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@@ -22,6 +22,8 @@
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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 "aes_gmac.h"
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+#include "aes_gcm.h"
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#include "wpa.h"
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ieee80211_tx_result
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@@ -393,7 +395,8 @@ static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
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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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+static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
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+ unsigned int mic_len)
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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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@@ -424,7 +427,7 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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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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+ tail = 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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@@ -459,21 +462,22 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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pos += IEEE80211_CCMP_HDR_LEN;
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ccmp_special_blocks(skb, pn, b_0, aad);
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ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
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- skb_put(skb, IEEE80211_CCMP_MIC_LEN));
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+ skb_put(skb, mic_len), mic_len);
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return 0;
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}
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ieee80211_tx_result
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-ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
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+ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
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+ unsigned int mic_len)
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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 (ccmp_encrypt_skb(tx, skb) < 0)
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+ if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
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return TX_DROP;
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}
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@@ -482,7 +486,8 @@ ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
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ieee80211_rx_result
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-ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
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+ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
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+ unsigned int mic_len)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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int hdrlen;
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@@ -499,8 +504,7 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
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!ieee80211_is_robust_mgmt_frame(skb))
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return RX_CONTINUE;
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- data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN -
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- IEEE80211_CCMP_MIC_LEN;
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+ data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
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if (!rx->sta || data_len < 0)
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return RX_DROP_UNUSABLE;
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@@ -531,14 +535,14 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
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key->u.ccmp.tfm, b_0, aad,
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skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
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data_len,
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- skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
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+ skb->data + skb->len - mic_len, mic_len))
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return RX_DROP_UNUSABLE;
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}
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memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
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/* Remove CCMP header and MIC */
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- if (pskb_trim(skb, skb->len - IEEE80211_CCMP_MIC_LEN))
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+ if (pskb_trim(skb, skb->len - mic_len))
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return RX_DROP_UNUSABLE;
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memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
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skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
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@@ -546,6 +550,229 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
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return RX_CONTINUE;
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}
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+static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
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+{
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+ __le16 mask_fc;
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+ u8 qos_tid;
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+
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+ memcpy(j_0, hdr->addr2, ETH_ALEN);
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+ memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
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+ j_0[13] = 0;
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+ j_0[14] = 0;
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+ j_0[AES_BLOCK_SIZE - 1] = 0x01;
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+
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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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+ */
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+ put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
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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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+ 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 (!ieee80211_is_mgmt(hdr->frame_control))
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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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+
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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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+
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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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+
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+ if (ieee80211_is_data_qos(hdr->frame_control))
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+ qos_tid = *ieee80211_get_qos_ctl(hdr) &
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+ IEEE80211_QOS_CTL_TID_MASK;
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+ else
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+ qos_tid = 0;
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+
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+ if (ieee80211_has_a4(hdr->frame_control)) {
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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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+
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+static inline void gcmp_pn2hdr(u8 *hdr, const 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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+
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+static inline void gcmp_hdr2pn(u8 *pn, const 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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+
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+static int gcmp_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 j_0[AES_BLOCK_SIZE];
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+
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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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+ /* hwaccel has no need for preallocated room for GCMP
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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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+
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+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
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+ len = skb->len - hdrlen;
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+
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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_GCMP_MIC_LEN;
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+
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+ if (WARN_ON(skb_tailroom(skb) < tail ||
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+ skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
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+ return -1;
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+
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+ pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
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+ memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
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+ skb_set_network_header(skb, skb_network_offset(skb) +
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+ IEEE80211_GCMP_HDR_LEN);
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+
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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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+
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+ hdr = (struct ieee80211_hdr *)pos;
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+ pos += hdrlen;
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+
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+ pn64 = atomic64_inc_return(&key->u.gcmp.tx_pn);
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+
