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 (file)
--- a/net/nfc/llcp/commands.c
+++ b/net/nfc/llcp/commands.c
@@ -420,6 +420,52 @@ error_tlv:
        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;

diff --git a/net/nfc/llcp/llcp.h b/net/nfc/llcp/llcp.h
index fdb2d24..1c0a66f 100644 (file)
--- a/net/nfc/llcp/llcp.h
+++ b/net/nfc/llcp/llcp.h
@@ -209,6 +209,7 @@ int nfc_llcp_disconnect(struct nfc_llcp_sock *sock);
 int nfc_llcp_send_symm(struct nfc_dev *dev);
 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock);
 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock);
+int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap);
 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason);
 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock);
 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,