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![Ivo van Doorn](/assets/img/avatar_default.png)
The hw_key_idx inside the ieee80211_key_conf structure does not provide all the information drivers might need to perform hardware encryption. This is in particular true for rt2x00 who needs to know the key algorithm and whether it is a shared or pairwise key. By passing the ieee80211_key_conf pointer it assures us that drivers can make full use of all information that it should know about a particular key. Additionally this patch updates all drivers to grab the hw_key_idx from the ieee80211_key_conf structure. v2: Removed bogus u16 cast v3: Add warning about ieee80211_tx_control pointers v4: Update warning about ieee80211_tx_control pointers Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
604 lines
15 KiB
C
604 lines
15 KiB
C
/*
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* Copyright 2002-2004, Instant802 Networks, Inc.
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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/slab.h>
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#include <linux/skbuff.h>
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#include <linux/compiler.h>
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#include <net/mac80211.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 "wpa.h"
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static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
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u8 *qos_tid, u8 **data, size_t *data_len)
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{
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struct ieee80211_hdr *hdr;
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size_t hdrlen;
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u16 fc;
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int a4_included;
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u8 *pos;
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hdr = (struct ieee80211_hdr *) skb->data;
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fc = le16_to_cpu(hdr->frame_control);
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hdrlen = 24;
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if ((fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) ==
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(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
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hdrlen += ETH_ALEN;
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*sa = hdr->addr4;
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*da = hdr->addr3;
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} else if (fc & IEEE80211_FCTL_FROMDS) {
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*sa = hdr->addr3;
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*da = hdr->addr1;
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} else if (fc & IEEE80211_FCTL_TODS) {
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*sa = hdr->addr2;
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*da = hdr->addr3;
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} else {
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*sa = hdr->addr2;
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*da = hdr->addr1;
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}
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if (fc & 0x80)
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hdrlen += 2;
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*data = skb->data + hdrlen;
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*data_len = skb->len - hdrlen;
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a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
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(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
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if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
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fc & IEEE80211_STYPE_QOS_DATA) {
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pos = (u8 *) &hdr->addr4;
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if (a4_included)
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pos += 6;
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*qos_tid = pos[0] & 0x0f;
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*qos_tid |= 0x80; /* qos_included flag */
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} else
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*qos_tid = 0;
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return skb->len < hdrlen ? -1 : 0;
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}
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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, *sa, *da, *key, *mic, qos_tid;
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size_t data_len;
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u16 fc;
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struct sk_buff *skb = tx->skb;
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int authenticator;
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int wpa_test = 0;
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fc = tx->fc;
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if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
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!WLAN_FC_DATA_PRESENT(fc))
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return TX_CONTINUE;
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if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
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return TX_DROP;
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if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
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!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
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!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
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!wpa_test) {
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/* hwaccel - with no need for preallocated room for Michael MIC
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*/
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return TX_CONTINUE;
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}
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if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
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I802_DEBUG_INC(tx->local->tx_expand_skb_head);
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if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
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MICHAEL_MIC_LEN + TKIP_ICV_LEN,
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GFP_ATOMIC))) {
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printk(KERN_DEBUG "%s: failed to allocate more memory "
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"for Michael MIC\n", tx->dev->name);
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return TX_DROP;
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}
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}
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#if 0
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authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
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#else
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authenticator = 1;
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#endif
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key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
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ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
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mic = skb_put(skb, MICHAEL_MIC_LEN);
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michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
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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, *sa, *da, *key = NULL, qos_tid;
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size_t data_len;
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u16 fc;
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u8 mic[MICHAEL_MIC_LEN];
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struct sk_buff *skb = rx->skb;
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int authenticator = 1, wpa_test = 0;
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DECLARE_MAC_BUF(mac);
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fc = rx->fc;
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/*
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* No way to verify the MIC if the hardware stripped it
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*/
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if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
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return RX_CONTINUE;
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if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
