iriap.c

linux 内核源代码

	__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 */