linux/include/net/x25.h
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   1/*
   2 *      Declarations of X.25 Packet Layer type objects.
   3 *
   4 *      History
   5 *      nov/17/96       Jonathan Naylor   Initial version.              
   6 *      mar/20/00       Daniela Squassoni Disabling/enabling of facilities 
   7 *                                        negotiation.
   8 */
   9
  10#ifndef _X25_H
  11#define _X25_H 
  12#include <linux/x25.h>
  13#include <linux/slab.h>
  14#include <net/sock.h>
  15
  16#define X25_ADDR_LEN                    16
  17
  18#define X25_MAX_L2_LEN                  18      /* 802.2 LLC */
  19
  20#define X25_STD_MIN_LEN                 3
  21#define X25_EXT_MIN_LEN                 4
  22
  23#define X25_GFI_SEQ_MASK                0x30
  24#define X25_GFI_STDSEQ                  0x10
  25#define X25_GFI_EXTSEQ                  0x20
  26
  27#define X25_Q_BIT                       0x80
  28#define X25_D_BIT                       0x40
  29#define X25_STD_M_BIT                   0x10
  30#define X25_EXT_M_BIT                   0x01
  31
  32#define X25_CALL_REQUEST                0x0B
  33#define X25_CALL_ACCEPTED               0x0F
  34#define X25_CLEAR_REQUEST               0x13
  35#define X25_CLEAR_CONFIRMATION          0x17
  36#define X25_DATA                        0x00
  37#define X25_INTERRUPT                   0x23
  38#define X25_INTERRUPT_CONFIRMATION      0x27
  39#define X25_RR                          0x01
  40#define X25_RNR                         0x05
  41#define X25_REJ                         0x09
  42#define X25_RESET_REQUEST               0x1B
  43#define X25_RESET_CONFIRMATION          0x1F
  44#define X25_REGISTRATION_REQUEST        0xF3
  45#define X25_REGISTRATION_CONFIRMATION   0xF7
  46#define X25_RESTART_REQUEST             0xFB
  47#define X25_RESTART_CONFIRMATION        0xFF
  48#define X25_DIAGNOSTIC                  0xF1
  49#define X25_ILLEGAL                     0xFD
  50
  51/* Define the various conditions that may exist */
  52
  53#define X25_COND_ACK_PENDING    0x01
  54#define X25_COND_OWN_RX_BUSY    0x02
  55#define X25_COND_PEER_RX_BUSY   0x04
  56
  57/* Define Link State constants. */
  58enum {
  59        X25_STATE_0,            /* Ready */
  60        X25_STATE_1,            /* Awaiting Call Accepted */
  61        X25_STATE_2,            /* Awaiting Clear Confirmation */
  62        X25_STATE_3,            /* Data Transfer */
  63        X25_STATE_4             /* Awaiting Reset Confirmation */
  64};
  65
  66enum {
  67        X25_LINK_STATE_0,
  68        X25_LINK_STATE_1,
  69        X25_LINK_STATE_2,
  70        X25_LINK_STATE_3
  71};
  72
  73#define X25_DEFAULT_T20         (180 * HZ)              /* Default T20 value */
  74#define X25_DEFAULT_T21         (200 * HZ)              /* Default T21 value */
  75#define X25_DEFAULT_T22         (180 * HZ)              /* Default T22 value */
  76#define X25_DEFAULT_T23         (180 * HZ)              /* Default T23 value */
  77#define X25_DEFAULT_T2          (3   * HZ)              /* Default ack holdback value */
  78
  79#define X25_DEFAULT_WINDOW_SIZE 2                       /* Default Window Size  */
  80#define X25_DEFAULT_PACKET_SIZE X25_PS128               /* Default Packet Size */
  81#define X25_DEFAULT_THROUGHPUT  0x0A                    /* Deafult Throughput */
  82#define X25_DEFAULT_REVERSE     0x00                    /* Default Reverse Charging */
  83
  84#define X25_SMODULUS            8
  85#define X25_EMODULUS            128
  86
  87/*
  88 *      X.25 Facilities constants.
