libnl 3.0
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00001 /* 00002 * lib/route/route_obj.c Route Object 00003 * 00004 * This library is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU Lesser General Public 00006 * License as published by the Free Software Foundation version 2.1 00007 * of the License. 00008 * 00009 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch> 00010 */ 00011 00012 /** 00013 * @ingroup route 00014 * @defgroup route_obj Route Object 00015 * 00016 * @par Attributes 00017 * @code 00018 * Name Default 00019 * ------------------------------------------------------------- 00020 * routing table RT_TABLE_MAIN 00021 * scope RT_SCOPE_NOWHERE 00022 * tos 0 00023 * protocol RTPROT_STATIC 00024 * prio 0 00025 * family AF_UNSPEC 00026 * type RTN_UNICAST 00027 * iif NULL 00028 * @endcode 00029 * 00030 * @{ 00031 */ 00032 00033 #include <netlink-local.h> 00034 #include <netlink/netlink.h> 00035 #include <netlink/cache.h> 00036 #include <netlink/utils.h> 00037 #include <netlink/data.h> 00038 #include <netlink/route/rtnl.h> 00039 #include <netlink/route/route.h> 00040 #include <netlink/route/link.h> 00041 #include <netlink/route/nexthop.h> 00042 00043 /** @cond SKIP */ 00044 #define ROUTE_ATTR_FAMILY 0x000001 00045 #define ROUTE_ATTR_TOS 0x000002 00046 #define ROUTE_ATTR_TABLE 0x000004 00047 #define ROUTE_ATTR_PROTOCOL 0x000008 00048 #define ROUTE_ATTR_SCOPE 0x000010 00049 #define ROUTE_ATTR_TYPE 0x000020 00050 #define ROUTE_ATTR_FLAGS 0x000040 00051 #define ROUTE_ATTR_DST 0x000080 00052 #define ROUTE_ATTR_SRC 0x000100 00053 #define ROUTE_ATTR_IIF 0x000200 00054 #define ROUTE_ATTR_OIF 0x000400 00055 #define ROUTE_ATTR_GATEWAY 0x000800 00056 #define ROUTE_ATTR_PRIO 0x001000 00057 #define ROUTE_ATTR_PREF_SRC 0x002000 00058 #define ROUTE_ATTR_METRICS 0x004000 00059 #define ROUTE_ATTR_MULTIPATH 0x008000 00060 #define ROUTE_ATTR_REALMS 0x010000 00061 #define ROUTE_ATTR_CACHEINFO 0x020000 00062 /** @endcond */ 00063 00064 static void route_constructor(struct nl_object *c) 00065 { 00066 struct rtnl_route *r = (struct rtnl_route *) c; 00067 00068 r->rt_family = AF_UNSPEC; 00069 r->rt_scope = RT_SCOPE_NOWHERE; 00070 r->rt_table = RT_TABLE_MAIN; 00071 r->rt_protocol = RTPROT_STATIC; 00072 r->rt_type = RTN_UNICAST; 00073 00074 nl_init_list_head(&r->rt_nexthops); 00075 } 00076 00077 static void route_free_data(struct nl_object *c) 00078 { 00079 struct rtnl_route *r = (struct rtnl_route *) c; 00080 struct rtnl_nexthop *nh, *tmp; 00081 00082 if (r == NULL) 00083 return; 00084 00085 nl_addr_put(r->rt_dst); 00086 nl_addr_put(r->rt_src); 00087 nl_addr_put(r->rt_pref_src); 00088 00089 nl_list_for_each_entry_safe(nh, tmp, &r->rt_nexthops, rtnh_list) { 00090 rtnl_route_remove_nexthop(r, nh); 00091 rtnl_route_nh_free(nh); 00092 } 00093 } 00094 00095 static int route_clone(struct nl_object *_dst, struct nl_object *_src) 00096 { 00097 struct rtnl_route *dst = (struct rtnl_route *) _dst; 00098 struct rtnl_route *src = (struct rtnl_route *) _src; 00099 struct rtnl_nexthop *nh, *new; 00100 00101 if (src->rt_dst) 00102 if (!(dst->rt_dst = nl_addr_clone(src->rt_dst))) 00103 return -NLE_NOMEM; 00104 00105 if (src->rt_src) 00106 if (!(dst->rt_src = nl_addr_clone(src->rt_src))) 00107 return -NLE_NOMEM; 00108 00109 if (src->rt_pref_src) 00110 if (!(dst->rt_pref_src = nl_addr_clone(src->rt_pref_src))) 00111 return -NLE_NOMEM; 00112 00113 nl_init_list_head(&dst->rt_nexthops); 00114 nl_list_for_each_entry(nh, &src->rt_nexthops, rtnh_list) { 00115 new = rtnl_route_nh_clone(nh); 00116 if (!new) 00117 return -NLE_NOMEM; 00118 00119 rtnl_route_add_nexthop(dst, new); 00120 } 00121 00122 return 0; 00123 } 00124 00125 static void route_dump_line(struct nl_object *a, struct nl_dump_params *p) 00126 { 00127 struct rtnl_route *r = (struct rtnl_route *) a; 00128 struct nl_cache *link_cache; 00129 int cache = 0, flags; 00130 char buf[64]; 00131 00132 link_cache = nl_cache_mngt_require("route/link"); 00133 00134 if (r->rt_flags & RTM_F_CLONED) 00135 cache = 1; 00136 00137 nl_dump_line(p, "%s ", nl_af2str(r->rt_family, buf, sizeof(buf))); 00138 00139 if (cache) 00140 nl_dump(p, "cache "); 00141 00142 if (!