route_obj.c revision 7072675b40b611279466756ef800cc5dbee92c54
1/* 2 * lib/route/route_obj.c Route Object 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> 10 */ 11 12/** 13 * @ingroup route 14 * @defgroup route_obj Route Object 15 * 16 * @par Attributes 17 * @code 18 * Name Default 19 * ------------------------------------------------------------- 20 * routing table RT_TABLE_MAIN 21 * scope RT_SCOPE_NOWHERE 22 * tos 0 23 * protocol RTPROT_STATIC 24 * prio 0 25 * family AF_UNSPEC 26 * type RTN_UNICAST 27 * iif NULL 28 * @endcode 29 * 30 * @{ 31 */ 32 33#include <netlink-local.h> 34#include <netlink/netlink.h> 35#include <netlink/cache.h> 36#include <netlink/utils.h> 37#include <netlink/data.h> 38#include <netlink/route/rtnl.h> 39#include <netlink/route/route.h> 40#include <netlink/route/link.h> 41#include <netlink/route/nexthop.h> 42 43/** @cond SKIP */ 44#define ROUTE_ATTR_FAMILY 0x000001 45#define ROUTE_ATTR_TOS 0x000002 46#define ROUTE_ATTR_TABLE 0x000004 47#define ROUTE_ATTR_PROTOCOL 0x000008 48#define ROUTE_ATTR_SCOPE 0x000010 49#define ROUTE_ATTR_TYPE 0x000020 50#define ROUTE_ATTR_FLAGS 0x000040 51#define ROUTE_ATTR_DST 0x000080 52#define ROUTE_ATTR_SRC 0x000100 53#define ROUTE_ATTR_IIF 0x000200 54#define ROUTE_ATTR_OIF 0x000400 55#define ROUTE_ATTR_GATEWAY 0x000800 56#define ROUTE_ATTR_PRIO 0x001000 57#define ROUTE_ATTR_PREF_SRC 0x002000 58#define ROUTE_ATTR_METRICS 0x004000 59#define ROUTE_ATTR_MULTIPATH 0x008000 60#define ROUTE_ATTR_REALMS 0x010000 61#define ROUTE_ATTR_CACHEINFO 0x020000 62/** @endcond */ 63 64static void route_constructor(struct nl_object *c) 65{ 66 struct rtnl_route *r = (struct rtnl_route *) c; 67 68 r->rt_family = AF_UNSPEC; 69 r->rt_scope = RT_SCOPE_NOWHERE; 70 r->rt_table = RT_TABLE_MAIN; 71 r->rt_protocol = RTPROT_STATIC; 72 r->rt_type = RTN_UNICAST; 73 74 nl_init_list_head(&r->rt_nexthops); 75} 76 77static void route_free_data(struct nl_object *c) 78{ 79 struct rtnl_route *r = (struct rtnl_route *) c; 80 struct rtnl_nexthop *nh, *tmp; 81 82 if (r == NULL) 83 return; 84 85 nl_addr_put(r->rt_dst); 86 nl_addr_put(r->rt_src); 87 nl_addr_put(r->rt_pref_src); 88 89 nl_list_for_each_entry_safe(nh, tmp, &r->rt_nexthops, rtnh_list) { 90 rtnl_route_remove_nexthop(r, nh); 91 rtnl_route_nh_free(nh); 92 } 93} 94 95static int route_clone(struct nl_object *_dst, struct nl_object *_src) 96{ 97 struct rtnl_route *dst = (struct rtnl_route *) _dst; 98 struct rtnl_route *src = (struct rtnl_route *) _src; 99 struct rtnl_nexthop *nh, *new; 100 101 if (src->rt_dst) 102 if (!(dst->rt_dst = nl_addr_clone(src->rt_dst))) 103 return -NLE_NOMEM; 104 105 if (src->rt_src) 106 if (!(dst->rt_src = nl_addr_clone(src->rt_src))) 107 return -NLE_NOMEM; 108 109 if (src->rt_pref_src) 110 if (!(dst->rt_pref_src = nl_addr_clone(src->rt_pref_src))) 111 return -NLE_NOMEM; 112 113 nl_init_list_head(&dst->rt_nexthops); 114 nl_list_for_each_entry(nh, &src->rt_nexthops, rtnh_list) { 115 new = rtnl_route_nh_clone(nh); 116 if (!new) 117 return -NLE_NOMEM; 118 119 rtnl_route_add_nexthop(dst, new); 120 } 121 122 return 0; 123} 124 125static void route_dump_line(struct nl_object *a, struct nl_dump_params *p) 126{ 127 struct rtnl_route *r = (struct rtnl_route *) a; 128 struct nl_cache *link_cache; 129 int cache = 0, flags; 130 char buf[64]; 131 132 link_cache = nl_cache_mngt_require("route/link"); 133 134 if (r->rt_flags & RTM_F_CLONED) 135 cache = 1; 136 137 nl_dump_line(p, "%s ", nl_af2str(r->rt_family, buf, sizeof(buf))); 138 139 if (cache) 140 nl_dump(p, "cache "); 141 142 if (!