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iriap.c

/*********************************************************************
 *
 * Filename:      iriap.c
 * Version:       0.8
 * Description:   Information Access Protocol (IAP)
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Thu Aug 21 00:02:07 1997
 * Modified at:   Sat Dec 25 16:42:42 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
 *     All Rights Reserved.
 *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 *
 *     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/types.h>
#include <linux/skbuff.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/seq_file.h>

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

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

#ifdef CONFIG_IRDA_DEBUG
/* FIXME: This one should go in irlmp.c */
static const char *ias_charset_types[] = {
      "CS_ASCII",
      "CS_ISO_8859_1",
      "CS_ISO_8859_2",
      "CS_ISO_8859_3",
      "CS_ISO_8859_4",
      "CS_ISO_8859_5",
      "CS_ISO_8859_6",
      "CS_ISO_8859_7",
      "CS_ISO_8859_8",
      "CS_ISO_8859_9",
      "CS_UNICODE"
};
#endif      /* CONFIG_IRDA_DEBUG */

static hashbin_t *iriap = NULL;
static void *service_handle;

static void __iriap_close(struct iriap_cb *self);
static int iriap_register_lsap(struct iriap_cb *self, __u8 slsap_sel, int mode);
static void iriap_disconnect_indication(void *instance, void *sap,
                              LM_REASON reason, struct sk_buff *skb);
static void iriap_connect_indication(void *instance, void *sap,
                             struct qos_info *qos, __u32 max_sdu_size,
                             __u8 max_header_size,
                             struct sk_buff *skb);
static void iriap_connect_confirm(void *instance, void *sap,
                          struct qos_info *qos,
                          __u32 max_sdu_size, __u8 max_header_size,
                          struct sk_buff *skb);
static int iriap_data_indication(void *instance, void *sap,
                         struct sk_buff *skb);

static void iriap_watchdog_timer_expired(void *data);

static inline void iriap_start_watchdog_timer(struct iriap_cb *self,
                                    int timeout)
{
      irda_start_timer(&self->watchdog_timer, timeout, self,
                   iriap_watchdog_timer_expired);
}

/*
 * Function iriap_init (void)
 *
 *    Initializes the IrIAP layer, called by the module initialization code
 *    in irmod.c
 */
int __init iriap_init(void)
{
      struct ias_object *obj;
      struct iriap_cb *server;
      __u8 oct_seq[6];
      __u16 hints;

      /* Allocate master array */
      iriap = hashbin_new(HB_LOCK);
      if (!iriap)
            return -ENOMEM;

      /* Object repository - defined in irias_object.c */
      irias_objects = hashbin_new(HB_LOCK);
      if (!irias_objects) {
            IRDA_WARNING("%s: Can't allocate irias_objects hashbin!\n",
                       __FUNCTION__);
            hashbin_delete(iriap, NULL);
            return -ENOMEM;
      }

      /*
       *  Register some default services for IrLMP
       */
      hints  = irlmp_service_to_hint(S_COMPUTER);
      service_handle = irlmp_register_service(hints);

      /* Register the Device object with LM-IAS */
      obj = irias_new_object("Device", IAS_DEVICE_ID);
      irias_add_string_attrib(obj, "DeviceName", "Linux", IAS_KERNEL_ATTR);

      oct_seq[0] = 0x01;  /* Version 1 */
      oct_seq[1] = 0x00;  /* IAS support bits */
      oct_seq[2] = 0x00;  /* LM-MUX support bits */
#ifdef CONFIG_IRDA_ULTRA
      oct_seq[2] |= 0x04; /* Connectionless Data support */
#endif
      irias_add_octseq_attrib(obj, "IrLMPSupport", oct_seq, 3,
                        IAS_KERNEL_ATTR);
      irias_insert_object(obj);

