diff options
Diffstat (limited to 'package/mac80211/src/net/mac80211/wpa.c')
| -rw-r--r-- | package/mac80211/src/net/mac80211/wpa.c | 604 |
1 files changed, 0 insertions, 604 deletions
diff --git a/package/mac80211/src/net/mac80211/wpa.c b/package/mac80211/src/net/mac80211/wpa.c deleted file mode 100644 index b35e51c..0000000 --- a/package/mac80211/src/net/mac80211/wpa.c +++ /dev/null @@ -1,604 +0,0 @@ -/* - * 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/netdevice.h> -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/skbuff.h> -#include <linux/compiler.h> -#include <net/mac80211.h> - -#include "ieee80211_i.h" -#include "michael.h" -#include "tkip.h" -#include "aes_ccm.h" -#include "wpa.h" - -static 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 & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) == - (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { - hdrlen += ETH_ALEN; - *sa = hdr->addr4; - *da = hdr->addr3; - } else if (fc & IEEE80211_FCTL_FROMDS) { - *sa = hdr->addr3; - *da = hdr->addr1; - } else if (fc & IEEE80211_FCTL_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 & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS); - if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && - fc & IEEE80211_STYPE_QOS_DATA) { - 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_tx_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; - int wpa_test = 0; - - fc = tx->fc; - - if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || - !WLAN_FC_DATA_PRESENT(fc)) - return TX_CONTINUE; - - if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)) - return TX_DROP; - - if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && - !(tx->flags & IEEE80211_TXRXD_FRAGMENTED) && - !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) && - !wpa_test) { - /* hwaccel - with no need for preallocated room for Michael MIC - */ - return TX_CONTINUE; - } - - 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 TX_DROP; - } - } - -#if 0 - authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ -#else - authenticator = 1; -#endif - key = &tx->key->conf.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); - - return TX_CONTINUE; -} - - -ieee80211_rx_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; - DECLARE_MAC_BUF(mac); - - fc = rx->fc; - - /* - * No way to verify the MIC if the hardware stripped it - */ - if (rx->u.rx.status->flag & RX_FLAG_MMIC_STRIPPED) - return RX_CONTINUE; - - if (!rx->key || rx->key->conf.alg != ALG_TKIP || - !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc)) - return RX_CONTINUE; - - if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len) - || data_len < MICHAEL_MIC_LEN) - return RX_DROP_UNUSABLE; - - data_len -= MICHAEL_MIC_LEN; - -#if 0 - authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ -#else - authenticator = 1; -#endif - key = &rx->key->conf.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); - if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { - if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) - return RX_DROP_UNUSABLE; - - printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from " - "%s\n", rx->dev->name, print_mac(mac, sa)); - - mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx, - (void *) skb->data); - return RX_DROP_UNUSABLE; - } - - /* remove Michael MIC from payload */ - skb_trim(skb, skb->len - MICHAEL_MIC_LEN); - - /* update IV in key information to be able to detect replays */ - rx->key->u.tkip.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32; - rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16; - - return RX_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; - - if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) - tailneed = 0; - else - tailneed = 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; - - /* Increase IV for the frame */ - key->u.tkip.iv16++; - if (key->u.tkip.iv16 == 0) - key->u.tkip.iv32++; - - if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { - hdr = (struct ieee80211_hdr *)skb->data; - - /* 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->conf.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(tx->local->wep_tx_tfm, - key, pos, len, hdr->addr2); - return 0; -} - - -ieee80211_tx_result -ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx) -{ - struct sk_buff *skb = tx->skb; - int wpa_test = 0, test = 0; - - tx->u.tx.control->icv_len = TKIP_ICV_LEN; - tx->u.tx.control->iv_len = TKIP_IV_LEN; - ieee80211_tx_set_iswep(tx); - - if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && - !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) && - !wpa_test) { - /* hwaccel - with no need for preallocated room for IV/ICV */ - tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx; - return TX_CONTINUE; - } - - if (tkip_encrypt_skb(tx, skb, test) < 0) - return TX_DROP; - - if (tx->u.tx.extra_frag) { - int i; - 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 TX_DROP; - } - } - - return TX_CONTINUE; -} - - -ieee80211_rx_result -ieee80211_crypto_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; - 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; - - if (!rx->sta || skb->len - hdrlen < 12) - return RX_DROP_UNUSABLE; - - if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) { - if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) { - /* - * Hardware took care of all processing, including - * replay protection, and stripped the ICV/IV so - * we cannot do any checks here. - */ - return RX_CONTINUE; - } - - /* let TKIP code verify IV, but skip decryption */ - hwaccel = 1; - } - - res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, - key, skb->data + hdrlen, - skb->len - hdrlen, rx->sta->addr, - hwaccel, rx->u.rx.queue, - &rx->u.rx.tkip_iv32, - &rx->u.rx.tkip_iv16); - if (res != TKIP_DECRYPT_OK || wpa_test) { -#ifdef CONFIG_MAC80211_DEBUG - if (net_ratelimit()) - printk(KERN_DEBUG "%s: TKIP decrypt failed for RX " - "frame from %s (res=%d)\n", rx->dev->name, - print_mac(mac, rx->sta->addr), res); -#endif /* CONFIG_MAC80211_DEBUG */ - return RX_DROP_UNUSABLE; - } - - /* 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 RX_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 & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == - (IEEE80211_FCTL_TODS | IEEE80211_FCTL_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, *b_0, *aad, *scratch; - int i; - - scratch = key->u.ccmp.tx_crypto_buf; - b_0 = scratch + 3 * AES_BLOCK_LEN; - aad = scratch + 4 * AES_BLOCK_LEN; - - fc = le16_to_cpu(hdr->frame_control); - hdrlen = ieee80211_get_hdrlen(fc); - len = skb->len - hdrlen; - - if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) - tailneed = 0; - else - tailneed = 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; - - 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->u.tx.control->key_idx = key->conf.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.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_txrx_data *tx) -{ - struct sk_buff *skb = tx->skb; - int test = 0; - - 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->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->u.tx.control->key_idx = tx->key->conf.hw_key_idx; - return TX_CONTINUE; - } - - if (ccmp_encrypt_skb(tx, skb, test) < 0) - return TX_DROP; - - if (tx->u.tx.extra_frag) { - int i; - 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 TX_DROP; - } - } - - return TX_CONTINUE; -} - - -ieee80211_rx_result -ieee80211_crypto_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 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->u.rx.status->flag & RX_FLAG_DECRYPTED) && - (rx->u.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->u.rx.queue], CCMP_PN_LEN) <= 0) { -#ifdef CONFIG_MAC80211_DEBUG - u8 *ppn = key->u.ccmp.rx_pn[rx->u.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->u.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->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 RX_CONTINUE; -} |