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);