+++ /dev/null
-/*********************************************************************
- *
- * Filename: ircomm_lmp.c
- * Version: 1.0
- * Description: Interface between IrCOMM and IrLMP
- * Status: Stable
- * Author: Dag Brattli <dagb@cs.uit.no>
- * Created at: Sun Jun 6 20:48:27 1999
- * Modified at: Sun Dec 12 13:44:17 1999
- * Modified by: Dag Brattli <dagb@cs.uit.no>
- * Sources: Previous IrLPT work by Thomas Davis
- *
- * 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 <linux/gfp.h>
-
-#include <net/irda/irda.h>
-#include <net/irda/irlmp.h>
-#include <net/irda/iriap.h>
-#include <net/irda/irda_device.h> /* struct irda_skb_cb */
-
-#include <net/irda/ircomm_event.h>
-#include <net/irda/ircomm_lmp.h>
-
-
-/*
- * Function ircomm_lmp_connect_request (self, userdata)
- *
- *
- *
- */
-static int ircomm_lmp_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 = irlmp_connect_request(self->lsap, info->dlsap_sel,
- info->saddr, info->daddr, NULL, userdata);
- return ret;
-}
-
-/*
- * Function ircomm_lmp_connect_response (self, skb)
- *
- *
- *
- */
-static int ircomm_lmp_connect_response(struct ircomm_cb *self,
- struct sk_buff *userdata)
-{
- struct sk_buff *tx_skb;
-
- /* Any userdata supplied? */
- if (userdata == NULL) {
- tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
- if (!tx_skb)
- return -ENOMEM;
-
- /* Reserve space for MUX and LAP header */
- skb_reserve(tx_skb, LMP_MAX_HEADER);
- } else {
- /*
- * Check that the client has reserved enough space for
- * headers
- */
- IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
- return -1;);
-
- /* Don't forget to refcount it - should be NULL anyway */
- skb_get(userdata);
- tx_skb = userdata;
- }
-
- return irlmp_connect_response(self->lsap, tx_skb);
-}
-
-static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
- struct sk_buff *userdata,
- struct ircomm_info *info)
-{
- struct sk_buff *tx_skb;
- int ret;
-
- if (!userdata) {
- tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
- if (!tx_skb)
- return -ENOMEM;
-
- /* Reserve space for MUX and LAP header */
- skb_reserve(tx_skb, LMP_MAX_HEADER);
- userdata = tx_skb;
- } else {
- /* Don't forget to refcount it - should be NULL anyway */
- skb_get(userdata);
- }
-
- ret = irlmp_disconnect_request(self->lsap, userdata);
-
- return ret;
-}
-
-/*
- * Function ircomm_lmp_flow_control (skb)
- *
- * This function is called when a data frame we have sent to IrLAP has
- * been deallocated. We do this to make sure we don't flood IrLAP with
- * frames, since we are not using the IrTTP flow control mechanism
- */
-static void ircomm_lmp_flow_control(struct sk_buff *skb)
-{
- struct irda_skb_cb *cb;
- struct ircomm_cb *self;
- int line;
-
- IRDA_ASSERT(skb != NULL, return;);
-
- cb = (struct irda_skb_cb *) skb->cb;
-
- line = cb->line;
-
- self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
- if (!self) {
- pr_debug("%s(), didn't find myself\n", __func__);
- return;
- }
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
-
- self->pkt_count--;
-
- if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
- pr_debug("%s(), asking TTY to start again!\n", __func__);
- self->flow_status = FLOW_START;
- if (self->notify.flow_indication)
- self->notify.flow_indication(self->notify.instance,
- self, FLOW_START);
- }
-}
-
-/*
- * Function ircomm_lmp_data_request (self, userdata)
- *
- * Send data frame to peer device
- *
- */
-static int ircomm_lmp_data_request(struct ircomm_cb *self,
- struct sk_buff *skb,
- int not_used)
-{
- struct irda_skb_cb *cb;
- int ret;
-
- IRDA_ASSERT(skb != NULL, return -1;);
-
- cb = (struct irda_skb_cb *) skb->cb;
-
- cb->line = self->line;
-
- pr_debug("%s(), sending frame\n", __func__);
-
- /* Don't forget to refcount it - see ircomm_tty_do_softint() */
- skb_get(skb);
-
- skb_orphan(skb);
- skb->destructor = ircomm_lmp_flow_control;
-
- if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
- pr_debug("%s(), asking TTY to slow down!\n", __func__);
- self->flow_status = FLOW_STOP;
- if (self->notify.flow_indication)
- self->notify.flow_indication(self->notify.instance,
- self, FLOW_STOP);
- }
- ret = irlmp_data_request(self->lsap, skb);
- if (ret) {
- net_err_ratelimited("%s(), failed\n", __func__);
- /* irlmp_data_request already free the packet */
- }
-
- return ret;
-}
-
-/*
- * Function ircomm_lmp_data_indication (instance, sap, skb)
- *
- * Incoming data which we must deliver to the state machine, to check
- * we are still connected.
