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root/include/net/x25.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. x25_sk
  2. x25_neigh_hold
  3. x25_neigh_put
  4. x25_route_hold
  5. x25_route_put

/*
 *      Declarations of X.25 Packet Layer type objects.
 *
 *      History
 *      nov/17/96       Jonathan Naylor   Initial version.              
 *      mar/20/00       Daniela Squassoni Disabling/enabling of facilities 
 *                                        negotiation.
 */

#ifndef _X25_H
#define _X25_H 
#include <linux/x25.h>
#include <net/sock.h>

#define X25_ADDR_LEN                    16

#define X25_MAX_L2_LEN                  18      /* 802.2 LLC */

#define X25_STD_MIN_LEN                 3
#define X25_EXT_MIN_LEN                 4

#define X25_GFI_SEQ_MASK                0x30
#define X25_GFI_STDSEQ                  0x10
#define X25_GFI_EXTSEQ                  0x20

#define X25_Q_BIT                       0x80
#define X25_D_BIT                       0x40
#define X25_STD_M_BIT                   0x10
#define X25_EXT_M_BIT                   0x01

#define X25_CALL_REQUEST                0x0B
#define X25_CALL_ACCEPTED               0x0F
#define X25_CLEAR_REQUEST               0x13
#define X25_CLEAR_CONFIRMATION          0x17
#define X25_DATA                        0x00
#define X25_INTERRUPT                   0x23
#define X25_INTERRUPT_CONFIRMATION      0x27
#define X25_RR                          0x01
#define X25_RNR                         0x05
#define X25_REJ                         0x09
#define X25_RESET_REQUEST               0x1B
#define X25_RESET_CONFIRMATION          0x1F
#define X25_REGISTRATION_REQUEST        0xF3
#define X25_REGISTRATION_CONFIRMATION   0xF7
#define X25_RESTART_REQUEST             0xFB
#define X25_RESTART_CONFIRMATION        0xFF
#define X25_DIAGNOSTIC                  0xF1
#define X25_ILLEGAL                     0xFD

/* Define the various conditions that may exist */

#define X25_COND_ACK_PENDING    0x01
#define X25_COND_OWN_RX_BUSY    0x02
#define X25_COND_PEER_RX_BUSY   0x04

/* Define Link State constants. */
enum {
        X25_STATE_0,            /* Ready */
        X25_STATE_1,            /* Awaiting Call Accepted */
        X25_STATE_2,            /* Awaiting Clear Confirmation */
        X25_STATE_3,            /* Data Transfer */
        X25_STATE_4             /* Awaiting Reset Confirmation */
};

enum {
        X25_LINK_STATE_0,
        X25_LINK_STATE_1,
        X25_LINK_STATE_2,
        X25_LINK_STATE_3
};

#define X25_DEFAULT_T20         (180 * HZ)              /* Default T20 value */
#define X25_DEFAULT_T21         (200 * HZ)              /* Default T21 value */
#define X25_DEFAULT_T22         (180 * HZ)              /* Default T22 value */
#define X25_DEFAULT_T23         (180 * HZ)              /* Default T23 value */
#define X25_DEFAULT_T2          (3   * HZ)              /* Default ack holdback value */

#define X25_DEFAULT_WINDOW_SIZE 2                       /* Default Window Size  */
#define X25_DEFAULT_PACKET_SIZE X25_PS128               /* Default Packet Size */
#define X25_DEFAULT_THROUGHPUT  0x0A                    /* Deafult Throughput */
#define X25_DEFAULT_REVERSE     0x00                    /* Default Reverse Charging */
#define X25_DENY_ACCPT_APPRV   0x01                     /* Default value */
#define X25_ALLOW_ACCPT_APPRV  0x00                     /* Control enabled */

#define X25_SMODULUS            8
#define X25_EMODULUS            128

/*
 *      X.25 Facilities constants.
 */

#define X25_FAC_CLASS_MASK      0xC0

#define X25_FAC_CLASS_A         0x00
#define X25_FAC_CLASS_B         0x40
#define X25_FAC_CLASS_C         0x80
#define X25_FAC_CLASS_D         0xC0

#define X25_FAC_REVERSE         0x01                    /* also fast select */
#define X25_FAC_THROUGHPUT      0x02
#define X25_FAC_PACKET_SIZE     0x42
#define X25_FAC_WINDOW_SIZE     0x43

#define X25_MAX_FAC_LEN         60
#define X25_MAX_CUD_LEN         128

#define X25_FAC_CALLING_AE      0xCB
#define X25_FAC_CALLED_AE       0xC9

#define X25_MARKER              0x00
#define X25_DTE_SERVICES        0x0F
#define X25_MAX_AE_LEN          40                      /* Max num of semi-octets in AE - OSI Nw */
#define X25_MAX_DTE_FACIL_LEN   21                      /* Max length of DTE facility params */

