Commit e65b0f46 authored by Samuel Ortiz's avatar Samuel Ortiz Committed by John W. Linville
Browse files

NFC: Fragment LLCP I frames 



Based on the receiver MIU, we have to fragment the frame to be
transmitted.

Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent eda21f16

net/nfc/llcp/commands.c

+43 −14
Original line number Diff line number Diff line
@@ -444,30 +444,59 @@ int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, 
				struct msghdr *msg, size_t len)

{

	struct sk_buff *pdu;

	struct sock *sk;

	struct sock *sk = &sock->sk;

	struct nfc_llcp_local *local;

	size_t frag_len = 0, remaining_len;

	u8 *msg_data, *msg_ptr;



	pr_debug("Send I frame len %zd\n", len);



	local = sock->local;

	if (local == NULL)

		return -ENODEV;



	msg_data = kzalloc(len, GFP_KERNEL);

	if (msg_data == NULL)

		return -ENOMEM;



	pr_debug("Send I frame\n");

	if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {

			kfree(msg_data);

			return -EFAULT;

	}



	pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, len + LLCP_SEQUENCE_SIZE);

	remaining_len = len;

	msg_ptr = msg_data;



	while (remaining_len > 0) {



		frag_len = min_t(u16, local->remote_miu, remaining_len);



		pr_debug("Fragment %zd bytes remaining %zd",

			 frag_len, remaining_len);



		pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,

					frag_len + LLCP_SEQUENCE_SIZE);

		if (pdu == NULL)

			return -ENOMEM;



		skb_put(pdu, LLCP_SEQUENCE_SIZE);



	if (memcpy_fromiovec(skb_put(pdu, len), msg->msg_iov, len)) {

		kfree_skb(pdu);

		return -EFAULT;

	}

		memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);



		skb_queue_head(&sock->tx_queue, pdu);



	sk = &sock->sk;

		lock_sock(sk);



		nfc_llcp_queue_i_frames(sock);



		release_sock(sk);



		remaining_len -= frag_len;

		msg_ptr += len;

	}



	kfree(msg_data);



	return 0;

}