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orinoco: Add MIC on TX and check on RX 

Use the MIC algorithm from the crypto subsystem.

Signed-off-by: David Kilroy <kilroyd@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
David Kilroy 2008-08-21 23:28:05 +01:00 committed by John W. Linville
parent 31afcef385
commit 23edcc4147
4 changed files with 229 additions and 16 deletions
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2
drivers/net/wireless/Kconfig
View File

@ -336,6 +336,8 @@ config HERMES
depends on (PPC_PMAC || PCI || PCMCIA) && WLAN_80211
select WIRELESS_EXT
select FW_LOADER
select CRYPTO
select CRYPTO_MICHAEL_MIC
---help---
A driver for 802.11b wireless cards based on the "Hermes" or
Intersil HFA384x (Prism 2) MAC controller. This includes the vast

7
drivers/net/wireless/hermes.h
View File

@ -184,13 +184,18 @@
#define HERMES_RXSTAT_ERR (0x0003)
#define HERMES_RXSTAT_BADCRC (0x0001)
#define HERMES_RXSTAT_UNDECRYPTABLE (0x0002)
#define HERMES_RXSTAT_MIC (0x0010) /* Frame contains MIC */
#define HERMES_RXSTAT_MACPORT (0x0700)
#define HERMES_RXSTAT_PCF (0x1000) /* Frame was received in CF period */
#define HERMES_RXSTAT_MIC_KEY_ID (0x1800) /* MIC key used */
#define HERMES_RXSTAT_MSGTYPE (0xE000)
#define HERMES_RXSTAT_1042 (0x2000) /* RFC-1042 frame */
#define HERMES_RXSTAT_TUNNEL (0x4000) /* bridge-tunnel encoded frame */
#define HERMES_RXSTAT_WMP (0x6000) /* Wavelan-II Management Protocol frame */
/* Shift amount for key ID in RXSTAT and TXCTRL */
#define HERMES_MIC_KEY_ID_SHIFT 11
struct hermes_tx_descriptor {
__le16 status;
__le16 reserved1;
@ -209,6 +214,8 @@ struct hermes_tx_descriptor {
#define HERMES_TXCTRL_TX_OK (0x0002) /* ?? interrupt on Tx complete */
#define HERMES_TXCTRL_TX_EX (0x0004) /* ?? interrupt on Tx exception */
#define HERMES_TXCTRL_802_11 (0x0008) /* We supply 802.11 header */
#define HERMES_TXCTRL_MIC (0x0010) /* 802.3 + TKIP */
#define HERMES_TXCTRL_MIC_KEY_ID (0x1800) /* MIC Key ID mask */
#define HERMES_TXCTRL_ALT_RTRY (0x0020)
/* Inquiry constants and data types */