- */
-static int ircomm_lmp_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_LMP_DATA_INDICATION, skb, NULL);
-
- /* Drop reference count - see ircomm_tty_data_indication(). */
- dev_kfree_skb(skb);
-
- return 0;
-}
-
-/*
- * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
- * max_header_size, skb)
- *
- * Connection has been confirmed by peer device
- *
- */
-static void ircomm_lmp_connect_confirm(void *instance, void *sap,
- struct qos_info *qos,
- __u32 max_seg_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, return;);
-
- info.max_data_size = max_seg_size;
- info.max_header_size = max_header_size;
- info.qos = qos;
-
- ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
-
- /* Drop reference count - see ircomm_tty_connect_confirm(). */
- dev_kfree_skb(skb);
-}
-
-/*
- * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
- * max_header_size, skb)
- *
- * Peer device wants to make a connection with us
- *
- */
-static void ircomm_lmp_connect_indication(void *instance, void *sap,
- struct qos_info *qos,
- __u32 max_seg_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, return;);
-
- info.max_data_size = max_seg_size;
- info.max_header_size = max_header_size;
- info.qos = qos;
-
- ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
-
- /* Drop reference count - see ircomm_tty_connect_indication(). */
- dev_kfree_skb(skb);
-}
-
-/*
- * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
- *
- * Peer device has closed the connection, or the link went down for some
- * other reason
- */
-static void ircomm_lmp_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_LMP_DISCONNECT_INDICATION, skb, &info);
-
- /* Drop reference count - see ircomm_tty_disconnect_indication(). */
- if(skb)
- dev_kfree_skb(skb);
-}
-/*
- * Function ircomm_open_lsap (self)
- *
- * Open LSAP. This function will only be used when using "raw" services
- *
- */
-int ircomm_open_lsap(struct ircomm_cb *self)
-{
- notify_t notify;
-
- /* Register callbacks */
- irda_notify_init(¬ify);
- notify.data_indication = ircomm_lmp_data_indication;
- notify.connect_confirm = ircomm_lmp_connect_confirm;
- notify.connect_indication = ircomm_lmp_connect_indication;
- notify.disconnect_indication = ircomm_lmp_disconnect_indication;
- notify.instance = self;
- strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
-
- self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0);
- if (!self->lsap) {
- pr_debug("%sfailed to allocate tsap\n", __func__);
- return -1;
- }
- self->slsap_sel = self->lsap->slsap_sel;
-
- /*
- * Initialize the call-table for issuing commands
- */
- self->issue.data_request = ircomm_lmp_data_request;
- self->issue.connect_request = ircomm_lmp_connect_request;
- self->issue.connect_response = ircomm_lmp_connect_response;
- self->issue.disconnect_request = ircomm_lmp_disconnect_request;
-
- return 0;
-}
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