This patch adds a new hardware flag which indicate that the transceiver
doesn't support check for bad checksum via hardware. Also add a handling of
this while receive.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
include/net/mac802154.h | 2 ++
net/mac802154/rx.c | 15 +++++++++++++--
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index bc1d40c..8f1de68 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -96,6 +96,8 @@ struct ieee802154_hw {
#define IEEE802154_HW_PROMISCUOUS 0x00000200
/* Indicates that receiver omits FCS. */
#define IEEE802154_HW_RX_OMIT_CKSUM 0x00000400
+/* Indicates that receiver will not filter frames with bad checksum. */
+#define IEEE802154_HW_RX_DROP_BAD_CKSUM 0x00000800
/* Indicates that receiver omits FCS and xmitter will add FCS on it's own. */
#define IEEE802154_HW_OMIT_CKSUM (IEEE802154_HW_TX_OMIT_CKSUM | \
diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
index b6a4bbf..c9f1c72 100644
--- a/net/mac802154/rx.c
+++ b/net/mac802154/rx.c
@@ -248,6 +248,7 @@ ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
{
struct ieee802154_local *local = hw_to_local(hw);
+ u16 crc;
WARN_ON_ONCE(softirq_count() == 0);
@@ -256,8 +257,7 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
* solution because the monitor needs a crc here.
*/
if (local->hw.flags & IEEE802154_HW_RX_OMIT_CKSUM) {
- u16 crc = crc_ccitt(0, skb->data, skb->len);
-
+ crc = crc_ccitt(0, skb->data, skb->len);
put_unaligned_le16(crc, skb_put(skb, 2));
}
@@ -265,6 +265,17 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
ieee802154_monitors_rx(local, skb);
+ /* Check if transceiver doesn't validate the checksum.
+ * If not we validate the checksum here.
+ */
+ if (local->hw.flags & IEEE802154_HW_RX_DROP_BAD_CKSUM) {
+ crc = crc_ccitt(0, skb->data, skb->len);
+ if (crc) {
+ rcu_read_unlock();
+ kfree_skb(skb);
+ return;
+ }
+ }
/* remove crc */
skb_trim(skb, skb->len - 2);
--
2.1.2
--
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