#include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/timer.h>
  #include <linux/init.h>
  #include <linux/bitops.h>

  #include <linux/capability.h>

  #include <linux/seq_file.h>
  
  /* We are an ethernet device */
  #include <linux/if_ether.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <net/sock.h>
  #include <linux/skbuff.h>
  #include <linux/ip.h>
  #include <asm/byteorder.h>
  #include <asm/uaccess.h>
  #include <net/checksum.h>   /* for ip_fast_csum() */
  #include <net/arp.h>
  #include <net/dst.h>
  #include <linux/proc_fs.h>
  
  /* And atm device */
  #include <linux/atmdev.h>
  #include <linux/atmlec.h>
  #include <linux/atmmpc.h>
  /* Modular too */

  #include <linux/module.h>
  
  #include "lec.h"
  #include "mpc.h"
  #include "resources.h"
  
  /*

   * mpc.c: Implementation of MPOA client kernel part

   */
  
  #if 0
  #define dprintk printk   /* debug */
  #else
  #define dprintk(format,args...)
  #endif
  
  #if 0
  #define ddprintk printk  /* more debug */
  #else
  #define ddprintk(format,args...)
  #endif
  
  
  
  #define MPOA_TAG_LEN 4
  
  /* mpc_daemon -> kernel */
  static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
  static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
  static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
  static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
  static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
  
  static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
  			  uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
  static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
  
  static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
  static void mpoad_close(struct atm_vcc *vcc);
  static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
  
  static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
  static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
  static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
  static void mpc_timer_refresh(void);
  static void mpc_cache_check( unsigned long checking_time  );
  
  static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
  	0xaa, 0xaa, 0x03,
  	{0x00, 0x00, 0x5e},
  	{0x00, 0x03}         /* For MPOA control PDUs */

  };

  static struct llc_snap_hdr llc_snap_mpoa_data = {
  	0xaa, 0xaa, 0x03,
  	{0x00, 0x00, 0x00},
  	{0x08, 0x00}         /* This is for IP PDUs only */

  };

  static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
  	0xaa, 0xaa, 0x03,
  	{0x00, 0x00, 0x00},
  	{0x88, 0x4c}         /* This is for tagged data PDUs */

  };

  
  static struct notifier_block mpoa_notifier = {
  	mpoa_event_listener,
  	NULL,
  	0
  };

  struct mpoa_client *mpcs = NULL; /* FIXME */
  static struct atm_mpoa_qos *qos_head = NULL;

  static DEFINE_TIMER(mpc_timer, NULL, 0, 0);

  
  
  static struct mpoa_client *find_mpc_by_itfnum(int itf)
  {
  	struct mpoa_client *mpc;

  	mpc = mpcs;  /* our global linked list */
  	while (mpc != NULL) {
  		if (mpc->dev_num == itf)
  			return mpc;

  		mpc = mpc->next;

  	}
  
  	return NULL;   /* not found */
  }
  
  static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
  {
  	struct mpoa_client *mpc;

  	mpc = mpcs;  /* our global linked list */
  	while (mpc != NULL) {
  		if (mpc->mpoad_vcc == vcc)
  			return mpc;
  		mpc = mpc->next;
  	}
  
  	return NULL;   /* not found */
  }
  
  static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
  {
  	struct mpoa_client *mpc;

  	mpc = mpcs;  /* our global linked list */
  	while (mpc != NULL) {
  		if (mpc->dev == dev)
  			return mpc;
  		mpc = mpc->next;
  	}
  
  	return NULL;   /* not found */
  }
  
  /*
   * Functions for managing QoS list
   */
  
  /*
   * Overwrites the old entry or makes a new one.
   */

  struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)

  {
  	struct atm_mpoa_qos *entry;
  
  	entry = atm_mpoa_search_qos(dst_ip);
  	if (entry != NULL) {
  		entry->qos = *qos;
  		return entry;
  	}
  
  	entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
  	if (entry == NULL) {
  		printk("mpoa: atm_mpoa_add_qos: out of memory
  ");
  		return entry;
  	}
  
  	entry->ipaddr = dst_ip;
  	entry->qos = *qos;
  
  	entry->next = qos_head;
  	qos_head = entry;
  
  	return entry;
  }

  struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)

  {
  	struct atm_mpoa_qos *qos;
  
  	qos = qos_head;
  	while( qos != NULL ){
  		if(qos->ipaddr == dst_ip) {
  			break;
  		}
  		qos = qos->next;
  	}
  
  	return qos;

  }

  
  /*
   * Returns 0 for failure
   */
  int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
  {
  
  	struct atm_mpoa_qos *curr;
  
  	if (entry == NULL) return 0;
  	if (entry == qos_head) {
  		qos_head = qos_head->next;
  		kfree(entry);
  		return 1;
  	}
  
  	curr = qos_head;
  	while (curr != NULL) {
  		if (curr->next == entry) {
  			curr->next = entry->next;
  			kfree(entry);
  			return 1;
  		}
  		curr = curr->next;
  	}
  
  	return 0;
  }
  
  /* this is buggered - we need locking for qos_head */
  void atm_mpoa_disp_qos(struct seq_file *m)
  {

  	struct atm_mpoa_qos *qos;
  
  	qos = qos_head;
  	seq_printf(m, "QoS entries for shortcuts:
  ");
  	seq_printf(m, "IP address
    TX:max_pcr pcr     min_pcr max_cdv max_sdu
    RX:max_pcr pcr     min_pcr max_cdv max_sdu
  ");

  	while (qos != NULL) {

  		seq_printf(m, "%u.%u.%u.%u
       %-7d %-7d %-7d %-7d %-7d
       %-7d %-7d %-7d %-7d %-7d
  ",

  				NIPQUAD(qos->ipaddr),

  				qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
  				qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
  		qos = qos->next;
  	}
  }
  
  static struct net_device *find_lec_by_itfnum(int itf)
  {
  	struct net_device *dev;
  	char name[IFNAMSIZ];
  
  	sprintf(name, "lec%d", itf);
  	dev = dev_get_by_name(name);

  	return dev;
  }
  
  static struct mpoa_client *alloc_mpc(void)
  {
  	struct mpoa_client *mpc;

  	mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);

  	if (mpc == NULL)
  		return NULL;

  	rwlock_init(&mpc->ingress_lock);
  	rwlock_init(&mpc->egress_lock);
  	mpc->next = mpcs;
  	atm_mpoa_init_cache(mpc);
  
  	mpc->parameters.mpc_p1 = MPC_P1;
  	mpc->parameters.mpc_p2 = MPC_P2;
  	memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
  	mpc->parameters.mpc_p4 = MPC_P4;

  	mpc->parameters.mpc_p5 = MPC_P5;

  	mpc->parameters.mpc_p6 = MPC_P6;

  	mpcs = mpc;

  	return mpc;
  }
  
  /*
   *
   * start_mpc() puts the MPC on line. All the packets destined

   * to the lec underneath us are now being monitored and

   * shortcuts will be established.
   *
   */
  static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
  {

  
  	dprintk("mpoa: (%s) start_mpc:
  ", mpc->dev->name);

  	if (dev->hard_start_xmit == NULL) {
  		printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting
  ",
  		       dev->name);
  		return;
  	}
  	mpc->old_hard_start_xmit = dev->hard_start_xmit;
  	dev->hard_start_xmit = mpc_send_packet;
  
  	return;
  }
  
  static void stop_mpc(struct mpoa_client *mpc)
  {

  
  	dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);

  
  	/* Lets not nullify lec device's dev->hard_start_xmit */
  	if (mpc->dev->hard_start_xmit != mpc_send_packet) {
  		dprintk(" mpc already stopped, not fatal
  ");
  		return;
  	}
  	dprintk("
  ");
  	mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
  	mpc->old_hard_start_xmit = NULL;
  	/* close_shortcuts(mpc);    ??? FIXME */

  	return;
  }
  
  static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
  
  static const char *mpoa_device_type_string(char type)
  {
  	switch(type) {
  	case NON_MPOA:
  		return "non-MPOA device";
  		break;
  	case MPS:
  		return "MPS";
  		break;
  	case MPC:
  		return "MPC";
  		break;
  	case MPS_AND_MPC:
  		return "both MPS and MPC";
  		break;
  	default:
  		return "unspecified (non-MPOA) device";
  		break;
  	}
  
  	return ""; /* not reached */
  }
  
  /*
   * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
   * when it sees a TLV in LE_ARP packet.
   * We fill in the pointer above when we see a LANE2 lec initializing
   * See LANE2 spec 3.1.5
   *
   * Quite a big and ugly function but when you look at it
   * all it does is to try to locate and parse MPOA Device
   * Type TLV.
   * We give our lec a pointer to this function and when the
   * lec sees a TLV it uses the pointer to call this function.
   *
   */
  static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
  			    uint8_t *tlvs, uint32_t sizeoftlvs)
  {
  	uint32_t type;
  	uint8_t length, mpoa_device_type, number_of_mps_macs;
  	uint8_t *end_of_tlvs;
  	struct mpoa_client *mpc;

  	mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
  	dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
  	dprintk("total length of all TLVs %d
  ", sizeoftlvs);
  	mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
  	if (mpc == NULL) {
  		printk("mpoa: (%s) lane2_assoc_ind: no mpc
  ", dev->name);
  		return;
  	}
  	end_of_tlvs = tlvs + sizeoftlvs;
  	while (end_of_tlvs - tlvs >= 5) {
  		type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
  		length = tlvs[4];
  		tlvs += 5;
  		dprintk("    type 0x%x length %02x
  ", type, length);
  		if (tlvs + length > end_of_tlvs) {
  			printk("TLV value extends past its buffer, aborting parse
  ");
  			return;
  		}

  		if (type == 0) {
  			printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning
  ", dev->name);
  			return;
  		}
  
  		if (type != TLV_MPOA_DEVICE_TYPE) {
  			tlvs += length;
  			continue;  /* skip other TLVs */
  		}
  		mpoa_device_type = *tlvs++;
  		number_of_mps_macs = *tlvs++;
  		dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
  		if (mpoa_device_type == MPS_AND_MPC &&
  		    length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
  			printk("
  mpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV
  ",
  			       dev->name);
  			continue;
  		}
  		if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
  		    && length < 22 + number_of_mps_macs*ETH_ALEN) {
  			printk("
  mpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV
  ",
  				dev->name);
  			continue;
  		}
  		if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
  			dprintk("ignoring non-MPS device
  ");
  			if (mpoa_device_type == MPC) tlvs += 20;
  			continue;  /* we are only interested in MPSs */
  		}
  		if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
  			printk("
  mpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs
  ", dev->name);
  			continue;  /* someone should read the spec */
  		}
  		dprintk("this MPS has %d MAC addresses
  ", number_of_mps_macs);

  		/* ok, now we can go and tell our daemon the control address of MPS */
  		send_set_mps_ctrl_addr(tlvs, mpc);

  		tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
  		if (tlvs == NULL) return;
  	}
  	if (end_of_tlvs - tlvs != 0)
  		printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage
  ",
  		       dev->name, end_of_tlvs - tlvs);
  	return;
  }
  
  /*
   * Store at least advertizing router's MAC address
   * plus the possible MAC address(es) to mpc->mps_macs.
   * For a freshly allocated MPOA client mpc->mps_macs == 0.
   */
  static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
  			  uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
  {
  	int num_macs;
  	num_macs = (mps_macs > 1) ? mps_macs : 1;
  
  	if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
  		if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
  		mpc->number_of_mps_macs = 0;
  		mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
  		if (mpc->mps_macs == NULL) {
  			printk("mpoa: (%s) copy_macs: out of mem
  ", mpc->dev->name);
  			return NULL;
  		}
  	}
  	memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
  	tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
  	if (mps_macs > 0)
  		memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
  	tlvs += mps_macs*ETH_ALEN;
  	mpc->number_of_mps_macs = num_macs;
  
  	return tlvs;
  }
  
  static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
  {
  	in_cache_entry *entry;
  	struct iphdr *iph;
  	char *buff;

  	__be32 ipaddr = 0;

  
  	static struct {
  		struct llc_snap_hdr hdr;

  		__be32 tag;

  	} tagged_llc_snap_hdr = {
  		{0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
  		0
  	};
  
  	buff = skb->data + mpc->dev->hard_header_len;
  	iph = (struct iphdr *)buff;
  	ipaddr = iph->daddr;

  	ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x
  ", mpc->dev->name, ipaddr);

  
  	entry = mpc->in_ops->get(ipaddr, mpc);
  	if (entry == NULL) {
  		entry = mpc->in_ops->add_entry(ipaddr, mpc);
  		if (entry != NULL) mpc->in_ops->put(entry);
  		return 1;
  	}
  	if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){   /* threshold not exceeded or VCC not ready */

  		ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN
  ", mpc->dev->name);

  		mpc->in_ops->put(entry);
  		return 1;
  	}

  	ddprintk("mpoa: (%s) send_via_shortcut: using shortcut
  ", mpc->dev->name);

  	/* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
  	if (iph->ttl <= 1) {

  		ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE
  ", mpc->dev->name, iph->ttl);

  		mpc->in_ops->put(entry);
  		return 1;
  	}
  	iph->ttl--;
  	iph->check = 0;
  	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
  
  	if (entry->ctrl_info.tag != 0) {
  		ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x
  ", mpc->dev->name, entry->ctrl_info.tag);
  		tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
  		skb_pull(skb, ETH_HLEN);                       /* get rid of Eth header */
  		skb_push(skb, sizeof(tagged_llc_snap_hdr));    /* add LLC/SNAP header   */

  		skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
  					sizeof(tagged_llc_snap_hdr));

  	} else {
  		skb_pull(skb, ETH_HLEN);                        /* get rid of Eth header */
  		skb_push(skb, sizeof(struct llc_snap_hdr));     /* add LLC/SNAP header + tag  */

  		skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
  					sizeof(struct llc_snap_hdr));

  	}
  
  	atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
  	ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
  	entry->shortcut->send(entry->shortcut, skb);
  	entry->packets_fwded++;
  	mpc->in_ops->put(entry);
  
  	return 0;
  }
  
  /*
   * Probably needs some error checks and locking, not sure...
   */
  static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
  {
  	int retval;
  	struct mpoa_client *mpc;
  	struct ethhdr *eth;
  	int i = 0;

  	mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
  	if(mpc == NULL) {
  		printk("mpoa: (%s) mpc_send_packet: no MPC found
  ", dev->name);
  		goto non_ip;
  	}
  
  	eth = (struct ethhdr *)skb->data;
  	if (eth->h_proto != htons(ETH_P_IP))
  		goto non_ip; /* Multi-Protocol Over ATM :-) */
  
  	while (i < mpc->number_of_mps_macs) {

  		if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))

  			if ( send_via_shortcut(skb, mpc) == 0 )           /* try shortcut */
  				return 0;                                 /* success!     */
  		i++;
  	}
  
   non_ip:
  	retval = mpc->old_hard_start_xmit(skb,dev);

  	return retval;
  }
  
  static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
  {
  	int bytes_left;
  	struct mpoa_client *mpc;
  	struct atmmpc_ioc ioc_data;
  	in_cache_entry *in_entry;

  	__be32  ipaddr;

  
  	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
  	if (bytes_left != 0) {
  		printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland
  ", bytes_left);
  		return -EFAULT;
  	}
  	ipaddr = ioc_data.ipaddr;
  	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
  		return -EINVAL;

  	mpc = find_mpc_by_itfnum(ioc_data.dev_num);
  	if (mpc == NULL)
  		return -EINVAL;

  	if (ioc_data.type == MPC_SOCKET_INGRESS) {
  		in_entry = mpc->in_ops->get(ipaddr, mpc);
  		if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
  			printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache
  ",
  				mpc->dev->name);
  			if (in_entry != NULL) mpc->in_ops->put(in_entry);
  			return -EINVAL;
  		}

  		printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u
  ",

  		       mpc->dev->name, NIPQUAD(in_entry->ctrl_info.in_dst_ip));

  		in_entry->shortcut = vcc;
  		mpc->in_ops->put(in_entry);
  	} else {
  		printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC
  ", mpc->dev->name);
  	}
  
  	vcc->proto_data = mpc->dev;
  	vcc->push = mpc_push;
  
  	return 0;
  }
  
  /*
   *
   */
  static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
  {
  	struct mpoa_client *mpc;
  	in_cache_entry *in_entry;
  	eg_cache_entry *eg_entry;

  	mpc = find_mpc_by_lec(dev);
  	if (mpc == NULL) {
  		printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC
  ", dev->name);
  		return;
  	}
  
  	dprintk("mpoa: (%s) mpc_vcc_close:
  ", dev->name);
  	in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
  	if (in_entry) {

  		dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u
  ",

  		       mpc->dev->name, NIPQUAD(in_entry->ctrl_info.in_dst_ip));

  		in_entry->shortcut = NULL;
  		mpc->in_ops->put(in_entry);
  	}
  	eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
  	if (eg_entry) {
  		dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed
  ", mpc->dev->name);
  		eg_entry->shortcut = NULL;
  		mpc->eg_ops->put(eg_entry);
  	}
  
  	if (in_entry == NULL && eg_entry == NULL)
  		dprintk("mpoa: (%s) mpc_vcc_close:  unused vcc closed
  ", dev->name);
  
  	return;
  }
  
  static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
  {
  	struct net_device *dev = (struct net_device *)vcc->proto_data;
  	struct sk_buff *new_skb;
  	eg_cache_entry *eg;
  	struct mpoa_client *mpc;

  	__be32 tag;

  	char *tmp;

  	ddprintk("mpoa: (%s) mpc_push:
  ", dev->name);
  	if (skb == NULL) {
  		dprintk("mpoa: (%s) mpc_push: null skb, closing VCC
  ", dev->name);
  		mpc_vcc_close(vcc, dev);
  		return;
  	}

  	skb->dev = dev;
  	if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
  		struct sock *sk = sk_atm(vcc);
  
  		dprintk("mpoa: (%s) mpc_push: control packet arrived
  ", dev->name);
  		/* Pass control packets to daemon */
  		skb_queue_tail(&sk->sk_receive_queue, skb);
  		sk->sk_data_ready(sk, skb->len);
  		return;
  	}
  
  	/* data coming over the shortcut */
  	atm_return(vcc, skb->truesize);
  
  	mpc = find_mpc_by_lec(dev);
  	if (mpc == NULL) {
  		printk("mpoa: (%s) mpc_push: unknown MPC
  ", dev->name);
  		return;
  	}
  
  	if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
  		ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived
  ", dev->name);
  
  	} else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
  		printk("mpoa: (%s) mpc_push: non-tagged data packet arrived
  ", dev->name);
  		printk("           mpc_push: non-tagged data unsupported, purging
  ");
  		dev_kfree_skb_any(skb);
  		return;
  	} else {
  		printk("mpoa: (%s) mpc_push: garbage arrived, purging
  ", dev->name);
  		dev_kfree_skb_any(skb);
  		return;
  	}
  
  	tmp = skb->data + sizeof(struct llc_snap_hdr);

  	tag = *(__be32 *)tmp;

  
  	eg = mpc->eg_ops->get_by_tag(tag, mpc);
  	if (eg == NULL) {
  		printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u
  ",
  		       dev->name,tag);
  		purge_egress_shortcut(vcc, NULL);
  		dev_kfree_skb_any(skb);
  		return;
  	}

  	/*
  	 * See if ingress MPC is using shortcut we opened as a return channel.
  	 * This means we have a bi-directional vcc opened by us.

  	 */

  	if (eg->shortcut == NULL) {
  		eg->shortcut = vcc;
  		printk("mpoa: (%s) mpc_push: egress SVC in use
  ", dev->name);
  	}
  
  	skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
  	new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
  	dev_kfree_skb_any(skb);
  	if (new_skb == NULL){
  		mpc->eg_ops->put(eg);
  		return;
  	}
  	skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */

  	skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
  				eg->ctrl_info.DH_length);

  	new_skb->protocol = eth_type_trans(new_skb, dev);

  	skb_reset_network_header(new_skb);

  	eg->latest_ip_addr = ip_hdr(new_skb)->saddr;

  	eg->packets_rcvd++;
  	mpc->eg_ops->put(eg);
  
  	memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
  	netif_rx(new_skb);
  
  	return;
  }
  
  static struct atmdev_ops mpc_ops = { /* only send is required */
  	.close	= mpoad_close,
  	.send	= msg_from_mpoad
  };
  
  static struct atm_dev mpc_dev = {
  	.ops	= &mpc_ops,
  	.type	= "mpc",
  	.number	= 42,

  	.lock	= __SPIN_LOCK_UNLOCKED(mpc_dev.lock)

  	/* members not explicitly initialised will be 0 */
  };
  
  static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
  {
  	struct mpoa_client *mpc;
  	struct lec_priv *priv;
  	int err;

  	if (mpcs == NULL) {
  		init_timer(&mpc_timer);
  		mpc_timer_refresh();
  
  		/* This lets us now how our LECs are doing */
  		err = register_netdevice_notifier(&mpoa_notifier);
  		if (err < 0) {
  			del_timer(&mpc_timer);
  			return err;
  		}
  	}

  	mpc = find_mpc_by_itfnum(arg);
  	if (mpc == NULL) {
  		dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d
  ", arg);
  		mpc = alloc_mpc();
  		if (mpc == NULL)
  			return -ENOMEM;
  		mpc->dev_num = arg;
  		mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
  	}
  	if (mpc->mpoad_vcc) {
  		printk("mpoa: mpoad_attach: mpoad is already present for itf %d
  ", arg);
  		return -EADDRINUSE;
  	}
  
  	if (mpc->dev) { /* check if the lec is LANE2 capable */
  		priv = (struct lec_priv *)mpc->dev->priv;
  		if (priv->lane_version < 2) {
  			dev_put(mpc->dev);
  			mpc->dev = NULL;
  		} else

  			priv->lane2_ops->associate_indicator = lane2_assoc_ind;

  	}
  
  	mpc->mpoad_vcc = vcc;
  	vcc->dev = &mpc_dev;
  	vcc_insert_socket(sk_atm(vcc));
  	set_bit(ATM_VF_META,&vcc->flags);
  	set_bit(ATM_VF_READY,&vcc->flags);
  
  	if (mpc->dev) {
  		char empty[ATM_ESA_LEN];
  		memset(empty, 0, ATM_ESA_LEN);

  		start_mpc(mpc, mpc->dev);
  		/* set address if mpcd e.g. gets killed and restarted.
  		 * If we do not do it now we have to wait for the next LE_ARP
  		 */
  		if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
  			send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
  	}
  
  	__module_get(THIS_MODULE);
  	return arg;
  }
  
  static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
  {
  	struct k_message mesg;
  
  	memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);

  	mesg.type = SET_MPS_CTRL_ADDR;
  	memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
  	msg_to_mpoad(&mesg, mpc);
  
  	return;
  }
  
  static void mpoad_close(struct atm_vcc *vcc)
  {
  	struct mpoa_client *mpc;
  	struct sk_buff *skb;
  
  	mpc = find_mpc_by_vcc(vcc);
  	if (mpc == NULL) {
  		printk("mpoa: mpoad_close: did not find MPC
  ");
  		return;
  	}
  	if (!mpc->mpoad_vcc) {
  		printk("mpoa: mpoad_close: close for non-present mpoad
  ");
  		return;
  	}

  	mpc->mpoad_vcc = NULL;
  	if (mpc->dev) {
  		struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
  		priv->lane2_ops->associate_indicator = NULL;
  		stop_mpc(mpc);
  		dev_put(mpc->dev);
  	}
  
  	mpc->in_ops->destroy_cache(mpc);
  	mpc->eg_ops->destroy_cache(mpc);
  
  	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
  		atm_return(vcc, skb->truesize);
  		kfree_skb(skb);
  	}

  	printk("mpoa: (%s) going down
  ",
  		(mpc->dev) ? mpc->dev->name : "<unknown>");
  	module_put(THIS_MODULE);
  
  	return;
  }
  
  /*
   *
   */
  static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
  {

  	struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
  	struct k_message *mesg = (struct k_message*)skb->data;
  	atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);

  	if (mpc == NULL) {
  		printk("mpoa: msg_from_mpoad: no mpc found
  ");
  		return 0;
  	}
  	dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
  	switch(mesg->type) {
  	case MPOA_RES_REPLY_RCVD:
  		dprintk(" mpoa_res_reply_rcvd
  ");
  		MPOA_res_reply_rcvd(mesg, mpc);
  		break;
  	case MPOA_TRIGGER_RCVD:
  		dprintk(" mpoa_trigger_rcvd
  ");
  		MPOA_trigger_rcvd(mesg, mpc);
  		break;
  	case INGRESS_PURGE_RCVD:
  		dprintk(" nhrp_purge_rcvd
  ");
  		ingress_purge_rcvd(mesg, mpc);
  		break;
  	case EGRESS_PURGE_RCVD:
  		dprintk(" egress_purge_reply_rcvd
  ");
  		egress_purge_rcvd(mesg, mpc);
  		break;
  	case MPS_DEATH:
  		dprintk(" mps_death
  ");
  		mps_death(mesg, mpc);
  		break;
  	case CACHE_IMPOS_RCVD:
  		dprintk(" cache_impos_rcvd
  ");
  		MPOA_cache_impos_rcvd(mesg, mpc);
  		break;
  	case SET_MPC_CTRL_ADDR:
  		dprintk(" set_mpc_ctrl_addr
  ");
  		set_mpc_ctrl_addr_rcvd(mesg, mpc);
  		break;
  	case SET_MPS_MAC_ADDR:
  		dprintk(" set_mps_mac_addr
  ");
  		set_mps_mac_addr_rcvd(mesg, mpc);
  		break;
  	case CLEAN_UP_AND_EXIT:
  		dprintk(" clean_up_and_exit
  ");
  		clean_up(mesg, mpc, DIE);
  		break;
  	case RELOAD:
  		dprintk(" reload
  ");
  		clean_up(mesg, mpc, RELOAD);
  		break;
  	case SET_MPC_PARAMS:
  		dprintk(" set_mpc_params
  ");
  		mpc->parameters = mesg->content.params;
  		break;
  	default:
  		dprintk(" unknown message %d
  ", mesg->type);
  		break;
  	}
  	kfree_skb(skb);
  
  	return 0;
  }
  
  /* Remember that this function may not do things that sleep */
  int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
  {
  	struct sk_buff *skb;
  	struct sock *sk;
  
  	if (mpc == NULL || !mpc->mpoad_vcc) {
  		printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad
  ", mesg->type);
  		return -ENXIO;
  	}
  
  	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
  	if (skb == NULL)
  		return -ENOMEM;
  	skb_put(skb, sizeof(struct k_message));

  	skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));

  	atm_force_charge(mpc->mpoad_vcc, skb->truesize);

  	sk = sk_atm(mpc->mpoad_vcc);
  	skb_queue_tail(&sk->sk_receive_queue, skb);
  	sk->sk_data_ready(sk, skb->len);
  
  	return 0;
  }
  
  static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
  {
  	struct net_device *dev;
  	struct mpoa_client *mpc;
  	struct lec_priv *priv;
  
  	dev = (struct net_device *)dev_ptr;
  	if (dev->name == NULL || strncmp(dev->name, "lec", 3))
  		return NOTIFY_DONE; /* we are only interested in lec:s */

  	switch (event) {
  	case NETDEV_REGISTER:       /* a new lec device was allocated */
  		priv = (struct lec_priv *)dev->priv;
  		if (priv->lane_version < 2)
  			break;
  		priv->lane2_ops->associate_indicator = lane2_assoc_ind;
  		mpc = find_mpc_by_itfnum(priv->itfnum);
  		if (mpc == NULL) {
  			dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s
  ",
  			       dev->name);
  			mpc = alloc_mpc();
  			if (mpc == NULL) {
  				printk("mpoa: mpoa_event_listener: no new mpc");
  				break;
  			}
  		}
  		mpc->dev_num = priv->itfnum;
  		mpc->dev = dev;
  		dev_hold(dev);
  		dprintk("mpoa: (%s) was initialized
  ", dev->name);
  		break;
  	case NETDEV_UNREGISTER:
  		/* the lec device was deallocated */
  		mpc = find_mpc_by_lec(dev);
  		if (mpc == NULL)
  			break;
  		dprintk("mpoa: device (%s) was deallocated
  ", dev->name);
  		stop_mpc(mpc);
  		dev_put(mpc->dev);
  		mpc->dev = NULL;
  		break;
  	case NETDEV_UP:
  		/* the dev was ifconfig'ed up */
  		mpc = find_mpc_by_lec(dev);
  		if (mpc == NULL)
  			break;
  		if (mpc->mpoad_vcc != NULL) {
  			start_mpc(mpc, dev);
  		}
  		break;
  	case NETDEV_DOWN:
  		/* the dev was ifconfig'ed down */
  		/* this means that the flow of packets from the
  		 * upper layer stops
  		 */
  		mpc = find_mpc_by_lec(dev);
  		if (mpc == NULL)
  			break;
  		if (mpc->mpoad_vcc != NULL) {
  			stop_mpc(mpc);
  		}
  		break;
  	case NETDEV_REBOOT:
  	case NETDEV_CHANGE:
  	case NETDEV_CHANGEMTU:
  	case NETDEV_CHANGEADDR:
  	case NETDEV_GOING_DOWN:
  		break;
  	default:
  		break;
  	}
  
  	return NOTIFY_DONE;
  }
  
  /*
   * Functions which are called after a message is received from mpcd.
   * Msg is reused on purpose.
   */
  
  
  static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
  {

  	__be32 dst_ip = msg->content.in_info.in_dst_ip;

  	in_cache_entry *entry;
  
  	entry = mpc->in_ops->get(dst_ip, mpc);
  	if(entry == NULL){
  		entry = mpc->in_ops->add_entry(dst_ip, mpc);
  		entry->entry_state = INGRESS_RESOLVING;
  		msg->type = SND_MPOA_RES_RQST;
  		msg->content.in_info = entry->ctrl_info;
  		msg_to_mpoad(msg, mpc);
  		do_gettimeofday(&(entry->reply_wait));
  		mpc->in_ops->put(entry);
  		return;
  	}

  	if(entry->entry_state == INGRESS_INVALID){
  		entry->entry_state = INGRESS_RESOLVING;
  		msg->type = SND_MPOA_RES_RQST;
  		msg->content.in_info = entry->ctrl_info;
  		msg_to_mpoad(msg, mpc);
  		do_gettimeofday(&(entry->reply_wait));
  		mpc->in_ops->put(entry);
  		return;
  	}

  	printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state
  ",
  		(mpc->dev) ? mpc->dev->name : "<unknown>");
  	mpc->in_ops->put(entry);
  	return;
  }
  
  /*
   * Things get complicated because we have to check if there's an egress

   * shortcut with suitable traffic parameters we could use.

   */
  static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
  {

  	__be32 dst_ip = msg->content.in_info.in_dst_ip;

  	struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
  	eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
  
  	if(eg_entry && eg_entry->shortcut){
  		if(eg_entry->shortcut->qos.txtp.traffic_class &
  		   msg->qos.txtp.traffic_class &
  		   (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
  			    if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
  				    entry->shortcut = eg_entry->shortcut;
  			    else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
  				    entry->shortcut = eg_entry->shortcut;
  		}

  		if(entry->shortcut){

  			dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u
  ",client->dev->name, NIPQUAD(dst_ip));

  			client->eg_ops->put(eg_entry);
  			return;
  		}
  	}
  	if (eg_entry != NULL)
  		client->eg_ops->put(eg_entry);
  
  	/* No luck in the egress cache we must open an ingress SVC */
  	msg->type = OPEN_INGRESS_SVC;
  	if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
  	{
  		msg->qos = qos->qos;
  		printk("mpoa: (%s) trying to get a CBR shortcut
  ",client->dev->name);

  	}

  	else memset(&msg->qos,0,sizeof(struct atm_qos));
  	msg_to_mpoad(msg, client);
  	return;
  }
  
  static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
  {

  	__be32 dst_ip = msg->content.in_info.in_dst_ip;

  	in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);

  	dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u
  ", mpc->dev->name, NIPQUAD(dst_ip));

