc(1, sizeof(*iface));
 187         if (!iface)
 188                 return;
 189
 190         interface_init(iface, s->e.name, b.head);
 191
 192         if (iface->proto_handler && iface->proto_handler->config_params)
 193                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 194
 195         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 196                 iface->device_config = true;
 197
 198         config = malloc(blob_pad_len(b.head));
 199         if (!config)
 200                 goto error;
 201
 202         memcpy(config, b.head, blob_pad_len(b.head));
 203
 204         if (alias) {
 205                 if (!interface_add_alias(iface, config))
 206                         goto error_free_config;
 207         } else {
 208                 interface_add(iface, config);
 209         }
 210
 211         /*
 212          * need to look up the interface name again, in case of config update,
 213          * the pointer will have changed
 214          */
 215         iface = vlist_find(&interfaces, s->e.name, iface, node);
 216         if (!iface)
 217                 return;
 218
 219         dev = iface->main_dev.dev;
 220         if (!dev || !dev->default_config)
 221                 return;
 222
 223         blob_buf_init(&b, 0);
 224         uci_to_blob(&b, s, dev->type->config_params);
 225         if (blob_len(b.head) == 0)
 226                 return;
 227
 228         device_set_config(dev, dev->type, b.head);
 229         return;
 230 error_free_config:
 231         free(config);
 232 error:
 233         free(iface);
 234 }
 235
 236 static void
 237 config_parse_route(struct uci_section *s, bool v6)
 238 {
 239         void *route;
 240
 241         blob_buf_init(&b, 0);
 242         route = blobmsg_open_array(&b, "route");
 243         uci_to_blob(&b, s, &route_attr_list);
 244         blobmsg_close_array(&b, route);
 245         interface_ip_add_route(NULL, blob_data(b.head), v6);
 246 }
 247
 248 static void
 249 config_init_devices(void)
 250 {
 251         struct uci_element *e;
 252
 253         uci_foreach_element(&uci_network->sections, e) {
 254                 struct uci_section *s = uci_to_section(e);
 255                 const struct device_type *devtype = NULL;
 256                 const char *type, *name;
 257
 258                 if (strcmp(s->type, "device") != 0)
 259                         continue;
 260
 261                 name = uci_lookup_option_string(uci_ctx, s, "name");
 262                 if (!name)
 263                         continue;
 264
 265                 type = uci_lookup_option_string(uci_ctx, s, "type");
 266                 if (type) {
 267                         if (!strcmp(type, "bridge"))
 268                                 devtype = &bridge_device_type;
 269                         else if (!strcmp(type, "tunnel"))
 270                                 devtype = &tunnel_device_type;
 271                 }
 272
 273                 if (!devtype)
 274                         devtype = &simple_device_type;
 275
 276                 blob_buf_init(&b, 0);
 277                 uci_to_blob(&b, s, devtype->config_params);
 278                 device_create(name, devtype, b.head);
 279         }
 280 }
 281
 282 bool
 283 config_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 284             const struct config_param_list *config, unsigned long *diff)
 285 {
 286         bool ret = false;
 287         int i;
 288
 289         for (i = 0; i < config->n_params; i++) {
 290                 if (!tb1[i] && !tb2[i])
 291                         continue;
 292
 293                 if (!!tb1[i] != !!tb2[i])
 294                         goto mark;
 295
 296                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 297                         goto mark;
 298
 299                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 300                         goto mark;
 301
 302                 continue;
 303
 304 mark:
 305                 ret = true;
 306                 if (diff)
 307                         set_bit(diff, i);
 308                 else
 309                         return ret;
 310         }
 311
 312         return ret;
 313 }
 314
 315
 316 static bool
 317 __config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 318                      const struct config_param_list *config)
 319 {
