include/net/x25.h

   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 <net/sock.h>
  14
  15 #define X25_ADDR_LEN                    16
  16
  17 #define X25_MAX_L2_LEN                  18      /* 802.2 LLC */
  18
  19 #define X25_STD_MIN_LEN                 3
  20 #define X25_EXT_MIN_LEN                 4
  21
  22 #define X25_GFI_SEQ_MASK                0x30
  23 #define X25_GFI_STDSEQ                  0x10
  24 #define X25_GFI_EXTSEQ                  0x20
  25
  26 #define X25_Q_BIT                       0x80
  27 #define X25_D_BIT                       0x40
  28 #define X25_STD_M_BIT                   0x10
  29 #define X25_EXT_M_BIT                   0x01
  30
  31 #define X25_CALL_REQUEST                0x0B
  32 #define X25_CALL_ACCEPTED               0x0F
  33 #define X25_CLEAR_REQUEST               0x13
  34 #define X25_CLEAR_CONFIRMATION          0x17
  35 #define X25_DATA                        0x00
  36 #define X25_INTERRUPT                   0x23
  37 #define X25_INTERRUPT_CONFIRMATION      0x27
  38 #define X25_RR                          0x01
  39 #define X25_RNR                         0x05
  40 #define X25_REJ                         0x09
  41 #define X25_RESET_REQUEST               0x1B
  42 #define X25_RESET_CONFIRMATION          0x1F
  43 #define X25_REGISTRATION_REQUEST        0xF3
  44 #define X25_REGISTRATION_CONFIRMATION   0xF7
  45 #define X25_RESTART_REQUEST             0xFB
  46 #define X25_RESTART_CONFIRMATION        0xFF
  47 #define X25_DIAGNOSTIC                  0xF1
  48 #define X25_ILLEGAL                     0xFD
  49
  50 /* Define the various conditions that may exist */
  51
  52 #define X25_COND_ACK_PENDING    0x01
  53 #define X25_COND_OWN_RX_BUSY    0x02
  54 #define X25_COND_PEER_RX_BUSY   0x04
  55
  56 /* Define Link State constants. */
  57 enum {
  58         X25_STATE_0,            /* Ready */
  59         X25_STATE_1,            /* Awaiting Call Accepted */
  60         X25_STATE_2,            /* Awaiting Clear Confirmation */
  61         X25_STATE_3,            /* Data Transfer */
  62         X25_STATE_4             /* Awaiting Reset Confirmation */
  63 };
  64
  65 enum {
  66         X25_LINK_STATE_0,
  67         X25_LINK_STATE_1,
  68         X25_LINK_STATE_2,
  69         X25_LINK_STATE_3
  70 };
  71
  72 #define X25_DEFAULT_T20         (180 * HZ)              /* Default T20 value */
  73 #define X25_DEFAULT_T21         (200 * HZ)              /* Default T21 value */
  74 #define X25_DEFAULT_T22         (180 * HZ)              /* Default T22 value */
  75 #define X25_DEFAULT_T23         (180 * HZ)              /* Default T23 value */
  76 #define X25_DEFAULT_T2          (3   * HZ)              /* Default ack holdback value */
  77
  78 #define X25_DEFAULT_WINDOW_SIZE 2                       /* Default Window Size  */
  79 #define X25_DEFAULT_PACKET_SIZE X25_PS128               /* Default Packet Size */
  80 #define X25_DEFAULT_THROUGHPUT  0x0A                    /* Deafult Throughput */
  81 #define X25_DEFAULT_REVERSE     0x00                    /* Default Reverse Charging */
  82
  83 #define X25_SMODULUS            8
  84 #define X25_EMODULUS            128
  85
  86 /*
  87  *      X.25 Facilities constants.
  88  */
  89
  90 #define X25_FAC_CLASS_MASK      0xC0
  91
  92 #define X25_FAC_CLASS_A         0x00
  93 #define X25_FAC_CLASS_B         0x40
  94 #define X25_FAC_CLASS_C         0x80
  95 #define X25_FAC_CLASS_D         0xC0
  96
  97 #define X25_FAC_REVERSE         0x01
  98 #define X25_FAC_THROUGHPUT      0x02
  99 #define X25_FAC_PACKET_SIZE     0x42
 100 #define X25_FAC_WINDOW_SIZE     0x43
 101
 102 #define X25_MAX_FAC_LEN         20              /* Plenty to spare */
 103 #define X25_MAX_CUD_LEN         128
 104
 105 /**
 106  *      struct x25_route - x25 routing entry
 107  *      @node - entry in x25_list_lock
 108  *      @address - Start of address range
 109  *      @sigdigits - Number of sig digits
 110  *      @dev - More than one for MLP
 111  *      @refcnt - reference counter
 112  */
 113 struct x25_route {
 114         struct list_head        node;
 115         struct x25_address      address;
 116         unsigned int            sigdigits;
 117         struct net_device       *dev;
 118         atomic_t                refcnt;
 119 };
 120
 121 struct x25_neigh {
 122         struct list_head        node;
 123         struct net_device       *dev;
 124         unsigned int            state;
 125         unsigned int            extended;
 126         struct sk_buff_head     queue;
 127         unsigned long           t20;
 128         struct timer_list       t20timer;
 129         unsigned long           global_facil_mask;
 130         atomic_t                refcnt;
 131 };
 132
 133 struct x25_sock {
 134         struct sock             sk;
 135         struct x25_address      source_addr, dest_addr;
 136         struct x25_neigh        *neighbour;
 137         unsigned int            lci;
 138         unsigned char           state, condition, qbitincl, intflag;
 139         unsigned short          vs, vr, va, vl;
 140         unsigned long           t2, t21, t22, t23;
 141         unsigned short          fraglen;
 142         struct sk_buff_head     ack_queue;
