Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Michael MIC implementation - optimized for TKIP MIC operations
 * Copyright 2002-2003, Instant802 Networks, Inc.
 */
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/ieee80211.h>
#include <asm/unaligned.h>
 
#include "michael.h"
 
static void michael_block(struct michael_mic_ctx *mctx, u32 val)
{
<------>mctx->l ^= val;
<------>mctx->r ^= rol32(mctx->l, 17);
<------>mctx->l += mctx->r;
<------>mctx->r ^= ((mctx->l & 0xff00ff00) >> 8) |
<------><------>   ((mctx->l & 0x00ff00ff) << 8);
<------>mctx->l += mctx->r;
<------>mctx->r ^= rol32(mctx->l, 3);
<------>mctx->l += mctx->r;
<------>mctx->r ^= ror32(mctx->l, 2);
<------>mctx->l += mctx->r;
}
 
static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key,
<------><------><------>    struct ieee80211_hdr *hdr)
{
<------>u8 *da, *sa, tid;
 
<------>da = ieee80211_get_DA(hdr);
<------>sa = ieee80211_get_SA(hdr);
<------>if (ieee80211_is_data_qos(hdr->frame_control))
<------><------>tid = ieee80211_get_tid(hdr);
<------>else
<------><------>tid = 0;
 
<------>mctx->l = get_unaligned_le32(key);
<------>mctx->r = get_unaligned_le32(key + 4);
 
<------>/*
<------> * A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
<------> * calculation, but it is _not_ transmitted
<------> */
<------>michael_block(mctx, get_unaligned_le32(da));
<------>michael_block(mctx, get_unaligned_le16(&da[4]) |
<------><------><------>    (get_unaligned_le16(sa) << 16));
<------>michael_block(mctx, get_unaligned_le32(&sa[2]));
<------>michael_block(mctx, tid);
}
 
void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
<------><------> const u8 *data, size_t data_len, u8 *mic)
{
<------>u32 val;
<------>size_t block, blocks, left;
<------>struct michael_mic_ctx mctx;
 
<------>michael_mic_hdr(&mctx, key, hdr);
 
<------>/* Real data */
<------>blocks = data_len / 4;
<------>left = data_len % 4;
 
<------>for (block = 0; block < blocks; block++)
<------><------>michael_block(&mctx, get_unaligned_le32(&data[block * 4]));
 
<------>/* Partial block of 0..3 bytes and padding: 0x5a + 4..7 zeros to make
<------> * total length a multiple of 4. */
<------>val = 0x5a;
<------>while (left > 0) {
<------><------>val <<= 8;
<------><------>left--;
<------><------>val |= data[blocks * 4 + left];
<------>}
 
<------>michael_block(&mctx, val);
<------>michael_block(&mctx, 0);
 
<------>put_unaligned_le32(mctx.l, mic);
<------>put_unaligned_le32(mctx.r, mic + 4);
}