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-private/netlink.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 * @arg result Result pointer
68 *
69 * Allocates a new cache, initializes it properly and updates it to
70 * contain all routes currently configured in the kernel.
71 *
72 * Valid flags:
73 * * ROUTE_CACHE_CONTENT - Cache will contain contents of routing cache
74 * instead of actual routes.
75 *
76 * @note The caller is responsible for destroying and freeing the
77 * cache after using it.
78 * @return 0 on success or a negative error code.
79 */
rtnl_route_alloc_cache(struct nl_sock * sk,int family,int flags,struct nl_cache ** result)80 int rtnl_route_alloc_cache(struct nl_sock *sk, int family, int flags,
81 struct nl_cache **result)
82 {
83 struct nl_cache *cache;
84 int err;
85
86 if (!(cache = nl_cache_alloc(&rtnl_route_ops)))
87 return -NLE_NOMEM;
88
89 cache->c_iarg1 = family;
90 cache->c_iarg2 = flags;
91
92 if (sk && (err = nl_cache_refill(sk, cache)) < 0) {
93 free(cache);
94 return err;
95 }
96
97 *result = cache;
98 return 0;
99 }
100
101 /** @} */
102
103 /**
104 * @name Route Addition
105 * @{
106 */
107
build_route_msg(struct rtnl_route * tmpl,int cmd,int flags,struct nl_msg ** result)108 static int build_route_msg(struct rtnl_route *tmpl, int cmd, int flags,
109 struct nl_msg **result)
110 {
111 struct nl_msg *msg;
112 int err;
113
114 if (!(msg = nlmsg_alloc_simple(cmd, flags)))
115 return -NLE_NOMEM;
116
117 if ((err = rtnl_route_build_msg(msg, tmpl)) < 0) {
118 nlmsg_free(msg);
119 return err;
120 }
121
122 *result = msg;
123 return 0;
124 }
125
rtnl_route_build_add_request(struct rtnl_route * tmpl,int flags,struct nl_msg ** result)126 int rtnl_route_build_add_request(struct rtnl_route *tmpl, int flags,
127 struct nl_msg **result)
128 {
129 return build_route_msg(tmpl, RTM_NEWROUTE, NLM_F_CREATE | flags,
130 result);
131 }
132
rtnl_route_add(struct nl_sock * sk,struct rtnl_route * route,int flags)133 int rtnl_route_add(struct nl_sock *sk, struct rtnl_route *route, int flags)
134 {
135 struct nl_msg *msg;
136 int err;
137
138 if ((err = rtnl_route_build_add_request(route, flags, &msg)) < 0)
139 return err;
140
141 err = nl_send_auto_complete(sk, msg);
142 nlmsg_free(msg);
143 if (err < 0)
144 return err;
145
146 return wait_for_ack(sk);
147 }
148
rtnl_route_build_del_request(struct rtnl_route * tmpl,int flags,struct nl_msg ** result)149 int rtnl_route_build_del_request(struct rtnl_route *tmpl, int flags,
150 struct nl_msg **result)
151 {
152 return build_route_msg(tmpl, RTM_DELROUTE, flags, result);
153 }
154
rtnl_route_delete(struct nl_sock * sk,struct rtnl_route * route,int flags)155 int rtnl_route_delete(struct nl_sock *sk, struct rtnl_route *route, int flags)
156 {
157 struct nl_msg *msg;
158 int err;
159
160 if ((err = rtnl_route_build_del_request(route, flags, &msg)) < 0)
161 return err;
162
163 err = nl_send_auto_complete(sk, msg);
164 nlmsg_free(msg);
165 if (err < 0)
166 return err;
167
168 return wait_for_ack(sk);
169 }
170
171 /** @} */
172
173 static struct nl_af_group route_groups[] = {
174 { AF_INET, RTNLGRP_IPV4_ROUTE },
175 { AF_INET6, RTNLGRP_IPV6_ROUTE },
176 { AF_DECnet, RTNLGRP_DECnet_ROUTE },
177 { END_OF_GROUP_LIST },
178 };
179
180 static struct nl_cache_ops rtnl_route_ops = {
181 .co_name = "route/route",
182 .co_hdrsize = sizeof(struct rtmsg),
183 .co_msgtypes = {
184 { RTM_NEWROUTE, NL_ACT_NEW, "new" },
185 { RTM_DELROUTE, NL_ACT_DEL, "del" },
186 { RTM_GETROUTE, NL_ACT_GET, "get" },
187 END_OF_MSGTYPES_LIST,
188 },
189 .co_protocol = NETLINK_ROUTE,
190 .co_groups = route_groups,
191 .co_request_update = route_request_update,
192 .co_msg_parser = route_msg_parser,
193 .co_obj_ops = &route_obj_ops,
194 };
195
route_init(void)196 static void __init route_init(void)
197 {
198 nl_cache_mngt_register(&rtnl_route_ops);
199 }
200
route_exit(void)201 static void __exit route_exit(void)
202 {
203 nl_cache_mngt_unregister(&rtnl_route_ops);
204 }
205
206 /** @} */
207