      /*
       *  Register server support with IrLMP so we can accept incoming
       *  connections
       */
      server = iriap_open(LSAP_IAS, IAS_SERVER, NULL, NULL);
      if (!server) {
            IRDA_DEBUG(0, "%s(), unable to open server\n", __FUNCTION__);
            return -1;
      }
      iriap_register_lsap(server, LSAP_IAS, IAS_SERVER);

      return 0;
}

/*
 * Function iriap_cleanup (void)
 *
 *    Initializes the IrIAP layer, called by the module cleanup code in
 *    irmod.c
 */
void iriap_cleanup(void)
{
      irlmp_unregister_service(service_handle);

      hashbin_delete(iriap, (FREE_FUNC) __iriap_close);
      hashbin_delete(irias_objects, (FREE_FUNC) __irias_delete_object);
}

/*
 * Function iriap_open (void)
 *
 *    Opens an instance of the IrIAP layer, and registers with IrLMP
 */
struct iriap_cb *iriap_open(__u8 slsap_sel, int mode, void *priv,
                      CONFIRM_CALLBACK callback)
{
      struct iriap_cb *self;

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

      self = kzalloc(sizeof(*self), GFP_ATOMIC);
      if (!self) {
            IRDA_WARNING("%s: Unable to kmalloc!\n", __FUNCTION__);
            return NULL;
      }

      /*
       *  Initialize instance
       */

      self->magic = IAS_MAGIC;
      self->mode = mode;
      if (mode == IAS_CLIENT)
            iriap_register_lsap(self, slsap_sel, mode);

      self->confirm = callback;
      self->priv = priv;

      /* iriap_getvaluebyclass_request() will construct packets before
       * we connect, so this must have a sane value... Jean II */
      self->max_header_size = LMP_MAX_HEADER;

      init_timer(&self->watchdog_timer);

      hashbin_insert(iriap, (irda_queue_t *) self, (long) self, NULL);

      /* Initialize state machines */
      iriap_next_client_state(self, S_DISCONNECT);
      iriap_next_call_state(self, S_MAKE_CALL);
      iriap_next_server_state(self, R_DISCONNECT);
      iriap_next_r_connect_state(self, R_WAITING);

      return self;
}
EXPORT_SYMBOL(iriap_open);

/*
 * Function __iriap_close (self)
 *
 *    Removes (deallocates) the IrIAP instance
 *
 */
static void __iriap_close(struct iriap_cb *self)
{
      IRDA_DEBUG(4, "%s()\n", __FUNCTION__);

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

      del_timer(&self->watchdog_timer);

      if (self->request_skb)
            dev_kfree_skb(self->request_skb);

      self->magic = 0;

      kfree(self);
}

/*
 * Function iriap_close (void)
 *
 *    Closes IrIAP and deregisters with IrLMP
 */
void iriap_close(struct iriap_cb *self)
{
      struct iriap_cb *entry;

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

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

      if (self->lsap) {
            irlmp_close_lsap(self->lsap);
            self->lsap = NULL;
      }

      entry = (struct iriap_cb *) hashbin_remove(iriap, (long) self, NULL);
      IRDA_ASSERT(entry == self, return;);

      __iriap_close(self);
}
EXPORT_SYMBOL(iriap_close);

static int iriap_register_lsap(struct iriap_cb *self, __u8 slsap_sel, int mode)
{
      notify_t notify;

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

      irda_notify_init(&notify);
      notify.connect_confirm       = iriap_connect_confirm;
      notify.connect_indication    = iriap_connect_indication;
      notify.disconnect_indication = iriap_disconnect_indication;
      notify.data_indication       = iriap_data_indication;
      notify.instance = self;
      if (mode == IAS_CLIENT)
            strcpy(notify.name, "IrIAS cli");
      else
            strcpy(notify.name, "IrIAS srv");

      self->lsap = irlmp_open_lsap(slsap_sel, &notify, 0);
      if (self->lsap == NULL) {
            IRDA_ERROR("%s: Unable to allocated LSAP!\n", __FUNCTION__);
            return -1;
      }
      self->slsap_sel = self->lsap->slsap_sel;

      return 0;
}

/*
 * Function iriap_disconnect_indication (handle, reason)
 *
 *    Got disconnect, so clean up everything associated with this connection
 *
 */
static void iriap_disconnect_indication(void *instance, void *sap,
                              LM_REASON reason,
                              struct sk_buff *skb)
{
      struct iriap_cb *self;

