/******************************************************************************
- Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.
+ 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
******************************************************************************/
#include <linux/compiler.h>
-#include <linux/config.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
-#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
-#include <linux/version.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>
#include <net/ieee80211.h>
-
/*
-
802.11 Data Frame
,-------------------------------------------------------------------.
| | tion | (BSSID) | | | ence | data | |
`--------------------------------------------------| |------'
Total: 28 non-data bytes `----.----'
- |
- .- 'Frame data' expands to <---------------------------'
+ |
+ .- 'Frame data' expands, if WEP enabled, to <----------'
+ |
+ V
+ ,-----------------------.
+Bytes | 4 | 0-2296 | 4 |
+ |-----|-----------|-----|
+Desc. | IV | Encrypted | ICV |
+ | | Packet | |
+ `-----| |-----'
+ `-----.-----'
+ |
+ .- 'Encrypted Packet' expands to
|
V
,---------------------------------------------------.
Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP |
| DSAP | SSAP | | | | Packet |
| 0xAA | 0xAA |0x03 (UI)|0x00-00-F8| | |
- `-----------------------------------------| |
-Total: 8 non-data bytes `----.----'
- |
- .- 'IP Packet' expands, if WEP enabled, to <--'
- |
- V
- ,-----------------------.
-Bytes | 4 | 0-2296 | 4 |
- |-----|-----------|-----|
-Desc. | IV | Encrypted | ICV |
- | | IP Packet | |
- `-----------------------'
+ `----------------------------------------------------
Total: 8 non-data bytes
-
802.3 Ethernet Data Frame
,-----------------------------------------.
static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
-static inline int ieee80211_put_snap(u8 *data, u16 h_proto)
+static int ieee80211_copy_snap(u8 * data, __be16 h_proto)
{
struct ieee80211_snap_hdr *snap;
u8 *oui;
snap->ssap = 0xaa;
snap->ctrl = 0x03;
- if (h_proto == 0x8137 || h_proto == 0x80f3)
+ if (h_proto == htons(ETH_P_AARP) || h_proto == htons(ETH_P_IPX))
oui = P802_1H_OUI;
else
oui = RFC1042_OUI;
snap->oui[1] = oui[1];
snap->oui[2] = oui[2];
- *(u16 *)(data + SNAP_SIZE) = htons(h_proto);
+ memcpy(data + SNAP_SIZE, &h_proto, sizeof(u16));
return SNAP_SIZE + sizeof(u16);
}
-static inline int ieee80211_encrypt_fragment(
- struct ieee80211_device *ieee,
- struct sk_buff *frag,
- int hdr_len)
+static int ieee80211_encrypt_fragment(struct ieee80211_device *ieee,
+ struct sk_buff *frag, int hdr_len)
{
- struct ieee80211_crypt_data* crypt = ieee->crypt[ieee->tx_keyidx];
+ struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx];
int res;
-#ifdef CONFIG_IEEE80211_CRYPT_TKIP
- struct ieee80211_hdr *header;
-
- if (ieee->tkip_countermeasures &&
- crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) {
- header = (struct ieee80211_hdr *) frag->data;
- if (net_ratelimit()) {
- printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
- "TX packet to " MAC_FMT "\n",
- ieee->dev->name, MAC_ARG(header->addr1));
- }
+ if (crypt == NULL)
return -1;
- }
-#endif
+
/* To encrypt, frame format is:
* IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */
-
- // PR: FIXME: Copied from hostap. Check fragmentation/MSDU/MPDU encryption.
- /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
- * call both MSDU and MPDU encryption functions from here. */
atomic_inc(&crypt->refcnt);
res = 0;
- if (crypt->ops->encrypt_msdu)
- res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
- if (res == 0 && crypt->ops->encrypt_mpdu)
+ if (crypt->ops && crypt->ops->encrypt_mpdu)
res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
atomic_dec(&crypt->refcnt);
return 0;
}
-
-void ieee80211_txb_free(struct ieee80211_txb *txb) {
+void ieee80211_txb_free(struct ieee80211_txb *txb)
+{
int i;
if (unlikely(!txb))
return;
kfree(txb);
}
-struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
- int gfp_mask)
+static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
+ int headroom, gfp_t gfp_mask)
{
struct ieee80211_txb *txb;
int i;
- txb = kmalloc(
- sizeof(struct ieee80211_txb) + (sizeof(u8*) * nr_frags),
- gfp_mask);
+ txb = kmalloc(sizeof(struct ieee80211_txb) + (sizeof(u8 *) * nr_frags),
+ gfp_mask);
if (!txb)
return NULL;
- memset(txb, sizeof(struct ieee80211_txb), 0);
+ memset(txb, 0, sizeof(struct ieee80211_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);
+ 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)
return txb;
}
-/* SKBs are added to the ieee->tx_queue. */
-int ieee80211_xmit(struct sk_buff *skb,
- struct net_device *dev)
+static int ieee80211_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) */
+int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ieee80211_device *ieee = netdev_priv(dev);
struct ieee80211_txb *txb = NULL;
- struct ieee80211_hdr *frag_hdr;
- int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
+ struct ieee80211_hdr_3addrqos *frag_hdr;
+ int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size,
+ rts_required;
unsigned long flags;
struct net_device_stats *stats = &ieee->stats;
- int ether_type, encrypt;
