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 <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. */
  58 enum {
  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
  66 enum {
  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 #define X25_DENY_ACCPT_APPRV   0x01                     /* Default value */
  84 #define X25_ALLOW_ACCPT_APPRV  0x00                     /* Control enabled */
  85
  86 #define X25_SMODULUS            8
  87 #define X25_EMODULUS            128
  88
  89 /*
  90  *      X.25 Facilities constants.
  91  */
  92
  93 #define X25_FAC_CLASS_MASK      0xC0
  94
  95 #define X25_FAC_CLASS_A         0x00
  96 #define X25_FAC_CLASS_B         0x40
  97 #define X25_FAC_CLASS_C         0x80
  98 #define X25_FAC_CLASS_D         0xC0
  99
 100 #define X25_FAC_REVERSE         0x01                    /* also fast select */
 101 #define X25_FAC_THROUGHPUT      0x02
 102 #define X25_FAC_PACKET_SIZE     0x42
 103 #define X25_FAC_WINDOW_SIZE     0x43
 104
 105 #define X25_MAX_FAC_LEN         60
 106 #define X25_MAX_CUD_LEN         128
 107
 108 #define X25_FAC_CALLING_AE      0xCB
 109 #define X25_FAC_CALLED_AE       0xC9
 110
 111 #define X25_MARKER              0x00
 112 #define X25_DTE_SERVICES        0x0F
 113 #define X25_MAX_AE_LEN          40                      /* Max num of semi-octets in AE - OSI Nw */
 114 #define X25_MAX_DTE_FACIL_LEN   21                      /* Max length of DTE facility params */
 115
 116 /**
 117  *      struct x25_route - x25 routing entry
 118  *      @node - entry in x25_list_lock
 119  *      @address - Start of address range
 120  *      @sigdigits - Number of sig digits
 121  *      @dev - More than one for MLP
 122  *      @refcnt - reference counter
 123  */
 124 struct x25_route {
 125         struct list_head        node;
 126         struct x25_address      address;
 127         unsigned int            sigdigits;
 128         struct net_device       *dev;
 129         atomic_t                refcnt;
 130 };
 131
 132 struct x25_neigh {
 133         struct list_head        node;
 134         struct net_device       *dev;
 135         unsigned int            state;
 136         unsigned int            extended;
 137         struct sk_buff_head     queue;
 138         unsigned long           t20;
 139         struct timer_list       t20timer;
 140         unsigned long           global_facil_mask;
 141         atomic_t                refcnt;
 142 };
 143
 144 struct x25_sock {
 145         struct sock             sk;
 146         struct x25_address      source_addr, dest_addr;
 147         struct x25_neigh        *neighbour;
 148         unsigned int            lci, cudmatchlength;
 149         unsigned char           state, condition, qbitincl, intflag, accptapprv;
 150         unsigned short          vs, vr, va, vl;
 151         unsigned long           t2, t21, t22, t23;
 152         unsigned short          fraglen;
 153         struct sk_buff_head     ack_queue;
 154         struct sk_buff_head     fragment_queue;
 155         struct sk_buff_head     interrupt_in_queue;
 156         struct sk_buff_head     interrupt_out_queue;
 157         struct timer_list       timer;
 158         struct x25_causediag    causediag;
 159         struct x25_facilities   facilities;
 160         struct x25_dte_facilities dte_facilities;
 161         struct x25_calluserdata calluserdata;
 162         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 163 };
 164
 165 struct x25_forward {
 166         struct list_head        node;
 167         unsigned int            lci;
 168         struct net_device       *dev1;
 169         struct net_device       *dev2;
 170         atomic_t                refcnt;
 171 };
 172
 173 static inline struct x25_sock *x25_sk(const struct sock *sk)
 174 {
 175         return (struct x25_sock *)sk;
 176 }
 177
 178 /* af_x25.c */
 179 extern int  sysctl_x25_restart_request_timeout;
 180 extern int  sysctl_x25_call_request_timeout;
 181 extern int  sysctl_x25_reset_request_timeout;
 182 extern int  sysctl_x25_clear_request_timeout;
 183 extern int  sysctl_x25_ack_holdback_timeout;
 184 extern int  sysctl_x25_forward;
 185
 186 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
 187                           struct x25_address *);
 188 extern int  x25_addr_aton(unsigned char *, struct x25_address *,
 189                           struct x25_address *);
 190 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 191 extern void x25_destroy_socket_from_timer(struct sock *);
 192 extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 193 extern void x25_kill_by_neigh(struct x25_neigh *);
 194
 195 /* x25_dev.c */
