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
23 static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
24
25 /*
26 * Reply to a version request
27 */
rxrpc_send_version_request(struct rxrpc_local * local,struct rxrpc_host_header * hdr,struct sk_buff * skb)28 static 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_point_version_reply);
76 else
77 trace_rxrpc_tx_packet(local->debug_id, &whdr,
78 rxrpc_tx_point_version_reply);
79
80 _leave("");
81 }
82
83 /*
84 * Process event packets targetted at a local endpoint.
85 */
rxrpc_process_local_events(struct rxrpc_local * local)86 void rxrpc_process_local_events(struct rxrpc_local *local)
87 {
88 struct sk_buff *skb;
89 char v;
90
91 _enter("");
92
93 skb = skb_dequeue(&local->event_queue);
94 if (skb) {
95 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
96
97 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
98 _debug("{%d},{%u}", local->debug_id, sp->hdr.type);
99
100 switch (sp->hdr.type) {
101 case RXRPC_PACKET_TYPE_VERSION:
102 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
103 &v, 1) < 0)
104 return;
105 _proto("Rx VERSION { %02x }", v);
106 if (v == 0)
107 rxrpc_send_version_request(local, &sp->hdr, skb);
108 break;
109
110 default:
111 /* Just ignore anything we don't understand */
112 break;
113 }
114
115 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
116 }
117
118 _leave("");
119 }
120
