- 根目录:
- net
- irda
- ircomm
- ircomm_ttp.c
/*********************************************************************
*
* Filename: ircomm_ttp.c
* Version: 1.0
* Description: Interface between IrCOMM and IrTTP
* Status: Stable
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Jun 6 20:48:27 1999
* Modified at: Mon Dec 13 11:35:13 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999 Dag Brattli, 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#include <linux/init.h>
#include <net/irda/irda.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irttp.h>
#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_ttp.h>
static int ircomm_ttp_data_indication(void *instance, void *sap,
struct sk_buff *skb);
static void ircomm_ttp_connect_confirm(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb);
static void ircomm_ttp_connect_indication(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb);
static void ircomm_ttp_flow_indication(void *instance, void *sap,
LOCAL_FLOW cmd);
static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
LM_REASON reason,
struct sk_buff *skb);
static int ircomm_ttp_data_request(struct ircomm_cb *self,
struct sk_buff *skb,
int clen);
static int ircomm_ttp_connect_request(struct ircomm_cb *self,
struct sk_buff *userdata,
struct ircomm_info *info);
static int ircomm_ttp_connect_response(struct ircomm_cb *self,
struct sk_buff *userdata);
static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
struct sk_buff *userdata,
struct ircomm_info *info);
/*
* Function ircomm_open_tsap (self)
*
*
*
*/
int ircomm_open_tsap(struct ircomm_cb *self)
{
notify_t notify;
/* Register callbacks */
irda_notify_init(¬ify);
notify.data_indication = ircomm_ttp_data_indication;
notify.connect_confirm = ircomm_ttp_connect_confirm;
notify.connect_indication = ircomm_ttp_connect_indication;
notify.flow_indication = ircomm_ttp_flow_indication;
notify.disconnect_indication = ircomm_ttp_disconnect_indication;
notify.instance = self;
strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
¬ify);
if (!self->tsap) {
pr_debug("%sfailed to allocate tsap\n", __func__);
return -1;
}
self->slsap_sel = self->tsap->stsap_sel;
/*
* Initialize the call-table for issuing commands
*/
self->issue.data_request = ircomm_ttp_data_request;
self->issue.connect_request = ircomm_ttp_connect_request;
self->issue.connect_response = ircomm_ttp_connect_response;
self->issue.disconnect_request = ircomm_ttp_disconnect_request;
return 0;
}
/*
* Function ircomm_ttp_connect_request (self, userdata)
*
*
*
*/
static int ircomm_ttp_connect_request(struct ircomm_cb *self,
struct sk_buff *userdata,
struct ircomm_info *info)
{
int ret = 0;
/* Don't forget to refcount it - should be NULL anyway */
if(userdata)
skb_get(userdata);
ret = irttp_connect_request(self->tsap, info->dlsap_sel,
info->saddr, info->daddr, NULL,
TTP_SAR_DISABLE, userdata);
return ret;
}
/*
* Function ircomm_ttp_connect_response (self, skb)
*
*
*
*/
static int ircomm_ttp_connect_response(struct ircomm_cb *self,
struct sk_buff *userdata)
{
int ret;
/* Don't forget to refcount it - should be NULL anyway */
if(userdata)
skb_get(userdata);
ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
return ret;
}
/*
* Function ircomm_ttp_data_request (self, userdata)
*
* Send IrCOMM data to IrTTP layer. Currently we do not try to combine
* control data with pure data, so they will be sent as separate frames.
* Should not be a big problem though, since control frames are rare. But
* some of them are sent after connection establishment, so this can
* increase the latency a bit.
*/
static int ircomm_ttp_data_request(struct ircomm_cb *self,
struct sk_buff *skb,
int clen)
{
int ret;
IRDA_ASSERT(skb != NULL, return -1;);
pr_debug("%s(), clen=%d\n", __func__ , clen);
/*
* Insert clen field, currently we either send data only, or control
* only frames, to make things easier and avoid queueing
*/
IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
/* Don't forget to refcount it - see ircomm_tty_do_softint() */
skb_get(skb);
skb_push(skb, IRCOMM_HEADER_SIZE);
skb->data[0] = clen;
ret = irttp_data_request(self->tsap, skb);
if (ret) {
net_err_ratelimited("%s(), failed\n", __func__);
/* irttp_data_request already free the packet */
}
return ret;
}
/*
* Function ircomm_ttp_data_indication (instance, sap, skb)
*
* Incoming data
*
*/
static int ircomm_ttp_data_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct ircomm_cb *self = (struct ircomm_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
/* Drop reference count - see ircomm_tty_data_indication(). */
dev_kfree_skb(skb);
return 0;
}
static void ircomm_ttp_connect_confirm(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct ircomm_cb *self = (struct ircomm_cb *) instance;
struct ircomm_info info;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(qos != NULL, goto out;);
if (max_sdu_size != TTP_SAR_DISABLE) {
net_err_ratelimited("%s(), SAR not allowed for IrCOMM!\n",
__func__);
goto out;
}
info.max_data_size = irttp_get_max_seg_size(self->tsap)
- IRCOMM_HEADER_SIZE;
info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
info.qos = qos;
ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
out:
/* Drop reference count - see ircomm_tty_connect_confirm(). */
dev_kfree_skb(skb);
}
/*
* Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
* max_header_size, skb)
*
*
*
*/
static void ircomm_ttp_connect_indication(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct ircomm_cb *self = (struct ircomm_cb *)instance;
struct ircomm_info info;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(qos != NULL, goto out;);
if (max_sdu_size != TTP_SAR_DISABLE) {
net_err_ratelimited("%s(), SAR not allowed for IrCOMM!\n",
__func__);
goto out;
}
info.max_data_size = irttp_get_max_seg_size(self->tsap)
- IRCOMM_HEADER_SIZE;
info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
info.qos = qos;
ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
out:
/* Drop reference count - see ircomm_tty_connect_indication(). */
dev_kfree_skb(skb);
}
/*
* Function ircomm_ttp_disconnect_request (self, userdata, info)
*
*
*
*/
static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
struct sk_buff *userdata,
struct ircomm_info *info)
{
int ret;
/* Don't forget to refcount it - should be NULL anyway */
if(userdata)
skb_get(userdata);
ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
return ret;
}
/*
* Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
*
*
*
*/
static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
LM_REASON reason,
struct sk_buff *skb)
{
struct ircomm_cb *self = (struct ircomm_cb *) instance;
struct ircomm_info info;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
info.reason = reason;
ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
/* Drop reference count - see ircomm_tty_disconnect_indication(). */
if(skb)
dev_kfree_skb(skb);
}
/*
* Function ircomm_ttp_flow_indication (instance, sap, cmd)
*
* Layer below is telling us to start or stop the flow of data
*
*/
static void ircomm_ttp_flow_indication(void *instance, void *sap,
LOCAL_FLOW cmd)
{
struct ircomm_cb *self = (struct ircomm_cb *) instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
if (self->notify.flow_indication)
self->notify.flow_indication(self->notify.instance, self, cmd);
}