  89 */
  90
  91#define X25_FAC_CLASS_MASK      0xC0
  92
  93#define X25_FAC_CLASS_A         0x00
  94#define X25_FAC_CLASS_B         0x40
  95#define X25_FAC_CLASS_C         0x80
  96#define X25_FAC_CLASS_D         0xC0
  97
  98#define X25_FAC_REVERSE         0x01                    /* also fast select */
  99#define X25_FAC_THROUGHPUT      0x02
 100#define X25_FAC_PACKET_SIZE     0x42
 101#define X25_FAC_WINDOW_SIZE     0x43
 102
 103#define X25_MAX_FAC_LEN         60
 104#define X25_MAX_CUD_LEN         128
 105
 106#define X25_FAC_CALLING_AE      0xCB
 107#define X25_FAC_CALLED_AE       0xC9
 108
 109#define X25_MARKER              0x00
 110#define X25_DTE_SERVICES        0x0F
 111#define X25_MAX_AE_LEN          40                      /* Max num of semi-octets in AE - OSI Nw */
 112#define X25_MAX_DTE_FACIL_LEN   21                      /* Max length of DTE facility params */
 113
 114/* Bitset in x25_sock->flags for misc flags */
 115#define X25_Q_BIT_FLAG          0
 116#define X25_INTERRUPT_FLAG      1
 117#define X25_ACCPT_APPRV_FLAG    2
 118
 119/**
 120 *      struct x25_route - x25 routing entry
 121 *      @node - entry in x25_list_lock
 122 *      @address - Start of address range
 123 *      @sigdigits - Number of sig digits
 124 *      @dev - More than one for MLP
 125 *      @refcnt - reference counter
 126 */
 127struct x25_route {
 128        struct list_head        node;           
 129        struct x25_address      address;
 130        unsigned int            sigdigits;
 131        struct net_device       *dev;
 132        atomic_t                refcnt;
 133};
 134
 135struct x25_neigh {
 136        struct list_head        node;
 137        struct net_device       *dev;
 138        unsigned int            state;
 139        unsigned int            extended;
 140        struct sk_buff_head     queue;
 141        unsigned long           t20;
 142        struct timer_list       t20timer;
 143        unsigned long           global_facil_mask;
 144        atomic_t                refcnt;
 145};
 146
 147struct x25_sock {
 148        struct sock             sk;
 149        struct x25_address      source_addr, dest_addr;
 150        struct x25_neigh        *neighbour;
 151        unsigned int            lci, cudmatchlength;
 152        unsigned char           state, condition;
 153        unsigned short          vs, vr, va, vl;
 154        unsigned long           t2, t21, t22, t23;
 155        unsigned short          fraglen;
 156        unsigned long           flags;
 157        struct sk_buff_head     ack_queue;
 158        struct sk_buff_head     fragment_queue;
 159        struct sk_buff_head     interrupt_in_queue;
 160        struct sk_buff_head     interrupt_out_queue;
 161        struct timer_list       timer;
 162        struct x25_causediag    causediag;
 163        struct x25_facilities   facilities;
 164        struct x25_dte_facilities dte_facilities;
 165        struct x25_calluserdata calluserdata;
 166        unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 167};
 168
 169struct x25_forward {
 170        struct list_head        node;
 171        unsigned int            lci;
 172        struct net_device       *dev1;
 173        struct net_device       *dev2;
 174        atomic_t                refcnt;
 175};
 176
 177static inline struct x25_sock *x25_sk(const struct sock *sk)
 178{
 179        return (struct x25_sock *)sk;
 180}
 181
 182/* af_x25.c */
 183extern int  sysctl_x25_restart_request_timeout;
 184extern int  sysctl_x25_call_request_timeout;
 185extern int  sysctl_x25_reset_request_timeout;
 186extern int  sysctl_x25_clear_request_timeout;
 187extern int  sysctl_x25_ack_holdback_timeout;
 188extern int  sysctl_x25_forward;
 189
 190extern int x25_parse_address_block(struct sk_buff *skb,
 191                struct x25_address *called_addr,
 192                struct x25_address *calling_addr);
 193
 194extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 195                          struct x25_address *);
 196extern int  x25_addr_aton(unsigned char *, struct x25_address *,
 197                          struct x25_address *);
 198extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 199extern void x25_destroy_socket_from_timer(struct sock *);
 200extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 201extern void x25_kill_by_neigh(struct x25_neigh *);
 202
 203/* x25_dev.c */
 204extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 205extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 206extern void x25_establish_link(struct x25_neigh *);
 207extern void x25_terminate_link(struct x25_neigh *);
