![Johannes Berg](/assets/img/avatar_default.png)
This message occasionally triggers for some people as in https://bugzilla.redhat.com/show_bug.cgi?id=1111740 but it's not clear which (headroom or tailroom) is at fault. Annotate the message a bit to get more information. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
822 lines
21 KiB
C
822 lines
21 KiB
C
/*
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* Copyright 2002-2004, Instant802 Networks, Inc.
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* Copyright 2008, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/compiler.h>
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#include <linux/ieee80211.h>
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#include <linux/gfp.h>
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#include <asm/unaligned.h>
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#include <net/mac80211.h>
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#include <crypto/aes.h>
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#include "ieee80211_i.h"
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#include "michael.h"
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#include "tkip.h"
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#include "aes_ccm.h"
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#include "aes_cmac.h"
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#include "wpa.h"
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ieee80211_tx_result
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ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
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{
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u8 *data, *key, *mic;
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size_t data_len;
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unsigned int hdrlen;
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struct ieee80211_hdr *hdr;
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struct sk_buff *skb = tx->skb;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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int tail;
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hdr = (struct ieee80211_hdr *)skb->data;
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if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
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skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
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return TX_CONTINUE;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (skb->len < hdrlen)
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return TX_DROP;
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data = skb->data + hdrlen;
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data_len = skb->len - hdrlen;
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if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
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/* Need to use software crypto for the test */
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info->control.hw_key = NULL;
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}
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if (info->control.hw_key &&
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(info->flags & IEEE80211_TX_CTL_DONTFRAG ||
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tx->local->ops->set_frag_threshold) &&
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!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
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/* hwaccel - with no need for SW-generated MMIC */
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return TX_CONTINUE;
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}
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tail = MICHAEL_MIC_LEN;
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if (!info->control.hw_key)
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tail += IEEE80211_TKIP_ICV_LEN;
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if (WARN(skb_tailroom(skb) < tail ||
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skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
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"mmic: not enough head/tail (%d/%d,%d/%d)\n",
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skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
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skb_tailroom(skb), tail))
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return TX_DROP;
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key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
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mic = skb_put(skb, MICHAEL_MIC_LEN);
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michael_mic(key, hdr, data, data_len, mic);
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if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
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mic[0]++;
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return TX_CONTINUE;
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}
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ieee80211_rx_result
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ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
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{
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u8 *data, *key = NULL;
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size_t data_len;
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unsigned int hdrlen;
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u8 mic[MICHAEL_MIC_LEN];
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struct sk_buff *skb = rx->skb;
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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/*
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* it makes no sense to check for MIC errors on anything other
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* than data frames.
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*/
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if (!ieee80211_is_data_present(hdr->frame_control))
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return RX_CONTINUE;
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/*
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* No way to verify the MIC if the hardware stripped it or
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* the IV with the key index. In this case we have solely rely
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* on the driver to set RX_FLAG_MMIC_ERROR in the event of a
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* MIC failure report.
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*/
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if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
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if (status->flag & RX_FLAG_MMIC_ERROR)
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goto mic_fail_no_key;
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if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
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rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
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goto update_iv;
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return RX_CONTINUE;
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}
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/*
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* Some hardware seems to generate Michael MIC failure reports; even
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* though, the frame was not encrypted with TKIP and therefore has no
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* MIC. Ignore the flag them to avoid triggering countermeasures.
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*/
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if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
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!(status->flag & RX_FLAG_DECRYPTED))
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return RX_CONTINUE;
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if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
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/*
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* APs with pairwise keys should never receive Michael MIC
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* errors for non-zero keyidx because these are reserved for
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* group keys and only the AP is sending real multicast
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* frames in the BSS.
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*/
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return RX_DROP_UNUSABLE;
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}
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if (status->flag & RX_FLAG_MMIC_ERROR)
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goto mic_fail;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (skb->len < hdrlen + MICHAEL_MIC_LEN)
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return RX_DROP_UNUSABLE;
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if (skb_linearize(rx->skb))
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return RX_DROP_UNUSABLE;
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hdr = (void *)skb->data;
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data = skb->data + hdrlen;
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data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
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key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
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michael_mic(key, hdr, data, data_len, mic);
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if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
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goto mic_fail;
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/* remove Michael MIC from payload */
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skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
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update_iv:
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/* update IV in key information to be able to detect replays */
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rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
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rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
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return RX_CONTINUE;
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mic_fail:
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rx->key->u.tkip.mic_failures++;
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mic_fail_no_key:
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/*
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* In some cases the key can be unset - e.g. a multicast packet, in
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* a driver that supports HW encryption. Send up the key idx only if
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* the key is set.
