proto.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 <arpa/inet.h>
  19 #include <netinet/in.h>
  20
  21 #include "netifd.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "proto.h"
  25
  26 static struct avl_tree handlers;
  27
  28 enum {
  29         OPT_IPADDR,
  30         OPT_IP6ADDR,
  31         OPT_NETMASK,
  32         OPT_BROADCAST,
  33         OPT_GATEWAY,
  34         OPT_IP6GW,
  35         OPT_DNS,
  36         OPT_DNS_SEARCH,
  37         __OPT_MAX,
  38 };
  39
  40 static const struct blobmsg_policy proto_ip_attributes[__OPT_MAX] = {
  41         [OPT_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
  42         [OPT_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
  43         [OPT_NETMASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  44         [OPT_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  45         [OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  46         [OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
  47         [OPT_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  48         [OPT_DNS_SEARCH] = { .name = "dns_search", .type = BLOBMSG_TYPE_ARRAY },
  49 };
  50
  51 static const union config_param_info proto_ip_attr_info[__OPT_MAX] = {
  52         [OPT_IPADDR] = { .type = BLOBMSG_TYPE_STRING },
  53         [OPT_IP6ADDR] = { .type = BLOBMSG_TYPE_STRING },
  54         [OPT_DNS] = { .type = BLOBMSG_TYPE_STRING },
  55 };
  56
  57 const struct config_param_list proto_ip_attr = {
  58         .n_params = __OPT_MAX,
  59         .params = proto_ip_attributes,
  60         .info = proto_ip_attr_info,
  61 };
  62
  63 enum {
  64         ADDR_IPADDR,
  65         ADDR_MASK,
  66         ADDR_BROADCAST,
  67         ADDR_PTP,
  68         __ADDR_MAX
  69 };
  70
  71 static const struct blobmsg_policy proto_ip_addr[__ADDR_MAX] = {
  72         [ADDR_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING },
  73         [ADDR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_STRING },
  74         [ADDR_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  75         [ADDR_PTP] = { .name = "ptp", .type = BLOBMSG_TYPE_STRING },
  76 };
  77
  78 unsigned int
  79 parse_netmask_string(const char *str, bool v6)
  80 {
  81         struct in_addr addr;
  82         unsigned int ret;
  83         char *err = NULL;
  84
  85         if (!strchr(str, '.')) {
  86                 ret = strtoul(str, &err, 0);
  87                 if (err && *err)
  88                         goto error;
  89
  90                 return ret;
  91         }
  92
  93         if (v6)
  94                 goto error;
  95
  96         if (inet_aton(str, &addr) != 1)
  97                 goto error;
  98
  99         return 32 - fls(~(ntohl(addr.s_addr)));
 100
 101 error:
 102         return ~0;
 103 }
 104
 105 static bool
 106 split_netmask(char *str, unsigned int *netmask, bool v6)
 107 {
 108         char *delim = strchr(str, '/');
 109
 110         if (delim) {
 111                 *(delim++) = 0;
 112
 113                 *netmask = parse_netmask_string(delim, v6);
 114         }
 115         return true;
 116 }
 117
 118 static int
 119 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
 120 {
 121         char *astr = alloca(strlen(str) + 1);
 122
 123         strcpy(astr, str);
 124         if (!split_netmask(astr, netmask, af == AF_INET6))
 125                 return 0;
 126
 127         if (af == AF_INET6) {
 128                 if (*netmask > 128)
 129                         return 0;
 130         } else {
 131                 if (*netmask > 32)
 132                         return 0;
 133         }
 134
 135         return inet_pton(af, astr, addr);
 136 }
 137
 138 static struct device_addr *
 139 alloc_device_addr(bool v6, bool ext)
 140 {
 141         struct device_addr *addr;
 142
 143         addr = calloc(1, sizeof(*addr));
 144         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 145         if (ext)
 146                 addr->flags |= DEVADDR_EXTERNAL;
 147
 148         return addr;
 149 }
 150
 151 static bool
 152 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
 153            bool ext, uint32_t broadcast)
 154 {
 155         struct device_addr *addr;
 156         int af = v6 ? AF_INET6 : AF_INET;
 157
 158         addr = alloc_device_addr(v6, ext);
 159         if (!addr)
 160                 return false;
 161
 162         addr->mask = mask;
 163         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
 164                 interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 165                 free(addr);
 166                 return false;
 167         }
 168
 169         if (broadcast)
 170                 addr->broadcast = broadcast;
 171
 172         vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 173         return true;
 174 }
 175
 176 static int
 177 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 178                             bool v6, int netmask, bool ext, uint32_t broadcast)
 179 {
 180         struct blob_attr *cur;
 181         int n_addr = 0;
 182         int rem;
 183
 184         blobmsg_for_each_attr(cur, attr, rem) {
 185                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 186                         return -1;
