iriap.c

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/*********************************************************************
 *
 * Filename:      iriap.c
 * Version:       0.8
 * Description:   Information Access Protocol (IAP)
 * Status:        Experimental.
 * Author:        Dag Brattli <[email protected]>
 * Created at:    Thu Aug 21 00:02:07 1997
 * Modified at:   Sat Dec 25 16:42:42 1999
 * Modified by:   Dag Brattli <[email protected]>
 *
 *     Copyright (c) 1998-1999 Dag Brattli <[email protected]>,
 *     All Rights Reserved.
 *     Copyright (c) 2000-2003 Jean Tourrilhes <[email protected]>
 *
 *     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 <linux/slab.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 *const 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);
}

static struct lock_class_key irias_objects_key;

/*
 * 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",
                 __func__);
        hashbin_delete(iriap, NULL);
        return -ENOMEM;
    }

    lockdep_set_class_and_name(&irias_objects->hb_spinlock, &irias_objects_key,
                   "irias_objects");

    /*
     *  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", __func__);
        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", __func__);

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

    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", __func__);

    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", __func__);

    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", __func__);
        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", __func__, irlmp_reasons[reason]);

    self = 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", __func__);


        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", __func__);
        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", __func__);

    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",
               __func__, 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 = get_unaligned_be16(fp + n);
    n += 2;

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

    /* Get object ID, MSB first */
    obj_id = get_unaligned_be16(fp + n);
    n += 2;

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

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

        /* Make sure the string is null-terminated */
        if (n + value_len < skb->len)
            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 = 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", __func__);
        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", __func__);

    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 = 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", __func__);
        skb_put(tx_skb, 1);
        fp[n++] = value->type;
        break;
    default:
        IRDA_DEBUG(0, "%s(), type not implemented!\n", __func__);
        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", __func__);

    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++];

    IRDA_ASSERT(name_len < IAS_MAX_CLASSNAME + 1, return;);

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

    attr_len = fp[n++];

    IRDA_ASSERT(attr_len < IAS_MAX_ATTRIBNAME + 1, return;);

    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);
}

/*
 * 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", __func__);

    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", __func__);
        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 = 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", __func__);

    self = 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", __func__);
        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", __func__);
        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", __func__);

    self = 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", __func__);
        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",
                 __func__);
        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", __func__);
        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", __func__);
            /* 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", __func__);
            /* 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", __func__,
               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", __func__);

    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", __func__);
        return;
    }
    opcode &= 0x7f; /* Mask away LST bit */

    switch (opcode) {
    case GET_INFO_BASE:
        IRDA_WARNING("%s: GetInfoBaseDetails not implemented yet!\n",
                 __func__);
        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 *const 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 */