+++ /dev/null
-/******************************************************************************
-
- 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;
- __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;
-
- 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)
- 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 encryption
- * 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)
- 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);
-
- 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);
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