234
drivers/net/wireless/orinoco.c
View File

@ -89,6 +89,9 @@
#include <net/iw_handler.h>
#include <net/ieee80211.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include "hermes_rid.h"
#include "hermes_dld.h"
#include "orinoco.h"
@ -243,6 +246,74 @@ struct hermes_rx_descriptor {
static int __orinoco_program_rids(struct net_device *dev);
static void __orinoco_set_multicast_list(struct net_device *dev);
/********************************************************************/
/* Michael MIC crypto setup */
/********************************************************************/
#define MICHAEL_MIC_LEN 8
static int orinoco_mic_init(struct orinoco_private *priv)
{
priv->tx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0);
if (IS_ERR(priv->tx_tfm_mic)) {
printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
"crypto API michael_mic\n");
priv->tx_tfm_mic = NULL;
return -ENOMEM;
}
priv->rx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0);
if (IS_ERR(priv->rx_tfm_mic)) {
printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
"crypto API michael_mic\n");
priv->rx_tfm_mic = NULL;
return -ENOMEM;
}
return 0;
}
static void orinoco_mic_free(struct orinoco_private *priv)
{
if (priv->tx_tfm_mic)
crypto_free_hash(priv->tx_tfm_mic);
if (priv->rx_tfm_mic)
crypto_free_hash(priv->rx_tfm_mic);
}
static int michael_mic(struct crypto_hash *tfm_michael, u8 *key,
u8 *da, u8 *sa, u8 priority,
u8 *data, size_t data_len, u8 *mic)
{
struct hash_desc desc;
struct scatterlist sg[2];
u8 hdr[ETH_HLEN + 2]; /* size of header + padding */
if (tfm_michael == NULL) {
printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n");
return -1;
}
/* Copy header into buffer. We need the padding on the end zeroed */
memcpy(&hdr[0], da, ETH_ALEN);
memcpy(&hdr[ETH_ALEN], sa, ETH_ALEN);
hdr[ETH_ALEN*2] = priority;
hdr[ETH_ALEN*2+1] = 0;
hdr[ETH_ALEN*2+2] = 0;
hdr[ETH_ALEN*2+3] = 0;
/* Use scatter gather to MIC header and data in one go */
sg_init_table(sg, 2);
sg_set_buf(&sg[0], hdr, sizeof(hdr));
sg_set_buf(&sg[1], data, data_len);
if (crypto_hash_setkey(tfm_michael, key, MIC_KEYLEN))
return -1;
desc.tfm = tfm_michael;
desc.flags = 0;
return crypto_hash_digest(&desc, sg, data_len + sizeof(hdr),
mic);
}
/********************************************************************/
/* Internal helper functions */
/********************************************************************/
@ -764,7 +835,6 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
int err = 0;
u16 txfid = priv->txfid;
struct ethhdr *eh;
int data_off;
int tx_control;
unsigned long flags;
@ -797,10 +867,12 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
if (skb->len < ETH_HLEN)
goto drop;
eh = (struct ethhdr *)skb->data;
tx_control = HERMES_TXCTRL_TX_OK | HERMES_TXCTRL_TX_EX;
if (priv->encode_alg == IW_ENCODE_ALG_TKIP)
tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) |
HERMES_TXCTRL_MIC;
if (priv->has_alt_txcntl) {
/* WPA enabled firmwares have tx_cntl at the end of
* the 802.11 header. So write zeroed descriptor and
@ -842,6 +914,8 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
HERMES_802_3_OFFSET - HERMES_802_11_OFFSET);
}
eh = (struct ethhdr *)skb->data;
/* Encapsulate Ethernet-II frames */
if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
struct header_struct {
@ -851,33 +925,65 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
/* Strip destination and source from the data */
skb_pull(skb, 2 * ETH_ALEN);
data_off = HERMES_802_2_OFFSET + sizeof(encaps_hdr);
/* And move them to a separate header */
memcpy(&hdr.eth, eh, 2 * ETH_ALEN);
hdr.eth.h_proto = htons(sizeof(encaps_hdr) + skb->len);
memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr));
err = hermes_bap_pwrite(hw, USER_BAP, &hdr, sizeof(hdr),
txfid, HERMES_802_3_OFFSET);
if (err) {
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d writing packet "
"header to BAP\n", dev->name, err);
goto busy;
/* Insert the SNAP header */
if (skb_headroom(skb) < sizeof(hdr)) {
printk(KERN_ERR
"%s: Not enough headroom for 802.2 headers %d\n",
dev->name, skb_headroom(skb));
goto drop;
}
} else { /* IEEE 802.3 frame */
data_off = HERMES_802_3_OFFSET;
eh = (struct ethhdr *) skb_push(skb, sizeof(hdr));
memcpy(eh, &hdr, sizeof(hdr));
}
err = hermes_bap_pwrite(hw, USER_BAP, skb->data, skb->len,
txfid, data_off);
txfid, HERMES_802_3_OFFSET);
if (err) {
printk(KERN_ERR "%s: Error %d writing packet to BAP\n",
dev->name, err);
goto busy;
}
/* Calculate Michael MIC */
if (priv->encode_alg == IW_ENCODE_ALG_TKIP) {
u8 mic_buf[MICHAEL_MIC_LEN + 1];
u8 *mic;
size_t offset;
size_t len;
if (skb->len % 2) {
/* MIC start is on an odd boundary */
mic_buf[0] = skb->data[skb->len - 1];
mic = &mic_buf[1];
offset = skb->len - 1;
len = MICHAEL_MIC_LEN + 1;
} else {
mic = &mic_buf[0];
offset = skb->len;
len = MICHAEL_MIC_LEN;
}
