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 char rxrpc_version_string[65]; // "linux-" UTS_RELEASE " AF_RXRPC";
20
21/*
22 * Generate the VERSION packet string.
23 */
24void rxrpc_gen_version_string(void)
25{
26	snprintf(rxrpc_version_string, sizeof(rxrpc_version_string),
27		 "linux-%.49s AF_RXRPC", UTS_RELEASE);
28}
29
30/*
31 * Reply to a version request
32 */
33void rxrpc_send_version_request(struct rxrpc_local *local,
34				struct rxrpc_host_header *hdr,
35				struct sk_buff *skb)
36{
37	struct rxrpc_wire_header whdr;
38	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
39	struct sockaddr_rxrpc srx;
40	struct msghdr msg;
41	struct kvec iov[2];
42	size_t len;
43	int ret;
44
45	_enter("");
46
47	if (rxrpc_extract_addr_from_skb(&srx, skb) < 0)
48		return;
49
50	msg.msg_name	= &srx.transport;
51	msg.msg_namelen	= srx.transport_len;
52	msg.msg_control	= NULL;
53	msg.msg_controllen = 0;
54	msg.msg_flags	= 0;
55
56	whdr.epoch	= htonl(sp->hdr.epoch);
57	whdr.cid	= htonl(sp->hdr.cid);
58	whdr.callNumber	= htonl(sp->hdr.callNumber);
59	whdr.seq	= 0;
60	whdr.serial	= 0;
61	whdr.type	= RXRPC_PACKET_TYPE_VERSION;
62	whdr.flags	= RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
63	whdr.userStatus	= 0;
64	whdr.securityIndex = 0;
65	whdr._rsvd	= 0;
66	whdr.serviceId	= htons(sp->hdr.serviceId);
67
68	iov[0].iov_base	= &whdr;
69	iov[0].iov_len	= sizeof(whdr);
70	iov[1].iov_base	= (char *)rxrpc_version_string;
71	iov[1].iov_len	= sizeof(rxrpc_version_string);
72
73	len = iov[0].iov_len + iov[1].iov_len;
74
75	ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
76	if (ret < 0)
77		trace_rxrpc_tx_fail(local->debug_id, 0, ret,
78				    rxrpc_tx_point_version_reply);
79	else
80		trace_rxrpc_tx_packet(local->debug_id, &whdr,
81				      rxrpc_tx_point_version_reply);
82
83	_leave("");
84}
85