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authorMark A. Greer <mgreer@animalcreek.com>2014-09-23 23:38:08 (GMT)
committerSamuel Ortiz <sameo@linux.intel.com>2014-11-28 11:38:59 (GMT)
commitb08147cbc4d1b63d65f6c7c522fed9ef3212bc52 (patch)
tree4e58372b062ffba93328d78a4f84e7cc8c2abd52 /include
parent485fdc9bb6f81d68aa30b399b9bc33cf27d65ba4 (diff)
downloadlinux-b08147cbc4d1b63d65f6c7c522fed9ef3212bc52.tar.xz
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 <thierry.escande@linux.intel.com> Tested-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/net/nfc/digital.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
index 80c6183..42dbc6e 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);