mirror of https://gitee.com/openkylin/linux.git
547 lines
16 KiB
C
547 lines
16 KiB
C
/******************************************************************************
|
|
|
|
Copyright(c) 2003 - 2005 Intel Corporation. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of version 2 of the GNU General Public License as
|
|
published by the Free Software Foundation.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program; if not, write to the Free Software Foundation, Inc., 59
|
|
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
The full GNU General Public License is included in this distribution in the
|
|
file called LICENSE.
|
|
|
|
Contact Information:
|
|
Intel Linux Wireless <ilw@linux.intel.com>
|
|
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
|
|
|
|
******************************************************************************/
|
|
#include <linux/compiler.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/in.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/types.h>
|
|
#include <linux/wireless.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "libipw.h"
|
|
|
|
/*
|
|
|
|
802.11 Data Frame
|
|
|
|
,-------------------------------------------------------------------.
|
|
Bytes | 2 | 2 | 6 | 6 | 6 | 2 | 0..2312 | 4 |
|
|
|------|------|---------|---------|---------|------|---------|------|
|
|
Desc. | ctrl | dura | DA/RA | TA | SA | Sequ | Frame | fcs |
|
|
| | tion | (BSSID) | | | ence | data | |
|
|
`--------------------------------------------------| |------'
|
|
Total: 28 non-data bytes `----.----'
|
|
|
|
|
.- 'Frame data' expands, if WEP enabled, to <----------'
|
|
|
|
|
V
|
|
,-----------------------.
|
|
Bytes | 4 | 0-2296 | 4 |
|
|
|-----|-----------|-----|
|
|
Desc. | IV | Encrypted | ICV |
|
|
| | Packet | |
|
|
`-----| |-----'
|
|
`-----.-----'
|
|
|
|
|
.- 'Encrypted Packet' expands to
|
|
|
|
|
V
|
|
,---------------------------------------------------.
|
|
Bytes | 1 | 1 | 1 | 3 | 2 | 0-2304 |
|
|
|------|------|---------|----------|------|---------|
|
|
Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP |
|
|
| DSAP | SSAP | | | | Packet |
|
|
| 0xAA | 0xAA |0x03 (UI)|0x00-00-F8| | |
|
|
`----------------------------------------------------
|
|
Total: 8 non-data bytes
|
|
|
|
802.3 Ethernet Data Frame
|
|
|
|
,-----------------------------------------.
|
|
Bytes | 6 | 6 | 2 | Variable | 4 |
|
|
|-------|-------|------|-----------|------|
|
|
Desc. | Dest. | Source| Type | IP Packet | fcs |
|
|
| MAC | MAC | | | |
|
|
`-----------------------------------------'
|
|
Total: 18 non-data bytes
|
|
|
|
In the event that fragmentation is required, the incoming payload is split into
|
|
N parts of size ieee->fts. The first fragment contains the SNAP header and the
|
|
remaining packets are just data.
|
|
|
|
If encryption is enabled, each fragment payload size is reduced by enough space
|
|
to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP)
|
|
So if you have 1500 bytes of payload with ieee->fts set to 500 without
|
|
encryption it will take 3 frames. With WEP it will take 4 frames as the
|
|
payload of each frame is reduced to 492 bytes.
