llcp.c 27.1 KB
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/*
 * Copyright (C) 2011  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#define pr_fmt(fmt) "llcp: %s: " fmt, __func__

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/nfc.h>

#include "../nfc.h"
#include "llcp.h"

static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};

static struct list_head llcp_devices;

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void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
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{
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	write_lock(&l->lock);
	sk_add_node(sk, &l->head);
	write_unlock(&l->lock);
}
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void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
{
	write_lock(&l->lock);
	sk_del_node_init(sk);
	write_unlock(&l->lock);
}
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static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
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{
	struct sock *sk;
	struct hlist_node *node, *tmp;
	struct nfc_llcp_sock *llcp_sock;
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	write_lock(&local->sockets.lock);
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	sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
		llcp_sock = nfc_llcp_sock(sk);
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		bh_lock_sock(sk);
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		if (sk->sk_state == LLCP_CONNECTED)
			nfc_put_device(llcp_sock->dev);
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		if (sk->sk_state == LLCP_LISTEN) {
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			struct nfc_llcp_sock *lsk, *n;
			struct sock *accept_sk;

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			list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
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						 accept_queue) {
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				accept_sk = &lsk->sk;
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				bh_lock_sock(accept_sk);
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				nfc_llcp_accept_unlink(accept_sk);

				accept_sk->sk_state = LLCP_CLOSED;

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				bh_unlock_sock(accept_sk);
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				sock_orphan(accept_sk);
			}
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			if (listen == true) {
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				bh_unlock_sock(sk);
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				continue;
			}
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		}

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		sk->sk_state = LLCP_CLOSED;
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		bh_unlock_sock(sk);
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		sock_orphan(sk);
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		sk_del_node_init(sk);
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	}

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	write_unlock(&local->sockets.lock);
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}

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struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
{
	kref_get(&local->ref);

	return local;
}

static void local_release(struct kref *ref)
{
	struct nfc_llcp_local *local;

	local = container_of(ref, struct nfc_llcp_local, ref);

	list_del(&local->list);
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	nfc_llcp_socket_release(local, false);
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	del_timer_sync(&local->link_timer);
	skb_queue_purge(&local->tx_queue);
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	cancel_work_sync(&local->tx_work);
	cancel_work_sync(&local->rx_work);
	cancel_work_sync(&local->timeout_work);
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	kfree_skb(local->rx_pending);
	kfree(local);
}

int nfc_llcp_local_put(struct nfc_llcp_local *local)
{
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	if (local == NULL)
		return 0;

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	return kref_put(&local->ref, local_release);
}

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static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
					       u8 ssap, u8 dsap)
{
	struct sock *sk;
	struct hlist_node *node;
	struct nfc_llcp_sock *llcp_sock;

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

	if (ssap == 0 && dsap == 0)
		return NULL;

	read_lock(&local->sockets.lock);

	llcp_sock = NULL;

	sk_for_each(sk, node, &local->sockets.head) {
		llcp_sock = nfc_llcp_sock(sk);

		if (llcp_sock->ssap == ssap && llcp_sock->dsap == dsap)
			break;
	}

	read_unlock(&local->sockets.lock);

	if (llcp_sock == NULL)
		return NULL;

	sock_hold(&llcp_sock->sk);

	return llcp_sock;
}

static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
{
	sock_put(&sock->sk);
}

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static void nfc_llcp_timeout_work(struct work_struct *work)
{
	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
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						    timeout_work);
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	nfc_dep_link_down(local->dev);
}

static void nfc_llcp_symm_timer(unsigned long data)
{
	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;

	pr_err("SYMM timeout\n");