  	ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
  	if(entry == NULL){
  		printk("
  mpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.
  ", mpc->dev->name);
  		return;
  	}

  	ddprintk(" entry_state = %d ", entry->entry_state);

  
  	if (entry->entry_state == INGRESS_RESOLVED) {
  		printk("
  mpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!
  ", mpc->dev->name);
  		mpc->in_ops->put(entry);
  		return;
  	}
  
  	entry->ctrl_info = msg->content.in_info;
  	do_gettimeofday(&(entry->tv));
  	do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
  	entry->refresh_time = 0;
  	ddprintk("entry->shortcut = %p
  ", entry->shortcut);
  
  	if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){

  		entry->entry_state = INGRESS_RESOLVED;

  		mpc->in_ops->put(entry);
  		return; /* Shortcut already open... */
  	}
  
  	if (entry->shortcut != NULL) {
  		printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!
  ",
  		       mpc->dev->name);
  		mpc->in_ops->put(entry);
  		return;
  	}

  	check_qos_and_open_shortcut(msg, mpc, entry);
  	entry->entry_state = INGRESS_RESOLVED;
  	mpc->in_ops->put(entry);
  
  	return;
  
  }
  
  static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
  {

  	__be32 dst_ip = msg->content.in_info.in_dst_ip;
  	__be32 mask = msg->ip_mask;

  	in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
  
  	if(entry == NULL){
  		printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);

  		printk("ip = %u.%u.%u.%u
  ", NIPQUAD(dst_ip));

  		return;
  	}
  
  	do {
  		dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u
  " ,

  			mpc->dev->name, NIPQUAD(dst_ip));

  		write_lock_bh(&mpc->ingress_lock);
  		mpc->in_ops->remove_entry(entry, mpc);
  		write_unlock_bh(&mpc->ingress_lock);
  		mpc->in_ops->put(entry);
  		entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
  	} while (entry != NULL);
  
  	return;

  }

  
  static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
  {

  	__be32 cache_id = msg->content.eg_info.cache_id;

  	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);

  	if (entry == NULL) {
  		dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry
  ", mpc->dev->name);
  		return;
  	}
  
  	write_lock_irq(&mpc->egress_lock);
  	mpc->eg_ops->remove_entry(entry, mpc);
  	write_unlock_irq(&mpc->egress_lock);
  
  	mpc->eg_ops->put(entry);
  
  	return;

  }

  
  static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
  {
  	struct sock *sk;
  	struct k_message *purge_msg;
  	struct sk_buff *skb;
  
  	dprintk("mpoa: purge_egress_shortcut: entering
  ");
  	if (vcc == NULL) {
  		printk("mpoa: purge_egress_shortcut: vcc == NULL
  ");
  		return;
  	}
  
  	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
  	if (skb == NULL) {
  		 printk("mpoa: purge_egress_shortcut: out of memory
  ");
  		return;
  	}
  
  	skb_put(skb, sizeof(struct k_message));
  	memset(skb->data, 0, sizeof(struct k_message));
  	purge_msg = (struct k_message *)skb->data;
  	purge_msg->type = DATA_PLANE_PURGE;
  	if (entry != NULL)
  		purge_msg->content.eg_info = entry->ctrl_info;
  
  	atm_force_charge(vcc, skb->truesize);
  
  	sk = sk_atm(vcc);
  	skb_queue_tail(&sk->sk_receive_queue, skb);
  	sk->sk_data_ready(sk, skb->len);
  	dprintk("mpoa: purge_egress_shortcut: exiting:
  ");
  
  	return;
  }
  
  /*
   * Our MPS died. Tell our daemon to send NHRP data plane purge to each
   * of the egress shortcuts we have.
   */
  static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
  {
  	eg_cache_entry *entry;
  
  	dprintk("mpoa: (%s) mps_death:
  ", mpc->dev->name);
  
  	if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
  		printk("mpoa: (%s) mps_death: wrong MPS
  ", mpc->dev->name);
  		return;
  	}
  
  	/* FIXME: This knows too much of the cache structure */
  	read_lock_irq(&mpc->egress_lock);
  	entry = mpc->eg_cache;
  	while (entry != NULL) {
  		purge_egress_shortcut(entry->shortcut, entry);
  		entry = entry->next;
  	}
  	read_unlock_irq(&mpc->egress_lock);
  
  	mpc->in_ops->destroy_cache(mpc);
  	mpc->eg_ops->destroy_cache(mpc);
  
  	return;
  }
  
  static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
  {
  	uint16_t holding_time;
  	eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);

  	holding_time = msg->content.eg_info.holding_time;
  	dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u
  ",
  	       mpc->dev->name, entry, holding_time);
  	if(entry == NULL && holding_time) {
  		entry = mpc->eg_ops->add_entry(msg, mpc);
  		mpc->eg_ops->put(entry);
  		return;
  	}
  	if(holding_time){
  		mpc->eg_ops->update(entry, holding_time);
  		return;
  	}

  	write_lock_irq(&mpc->egress_lock);
  	mpc->eg_ops->remove_entry(entry, mpc);
  	write_unlock_irq(&mpc->egress_lock);
  
  	mpc->eg_ops->put(entry);

  	return;
  }
  
  static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
  {
  	struct lec_priv *priv;
  	int i, retval ;
  
  	uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
  
  	tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
  	tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
  	tlv[5] = 0x02;                 /* MPOA client                      */
  	tlv[6] = 0x00;                 /* number of MPS MAC addresses      */
  
  	memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
  	memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
  
  	dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
  	       (mpc->dev) ? mpc->dev->name : "<unknown>");
  	for (i = 7; i < sizeof(tlv); i++)
  		dprintk("%02x ", tlv[i]);
  	dprintk("
  ");
  
