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lec.c

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

#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 <asm/uaccess.h>
#include <net/arp.h>
#include <net/dst.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>

/* TokenRing if needed */
#ifdef CONFIG_TR
#include <linux/trdevice.h>
#endif

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

/* Proxy LEC knows about bridging */
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
#include <linux/if_bridge.h>
#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>

#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 int lec_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int lec_close(struct net_device *dev);
static struct net_device_stats *lec_get_stats(struct net_device *dev);
static void lec_init(struct net_device *dev);
static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
                                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, u8 *mac_address,
                        u8 *tlvs, u32 sizeoftlvs);
static int lane2_resolve(struct net_device *dev, u8 *dst_mac, int force,
                   u8 **tlvs, u32 *sizeoftlvs);
static int lane2_associate_req(struct net_device *dev, u8 *lan_dst,
                         u8 *tlvs, u32 sizeoftlvs);

static int lec_addr_delete(struct lec_priv *priv, 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,
                               unsigned char *mac_to_find,
                               int is_rdesc,
                               struct lec_arp_table **ret_entry);
static void lec_arp_update(struct lec_priv *priv, unsigned char *mac_addr,
                     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,
                          unsigned char *atm_addr,
                          unsigned long tran_id);
static void lec_vcc_added(struct lec_priv *priv, 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)
{
      atomic_inc(&entry->usage);
}

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


static struct lane2_ops lane2_ops = {
      lane2_resolve,          /* resolve,             spec 3.1.3 */
      lane2_associate_req,    /* associate_req,       spec 3.1.4 */
      NULL              /* associate indicator, 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 defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
{
      struct ethhdr *eth;
      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
       */
      eth = (struct ethhdr *)skb->data;
      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 = (struct lec_priv *)dev->priv;
            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, skb2->len);
      }

      return;
}
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */

/*
 * Modelled after tr_type_trans
 * All multicast and ARE or STE frames go to BUS.
 * Non source routed frames go by destination address.
 * Last hop source routed frames go by destination address.
 * Not last hop source routed frames go by _next_ route descriptor.
 * Returns pointer to destination MAC address or fills in rdesc
 * and returns NULL.
 */
#ifdef CONFIG_TR
static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
{
      struct trh_hdr *trh;
      int riflen, num_rdsc;

      trh = (struct trh_hdr *)packet;
      if (trh->daddr[0] & (uint8_t) 0x80)
            return bus_mac;   /* multicast */

      if (trh->saddr[0] & TR_RII) {
            riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
            if ((ntohs(trh->rcf) >> 13) != 0)
                  return bus_mac;   /* ARE or STE */
      } else
            return trh->daddr;      /* not source routed */

      if (riflen < 6)
            return trh->daddr;      /* last hop, source routed */

      /* riflen is 6 or more, packet has more than one route descriptor */
      num_rdsc = (riflen / 2) - 1;
      memset(rdesc, 0, ETH_ALEN);
      /* offset 4 comes from LAN destination field in LE control frames */
      if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
            memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
      else {
            memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
            rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
      }

      return NULL;
}
#endif /* CONFIG_TR */

/*
 * 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)
{
      struct lec_priv *priv = (struct lec_priv *)dev->priv;

      netif_start_queue(dev);
      memset(&priv->stats, 0, sizeof(struct net_device_stats));

      return 0;
}

static __inline__ void
lec_send(struct atm_vcc *vcc, struct sk_buff *skb, struct lec_priv *priv)
{
      ATM_SKB(skb)->vcc = vcc;
      ATM_SKB(skb)->atm_options = vcc->atm_options;

      atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
      if (vcc->send(vcc, skb) < 0) {
            priv->stats.tx_dropped++;
            return;
      }