 208
 209/* x25_facilities.c */
 210extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
 211                                struct x25_dte_facilities *, unsigned long *);
 212extern int x25_create_facilities(unsigned char *, struct x25_facilities *,
 213                                struct x25_dte_facilities *, unsigned long);
 214extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
 215                                struct x25_facilities *,
 216                                struct x25_dte_facilities *);
 217extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 218
 219/* x25_forward.c */
 220extern void x25_clear_forward_by_lci(unsigned int lci);
 221extern void x25_clear_forward_by_dev(struct net_device *);
 222extern int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
 223extern int x25_forward_call(struct x25_address *, struct x25_neigh *,
 224                                struct sk_buff *, int);
 225
 226/* x25_in.c */
 227extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
 228extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
 229
 230/* x25_link.c */
 231extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 232extern void x25_link_device_up(struct net_device *);
 233extern void x25_link_device_down(struct net_device *);
 234extern void x25_link_established(struct x25_neigh *);
 235extern void x25_link_terminated(struct x25_neigh *);
 236extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
 237extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 238extern int  x25_subscr_ioctl(unsigned int, void __user *);
 239extern struct x25_neigh *x25_get_neigh(struct net_device *);
 240extern void x25_link_free(void);
 241
 242/* x25_neigh.c */
 243static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 244{
 245        atomic_inc(&nb->refcnt);
 246}
 247
 248static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 249{
 250        if (atomic_dec_and_test(&nb->refcnt))
 251                kfree(nb);
 252}
 253
 254/* x25_out.c */
 255extern  int x25_output(struct sock *, struct sk_buff *);
 256extern void x25_kick(struct sock *);
 257extern void x25_enquiry_response(struct sock *);
 258
 259/* x25_route.c */
 260extern struct x25_route *x25_get_route(struct x25_address *addr);
 261extern struct net_device *x25_dev_get(char *);
 262extern void x25_route_device_down(struct net_device *dev);
 263extern int  x25_route_ioctl(unsigned int, void __user *);
 264extern void x25_route_free(void);
 265
 266static __inline__ void x25_route_hold(struct x25_route *rt)
 267{
 268        atomic_inc(&rt->refcnt);
 269}
 270
 271static __inline__ void x25_route_put(struct x25_route *rt)
 272{
 273        if (atomic_dec_and_test(&rt->refcnt))
 274                kfree(rt);
 275}
 276
 277/* x25_subr.c */
 278extern void x25_clear_queues(struct sock *);
 279extern void x25_frames_acked(struct sock *, unsigned short);
 280extern void x25_requeue_frames(struct sock *);
 281extern int  x25_validate_nr(struct sock *, unsigned short);
 282extern void x25_write_internal(struct sock *, int);
 283extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
 284extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 285
 286/* x25_timer.c */
 287extern void x25_init_timers(struct sock *sk);
 288extern void x25_start_heartbeat(struct sock *);
 289extern void x25_start_t2timer(struct sock *);
 290extern void x25_start_t21timer(struct sock *);
 291extern void x25_start_t22timer(struct sock *);
 292extern void x25_start_t23timer(struct sock *);
 293extern void x25_stop_heartbeat(struct sock *);
 294extern void x25_stop_timer(struct sock *);
 295extern unsigned long x25_display_timer(struct sock *);
 296extern void x25_check_rbuf(struct sock *);
 297
 298/* sysctl_net_x25.c */
 299#ifdef CONFIG_SYSCTL
 300extern void x25_register_sysctl(void);
 301extern void x25_unregister_sysctl(void);
 302#else
 303static inline void x25_register_sysctl(void) {};
 304static inline void x25_unregister_sysctl(void) {};
 305#endif /* CONFIG_SYSCTL */
 306
 307struct x25_skb_cb {
 308        unsigned int flags;
 309};
 310#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
 311
 312extern struct hlist_head x25_list;
 313extern rwlock_t x25_list_lock;
 314extern struct list_head x25_route_list;
 315extern rwlock_t x25_route_list_lock;
 316extern struct list_head x25_forward_list;
 317extern rwlock_t x25_forward_list_lock;
 318extern struct list_head x25_neigh_list;
 319extern rwlock_t x25_neigh_list_lock;
 320
 321extern int x25_proc_init(void);
 322extern void x25_proc_exit(void);
 323#endif
 324
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