+++ /dev/null
-/*
- * Copyright 2002-2004, Instant802 Networks, Inc.
- *
- * 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/config.h>
-#include <linux/version.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/compiler.h>
-#include <linux/wireless.h>
-#include <net/iw_handler.h>
-
-#include <net/ieee80211.h>
-#include <net/ieee80211_common.h>
-#include "ieee80211_i.h"
-#include "michael.h"
-#include "tkip.h"
-#include "aes_ccm.h"
-#include "wpa.h"
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
-#include "hostapd_ioctl.h"
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
-
-#define MICHAEL_MIC_HWACCEL
-
-
-int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
- u8 *qos_tid, u8 **data, size_t *data_len)
-{
- struct ieee80211_hdr *hdr;
- size_t hdrlen;
- u16 fc;
- int a4_included;
- u8 *pos;
-
- hdr = (struct ieee80211_hdr *) skb->data;
- fc = le16_to_cpu(hdr->frame_control);
-
- hdrlen = 24;
- if ((fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) ==
- (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
- hdrlen += ETH_ALEN;
- *sa = hdr->addr4;
- *da = hdr->addr3;
- } else if (fc & WLAN_FC_FROMDS) {
- *sa = hdr->addr3;
- *da = hdr->addr1;
- } else if (fc & WLAN_FC_TODS) {
- *sa = hdr->addr2;
- *da = hdr->addr3;
- } else {
- *sa = hdr->addr2;
- *da = hdr->addr1;
- }
-
- if (fc & 0x80)
- hdrlen += 2;
-
- *data = skb->data + hdrlen;
- *data_len = skb->len - hdrlen;
-
- a4_included = (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
- (WLAN_FC_TODS | WLAN_FC_FROMDS);
- if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA &&
- WLAN_FC_GET_STYPE(fc) & 0x08) {
- pos = (u8 *) &hdr->addr4;
- if (a4_included)
- pos += 6;
- *qos_tid = pos[0] & 0x0f;
- *qos_tid |= 0x80; /* qos_included flag */
- } else
- *qos_tid = 0;
-
- return skb->len < hdrlen ? -1 : 0;
-}
-
-
-ieee80211_txrx_result
-ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
-{
- u8 *data, *sa, *da, *key, *mic, qos_tid;
- size_t data_len;
- u16 fc;
- struct sk_buff *skb = tx->skb;
- int authenticator;
-#if defined(CONFIG_HOSTAPD_WPA_TESTING) || defined(MICHAEL_MIC_HWACCEL)
- int wpa_test = 0;
-#endif
-
- fc = tx->fc;
-
- if (!tx->key || tx->key->alg != ALG_TKIP || skb->len < 24 ||
- !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
-
- if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
- return TXRX_DROP;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if ((tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) ||
- (!tx->u.tx.unicast &&
- tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC)) {
- wpa_test = 1;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
-#ifdef MICHAEL_MIC_HWACCEL
- if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
- !tx->fragmented && !wpa_test) {
- /* hwaccel - with no need for preallocated room for Michael MIC
- */
- return TXRX_CONTINUE;
- }
-#endif /* MICHAEL_MIC_HWACCEL */
-
- if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
- I802_DEBUG_INC(tx->local->tx_expand_skb_head);
- if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
- MICHAEL_MIC_LEN + TKIP_ICV_LEN,
- GFP_ATOMIC))) {
- printk(KERN_DEBUG "%s: failed to allocate more memory "
- "for Michael MIC\n", tx->dev->name);
- return TXRX_DROP;
- }
- }
-
-#if 0
- authenticator = fc & WLAN_FC_FROMDS; /* FIX */
-#else
- authenticator = 1;
-#endif
- key = &tx->key->key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
- ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
- mic = skb_put(skb, MICHAEL_MIC_LEN);
- michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) {
- printk(KERN_INFO "%s: WPA testing - corrupting TX Michael MIC "