 320         struct blob_attr **tb1, **tb2;
 321
 322         if (!!c1 ^ !!c2)
 323                 return false;
 324
 325         if (!c1 && !c2)
 326                 return true;
 327
 328         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 329         blobmsg_parse(config->params, config->n_params, tb1,
 330                 blob_data(c1), blob_len(c1));
 331
 332         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 333         blobmsg_parse(config->params, config->n_params, tb2,
 334                 blob_data(c2), blob_len(c2));
 335
 336         return !config_diff(tb1, tb2, config, NULL);
 337 }
 338
 339 bool
 340 config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 341                    const struct config_param_list *config)
 342 {
 343         int i;
 344
 345         if (!__config_check_equal(c1, c2, config))
 346                 return false;
 347
 348         for (i = 0; i < config->n_next; i++) {
 349                 if (!__config_check_equal(c1, c2, config->next[i]))
 350                         return false;
 351         }
 352
 353         return true;
 354 }
 355
 356 struct blob_attr *
 357 config_memdup(struct blob_attr *attr)
 358 {
 359         struct blob_attr *ret;
 360         int size = blob_pad_len(attr);
 361
 362         ret = malloc(size);
 363         if (!ret)
 364                 return NULL;
 365
 366         memcpy(ret, attr, size);
 367         return ret;
 368 }
 369
 370 static struct uci_package *
 371 config_init_package(const char *config)
 372 {
 373         struct uci_context *ctx = uci_ctx;
 374         struct uci_package *p = NULL;
 375
 376         if (!ctx) {
 377                 ctx = uci_alloc_context();
 378                 uci_ctx = ctx;
 379
 380 #ifdef DUMMY_MODE
 381                 uci_set_confdir(ctx, "./config");
 382                 uci_set_savedir(ctx, "./tmp");
 383 #endif
 384         } else {
 385                 p = uci_lookup_package(ctx, config);
 386                 if (p)
 387                         uci_unload(ctx, p);
 388         }
 389
 390         if (uci_load(ctx, config, &p))
 391                 return NULL;
 392
 393         return p;
 394 }
 395
 396 static void
 397 config_init_interfaces(void)
 398 {
 399         struct uci_element *e;
 400
 401         uci_foreach_element(&uci_network->sections, e) {
 402                 struct uci_section *s = uci_to_section(e);
 403
 404                 if (!strcmp(s->type, "interface"))
 405                         config_parse_interface(s, false);
 406         }
 407
 408         uci_foreach_element(&uci_network->sections, e) {
 409                 struct uci_section *s = uci_to_section(e);
 410
 411                 if (!strcmp(s->type, "alias"))
 412                         config_parse_interface(s, true);
 413         }
 414 }
 415
 416 static void
 417 config_init_routes(void)
 418 {
 419         struct interface *iface;
 420         struct uci_element *e;
 421
 422         vlist_for_each_element(&interfaces, iface, node)
 423                 interface_ip_update_start(&iface->config_ip);
 424
 425         uci_foreach_element(&uci_network->sections, e) {
 426                 struct uci_section *s = uci_to_section(e);
 427
 428                 if (!strcmp(s->type, "route"))
 429                         config_parse_route(s, false);
 430                 else if (!strcmp(s->type, "route6"))
 431                         config_parse_route(s, true);
 432         }
 433
 434         vlist_for_each_element(&interfaces, iface, node)
 435                 interface_ip_update_complete(&iface->config_ip);
 436 }
 437
 438 void
 439 config_init_all(void)
 440 {
 441         uci_network = config_init_package("network");
 442         if (!uci_network) {
 443                 fprintf(stderr, "Failed to load network config\n");
 444                 return;
 445         }
 446
 447         vlist_update(&interfaces);
 448         config_init = true;
 449         device_lock();
 450
 451         device_reset_config();
 452         config_init_devices();
 453         config_init_interfaces();
 454         config_init_routes();
 455
 456         config_init = false;
 457         device_unlock();
 458
 459         device_reset_old();
 460         device_init_pending();
 461         vlist_flush(&interfaces);
 462         device_free_unused(NULL);
 463         interface_start_pending();
 464 }