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

static void lec_tx_timeout(struct net_device *dev)
{
      printk(KERN_INFO "%s: tx timeout\n", dev->name);
      dev->trans_start = jiffies;
      netif_wake_queue(dev);
}

static int lec_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct sk_buff *skb2;
      struct lec_priv *priv = (struct lec_priv *)dev->priv;
      struct lecdatahdr_8023 *lec_h;
      struct atm_vcc *vcc;
      struct lec_arp_table *entry;
      unsigned char *dst;
      int min_frame_size;
#ifdef CONFIG_TR
      unsigned char rdesc[ETH_ALEN];      /* Token Ring route descriptor */
#endif
      int is_rdesc;
#if DUMP_PACKETS > 0
      char buf[300];
      int i = 0;
#endif /* DUMP_PACKETS >0 */
      DECLARE_MAC_BUF(mac);

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

      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 defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
      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("lec_start_xmit: reallocating skb\n");
            skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
            kfree_skb(skb);
            if (skb2 == NULL)
                  return 0;
            skb = skb2;
      }
      skb_push(skb, 2);

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

#ifdef CONFIG_TR
      /*
       * Ugly. Use this to realign Token Ring packets for
       * e.g. PCA-200E driver.
       */
      if (priv->is_trdev) {
            skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
            kfree_skb(skb);
            if (skb2 == NULL)
                  return 0;
            skb = skb2;
      }
#endif

#if DUMP_PACKETS > 0
      printk("%s: send datalen:%ld lecid:%4.4x\n", dev->name,
             skb->len, priv->lecid);
#if DUMP_PACKETS >= 2
      for (i = 0; i < skb->len && i < 99; i++) {
            sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
      }
#elif DUMP_PACKETS >= 1
      for (i = 0; i < skb->len && i < 30; i++) {
            sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
      }
#endif /* DUMP_PACKETS >= 1 */
      if (i == skb->len)
            printk("%s\n", buf);
      else
            printk("%s...\n", buf);
#endif /* DUMP_PACKETS > 0 */

      /* Minimum ethernet-frame size */
#ifdef CONFIG_TR
      if (priv->is_trdev)
            min_frame_size = LEC_MINIMUM_8025_SIZE;
      else
#endif
            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) {
                        priv->stats.tx_dropped++;
                        return 0;
                  }
                  skb = skb2;
            }
            skb_put(skb, min_frame_size - skb->len);
      }

      /* Send to right vcc */
      is_rdesc = 0;
      dst = lec_h->h_dest;
#ifdef CONFIG_TR
      if (priv->is_trdev) {
            dst = get_tr_dst(skb->data + 2, rdesc);
            if (dst == NULL) {
                  dst = rdesc;
                  is_rdesc = 1;
            }
      }
#endif
      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:lec_start_xmit: queuing packet, ",
                        dev->name);
                  pr_debug("MAC address %s\n",
                         print_mac(mac, lec_h->h_dest));
                  skb_queue_tail(&entry->tx_wait, skb);
            } else {
                  pr_debug
                      ("%s:lec_start_xmit: tx queue full or no arp entry, dropping, ",
                       dev->name);
                  pr_debug("MAC address %s\n",
                         print_mac(mac, lec_h->h_dest));
                  priv->stats.tx_dropped++;
                  dev_kfree_skb(skb);
            }
            goto out;
      }
#if DUMP_PACKETS > 0
      printk("%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("lec.c: emptying tx queue, ");
            pr_debug("MAC address %s\n",
                   print_mac(mac, lec_h->h_dest));
            lec_send(vcc, skb2, priv);
      }

      lec_send(vcc, skb, priv);

      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);
      dev->trans_start = jiffies;
      return 0;
}

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

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *lec_get_stats(struct net_device *dev)
{
      return &((struct lec_priv *)dev->priv)->stats;
}