+ int encrypt, host_encrypt, host_encrypt_msdu, host_build_iv;
+ __be16 ether_type;
int bytes, fc, hdr_len;
struct sk_buff *skb_frag;
- struct ieee80211_hdr header = { /* Ensure zero initialized */
+ struct ieee80211_hdr_3addrqos header = {/* Ensure zero initialized */
.duration_id = 0,
- .seq_ctl = 0
+ .seq_ctl = 0,
+ .qos_ctl = 0
};
u8 dest[ETH_ALEN], src[ETH_ALEN];
+ struct ieee80211_crypt_data *crypt;
+ int priority = skb->priority;
+ int snapped = 0;
- struct ieee80211_crypt_data* crypt;
+ 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);
+ printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name);
goto success;
}
goto success;
}
- ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
+ ether_type = ((struct ethhdr *)skb->data)->h_proto;
crypt = ieee->crypt[ieee->tx_keyidx];
- encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
- ieee->host_encrypt && crypt && crypt->ops;
+ 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 != ETH_P_PAE) {
+ ieee->drop_unencrypted && ether_type != htons(ETH_P_PAE)) {
stats->tx_dropped++;
goto success;
}
-#ifdef CONFIG_IEEE80211_DEBUG
- if (crypt && !encrypt && ether_type == ETH_P_PAE) {
- struct eapol *eap = (struct eapol *)(skb->data +
- sizeof(struct ethhdr) - SNAP_SIZE - sizeof(u16));
- IEEE80211_DEBUG_EAP("TX: IEEE 802.11 EAPOL frame: %s\n",
- eap_get_type(eap->type));
- }
-#endif
-
/* Save source and destination addresses */
- memcpy(&dest, skb->data, ETH_ALEN);
- memcpy(&src, skb->data+ETH_ALEN, ETH_ALEN);
-
- /* 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);
+ skb_copy_from_linear_data(skb, dest, ETH_ALEN);
+ skb_copy_from_linear_data_offset(skb, ETH_ALEN, src, ETH_ALEN);
- if (encrypt)
+ if (host_encrypt || host_build_iv)
fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
- IEEE80211_FCTL_WEP;
+ 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);
+ /* 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);
+ /* 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);
}
- header.frame_ctl = cpu_to_le16(fc);
hdr_len = IEEE80211_3ADDR_LEN;
- /* 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 - IEEE80211_3ADDR_LEN;
- if (ieee->config &
- (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
- bytes_per_frag -= IEEE80211_FCS_LEN;
-
- /* Each fragment may need to have room for encryptiong pre/postfix */
- if (encrypt)
- bytes_per_frag -= crypt->ops->extra_prefix_len +
- crypt->ops->extra_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)
+ if (ieee->is_qos_active && ieee->is_qos_active(dev, skb)) {
+ fc |= IEEE80211_STYPE_QOS_DATA;
+ hdr_len += 2;
+
+ skb->priority = ieee80211_classify(skb);
+ header.qos_ctl |= cpu_to_le16(skb->priority & IEEE80211_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;
+ ieee80211_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) {
+ IEEE80211_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_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
+ bytes_per_frag -= IEEE80211_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_IEEE80211_RTS);
+ if (rts_required)
nr_frags++;
- else
- bytes_last_frag = bytes_per_frag;
/* 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 = ieee80211_alloc_txb(nr_frags, frag_size, GFP_ATOMIC);
+ txb = ieee80211_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;
- txb->payload_size = bytes;
+ 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 ieee80211_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);
- for (i = 0; i < nr_frags; i++) {
+ /*
+ * Restore header frame_ctl to the original data setting.
+ */
+ header.frame_ctl = cpu_to_le16(fc);
+
+ if (ieee->config &
+ (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_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 (encrypt)
- skb_reserve(skb_frag, crypt->ops->extra_prefix_len);
+ if (host_encrypt || host_build_iv)
+ skb_reserve(skb_frag,
+ crypt->ops->extra_mpdu_prefix_len);
- frag_hdr = (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len);
+ frag_hdr =
+ (struct ieee80211_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);
+ 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;
}
- /* Put a SNAP header on the first fragment */
- if (i == 0) {
- ieee80211_put_snap(
- skb_put(skb_frag, SNAP_SIZE + sizeof(u16)),
- ether_type);
+ if (i == 0 && !snapped) {
+ ieee80211_copy_snap(skb_put
+ (skb_frag, SNAP_SIZE + sizeof(u16)),
+ ether_type);
bytes -= SNAP_SIZE + sizeof(u16);
}
- memcpy(skb_put(skb_frag, bytes), skb->data, bytes);
+ 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 (encrypt)
+ if (host_encrypt)
ieee80211_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_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
skb_put(skb_frag, 4);
}
-
- success:
+ success:
spin_unlock_irqrestore(&ieee->lock, flags);
dev_kfree_skb_any(skb);
if (txb) {
- if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
+ int ret = (*ieee->hard_start_xmit) (txb, dev, priority);
+ if (ret == 0) {
stats->tx_packets++;
stats->tx_bytes += txb->payload_size;
return 0;
}
+
ieee80211_txb_free(txb);
}
return 0;
- failed:
+ failed:
spin_unlock_irqrestore(&ieee->lock, flags);
netif_stop_queue(dev);
stats->tx_errors++;
return 1;
-
}
EXPORT_SYMBOL(ieee80211_txb_free);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff