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