--- /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;
+}
Code Review / kvmfornfv.git / blobdiff