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