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

  #include <linux/kernel.h>
  #include <linux/string.h>

  #include <linux/slab.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 <linux/uaccess.h>

  #include <asm/byteorder.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(format, args...) \
  	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)

  #else

  #define dprintk(format, args...)					\
  	do { if (0)							\
  		printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  	} while (0)
  #define dprintk_cont(format, args...)			\
  	do { if (0) printk(KERN_CONT format, ##args); } while (0)

  #endif
  
  #if 0

  #define ddprintk(format, args...) \
  	printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)

  #else

  #define ddprintk(format, args...)					\
  	do { if (0)							\
  		printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  	} while (0)
  #define ddprintk_cont(format, args...)			\
  	do { if (0) printk(KERN_CONT format, ##args); } while (0)

  #endif

  /* 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 const uint8_t *copy_macs(struct mpoa_client *mpc,
  				const uint8_t *router_mac,
  				const 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(const 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 netdev_tx_t 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) {

  		pr_info("mpoa: 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) {
  		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, "%pI4
       %-7d %-7d %-7d %-7d %-7d
       %-7d %-7d %-7d %-7d %-7d
  ",

  			   &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(&init_net, 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("(%s)
  ", mpc->dev->name);

  	if (!dev->netdev_ops)

  		pr_info("(%s) not starting
  ", dev->name);

  	else {
  		mpc->old_ops = dev->netdev_ops;
  		mpc->new_ops = *mpc->old_ops;
  		mpc->new_ops.ndo_start_xmit = mpc_send_packet;
  		dev->netdev_ops = &mpc->new_ops;

  	}

  }
  
  static void stop_mpc(struct mpoa_client *mpc)
  {

  	struct net_device *dev = mpc->dev;

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

  
  	/* Lets not nullify lec device's dev->hard_start_xmit */

  	if (dev->netdev_ops != &mpc->new_ops) {

  		dprintk_cont(" mpc already stopped, not fatal
  ");

  		return;
  	}

  	dprintk_cont("
  ");

  	dev->netdev_ops = mpc->old_ops;
  	mpc->old_ops = NULL;
  
  	/* close_shortcuts(mpc);    ??? FIXME */

  }
  
  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";

  	case MPS:
  		return "MPS";

  	case MPC:
  		return "MPC";

  	case MPS_AND_MPC:
  		return "both MPS and MPC";

  	}

  	return "unspecified (non-MPOA) device";

  }
  
  /*

   * lec device calls this via its netdev_priv(dev)->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, const u8 *mac_addr,
  			    const u8 *tlvs, u32 sizeoftlvs)

  {
  	uint32_t type;
  	uint8_t length, mpoa_device_type, number_of_mps_macs;

  	const uint8_t *end_of_tlvs;

  	struct mpoa_client *mpc;

  	mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */

  	dprintk("(%s) 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) {

  		pr_info("(%s) 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) {

  			pr_info("TLV value extends past its buffer, aborting parse
  ");

  			return;
  		}

  		if (type == 0) {

  			pr_info("mpoa: (%s) 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("(%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)) { /* :) */

  			pr_info("(%s) 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) {
  			pr_info("(%s) 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) {
  			pr_info("(%s) MPS_AND_MPC has zero MACs
  ", dev->name);

  			continue;  /* someone should read the spec */
  		}

  		dprintk_cont("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)

  		pr_info("(%s) ignoring %zd bytes of trailing TLV garbage
  ",

  			dev->name, end_of_tlvs - tlvs);

  }
  
  /*
   * 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 const uint8_t *copy_macs(struct mpoa_client *mpc,
  				const uint8_t *router_mac,
  				const 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) {

  			pr_info("(%s) out of mem
  ", mpc->dev->name);

  			return NULL;
  		}
  	}

  	ether_addr_copy(mpc->mps_macs, router_mac);

  	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("(%s) 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;
  	}

  	/* threshold not exceeded or VCC not ready */
  	if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {

  		ddprintk("(%s) cache_hit: returns != OPEN
  ",

  			 mpc->dev->name);

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

  	ddprintk("(%s) 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("(%s) 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("(%s) 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));

  	}

  	atm_account_tx(entry->shortcut, skb);

  	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 netdev_tx_t mpc_send_packet(struct sk_buff *skb,
  					 struct net_device *dev)

  {

  	struct mpoa_client *mpc;
  	struct ethhdr *eth;
  	int i = 0;

  	mpc = find_mpc_by_lec(dev); /* this should NEVER fail */

  	if (mpc == NULL) {
  		pr_info("(%s) 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 :-) */

  	/* Weed out funny packets (e.g., AF_PACKET or raw). */
  	if (skb->len < ETH_HLEN + sizeof(struct iphdr))
  		goto non_ip;
  	skb_set_network_header(skb, ETH_HLEN);
  	if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
  		goto non_ip;

  	while (i < mpc->number_of_mps_macs) {

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

  			if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
  				return NETDEV_TX_OK;

  		i++;
  	}

  non_ip:

  	return __netdev_start_xmit(mpc->old_ops, skb, dev, false);

  }
  
  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) {

  		pr_info("mpoa: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) {
  			pr_info("(%s) did not find RESOLVED entry from ingress cache
  ",

  				mpc->dev->name);

  			if (in_entry != NULL)
  				mpc->in_ops->put(in_entry);

  			return -EINVAL;
  		}

  		pr_info("(%s) attaching ingress SVC, entry = %pI4
  ",
  			mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);

  		in_entry->shortcut = vcc;
  		mpc->in_ops->put(in_entry);
  	} else {

  		pr_info("(%s) 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) {

  		pr_info("(%s) close for unknown MPC
  ", dev->name);

  		return;
  	}

  	dprintk("(%s)
  ", dev->name);

  	in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
  	if (in_entry) {

  		dprintk("(%s) ingress SVC closed ip = %pI4
  ",

  			mpc->dev->name, &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("(%s) egress SVC closed
  ", mpc->dev->name);

  		eg_entry->shortcut = NULL;
  		mpc->eg_ops->put(eg_entry);
  	}
  
  	if (in_entry == NULL && eg_entry == NULL)

  		dprintk("(%s) unused vcc closed
  ", dev->name);

  }
  
  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("(%s)
  ", dev->name);

  	if (skb == NULL) {

  		dprintk("(%s) 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("(%s) control packet arrived
  ", dev->name);

  		/* Pass control packets to daemon */
  		skb_queue_tail(&sk->sk_receive_queue, skb);

  		sk->sk_data_ready(sk);

  		return;
  	}
  
  	/* data coming over the shortcut */
  	atm_return(vcc, skb->truesize);
  
  	mpc = find_mpc_by_lec(dev);
  	if (mpc == NULL) {

  		pr_info("(%s) unknown MPC
  ", dev->name);

  		return;
  	}

  	if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
  		   sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */

  		ddprintk("(%s) tagged data packet arrived
  ", dev->name);

  	} else if (memcmp(skb->data, &llc_snap_mpoa_data,
  			  sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
  		pr_info("(%s) Unsupported non-tagged data packet arrived.  Purging
  ",
  			dev->name);

  		dev_kfree_skb_any(skb);
  		return;
  	} else {

  		pr_info("(%s) 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) {

  		pr_info("mpoa: (%s) 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;

  		pr_info("(%s) 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(new_skb), 0, sizeof(struct atm_skb_data));

  	netif_rx(new_skb);

  }

  static const 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("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) {

  		pr_info("mpoad is already present for itf %d
  ", arg);

  		return -EADDRINUSE;
  	}
  
  	if (mpc->dev) { /* check if the lec is LANE2 capable */

  		priv = netdev_priv(mpc->dev);

  		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(const 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);

  }
  
  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) {

  		pr_info("did not find MPC
  ");

  		return;
  	}
  	if (!mpc->mpoad_vcc) {

  		pr_info("close for non-present mpoad
  ");

  		return;
  	}

  	mpc->mpoad_vcc = NULL;
  	if (mpc->dev) {

  		struct lec_priv *priv = netdev_priv(mpc->dev);

  		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);
  	}

  	pr_info("(%s) going down
  ",

  		(mpc->dev) ? mpc->dev->name : "<unknown>");
  	module_put(THIS_MODULE);

  }
  
  /*
   *
   */
  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;

  	WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));

  	if (mpc == NULL) {

  		pr_info("no mpc found
  ");

  		return 0;
  	}

  	dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");

  	switch (mesg->type) {

  	case MPOA_RES_REPLY_RCVD:

  		dprintk_cont("mpoa_res_reply_rcvd
  ");

  		MPOA_res_reply_rcvd(mesg, mpc);
  		break;
  	case MPOA_TRIGGER_RCVD:

  		dprintk_cont("mpoa_trigger_rcvd
  ");

  		MPOA_trigger_rcvd(mesg, mpc);
  		break;
  	case INGRESS_PURGE_RCVD:

  		dprintk_cont("nhrp_purge_rcvd
  ");

  		ingress_purge_rcvd(mesg, mpc);
  		break;
  	case EGRESS_PURGE_RCVD:

  		dprintk_cont("egress_purge_reply_rcvd
  ");

  		egress_purge_rcvd(mesg, mpc);
  		break;
  	case MPS_DEATH:

  		dprintk_cont("mps_death
  ");

  		mps_death(mesg, mpc);
  		break;
  	case CACHE_IMPOS_RCVD:

  		dprintk_cont("cache_impos_rcvd
  ");

  		MPOA_cache_impos_rcvd(mesg, mpc);
  		break;
  	case SET_MPC_CTRL_ADDR:

  		dprintk_cont("set_mpc_ctrl_addr
  ");

  		set_mpc_ctrl_addr_rcvd(mesg, mpc);
  		break;
  	case SET_MPS_MAC_ADDR:

  		dprintk_cont("set_mps_mac_addr
  ");

  		set_mps_mac_addr_rcvd(mesg, mpc);
  		break;
  	case CLEAN_UP_AND_EXIT:

  		dprintk_cont("clean_up_and_exit
  ");

  		clean_up(mesg, mpc, DIE);
  		break;
  	case RELOAD:

  		dprintk_cont("reload
  ");

  		clean_up(mesg, mpc, RELOAD);
  		break;
  	case SET_MPC_PARAMS:

  		dprintk_cont("set_mpc_params
  ");

  		mpc->parameters = mesg->content.params;
  		break;
  	default:

  		dprintk_cont("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) {

  		pr_info("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);

  
  	return 0;
  }

  static int mpoa_event_listener(struct notifier_block *mpoa_notifier,

  			       unsigned long event, void *ptr)

