/*********************************************************************
*
* Filename: irlmp.h
* Version: 0.9
* Description: IrDA Link Management Protocol (LMP) layer
* Status: Experimental.
* Author: Dag Brattli <[email protected]>
* Created at: Sun Aug 17 20:54:32 1997
* Modified at: Fri Dec 10 13:23:01 1999
* Modified by: Dag Brattli <[email protected]>
*
* Copyright (c) 1998-1999 Dag Brattli <[email protected]>,
* All Rights Reserved.
* Copyright (c) 2000-2002 Jean Tourrilhes <[email protected]>
*
* 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 IRLMP_H
#define IRLMP_H

#include <asm/param.h> /* for HZ */

#include <linux/types.h>

#include <net/irda/irda.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h> /* LAP_MAX_HEADER, ... */
#include <net/irda/irlmp_event.h>
#include <net/irda/irqueue.h>
#include <net/irda/discovery.h>

/* LSAP-SEL's */
#define LSAP_MASK 0x7f
#define LSAP_IAS 0x00
#define LSAP_ANY 0xff
#define LSAP_MAX 0x6f /* 0x70-0x7f are reserved */
#define LSAP_CONNLESS 0x70 /* Connectionless LSAP, mostly used for Ultra */

#define DEV_ADDR_ANY 0xffffffff

#define LMP_HEADER 2 /* Dest LSAP + Source LSAP */
#define LMP_CONTROL_HEADER 4 /* LMP_HEADER + opcode + parameter */
#define LMP_PID_HEADER 1 /* Used by Ultra */
#define LMP_MAX_HEADER (LMP_CONTROL_HEADER+LAP_MAX_HEADER)

#define LM_MAX_CONNECTIONS 10

#define LM_IDLE_TIMEOUT 2*HZ /* 2 seconds for now */

typedef enum {
S_PNP = 0,
S_PDA,
S_COMPUTER,
S_PRINTER,
S_MODEM,
S_FAX,
S_LAN,
S_TELEPHONY,
S_COMM,
S_OBEX,
S_ANY,
S_END,
} SERVICE;

/* For selective discovery */
typedef void (*DISCOVERY_CALLBACK1) (discinfo_t *, DISCOVERY_MODE, void *);
/* For expiry (the same) */
typedef void (*DISCOVERY_CALLBACK2) (discinfo_t *, DISCOVERY_MODE, void *);

typedef struct {
irda_queue_t queue; /* Must be first */

__u16_host_order hints; /* Hint bits */
} irlmp_service_t;

typedef struct {
irda_queue_t queue; /* Must be first */

__u16_host_order hint_mask;

DISCOVERY_CALLBACK1 disco_callback; /* Selective discovery */
DISCOVERY_CALLBACK2 expir_callback; /* Selective expiration */
void *priv; /* Used to identify client */
} irlmp_client_t;

/*
* Information about each logical LSAP connection
*/
struct lsap_cb {
irda_queue_t queue; /* Must be first */
magic_t magic;

unsigned long connected; /* set_bit used on this */
int persistent;

__u8 slsap_sel; /* Source (this) LSAP address */
__u8 dlsap_sel; /* Destination LSAP address (if connected) */
#ifdef CONFIG_IRDA_ULTRA
__u8 pid; /* Used by connectionless LSAP */
#endif /* CONFIG_IRDA_ULTRA */
struct sk_buff *conn_skb; /* Store skb here while connecting */

struct timer_list watchdog_timer;

LSAP_STATE lsap_state; /* Connection state */
notify_t notify; /* Indication/Confirm entry points */
struct qos_info qos; /* QoS for this connection */

struct lap_cb *lap; /* Pointer to LAP connection structure */
};

/*
* Used for caching the last slsap->dlsap->handle mapping
*
* We don't need to keep/match the remote address in the cache because
* we are associated with a specific LAP (which implies it).
* Jean II
*/
typedef struct {
int valid;

__u8 slsap_sel;
__u8 dlsap_sel;
struct lsap_cb *lsap;
} CACHE_ENTRY;

/*
* Information about each registered IrLAP layer
*/
struct lap_cb {
irda_queue_t queue; /* Must be first */
magic_t magic;

int reason; /* LAP disconnect reason */

IRLMP_STATE lap_state;

struct irlap_cb *irlap; /* Instance of IrLAP layer */
hashbin_t *lsaps; /* LSAP associated with this link */
struct lsap_cb *flow_next; /* Next lsap to be polled for Tx */

__u8 caddr; /* Connection address */
__u32 saddr; /* Source device address */
__u32 daddr; /* Destination device address */

struct qos_info *qos; /* LAP QoS for this session */
struct timer_list idle_timer;

#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
/* The lsap cache was moved from struct irlmp_cb to here because
* it must be associated with the specific LAP. Also, this
* improves performance. - Jean II */
CACHE_ENTRY cache; /* Caching last slsap->dlsap->handle mapping */
#endif
};

