/*
 * lec.c: Lan Emulation driver
 *
 * Marko Kiiskila <mkiiskila@yahoo.com>
 */

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

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/capability.h>

/* We are 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 <linux/uaccess.h>
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>

/* And atm device */
#include <linux/atmdev.h>
#include <linux/atmlec.h>

/* Proxy LEC knows about bridging */
#if IS_ENABLED(CONFIG_BRIDGE)
#include "../bridge/br_private.h"

static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
#endif

/* Modular too */
#include <linux/module.h>
#include <linux/init.h>

/* Hardening for Spectre-v1 */
#include <linux/nospec.h>

#include "lec.h"
#include "lec_arpc.h"
#include "resources.h"

#define DUMP_PACKETS 0          /*
                                 * 0 = None,
                                 * 1 = 30 first bytes
                                 * 2 = Whole packet
                                 */

#define LEC_UNRES_QUE_LEN 8     /*
                                 * number of tx packets to queue for a
                                 * single destination while waiting for SVC
                                 */

static int lec_open(struct net_device *dev);
static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
                                  struct net_device *dev);
static int lec_close(struct net_device *dev);
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
                                          const unsigned char *mac_addr);
static int lec_arp_remove(struct lec_priv *priv,
                          struct lec_arp_table *to_remove);
/* LANE2 functions */
static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
                                const u8 *tlvs, u32 sizeoftlvs);
static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
                         u8 **tlvs, u32 *sizeoftlvs);
static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
                               const u8 *tlvs, u32 sizeoftlvs);

static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
                           unsigned long permanent);
static void lec_arp_check_empties(struct lec_priv *priv,
                                  struct atm_vcc *vcc, struct sk_buff *skb);
static void lec_arp_destroy(struct lec_priv *priv);
static void lec_arp_init(struct lec_priv *priv);
static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
                                       const unsigned char *mac_to_find,
                                       int is_rdesc,
                                       struct lec_arp_table **ret_entry);
static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
                           const unsigned char *atm_addr,
                           unsigned long remoteflag,
                           unsigned int targetless_le_arp);
static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
static void lec_set_flush_tran_id(struct lec_priv *priv,
                                  const unsigned char *atm_addr,
                                  unsigned long tran_id);
static void lec_vcc_added(struct lec_priv *priv,
                          const struct atmlec_ioc *ioc_data,
                          struct atm_vcc *vcc,
                          void (*old_push)(struct atm_vcc *vcc,
                                           struct sk_buff *skb));
static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);

/* must be done under lec_arp_lock */
static inline void lec_arp_hold(struct lec_arp_table *entry)
{
        refcount_inc(&entry->usage);
}

static inline void lec_arp_put(struct lec_arp_table *entry)
{
        if (refcount_dec_and_test(&entry->usage))
                kfree(entry);
}

static struct lane2_ops lane2_ops = {
        .resolve = lane2_resolve,               /* spec 3.1.3 */
        .associate_req = lane2_associate_req,   /* spec 3.1.4 */
        .associate_indicator = NULL             /* spec 3.1.5 */
};

static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

/* Device structures */
static struct net_device *dev_lec[MAX_LEC_ITF];

#if IS_ENABLED(CONFIG_BRIDGE)
static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
{
        char *buff;
        struct lec_priv *priv;

        /*
         * Check if this is a BPDU. If so, ask zeppelin to send
         * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
         * as the Config BPDU has
         */
        buff = skb->data + skb->dev->hard_header_len;
        if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
                struct sock *sk;
                struct sk_buff *skb2;
                struct atmlec_msg *mesg;

                skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
                if (skb2 == NULL)
                        return;
                skb2->len = sizeof(struct atmlec_msg);
                mesg = (struct atmlec_msg *)skb2->data;
                mesg->type = l_topology_change;
                buff += 4;
                mesg->content.normal.flag = *buff & 0x01;
                                        /* 0x01 is topology change */

                priv = netdev_priv(dev);
                atm_force_charge(priv->lecd, skb2->truesize);
                sk = sk_atm(priv->lecd);
                skb_queue_tail(&sk->sk_receive_queue, skb2);
                sk->sk_data_ready(sk);
        }
}
#endif /* IS_ENABLED(CONFIG_BRIDGE) */

/*
 * Open/initialize the netdevice. This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */

static int lec_open(struct net_device *dev)
{
        netif_start_queue(dev);

        return 0;
}

static void
lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
        struct net_device *dev = skb->dev;

        ATM_SKB(skb)->vcc = vcc;
        atm_account_tx(vcc, skb);

        if (vcc->send(vcc, skb) < 0) {
                dev->stats.tx_dropped++;
                return;
        }

        dev->stats.tx_packets++;
        dev->stats.tx_bytes += skb->len;
}

static void lec_tx_timeout(struct net_device *dev)
{
        pr_info("%s\n", dev->name);
        netif_trans_update(dev);
        netif_wake_queue(dev);
}

static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
                                  struct net_device *dev)
{
        struct sk_buff *skb2;
        struct lec_priv *priv = netdev_priv(dev);
        struct lecdatahdr_8023 *lec_h;
        struct atm_vcc *vcc;
        struct lec_arp_table *entry;
        unsigned char *dst;
        int min_frame_size;
        int is_rdesc;

        pr_debug("called\n");
        if (!priv->lecd) {
                pr_info("%s:No lecd attached\n", dev->name);
                dev->stats.tx_errors++;
                netif_stop_queue(dev);
                kfree_skb(skb);
                return NETDEV_TX_OK;
        }

        pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
                 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
                 (long)skb_end_pointer(skb));
#if IS_ENABLED(CONFIG_BRIDGE)
        if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
                lec_handle_bridge(skb, dev);
#endif

        /* Make sure we have room for lec_id */
        if (skb_headroom(skb) < 2) {
                pr_debug("reallocating skb\n");
                skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
                if (unlikely(!skb2)) {
                        kfree_skb(skb);
                        return NETDEV_TX_OK;
                }
                consume_skb(skb);
                skb = skb2;
        }
        skb_push(skb, 2);

        /* Put le header to place */
        lec_h = (struct lecdatahdr_8023 *)skb->data;
        lec_h->le_header = htons(priv->lecid);

#if DUMP_PACKETS >= 2
#define MAX_DUMP_SKB 99
#elif DUMP_PACKETS >= 1
#define MAX_DUMP_SKB 30
#endif
#if DUMP_PACKETS >= 1
        printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
               dev->name, skb->len, priv->lecid);
        print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
                       skb->data, min(skb->len, MAX_DUMP_SKB), true);
#endif /* DUMP_PACKETS >= 1 */

        /* Minimum ethernet-frame size */
        min_frame_size = LEC_MINIMUM_8023_SIZE;
        if (skb->len < min_frame_size) {
                if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
                        skb2 = skb_copy_expand(skb, 0,
                                               min_frame_size - skb->truesize,
                                               GFP_ATOMIC);
                        dev_kfree_skb(skb);
                        if (skb2 == NULL) {
                                dev->stats.tx_dropped++;
                                return NETDEV_TX_OK;
                        }
                        skb = skb2;
                }
                skb_put(skb, min_frame_size - skb->len);
        }

        /* Send to right vcc */
        is_rdesc = 0;
        dst = lec_h->h_dest;
        entry = NULL;
        vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
        pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
                 dev->name, vcc, vcc ? vcc->flags : 0, entry);
        if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
                if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
                        pr_debug("%s:queuing packet, MAC address %pM\n",
                                 dev->name, lec_h->h_dest);
                        skb_queue_tail(&entry->tx_wait, skb);
                } else {
                        pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
                                 dev->name, lec_h->h_dest);
                        dev->stats.tx_dropped++;
                        dev_kfree_skb(skb);
                }
                goto out;
        }
#if DUMP_PACKETS > 0
        printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
               dev->name, vcc->vpi, vcc->vci);
#endif /* DUMP_PACKETS > 0 */

        while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
                pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
                lec_send(vcc, skb2);
        }

        lec_send(vcc, skb);

        if (!atm_may_send(vcc, 0)) {
                struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);

                vpriv->xoff = 1;
                netif_stop_queue(dev);

                /*
                 * vcc->pop() might have occurred in between, making
                 * the vcc usuable again.  Since xmit is serialized,
                 * this is the only situation we have to re-test.
                 */

                if (atm_may_send(vcc, 0))
                        netif_wake_queue(dev);
        }

out:
        if (entry)
                lec_arp_put(entry);
        netif_trans_update(dev);
        return NETDEV_TX_OK;
}

/* The inverse routine to net_open(). */
static int lec_close(struct net_device *dev)
{
        netif_stop_queue(dev);
        return 0;
}

static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
        unsigned long flags;
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct lec_priv *priv = netdev_priv(dev);
        struct atmlec_msg *mesg;
        struct lec_arp_table *entry;
        int i;
        char *tmp;              /* FIXME */

        WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
        mesg = (struct atmlec_msg *)skb->data;
        tmp = skb->data;
        tmp += sizeof(struct atmlec_msg);
        pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
        switch (mesg->type) {
        case l_set_mac_addr:
                for (i = 0; i < 6; i++)
                        dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
                break;
        case l_del_mac_addr:
                for (i = 0; i < 6; i++)
                        dev->dev_addr[i] = 0;
                break;
        case l_addr_delete:
                lec_addr_delete(priv, mesg->content.normal.atm_addr,
                                mesg->content.normal.flag);
                break;
        case l_topology_change:
                priv->topology_change = mesg->content.normal.flag;
                break;
        case l_flush_complete:
                lec_flush_complete(priv, mesg->content.normal.flag);
                break;
        case l_narp_req:        /* LANE2: see 7.1.35 in the lane2 spec */
                spin_lock_irqsave(&priv->lec_arp_lock, flags);
                entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
                lec_arp_remove(priv, entry);
                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);

                if (mesg->content.normal.no_source_le_narp)
                        break;
                /* FALL THROUGH */
        case l_arp_update:
                lec_arp_update(priv, mesg->content.normal.mac_addr,
                               mesg->content.normal.atm_addr,
                               mesg->content.normal.flag,
                               mesg->content.normal.targetless_le_arp);
                pr_debug("in l_arp_update\n");
                if (mesg->sizeoftlvs != 0) {    /* LANE2 3.1.5 */
                        pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
                                 mesg->sizeoftlvs);
                        lane2_associate_ind(dev, mesg->content.normal.mac_addr,
                                            tmp, mesg->sizeoftlvs);
                }
                break;
        case l_config:
                priv->maximum_unknown_frame_count =
                    mesg->content.config.maximum_unknown_frame_count;
                priv->max_unknown_frame_time =
                    (mesg->content.config.max_unknown_frame_time * HZ);
                priv->max_retry_count = mesg->content.config.max_retry_count;
                priv->aging_time = (mesg->content.config.aging_time * HZ);
                priv->forward_delay_time =
                    (mesg->content.config.forward_delay_time * HZ);
                priv->arp_response_time =
                    (mesg->content.config.arp_response_time * HZ);
                priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
                priv->path_switching_delay =
                    (mesg->content.config.path_switching_delay * HZ);
                priv->lane_version = mesg->content.config.lane_version;
                                        /* LANE2 */
                priv->lane2_ops = NULL;
                if (priv->lane_version > 1)
                        priv->lane2_ops = &lane2_ops;
                rtnl_lock();
                if (dev_set_mtu(dev, mesg->content.config.mtu))
                        pr_info("%s: change_mtu to %d failed\n",
                                dev->name, mesg->content.config.mtu);
                rtnl_unlock();
                priv->is_proxy = mesg->content.config.is_proxy;
                break;
        case l_flush_tran_id:
                lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
                                      mesg->content.normal.flag);
                break;
        case l_set_lecid:
                priv->lecid =
                    (unsigned short)(0xffff & mesg->content.normal.flag);
                break;
        case l_should_bridge:
#if IS_ENABLED(CONFIG_BRIDGE)
        {
                pr_debug("%s: bridge zeppelin asks about %pM\n",
                         dev->name, mesg->content.proxy.mac_addr);

                if (br_fdb_test_addr_hook == NULL)
                        break;

                if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
                        /* hit from bridge table, send LE_ARP_RESPONSE */
                        struct sk_buff *skb2;
                        struct sock *sk;

                        pr_debug("%s: entry found, responding to zeppelin\n",
                                 dev->name);
                        skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
                        if (skb2 == NULL)
                                break;
                        skb2->len = sizeof(struct atmlec_msg);
                        skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
                        atm_force_charge(priv->lecd, skb2->truesize);
                        sk = sk_atm(priv->lecd);
                        skb_queue_tail(&sk->sk_receive_queue, skb2);
                        sk->sk_data_ready(sk);
                }
        }
#endif /* IS_ENABLED(CONFIG_BRIDGE) */
                break;
        default:
                pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
                dev_kfree_skb(skb);
                return -EINVAL;
        }
        dev_kfree_skb(skb);
        return 0;
}

static void lec_atm_close(struct atm_vcc *vcc)
{
        struct sk_buff *skb;
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct lec_priv *priv = netdev_priv(dev);

        priv->lecd = NULL;
        /* Do something needful? */

        netif_stop_queue(dev);
        lec_arp_destroy(priv);

        if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
                pr_info("%s closing with messages pending\n", dev->name);
        while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
                atm_return(vcc, skb->truesize);
                dev_kfree_skb(skb);
        }

        pr_info("%s: Shut down!\n", dev->name);
        module_put(THIS_MODULE);
}

static const struct atmdev_ops lecdev_ops = {
        .close = lec_atm_close,
        .send = lec_atm_send
};

static struct atm_dev lecatm_dev = {
        .ops = &lecdev_ops,
        .type = "lec",
        .number = 999,          /* dummy device number */
        .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
};

/*
 * LANE2: new argument struct sk_buff *data contains
 * the LE_ARP based TLVs introduced in the LANE2 spec
 */
static int
send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
             const unsigned char *mac_addr, const unsigned char *atm_addr,
             struct sk_buff *data)
{
        struct sock *sk;
        struct sk_buff *skb;
        struct atmlec_msg *mesg;

        if (!priv || !priv->lecd)
                return -1;
        skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
        if (!skb)
                return -1;
        skb->len = sizeof(struct atmlec_msg);
        mesg = (struct atmlec_msg *)skb->data;
        memset(mesg, 0, sizeof(struct atmlec_msg));
        mesg->type = type;
        if (data != NULL)
                mesg->sizeoftlvs = data->len;
        if (mac_addr)
                ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
        else
                mesg->content.normal.targetless_le_arp = 1;
        if (atm_addr)
                memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);

        atm_force_charge(priv->lecd, skb->truesize);
        sk = sk_atm(priv->lecd);
        skb_queue_tail(&sk->sk_receive_queue, skb);
        sk->sk_data_ready(sk);

        if (data != NULL) {
                pr_debug("about to send %d bytes of data\n", data->len);
                atm_force_charge(priv->lecd, data->truesize);
                skb_queue_tail(&sk->sk_receive_queue, data);
                sk->sk_data_ready(sk);
        }

        return 0;
}

static void lec_set_multicast_list(struct net_device *dev)
{
        /*
         * by default, all multicast frames arrive over the bus.
         * eventually support selective multicast service
         */
}

static const struct net_device_ops lec_netdev_ops = {
        .ndo_open               = lec_open,
        .ndo_stop               = lec_close,
        .ndo_start_xmit         = lec_start_xmit,
        .ndo_tx_timeout         = lec_tx_timeout,
        .ndo_set_rx_mode        = lec_set_multicast_list,
};

static const unsigned char lec_ctrl_magic[] = {
        0xff,
        0x00,
        0x01,
        0x01
};

#define LEC_DATA_DIRECT_8023  2
#define LEC_DATA_DIRECT_8025  3

static int lec_is_data_direct(struct atm_vcc *vcc)
{
        return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
                (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
}

static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
        unsigned long flags;
        struct net_device *dev = (struct net_device *)vcc->proto_data;
        struct lec_priv *priv = netdev_priv(dev);

#if DUMP_PACKETS > 0
        printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
               dev->name, vcc->vpi, vcc->vci);
#endif
        if (!skb) {
                pr_debug("%s: null skb\n", dev->name);
                lec_vcc_close(priv, vcc);
                return;
        }
#if DUMP_PACKETS >= 2
#define MAX_SKB_DUMP 99
#elif DUMP_PACKETS >= 1
#define MAX_SKB_DUMP 30
#endif
#if DUMP_PACKETS > 0
        printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
               dev->name, skb->len, priv->lecid);
        print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
                       skb->data, min(MAX_SKB_DUMP, skb->len), true);
#endif /* DUMP_PACKETS > 0 */
        if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
                                /* Control frame, to daemon */
                struct sock *sk = sk_atm(vcc);

                pr_debug("%s: To daemon\n", dev->name);
                skb_queue_tail(&sk->sk_receive_queue, skb);
                sk->sk_data_ready(sk);
        } else {                /* Data frame, queue to protocol handlers */
                struct lec_arp_table *entry;
                unsigned char *src, *dst;

                atm_return(vcc, skb->truesize);
                if (*(__be16 *) skb->data == htons(priv->lecid) ||
                    !priv->lecd || !(dev->flags & IFF_UP)) {
                        /*
                         * Probably looping back, or if lecd is missing,
                         * lecd has gone down
                         */
                        pr_debug("Ignoring frame...\n");
                        dev_kfree_skb(skb);
                        return;
                }
                dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;

                /*
                 * If this is a Data Direct VCC, and the VCC does not match
                 * the LE_ARP cache entry, delete the LE_ARP cache entry.
                 */
                spin_lock_irqsave(&priv->lec_arp_lock, flags);
                if (lec_is_data_direct(vcc)) {
                        src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
                        entry = lec_arp_find(priv, src);
                        if (entry && entry->vcc != vcc) {
                                lec_arp_remove(priv, entry);
                                lec_arp_put(entry);
                        }
                }
                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);

                if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
                    !priv->is_proxy &&  /* Proxy wants all the packets */
                    memcmp(dst, dev->dev_addr, dev->addr_len)) {
                        dev_kfree_skb(skb);
                        return;
                }
                if (!hlist_empty(&priv->lec_arp_empty_ones))
                        lec_arp_check_empties(priv, vcc, skb);
                skb_pull(skb, 2);       /* skip lec_id */
                skb->protocol = eth_type_trans(skb, dev);
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += skb->len;
                memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
                netif_rx(skb);
        }
}

static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
        struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
        struct net_device *dev = skb->dev;

        if (vpriv == NULL) {
                pr_info("vpriv = NULL!?!?!?\n");
                return;
        }

        vpriv->old_pop(vcc, skb);

        if (vpriv->xoff && atm_may_send(vcc, 0)) {
                vpriv->xoff = 0;
                if (netif_running(dev) && netif_queue_stopped(dev))
                        netif_wake_queue(dev);
        }
}

static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
        struct lec_vcc_priv *vpriv;
        int bytes_left;
        struct atmlec_ioc ioc_data;

        /* Lecd must be up in this case */
        bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
        if (bytes_left != 0)
                pr_info("copy from user failed for %d bytes\n", bytes_left);
        if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
                return -EINVAL;
        ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
        if (!dev_lec[ioc_data.dev_num])
                return -EINVAL;
        vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
        if (!vpriv)
                return -ENOMEM;
        vpriv->xoff = 0;
        vpriv->old_pop = vcc->pop;
        vcc->user_back = vpriv;
        vcc->pop = lec_pop;
        lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
                      &ioc_data, vcc, vcc->push);
        vcc->proto_data = dev_lec[ioc_data.dev_num];
        vcc->push = lec_push;
        return 0;
}

static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
{
        if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
                return -EINVAL;
        vcc->proto_data = dev_lec[arg];
        return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
}

/* Initialize device. */
static int lecd_attach(struct atm_vcc *vcc, int arg)
{
        int i;
        struct lec_priv *priv;

        if (arg < 0)
                i = 0;
        else
                i = arg;
        if (arg >= MAX_LEC_ITF)
                return -EINVAL;
        if (!dev_lec[i]) {
                int size;

                size = sizeof(struct lec_priv);
                dev_lec[i] = alloc_etherdev(size);
                if (!dev_lec[i])
                        return -ENOMEM;
                dev_lec[i]->netdev_ops = &lec_netdev_ops;
                dev_lec[i]->max_mtu = 18190;
                snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
                if (register_netdev(dev_lec[i])) {
                        free_netdev(dev_lec[i]);
                        return -EINVAL;
                }

                priv = netdev_priv(dev_lec[i]);
        } else {
                priv = netdev_priv(dev_lec[i]);
                if (priv->lecd)
                        return -EADDRINUSE;
        }
        lec_arp_init(priv);
        priv->itfnum = i;       /* LANE2 addition */
        priv->lecd = vcc;
        vcc->dev = &lecatm_dev;
        vcc_insert_socket(sk_atm(vcc));

        vcc->proto_data = dev_lec[i];
        set_bit(ATM_VF_META, &vcc->flags);
        set_bit(ATM_VF_READY, &vcc->flags);

        /* Set default values to these variables */
        priv->maximum_unknown_frame_count = 1;
        priv->max_unknown_frame_time = (1 * HZ);
        priv->vcc_timeout_period = (1200 * HZ);
        priv->max_retry_count = 1;
        priv->aging_time = (300 * HZ);
        priv->forward_delay_time = (15 * HZ);
        priv->topology_change = 0;
        priv->arp_response_time = (1 * HZ);
        priv->flush_timeout = (4 * HZ);
        priv->path_switching_delay = (6 * HZ);

        if (dev_lec[i]->flags & IFF_UP)
                netif_start_queue(dev_lec[i]);
        __module_get(THIS_MODULE);
        return i;
}

#ifdef CONFIG_PROC_FS
static const char *lec_arp_get_status_string(unsigned char status)
{
        static const char *const lec_arp_status_string[] = {
                "ESI_UNKNOWN       ",
                "ESI_ARP_PENDING   ",
                "ESI_VC_PENDING    ",
                "<Undefined>       ",
                "ESI_FLUSH_PENDING ",
                "ESI_FORWARD_DIRECT"
        };

        if (status > ESI_FORWARD_DIRECT)
                status = 3;     /* ESI_UNDEFINED */
        return lec_arp_status_string[status];
}

static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
{
        int i;

        for (i = 0; i < ETH_ALEN; i++)
                seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
        seq_printf(seq, " ");
        for (i = 0; i < ATM_ESA_LEN; i++)
                seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
        seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
                   entry->flags & 0xffff);
        if (entry->vcc)
                seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
        else
                seq_printf(seq, "        ");
        if (entry->recv_vcc) {
                seq_printf(seq, "     %3d %3d", entry->recv_vcc->vpi,
                           entry->recv_vcc->vci);
        }
        seq_putc(seq, '\n');
}

struct lec_state {
        unsigned long flags;
        struct lec_priv *locked;
        struct hlist_node *node;
        struct net_device *dev;
        int itf;
        int arp_table;
        int misc_table;
};

static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
                          loff_t *l)
{
        struct hlist_node *e = state->node;

        if (!e)
                e = tbl->first;
        if (e == SEQ_START_TOKEN) {
                e = tbl->first;
                --*l;
        }

        for (; e; e = e->next) {
                if (--*l < 0)
                        break;
        }
        state->node = e;

