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irlan_common.c

/*********************************************************************
 *
 * Filename:      irlan_common.c
 * Version:       0.9
 * Description:   IrDA LAN Access Protocol Implementation
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 31 20:14:37 1997
 * Modified at:   Sun Dec 26 21:53:10 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1997, 1999 Dag Brattli <dagb@cs.uit.no>,
 *     All Rights Reserved.
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/random.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/moduleparam.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/byteorder.h>

#include <net/irda/irda.h>
#include <net/irda/irttp.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/timer.h>

#include <net/irda/irlan_common.h>
#include <net/irda/irlan_client.h>
#include <net/irda/irlan_provider.h>
#include <net/irda/irlan_eth.h>
#include <net/irda/irlan_filter.h>


/*
 * Send gratuitous ARP when connected to a new AP or not. May be a clever
 * thing to do, but for some reason the machine crashes if you use DHCP. So
 * lets not use it by default.
 */
#undef CONFIG_IRLAN_SEND_GRATUITOUS_ARP

/* extern char sysctl_devname[]; */

/*
 *  Master structure
 */
static LIST_HEAD(irlans);

static void *ckey;
static void *skey;

/* Module parameters */
static int eth;   /* Use "eth" or "irlan" name for devices */
static int access = ACCESS_PEER; /* PEER, DIRECT or HOSTED */

#ifdef CONFIG_PROC_FS
static const char *irlan_access[] = {
      "UNKNOWN",
      "DIRECT",
      "PEER",
      "HOSTED"
};

static const char *irlan_media[] = {
      "UNKNOWN",
      "802.3",
      "802.5"
};

extern struct proc_dir_entry *proc_irda;

static int irlan_seq_open(struct inode *inode, struct file *file);

static const struct file_operations irlan_fops = {
      .owner       = THIS_MODULE,
      .open    = irlan_seq_open,
      .read    = seq_read,
      .llseek  = seq_lseek,
      .release = seq_release,
};

extern struct proc_dir_entry *proc_irda;
#endif /* CONFIG_PROC_FS */

static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr);
static void __irlan_close(struct irlan_cb *self);
static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
                        __u8 value_byte, __u16 value_short,
                        __u8 *value_array, __u16 value_len);
static void irlan_open_unicast_addr(struct irlan_cb *self);
static void irlan_get_unicast_addr(struct irlan_cb *self);
void irlan_close_tsaps(struct irlan_cb *self);

/*
 * Function irlan_init (void)
 *
 *    Initialize IrLAN layer
 *
 */
static int __init irlan_init(void)
{
      struct irlan_cb *new;
      __u16 hints;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

#ifdef CONFIG_PROC_FS
      { struct proc_dir_entry *proc;
      proc = create_proc_entry("irlan", 0, proc_irda);
      if (!proc) {
            printk(KERN_ERR "irlan_init: can't create /proc entry!\n");
            return -ENODEV;
      }

      proc->proc_fops = &irlan_fops;
      }
#endif /* CONFIG_PROC_FS */

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
      hints = irlmp_service_to_hint(S_LAN);

      /* Register with IrLMP as a client */
      ckey = irlmp_register_client(hints, &irlan_client_discovery_indication,
                             NULL, NULL);
      if (!ckey)
            goto err_ckey;

      /* Register with IrLMP as a service */
      skey = irlmp_register_service(hints);
      if (!skey)
            goto err_skey;

      /* Start the master IrLAN instance (the only one for now) */
      new = irlan_open(DEV_ADDR_ANY, DEV_ADDR_ANY);
      if (!new)
            goto err_open;

      /* The master will only open its (listen) control TSAP */
      irlan_provider_open_ctrl_tsap(new);

      /* Do some fast discovery! */
      irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);

      return 0;

err_open:
      irlmp_unregister_service(skey);
err_skey:
      irlmp_unregister_client(ckey);
err_ckey:
#ifdef CONFIG_PROC_FS
      remove_proc_entry("irlan", proc_irda);
#endif /* CONFIG_PROC_FS */

      return -ENOMEM;
}

static void __exit irlan_cleanup(void)
{
      struct irlan_cb *self, *next;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      irlmp_unregister_client(ckey);
      irlmp_unregister_service(skey);

#ifdef CONFIG_PROC_FS
      remove_proc_entry("irlan", proc_irda);
#endif /* CONFIG_PROC_FS */