/**
 *      struct x25_route - x25 routing entry
 *      @node - entry in x25_list_lock
 *      @address - Start of address range
 *      @sigdigits - Number of sig digits
 *      @dev - More than one for MLP
 *      @refcnt - reference counter
 */
struct x25_route {
        struct list_head        node;           
        struct x25_address      address;
        unsigned int            sigdigits;
        struct net_device       *dev;
        atomic_t                refcnt;
};

struct x25_neigh {
        struct list_head        node;
        struct net_device       *dev;
        unsigned int            state;
        unsigned int            extended;
        struct sk_buff_head     queue;
        unsigned long           t20;
        struct timer_list       t20timer;
        unsigned long           global_facil_mask;
        atomic_t                refcnt;
};

struct x25_sock {
        struct sock             sk;
        struct x25_address      source_addr, dest_addr;
        struct x25_neigh        *neighbour;
        unsigned int            lci, cudmatchlength;
        unsigned char           state, condition, qbitincl, intflag, accptapprv;
        unsigned short          vs, vr, va, vl;
        unsigned long           t2, t21, t22, t23;
        unsigned short          fraglen;
        struct sk_buff_head     ack_queue;
        struct sk_buff_head     fragment_queue;
        struct sk_buff_head     interrupt_in_queue;
        struct sk_buff_head     interrupt_out_queue;
        struct timer_list       timer;
        struct x25_causediag    causediag;
        struct x25_facilities   facilities;
        struct x25_dte_facilities dte_facilities;
        struct x25_calluserdata calluserdata;
        unsigned long           vc_facil_mask;  /* inc_call facilities mask */
};

struct x25_forward {
        struct list_head        node;
        unsigned int            lci;
        struct net_device       *dev1;
        struct net_device       *dev2;
        atomic_t                refcnt;
};

static inline struct x25_sock *x25_sk(const struct sock *sk)
{
        return (struct x25_sock *)sk;
}

/* af_x25.c */
extern int  sysctl_x25_restart_request_timeout;
extern int  sysctl_x25_call_request_timeout;
extern int  sysctl_x25_reset_request_timeout;
extern int  sysctl_x25_clear_request_timeout;
extern int  sysctl_x25_ack_holdback_timeout;
extern int  sysctl_x25_forward;

extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
                          struct x25_address *);
extern int  x25_addr_aton(unsigned char *, struct x25_address *,
                          struct x25_address *);
extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
extern void x25_destroy_socket(struct sock *);
extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
extern void x25_kill_by_neigh(struct x25_neigh *);

/* x25_dev.c */
extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
extern void x25_establish_link(struct x25_neigh *);
extern void x25_terminate_link(struct x25_neigh *);

/* x25_facilities.c */
extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
                                struct x25_dte_facilities *, unsigned long *);
extern int x25_create_facilities(unsigned char *, struct x25_facilities *,
                                struct x25_dte_facilities *, unsigned long);
extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
                                struct x25_facilities *,
                                struct x25_dte_facilities *);
extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);

/* x25_forward.c */
extern void x25_clear_forward_by_lci(unsigned int lci);
extern void x25_clear_forward_by_dev(struct net_device *);
extern int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
extern int x25_forward_call(struct x25_address *, struct x25_neigh *,
                                struct sk_buff *, int);

/* x25_in.c */
extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);

/* x25_link.c */
extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
extern void x25_link_device_up(struct net_device *);
extern void x25_link_device_down(struct net_device *);
extern void x25_link_established(struct x25_neigh *);
extern void x25_link_terminated(struct x25_neigh *);
extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
extern int  x25_subscr_ioctl(unsigned int, void __user *);
extern struct x25_neigh *x25_get_neigh(struct net_device *);
extern void x25_link_free(void);

/* x25_neigh.c */
static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
{
        atomic_inc(&nb->refcnt);
}

static __inline__ void x25_neigh_put(struct x25_neigh *nb)
{
        if (atomic_dec_and_test(&nb->refcnt))
                kfree(nb);
}

/* x25_out.c */
extern  int x25_output(struct sock *, struct sk_buff *);
extern void x25_kick(struct sock *);
extern void x25_enquiry_response(struct sock *);

/* x25_route.c */
extern struct x25_route *x25_get_route(struct x25_address *addr);
extern struct net_device *x25_dev_get(char *);
extern void x25_route_device_down(struct net_device *dev);
extern int  x25_route_ioctl(unsigned int, void __user *);
extern void x25_route_free(void);

static __inline__ void x25_route_hold(struct x25_route *rt)
{
        atomic_inc(&rt->refcnt);
}

static __inline__ void x25_route_put(struct x25_route *rt)
{
        if (atomic_dec_and_test(&rt->refcnt))
                kfree(rt);
}

/* x25_subr.c */
extern void x25_clear_queues(struct sock *);
extern void x25_frames_acked(struct sock *, unsigned short);
extern void x25_requeue_frames(struct sock *);
extern int  x25_validate_nr(struct sock *, unsigned short);
extern void x25_write_internal(struct sock *, int);
extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);

/* x25_timer.c */
extern void x25_init_timers(struct sock *sk);
extern void x25_start_heartbeat(struct sock *);
extern void x25_start_t2timer(struct sock *);
extern void x25_start_t21timer(struct sock *);
extern void x25_start_t22timer(struct sock *);
extern void x25_start_t23timer(struct sock *);
extern void x25_stop_heartbeat(struct sock *);
extern void x25_stop_timer(struct sock *);
extern unsigned long x25_display_timer(struct sock *);
extern void x25_check_rbuf(struct sock *);

/* sysctl_net_x25.c */
extern void x25_register_sysctl(void);
extern void x25_unregister_sysctl(void);
struct x25_skb_cb {
        unsigned flags;
};
#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))

extern struct hlist_head x25_list;
extern rwlock_t x25_list_lock;
extern struct list_head x25_route_list;
extern rwlock_t x25_route_list_lock;
extern struct list_head x25_forward_list;
extern rwlock_t x25_forward_list_lock;

extern int x25_proc_init(void);
extern void x25_proc_exit(void);
#endif

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