/* Tx path */
/********************************************************************/
+/* Add encapsulation and MIC to the existing SKB.
+ * The main xmit routine will then send the whole lot to the card.
+ * Need 8 bytes headroom
+ * Need 8 bytes tailroom
+ *
+ * With encapsulated ethernet II frame
+ * --------
+ * 803.3 header (14 bytes)
+ * dst[6]
+ * -------- src[6]
+ * 803.3 header (14 bytes) len[2]
+ * dst[6] 803.2 header (8 bytes)
+ * src[6] encaps[6]
+ * len[2] <- leave alone -> len[2]
+ * -------- -------- <-- 0
+ * Payload Payload
+ * ... ...
+ *
+ * -------- --------
+ * MIC (8 bytes)
+ * --------
+ *
+ * returns 0 on success, -ENOMEM on error.
+ */
+int orinoco_process_xmit_skb(struct sk_buff *skb,
+ struct net_device *dev,
+ struct orinoco_private *priv,
+ int *tx_control,
+ u8 *mic_buf)
+{
+ struct orinoco_tkip_key *key;
+ struct ethhdr *eh;
+ int do_mic;
+
+ key = (struct orinoco_tkip_key *) priv->keys[priv->tx_key].key;
+
+ do_mic = ((priv->encode_alg == ORINOCO_ALG_TKIP) &&
+ (key != NULL));
+
+ if (do_mic)
+ *tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) |
+ HERMES_TXCTRL_MIC;
+
+ eh = (struct ethhdr *)skb->data;
+
+ /* Encapsulate Ethernet-II frames */
+ if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
+ struct header_struct {
+ struct ethhdr eth; /* 802.3 header */
+ u8 encap[6]; /* 802.2 header */
+ } __attribute__ ((packed)) hdr;
+ int len = skb->len + sizeof(encaps_hdr) - (2 * ETH_ALEN);
+
+ if (skb_headroom(skb) < ENCAPS_OVERHEAD) {
+ if (net_ratelimit())
+ printk(KERN_ERR
+ "%s: Not enough headroom for 802.2 headers %d\n",
+ dev->name, skb_headroom(skb));
+ return -ENOMEM;
+ }
+
+ /* Fill in new header */
+ memcpy(&hdr.eth, eh, 2 * ETH_ALEN);
+ hdr.eth.h_proto = htons(len);
+ memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr));
+
+ /* Make room for the new header, and copy it in */
+ eh = (struct ethhdr *) skb_push(skb, ENCAPS_OVERHEAD);
+ memcpy(eh, &hdr, sizeof(hdr));
+ }
+
+ /* Calculate Michael MIC */
+ if (do_mic) {
+ size_t len = skb->len - ETH_HLEN;
+ u8 *mic = &mic_buf[0];
+
+ /* Have to write to an even address, so copy the spare
+ * byte across */
+ if (skb->len % 2) {
+ *mic = skb->data[skb->len - 1];
+ mic++;
+ }
+
+ orinoco_mic(priv->tx_tfm_mic, key->tx_mic,
+ eh->h_dest, eh->h_source, 0 /* priority */,
+ skb->data + ETH_HLEN,
+ len, mic);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(orinoco_process_xmit_skb);
+
static netdev_tx_t orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
- struct orinoco_tkip_key *key;
hermes_t *hw = &priv->hw;
int err = 0;
u16 txfid = priv->txfid;
- struct ethhdr *eh;
int tx_control;
unsigned long flags;
- int do_mic;
+ u8 mic_buf[MICHAEL_MIC_LEN+1];
if (!netif_running(dev)) {
printk(KERN_ERR "%s: Tx on stopped device!\n",
if (skb->len < ETH_HLEN)
goto drop;
- key = (struct orinoco_tkip_key *) priv->keys[priv->tx_key].key;
-
- do_mic = ((priv->encode_alg == ORINOCO_ALG_TKIP) &&
- (key != NULL));
-
tx_control = HERMES_TXCTRL_TX_OK | HERMES_TXCTRL_TX_EX;
- if (do_mic)
- tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) |
- HERMES_TXCTRL_MIC;
+ err = orinoco_process_xmit_skb(skb, dev, priv, &tx_control,
+ &mic_buf[0]);
+ if (err)
+ goto drop;
if (priv->has_alt_txcntl) {
/* WPA enabled firmwares have tx_cntl at the end of
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 {
- struct ethhdr eth; /* 802.3 header */
- u8 encap[6]; /* 802.2 header */
- } __attribute__ ((packed)) hdr;
-
- /* Strip destination and source from the data */
- skb_pull(skb, 2 * ETH_ALEN);
-
- /* 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));
-
- /* 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;
- }
- eh = (struct ethhdr *) skb_push(skb, sizeof(hdr));
- memcpy(eh, &hdr, sizeof(hdr));
- }
-
err = hw->ops->bap_pwrite(hw, USER_BAP, skb->data, skb->len,
txfid, HERMES_802_3_OFFSET);
if (err) {
goto busy;
}
- /* Calculate Michael MIC */
- if (do_mic) {
- u8 mic_buf[MICHAEL_MIC_LEN + 1];
- u8 *mic;