      /* Cleanup any leftover network devices */
      rtnl_lock();
      list_for_each_entry_safe(self, next, &irlans, dev_list) {
            __irlan_close(self);
      }
      rtnl_unlock();
}

/*
 * Function irlan_open (void)
 *
 *    Open new instance of a client/provider, we should only register the
 *    network device if this instance is ment for a particular client/provider
 */
static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr)
{
      struct net_device *dev;
      struct irlan_cb *self;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      /* Create network device with irlan */
      dev = alloc_irlandev(eth ? "eth%d" : "irlan%d");
      if (!dev)
            return NULL;

      self = dev->priv;
      self->dev = dev;

      /*
       *  Initialize local device structure
       */
      self->magic = IRLAN_MAGIC;
      self->saddr = saddr;
      self->daddr = daddr;

      /* Provider access can only be PEER, DIRECT, or HOSTED */
      self->provider.access_type = access;
      if (access == ACCESS_DIRECT) {
            /*
             * Since we are emulating an IrLAN sever we will have to
             * give ourself an ethernet address!
             */
            dev->dev_addr[0] = 0x40;
            dev->dev_addr[1] = 0x00;
            dev->dev_addr[2] = 0x00;
            dev->dev_addr[3] = 0x00;
            get_random_bytes(dev->dev_addr+4, 1);
            get_random_bytes(dev->dev_addr+5, 1);
      }

      self->media = MEDIA_802_3;
      self->disconnect_reason = LM_USER_REQUEST;
      init_timer(&self->watchdog_timer);
      init_timer(&self->client.kick_timer);
      init_waitqueue_head(&self->open_wait);

      skb_queue_head_init(&self->client.txq);

      irlan_next_client_state(self, IRLAN_IDLE);
      irlan_next_provider_state(self, IRLAN_IDLE);

      if (register_netdev(dev)) {
            IRDA_DEBUG(2, "%s(), register_netdev() failed!\n",
                     __FUNCTION__ );
            self = NULL;
            free_netdev(dev);
      } else {
            rtnl_lock();
            list_add_rcu(&self->dev_list, &irlans);
            rtnl_unlock();
      }

      return self;
}
/*
 * Function __irlan_close (self)
 *
 *    This function closes and deallocates the IrLAN client instances. Be
 *    aware that other functions which calls client_close() must
 *    remove self from irlans list first.
 */
static void __irlan_close(struct irlan_cb *self)
{
      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      ASSERT_RTNL();
      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      del_timer_sync(&self->watchdog_timer);
      del_timer_sync(&self->client.kick_timer);

      /* Close all open connections and remove TSAPs */
      irlan_close_tsaps(self);

      if (self->client.iriap)
            iriap_close(self->client.iriap);

      /* Remove frames queued on the control channel */
      skb_queue_purge(&self->client.txq);

      /* Unregister and free self via destructor */
      unregister_netdevice(self->dev);
}

/* Find any instance of irlan, used for client discovery wakeup */
struct irlan_cb *irlan_get_any(void)
{
      struct irlan_cb *self;

      list_for_each_entry_rcu(self, &irlans, dev_list) {
            return self;
      }
      return NULL;
}

/*
 * Function irlan_connect_indication (instance, sap, qos, max_sdu_size, skb)
 *
 *    Here we receive the connect indication for the data channel
 *
 */
static void irlan_connect_indication(void *instance, void *sap,
                             struct qos_info *qos,
                             __u32 max_sdu_size,
                             __u8 max_header_size,
                             struct sk_buff *skb)
{
      struct irlan_cb *self;
      struct tsap_cb *tsap;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      self = (struct irlan_cb *) instance;
      tsap = (struct tsap_cb *) sap;

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
      IRDA_ASSERT(tsap == self->tsap_data,return;);

      self->max_sdu_size = max_sdu_size;
      self->max_header_size = max_header_size;

      IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);

      del_timer(&self->watchdog_timer);

      /* If you want to pass the skb to *both* state machines, you will
       * need to skb_clone() it, so that you don't free it twice.
       * As the state machines don't need it, git rid of it here...
       * Jean II */
      if (skb)
            dev_kfree_skb(skb);

      irlan_do_provider_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
      irlan_do_client_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);

      if (self->provider.access_type == ACCESS_PEER) {
            /*
             * Data channel is open, so we are now allowed to
             * configure the remote filter
             */
            irlan_get_unicast_addr(self);
            irlan_open_unicast_addr(self);
      }
      /* Ready to transfer Ethernet frames (at last) */
      netif_start_queue(self->dev); /* Clear reason */
}

static void irlan_connect_confirm(void *instance, void *sap,
                          struct qos_info *qos,
                          __u32 max_sdu_size,
                          __u8 max_header_size,
                          struct sk_buff *skb)
{
      struct irlan_cb *self;

      self = (struct irlan_cb *) instance;