      IRDA_DEBUG(4, "%s(), reason=%s\n", __FUNCTION__, irlmp_reasons[reason]);

      self = (struct iriap_cb *) instance;

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

      IRDA_ASSERT(iriap != NULL, return;);

      del_timer(&self->watchdog_timer);

      /* Not needed */
      if (skb)
            dev_kfree_skb(skb);

      if (self->mode == IAS_CLIENT) {
            IRDA_DEBUG(4, "%s(), disconnect as client\n", __FUNCTION__);


            iriap_do_client_event(self, IAP_LM_DISCONNECT_INDICATION,
                              NULL);
            /*
             * Inform service user that the request failed by sending
             * it a NULL value. Warning, the client might close us, so
             * remember no to use self anymore after calling confirm
             */
            if (self->confirm)
                  self->confirm(IAS_DISCONNECT, 0, NULL, self->priv);
      } else {
            IRDA_DEBUG(4, "%s(), disconnect as server\n", __FUNCTION__);
            iriap_do_server_event(self, IAP_LM_DISCONNECT_INDICATION,
                              NULL);
            iriap_close(self);
      }
}

/*
 * Function iriap_disconnect_request (handle)
 */
static void iriap_disconnect_request(struct iriap_cb *self)
{
      struct sk_buff *tx_skb;

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

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

      tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
      if (tx_skb == NULL) {
            IRDA_DEBUG(0,
                     "%s(), Could not allocate an sk_buff of length %d\n",
                     __FUNCTION__, LMP_MAX_HEADER);
            return;
      }

      /*
       *  Reserve space for MUX control and LAP header
       */
      skb_reserve(tx_skb, LMP_MAX_HEADER);

      irlmp_disconnect_request(self->lsap, tx_skb);
}

/*
 * Function iriap_getvaluebyclass (addr, name, attr)
 *
 *    Retrieve all values from attribute in all objects with given class
 *    name
 */
int iriap_getvaluebyclass_request(struct iriap_cb *self,
                          __u32 saddr, __u32 daddr,
                          char *name, char *attr)
{
      struct sk_buff *tx_skb;
      int name_len, attr_len, skb_len;
      __u8 *frame;

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

      /* Client must supply the destination device address */
      if (!daddr)
            return -1;

      self->daddr = daddr;
      self->saddr = saddr;

      /*
       *  Save operation, so we know what the later indication is about
       */
      self->operation = GET_VALUE_BY_CLASS;

      /* Give ourselves 10 secs to finish this operation */
      iriap_start_watchdog_timer(self, 10*HZ);

      name_len = strlen(name);      /* Up to IAS_MAX_CLASSNAME = 60 */
      attr_len = strlen(attr);      /* Up to IAS_MAX_ATTRIBNAME = 60 */

      skb_len = self->max_header_size+2+name_len+1+attr_len+4;
      tx_skb = alloc_skb(skb_len, GFP_ATOMIC);
      if (!tx_skb)
            return -ENOMEM;

      /* Reserve space for MUX and LAP header */
      skb_reserve(tx_skb, self->max_header_size);
      skb_put(tx_skb, 3+name_len+attr_len);
      frame = tx_skb->data;

      /* Build frame */
      frame[0] = IAP_LST | GET_VALUE_BY_CLASS;
      frame[1] = name_len;                       /* Insert length of name */
      memcpy(frame+2, name, name_len);           /* Insert name */
      frame[2+name_len] = attr_len;              /* Insert length of attr */
      memcpy(frame+3+name_len, attr, attr_len);  /* Insert attr */

      iriap_do_client_event(self, IAP_CALL_REQUEST_GVBC, tx_skb);

      /* Drop reference count - see state_s_disconnect(). */
      dev_kfree_skb(tx_skb);

      return 0;
}
EXPORT_SYMBOL(iriap_getvaluebyclass_request);