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 = (struct lec_priv *)dev->priv;
      struct atmlec_msg *mesg;
      struct lec_arp_table *entry;
      int i;
      char *tmp;        /* FIXME */
      DECLARE_MAC_BUF(mac);

      atomic_sub(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("lec: in l_arp_update\n");
            if (mesg->sizeoftlvs != 0) {  /* LANE2 3.1.5 */
                  pr_debug("lec: 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;
            if (dev->change_mtu(dev, mesg->content.config.mtu))
                  printk("%s: change_mtu to %d failed\n", dev->name,
                         mesg->content.config.mtu);
            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 defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
            {
                  struct net_bridge_fdb_entry *f;

                  pr_debug
                      ("%s: bridge zeppelin asks about %s\n",
                       dev->name,
                       print_mac(mac, mesg->content.proxy.mac_addr));

                  if (br_fdb_get_hook == NULL || dev->br_port == NULL)
                        break;

                  f = br_fdb_get_hook(dev->br_port->br,
                                  mesg->content.proxy.mac_addr);
                  if (f != NULL && f->dst->dev != dev
                      && f->dst->state == BR_STATE_FORWARDING) {
                        /* 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) {
                              br_fdb_put_hook(f);
                              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, skb2->len);
                  }
                  if (f != NULL)
                        br_fdb_put_hook(f);
            }
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
            break;
      default:
            printk("%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 = (struct lec_priv *)dev->priv;

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

      netif_stop_queue(dev);
      lec_arp_destroy(priv);

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

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

static 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,
           unsigned char *mac_addr, 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)
            memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
      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, skb->len);

      if (data != NULL) {
            pr_debug("lec: 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, skb->len);
      }

      return 0;
}

/* shamelessly stolen from drivers/net/net_init.c */
static int lec_change_mtu(struct net_device *dev, int new_mtu)
{
      if ((new_mtu < 68) || (new_mtu > 18190))
            return -EINVAL;
      dev->mtu = new_mtu;
      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
       */
      return;
}

static void lec_init(struct net_device *dev)
{
      dev->change_mtu = lec_change_mtu;
      dev->open = lec_open;
      dev->stop = lec_close;
      dev->hard_start_xmit = lec_start_xmit;
      dev->tx_timeout = lec_tx_timeout;

      dev->get_stats = lec_get_stats;
      dev->set_multicast_list = lec_set_multicast_list;
      dev->do_ioctl = NULL;
      printk("%s: Initialized!\n", dev->name);
      return;
}

static 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 = (struct lec_priv *)dev->priv;

#if DUMP_PACKETS >0
      int i = 0;
      char buf[300];

      printk("%s: lec_push 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 > 0
      printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
             skb->len, priv->lecid);
#if DUMP_PACKETS >= 2
      for (i = 0; i < skb->len && i < 99; i++) {
            sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
      }
#elif DUMP_PACKETS >= 1
      for (i = 0; i < skb->len && i < 30; i++) {
            sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
      }
#endif /* DUMP_PACKETS >= 1 */
      if (i == skb->len)
            printk("%s\n", buf);
      else
            printk("%s...\n", buf);
#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, skb->len);
      } 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;
            }
#ifdef CONFIG_TR
            if (priv->is_trdev)
                  dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
            else
#endif
                  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)) {
#ifdef CONFIG_TR
                  if (priv->is_trdev)
                        src =
                            ((struct lecdatahdr_8025 *)skb->data)->
                            h_source;
                  else
#endif
                        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 */
#ifdef CONFIG_TR
            if (priv->is_trdev)
                  skb->protocol = tr_type_trans(skb, dev);
            else
#endif
                  skb->protocol = eth_type_trans(skb, dev);
            priv->stats.rx_packets++;
            priv->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) {
            printk("lec_pop(): 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) {
            printk
                ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
                 bytes_left);
      }
      if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
          !dev_lec[ioc_data.dev_num])
            return -EINVAL;
      if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
            return -ENOMEM;
      vpriv->xoff = 0;
      vpriv->old_pop = vcc->pop;
      vcc->user_back = vpriv;
      vcc->pop = lec_pop;
      lec_vcc_added(dev_lec[ioc_data.dev_num]->priv,
                  &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((struct lec_priv *)dev_lec[arg]->priv, 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;
#ifdef CONFIG_TR
      if (arg >= MAX_LEC_ITF)
            return -EINVAL;
#else                   /* Reserve the top NUM_TR_DEVS for TR */
      if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
            return -EINVAL;
#endif
      if (!dev_lec[i]) {
            int is_trdev, size;

