Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1437 insertions, 0 deletions

diff --git a/net/irda/irlap_frame.c b/net/irda/irlap_frame.c
new file mode 100644
index 000000000000..040abe714aa3
--- /dev/null
+++ b/net/irda/irlap_frame.c
@@ -0,0 +1,1437 @@
+/*********************************************************************
+ *
+ * Filename:      irlap_frame.c
+ * Version:       1.0
+ * Description:   Build and transmit IrLAP frames
+ * Status:        Stable
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Tue Aug 19 10:27:26 1997
+ * Modified at:   Wed Jan  5 08:59:04 2000
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ *
+ *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
+ *     All Rights Reserved.
+ *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
+ *
+ *     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.
+ *
+ *     Neither Dag Brattli nor University of Tromsø admit liability nor
+ *     provide warranty for any of this software. This material is
+ *     provided "AS-IS" and at no charge.
+ *
+ ********************************************************************/
+
+#include <linux/skbuff.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/irda.h>
+
+#include <net/pkt_sched.h>
+#include <net/sock.h>
+
+#include <asm/byteorder.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irda_device.h>
+#include <net/irda/irlap.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/timer.h>
+#include <net/irda/irlap_frame.h>
+#include <net/irda/qos.h>
+
+static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
+			       int command);
+
+/*
+ * Function irlap_insert_info (self, skb)
+ *
+ *    Insert minimum turnaround time and speed information into the skb. We
+ *    need to do this since it's per packet relevant information. Safe to
+ *    have this function inlined since it's only called from one place
+ */
+static inline void irlap_insert_info(struct irlap_cb *self,
+				     struct sk_buff *skb)
+{
+	struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb;
+
+	/*
+	 * Insert MTT (min. turn time) and speed into skb, so that the
+	 * device driver knows which settings to use
+	 */
+	cb->magic = LAP_MAGIC;
+	cb->mtt = self->mtt_required;
+	cb->next_speed = self->speed;
+
+	/* Reset */
+	self->mtt_required = 0;
+
+	/*
+	 * Delay equals negotiated BOFs count, plus the number of BOFs to
+	 * force the negotiated minimum turnaround time
+	 */
+	cb->xbofs = self->bofs_count;
+	cb->next_xbofs = self->next_bofs;
+	cb->xbofs_delay = self->xbofs_delay;
+
+	/* Reset XBOF's delay (used only for getting min turn time) */
+	self->xbofs_delay = 0;
+	/* Put the correct xbofs value for the next packet */
+	self->bofs_count = self->next_bofs;
+}
+
+/*
+ * Function irlap_queue_xmit (self, skb)
+ *
+ *    A little wrapper for dev_queue_xmit, so we can insert some common
+ *    code into it.
+ */
+void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb)
+{
+	/* Some common init stuff */
+	skb->dev = self->netdev;
+	skb->h.raw = skb->nh.raw = skb->mac.raw = skb->data;
+	skb->protocol = htons(ETH_P_IRDA);
+	skb->priority = TC_PRIO_BESTEFFORT;
+
+	irlap_insert_info(self, skb);
+
+	dev_queue_xmit(skb);
+}
+
+/*
+ * Function irlap_send_snrm_cmd (void)
+ *
+ *    Transmits a connect SNRM command frame
+ */
+void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos)
+{
+	struct sk_buff *tx_skb;
+	struct snrm_frame *frame;
+	int ret;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	/* Allocate frame */
+	tx_skb = dev_alloc_skb(64);
+	if (!tx_skb)
+		return;
+
+	frame = (struct snrm_frame *) skb_put(tx_skb, 2);
+
+	/* Insert connection address field */
+	if (qos)
+		frame->caddr = CMD_FRAME | CBROADCAST;
+	else
+		frame->caddr = CMD_FRAME | self->caddr;
+
+	/* Insert control field */
+	frame->control = SNRM_CMD | PF_BIT;
+
+	/*
+	 *  If we are establishing a connection then insert QoS paramerters
+	 */
+	if (qos) {
+		skb_put(tx_skb, 9); /* 21 left */
+		frame->saddr = cpu_to_le32(self->saddr);
+		frame->daddr = cpu_to_le32(self->daddr);
+
+		frame->ncaddr = self->caddr;
+
+		ret = irlap_insert_qos_negotiation_params(self, tx_skb);
+		if (ret < 0) {
+			dev_kfree_skb(tx_skb);
+			return;
+		}
+	}
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_recv_snrm_cmd (skb, info)
+ *
+ *    Received SNRM (Set Normal Response Mode) command frame
+ *
+ */
