From b08147cbc4d1b63d65f6c7c522fed9ef3212bc52 Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 23 Sep 2014 16:38:08 -0700 Subject: NFC: digital: Implement NFC-DEP max payload lengths The maximum payload for NFC-DEP exchanges (i.e., the number of bytes between SoD and EoD) is negotiated using the ATR_REQ, ATR_RES, and PSL_REQ commands. The valid maximum lengths are 64, 128, 192, and 254 bytes. Currently, NFC-DEP code assumes that both sides are always using 254 byte maximums and ignores attempts by the peer to change it. Instead, implement the negotiation code, enforce the local maximum when receiving data from the peer, and don't send payloads that exceed the remote's maximum. The default local maximum is 254 bytes. Reviewed-by: Thierry Escande Tested-by: Thierry Escande Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- include/net/nfc/digital.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/net/nfc') diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h index 80c6183989f3..42dbc6e6ee21 100644 --- a/include/net/nfc/digital.h +++ b/include/net/nfc/digital.h @@ -227,6 +227,9 @@ struct nfc_digital_dev { u8 curr_nfc_dep_pni; u8 did; + u8 local_payload_max; + u8 remote_payload_max; + u16 target_fsc; int (*skb_check_crc)(struct sk_buff *skb); -- cgit v1.2.3