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      self->max_sdu_size = max_sdu_size;
      self->max_header_size = max_header_size;

      /* TODO: we could set the MTU depending on the max_sdu_size */

      IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);
      del_timer(&self->watchdog_timer);

      /*
       * Data channel is open, so we are now allowed to configure the remote
       * filter
       */
      irlan_get_unicast_addr(self);
      irlan_open_unicast_addr(self);

      /* Open broadcast and multicast filter by default */
      irlan_set_broadcast_filter(self, TRUE);
      irlan_set_multicast_filter(self, TRUE);

      /* Ready to transfer Ethernet frames */
      netif_start_queue(self->dev);
      self->disconnect_reason = 0; /* Clear reason */
#ifdef CONFIG_IRLAN_SEND_GRATUITOUS_ARP
      irlan_eth_send_gratuitous_arp(&self->dev);
#endif
      wake_up_interruptible(&self->open_wait);
}

/*
 * Function irlan_client_disconnect_indication (handle)
 *
 *    Callback function for the IrTTP layer. Indicates a disconnection of
 *    the specified connection (handle)
 */
static void irlan_disconnect_indication(void *instance,
                              void *sap, LM_REASON reason,
                              struct sk_buff *userdata)
{
      struct irlan_cb *self;
      struct tsap_cb *tsap;

      IRDA_DEBUG(0, "%s(), reason=%d\n", __FUNCTION__ , reason);

      self = (struct irlan_cb *) instance;
      tsap = (struct tsap_cb *) sap;

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
      IRDA_ASSERT(tsap != NULL, return;);
      IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);

      IRDA_ASSERT(tsap == self->tsap_data, return;);

      IRDA_DEBUG(2, "IrLAN, data channel disconnected by peer!\n");

      /* Save reason so we know if we should try to reconnect or not */
      self->disconnect_reason = reason;

      switch (reason) {
      case LM_USER_REQUEST: /* User request */
            IRDA_DEBUG(2, "%s(), User requested\n", __FUNCTION__ );
            break;
      case LM_LAP_DISCONNECT: /* Unexpected IrLAP disconnect */
            IRDA_DEBUG(2, "%s(), Unexpected IrLAP disconnect\n", __FUNCTION__ );
            break;
      case LM_CONNECT_FAILURE: /* Failed to establish IrLAP connection */
            IRDA_DEBUG(2, "%s(), IrLAP connect failed\n", __FUNCTION__ );
            break;
      case LM_LAP_RESET:  /* IrLAP reset */
            IRDA_DEBUG(2, "%s(), IrLAP reset\n", __FUNCTION__ );
            break;
      case LM_INIT_DISCONNECT:
            IRDA_DEBUG(2, "%s(), IrLMP connect failed\n", __FUNCTION__ );
            break;
      default:
            IRDA_ERROR("%s(), Unknown disconnect reason\n", __FUNCTION__);
            break;
      }

      /* If you want to pass the skb to *both* state machines, you will
       * need to skb_clone() it, so that you don't free it twice.
       * As the state machines don't need it, git rid of it here...
       * Jean II */
      if (userdata)
            dev_kfree_skb(userdata);

      irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
      irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);

      wake_up_interruptible(&self->open_wait);
}

void irlan_open_data_tsap(struct irlan_cb *self)
{
      struct tsap_cb *tsap;
      notify_t notify;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      /* Check if already open */
      if (self->tsap_data)
            return;

      irda_notify_init(&notify);

      notify.data_indication       = irlan_eth_receive;
      notify.udata_indication      = irlan_eth_receive;
      notify.connect_indication    = irlan_connect_indication;
      notify.connect_confirm       = irlan_connect_confirm;
      notify.flow_indication       = irlan_eth_flow_indication;
      notify.disconnect_indication = irlan_disconnect_indication;
      notify.instance              = self;
      strlcpy(notify.name, "IrLAN data", sizeof(notify.name));

      tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, &notify);
      if (!tsap) {
            IRDA_DEBUG(2, "%s(), Got no tsap!\n", __FUNCTION__ );
            return;
      }
      self->tsap_data = tsap;

      /*
       *  This is the data TSAP selector which we will pass to the client
       *  when the client ask for it.
       */
      self->stsap_sel_data = self->tsap_data->stsap_sel;
}

void irlan_close_tsaps(struct irlan_cb *self)
{
      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      /* Disconnect and close all open TSAP connections */
      if (self->tsap_data) {
            irttp_disconnect_request(self->tsap_data, NULL, P_NORMAL);
            irttp_close_tsap(self->tsap_data);
            self->tsap_data = NULL;
      }
      if (self->client.tsap_ctrl) {
            irttp_disconnect_request(self->client.tsap_ctrl, NULL,
                               P_NORMAL);
            irttp_close_tsap(self->client.tsap_ctrl);
            self->client.tsap_ctrl = NULL;
      }
      if (self->provider.tsap_ctrl) {
            irttp_disconnect_request(self->provider.tsap_ctrl, NULL,
                               P_NORMAL);
            irttp_close_tsap(self->provider.tsap_ctrl);
            self->provider.tsap_ctrl = NULL;
      }
      self->disconnect_reason = LM_USER_REQUEST;
}

/*
 * Function irlan_ias_register (self, tsap_sel)
 *
 *    Register with LM-IAS
 *
 */
void irlan_ias_register(struct irlan_cb *self, __u8 tsap_sel)
{
      struct ias_object *obj;
      struct ias_value *new_value;

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      /*
       * Check if object has already been registered by a previous provider.
       * If that is the case, we just change the value of the attribute
       */
      if (!irias_find_object("IrLAN")) {
            obj = irias_new_object("IrLAN", IAS_IRLAN_ID);
            irias_add_integer_attrib(obj, "IrDA:TinyTP:LsapSel", tsap_sel,
                               IAS_KERNEL_ATTR);
            irias_insert_object(obj);
      } else {
            new_value = irias_new_integer_value(tsap_sel);
            irias_object_change_attribute("IrLAN", "IrDA:TinyTP:LsapSel",
                                    new_value);
      }

      /* Register PnP object only if not registered before */
      if (!irias_find_object("PnP")) {
            obj = irias_new_object("PnP", IAS_PNP_ID);
#if 0
            irias_add_string_attrib(obj, "Name", sysctl_devname,
                              IAS_KERNEL_ATTR);
#else
            irias_add_string_attrib(obj, "Name", "Linux", IAS_KERNEL_ATTR);
#endif
            irias_add_string_attrib(obj, "DeviceID", "HWP19F0",
                              IAS_KERNEL_ATTR);
            irias_add_integer_attrib(obj, "CompCnt", 1, IAS_KERNEL_ATTR);
            if (self->provider.access_type == ACCESS_PEER)
                  irias_add_string_attrib(obj, "Comp#01", "PNP8389",
                                    IAS_KERNEL_ATTR);
            else
                  irias_add_string_attrib(obj, "Comp#01", "PNP8294",
                                    IAS_KERNEL_ATTR);

            irias_add_string_attrib(obj, "Manufacturer",
                              "Linux-IrDA Project", IAS_KERNEL_ATTR);
            irias_insert_object(obj);
      }
}

/*
 * Function irlan_run_ctrl_tx_queue (self)
 *
 *    Try to send the next command in the control transmit queue
 *
 */
int irlan_run_ctrl_tx_queue(struct irlan_cb *self)
{
      struct sk_buff *skb;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      if (irda_lock(&self->client.tx_busy) == FALSE)
            return -EBUSY;

      skb = skb_dequeue(&self->client.txq);
      if (!skb) {
            self->client.tx_busy = FALSE;
            return 0;
      }

      /* Check that it's really possible to send commands */
      if ((self->client.tsap_ctrl == NULL) ||
          (self->client.state == IRLAN_IDLE))
      {
            self->client.tx_busy = FALSE;
            dev_kfree_skb(skb);
            return -1;
      }
      IRDA_DEBUG(2, "%s(), sending ...\n", __FUNCTION__ );

      return irttp_data_request(self->client.tsap_ctrl, skb);
}

/*
 * Function irlan_ctrl_data_request (self, skb)
 *
 *    This function makes sure that commands on the control channel is being
 *    sent in a command/response fashion
 */
static void irlan_ctrl_data_request(struct irlan_cb *self, struct sk_buff *skb)
{
      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      /* Queue command */
      skb_queue_tail(&self->client.txq, skb);

