1/*
2 * net/tipc/diag.c: TIPC socket diag
3 *
4 * Copyright (c) 2018, Ericsson AB
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the names of the copyright holders nor the names of its
16 *    contributors may be used to endorse or promote products derived from
17 *    this software without specific prior written permission.
18 *
19 * Alternatively, this software may be distributed under the terms of the
20 * GNU General Public License ("GPL") version 2 as published by the Free
21 * Software Foundation.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "ASIS"
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#include "core.h"
37#include "socket.h"
38#include <linux/sock_diag.h>
39#include <linux/tipc_sockets_diag.h>
40
41static u64 __tipc_diag_gen_cookie(struct sock *sk)
42{
43	u32 res[2];
44
45	sock_diag_save_cookie(sk, res);
46	return *((u64 *)res);
47}
48
49static int __tipc_add_sock_diag(struct sk_buff *skb,
50				struct netlink_callback *cb,
51				struct tipc_sock *tsk)
52{
53	struct tipc_sock_diag_req *req = nlmsg_data(cb->nlh);
54	struct nlmsghdr *nlh;
55	int err;
56
57	nlh = nlmsg_put_answer(skb, cb, SOCK_DIAG_BY_FAMILY, 0,
58			       NLM_F_MULTI);
59	if (!nlh)
60		return -EMSGSIZE;
61
62	err = tipc_sk_fill_sock_diag(skb, cb, tsk, req->tidiag_states,
63				     __tipc_diag_gen_cookie);
64	if (err)
65		return err;
66
67	nlmsg_end(skb, nlh);
68	return 0;
69}
70
71static int tipc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
72{
73	return tipc_nl_sk_walk(skb, cb, __tipc_add_sock_diag);
74}
75
76static int tipc_sock_diag_handler_dump(struct sk_buff *skb,
77				       struct nlmsghdr *h)
78{
79	int hdrlen = sizeof(struct tipc_sock_diag_req);
80	struct net *net = sock_net(skb->sk);
81
82	if (nlmsg_len(h) < hdrlen)
83		return -EINVAL;
84
85	if (h->nlmsg_flags & NLM_F_DUMP) {
86		struct netlink_dump_control c = {
87			.start = tipc_dump_start,
88			.dump = tipc_diag_dump,
89			.done = tipc_dump_done,
90		};
91		netlink_dump_start(net->diag_nlsk, skb, h, &c);
92		return 0;
93	}
94	return -EOPNOTSUPP;
95}
96
97static const struct sock_diag_handler tipc_sock_diag_handler = {
98	.owner = THIS_MODULE,
99	.family = AF_TIPC,
100	.dump = tipc_sock_diag_handler_dump,
101};
102
103static int __init tipc_diag_init(void)
104{
105	return sock_diag_register(&tipc_sock_diag_handler);
106}
107
108static void __exit tipc_diag_exit(void)
109{
110	sock_diag_unregister(&tipc_sock_diag_handler);
111}
112
113module_init(tipc_diag_init);
114module_exit(tipc_diag_exit);
115
116MODULE_LICENSE("Dual BSD/GPL");
117MODULE_DESCRIPTION("TIPC socket monitoring via SOCK_DIAG");
118MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);
119