(r->ce_mask & ROUTE_ATTR_DST) || 00143 nl_addr_get_len(r->rt_dst) == 0) 00144 nl_dump(p, "default "); 00145 else 00146 nl_dump(p, "%s ", nl_addr2str(r->rt_dst, buf, sizeof(buf))); 00147 00148 if (r->ce_mask & ROUTE_ATTR_TABLE && !cache) 00149 nl_dump(p, "table %s ", 00150 rtnl_route_table2str(r->rt_table, buf, sizeof(buf))); 00151 00152 if (r->ce_mask & ROUTE_ATTR_TYPE) 00153 nl_dump(p, "type %s ", 00154 nl_rtntype2str(r->rt_type, buf, sizeof(buf))); 00155 00156 if (r->ce_mask & ROUTE_ATTR_TOS && r->rt_tos != 0) 00157 nl_dump(p, "tos %#x ", r->rt_tos); 00158 00159 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 00160 struct rtnl_nexthop *nh; 00161 00162 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 00163 p->dp_ivar = NH_DUMP_FROM_ONELINE; 00164 rtnl_route_nh_dump(nh, p); 00165 } 00166 } 00167 00168 flags = r->rt_flags & ~(RTM_F_CLONED); 00169 if (r->ce_mask & ROUTE_ATTR_FLAGS && flags) { 00170 00171 nl_dump(p, "<"); 00172 00173 #define PRINT_FLAG(f) if (flags & RTNH_F_##f) { \ 00174 flags &= ~RTNH_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 00175 PRINT_FLAG(DEAD); 00176 PRINT_FLAG(ONLINK); 00177 PRINT_FLAG(PERVASIVE); 00178 #undef PRINT_FLAG 00179 00180 #define PRINT_FLAG(f) if (flags & RTM_F_##f) { \ 00181 flags &= ~RTM_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 00182 PRINT_FLAG(NOTIFY); 00183 PRINT_FLAG(EQUALIZE); 00184 PRINT_FLAG(PREFIX); 00185 #undef PRINT_FLAG 00186 00187 #define PRINT_FLAG(f) if (flags & RTCF_##f) { \ 00188 flags &= ~RTCF_##f; nl_dump(p, #f "%s", flags ? "," : ""); } 00189 PRINT_FLAG(NOTIFY); 00190 PRINT_FLAG(REDIRECTED); 00191 PRINT_FLAG(DOREDIRECT); 00192 PRINT_FLAG(DIRECTSRC); 00193 PRINT_FLAG(DNAT); 00194 PRINT_FLAG(BROADCAST); 00195 PRINT_FLAG(MULTICAST); 00196 PRINT_FLAG(LOCAL); 00197 #undef PRINT_FLAG 00198 00199 nl_dump(p, ">"); 00200 } 00201 00202 nl_dump(p, "\n"); 00203 } 00204 00205 static void route_dump_details(struct nl_object *a, struct nl_dump_params *p) 00206 { 00207 struct rtnl_route *r = (struct rtnl_route *) a; 00208 struct nl_cache *link_cache; 00209 char buf[128]; 00210 int i; 00211 00212 link_cache = nl_cache_mngt_require("route/link"); 00213 00214 route_dump_line(a, p); 00215 nl_dump_line(p, " "); 00216 00217 if (r->ce_mask & ROUTE_ATTR_PREF_SRC) 00218 nl_dump(p, "preferred-src %s ", 00219 nl_addr2str(r->rt_pref_src, buf, sizeof(buf))); 00220 00221 if (r->ce_mask & ROUTE_ATTR_SCOPE && r->rt_scope != RT_SCOPE_NOWHERE) 00222 nl_dump(p, "scope %s ", 00223 rtnl_scope2str(r->rt_scope, buf, sizeof(buf))); 00224 00225 if (r->ce_mask & ROUTE_ATTR_PRIO) 00226 nl_dump(p, "priority %#x ", r->rt_prio); 00227 00228 if (r->ce_mask & ROUTE_ATTR_PROTOCOL) 00229 nl_dump(p, "protocol %s ", 00230 rtnl_route_proto2str(r->rt_protocol, buf, sizeof(buf))); 00231 00232 if (r->ce_mask & ROUTE_ATTR_IIF) { 00233 if (link_cache) { 00234 nl_dump(p, "iif %s ", 00235 rtnl_link_i2name(link_cache, r->rt_iif, 00236 buf, sizeof(buf))); 00237 } else 00238 nl_dump(p, "iif %d ", r->rt_iif); 00239 } 00240 00241 if (r->ce_mask & ROUTE_ATTR_SRC) 00242 nl_dump(p, "src %s ", nl_addr2str(r->rt_src, buf, sizeof(buf))); 00243 00244 nl_dump(p, "\n"); 00245 00246 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 00247 struct rtnl_nexthop *nh; 00248 00249 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 00250 nl_dump_line(p, " "); 00251 p->dp_ivar = NH_DUMP_FROM_DETAILS; 00252 rtnl_route_nh_dump(nh, p); 00253 nl_dump(p, "\n"); 00254 } 00255 } 00256 00257 if ((r->ce_mask & ROUTE_ATTR_CACHEINFO) && r->rt_cacheinfo.rtci_error) { 00258 nl_dump_line(p, " cacheinfo error %d (%s)\n", 00259 r->rt_cacheinfo.rtci_error, 00260 strerror(-r->rt_cacheinfo.rtci_error)); 00261 } 00262 00263 if (r->ce_mask & ROUTE_ATTR_METRICS) { 00264 nl_dump_line(p, " metrics ["); 00265 for (i = 0; i < RTAX_MAX; i++) 00266 if (r->rt_metrics_mask & (1 << i)) 00267 nl_dump(p, "%s %u ", 00268 rtnl_route_metric2str(i+1, 