net/tipc/diag.c

   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
  41 static 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
  49 static 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
  71 static 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
  76 static 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
  97 static const struct sock_diag_handler tipc_sock_diag_handler = {
  98         .family = AF_TIPC,
  99         .dump = tipc_sock_diag_handler_dump,
 100 };
 101
 102 static int __init tipc_diag_init(void)
 103 {
 104         return sock_diag_register(&tipc_sock_diag_handler);
 105 }
 106
 107 static void __exit tipc_diag_exit(void)
 108 {
 109         sock_diag_unregister(&tipc_sock_diag_handler);
 110 }
 111
 112 module_init(tipc_diag_init);
 113 module_exit(tipc_diag_exit);
 114
 115 MODULE_LICENSE("Dual BSD/GPL");
 116 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);