[deliverable/linux.git] / net / nfc / llcp_commands.c

/*
 * 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, see <http://www.gnu.org/licenses/>.
 */

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

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

#include <net/nfc/nfc.h>

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

static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
	0,
	1, /* VERSION */
	2, /* MIUX */
	2, /* WKS */
	1, /* LTO */
	1, /* RW */
	0, /* SN */
	1, /* OPT */
	0, /* SDREQ */
	2, /* SDRES */

};

static u8 llcp_tlv8(u8 *tlv, u8 type)
{
	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
		return 0;

	return tlv[2];
}

static u16 llcp_tlv16(u8 *tlv, u8 type)
{
	if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
		return 0;

	return be16_to_cpu(*((__be16 *)(tlv + 2)));
}


static u8 llcp_tlv_version(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
}

static u16 llcp_tlv_miux(u8 *tlv)
{
	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
}

static u16 llcp_tlv_wks(u8 *tlv)
{
	return llcp_tlv16(tlv, LLCP_TLV_WKS);
}

static u16 llcp_tlv_lto(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_LTO);
}

static u8 llcp_tlv_opt(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_OPT);
}

static u8 llcp_tlv_rw(u8 *tlv)
{
	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
}

u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
{
	u8 *tlv, length;

	pr_debug("type %d\n", type);

	if (type >= LLCP_TLV_MAX)
		return NULL;

	length = llcp_tlv_length[type];
	if (length == 0 && value_length == 0)
		return NULL;
	else if (length == 0)
		length = value_length;

	*tlv_length = 2 + length;
	tlv = kzalloc(2 + length, GFP_KERNEL);
	if (tlv == NULL)
		return tlv;

	tlv[0] = type;
	tlv[1] = length;
	memcpy(tlv + 2, value, length);

	return tlv;
}

struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
{
	struct nfc_llcp_sdp_tlv *sdres;
	u8 value[2];

	sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
	if (sdres == NULL)
		return NULL;

	value[0] = tid;
	value[1] = sap;

	sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
					&sdres->tlv_len);
	if (sdres->tlv == NULL) {
		kfree(sdres);
		return NULL;
	}

	sdres->tid = tid;
	sdres->sap = sap;

	INIT_HLIST_NODE(&sdres->node);

	return sdres;
}

struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
						  size_t uri_len)
{
	struct nfc_llcp_sdp_tlv *sdreq;

	pr_debug("uri: %s, len: %zu\n", uri, uri_len);

	sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
	if (sdreq == NULL)
		return NULL;

	sdreq->tlv_len = uri_len + 3;

	if (uri[uri_len - 1] == 0)
		sdreq->tlv_len--;

	sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
	if (sdreq->tlv == NULL) {
		kfree(sdreq);
		return NULL;
	}

	sdreq->tlv[0] = LLCP_TLV_SDREQ;
	sdreq->tlv[1] = sdreq->tlv_len - 2;
	sdreq->tlv[2] = tid;

	sdreq->tid = tid;
	sdreq->uri = sdreq->tlv + 3;
	memcpy(sdreq->uri, uri, uri_len);

	sdreq->time = jiffies;

	INIT_HLIST_NODE(&sdreq->node);

	return sdreq;
}

void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
{
	kfree(sdp->tlv);
	kfree(sdp);
}

void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
{
	struct nfc_llcp_sdp_tlv *sdp;
	struct hlist_node *n;

	hlist_for_each_entry_safe(sdp, n, head, node) {
		hlist_del(&sdp->node);

		nfc_llcp_free_sdp_tlv(sdp);
	}
}

int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
			  u8 *tlv_array, u16 tlv_array_len)
{
	u8 *tlv = tlv_array, type, length, offset = 0;

	pr_debug("TLV array length %d\n", tlv_array_len);

	if (local == NULL)
		return -ENODEV;

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

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

		switch (type) {
		case LLCP_TLV_VERSION:
			local->remote_version = llcp_tlv_version(tlv);
			break;
		case LLCP_TLV_MIUX:
			local->remote_miu = llcp_tlv_miux(tlv) + 128;
			break;
		case LLCP_TLV_WKS:
			local->remote_wks = llcp_tlv_wks(tlv);
			break;
		case LLCP_TLV_LTO:
			local->remote_lto = llcp_tlv_lto(tlv) * 10;
			break;
		case LLCP_TLV_OPT:
			local->remote_opt = llcp_tlv_opt(tlv);
			break;
		default:
			pr_err("Invalid gt tlv value 0x%x\n", type);
			break;
		}

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

	pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
		 local->remote_version, local->remote_miu,
		 local->remote_lto, local->remote_opt,
		 local->remote_wks);

	return 0;
}

int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
				  u8 *tlv_array, u16 tlv_array_len)
{
	u8 *tlv = tlv_array, type, length, offset = 0;

	pr_debug("TLV array length %d\n", tlv_array_len);

	if (sock == NULL)
		return -ENOTCONN;

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

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

		switch (type) {
		case LLCP_TLV_MIUX:
			sock->remote_miu = llcp_tlv_miux(tlv) + 128;
			break;
		case LLCP_TLV_RW:
			sock->remote_rw = llcp_tlv_rw(tlv);
			break;
		case LLCP_TLV_SN:
			break;
		default:
			pr_err("Invalid gt tlv value 0x%x\n", type);
			break;
		}

