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
19 static const char rxrpc_version_string[65] = "linux-" UTS_RELEASE " AF_RXRPC";
20
21 /*
22 * Reply to a version request
23 */
rxrpc_send_version_request(struct rxrpc_local * local,struct rxrpc_host_header * hdr,struct sk_buff * skb)24 static 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 */
rxrpc_process_local_events(struct rxrpc_local * local)82 void 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
