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8d6e79d3 JM |
1 | /* |
2 | * include/net/tipc.h: Include file for TIPC message header routines | |
3 | * | |
4 | * Copyright (c) 2017 Ericsson AB | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions are met: | |
9 | * | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * 3. Neither the names of the copyright holders nor the names of its | |
16 | * contributors may be used to endorse or promote products derived from | |
17 | * this software without specific prior written permission. | |
18 | * | |
19 | * Alternatively, this software may be distributed under the terms of the | |
20 | * GNU General Public License ("GPL") version 2 as published by the Free | |
21 | * Software Foundation. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
30 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
31 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
32 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
33 | * POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
36 | #ifndef _TIPC_HDR_H | |
37 | #define _TIPC_HDR_H | |
38 | ||
39 | #include <linux/random.h> | |
40 | ||
41 | #define KEEPALIVE_MSG_MASK 0x0e080000 /* LINK_PROTOCOL + MSG_IS_KEEPALIVE */ | |
42 | ||
43 | struct tipc_basic_hdr { | |
44 | __be32 w[4]; | |
45 | }; | |
46 | ||
d869dea6 | 47 | static inline __be32 tipc_hdr_rps_key(struct tipc_basic_hdr *hdr) |
8d6e79d3 JM |
48 | { |
49 | u32 w0 = ntohl(hdr->w[0]); | |
50 | bool keepalive_msg = (w0 & KEEPALIVE_MSG_MASK) == KEEPALIVE_MSG_MASK; | |
d869dea6 | 51 | __be32 key; |
8d6e79d3 JM |
52 | |
53 | /* Return source node identity as key */ | |
54 | if (likely(!keepalive_msg)) | |
55 | return hdr->w[3]; | |
56 | ||
57 | /* Spread PROBE/PROBE_REPLY messages across the cores */ | |
58 | get_random_bytes(&key, sizeof(key)); | |
59 | return key; | |
60 | } | |
61 | ||
62 | #endif |