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 static const char * const proto_ip_validate[__OPT_MAX] = {
  59         [OPT_IPADDR] = "ip4addr",
  60         [OPT_IP6ADDR] = "ip6addr",
  61         [OPT_NETMASK] = "netmask",
  62         [OPT_BROADCAST] = "ipaddr",
  63         [OPT_GATEWAY] = "ip4addr",
  64         [OPT_IP6GW] = "ip6addr",
  65         [OPT_IP6PREFIX] = "ip6addr",
  66 };
  67
  68 const struct uci_blob_param_list proto_ip_attr = {
  69         .n_params = __OPT_MAX,
  70         .params = proto_ip_attributes,
  71         .validate = proto_ip_validate,
  72         .info = proto_ip_attr_info,
  73 };
  74
  75 enum {
  76         ADDR_IPADDR,
  77         ADDR_MASK,
  78         ADDR_BROADCAST,
  79         ADDR_PTP,
  80         ADDR_PREFERRED,
  81         ADDR_VALID,
  82         ADDR_OFFLINK,
  83         ADDR_CLASS,
  84         __ADDR_MAX
  85 };
  86
  87 static const struct blobmsg_policy proto_ip_addr[__ADDR_MAX] = {
  88         [ADDR_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_STRING },
  89         [ADDR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_STRING },
  90         [ADDR_BROADCAST] = { .name = "broadcast", .type = BLOBMSG_TYPE_STRING },
  91         [ADDR_PTP] = { .name = "ptp", .type = BLOBMSG_TYPE_STRING },
  92         [ADDR_PREFERRED] = { .name = "preferred", .type = BLOBMSG_TYPE_INT32 },
  93         [ADDR_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
  94         [ADDR_OFFLINK] = { .name = "offlink", .type = BLOBMSG_TYPE_BOOL },
  95         [ADDR_CLASS] = { .name = "class", .type = BLOBMSG_TYPE_STRING },
  96 };
  97
  98 static struct device_addr *
  99 alloc_device_addr(bool v6, bool ext)
 100 {
 101         struct device_addr *addr;
 102
 103         addr = calloc(1, sizeof(*addr));
 104         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
 105         if (ext)
 106                 addr->flags |= DEVADDR_EXTERNAL;
 107
 108         return addr;
 109 }
 110
 111 static bool
 112 parse_addr(struct interface *iface, const char *str, bool v6, int mask,
 113            bool ext, uint32_t broadcast)
 114 {
 115         struct device_addr *addr;
 116         int af = v6 ? AF_INET6 : AF_INET;
 117
 118         addr = alloc_device_addr(v6, ext);
 119         if (!addr)
 120                 return false;
 121
 122         addr->mask = mask;
 123         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
 124                 interface_add_error(iface, "proto", "INVALID_ADDRESS", &str, 1);
 125                 free(addr);
 126                 return false;
 127         }
 128
 129         if (broadcast)
 130                 addr->broadcast = broadcast;
 131
 132         vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 133         return true;
 134 }
 135
 136 static int
 137 parse_static_address_option(struct interface *iface, struct blob_attr *attr,
 138                             bool v6, int netmask, bool ext, uint32_t broadcast)
 139 {
 140         struct blob_attr *cur;
 141         int n_addr = 0;
 142         int rem;
 143
 144         blobmsg_for_each_attr(cur, attr, rem) {
 145                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 146                         return -1;
 147
 148                 n_addr++;
 149                 if (!parse_addr(iface, blobmsg_data(cur), v6, netmask, ext,
 150                                 broadcast))
 151                         return -1;
 152         }
 153
 154         return n_addr;
 155 }
 156
 157 static struct device_addr *
 158 parse_address_item(struct blob_attr *attr, bool v6, bool ext)
 159 {
 160         struct device_addr *addr;
 161         struct blob_attr *tb[__ADDR_MAX];
 162         struct blob_attr *cur;
 163
 164         if (blobmsg_type(attr) != BLOBMSG_TYPE_TABLE)
 165                 return NULL;
 166
 167         addr = alloc_device_addr(v6, ext);
 168         if (!addr)
 169                 return NULL;
 170
