proto.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2012 Steven Barth <steven@midlink.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <limits.h>
  19
  20 #include <arpa/inet.h>
  21 #include <netinet/in.h>
  22
  23 #include "netifd.h"
  24 #include "system.h"
  25 #include "interface.h"
  26 #include "interface-ip.h"
  27 #include "proto.h"
  28
  29 static struct avl_tree handlers;
  30
  31 enum {
  32         OPT_IPADDR,
  33         OPT_IP6ADDR,
  34         OPT_NETMASK,
  35         OPT_BROADCAST,
  36         OPT_GATEWAY,
  37         OPT_IP6GW,
  38         OPT_IP6PREFIX,
  39         __OPT_MAX,
  40 };
  41
  42 static const struct blobmsg_policy proto_ip_attributes[__OPT_MAX] = {
  43         [OPT_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
  44         [OPT_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
  45         [OPT_NETMASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  46         [OPT_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  47         [OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  48         [OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
  49         [OPT_IP6PREFIX] = { .name = "ip6prefix", .type = BLOBMSG_TYPE_ARRAY },
  50 };
  51
  52 static const struct uci_blob_param_info proto_ip_attr_info[__OPT_MAX] = {
  53         [OPT_IPADDR] = { .type = BLOBMSG_TYPE_STRING },
  54         [OPT_IP6ADDR] = { .type = BLOBMSG_TYPE_STRING },
  55         [OPT_IP6PREFIX] = { .type = BLOBMSG_TYPE_STRING },
  56 };
  57
  58 const struct uci_blob_param_list proto_ip_attr = {
  59         .n_params = __OPT_MAX,
  60         .params = proto_ip_attributes,
  61         .info = proto_ip_attr_info,
  62 };
  63
  64 enum {
  65         ADDR_IPADDR,
  66         ADDR_MASK,
  67         ADDR_BROADCAST,
  68         ADDR_PTP,
  69         ADDR_PREFERRED,
  70         ADDR_VALID,
  71         ADDR_OFFLINK,
  72         ADDR_CLASS,
  73         __ADDR_MAX
  74 };
  75
  76 static const struct blobmsg_policy proto_ip_addr[__ADDR_MAX] = {
  77         [ADDR_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING },
  78         [ADDR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_STRING },
  79         [ADDR_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  80         [ADDR_PTP] = { .name = "ptp", .type = BLOBMSG_TYPE_STRING },
  81         [ADDR_PREFERRED] = { .name = "preferred", .type = BLOBMSG_TYPE_INT32 },
  82         [ADDR_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  83         [ADDR_OFFLINK] = { .name = "offlink", .type = BLOBMSG_TYPE_BOOL },
  84         [ADDR_CLASS] = { .name = "class", .type = BLOBMSG_TYPE_STRING },
  85 };
  86
  87 static struct device_addr *
  88 alloc_device_addr(bool v6, bool ext)
  89 {
  90         struct device_addr *addr;
  91
  92         addr = calloc(1, sizeof(*addr));
  93         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
  94         if (ext)
  95                 addr->flags |= DEVADDR_EXTERNAL;
  96
  97         return addr;
  98 }
  99
 100 static bool
 101 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
 102            bool ext, uint32_t broadcast)
 103 {
 104         struct device_addr *addr;
 105         int af = v6 ? AF_INET6 : AF_INET;
 106
 107         addr = alloc_device_addr(v6, ext);
 108         if (!addr)
 109                 return false;
 110
 111         addr->mask = mask;
 112         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
 113                 interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 114                 free(addr);
 115                 return false;
 116         }
 117
 118         if (broadcast)
 119                 addr->broadcast = broadcast;
 120
 121         vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 122         return true;
 123 }
 124
 125 static int
 126 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 127                             bool v6, int netmask, bool ext, uint32_t broadcast)
 128 {
 129         struct blob_attr *cur;
 130         int n_addr = 0;
 131         int rem;
 132
 133         blobmsg_for_each_attr(cur, attr, rem) {
 134                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 135                         return -1;
 136
 137                 n_addr++;
 138                 if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
 139                                 broadcast))
 140                         return -1;
 141         }
 142
 143         return n_addr;
 144 }
 145
 146 static struct device_addr *
 147 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 148 {
 149         struct device_addr *addr;
 150         struct blob_attr *tb[__ADDR_MAX];
 151         struct blob_attr *cur;
 152
 153         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 154                 return NULL;
 155
 156         addr = alloc_device_addr(v6, ext);
 157         if (!addr)
 158                 return NULL;
 159
 160         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 161
 162         addr->mask = v6 ? 128 : 32;
 163         if ((cur = tb[ADDR_MASK])) {
 164                 unsigned int new_mask;
 165
 166                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 167                 if (new_mask > addr->mask)
 168                         goto error;
 169
 170                 addr->mask = new_mask;
 171         }
 172
 173         cur = tb[ADDR_IPADDR];
 174         if (!cur)
 175                 goto error;
 176
 177         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 178                 goto error;
 179
 180         if ((cur = tb[ADDR_OFFLINK]) && blobmsg_get_bool(cur))
 181                 addr->flags |= DEVADDR_OFFLINK;
 182
 183         if (!v6) {
 184                 if ((cur = tb[ADDR_BROADCAST]) &&
 185                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 186                         goto error;
 187                 if ((cur = tb[ADDR_PTP]) &&
 188                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 189                         goto error;
 190         } else {
 191                 time_t now = system_get_rtime();
 192                 if ((cur = tb[ADDR_PREFERRED])) {
 193                         int64_t preferred = blobmsg_get_u32(cur);
 194                         int64_t preferred_until = preferred + (int64_t)now;
 195                         if (preferred_until <= LONG_MAX && preferred != 0xffffffffLL)
 196                                 addr->preferred_until = preferred_until;
 197                 }
 198
 199                 if ((cur = tb[ADDR_VALID])) {
 200                         int64_t valid = blobmsg_get_u32(cur);
 201                         int64_t valid_until = valid + (int64_t)now;
 202                         if (valid_until <= LONG_MAX && valid != 0xffffffffLL)
 203                                 addr->valid_until = valid_until;
 204
 205                 }
 206
 207                 if (addr->valid_until) {
 208                         if (!addr->preferred_until)
 209                                 addr->preferred_until = addr->valid_until;
 210                         else if (addr->preferred_until > addr->valid_until)
 211                                 goto error;
 212                 }
 213
 214                 if ((cur = tb[ADDR_CLASS]))
 215                         addr->pclass = strdup(blobmsg_get_string(cur));
 216         }
 217
 218         return addr;
 219
 220 error:
 221         free(addr);
 222         return NULL;
 223 }
 224
 225 static int
 226 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 227                    bool ext)
 228 {
 229         struct device_addr *addr;
 230         struct blob_attr *cur;
 231         int n_addr = 0;
 232         int rem;
 233
 234         blobmsg_for_each_attr(cur, attr, rem) {
 235                 addr = parse_address_item(cur, v6, ext);
 236                 if (!addr)
 237                         return -1;
 238
 239                 n_addr++;
 240                 vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 241         }
 242
 243         return n_addr;
 244 }
 245
 246 static bool
 247 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 248 {
 249         struct device_route *route;
 250         const char *str = blobmsg_data(attr);
 251         int af = v6 ? AF_INET6 : AF_INET;
 252
 253         route = calloc(1, sizeof(*route));
 254         if (!inet_pton(af, str, &route->nexthop)) {
 255                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 256                 free(route);
 257                 return false;
 258         }
 259
 260         route->mask = 0;
 261         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 262
 263         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 264         if (table) {
 265                 route->table = table;
 266                 route->flags |= DEVROUTE_SRCTABLE;
 267         }
 268
 269         vlist_add(&iface->proto_ip.route, &route->node, route);
 270
 271         return true;
 272 }
 273
 274 static bool
 275 parse_prefix_option(struct interface *iface, const char *str, size_t len)
 276 {
 277         char buf[128] = {0}, *saveptr;
 278         if (len > sizeof(buf))
 279                 return false;
 280
 281         memcpy(buf, str, len);
 282         char *addrstr = strtok_r(buf, "/", &saveptr);
 283         if (!addrstr)
 284                 return false;
 285
 286         char *lengthstr = strtok_r(NULL, ",", &saveptr);
 287         if (!lengthstr)
 288                 return false;
 289
 290         char *prefstr = strtok_r(NULL, ",", &saveptr);
 291         char *validstr = (!prefstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 292         char *addstr = (!validstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 293         const char *pclass = NULL;
 294
 295         int64_t pref = (!prefstr) ? 0 : strtoul(prefstr, NULL, 10);
 296         int64_t valid = (!validstr) ? 0 : strtoul(validstr, NULL, 10);
 297
 298         uint8_t length = strtoul(lengthstr, NULL, 10), excl_length = 0;
 299         if (length < 1 || length > 64)
 300                 return false;