00269 buf, sizeof(buf)), 00270 r->rt_metrics[i]); 00271 nl_dump(p, "]\n"); 00272 } 00273 } 00274 00275 static void route_dump_stats(struct nl_object *obj, struct nl_dump_params *p) 00276 { 00277 struct rtnl_route *route = (struct rtnl_route *) obj; 00278 00279 route_dump_details(obj, p); 00280 00281 if (route->ce_mask & ROUTE_ATTR_CACHEINFO) { 00282 struct rtnl_rtcacheinfo *ci = &route->rt_cacheinfo; 00283 00284 nl_dump_line(p, " used %u refcnt %u last-use %us " 00285 "expires %us\n", 00286 ci->rtci_used, ci->rtci_clntref, 00287 ci->rtci_last_use / nl_get_user_hz(), 00288 ci->rtci_expires / nl_get_user_hz()); 00289 } 00290 } 00291 00292 static int route_compare(struct nl_object *_a, struct nl_object *_b, 00293 uint32_t attrs, int flags) 00294 { 00295 struct rtnl_route *a = (struct rtnl_route *) _a; 00296 struct rtnl_route *b = (struct rtnl_route *) _b; 00297 struct rtnl_nexthop *nh_a, *nh_b; 00298 int i, diff = 0, found; 00299 00300 #define ROUTE_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, ROUTE_ATTR_##ATTR, a, b, EXPR) 00301 00302 diff |= ROUTE_DIFF(FAMILY, a->rt_family != b->rt_family); 00303 diff |= ROUTE_DIFF(TOS, a->rt_tos != b->rt_tos); 00304 diff |= ROUTE_DIFF(TABLE, a->rt_table != b->rt_table); 00305 diff |= ROUTE_DIFF(PROTOCOL, a->rt_protocol != b->rt_protocol); 00306 diff |= ROUTE_DIFF(SCOPE, a->rt_scope != b->rt_scope); 00307 diff |= ROUTE_DIFF(TYPE, a->rt_type != b->rt_type); 00308 diff |= ROUTE_DIFF(PRIO, a->rt_prio != b->rt_prio); 00309 diff |= ROUTE_DIFF(DST, nl_addr_cmp(a->rt_dst, b->rt_dst)); 00310 diff |= ROUTE_DIFF(SRC, nl_addr_cmp(a->rt_src, b->rt_src)); 00311 diff |= ROUTE_DIFF(IIF, a->rt_iif != b->rt_iif); 00312 diff |= ROUTE_DIFF(PREF_SRC, nl_addr_cmp(a->rt_pref_src, 00313 b->rt_pref_src)); 00314 00315 if (flags & LOOSE_COMPARISON) { 00316 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) { 00317 found = 0; 00318 nl_list_for_each_entry(nh_a, &a->rt_nexthops, 00319 rtnh_list) { 00320 if (!rtnl_route_nh_compare(nh_a, nh_b, 00321 nh_b->ce_mask, 1)) { 00322 found = 1; 00323 break; 00324 } 00325 } 00326 00327 if (!found) 00328 goto nh_mismatch; 00329 } 00330 00331 for (i = 0; i < RTAX_MAX - 1; i++) { 00332 if (a->rt_metrics_mask & (1 << i) && 00333 (!(b->rt_metrics_mask & (1 << i)) || 00334 a->rt_metrics[i] != b->rt_metrics[i])) 00335 ROUTE_DIFF(METRICS, 1); 00336 } 00337 00338 diff |= ROUTE_DIFF(FLAGS, 00339 (a->rt_flags ^ b->rt_flags) & b->rt_flag_mask); 00340 } else { 00341 if (a->rt_nr_nh != a->rt_nr_nh) 00342 goto nh_mismatch; 00343 00344 /* search for a dup in each nh of a */ 00345 nl_list_for_each_entry(nh_a, &a->rt_nexthops, rtnh_list) { 00346 found = 0; 00347 nl_list_for_each_entry(nh_b, &b->rt_nexthops, 00348 rtnh_list) { 00349 if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) 00350 found = 1; 00351 break; 00352 } 00353 if (!found) 00354 goto nh_mismatch; 00355 } 00356 00357 /* search for a dup in each nh of b, covers case where a has 00358 * dupes itself */ 00359 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) { 00360 found = 0; 00361 nl_list_for_each_entry(nh_a, &a->rt_nexthops, 00362 rtnh_list) { 00363 if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) 00364 found = 1; 00365 break; 00366 } 00367 if (!found) 00368 goto nh_mismatch; 00369 } 00370 00371 for (i = 0; i < RTAX_MAX - 1; i++) { 00372 if ((a->rt_metrics_mask & (1 << i)) ^ 00373 (b->rt_metrics_mask & (1 << i))) 00374 diff |= ROUTE_DIFF(METRICS, 1); 00375 else 00376 diff |= ROUTE_DIFF(METRICS, 00377 a->rt_metrics[i] != b->rt_metrics[i]); 00378 } 00379 00380 diff |= ROUTE_DIFF(FLAGS, a->rt_flags != b->rt_flags); 00381 } 00382 00383 out: 00384 return diff; 00385 00386 nh_mismatch: 00387 diff |= ROUTE_DIFF(MULTIPATH, 1); 00388 goto out; 00389 00390 #undef ROUTE_DIFF 00391 } 00392 00393 static const struct trans_tbl route_attrs[] = { 00394 __ADD(ROUTE_ATTR_FAMILY, family) 00395 __ADD(ROUTE_ATTR_TOS, tos) 00396 __ADD(ROUTE_ATTR_TABLE, table) 00397 __ADD(ROUTE_ATTR_PROTOCOL, protocol) 00398 __ADD(ROUTE_ATTR_SCOPE, scope) 