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mac802154: tx: add warning if MTU exceeds

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Sending over AF_PACKET RAW sockets we can sending frames which exceeds
MTU size. To handling it correct we need to change things in AF_PACKET
which knows on RAW sockets an additional FCS is set by hardware or
mac802154 transmit functionality.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-09-18 11:30:44 +02:00 committed by Marcel Holtmann
parent 87a93e4ece
commit 02c7b69228
1 changed files with 11 additions and 0 deletions
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11
net/mac802154/tx.c
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@ -71,6 +71,17 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
struct net_device *dev = skb->dev;
int ret;
/* This check is for AF_PACKET RAW socket only, which doesn't
* know about the FCS which is set here or by hardware. otherwise
* it should not occur in any case!
*
* TODO: This should be handled in AF_PACKET and return -EMSGSIZE.
*/
if (skb->len > IEEE802154_MTU - IEEE802154_FCS_LEN) {
netdev_warn(dev, "Frame len above MTU limit. Dropped.\n");
goto err_tx;
}
if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
u16 crc = crc_ccitt(0, skb->data, skb->len);