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	schedule_work(&local->timeout_work);
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}

struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
{
	struct nfc_llcp_local *local, *n;

	list_for_each_entry_safe(local, n, &llcp_devices, list)
		if (local->dev == dev)
			return local;

	pr_debug("No device found\n");

	return NULL;
}

static char *wks[] = {
	NULL,
	NULL, /* SDP */
	"urn:nfc:sn:ip",
	"urn:nfc:sn:obex",
	"urn:nfc:sn:snep",
};

static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
{
	int sap, num_wks;

	pr_debug("%s\n", service_name);

	if (service_name == NULL)
		return -EINVAL;

	num_wks = ARRAY_SIZE(wks);

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	for (sap = 0; sap < num_wks; sap++) {
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		if (wks[sap] == NULL)
			continue;

		if (strncmp(wks[sap], service_name, service_name_len) == 0)
			return sap;
	}

	return -EINVAL;
}

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static
struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
					    u8 *sn, size_t sn_len)
{
	struct sock *sk;
	struct hlist_node *node;
	struct nfc_llcp_sock *llcp_sock, *tmp_sock;

	pr_debug("sn %zd %p\n", sn_len, sn);

	if (sn == NULL || sn_len == 0)
		return NULL;

	read_lock(&local->sockets.lock);

	llcp_sock = NULL;

	sk_for_each(sk, node, &local->sockets.head) {
		tmp_sock = nfc_llcp_sock(sk);

		pr_debug("llcp sock %p\n", tmp_sock);

		if (tmp_sock->sk.sk_state != LLCP_LISTEN)
			continue;

		if (tmp_sock->service_name == NULL ||
		    tmp_sock->service_name_len == 0)
			continue;

		if (tmp_sock->service_name_len != sn_len)
			continue;

		if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
			llcp_sock = tmp_sock;
			break;
		}
	}

	read_unlock(&local->sockets.lock);

	pr_debug("Found llcp sock %p\n", llcp_sock);

	return llcp_sock;
}

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u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
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			 struct nfc_llcp_sock *sock)
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{
	mutex_lock(&local->sdp_lock);

	if (sock->service_name != NULL && sock->service_name_len > 0) {
		int ssap = nfc_llcp_wks_sap(sock->service_name,
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					    sock->service_name_len);
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		if (ssap > 0) {
			pr_debug("WKS %d\n", ssap);

			/* This is a WKS, let's check if it's free */
			if (local->local_wks & BIT(ssap)) {
				mutex_unlock(&local->sdp_lock);

				return LLCP_SAP_MAX;
			}

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			set_bit(ssap, &local->local_wks);
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			mutex_unlock(&local->sdp_lock);

			return ssap;
		}

		/*
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		 * Check if there already is a non WKS socket bound
		 * to this service name.
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		 */
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		if (nfc_llcp_sock_from_sn(local, sock->service_name,
					  sock->service_name_len) != NULL) {
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			mutex_unlock(&local->sdp_lock);

			return LLCP_SAP_MAX;
		}

		mutex_unlock(&local->sdp_lock);

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		return LLCP_SDP_UNBOUND;
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	} else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
		if (!test_bit(sock->ssap, &local->local_wks)) {
			set_bit(sock->ssap, &local->local_wks);
			mutex_unlock(&local->sdp_lock);
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			return sock->ssap;
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		}
	}

	mutex_unlock(&local->sdp_lock);

	return LLCP_SAP_MAX;
}

u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
{
	u8 local_ssap;

	mutex_lock(&local->sdp_lock);

	local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
	if (local_ssap == LLCP_LOCAL_NUM_SAP) {
		mutex_unlock(&local->sdp_lock);
		return LLCP_SAP_MAX;
	}

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	set_bit(local_ssap, &local->local_sap);
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	mutex_unlock(&local->sdp_lock);

	return local_ssap + LLCP_LOCAL_SAP_OFFSET;
}

void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
{
	u8 local_ssap;
	unsigned long *sdp;

	if (ssap < LLCP_WKS_NUM_SAP) {
		local_ssap = ssap;
		sdp = &local->local_wks;
	} else if (ssap < LLCP_LOCAL_NUM_SAP) {
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		atomic_t *client_cnt;

