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