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!(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
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return RX_CONTINUE;
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if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
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|| data_len < MICHAEL_MIC_LEN)
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return RX_DROP_UNUSABLE;
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data_len -= MICHAEL_MIC_LEN;
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#if 0
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authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
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#else
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authenticator = 1;
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#endif
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key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
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ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
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michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
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if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
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if (!(rx->flags & IEEE80211_RX_RA_MATCH))
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return RX_DROP_UNUSABLE;
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printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
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"%s\n", rx->dev->name, print_mac(mac, sa));
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mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
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(void *) skb->data);
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return RX_DROP_UNUSABLE;
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}
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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 in key information to be able to detect replays */
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rx->key->u.tkip.iv32_rx[rx->queue] = rx->tkip_iv32;
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rx->key->u.tkip.iv16_rx[rx->queue] = rx->tkip_iv16;
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return RX_CONTINUE;
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}
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static int tkip_encrypt_skb(struct ieee80211_tx_data *tx,
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struct sk_buff *skb, int test)
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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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int hdrlen, len, tailneed;
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u16 fc;
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u8 *pos;
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fc = le16_to_cpu(hdr->frame_control);
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hdrlen = ieee80211_get_hdrlen(fc);
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len = skb->len - hdrlen;
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if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
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tailneed = 0;
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else
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tailneed = TKIP_ICV_LEN;
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if ((skb_headroom(skb) < TKIP_IV_LEN ||
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skb_tailroom(skb) < tailneed)) {
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I802_DEBUG_INC(tx->local->tx_expand_skb_head);
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if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
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GFP_ATOMIC)))
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return -1;
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}
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pos = skb_push(skb, TKIP_IV_LEN);
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memmove(pos, pos + TKIP_IV_LEN, hdrlen);
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pos += hdrlen;
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/* Increase IV for the frame */
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key->u.tkip.iv16++;
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if (key->u.tkip.iv16 == 0)
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key->u.tkip.iv32++;
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if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
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hdr = (struct ieee80211_hdr *)skb->data;
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/* hwaccel - with preallocated room for IV */
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ieee80211_tkip_add_iv(pos, key,
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(u8) (key->u.tkip.iv16 >> 8),
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(u8) (((key->u.tkip.iv16 >> 8) | 0x20) &
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0x7f),
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(u8) key->u.tkip.iv16);
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tx->control->hw_key = &tx->key->conf;
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return 0;
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}
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/* Add room for ICV */
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skb_put(skb, TKIP_ICV_LEN);
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hdr = (struct ieee80211_hdr *) skb->data;
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ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
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key, pos, len, hdr->addr2);
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return 0;
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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 = tx->skb;
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int wpa_test = 0, test = 0;
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tx->control->icv_len = TKIP_ICV_LEN;
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tx->control->iv_len = TKIP_IV_LEN;
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ieee80211_tx_set_protected(tx);
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if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
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!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
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!wpa_test) {
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/* hwaccel - with no need for preallocated room for IV/ICV */
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tx->control->hw_key = &tx->key->conf;
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return TX_CONTINUE;
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}
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if (tkip_encrypt_skb(tx, skb, test) < 0)
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return TX_DROP;
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if (tx->extra_frag) {
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int i;
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for (i = 0; i < tx->num_extra_frag; i++) {
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if (tkip_encrypt_skb(tx, tx->extra_frag[i], test)
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< 0)
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return TX_DROP;
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}
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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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u16 fc;
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int hdrlen, res, hwaccel = 0, wpa_test = 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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DECLARE_MAC_BUF(mac);
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fc = le16_to_cpu(hdr->frame_control);
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hdrlen = ieee80211_get_hdrlen(fc);
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if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
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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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if (rx->status->flag & RX_FLAG_DECRYPTED) {
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if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
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/*
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* Hardware took care of all processing, including
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* replay protection, and stripped the ICV/IV so
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* we cannot do any checks here.