 143         struct sk_buff_head     fragment_queue;
 144         struct sk_buff_head     interrupt_in_queue;
 145         struct sk_buff_head     interrupt_out_queue;
 146         struct timer_list       timer;
 147         struct x25_causediag    causediag;
 148         struct x25_facilities   facilities;
 149         struct x25_calluserdata calluserdata;
 150         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 151 };
 152
 153 static inline struct x25_sock *x25_sk(const struct sock *sk)
 154 {
 155         return (struct x25_sock *)sk;
 156 }
 157
 158 /* af_x25.c */
 159 extern int  sysctl_x25_restart_request_timeout;
 160 extern int  sysctl_x25_call_request_timeout;
 161 extern int  sysctl_x25_reset_request_timeout;
 162 extern int  sysctl_x25_clear_request_timeout;
 163 extern int  sysctl_x25_ack_holdback_timeout;
 164
 165 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 166                           struct x25_address *);
 167 extern int  x25_addr_aton(unsigned char *, struct x25_address *,
 168                           struct x25_address *);
 169 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 170 extern void x25_destroy_socket(struct sock *);
 171 extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 172 extern void x25_kill_by_neigh(struct x25_neigh *);
 173
 174 /* x25_dev.c */
 175 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 176 extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *);
 177 extern void x25_establish_link(struct x25_neigh *);
 178 extern void x25_terminate_link(struct x25_neigh *);
 179
 180 /* x25_facilities.c */
 181 extern int  x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
 182 extern int  x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
 183 extern int  x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
 184 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 185
 186 /* x25_in.c */
 187 extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
 188 extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
 189
 190 /* x25_link.c */
 191 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 192 extern void x25_link_device_up(struct net_device *);
 193 extern void x25_link_device_down(struct net_device *);
 194 extern void x25_link_established(struct x25_neigh *);
 195 extern void x25_link_terminated(struct x25_neigh *);
 196 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
 197 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 198 extern int  x25_subscr_ioctl(unsigned int, void __user *);
 199 extern struct x25_neigh *x25_get_neigh(struct net_device *);
 200 extern void x25_link_free(void);
 201
 202 /* x25_neigh.c */
 203 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 204 {
 205         atomic_inc(&nb->refcnt);
 206 }
 207
 208 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 209 {
 210         if (atomic_dec_and_test(&nb->refcnt))
 211                 kfree(nb);
 212 }
 213
 214 /* x25_out.c */
 215 extern  int x25_output(struct sock *, struct sk_buff *);
 216 extern void x25_kick(struct sock *);
 217 extern void x25_enquiry_response(struct sock *);
 218
 219 /* x25_route.c */
 220 extern struct x25_route *x25_get_route(struct x25_address *addr);
 221 extern struct net_device *x25_dev_get(char *);
 222 extern void x25_route_device_down(struct net_device *dev);
 223 extern int  x25_route_ioctl(unsigned int, void __user *);
 224 extern void x25_route_free(void);
 225
 226 static __inline__ void x25_route_hold(struct x25_route *rt)
 227 {
 228         atomic_inc(&rt->refcnt);
 229 }
 230
 231 static __inline__ void x25_route_put(struct x25_route *rt)
 232 {
 233         if (atomic_dec_and_test(&rt->refcnt))
 234                 kfree(rt);
 235 }
 236
 237 /* x25_subr.c */
 238 extern void x25_clear_queues(struct sock *);
 239 extern void x25_frames_acked(struct sock *, unsigned short);
 240 extern void x25_requeue_frames(struct sock *);
 241 extern int  x25_validate_nr(struct sock *, unsigned short);
 242 extern void x25_write_internal(struct sock *, int);
 243 extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
 244 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 245 extern int x25_check_calluserdata(struct x25_calluserdata *,struct x25_calluserdata *);
 246
 247 /* x25_timer.c */
 248 extern void x25_start_heartbeat(struct sock *);
 249 extern void x25_start_t2timer(struct sock *);
 250 extern void x25_start_t21timer(struct sock *);
 251 extern void x25_start_t22timer(struct sock *);
 252 extern void x25_start_t23timer(struct sock *);
 253 extern void x25_stop_heartbeat(struct sock *);
 254 extern void x25_stop_timer(struct sock *);
 255 extern unsigned long x25_display_timer(struct sock *);
 256 extern void x25_check_rbuf(struct sock *);
 257
 258 /* sysctl_net_x25.c */
 259 extern void x25_register_sysctl(void);
 260 extern void x25_unregister_sysctl(void);
 261 struct x25_skb_cb {
 262         unsigned flags;
 263 };
 264 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
 265
 266 extern struct hlist_head x25_list;
 267 extern rwlock_t x25_list_lock;
 268 extern struct list_head x25_route_list;
 269 extern rwlock_t x25_route_list_lock;
 270
 271 extern int x25_proc_init(void);
 272 extern void x25_proc_exit(void);
 273 #endif