- "for STA " MACSTR "\n",
- tx->dev->name, MAC2STR(tx->sta->addr));
- tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
- tx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_MIC;
- tx->wpa_test = 1;
- mic[0]++;
- } else if (!tx->u.tx.unicast &&
- tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_MIC) {
- printk(KERN_INFO "%s: WPA testing - corrupting TX Michael MIC "
- "for Group Key\n", tx->dev->name);
- tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
- tx->local->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_MIC;
- tx->wpa_test = 1;
- mic[0]++;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- return TXRX_CONTINUE;
-}
-
-
-ieee80211_txrx_result
-ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
-{
- u8 *data, *sa, *da, *key = NULL, qos_tid;
- size_t data_len;
- u16 fc;
- u8 mic[MICHAEL_MIC_LEN];
- struct sk_buff *skb = rx->skb;
- int authenticator = 1, wpa_test = 0;
-
- fc = rx->fc;
-
- /* If device handles decryption totally, skip this check */
- if (rx->local->hw->device_hides_wep ||
- rx->local->hw->device_strips_mic)
- return TXRX_CONTINUE;
-
- if (!rx->key || rx->key->alg != ALG_TKIP ||
- !(rx->fc & WLAN_FC_ISWEP) || !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_MIC) {
- wpa_test = 1;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
-#ifdef MICHAEL_MIC_HWACCEL
- if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
- !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
- if (rx->local->hw->wep_include_iv) {
- if (skb->len < MICHAEL_MIC_LEN)
- return TXRX_DROP;
- }
- /* Need to verify Michael MIC sometimes in software even when
- * hwaccel is used. Atheros ar5212: fragmented frames and QoS
- * frames. */
- if (!rx->fragmented && !wpa_test)
- goto remove_mic;
- }
-#endif /* MICHAEL_MIC_HWACCEL */
-
- if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
- || data_len < MICHAEL_MIC_LEN)
- return TXRX_DROP;
-
- data_len -= MICHAEL_MIC_LEN;
-
-#if 0
- authenticator = fc & WLAN_FC_TODS; /* FIX */
-#else
- authenticator = 1;
-#endif
- key = &rx->key->key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
- ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
- michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_MIC) {
- printk(KERN_INFO "%s: WPA testing - corrupting RX Michael MIC "
- "for STA " MACSTR "\n",
- rx->dev->name, MAC2STR(rx->sta->addr));
- rx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_RX_MIC;
- mic[0]++;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
- if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- int i;
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
- printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
- MACSTR "\n", rx->dev->name, MAC2STR(sa));
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- printk(KERN_DEBUG " received");
- for (i = 0; i < MICHAEL_MIC_LEN; i++)
- printk(" %02x", data[data_len + i]);
- printk(" expected");
- for (i = 0; i < MICHAEL_MIC_LEN; i++)
- printk(" %02x", mic[i]);
- printk("\n");
- printk(KERN_DEBUG " SA=" MACSTR " DA=" MACSTR " key",
- MAC2STR(sa), MAC2STR(da));
- for (i = 0; i < 8; i++)
- printk(" %02x", key[i]);
- printk(" (%d)\n", authenticator);
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- do {
- struct ieee80211_hdr *hdr;
- union iwreq_data wrqu;
- char *buf = kmalloc(128, GFP_ATOMIC);
- if (buf == NULL)
- break;
-
- /* TODO: needed parameters: count, key type, TSC */
- hdr = (struct ieee80211_hdr *) skb->data;
- sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
- "keyid=%d %scast addr=" MACSTR ")",
- rx->key->keyidx,
