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