 301
 302         struct in6_addr addr, excluded, *excludedp = NULL;
 303         if (inet_pton(AF_INET6, addrstr, &addr) < 1)
 304                 return false;
 305
 306         for (; addstr; addstr = strtok_r(NULL, ",", &saveptr)) {
 307                 char *key = NULL, *val = NULL, *addsaveptr;
 308                 if (!(key = strtok_r(addstr, "=", &addsaveptr)) ||
 309                                 !(val = strtok_r(NULL, ",", &addsaveptr)))
 310                         continue;
 311
 312                 if (!strcmp(key, "excluded")) {
 313                         char *sep = strchr(val, '/');
 314                         if (!sep)
 315                                 return false;
 316
 317                         *sep = 0;
 318                         excl_length = atoi(sep + 1);
 319
 320                         if (inet_pton(AF_INET6, val, &excluded) < 1)
 321                                 return false;
 322
 323                         excludedp = &excluded;
 324                 } else if (!strcmp(key, "class")) {
 325                         pclass = val;
 326                 }
 327
 328         }
 329
 330
 331
 332
 333         int64_t now = system_get_rtime();
 334         time_t preferred_until = 0;
 335         if (prefstr && pref != 0xffffffffLL && pref + now <= LONG_MAX)
 336                 preferred_until = pref + now;
 337
 338         time_t valid_until = 0;
 339         if (validstr && valid != 0xffffffffLL && valid + now <= LONG_MAX)
 340                 valid_until = valid + now;
 341
 342         interface_ip_add_device_prefix(iface, &addr, length,
 343                         valid_until, preferred_until,
 344                         excludedp, excl_length, pclass);
 345         return true;
 346 }
 347
 348 static int
 349 parse_prefix_list(struct interface *iface, struct blob_attr *attr)
 350 {
 351         struct blob_attr *cur;
 352         int n_addr = 0;
 353         int rem;
 354
 355         blobmsg_for_each_attr(cur, attr, rem) {
 356                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 357                         return -1;
 358
 359                 n_addr++;
 360                 if (!parse_prefix_option(iface, blobmsg_data(cur),
 361                                 blobmsg_data_len(cur)))
 362                         return -1;
 363         }
 364
 365         return n_addr;
 366 }
 367
 368 int
 369 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 370 {
 371         struct blob_attr *tb[__OPT_MAX];
 372         struct blob_attr *cur;
 373         const char *error;
 374         unsigned int netmask = 32;
 375         int n_v4 = 0, n_v6 = 0;
 376         struct in_addr bcast = {};
 377
 378         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 379
 380         if ((cur = tb[OPT_NETMASK])) {
 381                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 382                 if (netmask > 32) {
 383                         error = "INVALID_NETMASK";
 384                         goto error;
 385                 }
 386         }
 387
 388         if ((cur = tb[OPT_BROADCAST])) {
 389                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 390                         error = "INVALID_BROADCAST";
 391                         goto error;
 392                 }
 393         }
 394
 395         if ((cur = tb[OPT_IPADDR]))
 396                 n_v4 = parse_static_address_option(iface, cur, false,
 397                         netmask, false, bcast.s_addr);
 398
 399         if ((cur = tb[OPT_IP6ADDR]))
 400                 n_v6 = parse_static_address_option(iface, cur, true,
 401                         128, false, 0);
 402
 403         if ((cur = tb[OPT_IP6PREFIX]))
 404                 if (parse_prefix_list(iface, cur) < 0)
 405                         goto out;
 406
 407         if (n_v4 < 0 || n_v6 < 0)
 408                 goto out;
 409
 410         if ((cur = tb[OPT_GATEWAY])) {
 411                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 412                         goto out;
 413         }
 414
 415         if ((cur = tb[OPT_IP6GW])) {
 416                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 417                         goto out;
 418         }
 419
 420         return 0;
 421
 422 error:
 423         interface_add_error(iface, "proto", error, NULL, 0);
 424 out:
 425         return -1;
 426 }
 427
 428 int
 429 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 430 {
 431         struct blob_attr *tb[__OPT_MAX];
 432         struct blob_attr *cur;
 433         int n_v4 = 0, n_v6 = 0;
 434
 435         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 436
 437         if ((cur = tb[OPT_IPADDR]))
 438                 n_v4 = parse_address_list(iface, cur, false, ext);
 439
 440         if ((cur = tb[OPT_IP6ADDR]))
 441                 n_v6 = parse_address_list(iface, cur, true, ext);
 442
 443         if ((cur = tb[OPT_IP6PREFIX]))
 444                 if (parse_prefix_list(iface, cur) < 0)
 445                         goto out;
 446
