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 #define X25_DENY_ACCPT_APPRV   0x01                     /* Default value */
  83 #define X25_ALLOW_ACCPT_APPRV  0x00                     /* Control enabled */
  84
  85 #define X25_SMODULUS            8
  86 #define X25_EMODULUS            128
  87
  88 /*
  89  *      X.25 Facilities constants.
  90  */
  91
  92 #define X25_FAC_CLASS_MASK      0xC0
  93
  94 #define X25_FAC_CLASS_A         0x00
  95 #define X25_FAC_CLASS_B         0x40
  96 #define X25_FAC_CLASS_C         0x80
  97 #define X25_FAC_CLASS_D         0xC0
  98
  99 #define X25_FAC_REVERSE         0x01                    /* also fast select */
 100 #define X25_FAC_THROUGHPUT      0x02
 101 #define X25_FAC_PACKET_SIZE     0x42
 102 #define X25_FAC_WINDOW_SIZE     0x43
 103
 104 #define X25_MAX_FAC_LEN         20              /* Plenty to spare */
 105 #define X25_MAX_CUD_LEN         128
 106
 107 /**
 108  *      struct x25_route - x25 routing entry
 109  *      @node - entry in x25_list_lock
 110  *      @address - Start of address range
 111  *      @sigdigits - Number of sig digits
 112  *      @dev - More than one for MLP
 113  *      @refcnt - reference counter
 114  */
 115 struct x25_route {
 116         struct list_head        node;
 117         struct x25_address      address;
 118         unsigned int            sigdigits;
 119         struct net_device       *dev;
 120         atomic_t                refcnt;
 121 };
 122
 123 struct x25_neigh {
 124         struct list_head        node;
 125         struct net_device       *dev;
 126         unsigned int            state;
 127         unsigned int            extended;
 128         struct sk_buff_head     queue;
 129         unsigned long           t20;
 130         struct timer_list       t20timer;
 131         unsigned long           global_facil_mask;
 132         atomic_t                refcnt;
 133 };
 134
 135 struct x25_sock {
 136         struct sock             sk;
 137         struct x25_address      source_addr, dest_addr;
 138         struct x25_neigh        *neighbour;
 139         unsigned int            lci, cudmatchlength;
 140         unsigned char           state, condition, qbitincl, intflag, accptapprv;
 141         unsigned short          vs, vr, va, vl;
 142         unsigned long           t2, t21, t22, t23;
 143         unsigned short          fraglen;
 144         struct sk_buff_head     ack_queue;
 145         struct sk_buff_head     fragment_queue;
 146         struct sk_buff_head     interrupt_in_queue;
 147         struct sk_buff_head     interrupt_out_queue;
 148         struct timer_list       timer;
 149         struct x25_causediag    causediag;
 150         struct x25_facilities   facilities;
 151         struct x25_calluserdata calluserdata;
 152         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 153 };
 154
 155 static inline struct x25_sock *x25_sk(const struct sock *sk)
 156 {
 157         return (struct x25_sock *)sk;
 158 }
 159
 160 /* af_x25.c */
 161 extern int  sysctl_x25_restart_request_timeout;
 162 extern int  sysctl_x25_call_request_timeout;
 163 extern int  sysctl_x25_reset_request_timeout;
 164 extern int  sysctl_x25_clear_request_timeout;
 165 extern int  sysctl_x25_ack_holdback_timeout;
 166
 167 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 168                           struct x25_address *);
 169 extern int  x25_addr_aton(unsigned char *, struct x25_address *,
 170                           struct x25_address *);
 171 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 172 extern void x25_destroy_socket(struct sock *);
 173 extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 174 extern void x25_kill_by_neigh(struct x25_neigh *);
 175
 176 /* x25_dev.c */
 177 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 178 extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 179 extern void x25_establish_link(struct x25_neigh *);
 180 extern void x25_terminate_link(struct x25_neigh *);
 181
 182 /* x25_facilities.c */
 183 extern int  x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
 184 extern int  x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
 185 extern int  x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
 186 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 187
 188 /* x25_in.c */
 189 extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
 190 extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
 191
 192 /* x25_link.c */
 193 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 194 extern void x25_link_device_up(struct net_device *);
 195 extern void x25_link_device_down(struct net_device *);
 196 extern void x25_link_established(struct x25_neigh *);
 197 extern void x25_link_terminated(struct x25_neigh *);
 198 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
 199 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 200 extern int  x25_subscr_ioctl(unsigned int, void __user *);
 201 extern struct x25_neigh *x25_get_neigh(struct net_device *);
 202 extern void x25_link_free(void);
 203
 204 /* x25_neigh.c */
 205 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 206 {
 207         atomic_inc(&nb->refcnt);
 208 }
 209
 210 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 211 {
 212         if (atomic_dec_and_test(&nb->refcnt))
 213                 kfree(nb);
 214 }
 215
 216 /* x25_out.c */
 217 extern  int x25_output(struct sock *, struct sk_buff *);
 218 extern void x25_kick(struct sock *);
 219 extern void x25_enquiry_response(struct sock *);
 220
 221 /* x25_route.c */
 222 extern struct x25_route *x25_get_route(struct x25_address *addr);
 223 extern struct net_device *x25_dev_get(char *);
 224 extern void x25_route_device_down(struct net_device *dev);
 225 extern int  x25_route_ioctl(unsigned int, void __user *);
 226 extern void x25_route_free(void);
 227
 228 static __inline__ void x25_route_hold(struct x25_route *rt)
 229 {
 230         atomic_inc(&rt->refcnt);
 231 }
 232
 233 static __inline__ void x25_route_put(struct x25_route *rt)
 234 {
 235         if (atomic_dec_and_test(&rt->refcnt))
 236                 kfree(rt);
 237 }
 238
 239 /* x25_subr.c */
 240 extern void x25_clear_queues(struct sock *);
 241 extern void x25_frames_acked(struct sock *, unsigned short);
 242 extern void x25_requeue_frames(struct sock *);
 243 extern int  x25_validate_nr(struct sock *, unsigned short);
 244 extern void x25_write_internal(struct sock *, int);
 245 extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
 246 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 247
 248 /* x25_timer.c */
 249 extern void x25_start_heartbeat(struct sock *);
 250 extern void x25_start_t2timer(struct sock *);
 251 extern void x25_start_t21timer(struct sock *);
 252 extern void x25_start_t22timer(struct sock *);
 253 extern void x25_start_t23timer(struct sock *);
 254 extern void x25_stop_heartbeat(struct sock *);
 255 extern void x25_stop_timer(struct sock *);
 256 extern unsigned long x25_display_timer(struct sock *);
 257 extern void x25_check_rbuf(struct sock *);
 258
 259 /* sysctl_net_x25.c */
 260 extern void x25_register_sysctl(void);
 261 extern void x25_unregister_sysctl(void);
 262 struct x25_skb_cb {
 263         unsigned flags;
 264 };
 265 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
 266
 267 extern struct hlist_head x25_list;
 268 extern rwlock_t x25_list_lock;
 269 extern struct list_head x25_route_list;
 270 extern rwlock_t x25_route_list_lock;
 271
 272 extern int x25_proc_init(void);
 273 extern void x25_proc_exit(void);
 274 #endif