- size_t offset;
- size_t len;
+ if (tx_control & HERMES_TXCTRL_MIC) {
+ size_t offset = HERMES_802_3_OFFSET + skb->len;
+ size_t len = MICHAEL_MIC_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;
+ if (offset % 2) {
+ offset--;
+ len++;
}
-
- orinoco_mic(priv->tx_tfm_mic, key->tx_mic,
- eh->h_dest, eh->h_source, 0 /* priority */,
- skb->data + ETH_HLEN, skb->len - ETH_HLEN, mic);
-
- /* Write the MIC */
err = hw->ops->bap_pwrite(hw, USER_BAP, &mic_buf[0], len,
- txfid, HERMES_802_3_OFFSET + offset);
+ txfid, offset);
if (err) {
printk(KERN_ERR "%s: Error %d writing MIC to BAP\n",
dev->name, err);
/* 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;
+ dev->needed_headroom = ENCAPS_OVERHEAD;
netif_carrier_off(dev);
#include <linux/wireless.h>
#include <linux/firmware.h>
+#include "mic.h"
#include "orinoco.h"
#ifndef URB_ASYNC_UNLINK
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct ezusb_priv *upriv = priv->card;
+ u8 mic[MICHAEL_MIC_LEN+1];
int err = 0;
- char *p;
- struct ethhdr *eh;
- int len, data_len, data_off;
- __le16 tx_control;
+ int tx_control;
unsigned long flags;
struct request_context *ctx;
u8 *buf;
if (orinoco_lock(priv, &flags) != 0) {
printk(KERN_ERR
- "%s: orinoco_xmit() called while hw_unavailable\n",
+ "%s: ezusb_xmit() called while hw_unavailable\n",
dev->name);
return NETDEV_TX_BUSY;
}
/* Oops, the firmware hasn't established a connection,
silently drop the packet (this seems to be the
safest approach). */
- stats->tx_errors++;
- orinoco_unlock(priv, &flags);
- dev_kfree_skb(skb);
- return NETDEV_TX_OK;
+ goto drop;
}
+ /* Check packet length */
+ if (skb->len < ETH_HLEN)
+ goto drop;
+
ctx = ezusb_alloc_ctx(upriv, EZUSB_RID_TX, 0);
if (!ctx)
- goto fail;
+ goto busy;
memset(ctx->buf, 0, BULK_BUF_SIZE);
buf = ctx->buf->data;
- /* Length of the packet body */
- /* FIXME: what if the skb is smaller than this? */
- len = max_t(int, skb->len - ETH_HLEN, ETH_ZLEN - ETH_HLEN);
-
- eh = (struct ethhdr *) skb->data;
-
- tx_control = cpu_to_le16(0);
- memcpy(buf, &tx_control, sizeof(tx_control));
- buf += sizeof(tx_control);
- /* Encapsulate Ethernet-II frames */
- if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
- struct header_struct *hdr = (void *) buf;
- buf += sizeof(*hdr);
- data_len = len;
- data_off = sizeof(tx_control) + sizeof(*hdr);
- p = skb->data + ETH_HLEN;
-
- /* 802.3 header */
- memcpy(hdr->dest, eh->h_dest, ETH_ALEN);
- memcpy(hdr->src, eh->h_source, ETH_ALEN);
- hdr->len = htons(data_len + ENCAPS_OVERHEAD);
-
- /* 802.2 header */
- memcpy(&hdr->dsap, &encaps_hdr, sizeof(encaps_hdr));
-
- hdr->ethertype = eh->h_proto;
- } else { /* IEEE 802.3 frame */
- data_len = len + ETH_HLEN;
- data_off = sizeof(tx_control);
- p = skb->data;
+ tx_control = 0;
+
+ err = orinoco_process_xmit_skb(skb, dev, priv, &tx_control,
+ &mic[0]);
+ if (err)
+ goto drop;
+
+ {
+ __le16 *tx_cntl = (__le16 *)buf;
+ *tx_cntl = cpu_to_le16(tx_control);
+ buf += sizeof(*tx_cntl);
}
- memcpy(buf, p, data_len);
- buf += data_len;
+ memcpy(buf, skb->data, skb->len);
+ buf += skb->len;
+
+ if (tx_control & HERMES_TXCTRL_MIC) {
+ u8 *m = mic;
+ /* Mic has been offset so it can be copied to an even
+ * address. We're copying eveything anyway, so we
+ * don't need to copy that first byte. */
+ if (skb->len % 2)
+ m++;
+ memcpy(buf, m, MICHAEL_MIC_LEN);
+ buf += MICHAEL_MIC_LEN;
+ }
/* Finally, we actually initiate the send */
netif_stop_queue(dev);
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d transmitting packet\n",
dev->name, err);
- stats->tx_errors++;
- goto fail;
+ goto busy;
}
dev->trans_start = jiffies;
- stats->tx_bytes += data_off + data_len;
+ stats->tx_bytes += skb->len;
+ goto ok;
- orinoco_unlock(priv, &flags);
+ drop:
+ stats->tx_errors++;
+ stats->tx_dropped++;
+ ok:
+ orinoco_unlock(priv, &flags);
dev_kfree_skb(skb);
-
return NETDEV_TX_OK;
- fail:
+ busy:
orinoco_unlock(priv, &flags);
return NETDEV_TX_BUSY;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff