cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tipc.h (2405B)

      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
     43struct tipc_basic_hdr {
     44	__be32 w[4];
     45};
     46
     47static inline __be32 tipc_hdr_rps_key(struct tipc_basic_hdr *hdr)
     48{
     49	u32 w0 = ntohl(hdr->w[0]);
     50	bool keepalive_msg = (w0 & KEEPALIVE_MSG_MASK) == KEEPALIVE_MSG_MASK;
     51	__be32 key;
     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