/*
 * Function iriap_getvaluebyclass_confirm (self, skb)
 *
 *    Got result from GetValueByClass command. Parse it and return result
 *    to service user.
 *
 */
static void iriap_getvaluebyclass_confirm(struct iriap_cb *self,
                                struct sk_buff *skb)
{
      struct ias_value *value;
      int charset;
      __u32 value_len;
      __u32 tmp_cpu32;
      __u16 obj_id;
      __u16 len;
      __u8  type;
      __u8 *fp;
      int n;

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

      /* Initialize variables */
      fp = skb->data;
      n = 2;

      /* Get length, MSB first */
      len = be16_to_cpu(get_unaligned((__be16 *)(fp+n))); n += 2;

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

      /* Get object ID, MSB first */
      obj_id = be16_to_cpu(get_unaligned((__be16 *)(fp+n))); n += 2;

      type = fp[n++];
      IRDA_DEBUG(4, "%s(), Value type = %d\n", __FUNCTION__, type);

      switch (type) {
      case IAS_INTEGER:
            memcpy(&tmp_cpu32, fp+n, 4); n += 4;
            be32_to_cpus(&tmp_cpu32);
            value = irias_new_integer_value(tmp_cpu32);

            /*  Legal values restricted to 0x01-0x6f, page 15 irttp */
            IRDA_DEBUG(4, "%s(), lsap=%d\n", __FUNCTION__, value->t.integer);
            break;
      case IAS_STRING:
            charset = fp[n++];

            switch (charset) {
            case CS_ASCII:
                  break;
/*          case CS_ISO_8859_1: */
/*          case CS_ISO_8859_2: */
/*          case CS_ISO_8859_3: */
/*          case CS_ISO_8859_4: */
/*          case CS_ISO_8859_5: */
/*          case CS_ISO_8859_6: */
/*          case CS_ISO_8859_7: */
/*          case CS_ISO_8859_8: */
/*          case CS_ISO_8859_9: */
/*          case CS_UNICODE: */
            default:
                  IRDA_DEBUG(0, "%s(), charset %s, not supported\n",
                           __FUNCTION__, ias_charset_types[charset]);

                  /* Aborting, close connection! */
                  iriap_disconnect_request(self);
                  return;
                  /* break; */
            }
            value_len = fp[n++];
            IRDA_DEBUG(4, "%s(), strlen=%d\n", __FUNCTION__, value_len);

            /* Make sure the string is null-terminated */
            fp[n+value_len] = 0x00;
            IRDA_DEBUG(4, "Got string %s\n", fp+n);

            /* Will truncate to IAS_MAX_STRING bytes */
            value = irias_new_string_value(fp+n);
            break;
      case IAS_OCT_SEQ:
            value_len = be16_to_cpu(get_unaligned((__be16 *)(fp+n)));
            n += 2;

            /* Will truncate to IAS_MAX_OCTET_STRING bytes */
            value = irias_new_octseq_value(fp+n, value_len);
            break;
      default:
            value = irias_new_missing_value();
            break;
      }

      /* Finished, close connection! */
      iriap_disconnect_request(self);

      /* Warning, the client might close us, so remember no to use self
       * anymore after calling confirm
       */
      if (self->confirm)
            self->confirm(IAS_SUCCESS, obj_id, value, self->priv);
      else {
            IRDA_DEBUG(0, "%s(), missing handler!\n", __FUNCTION__);
            irias_delete_value(value);
      }
}

/*
 * Function iriap_getvaluebyclass_response ()
 *
 *    Send answer back to remote LM-IAS
 *
 */
static void iriap_getvaluebyclass_response(struct iriap_cb *self,
                                 __u16 obj_id,
                                 __u8 ret_code,
                                 struct ias_value *value)
{
      struct sk_buff *tx_skb;
      int n;
      __be32 tmp_be32;
      __be16 tmp_be16;
      __u8 *fp;

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

      IRDA_ASSERT(self != NULL, return;);
      IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
      IRDA_ASSERT(value != NULL, return;);
      IRDA_ASSERT(value->len <= 1024, return;);