 196 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 197 extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 198 extern void x25_establish_link(struct x25_neigh *);
 199 extern void x25_terminate_link(struct x25_neigh *);
 200
 201 /* x25_facilities.c */
 202 extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
 203                                 struct x25_dte_facilities *, unsigned long *);
 204 extern int x25_create_facilities(unsigned char *, struct x25_facilities *,
 205                                 struct x25_dte_facilities *, unsigned long);
 206 extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
 207                                 struct x25_facilities *,
 208                                 struct x25_dte_facilities *);
 209 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 210
 211 /* x25_forward.c */
 212 extern void x25_clear_forward_by_lci(unsigned int lci);
 213 extern void x25_clear_forward_by_dev(struct net_device *);
 214 extern int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
 215 extern int x25_forward_call(struct x25_address *, struct x25_neigh *,
 216                                 struct sk_buff *, int);
 217
 218 /* x25_in.c */
 219 extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
 220 extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
 221
 222 /* x25_link.c */
 223 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 224 extern void x25_link_device_up(struct net_device *);
 225 extern void x25_link_device_down(struct net_device *);
 226 extern void x25_link_established(struct x25_neigh *);
 227 extern void x25_link_terminated(struct x25_neigh *);
 228 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
 229 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 230 extern int  x25_subscr_ioctl(unsigned int, void __user *);
 231 extern struct x25_neigh *x25_get_neigh(struct net_device *);
 232 extern void x25_link_free(void);
 233
 234 /* x25_neigh.c */
 235 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 236 {
 237         atomic_inc(&nb->refcnt);
 238 }
 239
 240 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 241 {
 242         if (atomic_dec_and_test(&nb->refcnt))
 243                 kfree(nb);
 244 }
 245
 246 /* x25_out.c */
 247 extern  int x25_output(struct sock *, struct sk_buff *);
 248 extern void x25_kick(struct sock *);
 249 extern void x25_enquiry_response(struct sock *);
 250
 251 /* x25_route.c */
 252 extern struct x25_route *x25_get_route(struct x25_address *addr);
 253 extern struct net_device *x25_dev_get(char *);
 254 extern void x25_route_device_down(struct net_device *dev);
 255 extern int  x25_route_ioctl(unsigned int, void __user *);
 256 extern void x25_route_free(void);
 257
 258 static __inline__ void x25_route_hold(struct x25_route *rt)
 259 {
 260         atomic_inc(&rt->refcnt);
 261 }
 262
 263 static __inline__ void x25_route_put(struct x25_route *rt)
 264 {
 265         if (atomic_dec_and_test(&rt->refcnt))
 266                 kfree(rt);
 267 }
 268
 269 /* x25_subr.c */
 270 extern void x25_clear_queues(struct sock *);
 271 extern void x25_frames_acked(struct sock *, unsigned short);
 272 extern void x25_requeue_frames(struct sock *);
 273 extern int  x25_validate_nr(struct sock *, unsigned short);
 274 extern void x25_write_internal(struct sock *, int);
 275 extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
 276 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 277
 278 /* x25_timer.c */
 279 extern void x25_init_timers(struct sock *sk);
 280 extern void x25_start_heartbeat(struct sock *);
 281 extern void x25_start_t2timer(struct sock *);
 282 extern void x25_start_t21timer(struct sock *);
 283 extern void x25_start_t22timer(struct sock *);
 284 extern void x25_start_t23timer(struct sock *);
 285 extern void x25_stop_heartbeat(struct sock *);
 286 extern void x25_stop_timer(struct sock *);
 287 extern unsigned long x25_display_timer(struct sock *);
 288 extern void x25_check_rbuf(struct sock *);
 289
 290 /* sysctl_net_x25.c */
 291 #ifdef CONFIG_SYSCTL
 292 extern void x25_register_sysctl(void);
 293 extern void x25_unregister_sysctl(void);
 294 #else
 295 static inline void x25_register_sysctl(void) {};
 296 static inline void x25_unregister_sysctl(void) {};
 297 #endif /* CONFIG_SYSCTL */
 298
 299 struct x25_skb_cb {
 300         unsigned flags;
 301 };
 302 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
 303
 304 extern struct hlist_head x25_list;
 305 extern rwlock_t x25_list_lock;
 306 extern struct list_head x25_route_list;
 307 extern rwlock_t x25_route_list_lock;
 308 extern struct list_head x25_forward_list;
 309 extern rwlock_t x25_forward_list_lock;
 310
 311 extern int x25_proc_init(void);
 312 extern void x25_proc_exit(void);
 313 #endif