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*/
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mac80211_ev_michael_mic_failure(rx->sdata,
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rx->key ? rx->key->conf.keyidx : -1,
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(void *) skb->data, NULL, GFP_ATOMIC);
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return RX_DROP_UNUSABLE;
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}
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static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_key *key = tx->key;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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unsigned int hdrlen;
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int len, tail;
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u8 *pos;
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if (info->control.hw_key &&
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!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
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!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
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/* hwaccel - with no need for software-generated IV */
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return 0;
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}
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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len = skb->len - hdrlen;
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if (info->control.hw_key)
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tail = 0;
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else
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tail = IEEE80211_TKIP_ICV_LEN;
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if (WARN_ON(skb_tailroom(skb) < tail ||
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skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
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return -1;
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pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
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memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
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skb_set_network_header(skb, skb_network_offset(skb) +
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IEEE80211_TKIP_IV_LEN);
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pos += hdrlen;
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/* the HW only needs room for the IV, but not the actual IV */
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if (info->control.hw_key &&
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(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
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return 0;
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/* Increase IV for the frame */
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spin_lock(&key->u.tkip.txlock);
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key->u.tkip.tx.iv16++;
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if (key->u.tkip.tx.iv16 == 0)
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key->u.tkip.tx.iv32++;
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pos = ieee80211_tkip_add_iv(pos, key);
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spin_unlock(&key->u.tkip.txlock);
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/* hwaccel - with software IV */
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if (info->control.hw_key)
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return 0;
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/* Add room for ICV */
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skb_put(skb, IEEE80211_TKIP_ICV_LEN);
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return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
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key, skb, pos, len);
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}
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ieee80211_tx_result
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ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
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{
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struct sk_buff *skb;
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ieee80211_tx_set_protected(tx);
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skb_queue_walk(&tx->skbs, skb) {
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if (tkip_encrypt_skb(tx, skb) < 0)
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return TX_DROP;
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}
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return TX_CONTINUE;
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}
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ieee80211_rx_result
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ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
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int hdrlen, res, hwaccel = 0;
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struct ieee80211_key *key = rx->key;
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struct sk_buff *skb = rx->skb;
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (!ieee80211_is_data(hdr->frame_control))
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return RX_CONTINUE;
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if (!rx->sta || skb->len - hdrlen < 12)
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return RX_DROP_UNUSABLE;
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/* it may be possible to optimize this a bit more */
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if (skb_linearize(rx->skb))
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return RX_DROP_UNUSABLE;
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hdr = (void *)skb->data;
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/*
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* Let TKIP code verify IV, but skip decryption.
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* In the case where hardware checks the IV as well,
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* we don't even get here, see ieee80211_rx_h_decrypt()
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*/
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if (status->flag & RX_FLAG_DECRYPTED)
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hwaccel = 1;
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res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
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key, skb->data + hdrlen,
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skb->len - hdrlen, rx->sta->sta.addr,
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hdr->addr1, hwaccel, rx->security_idx,
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&rx->tkip_iv32,
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&rx->tkip_iv16);
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if (res != TKIP_DECRYPT_OK)
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return RX_DROP_UNUSABLE;
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/* Trim ICV */
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skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
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/* Remove IV */
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memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
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skb_pull(skb, IEEE80211_TKIP_IV_LEN);
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return RX_CONTINUE;
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}
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static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
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{
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__le16 mask_fc;
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int a4_included, mgmt;
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u8 qos_tid;
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u16 len_a;
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unsigned int hdrlen;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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/*
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* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
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* Retry, PwrMgt, MoreData; set Protected
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*/
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mgmt = ieee80211_is_mgmt(hdr->frame_control);
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mask_fc = hdr->frame_control;
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mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
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IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
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if (!mgmt)
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mask_fc &= ~cpu_to_le16(0x0070);
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mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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len_a = hdrlen - 2;
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a4_included = ieee80211_has_a4(hdr->frame_control);
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if (ieee80211_is_data_qos(hdr->frame_control))
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qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
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else
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qos_tid = 0;
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/* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
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* mode authentication are not allowed to collide, yet both are derived
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* from this vector b_0. We only set L := 1 here to indicate that the
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* data size can be represented in (L+1) bytes. The CCM layer will take
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* care of storing the data length in the top (L+1) bytes and setting
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* and clearing the other bits as is required to derive the two IVs.