            is_trdev = 0;
            if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
                  is_trdev = 1;

            size = sizeof(struct lec_priv);
#ifdef CONFIG_TR
            if (is_trdev)
                  dev_lec[i] = alloc_trdev(size);
            else
#endif
                  dev_lec[i] = alloc_etherdev(size);
            if (!dev_lec[i])
                  return -ENOMEM;
            snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
            if (register_netdev(dev_lec[i])) {
                  free_netdev(dev_lec[i]);
                  return -EINVAL;
            }

            priv = dev_lec[i]->priv;
            priv->is_trdev = is_trdev;
            lec_init(dev_lec[i]);
      } else {
            priv = dev_lec[i]->priv;
            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 char *lec_arp_get_status_string(unsigned char status)
{
      static char *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;
      struct lec_arp_table *tmp;

      if (!e)
            e = tbl->first;
      if (e == (void *)1) {
            e = tbl->first;
            --*l;
      }

      hlist_for_each_entry_from(tmp, 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 && dev->priv) ? lec_priv_walk(state, l, dev->priv) : 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 = (void *)1;

      return *pos ? lec_get_idx(state, *pos) : (void *)1;
}

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 char lec_banner[] = "Itf  MAC          ATM destination"
          "                          Status            Flags "
          "VPI/VCI Recv VPI/VCI\n";

      if (v == (void *)1)
            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,
};

static int lec_seq_open(struct inode *inode, struct file *file)
{
      struct lec_state *state;
      struct seq_file *seq;
      int rc = -EAGAIN;

      state = kmalloc(sizeof(*state), GFP_KERNEL);
      if (!state) {
            rc = -ENOMEM;
            goto out;
      }

      rc = seq_open(file, &lec_seq_ops);
      if (rc)
            goto out_kfree;
      seq = file->private_data;
      seq->private = state;
out:
      return rc;

out_kfree:
      kfree(state);
      goto out;
}

static int lec_seq_release(struct inode *inode, struct file *file)
{
      return seq_release_private(inode, file);
}

static const struct file_operations lec_seq_fops = {
      .owner = THIS_MODULE,
      .open = lec_seq_open,
      .read = seq_read,
      .llseek = seq_lseek,
      .release = lec_seq_release,
};
#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 = create_proc_entry("lec", S_IRUGO, atm_proc_root);
      if (p)
            p->proc_fops = &lec_seq_fops;
#endif

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

static void __exit lane_module_cleanup(void)
{
      int i;
      struct lec_priv *priv;

      remove_proc_entry("lec", atm_proc_root);

      deregister_atm_ioctl(&lane_ioctl_ops);

      for (i = 0; i < MAX_LEC_ITF; i++) {
            if (dev_lec[i] != NULL) {
                  priv = (struct lec_priv *)dev_lec[i]->priv;
                  unregister_netdev(dev_lec[i]);
                  free_netdev(dev_lec[i]);
                  dev_lec[i] = NULL;
            }
      }

      return;
}

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, u8 *dst_mac, int force,
                   u8 **tlvs, u32 *sizeoftlvs)
{
      unsigned long flags;
      struct lec_priv *priv = (struct lec_priv *)dev->priv;
      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, u8 *lan_dst,
                         u8 *tlvs, u32 sizeoftlvs)
{
      int retval;
      struct sk_buff *skb;
      struct lec_priv *priv = (struct lec_priv *)dev->priv;

      if (compare_ether_addr(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)
            printk("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, u8 *mac_addr,
                        u8 *tlvs, u32 sizeoftlvs)
{
#if 0
      int i = 0;
#endif
      struct lec_priv *priv = (struct lec_priv *)dev->priv;
#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
      printk("lec.c: lane2_associate_ind()\n");
      printk("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
      while (i < sizeoftlvs)
            printk("%02x ", tlvs[i++]);

      printk("\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);
      }
      return;
}

