Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1535 insertions, 0 deletions

diff --git a/net/atm/mpc.c b/net/atm/mpc.c
new file mode 100644
index 000000000..033871e71
--- /dev/null
+++ b/net/atm/mpc.c
@@ -0,0 +1,1535 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#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(struct timer_list *unused);
+
+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, mpc_cache_check);
+
+
+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\n");
+		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:\n");
+	seq_printf(m, "IP address\n  TX:max_pcr pcr     min_pcr max_cdv max_sdu\n  RX:max_pcr pcr     min_pcr max_cdv max_sdu\n");
+
+	while (qos != NULL) {
+		seq_printf(m, "%pI4\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
+			   &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)\n", mpc->dev->name);
+	if (!dev->netdev_ops)
+		pr_info("(%s) not starting\n", 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\n");
+		return;
+	}
+	dprintk_cont("\n");
+
+	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\n", sizeoftlvs);
+	mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
+	if (mpc == NULL) {
+		pr_info("(%s) no mpc\n", 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\n", type, length);
+		if (tlvs + length > end_of_tlvs) {
+			pr_info("TLV value extends past its buffer, aborting parse\n");
+			return;
+		}
+
+		if (type == 0) {
+			pr_info("mpoa: (%s) TLV type was 0, returning\n",
+				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\n",
+				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\n", 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\n", dev->name);
+			continue;  /* someone should read the spec */
+		}
+		dprintk_cont("this MPS has %d MAC addresses\n",
+			     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\n",
+			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_array(ETH_ALEN, num_macs, GFP_KERNEL);
+		if (mpc->mps_macs == NULL) {
+			pr_info("(%s) out of mem\n", 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\n",
+		 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\n",
+			 mpc->dev->name);
+		mpc->in_ops->put(entry);
+		return 1;
+	}
+
+	ddprintk("(%s) using shortcut\n",
+		 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\n",
+			 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\n",
+			 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\n", 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\n",
+			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\n",
+				mpc->dev->name);
+			if (in_entry != NULL)
+				mpc->in_ops->put(in_entry);
+			return -EINVAL;
+		}
+		pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
+			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\n", 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\n", dev->name);
+		return;
+	}
+
+	dprintk("(%s)\n", dev->name);
+	in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
+	if (in_entry) {
+		dprintk("(%s) ingress SVC closed ip = %pI4\n",
+			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\n", 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\n", 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)\n", dev->name);
+	if (skb == NULL) {
+		dprintk("(%s) null skb, closing VCC\n", 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\n", 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\n", 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\n", 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\n",
+			dev->name);
+		dev_kfree_skb_any(skb);
+		return;
+	} else {
+		pr_info("(%s) garbage arrived, purging\n", 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\n",
+			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\n", 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) {
+		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\n", 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\n", 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\n");
+		return;
+	}
+	if (!mpc->mpoad_vcc) {
+		pr_info("close for non-present mpoad\n");
+		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\n",
+		(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\n");
+		return 0;
+	}
+	dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
+	switch (mesg->type) {
+	case MPOA_RES_REPLY_RCVD:
+		dprintk_cont("mpoa_res_reply_rcvd\n");
+		MPOA_res_reply_rcvd(mesg, mpc);
+		break;
+	case MPOA_TRIGGER_RCVD:
+		dprintk_cont("mpoa_trigger_rcvd\n");