00399 __ADD(ROUTE_ATTR_TYPE, type) 00400 __ADD(ROUTE_ATTR_FLAGS, flags) 00401 __ADD(ROUTE_ATTR_DST, dst) 00402 __ADD(ROUTE_ATTR_SRC, src) 00403 __ADD(ROUTE_ATTR_IIF, iif) 00404 __ADD(ROUTE_ATTR_OIF, oif) 00405 __ADD(ROUTE_ATTR_GATEWAY, gateway) 00406 __ADD(ROUTE_ATTR_PRIO, prio) 00407 __ADD(ROUTE_ATTR_PREF_SRC, pref_src) 00408 __ADD(ROUTE_ATTR_METRICS, metrics) 00409 __ADD(ROUTE_ATTR_MULTIPATH, multipath) 00410 __ADD(ROUTE_ATTR_REALMS, realms) 00411 __ADD(ROUTE_ATTR_CACHEINFO, cacheinfo) 00412 }; 00413 00414 static char *route_attrs2str(int attrs, char *buf, size_t len) 00415 { 00416 return __flags2str(attrs, buf, len, route_attrs, 00417 ARRAY_SIZE(route_attrs)); 00418 } 00419 00420 /** 00421 * @name Allocation/Freeing 00422 * @{ 00423 */ 00424 00425 struct rtnl_route *rtnl_route_alloc(void) 00426 { 00427 return (struct rtnl_route *) nl_object_alloc(&route_obj_ops); 00428 } 00429 00430 void rtnl_route_get(struct rtnl_route *route) 00431 { 00432 nl_object_get((struct nl_object *) route); 00433 } 00434 00435 void rtnl_route_put(struct rtnl_route *route) 00436 { 00437 nl_object_put((struct nl_object *) route); 00438 } 00439 00440 /** @} */ 00441 00442 /** 00443 * @name Attributes 00444 * @{ 00445 */ 00446 00447 void rtnl_route_set_table(struct rtnl_route *route, uint32_t table) 00448 { 00449 route->rt_table = table; 00450 route->ce_mask |= ROUTE_ATTR_TABLE; 00451 } 00452 00453 uint32_t rtnl_route_get_table(struct rtnl_route *route) 00454 { 00455 return route->rt_table; 00456 } 00457 00458 void rtnl_route_set_scope(struct rtnl_route *route, uint8_t scope) 00459 { 00460 route->rt_scope = scope; 00461 route->ce_mask |= ROUTE_ATTR_SCOPE; 00462 } 00463 00464 uint8_t rtnl_route_get_scope(struct rtnl_route *route) 00465 { 00466 return route->rt_scope; 00467 } 00468 00469 void rtnl_route_set_tos(struct rtnl_route *route, uint8_t tos) 00470 { 00471 route->rt_tos = tos; 00472 route->ce_mask |= ROUTE_ATTR_TOS; 00473 } 00474 00475 uint8_t rtnl_route_get_tos(struct rtnl_route *route) 00476 { 00477 return route->rt_tos; 00478 } 00479 00480 void rtnl_route_set_protocol(struct rtnl_route *route, uint8_t protocol) 00481 { 00482 route->rt_protocol = protocol; 00483 route->ce_mask |= ROUTE_ATTR_PROTOCOL; 00484 } 00485 00486 uint8_t rtnl_route_get_protocol(struct rtnl_route *route) 00487 { 00488 return route->rt_protocol; 00489 } 00490 00491 void rtnl_route_set_priority(struct rtnl_route *route, uint32_t prio) 00492 { 00493 route->rt_prio = prio; 00494 route->ce_mask |= ROUTE_ATTR_PRIO; 00495 } 00496 00497 uint32_t rtnl_route_get_priority(struct rtnl_route *route) 00498 { 00499 return route->rt_prio; 00500 } 00501 00502 int rtnl_route_set_family(struct rtnl_route *route, uint8_t family) 00503 { 00504 if (family != AF_INET && family != AF_INET6 && family != AF_DECnet) 00505 return -NLE_AF_NOSUPPORT; 00506 00507 route->rt_family = family; 00508 route->ce_mask |= ROUTE_ATTR_FAMILY; 00509 00510 return 0; 00511 } 00512 00513 uint8_t rtnl_route_get_family(struct rtnl_route *route) 00514 { 00515 return route->rt_family; 00516 } 00517 00518 int rtnl_route_set_dst(struct rtnl_route *route, struct nl_addr *addr) 00519 { 00520 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 00521 if (addr->a_family != route->rt_family) 00522 return -NLE_AF_MISMATCH; 00523 } else 00524 route->rt_family = addr->a_family; 00525 00526 if (route->rt_dst) 00527 nl_addr_put(route->rt_dst); 00528 00529 nl_addr_get(addr); 00530 route->rt_dst = addr; 00531 00532 route->ce_mask |= (ROUTE_ATTR_DST | ROUTE_ATTR_FAMILY); 00533 00534 return 0; 00535 } 00536 00537 struct nl_addr *rtnl_route_get_dst(struct rtnl_route *route) 00538 { 00539 return route->rt_dst; 00540 } 00541 00542 int rtnl_route_set_src(struct rtnl_route *route, struct nl_addr *addr) 00543 { 00544 if (addr->a_family == AF_INET) 00545 return -NLE_SRCRT_NOSUPPORT; 00546 00547 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 00548 if (addr->a_family != route->rt_family) 00549 return -NLE_AF_MISMATCH; 00550 } else 00551 route->rt_family = addr->a_family; 00552 00553 if (route->rt_src) 00554 nl_addr_put(route->rt_src); 00555 00556 nl_addr_get(addr); 00557 route->rt_src = addr; 00558 route->ce_mask |= (ROUTE_ATTR_SRC | ROUTE_ATTR_FAMILY); 00559 00560 return 0; 00561 } 00562 00563 struct nl_addr *rtnl_route_get_src(struct rtnl_route *route) 00564 { 00565 return route->rt_src; 00566 } 00567 00568 int rtnl_route_set_type(struct rtnl_route *route, uint8_t type) 00569 { 00570 if (type > RTN_MAX) 00571 return -NLE_RANGE; 00572 00573 route->rt_type = type; 00574 route->ce_mask |= ROUTE_ATTR_TYPE; 00575 00576 return 0; 00577 } 00578 00579 uint8_t rtnl_route_get_type(struct rtnl_route *route) 00580 { 00581 return route->rt_type; 00582 } 00583 00584 void rtnl_route_set_flags(struct rtnl_route *route, uint32_t flags) 00585 { 00586 route->rt_flag_mask |= flags; 00587 route->rt_flags |= flags; 00588 route->ce_mask |= ROUTE_ATTR_FLAGS; 00589 } 00590 00591 void rtnl_route_unset_flags(struct rtnl_route *route, uint32_t flags) 00592 { 00593 route->rt_flag_mask |= flags; 00594 route->rt_flags &= ~flags; 00595 route->ce_mask |= ROUTE_ATTR_FLAGS; 00596 } 00597 00598 uint32_t rtnl_route_get_flags(struct rtnl_route *route) 00599 { 00600 return route->rt_flags; 00601 } 00602 00603 int rtnl_route_set_metric(struct rtnl_route *route, int metric, uint32_t value) 00604 { 00605 if (metric > RTAX_MAX || metric < 1) 00606 return -NLE_RANGE; 00607 00608 route->rt_metrics[metric - 1] = value; 00609 00610 if (!(route->rt_metrics_mask & (1 << (metric - 1)))) { 00611 route->rt_nmetrics++; 00612 route->rt_metrics_mask |= (1 << (metric - 1)); 00613 } 00614 00615 route->ce_mask |= ROUTE_ATTR_METRICS; 00616 00617 return 0; 00618 } 00619 00620 int rtnl_route_unset_metric(struct rtnl_route *route, int metric) 00621 { 00622 if (metric > RTAX_MAX || metric < 1) 00623 return -NLE_RANGE; 00624 00625 if (route->rt_metrics_mask & (1 << (metric - 1))) { 00626 route->rt_nmetrics--; 00627 route->rt_metrics_mask &= ~(1 << (metric - 1)); 00628 } 00629 00630 return 0; 00631 } 00632 00633 int rtnl_route_get_metric(struct rtnl_route *route, int metric, uint32_t *value) 00634 { 00635 if (metric > RTAX_MAX || metric < 1) 00636 return -NLE_RANGE; 00637 00638 if (!(route->rt_metrics_mask & (1 << (metric - 1)))) 00639 return -NLE_OBJ_NOTFOUND; 00640 00641 if (value) 00642 *value = route->rt_metrics[metric - 1]; 00643 00644 return 0; 00645 } 00646 00647 int rtnl_route_set_pref_src(struct rtnl_route *route, struct nl_addr *addr) 00648 { 00649 if (route->ce_mask & ROUTE_ATTR_FAMILY) { 00650 if (addr->a_family != route->rt_family) 00651 return -NLE_AF_MISMATCH; 00652 } else 00653 route->rt_family = addr->a_family; 00654 00655 if (route->rt_pref_src) 00656 nl_addr_put(route->rt_pref_src); 00657 00658 nl_addr_get(addr); 00659 route->rt_pref_src = addr; 00660 route->ce_mask |= (ROUTE_ATTR_PREF_SRC | ROUTE_ATTR_FAMILY); 00661 00662 return 0; 00663 } 00664 00665 struct nl_addr *rtnl_route_get_pref_src(struct rtnl_route *route) 00666 { 00667 return route->rt_pref_src; 00668 } 00669 00670 void rtnl_route_set_iif(struct rtnl_route *route, int ifindex) 00671 { 00672 route->rt_iif = ifindex; 00673 route->ce_mask |= ROUTE_ATTR_IIF; 00674 } 00675 00676 int rtnl_route_get_iif(struct rtnl_route *route) 00677 { 00678 return route->rt_iif; 00679 } 00680 00681 void rtnl_route_add_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh) 00682 { 00683 nl_list_add_tail(&nh->rtnh_list, &route->rt_nexthops); 00684 route->rt_nr_nh++; 00685 route->ce_mask |= ROUTE_ATTR_MULTIPATH; 00686 } 00687 00688 void rtnl_route_remove_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh) 00689 { 00690 route->rt_nr_nh--; 00691 nl_list_del(&nh->rtnh_list); 00692 } 00693 00694 struct nl_list_head *rtnl_route_get_nexthops(struct rtnl_route *route) 00695 { 00696 return &route->rt_nexthops; 00697 } 00698 00699 int rtnl_route_get_nnexthops(struct rtnl_route *route) 00700 { 00701 return route->rt_nr_nh; 00702 } 00703 00704 void rtnl_route_foreach_nexthop(struct rtnl_route *r, 00705 void (*cb)(struct rtnl_nexthop *, void *), 00706 void *arg) 00707 { 00708 struct rtnl_nexthop *nh; 00709 00710 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) { 00711 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 00712 cb(nh, arg); 00713 } 00714 } 00715 } 00716 00717 struct rtnl_nexthop *rtnl_route_nexthop_n(struct rtnl_route *r, int n) 00718 { 00719 struct rtnl_nexthop *nh; 00720 int i; 00721 00722 if (r->ce_mask & ROUTE_ATTR_MULTIPATH && r->rt_nr_nh > n) { 00723 i = 0; 00724 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) { 00725 if (i == n) return nh; 00726 i++; 00727 } 00728 } 00729 return NULL; 00730 } 00731 00732 /** @} */ 00733 00734 /** 00735 * @name Utilities 00736 * @{ 00737 */ 00738 00739 /** 00740 * Guess scope of a route object. 00741 * @arg route Route object. 00742 * 00743 * Guesses the scope of a route object, based on the following rules: 00744 * @code 00745 * 1) Local route -> local scope 00746 * 2) At least one nexthop not directly connected -> universe scope 00747 * 3) All others -> link scope 00748 * @endcode 00749 * 00750 * @return Scope value. 00751 */ 00752 int rtnl_route_guess_scope(struct rtnl_route *route) 00753 { 00754 if (route->rt_type == RTN_LOCAL) 00755 return RT_SCOPE_HOST; 00756 00757 if (!nl_list_empty(&route->rt_nexthops)) { 00758 struct rtnl_nexthop *nh; 00759 00760 /* 00761 * Use scope uiniverse if there is at least one nexthop which 00762 * is not directly connected 00763 */ 00764 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) { 00765 if (nh->rtnh_gateway) 00766 return RT_SCOPE_UNIVERSE; 00767 } 00768 } 00769 00770 return RT_SCOPE_LINK; 00771 } 00772 00773 /** @} */ 00774 00775 static struct nla_policy route_policy[RTA_MAX+1] = { 00776 [RTA_IIF] = { .type = NLA_U32 }, 00777 [RTA_OIF] = { .type = NLA_U32 }, 00778 [RTA_PRIORITY] = { .type = NLA_U32 }, 00779 [RTA_FLOW] = { .type = NLA_U32 }, 00780 [RTA_CACHEINFO] = { .minlen = sizeof(struct rta_cacheinfo) }, 00781 [RTA_METRICS] = { .type = NLA_NESTED }, 00782 [RTA_MULTIPATH] = { .type = NLA_NESTED }, 00783 }; 00784 00785 static int parse_multipath(struct rtnl_route *route, struct nlattr *attr) 00786 { 00787 struct rtnl_nexthop *nh = NULL; 00788 struct rtnexthop *rtnh = nla_data(attr); 00789 size_t tlen = nla_len(attr); 00790 int err; 00791 00792 while (tlen >= sizeof(*rtnh) && tlen >= rtnh->rtnh_len) { 00793 nh = rtnl_route_nh_alloc(); 00794 if (!nh) 00795 return -NLE_NOMEM; 00796 00797 rtnl_route_nh_set_weight(nh, rtnh->rtnh_hops); 00798 rtnl_route_nh_set_ifindex(nh, rtnh->rtnh_ifindex); 00799 rtnl_route_nh_set_flags(nh, rtnh->rtnh_flags); 00800 00801 if (rtnh->rtnh_len > sizeof(*rtnh)) { 00802 struct nlattr *ntb[RTA_MAX + 1]; 00803 00804 err = nla_parse(ntb, RTA_MAX, (struct nlattr *) 00805 RTNH_DATA(rtnh), 00806 rtnh->rtnh_len - sizeof(*rtnh), 00807 route_policy); 00808 if (err < 0) 00809 goto errout; 00810 00811 if (ntb[RTA_GATEWAY]) { 00812 struct nl_addr *addr; 00813 00814 addr = nl_addr_alloc_attr(ntb[RTA_GATEWAY], 00815 route->rt_family); 00816 if (!addr) { 00817 err = -NLE_NOMEM; 00818 goto errout; 00819 } 00820 00821 rtnl_route_nh_set_gateway(nh, addr); 00822 nl_addr_put(addr); 00823 } 00824 00825 if (ntb[RTA_FLOW]) { 00826 uint32_t realms; 00827 00828 realms = nla_get_u32(ntb[RTA_FLOW]); 00829 rtnl_route_nh_set_realms(nh, realms); 00830 } 00831 } 00832 00833 rtnl_route_add_nexthop(route, nh); 00834 tlen -= RTNH_ALIGN(rtnh->rtnh_len); 00835 rtnh = RTNH_NEXT(rtnh); 00836 } 00837 00838 err = 0; 00839 errout: 00840 if (err && nh) 00841 rtnl_route_nh_free(nh); 00842 00843 return err; 00844 } 00845 00846 int rtnl_route_parse(struct nlmsghdr *nlh, struct rtnl_route **result) 00847 { 00848 struct rtmsg *rtm; 00849 struct rtnl_route *route; 00850 struct nlattr *tb[RTA_MAX + 1]; 00851 struct nl_addr *src = NULL, *dst = NULL, *addr; 00852 struct rtnl_nexthop *old_nh = NULL; 00853 int err, family; 00854 00855 route = rtnl_route_alloc(); 00856 if (!route) { 00857 err = -NLE_NOMEM; 00858 goto errout; 00859 } 00860 00861 route->ce_msgtype = nlh->nlmsg_type; 00862 00863 err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX, route_policy); 00864 if (err < 0) 00865 goto errout; 00866 00867 rtm = nlmsg_data(nlh); 00868 route->rt_family = family = rtm->rtm_family; 00869 route->rt_tos = rtm->rtm_tos; 00870 route->rt_table = rtm->rtm_table; 00871 route->rt_type = rtm->rtm_type; 00872 route->rt_scope = rtm->rtm_scope; 00873 route->rt_protocol = rtm->rtm_protocol; 00874 route->rt_flags = rtm->rtm_flags; 00875 00876 route->ce_mask |= ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS | 00877 ROUTE_ATTR_TABLE | ROUTE_ATTR_TYPE | 00878 ROUTE_ATTR_SCOPE | ROUTE_ATTR_PROTOCOL | 00879 ROUTE_ATTR_FLAGS; 00880 00881 if (tb[RTA_DST]) { 00882 if (!(dst = nl_addr_alloc_attr(tb[RTA_DST], family))) 00883 goto errout_nomem; 00884 } else { 00885 if (!(dst = nl_addr_alloc(0))) 00886 goto errout_nomem; 00887 nl_addr_set_family(dst, rtm->rtm_family); 00888 } 00889 00890 nl_addr_set_prefixlen(dst, rtm->rtm_dst_len); 00891 err = rtnl_route_set_dst(route, dst); 00892 if (err < 0) 00893 goto errout; 00894 00895 nl_addr_put(dst); 00896 00897 if (tb[RTA_SRC]) { 00898 if (!(src = nl_addr_alloc_attr(tb[RTA_SRC], family))) 00899 goto errout_nomem; 00900 } else if (rtm->rtm_src_len) 00901 if (!(src = nl_addr_alloc(0))) 00902 goto errout_nomem; 00903 00904 if (src) { 00905 nl_addr_set_prefixlen(src, rtm->rtm_src_len); 00906 rtnl_route_set_src(route, src); 00907 nl_addr_put(src); 00908 } 00909 00910 if (tb[RTA_IIF]) 00911 rtnl_route_set_iif(route, nla_get_u32(tb[RTA_IIF])); 00912 00913 if (tb[RTA_PRIORITY]) 00914 rtnl_route_set_priority(route, nla_get_u32(tb[RTA_PRIORITY])); 00915 00916 if (tb[RTA_PREFSRC]) { 00917 if (!(addr = nl_addr_alloc_attr(tb[RTA_PREFSRC], family))) 00918 goto errout_nomem; 00919 rtnl_route_set_pref_src(route, addr); 00920 nl_addr_put(addr); 00921 } 00922 00923 if (tb[RTA_METRICS]) { 00924 struct nlattr *mtb[RTAX_MAX + 1]; 00925 int i; 00926 00927 err = nla_parse_nested(mtb, RTAX_MAX, tb[RTA_METRICS], NULL); 00928 if (err < 0) 00929 goto errout; 00930 00931 for (i = 1; i <= RTAX_MAX; i++) { 00932 if (mtb[i] && nla_len(mtb[i]) >= sizeof(uint32_t)) { 00933 uint32_t m = nla_get_u32(mtb[i]); 00934 if (rtnl_route_set_metric(route, i, m) < 0) 00935 goto errout; 00936 } 00937 } 00938 } 00939 00940 if (tb[RTA_MULTIPATH]) 00941 if ((err = parse_multipath(route, tb[RTA_MULTIPATH])) < 0) 00942 goto errout; 00943 00944 if (tb[RTA_CACHEINFO]) { 00945 nla_memcpy(&route->rt_cacheinfo, tb[RTA_CACHEINFO], 00946 sizeof(route->rt_cacheinfo)); 00947 route->ce_mask |= ROUTE_ATTR_CACHEINFO; 00948 } 00949 00950 if (tb[RTA_OIF]) { 00951 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 00952 goto errout; 00953 00954 rtnl_route_nh_set_ifindex(old_nh, nla_get_u32(tb[RTA_OIF])); 00955 } 00956 00957 if (tb[RTA_GATEWAY]) { 00958 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 00959 goto errout; 00960 00961 if (!(addr = nl_addr_alloc_attr(tb[RTA_GATEWAY], family))) 00962 goto errout_nomem; 00963 00964 rtnl_route_nh_set_gateway(old_nh, addr); 00965 nl_addr_put(addr); 00966 } 00967 00968 if (tb[RTA_FLOW]) { 00969 if (!old_nh && !(old_nh = rtnl_route_nh_alloc())) 00970 goto errout; 00971 00972 rtnl_route_nh_set_realms(old_nh, nla_get_u32(tb[RTA_FLOW])); 00973 } 00974 00975 if (old_nh) { 00976 if (route->rt_nr_nh == 0) { 00977 /* If no nexthops have been provided via RTA_MULTIPATH 00978 * we add it as regular nexthop to maintain backwards 00979 * compatibility */ 00980 rtnl_route_add_nexthop(route, old_nh); 00981 } else { 00982 /* Kernel supports new style nexthop configuration, 00983 * verify that it is a duplicate and discard nexthop. */ 00984 struct rtnl_nexthop *first; 00985 00986 first = nl_list_first_entry(&route->rt_nexthops, 00987 struct rtnl_nexthop, 00988 rtnh_list); 00989 if (!first) 00990 BUG(); 00991 00992 if (rtnl_route_nh_compare(old_nh, first, 00993 old_nh->ce_mask, 0)) { 00994 err = -NLE_INVAL; 00995 goto errout; 00996 } 00997 00998 rtnl_route_nh_free(old_nh); 00999 } 01000 } 01001 01002 *result = route; 