1 /*
2 * lib/route/link/api.c Link Info API
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 link
14 * @defgroup link_info Link Info API
15 * @brief
16 *
17 * @par 1) Registering/Unregistering a new link info type
18 * @code
19 * static struct rtnl_link_info_ops vlan_info_ops = {
20 * .io_name = "vlan",
21 * .io_alloc = vlan_alloc,
22 * .io_parse = vlan_parse,
23 * .io_dump[NL_DUMP_BRIEF] = vlan_dump_brief,
24 * .io_dump[NL_DUMP_FULL] = vlan_dump_full,
25 * .io_free = vlan_free,
26 * };
27 *
28 * static void __init vlan_init(void)
29 * {
30 * rtnl_link_register_info(&vlan_info_ops);
31 * }
32 *
33 * static void __exit vlan_exit(void)
34 * {
35 * rtnl_link_unregister_info(&vlan_info_ops);
36 * }
37 * @endcode
38 *
39 * @{
40 */
41
42 #include <netlink-local.h>
43 #include <netlink/netlink.h>
44 #include <netlink/utils.h>
45 #include <netlink/route/link.h>
46 #include <netlink/route/link/info-api.h>
47
48 static struct rtnl_link_info_ops *info_ops;
49
rtnl_link_info_ops_lookup(const char * name)50 struct rtnl_link_info_ops *rtnl_link_info_ops_lookup(const char *name)
51 {
52 struct rtnl_link_info_ops *ops;
53
54 for (ops = info_ops; ops; ops = ops->io_next)
55 if (!strcmp(ops->io_name, name))
56 return ops;
57
58 return NULL;
59 }
60
rtnl_link_register_info(struct rtnl_link_info_ops * ops)61 int rtnl_link_register_info(struct rtnl_link_info_ops *ops)
62 {
63 if (ops->io_name == NULL)
64 return -NLE_INVAL;
65
66 if (rtnl_link_info_ops_lookup(ops->io_name))
67 return -NLE_EXIST;
68
69 NL_DBG(1, "Registered link info operations %s\n", ops->io_name);
70
71 ops->io_next = info_ops;
72 info_ops = ops;
73
74 return 0;
75 }
76
rtnl_link_unregister_info(struct rtnl_link_info_ops * ops)77 int rtnl_link_unregister_info(struct rtnl_link_info_ops *ops)
78 {
79 struct rtnl_link_info_ops *t, **tp;
80
81 for (tp = &info_ops; (t=*tp) != NULL; tp = &t->io_next)
82 if (t == ops)
83 break;
84
85 if (!t)
86 return -NLE_OPNOTSUPP;
87
88 if (t->io_refcnt > 0)
89 return -NLE_BUSY;
90
91 NL_DBG(1, "Unregistered link info perations %s\n", ops->io_name);
92
93 *tp = t->io_next;
94 return 0;
95 }
96
97 /** @} */
98
99