- hdr->addr1[0] & 0x01 ? "broad" : "uni",
- MAC2STR(hdr->addr2));
- memset(&wrqu, 0, sizeof(wrqu));
- wrqu.data.length = strlen(buf);
- wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
- kfree(buf);
- } while (0);
-
- ieee80211_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status,
- ieee80211_msg_michael_mic_failure);
-
- return TXRX_QUEUED;
- }
-
-#ifdef MICHAEL_MIC_HWACCEL
- remove_mic:
-#endif /* MICHAEL_MIC_HWACCEL */
- /* remove Michael MIC from payload */
- skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
-
- return TXRX_CONTINUE;
-}
-
-
-static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
- struct sk_buff *skb, int test)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- struct ieee80211_key *key = tx->key;
- int hdrlen, len, tailneed;
- u16 fc;
- u8 *pos;
-
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
- len = skb->len - hdrlen;
-
- tailneed = (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt)
- ? 0 : TKIP_ICV_LEN;
- if ((skb_headroom(skb) < TKIP_IV_LEN ||
- skb_tailroom(skb) < tailneed)) {
- I802_DEBUG_INC(tx->local->tx_expand_skb_head);
- if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
- GFP_ATOMIC)))
- return -1;
- }
-
- pos = skb_push(skb, TKIP_IV_LEN);
- memmove(pos, pos + TKIP_IV_LEN, hdrlen);
- pos += hdrlen;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_REPLAY)
- goto skip_iv_inc;
-iv_inc:
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- /* Increase IV for the frame */
- key->u.tkip.iv16++;
- if (key->u.tkip.iv16 == 0)
- key->u.tkip.iv32++;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_SKIP_SEQ) {
- test = 0;
- goto iv_inc;
- }
-skip_iv_inc:
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- && !tx->wpa_test
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
- ) {
- /* hwaccel - with preallocated room for IV */
-
- ieee80211_tkip_add_iv(pos, key,
- (u8) (key->u.tkip.iv16 >> 8),
- (u8) (((key->u.tkip.iv16 >> 8) | 0x20) &
- 0x7f),
- (u8) key->u.tkip.iv16);
-
- tx->u.tx.control->key_idx = tx->key->hw_key_idx;
- return 0;
- }
-
- /* Add room for ICV */
- skb_put(skb, TKIP_ICV_LEN);
-
- hdr = (struct ieee80211_hdr *) skb->data;
- ieee80211_tkip_encrypt_data(key, pos, len, hdr->addr2);
- return 0;
-}
-
-
-ieee80211_txrx_result
-ieee80211_tx_h_tkip_encrypt(struct ieee80211_txrx_data *tx)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
- u16 fc;
- struct ieee80211_key *key = tx->key;
- struct sk_buff *skb = tx->skb;
- int wpa_test = 0, test = 0;
-
- fc = le16_to_cpu(hdr->frame_control);
-
- if (!key || key->alg != ALG_TKIP || !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
-
- tx->u.tx.control->icv_len = TKIP_ICV_LEN;
- tx->u.tx.control->iv_len = TKIP_IV_LEN;
- ieee80211_tx_set_iswep(tx);
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if ((tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) ||
- (!tx->u.tx.unicast &&
- tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV)) {
- wpa_test = 1;
- }
-
- if (tx->sta) {
- test = tx->sta->wpa_trigger;
- tx->sta->wpa_trigger &=
- ~(WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
- WPA_TRIGGER_TX_SKIP_SEQ);
- } else {
- test = tx->local->wpa_trigger;
- tx->local->wpa_trigger &=
- ~(WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
- WPA_TRIGGER_TX_SKIP_SEQ);
- }
- if (test &
- (WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
- WPA_TRIGGER_TX_SKIP_SEQ)) {
- printk(KERN_INFO "%s: WPA testing - TKIP TX packet number "
- "%s%s%s%s\n", tx->dev->name,
- tx->sta ? "[UNICAST]" : "[MULTICAST]",
- test & WPA_TRIGGER_TX_REPLAY ? "[REPLAY]" : "",
- test & WPA_TRIGGER_TX_REPLAY_FRAG ?
- "[REPLAY FRAG]" : "",
- test & WPA_TRIGGER_TX_SKIP_SEQ ? "[SKIP SEQ]" : "");
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
- !tx->local->hw->wep_include_iv && !wpa_test) {
- /* hwaccel - with no need for preallocated room for IV/ICV */
- tx->u.tx.control->key_idx = tx->key->hw_key_idx;
- return TXRX_CONTINUE;
- }
-
- if (tkip_encrypt_skb(tx, skb, test) < 0)
- return TXRX_DROP;
-
- if (tx->u.tx.extra_frag) {
- int i;
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_REPLAY_FRAG)
- test |= WPA_TRIGGER_TX_REPLAY;
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
- for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
- if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
- < 0)
- return TXRX_DROP;
- }
- }
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (tx->sta && tx->sta->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) {
- printk(KERN_INFO "%s: WPA testing - corrupting TX TKIP ICV "
- "for STA " MACSTR "\n",
- tx->dev->name, MAC2STR(tx->sta->addr));
- tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
- tx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_ICV;
- skb->data[skb->len - 1]++;
- } else if (!tx->u.tx.unicast &&
- tx->local->wpa_trigger & WPA_TRIGGER_FAIL_TX_ICV) {
- printk(KERN_INFO "%s: WPA testing - corrupting TX TKIP ICV "
- "for Group Key\n",
- tx->dev->name);
- tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
- tx->local->wpa_trigger &= ~WPA_TRIGGER_FAIL_TX_ICV;
- skb->data[skb->len - 1]++;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- return TXRX_CONTINUE;
-}
-
-
-ieee80211_txrx_result
-ieee80211_rx_h_tkip_decrypt(struct ieee80211_txrx_data *rx)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
- u16 fc;
- int hdrlen, res, hwaccel = 0, wpa_test = 0;
- struct ieee80211_key *key = rx->key;
- struct sk_buff *skb = rx->skb;
-
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
-
- if (!rx->key || rx->key->alg != ALG_TKIP ||
- !(rx->fc & WLAN_FC_ISWEP) ||
- WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA)
- return TXRX_CONTINUE;
-
- if (!rx->sta || skb->len - hdrlen < 12)
- return TXRX_DROP;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (rx->sta && rx->sta->wpa_trigger & WPA_TRIGGER_FAIL_RX_ICV) {
- printk(KERN_INFO "%s: WPA testing - corrupting RX TKIP ICV "
- "for STA " MACSTR "\n",
- rx->dev->name, MAC2STR(rx->sta->addr));
- rx->sta->wpa_trigger &= ~WPA_TRIGGER_FAIL_RX_ICV;
- skb->data[skb->len - 1]++;
- wpa_test = 1;
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
- !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
- if (!rx->local->hw->wep_include_iv) {
- /* Hardware takes care of all processing, including
- * replay protection, so no need to continue here. */
- return TXRX_CONTINUE;
- }
-
- /* let TKIP code verify IV, but skip decryption */
- hwaccel = 1;
- }
-
- res = ieee80211_tkip_decrypt_data(key, skb->data + hdrlen,
- skb->len - hdrlen, rx->sta->addr,
- hwaccel, rx->u.rx.queue);
- if (res != TKIP_DECRYPT_OK || wpa_test) {
- printk(KERN_DEBUG "%s: TKIP decrypt failed for RX frame from "
- MACSTR " (res=%d)\n",
- rx->dev->name, MAC2STR(rx->sta->addr), res);
- return TXRX_DROP;
- }
-
- /* Trim ICV */
- skb_trim(skb, skb->len - TKIP_ICV_LEN);
-
- /* Remove IV */
- memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
- skb_pull(skb, TKIP_IV_LEN);
-
- return TXRX_CONTINUE;
-}
-
-
-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
- int encrypted)
-{
- u16 fc;
- int a4_included, qos_included;
- u8 qos_tid, *fc_pos, *data, *sa, *da;
- int len_a;
- size_t data_len;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-
- fc_pos = (u8 *) &hdr->frame_control;
- fc = fc_pos[0] ^ (fc_pos[1] << 8);
- a4_included = (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
- (WLAN_FC_TODS | WLAN_FC_FROMDS);
-
- ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
- data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
