--- /dev/null
+/*********************************************************************
+ *
+ * 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);
+}
+
+
Code Review / kvmfornfv.git / blobdiff