LXR linux/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
  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        .family = AF_TIPC,
  99        .dump = tipc_sock_diag_handler_dump,
 100};
 101
 102static int __init tipc_diag_init(void)
 103{
 104        return sock_diag_register(&tipc_sock_diag_handler);
 105}
 106
 107static void __exit tipc_diag_exit(void)
 108{
 109        sock_diag_unregister(&tipc_sock_diag_handler);
 110}
 111
 112module_init(tipc_diag_init);
 113module_exit(tipc_diag_exit);
 114
 115MODULE_LICENSE("Dual BSD/GPL");
 116MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);
 117