      /* Initialize variables */
      n = 0;

      /*
       *  We must adjust the size of the response after the length of the
       *  value. We add 32 bytes because of the 6 bytes for the frame and
       *  max 5 bytes for the value coding.
       */
      tx_skb = alloc_skb(value->len + self->max_header_size + 32,
                     GFP_ATOMIC);
      if (!tx_skb)
            return;

      /* Reserve space for MUX and LAP header */
      skb_reserve(tx_skb, self->max_header_size);
      skb_put(tx_skb, 6);

      fp = tx_skb->data;

      /* Build frame */
      fp[n++] = GET_VALUE_BY_CLASS | IAP_LST;
      fp[n++] = ret_code;

      /* Insert list length (MSB first) */
      tmp_be16 = __constant_htons(0x0001);
      memcpy(fp+n, &tmp_be16, 2);  n += 2;

      /* Insert object identifier ( MSB first) */
      tmp_be16 = cpu_to_be16(obj_id);
      memcpy(fp+n, &tmp_be16, 2); n += 2;

      switch (value->type) {
      case IAS_STRING:
            skb_put(tx_skb, 3 + value->len);
            fp[n++] = value->type;
            fp[n++] = 0; /* ASCII */
            fp[n++] = (__u8) value->len;
            memcpy(fp+n, value->t.string, value->len); n+=value->len;
            break;
      case IAS_INTEGER:
            skb_put(tx_skb, 5);
            fp[n++] = value->type;

            tmp_be32 = cpu_to_be32(value->t.integer);
            memcpy(fp+n, &tmp_be32, 4); n += 4;
            break;
      case IAS_OCT_SEQ:
            skb_put(tx_skb, 3 + value->len);
            fp[n++] = value->type;

            tmp_be16 = cpu_to_be16(value->len);
            memcpy(fp+n, &tmp_be16, 2); n += 2;
            memcpy(fp+n, value->t.oct_seq, value->len); n+=value->len;
            break;
      case IAS_MISSING:
            IRDA_DEBUG( 3, "%s: sending IAS_MISSING\n", __FUNCTION__);
            skb_put(tx_skb, 1);
            fp[n++] = value->type;
            break;
      default:
            IRDA_DEBUG(0, "%s(), type not implemented!\n", __FUNCTION__);
            break;
      }
      iriap_do_r_connect_event(self, IAP_CALL_RESPONSE, tx_skb);

      /* Drop reference count - see state_r_execute(). */
      dev_kfree_skb(tx_skb);
}

/*
 * Function iriap_getvaluebyclass_indication (self, skb)
 *
 *    getvaluebyclass is requested from peer LM-IAS
 *
 */
static void iriap_getvaluebyclass_indication(struct iriap_cb *self,
                                   struct sk_buff *skb)
{
      struct ias_object *obj;
      struct ias_attrib *attrib;
      int name_len;
      int attr_len;
      char name[IAS_MAX_CLASSNAME + 1];   /* 60 bytes */
      char attr[IAS_MAX_ATTRIBNAME + 1];  /* 60 bytes */
      __u8 *fp;
      int n;

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

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

      fp = skb->data;
      n = 1;

      name_len = fp[n++];
      memcpy(name, fp+n, name_len); n+=name_len;
      name[name_len] = '\0';

      attr_len = fp[n++];
      memcpy(attr, fp+n, attr_len); n+=attr_len;
      attr[attr_len] = '\0';

      IRDA_DEBUG(4, "LM-IAS: Looking up %s: %s\n", name, attr);
      obj = irias_find_object(name);

      if (obj == NULL) {
            IRDA_DEBUG(2, "LM-IAS: Object %s not found\n", name);
            iriap_getvaluebyclass_response(self, 0x1235, IAS_CLASS_UNKNOWN,
                                     &irias_missing);
            return;
      }
      IRDA_DEBUG(4, "LM-IAS: found %s, id=%d\n", obj->name, obj->id);

      attrib = irias_find_attrib(obj, attr);
      if (attrib == NULL) {
            IRDA_DEBUG(2, "LM-IAS: Attribute %s not found\n", attr);
            iriap_getvaluebyclass_response(self, obj->id,
                                     IAS_ATTRIB_UNKNOWN,
                                     &irias_missing);
            return;
      }