(r->ce_mask & ROUTE_ATTR_DST) || 143 nl_addr_get_len(r->rt_dst) == 0) 144 nl_dump(p, "default "); 145 else 146 nl_dump(p, "%s ", nl_addr2str(r->rt_dst, buf, sizeof(buf))); 147 148 if (r->ce_mask & ROUTE_ATTR_TABLE && !cache) 149 nl_dump(p, "table %s ", 150 rtnl_route_table2str(r->rt_table, buf, sizeof(buf))); 151 152 if (r->ce_mask & ROUTE_ATTR_TYPE) 153 nl_dump(p, "type %s ", 154 nl_rtntype2str(r->rt_type, buf, sizeof(buf))); 155 156 if (r->ce_mask & ROUTE_ATTR_TOS && r->rt_tos != 0) 157 nl_dump(p, "tos %#x ", r->rt_tos); 158 159 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 160 struct rtnl_nexthop *nh; 161 162 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 163 p->dp_ivar = NH_DUMP_FROM_ONELINE; 164 rtnl_route_nh_dump(nh, p); 165 } 166 } 167 168 flags = r->rt_flags & ~(RTM_F_CLONED); 169 if (r->ce_mask & ROUTE_ATTR_FLAGS && flags) { 170 171 nl_dump(p, "<"); 172 173#define PRINT_FLAG(f) if (flags & RTNH_F_##f) { \ 174 flags &= ~RTNH_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 175 PRINT_FLAG(DEAD); 176 PRINT_FLAG(ONLINK); 177 PRINT_FLAG(PERVASIVE); 178#undef PRINT_FLAG 179 180#define PRINT_FLAG(f) if (flags & RTM_F_##f) { \ 181 flags &= ~RTM_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 182 PRINT_FLAG(NOTIFY); 183 PRINT_FLAG(EQUALIZE); 184 PRINT_FLAG(PREFIX); 185#undef PRINT_FLAG 186 187#define PRINT_FLAG(f) if (flags & RTCF_##f) { \ 188 flags &= ~RTCF_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 189 PRINT_FLAG(NOTIFY); 190 PRINT_FLAG(REDIRECTED); 191 PRINT_FLAG(DOREDIRECT); 192 PRINT_FLAG(DIRECTSRC); 193 PRINT_FLAG(DNAT); 194 PRINT_FLAG(BROADCAST); 195 PRINT_FLAG(MULTICAST); 196 PRINT_FLAG(LOCAL); 197#undef PRINT_FLAG 198 199 nl_dump(p, ">"); 200 } 201 202 nl_dump(p, "\n"); 203} 204 205static void route_dump_details(struct nl_object *a, struct nl_dump_params *p) 206{ 207 struct rtnl_route *r = (struct rtnl_route *) a; 208 struct nl_cache *link_cache; 209 char buf[128]; 210 int i; 211 212 link_cache = nl_cache_mngt_require("route/link"); 213 214 route_dump_line(a, p); 215 nl_dump_line(p, " "); 216 217 if (r->ce_mask & ROUTE_ATTR_PREF_SRC) 218 nl_dump(p, "preferred-src %s ", 219 nl_addr2str(r->rt_pref_src, buf, sizeof(buf))); 220 221 if (r->ce_mask & ROUTE_ATTR_SCOPE && r->rt_scope != RT_SCOPE_NOWHERE) 222 nl_dump(p, "scope %s ", 223 rtnl_scope2str(r->rt_scope, buf, sizeof(buf))); 224 225 if (r->ce_mask & ROUTE_ATTR_PRIO) 226 nl_dump(p, "priority %#x ", r->rt_prio); 227 228 if (r->ce_mask & ROUTE_ATTR_PROTOCOL) 229 nl_dump(p, "protocol %s ", 230 rtnl_route_proto2str(r->rt_protocol, buf, sizeof(buf))); 231 232 if (r->ce_mask & ROUTE_ATTR_IIF) { 233 if (link_cache) { 234 nl_dump(p, "iif %s ", 235 rtnl_link_i2name(link_cache, r->rt_iif, 236 buf, sizeof(buf))); 237 } else 238 nl_dump(p, "iif %d ", r->rt_iif); 239 } 240 241 if (r->ce_mask & ROUTE_ATTR_SRC) 242 nl_dump(p, "src %s ", nl_addr2str(r->rt_src, buf, sizeof(buf))); 243 244 nl_dump(p, "\n"); 245 246 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 247 struct rtnl_nexthop *nh; 248 249 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 250 nl_dump_line(p, " "); 251 p->dp_ivar = NH_DUMP_FROM_DETAILS; 252 rtnl_route_nh_dump(nh, p); 253 nl_dump(p, "\n"); 254 } 255 } 256 257 if ((r->ce_mask & ROUTE_ATTR_CACHEINFO) && r->rt_cacheinfo.rtci_error) { 258 nl_dump_line(p, " cacheinfo error %d (%s)\n", 259 r->rt_cacheinfo.rtci_error, 260 strerror(-r->rt_cacheinfo.rtci_error)); 261 } 262 263 if (r->ce_mask & ROUTE_ATTR_METRICS) { 264 nl_dump_line(p, " metrics ["); 265 for (i = 0; i < RTAX_MAX; i++) 266 if (r->rt_metrics_mask & (1 << i)) 267 nl_dump(p, "%s %u ", 268 rtnl_route_metric2str(i+1, 269 buf, sizeof(buf)), 270 r->rt_metrics[i]); 271 nl_dump(p, "]\n"); 272 } 273} 274 275static void route_dump_stats(struct nl_object *obj, struct nl_dump_params *p) 276{ 277 struct rtnl_route *route = (struct rtnl_route *) obj; 278 279 route_dump_details(obj, p); 280 281 if (route->ce_mask & ROUTE_ATTR_CACHEINFO) { 282 struct rtnl_rtcacheinfo *ci = &route->rt_cacheinfo; 283 284 nl_dump_line(p, " used %u refcnt %u last-use %us " 285 "expires %us\n", 286 ci->rtci_used, ci->rtci_clntref, 287 ci->rtci_last_use / nl_get_hz(), 288 ci->rtci_expires / nl_get_hz()); 289 } 290} 291 292static void route_dump_env(struct nl_object *obj, struct nl_dump_params *p) 293{ 294 struct rtnl_route *route = (struct rtnl_route *) obj; 295 struct nl_cache *link_cache; 296 char buf[128]; 297 298 link_cache = nl_cache_mngt_require("route/link"); 299 300 nl_dump_line(p, "ROUTE_FAMILY=%s\n", 301 nl_af2str(route->rt_family, buf, sizeof(buf))); 302 303 if (route->ce_mask & ROUTE_ATTR_DST) 304 nl_dump_line(p, "ROUTE_DST=%s\n", 305 nl_addr2str(route->rt_dst, buf, sizeof(buf))); 306 307 if (route->ce_mask & ROUTE_ATTR_SRC) 308 nl_dump_line(p, "ROUTE_SRC=%s\n", 309 nl_addr2str(route->rt_src, buf, sizeof(buf))); 310 311 if (route->ce_mask & ROUTE_ATTR_PREF_SRC) 312 nl_dump_line(p, "ROUTE_PREFSRC=%s\n", 313 nl_addr2str(route->rt_pref_src, buf, sizeof(buf))); 314 315 if (route->ce_mask & ROUTE_ATTR_IIF) { 316 if (link_cache) { 317 nl_dump_line(p, "ROUTE_IIF=%s", 318 rtnl_link_i2name(link_cache, route->rt_iif, 319 buf, sizeof(buf))); 320 } else 321 nl_dump_line(p, "ROUTE_IIF=%d", route->rt_iif); 322 } 323 324 if (route->ce_mask & ROUTE_ATTR_TOS) 325 nl_dump_line(p, "ROUTE_TOS=%u\n", route->rt_tos); 326 327 if (route->ce_mask & ROUTE_ATTR_TABLE) 328 nl_dump_line(p, "ROUTE_TABLE=%u\n", 329 route->rt_table); 330 331 if (route->ce_mask & ROUTE_ATTR_SCOPE) 332 nl_dump_line(p, "ROUTE_SCOPE=%s\n", 333 rtnl_scope2str(route->rt_scope, buf, sizeof(buf))); 334 335 if (route->ce_mask & ROUTE_ATTR_PRIO) 336 nl_dump_line(p, "ROUTE_PRIORITY=%u\n", 337 route->rt_prio); 338 339 if (route->ce_mask & ROUTE_ATTR_TYPE) 340 nl_dump_line(p, "ROUTE_TYPE=%s\n", 341 nl_rtntype2str(route->rt_type, buf, sizeof(buf))); 342 343 if (route->ce_mask & ROUTE_ATTR_MULTIPATH) { 344 struct rtnl_nexthop *nh; 345 int index = 1; 346 347 if (route->rt_nr_nh > 0) 348 nl_dump_line(p, "ROUTE_NR_NH=%u\n", route->rt_nr_nh); 349 350 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) { 351 p->dp_ivar = index++; 352 rtnl_route_nh_dump(nh, p); 353 } 354 } 355} 356 357static int route_compare(struct nl_object *_a, struct nl_object *_b, 358 uint32_t attrs, int flags) 359{ 360 struct rtnl_route *a = (struct rtnl_route *) _a; 361 struct rtnl_route *b = (struct rtnl_route *) _b; 362 struct rtnl_nexthop *nh_a, *nh_b; 363 int i, diff = 0, found; 364 365#define ROUTE_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, ROUTE_ATTR_##ATTR, a, b, EXPR) 366 367 diff |= ROUTE_DIFF(FAMILY, a->rt_family != b->rt_family); 368 diff |= ROUTE_DIFF(TOS, a->rt_tos != b->rt_tos); 369 diff |= ROUTE_DIFF(TABLE, a->rt_table != b->rt_table); 370 diff |= ROUTE_DIFF(PROTOCOL, a->rt_protocol != b->rt_protocol); 371 diff |= ROUTE_DIFF(SCOPE, a->rt_scope != b->rt_scope); 372 diff |= ROUTE_DIFF(TYPE, a->rt_type != b->rt_type); 373 diff |= ROUTE_DIFF(PRIO, a->rt_prio != b->rt_prio); 374 diff |= ROUTE_DIFF(DST, nl_addr_cmp(a->rt_dst, b->rt_dst)); 375 diff |= ROUTE_DIFF(SRC, nl_addr_cmp(a->rt_src, b->rt_src)); 376 diff |= ROUTE_DIFF(IIF, a->rt_iif != b->rt_iif); 377 diff |= ROUTE_DIFF(PREF_SRC, nl_addr_cmp(a->rt_pref_src, 378 b->rt_pref_src)); 379 380 if (flags & LOOSE_COMPARISON) { 381 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) { 382 found = 0; 383 nl_list_for_each_entry(nh_a, &a->rt_nexthops, 384 rtnh_list) { 385 if (!rtnl_route_nh_compare(nh_a, nh_b, 386 nh_b->ce_mask, 1)) { 387 found = 1; 388 break; 389 } 390 } 391 392 if (!found) 393 goto nh_mismatch; 394 } 395 396 for (i = 0; i < RTAX_MAX - 1; i++) { 397 if (a->rt_metrics_mask & (1 << i) && 398 (!