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*/
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b_0[0] = 0x1;
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/* Nonce: Nonce Flags | A2 | PN
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* Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
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*/
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b_0[1] = qos_tid | (mgmt << 4);
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memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
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memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
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/* AAD (extra authenticate-only data) / masked 802.11 header
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* FC | A1 | A2 | A3 | SC | [A4] | [QC] */
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put_unaligned_be16(len_a, &aad[0]);
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put_unaligned(mask_fc, (__le16 *)&aad[2]);
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memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
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/* Mask Seq#, leave Frag# */
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aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
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aad[23] = 0;
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if (a4_included) {
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memcpy(&aad[24], hdr->addr4, ETH_ALEN);
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aad[30] = qos_tid;
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aad[31] = 0;
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} else {
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memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
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aad[24] = qos_tid;
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}
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}
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static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
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{
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hdr[0] = pn[5];
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hdr[1] = pn[4];
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hdr[2] = 0;
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hdr[3] = 0x20 | (key_id << 6);
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hdr[4] = pn[3];
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hdr[5] = pn[2];
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hdr[6] = pn[1];
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hdr[7] = pn[0];
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}
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static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
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{
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pn[0] = hdr[7];
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pn[1] = hdr[6];
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pn[2] = hdr[5];
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pn[3] = hdr[4];
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pn[4] = hdr[1];
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pn[5] = hdr[0];
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}
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static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_key *key = tx->key;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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int hdrlen, len, tail;
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u8 *pos;
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u8 pn[6];
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u64 pn64;
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u8 aad[2 * AES_BLOCK_SIZE];
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u8 b_0[AES_BLOCK_SIZE];
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if (info->control.hw_key &&
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!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
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!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
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!((info->control.hw_key->flags &
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IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
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ieee80211_is_mgmt(hdr->frame_control))) {
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/*
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* hwaccel has no need for preallocated room for CCMP
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* header or MIC fields
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*/
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return 0;
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}
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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len = skb->len - hdrlen;
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if (info->control.hw_key)
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tail = 0;
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else
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tail = IEEE80211_CCMP_MIC_LEN;
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if (WARN_ON(skb_tailroom(skb) < tail ||