      /* We have a match; send the value.  */
      iriap_getvaluebyclass_response(self, obj->id, IAS_SUCCESS,
                               attrib->value);

      return;
}

/*
 * Function iriap_send_ack (void)
 *
 *    Currently not used
 *
 */
void iriap_send_ack(struct iriap_cb *self)
{
      struct sk_buff *tx_skb;
      __u8 *frame;

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

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

      tx_skb = alloc_skb(LMP_MAX_HEADER + 1, GFP_ATOMIC);
      if (!tx_skb)
            return;

      /* Reserve space for MUX and LAP header */
      skb_reserve(tx_skb, self->max_header_size);
      skb_put(tx_skb, 1);
      frame = tx_skb->data;

      /* Build frame */
      frame[0] = IAP_LST | IAP_ACK | self->operation;

      irlmp_data_request(self->lsap, tx_skb);
}

void iriap_connect_request(struct iriap_cb *self)
{
      int ret;

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

      ret = irlmp_connect_request(self->lsap, LSAP_IAS,
                            self->saddr, self->daddr,
                            NULL, NULL);
      if (ret < 0) {
            IRDA_DEBUG(0, "%s(), connect failed!\n", __FUNCTION__);
            self->confirm(IAS_DISCONNECT, 0, NULL, self->priv);
      }
}

/*
 * Function iriap_connect_confirm (handle, skb)
 *
 *    LSAP connection confirmed!
 *
 */
static void iriap_connect_confirm(void *instance, void *sap,
                          struct qos_info *qos, __u32 max_seg_size,
                          __u8 max_header_size,
                          struct sk_buff *skb)
{
      struct iriap_cb *self;

      self = (struct iriap_cb *) instance;

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

      self->max_data_size = max_seg_size;
      self->max_header_size = max_header_size;

      del_timer(&self->watchdog_timer);

      iriap_do_client_event(self, IAP_LM_CONNECT_CONFIRM, skb);

      /* Drop reference count - see state_s_make_call(). */
      dev_kfree_skb(skb);
}

/*
 * Function iriap_connect_indication ( handle, skb)
 *
 *    Remote LM-IAS is requesting connection
 *
 */
static void iriap_connect_indication(void *instance, void *sap,
                             struct qos_info *qos, __u32 max_seg_size,
                             __u8 max_header_size,
                             struct sk_buff *skb)
{
      struct iriap_cb *self, *new;

      IRDA_DEBUG(1, "%s()\n", __FUNCTION__);

      self = (struct iriap_cb *) instance;

      IRDA_ASSERT(skb != NULL, return;);
      IRDA_ASSERT(self != NULL, goto out;);
      IRDA_ASSERT(self->magic == IAS_MAGIC, goto out;);

      /* Start new server */
      new = iriap_open(LSAP_IAS, IAS_SERVER, NULL, NULL);
      if (!new) {
            IRDA_DEBUG(0, "%s(), open failed\n", __FUNCTION__);
            goto out;
      }

      /* Now attach up the new "socket" */
      new->lsap = irlmp_dup(self->lsap, new);
      if (!new->lsap) {
            IRDA_DEBUG(0, "%s(), dup failed!\n", __FUNCTION__);
            goto out;
      }

      new->max_data_size = max_seg_size;
      new->max_header_size = max_header_size;

      /* Clean up the original one to keep it in listen state */
      irlmp_listen(self->lsap);

      iriap_do_server_event(new, IAP_LM_CONNECT_INDICATION, skb);

out:
      /* Drop reference count - see state_r_disconnect(). */
      dev_kfree_skb(skb);
}

/*
 * Function iriap_data_indication (handle, skb)
 *
 *    Receives data from connection identified by handle from IrLMP
 *
 */
static int iriap_data_indication(void *instance, void *sap,
                         struct sk_buff *skb)
{
      struct iriap_cb *self;
      __u8  *frame;
      __u8  opcode;