/*
* Main structure for IrLMP
*/
struct irlmp_cb {
magic_t magic;

__u8 conflict_flag;

discovery_t discovery_cmd; /* Discovery command to use by IrLAP */
discovery_t discovery_rsp; /* Discovery response to use by IrLAP */

/* Last lsap picked automatically by irlmp_find_free_slsap() */
int last_lsap_sel;

struct timer_list discovery_timer;

hashbin_t *links; /* IrLAP connection table */
hashbin_t *unconnected_lsaps;
hashbin_t *clients;
hashbin_t *services;

hashbin_t *cachelog; /* Current discovery log */

int running;

__u16_host_order hints; /* Hint bits */
};

/* Prototype declarations */
int irlmp_init(void);
void irlmp_cleanup(void);
struct lsap_cb *irlmp_open_lsap(__u8 slsap, notify_t *notify, __u8 pid);
void irlmp_close_lsap( struct lsap_cb *self);

__u16 irlmp_service_to_hint(int service);
void *irlmp_register_service(__u16 hints);
int irlmp_unregister_service(void *handle);
void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
DISCOVERY_CALLBACK2 expir_clb, void *priv);
int irlmp_unregister_client(void *handle);
int irlmp_update_client(void *handle, __u16 hint_mask,
DISCOVERY_CALLBACK1 disco_clb,
DISCOVERY_CALLBACK2 expir_clb, void *priv);

void irlmp_register_link(struct irlap_cb *, __u32 saddr, notify_t *);
void irlmp_unregister_link(__u32 saddr);

int irlmp_connect_request(struct lsap_cb *, __u8 dlsap_sel,
__u32 saddr, __u32 daddr,
struct qos_info *, struct sk_buff *);
void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb);
int irlmp_connect_response(struct lsap_cb *, struct sk_buff *);
void irlmp_connect_confirm(struct lsap_cb *, struct sk_buff *);
struct lsap_cb *irlmp_dup(struct lsap_cb *self, void *instance);

void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
struct sk_buff *userdata);
int irlmp_disconnect_request(struct lsap_cb *, struct sk_buff *userdata);

void irlmp_discovery_confirm(hashbin_t *discovery_log, DISCOVERY_MODE mode);
void irlmp_discovery_request(int nslots);
discinfo_t *irlmp_get_discoveries(int *pn, __u16 mask, int nslots);
void irlmp_do_expiry(void);
void irlmp_do_discovery(int nslots);
discovery_t *irlmp_get_discovery_response(void);
void irlmp_discovery_expiry(discinfo_t *expiry, int number);

int irlmp_data_request(struct lsap_cb *, struct sk_buff *);
void irlmp_data_indication(struct lsap_cb *, struct sk_buff *);

int irlmp_udata_request(struct lsap_cb *, struct sk_buff *);
void irlmp_udata_indication(struct lsap_cb *, struct sk_buff *);

#ifdef CONFIG_IRDA_ULTRA
int irlmp_connless_data_request(struct lsap_cb *, struct sk_buff *, __u8);
void irlmp_connless_data_indication(struct lsap_cb *, struct sk_buff *);
#endif /* CONFIG_IRDA_ULTRA */

void irlmp_status_indication(struct lap_cb *, LINK_STATUS link, LOCK_STATUS lock);
void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow);

LM_REASON irlmp_convert_lap_reason(LAP_REASON);

static inline __u32 irlmp_get_saddr(const struct lsap_cb *self)
{
return (self && self->lap) ? self->lap->saddr : 0;
}

static inline __u32 irlmp_get_daddr(const struct lsap_cb *self)
{
return (self && self->lap) ? self->lap->daddr : 0;
}

const char *irlmp_reason_str(LM_REASON reason);

extern int sysctl_discovery_timeout;
extern int sysctl_discovery_slots;
extern int sysctl_discovery;
extern int sysctl_lap_keepalive_time; /* in ms, default is LM_IDLE_TIMEOUT */
extern struct irlmp_cb *irlmp;

/* Check if LAP queue is full.
* Used by IrTTP for low control, see comments in irlap.h - Jean II */
static inline int irlmp_lap_tx_queue_full(struct lsap_cb *self)
{
if (self == NULL)
return 0;
if (self->lap == NULL)
return 0;
if (self->lap->irlap == NULL)
return 0;

return IRLAP_GET_TX_QUEUE_LEN(self->lap->irlap) >= LAP_HIGH_THRESHOLD;
}

/* After doing a irlmp_dup(), this get one of the two socket back into
* a state where it's waiting incoming connections.
* Note : this can be used *only* if the socket is not yet connected
* (i.e. NO irlmp_connect_response() done on this socket).
* - Jean II */
static inline void irlmp_listen(struct lsap_cb *self)
{
self->dlsap_sel = LSAP_ANY;
self->lap = NULL;
self->lsap_state = LSAP_DISCONNECTED;
/* Started when we received the LM_CONNECT_INDICATION */
del_timer(&self->watchdog_timer);
}

#endif