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| author | Alexander Aring <alex.aring@gmail.com> | 2015-09-18 11:30:44 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-09-22 11:51:20 +0200 |
| commit | 02c7b6922899621aa8e8babe27fca7b6b2e497b0 (patch) | |
| tree | 6b9ab5b1dac2512b6341af6dd0f7e9b2003ff6fc /net/mac802154 | |
| parent | 87a93e4eceb495f93e3f37b100334d2641765b6c (diff) | |
| download | lwn-02c7b6922899621aa8e8babe27fca7b6b2e497b0.tar.gz lwn-02c7b6922899621aa8e8babe27fca7b6b2e497b0.zip | |
mac802154: tx: add warning if MTU exceeds
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>
Diffstat (limited to 'net/mac802154')
| -rw-r--r-- | net/mac802154/tx.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c index 66d7ecb7c56b..5ee596e00a6d 100644 --- a/net/mac802154/tx.c +++ b/net/mac802154/tx.c @@ -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); |