      IRDA_DEBUG(3, "%s()\n", __FUNCTION__);

      self = (struct iriap_cb *) instance;

      IRDA_ASSERT(skb != NULL, return 0;);
      IRDA_ASSERT(self != NULL, goto out;);
      IRDA_ASSERT(self->magic == IAS_MAGIC, goto out;);

      frame = skb->data;

      if (self->mode == IAS_SERVER) {
            /* Call server */
            IRDA_DEBUG(4, "%s(), Calling server!\n", __FUNCTION__);
            iriap_do_r_connect_event(self, IAP_RECV_F_LST, skb);
            goto out;
      }
      opcode = frame[0];
      if (~opcode & IAP_LST) {
            IRDA_WARNING("%s:, IrIAS multiframe commands or "
                       "results is not implemented yet!\n",
                       __FUNCTION__);
            goto out;
      }

      /* Check for ack frames since they don't contain any data */
      if (opcode & IAP_ACK) {
            IRDA_DEBUG(0, "%s() Got ack frame!\n", __FUNCTION__);
            goto out;
      }

      opcode &= ~IAP_LST; /* Mask away LST bit */

      switch (opcode) {
      case GET_INFO_BASE:
            IRDA_DEBUG(0, "IrLMP GetInfoBaseDetails not implemented!\n");
            break;
      case GET_VALUE_BY_CLASS:
            iriap_do_call_event(self, IAP_RECV_F_LST, NULL);

            switch (frame[1]) {
            case IAS_SUCCESS:
                  iriap_getvaluebyclass_confirm(self, skb);
                  break;
            case IAS_CLASS_UNKNOWN:
                  IRDA_DEBUG(1, "%s(), No such class!\n", __FUNCTION__);
                  /* Finished, close connection! */
                  iriap_disconnect_request(self);

                  /*
                   * Warning, the client might close us, so remember
                   * no to use self anymore after calling confirm
                   */
                  if (self->confirm)
                        self->confirm(IAS_CLASS_UNKNOWN, 0, NULL,
                                    self->priv);
                  break;
            case IAS_ATTRIB_UNKNOWN:
                  IRDA_DEBUG(1, "%s(), No such attribute!\n", __FUNCTION__);
                  /* Finished, close connection! */
                  iriap_disconnect_request(self);

                  /*
                   * Warning, the client might close us, so remember
                   * no to use self anymore after calling confirm
                   */
                  if (self->confirm)
                        self->confirm(IAS_ATTRIB_UNKNOWN, 0, NULL,
                                    self->priv);
                  break;
            }
            break;
      default:
            IRDA_DEBUG(0, "%s(), Unknown op-code: %02x\n", __FUNCTION__,
                     opcode);
            break;
      }

out:
      /* Cleanup - sub-calls will have done skb_get() as needed. */
      dev_kfree_skb(skb);
      return 0;
}

/*
 * Function iriap_call_indication (self, skb)
 *
 *    Received call to server from peer LM-IAS
 *
 */
void iriap_call_indication(struct iriap_cb *self, struct sk_buff *skb)
{
      __u8 *fp;
      __u8 opcode;

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

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

      fp = skb->data;

      opcode = fp[0];
      if (~opcode & 0x80) {
            IRDA_WARNING("%s: IrIAS multiframe commands or results "
                       "is not implemented yet!\n", __FUNCTION__);
            return;
      }
      opcode &= 0x7f; /* Mask away LST bit */

      switch (opcode) {
      case GET_INFO_BASE:
            IRDA_WARNING("%s: GetInfoBaseDetails not implemented yet!\n",
                       __FUNCTION__);
            break;
      case GET_VALUE_BY_CLASS:
            iriap_getvaluebyclass_indication(self, skb);
            break;
      }
      /* skb will be cleaned up in iriap_data_indication */
}

/*
 * Function iriap_watchdog_timer_expired (data)
 *
 *    Query has taken too long time, so abort
 *
 */
static void iriap_watchdog_timer_expired(void *data)
{
      struct iriap_cb *self = (struct iriap_cb *) data;