(b->rt_metrics_mask & (1 << i)) || 399 a->rt_metrics[i] != b->rt_metrics[i])) 400 ROUTE_DIFF(METRICS, 1); 401 } 402 403 diff |= ROUTE_DIFF(FLAGS, 404 (a->rt_flags ^ b->rt_flags) & b->rt_flag_mask); 405 } else { 406 if (a->rt_nr_nh != a->rt_nr_nh) 407 goto nh_mismatch; 408 409 /* search for a dup in each nh of a */ 410 nl_list_for_each_entry(nh_a, &a->rt_nexthops, rtnh_list) { 411 found = 0; 412 nl_list_for_each_entry(nh_b, &b->rt_nexthops, 413 rtnh_list) { 414 if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) 415 found = 1; 416 break; 417 } 418 if (!found) 419 goto nh_mismatch; 420 } 421 422 /* search for a dup in each nh of b, covers case where a has 423 * dupes itself */ 424 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) { 425 found = 0; 426 nl_list_for_each_entry(nh_a, &a->rt_nexthops, 427 rtnh_list) { 428 if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) 429 found = 1; 430 break; 431 } 432 if (!found) 433 goto nh_mismatch; 434 } 435 436 for (i = 0; i < RTAX_MAX - 1; i++) { 437 if ((a->rt_metrics_mask & (1 << i)) ^ 438 (b->rt_metrics_mask & (1 << i))) 439 diff |= ROUTE_DIFF(METRICS, 1); 440 else 441 diff |= ROUTE_DIFF(METRICS, 442 a->rt_metrics[i] != b->rt_metrics[i]); 443 } 444 445 diff |= ROUTE_DIFF(FLAGS, a->rt_flags != b->rt_flags); 446 } 447 448out: 449 return diff; 450 451nh_mismatch: 452 diff |= ROUTE_DIFF(MULTIPATH, 1); 453 goto out; 454 455#undef ROUTE_DIFF 456} 457 458static struct trans_tbl route_attrs[] = { 459 __ADD(ROUTE_ATTR_FAMILY, family) 460 __ADD(ROUTE_ATTR_TOS, tos) 461 __ADD(ROUTE_ATTR_TABLE, table) 462 __ADD(ROUTE_ATTR_PROTOCOL, protocol) 463 __ADD(ROUTE_ATTR_SCOPE, scope) 464 __ADD(ROUTE_ATTR_TYPE, type) 465 __ADD(ROUTE_ATTR_FLAGS, flags) 466 __ADD(ROUTE_ATTR_DST, dst) 467 __ADD(ROUTE_ATTR_SRC, src) 468 __ADD(ROUTE_ATTR_IIF, iif) 469 __ADD(ROUTE_ATTR_OIF, oif) 470 __ADD(ROUTE_ATTR_GATEWAY, gateway) 471 __ADD(ROUTE_ATTR_PRIO, prio) 472 __ADD(ROUTE_ATTR_PREF_SRC, pref_src) 473 __ADD(ROUTE_ATTR_METRICS, metrics) 474 __ADD(ROUTE_ATTR_MULTIPATH, multipath) 475 __ADD(ROUTE_ATTR_REALMS, realms) 476 __ADD(ROUTE_ATTR_CACHEINFO, cacheinfo) 477}; 478 479static char *route_attrs2str(int attrs, char *buf, size_t len) 480{ 481 return __flags2str(attrs, buf, len, route_attrs, 482 ARRAY_SIZE(route_attrs)); 483} 484 485/** 486 * @name Allocation/Freeing 487 * @{ 488 */ 489 490struct rtnl_route *rtnl_route_alloc(void) 491{ 492 return (struct rtnl_route *) nl_object_alloc(&route_obj_ops); 493} 494 495void rtnl_route_get(struct rtnl_route *route) 496{ 497 nl_object_get((struct nl_object *) route); 498} 499 500void rtnl_route_put(struct rtnl_route *route) 501{ 502 nl_object_put((struct nl_object *) route); 503} 504 505/** @} */ 506 507/** 508 * @name Attributes 509 * @{ 510 */ 511 512void rtnl_route_set_table(struct rtnl_route *route, uint32_t table) 513{ 514 route->rt_table = table; 515 route->ce_mask |= ROUTE_ATTR_TABLE; 516} 517 518uint32_t rtnl_route_get_table(struct rtnl_route *route) 519{ 520 return route->rt_table; 521} 522 523void rtnl_route_set_scope(struct rtnl_route *route, uint8_t scope) 524{ 525 route->rt_scope = scope; 526 route->ce_mask |= ROUTE_ATTR_SCOPE; 527} 528 529uint8_t rtnl_route_get_scope(struct rtnl_route *route) 530{ 531 return route->rt_scope; 532} 533 534void rtnl_route_set_tos(struct rtnl_route *route, uint8_t tos) 535{ 536 route->rt_tos = tos; 537 route->ce_mask |= ROUTE_ATTR_TOS; 538} 539 540uint8_t rtnl_route_get_tos(struct rtnl_route *route) 541{ 542 return route->rt_tos; 543} 544 545void rtnl_route_set_protocol(struct rtnl_route *route, uint8_t protocol) 546{ 547 route->rt_protocol = protocol; 548 route->ce_mask |= ROUTE_ATTR_PROTOCOL; 549} 550 551uint8_t rtnl_route_get_protocol(struct rtnl_route *route) 552{ 553 return route->rt_protocol; 554} 555 556void rtnl_route_set_priority(struct rtnl_route *route, uint32_t prio) 557{ 558 route->rt_prio = prio; 559 route->ce_mask |= ROUTE_ATTR_PRIO; 560} 561 562uint32_t rtnl_route_get_priority(struct rtnl_route *route) 563{ 564 return route->rt_prio; 565} 566 567int rtnl_route_set_family(struct rtnl_route *route, uint8_t family) 568{ 569 if (family != AF_INET && family != AF_INET6 && family != AF_DECnet) 570 return -NLE_AF_NOSUPPORT; 571 572 route->rt_family = family; 573 route->ce_mask |= ROUTE_ATTR_FAMILY; 574 575 return 0; 576} 577 578uint8_t rtnl_route_get_family(struct rtnl_route *route) 579{ 580 return route->rt_family; 