 171         blobmsg_parse(proto_ip_addr, __ADDR_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 172
 173         addr->mask = v6 ? 128 : 32;
 174         if ((cur = tb[ADDR_MASK])) {
 175                 unsigned int new_mask;
 176
 177                 new_mask = parse_netmask_string(blobmsg_data(cur), v6);
 178                 if (new_mask > addr->mask)
 179                         goto error;
 180
 181                 addr->mask = new_mask;
 182         }
 183
 184         cur = tb[ADDR_IPADDR];
 185         if (!cur)
 186                 goto error;
 187
 188         if (!inet_pton(v6 ? AF_INET6 : AF_INET, blobmsg_data(cur), &addr->addr))
 189                 goto error;
 190
 191         if ((cur = tb[ADDR_OFFLINK]) && blobmsg_get_bool(cur))
 192                 addr->flags |= DEVADDR_OFFLINK;
 193
 194         if (!v6) {
 195                 if ((cur = tb[ADDR_BROADCAST]) &&
 196                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->broadcast))
 197                         goto error;
 198                 if ((cur = tb[ADDR_PTP]) &&
 199                     !inet_pton(AF_INET, blobmsg_data(cur), &addr->point_to_point))
 200                         goto error;
 201         } else {
 202                 time_t now = system_get_rtime();
 203                 if ((cur = tb[ADDR_PREFERRED])) {
 204                         int64_t preferred = blobmsg_get_u32(cur);
 205                         int64_t preferred_until = preferred + (int64_t)now;
 206                         if (preferred_until <= LONG_MAX && preferred != 0xffffffffLL)
 207                                 addr->preferred_until = preferred_until;
 208                 }
 209
 210                 if ((cur = tb[ADDR_VALID])) {
 211                         int64_t valid = blobmsg_get_u32(cur);
 212                         int64_t valid_until = valid + (int64_t)now;
 213                         if (valid_until <= LONG_MAX && valid != 0xffffffffLL)
 214                                 addr->valid_until = valid_until;
 215
 216                 }
 217
 218                 if (addr->valid_until) {
 219                         if (!addr->preferred_until)
 220                                 addr->preferred_until = addr->valid_until;
 221                         else if (addr->preferred_until > addr->valid_until)
 222                                 goto error;
 223                 }
 224
 225                 if ((cur = tb[ADDR_CLASS]))
 226                         addr->pclass = strdup(blobmsg_get_string(cur));
 227         }
 228
 229         return addr;
 230
 231 error:
 232         free(addr);
 233         return NULL;
 234 }
 235
 236 static int
 237 parse_address_list(struct interface *iface, struct blob_attr *attr, bool v6,
 238                    bool ext)
 239 {
 240         struct device_addr *addr;
 241         struct blob_attr *cur;
 242         int n_addr = 0;
 243         int rem;
 244
 245         blobmsg_for_each_attr(cur, attr, rem) {
 246                 addr = parse_address_item(cur, v6, ext);
 247                 if (!addr)
 248                         return -1;
 249
 250                 n_addr++;
 251                 vlist_add(&iface->proto_ip.addr, &addr->node, &addr->flags);
 252         }
 253
 254         return n_addr;
 255 }
 256
 257 static bool
 258 parse_gateway_option(struct interface *iface, struct blob_attr *attr, bool v6)
 259 {
 260         struct device_route *route;
 261         const char *str = blobmsg_data(attr);
 262         int af = v6 ? AF_INET6 : AF_INET;
 263
 264         route = calloc(1, sizeof(*route));
 265         if (!inet_pton(af, str, &route->nexthop)) {
 266                 interface_add_error(iface, "proto", "INVALID_GATEWAY", &str, 1);
 267                 free(route);
 268                 return false;
 269         }
 270
 271         route->mask = 0;
 272         route->flags = (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 273         route->metric = iface->metric;
 274
 275         unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
 276         if (table) {
 277                 route->table = table;
 278                 route->flags |= DEVROUTE_SRCTABLE;
 279         }
 280
 281         vlist_add(&iface->proto_ip.route, &route->node, route);
 282
 283         return true;
 284 }
 285
 286 static bool
 287 parse_prefix_option(struct interface *iface, const char *str, size_t len)
 288 {
 289         char buf[128] = {0}, *saveptr;
 290         if (len > sizeof(buf))
 291                 return false;
 292
 293         memcpy(buf, str, len);
 294         char *addrstr = strtok_r(buf, "/", &saveptr);
 295         if (!addrstr)
 296                 return false;
 297
 298         char *lengthstr = strtok_r(NULL, ",", &saveptr);
 299         if (!lengthstr)
 300                 return false;
 301
 302         char *prefstr = strtok_r(NULL, ",", &saveptr);
 303         char *validstr = (!prefstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 304         char *addstr = (!validstr) ? NULL : strtok_r(NULL, ",", &saveptr);
 305         const char *pclass = NULL;
 306
 307         int64_t pref = (!prefstr) ? 0 : strtoul(prefstr, NULL, 10);
 308         int64_t valid = (!validstr) ? 0 : strtoul(validstr, NULL, 10);
 309
 310         uint8_t length = strtoul(lengthstr, NULL, 10), excl_length = 0;
 311         if (length < 1 || length > 64)
 312                 return false;
 313
 314         struct in6_addr addr, excluded, *excludedp = NULL;
 315         if (inet_pton(AF_INET6, addrstr, &addr) < 1)
 316                 return false;
 317
 318         for (; addstr; addstr = strtok_r(NULL, ",", &saveptr)) {
 319                 char *key = NULL, *val = NULL, *addsaveptr;
 320                 if (!(key = strtok_r(addstr, "=", &addsaveptr)) ||
 321                                 !(val = strtok_r(NULL, ",", &addsaveptr)))
 322                         continue;
 323
 324                 if (!strcmp(key, "excluded")) {
 325                         char *sep = strchr(val, '/');
 326                         if (!sep)
 327                                 return false;
 328
 329                         *sep = 0;
 330                         excl_length = atoi(sep + 1);
 331
 332                         if (inet_pton(AF_INET6, val, &excluded) < 1)
 333                                 return false;
 334
 335                         excludedp = &excluded;
 336                 } else if (!strcmp(key, "class")) {
 337                         pclass = val;
 338                 }
 339
 340         }
 341
 342
 343
 344
 345         int64_t now = system_get_rtime();
 346         time_t preferred_until = 0;
 347         if (prefstr && pref != 0xffffffffLL && pref + now <= LONG_MAX)
 348                 preferred_until = pref + now;
 349
 350         time_t valid_until = 0;
 351         if (validstr && valid != 0xffffffffLL && valid + now <= LONG_MAX)
 352                 valid_until = valid + now;
 353
 354         interface_ip_add_device_prefix(iface, &addr, length,
 355                         valid_until, preferred_until,
 356                         excludedp, excl_length, pclass);
 357         return true;
 358 }
 359
 360 static int
 361 parse_prefix_list(struct interface *iface, struct blob_attr *attr)
 362 {
 363         struct blob_attr *cur;
 364         int n_addr = 0;
 365         int rem;
 366
 367         blobmsg_for_each_attr(cur, attr, rem) {
 368                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 369                         return -1;
 370
 371                 n_addr++;
 372                 if (!parse_prefix_option(iface, blobmsg_data(cur),
 373                                 blobmsg_data_len(cur)))
 374                         return -1;
 375         }
 376
 377         return n_addr;
 378 }
 379
 380 int
 381 proto_apply_static_ip_settings(struct interface *iface, struct blob_attr *attr)
 382 {
 383         struct blob_attr *tb[__OPT_MAX];
