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b97bf3fd PL |
1 | /* |
2 | * net/tipc/netlink.c: TIPC configuration handling | |
3 | * | |
593a5f22 | 4 | * Copyright (c) 2005-2006, Ericsson AB |
b97bf3fd | 5 | * Copyright (c) 2005, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
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11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
38 | #include "config.h" | |
39 | #include <net/genetlink.h> | |
40 | ||
41 | static int handle_cmd(struct sk_buff *skb, struct genl_info *info) | |
42 | { | |
43 | struct sk_buff *rep_buf; | |
44 | struct nlmsghdr *rep_nlh; | |
45 | struct nlmsghdr *req_nlh = info->nlhdr; | |
46 | struct tipc_genlmsghdr *req_userhdr = info->userhdr; | |
1dba9743 | 47 | int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN); |
b97bf3fd PL |
48 | |
49 | if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN))) | |
50 | rep_buf = cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN); | |
51 | else | |
52 | rep_buf = cfg_do_cmd(req_userhdr->dest, | |
53 | req_userhdr->cmd, | |
54 | NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, | |
55 | NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), | |
56 | hdr_space); | |
57 | ||
58 | if (rep_buf) { | |
59 | skb_push(rep_buf, hdr_space); | |
60 | rep_nlh = (struct nlmsghdr *)rep_buf->data; | |
61 | memcpy(rep_nlh, req_nlh, hdr_space); | |
62 | rep_nlh->nlmsg_len = rep_buf->len; | |
63 | genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid); | |
64 | } | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static struct genl_family family = { | |
1dba9743 | 70 | .id = GENL_ID_GENERATE, |
b97bf3fd PL |
71 | .name = TIPC_GENL_NAME, |
72 | .version = TIPC_GENL_VERSION, | |
73 | .hdrsize = TIPC_GENL_HDRLEN, | |
74 | .maxattr = 0, | |
75 | .owner = THIS_MODULE, | |
76 | }; | |
77 | ||
78 | static struct genl_ops ops = { | |
79 | .cmd = TIPC_GENL_CMD, | |
80 | .doit = handle_cmd, | |
81 | }; | |
82 | ||
83 | static int family_registered = 0; | |
84 | ||
85 | int netlink_start(void) | |
86 | { | |
b70e4f45 JM |
87 | |
88 | ||
b97bf3fd PL |
89 | if (genl_register_family(&family)) |
90 | goto err; | |
91 | ||
92 | family_registered = 1; | |
93 | ||
94 | if (genl_register_ops(&family, &ops)) | |
95 | goto err_unregister; | |
96 | ||
b70e4f45 | 97 | return 0; |
b97bf3fd PL |
98 | |
99 | err_unregister: | |
100 | genl_unregister_family(&family); | |
101 | family_registered = 0; | |
102 | err: | |
d0a14a9d | 103 | err("Failed to register netlink interface\n"); |
b97bf3fd PL |
104 | return -EFAULT; |
105 | } | |
106 | ||
107 | void netlink_stop(void) | |
108 | { | |
109 | if (family_registered) { | |
110 | genl_unregister_family(&family); | |
111 | family_registered = 0; | |
112 | } | |
113 | } |