581} 582 583int rtnl_route_set_dst(struct rtnl_route *route, struct nl_addr *addr) 584{ 585 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 586 if (addr->a_family != route->rt_family) 587 return -NLE_AF_MISMATCH; 588 } else 589 route->rt_family = addr->a_family; 590 591 if (route->rt_dst) 592 nl_addr_put(route->rt_dst); 593 594 nl_addr_get(addr); 595 route->rt_dst = addr; 596 597 route->ce_mask |= (ROUTE_ATTR_DST | ROUTE_ATTR_FAMILY); 598 599 return 0; 600} 601 602struct nl_addr *rtnl_route_get_dst(struct rtnl_route *route) 603{ 604 return route->rt_dst; 605} 606 607int rtnl_route_set_src(struct rtnl_route *route, struct nl_addr *addr) 608{ 609 if (addr->a_family == AF_INET) 610 return -NLE_SRCRT_NOSUPPORT; 611 612 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 613 if (addr->a_family != route->rt_family) 614 return -NLE_AF_MISMATCH; 615 } else 616 route->rt_family = addr->a_family; 617 618 if (route->rt_src) 619 nl_addr_put(route->rt_src); 620 621 nl_addr_get(addr); 622 route->rt_src = addr; 623 route->ce_mask |= (ROUTE_ATTR_SRC | ROUTE_ATTR_FAMILY); 624 625 return 0; 626} 627 628struct nl_addr *rtnl_route_get_src(struct rtnl_route *route) 629{ 630 return route->rt_src; 631} 632 633int rtnl_route_set_type(struct rtnl_route *route, uint8_t type) 634{ 635 if (type > RTN_MAX) 636 return -NLE_RANGE; 637 638 route->rt_type = type; 639 route->ce_mask |= ROUTE_ATTR_TYPE; 640 641 return 0; 642} 643 644uint8_t rtnl_route_get_type(struct rtnl_route *route) 645{ 646 return route->rt_type; 647} 648 649void rtnl_route_set_flags(struct rtnl_route *route, uint32_t flags) 650{ 651 route->rt_flag_mask |= flags; 652 route->rt_flags |= flags; 653 route->ce_mask |= ROUTE_ATTR_FLAGS; 654} 655 656void rtnl_route_unset_flags(struct rtnl_route *route, uint32_t flags) 657{ 658 route->rt_flag_mask |= flags; 659 route->rt_flags &= ~flags; 660 route->ce_mask |= ROUTE_ATTR_FLAGS; 661} 662 663uint32_t rtnl_route_get_flags(struct rtnl_route *route) 664{ 665 return route->rt_flags; 666} 667 668int rtnl_route_set_metric(struct rtnl_route *route, int metric, uint32_t value) 669{ 670 if (metric > RTAX_MAX || metric < 1) 671 return -NLE_RANGE; 672 673 route->rt_metrics[metric - 1] = value; 674 675 if (!(route->rt_metrics_mask & (1 << (metric - 1)))) { 676 route->rt_nmetrics++; 677 route->rt_metrics_mask |= (1 << (metric - 1)); 678 } 679 680 route->ce_mask |= ROUTE_ATTR_METRICS; 681 682 return 0; 683} 684 685int rtnl_route_unset_metric(struct rtnl_route *route, int metric) 686{ 687 if (metric > RTAX_MAX || metric < 1) 688 return -NLE_RANGE; 689 690 if (route->rt_metrics_mask & (1 << (metric - 1))) { 691 route->rt_nmetrics--; 692 route->rt_metrics_mask &= ~(1 << (metric - 1)); 693 } 694 695 return 0; 696} 697 698int rtnl_route_get_metric(struct rtnl_route *route, int metric, uint32_t *value) 699{ 700 if (metric > RTAX_MAX || metric < 1) 701 return -NLE_RANGE; 702 703 if (!(route->rt_metrics_mask & (1 << (metric - 1)))) 704 return -NLE_OBJ_NOTFOUND; 705 706 if (value) 707 *value = route->rt_metrics[metric - 1]; 708 709 return 0; 710} 711 712int rtnl_route_set_pref_src(struct rtnl_route *route, struct nl_addr *addr) 713{ 714 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 715 if (addr->a_family != route->rt_family) 716 return -NLE_AF_MISMATCH; 717 } else 718 route->rt_family = addr->a_family; 719 720 if (route->rt_pref_src) 721 nl_addr_put(route->rt_pref_src); 722 723 nl_addr_get(addr); 724 route->rt_pref_src = addr; 725 route->ce_mask |= (ROUTE_ATTR_PREF_SRC | ROUTE_ATTR_FAMILY); 726 727 return 0; 728} 729 730struct nl_addr *rtnl_route_get_pref_src(struct rtnl_route *route) 731{ 732 return route->rt_pref_src; 733} 734 735void rtnl_route_set_iif(struct rtnl_route *route, int ifindex) 736{ 737 route->rt_iif = ifindex; 738 route->ce_mask |= ROUTE_ATTR_IIF; 739} 740 741int rtnl_route_get_iif(struct rtnl_route *route) 742{ 743 return route->rt_iif; 744} 