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* Filename: irttp.h
* Version: 1.0
* Description: Tiny Transport Protocol (TTP) definitions
* Status: Experimental.
* Author: Dag Brattli <>
* Created at: Sun Aug 31 20:14:31 1997
* Modified at: Sun Dec 12 13:09:07 1999
* Modified by: Dag Brattli <>
* Copyright (c) 1998-1999 Dag Brattli <>,
* All Rights Reserved.
* Copyright (c) 2000-2002 Jean Tourrilhes <>
* 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.
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
#ifndef IRTTP_H
#define IRTTP_H
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <net/irda/irda.h>
#include <net/irda/irlmp.h> /* struct lsap_cb */
#include <net/irda/qos.h> /* struct qos_info */
#include <net/irda/irqueue.h>
#define TTP_HEADER 1
#define TTP_SAR_HEADER 5
#define TTP_PARAMETERS 0x80
#define TTP_MORE 0x80
/* Transmission queue sizes */
/* Worst case scenario, two window of data - Jean II */
#define TTP_TX_MAX_QUEUE 14
/* We need to keep at least 5 frames to make sure that we can refill
* appropriately the LAP layer. LAP keeps only two buffers, and we need
* to have 7 to make a full window - Jean II */
/* Most clients are synchronous with respect to flow control, so we can
* keep a low number of Tx buffers in TTP - Jean II */
/* Receive queue sizes */
/* Minimum of credit that the peer should hold.
* If the peer has less credits than 9 frames, we will explicitly send
* him some credits (through irttp_give_credit() and a specific frame).
* Note that when we give credits it's likely that it won't be sent in
* this LAP window, but in the next one. So, we make sure that the peer
* has something to send while waiting for credits (one LAP window == 7
* + 1 frames while he process the credits). - Jean II */
/* This is the default maximum number of credits held by the peer, so the
* default maximum number of frames he can send us before needing flow
* control answer from us (this may be negociated differently at TSAP setup).
* We want to minimise the number of times we have to explicitly send some
* credit to the peer, hoping we can piggyback it on the return data. In
* particular, it doesn't make sense for us to send credit more than once
* per LAP window.
* Moreover, giving credits has some latency, so we need strictly more than
* a LAP window, otherwise we may already have credits in our Tx queue.
* But on the other hand, we don't want to keep too many Rx buffer here
* before starting to flow control the other end, so make it exactly one
* LAP window + 1 + MIN_CREDITS. - Jean II */
/* Maximum number of credits we can allow the peer to have, and therefore
* maximum Rx queue size.
* Note that we try to deliver packets to the higher layer every time we
* receive something, so in normal mode the Rx queue will never contains
* more than one or two packets. - Jean II */
#define TTP_RX_MAX_CREDIT 21
/* What clients should use when calling ttp_open_tsap() */
/* Some priorities for disconnect requests */
#define P_NORMAL 0
#define P_HIGH 1
#define TTP_SAR_UNBOUND 0xffffffff
/* Parameters */
#define TTP_MAX_SDU_SIZE 0x01
* This structure contains all data associated with one instance of a TTP
* connection.
struct tsap_cb {
irda_queue_t q; /* Must be first */
magic_t magic; /* Just in case */
__u8 stsap_sel; /* Source TSAP */
__u8 dtsap_sel; /* Destination TSAP */
struct lsap_cb *lsap; /* Corresponding LSAP to this TSAP */
__u8 connected; /* TSAP connected */
__u8 initial_credit; /* Initial credit to give peer */
int avail_credit; /* Available credit to return to peer */
int remote_credit; /* Credit held by peer TTP entity */
int send_credit; /* Credit held by local TTP entity */
struct sk_buff_head tx_queue; /* Frames to be transmitted */
struct sk_buff_head rx_queue; /* Received frames */
struct sk_buff_head rx_fragments;
int tx_queue_lock;
int rx_queue_lock;
spinlock_t lock;
notify_t notify; /* Callbacks to client layer */
struct net_device_stats stats;
struct timer_list todo_timer;
__u32 max_seg_size; /* Max data that fit into an IrLAP frame */
__u8 max_header_size;
int rx_sdu_busy; /* RxSdu.busy */
__u32 rx_sdu_size; /* Current size of a partially received frame */
__u32 rx_max_sdu_size; /* Max receive user data size */
int tx_sdu_busy; /* TxSdu.busy */
__u32 tx_max_sdu_size; /* Max transmit user data size */
int close_pend; /* Close, but disconnect_pend */
unsigned long disconnect_pend; /* Disconnect, but still data to send */
struct sk_buff *disconnect_skb;
struct irttp_cb {
magic_t magic;
hashbin_t *tsaps;
int irttp_init(void);
void irttp_cleanup(void);
struct tsap_cb *irttp_open_tsap(__u8 stsap_sel, int credit, notify_t *notify);
int irttp_close_tsap(struct tsap_cb *self);
int irttp_data_request(struct tsap_cb *self, struct sk_buff *skb);
int irttp_udata_request(struct tsap_cb *self, struct sk_buff *skb);
int irttp_connect_request(struct tsap_cb *self, __u8 dtsap_sel,
__u32 saddr, __u32 daddr,
struct qos_info *qos, __u32 max_sdu_size,
struct sk_buff *userdata);
int irttp_connect_response(struct tsap_cb *self, __u32 max_sdu_size,
struct sk_buff *userdata);
int irttp_disconnect_request(struct tsap_cb *self, struct sk_buff *skb,
int priority);
void irttp_flow_request(struct tsap_cb *self, LOCAL_FLOW flow);
struct tsap_cb *irttp_dup(struct tsap_cb *self, void *instance);
static inline __u32 irttp_get_saddr(struct tsap_cb *self)
return irlmp_get_saddr(self->lsap);
static inline __u32 irttp_get_daddr(struct tsap_cb *self)
return irlmp_get_daddr(self->lsap);
static inline __u32 irttp_get_max_seg_size(struct tsap_cb *self)
return self->max_seg_size;
/* After doing a irttp_dup(), this get one of the two socket back into
* a state where it's waiting incomming connections.
* Note : this can be used *only* if the socket is not yet connected
* (i.e. NO irttp_connect_response() done on this socket).
* - Jean II */
static inline void irttp_listen(struct tsap_cb *self)
self->dtsap_sel = LSAP_ANY;
/* Return TRUE if the node is in primary mode (i.e. master)
* - Jean II */
static inline int irttp_is_primary(struct tsap_cb *self)
if ((self == NULL) ||
(self->lsap == NULL) ||
(self->lsap->lap == NULL) ||
(self->lsap->lap->irlap == NULL))
return -2;
#endif /* IRTTP_H */