diff options
| author | Ivo van Doorn <ivdoorn@gmail.com> | 2008-01-06 23:40:27 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-01-10 16:18:25 -0500 |
| commit | c5d0dc5f0dd66770232d7d360c770d2344b76d52 (patch) | |
| tree | 8a0347ce38d9132f2bd839425d5984a8540ca2cd /drivers/net/wireless/rt2x00 | |
| parent | dd87145d2c3a7b1c8b338e1f6e174b3d2a17cd35 (diff) | |
rt2x00: Put 802.11 data on 4 byte boundary
Check the size of the ieee80211 header during rxdone
and make sure the data behind the ieee80211 header
is placed on a 4 byte boundary.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00pci.c | 20 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00usb.c | 17 |
2 files changed, 31 insertions, 6 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.c b/drivers/net/wireless/rt2x00/rt2x00pci.c index 2780df00623..6d5d9aba0b7 100644 --- a/drivers/net/wireless/rt2x00/rt2x00pci.c +++ b/drivers/net/wireless/rt2x00/rt2x00pci.c @@ -124,7 +124,10 @@ void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev) struct data_entry *entry; struct data_desc *rxd; struct sk_buff *skb; + struct ieee80211_hdr *hdr; struct rxdata_entry_desc desc; + int header_size; + int align; u32 word; while (1) { @@ -138,17 +141,26 @@ void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev) memset(&desc, 0x00, sizeof(desc)); rt2x00dev->ops->lib->fill_rxdone(entry, &desc); + hdr = (struct ieee80211_hdr *)entry->data_addr; + header_size = + ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)); + + /* + * The data behind the ieee80211 header must be + * aligned on a 4 byte boundary. + */ + align = NET_IP_ALIGN + (2 * (header_size % 4 == 0)); + /* * Allocate the sk_buffer, initialize it and copy * all data into it. */ - skb = dev_alloc_skb(desc.size + NET_IP_ALIGN); + skb = dev_alloc_skb(desc.size + align); if (!skb) return; - skb_reserve(skb, NET_IP_ALIGN); - skb_put(skb, desc.size); - memcpy(skb->data, entry->data_addr, desc.size); + skb_reserve(skb, align); + memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size); /* * Send the frame to rt2x00lib for further processing. diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c index 1f5675dd329..ab4797ed94c 100644 --- a/drivers/net/wireless/rt2x00/rt2x00usb.c +++ b/drivers/net/wireless/rt2x00/rt2x00usb.c @@ -221,7 +221,9 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb) struct data_ring *ring = entry->ring; struct rt2x00_dev *rt2x00dev = ring->rt2x00dev; struct sk_buff *skb; + struct ieee80211_hdr *hdr; struct rxdata_entry_desc desc; + int header_size; int frame_size; if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) || @@ -253,9 +255,20 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb) skb_put(skb, frame_size); /* - * Trim the skb_buffer to only contain the valid - * frame data (so ignore the device's descriptor). + * The data behind the ieee80211 header must be + * aligned on a 4 byte boundary. + * After that trim the entire buffer down to only + * contain the valid frame data excluding the device + * descriptor. */ + hdr = (struct ieee80211_hdr *)entry->skb->data; + header_size = + ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)); + + if (header_size % 4 == 0) { + skb_push(entry->skb, 2); + memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2); + } skb_trim(entry->skb, desc.size); /* |