/*
 * 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 <asm/param.h>
#include <asm/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(unsigned long data);

/*
 * 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("LEC_ARP: Added entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
            0xff & entry->mac_addr[0], 0xff & entry->mac_addr[1],
            0xff & entry->mac_addr[2], 0xff & entry->mac_addr[3],
            0xff & entry->mac_addr[4], 0xff & entry->mac_addr[5]);
}

/*
 * Remove entry from lec_arp_table
 */
static int
lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
{
      struct hlist_node *node;
      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, node, &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("LEC_ARP: Removed entry:%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
            0xff & to_remove->mac_addr[0], 0xff & to_remove->mac_addr[1],
            0xff & to_remove->mac_addr[2], 0xff & to_remove->mac_addr[3],
            0xff & to_remove->mac_addr[4], 0xff & to_remove->mac_addr[5]);
      return 0;
}

#if DEBUG_ARP_TABLE
static 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";
      default:
            return "<UNKNOWN>";
      }
}

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

      printk("Dump %p:\n", priv);
      for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
            hlist_for_each_entry(rulla, node, &priv->lec_arp_tables[i], next) {
                  offset = 0;
                  offset += sprintf(buf, "%d: %p\n", i, rulla);
                  offset += sprintf(buf + offset, "Mac:");
                  for (j = 0; j < ETH_ALEN; j++) {
                        offset += sprintf(buf + offset,
                                      "%2.2x ",
                                      rulla->mac_addr[j] & 0xff);
                  }
                  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));
                  printk("%s\n", buf);
            }
      }

      if (!hlist_empty(&priv->lec_no_forward))
            printk("No forward\n");
      hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
            offset = 0;
            offset += sprintf(buf + offset, "Mac:");
            for (j = 0; j < ETH_ALEN; j++) {
                  offset += sprintf(buf + offset, "%2.2x ",
                                rulla->mac_addr[j] & 0xff);
            }
            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));
            printk("%s\n", buf);
      }

      if (!hlist_empty(&priv->lec_arp_empty_ones))
            printk("Empty ones\n");
      hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
            offset = 0;
            offset += sprintf(buf + offset, "Mac:");
            for (j = 0; j < ETH_ALEN; j++) {
                  offset += sprintf(buf + offset, "%2.2x ",
                                rulla->mac_addr[j] & 0xff);
            }
            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));
            printk("%s", buf);
      }

      if (!hlist_empty(&priv->mcast_fwds))
            printk("Multicast Forward VCCs\n");
      hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
            offset = 0;
            offset += sprintf(buf + offset, "Mac:");
            for (j = 0; j < ETH_ALEN; j++) {
                  offset += sprintf(buf + offset, "%2.2x ",
                                rulla->mac_addr[j] & 0xff);
            }
            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));
            printk("%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 *node, *next;
      struct lec_arp_table *entry;
      int i;

      cancel_rearming_delayed_work(&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, node, 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, node, 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, node, 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, node, 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,
                                unsigned char *mac_addr)
{
      struct hlist_node *node;
      struct hlist_head *head;
      struct lec_arp_table *entry;

      pr_debug("LEC_ARP: lec_arp_find :%2.2x %2.2x %2.2x %2.2x %2.2x %2.2x\n",
            mac_addr[0] & 0xff, mac_addr[1] & 0xff, mac_addr[2] & 0xff,
            mac_addr[3] & 0xff, mac_addr[4] & 0xff, mac_addr[5] & 0xff);

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

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

      to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
      if (!to_return) {
            printk("LEC: Arp entry kmalloc failed\n");
            return NULL;
      }
      memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
      INIT_HLIST_NODE(&to_return->next);
      init_timer(&to_return->timer);
      to_return->timer.function = lec_arp_expire_arp;
      to_return->timer.data = (unsigned long)to_return;
      to_return->last_used = jiffies;
      to_return->priv = priv;
      skb_queue_head_init(&to_return->tx_wait);
      atomic_set(&to_return->usage, 1);
      return to_return;
}

