| /********************************************************************* |
| * |
| * 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * |
| ********************************************************************/ |
| |
| #include <linux/sched.h> |
| #include <linux/init.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; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| /* 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; |
| int ret; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| /* Any userdata supplied? */ |
| if (userdata == NULL) { |
| tx_skb = alloc_skb(64, 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; |
| } |
| |
| ret = irlmp_connect_response(self->lsap, tx_skb); |
| |
| return 0; |
| } |
| |
| 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; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| if (!userdata) { |
| tx_skb = alloc_skb(64, 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; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| |
| line = cb->line; |
| |
| self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); |
| if (!self) { |
| IRDA_DEBUG(2, "%s(), didn't find myself\n", __FUNCTION__ ); |
| 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)) { |
| IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __FUNCTION__ ); |
| 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; |
| |
| IRDA_DEBUG(4, "%s(), sending frame\n", __FUNCTION__ ); |
| |
| /* Don't forget to refcount it - see ircomm_tty_do_softint() */ |
| skb_get(skb); |
| |
| skb->destructor = ircomm_lmp_flow_control; |
| |
| if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { |
| IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __FUNCTION__ ); |
| 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) { |
| IRDA_ERROR("%s(), failed\n", __FUNCTION__); |
| /* 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_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| |
| 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_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| 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_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| 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_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| 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; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| |
| /* 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) { |
| IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __FUNCTION__ ); |
| 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; |
| } |