- if (qos_tid & 0x80) {
- qos_included = 1;
- qos_tid &= 0x0f;
- } else
- qos_included = 0;
- /* First block, b_0 */
-
- b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
- /* Nonce: QoS Priority | A2 | PN */
- b_0[1] = qos_tid;
- memcpy(&b_0[2], hdr->addr2, 6);
- memcpy(&b_0[8], pn, CCMP_PN_LEN);
- /* l(m) */
- b_0[14] = (data_len >> 8) & 0xff;
- b_0[15] = data_len & 0xff;
-
-
- /* AAD (extra authenticate-only data) / masked 802.11 header
- * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
-
- len_a = a4_included ? 28 : 22;
- if (qos_included)
- len_a += 2;
-
- aad[0] = 0; /* (len_a >> 8) & 0xff; */
- aad[1] = len_a & 0xff;
- /* Mask FC: zero subtype b4 b5 b6 */
- aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6));
- /* Retry, PwrMgt, MoreData; set Protected */
- aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6);
- memcpy(&aad[4], &hdr->addr1, 18);
-
- /* Mask Seq#, leave Frag# */
- aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
- aad[23] = 0;
- if (a4_included) {
- memcpy(&aad[24], hdr->addr4, 6);
- aad[30] = 0;
- aad[31] = 0;
- } else
- memset(&aad[24], 0, 8);
- if (qos_included) {
- u8 *dpos = &aad[a4_included ? 30 : 24];
-
- /* Mask QoS Control field */
- dpos[0] = qos_tid;
- dpos[1] = 0;
- }
-}
-
-
-static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
-{
- hdr[0] = pn[5];
- hdr[1] = pn[4];
- hdr[2] = 0;
- hdr[3] = 0x20 | (key_id << 6);
- hdr[4] = pn[3];
- hdr[5] = pn[2];
- hdr[6] = pn[1];
- hdr[7] = pn[0];
-}
-
-
-static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr)
-{
- pn[0] = hdr[7];
- pn[1] = hdr[6];
- pn[2] = hdr[5];
- pn[3] = hdr[4];
- pn[4] = hdr[1];
- pn[5] = hdr[0];
- return (hdr[3] >> 6) & 0x03;
-}
-
-
-static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
- struct sk_buff *skb, int test)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- struct ieee80211_key *key = tx->key;
- int hdrlen, len, tailneed;
- u16 fc;
- u8 *pos, *pn;
- u8 b_0[AES_BLOCK_LEN], aad[2 * AES_BLOCK_LEN];
- int i;
-
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
- len = skb->len - hdrlen;
-
- tailneed = (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt)
- ? 0 : CCMP_MIC_LEN;
-
- 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;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_REPLAY)
- goto skip_pn_inc;
-pn_inc:
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
- pn[i]++;
- if (pn[i])
- break;
- }
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_SKIP_SEQ) {
- test = 0;
- goto pn_inc;
- }
-skip_pn_inc:
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- ccmp_pn2hdr(pos, pn, key->keyidx);
-
- if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt) {
- /* hwaccel - with preallocated room for CCMP header */
- tx->u.tx.control->key_idx = tx->key->hw_key_idx;
- return 0;
- }
-
- pos += CCMP_HDR_LEN;
- ccmp_special_blocks(skb, pn, b_0, aad, 0);
- ieee80211_aes_ccm_encrypt(key->u.ccmp.aes_state, b_0, aad, pos, len,
- pos, skb_put(skb, CCMP_MIC_LEN));
-
- return 0;
-}
-
-
-ieee80211_txrx_result
-ieee80211_tx_h_ccmp_encrypt(struct ieee80211_txrx_data *tx)
-{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
- struct ieee80211_key *key = tx->key;
- u16 fc;
- struct sk_buff *skb = tx->skb;
- int test = 0;
-
- fc = le16_to_cpu(hdr->frame_control);
-
- if (!key || key->alg != ALG_CCMP || !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
-
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (tx->sta) {
- test = tx->sta->wpa_trigger;
- tx->sta->wpa_trigger = 0;
- } else {
- test = tx->local->wpa_trigger;
- tx->local->wpa_trigger = 0;
- }
- if (test &
- (WPA_TRIGGER_TX_REPLAY | WPA_TRIGGER_TX_REPLAY_FRAG |
- WPA_TRIGGER_TX_SKIP_SEQ)) {
- printk(KERN_INFO "%s: WPA testing - CCMP TX packet number "
- "%s%s%s%s\n", tx->dev->name,
- tx->sta ? "[UNICAST]" : "[MULTICAST]",
- test & WPA_TRIGGER_TX_REPLAY ? "[REPLAY]" : "",
- test & WPA_TRIGGER_TX_REPLAY_FRAG ?