+		MPOA_trigger_rcvd(mesg, mpc);
+		break;
+	case INGRESS_PURGE_RCVD:
+		dprintk_cont("nhrp_purge_rcvd\n");
+		ingress_purge_rcvd(mesg, mpc);
+		break;
+	case EGRESS_PURGE_RCVD:
+		dprintk_cont("egress_purge_reply_rcvd\n");
+		egress_purge_rcvd(mesg, mpc);
+		break;
+	case MPS_DEATH:
+		dprintk_cont("mps_death\n");
+		mps_death(mesg, mpc);
+		break;
+	case CACHE_IMPOS_RCVD:
+		dprintk_cont("cache_impos_rcvd\n");
+		MPOA_cache_impos_rcvd(mesg, mpc);
+		break;
+	case SET_MPC_CTRL_ADDR:
+		dprintk_cont("set_mpc_ctrl_addr\n");
+		set_mpc_ctrl_addr_rcvd(mesg, mpc);
+		break;
+	case SET_MPS_MAC_ADDR:
+		dprintk_cont("set_mps_mac_addr\n");
+		set_mps_mac_addr_rcvd(mesg, mpc);
+		break;
+	case CLEAN_UP_AND_EXIT:
+		dprintk_cont("clean_up_and_exit\n");
+		clean_up(mesg, mpc, DIE);
+		break;
+	case RELOAD:
+		dprintk_cont("reload\n");
+		clean_up(mesg, mpc, RELOAD);
+		break;
+	case SET_MPC_PARAMS:
+		dprintk_cont("set_mpc_params\n");
+		mpc->parameters = mesg->content.params;
+		break;
+	default:
+		dprintk_cont("unknown message %d\n", 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\n", 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\n", 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\n", 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\n", 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);
+		entry->reply_wait = ktime_get_seconds();
+		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);
+		entry->reply_wait = ktime_get_seconds();
+		mpc->in_ops->put(entry);
+		return;
+	}
+
+	pr_info("(%s) entry already in resolving state\n",
+		(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\n",
+				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\n",
+			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\n",
+		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.\n",
+			mpc->dev->name);
+		return;
+	}
+	ddprintk_cont(" entry_state = %d ", entry->entry_state);
+
+	if (entry->entry_state == INGRESS_RESOLVED) {
+		pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
+		mpc->in_ops->put(entry);
+		return;
+	}
+
+	entry->ctrl_info = msg->content.in_info;
+	entry->time = ktime_get_seconds();
+	/* Used in refreshing func from now on */
+	entry->reply_wait = ktime_get_seconds();
+	entry->refresh_time = 0;
+	ddprintk_cont("entry->shortcut = %p\n", 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!\n",
+			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\n",
+			mpc->dev->name, &dst_ip);
+		return;
+	}
+
+	do {
+		dprintk("(%s) removing an ingress entry, ip = %pI4\n",
+			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\n",
+			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\n");
+	if (vcc == NULL) {
+		pr_info("vcc == NULL\n");
+		return;
+	}
+
+	skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
+	if (skb == NULL) {
+		pr_info("out of memory\n");
+		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\n");
+}
+
+/*
+ * 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)\n", mpc->dev->name);
+
+	if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
+		pr_info("(%s) wrong MPS\n", 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\n",
+		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("\n");
+
+	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\n",
+				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\n",
+				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\n");
+		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\n", 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 unsigned long checking_time;
+
+static void mpc_timer_refresh(void)
+{
+	mpc_timer.expires = jiffies + (MPC_P2 * HZ);
+	checking_time = mpc_timer.expires;
+	add_timer(&mpc_timer);
+}
+
+static void mpc_cache_check(struct timer_list *unused)
+{
+	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\n");
+
+	pr_info("mpc.c: initialized\n");
+
+	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\n");
+		mpc->in_ops->destroy_cache(mpc);
+		mpc->eg_ops->destroy_cache(mpc);
+		ddprintk("caches cleared\n");
+		kfree(mpc->mps_macs);
+		memset(mpc, 0, sizeof(struct mpoa_client));
+		ddprintk("about to kfree %p\n", mpc);
+		kfree(mpc);
+		ddprintk("next mpc is at %p\n", tmp);
+		mpc = tmp;
+	}
+
+	qos = qos_head;
+	qos_head = NULL;
+	while (qos != NULL) {
+		nextqos = qos->next;
+		dprintk("freeing qos entry %p\n", qos);
+		kfree(qos);
+		qos = nextqos;
+	}
+}
+
+module_init(atm_mpoa_init);
+module_exit(atm_mpoa_cleanup);
+
+MODULE_LICENSE("GPL");