|
|
|
|
* SKB visualization
|
|
*
|
|
* ,- skb->data
|
|
* |
|
|
* | ETHERNET HEADER ,-<-- PAYLOAD
|
|
* | | 14 bytes from skb->data
|
|
* | 2 bytes for Type --> ,T. | (sizeof ethhdr)
|
|
* | | | |
|
|
* |,-Dest.--. ,--Src.---. | | |
|
|
* | 6 bytes| | 6 bytes | | | |
|
|
* v | | | | | |
|
|
* 0 | v 1 | v | v 2
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
|
* ^ | ^ | ^ |
|
|
* | | | | | |
|
|
* | | | | `T' <---- 2 bytes for Type
|
|
* | | | |
|
|
* | | '---SNAP--' <-------- 6 bytes for SNAP
|
|
* | |
|
|
* `-IV--' <-------------------- 4 bytes for IV (WEP)
|
|
*
|
|
* SNAP HEADER
|
|
*
|
|
*/
|
|
|
|
static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
|
|
static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
|
|
|
|
static int libipw_copy_snap(u8 * data, __be16 h_proto)
|
|
{
|
|
struct libipw_snap_hdr *snap;
|
|
u8 *oui;
|
|
|
|
snap = (struct libipw_snap_hdr *)data;
|
|
snap->dsap = 0xaa;
|
|
snap->ssap = 0xaa;
|
|
snap->ctrl = 0x03;
|
|
|
|
if (h_proto == htons(ETH_P_AARP) || h_proto == htons(ETH_P_IPX))
|
|
oui = P802_1H_OUI;
|
|
else
|
|
oui = RFC1042_OUI;
|
|
snap->oui[0] = oui[0];
|
|
snap->oui[1] = oui[1];
|
|
snap->oui[2] = oui[2];
|
|
|
|
memcpy(data + SNAP_SIZE, &h_proto, sizeof(u16));
|
|
|
|
return SNAP_SIZE + sizeof(u16);
|
|
}
|
|
|
|
static int libipw_encrypt_fragment(struct libipw_device *ieee,
|
|
struct sk_buff *frag, int hdr_len)
|
|
{
|
|
struct lib80211_crypt_data *crypt =
|
|
ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
|
|
int res;
|
|
|
|
if (crypt == NULL)
|
|
return -1;
|
|
|
|
/* To encrypt, frame format is:
|
|
* IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */
|
|
atomic_inc(&crypt->refcnt);
|
|
res = 0;
|
|
if (crypt->ops && crypt->ops->encrypt_mpdu)
|
|
res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
|
|
|
|
atomic_dec(&crypt->refcnt);
|
|
if (res < 0) {
|
|
printk(KERN_INFO "%s: Encryption failed: len=%d.\n",
|
|
ieee->dev->name, frag->len);
|
|
ieee->ieee_stats.tx_discards++;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void libipw_txb_free(struct libipw_txb *txb)
|
|
{
|
|
int i;
|
|
if (unlikely(!txb))
|
|
return;
|
|
for (i = 0; i < txb->nr_frags; i++)
|
|
if (txb->fragments[i])
|
|
dev_kfree_skb_any(txb->fragments[i]);
|
|
kfree(txb);
|
|
}
|
|
|
|
static struct libipw_txb *libipw_alloc_txb(int nr_frags, int txb_size,
|
|
int headroom, gfp_t gfp_mask)
|
|
{
|
|
struct libipw_txb *txb;
|
|
int i;
|
|
txb = kmalloc(sizeof(struct libipw_txb) + (sizeof(u8 *) * nr_frags),
|
|
gfp_mask);
|
|
if (!txb)
|
|
return NULL;
|
|
|
|
memset(txb, 0, sizeof(struct libipw_txb));
|
|
txb->nr_frags = nr_frags;
|
|
txb->frag_size = txb_size;
|
|
|
|
for (i = 0; i < nr_frags; i++) {
|
|
txb->fragments[i] = __dev_alloc_skb(txb_size + headroom,
|
|
gfp_mask);
|
|
if (unlikely(!txb->fragments[i])) {
|
|
i--;
|
|
break;
|
|
}
|
|
skb_reserve(txb->fragments[i], headroom);
|
|
}
|
|
if (unlikely(i != nr_frags)) {
|
|
while (i >= 0)
|
|
dev_kfree_skb_any(txb->fragments[i--]);
|
|
kfree(txb);
|
|
return NULL;
|
|
}
|
|
return txb;
|
|
}
|
|
|
|
static int libipw_classify(struct sk_buff *skb)
|
|
{
|
|
struct ethhdr *eth;
|
|
struct iphdr *ip;
|
|
|
|
eth = (struct ethhdr *)skb->data;
|
|
if (eth->h_proto != htons(ETH_P_IP))
|
|
return 0;
|
|
|
|
ip = ip_hdr(skb);
|
|
switch (ip->tos & 0xfc) {
|
|
case 0x20:
|
|
return 2;
|
|
case 0x40:
|
|
return 1;
|
|
case 0x60:
|
|
