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
28 static struct nl_cache_ops rtnl_route_ops;
29
route_msg_parser(struct nl_cache_ops * ops,struct sockaddr_nl * who,struct nlmsghdr * nlh,struct nl_parser_param * pp)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
route_request_update(struct nl_cache * c,struct nl_sock * h)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 */
rtnl_route_alloc_cache(struct nl_sock * sk,int family,int flags,struct nl_cache ** result)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
build_route_msg(struct rtnl_route * tmpl,int cmd,int flags,struct nl_msg ** result)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
rtnl_route_build_add_request(struct rtnl_route * tmpl,int flags,struct nl_msg ** result)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
rtnl_route_add(struct nl_sock * sk,struct rtnl_route * route,int flags)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
rtnl_route_build_del_request(struct rtnl_route * tmpl,int flags,struct nl_msg ** result)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
rtnl_route_delete(struct nl_sock * sk,struct rtnl_route * route,int flags)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
route_init(void)191 static void __init route_init(void)
192 {
193 nl_cache_mngt_register(&rtnl_route_ops);
194 }
195
route_exit(void)196 static void __exit route_exit(void)
197 {
198 nl_cache_mngt_unregister(&rtnl_route_ops);
199 }
200
201 /** @} */
202