Source of tkip.c - linux-imx - PHYTEC BitBucket (Stash)

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/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright (C) 2016 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/export.h>
    rc4key = write_tkip_iv(rc4key, tsc_IV16);
    *rc4key++ = ((ppk[5] ^ get_unaligned_le16(tk)) >> 1) & 0xFF;
​
    for (i = 0; i < 6; i++)
        put_unaligned_le16(ppk[i], rc4key + 2 * i);
}
​
/* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets
 * of the IV. Returns pointer to the octet following IVs (i.e., beginning of
 * the packet payload). */
u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key)
u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key_conf *keyconf, u64 pn)
{
    lockdep_assert_held(&key->u.tkip.txlock);
​
    pos = write_tkip_iv(pos, key->u.tkip.tx.iv16);
    *pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;
    put_unaligned_le32(key->u.tkip.tx.iv32, pos);
    pos = write_tkip_iv(pos, TKIP_PN_TO_IV16(pn));
    *pos++ = (keyconf->keyidx << 6) | (1 << 5) /* Ext IV */;
    put_unaligned_le32(TKIP_PN_TO_IV32(pn), pos);
    return pos + 4;
}
EXPORT_SYMBOL_GPL(ieee80211_tkip_add_iv);
​
static void ieee80211_compute_tkip_p1k(struct ieee80211_key *key, u32 iv32)
{
    struct ieee80211_sub_if_data *sdata = key->sdata;
    struct tkip_ctx *ctx = &key->u.tkip.tx;
    const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
​
    lockdep_assert_held(&key->u.tkip.txlock);
​
    /*
                struct ieee80211_key *key,
                u8 *payload, size_t payload_len, u8 *ta,
                u8 *ra, int only_iv, int queue,
                u32 *out_iv32, u16 *out_iv16)
{
    u32 iv32;
    u32 iv16;
    u8 rc4key[16], keyid, *pos = payload;
    int res;
    const u8 *tk = &key->conf.key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
    struct tkip_ctx_rx *rx_ctx = &key->u.tkip.rx[queue];
​
    if (payload_len < 12)
        return -1;
​
    iv16 = (pos[0] << 8) | pos[2];
    keyid = pos[3];
    iv32 = get_unaligned_le32(pos + 4);
    pos += 8;
​
    if (!(keyid & (1 << 5)))
        return TKIP_DECRYPT_NO_EXT_IV;
​
    if ((keyid >> 6) != key->conf.keyidx)
        return TKIP_DECRYPT_INVALID_KEYIDX;
​
    if (key->u.tkip.rx[queue].state != TKIP_STATE_NOT_INIT &&
        (iv32 < key->u.tkip.rx[queue].iv32 ||
         (iv32 == key->u.tkip.rx[queue].iv32 &&
          iv16 <= key->u.tkip.rx[queue].iv16)))
    if (rx_ctx->ctx.state != TKIP_STATE_NOT_INIT &&
        (iv32 < rx_ctx->iv32 ||
         (iv32 == rx_ctx->iv32 && iv16 <= rx_ctx->iv16)))
        return TKIP_DECRYPT_REPLAY;
​
    if (only_iv) {
        res = TKIP_DECRYPT_OK;
        key->u.tkip.rx[queue].state = TKIP_STATE_PHASE1_HW_UPLOADED;
        rx_ctx->ctx.state = TKIP_STATE_PHASE1_HW_UPLOADED;
        goto done;
    }
​
    if (key->u.tkip.rx[queue].state == TKIP_STATE_NOT_INIT ||
        key->u.tkip.rx[queue].iv32 != iv32) {
    if (rx_ctx->ctx.state == TKIP_STATE_NOT_INIT ||
        rx_ctx->iv32 != iv32) {
        /* IV16 wrapped around - perform TKIP phase 1 */
        tkip_mixing_phase1(tk, &key->u.tkip.rx[queue], ta, iv32);
        tkip_mixing_phase1(tk, &rx_ctx->ctx, ta, iv32);
    }
    if (key->local->ops->update_tkip_key &&
        key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
        key->u.tkip.rx[queue].state != TKIP_STATE_PHASE1_HW_UPLOADED) {
        rx_ctx->ctx.state != TKIP_STATE_PHASE1_HW_UPLOADED) {
        struct ieee80211_sub_if_data *sdata = key->sdata;
​
        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
            sdata = container_of(key->sdata->bss,
                    struct ieee80211_sub_if_data, u.ap);
        drv_update_tkip_key(key->local, sdata, &key->conf, key->sta,
                iv32, key->u.tkip.rx[queue].p1k);
        key->u.tkip.rx[queue].state = TKIP_STATE_PHASE1_HW_UPLOADED;
                iv32, rx_ctx->ctx.p1k);
        rx_ctx->ctx.state = TKIP_STATE_PHASE1_HW_UPLOADED;
    }
​
    tkip_mixing_phase2(tk, &key->u.tkip.rx[queue], iv16, rc4key);
    tkip_mixing_phase2(tk, &rx_ctx->ctx, iv16, rc4key);
​
    res = ieee80211_wep_decrypt_data(tfm, rc4key, 16, pos, payload_len - 12);
 done:
    if (res == TKIP_DECRYPT_OK) {
        /*
         * Record previously received IV, will be copied into the
         * key information after MIC verification. It is possible
         * that we don't catch replays of fragments but that's ok
         * because the Michael MIC verication will then fail.
         */