745 746void rtnl_route_add_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh) 747{ 748 nl_list_add_tail(&nh->rtnh_list, &route->rt_nexthops); 749 route->rt_nr_nh++; 750 route->ce_mask |= ROUTE_ATTR_MULTIPATH; 751} 752 753void rtnl_route_remove_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh) 754{ 755 route->rt_nr_nh--; 756 nl_list_del(&nh->rtnh_list); 757} 758 759struct nl_list_head *rtnl_route_get_nexthops(struct rtnl_route *route) 760{ 761 return &route->rt_nexthops; 762} 763 764int rtnl_route_get_nnexthops(struct rtnl_route *route) 765{ 766 return route->rt_nr_nh; 767} 768 769void rtnl_route_foreach_nexthop(struct rtnl_route *r, 770 void (*cb)(struct rtnl_nexthop *, void *), 771 void *arg) 772{ 773 struct rtnl_nexthop *nh; 774 775 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 776 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 777 cb(nh, arg); 778 } 779 } 780} 781 782struct rtnl_nexthop *rtnl_route_nexthop_n(struct rtnl_route *r, int n) 783{ 784 struct rtnl_nexthop *nh; 785 int i; 786 787 if (r->ce_mask & ROUTE_ATTR_MULTIPATH && r->rt_nr_nh > n) { 788 i = 0; 789 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 790 if (i == n) return nh; 791 i++; 792 } 793 } 794 return NULL; 795} 796 797/** @} */ 798 799/** 800 * @name Utilities 801 * @{ 802 */ 803 804/** 805 * Guess scope of a route object. 806 * @arg route Route object. 807 * 808 * Guesses the scope of a route object, based on the following rules: 809 * @code 810 * 1) Local route -> local scope 811 * 2) At least one nexthop not directly connected -> universe scope 812 * 3) All others -> link scope 813 * @endcode 814 * 815 * @return Scope value. 816 */ 817int rtnl_route_guess_scope(struct rtnl_route *route) 818{ 819 if (route->rt_type == RTN_LOCAL) 820 return RT_SCOPE_HOST; 821 822 if (!nl_list_empty(&route->rt_nexthops)) { 823 struct rtnl_nexthop *nh; 824 825 /* 826 * Use scope uiniverse if there is at least one nexthop which 827 * is not directly connected 828 */ 829 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) { 830 if (nh->rtnh_gateway) 831 return RT_SCOPE_UNIVERSE; 832 } 833 } 834 835 return RT_SCOPE_LINK; 836} 837 838/** @} */ 839 840static struct nla_policy route_policy[RTA_MAX+1] = { 841 [RTA_IIF] = { .type = NLA_U32 }, 842 [RTA_OIF] = { .type = NLA_U32 }, 843 [RTA_PRIORITY] = { .type = NLA_U32 }, 844 [RTA_FLOW] = { .type = NLA_U32 }, 845 [RTA_CACHEINFO] = { .minlen = sizeof(struct rta_cacheinfo) }, 846 [RTA_METRICS] = { .type = NLA_NESTED }, 847 [RTA_MULTIPATH] = { .type = NLA_NESTED }, 848}; 849 850static int parse_multipath(struct rtnl_route *route, struct nlattr *attr) 851{ 852 struct rtnl_nexthop *nh = NULL; 853 struct rtnexthop *rtnh = nla_data(attr); 854 size_t tlen = nla_len(attr); 855 int err; 856 857 while (tlen >= sizeof(*rtnh) && tlen >= rtnh->rtnh_len) { 858 nh = rtnl_route_nh_alloc(); 859 if (!nh) 860 return -NLE_NOMEM; 861 862 rtnl_route_nh_set_weight(nh, rtnh->rtnh_hops); 863 rtnl_route_nh_set_ifindex(nh, rtnh->rtnh_ifindex); 864 rtnl_route_nh_set_flags(nh, rtnh->rtnh_flags); 865 866 if (rtnh->rtnh_len > sizeof(*rtnh)) { 867 struct nlattr *ntb[RTA_MAX + 1]; 868 869 err = nla_parse(ntb, RTA_MAX, (struct nlattr *) 870 RTNH_DATA(rtnh), 871 rtnh->rtnh_len - sizeof(*rtnh), 872 route_policy); 873 if (err < 0) 874 goto errout; 875 876 if (ntb[RTA_GATEWAY]) { 877 struct nl_addr *addr; 878 879 addr = nl_addr_alloc_attr(ntb[RTA_GATEWAY], 880 route->rt_family); 881 if (!addr) { 882 err = -NLE_NOMEM; 883 goto errout; 884 } 885 886 rtnl_route_nh_set_gateway(nh, addr); 887 nl_addr_put(addr); 888 } 889 890 if (ntb[RTA_FLOW]) { 891 uint32_t realms; 892 893 realms = nla_get_u32(ntb[RTA_FLOW]); 894 rtnl_route_nh_set_realms(nh, realms); 895 } 896 } 897 898 rtnl_route_add_nexthop(route, nh); 899 tlen -= RTNH_ALIGN(rtnh->rtnh_len); 900 rtnh = RTNH_NEXT(rtnh); 901 } 902 903 err = 0; 904errout: 905 if (err && nh) 906 rtnl_route_nh_free(nh); 