        return (*l < 0) ? state : NULL;
}

static void *lec_arp_walk(struct lec_state *state, loff_t *l,
                          struct lec_priv *priv)
{
        void *v = NULL;
        int p;

        for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
                v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
                if (v)
                        break;
        }
        state->arp_table = p;
        return v;
}

static void *lec_misc_walk(struct lec_state *state, loff_t *l,
                           struct lec_priv *priv)
{
        struct hlist_head *lec_misc_tables[] = {
                &priv->lec_arp_empty_ones,
                &priv->lec_no_forward,
                &priv->mcast_fwds
        };
        void *v = NULL;
        int q;

        for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
                v = lec_tbl_walk(state, lec_misc_tables[q], l);
                if (v)
                        break;
        }
        state->misc_table = q;
        return v;
}

static void *lec_priv_walk(struct lec_state *state, loff_t *l,
                           struct lec_priv *priv)
{
        if (!state->locked) {
                state->locked = priv;
                spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
        }
        if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
                spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
                state->locked = NULL;
                /* Partial state reset for the next time we get called */
                state->arp_table = state->misc_table = 0;
        }
        return state->locked;
}

static void *lec_itf_walk(struct lec_state *state, loff_t *l)
{
        struct net_device *dev;
        void *v;

        dev = state->dev ? state->dev : dev_lec[state->itf];
        v = (dev && netdev_priv(dev)) ?
                lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
        if (!v && dev) {
                dev_put(dev);
                /* Partial state reset for the next time we get called */
                dev = NULL;
        }
        state->dev = dev;
        return v;
}

static void *lec_get_idx(struct lec_state *state, loff_t l)
{
        void *v = NULL;

        for (; state->itf < MAX_LEC_ITF; state->itf++) {
                v = lec_itf_walk(state, &l);
                if (v)
                        break;
        }
        return v;
}

static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
{
        struct lec_state *state = seq->private;

        state->itf = 0;
        state->dev = NULL;
        state->locked = NULL;
        state->arp_table = 0;
        state->misc_table = 0;
        state->node = SEQ_START_TOKEN;

        return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
}

static void lec_seq_stop(struct seq_file *seq, void *v)
{
        struct lec_state *state = seq->private;

        if (state->dev) {
                spin_unlock_irqrestore(&state->locked->lec_arp_lock,
                                       state->flags);
                dev_put(state->dev);
        }
}

static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
        struct lec_state *state = seq->private;

        v = lec_get_idx(state, 1);
        *pos += !!PTR_ERR(v);
        return v;
}

static int lec_seq_show(struct seq_file *seq, void *v)
{
        static const char lec_banner[] =
            "Itf  MAC          ATM destination"
            "                          Status            Flags "
            "VPI/VCI Recv VPI/VCI\n";

        if (v == SEQ_START_TOKEN)
                seq_puts(seq, lec_banner);
        else {
                struct lec_state *state = seq->private;
                struct net_device *dev = state->dev;
                struct lec_arp_table *entry = hlist_entry(state->node,
                                                          struct lec_arp_table,
                                                          next);

                seq_printf(seq, "%s ", dev->name);
                lec_info(seq, entry);
        }
        return 0;
}

static const struct seq_operations lec_seq_ops = {
        .start = lec_seq_start,
        .next = lec_seq_next,
        .stop = lec_seq_stop,
        .show = lec_seq_show,
};
#endif

static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
        struct atm_vcc *vcc = ATM_SD(sock);
        int err = 0;

        switch (cmd) {
        case ATMLEC_CTRL:

        case ATMLEC_MCAST:
        case ATMLEC_DATA:
                if (!capable(CAP_NET_ADMIN))
                        return -EPERM;
                break;
        default:
                return -ENOIOCTLCMD;
        }

        switch (cmd) {
        case ATMLEC_CTRL:
                err = lecd_attach(vcc, (int)arg);
                if (err >= 0)
                        sock->state = SS_CONNECTED;
                break;
        case ATMLEC_MCAST:
                err = lec_mcast_attach(vcc, (int)arg);
                break;
        case ATMLEC_DATA:
                err = lec_vcc_attach(vcc, (void __user *)arg);
                break;
        }

        return err;
}

static struct atm_ioctl lane_ioctl_ops = {
        .owner = THIS_MODULE,
        .ioctl = lane_ioctl,
};

static int __init lane_module_init(void)
{
#ifdef CONFIG_PROC_FS
        struct proc_dir_entry *p;

        p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
                        sizeof(struct lec_state), NULL);
        if (!p) {
                pr_err("Unable to initialize /proc/net/atm/lec\n");
                return -ENOMEM;
        }
#endif

        register_atm_ioctl(&lane_ioctl_ops);
        pr_info("lec.c: initialized\n");
        return 0;
}

static void __exit lane_module_cleanup(void)
{
        int i;

#ifdef CONFIG_PROC_FS
        remove_proc_entry("lec", atm_proc_root);
#endif

        deregister_atm_ioctl(&lane_ioctl_ops);

        for (i = 0; i < MAX_LEC_ITF; i++) {
                if (dev_lec[i] != NULL) {
                        unregister_netdev(dev_lec[i]);
                        free_netdev(dev_lec[i]);
                        dev_lec[i] = NULL;
                }
        }
}

module_init(lane_module_init);
module_exit(lane_module_cleanup);

/*
 * LANE2: 3.1.3, LE_RESOLVE.request
 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
 * If sizeoftlvs == NULL the default TLVs associated with with this
 * lec will be used.
 * If dst_mac == NULL, targetless LE_ARP will be sent
 */
static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
                         u8 **tlvs, u32 *sizeoftlvs)
{
        unsigned long flags;
        struct lec_priv *priv = netdev_priv(dev);
        struct lec_arp_table *table;
        struct sk_buff *skb;
        int retval;

        if (force == 0) {
                spin_lock_irqsave(&priv->lec_arp_lock, flags);
                table = lec_arp_find(priv, dst_mac);
                spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
                if (table == NULL)
                        return -1;

                *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
                if (*tlvs == NULL)
                        return -1;

                *sizeoftlvs = table->sizeoftlvs;

                return 0;
        }

        if (sizeoftlvs == NULL)
                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);

        else {
                skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
                if (skb == NULL)
                        return -1;
                skb->len = *sizeoftlvs;
                skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
                retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
        }
        return retval;
}

/*
 * LANE2: 3.1.4, LE_ASSOCIATE.request
 * Associate the *tlvs with the *lan_dst address.
 * Will overwrite any previous association
 * Returns 1 for success, 0 for failure (out of memory)
 *
 */
static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
                               const u8 *tlvs, u32 sizeoftlvs)
{
        int retval;
        struct sk_buff *skb;
        struct lec_priv *priv = netdev_priv(dev);

        if (!ether_addr_equal(lan_dst, dev->dev_addr))
                return 0;       /* not our mac address */

        kfree(priv->tlvs);      /* NULL if there was no previous association */

        priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
        if (priv->tlvs == NULL)
                return 0;
        priv->sizeoftlvs = sizeoftlvs;

        skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
        if (skb == NULL)
                return 0;
        skb->len = sizeoftlvs;
        skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
        retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
        if (retval != 0)
                pr_info("lec.c: lane2_associate_req() failed\n");
        /*
         * If the previous association has changed we must
         * somehow notify other LANE entities about the change
         */
        return 1;
}

/*
 * LANE2: 3.1.5, LE_ASSOCIATE.indication
 *
 */
static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
                                const u8 *tlvs, u32 sizeoftlvs)
{
#if 0
        int i = 0;
#endif
        struct lec_priv *priv = netdev_priv(dev);
#if 0                           /*
                                 * Why have the TLVs in LE_ARP entries
                                 * since we do not use them? When you
                                 * uncomment this code, make sure the
                                 * TLVs get freed when entry is killed
                                 */
        struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);

        if (entry == NULL)
                return;         /* should not happen */

        kfree(entry->tlvs);

        entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
        if (entry->tlvs == NULL)
                return;
        entry->sizeoftlvs = sizeoftlvs;
#endif
#if 0
        pr_info("\n");
        pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
        while (i < sizeoftlvs)
                pr_cont("%02x ", tlvs[i++]);

        pr_cont("\n");
#endif

        /* tell MPOA about the TLVs we saw */
        if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
                priv->lane2_ops->associate_indicator(dev, mac_addr,
                                                     tlvs, sizeoftlvs);
        }
}

/*
 * Here starts what used to lec_arpc.c
 *
 * lec_arpc.c was added here when making
 * lane client modular. October 1997
 */

#include <linux/types.h>
#include <linux/timer.h>
#include <linux/param.h>
#include <linux/atomic.h>
#include <linux/inetdevice.h>
#include <net/route.h>

#if 0
#define pr_debug(format, args...)
/*
  #define pr_debug printk
*/
#endif
#define DEBUG_ARP_TABLE 0

#define LEC_ARP_REFRESH_INTERVAL (3*HZ)

static void lec_arp_check_expire(struct work_struct *work);
static void lec_arp_expire_arp(struct timer_list *t);

/*
 * Arp table funcs
 */

#define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))

/*
 * Initialization of arp-cache
 */
static void lec_arp_init(struct lec_priv *priv)
{
        unsigned short i;

        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
        INIT_HLIST_HEAD(&priv->lec_no_forward);
        INIT_HLIST_HEAD(&priv->mcast_fwds);
        spin_lock_init(&priv->lec_arp_lock);
        INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
}

static void lec_arp_clear_vccs(struct lec_arp_table *entry)
{
        if (entry->vcc) {
                struct atm_vcc *vcc = entry->vcc;
                struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
                struct net_device *dev = (struct net_device *)vcc->proto_data;

                vcc->pop = vpriv->old_pop;
                if (vpriv->xoff)
                        netif_wake_queue(dev);
                kfree(vpriv);
                vcc->user_back = NULL;
                vcc->push = entry->old_push;
                vcc_release_async(vcc, -EPIPE);
                entry->vcc = NULL;
        }
        if (entry->recv_vcc) {
                entry->recv_vcc->push = entry->old_recv_push;
                vcc_release_async(entry->recv_vcc, -EPIPE);
                entry->recv_vcc = NULL;
        }
}

/*
 * Insert entry to lec_arp_table
 * LANE2: Add to the end of the list to satisfy 8.1.13
 */
static inline void
lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
{
        struct hlist_head *tmp;

        tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
        hlist_add_head(&entry->next, tmp);

        pr_debug("Added entry:%pM\n", entry->mac_addr);
}

/*
 * Remove entry from lec_arp_table
 */
static int
lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
{
        struct lec_arp_table *entry;
        int i, remove_vcc = 1;

        if (!to_remove)
                return -1;

        hlist_del(&to_remove->next);
        del_timer(&to_remove->timer);

        /*
         * If this is the only MAC connected to this VCC,
         * also tear down the VCC
         */
        if (to_remove->status >= ESI_FLUSH_PENDING) {
                /*
                 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
                 */
                for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                        hlist_for_each_entry(entry,
                                             &priv->lec_arp_tables[i], next) {
                                if (memcmp(to_remove->atm_addr,
                                           entry->atm_addr, ATM_ESA_LEN) == 0) {
                                        remove_vcc = 0;
                                        break;
                                }
                        }
                }
                if (remove_vcc)
                        lec_arp_clear_vccs(to_remove);
        }
        skb_queue_purge(&to_remove->tx_wait);   /* FIXME: good place for this? */

        pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
        return 0;
}

#if DEBUG_ARP_TABLE
static const char *get_status_string(unsigned char st)
{
        switch (st) {
        case ESI_UNKNOWN:
                return "ESI_UNKNOWN";
        case ESI_ARP_PENDING:
                return "ESI_ARP_PENDING";
        case ESI_VC_PENDING:
                return "ESI_VC_PENDING";
        case ESI_FLUSH_PENDING:
                return "ESI_FLUSH_PENDING";
        case ESI_FORWARD_DIRECT:
                return "ESI_FORWARD_DIRECT";
        }
        return "<UNKNOWN>";
}

static void dump_arp_table(struct lec_priv *priv)
{
        struct lec_arp_table *rulla;
        char buf[256];
        int i, j, offset;

        pr_info("Dump %p:\n", priv);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry(rulla,
                                     &priv->lec_arp_tables[i], next) {
                        offset = 0;
                        offset += sprintf(buf, "%d: %p\n", i, rulla);
                        offset += sprintf(buf + offset, "Mac: %pM",
                                          rulla->mac_addr);
                        offset += sprintf(buf + offset, " Atm:");
                        for (j = 0; j < ATM_ESA_LEN; j++) {
                                offset += sprintf(buf + offset,
                                                  "%2.2x ",
                                                  rulla->atm_addr[j] & 0xff);
                        }
                        offset += sprintf(buf + offset,
                                          "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
                                          rulla->vcc ? rulla->vcc->vpi : 0,
                                          rulla->vcc ? rulla->vcc->vci : 0,
                                          rulla->recv_vcc ? rulla->recv_vcc->
                                          vpi : 0,
                                          rulla->recv_vcc ? rulla->recv_vcc->
                                          vci : 0, rulla->last_used,
                                          rulla->timestamp, rulla->no_tries);
                        offset +=
                            sprintf(buf + offset,
                                    "Flags:%x, Packets_flooded:%x, Status: %s ",
                                    rulla->flags, rulla->packets_flooded,
                                    get_status_string(rulla->status));
                        pr_info("%s\n", buf);
                }
        }

        if (!hlist_empty(&priv->lec_no_forward))
                pr_info("No forward\n");
        hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
                offset = 0;
                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
                offset += sprintf(buf + offset, " Atm:");
                for (j = 0; j < ATM_ESA_LEN; j++) {
                        offset += sprintf(buf + offset, "%2.2x ",
                                          rulla->atm_addr[j] & 0xff);
                }
                offset += sprintf(buf + offset,
                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
                                  rulla->vcc ? rulla->vcc->vpi : 0,
                                  rulla->vcc ? rulla->vcc->vci : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
                                  rulla->last_used,
                                  rulla->timestamp, rulla->no_tries);
                offset += sprintf(buf + offset,
                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
                                  rulla->flags, rulla->packets_flooded,
                                  get_status_string(rulla->status));
                pr_info("%s\n", buf);
        }

        if (!hlist_empty(&priv->lec_arp_empty_ones))
                pr_info("Empty ones\n");
        hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
                offset = 0;
                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
                offset += sprintf(buf + offset, " Atm:");
                for (j = 0; j < ATM_ESA_LEN; j++) {
                        offset += sprintf(buf + offset, "%2.2x ",
                                          rulla->atm_addr[j] & 0xff);
                }
                offset += sprintf(buf + offset,
                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
                                  rulla->vcc ? rulla->vcc->vpi : 0,
                                  rulla->vcc ? rulla->vcc->vci : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
                                  rulla->last_used,
                                  rulla->timestamp, rulla->no_tries);
                offset += sprintf(buf + offset,
                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
                                  rulla->flags, rulla->packets_flooded,
                                  get_status_string(rulla->status));
                pr_info("%s", buf);
        }

        if (!hlist_empty(&priv->mcast_fwds))
                pr_info("Multicast Forward VCCs\n");
        hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
                offset = 0;
                offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
                offset += sprintf(buf + offset, " Atm:");
                for (j = 0; j < ATM_ESA_LEN; j++) {
                        offset += sprintf(buf + offset, "%2.2x ",
                                          rulla->atm_addr[j] & 0xff);
                }
                offset += sprintf(buf + offset,
                                  "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
                                  rulla->vcc ? rulla->vcc->vpi : 0,
                                  rulla->vcc ? rulla->vcc->vci : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
                                  rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
                                  rulla->last_used,
                                  rulla->timestamp, rulla->no_tries);
                offset += sprintf(buf + offset,
                                  "Flags:%x, Packets_flooded:%x, Status: %s ",
                                  rulla->flags, rulla->packets_flooded,
                                  get_status_string(rulla->status));
                pr_info("%s\n", buf);
        }

}
#else
#define dump_arp_table(priv) do { } while (0)
#endif

/*
 * Destruction of arp-cache
 */
static void lec_arp_destroy(struct lec_priv *priv)
{
        unsigned long flags;
        struct hlist_node *next;
        struct lec_arp_table *entry;
        int i;

        cancel_delayed_work_sync(&priv->lec_arp_work);

        /*
         * Remove all entries
         */

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry_safe(entry, next,
                                          &priv->lec_arp_tables[i], next) {
                        lec_arp_remove(priv, entry);
                        lec_arp_put(entry);
                }
                INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
        }

        hlist_for_each_entry_safe(entry, next,
                                  &priv->lec_arp_empty_ones, next) {
                del_timer_sync(&entry->timer);
                lec_arp_clear_vccs(entry);
                hlist_del(&entry->next);
                lec_arp_put(entry);
        }
        INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);

        hlist_for_each_entry_safe(entry, next,
                                  &priv->lec_no_forward, next) {
                del_timer_sync(&entry->timer);
                lec_arp_clear_vccs(entry);
                hlist_del(&entry->next);
                lec_arp_put(entry);
        }
        INIT_HLIST_HEAD(&priv->lec_no_forward);

        hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
                /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
                lec_arp_clear_vccs(entry);
                hlist_del(&entry->next);
                lec_arp_put(entry);
        }
        INIT_HLIST_HEAD(&priv->mcast_fwds);
        priv->mcast_vcc = NULL;
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}

/*
 * Find entry by mac_address
 */
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
                                          const unsigned char *mac_addr)
{
        struct hlist_head *head;
        struct lec_arp_table *entry;

        pr_debug("%pM\n", mac_addr);

        head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
        hlist_for_each_entry(entry, head, next) {
                if (ether_addr_equal(mac_addr, entry->mac_addr))
                        return entry;
        }
        return NULL;
}

static struct lec_arp_table *make_entry(struct lec_priv *priv,
                                        const unsigned char *mac_addr)
{
        struct lec_arp_table *to_return;

        to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
        if (!to_return) {
                pr_info("LEC: Arp entry kmalloc failed\n");
                return NULL;
        }
        ether_addr_copy(to_return->mac_addr, mac_addr);
        INIT_HLIST_NODE(&to_return->next);
        timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
        to_return->last_used = jiffies;
        to_return->priv = priv;
        skb_queue_head_init(&to_return->tx_wait);
        refcount_set(&to_return->usage, 1);
        return to_return;
}

/* Arp sent timer expired */
static void lec_arp_expire_arp(struct timer_list *t)
{
        struct lec_arp_table *entry;

        entry = from_timer(entry, t, timer);

        pr_debug("\n");
        if (entry->status == ESI_ARP_PENDING) {
                if (entry->no_tries <= entry->priv->max_retry_count) {
                        if (entry->is_rdesc)
                                send_to_lecd(entry->priv, l_rdesc_arp_xmt,
                                             entry->mac_addr, NULL, NULL);
                        else
                                send_to_lecd(entry->priv, l_arp_xmt,
                                             entry->mac_addr, NULL, NULL);
                        entry->no_tries++;
                }
                mod_timer(&entry->timer, jiffies + (1 * HZ));
        }
}

/* Unknown/unused vcc expire, remove associated entry */
static void lec_arp_expire_vcc(struct timer_list *t)
{
        unsigned long flags;
        struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
        struct lec_priv *priv = to_remove->priv;

        del_timer(&to_remove->timer);

        pr_debug("%p %p: vpi:%d vci:%d\n",
                 to_remove, priv,
                 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
                 to_remove->vcc ? to_remove->recv_vcc->vci : 0);

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        hlist_del(&to_remove->next);
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);

        lec_arp_clear_vccs(to_remove);
        lec_arp_put(to_remove);
}

static bool __lec_arp_check_expire(struct lec_arp_table *entry,
                                   unsigned long now,
                                   struct lec_priv *priv)
{
        unsigned long time_to_check;

        if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
                time_to_check = priv->forward_delay_time;
        else
                time_to_check = priv->aging_time;

        pr_debug("About to expire: %lx - %lx > %lx\n",
                 now, entry->last_used, time_to_check);
        if (time_after(now, entry->last_used + time_to_check) &&
            !(entry->flags & LEC_PERMANENT_FLAG) &&
            !(entry->mac_addr[0] & 0x01)) {     /* LANE2: 7.1.20 */
                /* Remove entry */
                pr_debug("Entry timed out\n");
                lec_arp_remove(priv, entry);
                lec_arp_put(entry);
        } else {
                /* Something else */
                if ((entry->status == ESI_VC_PENDING ||
                     entry->status == ESI_ARP_PENDING) &&
                    time_after_eq(now, entry->timestamp +
                                       priv->max_unknown_frame_time)) {
                        entry->timestamp = jiffies;
                        entry->packets_flooded = 0;
                        if (entry->status == ESI_VC_PENDING)
                                send_to_lecd(priv, l_svc_setup,
                                             entry->mac_addr,
                                             entry->atm_addr,
                                             NULL);
                }
                if (entry->status == ESI_FLUSH_PENDING &&
                    time_after_eq(now, entry->timestamp +
                                       priv->path_switching_delay)) {
                        lec_arp_hold(entry);
                        return true;
                }
        }

        return false;
}
/*
 * Expire entries.
 * 1. Re-set timer
 * 2. For each entry, delete entries that have aged past the age limit.
 * 3. For each entry, depending on the status of the entry, perform
 *    the following maintenance.
 *    a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
 *       tick_count is above the max_unknown_frame_time, clear
 *       the tick_count to zero and clear the packets_flooded counter
 *       to zero. This supports the packet rate limit per address
 *       while flooding unknowns.
 *    b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
 *       than or equal to the path_switching_delay, change the status
 *       to ESI_FORWARD_DIRECT. This causes the flush period to end
 *       regardless of the progress of the flush protocol.
 */
static void lec_arp_check_expire(struct work_struct *work)
{
        unsigned long flags;
        struct lec_priv *priv =
                container_of(work, struct lec_priv, lec_arp_work.work);
        struct hlist_node *next;
        struct lec_arp_table *entry;
        unsigned long now;
        int i;

        pr_debug("%p\n", priv);
        now = jiffies;
restart:
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry_safe(entry, next,
                                          &priv->lec_arp_tables[i], next) {
                        if (__lec_arp_check_expire(entry, now, priv)) {
                                struct sk_buff *skb;
                                struct atm_vcc *vcc = entry->vcc;

                                spin_unlock_irqrestore(&priv->lec_arp_lock,
                                                       flags);
                                while ((skb = skb_dequeue(&entry->tx_wait)))
                                        lec_send(vcc, skb);
                                entry->last_used = jiffies;
                                entry->status = ESI_FORWARD_DIRECT;
                                lec_arp_put(entry);

                                goto restart;
                        }
                }
        }
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);

        schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
}

/*
 * Try to find vcc where mac_address is attached.
 *
 */
static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
                                       const unsigned char *mac_to_find,
                                       int is_rdesc,
                                       struct lec_arp_table **ret_entry)
{
        unsigned long flags;
        struct lec_arp_table *entry;
        struct atm_vcc *found;

        if (mac_to_find[0] & 0x01) {
                switch (priv->lane_version) {
                case 1:
                        return priv->mcast_vcc;
                case 2: /* LANE2 wants arp for multicast addresses */
                        if (ether_addr_equal(mac_to_find, bus_mac))
                                return priv->mcast_vcc;
                        break;
                default:
                        break;
                }
        }

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        entry = lec_arp_find(priv, mac_to_find);

        if (entry) {
                if (entry->status == ESI_FORWARD_DIRECT) {
                        /* Connection Ok */
                        entry->last_used = jiffies;
                        lec_arp_hold(entry);
                        *ret_entry = entry;
                        found = entry->vcc;
                        goto out;
                }
                /*
                 * If the LE_ARP cache entry is still pending, reset count to 0
                 * so another LE_ARP request can be made for this frame.
                 */
                if (entry->status == ESI_ARP_PENDING)
                        entry->no_tries = 0;
                /*
                 * Data direct VC not yet set up, check to see if the unknown
                 * frame count is greater than the limit. If the limit has
                 * not been reached, allow the caller to send packet to
                 * BUS.
                 */
                if (entry->status != ESI_FLUSH_PENDING &&
                    entry->packets_flooded <
                    priv->maximum_unknown_frame_count) {
                        entry->packets_flooded++;
                        pr_debug("Flooding..\n");
                        found = priv->mcast_vcc;
                        goto out;
                }
                /*
                 * We got here because entry->status == ESI_FLUSH_PENDING
                 * or BUS flood limit was reached for an entry which is
                 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
                 */
                lec_arp_hold(entry);
                *ret_entry = entry;
                pr_debug("entry->status %d entry->vcc %p\n", entry->status,
                         entry->vcc);
                found = NULL;
        } else {
                /* No matching entry was found */
                entry = make_entry(priv, mac_to_find);
                pr_debug("Making entry\n");
                if (!entry) {
                        found = priv->mcast_vcc;
                        goto out;
                }
                lec_arp_add(priv, entry);
                /* We want arp-request(s) to be sent */
                entry->packets_flooded = 1;
                entry->status = ESI_ARP_PENDING;
                entry->no_tries = 1;
                entry->last_used = entry->timestamp = jiffies;
                entry->is_rdesc = is_rdesc;
                if (entry->is_rdesc)
                        send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
                                     NULL);
                else
                        send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
                entry->timer.expires = jiffies + (1 * HZ);
                entry->timer.function = lec_arp_expire_arp;
                add_timer(&entry->timer);
                found = priv->mcast_vcc;
        }

out:
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
        return found;
}

static int
lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
                unsigned long permanent)
{
        unsigned long flags;
        struct hlist_node *next;
        struct lec_arp_table *entry;
        int i;

        pr_debug("\n");
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry_safe(entry, next,
                                          &priv->lec_arp_tables[i], next) {
                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
                            (permanent ||
                             !(entry->flags & LEC_PERMANENT_FLAG))) {
                                lec_arp_remove(priv, entry);
                                lec_arp_put(entry);
                        }
                        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
                        return 0;
                }
        }
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
        return -1;
}

/*
 * Notifies:  Response to arp_request (atm_addr != NULL)
 */
static void
lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
               const unsigned char *atm_addr, unsigned long remoteflag,
               unsigned int targetless_le_arp)
{
        unsigned long flags;
        struct hlist_node *next;
        struct lec_arp_table *entry, *tmp;
        int i;

        pr_debug("%smac:%pM\n",
                 (targetless_le_arp) ? "targetless " : "", mac_addr);

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        entry = lec_arp_find(priv, mac_addr);
        if (entry == NULL && targetless_le_arp)
                goto out;       /*
                                 * LANE2: ignore targetless LE_ARPs for which
                                 * we have no entry in the cache. 7.1.30
                                 */
        if (!hlist_empty(&priv->lec_arp_empty_ones)) {
                hlist_for_each_entry_safe(entry, next,
                                          &priv->lec_arp_empty_ones, next) {
                        if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
                                hlist_del(&entry->next);
                                del_timer(&entry->timer);
                                tmp = lec_arp_find(priv, mac_addr);
                                if (tmp) {
                                        del_timer(&tmp->timer);
                                        tmp->status = ESI_FORWARD_DIRECT;
                                        memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
                                        tmp->vcc = entry->vcc;
                                        tmp->old_push = entry->old_push;
                                        tmp->last_used = jiffies;
                                        del_timer(&entry->timer);
                                        lec_arp_put(entry);
                                        entry = tmp;
                                } else {
                                        entry->status = ESI_FORWARD_DIRECT;
                                        ether_addr_copy(entry->mac_addr,
                                                        mac_addr);
                                        entry->last_used = jiffies;
                                        lec_arp_add(priv, entry);
                                }
                                if (remoteflag)
                                        entry->flags |= LEC_REMOTE_FLAG;
                                else
                                        entry->flags &= ~LEC_REMOTE_FLAG;
                                pr_debug("After update\n");
                                dump_arp_table(priv);
                                goto out;
                        }
                }
        }

        entry = lec_arp_find(priv, mac_addr);
        if (!entry) {
                entry = make_entry(priv, mac_addr);
                if (!entry)
                        goto out;
                entry->status = ESI_UNKNOWN;
                lec_arp_add(priv, entry);
                /* Temporary, changes before end of function */
        }
        memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
        del_timer(&entry->timer);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry(tmp,
                                     &priv->lec_arp_tables[i], next) {
                        if (entry != tmp &&
                            !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
                                /* Vcc to this host exists */
                                if (tmp->status > ESI_VC_PENDING) {
                                        /*
                                         * ESI_FLUSH_PENDING,
                                         * ESI_FORWARD_DIRECT
                                         */
                                        entry->vcc = tmp->vcc;
                                        entry->old_push = tmp->old_push;
                                }
                                entry->status = tmp->status;
                                break;
                        }
                }
        }
        if (remoteflag)
                entry->flags |= LEC_REMOTE_FLAG;
        else
                entry->flags &= ~LEC_REMOTE_FLAG;
        if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
                entry->status = ESI_VC_PENDING;
                send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
        }
        pr_debug("After update2\n");
        dump_arp_table(priv);
out:
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}

/*
 * Notifies: Vcc setup ready
 */
static void
lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
              struct atm_vcc *vcc,
              void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
{
        unsigned long flags;
        struct lec_arp_table *entry;
        int i, found_entry = 0;

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
        if (ioc_data->receive == 2) {
                pr_debug("LEC_ARP: Attaching mcast forward\n");
#if 0
                entry = lec_arp_find(priv, bus_mac);
                if (!entry) {
                        pr_info("LEC_ARP: Multicast entry not found!\n");
                        goto out;
                }
                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
                entry->recv_vcc = vcc;
                entry->old_recv_push = old_push;
#endif
                entry = make_entry(priv, bus_mac);
                if (entry == NULL)
                        goto out;
                del_timer(&entry->timer);
                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
                entry->recv_vcc = vcc;
                entry->old_recv_push = old_push;
                hlist_add_head(&entry->next, &priv->mcast_fwds);
                goto out;
        } else if (ioc_data->receive == 1) {
                /*
                 * Vcc which we don't want to make default vcc,
                 * attach it anyway.
                 */
                pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
                         ioc_data->atm_addr[0], ioc_data->atm_addr[1],
                         ioc_data->atm_addr[2], ioc_data->atm_addr[3],
                         ioc_data->atm_addr[4], ioc_data->atm_addr[5],
                         ioc_data->atm_addr[6], ioc_data->atm_addr[7],
                         ioc_data->atm_addr[8], ioc_data->atm_addr[9],
                         ioc_data->atm_addr[10], ioc_data->atm_addr[11],
                         ioc_data->atm_addr[12], ioc_data->atm_addr[13],
                         ioc_data->atm_addr[14], ioc_data->atm_addr[15],
                         ioc_data->atm_addr[16], ioc_data->atm_addr[17],
                         ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
                entry = make_entry(priv, bus_mac);
                if (entry == NULL)
                        goto out;
                memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
                eth_zero_addr(entry->mac_addr);
                entry->recv_vcc = vcc;
                entry->old_recv_push = old_push;
                entry->status = ESI_UNKNOWN;
                entry->timer.expires = jiffies + priv->vcc_timeout_period;
                entry->timer.function = lec_arp_expire_vcc;
                hlist_add_head(&entry->next, &priv->lec_no_forward);
                add_timer(&entry->timer);
                dump_arp_table(priv);
                goto out;
        }
        pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
                 ioc_data->atm_addr[0], ioc_data->atm_addr[1],