  {

  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

  	struct mpoa_client *mpc;
  	struct lec_priv *priv;

  	if (!net_eq(dev_net(dev), &init_net))

  		return NOTIFY_DONE;

  	if (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 = netdev_priv(dev);

  		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("allocating new mpc for %s
  ", dev->name);

  			mpc = alloc_mpc();
  			if (mpc == NULL) {

  				pr_info("no new mpc");

  				break;
  			}
  		}
  		mpc->dev_num = priv->itfnum;
  		mpc->dev = dev;
  		dev_hold(dev);

  		dprintk("(%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("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;
  	}

  	pr_info("(%s) entry already in resolving state
  ",

  		(mpc->dev) ? mpc->dev->name : "<unknown>");
  	mpc->in_ops->put(entry);

  }
  
  /*
   * 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("(%s) using egress SVC to reach %pI4
  ",

  				client->dev->name, &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;

  		pr_info("(%s) trying to get a CBR shortcut
  ",
  			client->dev->name);
  	} else
  		memset(&msg->qos, 0, sizeof(struct atm_qos));

  	msg_to_mpoad(msg, client);

  }
  
  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("(%s) ip %pI4
  ",

  		mpc->dev->name, &dst_ip);

  	ddprintk("(%s) entry = %p",

  		 mpc->dev->name, entry);
  	if (entry == NULL) {
  		pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.
  ",
  			mpc->dev->name);

  		return;
  	}

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

  
  	if (entry->entry_state == INGRESS_RESOLVED) {

  		pr_info("(%s) 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_cont("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) {

  		pr_info("(%s) 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) {
  		pr_info("(%s) purge for a non-existing entry, ip = %pI4
  ",
  			mpc->dev->name, &dst_ip);

  		return;
  	}
  
  	do {

  		dprintk("(%s) removing an ingress entry, ip = %pI4
  ",

  			mpc->dev->name, &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);

  }

  
  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("(%s) 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);

  }

  
  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("entering
  ");

  	if (vcc == NULL) {

  		pr_info("vcc == NULL
  ");

  		return;
  	}
  
  	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
  	if (skb == NULL) {

  		pr_info("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);

  	dprintk("exiting
  ");

  }
  
  /*
   * 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("(%s)
  ", mpc->dev->name);

  	if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
  		pr_info("(%s) 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);

  }

  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("(%s) 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);

  }

  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("(%s) setting MPC ctrl ATM address to",
  		mpc->dev ? mpc->dev->name : "<unknown>");

  	for (i = 7; i < sizeof(tlv); i++)

  		dprintk_cont(" %02x", tlv[i]);
  	dprintk_cont("
  ");

  
  	if (mpc->dev) {

  		priv = netdev_priv(mpc->dev);

  		retval = priv->lane2_ops->associate_req(mpc->dev,
  							mpc->dev->dev_addr,
  							tlv, sizeof(tlv));

  		if (retval == 0)

  			pr_info("(%s) MPOA device type TLV association failed
  ",
  				mpc->dev->name);

  		retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
  		if (retval < 0)

  			pr_info("(%s) targetless LE_ARP request failed
  ",
  				mpc->dev->name);

  	}

  }

  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) {

  		pr_info("out of memory
  ");

  		return;
  	}
  	client->number_of_mps_macs = 1;

  }
  
  /*
   * 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("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);

  }
  
  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);

  }

  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();

  }

  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)

  		pr_info("failed to initialize /proc/mpoa
  ");

  	pr_info("mpc.c: 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_sync(&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 = netdev_priv(mpc->dev);

  			if (priv->lane2_ops != NULL)
  				priv->lane2_ops->associate_indicator = NULL;
  		}

  		ddprintk("about to clear caches
  ");

  		mpc->in_ops->destroy_cache(mpc);
  		mpc->eg_ops->destroy_cache(mpc);

  		ddprintk("caches cleared
  ");

  		kfree(mpc->mps_macs);
  		memset(mpc, 0, sizeof(struct mpoa_client));

  		ddprintk("about to kfree %p
  ", mpc);

  		kfree(mpc);

  		ddprintk("next mpc is at %p
  ", tmp);

  		mpc = tmp;
  	}
  
  	qos = qos_head;
  	qos_head = NULL;
  	while (qos != NULL) {
  		nextqos = qos->next;

  		dprintk("freeing qos entry %p
  ", qos);

  		kfree(qos);
  		qos = nextqos;
  	}

  }
  
  module_init(atm_mpoa_init);
  module_exit(atm_mpoa_cleanup);
  
  MODULE_LICENSE("GPL");