net/tipc/diag.c

0001 /*
0002  * net/tipc/diag.c: TIPC socket diag
0003  *
0004  * Copyright (c) 2018, Ericsson AB
0005  * All rights reserved.
0006  *
0007  * Redistribution and use in source and binary forms, with or without
0008  * modification, are permitted provided that the following conditions are met:
0009  *
0010  * 1. Redistributions of source code must retain the above copyright
0011  *    notice, this list of conditions and the following disclaimer.
0012  * 2. Redistributions in binary form must reproduce the above copyright
0013  *    notice, this list of conditions and the following disclaimer in the
0014  *    documentation and/or other materials provided with the distribution.
0015  * 3. Neither the names of the copyright holders nor the names of its
0016  *    contributors may be used to endorse or promote products derived from
0017  *    this software without specific prior written permission.
0018  *
0019  * Alternatively, this software may be distributed under the terms of the
0020  * GNU General Public License ("GPL") version 2 as published by the Free
0021  * Software Foundation.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "ASIS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #include "core.h"
0037 #include "socket.h"
0038 #include <linux/sock_diag.h>
0039 #include <linux/tipc_sockets_diag.h>
0040
0041 static u64 __tipc_diag_gen_cookie(struct sock *sk)
0042 {
0043     u32 res[2];
0044
0045     sock_diag_save_cookie(sk, res);
0046     return *((u64 *)res);
0047 }
0048
0049 static int __tipc_add_sock_diag(struct sk_buff *skb,
0050                 struct netlink_callback *cb,
0051                 struct tipc_sock *tsk)
0052 {
0053     struct tipc_sock_diag_req *req = nlmsg_data(cb->nlh);
0054     struct nlmsghdr *nlh;
0055     int err;
0056
0057     nlh = nlmsg_put_answer(skb, cb, SOCK_DIAG_BY_FAMILY, 0,
0058                    NLM_F_MULTI);
0059     if (!nlh)
0060         return -EMSGSIZE;
0061
0062     err = tipc_sk_fill_sock_diag(skb, cb, tsk, req->tidiag_states,
0063                      __tipc_diag_gen_cookie);
0064     if (err)
0065         return err;
0066
0067     nlmsg_end(skb, nlh);
0068     return 0;
0069 }
0070
0071 static int tipc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
0072 {
0073     return tipc_nl_sk_walk(skb, cb, __tipc_add_sock_diag);
0074 }
0075
0076 static int tipc_sock_diag_handler_dump(struct sk_buff *skb,
0077                        struct nlmsghdr *h)
0078 {
0079     int hdrlen = sizeof(struct tipc_sock_diag_req);
0080     struct net *net = sock_net(skb->sk);
0081
0082     if (nlmsg_len(h) < hdrlen)
0083         return -EINVAL;
0084
0085     if (h->nlmsg_flags & NLM_F_DUMP) {
0086         struct netlink_dump_control c = {
0087             .start = tipc_dump_start,
0088             .dump = tipc_diag_dump,
0089             .done = tipc_dump_done,
0090         };
0091         netlink_dump_start(net->diag_nlsk, skb, h, &c);
0092         return 0;
0093     }
0094     return -EOPNOTSUPP;
0095 }
0096
0097 static const struct sock_diag_handler tipc_sock_diag_handler = {
0098     .family = AF_TIPC,
0099     .dump = tipc_sock_diag_handler_dump,
0100 };
0101
0102 static int __init tipc_diag_init(void)
0103 {
0104     return sock_diag_register(&tipc_sock_diag_handler);
0105 }
0106
0107 static void __exit tipc_diag_exit(void)
0108 {
0109     sock_diag_unregister(&tipc_sock_diag_handler);
0110 }
0111
0112 module_init(tipc_diag_init);
0113 module_exit(tipc_diag_exit);
0114
0115 MODULE_LICENSE("Dual BSD/GPL");
0116 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);