- "[REPLAY FRAG]" : "",
- test & WPA_TRIGGER_TX_SKIP_SEQ ? "[SKIP SEQ]" : "");
- }
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
-
- tx->u.tx.control->icv_len = CCMP_MIC_LEN;
- tx->u.tx.control->iv_len = CCMP_HDR_LEN;
- ieee80211_tx_set_iswep(tx);
-
- if (!tx->key->force_sw_encrypt && !tx->local->conf.sw_decrypt &&
- !tx->local->hw->wep_include_iv) {
- /* hwaccel - with no need for preallocated room for CCMP "
- * header or MIC fields */
- tx->u.tx.control->key_idx = tx->key->hw_key_idx;
- return TXRX_CONTINUE;
- }
-
- if (ccmp_encrypt_skb(tx, skb, test) < 0)
- return TXRX_DROP;
-
- if (tx->u.tx.extra_frag) {
- int i;
-#ifdef CONFIG_HOSTAPD_WPA_TESTING
- if (test & WPA_TRIGGER_TX_REPLAY_FRAG)
- test |= WPA_TRIGGER_TX_REPLAY;
-#endif /* CONFIG_HOSTAPD_WPA_TESTING */
- for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
- if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
- < 0)
- return TXRX_DROP;
- }
- }
-
- return TXRX_CONTINUE;
-}
-
-
-ieee80211_txrx_result
-ieee80211_rx_h_ccmp_decrypt(struct ieee80211_txrx_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 b_0[AES_BLOCK_LEN], aad[2 * AES_BLOCK_LEN];
- u8 pn[CCMP_PN_LEN];
- int data_len;
-
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
-
- if (!rx->key || rx->key->alg != ALG_CCMP ||
- !(rx->fc & WLAN_FC_ISWEP) ||
- WLAN_FC_GET_TYPE(rx->fc) != WLAN_FC_TYPE_DATA)
- return TXRX_CONTINUE;
-
- data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
- if (!rx->sta || data_len < 0)
- return TXRX_DROP;
-
- if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
- !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt &&
- !rx->local->hw->wep_include_iv)
- return TXRX_CONTINUE;
-
- (void) ccmp_hdr2pn(pn, skb->data + hdrlen);
-
- if (memcmp(pn, key->u.ccmp.rx_pn[rx->u.rx.queue], CCMP_PN_LEN) <= 0) {
-#ifdef CONFIG_IEEE80211_DEBUG
- u8 *ppn = key->u.ccmp.rx_pn[rx->u.rx.queue];
- printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
- MACSTR " (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
- "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
- MAC2STR(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_IEEE80211_DEBUG */
- key->u.ccmp.replays++;
- return TXRX_DROP;
- }
-
- if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
- !rx->key->force_sw_encrypt && !rx->local->conf.sw_decrypt) {
- /* hwaccel has already decrypted frame and verified MIC */
- } else {
- ccmp_special_blocks(skb, pn, b_0, aad, 1);
-
- if (ieee80211_aes_ccm_decrypt(
- key->u.ccmp.aes_state, b_0, aad,
- skb->data + hdrlen + CCMP_HDR_LEN, data_len,
- skb->data + skb->len - CCMP_MIC_LEN,
- skb->data + hdrlen + CCMP_HDR_LEN)) {
- printk(KERN_DEBUG "%s: CCMP decrypt failed for RX "
- "frame from " MACSTR "\n", rx->dev->name,
- MAC2STR(rx->sta->addr));
- return TXRX_DROP;
- }
- }
-
- memcpy(key->u.ccmp.rx_pn[rx->u.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 TXRX_CONTINUE;
-}
-
projects / openwrt / svn-archive / archive.git / blobdiff