forked from luck/tmp_suning_uos_patched
db4d1169d0
In order to RCU-ify sta_info, we need to be able to allocate a key without linking it to an sdata/sta structure (because allocation cannot be done in an rcu critical section). This patch splits up ieee80211_key_alloc() and updates all users appropriately. While at it, this patch fixes a number of race conditions such as finally making key replacement atomic, unfortunately at the expense of more complex code. Note that this patch documents /existing/ bugs with sta info and key interaction, there is currently a race condition when a sta info is freed without holding the RTNL. This will finally be fixed by a followup patch. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* Copyright 2002-2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, 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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#ifndef IEEE80211_KEY_H
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#define IEEE80211_KEY_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/crypto.h>
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#include <linux/rcupdate.h>
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#include <net/mac80211.h>
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/* ALG_TKIP
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* struct ieee80211_key::key is encoded as a 256-bit (32 byte) data block:
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* Temporal Encryption Key (128 bits)
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* Temporal Authenticator Tx MIC Key (64 bits)
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* Temporal Authenticator Rx MIC Key (64 bits)
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*/
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#define WEP_IV_LEN 4
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#define WEP_ICV_LEN 4
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#define ALG_TKIP_KEY_LEN 32
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/* Starting offsets for each key */
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#define ALG_TKIP_TEMP_ENCR_KEY 0
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#define ALG_TKIP_TEMP_AUTH_TX_MIC_KEY 16
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#define ALG_TKIP_TEMP_AUTH_RX_MIC_KEY 24
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#define TKIP_IV_LEN 8
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#define TKIP_ICV_LEN 4
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#define ALG_CCMP_KEY_LEN 16
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#define CCMP_HDR_LEN 8
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#define CCMP_MIC_LEN 8
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#define CCMP_TK_LEN 16
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#define CCMP_PN_LEN 6
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#define NUM_RX_DATA_QUEUES 17
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struct ieee80211_local;
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struct ieee80211_sub_if_data;
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struct sta_info;
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/**
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* enum ieee80211_internal_key_flags - internal key flags
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*
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* @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
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* in the hardware for TX crypto hardware acceleration.
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* @KEY_FLAG_REMOVE_FROM_HARDWARE: Indicates to the key code that this
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* key is present in the hardware (but it cannot be used for
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* hardware acceleration any more!)
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*/
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enum ieee80211_internal_key_flags {
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KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
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KEY_FLAG_REMOVE_FROM_HARDWARE = BIT(1),
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};
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struct ieee80211_key {
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struct ieee80211_local *local;
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struct ieee80211_sub_if_data *sdata;
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struct sta_info *sta;
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struct list_head list;
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unsigned int flags;
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union {
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struct {
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/* last used TSC */
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u32 iv32;
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u16 iv16;
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u16 p1k[5];
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int tx_initialized;
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/* last received RSC */
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u32 iv32_rx[NUM_RX_DATA_QUEUES];
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u16 iv16_rx[NUM_RX_DATA_QUEUES];
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u16 p1k_rx[NUM_RX_DATA_QUEUES][5];
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int rx_initialized[NUM_RX_DATA_QUEUES];
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} tkip;
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struct {
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u8 tx_pn[6];
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u8 rx_pn[NUM_RX_DATA_QUEUES][6];
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struct crypto_cipher *tfm;
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u32 replays; /* dot11RSNAStatsCCMPReplays */
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/* scratch buffers for virt_to_page() (crypto API) */
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#ifndef AES_BLOCK_LEN
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#define AES_BLOCK_LEN 16
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#endif
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u8 tx_crypto_buf[6 * AES_BLOCK_LEN];
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u8 rx_crypto_buf[6 * AES_BLOCK_LEN];
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} ccmp;
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} u;
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/* number of times this key has been used */
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int tx_rx_count;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct {
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struct dentry *stalink;
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struct dentry *dir;
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struct dentry *keylen;
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struct dentry *flags;
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struct dentry *keyidx;
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struct dentry *hw_key_idx;
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struct dentry *tx_rx_count;
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struct dentry *algorithm;
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struct dentry *tx_spec;
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struct dentry *rx_spec;
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struct dentry *replays;
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struct dentry *key;
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struct dentry *ifindex;
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} debugfs;
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#endif
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/*
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* key config, must be last because it contains key
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* material as variable length member
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*/
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struct ieee80211_key_conf conf;
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};
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struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
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int idx,
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size_t key_len,
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const u8 *key_data);
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/*
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* Insert a key into data structures (sdata, sta if necessary)
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* to make it used, free old key.
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*/
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void ieee80211_key_link(struct ieee80211_key *key,
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struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta);
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void ieee80211_key_free(struct ieee80211_key *key);
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void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
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void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
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void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
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void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
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#endif /* IEEE80211_KEY_H */
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