Commit c43bb03d authored by Samuel Ortiz's avatar Samuel Ortiz
Browse files

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: default avatarSamuel Ortiz <>
parent 92223906
......@@ -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,
if (sdres_tlv == NULL)
return -ENOMEM;
size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
size += sdres_tlv_length;
skb = alloc_skb(size, GFP_KERNEL);
if (skb == NULL) {
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);
return 0;
int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
struct sk_buff *skb;
......@@ -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,
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