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(buf: rxrpc_version_string, size: sizeof(rxrpc_version_string),
27 fmt: "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(sock: local->socket, msg: &msg, vec: iov, num: 2, len);
76 if (ret < 0)
77 trace_rxrpc_tx_fail(debug_id: local->debug_id, serial: 0, ret,
78 where: rxrpc_tx_point_version_reply);
79 else
80 trace_rxrpc_tx_packet(call_id: local->debug_id, whdr: &whdr,
81 where: rxrpc_tx_point_version_reply);
82
83 _leave("");
84}
85

source code of linux/net/rxrpc/local_event.c