NFC: Add SNL frame building routine
SNL (Service Name Lookup) frames are used to respond to SNL requests.
This is needed for SDP implementation.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c
index 5e33cba..6db280d 100644
--- a/net/nfc/llcp/commands.c
+++ b/net/nfc/llcp/commands.c
@@ -420,6 +420,52 @@
return err;
}
+int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap)
+{
+ struct sk_buff *skb;
+ struct nfc_dev *dev;
+ u8 *sdres_tlv = NULL, sdres_tlv_length, sdres[2];
+ u16 size = 0;
+
+ pr_debug("Sending SNL tid 0x%x sap 0x%x\n", tid, sap);
+
+ if (local == NULL)
+ return -ENODEV;
+
+ dev = local->dev;
+ if (dev == NULL)
+ return -ENODEV;
+
+ sdres[0] = tid;
+ sdres[1] = sap;
+ sdres_tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, sdres, 0,
+ &sdres_tlv_length);
+ if (sdres_tlv == NULL)
+ return -ENOMEM;
+
+ size += LLCP_HEADER_SIZE;
+ size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
+ size += sdres_tlv_length;
+
+ skb = alloc_skb(size, GFP_KERNEL);
+ if (skb == NULL) {
+ kfree(sdres_tlv);
+ return -ENOMEM;
+ }
+
+ skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
+
+ skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
+
+ memcpy(skb_put(skb, sdres_tlv_length), sdres_tlv, sdres_tlv_length);
+
+ skb_queue_tail(&local->tx_queue, skb);
+
+ kfree(sdres_tlv);
+
+ return 0;
+}
+
int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
{
struct sk_buff *skb;