  	if (mpc->dev) {
  		priv = (struct lec_priv *)mpc->dev->priv;
  		retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
  		if (retval == 0)
  			printk("mpoa: (%s) MPOA device type TLV association failed
  ", mpc->dev->name);
  		retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
  		if (retval < 0)
  			printk("mpoa: (%s) targetless LE_ARP request failed
  ", mpc->dev->name);
  	}
  
  	return;
  }
  
  static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
  {
  
  	if(client->number_of_mps_macs)
  		kfree(client->mps_macs);
  	client->number_of_mps_macs = 0;

  	client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);

  	if (client->mps_macs == NULL) {
  		printk("mpoa: set_mps_mac_addr_rcvd: out of memory
  ");
  		return;
  	}
  	client->number_of_mps_macs = 1;

  	return;
  }
  
  /*
   * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
   */
  static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
  {
  
  	eg_cache_entry *entry;
  	msg->type = SND_EGRESS_PURGE;
  
  
  	/* FIXME: This knows too much of the cache structure */
  	read_lock_irq(&mpc->egress_lock);
  	entry = mpc->eg_cache;
  	while (entry != NULL){
  		    msg->content.eg_info = entry->ctrl_info;
  		    dprintk("mpoa: cache_id %u
  ", entry->ctrl_info.cache_id);
  		    msg_to_mpoad(msg, mpc);
  		    entry = entry->next;
  	}
  	read_unlock_irq(&mpc->egress_lock);
  
  	msg->type = action;
  	msg_to_mpoad(msg, mpc);
  	return;
  }
  
  static void mpc_timer_refresh(void)
  {
  	mpc_timer.expires = jiffies + (MPC_P2 * HZ);
  	mpc_timer.data = mpc_timer.expires;
  	mpc_timer.function = mpc_cache_check;
  	add_timer(&mpc_timer);

  	return;
  }
  
  static void mpc_cache_check( unsigned long checking_time  )
  {
  	struct mpoa_client *mpc = mpcs;
  	static unsigned long previous_resolving_check_time;
  	static unsigned long previous_refresh_time;

  	while( mpc != NULL ){
  		mpc->in_ops->clear_count(mpc);
  		mpc->eg_ops->clear_expired(mpc);
  		if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
  			mpc->in_ops->check_resolving(mpc);
  			previous_resolving_check_time = checking_time;
  		}
  		if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
  			mpc->in_ops->refresh(mpc);
  			previous_refresh_time = checking_time;
  		}
  		mpc = mpc->next;
  	}
  	mpc_timer_refresh();

  	return;
  }
  
  static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  {
  	int err = 0;
  	struct atm_vcc *vcc = ATM_SD(sock);
  
  	if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
  		return -ENOIOCTLCMD;
  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	switch (cmd) {
  		case ATMMPC_CTRL:
  			err = atm_mpoa_mpoad_attach(vcc, (int)arg);
  			if (err >= 0)
  				sock->state = SS_CONNECTED;
  			break;
  		case ATMMPC_DATA:
  			err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
  			break;
  		default:
  			break;
  	}
  	return err;
  }
  
  
  static struct atm_ioctl atm_ioctl_ops = {
  	.owner	= THIS_MODULE,
  	.ioctl	= atm_mpoa_ioctl,
  };
  
  static __init int atm_mpoa_init(void)
  {
  	register_atm_ioctl(&atm_ioctl_ops);

  	if (mpc_proc_init() != 0)
  		printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa
  ");

  
  	printk("mpc.c: " __DATE__ " " __TIME__ " initialized
  ");
  
  	return 0;
  }
  
  static void __exit atm_mpoa_cleanup(void)
  {
  	struct mpoa_client *mpc, *tmp;
  	struct atm_mpoa_qos *qos, *nextqos;
  	struct lec_priv *priv;

  	mpc_proc_clean();

  
  	del_timer(&mpc_timer);
  	unregister_netdevice_notifier(&mpoa_notifier);
  	deregister_atm_ioctl(&atm_ioctl_ops);
  
  	mpc = mpcs;
  	mpcs = NULL;
  	while (mpc != NULL) {
  		tmp = mpc->next;
  		if (mpc->dev != NULL) {
  			stop_mpc(mpc);
  			priv = (struct lec_priv *)mpc->dev->priv;
  			if (priv->lane2_ops != NULL)
  				priv->lane2_ops->associate_indicator = NULL;
  		}
  		ddprintk("mpoa: cleanup_module: about to clear caches
  ");
  		mpc->in_ops->destroy_cache(mpc);
  		mpc->eg_ops->destroy_cache(mpc);
  		ddprintk("mpoa: cleanup_module: caches cleared
  ");
  		kfree(mpc->mps_macs);
  		memset(mpc, 0, sizeof(struct mpoa_client));
  		ddprintk("mpoa: cleanup_module: about to kfree %p
  ", mpc);
  		kfree(mpc);
  		ddprintk("mpoa: cleanup_module: next mpc is at %p
  ", tmp);
  		mpc = tmp;
  	}
  
  	qos = qos_head;
  	qos_head = NULL;
  	while (qos != NULL) {
  		nextqos = qos->next;
  		dprintk("mpoa: cleanup_module: freeing qos entry %p
  ", qos);
  		kfree(qos);
  		qos = nextqos;
  	}
  
  	return;
  }
  
  module_init(atm_mpoa_init);
  module_exit(atm_mpoa_cleanup);
  
  MODULE_LICENSE("GPL");