 384         struct blob_attr *cur;
 385         const char *error;
 386         unsigned int netmask = 32;
 387         int n_v4 = 0, n_v6 = 0;
 388         struct in_addr bcast = {};
 389
 390         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 391
 392         if ((cur = tb[OPT_NETMASK])) {
 393                 netmask = parse_netmask_string(blobmsg_data(cur), false);
 394                 if (netmask > 32) {
 395                         error = "INVALID_NETMASK";
 396                         goto error;
 397                 }
 398         }
 399
 400         if ((cur = tb[OPT_BROADCAST])) {
 401                 if (!inet_pton(AF_INET, blobmsg_data(cur), &bcast)) {
 402                         error = "INVALID_BROADCAST";
 403                         goto error;
 404                 }
 405         }
 406
 407         if ((cur = tb[OPT_IPADDR]))
 408                 n_v4 = parse_static_address_option(iface, cur, false,
 409                         netmask, false, bcast.s_addr);
 410
 411         if ((cur = tb[OPT_IP6ADDR]))
 412                 n_v6 = parse_static_address_option(iface, cur, true,
 413                         128, false, 0);
 414
 415         if ((cur = tb[OPT_IP6PREFIX]))
 416                 if (parse_prefix_list(iface, cur) < 0)
 417                         goto out;
 418
 419         if (n_v4 < 0 || n_v6 < 0)
 420                 goto out;
 421
 422         if ((cur = tb[OPT_GATEWAY])) {
 423                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 424                         goto out;
 425         }
 426
 427         if ((cur = tb[OPT_IP6GW])) {
 428                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 429                         goto out;
 430         }
 431
 432         return 0;
 433
 434 error:
 435         interface_add_error(iface, "proto", error, NULL, 0);
 436 out:
 437         return -1;
 438 }
 439
 440 int
 441 proto_apply_ip_settings(struct interface *iface, struct blob_attr *attr, bool ext)
 442 {
 443         struct blob_attr *tb[__OPT_MAX];
 444         struct blob_attr *cur;
 445         int n_v4 = 0, n_v6 = 0;
 446
 447         blobmsg_parse(proto_ip_attributes, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 448
 449         if ((cur = tb[OPT_IPADDR]))
 450                 n_v4 = parse_address_list(iface, cur, false, ext);
 451
 452         if ((cur = tb[OPT_IP6ADDR]))
 453                 n_v6 = parse_address_list(iface, cur, true, ext);
 454
 455         if ((cur = tb[OPT_IP6PREFIX]))
 456                 if (parse_prefix_list(iface, cur) < 0)
 457                         goto out;
 458
 459         if (n_v4 < 0 || n_v6 < 0)
 460                 goto out;
 461
 462         if ((cur = tb[OPT_GATEWAY])) {
 463                 if (n_v4 && !parse_gateway_option(iface, cur, false))
 464                         goto out;
 465         }
 466
 467         if ((cur = tb[OPT_IP6GW])) {
 468                 if (n_v6 && !parse_gateway_option(iface, cur, true))
 469                         goto out;
 470         }
 471
 472         return 0;
 473
 474 out:
 475         return -1;
 476 }
 477
 478 void add_proto_handler(struct proto_handler *p)
 479 {
 480         if (!handlers.comp)
 481                 avl_init(&handlers, avl_strcmp, false, NULL);
 482
 483         if (p->avl.key)
 484                 return;
 485
 486         p->avl.key = p->name;
 487         avl_insert(&handlers, &p->avl);
 488 }
 489
 490 static void
 491 default_proto_free(struct interface_proto_state *proto)
 492 {
 493         free(proto);
 494 }
 495
 496 static int
 497 invalid_proto_handler(struct interface_proto_state *proto,
 498                       enum interface_proto_cmd cmd, bool force)
 499 {
 500         return -1;
 501 }
 502
 503 static int
 504 no_proto_handler(struct interface_proto_state *proto,
 505                  enum interface_proto_cmd cmd, bool force)
 506 {
 507         return 0;
 508 }
 509
 510 static struct interface_proto_state *