      /* Try to send command */
      irlan_run_ctrl_tx_queue(self);
}

/*
 * Function irlan_get_provider_info (self)
 *
 *    Send Get Provider Information command to peer IrLAN layer
 *
 */
void irlan_get_provider_info(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER,
                  GFP_ATOMIC);
      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      frame[0] = CMD_GET_PROVIDER_INFO;
      frame[1] = 0x00;                 /* Zero parameters */

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_open_data_channel (self)
 *
 *    Send an Open Data Command to provider
 *
 */
void irlan_open_data_channel(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3") +
                  IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "DIRECT"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      /* Build frame */
      frame[0] = CMD_OPEN_DATA_CHANNEL;
      frame[1] = 0x02; /* Two parameters */

      irlan_insert_string_param(skb, "MEDIA", "802.3");
      irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
      /* irlan_insert_string_param(skb, "MODE", "UNRELIABLE"); */

/*    self->use_udata = TRUE; */

      irlan_ctrl_data_request(self, skb);
}

void irlan_close_data_channel(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      /* Check if the TSAP is still there */
      if (self->client.tsap_ctrl == NULL)
            return;

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      /* Build frame */
      frame[0] = CMD_CLOSE_DATA_CHAN;
      frame[1] = 0x01; /* One parameter */

      irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_open_unicast_addr (self)
 *
 *    Make IrLAN provider accept ethernet frames addressed to the unicast
 *    address.
 *
 */
static void irlan_open_unicast_addr(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      frame[0] = CMD_FILTER_OPERATION;
      frame[1] = 0x03;                 /* Three parameters */
      irlan_insert_byte_param(skb, "DATA_CHAN" , self->dtsap_sel_data);
      irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
      irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_set_broadcast_filter (self, status)
 *
 *    Make IrLAN provider accept ethernet frames addressed to the broadcast
 *    address. Be careful with the use of this one, since there may be a lot
 *    of broadcast traffic out there. We can still function without this
 *    one but then _we_ have to initiate all communication with other
 *    hosts, since ARP request for this host will not be answered.
 */
void irlan_set_broadcast_filter(struct irlan_cb *self, int status)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BROADCAST") +
                  /* We may waste one byte here...*/
                  IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      frame[0] = CMD_FILTER_OPERATION;
      frame[1] = 0x03;                 /* Three parameters */
      irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
      irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
      if (status)
            irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
      else
            irlan_insert_string_param(skb, "FILTER_MODE", "NONE");

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_set_multicast_filter (self, status)
 *
 *    Make IrLAN provider accept ethernet frames addressed to the multicast
 *    address.
 *
 */
void irlan_set_multicast_filter(struct irlan_cb *self, int status)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
                  /* We may waste one byte here...*/
                  IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "NONE"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      frame[0] = CMD_FILTER_OPERATION;
      frame[1] = 0x03;                 /* Three parameters */
      irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
      irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
      if (status)
            irlan_insert_string_param(skb, "FILTER_MODE", "ALL");
      else
            irlan_insert_string_param(skb, "FILTER_MODE", "NONE");

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_get_unicast_addr (self)
 *
 *    Retrieves the unicast address from the IrLAN provider. This address
 *    will be inserted into the devices structure, so the ethernet layer
 *    can construct its packets.
 *
 */
static void irlan_get_unicast_addr(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
                  IRLAN_STRING_PARAMETER_LEN("FILTER_OPERATION",
                                       "DYNAMIC"),
                  GFP_ATOMIC);
      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      frame[0] = CMD_FILTER_OPERATION;
      frame[1] = 0x03;                 /* Three parameters */
      irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
      irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
      irlan_insert_string_param(skb, "FILTER_OPERATION", "DYNAMIC");

      irlan_ctrl_data_request(self, skb);
}

/*
 * Function irlan_get_media_char (self)
 *
 *
 *
 */
void irlan_get_media_char(struct irlan_cb *self)
{
      struct sk_buff *skb;
      __u8 *frame;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);

      skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
                  IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3"),
                  GFP_ATOMIC);

      if (!skb)
            return;

      /* Reserve space for TTP, LMP, and LAP header */
      skb_reserve(skb, self->client.max_header_size);
      skb_put(skb, 2);

      frame = skb->data;

