x25.h

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/*
 *  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 <linux/slab.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_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 */

/* Bitset in x25_sock->flags for misc flags */
#define X25_Q_BIT_FLAG      0
#define X25_INTERRUPT_FLAG  1
#define X25_ACCPT_APPRV_FLAG    2

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;
    unsigned short      vs, vr, va, vl;
    unsigned long       t2, t21, t22, t23;
    unsigned short      fraglen;
    unsigned long       flags;
    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_parse_address_block(struct sk_buff *skb,
        struct x25_address *called_addr,
        struct x25_address *calling_addr);

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_from_timer(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 */
#ifdef CONFIG_SYSCTL
extern void x25_register_sysctl(void);
extern void x25_unregister_sysctl(void);
#else
static inline void x25_register_sysctl(void) {};
static inline void x25_unregister_sysctl(void) {};
#endif /* CONFIG_SYSCTL */

struct x25_skb_cb {
    unsigned int 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 struct list_head x25_neigh_list;
extern rwlock_t x25_neigh_list_lock;

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