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 */
24static void 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	_proto("Tx VERSION (reply)");
67
68	ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
69	if (ret < 0)
70		trace_rxrpc_tx_fail(local->debug_id, 0, ret,
71				    rxrpc_tx_point_version_reply);
72	else
73		trace_rxrpc_tx_packet(local->debug_id, &whdr,
74				      rxrpc_tx_point_version_reply);
75
76	_leave("");
77}
78
79/*
80 * Process event packets targetted at a local endpoint.
81 */
82void rxrpc_process_local_events(struct rxrpc_local *local)
83{
84	struct sk_buff *skb;
85	char v;
86
87	_enter("");
88
89	skb = skb_dequeue(&local->event_queue);
90	if (skb) {
91		struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
92
93		rxrpc_see_skb(skb, rxrpc_skb_seen);
94		_debug("{%d},{%u}", local->debug_id, sp->hdr.type);
95
96		switch (sp->hdr.type) {
97		case RXRPC_PACKET_TYPE_VERSION:
98			if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
99					  &v, 1) < 0)
100				return;
101			_proto("Rx VERSION { %02x }", v);
102			if (v == 0)
103				rxrpc_send_version_request(local, &sp->hdr, skb);
104			break;
105
106		default:
107			/* Just ignore anything we don't understand */
108			break;
109		}
110
111		rxrpc_free_skb(skb, rxrpc_skb_freed);
112	}
113
114	_leave("");
115}
116