                 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
                 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
                 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
                 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
                 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
                 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
                 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
                 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
                 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry(entry,
                                     &priv->lec_arp_tables[i], next) {
                        if (memcmp
                            (ioc_data->atm_addr, entry->atm_addr,
                             ATM_ESA_LEN) == 0) {
                                pr_debug("LEC_ARP: Attaching data direct\n");
                                pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
                                         entry->vcc ? entry->vcc->vci : 0,
                                         entry->recv_vcc ? entry->recv_vcc->
                                         vci : 0);
                                found_entry = 1;
                                del_timer(&entry->timer);
                                entry->vcc = vcc;
                                entry->old_push = old_push;
                                if (entry->status == ESI_VC_PENDING) {
                                        if (priv->maximum_unknown_frame_count
                                            == 0)
                                                entry->status =
                                                    ESI_FORWARD_DIRECT;
                                        else {
                                                entry->timestamp = jiffies;
                                                entry->status =
                                                    ESI_FLUSH_PENDING;
#if 0
                                                send_to_lecd(priv, l_flush_xmt,
                                                             NULL,
                                                             entry->atm_addr,
                                                             NULL);
#endif
                                        }
                                } else {
                                        /*
                                         * They were forming a connection
                                         * to us, and we to them. Our
                                         * ATM address is numerically lower
                                         * than theirs, so we make connection
                                         * we formed into default VCC (8.1.11).
                                         * Connection they made gets torn
                                         * down. This might confuse some
                                         * clients. Can be changed if
                                         * someone reports trouble...
                                         */
                                        ;
                                }
                        }
                }
        }
        if (found_entry) {
                pr_debug("After vcc was added\n");
                dump_arp_table(priv);
                goto out;
        }
        /*
         * Not found, snatch address from first data packet that arrives
         * from this vcc
         */
        entry = make_entry(priv, bus_mac);
        if (!entry)
                goto out;
        entry->vcc = vcc;
        entry->old_push = old_push;
        memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
        eth_zero_addr(entry->mac_addr);
        entry->status = ESI_UNKNOWN;
        hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
        entry->timer.expires = jiffies + priv->vcc_timeout_period;
        entry->timer.function = lec_arp_expire_vcc;
        add_timer(&entry->timer);
        pr_debug("After vcc was added\n");
        dump_arp_table(priv);
out:
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}

static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
{
        unsigned long flags;
        struct lec_arp_table *entry;
        int i;

        pr_debug("%lx\n", tran_id);
restart:
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry(entry,
                                     &priv->lec_arp_tables[i], next) {
                        if (entry->flush_tran_id == tran_id &&
                            entry->status == ESI_FLUSH_PENDING) {
                                struct sk_buff *skb;
                                struct atm_vcc *vcc = entry->vcc;

                                lec_arp_hold(entry);
                                spin_unlock_irqrestore(&priv->lec_arp_lock,
                                                       flags);
                                while ((skb = skb_dequeue(&entry->tx_wait)))
                                        lec_send(vcc, skb);
                                entry->last_used = jiffies;
                                entry->status = ESI_FORWARD_DIRECT;
                                lec_arp_put(entry);
                                pr_debug("LEC_ARP: Flushed\n");
                                goto restart;
                        }
                }
        }
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
        dump_arp_table(priv);
}

static void
lec_set_flush_tran_id(struct lec_priv *priv,
                      const unsigned char *atm_addr, unsigned long tran_id)
{
        unsigned long flags;
        struct lec_arp_table *entry;
        int i;

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
                hlist_for_each_entry(entry,
                                     &priv->lec_arp_tables[i], next) {
                        if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
                                entry->flush_tran_id = tran_id;
                                pr_debug("Set flush transaction id to %lx for %p\n",
                                         tran_id, entry);
                        }
                }
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}

static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
{
        unsigned long flags;
        unsigned char mac_addr[] = {
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff
        };
        struct lec_arp_table *to_add;
        struct lec_vcc_priv *vpriv;
        int err = 0;

        vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
        if (!vpriv)
                return -ENOMEM;
        vpriv->xoff = 0;
        vpriv->old_pop = vcc->pop;
        vcc->user_back = vpriv;
        vcc->pop = lec_pop;
        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        to_add = make_entry(priv, mac_addr);
        if (!to_add) {
                vcc->pop = vpriv->old_pop;
                kfree(vpriv);
                err = -ENOMEM;
                goto out;
        }
        memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
        to_add->status = ESI_FORWARD_DIRECT;
        to_add->flags |= LEC_PERMANENT_FLAG;
        to_add->vcc = vcc;
        to_add->old_push = vcc->push;
        vcc->push = lec_push;
        priv->mcast_vcc = vcc;
        lec_arp_add(priv, to_add);
out:
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
        return err;
}

static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
{
        unsigned long flags;
        struct hlist_node *next;
        struct lec_arp_table *entry;
        int i;

        pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
        dump_arp_table(priv);

        spin_lock_irqsave(&priv->lec_arp_lock, flags);

        for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
                hlist_for_each_entry_safe(entry, next,
                                          &priv->lec_arp_tables[i], next) {
                        if (vcc == entry->vcc) {
                                lec_arp_remove(priv, entry);
                                lec_arp_put(entry);
                                if (priv->mcast_vcc == vcc)
                                        priv->mcast_vcc = NULL;
                        }
                }
        }

        hlist_for_each_entry_safe(entry, next,
                                  &priv->lec_arp_empty_ones, next) {
                if (entry->vcc == vcc) {
                        lec_arp_clear_vccs(entry);
                        del_timer(&entry->timer);
                        hlist_del(&entry->next);
                        lec_arp_put(entry);
                }
        }

        hlist_for_each_entry_safe(entry, next,
                                  &priv->lec_no_forward, next) {
                if (entry->recv_vcc == vcc) {
                        lec_arp_clear_vccs(entry);
                        del_timer(&entry->timer);
                        hlist_del(&entry->next);
                        lec_arp_put(entry);
                }
        }

        hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
                if (entry->recv_vcc == vcc) {
                        lec_arp_clear_vccs(entry);
                        /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
                        hlist_del(&entry->next);
                        lec_arp_put(entry);
                }
        }

        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
        dump_arp_table(priv);
}

static void
lec_arp_check_empties(struct lec_priv *priv,
                      struct atm_vcc *vcc, struct sk_buff *skb)
{
        unsigned long flags;
        struct hlist_node *next;
        struct lec_arp_table *entry, *tmp;
        struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
        unsigned char *src = hdr->h_source;

        spin_lock_irqsave(&priv->lec_arp_lock, flags);
        hlist_for_each_entry_safe(entry, next,
                                  &priv->lec_arp_empty_ones, next) {
                if (vcc == entry->vcc) {
                        del_timer(&entry->timer);
                        ether_addr_copy(entry->mac_addr, src);
                        entry->status = ESI_FORWARD_DIRECT;
                        entry->last_used = jiffies;
                        /* We might have got an entry */
                        tmp = lec_arp_find(priv, src);
                        if (tmp) {
                                lec_arp_remove(priv, tmp);
                                lec_arp_put(tmp);
                        }
                        hlist_del(&entry->next);
                        lec_arp_add(priv, entry);
                        goto out;
                }
        }
        pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
out:
        spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
}

MODULE_LICENSE("GPL");