+static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb,
+				struct irlap_info *info)
+{
+	struct snrm_frame *frame;
+
+	if (pskb_may_pull(skb,sizeof(struct snrm_frame))) {
+		frame = (struct snrm_frame *) skb->data;
+
+		/* Copy the new connection address ignoring the C/R bit */
+		info->caddr = frame->ncaddr & 0xFE;
+
+		/* Check if the new connection address is valid */
+		if ((info->caddr == 0x00) || (info->caddr == 0xfe)) {
+			IRDA_DEBUG(3, "%s(), invalid connection address!\n",
+				   __FUNCTION__);
+			return;
+		}
+
+		/* Copy peer device address */
+		info->daddr = le32_to_cpu(frame->saddr);
+		info->saddr = le32_to_cpu(frame->daddr);
+
+		/* Only accept if addressed directly to us */
+		if (info->saddr != self->saddr) {
+			IRDA_DEBUG(2, "%s(), not addressed to us!\n",
+				   __FUNCTION__);
+			return;
+		}
+		irlap_do_event(self, RECV_SNRM_CMD, skb, info);
+	} else {
+		/* Signal that this SNRM frame does not contain and I-field */
+		irlap_do_event(self, RECV_SNRM_CMD, skb, NULL);
+	}
+}
+
+/*
+ * Function irlap_send_ua_response_frame (qos)
+ *
+ *    Send UA (Unnumbered Acknowledgement) frame
+ *
+ */
+void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos)
+{
+	struct sk_buff *tx_skb;
+	struct ua_frame *frame;
+	int ret;
+
+	IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__, jiffies);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	/* Allocate frame */
+	tx_skb = dev_alloc_skb(64);
+	if (!tx_skb)
+		return;
+
+	frame = (struct ua_frame *) skb_put(tx_skb, 10);
+
+	/* Build UA response */
+	frame->caddr = self->caddr;
+	frame->control = UA_RSP | PF_BIT;
+
+	frame->saddr = cpu_to_le32(self->saddr);
+	frame->daddr = cpu_to_le32(self->daddr);
+
+	/* Should we send QoS negotiation parameters? */
+	if (qos) {
+		ret = irlap_insert_qos_negotiation_params(self, tx_skb);
+		if (ret < 0) {
+			dev_kfree_skb(tx_skb);
+			return;
+		}
+	}
+
+	irlap_queue_xmit(self, tx_skb);
+}
+
+
+/*
+ * Function irlap_send_dm_frame (void)
+ *
+ *    Send disconnected mode (DM) frame
+ *
+ */
+void irlap_send_dm_frame( struct irlap_cb *self)
+{
+	struct sk_buff *tx_skb = NULL;
+	__u8 *frame;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	tx_skb = dev_alloc_skb(32);
+	if (!tx_skb)
+		return;
+
+	frame = skb_put(tx_skb, 2);
+
+	if (self->state == LAP_NDM)
+		frame[0] = CBROADCAST;
+	else
+		frame[0] = self->caddr;
+
+	frame[1] = DM_RSP | PF_BIT;
+
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_send_disc_frame (void)
+ *
+ *    Send disconnect (DISC) frame
+ *
+ */
+void irlap_send_disc_frame(struct irlap_cb *self)
+{
+	struct sk_buff *tx_skb = NULL;
+	__u8 *frame;
+
+	IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	tx_skb = dev_alloc_skb(16);
+	if (!tx_skb)
+		return;
+
+	frame = skb_put(tx_skb, 2);
+
+	frame[0] = self->caddr | CMD_FRAME;
+	frame[1] = DISC_CMD | PF_BIT;
+
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_send_discovery_xid_frame (S, s, command)
+ *
+ *    Build and transmit a XID (eXchange station IDentifier) discovery
+ *    frame.
+ */
+void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s,
+				    __u8 command, discovery_t *discovery)
+{
+	struct sk_buff *tx_skb = NULL;
+	struct xid_frame *frame;
+	__u32 bcast = BROADCAST;
+	__u8 *info;
+
+	IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__,
+		   s, S, command);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+	IRDA_ASSERT(discovery != NULL, return;);
+
+	tx_skb = dev_alloc_skb(64);
+	if (!tx_skb)
+		return;
+
+	skb_put(tx_skb, 14);
+	frame = (struct xid_frame *) tx_skb->data;
+
+	if (command) {
+		frame->caddr = CBROADCAST | CMD_FRAME;
+		frame->control =  XID_CMD | PF_BIT;
+	} else {
+		frame->caddr = CBROADCAST;
+		frame->control =  XID_RSP | PF_BIT;
+	}
+	frame->ident = XID_FORMAT;
+
+	frame->saddr = cpu_to_le32(self->saddr);
+
+	if (command)
+		frame->daddr = cpu_to_le32(bcast);
+	else
+		frame->daddr = cpu_to_le32(discovery->data.daddr);
+
+	switch (S) {
+	case 1:
+		frame->flags = 0x00;
+		break;
+	case 6:
+		frame->flags = 0x01;
+		break;
+	case 8:
+		frame->flags = 0x02;
+		break;
+	case 16:
+		frame->flags = 0x03;
+		break;
+	default:
+		frame->flags = 0x02;
+		break;
+	}
+
+	frame->slotnr = s;
+	frame->version = 0x00;
+
+	/*
+	 *  Provide info for final slot only in commands, and for all
+	 *  responses. Send the second byte of the hint only if the
+	 *  EXTENSION bit is set in the first byte.
+	 */
+	if (!command || (frame->slotnr == 0xff)) {
+		int len;
+
+		if (discovery->data.hints[0] & HINT_EXTENSION) {
+			info = skb_put(tx_skb, 2);
+			info[0] = discovery->data.hints[0];
+			info[1] = discovery->data.hints[1];
+		} else {
+			info = skb_put(tx_skb, 1);
+			info[0] = discovery->data.hints[0];
+		}
+		info = skb_put(tx_skb, 1);
+		info[0] = discovery->data.charset;
+
+		len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb));
+		info = skb_put(tx_skb, len);
+		memcpy(info, discovery->data.info, len);
+	}
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_recv_discovery_xid_rsp (skb, info)
+ *
+ *    Received a XID discovery response
+ *
+ */
+static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self,
+					 struct sk_buff *skb,
+					 struct irlap_info *info)
+{
+	struct xid_frame *xid;
+	discovery_t *discovery = NULL;
+	__u8 *discovery_info;
+	char *text;
+
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
+		IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
+		return;
+	}
+		
+	xid = (struct xid_frame *) skb->data;
+
+	info->daddr = le32_to_cpu(xid->saddr);
+	info->saddr = le32_to_cpu(xid->daddr);
+
+	/* Make sure frame is addressed to us */
+	if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
+		IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
+			   __FUNCTION__);
+		return;
+	}
+
+	if ((discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) {
+		IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__);
+		return;
+	}
+	memset(discovery, 0, sizeof(discovery_t));
+
+	discovery->data.daddr = info->daddr;
+	discovery->data.saddr = self->saddr;
+	discovery->timestamp = jiffies;
+
+	IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__,
+		   discovery->data.daddr);
+
+	discovery_info = skb_pull(skb, sizeof(struct xid_frame));
+
+	/* Get info returned from peer */
+	discovery->data.hints[0] = discovery_info[0];
+	if (discovery_info[0] & HINT_EXTENSION) {
+		IRDA_DEBUG(4, "EXTENSION\n");
+		discovery->data.hints[1] = discovery_info[1];
+		discovery->data.charset = discovery_info[2];
+		text = (char *) &discovery_info[3];
+	} else {
+		discovery->data.hints[1] = 0;
+		discovery->data.charset = discovery_info[1];
+		text = (char *) &discovery_info[2];
+	}
+	/*
+	 *  Terminate info string, should be safe since this is where the
+	 *  FCS bytes resides.
+	 */
+	skb->data[skb->len] = '\0';
+	strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
+	discovery->name_len = strlen(discovery->data.info);
+
+	info->discovery = discovery;
+
+	irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info);
+}
+
+/*
+ * Function irlap_recv_discovery_xid_cmd (skb, info)
+ *
+ *    Received a XID discovery command
+ *
+ */
+static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self,
+					 struct sk_buff *skb,
+					 struct irlap_info *info)
+{
+	struct xid_frame *xid;
+	discovery_t *discovery = NULL;
+	__u8 *discovery_info;
+	char *text;
+
+	if (!pskb_may_pull(skb, sizeof(struct xid_frame))) {
+		IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
+		return;
+	}
+	
+	xid = (struct xid_frame *) skb->data;
+
+	info->daddr = le32_to_cpu(xid->saddr);
+	info->saddr = le32_to_cpu(xid->daddr);
+
+	/* Make sure frame is addressed to us */
+	if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
+		IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n",
+			   __FUNCTION__);
+		return;
+	}
+
+	switch (xid->flags & 0x03) {
+	case 0x00:
+		info->S = 1;
+		break;
+	case 0x01:
+		info->S = 6;
+		break;
+	case 0x02:
+		info->S = 8;
+		break;
+	case 0x03:
+		info->S = 16;
+		break;
+	default:
+		/* Error!! */
+		return;
+	}
+	info->s = xid->slotnr;
+
+	discovery_info = skb_pull(skb, sizeof(struct xid_frame));
+
+	/*
+	 *  Check if last frame
+	 */
+	if (info->s == 0xff) {
+		/* Check if things are sane at this point... */
+		if((discovery_info == NULL) || 
+		   !pskb_may_pull(skb, 3)) {
+			IRDA_ERROR("%s: discovery frame to short!\n",
+				   __FUNCTION__);
+			return;
+		}
+
+		/*
+		 *  We now have some discovery info to deliver!
+		 */
+		discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC);
+		if (!discovery) {
+			IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__);
+			return;
+		}
+
+		discovery->data.daddr = info->daddr;
+		discovery->data.saddr = self->saddr;
+		discovery->timestamp = jiffies;
+
+		discovery->data.hints[0] = discovery_info[0];
+		if (discovery_info[0] & HINT_EXTENSION) {
+			discovery->data.hints[1] = discovery_info[1];
+			discovery->data.charset = discovery_info[2];
+			text = (char *) &discovery_info[3];
+		} else {
+			discovery->data.hints[1] = 0;
+			discovery->data.charset = discovery_info[1];
+			text = (char *) &discovery_info[2];
+		}
+		/*
+		 *  Terminate string, should be safe since this is where the
+		 *  FCS bytes resides.
+		 */
+		skb->data[skb->len] = '\0';
+		strncpy(discovery->data.info, text, NICKNAME_MAX_LEN);
+		discovery->name_len = strlen(discovery->data.info);
+
+		info->discovery = discovery;
+	} else
+		info->discovery = NULL;
+
+	irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info);
+}
+
+/*
+ * Function irlap_send_rr_frame (self, command)
+ *
+ *    Build and transmit RR (Receive Ready) frame. Notice that it is currently
+ *    only possible to send RR frames with the poll bit set.
+ */
+void irlap_send_rr_frame(struct irlap_cb *self, int command)
+{
+	struct sk_buff *tx_skb;
+	__u8 *frame;
+
+	tx_skb = dev_alloc_skb(16);
+	if (!tx_skb)
+		return;
+
+	frame = skb_put(tx_skb, 2);
+
+	frame[0] = self->caddr;
+	frame[0] |= (command) ? CMD_FRAME : 0;
+
+	frame[1] = RR | PF_BIT | (self->vr << 5);
+
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_send_rd_frame (self)
+ *
+ *    Request disconnect. Used by a secondary station to request the
+ *    disconnection of the link.
+ */
+void irlap_send_rd_frame(struct irlap_cb *self)
+{
+	struct sk_buff *tx_skb;
+	__u8 *frame;
+
+	tx_skb = dev_alloc_skb(16);
+	if (!tx_skb)
+		return;
+
+	frame = skb_put(tx_skb, 2);
+
+	frame[0] = self->caddr;
+	frame[1] = RD_RSP | PF_BIT;
+
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_recv_rr_frame (skb, info)
+ *
+ *    Received RR (Receive Ready) frame from peer station, no harm in
+ *    making it inline since its called only from one single place
+ *    (irlap_driver_rcv).
+ */
+static inline void irlap_recv_rr_frame(struct irlap_cb *self,
+				       struct sk_buff *skb,
+				       struct irlap_info *info, int command)
+{
+	info->nr = skb->data[1] >> 5;
+
+	/* Check if this is a command or a response frame */
+	if (command)
+		irlap_do_event(self, RECV_RR_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_RR_RSP, skb, info);
+}
+
+/*
+ * Function irlap_recv_rnr_frame (self, skb, info)
+ *
+ *    Received RNR (Receive Not Ready) frame from peer station
+ *
+ */
+static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb,
+				 struct irlap_info *info, int command)
+{
+	info->nr = skb->data[1] >> 5;
+
+	IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__, info->nr, jiffies);
+
+	if (command)
+		irlap_do_event(self, RECV_RNR_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_RNR_RSP, skb, info);
+}
+
+static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb,
+				 struct irlap_info *info, int command)
+{
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
+
+	info->nr = skb->data[1] >> 5;
+
+	/* Check if this is a command or a response frame */
+	if (command)
+		irlap_do_event(self, RECV_REJ_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_REJ_RSP, skb, info);
+}
+
+static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb,
+				  struct irlap_info *info, int command)
+{
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
+
+	info->nr = skb->data[1] >> 5;
+
+	/* Check if this is a command or a response frame */
+	if (command)
+		irlap_do_event(self, RECV_SREJ_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_SREJ_RSP, skb, info);
+}
+
+static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb,
+				  struct irlap_info *info, int command)
+{
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	/* Check if this is a command or a response frame */
+	if (command)
+		irlap_do_event(self, RECV_DISC_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_RD_RSP, skb, info);
+}
+
+/*
+ * Function irlap_recv_ua_frame (skb, frame)
+ *
+ *    Received UA (Unnumbered Acknowledgement) frame
+ *
+ */
+static inline void irlap_recv_ua_frame(struct irlap_cb *self,
+				       struct sk_buff *skb,
+				       struct irlap_info *info)
+{
+	irlap_do_event(self, RECV_UA_RSP, skb, info);
+}
+
+/*
+ * Function irlap_send_data_primary(self, skb)
+ *
+ *    Send I-frames as the primary station but without the poll bit set
+ *
+ */
+void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb)
+{
+	struct sk_buff *tx_skb;
+
+	if (skb->data[1] == I_FRAME) {
+
+		/*
+		 *  Insert frame sequence number (Vs) in control field before
+		 *  inserting into transmit window queue.
+		 */
+		skb->data[1] = I_FRAME | (self->vs << 1);
+
+		/*
+		 *  Insert frame in store, in case of retransmissions
+		 *  Increase skb reference count, see irlap_do_event()
+		 */
+		skb_get(skb);
+		skb_queue_tail(&self->wx_list, skb);
+
+		/* Copy buffer */
+		tx_skb = skb_clone(skb, GFP_ATOMIC);
+		if (tx_skb == NULL) {
+			return;
+		}
+
+		self->vs = (self->vs + 1) % 8;
+		self->ack_required = FALSE;
+		self->window -= 1;
+
+		irlap_send_i_frame( self, tx_skb, CMD_FRAME);
+	} else {
+		IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
+		irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
+		self->window -= 1;
+	}
+}
+/*
+ * Function irlap_send_data_primary_poll (self, skb)
+ *
+ *    Send I(nformation) frame as primary with poll bit set
+ */
+void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb)
+{
+	struct sk_buff *tx_skb;
+	int transmission_time;
+
+	/* Stop P timer */
+	del_timer(&self->poll_timer);
+
+	/* Is this reliable or unreliable data? */
+	if (skb->data[1] == I_FRAME) {
+
+		/*
+		 *  Insert frame sequence number (Vs) in control field before
+		 *  inserting into transmit window queue.
+		 */
+		skb->data[1] = I_FRAME | (self->vs << 1);
+
+		/*
+		 *  Insert frame in store, in case of retransmissions
+		 *  Increase skb reference count, see irlap_do_event()
+		 */
+		skb_get(skb);
+		skb_queue_tail(&self->wx_list, skb);
+
+		/* Copy buffer */
+		tx_skb = skb_clone(skb, GFP_ATOMIC);
+		if (tx_skb == NULL) {
+			return;
+		}
+
+		/*
+		 *  Set poll bit if necessary. We do this to the copied
+		 *  skb, since retransmitted need to set or clear the poll
+		 *  bit depending on when they are sent.
+		 */
+		tx_skb->data[1] |= PF_BIT;
+
+		self->vs = (self->vs + 1) % 8;
+		self->ack_required = FALSE;
+
+		irlap_send_i_frame(self, tx_skb, CMD_FRAME);
+	} else {
+		IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
+
+		if (self->ack_required) {
+			irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
+			irlap_send_rr_frame(self, CMD_FRAME);
+			self->ack_required = FALSE;
+		} else {
+			skb->data[1] |= PF_BIT;
+			irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
+		}
+	}
+
+	/* How much time we took for transmission of all frames.
+	 * We don't know, so let assume we used the full window. Jean II */
+	transmission_time = self->final_timeout;
+
+	/* Reset parameter so that we can fill next window */
+	self->window = self->window_size;
+
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+	/* Remove what we have not used. Just do a prorata of the
+	 * bytes left in window to window capacity.
+	 * See max_line_capacities[][] in qos.c for details. Jean II */
+	transmission_time -= (self->final_timeout * self->bytes_left
+			      / self->line_capacity);
+	IRDA_DEBUG(4, "%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n", __FUNCTION__, self->final_timeout, self->bytes_left, self->line_capacity, transmission_time);
+
+	/* We are allowed to transmit a maximum number of bytes again. */
+	self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
+
+	/*
+	 * The network layer has a intermediate buffer between IrLAP
+	 * and the IrDA driver which can contain 8 frames. So, even
+	 * though IrLAP is currently sending the *last* frame of the
+	 * tx-window, the driver most likely has only just started
+	 * sending the *first* frame of the same tx-window.
+	 * I.e. we are always at the very begining of or Tx window.
+	 * Now, we are supposed to set the final timer from the end
+	 * of our tx-window to let the other peer reply. So, we need
+	 * to add extra time to compensate for the fact that we
+	 * are really at the start of tx-window, otherwise the final timer
+	 * might expire before he can answer...
+	 * Jean II
+	 */
+	irlap_start_final_timer(self, self->final_timeout + transmission_time);
+
+	/*
+	 * The clever amongst you might ask why we do this adjustement
+	 * only here, and not in all the other cases in irlap_event.c.
+	 * In all those other case, we only send a very short management
+	 * frame (few bytes), so the adjustement would be lost in the
+	 * noise...
+	 * The exception of course is irlap_resend_rejected_frame().
+	 * Jean II */
+}
+
+/*
+ * Function irlap_send_data_secondary_final (self, skb)
+ *
+ *    Send I(nformation) frame as secondary with final bit set
+ *
+ */
+void irlap_send_data_secondary_final(struct irlap_cb *self,
+				     struct sk_buff *skb)
+{
+	struct sk_buff *tx_skb = NULL;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+	IRDA_ASSERT(skb != NULL, return;);
+
+	/* Is this reliable or unreliable data? */
+	if (skb->data[1] == I_FRAME) {
+
+		/*
+		 *  Insert frame sequence number (Vs) in control field before
+		 *  inserting into transmit window queue.
+		 */
+		skb->data[1] = I_FRAME | (self->vs << 1);
+
+		/*
+		 *  Insert frame in store, in case of retransmissions
+		 *  Increase skb reference count, see irlap_do_event()
+		 */
+		skb_get(skb);
+		skb_queue_tail(&self->wx_list, skb);
+
+		tx_skb = skb_clone(skb, GFP_ATOMIC);
+		if (tx_skb == NULL) {
+			return;
+		}
+
+		tx_skb->data[1] |= PF_BIT;
+
+		self->vs = (self->vs + 1) % 8;
+		self->ack_required = FALSE;
+
+		irlap_send_i_frame(self, tx_skb, RSP_FRAME);
+	} else {
+		if (self->ack_required) {
+			irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
+			irlap_send_rr_frame(self, RSP_FRAME);
+			self->ack_required = FALSE;
+		} else {
+			skb->data[1] |= PF_BIT;
+			irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
+		}
+	}
+
+	self->window = self->window_size;
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+	/* We are allowed to transmit a maximum number of bytes again. */
+	self->bytes_left = self->line_capacity;
+#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
+
+	irlap_start_wd_timer(self, self->wd_timeout);
+}
+
+/*
+ * Function irlap_send_data_secondary (self, skb)
+ *
+ *    Send I(nformation) frame as secondary without final bit set
+ *
+ */
+void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb)
+{
+	struct sk_buff *tx_skb = NULL;
+
+	/* Is this reliable or unreliable data? */
+	if (skb->data[1] == I_FRAME) {
+
+		/*
+		 *  Insert frame sequence number (Vs) in control field before
+		 *  inserting into transmit window queue.
+		 */
+		skb->data[1] = I_FRAME | (self->vs << 1);
+
+		/*
+		 *  Insert frame in store, in case of retransmissions
+		 *  Increase skb reference count, see irlap_do_event()
+		 */
+		skb_get(skb);
+		skb_queue_tail(&self->wx_list, skb);
+
+		tx_skb = skb_clone(skb, GFP_ATOMIC);
+		if (tx_skb == NULL) {
+			return;
+		}
+
+		self->vs = (self->vs + 1) % 8;
+		self->ack_required = FALSE;
+		self->window -= 1;
+
+		irlap_send_i_frame(self, tx_skb, RSP_FRAME);
+	} else {
+		irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
+		self->window -= 1;
+	}
+}
+
+/*
+ * Function irlap_resend_rejected_frames (nr)
+ *
+ *    Resend frames which has not been acknowledged. Should be safe to
+ *    traverse the list without locking it since this function will only be
+ *    called from interrupt context (BH)
+ */
+void irlap_resend_rejected_frames(struct irlap_cb *self, int command)
+{
+	struct sk_buff *tx_skb;
+	struct sk_buff *skb;
+	int count;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	/* Initialize variables */
+	count = skb_queue_len(&self->wx_list);
+
+	/*  Resend unacknowledged frame(s) */
+	skb = skb_peek(&self->wx_list);
+	while (skb != NULL) {
+		irlap_wait_min_turn_around(self, &self->qos_tx);
+
+		/* We copy the skb to be retransmitted since we will have to
+		 * modify it. Cloning will confuse packet sniffers
+		 */
+		/* tx_skb = skb_clone( skb, GFP_ATOMIC); */
+		tx_skb = skb_copy(skb, GFP_ATOMIC);
+		if (!tx_skb) {
+			IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
+			return;
+		}
+		/* Unlink tx_skb from list */
+		tx_skb->next = tx_skb->prev = NULL;
+		tx_skb->list = NULL;
+
+		/* Clear old Nr field + poll bit */
+		tx_skb->data[1] &= 0x0f;
+
+		/*
+		 *  Set poll bit on the last frame retransmitted
+		 */
+		if (count-- == 1)
+			tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
+		else
+			tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */
+
+		irlap_send_i_frame(self, tx_skb, command);
+
+		/*
+		 *  If our skb is the last buffer in the list, then
+		 *  we are finished, if not, move to the next sk-buffer
+		 */
+		if (skb == skb_peek_tail(&self->wx_list))
+			skb = NULL;
+		else
+			skb = skb->next;
+	}
+#if 0 /* Not yet */
+	/*
+	 *  We can now fill the window with additional data frames
+	 */
+	while (skb_queue_len( &self->txq) > 0) {
+
+		IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__);
+		if ((skb_queue_len( &self->txq) > 0) &&
+		    (self->window > 0)) {
+			skb = skb_dequeue( &self->txq);
+			IRDA_ASSERT(skb != NULL, return;);
+
+			/*
+			 *  If send window > 1 then send frame with pf
+			 *  bit cleared
+			 */
+			if ((self->window > 1) &&
+			    skb_queue_len(&self->txq) > 0)
+			{
+				irlap_send_data_primary(self, skb);
+			} else {
+				irlap_send_data_primary_poll(self, skb);
+			}
+			kfree_skb(skb);
+		}
+	}
+#endif
+}
+
+void irlap_resend_rejected_frame(struct irlap_cb *self, int command)
+{
+	struct sk_buff *tx_skb;
+	struct sk_buff *skb;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	/*  Resend unacknowledged frame(s) */
+	skb = skb_peek(&self->wx_list);
+	if (skb != NULL) {
+		irlap_wait_min_turn_around(self, &self->qos_tx);
+
+		/* We copy the skb to be retransmitted since we will have to
+		 * modify it. Cloning will confuse packet sniffers
+		 */
+		/* tx_skb = skb_clone( skb, GFP_ATOMIC); */
+		tx_skb = skb_copy(skb, GFP_ATOMIC);
+		if (!tx_skb) {
+			IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
+			return;
+		}
+		/* Unlink tx_skb from list */
+		tx_skb->next = tx_skb->prev = NULL;
+		tx_skb->list = NULL;
+
+		/* Clear old Nr field + poll bit */
+		tx_skb->data[1] &= 0x0f;
+
+		/*  Set poll/final bit */
+		tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
+
+		irlap_send_i_frame(self, tx_skb, command);
+	}
+}
+
+/*
+ * Function irlap_send_ui_frame (self, skb, command)
+ *
+ *    Contruct and transmit an Unnumbered Information (UI) frame
+ *
+ */
+void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
+			 __u8 caddr, int command)
+{
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+	IRDA_ASSERT(skb != NULL, return;);
+
+	/* Insert connection address */
+	skb->data[0] = caddr | ((command) ? CMD_FRAME : 0);
+
+	irlap_queue_xmit(self, skb);
+}
+
+/*
+ * Function irlap_send_i_frame (skb)
+ *
+ *    Contruct and transmit Information (I) frame
+ */
+static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
+			       int command)
+{
+	/* Insert connection address */
+	skb->data[0] = self->caddr;
+	skb->data[0] |= (command) ? CMD_FRAME : 0;
+
+	/* Insert next to receive (Vr) */
+	skb->data[1] |= (self->vr << 5);  /* insert nr */
+
+	irlap_queue_xmit(self, skb);
+}
+
+/*
+ * Function irlap_recv_i_frame (skb, frame)
+ *
+ *    Receive and parse an I (Information) frame, no harm in making it inline
+ *    since it's called only from one single place (irlap_driver_rcv).
+ */
+static inline void irlap_recv_i_frame(struct irlap_cb *self,
+				      struct sk_buff *skb,
+				      struct irlap_info *info, int command)
+{
+	info->nr = skb->data[1] >> 5;          /* Next to receive */
+	info->pf = skb->data[1] & PF_BIT;      /* Final bit */
+	info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */
+
+	/* Check if this is a command or a response frame */
+	if (command)
+		irlap_do_event(self, RECV_I_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_I_RSP, skb, info);
+}
+
+/*
+ * Function irlap_recv_ui_frame (self, skb, info)
+ *
+ *    Receive and parse an Unnumbered Information (UI) frame
+ *
+ */
+static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
+				struct irlap_info *info)
+{
+	IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
+
+	info->pf = skb->data[1] & PF_BIT;      /* Final bit */
+
+	irlap_do_event(self, RECV_UI_FRAME, skb, info);
+}
+
+/*
+ * Function irlap_recv_frmr_frame (skb, frame)
+ *
+ *    Received Frame Reject response.
+ *
+ */
+static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb,
+				  struct irlap_info *info)
+{
+	__u8 *frame;
+	int w, x, y, z;
+
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+	IRDA_ASSERT(skb != NULL, return;);
+	IRDA_ASSERT(info != NULL, return;);
+
+	if (!pskb_may_pull(skb, 4)) {
+		IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
+		return;
+	}
+
+	frame = skb->data;
+
+	info->nr = frame[2] >> 5;          /* Next to receive */
+	info->pf = frame[2] & PF_BIT;      /* Final bit */
+	info->ns = (frame[2] >> 1) & 0x07; /* Next to send */
+
+	w = frame[3] & 0x01;
+	x = frame[3] & 0x02;
+	y = frame[3] & 0x04;
+	z = frame[3] & 0x08;
+
+	if (w) {
+		IRDA_DEBUG(0, "Rejected control field is undefined or not "
+		      "implemented.\n");
+	}
+	if (x) {
+		IRDA_DEBUG(0, "Rejected control field was invalid because it "
+		      "contained a non permitted I field.\n");
+	}
+	if (y) {
+		IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated "
+		      "for the existing connection or exceeded the maximum "
+		      "this station supports if no connection exists.\n");
+	}
+	if (z) {
+		IRDA_DEBUG(0, "Rejected control field control field contained an "
+		      "invalid Nr count.\n");
+	}
+	irlap_do_event(self, RECV_FRMR_RSP, skb, info);
+}
+
+/*
+ * Function irlap_send_test_frame (self, daddr)
+ *
+ *    Send a test frame response
+ *
+ */
+void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr,
+			   struct sk_buff *cmd)
+{
+	struct sk_buff *tx_skb;
+	struct test_frame *frame;
+	__u8 *info;
+
+	tx_skb = dev_alloc_skb(cmd->len+sizeof(struct test_frame));
+	if (!tx_skb)
+		return;
+
+	/* Broadcast frames must include saddr and daddr fields */
+	if (caddr == CBROADCAST) {
+		frame = (struct test_frame *)
+			skb_put(tx_skb, sizeof(struct test_frame));
+
+		/* Insert the swapped addresses */
+		frame->saddr = cpu_to_le32(self->saddr);
+		frame->daddr = cpu_to_le32(daddr);
+	} else
+		frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER);
+
+	frame->caddr = caddr;
+	frame->control = TEST_RSP | PF_BIT;
+
+	/* Copy info */
+	info = skb_put(tx_skb, cmd->len);
+	memcpy(info, cmd->data, cmd->len);
+
+	/* Return to sender */
+	irlap_wait_min_turn_around(self, &self->qos_tx);
+	irlap_queue_xmit(self, tx_skb);
+}
+
+/*
+ * Function irlap_recv_test_frame (self, skb)
+ *
+ *    Receive a test frame
+ *
+ */
+static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb,
+				  struct irlap_info *info, int command)
+{
+	struct test_frame *frame;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	if (!pskb_may_pull(skb, sizeof(*frame))) {
+		IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
+		return;
+	}
+	frame = (struct test_frame *) skb->data;
+
+	/* Broadcast frames must carry saddr and daddr fields */
+	if (info->caddr == CBROADCAST) {
+		if (skb->len < sizeof(struct test_frame)) {
+			IRDA_DEBUG(0, "%s() test frame to short!\n",
+				   __FUNCTION__);
+			return;
+		}
+
+		/* Read and swap addresses */
+		info->daddr = le32_to_cpu(frame->saddr);
+		info->saddr = le32_to_cpu(frame->daddr);
+
+		/* Make sure frame is addressed to us */
+		if ((info->saddr != self->saddr) &&
+		    (info->saddr != BROADCAST)) {
+			return;
+		}
+	}
+
+	if (command)
+		irlap_do_event(self, RECV_TEST_CMD, skb, info);
+	else
+		irlap_do_event(self, RECV_TEST_RSP, skb, info);
+}
+
+/*
+ * Function irlap_driver_rcv (skb, netdev, ptype)
+ *
+ *    Called when a frame is received. Dispatches the right receive function
+ *    for processing of the frame.