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		local_ssap = ssap - LLCP_WKS_NUM_SAP;
		sdp = &local->local_sdp;
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		client_cnt = &local->local_sdp_cnt[local_ssap];

		pr_debug("%d clients\n", atomic_read(client_cnt));

		mutex_lock(&local->sdp_lock);

		if (atomic_dec_and_test(client_cnt)) {
			struct nfc_llcp_sock *l_sock;

			pr_debug("No more clients for SAP %d\n", ssap);

			clear_bit(local_ssap, sdp);

			/* Find the listening sock and set it back to UNBOUND */
			l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
			if (l_sock) {
				l_sock->ssap = LLCP_SDP_UNBOUND;
				nfc_llcp_sock_put(l_sock);
			}
		}

		mutex_unlock(&local->sdp_lock);

		return;
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	} else if (ssap < LLCP_MAX_SAP) {
		local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
		sdp = &local->local_sap;
	} else {
		return;
	}

	mutex_lock(&local->sdp_lock);

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	clear_bit(local_ssap, sdp);
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	mutex_unlock(&local->sdp_lock);
}

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static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
{
	u8 ssap;

	mutex_lock(&local->sdp_lock);

	ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
	if (ssap == LLCP_SDP_NUM_SAP) {
		mutex_unlock(&local->sdp_lock);

		return LLCP_SAP_MAX;
	}

	pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);

	set_bit(ssap, &local->local_sdp);

	mutex_unlock(&local->sdp_lock);

	return LLCP_WKS_NUM_SAP + ssap;
}

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static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
{
	u8 *gb_cur, *version_tlv, version, version_length;
	u8 *lto_tlv, lto, lto_length;
	u8 *wks_tlv, wks_length;
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	u8 *miux_tlv, miux_length;
	__be16 miux;
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	u8 gb_len = 0;
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	int ret = 0;
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	version = LLCP_VERSION_11;
	version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
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					 1, &version_length);
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	gb_len += version_length;

	/* 1500 ms */
	lto = 150;
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	lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &lto, 1, &lto_length);
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	gb_len += lto_length;

	pr_debug("Local wks 0x%lx\n", local->local_wks);
	wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
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				     &wks_length);
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	gb_len += wks_length;

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	miux = cpu_to_be16(LLCP_MAX_MIUX);
	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
				      &miux_length);
	gb_len += miux_length;

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	gb_len += ARRAY_SIZE(llcp_magic);

	if (gb_len > NFC_MAX_GT_LEN) {
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		ret = -EINVAL;
		goto out;
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	}

	gb_cur = local->gb;

	memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
	gb_cur += ARRAY_SIZE(llcp_magic);

	memcpy(gb_cur, version_tlv, version_length);
	gb_cur += version_length;

	memcpy(gb_cur, lto_tlv, lto_length);
	gb_cur += lto_length;

	memcpy(gb_cur, wks_tlv, wks_length);
	gb_cur += wks_length;

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	memcpy(gb_cur, miux_tlv, miux_length);
	gb_cur += miux_length;

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	local->gb_len = gb_len;

out:
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	kfree(version_tlv);
	kfree(lto_tlv);
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	kfree(wks_tlv);
	kfree(miux_tlv);
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	return ret;
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}

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u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
{
	struct nfc_llcp_local *local;

	local = nfc_llcp_find_local(dev);
	if (local == NULL) {
		*general_bytes_len = 0;
		return NULL;
	}

	nfc_llcp_build_gb(local);

	*general_bytes_len = local->gb_len;

	return local->gb;
}

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int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
{
	struct nfc_llcp_local *local = nfc_llcp_find_local(dev);

	if (local == NULL) {
		pr_err("No LLCP device\n");
		return -ENODEV;
	}

	memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
	memcpy(local->remote_gb, gb, gb_len);
	local->remote_gb_len = gb_len;

