route.c revision cfcfca070355b246028df60da79813f09ed65755 
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@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
28static struct nl_cache_ops rtnl_route_ops;
29
30static 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
45static 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 */
75int 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
103static 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
121int 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
128int 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
144int 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
150int 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
168static 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
175static 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
191static void __init route_init(void)
192{
193	nl_cache_mngt_register(&rtnl_route_ops);
194}
195
196static void __exit route_exit(void)
197{
198	nl_cache_mngt_unregister(&rtnl_route_ops);
199}
200
201/** @} */
202