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

	pr_debug("sock %p rw %d miu %d\n", sock,
		 sock->remote_rw, sock->remote_miu);

	return 0;
}

static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
				       u8 dsap, u8 ssap, u8 ptype)
{
	u8 header[2];

	pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);

	header[0] = (u8)((dsap << 2) | (ptype >> 2));
	header[1] = (u8)((ptype << 6) | ssap);

	pr_debug("header 0x%x 0x%x\n", header[0], header[1]);

	memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);

	return pdu;
}

static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
				    u8 tlv_length)
{
	/* XXX Add an skb length check */

	if (tlv == NULL)
		return NULL;

	memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);

	return pdu;
}

static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
					 u8 cmd, u16 size)
{
	struct sk_buff *skb;
	int err;

	if (sock->ssap == 0)
		return NULL;

	skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
				 size + LLCP_HEADER_SIZE, &err);
	if (skb == NULL) {
		pr_err("Could not allocate PDU\n");
		return NULL;
	}

	skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);

	return skb;
}

int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
{
	struct sk_buff *skb;
	struct nfc_dev *dev;
	struct nfc_llcp_local *local;

	pr_debug("Sending DISC\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	dev = sock->dev;
	if (dev == NULL)
		return -ENODEV;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
	if (skb == NULL)
		return -ENOMEM;

	skb_queue_tail(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_symm(struct nfc_dev *dev)
{
	struct sk_buff *skb;
	struct nfc_llcp_local *local;
	u16 size = 0;

	pr_debug("Sending SYMM\n");

	local = nfc_llcp_find_local(dev);
	if (local == NULL)
		return -ENODEV;

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	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, 0, 0, LLCP_PDU_SYMM);

	__net_timestamp(skb);

	nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);

	return nfc_data_exchange(dev, local->target_idx, skb,
				 nfc_llcp_recv, local);
}

int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
{
	struct nfc_llcp_local *local;
	struct sk_buff *skb;
	u8 *service_name_tlv = NULL, service_name_tlv_length;
	u8 *miux_tlv = NULL, miux_tlv_length;
	u8 *rw_tlv = NULL, rw_tlv_length, rw;
	int err;
	u16 size = 0, miux;

	pr_debug("Sending CONNECT\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	if (sock->service_name != NULL) {
		service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
						      sock->service_name,
						      sock->service_name_len,
						      &service_name_tlv_length);
		size += service_name_tlv_length;
	}

	/* If the socket parameters are not set, use the local ones */
	miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
		local->miux : sock->miux;
	rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;

	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
				      &miux_tlv_length);
	size += miux_tlv_length;

	rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
	size += rw_tlv_length;

	pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);

	skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
	if (skb == NULL) {
		err = -ENOMEM;
		goto error_tlv;
	}

	if (service_name_tlv != NULL)
		skb = llcp_add_tlv(skb, service_name_tlv,
				   service_name_tlv_length);

	skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
	skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);

	skb_queue_tail(&local->tx_queue, skb);

	return 0;

error_tlv:
	pr_err("error %d\n", err);

	kfree(service_name_tlv);
	kfree(miux_tlv);
	kfree(rw_tlv);

	return err;
}

int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
{
	struct nfc_llcp_local *local;
	struct sk_buff *skb;
	u8 *miux_tlv = NULL, miux_tlv_length;
	u8 *rw_tlv = NULL, rw_tlv_length, rw;
	int err;
	u16 size = 0, miux;

	pr_debug("Sending CC\n");

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	/* If the socket parameters are not set, use the local ones */
	miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
		local->miux : sock->miux;
	rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;

	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
				      &miux_tlv_length);
	size += miux_tlv_length;

	rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
	size += rw_tlv_length;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
	if (skb == NULL) {
		err = -ENOMEM;
		goto error_tlv;
	}

	skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
	skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);

	skb_queue_tail(&local->tx_queue, skb);

	return 0;

error_tlv:
	pr_err("error %d\n", err);

	kfree(miux_tlv);
	kfree(rw_tlv);

	return err;
}

static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
					     size_t tlv_length)
{
	struct sk_buff *skb;
	struct nfc_dev *dev;
	u16 size = 0;

	if (local == NULL)
		return ERR_PTR(-ENODEV);

	dev = local->dev;
	if (dev == NULL)
		return ERR_PTR(-ENODEV);

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
	size += tlv_length;

	skb = alloc_skb(size, GFP_KERNEL);
	if (skb == NULL)
		return ERR_PTR(-ENOMEM);

	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);

	skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);

	return skb;
}

int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
			    struct hlist_head *tlv_list, size_t tlvs_len)
{
	struct nfc_llcp_sdp_tlv *sdp;
	struct hlist_node *n;
	struct sk_buff *skb;

	skb = nfc_llcp_allocate_snl(local, tlvs_len);
	if (IS_ERR(skb))
		return PTR_ERR(skb);

	hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
		memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);

		hlist_del(&sdp->node);

		nfc_llcp_free_sdp_tlv(sdp);
	}

	skb_queue_tail(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
			    struct hlist_head *tlv_list, size_t tlvs_len)
{
	struct nfc_llcp_sdp_tlv *sdreq;
	struct hlist_node *n;
	struct sk_buff *skb;

	skb = nfc_llcp_allocate_snl(local, tlvs_len);
	if (IS_ERR(skb))
		return PTR_ERR(skb);

	mutex_lock(&local->sdreq_lock);

	if (hlist_empty(&local->pending_sdreqs))
		mod_timer(&local->sdreq_timer,
			  jiffies + msecs_to_jiffies(3 * local->remote_lto));

	hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
		pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);

		memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv,
		       sdreq->tlv_len);

		hlist_del(&sdreq->node);

		hlist_add_head(&sdreq->node, &local->pending_sdreqs);
	}

	mutex_unlock(&local->sdreq_lock);

	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;
	struct nfc_dev *dev;
	u16 size = 1; /* Reason code */

	pr_debug("Sending DM reason 0x%x\n", reason);

	if (local == NULL)
		return -ENODEV;

	dev = local->dev;
	if (dev == NULL)
		return -ENODEV;

	size += LLCP_HEADER_SIZE;
	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;

	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, dsap, ssap, LLCP_PDU_DM);

	memcpy(skb_put(skb, 1), &reason, 1);

	skb_queue_head(&local->tx_queue, skb);

	return 0;
}

int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
			  struct msghdr *msg, size_t len)
{
	struct sk_buff *pdu;
	struct sock *sk = &sock->sk;
	struct nfc_llcp_local *local;
	size_t frag_len = 0, remaining_len;
	u8 *msg_data, *msg_ptr;
	u16 remote_miu;

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

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	/* Remote is ready but has not acknowledged our frames */
	if((sock->remote_ready &&
	    skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
	    skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
		pr_err("Pending queue is full %d frames\n",
		       skb_queue_len(&sock->tx_pending_queue));
		return -ENOBUFS;
	}

	/* Remote is not ready and we've been queueing enough frames */
	if ((!sock->remote_ready &&
	     skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
		pr_err("Tx queue is full %d frames\n",
		       skb_queue_len(&sock->tx_queue));
		return -ENOBUFS;
	}

	msg_data = kzalloc(len, GFP_KERNEL);
	if (msg_data == NULL)
		return -ENOMEM;

	if (memcpy_from_msg(msg_data, msg, len)) {
		kfree(msg_data);
		return -EFAULT;
	}

	remaining_len = len;
	msg_ptr = msg_data;

	do {
		remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
				LLCP_DEFAULT_MIU : sock->remote_miu;

		frag_len = min_t(size_t, 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) {
			kfree(msg_data);
			return -ENOMEM;
		}

		skb_put(pdu, LLCP_SEQUENCE_SIZE);

		if (likely(frag_len > 0))
			memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);

		skb_queue_tail(&sock->tx_queue, pdu);

		lock_sock(sk);

		nfc_llcp_queue_i_frames(sock);

		release_sock(sk);

		remaining_len -= frag_len;
		msg_ptr += frag_len;
	} while (remaining_len > 0);

	kfree(msg_data);

	return len;
}

int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
			   struct msghdr *msg, size_t len)
{
	struct sk_buff *pdu;
	struct nfc_llcp_local *local;
	size_t frag_len = 0, remaining_len;
	u8 *msg_ptr, *msg_data;
	u16 remote_miu;
	int err;

	pr_debug("Send UI 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;

	if (memcpy_from_msg(msg_data, msg, len)) {
		kfree(msg_data);
		return -EFAULT;
	}

	remaining_len = len;
	msg_ptr = msg_data;

	do {
		remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
				local->remote_miu : sock->remote_miu;

		frag_len = min_t(size_t, remote_miu, remaining_len);

		pr_debug("Fragment %zd bytes remaining %zd",
			 frag_len, remaining_len);

		pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
					 frag_len + LLCP_HEADER_SIZE, &err);
		if (pdu == NULL) {
			pr_err("Could not allocate PDU\n");
			continue;
		}

		pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);

		if (likely(frag_len > 0))
			memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);

		/* No need to check for the peer RW for UI frames */
		skb_queue_tail(&local->tx_queue, pdu);

		remaining_len -= frag_len;
		msg_ptr += frag_len;
	} while (remaining_len > 0);

	kfree(msg_data);

	return len;
}

int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
{
	struct sk_buff *skb;
	struct nfc_llcp_local *local;

	pr_debug("Send rr nr %d\n", sock->recv_n);

	local = sock->local;
	if (local == NULL)
		return -ENODEV;

	skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
	if (skb == NULL)
		return -ENOMEM;

	skb_put(skb, LLCP_SEQUENCE_SIZE);

	skb->data[2] = sock->recv_n;

	skb_queue_head(&local->tx_queue, skb);

	return 0;
}
Commit	Line	Data
d646960f SO	1	/*
	2	* Copyright (C) 2011 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
98b32dec	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
d646960f SO	16	*/
	17
	18	#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
	19
	20	#include <linux/init.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/nfc.h>
	24
	25	#include <net/nfc/nfc.h>
	26
30cc4587	27	#include "nfc.h"
d646960f SO	28	#include "llcp.h"
	29
	30	static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
	31	0,
	32	1, /* VERSION */
	33	2, /* MIUX */
	34	2, /* WKS */
	35	1, /* LTO */
	36	1, /* RW */
	37	0, /* SN */
	38	1, /* OPT */
	39	0, /* SDREQ */
	40	2, /* SDRES */
	41
	42	};
	43
	44	static u8 llcp_tlv8(u8 *tlv, u8 type)
	45	{
	46	if (tlv[0] != type \|\| tlv[1] != llcp_tlv_length[tlv[0]])
	47	return 0;
	48
	49	return tlv[2];
	50	}
	51
76762b73	52	static u16 llcp_tlv16(u8 *tlv, u8 type)
d646960f SO	53	{
	54	if (tlv[0] != type \|\| tlv[1] != llcp_tlv_length[tlv[0]])
	55	return 0;
	56
	57	return be16_to_cpu(((__be16 )(tlv + 2)));
	58	}
	59
	60
	61	static u8 llcp_tlv_version(u8 *tlv)
	62	{
	63	return llcp_tlv8(tlv, LLCP_TLV_VERSION);
	64	}
	65
	66	static u16 llcp_tlv_miux(u8 *tlv)
	67	{
76762b73	68	return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
d646960f SO	69	}
	70
	71	static u16 llcp_tlv_wks(u8 *tlv)
	72	{
	73	return llcp_tlv16(tlv, LLCP_TLV_WKS);
	74	}
	75
	76	static u16 llcp_tlv_lto(u8 *tlv)
	77	{
	78	return llcp_tlv8(tlv, LLCP_TLV_LTO);
	79	}
	80
	81	static u8 llcp_tlv_opt(u8 *tlv)
	82	{
	83	return llcp_tlv8(tlv, LLCP_TLV_OPT);
	84	}
	85
	86	static u8 llcp_tlv_rw(u8 *tlv)
	87	{
	88	return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
	89	}
	90
	91	u8 nfc_llcp_build_tlv(u8 type, u8 value, u8 value_length, u8 *tlv_length)
	92	{
	93	u8 *tlv, length;
	94
	95	pr_debug("type %d\n", type);
	96
	97	if (type >= LLCP_TLV_MAX)
	98	return NULL;
	99
	100	length = llcp_tlv_length[type];
	101	if (length == 0 && value_length == 0)
	102	return NULL;
324b0af6	103	else if (length == 0)
d646960f SO	104	length = value_length;
	105
	106	*tlv_length = 2 + length;
	107	tlv = kzalloc(2 + length, GFP_KERNEL);
	108	if (tlv == NULL)
	109	return tlv;
	110
	111	tlv[0] = type;
	112	tlv[1] = length;
	113	memcpy(tlv + 2, value, length);
	114
	115	return tlv;
	116	}
	117
e0ae7bac TE	118	struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
	119	{
	120	struct nfc_llcp_sdp_tlv *sdres;
	121	u8 value[2];
	122
	123	sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
	124	if (sdres == NULL)
	125	return NULL;
	126
	127	value[0] = tid;
	128	value[1] = sap;
	129
	130	sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
	131	&sdres->tlv_len);
	132	if (sdres->tlv == NULL) {
	133	kfree(sdres);
	134	return NULL;
	135	}
	136
	137	sdres->tid = tid;
	138	sdres->sap = sap;
	139
	140	INIT_HLIST_NODE(&sdres->node);
	141
	142	return sdres;
	143	}
	144
d9b8d8e1 TE	145	struct nfc_llcp_sdp_tlv nfc_llcp_build_sdreq_tlv(u8 tid, char uri,
	146	size_t uri_len)
	147	{
	148	struct nfc_llcp_sdp_tlv *sdreq;
	149
	150	pr_debug("uri: %s, len: %zu\n", uri, uri_len);
	151
	152	sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
	153	if (sdreq == NULL)
	154	return NULL;
	155
	156	sdreq->tlv_len = uri_len + 3;
	157
	158	if (uri[uri_len - 1] == 0)
	159	sdreq->tlv_len--;
	160
	161	sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
	162	if (sdreq->tlv == NULL) {
	163	kfree(sdreq);
	164	return NULL;
	165	}
	166
	167	sdreq->tlv[0] = LLCP_TLV_SDREQ;
	168	sdreq->tlv[1] = sdreq->tlv_len - 2;
	169	sdreq->tlv[2] = tid;
	170
	171	sdreq->tid = tid;
	172	sdreq->uri = sdreq->tlv + 3;
	173	memcpy(sdreq->uri, uri, uri_len);
	174
40213fa8 TE	175	sdreq->time = jiffies;
40213fa8 TE	176
d9b8d8e1 TE	177	INIT_HLIST_NODE(&sdreq->node);
	178
	179	return sdreq;
	180	}
	181
e0ae7bac TE	182	void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
	183	{
	184	kfree(sdp->tlv);
	185	kfree(sdp);
	186	}
	187
d9b8d8e1 TE	188	void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
	189	{
	190	struct nfc_llcp_sdp_tlv *sdp;
	191	struct hlist_node *n;
	192
	193	hlist_for_each_entry_safe(sdp, n, head, node) {
	194	hlist_del(&sdp->node);
	195
	196	nfc_llcp_free_sdp_tlv(sdp);
	197	}
	198	}
	199
7a06e586 SO	200	int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
7a06e586 SO	201	u8 *tlv_array, u16 tlv_array_len)
d646960f SO	202	{
	203	u8 *tlv = tlv_array, type, length, offset = 0;
	204
	205	pr_debug("TLV array length %d\n", tlv_array_len);
	206
	207	if (local == NULL)
	208	return -ENODEV;
	209
	210	while (offset < tlv_array_len) {
	211	type = tlv[0];
	212	length = tlv[1];
	213
	214	pr_debug("type 0x%x length %d\n", type, length);
	215
	216	switch (type) {
	217	case LLCP_TLV_VERSION:
	218	local->remote_version = llcp_tlv_version(tlv);
	219	break;
	220	case LLCP_TLV_MIUX:
	221	local->remote_miu = llcp_tlv_miux(tlv) + 128;
	222	break;
	223	case LLCP_TLV_WKS:
	224	local->remote_wks = llcp_tlv_wks(tlv);
	225	break;
	226	case LLCP_TLV_LTO:
	227	local->remote_lto = llcp_tlv_lto(tlv) * 10;
	228	break;
	229	case LLCP_TLV_OPT:
	230	local->remote_opt = llcp_tlv_opt(tlv);
	231	break;
7a06e586 SO	232	default:
	233	pr_err("Invalid gt tlv value 0x%x\n", type);
	234	break;
	235	}
	236
	237	offset += length + 2;
	238	tlv += length + 2;
	239	}
	240
	241	pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
	242	local->remote_version, local->remote_miu,
	243	local->remote_lto, local->remote_opt,
	244	local->remote_wks);
	245
	246	return 0;
	247	}
	248
	249	int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
	250	u8 *tlv_array, u16 tlv_array_len)
	251	{
	252	u8 *tlv = tlv_array, type, length, offset = 0;
	253
	254	pr_debug("TLV array length %d\n", tlv_array_len);
	255
	256	if (sock == NULL)
	257	return -ENOTCONN;
	258
	259	while (offset < tlv_array_len) {
	260	type = tlv[0];
	261	length = tlv[1];
	262
	263	pr_debug("type 0x%x length %d\n", type, length);
	264
	265	switch (type) {
93d7e490	266	case LLCP_TLV_MIUX:
e4306bec	267	sock->remote_miu = llcp_tlv_miux(tlv) + 128;
93d7e490	268	break;
d646960f	269	case LLCP_TLV_RW:
e4306bec	270	sock->remote_rw = llcp_tlv_rw(tlv);
d646960f	271	break;
9dda50f4 SO	272	case LLCP_TLV_SN:
9dda50f4 SO	273	break;
d646960f SO	274	default:
	275	pr_err("Invalid gt tlv value 0x%x\n", type);
	276	break;
	277	}
	278
	279	offset += length + 2;
	280	tlv += length + 2;
	281	}
	282
e4306bec SO	283	pr_debug("sock %p rw %d miu %d\n", sock,
e4306bec SO	284	sock->remote_rw, sock->remote_miu);
d646960f SO	285
	286	return 0;
	287	}
	288
	289	static struct sk_buff llcp_add_header(struct sk_buff pdu,
427a2eb1	290	u8 dsap, u8 ssap, u8 ptype)
d646960f SO	291	{
	292	u8 header[2];
	293
	294	pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
	295
	296	header[0] = (u8)((dsap << 2) \| (ptype >> 2));
	297	header[1] = (u8)((ptype << 6) \| ssap);
	298
	299	pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
	300
	301	memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
	302
	303	return pdu;
	304	}
	305
427a2eb1 SO	306	static struct sk_buff llcp_add_tlv(struct sk_buff pdu, u8 *tlv,
427a2eb1 SO	307	u8 tlv_length)
d646960f SO	308	{
	309	/* XXX Add an skb length check */
	310
	311	if (tlv == NULL)
	312	return NULL;
	313
	314	memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
	315
	316	return pdu;
	317	}
	318
	319	static struct sk_buff llcp_allocate_pdu(struct nfc_llcp_sock sock,
427a2eb1	320	u8 cmd, u16 size)
d646960f SO	321	{
	322	struct sk_buff *skb;
	323	int err;
	324
	325	if (sock->ssap == 0)
	326	return NULL;
	327
	328	skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
427a2eb1	329	size + LLCP_HEADER_SIZE, &err);
d646960f SO	330	if (skb == NULL) {
	331	pr_err("Could not allocate PDU\n");
	332	return NULL;
	333	}
	334
	335	skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
	336
	337	return skb;
	338	}
	339
58e3dd15	340	int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
d646960f SO	341	{
	342	struct sk_buff *skb;
	343	struct nfc_dev *dev;
	344	struct nfc_llcp_local *local;
d646960f SO	345
	346	pr_debug("Sending DISC\n");
	347
	348	local = sock->local;
	349	if (local == NULL)
	350	return -ENODEV;
	351
	352	dev = sock->dev;
	353	if (dev == NULL)
	354	return -ENODEV;
	355
92223906	356	skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
d646960f SO	357	if (skb == NULL)
	358	return -ENOMEM;
	359
d646960f SO	360	skb_queue_tail(&local->tx_queue, skb);
	361
	362	return 0;
	363	}
	364
	365	int nfc_llcp_send_symm(struct nfc_dev *dev)
	366	{
	367	struct sk_buff *skb;
	368	struct nfc_llcp_local *local;
	369	u16 size = 0;
	370
	371	pr_debug("Sending SYMM\n");
	372
	373	local = nfc_llcp_find_local(dev);
	374	if (local == NULL)
	375	return -ENODEV;
	376
	377	size += LLCP_HEADER_SIZE;
	378	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
	379
	380	skb = alloc_skb(size, GFP_KERNEL);
	381	if (skb == NULL)
	382	return -ENOMEM;
	383
	384	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
	385
	386	skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
	387
2c2d45bd TE	388	__net_timestamp(skb);
2c2d45bd TE	389
57be1f3f	390	nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
4463523b	391
d646960f	392	return nfc_data_exchange(dev, local->target_idx, skb,
427a2eb1	393	nfc_llcp_recv, local);
d646960f SO	394	}
	395
	396	int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
	397	{
	398	struct nfc_llcp_local *local;
	399	struct sk_buff *skb;
	400	u8 *service_name_tlv = NULL, service_name_tlv_length;
eda21f16	401	u8 *miux_tlv = NULL, miux_tlv_length;
06d44f80	402	u8 *rw_tlv = NULL, rw_tlv_length, rw;
d646960f	403	int err;
06d44f80	404	u16 size = 0, miux;
d646960f SO	405
	406	pr_debug("Sending CONNECT\n");
	407
	408	local = sock->local;
	409	if (local == NULL)
	410	return -ENODEV;
	411
	412	if (sock->service_name != NULL) {
	413	service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
427a2eb1 SO	414	sock->service_name,
	415	sock->service_name_len,
	416	&service_name_tlv_length);
d646960f SO	417	size += service_name_tlv_length;
	418	}
	419
06d44f80	420	/* If the socket parameters are not set, use the local ones */
5eef6669 SO	421	miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
5eef6669 SO	422	local->miux : sock->miux;
06d44f80 SO	423	rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
	424
	425	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
427a2eb1	426	&miux_tlv_length);
eda21f16 SO	427	size += miux_tlv_length;
eda21f16 SO	428
06d44f80	429	rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
eda21f16 SO	430	size += rw_tlv_length;
eda21f16 SO	431
d646960f SO	432	pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
	433
	434	skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
	435	if (skb == NULL) {
	436	err = -ENOMEM;
	437	goto error_tlv;
	438	}
	439
	440	if (service_name_tlv != NULL)
	441	skb = llcp_add_tlv(skb, service_name_tlv,
427a2eb1	442	service_name_tlv_length);
d646960f	443
eda21f16 SO	444	skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
	445	skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
	446
d646960f SO	447	skb_queue_tail(&local->tx_queue, skb);
	448
	449	return 0;
	450
	451	error_tlv:
	452	pr_err("error %d\n", err);
	453
	454	kfree(service_name_tlv);
eda21f16 SO	455	kfree(miux_tlv);
eda21f16 SO	456	kfree(rw_tlv);
d646960f SO	457
	458	return err;
	459	}
	460
	461	int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
	462	{
	463	struct nfc_llcp_local *local;
	464	struct sk_buff *skb;
eda21f16	465	u8 *miux_tlv = NULL, miux_tlv_length;
06d44f80	466	u8 *rw_tlv = NULL, rw_tlv_length, rw;
eda21f16	467	int err;
06d44f80	468	u16 size = 0, miux;
d646960f SO	469
	470	pr_debug("Sending CC\n");
	471
	472	local = sock->local;
	473	if (local == NULL)
	474	return -ENODEV;
	475
06d44f80	476	/* If the socket parameters are not set, use the local ones */
5eef6669 SO	477	miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
5eef6669 SO	478	local->miux : sock->miux;
06d44f80 SO	479	rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
	480
	481	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
427a2eb1	482	&miux_tlv_length);
eda21f16 SO	483	size += miux_tlv_length;
eda21f16 SO	484
06d44f80	485	rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
eda21f16 SO	486	size += rw_tlv_length;
	487
	488	skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
	489	if (skb == NULL) {
	490	err = -ENOMEM;
	491	goto error_tlv;
	492	}
	493
	494	skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
	495	skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
d646960f SO	496
	497	skb_queue_tail(&local->tx_queue, skb);
	498
	499	return 0;
eda21f16 SO	500
	501	error_tlv:
	502	pr_err("error %d\n", err);
	503
	504	kfree(miux_tlv);
	505	kfree(rw_tlv);
	506
	507	return err;
d646960f SO	508	}
d646960f SO	509
e0ae7bac TE	510	static struct sk_buff nfc_llcp_allocate_snl(struct nfc_llcp_local local,
e0ae7bac TE	511	size_t tlv_length)
c43bb03d SO	512	{
	513	struct sk_buff *skb;
	514	struct nfc_dev *dev;
c43bb03d SO	515	u16 size = 0;
c43bb03d SO	516
c43bb03d	517	if (local == NULL)
e0ae7bac	518	return ERR_PTR(-ENODEV);
c43bb03d SO	519
	520	dev = local->dev;
	521	if (dev == NULL)
e0ae7bac	522	return ERR_PTR(-ENODEV);
c43bb03d SO	523
	524	size += LLCP_HEADER_SIZE;
	525	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
e0ae7bac	526	size += tlv_length;
c43bb03d SO	527
c43bb03d SO	528	skb = alloc_skb(size, GFP_KERNEL);
e0ae7bac TE	529	if (skb == NULL)
e0ae7bac TE	530	return ERR_PTR(-ENOMEM);
c43bb03d SO	531
	532	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
	533
	534	skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
	535
e0ae7bac TE	536	return skb;
e0ae7bac TE	537	}
c43bb03d	538
e0ae7bac TE	539	int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
	540	struct hlist_head *tlv_list, size_t tlvs_len)
	541	{
	542	struct nfc_llcp_sdp_tlv *sdp;
	543	struct hlist_node *n;
	544	struct sk_buff *skb;
	545
	546	skb = nfc_llcp_allocate_snl(local, tlvs_len);
	547	if (IS_ERR(skb))
	548	return PTR_ERR(skb);
	549
	550	hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
	551	memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);
c43bb03d	552
e0ae7bac TE	553	hlist_del(&sdp->node);
	554
	555	nfc_llcp_free_sdp_tlv(sdp);
	556	}
	557
	558	skb_queue_tail(&local->tx_queue, skb);
c43bb03d SO	559
	560	return 0;
	561	}
	562
d9b8d8e1 TE	563	int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
	564	struct hlist_head *tlv_list, size_t tlvs_len)
	565	{
	566	struct nfc_llcp_sdp_tlv *sdreq;
	567	struct hlist_node *n;
	568	struct sk_buff *skb;
	569
	570	skb = nfc_llcp_allocate_snl(local, tlvs_len);
	571	if (IS_ERR(skb))
	572	return PTR_ERR(skb);
	573
	574	mutex_lock(&local->sdreq_lock);
	575
40213fa8 TE	576	if (hlist_empty(&local->pending_sdreqs))
	577	mod_timer(&local->sdreq_timer,
	578	jiffies + msecs_to_jiffies(3 * local->remote_lto));
	579
d9b8d8e1 TE	580	hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
	581	pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);
	582
	583	memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv,
	584	sdreq->tlv_len);
	585
	586	hlist_del(&sdreq->node);
	587
	588	hlist_add_head(&sdreq->node, &local->pending_sdreqs);
	589	}
	590
	591	mutex_unlock(&local->sdreq_lock);
	592
	593	skb_queue_tail(&local->tx_queue, skb);
	594
	595	return 0;
	596	}
	597
d646960f SO	598	int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
	599	{
	600	struct sk_buff *skb;
	601	struct nfc_dev *dev;
	602	u16 size = 1; /* Reason code */
	603
	604	pr_debug("Sending DM reason 0x%x\n", reason);
	605
	606	if (local == NULL)
	607	return -ENODEV;
	608
	609	dev = local->dev;
	610	if (dev == NULL)
	611	return -ENODEV;
	612
	613	size += LLCP_HEADER_SIZE;
	614	size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
	615
	616	skb = alloc_skb(size, GFP_KERNEL);
	617	if (skb == NULL)
	618	return -ENOMEM;
	619
	620	skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
	621
ffc29315	622	skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
d646960f SO	623
	624	memcpy(skb_put(skb, 1), &reason, 1);
	625
	626	skb_queue_head(&local->tx_queue, skb);
	627
	628	return 0;
	629	}
	630
53a0ac2e	631	int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
427a2eb1	632	struct msghdr *msg, size_t len)
53a0ac2e SO	633	{
53a0ac2e SO	634	struct sk_buff *pdu;
e65b0f46 SO	635	struct sock *sk = &sock->sk;
	636	struct nfc_llcp_local *local;
	637	size_t frag_len = 0, remaining_len;
	638	u8 msg_data, msg_ptr;
66cbfa10	639	u16 remote_miu;
53a0ac2e	640
e65b0f46	641	pr_debug("Send I frame len %zd\n", len);
53a0ac2e	642
e65b0f46 SO	643	local = sock->local;
	644	if (local == NULL)
	645	return -ENODEV;
53a0ac2e	646
dd2bf43f SO	647	/* Remote is ready but has not acknowledged our frames */
dd2bf43f SO	648	if((sock->remote_ready &&
e4306bec SO	649	skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
e4306bec SO	650	skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
dd2bf43f SO	651	pr_err("Pending queue is full %d frames\n",
	652	skb_queue_len(&sock->tx_pending_queue));
	653	return -ENOBUFS;
	654	}
	655
	656	/* Remote is not ready and we've been queueing enough frames */
	657	if ((!sock->remote_ready &&
e4306bec	658	skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
dd2bf43f SO	659	pr_err("Tx queue is full %d frames\n",
	660	skb_queue_len(&sock->tx_queue));
	661	return -ENOBUFS;
	662	}
	663
e65b0f46 SO	664	msg_data = kzalloc(len, GFP_KERNEL);
	665	if (msg_data == NULL)
	666	return -ENOMEM;
53a0ac2e	667
6ce8e9ce	668	if (memcpy_from_msg(msg_data, msg, len)) {
427a2eb1 SO	669	kfree(msg_data);
427a2eb1 SO	670	return -EFAULT;
53a0ac2e SO	671	}
53a0ac2e SO	672
e65b0f46 SO	673	remaining_len = len;
	674	msg_ptr = msg_data;
	675
0b23d666	676	do {
66cbfa10	677	remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
11bfb1c4	678	LLCP_DEFAULT_MIU : sock->remote_miu;
66cbfa10 TE	679
66cbfa10 TE	680	frag_len = min_t(size_t, remote_miu, remaining_len);
53a0ac2e	681
e65b0f46 SO	682	pr_debug("Fragment %zd bytes remaining %zd",
e65b0f46 SO	683	frag_len, remaining_len);
53a0ac2e	684
e65b0f46 SO	685	pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
e65b0f46 SO	686	frag_len + LLCP_SEQUENCE_SIZE);
43d53c29 SJ	687	if (pdu == NULL) {
43d53c29 SJ	688	kfree(msg_data);
e65b0f46	689	return -ENOMEM;
43d53c29	690	}
e65b0f46 SO	691
	692	skb_put(pdu, LLCP_SEQUENCE_SIZE);
	693
0b23d666 OG	694	if (likely(frag_len > 0))
0b23d666 OG	695	memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
e65b0f46	696
bdbc59b3	697	skb_queue_tail(&sock->tx_queue, pdu);
e65b0f46 SO	698
	699	lock_sock(sk);
	700
	701	nfc_llcp_queue_i_frames(sock);
	702
	703	release_sock(sk);
	704
	705	remaining_len -= frag_len;
b4838d12	706	msg_ptr += frag_len;
0b23d666	707	} while (remaining_len > 0);
53a0ac2e	708
e65b0f46	709	kfree(msg_data);
53a0ac2e	710
43472fff	711	return len;
53a0ac2e	712	}
d094afa1	713
94f418a2 SO	714	int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
	715	struct msghdr *msg, size_t len)
	716	{
	717	struct sk_buff *pdu;
	718	struct nfc_llcp_local *local;
	719	size_t frag_len = 0, remaining_len;
6e950fd2	720	u8 msg_ptr, msg_data;
66cbfa10	721	u16 remote_miu;
94f418a2 SO	722	int err;
	723
	724	pr_debug("Send UI frame len %zd\n", len);
	725
	726	local = sock->local;
	727	if (local == NULL)
	728	return -ENODEV;
	729
6e950fd2 SO	730	msg_data = kzalloc(len, GFP_KERNEL);
	731	if (msg_data == NULL)
	732	return -ENOMEM;
	733
6ce8e9ce	734	if (memcpy_from_msg(msg_data, msg, len)) {
6e950fd2 SO	735	kfree(msg_data);
	736	return -EFAULT;
	737	}
	738
94f418a2	739	remaining_len = len;
6e950fd2	740	msg_ptr = msg_data;
94f418a2	741
0b23d666	742	do {
66cbfa10 TE	743	remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
	744	local->remote_miu : sock->remote_miu;
	745
	746	frag_len = min_t(size_t, remote_miu, remaining_len);
94f418a2 SO	747
	748	pr_debug("Fragment %zd bytes remaining %zd",
	749	frag_len, remaining_len);
	750
	751	pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
	752	frag_len + LLCP_HEADER_SIZE, &err);
	753	if (pdu == NULL) {
	754	pr_err("Could not allocate PDU\n");
	755	continue;
	756	}
	757
	758	pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
	759
0b23d666 OG	760	if (likely(frag_len > 0))
0b23d666 OG	761	memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
94f418a2 SO	762
	763	/* No need to check for the peer RW for UI frames */
	764	skb_queue_tail(&local->tx_queue, pdu);
	765
	766	remaining_len -= frag_len;
	767	msg_ptr += frag_len;
0b23d666	768	} while (remaining_len > 0);
94f418a2	769
6e950fd2 SO	770	kfree(msg_data);
6e950fd2 SO	771
94f418a2 SO	772	return len;
	773	}
	774
d094afa1 SO	775	int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
	776	{
	777	struct sk_buff *skb;
	778	struct nfc_llcp_local *local;
	779
	780	pr_debug("Send rr nr %d\n", sock->recv_n);
	781
	782	local = sock->local;
	783	if (local == NULL)
	784	return -ENODEV;
	785
	786	skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
	787	if (skb == NULL)
	788	return -ENOMEM;
	789
	790	skb_put(skb, LLCP_SEQUENCE_SIZE);
	791
279cf174	792	skb->data[2] = sock->recv_n;
d094afa1 SO	793
	794	skb_queue_head(&local->tx_queue, skb);
	795
	796	return 0;
	797	}