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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}
1/* AF_RXRPC local endpoint management
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
17#include <linux/slab.h>
18#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include <generated/utsrelease.h>
21#include "ar-internal.h"
22
23static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
24
25/*
26 * Reply to a version request
27 */
28static void rxrpc_send_version_request(struct rxrpc_local *local,
29 struct rxrpc_host_header *hdr,
30 struct sk_buff *skb)
31{
32 struct rxrpc_wire_header whdr;
33 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
34 struct sockaddr_rxrpc srx;
35 struct msghdr msg;
36 struct kvec iov[2];
37 size_t len;
38 int ret;
39
40 _enter("");
41
42 if (rxrpc_extract_addr_from_skb(local, &srx, skb) < 0)
43 return;
44
45 msg.msg_name = &srx.transport;
46 msg.msg_namelen = srx.transport_len;
47 msg.msg_control = NULL;
48 msg.msg_controllen = 0;
49 msg.msg_flags = 0;
50
51 whdr.epoch = htonl(sp->hdr.epoch);
52 whdr.cid = htonl(sp->hdr.cid);
53 whdr.callNumber = htonl(sp->hdr.callNumber);
54 whdr.seq = 0;
55 whdr.serial = 0;
56 whdr.type = RXRPC_PACKET_TYPE_VERSION;
57 whdr.flags = RXRPC_LAST_PACKET | (~hdr->flags & RXRPC_CLIENT_INITIATED);
58 whdr.userStatus = 0;
59 whdr.securityIndex = 0;
60 whdr._rsvd = 0;
61 whdr.serviceId = htons(sp->hdr.serviceId);
62
63 iov[0].iov_base = &whdr;
64 iov[0].iov_len = sizeof(whdr);
65 iov[1].iov_base = (char *)rxrpc_version_string;
66 iov[1].iov_len = sizeof(rxrpc_version_string);
67
68 len = iov[0].iov_len + iov[1].iov_len;
69
70 _proto("Tx VERSION (reply)");
71
72 ret = kernel_sendmsg(local->socket, &msg, iov, 2, len);
73 if (ret < 0)
74 trace_rxrpc_tx_fail(local->debug_id, 0, ret,
75 rxrpc_tx_fail_version_reply);
76
77 _leave("");
78}
79
80/*
81 * Process event packets targetted at a local endpoint.
82 */
83void rxrpc_process_local_events(struct rxrpc_local *local)
84{
85 struct sk_buff *skb;
86 char v;
87
88 _enter("");
89
90 skb = skb_dequeue(&local->event_queue);
91 if (skb) {
92 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
93
94 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
95 _debug("{%d},{%u}", local->debug_id, sp->hdr.type);
96
97 switch (sp->hdr.type) {
98 case RXRPC_PACKET_TYPE_VERSION:
99 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
100 &v, 1) < 0)
101 return;
102 _proto("Rx VERSION { %02x }", v);
103 if (v == 0)
104 rxrpc_send_version_request(local, &sp->hdr, skb);
105 break;
106
107 default:
108 /* Just ignore anything we don't understand */
109 break;
110 }
111
112 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
113 }
114
115 _leave("");
116}