forked from mirrors/linux
114b4bb1cc
Following patch is going to use RCU instead of sock_diag_table_mutex acquisition. This patch is a preparation, no change of behavior yet. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Guillaume Nault <gnault@redhat.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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* net/tipc/diag.c: TIPC socket diag
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*
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* Copyright (c) 2018, Ericsson AB
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "ASIS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "socket.h"
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#include <linux/sock_diag.h>
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#include <linux/tipc_sockets_diag.h>
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static u64 __tipc_diag_gen_cookie(struct sock *sk)
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{
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u32 res[2];
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sock_diag_save_cookie(sk, res);
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return *((u64 *)res);
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}
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static int __tipc_add_sock_diag(struct sk_buff *skb,
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struct netlink_callback *cb,
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struct tipc_sock *tsk)
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{
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struct tipc_sock_diag_req *req = nlmsg_data(cb->nlh);
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struct nlmsghdr *nlh;
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int err;
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nlh = nlmsg_put_answer(skb, cb, SOCK_DIAG_BY_FAMILY, 0,
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NLM_F_MULTI);
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if (!nlh)
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return -EMSGSIZE;
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err = tipc_sk_fill_sock_diag(skb, cb, tsk, req->tidiag_states,
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__tipc_diag_gen_cookie);
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if (err)
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return err;
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nlmsg_end(skb, nlh);
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return 0;
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}
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static int tipc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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return tipc_nl_sk_walk(skb, cb, __tipc_add_sock_diag);
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}
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static int tipc_sock_diag_handler_dump(struct sk_buff *skb,
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struct nlmsghdr *h)
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{
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int hdrlen = sizeof(struct tipc_sock_diag_req);
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struct net *net = sock_net(skb->sk);
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if (nlmsg_len(h) < hdrlen)
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return -EINVAL;
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if (h->nlmsg_flags & NLM_F_DUMP) {
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struct netlink_dump_control c = {
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.start = tipc_dump_start,
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.dump = tipc_diag_dump,
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.done = tipc_dump_done,
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};
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netlink_dump_start(net->diag_nlsk, skb, h, &c);
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return 0;
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}
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return -EOPNOTSUPP;
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}
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static const struct sock_diag_handler tipc_sock_diag_handler = {
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.owner = THIS_MODULE,
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.family = AF_TIPC,
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.dump = tipc_sock_diag_handler_dump,
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};
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static int __init tipc_diag_init(void)
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{
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return sock_diag_register(&tipc_sock_diag_handler);
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}
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static void __exit tipc_diag_exit(void)
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{
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sock_diag_unregister(&tipc_sock_diag_handler);
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}
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module_init(tipc_diag_init);
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module_exit(tipc_diag_exit);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION("TIPC socket monitoring via SOCK_DIAG");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);
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