 511 default_proto_attach(const struct proto_handler *h,
 512                      struct interface *iface, struct blob_attr *attr)
 513 {
 514         struct interface_proto_state *proto;
 515
 516         proto = calloc(1, sizeof(*proto));
 517         proto->free = default_proto_free;
 518         proto->cb = no_proto_handler;
 519
 520         return proto;
 521 }
 522
 523 static const struct proto_handler no_proto = {
 524         .name = "none",
 525         .flags = PROTO_FLAG_IMMEDIATE,
 526         .attach = default_proto_attach,
 527 };
 528
 529 static const struct proto_handler *
 530 get_proto_handler(const char *name)
 531 {
 532         struct proto_handler *proto;
 533
 534         if (!strcmp(name, "none"))
 535             return &no_proto;
 536
 537         if (!handlers.comp)
 538                 return NULL;
 539
 540         return avl_find_element(&handlers, name, proto, avl);
 541 }
 542
 543 void
 544 proto_dump_handlers(struct blob_buf *b)
 545 {
 546         struct proto_handler *p;
 547         void *c;
 548
 549         avl_for_each_element(&handlers, p, avl) {
 550                 void *v;
 551
 552                 c = blobmsg_open_table(b, p->name);
 553                 if (p->config_params->validate) {
 554                         int i;
 555
 556                         v = blobmsg_open_table(b, "validate");
 557                         for (i = 0; i < p->config_params->n_params; i++)
 558                                 blobmsg_add_string(b, p->config_params->params[i].name, uci_get_validate_string(p->config_params, i));
 559                         blobmsg_close_table(b, v);
 560                 }
 561                 blobmsg_add_u8(b, "no_device", !!(p->flags & PROTO_FLAG_NODEV));
 562                 blobmsg_close_table(b, c);
 563         }
 564 }
 565
 566 void
 567 proto_init_interface(struct interface *iface, struct blob_attr *attr)
 568 {
 569         const struct proto_handler *proto = iface->proto_handler;
 570         struct interface_proto_state *state = NULL;
 571
 572         if (!proto)
 573                 proto = &no_proto;
 574
 575         state = proto->attach(proto, iface, attr);
 576         if (!state) {
 577                 state = no_proto.attach(&no_proto, iface, attr);
 578                 state->cb = invalid_proto_handler;
 579         }
 580
 581         state->handler = proto;
 582         interface_set_proto_state(iface, state);
 583 }
 584
 585 void
 586 proto_attach_interface(struct interface *iface, const char *proto_name)
 587 {
 588         const struct proto_handler *proto = &no_proto;
 589         const char *error = NULL;
 590
 591         if (proto_name) {
 592                 proto = get_proto_handler(proto_name);
 593                 if (!proto) {
 594                         error = "INVALID_PROTO";
 595                         proto = &no_proto;
 596                 }
 597         }
 598
 599         iface->proto_handler = proto;
 600
 601         if (error)
 602                 interface_add_error(iface, "proto", error, NULL, 0);
 603 }
 604
 605 int
 606 interface_proto_event(struct interface_proto_state *proto,
 607                       enum interface_proto_cmd cmd, bool force)
 608 {
 609         enum interface_proto_event ev;
 610         int ret;
 611
 612         ret = proto->cb(proto, cmd, force);
 613         if (ret || !(proto->handler->flags & PROTO_FLAG_IMMEDIATE))
 614                 goto out;
 615
 616         switch(cmd) {
 617         case PROTO_CMD_SETUP:
 618                 ev = IFPEV_UP;
 619                 break;
 620         case PROTO_CMD_TEARDOWN:
 621                 ev = IFPEV_DOWN;
 622                 break;
 623         case PROTO_CMD_RENEW:
 624                 ev = IFPEV_RENEW;
 625                 break;
 626         default:
 627                 return -EINVAL;
 628         }
 629         proto->proto_event(proto, ev);
 630
 631 out:
 632         return ret;
 633 }