      /* Build frame */
      frame[0] = CMD_GET_MEDIA_CHAR;
      frame[1] = 0x01; /* One parameter */

      irlan_insert_string_param(skb, "MEDIA", "802.3");
      irlan_ctrl_data_request(self, skb);
}

/*
 * Function insert_byte_param (skb, param, value)
 *
 *    Insert byte parameter into frame
 *
 */
int irlan_insert_byte_param(struct sk_buff *skb, char *param, __u8 value)
{
      return __irlan_insert_param(skb, param, IRLAN_BYTE, value, 0, NULL, 0);
}

int irlan_insert_short_param(struct sk_buff *skb, char *param, __u16 value)
{
      return __irlan_insert_param(skb, param, IRLAN_SHORT, 0, value, NULL, 0);
}

/*
 * Function insert_string (skb, param, value)
 *
 *    Insert string parameter into frame
 *
 */
int irlan_insert_string_param(struct sk_buff *skb, char *param, char *string)
{
      int string_len = strlen(string);

      return __irlan_insert_param(skb, param, IRLAN_ARRAY, 0, 0, string,
                            string_len);
}

/*
 * Function insert_array_param(skb, param, value, len_value)
 *
 *    Insert array parameter into frame
 *
 */
int irlan_insert_array_param(struct sk_buff *skb, char *name, __u8 *array,
                       __u16 array_len)
{
      return __irlan_insert_param(skb, name, IRLAN_ARRAY, 0, 0, array,
                            array_len);
}

/*
 * Function insert_param (skb, param, value, byte)
 *
 *    Insert parameter at end of buffer, structure of a parameter is:
 *
 *    -----------------------------------------------------------------------
 *    | Name Length[1] | Param Name[1..255] | Val Length[2] | Value[0..1016]|
 *    -----------------------------------------------------------------------
 */
static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
                        __u8 value_byte, __u16 value_short,
                        __u8 *value_array, __u16 value_len)
{
      __u8 *frame;
      __u8 param_len;
      __le16 tmp_le; /* Temporary value in little endian format */
      int n=0;

      if (skb == NULL) {
            IRDA_DEBUG(2, "%s(), Got NULL skb\n", __FUNCTION__ );
            return 0;
      }

      param_len = strlen(param);
      switch (type) {
      case IRLAN_BYTE:
            value_len = 1;
            break;
      case IRLAN_SHORT:
            value_len = 2;
            break;
      case IRLAN_ARRAY:
            IRDA_ASSERT(value_array != NULL, return 0;);
            IRDA_ASSERT(value_len > 0, return 0;);
            break;
      default:
            IRDA_DEBUG(2, "%s(), Unknown parameter type!\n", __FUNCTION__ );
            return 0;
            break;
      }

      /* Insert at end of sk-buffer */
      frame = skb_tail_pointer(skb);

      /* Make space for data */
      if (skb_tailroom(skb) < (param_len+value_len+3)) {
            IRDA_DEBUG(2, "%s(), No more space at end of skb\n", __FUNCTION__ );
            return 0;
      }
      skb_put(skb, param_len+value_len+3);

      /* Insert parameter length */
      frame[n++] = param_len;

      /* Insert parameter */
      memcpy(frame+n, param, param_len); n += param_len;

      /* Insert value length (2 byte little endian format, LSB first) */
      tmp_le = cpu_to_le16(value_len);
      memcpy(frame+n, &tmp_le, 2); n += 2; /* To avoid alignment problems */

      /* Insert value */
      switch (type) {
      case IRLAN_BYTE:
            frame[n++] = value_byte;
            break;
      case IRLAN_SHORT:
            tmp_le = cpu_to_le16(value_short);
            memcpy(frame+n, &tmp_le, 2); n += 2;
            break;
      case IRLAN_ARRAY:
            memcpy(frame+n, value_array, value_len); n+=value_len;
            break;
      default:
            break;
      }
      IRDA_ASSERT(n == (param_len+value_len+3), return 0;);

      return param_len+value_len+3;
}

/*
 * Function irlan_extract_param (buf, name, value, len)
 *
 *    Extracts a single parameter name/value pair from buffer and updates
 *    the buffer pointer to point to the next name/value pair.
 */
int irlan_extract_param(__u8 *buf, char *name, char *value, __u16 *len)
{
      __u8 name_len;
      __u16 val_len;
      int n=0;

      IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

      /* get length of parameter name (1 byte) */
      name_len = buf[n++];

      if (name_len > 254) {
            IRDA_DEBUG(2, "%s(), name_len > 254\n", __FUNCTION__ );
            return -RSP_INVALID_COMMAND_FORMAT;
      }

      /* get parameter name */
      memcpy(name, buf+n, name_len);
      name[name_len] = '\0';
      n+=name_len;

      /*
       *  Get length of parameter value (2 bytes in little endian
       *  format)
       */
      memcpy(&val_len, buf+n, 2); /* To avoid alignment problems */
      le16_to_cpus(&val_len); n+=2;

      if (val_len > 1016) {
            IRDA_DEBUG(2, "%s(), parameter length to long\n", __FUNCTION__ );
            return -RSP_INVALID_COMMAND_FORMAT;
      }
      *len = val_len;

      /* get parameter value */
      memcpy(value, buf+n, val_len);
      value[val_len] = '\0';
      n+=val_len;

      IRDA_DEBUG(4, "Parameter: %s ", name);
      IRDA_DEBUG(4, "Value: %s\n", value);

      return n;
}

#ifdef CONFIG_PROC_FS

/*
 * Start of reading /proc entries.
 * Return entry at pos,
 *    or start_token to indicate print header line
 *    or NULL if end of file
 */
static void *irlan_seq_start(struct seq_file *seq, loff_t *pos)
{
      int i = 1;
      struct irlan_cb *self;

      rcu_read_lock();
      if (*pos == 0)
            return SEQ_START_TOKEN;

      list_for_each_entry(self, &irlans, dev_list) {
            if (*pos == i)
                  return self;
            ++i;
      }
      return NULL;
}

/* Return entry after v, and increment pos */
static void *irlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
      struct list_head *nxt;

      ++*pos;
      if (v == SEQ_START_TOKEN)
            nxt = irlans.next;
      else
            nxt = ((struct irlan_cb *)v)->dev_list.next;

      return (nxt == &irlans) ? NULL
            : list_entry(nxt, struct irlan_cb, dev_list);
}

/* End of reading /proc file */
static void irlan_seq_stop(struct seq_file *seq, void *v)
{
      rcu_read_unlock();
}


/*
 * Show one entry in /proc file.
 */
static int irlan_seq_show(struct seq_file *seq, void *v)
{
      if (v == SEQ_START_TOKEN)
            seq_puts(seq, "IrLAN instances:\n");
      else {
            struct irlan_cb *self = v;

            IRDA_ASSERT(self != NULL, return -1;);
            IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);

            seq_printf(seq,"ifname: %s,\n",
                         self->dev->name);
            seq_printf(seq,"client state: %s, ",
                         irlan_state[ self->client.state]);
            seq_printf(seq,"provider state: %s,\n",
                         irlan_state[ self->provider.state]);
            seq_printf(seq,"saddr: %#08x, ",
                         self->saddr);
            seq_printf(seq,"daddr: %#08x\n",
                         self->daddr);
            seq_printf(seq,"version: %d.%d,\n",
                         self->version[1], self->version[0]);
            seq_printf(seq,"access type: %s\n",
                         irlan_access[self->client.access_type]);
            seq_printf(seq,"media: %s\n",
                         irlan_media[self->media]);

            seq_printf(seq,"local filter:\n");
            seq_printf(seq,"remote filter: ");
            irlan_print_filter(seq, self->client.filter_type);
            seq_printf(seq,"tx busy: %s\n",
                         netif_queue_stopped(self->dev) ? "TRUE" : "FALSE");

            seq_putc(seq,'\n');
      }
      return 0;
}

static const struct seq_operations irlan_seq_ops = {
      .start = irlan_seq_start,
      .next  = irlan_seq_next,
      .stop  = irlan_seq_stop,
      .show  = irlan_seq_show,
};

static int irlan_seq_open(struct inode *inode, struct file *file)
{
      return seq_open(file, &irlan_seq_ops);
}
#endif

MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("The Linux IrDA LAN protocol");
MODULE_LICENSE("GPL");

module_param(eth, bool, 0);
MODULE_PARM_DESC(eth, "Name devices ethX (0) or irlanX (1)");
module_param(access, int, 0);
MODULE_PARM_DESC(access, "Access type DIRECT=1, PEER=2, HOSTED=3");

module_init(irlan_init);
module_exit(irlan_cleanup);


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