michael_mic(priv->tx_tfm_mic,
priv->tkip_key[priv->tx_key].tx_mic,
eh->h_dest, eh->h_source, 0 /* priority */,
skb->data + ETH_HLEN, skb->len - ETH_HLEN, mic);
/* Write the MIC */
err = hermes_bap_pwrite(hw, USER_BAP, &mic_buf[0], len,
txfid, HERMES_802_3_OFFSET + offset);
if (err) {
printk(KERN_ERR "%s: Error %d writing MIC to BAP\n",
dev->name, err);
goto busy;
}
}
/* Finally, we actually initiate the send */
netif_stop_queue(dev);
@ -892,7 +998,7 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
}
dev->trans_start = jiffies;
stats->tx_bytes += data_off + skb->len;
stats->tx_bytes += HERMES_802_3_OFFSET + skb->len;
goto ok;
drop:
@ -1172,6 +1278,25 @@ static void orinoco_rx_monitor(struct net_device *dev, u16 rxfid,
stats->rx_dropped++;
}
/* Get tsc from the firmware */
static int orinoco_hw_get_tkip_iv(struct orinoco_private *priv, int key,
u8 *tsc)
{
hermes_t *hw = &priv->hw;
int err = 0;
u8 tsc_arr[4][IW_ENCODE_SEQ_MAX_SIZE];
if ((key < 0) || (key > 4))
return -EINVAL;
err = hermes_read_ltv(hw, USER_BAP, HERMES_RID_CURRENT_TKIP_IV,
sizeof(tsc_arr), NULL, &tsc_arr);
if (!err)
memcpy(tsc, &tsc_arr[key][0], sizeof(tsc_arr[0]));
return err;
}
static void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw)
{
struct orinoco_private *priv = netdev_priv(dev);
@ -1240,6 +1365,11 @@ static void __orinoco_ev_rx(struct net_device *dev, hermes_t *hw)
goto update_stats;
}
/* Payload size does not include Michael MIC. Increase payload
* size to read it together with the data. */
if (status & HERMES_RXSTAT_MIC)
length += MICHAEL_MIC_LEN;
/* We need space for the packet data itself, plus an ethernet
header, plus 2 bytes so we can align the IP header on a
32bit boundary, plus 1 byte so we can read in odd length
@ -1303,6 +1433,63 @@ static void orinoco_rx(struct net_device *dev,
length = le16_to_cpu(desc->data_len);
fc = le16_to_cpu(desc->frame_ctl);
/* Calculate and check MIC */
if (status & HERMES_RXSTAT_MIC) {
int key_id = ((status & HERMES_RXSTAT_MIC_KEY_ID) >>
HERMES_MIC_KEY_ID_SHIFT);
u8 mic[MICHAEL_MIC_LEN];
u8 *rxmic;
u8 *src = (fc & IEEE80211_FCTL_FROMDS) ?
desc->addr3 : desc->addr2;
/* Extract Michael MIC from payload */
rxmic = skb->data + skb->len - MICHAEL_MIC_LEN;
skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
length -= MICHAEL_MIC_LEN;
michael_mic(priv->rx_tfm_mic,
priv->tkip_key[key_id].rx_mic,
desc->addr1,
src,
0, /* priority or QoS? */
skb->data,
skb->len,
&mic[0]);
if (memcmp(mic, rxmic,
MICHAEL_MIC_LEN)) {
union iwreq_data wrqu;
struct iw_michaelmicfailure wxmic;
DECLARE_MAC_BUF(mac);
printk(KERN_WARNING "%s: "
"Invalid Michael MIC in data frame from %s, "
"using key %i\n",
dev->name, print_mac(mac, src), key_id);
/* TODO: update stats */
/* Notify userspace */
memset(&wxmic, 0, sizeof(wxmic));
wxmic.flags = key_id & IW_MICFAILURE_KEY_ID;
wxmic.flags |= (desc->addr1[0] & 1) ?
IW_MICFAILURE_GROUP : IW_MICFAILURE_PAIRWISE;
wxmic.src_addr.sa_family = ARPHRD_ETHER;
memcpy(wxmic.src_addr.sa_data, src, ETH_ALEN);
(void) orinoco_hw_get_tkip_iv(priv, key_id,
&wxmic.tsc[0]);
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = sizeof(wxmic);
wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu,
(char *) &wxmic);
goto drop;
}
}
/* Handle decapsulation
* In most cases, the firmware tell us about SNAP frames.
* For some reason, the SNAP frames sent by LinkSys APs
@ -1342,6 +1529,11 @@ static void orinoco_rx(struct net_device *dev,
stats->rx_bytes += length;
return;
drop:
dev_kfree_skb(skb);
stats->rx_errors++;
stats->rx_dropped++;
}
static void orinoco_rx_isr_tasklet(unsigned long data)
@ -3112,8 +3304,14 @@ static int orinoco_init(struct net_device *dev)
else
printk("40-bit key\n");
}
if (priv->has_wpa)
if (priv->has_wpa) {
printk(KERN_DEBUG "%s: WPA-PSK supported\n", dev->name);
if (orinoco_mic_init(priv)) {
printk(KERN_ERR "%s: Failed to setup MIC crypto "
"algorithm. Disabling WPA support\n", dev->name);
priv->has_wpa = 0;
}
}
/* Now we have the firmware capabilities, allocate appropiate
* sized scan buffers */
@ -3292,6 +3490,9 @@ struct net_device
dev->set_multicast_list = orinoco_set_multicast_list;
/* we use the default eth_mac_addr for setting the MAC addr */
/* Reserve space in skb for the SNAP header */
dev->hard_header_len += ENCAPS_OVERHEAD;
/* Set up default callbacks */
dev->open = orinoco_open;
dev->stop = orinoco_stop;
@ -3327,6 +3528,7 @@ void free_orinocodev(struct net_device *dev)
tasklet_kill(&priv->rx_tasklet);
priv->wpa_ie_len = 0;
kfree(priv->wpa_ie);
orinoco_mic_free(priv);
orinoco_bss_data_free(priv);
free_netdev(dev);
}

2
drivers/net/wireless/orinoco.h
View File

@ -158,6 +158,8 @@ struct orinoco_private {
int wpa_ie_len;
struct orinoco_tkip_key tkip_key[ORINOCO_MAX_KEYS];
struct crypto_hash *rx_tfm_mic;
struct crypto_hash *tx_tfm_mic;
unsigned int wpa_enabled:1;
unsigned int tkip_cm_active:1;