1// SPDX-License-Identifier: GPL-2.0-or-later
 2/* AF_RXRPC local endpoint management
 3 *
 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 5 * Written by David Howells (dhowells@redhat.com)
 6 */
 7
 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 9
10#include <linux/module.h>
11#include <linux/net.h>
12#include <linux/skbuff.h>
13#include <linux/slab.h>
14#include <net/sock.h>
15#include <net/af_rxrpc.h>
16#include <generated/utsrelease.h>
17#include "ar-internal.h"
18
19static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
20
21/*
22 * Reply to a version request
23 */
24void rxrpc_send_version_request(struct rxrpc_local *local,
25				struct rxrpc_host_header *hdr,
26				struct sk_buff *skb)
27{
28	struct rxrpc_wire_header whdr;
29	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
30	struct sockaddr_rxrpc srx;
31	struct msghdr msg;
32	struct kvec iov[2];
33	size_t len;
34	int ret;
35
36	_enter("");
37
38	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
39		return;
40
41	msg.msg_name	= &srx.transport;
42	msg.msg_namelen	= srx.transport_len;
43	msg.msg_control	= NULL;
44	msg.msg_controllen = 0;
45	msg.msg_flags	= 0;
46
47	whdr.epoch	= htonl(sp->hdr.epoch);
48	whdr.cid	= htonl(sp->hdr.cid);
49	whdr.callNumber	= htonl(sp->hdr.callNumber);
50	whdr.seq	= 0;
51	whdr.serial	= 0;
52	whdr.type	= RXRPC_PACKET_TYPE_VERSION;
53	whdr.flags	= RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
54	whdr.userStatus	= 0;
55	whdr.securityIndex = 0;
56	whdr._rsvd	= 0;
57	whdr.serviceId	= htons(sp->hdr.serviceId);
58
59	iov[0].iov_base	= &whdr;
60	iov[0].iov_len	= sizeof(whdr);
61	iov[1].iov_base	= (char *)rxrpc_version_string;
62	iov[1].iov_len	= sizeof(rxrpc_version_string);
63
64	len = iov[0].iov_len + iov[1].iov_len;
65
66	ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
67	if (ret < 0)
68		trace_rxrpc_tx_fail(local->debug_id, 0, ret,
69				    rxrpc_tx_point_version_reply);
70	else
71		trace_rxrpc_tx_packet(local->debug_id, &whdr,
72				      rxrpc_tx_point_version_reply);
73
74	_leave("");
75}