1 /* 2 * lib/route/route.c Routes 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 (at) suug.ch> 10 */ 11 12 /** 13 * @ingroup rtnl 14 * @defgroup route Routing 15 * @brief 16 * @{ 17 */ 18 19 #include <netlink-local.h> 20 #include <netlink/netlink.h> 21 #include <netlink/cache.h> 22 #include <netlink/utils.h> 23 #include <netlink/data.h> 24 #include <netlink/route/rtnl.h> 25 #include <netlink/route/route.h> 26 #include <netlink/route/link.h> 27 28 static struct nl_cache_ops rtnl_route_ops; 29 30 static int route_msg_parser(struct nl_cache_ops *ops, struct sockaddr_nl *who, 31 struct nlmsghdr *nlh, struct nl_parser_param *pp) 32 { 33 struct rtnl_route *route; 34 int err; 35 36 if ((err = rtnl_route_parse(nlh, &route)) < 0) 37 return err; 38 39 err = pp->pp_cb((struct nl_object *) route, pp); 40 41 rtnl_route_put(route); 42 return err; 43 } 44 45 static int route_request_update(struct nl_cache *c, struct nl_sock *h) 46 { 47 struct rtmsg rhdr = { 48 .rtm_family = c->c_iarg1, 49 }; 50 51 if (c->c_iarg2 & ROUTE_CACHE_CONTENT) 52 rhdr.rtm_flags |= RTM_F_CLONED; 53 54 return nl_send_simple(h, RTM_GETROUTE, NLM_F_DUMP, &rhdr, sizeof(rhdr)); 55 } 56 57 /** 58 * @name Cache Management 59 * @{ 60 */ 61 62 /** 63 * Build a route cache holding all routes currently configured in the kernel 64 * @arg sk Netlink socket. 65 * @arg family Address family of routes to cover or AF_UNSPEC 66 * @arg flags Flags 67 * 68 * Allocates a new cache, initializes it properly and updates it to 69 * contain all routes currently configured in the kernel. 70 * 71 * @note The caller is responsible for destroying and freeing the 72 * cache after using it. 73 * @return The cache or NULL if an error has occured. 74 */ 75 int rtnl_route_alloc_cache(struct nl_sock *sk, int family, int flags, 76 struct nl_cache **result) 77 { 78 struct nl_cache *cache; 79 int err; 80 81 if (!(cache = nl_cache_alloc(&rtnl_route_ops))) 82 return -NLE_NOMEM; 83 84 cache->c_iarg1 = family; 85 cache->c_iarg2 = flags; 86 87 if (sk && (err = nl_cache_refill(sk, cache)) < 0) { 88 free(cache); 89 return err; 90 } 91 92 *result = cache; 93 return 0; 94 } 95 96 /** @} */ 97 98 /** 99 * @name Route Addition 100 * @{ 101 */ 102 103 static int build_route_msg(struct rtnl_route *tmpl, int cmd, int flags, 104 struct nl_msg **result) 105 { 106 struct nl_msg *msg; 107 int err; 108 109 if (!(msg = nlmsg_alloc_simple(cmd, flags))) 110 return -NLE_NOMEM; 111 112 if ((err = rtnl_route_build_msg(msg, tmpl)) < 0) { 113 nlmsg_free(msg); 114 return err; 115 } 116 117 *result = msg; 118 return 0; 119 } 120 121 int rtnl_route_build_add_request(struct rtnl_route *tmpl, int flags, 122 struct nl_msg **result) 123 { 124 return build_route_msg(tmpl, RTM_NEWROUTE, NLM_F_CREATE | flags, 125 result); 126 } 127 128 int rtnl_route_add(struct nl_sock *sk, struct rtnl_route *route, int flags) 129 { 130 struct nl_msg *msg; 131 int err; 132 133 if ((err = rtnl_route_build_add_request(route, flags, &msg)) < 0) 134 return err; 135 136 err = nl_send_auto_complete(sk, msg); 137 nlmsg_free(msg); 138 if (err < 0) 139 return err; 140 141 return wait_for_ack(sk); 142 } 143 144 int rtnl_route_build_del_request(struct rtnl_route *tmpl, int flags, 145 struct nl_msg **result) 146 { 147 return build_route_msg(tmpl, RTM_DELROUTE, flags, result); 148 } 149 150 int rtnl_route_delete(struct nl_sock *sk, struct rtnl_route *route, int flags) 151 { 152 struct nl_msg *msg; 153 int err; 154 155 if ((err = rtnl_route_build_del_request(route, flags, &msg)) < 0) 156 return err; 157 158 err = nl_send_auto_complete(sk, msg); 159 nlmsg_free(msg); 160 if (err < 0) 161 return err; 162 163 return wait_for_ack(sk); 164 } 165 166 /** @} */ 167 168 static struct nl_af_group route_groups[] = { 169 { AF_INET, RTNLGRP_IPV4_ROUTE }, 170 { AF_INET6, RTNLGRP_IPV6_ROUTE }, 171 { AF_DECnet, RTNLGRP_DECnet_ROUTE }, 172 { END_OF_GROUP_LIST }, 173 }; 174 175 static struct nl_cache_ops rtnl_route_ops = { 176 .co_name = "route/route", 177 .co_hdrsize = sizeof(struct rtmsg), 178 .co_msgtypes = { 179 { RTM_NEWROUTE, NL_ACT_NEW, "new" }, 180 { RTM_DELROUTE, NL_ACT_DEL, "del" }, 181 { RTM_GETROUTE, NL_ACT_GET, "get" }, 182 END_OF_MSGTYPES_LIST, 183 }, 184 .co_protocol = NETLINK_ROUTE, 185 .co_groups = route_groups, 186 .co_request_update = route_request_update, 187 .co_msg_parser = route_msg_parser, 188 .co_obj_ops = &route_obj_ops, 189 }; 190 191 static void __init route_init(void) 192 { 193 nl_cache_mngt_register(&rtnl_route_ops); 194 } 195 196 static void __exit route_exit(void) 197 { 198 nl_cache_mngt_unregister(&rtnl_route_ops); 199 } 200 201 /** @} */ 202
