Linux-2.6.12-rc2v2.6.12-rc2

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

Let it rip!

1 files changed, 1514 insertions, 0 deletions

diff --git a/net/atm/mpc.c b/net/atm/mpc.c
new file mode 100644
index 000000000000..17a81ebe7e6e
--- /dev/null
+++ b/net/atm/mpc.c
@@ -0,0 +1,1514 @@
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/bitops.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/config.h>
+#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
+};
+
+#ifdef CONFIG_PROC_FS
+extern int mpc_proc_init(void);
+extern void mpc_proc_clean(void);
+#endif
+
+struct mpoa_client *mpcs = NULL; /* FIXME */
+static struct atm_mpoa_qos *qos_head = NULL;
+static struct timer_list mpc_timer = TIMER_INITIALIZER(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(uint32_t 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\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(uint32_t 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)
+{
+        unsigned char *ip;
+        char ipaddr[16];
+        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");
+
+        ipaddr[sizeof(ipaddr)-1] = '\0';
+        while (qos != NULL) {
+                ip = (unsigned char *)&qos->ipaddr;
+                sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
+                seq_printf(m, "%u.%u.%u.%u\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
+                                NIPQUAD(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 = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
+        if (mpc == NULL)
+                return NULL;
+        memset(mpc, 0, sizeof(struct mpoa_client));
+        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:\n", mpc->dev->name); 
+        if (dev->hard_start_xmit == NULL) {
+                printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
+                       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\n");
+                return;
+        }
+        dprintk("\n");
+        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\n", sizeoftlvs);
+        mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
+        if (mpc == NULL) {
+                printk("mpoa: (%s) lane2_assoc_ind: 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) {
+                        printk("TLV value extends past its buffer, aborting parse\n");
+                        return;
+                }
+                
+                if (type == 0) {
+                        printk("mpoa: (%s) lane2_assoc_ind: 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("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("\nmpoa: (%s) lane2_assoc_ind: 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) {
+                        printk("\nmpoa: (%s) lane2_assoc_ind: 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\n");
+                        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("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
+                        continue;  /* someone should read the spec */
+                }
+                dprintk("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)
+                printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
+                       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\n", 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;
+        uint32_t ipaddr = 0;
+
+        static struct {
+                struct llc_snap_hdr hdr;
+                uint32_t 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\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;
+        }
+        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\n", mpc->dev->name);        
+                mpc->in_ops->put(entry);
+                return 1;
+        }
+
+        ddprintk("mpoa: (%s) send_via_shortcut: 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("mpoa: (%s) send_via_shortcut: 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("mpoa: (%s) send_via_shortcut: 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   */
+                memcpy(skb->data, &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  */
+                memcpy(skb->data, &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\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 :-) */
+
+        while (i < mpc->number_of_mps_macs) {
+                if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
+                        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;
+        uint32_t  ipaddr;
+        unsigned char *ip;
+
+        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\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) {
+                        printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
+                                mpc->dev->name);
+                        if (in_entry != NULL) mpc->in_ops->put(in_entry);
+                        return -EINVAL;
+                }
+                ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
+                printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
+                       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
+                in_entry->shortcut = vcc;
+                mpc->in_ops->put(in_entry);
+        } else {
+                printk("mpoa: (%s) mpc_vcc_attach: 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) {
+                printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
+                return;
+        }
+
+        dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
+        in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
+        if (in_entry) {
+                unsigned char *ip __attribute__ ((unused)) =
+                    (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
+                dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
+                       mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
+                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\n", 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\n", 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;
+        uint32_t tag;
+        char *tmp;
+        
+        ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
+        if (skb == NULL) {
+                dprintk("mpoa: (%s) mpc_push: 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("mpoa: (%s) mpc_push: control packet arrived\n", 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\n", 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\n", 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\n", dev->name);
+                printk("           mpc_push: non-tagged data unsupported, purging\n");
+                dev_kfree_skb_any(skb);
+                return;
+        } else {
+                printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        tmp = skb->data + sizeof(struct llc_snap_hdr);
+        tag = *(uint32_t *)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\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;
+                printk("mpoa: (%s) mpc_push: 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 */
+        memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
+        new_skb->protocol = eth_type_trans(new_skb, dev);
+        new_skb->nh.raw = new_skb->data;
+
+        eg->latest_ip_addr = new_skb->nh.iph->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
+        /* 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\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) {