return 3;
|
|
case 0x80:
|
|
return 4;
|
|
case 0xa0:
|
|
return 5;
|
|
case 0xc0:
|
|
return 6;
|
|
case 0xe0:
|
|
return 7;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Incoming skb is converted to a txb which consists of
|
|
* a block of 802.11 fragment packets (stored as skbs) */
|
|
netdev_tx_t libipw_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct libipw_device *ieee = netdev_priv(dev);
|
|
struct libipw_txb *txb = NULL;
|
|
struct libipw_hdr_3addrqos *frag_hdr;
|
|
int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size,
|
|
rts_required;
|
|
unsigned long flags;
|
|
int encrypt, host_encrypt, host_encrypt_msdu, host_build_iv;
|
|
__be16 ether_type;
|
|
int bytes, fc, hdr_len;
|
|
struct sk_buff *skb_frag;
|
|
struct libipw_hdr_3addrqos header = {/* Ensure zero initialized */
|
|
.duration_id = 0,
|
|
.seq_ctl = 0,
|
|
.qos_ctl = 0
|
|
};
|
|
u8 dest[ETH_ALEN], src[ETH_ALEN];
|
|
struct lib80211_crypt_data *crypt;
|
|
int priority = skb->priority;
|
|
int snapped = 0;
|
|
|
|
if (ieee->is_queue_full && (*ieee->is_queue_full) (dev, priority))
|
|
return NETDEV_TX_BUSY;
|
|
|
|
spin_lock_irqsave(&ieee->lock, flags);
|
|
|
|
/* If there is no driver handler to take the TXB, dont' bother
|
|
* creating it... */
|
|
if (!ieee->hard_start_xmit) {
|
|
printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name);
|
|
goto success;
|
|
}
|
|
|
|
if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
|
|
printk(KERN_WARNING "%s: skb too small (%d).\n",
|
|
ieee->dev->name, skb->len);
|
|
goto success;
|
|
}
|
|
|
|
ether_type = ((struct ethhdr *)skb->data)->h_proto;
|
|
|
|
crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
|
|
|
|
encrypt = !(ether_type == htons(ETH_P_PAE) && ieee->ieee802_1x) &&
|
|
ieee->sec.encrypt;
|
|
|
|
host_encrypt = ieee->host_encrypt && encrypt && crypt;
|
|
host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt && crypt;
|
|
host_build_iv = ieee->host_build_iv && encrypt && crypt;
|
|
|
|
if (!encrypt && ieee->ieee802_1x &&
|
|
ieee->drop_unencrypted && ether_type != htons(ETH_P_PAE)) {
|
|
dev->stats.tx_dropped++;
|
|
goto success;
|
|
}
|
|
|
|
/* Save source and destination addresses */
|
|
skb_copy_from_linear_data(skb, dest, ETH_ALEN);
|
|
skb_copy_from_linear_data_offset(skb, ETH_ALEN, src, ETH_ALEN);
|
|
|
|
if (host_encrypt || host_build_iv)
|
|
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
|
|
IEEE80211_FCTL_PROTECTED;
|
|
else
|
|
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
|
|
|
|
if (ieee->iw_mode == IW_MODE_INFRA) {
|
|
fc |= IEEE80211_FCTL_TODS;
|
|
/* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
|
|
memcpy(header.addr1, ieee->bssid, ETH_ALEN);
|
|
memcpy(header.addr2, src, ETH_ALEN);
|
|
memcpy(header.addr3, dest, ETH_ALEN);
|
|
} else if (ieee->iw_mode == IW_MODE_ADHOC) {
|
|
/* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
|
|
memcpy(header.addr1, dest, ETH_ALEN);
|
|
memcpy(header.addr2, src, ETH_ALEN);
|
|
memcpy(header.addr3, ieee->bssid, ETH_ALEN);
|
|
}
|
|
hdr_len = LIBIPW_3ADDR_LEN;
|
|
|
|
if (ieee->is_qos_active && ieee->is_qos_active(dev, skb)) {
|
|
fc |= IEEE80211_STYPE_QOS_DATA;
|
|
hdr_len += 2;
|
|
|
|
skb->priority = libipw_classify(skb);
|
|
header.qos_ctl |= cpu_to_le16(skb->priority & LIBIPW_QCTL_TID);
|
|
}
|
|
header.frame_ctl = cpu_to_le16(fc);
|
|
|
|
/* Advance the SKB to the start of the payload */
|