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*/
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return RX_CONTINUE;
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}
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/* let TKIP code verify IV, but skip decryption */
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hwaccel = 1;
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}
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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->addr,
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hdr->addr1, hwaccel, rx->queue,
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&rx->tkip_iv32,
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&rx->tkip_iv16);
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if (res != TKIP_DECRYPT_OK || wpa_test) {
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#ifdef CONFIG_MAC80211_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "%s: TKIP decrypt failed for RX "
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"frame from %s (res=%d)\n", rx->dev->name,
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print_mac(mac, rx->sta->addr), res);
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#endif /* CONFIG_MAC80211_DEBUG */
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return RX_DROP_UNUSABLE;
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}
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/* Trim ICV */
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skb_trim(skb, skb->len - TKIP_ICV_LEN);
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/* Remove IV */
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memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
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skb_pull(skb, 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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int encrypted)
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{
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u16 fc;
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int a4_included, qos_included;
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u8 qos_tid, *fc_pos, *data, *sa, *da;
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int len_a;
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size_t data_len;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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fc_pos = (u8 *) &hdr->frame_control;
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fc = fc_pos[0] ^ (fc_pos[1] << 8);
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a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
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(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
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ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
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data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
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if (qos_tid & 0x80) {
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qos_included = 1;
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qos_tid &= 0x0f;
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} else
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qos_included = 0;
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/* First block, b_0 */
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b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
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/* Nonce: QoS Priority | A2 | PN */
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b_0[1] = qos_tid;
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memcpy(&b_0[2], hdr->addr2, 6);
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memcpy(&b_0[8], pn, CCMP_PN_LEN);
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/* l(m) */
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b_0[14] = (data_len >> 8) & 0xff;
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b_0[15] = data_len & 0xff;
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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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len_a = a4_included ? 28 : 22;
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if (qos_included)
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len_a += 2;
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aad[0] = 0; /* (len_a >> 8) & 0xff; */
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aad[1] = len_a & 0xff;
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/* Mask FC: zero subtype b4 b5 b6 */
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aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6));
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/* Retry, PwrMgt, MoreData; set Protected */
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aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6);
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memcpy(&aad[4], &hdr->addr1, 18);
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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, 6);
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aad[30] = 0;
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aad[31] = 0;
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} else
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memset(&aad[24], 0, 8);
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if (qos_included) {
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u8 *dpos = &aad[a4_included ? 30 : 24];
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/* Mask QoS Control field */
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dpos[0] = qos_tid;