+                printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", 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\n");
+                return;
+        }
+        if (!mpc->mpoad_vcc) {
+                printk("mpoa: mpoad_close: close for non-present mpoad\n");
+                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\n",
+                (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\n");
+                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\n");
+                MPOA_res_reply_rcvd(mesg, mpc);
+                break;
+        case MPOA_TRIGGER_RCVD:
+                dprintk(" mpoa_trigger_rcvd\n");
+                MPOA_trigger_rcvd(mesg, mpc);
+                break;
+        case INGRESS_PURGE_RCVD:
+                dprintk(" nhrp_purge_rcvd\n");
+                ingress_purge_rcvd(mesg, mpc);
+                break;
+        case EGRESS_PURGE_RCVD:
+                dprintk(" egress_purge_reply_rcvd\n");
+                egress_purge_rcvd(mesg, mpc);
+                break;
+        case MPS_DEATH:
+                dprintk(" mps_death\n");
+                mps_death(mesg, mpc);
+                break;
+        case CACHE_IMPOS_RCVD:
+                dprintk(" cache_impos_rcvd\n");
+                MPOA_cache_impos_rcvd(mesg, mpc);
+                break;
+        case SET_MPC_CTRL_ADDR:
+                dprintk(" set_mpc_ctrl_addr\n");
+                set_mpc_ctrl_addr_rcvd(mesg, mpc);
+                break;
+        case SET_MPS_MAC_ADDR:
+                dprintk(" set_mps_mac_addr\n");
+                set_mps_mac_addr_rcvd(mesg, mpc);
+                break;
+        case CLEAN_UP_AND_EXIT:
+                dprintk(" clean_up_and_exit\n");
+                clean_up(mesg, mpc, DIE);
+                break;
+        case RELOAD:
+                dprintk(" reload\n");
+                clean_up(mesg, mpc, RELOAD);
+                break;
+        case SET_MPC_PARAMS:
+                dprintk(" set_mpc_params\n");
+                mpc->parameters = mesg->content.params;
+                break;
+        default:
+                dprintk(" 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) {
+                printk("mpoa: msg_to_mpoad: 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));
+        memcpy(skb->data, mesg, sizeof(struct k_message));
+        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\n",
+                               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\n", 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\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)
+{
+        uint32_t 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\n",
+                (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)
+{
+        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
+        unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&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\n",client->dev->name, NIPQUAD(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\n",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)
+{
+        unsigned char *ip;
+
+        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
+        in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
+        ip = (unsigned char *)&dst_ip;
+        dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
+        ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
+        if(entry == NULL){
+                printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
+                return;
+        }
+        ddprintk(" entry_state = %d ", entry->entry_state);     
+
+        if (entry->entry_state == INGRESS_RESOLVED) {
+                printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", 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\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) {
+                printk("mpoa: (%s) MPOA_res_reply_rcvd: 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)
+{
+        uint32_t dst_ip = msg->content.in_info.in_dst_ip;
+        uint32_t mask = msg->ip_mask;
+        unsigned char *ip = (unsigned char *)&dst_ip;
+        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\n", ip[0], ip[1], ip[2], ip[3]);
+                return;
+        }
+
+        do {
+                dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
+                        mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
+                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)
+{
+        uint32_t 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\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);
+
+        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\n");
+        if (vcc == NULL) {
+                printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
+                return;
+        }
+
+        skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
+        if (skb == NULL) {
+                 printk("mpoa: purge_egress_shortcut: 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, skb->len);
+        dprintk("mpoa: purge_egress_shortcut: exiting:\n");
+
+        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:\n", mpc->dev->name);
+
+        if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
+                printk("mpoa: (%s) mps_death: 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);
+
+        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\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);
+        
+        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("\n");
+
+        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\n", 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\n", 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 = kmalloc(ETH_ALEN,GFP_KERNEL);
+        if (client->mps_macs == NULL) {
+                printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
+                return;
+        }
+        client->number_of_mps_macs = 1;
+        memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
+        
+        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\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);
+        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);
+
+#ifdef CONFIG_PROC_FS
+        if (mpc_proc_init() != 0)
+                printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
+        else
+                printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
+#endif
+
+        printk("mpc.c: " __DATE__ " " __TIME__ " 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;
+
+#ifdef CONFIG_PROC_FS
+        mpc_proc_clean();
+#endif
+
+        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\n");
+                mpc->in_ops->destroy_cache(mpc);
+                mpc->eg_ops->destroy_cache(mpc);
+                ddprintk("mpoa: cleanup_module: caches cleared\n");
+                kfree(mpc->mps_macs);
+                memset(mpc, 0, sizeof(struct mpoa_client));
+                ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
+                kfree(mpc);
+                ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
+                mpc = tmp;
+        }
+
+        qos = qos_head;
+        qos_head = NULL;
+        while (qos != NULL) {
+                nextqos = qos->next;
+                dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
+                kfree(qos);
+                qos = nextqos;
+        }
+
+        return;
+}
+
+module_init(atm_mpoa_init);
+module_exit(atm_mpoa_cleanup);
+
+MODULE_LICENSE("GPL");