01003 return 0; 01004 01005 errout: 01006 rtnl_route_put(route); 01007 return err; 01008 01009 errout_nomem: 01010 err = -NLE_NOMEM; 01011 goto errout; 01012 } 01013 01014 int rtnl_route_build_msg(struct nl_msg *msg, struct rtnl_route *route) 01015 { 01016 int i; 01017 struct nlattr *metrics; 01018 struct rtmsg rtmsg = { 01019 .rtm_family = route->rt_family, 01020 .rtm_tos = route->rt_tos, 01021 .rtm_table = route->rt_table, 01022 .rtm_protocol = route->rt_protocol, 01023 .rtm_scope = route->rt_scope, 01024 .rtm_type = route->rt_type, 01025 .rtm_flags = route->rt_flags, 01026 }; 01027 01028 if (route->rt_dst == NULL) 01029 return -NLE_MISSING_ATTR; 01030 01031 rtmsg.rtm_dst_len = nl_addr_get_prefixlen(route->rt_dst); 01032 if (route->rt_src) 01033 rtmsg.rtm_src_len = nl_addr_get_prefixlen(route->rt_src); 01034 01035 01036 if (rtmsg.rtm_scope == RT_SCOPE_NOWHERE) 01037 rtmsg.rtm_scope = rtnl_route_guess_scope(route); 01038 01039 if (nlmsg_append(msg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0) 01040 goto nla_put_failure; 01041 01042 /* Additional table attribute replacing the 8bit in the header, was 01043 * required to allow more than 256 tables. */ 01044 NLA_PUT_U32(msg, RTA_TABLE, route->rt_table); 01045 01046 if (nl_addr_get_len(route->rt_dst)) 01047 NLA_PUT_ADDR(msg, RTA_DST, route->rt_dst); 01048 NLA_PUT_U32(msg, RTA_PRIORITY, route->rt_prio); 01049 01050 if (route->ce_mask & ROUTE_ATTR_SRC) 01051 NLA_PUT_ADDR(msg, RTA_SRC, route->rt_src); 01052 01053 if (route->ce_mask & ROUTE_ATTR_PREF_SRC) 01054 NLA_PUT_ADDR(msg, RTA_PREFSRC, route->rt_pref_src); 01055 01056 if (route->ce_mask & ROUTE_ATTR_IIF) 01057 NLA_PUT_U32(msg, RTA_IIF, route->rt_iif); 01058 01059 if (route->rt_nmetrics > 0) { 01060 uint32_t val; 01061 01062 metrics = nla_nest_start(msg, RTA_METRICS); 01063 if (metrics == NULL) 01064 goto nla_put_failure; 01065 01066 for (i = 1; i <= RTAX_MAX; i++) { 01067 if (!rtnl_route_get_metric(route, i, &val)) 01068 NLA_PUT_U32(msg, i, val); 01069 } 01070 01071 nla_nest_end(msg, metrics); 01072 } 01073 01074 if (rtnl_route_get_nnexthops(route) == 1) { 01075 struct rtnl_nexthop *nh; 01076 nh = nl_list_first_entry(&route->rt_nexthops, 01077 struct rtnl_nexthop, 01078 rtnh_list); 01079 01080 NLA_PUT_U32(msg, RTA_OIF, nh->rtnh_ifindex); 01081 01082 if (nh->rtnh_gateway) 01083 NLA_PUT_ADDR(msg, RTA_GATEWAY, 01084 nh->rtnh_gateway); 01085 } else if (rtnl_route_get_nnexthops(route) > 1) { 01086 struct nlattr *multipath; 01087 struct rtnl_nexthop *nh; 01088 01089 if (!(multipath = nla_nest_start(msg, RTA_MULTIPATH))) 01090 goto nla_put_failure; 01091 01092 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) { 01093 struct rtnexthop *rtnh; 01094 01095 rtnh = nlmsg_reserve(msg, sizeof(*rtnh), NLMSG_ALIGNTO); 01096 if (!rtnh) 01097 goto nla_put_failure; 01098 01099 rtnh->rtnh_flags = nh->rtnh_flags; 01100 rtnh->rtnh_hops = nh->rtnh_weight; 01101 rtnh->rtnh_ifindex = nh->rtnh_ifindex; 01102 01103 if (nh->rtnh_gateway) 01104 NLA_PUT_ADDR(msg, RTA_GATEWAY, 01105 nh->rtnh_gateway); 01106 01107 if (nh->rtnh_realms) 01108 NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms); 01109 01110 rtnh->rtnh_len = nlmsg_tail(msg->nm_nlh) - 01111 (void *) rtnh; 01112 } 01113 01114 nla_nest_end(msg, multipath); 01115 } 01116 01117 return 0; 01118 01119 nla_put_failure: 01120 return -NLE_MSGSIZE; 01121 } 01122 01123 /** @cond SKIP */ 01124 struct nl_object_ops route_obj_ops = { 01125 .oo_name = "route/route", 01126 .oo_size = sizeof(struct rtnl_route), 01127 .oo_constructor = route_constructor, 01128 .oo_free_data = route_free_data, 01129 .oo_clone = route_clone, 01130 .oo_dump = { 01131 [NL_DUMP_LINE] = route_dump_line, 01132 [NL_DUMP_DETAILS] = route_dump_details, 01133 [NL_DUMP_STATS] = route_dump_stats, 01134 }, 01135 .oo_compare = route_compare, 01136 .oo_attrs2str = route_attrs2str, 01137 .oo_id_attrs = (ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS | 01138 ROUTE_ATTR_TABLE | ROUTE_ATTR_DST), 01139 }; 01140 /** @endcond */ 01141 01142 /** @} */