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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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+
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+ gcmp_pn2hdr(pos, pn, key->conf.keyidx);
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+
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+ /* hwaccel - with software GCMP 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_GCMP_HDR_LEN;
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+ gcmp_special_blocks(skb, pn, j_0, aad);
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+ ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
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+ skb_put(skb, IEEE80211_GCMP_MIC_LEN));
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+
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+ return 0;
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+}
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+
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+ieee80211_tx_result
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+ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
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+{
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+ struct sk_buff *skb;
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+
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+ ieee80211_tx_set_protected(tx);
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+
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+ skb_queue_walk(&tx->skbs, skb) {
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+ if (gcmp_encrypt_skb(tx, skb) < 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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+
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+ieee80211_rx_result
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+ieee80211_crypto_gcmp_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;
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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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+ u8 pn[IEEE80211_GCMP_PN_LEN];
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+ int data_len;
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+ int queue;
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+
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+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
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+
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+ if (!ieee80211_is_data(hdr->frame_control) &&
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+ !ieee80211_is_robust_mgmt_frame(skb))
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+ return RX_CONTINUE;
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+
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+ data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN -
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+ IEEE80211_GCMP_MIC_LEN;
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+ if (!rx->sta || data_len < 0)
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+ return RX_DROP_UNUSABLE;
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+
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+ if (status->flag & RX_FLAG_DECRYPTED) {
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+ if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
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+ return RX_DROP_UNUSABLE;
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+ } else {
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+ if (skb_linearize(rx->skb))
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+ return RX_DROP_UNUSABLE;
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+ }
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+
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+ gcmp_hdr2pn(pn, skb->data + hdrlen);
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+
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+ queue = rx->security_idx;
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+
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+ if (memcmp(pn, key->u.gcmp.rx_pn[queue], IEEE80211_GCMP_PN_LEN) <= 0) {
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+ key->u.gcmp.replays++;
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+ return RX_DROP_UNUSABLE;
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+ }
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+
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+ if (!(status->flag & RX_FLAG_DECRYPTED)) {
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+ u8 aad[2 * AES_BLOCK_SIZE];
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+ u8 j_0[AES_BLOCK_SIZE];
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+ /* hardware didn't decrypt/verify MIC */
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+ gcmp_special_blocks(skb, pn, j_0, aad);
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+
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+ if (ieee80211_aes_gcm_decrypt(
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+ key->u.gcmp.tfm, j_0, aad,
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+ skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
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+ data_len,
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+ skb->data + skb->len - IEEE80211_GCMP_MIC_LEN))
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+ return RX_DROP_UNUSABLE;
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+ }
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+
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+ memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
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+
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+ /* Remove GCMP header and MIC */
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+ if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN))
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+ return RX_DROP_UNUSABLE;
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+ memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
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+ skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
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+
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+ return RX_CONTINUE;
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+}
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+
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static ieee80211_tx_result
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ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
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struct sk_buff *skb)
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@@ -729,6 +956,48 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
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return TX_CONTINUE;
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}
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+ieee80211_tx_result
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+ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
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+{
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+ struct sk_buff *skb;
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+ struct ieee80211_tx_info *info;
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+ struct ieee80211_key *key = tx->key;
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+ struct ieee80211_mmie_16 *mmie;
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+ u8 aad[20];
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+ u64 pn64;
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+
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+ if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
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+ return TX_DROP;
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+
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+ skb = skb_peek(&tx->skbs);
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+
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+ info = IEEE80211_SKB_CB(skb);
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+
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+ if (info->control.hw_key)
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+ return TX_CONTINUE;
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+
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+ if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
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+ return TX_DROP;
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+
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+ mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
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+ mmie->element_id = WLAN_EID_MMIE;
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+ mmie->length = sizeof(*mmie) - 2;
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+ mmie->key_id = cpu_to_le16(key->conf.keyidx);
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+
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+ /* PN = PN + 1 */
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+ pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
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+
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+ bip_ipn_set64(mmie->sequence_number, pn64);
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+
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+ bip_aad(skb, aad);
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+
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+ /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
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+ */
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+ ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
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+ skb->data + 24, skb->len - 24, mmie->mic);
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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_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
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@@ -780,6 +1049,160 @@ ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
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return RX_CONTINUE;
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}
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+ieee80211_rx_result
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+ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
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+{
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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_key *key = rx->key;
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+ struct ieee80211_mmie_16 *mmie;
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+ u8 aad[20], mic[16], ipn[6];
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+