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skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
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return -1;
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pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
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memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
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skb_set_network_header(skb, skb_network_offset(skb) +
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IEEE80211_CCMP_HDR_LEN);
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/* the HW only needs room for the IV, but not the actual IV */
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if (info->control.hw_key &&
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(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
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return 0;
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hdr = (struct ieee80211_hdr *) pos;
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pos += hdrlen;
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pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn);
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pn[5] = pn64;
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pn[4] = pn64 >> 8;
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pn[3] = pn64 >> 16;
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pn[2] = pn64 >> 24;
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pn[1] = pn64 >> 32;
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pn[0] = pn64 >> 40;
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ccmp_pn2hdr(pos, pn, key->conf.keyidx);
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/* hwaccel - with software CCMP header */
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if (info->control.hw_key)
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return 0;
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|
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pos += IEEE80211_CCMP_HDR_LEN;
|
|
ccmp_special_blocks(skb, pn, b_0, aad);
|
|
ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
|
|
skb_put(skb, IEEE80211_CCMP_MIC_LEN));
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
ieee80211_tx_result
|
|
ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
ieee80211_tx_set_protected(tx);
|
|
|
|
skb_queue_walk(&tx->skbs, skb) {
|
|
if (ccmp_encrypt_skb(tx, skb) < 0)
|
|
return TX_DROP;
|
|
}
|
|
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
|
|
ieee80211_rx_result
|
|
ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
|
|
int hdrlen;
|
|
struct ieee80211_key *key = rx->key;
|
|
struct sk_buff *skb = rx->skb;
|
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
|
|
u8 pn[IEEE80211_CCMP_PN_LEN];
|
|
int data_len;
|
|
int queue;
|
|
|
|
hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
|
|
|
if (!ieee80211_is_data(hdr->frame_control) &&
|
|
!ieee80211_is_robust_mgmt_frame(skb))
|
|
return RX_CONTINUE;
|
|
|
|
data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN -
|
|
IEEE80211_CCMP_MIC_LEN;
|
|
if (!rx->sta || data_len < 0)
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
if (status->flag & RX_FLAG_DECRYPTED) {
|
|
if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
|
|
return RX_DROP_UNUSABLE;
|
|
} else {
|
|
if (skb_linearize(rx->skb))
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
|
|
ccmp_hdr2pn(pn, skb->data + hdrlen);
|
|
|
|
queue = rx->security_idx;
|
|
|
|
if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) {
|
|
key->u.ccmp.replays++;
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
|
|
if (!(status->flag & RX_FLAG_DECRYPTED)) {
|
|
u8 aad[2 * AES_BLOCK_SIZE];
|
|
u8 b_0[AES_BLOCK_SIZE];
|
|
/* hardware didn't decrypt/verify MIC */
|
|
ccmp_special_blocks(skb, pn, b_0, aad);
|
|
|
|
if (ieee80211_aes_ccm_decrypt(
|
|
key->u.ccmp.tfm, b_0, aad,
|
|
skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
|
|
data_len,
|
|
skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
|
|
memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
|
|
|
|
/* Remove CCMP header and MIC */
|
|
if (pskb_trim(skb, skb->len - IEEE80211_CCMP_MIC_LEN))
|
|
return RX_DROP_UNUSABLE;
|
|
memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
|
|
skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
|
|
|
|
return RX_CONTINUE;
|
|
}
|
|
|
|
static ieee80211_tx_result
|
|
ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
|
struct ieee80211_key *key = tx->key;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
const struct ieee80211_cipher_scheme *cs = key->sta->cipher_scheme;
|
|
int hdrlen;
|
|
u8 *pos;
|
|
|
|
if (info->control.hw_key &&
|
|
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
|
|
/* hwaccel has no need for preallocated head room */
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
if (unlikely(skb_headroom(skb) < cs->hdr_len &&
|
|
pskb_expand_head(skb, cs->hdr_len, 0, GFP_ATOMIC)))
|
|
return TX_DROP;
|
|
|
|
hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
|
|
|
pos = skb_push(skb, cs->hdr_len);
|
|
memmove(pos, pos + cs->hdr_len, hdrlen);
|
|
skb_set_network_header(skb, skb_network_offset(skb) + cs->hdr_len);
|
|
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
|
|
{
|
|
int i;
|
|
|
|
/* pn is little endian */
|
|
for (i = len - 1; i >= 0; i--) {
|
|
if (pn1[i] < pn2[i])
|
|
return -1;
|
|
else if (pn1[i] > pn2[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ieee80211_rx_result
|
|
ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
|
|
{
|
|