|
skb_pull(skb, sizeof(struct ethhdr));
|
|
|
|
/* Determine total amount of storage required for TXB packets */
|
|
bytes = skb->len + SNAP_SIZE + sizeof(u16);
|
|
|
|
/* Encrypt msdu first on the whole data packet. */
|
|
if ((host_encrypt || host_encrypt_msdu) &&
|
|
crypt && crypt->ops && crypt->ops->encrypt_msdu) {
|
|
int res = 0;
|
|
int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len +
|
|
crypt->ops->extra_msdu_postfix_len;
|
|
struct sk_buff *skb_new = dev_alloc_skb(len);
|
|
|
|
if (unlikely(!skb_new))
|
|
goto failed;
|
|
|
|
skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len);
|
|
memcpy(skb_put(skb_new, hdr_len), &header, hdr_len);
|
|
snapped = 1;
|
|
libipw_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)),
|
|
ether_type);
|
|
skb_copy_from_linear_data(skb, skb_put(skb_new, skb->len), skb->len);
|
|
res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv);
|
|
if (res < 0) {
|
|
LIBIPW_ERROR("msdu encryption failed\n");
|
|
dev_kfree_skb_any(skb_new);
|
|
goto failed;
|
|
}
|
|
dev_kfree_skb_any(skb);
|
|
skb = skb_new;
|
|
bytes += crypt->ops->extra_msdu_prefix_len +
|
|
crypt->ops->extra_msdu_postfix_len;
|
|
skb_pull(skb, hdr_len);
|
|
}
|
|
|
|
if (host_encrypt || ieee->host_open_frag) {
|
|
/* Determine fragmentation size based on destination (multicast
|
|
* and broadcast are not fragmented) */
|
|
if (is_multicast_ether_addr(dest) ||
|
|
is_broadcast_ether_addr(dest))
|
|
frag_size = MAX_FRAG_THRESHOLD;
|
|
else
|
|
frag_size = ieee->fts;
|
|
|
|
/* Determine amount of payload per fragment. Regardless of if
|
|
* this stack is providing the full 802.11 header, one will
|
|
* eventually be affixed to this fragment -- so we must account
|
|
* for it when determining the amount of payload space. */
|
|
bytes_per_frag = frag_size - hdr_len;
|
|
if (ieee->config &
|
|
(CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
|
|
bytes_per_frag -= LIBIPW_FCS_LEN;
|
|
|
|
/* Each fragment may need to have room for encryptiong
|
|
* pre/postfix */
|
|
if (host_encrypt)
|
|
bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
|
|
crypt->ops->extra_mpdu_postfix_len;
|
|
|
|
/* Number of fragments is the total
|
|
* bytes_per_frag / payload_per_fragment */
|
|
nr_frags = bytes / bytes_per_frag;
|
|
bytes_last_frag = bytes % bytes_per_frag;
|
|
if (bytes_last_frag)
|
|
nr_frags++;
|
|
else
|
|
bytes_last_frag = bytes_per_frag;
|
|
} else {
|
|
nr_frags = 1;
|
|
bytes_per_frag = bytes_last_frag = bytes;
|
|
frag_size = bytes + hdr_len;
|
|
}
|
|
|
|
rts_required = (frag_size > ieee->rts
|
|
&& ieee->config & CFG_LIBIPW_RTS);
|
|
if (rts_required)
|
|
nr_frags++;
|
|
|
|
/* When we allocate the TXB we allocate enough space for the reserve
|
|
* and full fragment bytes (bytes_per_frag doesn't include prefix,
|
|
* postfix, header, FCS, etc.) */
|
|
txb = libipw_alloc_txb(nr_frags, frag_size,
|
|
ieee->tx_headroom, GFP_ATOMIC);
|
|
if (unlikely(!txb)) {
|
|
printk(KERN_WARNING "%s: Could not allocate TXB\n",
|
|
ieee->dev->name);
|
|
goto failed;
|
|
}
|
|
txb->encrypted = encrypt;
|
|
if (host_encrypt)
|
|
txb->payload_size = frag_size * (nr_frags - 1) +
|
|
bytes_last_frag;
|
|
else
|
|
txb->payload_size = bytes;
|
|
|
|
if (rts_required) {
|
|
skb_frag = txb->fragments[0];
|
|
frag_hdr =
|
|
(struct libipw_hdr_3addrqos *)skb_put(skb_frag, hdr_len);
|
|
|
|
/*
|
|
* Set header frame_ctl to the RTS.
