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
  84 #define X25_SMODULUS            8
  85 #define X25_EMODULUS            128
  86
  87 /*
  88  *      X.25 Facilities constants.
  89  */
  90
  91 #define X25_FAC_CLASS_MASK      0xC0
  92
  93 #define X25_FAC_CLASS_A         0x00
  94 #define X25_FAC_CLASS_B         0x40
  95 #define X25_FAC_CLASS_C         0x80
  96 #define X25_FAC_CLASS_D         0xC0
  97
  98 #define X25_FAC_REVERSE         0x01                    /* also fast select */
  99 #define X25_FAC_THROUGHPUT      0x02
 100 #define X25_FAC_PACKET_SIZE     0x42
 101 #define X25_FAC_WINDOW_SIZE     0x43
 102
 103 #define X25_MAX_FAC_LEN         60
 104 #define X25_MAX_CUD_LEN         128
 105
 106 #define X25_FAC_CALLING_AE      0xCB
 107 #define X25_FAC_CALLED_AE       0xC9
 108
 109 #define X25_MARKER              0x00
 110 #define X25_DTE_SERVICES        0x0F
 111 #define X25_MAX_AE_LEN          40                      /* Max num of semi-octets in AE - OSI Nw */
 112 #define X25_MAX_DTE_FACIL_LEN   21                      /* Max length of DTE facility params */
 113
 114 /* Bitset in x25_sock->flags for misc flags */
 115 #define X25_Q_BIT_FLAG          0
 116 #define X25_INTERRUPT_FLAG      1
 117 #define X25_ACCPT_APPRV_FLAG    2
 118
 119 /**
 120  *      struct x25_route - x25 routing entry
 121  *      @node - entry in x25_list_lock
 122  *      @address - Start of address range
 123  *      @sigdigits - Number of sig digits
 124  *      @dev - More than one for MLP
 125  *      @refcnt - reference counter
 126  */
 127 struct x25_route {
 128         struct list_head        node;
 129         struct x25_address      address;
 130         unsigned int            sigdigits;
 131         struct net_device       *dev;
 132         atomic_t                refcnt;
 133 };
 134
 135 struct x25_neigh {
 136         struct list_head        node;
 137         struct net_device       *dev;
 138         unsigned int            state;
 139         unsigned int            extended;
 140         struct sk_buff_head     queue;
 141         unsigned long           t20;
 142         struct timer_list       t20timer;
 143         unsigned long           global_facil_mask;
 144         atomic_t                refcnt;
 145 };
 146
 147 struct x25_sock {
 148         struct sock             sk;
 149         struct x25_address      source_addr, dest_addr;
 150         struct x25_neigh        *neighbour;
 151         unsigned int            lci, cudmatchlength;
 152         unsigned char           state, condition;
 153         unsigned short          vs, vr, va, vl;
 154         unsigned long           t2, t21, t22, t23;
 155         unsigned short          fraglen;
 156         unsigned long           flags;
 157         struct sk_buff_head     ack_queue;
 158         struct sk_buff_head     fragment_queue;
 159         struct sk_buff_head     interrupt_in_queue;
 160         struct sk_buff_head     interrupt_out_queue;
 161         struct timer_list       timer;
 162         struct x25_causediag    causediag;
 163         struct x25_facilities   facilities;
 164         struct x25_dte_facilities dte_facilities;
 165         struct x25_calluserdata calluserdata;
 166         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
 167 };
 168
 169 struct x25_forward {
 170         struct list_head        node;
 171         unsigned int            lci;
 172         struct net_device       *dev1;
 173         struct net_device       *dev2;
 174         atomic_t                refcnt;
 175 };
 176
 177 static inline struct x25_sock *x25_sk(const struct sock *sk)
 178 {
 179         return (struct x25_sock *)sk;
 180 }
 181
 182 /* af_x25.c */
 183 extern int  sysctl_x25_restart_request_timeout;
 184 extern int  sysctl_x25_call_request_timeout;
 185 extern int  sysctl_x25_reset_request_timeout;
 186 extern int  sysctl_x25_clear_request_timeout;
 187 extern int  sysctl_x25_ack_holdback_timeout;
 188 extern int  sysctl_x25_forward;
 189
 190 int x25_parse_address_block(struct sk_buff *skb,
 191                             struct x25_address *called_addr,
 192                             struct x25_address *calling_addr);
 193
 194 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
 195 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
 196 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 197 void x25_destroy_socket_from_timer(struct sock *);
 198 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 199 void x25_kill_by_neigh(struct x25_neigh *);
 200
 201 /* x25_dev.c */