/* Arp sent timer expired */
static void lec_arp_expire_arp(unsigned long data)
{
      struct lec_arp_table *entry;

      entry = (struct lec_arp_table *)data;

      pr_debug("lec_arp_expire_arp\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(unsigned long data)
{
      unsigned long flags;
      struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
      struct lec_priv *priv = (struct lec_priv *)to_remove->priv;

      del_timer(&to_remove->timer);

      pr_debug("LEC_ARP %p %p: lec_arp_expire_vcc 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);
}

/*
 * 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 *node, *next;
      struct lec_arp_table *entry;
      unsigned long now;
      unsigned long time_to_check;
      int i;

      pr_debug("lec_arp_check_expire %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, node, next, &priv->lec_arp_tables[i], next) {
                  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("LEC: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)) {
                              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)) != NULL)
                                    lec_send(vcc, skb, entry->priv);
                              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,
                               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;
                  break;
            case 2:     /* LANE2 wants arp for multicast addresses */
                  if (!compare_ether_addr(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("LEC_ARP: 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("lec: 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("LEC_ARP: 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, unsigned char *atm_addr,
            unsigned long permanent)
{
      unsigned long flags;
      struct hlist_node *node, *next;
      struct lec_arp_table *entry;
      int i;

      pr_debug("lec_addr_delete\n");
      spin_lock_irqsave(&priv->lec_arp_lock, flags);
      for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
            hlist_for_each_entry_safe(entry, node, 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, unsigned char *mac_addr,
             unsigned char *atm_addr, unsigned long remoteflag,
             unsigned int targetless_le_arp)
{
      unsigned long flags;
      struct hlist_node *node, *next;
      struct lec_arp_table *entry, *tmp;
      int i;

      pr_debug("lec:%s", (targetless_le_arp) ? "targetless " : " ");
      pr_debug("lec_arp_update mac:%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
            mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3],
            mac_addr[4], mac_addr[5]);

      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, node, 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;
                              memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
                              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, node, &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, struct atmlec_ioc *ioc_data,
            struct atm_vcc *vcc,
            void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
{
      unsigned long flags;
      struct hlist_node *node;
      struct lec_arp_table *entry;
      int i, found_entry = 0;

      spin_lock_irqsave(&priv->lec_arp_lock, flags);
      if (ioc_data->receive == 2) {
            /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */

            pr_debug("LEC_ARP: Attaching mcast forward\n");
#if 0
            entry = lec_arp_find(priv, bus_mac);
            if (!entry) {
                  printk("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);
            memset(entry->mac_addr, 0, ETH_ALEN);
            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, node, &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);
      memset(entry->mac_addr, 0, ETH_ALEN);
      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 hlist_node *node;
      struct lec_arp_table *entry;
      int i;

      pr_debug("LEC:lec_flush_complete %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, node, &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)) != NULL)
                              lec_send(vcc, skb, entry->priv);
                        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,
                  unsigned char *atm_addr, unsigned long tran_id)
{
      unsigned long flags;
      struct hlist_node *node;
      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, node, &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;

      if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
            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 *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, node, 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, node, 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, node, 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, node, 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 *node, *next;
      struct lec_arp_table *entry, *tmp;
      struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
      unsigned char *src;
#ifdef CONFIG_TR
      struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;

      if (priv->is_trdev)
            src = tr_hdr->h_source;
      else
#endif
            src = hdr->h_source;

      spin_lock_irqsave(&priv->lec_arp_lock, flags);
      hlist_for_each_entry_safe(entry, node, next, &priv->lec_arp_empty_ones, next) {
            if (vcc == entry->vcc) {
                  del_timer(&entry->timer);
                  memcpy(entry->mac_addr, src, ETH_ALEN);
                  entry->status = ESI_FORWARD_DIRECT;
                  entry->last_used = jiffies;
                  /* We might have got an entry */
                  if ((tmp = lec_arp_find(priv, src))) {
                        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");

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