Skip to content

Commit

Permalink
[PATCH] ieee80211: Hardware crypto and fragmentation offload support
Browse files Browse the repository at this point in the history 
tree 5322d496af90d03ffbec27292dc1a6268a746ede
parent 6c9364386ccb786e4a84427ab3ad712f0b7b8904
author James Ketrenos <[email protected]> 1124432367 -0500
committer James Ketrenos <[email protected]> 1127311810 -0500

Hardware crypto and fragmentation offload support added (Zhu Yi)

Signed-off-by: James Ketrenos <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>
  • Loading branch information
@jgarzik
James Ketrenos authored and jgarzik committed Sep 22, 2005
1 parent 20d6471 commit f1bf663
Show file tree
Hide file tree
Showing 3 changed files with 75 additions and 48 deletions.
46 changes: 25 additions & 21 deletions include/net/ieee80211.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -430,31 +430,34 @@ struct ieee80211_device;

#include "ieee80211_crypt.h"

#define SEC_KEY_1 (1<<0)
#define SEC_KEY_2 (1<<1)
#define SEC_KEY_3 (1<<2)
#define SEC_KEY_4 (1<<3)
#define SEC_KEY_MASK (SEC_KEY_1 | SEC_KEY_2 | SEC_KEY_3 | SEC_KEY_4)
#define SEC_ACTIVE_KEY (1<<4)
#define SEC_AUTH_MODE (1<<5)
#define SEC_UNICAST_GROUP (1<<6)
#define SEC_LEVEL (1<<7)
#define SEC_ENABLED (1<<8)

#define SEC_LEVEL_0 0 /* None */
#define SEC_LEVEL_1 1 /* WEP 40 and 104 bit */
#define SEC_LEVEL_2 2 /* Level 1 + TKIP */
#define SEC_LEVEL_2_CKIP 3 /* Level 1 + CKIP */
#define SEC_LEVEL_3 4 /* Level 2 + CCMP */

#define WEP_KEYS 4
#define WEP_KEY_LEN 13
#define SEC_KEY_1 (1<<0)
#define SEC_KEY_2 (1<<1)
#define SEC_KEY_3 (1<<2)
#define SEC_KEY_4 (1<<3)
#define SEC_ACTIVE_KEY (1<<4)
#define SEC_AUTH_MODE (1<<5)
#define SEC_UNICAST_GROUP (1<<6)
#define SEC_LEVEL (1<<7)
#define SEC_ENABLED (1<<8)
#define SEC_TGI_KEY_RESET (1<<9)

#define SEC_LEVEL_0 0 /* None */
#define SEC_LEVEL_1 1 /* WEP 40 and 104 bit */
#define SEC_LEVEL_2 2 /* Level 1 + TKIP */
#define SEC_LEVEL_2_CKIP 3 /* Level 1 + CKIP */
#define SEC_LEVEL_3 4 /* Level 2 + CCMP */

#define WEP_KEYS 4
#define WEP_KEY_LEN 13
#define SCM_KEY_LEN 32
#define SCM_TEMPORAL_KEY_LENGTH 16

struct ieee80211_security {
u16 active_key:2,
enabled:1, auth_mode:2, auth_algo:4, unicast_uses_group:1;
enabled:1,
auth_mode:2, auth_algo:4, unicast_uses_group:1, encrypt:1;
u8 key_sizes[WEP_KEYS];
u8 keys[WEP_KEYS][WEP_KEY_LEN];
u8 keys[WEP_KEYS][SCM_KEY_LEN];
u8 level;
u16 flags;
} __attribute__ ((packed));
Expand Down Expand Up @@ -636,6 +639,7 @@ enum ieee80211_state {

struct ieee80211_device {
struct net_device *dev;
struct ieee80211_security sec;

/* Bookkeeping structures */
struct net_device_stats stats;
Expand Down
27 changes: 21 additions & 6 deletions net/ieee80211/ieee80211_tx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -231,7 +231,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
unsigned long flags;
struct net_device_stats *stats = &ieee->stats;
int ether_type, encrypt;
int ether_type, encrypt, host_encrypt;
int bytes, fc, hdr_len;
struct sk_buff *skb_frag;
struct ieee80211_hdr header = { /* Ensure zero initialized */
Expand Down Expand Up @@ -262,7 +262,8 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
crypt = ieee->crypt[ieee->tx_keyidx];

encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
ieee->host_encrypt && crypt && crypt->ops;
ieee->sec.encrypt;
host_encrypt = ieee->host_encrypt && encrypt;

if (!encrypt && ieee->ieee802_1x &&
ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
Expand All @@ -280,7 +281,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
/* Determine total amount of storage required for TXB packets */
bytes = skb->len + SNAP_SIZE + sizeof(u16);

if (encrypt)
if (host_encrypt)
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
IEEE80211_FCTL_PROTECTED;
else
Expand Down Expand Up @@ -320,7 +321,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
bytes_per_frag -= IEEE80211_FCS_LEN;

/* Each fragment may need to have room for encryptiong pre/postfix */
if (encrypt)
if (host_encrypt)
bytes_per_frag -= crypt->ops->extra_prefix_len +
crypt->ops->extra_postfix_len;

Expand Down Expand Up @@ -348,7 +349,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
for (i = 0; i < nr_frags; i++) {
skb_frag = txb->fragments[i];

if (encrypt)
if (host_encrypt)
skb_reserve(skb_frag, crypt->ops->extra_prefix_len);

frag_hdr = (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len);
Expand Down Expand Up @@ -380,8 +381,22 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)