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+ if (!ieee80211_is_mgmt(hdr->frame_control))
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+ return RX_CONTINUE;
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+
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+ /* management frames are already linear */
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+
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+ if (skb->len < 24 + sizeof(*mmie))
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+ return RX_DROP_UNUSABLE;
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+
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+ mmie = (struct ieee80211_mmie_16 *)
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+ (skb->data + skb->len - sizeof(*mmie));
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+ if (mmie->element_id != WLAN_EID_MMIE ||
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+ mmie->length != sizeof(*mmie) - 2)
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+ return RX_DROP_UNUSABLE; /* Invalid MMIE */
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+
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+ bip_ipn_swap(ipn, mmie->sequence_number);
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+
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+ if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
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+ key->u.aes_cmac.replays++;
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+ return RX_DROP_UNUSABLE;
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+ }
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+
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+ if (!(status->flag & RX_FLAG_DECRYPTED)) {
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+ /* hardware didn't decrypt/verify MIC */
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+ bip_aad(skb, aad);
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+ ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
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+ skb->data + 24, skb->len - 24, mic);
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+ if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
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+ key->u.aes_cmac.icverrors++;
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+ return RX_DROP_UNUSABLE;
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+ }
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+ }
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+
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+ memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
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+
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+ /* Remove MMIE */
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+ skb_trim(skb, skb->len - sizeof(*mmie));
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+
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+ return RX_CONTINUE;
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+}
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+
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+ieee80211_tx_result
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+ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
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+{
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+ struct sk_buff *skb;
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+ struct ieee80211_tx_info *info;
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+ struct ieee80211_key *key = tx->key;
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+ struct ieee80211_mmie_16 *mmie;
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+ struct ieee80211_hdr *hdr;
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+ u8 aad[20];
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+ u64 pn64;
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+ u8 nonce[12];
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+
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+ if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
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+ return TX_DROP;
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+
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+ skb = skb_peek(&tx->skbs);
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+
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+ info = IEEE80211_SKB_CB(skb);
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+
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+ if (info->control.hw_key)
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+ return TX_CONTINUE;
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+
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+ if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
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+ return TX_DROP;
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+
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+ mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
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+ mmie->element_id = WLAN_EID_MMIE;
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+ mmie->length = sizeof(*mmie) - 2;
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+ mmie->key_id = cpu_to_le16(key->conf.keyidx);
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+
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+ /* PN = PN + 1 */
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+ pn64 = atomic64_inc_return(&key->u.aes_gmac.tx_pn);
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+
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+ bip_ipn_set64(mmie->sequence_number, pn64);
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+
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+ bip_aad(skb, aad);
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+
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+ hdr = (struct ieee80211_hdr *)skb->data;
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+ memcpy(nonce, hdr->addr2, ETH_ALEN);
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+ bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
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+
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+ /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
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+ if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
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+ skb->data + 24, skb->len - 24, mmie->mic) < 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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+
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+ieee80211_rx_result
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+ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
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+{
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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_key *key = rx->key;
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+ struct ieee80211_mmie_16 *mmie;
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+ u8 aad[20], mic[16], ipn[6], nonce[12];
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+
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+ if (!ieee80211_is_mgmt(hdr->frame_control))
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+ return RX_CONTINUE;
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+
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+ /* management frames are already linear */
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+
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+ if (skb->len < 24 + sizeof(*mmie))
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+ return RX_DROP_UNUSABLE;
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+
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+ mmie = (struct ieee80211_mmie_16 *)
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+ (skb->data + skb->len - sizeof(*mmie));
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+ if (mmie->element_id != WLAN_EID_MMIE ||
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+ mmie->length != sizeof(*mmie) - 2)
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+ return RX_DROP_UNUSABLE; /* Invalid MMIE */
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+
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+ bip_ipn_swap(ipn, mmie->sequence_number);
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+
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+ if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
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+ key->u.aes_gmac.replays++;
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+ return RX_DROP_UNUSABLE;
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+ }
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+
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+ if (!(status->flag & RX_FLAG_DECRYPTED)) {
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+ /* hardware didn't decrypt/verify MIC */
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+ bip_aad(skb, aad);
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+
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+ memcpy(nonce, hdr->addr2, ETH_ALEN);
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+ memcpy(nonce + ETH_ALEN, ipn, 6);
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+
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+ if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
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+ skb->data + 24, skb->len - 24,
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+ mic) < 0 ||
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+ memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
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+ key->u.aes_gmac.icverrors++;
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+ return RX_DROP_UNUSABLE;
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+ }
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+ }
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+
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+ memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
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+
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+ /* Remove MMIE */
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+ skb_trim(skb, skb->len - sizeof(*mmie));
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+
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+ return RX_CONTINUE;
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+}
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+
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ieee80211_tx_result
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ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
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{
|