 202 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 203 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
 204                            struct packet_type *, struct net_device *);
 205 void x25_establish_link(struct x25_neigh *);
 206 void x25_terminate_link(struct x25_neigh *);
 207
 208 /* x25_facilities.c */
 209 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
 210                          struct x25_dte_facilities *, unsigned long *);
 211 int x25_create_facilities(unsigned char *, struct x25_facilities *,
 212                           struct x25_dte_facilities *, unsigned long);
 213 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
 214                              struct x25_facilities *,
 215                              struct x25_dte_facilities *);
 216 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
 217
 218 /* x25_forward.c */
 219 void x25_clear_forward_by_lci(unsigned int lci);
 220 void x25_clear_forward_by_dev(struct net_device *);
 221 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
 222 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
 223                      int);
 224
 225 /* x25_in.c */
 226 int x25_process_rx_frame(struct sock *, struct sk_buff *);
 227 int x25_backlog_rcv(struct sock *, struct sk_buff *);
 228
 229 /* x25_link.c */
 230 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 231 void x25_link_device_up(struct net_device *);
 232 void x25_link_device_down(struct net_device *);
 233 void x25_link_established(struct x25_neigh *);
 234 void x25_link_terminated(struct x25_neigh *);
 235 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
 236                                 unsigned char);
 237 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 238 int x25_subscr_ioctl(unsigned int, void __user *);
 239 struct x25_neigh *x25_get_neigh(struct net_device *);
 240 void x25_link_free(void);
 241
 242 /* x25_neigh.c */
 243 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 244 {
 245         atomic_inc(&nb->refcnt);
 246 }
 247
 248 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 249 {
 250         if (atomic_dec_and_test(&nb->refcnt))
 251                 kfree(nb);
 252 }
 253
 254 /* x25_out.c */
 255 int x25_output(struct sock *, struct sk_buff *);
 256 void x25_kick(struct sock *);
 257 void x25_enquiry_response(struct sock *);
 258
 259 /* x25_route.c */
 260 struct x25_route *x25_get_route(struct x25_address *addr);
 261 struct net_device *x25_dev_get(char *);
 262 void x25_route_device_down(struct net_device *dev);
 263 int x25_route_ioctl(unsigned int, void __user *);
 264 void x25_route_free(void);
 265
 266 static __inline__ void x25_route_hold(struct x25_route *rt)
 267 {
 268         atomic_inc(&rt->refcnt);
 269 }
 270
 271 static __inline__ void x25_route_put(struct x25_route *rt)
 272 {
 273         if (atomic_dec_and_test(&rt->refcnt))
 274                 kfree(rt);
 275 }
 276
 277 /* x25_subr.c */
 278 void x25_clear_queues(struct sock *);
 279 void x25_frames_acked(struct sock *, unsigned short);
 280 void x25_requeue_frames(struct sock *);
 281 int x25_validate_nr(struct sock *, unsigned short);
 282 void x25_write_internal(struct sock *, int);
 283 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
 284                int *);
 285 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
 286
 287 /* x25_timer.c */
 288 void x25_init_timers(struct sock *sk);
 289 void x25_start_heartbeat(struct sock *);
 290 void x25_start_t2timer(struct sock *);
 291 void x25_start_t21timer(struct sock *);
 292 void x25_start_t22timer(struct sock *);
 293 void x25_start_t23timer(struct sock *);
 294 void x25_stop_heartbeat(struct sock *);
 295 void x25_stop_timer(struct sock *);
 296 unsigned long x25_display_timer(struct sock *);
 297 void x25_check_rbuf(struct sock *);
 298
 299 /* sysctl_net_x25.c */
 300 #ifdef CONFIG_SYSCTL
 301 void x25_register_sysctl(void);
 302 void x25_unregister_sysctl(void);
 303 #else
 304 static inline void x25_register_sysctl(void) {};
 305 static inline void x25_unregister_sysctl(void) {};
 306 #endif /* CONFIG_SYSCTL */
 307
 308 struct x25_skb_cb {
 309         unsigned int flags;
 310 };
 311 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
 312
 313 extern struct hlist_head x25_list;
 314 extern rwlock_t x25_list_lock;
 315 extern struct list_head x25_route_list;
 316 extern rwlock_t x25_route_list_lock;
 317 extern struct list_head x25_forward_list;
 318 extern rwlock_t x25_forward_list_lock;
 319 extern struct list_head x25_neigh_list;
 320 extern rwlock_t x25_neigh_list_lock;
 321
 322 int x25_proc_init(void);
 323 void x25_proc_exit(void);
 324 #endif