Add checking the "CRC_OK" bit at the end of incoming packets to make
sure the cc2520 driver only passes up valid packets. Because the AUTOCRC
bit in the FRMCTRL0 register is set to 1 after init, the CC2520 handles
checking the CRC of incoming packets and sets the most significant bit
of the last byte of the incoming packet to 1 if the check passed. This
patch simply checks that bit.
Signed-off-by: Brad Campbell <bradjc5@xxxxxxxxx>
---
drivers/net/ieee802154/cc2520.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c
index e65b605..b54edbf 100644
--- a/drivers/net/ieee802154/cc2520.c
+++ b/drivers/net/ieee802154/cc2520.c
@@ -450,6 +450,17 @@ cc2520_read_rxfifo(struct cc2520_private *priv, u8 *data, u8 len, u8 *lqi)
mutex_unlock(&priv->buffer_mutex);
+ /* If we are reading the actual packet and not just the length byte,
+ * check that the CRC is valid.
+ */
+ if (len > 1) {
+ /* Most significant bit of the last byte of the data buffer
+ * is a 1 bit CRC indicator. See section 20.3.4.
+ */
+ if (data[len - 1] >> 7 == 0)
+ return -EINVAL;
+ }
+
return status;
}
--
2.6.3
--
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