ACPI: SBS: Simplify the code using module_acpi_driver()
[linux-2.6-microblaze.git] / net / rxrpc / local_event.c
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  */
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  */
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 }