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	if (local->remote_gb == NULL || local->remote_gb_len == 0)
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		return -ENODEV;

	if (memcmp(local->remote_gb, llcp_magic, 3)) {
		pr_err("MAC does not support LLCP\n");
		return -EINVAL;
	}

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	return nfc_llcp_parse_gb_tlv(local,
				     &local->remote_gb[3],
				     local->remote_gb_len - 3);
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}

static u8 nfc_llcp_dsap(struct sk_buff *pdu)
{
	return (pdu->data[0] & 0xfc) >> 2;
}

static u8 nfc_llcp_ptype(struct sk_buff *pdu)
{
	return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
}

static u8 nfc_llcp_ssap(struct sk_buff *pdu)
{
	return pdu->data[1] & 0x3f;
}

static u8 nfc_llcp_ns(struct sk_buff *pdu)
{
	return pdu->data[2] >> 4;
}

static u8 nfc_llcp_nr(struct sk_buff *pdu)
{
	return pdu->data[2] & 0xf;
}

static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
{
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	pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
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	sock->send_n = (sock->send_n + 1) % 16;
	sock->recv_ack_n = (sock->recv_n - 1) % 16;
}

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void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
			       struct sk_buff *skb, u8 direction)
{
	struct hlist_node *node;
	struct sk_buff *skb_copy = NULL, *nskb;
	struct sock *sk;
	u8 *data;

	read_lock(&local->raw_sockets.lock);

	sk_for_each(sk, node, &local->raw_sockets.head) {
		if (sk->sk_state != LLCP_BOUND)
			continue;

		if (skb_copy == NULL) {
			skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
					       GFP_ATOMIC);

			if (skb_copy == NULL)
				continue;

			data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);

			data[0] = local->dev ? local->dev->idx : 0xFF;
			data[1] = direction;
		}

		nskb = skb_clone(skb_copy, GFP_ATOMIC);
		if (!nskb)
			continue;

		if (sock_queue_rcv_skb(sk, nskb))
			kfree_skb(nskb);
	}

	read_unlock(&local->raw_sockets.lock);

	kfree_skb(skb_copy);
}

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static void nfc_llcp_tx_work(struct work_struct *work)
{
	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
						    tx_work);
	struct sk_buff *skb;
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock;

	skb = skb_dequeue(&local->tx_queue);
	if (skb != NULL) {
		sk = skb->sk;
		llcp_sock = nfc_llcp_sock(sk);
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		if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
			nfc_llcp_send_symm(local->dev);
		} else {
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			int ret;

			pr_debug("Sending pending skb\n");
			print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
				       DUMP_PREFIX_OFFSET, 16, 1,
				       skb->data, skb->len, true);

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			nfc_llcp_send_to_raw_sock(local, skb,
						  NFC_LLCP_DIRECTION_TX);

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			ret = nfc_data_exchange(local->dev, local->target_idx,
						skb, nfc_llcp_recv, local);

			if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
				skb = skb_get(skb);
				skb_queue_tail(&llcp_sock->tx_pending_queue,
					       skb);
			}
		}
	} else {
		nfc_llcp_send_symm(local->dev);
	}

	mod_timer(&local->link_timer,
		  jiffies + msecs_to_jiffies(2 * local->remote_lto));
}

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static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
							  u8 ssap)
{
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock;
	struct hlist_node *node;

	read_lock(&local->connecting_sockets.lock);

	sk_for_each(sk, node, &local->connecting_sockets.head) {
		llcp_sock = nfc_llcp_sock(sk);

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		if (llcp_sock->ssap == ssap) {
			sock_hold(&llcp_sock->sk);
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			goto out;
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		}
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	}

	llcp_sock = NULL;

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	read_unlock(&local->connecting_sockets.lock);

	return llcp_sock;
}

static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
						  u8 *sn, size_t sn_len)
{
	struct nfc_llcp_sock *llcp_sock;