struct ieee80211_key *key = rx->key;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
|
|
const struct ieee80211_cipher_scheme *cs = NULL;
|
|
int hdrlen = ieee80211_hdrlen(hdr->frame_control);
|
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
|
|
int data_len;
|
|
u8 *rx_pn;
|
|
u8 *skb_pn;
|
|
u8 qos_tid;
|
|
|
|
if (!rx->sta || !rx->sta->cipher_scheme ||
|
|
!(status->flag & RX_FLAG_DECRYPTED))
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
if (!ieee80211_is_data(hdr->frame_control))
|
|
return RX_CONTINUE;
|
|
|
|
cs = rx->sta->cipher_scheme;
|
|
|
|
data_len = rx->skb->len - hdrlen - cs->hdr_len;
|
|
|
|
if (data_len < 0)
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
if (ieee80211_is_data_qos(hdr->frame_control))
|
|
qos_tid = *ieee80211_get_qos_ctl(hdr) &
|
|
IEEE80211_QOS_CTL_TID_MASK;
|
|
else
|
|
qos_tid = 0;
|
|
|
|
if (skb_linearize(rx->skb))
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
hdr = (struct ieee80211_hdr *)rx->skb->data;
|
|
|
|
rx_pn = key->u.gen.rx_pn[qos_tid];
|
|
skb_pn = rx->skb->data + hdrlen + cs->pn_off;
|
|
|
|
if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
memcpy(rx_pn, skb_pn, cs->pn_len);
|
|
|
|
/* remove security header and MIC */
|
|
if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
|
|
skb_pull(rx->skb, cs->hdr_len);
|
|
|
|
return RX_CONTINUE;
|
|
}
|
|
|
|
static void bip_aad(struct sk_buff *skb, u8 *aad)
|
|
{
|
|
__le16 mask_fc;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
|
|
/* BIP AAD: FC(masked) || A1 || A2 || A3 */
|
|
|
|
/* FC type/subtype */
|
|
/* Mask FC Retry, PwrMgt, MoreData flags to zero */
|
|
mask_fc = hdr->frame_control;
|
|
mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
|
|
IEEE80211_FCTL_MOREDATA);
|
|
put_unaligned(mask_fc, (__le16 *) &aad[0]);
|
|
/* A1 || A2 || A3 */
|
|
memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
|
|
}
|
|
|
|
|
|
static inline void bip_ipn_set64(u8 *d, u64 pn)
|
|
{
|
|
*d++ = pn;
|
|
*d++ = pn >> 8;
|
|
*d++ = pn >> 16;
|
|
*d++ = pn >> 24;
|
|
*d++ = pn >> 32;
|
|
*d = pn >> 40;
|
|
}
|
|
|
|
static inline void bip_ipn_swap(u8 *d, const u8 *s)
|
|
{
|
|
*d++ = s[5];
|
|
*d++ = s[4];
|
|
*d++ = s[3];
|
|
*d++ = s[2];
|
|
*d++ = s[1];
|
|
*d = s[0];
|
|
}
|
|
|
|
|
|
ieee80211_tx_result
|
|
ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct ieee80211_tx_info *info;
|
|
struct ieee80211_key *key = tx->key;
|
|
struct ieee80211_mmie *mmie;
|
|
u8 aad[20];
|
|
u64 pn64;
|
|
|
|
if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
|
|
return TX_DROP;
|
|
|
|
skb = skb_peek(&tx->skbs);
|
|
|
|
info = IEEE80211_SKB_CB(skb);
|
|
|
|
if (info->control.hw_key)
|
|
return TX_CONTINUE;
|
|
|
|
if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
|
|
return TX_DROP;
|
|
|
|
mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
|
|
mmie->element_id = WLAN_EID_MMIE;
|
|
mmie->length = sizeof(*mmie) - 2;
|
|
mmie->key_id = cpu_to_le16(key->conf.keyidx);
|
|
|
|
/* PN = PN + 1 */
|
|
pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
|
|
|
|
bip_ipn_set64(mmie->sequence_number, pn64);
|
|
|
|
bip_aad(skb, aad);
|
|
|
|
/*
|
|
* MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
|
|
*/
|
|
ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
|
|
skb->data + 24, skb->len - 24, mmie->mic);
|
|
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
|
|
ieee80211_rx_result
|
|
ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
|
|
{
|
|
struct sk_buff *skb = rx->skb;
|
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
|
|
struct ieee80211_key *key = rx->key;
|
|
struct ieee80211_mmie *mmie;
|
|
u8 aad[20], mic[8], ipn[6];
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
|
|
if (!ieee80211_is_mgmt(hdr->frame_control))
|
|
return RX_CONTINUE;
|
|
|
|
/* management frames are already linear */
|
|
|
|
if (skb->len < 24 + sizeof(*mmie))
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
mmie = (struct ieee80211_mmie *)
|
|
(skb->data + skb->len - sizeof(*mmie));
|
|
if (mmie->element_id != WLAN_EID_MMIE ||
|
|
mmie->length != sizeof(*mmie) - 2)
|
|
return RX_DROP_UNUSABLE; /* Invalid MMIE */
|
|
|
|
bip_ipn_swap(ipn, mmie->sequence_number);
|
|
|
|
if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
|
|
key->u.aes_cmac.replays++;
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
|
|
if (!(status->flag & RX_FLAG_DECRYPTED)) {
|
|
/* hardware didn't decrypt/verify MIC */
|
|
bip_aad(skb, aad);
|
|
ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
|
|
skb->data + 24, skb->len - 24, mic);
|
|
if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
|
|
key->u.aes_cmac.icverrors++;
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
}
|
|
|
|
memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
|
|
|
|
/* Remove MMIE */
|
|
skb_trim(skb, skb->len - sizeof(*mmie));
|
|
|
|
return RX_CONTINUE;
|
|
}
|
|
|
|
ieee80211_tx_result
|
|
ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct ieee80211_tx_info *info = NULL;
|
|
ieee80211_tx_result res;
|
|
|
|
skb_queue_walk(&tx->skbs, skb) {
|
|
info = IEEE80211_SKB_CB(skb);
|
|
|
|
/* handle hw-only algorithm */
|
|
if (!info->control.hw_key)
|
|
return TX_DROP;
|
|
|
|
if (tx->key->sta->cipher_scheme) {
|
|
res = ieee80211_crypto_cs_encrypt(tx, skb);
|
|
if (res != TX_CONTINUE)
|
|
return res;
|
|
}
|
|
}
|
|
|
|
ieee80211_tx_set_protected(tx);
|
|
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
ieee80211_rx_result
|
|
ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
|
|
{
|
|
if (rx->sta && rx->sta->cipher_scheme)
|
|
return ieee80211_crypto_cs_decrypt(rx);
|
|
|
|
return RX_DROP_UNUSABLE;
|
|
}
|