351 lines
9.3 KiB
C
351 lines
9.3 KiB
C
/*********************************************************************
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*
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* Filename: ircomm_lmp.c
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* Version: 1.0
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* Description: Interface between IrCOMM and IrLMP
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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: Sun Dec 12 13:44:17 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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* Sources: Previous IrLPT work by Thomas Davis
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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, see <http://www.gnu.org/licenses/>.
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*
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********************************************************************/
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#include <linux/init.h>
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#include <linux/gfp.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/irda_device.h> /* struct irda_skb_cb */
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#include <net/irda/ircomm_event.h>
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#include <net/irda/ircomm_lmp.h>
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/*
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* Function ircomm_lmp_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_lmp_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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/* 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 = irlmp_connect_request(self->lsap, info->dlsap_sel,
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info->saddr, info->daddr, NULL, userdata);
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return ret;
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}
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/*
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* Function ircomm_lmp_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_lmp_connect_response(struct ircomm_cb *self,
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struct sk_buff *userdata)
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{
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struct sk_buff *tx_skb;
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/* Any userdata supplied? */
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if (userdata == NULL) {
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tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
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if (!tx_skb)
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return -ENOMEM;
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/* Reserve space for MUX and LAP header */
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skb_reserve(tx_skb, LMP_MAX_HEADER);
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} else {
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/*
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* Check that the client has reserved enough space for
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* headers
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*/
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IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
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return -1;);
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/* Don't forget to refcount it - should be NULL anyway */
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skb_get(userdata);
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tx_skb = userdata;
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}
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return irlmp_connect_response(self->lsap, tx_skb);
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}
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static int ircomm_lmp_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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struct sk_buff *tx_skb;
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int ret;
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if (!userdata) {
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tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
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if (!tx_skb)
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return -ENOMEM;
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/* Reserve space for MUX and LAP header */
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skb_reserve(tx_skb, LMP_MAX_HEADER);
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userdata = tx_skb;
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} else {
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/* Don't forget to refcount it - should be NULL anyway */
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skb_get(userdata);
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}
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ret = irlmp_disconnect_request(self->lsap, userdata);
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return ret;
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}
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/*
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* Function ircomm_lmp_flow_control (skb)
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*
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* This function is called when a data frame we have sent to IrLAP has
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* been deallocated. We do this to make sure we don't flood IrLAP with
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* frames, since we are not using the IrTTP flow control mechanism
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*/
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static void ircomm_lmp_flow_control(struct sk_buff *skb)
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{
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struct irda_skb_cb *cb;
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struct ircomm_cb *self;
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int line;
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IRDA_ASSERT(skb != NULL, return;);
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cb = (struct irda_skb_cb *) skb->cb;
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line = cb->line;
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self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
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if (!self) {
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pr_debug("%s(), didn't find myself\n", __func__);
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return;
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}
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
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self->pkt_count--;
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if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
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pr_debug("%s(), asking TTY to start again!\n", __func__);
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self->flow_status = FLOW_START;
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if (self->notify.flow_indication)
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self->notify.flow_indication(self->notify.instance,
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self, FLOW_START);
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}
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}
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/*
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* Function ircomm_lmp_data_request (self, userdata)
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*
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* Send data frame to peer device
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*
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*/
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static int ircomm_lmp_data_request(struct ircomm_cb *self,
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struct sk_buff *skb,
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int not_used)
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{
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struct irda_skb_cb *cb;
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int ret;
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IRDA_ASSERT(skb != NULL, return -1;);
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cb = (struct irda_skb_cb *) skb->cb;
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cb->line = self->line;
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pr_debug("%s(), sending frame\n", __func__);
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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_orphan(skb);
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skb->destructor = ircomm_lmp_flow_control;
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if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
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pr_debug("%s(), asking TTY to slow down!\n", __func__);
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self->flow_status = FLOW_STOP;
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if (self->notify.flow_indication)
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self->notify.flow_indication(self->notify.instance,
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self, FLOW_STOP);
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}
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ret = irlmp_data_request(self->lsap, skb);
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if (ret) {
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net_err_ratelimited("%s(), failed\n", __func__);
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/* irlmp_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_lmp_data_indication (instance, sap, skb)
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*
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* Incoming data which we must deliver to the state machine, to check
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* we are still connected.
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*/
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static int ircomm_lmp_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_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_LMP_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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/*
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* Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
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* max_header_size, skb)
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*
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* Connection has been confirmed by peer device
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*
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*/
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static void ircomm_lmp_connect_confirm(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_seg_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_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, return;);
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info.max_data_size = max_seg_size;
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info.max_header_size = max_header_size;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
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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_lmp_connect_indication (instance, sap, qos, max_sdu_size,
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* max_header_size, skb)
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*
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* Peer device wants to make a connection with us
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*
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*/
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static void ircomm_lmp_connect_indication(void *instance, void *sap,
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struct qos_info *qos,
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__u32 max_seg_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_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, return;);
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info.max_data_size = max_seg_size;
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info.max_header_size = max_header_size;
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info.qos = qos;
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ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
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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_lmp_disconnect_indication (instance, sap, reason, skb)
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*
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* Peer device has closed the connection, or the link went down for some
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* other reason
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*/
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static void ircomm_lmp_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_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_LMP_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_open_lsap (self)
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*
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* Open LSAP. This function will only be used when using "raw" services
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*
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*/
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int ircomm_open_lsap(struct ircomm_cb *self)
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{
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notify_t notify;
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/* Register callbacks */
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irda_notify_init(¬ify);
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notify.data_indication = ircomm_lmp_data_indication;
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notify.connect_confirm = ircomm_lmp_connect_confirm;
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notify.connect_indication = ircomm_lmp_connect_indication;
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notify.disconnect_indication = ircomm_lmp_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->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0);
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if (!self->lsap) {
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pr_debug("%sfailed to allocate tsap\n", __func__);
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return -1;
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}
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self->slsap_sel = self->lsap->slsap_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_lmp_data_request;
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self->issue.connect_request = ircomm_lmp_connect_request;
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self->issue.connect_response = ircomm_lmp_connect_response;
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self->issue.disconnect_request = ircomm_lmp_disconnect_request;
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return 0;
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}
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