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	llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
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	if (llcp_sock == NULL)
		return NULL;
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	sock_hold(&llcp_sock->sk);

	return llcp_sock;
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}

static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
{
	u8 *tlv = &skb->data[2], type, length;
	size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;

	while (offset < tlv_array_len) {
		type = tlv[0];
		length = tlv[1];

		pr_debug("type 0x%x length %d\n", type, length);

		if (type == LLCP_TLV_SN) {
			*sn_len = length;
			return &tlv[2];
		}

		offset += length + 2;
		tlv += length + 2;
	}

	return NULL;
}

static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
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				  struct sk_buff *skb)
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{
	struct sock *new_sk, *parent;
	struct nfc_llcp_sock *sock, *new_sock;
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	u8 dsap, ssap, reason;
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	dsap = nfc_llcp_dsap(skb);
	ssap = nfc_llcp_ssap(skb);

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

	if (dsap != LLCP_SAP_SDP) {
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		sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
		if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
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			reason = LLCP_DM_NOBOUND;
			goto fail;
		}
	} else {
		u8 *sn;
		size_t sn_len;

		sn = nfc_llcp_connect_sn(skb, &sn_len);
		if (sn == NULL) {
			reason = LLCP_DM_NOBOUND;
			goto fail;
		}

		pr_debug("Service name length %zu\n", sn_len);

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		sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
		if (sock == NULL) {
			reason = LLCP_DM_NOBOUND;
			goto fail;
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		}
	}

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	lock_sock(&sock->sk);
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	parent = &sock->sk;

	if (sk_acceptq_is_full(parent)) {
		reason = LLCP_DM_REJ;
		release_sock(&sock->sk);
		sock_put(&sock->sk);
		goto fail;
	}

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	if (sock->ssap == LLCP_SDP_UNBOUND) {
		u8 ssap = nfc_llcp_reserve_sdp_ssap(local);

		pr_debug("First client, reserving %d\n", ssap);

		if (ssap == LLCP_SAP_MAX) {
			reason = LLCP_DM_REJ;
			release_sock(&sock->sk);
			sock_put(&sock->sk);
			goto fail;
		}

		sock->ssap = ssap;
	}

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	new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
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	if (new_sk == NULL) {
		reason = LLCP_DM_REJ;
		release_sock(&sock->sk);
		sock_put(&sock->sk);
		goto fail;
	}

	new_sock = nfc_llcp_sock(new_sk);
	new_sock->dev = local->dev;
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	new_sock->local = nfc_llcp_local_get(local);
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	new_sock->miu = local->remote_miu;
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	new_sock->nfc_protocol = sock->nfc_protocol;
	new_sock->dsap = ssap;
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	new_sock->target_idx = local->target_idx;
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	new_sock->parent = parent;
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	new_sock->ssap = sock->ssap;
	if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
		atomic_t *client_count;

		pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);

		client_count =
			&local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];

		atomic_inc(client_count);
		new_sock->reserved_ssap = sock->ssap;
	}
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	nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
				      skb->len - LLCP_HEADER_SIZE);

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	pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);

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	nfc_llcp_sock_link(&local->sockets, new_sk);
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	nfc_llcp_accept_enqueue(&sock->sk, new_sk);

	nfc_get_device(local->dev->idx);

	new_sk->sk_state = LLCP_CONNECTED;

	/* Wake the listening processes */
	parent->sk_data_ready(parent, 0);

	/* Send CC */
	nfc_llcp_send_cc(new_sock);

	release_sock(&sock->sk);
	sock_put(&sock->sk);

	return;

fail:
	/* Send DM */
	nfc_llcp_send_dm(local, dsap, ssap, reason);

	return;

}

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int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
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{
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	struct nfc_llcp_local *local = sock->local;

	pr_debug("Remote ready %d tx queue len %d remote rw %d",
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		 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
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		 sock->rw);
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	/* Try to queue some I frames for transmission */
	while (sock->remote_ready &&
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	       skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
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		struct sk_buff *pdu;
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		pdu = skb_dequeue(&sock->tx_queue);
		if (pdu == NULL)
			break;