|
|
*/
|
|
header.frame_ctl =
|
|
cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
|
|
memcpy(frag_hdr, &header, hdr_len);
|
|
|
|
/*
|
|
* Restore header frame_ctl to the original data setting.
|
|
*/
|
|
header.frame_ctl = cpu_to_le16(fc);
|
|
|
|
if (ieee->config &
|
|
(CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
|
|
skb_put(skb_frag, 4);
|
|
|
|
txb->rts_included = 1;
|
|
i = 1;
|
|
} else
|
|
i = 0;
|
|
|
|
for (; i < nr_frags; i++) {
|
|
skb_frag = txb->fragments[i];
|
|
|
|
if (host_encrypt || host_build_iv)
|
|
skb_reserve(skb_frag,
|
|
crypt->ops->extra_mpdu_prefix_len);
|
|
|
|
frag_hdr =
|
|
(struct libipw_hdr_3addrqos *)skb_put(skb_frag, hdr_len);
|
|
memcpy(frag_hdr, &header, hdr_len);
|
|
|
|
/* If this is not the last fragment, then add the MOREFRAGS
|
|
* bit to the frame control */
|
|
if (i != nr_frags - 1) {
|
|
frag_hdr->frame_ctl =
|
|
cpu_to_le16(fc | IEEE80211_FCTL_MOREFRAGS);
|
|
bytes = bytes_per_frag;
|
|
} else {
|
|
/* The last fragment takes the remaining length */
|
|
bytes = bytes_last_frag;
|
|
}
|
|
|
|
if (i == 0 && !snapped) {
|
|
libipw_copy_snap(skb_put
|
|
(skb_frag, SNAP_SIZE + sizeof(u16)),
|
|
ether_type);
|
|
bytes -= SNAP_SIZE + sizeof(u16);
|
|
}
|
|
|
|
skb_copy_from_linear_data(skb, skb_put(skb_frag, bytes), bytes);
|
|
|
|
/* Advance the SKB... */
|
|
skb_pull(skb, bytes);
|
|
|
|
/* Encryption routine will move the header forward in order
|
|
* to insert the IV between the header and the payload */
|
|
if (host_encrypt)
|
|
libipw_encrypt_fragment(ieee, skb_frag, hdr_len);
|
|
else if (host_build_iv) {
|
|
atomic_inc(&crypt->refcnt);
|
|
if (crypt->ops->build_iv)
|
|
crypt->ops->build_iv(skb_frag, hdr_len,
|
|
ieee->sec.keys[ieee->sec.active_key],
|
|
ieee->sec.key_sizes[ieee->sec.active_key],
|
|
crypt->priv);
|
|
atomic_dec(&crypt->refcnt);
|
|
}
|
|
|
|
if (ieee->config &
|
|
(CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS))
|
|
skb_put(skb_frag, 4);
|
|
}
|
|
|
|
success:
|
|
spin_unlock_irqrestore(&ieee->lock, flags);
|
|
|
|
dev_kfree_skb_any(skb);
|
|
|
|
if (txb) {
|
|
netdev_tx_t ret = (*ieee->hard_start_xmit)(txb, dev, priority);
|
|
if (ret == NETDEV_TX_OK) {
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += txb->payload_size;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
libipw_txb_free(txb);
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
failed:
|
|
spin_unlock_irqrestore(&ieee->lock, flags);
|
|
netif_stop_queue(dev);
|
|
dev->stats.tx_errors++;
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
EXPORT_SYMBOL(libipw_xmit);
|
|
|
|
EXPORT_SYMBOL(libipw_txb_free);
|