diff options
Diffstat (limited to 'net/mac80211/wpa.c')
| -rw-r--r-- | net/mac80211/wpa.c | 87 |
1 files changed, 31 insertions, 56 deletions
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c index cd35ae76d5b7..5fd8a3e8b5b4 100644 --- a/net/mac80211/wpa.c +++ b/net/mac80211/wpa.c @@ -311,14 +311,17 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) return RX_CONTINUE; } - -static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) +/* + * Calculate AAD for CCMP/GCMP, returning qos_tid since we + * need that in CCMP also for b_0. + */ +static u8 ccmp_gcmp_aad(struct sk_buff *skb, u8 *aad) { + struct ieee80211_hdr *hdr = (void *)skb->data; __le16 mask_fc; int a4_included, mgmt; u8 qos_tid; u16 len_a = 22; - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; /* * Mask FC: zero subtype b4 b5 b6 (if not mgmt) @@ -344,22 +347,6 @@ static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) qos_tid = 0; } - /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC - * mode authentication are not allowed to collide, yet both are derived - * from this vector b_0. We only set L := 1 here to indicate that the - * data size can be represented in (L+1) bytes. The CCM layer will take - * care of storing the data length in the top (L+1) bytes and setting - * and clearing the other bits as is required to derive the two IVs. - */ - b_0[0] = 0x1; - - /* Nonce: Nonce Flags | A2 | PN - * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) - */ - b_0[1] = qos_tid | (mgmt << 4); - memcpy(&b_0[2], hdr->addr2, ETH_ALEN); - memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); - /* AAD (extra authenticate-only data) / masked 802.11 header * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ put_unaligned_be16(len_a, &aad[0]); @@ -378,8 +365,31 @@ static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); aad[24] = qos_tid; } + + return qos_tid; } +static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + u8 qos_tid = ccmp_gcmp_aad(skb, aad); + + /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC + * mode authentication are not allowed to collide, yet both are derived + * from this vector b_0. We only set L := 1 here to indicate that the + * data size can be represented in (L+1) bytes. The CCM layer will take + * care of storing the data length in the top (L+1) bytes and setting + * and clearing the other bits as is required to derive the two IVs. + */ + b_0[0] = 0x1; + + /* Nonce: Nonce Flags | A2 | PN + * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) + */ + b_0[1] = qos_tid | (ieee80211_is_mgmt(hdr->frame_control) << 4); + memcpy(&b_0[2], hdr->addr2, ETH_ALEN); + memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); +} static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) { @@ -573,9 +583,7 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) { - __le16 mask_fc; - u8 qos_tid; - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct ieee80211_hdr *hdr = (void *)skb->data; memcpy(j_0, hdr->addr2, ETH_ALEN); memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); @@ -583,40 +591,7 @@ static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) j_0[14] = 0; j_0[AES_BLOCK_SIZE - 1] = 0x01; - /* AAD (extra authenticate-only data) / masked 802.11 header - * FC | A1 | A2 | A3 | SC | [A4] | [QC] - */ - put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); - /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) - * Retry, PwrMgt, MoreData; set Protected - */ - mask_fc = hdr->frame_control; - mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | - IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); - if (!ieee80211_is_mgmt(hdr->frame_control)) - mask_fc &= ~cpu_to_le16(0x0070); - mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); - - put_unaligned(mask_fc, (__le16 *)&aad[2]); - memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); - - /* Mask Seq#, leave Frag# */ - aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; - aad[23] = 0; - - if (ieee80211_is_data_qos(hdr->frame_control)) - qos_tid = ieee80211_get_tid(hdr); - else - qos_tid = 0; - - if (ieee80211_has_a4(hdr->frame_control)) { - memcpy(&aad[24], hdr->addr4, ETH_ALEN); - aad[30] = qos_tid; - aad[31] = 0; - } else { - memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); - aad[24] = qos_tid; - } + ccmp_gcmp_aad(skb, aad); } static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) |