		/* Update N(S)/N(R) */
		nfc_llcp_set_nrns(sock, pdu);

		skb_queue_tail(&local->tx_queue, pdu);
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		nr_frames++;
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	}
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	return nr_frames;
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}

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static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
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			       struct sk_buff *skb)
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{
	struct nfc_llcp_sock *llcp_sock;
	struct sock *sk;
	u8 dsap, ssap, ptype, ns, nr;

	ptype = nfc_llcp_ptype(skb);
	dsap = nfc_llcp_dsap(skb);
	ssap = nfc_llcp_ssap(skb);
	ns = nfc_llcp_ns(skb);
	nr = nfc_llcp_nr(skb);

	pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);

	llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
	if (llcp_sock == NULL) {
		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
		return;
	}

	sk = &llcp_sock->sk;
	lock_sock(sk);
	if (sk->sk_state == LLCP_CLOSED) {
		release_sock(sk);
		nfc_llcp_sock_put(llcp_sock);
	}

	/* Pass the payload upstream */
	if (ptype == LLCP_PDU_I) {
		pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);

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		if (ns == llcp_sock->recv_n)
			llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
		else
			pr_err("Received out of sequence I PDU\n");

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		skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_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);
		}
	}

	/* Remove skbs from the pending queue */
	if (llcp_sock->send_ack_n != nr) {
		struct sk_buff *s, *tmp;

		llcp_sock->send_ack_n = nr;

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		/* Remove and free all skbs until ns == nr */
		skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
			skb_unlink(s, &llcp_sock->tx_pending_queue);
			kfree_skb(s);

			if (nfc_llcp_ns(s) == nr)
				break;
		}

		/* Re-queue the remaining skbs for transmission */
		skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
					    s, tmp) {
			skb_unlink(s, &llcp_sock->tx_pending_queue);
			skb_queue_head(&local->tx_queue, s);
		}
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	}

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	if (ptype == LLCP_PDU_RR)
		llcp_sock->remote_ready = true;
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	else if (ptype == LLCP_PDU_RNR)
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		llcp_sock->remote_ready = false;

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	if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
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		nfc_llcp_send_rr(llcp_sock);
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	release_sock(sk);
	nfc_llcp_sock_put(llcp_sock);
}

static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
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			       struct sk_buff *skb)
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{
	struct nfc_llcp_sock *llcp_sock;
	struct sock *sk;
	u8 dsap, ssap;

	dsap = nfc_llcp_dsap(skb);
	ssap = nfc_llcp_ssap(skb);

	llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
	if (llcp_sock == NULL) {
		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
		return;
	}

	sk = &llcp_sock->sk;
	lock_sock(sk);
	if (sk->sk_state == LLCP_CLOSED) {
		release_sock(sk);
		nfc_llcp_sock_put(llcp_sock);
	}

	if (sk->sk_state == LLCP_CONNECTED) {
		nfc_put_device(local->dev);
		sk->sk_state = LLCP_CLOSED;
		sk->sk_state_change(sk);
	}

	nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);

	release_sock(sk);
	nfc_llcp_sock_put(llcp_sock);
}

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static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
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{
	struct nfc_llcp_sock *llcp_sock;
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	struct sock *sk;
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	u8 dsap, ssap;

	dsap = nfc_llcp_dsap(skb);
	ssap = nfc_llcp_ssap(skb);

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	llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
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	if (llcp_sock == NULL) {
		pr_err("Invalid CC\n");
		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);

		return;
	}

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	sk = &llcp_sock->sk;
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	/* Unlink from connecting and link to the client array */
	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
	nfc_llcp_sock_link(&local->sockets, sk);
	llcp_sock->dsap = ssap;

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	nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
				      skb->len - LLCP_HEADER_SIZE);
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