907 908 return err; 909} 910 911int rtnl_route_parse(struct nlmsghdr *nlh, struct rtnl_route **result) 912{ 913 struct rtmsg *rtm; 914 struct rtnl_route *route; 915 struct nlattr *tb[RTA_MAX + 1]; 916 struct nl_addr *src = NULL, *dst = NULL, *addr; 917 struct rtnl_nexthop *old_nh = NULL; 918 int err, family; 919 920 route = rtnl_route_alloc(); 921 if (!route) { 922 err = -NLE_NOMEM; 923 goto errout; 924 } 925 926 route->ce_msgtype = nlh->nlmsg_type; 927 928 err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX, route_policy); 929 if (err < 0) 930 goto errout; 931 932 rtm = nlmsg_data(nlh); 933 route->rt_family = family = rtm->rtm_family; 934 route->rt_tos = rtm->rtm_tos; 935 route->rt_table = rtm->rtm_table; 936 route->rt_type = rtm->rtm_type; 937 route->rt_scope = rtm->rtm_scope; 938 route->rt_protocol = rtm->rtm_protocol; 939 route->rt_flags = rtm->rtm_flags; 940 941 route->ce_mask |= ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS | 942 ROUTE_ATTR_TABLE | ROUTE_ATTR_TYPE | 943 ROUTE_ATTR_SCOPE | ROUTE_ATTR_PROTOCOL | 944 ROUTE_ATTR_FLAGS; 945 946 if (tb[RTA_DST]) { 947 if (!(dst = nl_addr_alloc_attr(tb[RTA_DST], family))) 948 goto errout_nomem; 949 } else { 950 if (!(dst = nl_addr_alloc(0))) 951 goto errout_nomem; 952 nl_addr_set_family(dst, rtm->rtm_family); 953 } 954 955 nl_addr_set_prefixlen(dst, rtm->rtm_dst_len); 956 err = rtnl_route_set_dst(route, dst); 957 if (err < 0) 958 goto errout; 959 960 nl_addr_put(dst); 961 962 if (tb[RTA_SRC]) { 963 if (!(src = nl_addr_alloc_attr(tb[RTA_SRC], family))) 964 goto errout_nomem; 965 } else if (rtm->rtm_src_len) 966 if (!(src = nl_addr_alloc(0))) 967 goto errout_nomem; 968 969 if (src) { 970 nl_addr_set_prefixlen(src, rtm->rtm_src_len); 971 rtnl_route_set_src(route, src); 972 nl_addr_put(src); 973 } 974 975 if (tb[RTA_IIF]) 976 rtnl_route_set_iif(route, nla_get_u32(tb[RTA_IIF])); 977 978 if (tb[RTA_PRIORITY]) 979 rtnl_route_set_priority(route, nla_get_u32(tb[RTA_PRIORITY])); 980 981 if (tb[RTA_PREFSRC]) { 982 if (!(addr = nl_addr_alloc_attr(tb[RTA_PREFSRC], family))) 983 goto errout_nomem; 984 rtnl_route_set_pref_src(route, addr); 985 nl_addr_put(addr); 986 } 987 988 if (tb[RTA_METRICS]) { 989 struct nlattr *mtb[RTAX_MAX + 1]; 990 int i; 991 992 err = nla_parse_nested(mtb, RTAX_MAX, tb[RTA_METRICS], NULL); 993 if (err < 0) 994 goto errout; 995 996 for (i = 1; i <= RTAX_MAX; i++) { 997 if (mtb[i] && nla_len(mtb[i]) >= sizeof(uint32_t)) { 998 uint32_t m = nla_get_u32(mtb[i]); 999 if (rtnl_route_set_metric(route, i, m) < 0) 1000 goto errout; 1001 } 1002 } 1003 } 1004 1005 if (tb[RTA_MULTIPATH]) 1006 if ((err = parse_multipath(route, tb[RTA_MULTIPATH])) < 0) 1007 goto errout; 1008 1009 if (tb[RTA_CACHEINFO]) { 1010 nla_memcpy(&route->rt_cacheinfo, tb[RTA_CACHEINFO], 1011 sizeof(route->rt_cacheinfo)); 1012 route->ce_mask |= ROUTE_ATTR_CACHEINFO; 1013 } 1014 1015 if (tb[RTA_OIF]) { 1016 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 1017 goto errout; 1018 1019 rtnl_route_nh_set_ifindex(old_nh, nla_get_u32(tb[RTA_OIF])); 1020 } 1021 1022 if (tb[RTA_GATEWAY]) { 1023 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 1024 goto errout; 1025 1026 if (!(addr = nl_addr_alloc_attr(tb[RTA_GATEWAY], family))) 1027 goto errout_nomem; 1028 1029 rtnl_route_nh_set_gateway(old_nh, addr); 1030 nl_addr_put(addr); 1031 } 1032 1033 if (tb[RTA_FLOW]) { 1034 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 1035 goto errout; 1036 1037 rtnl_route_nh_set_realms(old_nh, nla_get_u32(tb[RTA_FLOW])); 1038 } 1039 1040 if (old_nh) { 1041 if (route->rt_nr_nh == 0) { 1042 /* If no nexthops have been provided via RTA_MULTIPATH 1043 * we add it as regular nexthop to maintain backwards 1044 * compatibility */ 1045 rtnl_route_add_nexthop(route, old_nh); 1046 } else { 1047 /* Kernel supports new style nexthop configuration, 1048 * verify that it is a duplicate and discard nexthop. */ 1049 struct