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
  14 #define X25_ADDR_LEN                    16
  15
  16 #define X25_MAX_L2_LEN                  18      /* 802.2 LLC */
  17
  18 #define X25_STD_MIN_LEN                 3
  19 #define X25_EXT_MIN_LEN                 4
  20
  21 #define X25_GFI_SEQ_MASK                0x30
  22 #define X25_GFI_STDSEQ                  0x10
  23 #define X25_GFI_EXTSEQ                  0x20
  24
  25 #define X25_Q_BIT                       0x80
  26 #define X25_D_BIT                       0x40
  27 #define X25_STD_M_BIT                   0x10
  28 #define X25_EXT_M_BIT                   0x01
  29
  30 #define X25_CALL_REQUEST                0x0B
  31 #define X25_CALL_ACCEPTED               0x0F
  32 #define X25_CLEAR_REQUEST               0x13
  33 #define X25_CLEAR_CONFIRMATION          0x17
  34 #define X25_DATA                        0x00
  35 #define X25_INTERRUPT                   0x23
  36 #define X25_INTERRUPT_CONFIRMATION      0x27
  37 #define X25_RR                          0x01
  38 #define X25_RNR                         0x05
  39 #define X25_REJ                         0x09
  40 #define X25_RESET_REQUEST               0x1B
  41 #define X25_RESET_CONFIRMATION          0x1F
  42 #define X25_REGISTRATION_REQUEST        0xF3
  43 #define X25_REGISTRATION_CONFIRMATION   0xF7
  44 #define X25_RESTART_REQUEST             0xFB
  45 #define X25_RESTART_CONFIRMATION        0xFF
  46 #define X25_DIAGNOSTIC                  0xF1
  47 #define X25_ILLEGAL                     0xFD
  48
  49 /* Define the various conditions that may exist */
  50
  51 #define X25_COND_ACK_PENDING    0x01
  52 #define X25_COND_OWN_RX_BUSY    0x02
  53 #define X25_COND_PEER_RX_BUSY   0x04
  54
  55 /* Define Link State constants. */
  56 enum {
  57         X25_STATE_0,            /* Ready */
  58         X25_STATE_1,            /* Awaiting Call Accepted */
  59         X25_STATE_2,            /* Awaiting Clear Confirmation */
  60         X25_STATE_3,            /* Data Transfer */
  61         X25_STATE_4             /* Awaiting Reset Confirmation */
  62 };
  63
  64 enum {
  65         X25_LINK_STATE_0,
  66         X25_LINK_STATE_1,
  67         X25_LINK_STATE_2,
  68         X25_LINK_STATE_3
  69 };
  70
  71 #define X25_DEFAULT_T20         (180 * HZ)              /* Default T20 value */
  72 #define X25_DEFAULT_T21         (200 * HZ)              /* Default T21 value */
  73 #define X25_DEFAULT_T22         (180 * HZ)              /* Default T22 value */
  74 #define X25_DEFAULT_T23         (180 * HZ)              /* Default T23 value */
  75 #define X25_DEFAULT_T2          (3   * HZ)              /* Default ack holdback value */
  76
  77 #define X25_DEFAULT_WINDOW_SIZE 2                       /* Default Window Size  */
  78 #define X25_DEFAULT_PACKET_SIZE X25_PS128               /* Default Packet Size */
  79 #define X25_DEFAULT_THROUGHPUT  0x0A                    /* Deafult Throughput */
  80 #define X25_DEFAULT_REVERSE     0x00                    /* Default Reverse Charging */
  81
  82 #define X25_SMODULUS            8
  83 #define X25_EMODULUS            128
  84
  85 /*
  86  *      X.25 Facilities constants.
