369 lines
9.8 KiB
C
369 lines
9.8 KiB
C
/*********************************************************************
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*
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* Filename: ircomm_ttp.c
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* Version: 1.0
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* Description: Interface between IrCOMM and IrTTP
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* Status: Stable
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sun Jun 6 20:48:27 1999
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* Modified at: Mon Dec 13 11:35:13 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1999 Dag Brattli, All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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********************************************************************/
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#include <linux/init.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/iriap.h>
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#include <net/irda/irttp.h>
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#include <net/irda/ircomm_event.h>
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#include <net/irda/ircomm_ttp.h>
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static int ircomm_ttp_data_indication(void *instance, void *sap,
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struct sk_buff *skb);
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static void ircomm_ttp_connect_confirm(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_sdu_size,
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__u8 max_header_size,
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struct sk_buff *skb);
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static void ircomm_ttp_connect_indication(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_sdu_size,
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__u8 max_header_size,
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struct sk_buff *skb);
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static void ircomm_ttp_flow_indication(void *instance, void *sap,
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LOCAL_FLOW cmd);
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static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
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LM_REASON reason,
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struct sk_buff *skb);
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static int ircomm_ttp_data_request(struct ircomm_cb *self,
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struct sk_buff *skb,
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int clen);
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static int ircomm_ttp_connect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info);
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static int ircomm_ttp_connect_response(struct ircomm_cb *self,
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struct sk_buff *userdata);
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static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info);
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/*
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* Function ircomm_open_tsap (self)
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*
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*
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*
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*/
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int ircomm_open_tsap(struct ircomm_cb *self)
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{
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notify_t notify;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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/* Register callbacks */
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irda_notify_init(¬ify);
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notify.data_indication = ircomm_ttp_data_indication;
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notify.connect_confirm = ircomm_ttp_connect_confirm;
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notify.connect_indication = ircomm_ttp_connect_indication;
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notify.flow_indication = ircomm_ttp_flow_indication;
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notify.disconnect_indication = ircomm_ttp_disconnect_indication;
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notify.instance = self;
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strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
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self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
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¬ify);
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if (!self->tsap) {
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IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
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return -1;
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}
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self->slsap_sel = self->tsap->stsap_sel;
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/*
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* Initialize the call-table for issuing commands
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*/
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self->issue.data_request = ircomm_ttp_data_request;
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self->issue.connect_request = ircomm_ttp_connect_request;
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self->issue.connect_response = ircomm_ttp_connect_response;
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self->issue.disconnect_request = ircomm_ttp_disconnect_request;
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return 0;
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}
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/*
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* Function ircomm_ttp_connect_request (self, userdata)
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*
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*
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*
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*/
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static int ircomm_ttp_connect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info)
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{
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int ret = 0;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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/* Don't forget to refcount it - should be NULL anyway */
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if(userdata)
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skb_get(userdata);
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ret = irttp_connect_request(self->tsap, info->dlsap_sel,
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info->saddr, info->daddr, NULL,
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TTP_SAR_DISABLE, userdata);
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return ret;
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}
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/*
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* Function ircomm_ttp_connect_response (self, skb)
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*
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*
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*
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*/
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static int ircomm_ttp_connect_response(struct ircomm_cb *self,
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struct sk_buff *userdata)
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{
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int ret;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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/* Don't forget to refcount it - should be NULL anyway */
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if(userdata)
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skb_get(userdata);
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ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
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return ret;
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}
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/*
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* Function ircomm_ttp_data_request (self, userdata)
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*
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* Send IrCOMM data to IrTTP layer. Currently we do not try to combine
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* control data with pure data, so they will be sent as separate frames.
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* Should not be a big problem though, since control frames are rare. But
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* some of them are sent after connection establishment, so this can
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* increase the latency a bit.
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*/
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static int ircomm_ttp_data_request(struct ircomm_cb *self,
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struct sk_buff *skb,
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int clen)
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{
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int ret;
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IRDA_ASSERT(skb != NULL, return -1;);
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IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);
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/*
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* Insert clen field, currently we either send data only, or control
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* only frames, to make things easier and avoid queueing
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*/
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IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
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/* Don't forget to refcount it - see ircomm_tty_do_softint() */
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skb_get(skb);
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skb_push(skb, IRCOMM_HEADER_SIZE);
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skb->data[0] = clen;
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ret = irttp_data_request(self->tsap, skb);
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if (ret) {
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IRDA_ERROR("%s(), failed\n", __func__);
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/* irttp_data_request already free the packet */
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}
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return ret;
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}
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/*
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* Function ircomm_ttp_data_indication (instance, sap, skb)
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*
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* Incoming data
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*
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*/
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static int ircomm_ttp_data_indication(void *instance, void *sap,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
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IRDA_ASSERT(skb != NULL, return -1;);
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ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
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/* Drop reference count - see ircomm_tty_data_indication(). */
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dev_kfree_skb(skb);
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return 0;
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}
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static void ircomm_ttp_connect_confirm(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_sdu_size,
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__u8 max_header_size,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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struct ircomm_info info;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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IRDA_ASSERT(skb != NULL, return;);
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IRDA_ASSERT(qos != NULL, goto out;);
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if (max_sdu_size != TTP_SAR_DISABLE) {
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IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
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__func__);
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goto out;
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}
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info.max_data_size = irttp_get_max_seg_size(self->tsap)
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- IRCOMM_HEADER_SIZE;
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info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
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out:
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/* Drop reference count - see ircomm_tty_connect_confirm(). */
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
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* max_header_size, skb)
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*
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*
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*
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*/
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static void ircomm_ttp_connect_indication(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_sdu_size,
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__u8 max_header_size,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *)instance;
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struct ircomm_info info;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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IRDA_ASSERT(skb != NULL, return;);
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IRDA_ASSERT(qos != NULL, goto out;);
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if (max_sdu_size != TTP_SAR_DISABLE) {
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IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
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__func__);
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goto out;
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}
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info.max_data_size = irttp_get_max_seg_size(self->tsap)
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- IRCOMM_HEADER_SIZE;
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info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
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out:
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/* Drop reference count - see ircomm_tty_connect_indication(). */
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_ttp_disconnect_request (self, userdata, info)
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*
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*
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*
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*/
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static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
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struct sk_buff *userdata,
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struct ircomm_info *info)
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{
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int ret;
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/* Don't forget to refcount it - should be NULL anyway */
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if(userdata)
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skb_get(userdata);
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ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
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return ret;
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}
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/*
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* Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
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*
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*
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*
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*/
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static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
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LM_REASON reason,
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struct sk_buff *skb)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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struct ircomm_info info;
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IRDA_DEBUG(2, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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info.reason = reason;
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ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
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/* Drop reference count - see ircomm_tty_disconnect_indication(). */
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if(skb)
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dev_kfree_skb(skb);
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}
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/*
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* Function ircomm_ttp_flow_indication (instance, sap, cmd)
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*
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* Layer below is telling us to start or stop the flow of data
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*
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*/
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static void ircomm_ttp_flow_indication(void *instance, void *sap,
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LOCAL_FLOW cmd)
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{
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struct ircomm_cb *self = (struct ircomm_cb *) instance;
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IRDA_DEBUG(4, "%s()\n", __func__ );
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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if (self->notify.flow_indication)
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self->notify.flow_indication(self->notify.instance, self, cmd);
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}
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