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NFC: Handle LLCP UI frames

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

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-10-15 16:14:37 +02:00
parent c8512be63b
commit 968272bf00
2 changed files with 45 additions and 0 deletions
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38
net/nfc/llcp/llcp.c
View File

@ -720,6 +720,39 @@ static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
return NULL; 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, static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
struct sk_buff *skb) struct sk_buff *skb)
{ {
@ -1177,6 +1210,11 @@ static void nfc_llcp_rx_work(struct work_struct *work)
pr_debug("SYMM\n"); pr_debug("SYMM\n");
break; break;
case LLCP_PDU_UI:
pr_debug("UI\n");
nfc_llcp_recv_ui(local, skb);
break;
case LLCP_PDU_CONNECT: case LLCP_PDU_CONNECT:
pr_debug("CONNECT\n"); pr_debug("CONNECT\n");
nfc_llcp_recv_connect(local, skb); nfc_llcp_recv_connect(local, skb);

7
net/nfc/llcp/llcp.h
View File

@ -124,6 +124,13 @@ struct nfc_llcp_sock {
struct sock *parent; 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_sock(sk) ((struct nfc_llcp_sock *) (sk))
#define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev) #define nfc_llcp_dev(sk) (nfc_llcp_sock((sk))->dev)