rtnl_nexthop *first; 1050 1051 first = nl_list_first_entry(&route->rt_nexthops, 1052 struct rtnl_nexthop, 1053 rtnh_list); 1054 if (!first) 1055 BUG(); 1056 1057 if (rtnl_route_nh_compare(old_nh, first, 1058 old_nh->ce_mask, 0)) { 1059 err = -NLE_INVAL; 1060 goto errout; 1061 } 1062 1063 rtnl_route_nh_free(old_nh); 1064 } 1065 } 1066 1067 *result = route; 1068 return 0; 1069 1070errout: 1071 rtnl_route_put(route); 1072 return err; 1073 1074errout_nomem: 1075 err = -NLE_NOMEM; 1076 goto errout; 1077} 1078 1079int rtnl_route_build_msg(struct nl_msg *msg, struct rtnl_route *route) 1080{ 1081 int i; 1082 struct nlattr *metrics; 1083 struct rtmsg rtmsg = { 1084 .rtm_family = route->rt_family, 1085 .rtm_tos = route->rt_tos, 1086 .rtm_table = route->rt_table, 1087 .rtm_protocol = route->rt_protocol, 1088 .rtm_scope = route->rt_scope, 1089 .rtm_type = route->rt_type, 1090 .rtm_flags = route->rt_flags, 1091 }; 1092 1093 if (route->rt_dst == NULL) 1094 return -NLE_MISSING_ATTR; 1095 1096 rtmsg.rtm_dst_len = nl_addr_get_prefixlen(route->rt_dst); 1097 if (route->rt_src) 1098 rtmsg.rtm_src_len = nl_addr_get_prefixlen(route->rt_src); 1099 1100 1101 if (rtmsg.rtm_scope == RT_SCOPE_NOWHERE) 1102 rtmsg.rtm_scope = rtnl_route_guess_scope(route); 1103 1104 if (nlmsg_append(msg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0) 1105 goto nla_put_failure; 1106 1107 /* Additional table attribute replacing the 8bit in the header, was 1108 * required to allow more than 256 tables. */ 1109 NLA_PUT_U32(msg, RTA_TABLE, route->rt_table); 1110 1111 NLA_PUT_ADDR(msg, RTA_DST, route->rt_dst); 1112 NLA_PUT_U32(msg, RTA_PRIORITY, route->rt_prio); 1113 1114 if (route->ce_mask & ROUTE_ATTR_SRC) 1115 NLA_PUT_ADDR(msg, RTA_SRC, route->rt_src); 1116 1117 if (route->ce_mask & ROUTE_ATTR_PREF_SRC) 1118 NLA_PUT_ADDR(msg, RTA_PREFSRC, route->rt_pref_src); 1119 1120 if (route->ce_mask & ROUTE_ATTR_IIF) 1121 NLA_PUT_U32(msg, RTA_IIF, route->rt_iif); 1122 1123 if (route->rt_nmetrics > 0) { 1124 uint32_t val; 1125 1126 metrics = nla_nest_start(msg, RTA_METRICS); 1127 if (metrics == NULL) 1128 goto nla_put_failure; 1129 1130 for (i = 1; i <= RTAX_MAX; i++) { 1131 if (!rtnl_route_get_metric(route, i, &val)) 1132 NLA_PUT_U32(msg, i, val); 1133 } 1134 1135 nla_nest_end(msg, metrics); 1136 } 1137 1138 if (rtnl_route_get_nnexthops(route) > 0) { 1139 struct nlattr *multipath; 1140 struct rtnl_nexthop *nh; 1141 1142 if (!(multipath = nla_nest_start(msg, RTA_MULTIPATH))) 1143 goto nla_put_failure; 1144 1145 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) { 1146 struct rtnexthop *rtnh; 1147 1148 rtnh = nlmsg_reserve(msg, sizeof(*rtnh), NLMSG_ALIGNTO); 1149 if (!rtnh) 1150 goto nla_put_failure; 1151 1152 rtnh->rtnh_flags = nh->rtnh_flags; 1153 rtnh->rtnh_hops = nh->rtnh_weight; 1154 rtnh->rtnh_ifindex = nh->rtnh_ifindex; 1155 1156 if (nh->rtnh_gateway) 1157 NLA_PUT_ADDR(msg, RTA_GATEWAY, 1158 nh->rtnh_gateway); 1159 1160 if (nh->rtnh_realms) 1161 NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms); 1162 1163 rtnh->rtnh_len = nlmsg_tail(msg->nm_nlh) - 1164 (void *) rtnh; 1165 } 1166 1167 nla_nest_end(msg, multipath); 1168 } 1169 1170 return 0; 1171 1172nla_put_failure: 1173 return -NLE_MSGSIZE; 1174} 1175 1176/** @cond SKIP */ 1177struct nl_object_ops route_obj_ops = { 1178 .oo_name = "route/route", 1179 .oo_size = sizeof(struct rtnl_route), 1180 .oo_constructor = route_constructor, 1181 .oo_free_data = route_free_data, 1182 .oo_clone = route_clone, 1183 .oo_dump = { 1184 [NL_DUMP_LINE] = route_dump_line, 1185 [NL_DUMP_DETAILS] = route_dump_details, 1186 [NL_DUMP_STATS] = route_dump_stats, 1187 [NL_DUMP_ENV] = route_dump_env, 1188 }, 1189 .oo_compare = route_compare, 1190 .oo_attrs2str = route_attrs2str, 1191 .oo_id_attrs = (ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS | 1192 ROUTE_ATTR_TABLE | ROUTE_ATTR_DST), 1193}; 1194/** @endcond */ 1195 1196/** @} */ 1197