/* Encryption routine will move the header forward in order
* to insert the IV between the header and the payload */
if (encrypt)
if (host_encrypt)
ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len);

/* ipw2200/2915 Hardware encryption doesn't support TKIP MIC */
if (!ieee->host_encrypt && encrypt &&
(ieee->sec.level == SEC_LEVEL_2) &&
crypt && crypt->ops && crypt->ops->encrypt_msdu) {
int res = 0;
res = crypt->ops->encrypt_msdu(skb_frag, hdr_len,
crypt->priv);
if (res < 0) {
IEEE80211_ERROR("TKIP MIC encryption failed\n");
goto failed;
}
}

if (ieee->config &
(CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
skb_put(skb_frag, 4);
Expand Down
50 changes: 29 additions & 21 deletions net/ieee80211/ieee80211_wx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -278,6 +278,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
};
int i, key, key_provided, len;
struct ieee80211_crypt_data **crypt;
int host_crypto = ieee->host_encrypt || ieee->host_decrypt;

IEEE80211_DEBUG_WX("SET_ENCODE\n");

Expand Down Expand Up @@ -318,6 +319,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,

if (i == WEP_KEYS) {
sec.enabled = 0;
sec.encrypt = 0;
sec.level = SEC_LEVEL_0;
sec.flags |= SEC_ENABLED | SEC_LEVEL;
}
Expand All @@ -326,6 +328,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
}

sec.enabled = 1;
sec.encrypt = 1;
sec.flags |= SEC_ENABLED;

if (*crypt != NULL && (*crypt)->ops != NULL &&
Expand All @@ -335,7 +338,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
ieee80211_crypt_delayed_deinit(ieee, crypt);
}

if (*crypt == NULL) {
if (*crypt == NULL && host_crypto) {
struct ieee80211_crypt_data *new_crypt;

/* take WEP into use */
Expand Down Expand Up @@ -375,31 +378,34 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
key, escape_essid(sec.keys[key], len),
erq->length, len);
sec.key_sizes[key] = len;
(*crypt)->ops->set_key(sec.keys[key], len, NULL,
(*crypt)->priv);
if (*crypt)
(*crypt)->ops->set_key(sec.keys[key], len, NULL,
(*crypt)->priv);
sec.flags |= (1 << key);
/* This ensures a key will be activated if no key is
* explicitely set */
if (key == sec.active_key)
sec.flags |= SEC_ACTIVE_KEY;

} else {
len = (*crypt)->ops->get_key(sec.keys[key], WEP_KEY_LEN,
NULL, (*crypt)->priv);
if (len == 0) {
/* Set a default key of all 0 */
IEEE80211_DEBUG_WX("Setting key %d to all zero.\n",
key);
memset(sec.keys[key], 0, 13);
(*crypt)->ops->set_key(sec.keys[key], 13, NULL,
(*crypt)->priv);
sec.key_sizes[key] = 13;
sec.flags |= (1 << key);
if (host_crypto) {
len = (*crypt)->ops->get_key(sec.keys[key], WEP_KEY_LEN,
NULL, (*crypt)->priv);
if (len == 0) {
/* Set a default key of all 0 */
IEEE80211_DEBUG_WX("Setting key %d to all "
"zero.\n", key);
memset(sec.keys[key], 0, 13);
(*crypt)->ops->set_key(sec.keys[key], 13, NULL,
(*crypt)->priv);
sec.key_sizes[key] = 13;
sec.flags |= (1 << key);
}
}

/* No key data - just set the default TX key index */
if (key_provided) {
IEEE80211_DEBUG_WX
("Setting key %d to default Tx key.\n", key);
IEEE80211_DEBUG_WX("Setting key %d to default Tx "
"key.\n", key);
ieee->tx_keyidx = key;
sec.active_key = key;
sec.flags |= SEC_ACTIVE_KEY;
Expand Down Expand Up @@ -442,6 +448,7 @@ int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
struct iw_point *erq = &(wrqu->encoding);
int len, key;
struct ieee80211_crypt_data *crypt;
struct ieee80211_security *sec = &ieee->sec;

IEEE80211_DEBUG_WX("GET_ENCODE\n");

Expand All @@ -456,23 +463,24 @@ int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
crypt = ieee->crypt[key];
erq->flags = key + 1;

if (crypt == NULL || crypt->ops == NULL) {
if (!sec->enabled) {
erq->length = 0;
erq->flags |= IW_ENCODE_DISABLED;
return 0;
}

if (strcmp(crypt->ops->name, "WEP") != 0) {
if (sec->level != SEC_LEVEL_1) {
/* only WEP is supported with wireless extensions, so just
* report that encryption is used */
erq->length = 0;
erq->flags |= IW_ENCODE_ENABLED;
return 0;
}

len = crypt->ops->get_key(keybuf, WEP_KEY_LEN, NULL, crypt->priv);
erq->length = (len >= 0 ? len : 0);
len = sec->key_sizes[key];
memcpy(keybuf, sec->keys[key], len);

erq->length = (len >= 0 ? len : 0);
erq->flags |= IW_ENCODE_ENABLED;

if (ieee->open_wep)
Expand Down

0 comments on commit f1bf663

Please sign in to comment.