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dpos[1] = 0;
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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 int 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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return (hdr[3] >> 6) & 0x03;
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}
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static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx,
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struct sk_buff *skb, int test)
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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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int hdrlen, len, tailneed;
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u16 fc;
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u8 *pos, *pn, *b_0, *aad, *scratch;
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int i;
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scratch = key->u.ccmp.tx_crypto_buf;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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fc = le16_to_cpu(hdr->frame_control);
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hdrlen = ieee80211_get_hdrlen(fc);
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len = skb->len - hdrlen;
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if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
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tailneed = 0;
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else
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tailneed = CCMP_MIC_LEN;
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if ((skb_headroom(skb) < CCMP_HDR_LEN ||
|
|
skb_tailroom(skb) < tailneed)) {
|
|
I802_DEBUG_INC(tx->local->tx_expand_skb_head);
|
|
if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
|
|
GFP_ATOMIC)))
|
|
return -1;
|
|
}
|
|
|
|
pos = skb_push(skb, CCMP_HDR_LEN);
|
|
memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
|
|
hdr = (struct ieee80211_hdr *) pos;
|
|
pos += hdrlen;
|
|
|
|
/* PN = PN + 1 */
|
|
pn = key->u.ccmp.tx_pn;
|
|
|
|
for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
|
|
pn[i]++;
|
|
if (pn[i])
|
|
break;
|
|
}
|
|
|
|
ccmp_pn2hdr(pos, pn, key->conf.keyidx);
|
|
|
|
if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
|
|
/* hwaccel - with preallocated room for CCMP header */
|
|
tx->control->hw_key = &tx->key->conf;
|
|
return 0;
|
|
}
|
|
|
|
pos += CCMP_HDR_LEN;
|
|
ccmp_special_blocks(skb, pn, b_0, aad, 0);
|
|
ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
|
|
pos, skb_put(skb, CCMP_MIC_LEN));
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
ieee80211_tx_result
|
|
ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
|
|
{
|
|
struct sk_buff *skb = tx->skb;
|
|
int test = 0;
|
|
|
|
tx->control->icv_len = CCMP_MIC_LEN;
|
|
tx->control->iv_len = CCMP_HDR_LEN;
|
|
ieee80211_tx_set_protected(tx);
|
|
|
|
if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
|
|
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
|
|
/* hwaccel - with no need for preallocated room for CCMP "
|
|
* header or MIC fields */
|
|
tx->control->hw_key = &tx->key->conf;
|
|
return TX_CONTINUE;
|
|
}
|
|
|
|
if (ccmp_encrypt_skb(tx, skb, test) < 0)
|
|
return TX_DROP;
|
|
|
|
if (tx->extra_frag) {
|
|
int i;
|
|
for (i = 0; i < tx->num_extra_frag; i++) {
|
|
if (ccmp_encrypt_skb(tx, tx->extra_frag[i], test)
|
|
< 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;
|
|
u16 fc;
|
|
int hdrlen;
|
|
struct ieee80211_key *key = rx->key;
|
|
struct sk_buff *skb = rx->skb;
|
|
u8 pn[CCMP_PN_LEN];
|
|
int data_len;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
fc = le16_to_cpu(hdr->frame_control);
|
|
hdrlen = ieee80211_get_hdrlen(fc);
|
|
|
|
if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
|
|
return RX_CONTINUE;
|
|
|
|
data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
|
|
if (!rx->sta || data_len < 0)
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
|
|
(rx->status->flag & RX_FLAG_IV_STRIPPED))
|
|
return RX_CONTINUE;
|
|
|
|
(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
|
|
|
|
if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
|
u8 *ppn = key->u.ccmp.rx_pn[rx->queue];
|
|
|
|
printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
|
|
"%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
|
|
"%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
|
|
print_mac(mac, rx->sta->addr),
|
|
pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
|
|
ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
|
key->u.ccmp.replays++;
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
|
|
if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
|
|
/* hardware didn't decrypt/verify MIC */
|
|
u8 *scratch, *b_0, *aad;
|
|
|
|
scratch = key->u.ccmp.rx_crypto_buf;
|
|
b_0 = scratch + 3 * AES_BLOCK_LEN;
|
|
aad = scratch + 4 * AES_BLOCK_LEN;
|
|
|
|
ccmp_special_blocks(skb, pn, b_0, aad, 1);
|
|
|
|
if (ieee80211_aes_ccm_decrypt(
|
|
key->u.ccmp.tfm, scratch, b_0, aad,
|
|
skb->data + hdrlen + CCMP_HDR_LEN, data_len,
|
|
skb->data + skb->len - CCMP_MIC_LEN,
|
|
skb->data + hdrlen + CCMP_HDR_LEN)) {
|
|
#ifdef CONFIG_MAC80211_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "%s: CCMP decrypt failed "
|
|
"for RX frame from %s\n", rx->dev->name,
|
|
print_mac(mac, rx->sta->addr));
|
|
#endif /* CONFIG_MAC80211_DEBUG */
|
|
return RX_DROP_UNUSABLE;
|
|
}
|
|
}
|
|
|
|
memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
|
|
|
|
/* Remove CCMP header and MIC */
|
|
skb_trim(skb, skb->len - CCMP_MIC_LEN);
|
|
memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
|
|
skb_pull(skb, CCMP_HDR_LEN);
|
|
|
|
return RX_CONTINUE;
|
|
}
|