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