 187
 188                 n_addr++;
 189                 if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
 190                                 broadcast))
 191                         return -1;
 192         }
 193
 194         return n_addr;
 195 }
 196
 197 static struct device_addr *
 198 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 199 {
 200         struct device_addr *addr;
 201         struct blob_attr *tb[__ADDR_MAX];
 202         struct blob_attr *cur;
 203
 204         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 205                 return NULL;
 206
 207         addr = alloc_device_addr(v6, ext);
 208         if (!addr)
 209                 return NULL;
 210
 211         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 212
 213         addr->mask = v6 ? 128 : 32;
 214         if ((cur = tb[ADDR_MASK])) {
 215                 unsigned int new_mask;
 216
 217                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 218                 if (new_mask > addr->mask)
 219                         goto error;
 220
 221                 addr->mask = new_mask;
 222         }
 223
 224         cur = tb[ADDR_IPADDR];
 225         if (!cur)
 226                 goto error;
 227
 228         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 229                 goto error;
 230
 231         if (!v6) {
 232                 if ((cur = tb[ADDR_BROADCAST]) &&
 233                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 234                         goto error;
 235                 if ((cur = tb[ADDR_PTP]) &&
 236                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 237                         goto error;
 238         }
 239
 240         return addr;
 241
 242 error:
 243         free(addr);
 244         return NULL;
 245 }
 246
 247 static int
 248 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 249                    bool ext)
 250 {
 251         struct device_addr *addr;
 252         struct blob_attr *cur;
 253         int n_addr = 0;
 254         int rem;
 255
 256         blobmsg_for_each_attr(cur, attr, rem) {
 257                 addr = parse_address_item(cur, v6, ext);
 258                 if (!addr)
 259                         return -1;
 260
 261                 n_addr++;
 262                 vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 263         }
 264
 265         return n_addr;
 266 }
 267
 268 static bool
 269 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 270 {
 271         struct device_route *route;
 272         const char *str = blobmsg_data(attr);
 273         int af = v6 ? AF_INET6 : AF_INET;
 274
 275         route = calloc(1, sizeof(*route));
 276         if (!inet_pton(af, str, &route->nexthop)) {
 277                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 278                 free(route);
 279                 return false;
 280         }
 281
 282         route->mask = 0;
 283         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 284         vlist_add(&iface->proto_ip.route, &route->node, &route->flags);
 285
 286         return true;
 287 }
 288
 289 int
 290 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 291 {
 292         struct blob_attr *tb[__OPT_MAX];
 293         struct blob_attr *cur;
 294         const char *error;
 295         unsigned int netmask = 32;
 296         int n_v4 = 0, n_v6 = 0;
 297         struct in_addr bcast = {};
 298
 299         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 300
 301         if ((cur = tb[OPT_NETMASK])) {
 302                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 303                 if (netmask > 32) {
 304                         error = "INVALID_NETMASK";
 305                         goto error;
 306                 }
 307         }
 308
 309         if ((cur = tb[OPT_BROADCAST])) {
 310                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 311                         error = "INVALID_BROADCAST";
 312                         goto error;
 313                 }
 314         }
 315
 316         if ((cur = tb[OPT_IPADDR]))
 317                 n_v4 = parse_static_address_option(iface, cur, false,
 318                         netmask, false, bcast.s_addr);
 319
 320         if ((cur = tb[OPT_IP6ADDR]))
 321                 n_v6 = parse_static_address_option(iface, cur, true,
 322                         netmask, false, 0);
 323
 324         if (!n_v4 && !n_v6) {
 325                 error = "NO_ADDRESS";
 326                 goto error;
 327         }
 328
 329         if (n_v4 < 0 || n_v6 < 0)
 330                 goto out;
 331
 332         if ((cur = tb[OPT_GATEWAY])) {
 333                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 334                         goto out;
 335         }
 336
 337         if ((cur = tb[OPT_IP6GW])) {
 338                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 339                         goto out;
 340         }
 341
 342         if ((cur = tb[OPT_DNS]))
 343                 interface_add_dns_server_list(&iface->proto_ip, cur);
 344
 345         if ((cur = tb[OPT_DNS_SEARCH]))
 346                 interface_add_dns_search_list(&iface->proto_ip, cur);
 347
 348         return 0;
 349
 350 error:
 351         interface_add_error(iface, "proto", error, NULL, 0);
 352 out:
 353         return -1;
 354 }
 355
 356 int
 357 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 358 {
 359         struct blob_attr *tb[__OPT_MAX];
 360         struct blob_attr *cur;
 361         const char *error;
 362         int n_v4 = 0, n_v6 = 0;
 363
 364         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 365
 366         if ((cur = tb[OPT_IPADDR]))
 367                 n_v4 = parse_address_list(iface, cur, false, ext);
 368
 369         if ((cur = tb[OPT_IP6ADDR]))
 370                 n_v6 = parse_address_list(iface, cur, true, ext);
 371
 372         if (!n_v4 && !n_v6) {
 373                 error = "NO_ADDRESS";
 374                 goto error;
 375         }
 376
 377         if (n_v4 < 0 || n_v6 < 0)
 378                 goto out;
 379
 380         if ((cur = tb[OPT_GATEWAY])) {
 381                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 382                         goto out;
 383         }
 384
 385         if ((cur = tb[OPT_IP6GW])) {
 386                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 387                         goto out;
 388         }
 389
 390         if ((cur = tb[OPT_DNS]))
 391                 interface_add_dns_server_list(&iface->proto_ip, cur);
 392
 393         if ((cur = tb[OPT_DNS_SEARCH]))
 394                 interface_add_dns_search_list(&iface->proto_ip, cur);
 395
 396         return 0;
 397
 398 error:
 399         interface_add_error(iface, "proto", error, NULL, 0);
 400 out:
 401         return -1;
 402 }
 403
 404 void add_proto_handler(struct proto_handler *p)
 405 {
 406         if (!handlers.comp)
 407                 avl_init(&handlers, avl_strcmp, false, NULL);
 408
 409         if (p->avl.key)
 410                 return;
 411
 412         p->avl.key = p->name;
 413         avl_insert(&handlers, &p->avl);
 414 }
 415
 416 static void
 417 default_proto_free(struct interface_proto_state *proto)
 418 {
 419         free(proto);
 420 }
 421
 422 static int
 423 invalid_proto_handler(struct interface_proto_state *proto,
 424                       enum interface_proto_cmd cmd, bool force)
 425 {
 426         return -1;
 427 }
 428
 429 static int
 430 no_proto_handler(struct interface_proto_state *proto,
 431                  enum interface_proto_cmd cmd, bool force)
 432 {
 433         return 0;
 434 }
 435
 436 static struct interface_proto_state *
 437 default_proto_attach(const struct proto_handler *h,
 438                      struct interface *iface, struct blob_attr *attr)
 439 {
 440         struct interface_proto_state *proto;
 441
 442         proto = calloc(1, sizeof(*proto));
 443         proto->free = default_proto_free;
 444         proto->cb = no_proto_handler;
 445
 446         return proto;
 447 }
 448
 449 static const struct proto_handler no_proto = {
 450         .name = "none",
 451         .flags = PROTO_FLAG_IMMEDIATE,
 452         .attach = default_proto_attach,
 453 };
 454
 455 static const struct proto_handler *
 456 get_proto_handler(const char *name)
 457 {
 458         struct proto_handler *proto;
 459
 460         if (!strcmp(name, "none"))
 461             return &no_proto;
 462
 463         if (!handlers.comp)
 464                 return NULL;
 465
 466         return avl_find_element(&handlers, name, proto, avl);
 467 }
 468
 469 void
 470 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 471 {
 472         const struct proto_handler *proto = iface->proto_handler;
 473         struct interface_proto_state *state = NULL;
 474
 475         if (!proto)
 476                 proto = &no_proto;
 477
 478         state = proto->attach(proto, iface, attr);
 479         if (!state) {
 480                 state = no_proto.attach(&no_proto, iface, attr);
 481                 state->cb = invalid_proto_handler;
 482         }
 483
 484         state->handler = proto;
 485         interface_set_proto_state(iface, state);
 486 }
 487
 488 void
 489 proto_attach_interface(struct interface *iface, const char *proto_name)
 490 {
 491         const struct proto_handler *proto = &no_proto;
 492
 493         if (proto_name) {
 494                 proto = get_proto_handler(proto_name);
 495                 if (!proto) {
 496                         interface_add_error(iface, "proto", "INVALID_PROTO", NULL, 0);
 497                         proto = &no_proto;
 498                 }
 499         }
 500
 501         iface->proto_handler = proto;
 502 }
 503
 504 int
 505 interface_proto_event(struct interface_proto_state *proto,
 506                       enum interface_proto_cmd cmd, bool force)
 507 {
 508         enum interface_proto_event ev;
 509         int ret;
 510
 511         ret = proto->cb(proto, cmd, force);
 512         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 513                 goto out;
 514
 515         switch(cmd) {
 516         case PROTO_CMD_SETUP:
 517                 ev = IFPEV_UP;
 518                 break;
 519         case PROTO_CMD_TEARDOWN:
 520                 ev = IFPEV_DOWN;
 521                 break;
 522         default:
 523                 return -EINVAL;
 524         }
 525         proto->proto_event(proto, ev);
 526
 527 out:
 528         return ret;
 529 }