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Commit 968272bf authored by Samuel Ortiz's avatar Samuel Ortiz
Browse files

NFC: Handle LLCP UI frames 



UI (Unnumbered Information) frames are used for sending data over
connection less links.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent c8512be6

net/nfc/llcp/llcp.c

+38 −0
Original line number Diff line number Diff line
@@ -720,6 +720,39 @@ static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) 
	return NULL;

}



static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,

			     struct sk_buff *skb)

{

	struct nfc_llcp_sock *llcp_sock;

	struct nfc_llcp_ui_cb *ui_cb;

	u8 dsap, ssap;



	dsap = nfc_llcp_dsap(skb);

	ssap = nfc_llcp_ssap(skb);



	ui_cb = nfc_llcp_ui_skb_cb(skb);

	ui_cb->dsap = dsap;

	ui_cb->ssap = ssap;



	printk("%s %d %d\n", __func__, dsap, ssap);



	pr_debug("%d %d\n", dsap, ssap);



	/* We're looking for a bound socket, not a client one */

	llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);

	if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)

		return;



	/* There is no sequence with UI frames */

	skb_pull(skb, LLCP_HEADER_SIZE);

	if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {

		pr_err("receive queue is full\n");

		skb_queue_head(&llcp_sock->tx_backlog_queue, skb);

	}



	nfc_llcp_sock_put(llcp_sock);

}



static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,

				  struct sk_buff *skb)

{
@@ -1177,6 +1210,11 @@ static void nfc_llcp_rx_work(struct work_struct *work) 
		pr_debug("SYMM\n");

		break;



	case LLCP_PDU_UI:

		pr_debug("UI\n");

		nfc_llcp_recv_ui(local, skb);

		break;



	case LLCP_PDU_CONNECT:

		pr_debug("CONNECT\n");

		nfc_llcp_recv_connect(local, skb);

net/nfc/llcp/llcp.h

+7 −0
Original line number Diff line number Diff line
@@ -124,6 +124,13 @@ struct nfc_llcp_sock { 
	struct sock *parent;

};



struct nfc_llcp_ui_cb {

	__u8 dsap;

	__u8 ssap;

};



#define nfc_llcp_ui_skb_cb(__skb) ((struct nfc_llcp_ui_cb *)&((__skb)->cb[0]))



#define nfc_llcp_sock(sk) ((struct nfc_llcp_sock *) (sk))

#define nfc_llcp_dev(sk)  (nfc_llcp_sock((sk))->dev)