  87  */
  88
  89 #define X25_FAC_CLASS_MASK      0xC0
  90
  91 #define X25_FAC_CLASS_A         0x00
  92 #define X25_FAC_CLASS_B         0x40
  93 #define X25_FAC_CLASS_C         0x80
  94 #define X25_FAC_CLASS_D         0xC0
  95
  96 #define X25_FAC_REVERSE         0x01
  97 #define X25_FAC_THROUGHPUT      0x02
  98 #define X25_FAC_PACKET_SIZE     0x42
  99 #define X25_FAC_WINDOW_SIZE     0x43
 100
 101 #define X25_MAX_FAC_LEN         20              /* Plenty to spare */
 102 #define X25_MAX_CUD_LEN         128
 103
 104 /**
 105  *      struct x25_route - x25 routing entry
 106  *      @node - entry in x25_list_lock
 107  *      @address - Start of address range
 108  *      @sigdigits - Number of sig digits
 109  *      @dev - More than one for MLP
 110  *      @refcnt - reference counter
 111  */
 112 struct x25_route {
 113         struct list_head        node;
 114         struct x25_address      address;
 115         unsigned int            sigdigits;
 116         struct net_device       *dev;
 117         atomic_t                refcnt;
 118 };
 119
 120 struct x25_neigh {
 121         struct list_head        node;
 122         struct net_device       *dev;
 123         unsigned int            state;
 124         unsigned int            extended;
 125         struct sk_buff_head     queue;
 126         unsigned long           t20;
 127         struct timer_list       t20timer;
 128         unsigned long           global_facil_mask;
 129         atomic_t                refcnt;
 130 };
 131
 132 struct x25_opt {
 133         struct x25_address      source_addr, dest_addr;
 134         struct x25_neigh        *neighbour;
 135         unsigned int            lci;
 136         unsigned char           state, condition, qbitincl, intflag;
 137         unsigned short          vs, vr, va, vl;
 138         unsigned long           t2, t21, t22, t23;
 139         unsigned short          fraglen;
 140         struct sk_buff_head     ack_queue;
 141         struct sk_buff_head     fragment_queue;
 142         struct sk_buff_head     interrupt_in_queue;
 143         struct sk_buff_head     interrupt_out_queue;
 144         struct sock             *sk;            /* Backlink to socket */
 145         struct timer_list       timer;
 146         struct x25_causediag    causediag;
 147         struct x25_facilities   facilities;
 148         struct x25_calluserdata calluserdata;
 149         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 150 };
 151
 152 #define x25_sk(__sk) ((struct x25_opt *)(__sk)->sk_protinfo)
 153
 154 /* af_x25.c */
 155 extern int  sysctl_x25_restart_request_timeout;
 156 extern int  sysctl_x25_call_request_timeout;
 157 extern int  sysctl_x25_reset_request_timeout;
 158 extern int  sysctl_x25_clear_request_timeout;
 159 extern int  sysctl_x25_ack_holdback_timeout;
 160
 161 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 162                           struct x25_address *);
 163 extern int  x25_addr_aton(unsigned char *, struct x25_address *,
 164                           struct x25_address *);
 165 extern unsigned int x25_new_lci(struct x25_neigh *);
 166 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 167 extern void x25_destroy_socket(struct sock *);
 168 extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 169 extern void x25_kill_by_neigh(struct x25_neigh *);
 170
 171 /* x25_dev.c */
 172 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 173 extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *);
 174 extern int  x25_llc_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *);
 175 extern void x25_establish_link(struct x25_neigh *);
 176 extern void x25_terminate_link(struct x25_neigh *);
 177
 178 /* x25_facilities.c */
 179 extern int  x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
 180 extern int  x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
 181 extern int  x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
 182 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 183
 184 /* x25_in.c */
 185 extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
 186 extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
 187
 188 /* x25_link.c */
 189 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 190 extern void x25_link_device_up(struct net_device *);
 191 extern void x25_link_device_down(struct net_device *);
 192 extern void x25_link_established(struct x25_neigh *);
 193 extern void x25_link_terminated(struct x25_neigh *);
 194 extern void x25_transmit_restart_request(struct x25_neigh *);
 195 extern void x25_transmit_restart_confirmation(struct x25_neigh *);
 196 extern void x25_transmit_diagnostic(struct x25_neigh *, unsigned char);
 197 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
 198 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 199 extern int  x25_subscr_ioctl(unsigned int, void __user *);
 200 extern struct x25_neigh *x25_get_neigh(struct net_device *);
 201 extern void x25_link_free(void);
 202
 203 /* x25_neigh.c */
 204 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 205 {
 206         atomic_inc(&nb->refcnt);
 207 }
 208
 209 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 210 {
 211         if (atomic_dec_and_test(&nb->refcnt))
 212                 kfree(nb);
 213 }
 214
 215 /* x25_out.c */
 216 extern  int x25_output(struct sock *, struct sk_buff *);
 217 extern void x25_kick(struct sock *);
 218 extern void x25_enquiry_response(struct sock *);
 219
 220 /* x25_route.c */
 221 extern struct x25_route *x25_get_route(struct x25_address *addr);
 222 extern struct net_device *x25_dev_get(char *);
 223 extern void x25_route_device_down(struct net_device *dev);
 224 extern int  x25_route_ioctl(unsigned int, void __user *);
 225 extern void x25_route_free(void);
 226
 227 static __inline__ void x25_route_hold(struct x25_route *rt)
 228 {
 229         atomic_inc(&rt->refcnt);
 230 }
 231
 232 static __inline__ void x25_route_put(struct x25_route *rt)
 233 {
 234         if (atomic_dec_and_test(&rt->refcnt))
 235                 kfree(rt);
 236 }
 237
 238 /* x25_subr.c */
 239 extern void x25_clear_queues(struct sock *);
 240 extern void x25_frames_acked(struct sock *, unsigned short);
 241 extern void x25_requeue_frames(struct sock *);
 242 extern int  x25_validate_nr(struct sock *, unsigned short);
 243 extern void x25_write_internal(struct sock *, int);
 244 extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
 245 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 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