 447         if (n_v4 < 0 || n_v6 < 0)
 448                 goto out;
 449
 450         if ((cur = tb[OPT_GATEWAY])) {
 451                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 452                         goto out;
 453         }
 454
 455         if ((cur = tb[OPT_IP6GW])) {
 456                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 457                         goto out;
 458         }
 459
 460         return 0;
 461
 462 out:
 463         return -1;
 464 }
 465
 466 void add_proto_handler(struct proto_handler *p)
 467 {
 468         if (!handlers.comp)
 469                 avl_init(&handlers, avl_strcmp, false, NULL);
 470
 471         if (p->avl.key)
 472                 return;
 473
 474         p->avl.key = p->name;
 475         avl_insert(&handlers, &p->avl);
 476 }
 477
 478 static void
 479 default_proto_free(struct interface_proto_state *proto)
 480 {
 481         free(proto);
 482 }
 483
 484 static int
 485 invalid_proto_handler(struct interface_proto_state *proto,
 486                       enum interface_proto_cmd cmd, bool force)
 487 {
 488         return -1;
 489 }
 490
 491 static int
 492 no_proto_handler(struct interface_proto_state *proto,
 493                  enum interface_proto_cmd cmd, bool force)
 494 {
 495         return 0;
 496 }
 497
 498 static struct interface_proto_state *
 499 default_proto_attach(const struct proto_handler *h,
 500                      struct interface *iface, struct blob_attr *attr)
 501 {
 502         struct interface_proto_state *proto;
 503
 504         proto = calloc(1, sizeof(*proto));
 505         proto->free = default_proto_free;
 506         proto->cb = no_proto_handler;
 507
 508         return proto;
 509 }
 510
 511 static const struct proto_handler no_proto = {
 512         .name = "none",
 513         .flags = PROTO_FLAG_IMMEDIATE,
 514         .attach = default_proto_attach,
 515 };
 516
 517 static const struct proto_handler *
 518 get_proto_handler(const char *name)
 519 {
 520         struct proto_handler *proto;
 521
 522         if (!strcmp(name, "none"))
 523             return &no_proto;
 524
 525         if (!handlers.comp)
 526                 return NULL;
 527
 528         return avl_find_element(&handlers, name, proto, avl);
 529 }
 530
 531 void
 532 proto_dump_handlers(struct blob_buf *b)
 533 {
 534         struct proto_handler *p;
 535         void *c;
 536
 537         avl_for_each_element(&handlers, p, avl) {
 538                 void *v;
 539
 540                 c = blobmsg_open_table(b, p->name);
 541                 if (p->config_params->validate) {
 542                         int i;
 543
 544                         v = blobmsg_open_table(b, "validate");
 545                         for (i = 0; i < p->config_params->n_params; i++)
 546                                 blobmsg_add_string(b, p->config_params->params[i].name, uci_get_validate_string(p->config_params, i));
 547                         blobmsg_close_table(b, v);
 548                 }
 549                 blobmsg_add_u8(b, "no_device", !!(p->flags & PROTO_FLAG_NODEV));
 550                 blobmsg_close_table(b, c);
 551         }
 552 }
 553
 554 void
 555 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 556 {
 557         const struct proto_handler *proto = iface->proto_handler;
 558         struct interface_proto_state *state = NULL;
 559
 560         if (!proto)
 561                 proto = &no_proto;
 562
 563         state = proto->attach(proto, iface, attr);
 564         if (!state) {
 565                 state = no_proto.attach(&no_proto, iface, attr);
 566                 state->cb = invalid_proto_handler;
 567         }
 568
 569         state->handler = proto;
 570         interface_set_proto_state(iface, state);
 571 }
 572
 573 void
 574 proto_attach_interface(struct interface *iface, const char *proto_name)
 575 {
 576         const struct proto_handler *proto = &no_proto;
 577
 578         if (proto_name) {
 579                 proto = get_proto_handler(proto_name);
 580                 if (!proto) {
 581                         interface_add_error(iface, "proto", "INVALID_PROTO", NULL, 0);
 582                         proto = &no_proto;
 583                 }
 584         }
 585
 586         iface->proto_handler = proto;
 587 }
 588
 589 int
 590 interface_proto_event(struct interface_proto_state *proto,
 591                       enum interface_proto_cmd cmd, bool force)
 592 {
 593         enum interface_proto_event ev;
 594         int ret;
 595
 596         ret = proto->cb(proto, cmd, force);
 597         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 598                 goto out;
 599
 600         switch(cmd) {
 601         case PROTO_CMD_SETUP:
 602                 ev = IFPEV_UP;
 603                 break;
 604         case PROTO_CMD_TEARDOWN:
 605                 ev = IFPEV_DOWN;
 606                 break;
 607         default:
 608                 return -EINVAL;
 609         }
 610         proto->proto_event(proto, ev);
 611
 612 out:
 613         return ret;
 614 }