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87563616 DH |
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> | |
87563616 DH |
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 | */ | |
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); | |
1c2bc7b9 | 34 | struct sockaddr_rxrpc srx; |
87563616 DH |
35 | struct msghdr msg; |
36 | struct kvec iov[2]; | |
37 | size_t len; | |
38 | int ret; | |
39 | ||
40 | _enter(""); | |
41 | ||
1c2bc7b9 DH |
42 | if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) |
43 | return; | |
87563616 | 44 | |
1c2bc7b9 DH |
45 | msg.msg_name = &srx.transport; |
46 | msg.msg_namelen = srx.transport_len; | |
87563616 DH |
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 | _debug("sendmsg failed: %d", ret); | |
75 | ||
76 | _leave(""); | |
77 | } | |
78 | ||
79 | /* | |
80 | * Process event packets targetted at a local endpoint. | |
81 | */ | |
4f95dd78 | 82 | void rxrpc_process_local_events(struct rxrpc_local *local) |
87563616 | 83 | { |
87563616 DH |
84 | struct sk_buff *skb; |
85 | char v; | |
86 | ||
87 | _enter(""); | |
88 | ||
4f95dd78 DH |
89 | skb = skb_dequeue(&local->event_queue); |
90 | if (skb) { | |
87563616 DH |
91 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
92 | ||
71f3ca40 | 93 | rxrpc_see_skb(skb, rxrpc_skb_rx_seen); |
87563616 DH |
94 | _debug("{%d},{%u}", local->debug_id, sp->hdr.type); |
95 | ||
96 | switch (sp->hdr.type) { | |
97 | case RXRPC_PACKET_TYPE_VERSION: | |
248f219c | 98 | if (skb_copy_bits(skb, sp->offset, &v, 1) < 0) |
87563616 DH |
99 | return; |
100 | _proto("Rx VERSION { %02x }", v); | |
101 | if (v == 0) | |
102 | rxrpc_send_version_request(local, &sp->hdr, skb); | |
103 | break; | |
104 | ||
105 | default: | |
106 | /* Just ignore anything we don't understand */ | |
107 | break; | |
108 | } | |
109 | ||
71f3ca40 | 110 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
87563616 DH |
111 | } |
112 | ||
87563616 DH |
113 | _leave(""); |
114 | } |