+ *
+ * Note on skb management :
+ * After calling the higher layers of the IrDA stack, we always
+ * kfree() the skb, which drop the reference count (and potentially
+ * destroy it).
+ * If a higher layer of the stack want to keep the skb around (to put
+ * in a queue or pass it to the higher layer), it will need to use
+ * skb_get() to keep a reference on it. This is usually done at the
+ * LMP level in irlmp.c.
+ * Jean II
+ */
+int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev,
+		     struct packet_type *ptype)
+{
+	struct irlap_info info;
+	struct irlap_cb *self;
+	int command;
+	__u8 control;
+
+	/* FIXME: should we get our own field? */
+	self = (struct irlap_cb *) dev->atalk_ptr;
+
+	/* If the net device is down, then IrLAP is gone! */
+	if (!self || self->magic != LAP_MAGIC) {
+		dev_kfree_skb(skb);
+		return -1;
+	}
+
+	/* We are no longer an "old" protocol, so we need to handle
+	 * share and non linear skbs. This should never happen, so
+	 * we don't need to be clever about it. Jean II */
+	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
+		IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__);
+		dev_kfree_skb(skb);
+		return -1;
+	}
+
+	/* Check if frame is large enough for parsing */
+	if (!pskb_may_pull(skb, 2)) {
+		IRDA_ERROR("%s: frame to short!\n", __FUNCTION__);
+		dev_kfree_skb(skb);
+		return -1;
+	}
+
+	command    = skb->data[0] & CMD_FRAME;
+	info.caddr = skb->data[0] & CBROADCAST;
+
+	info.pf      = skb->data[1] &  PF_BIT;
+	info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */
+
+	control = info.control;
+
+	/*  First we check if this frame has a valid connection address */
+	if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) {
+		IRDA_DEBUG(0, "%s(), wrong connection address!\n",
+			   __FUNCTION__);
+		goto out;
+	}
+	/*
+	 *  Optimize for the common case and check if the frame is an
+	 *  I(nformation) frame. Only I-frames have bit 0 set to 0
+	 */
+	if (~control & 0x01) {
+		irlap_recv_i_frame(self, skb, &info, command);
+		goto out;
+	}
+	/*
+	 *  We now check is the frame is an S(upervisory) frame. Only
+	 *  S-frames have bit 0 set to 1 and bit 1 set to 0
+	 */
+	if (~control & 0x02) {
+		/*
+		 *  Received S(upervisory) frame, check which frame type it is
+		 *  only the first nibble is of interest
+		 */
+		switch (control & 0x0f) {
+		case RR:
+			irlap_recv_rr_frame(self, skb, &info, command);
+			break;
+		case RNR:
+			irlap_recv_rnr_frame(self, skb, &info, command);
+			break;
+		case REJ:
+			irlap_recv_rej_frame(self, skb, &info, command);
+			break;
+		case SREJ:
+			irlap_recv_srej_frame(self, skb, &info, command);
+			break;
+		default:
+			IRDA_WARNING("%s: Unknown S-frame %02x received!\n",
+				__FUNCTION__, info.control);
+			break;
+		}
+		goto out;
+	}
+	/*
+	 *  This must be a C(ontrol) frame
+	 */
+	switch (control) {
+	case XID_RSP:
+		irlap_recv_discovery_xid_rsp(self, skb, &info);
+		break;
+	case XID_CMD:
+		irlap_recv_discovery_xid_cmd(self, skb, &info);
+		break;
+	case SNRM_CMD:
+		irlap_recv_snrm_cmd(self, skb, &info);
+		break;
+	case DM_RSP:
+		irlap_do_event(self, RECV_DM_RSP, skb, &info);
+		break;
+	case DISC_CMD: /* And RD_RSP since they have the same value */
+		irlap_recv_disc_frame(self, skb, &info, command);
+		break;
+	case TEST_CMD:
+		irlap_recv_test_frame(self, skb, &info, command);
+		break;
+	case UA_RSP:
+		irlap_recv_ua_frame(self, skb, &info);
+		break;
+	case FRMR_RSP:
+		irlap_recv_frmr_frame(self, skb, &info);
+		break;
+	case UI_FRAME:
+		irlap_recv_ui_frame(self, skb, &info);
+		break;
+	default:
+		IRDA_WARNING("%s: Unknown frame %02x received!\n",
+				__FUNCTION__, info.control);
+		break;
+	}
+out:
+	/* Always drop our reference on the skb */
+	dev_kfree_skb(skb);
+	return 0;
+}