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c30b70deb5
This commit adds socket diagnostics capability for AF_TIPC in netlink family NETLINK_SOCK_DIAG in a new kernel module (diag.ko). The following are key design considerations: - config TIPC_DIAG has default y, like INET_DIAG. - only requests with flag NLM_F_DUMP is supported (dump all). - tipc_sock_diag_req message is introduced to send filter parameters. - the response attributes are of TLV, some nested. To avoid exposing data structures between diag and tipc modules and avoid code duplication, the following additions are required: - export tipc_nl_sk_walk function to reuse socket iterator. - export tipc_sk_fill_sock_diag to fill the tipc diag attributes. - create a sock_diag response message in __tipc_add_sock_diag defined in diag.c and use the above exported tipc_sk_fill_sock_diag to fill response. Acked-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
115 lines
3.4 KiB
C
115 lines
3.4 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, 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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.dump = tipc_diag_dump,
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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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.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_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, AF_TIPC);
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