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

      /* iriap_close(self); */
}

#ifdef CONFIG_PROC_FS

static const char *ias_value_types[] = {
      "IAS_MISSING",
      "IAS_INTEGER",
      "IAS_OCT_SEQ",
      "IAS_STRING"
};

static inline struct ias_object *irias_seq_idx(loff_t pos)
{
      struct ias_object *obj;

      for (obj = (struct ias_object *) hashbin_get_first(irias_objects);
           obj; obj = (struct ias_object *) hashbin_get_next(irias_objects)) {
            if (pos-- == 0)
                  break;
      }

      return obj;
}

static void *irias_seq_start(struct seq_file *seq, loff_t *pos)
{
      spin_lock_irq(&irias_objects->hb_spinlock);

      return *pos ? irias_seq_idx(*pos - 1) : SEQ_START_TOKEN;
}

static void *irias_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
      ++*pos;

      return (v == SEQ_START_TOKEN)
            ? (void *) hashbin_get_first(irias_objects)
            : (void *) hashbin_get_next(irias_objects);
}

static void irias_seq_stop(struct seq_file *seq, void *v)
{
      spin_unlock_irq(&irias_objects->hb_spinlock);
}

static int irias_seq_show(struct seq_file *seq, void *v)
{
      if (v == SEQ_START_TOKEN)
            seq_puts(seq, "LM-IAS Objects:\n");
      else {
            struct ias_object *obj = v;
            struct ias_attrib *attrib;

            IRDA_ASSERT(obj->magic == IAS_OBJECT_MAGIC, return -EINVAL;);

            seq_printf(seq, "name: %s, id=%d\n",
                     obj->name, obj->id);

            /* Careful for priority inversions here !
             * All other uses of attrib spinlock are independent of
             * the object spinlock, so we are safe. Jean II */
            spin_lock(&obj->attribs->hb_spinlock);

            /* List all attributes for this object */
            for (attrib = (struct ias_attrib *) hashbin_get_first(obj->attribs);
                 attrib != NULL;
                 attrib = (struct ias_attrib *) hashbin_get_next(obj->attribs)) {

                  IRDA_ASSERT(attrib->magic == IAS_ATTRIB_MAGIC,
                            goto outloop; );

                  seq_printf(seq, " - Attribute name: \"%s\", ",
                           attrib->name);
                  seq_printf(seq, "value[%s]: ",
                           ias_value_types[attrib->value->type]);

                  switch (attrib->value->type) {
                  case IAS_INTEGER:
                        seq_printf(seq, "%d\n",
                                 attrib->value->t.integer);
                        break;
                  case IAS_STRING:
                        seq_printf(seq, "\"%s\"\n",
                                 attrib->value->t.string);
                        break;
                  case IAS_OCT_SEQ:
                        seq_printf(seq, "octet sequence (%d bytes)\n",
                                 attrib->value->len);
                        break;
                  case IAS_MISSING:
                        seq_puts(seq, "missing\n");
                        break;
                  default:
                        seq_printf(seq, "type %d?\n",
                                 attrib->value->type);
                  }
                  seq_putc(seq, '\n');

            }
      IRDA_ASSERT_LABEL(outloop:)
            spin_unlock(&obj->attribs->hb_spinlock);
      }

      return 0;
}

static const struct seq_operations irias_seq_ops = {
      .start  = irias_seq_start,
      .next   = irias_seq_next,
      .stop   = irias_seq_stop,
      .show   = irias_seq_show,
};

static int irias_seq_open(struct inode *inode, struct file *file)
{
      IRDA_ASSERT( irias_objects != NULL, return -EINVAL;);

      return seq_open(file, &irias_seq_ops);
}

const struct file_operations irias_seq_fops = {
      .owner            = THIS_MODULE,
      .open           = irias_seq_open,
      .read           = seq_read,
      .llseek         = seq_lseek,
      .release    = seq_release,
};

#endif /* PROC_FS */

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