linux/include/net/ax25.h
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   1/*
   2 *      Declarations of AX.25 type objects.
   3 *
   4 *      Alan Cox (GW4PTS)       10/11/93
   5 */
   6#ifndef _AX25_H
   7#define _AX25_H 
   8
   9#include <linux/ax25.h>
  10#include <linux/spinlock.h>
  11#include <linux/timer.h>
  12#include <linux/list.h>
  13#include <linux/slab.h>
  14#include <linux/atomic.h>
  15
  16#define AX25_T1CLAMPLO                  1
  17#define AX25_T1CLAMPHI                  (30 * HZ)
  18
  19#define AX25_BPQ_HEADER_LEN             16
  20#define AX25_KISS_HEADER_LEN            1
  21
  22#define AX25_HEADER_LEN                 17
  23#define AX25_ADDR_LEN                   7
  24#define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
  25#define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
  26
  27/* AX.25 Protocol IDs */
  28#define AX25_P_ROSE                     0x01
  29#define AX25_P_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
  30                                                /* Van Jacobsen (RFC 1144)    */
  31#define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
  32                                                /* Van Jacobsen (RFC 1144)    */
  33#define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
  34#define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
  35#define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
  36#define AX25_P_ATALK                    0xca    /* Appletalk                  */
  37#define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
  38#define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
  39#define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
  40#define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
  41#define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
  42#define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */
  43
  44/* AX.25 Segment control values */
  45#define AX25_SEG_REM                    0x7F
  46#define AX25_SEG_FIRST                  0x80
  47
  48#define AX25_CBIT                       0x80    /* Command/Response bit */
  49#define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
  50#define AX25_HBIT                       0x80    /* Has been repeated bit */
  51
  52#define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
  53#define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
  54#define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
  55
  56#define AX25_COND_ACK_PENDING           0x01
  57#define AX25_COND_REJECT                0x02
  58#define AX25_COND_PEER_RX_BUSY          0x04
  59#define AX25_COND_OWN_RX_BUSY           0x08
  60#define AX25_COND_DAMA_MODE             0x10
  61
  62#ifndef _LINUX_NETDEVICE_H
  63#include <linux/netdevice.h>
  64#endif
  65
  66/* Upper sub-layer (LAPB) definitions */
  67
  68/* Control field templates */
  69#define AX25_I                  0x00    /* Information frames */
  70#define AX25_S                  0x01    /* Supervisory frames */
  71#define AX25_RR                 0x01    /* Receiver ready */
  72#define AX25_RNR                0x05    /* Receiver not ready */
  73#define AX25_REJ                0x09    /* Reject */
  74#define AX25_U                  0x03    /* Unnumbered frames */
  75#define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
  76#define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
  77#define AX25_DISC               0x43    /* Disconnect */
  78#define AX25_DM                 0x0f    /* Disconnected mode */
  79#define AX25_UA                 0x63    /* Unnumbered acknowledge */
  80#define AX25_FRMR               0x87    /* Frame reject */
  81#define AX25_UI                 0x03    /* Unnumbered information */
  82#define AX25_XID                0xaf    /* Exchange information */
  83#define AX25_TEST               0xe3    /* Test */
  84
  85#define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
  86#define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
  87
  88#define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
  89
  90#define AX25_POLLOFF            0
  91#define AX25_POLLON             1
  92
  93/* AX25 L2 C-bit */
  94#define AX25_COMMAND            1
  95#define AX25_RESPONSE           2
  96
  97/* Define Link State constants. */
  98
  99enum { 
 100        AX25_STATE_0,                   /* Listening */
 101        AX25_STATE_1,                   /* SABM sent */
 102        AX25_STATE_2,                   /* DISC sent */
 103        AX25_STATE_3,                   /* Established */
 104        AX25_STATE_4                    /* Recovery */
 105};
 106
 107#define AX25_MODULUS            8       /*  Standard AX.25 modulus */
 108#define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
 109
 110enum {
 111        AX25_PROTO_STD_SIMPLEX,
 112        AX25_PROTO_STD_DUPLEX,
 113#ifdef CONFIG_AX25_DAMA_SLAVE
 114        AX25_PROTO_DAMA_SLAVE,
 115#ifdef CONFIG_AX25_DAMA_MASTER
 116        AX25_PROTO_DAMA_MASTER,
 117#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
 118#endif
 119#endif
 120        __AX25_PROTO_MAX,
 121        AX25_PROTO_MAX = __AX25_PROTO_MAX -1
 122};
 123
 124enum {
 125        AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
 126        AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
 127        AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
 128        AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
 129        AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
 130        AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
 131        AX25_VALUES_T1,         /* Default T1 timeout value */
 132        AX25_VALUES_T2,         /* Default T2 timeout value */
 133        AX25_VALUES_T3,         /* Default T3 timeout value */
 134        AX25_VALUES_IDLE,       /* Connected mode idle timer */
 135        AX25_VALUES_N2,         /* Default N2 value */
 136        AX25_VALUES_PACLEN,     /* AX.25 MTU */
 137        AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
 138        AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
 139        AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
 140};
 141
 142#define AX25_DEF_IPDEFMODE      0                       /* Datagram */
 143#define AX25_DEF_AXDEFMODE      0                       /* Normal */
 144#define AX25_DEF_BACKOFF        1                       /* Linear backoff */
 145#define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
 146#define AX25_DEF_WINDOW         2                       /* Window=2 */
 147#define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
 148#define AX25_DEF_T1             10000                   /* T1=10s */
 149#define AX25_DEF_T2             3000                    /* T2=3s  */
 150#define AX25_DEF_T3             300000                  /* T3=300s */
 151#define AX25_DEF_N2             10                      /* N2=10 */
 152#define AX25_DEF_IDLE           0                       /* Idle=None */
 153#define AX25_DEF_PACLEN         256                     /* Paclen=256 */
 154#define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
 155#define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */
 156
 157typedef struct ax25_uid_assoc {
 158        struct hlist_node       uid_node;
 159        atomic_t                refcount;
 160        uid_t                   uid;
 161        ax25_address            call;
 162} ax25_uid_assoc;
 163
 164#define ax25_uid_for_each(__ax25, node, list) \
 165        hlist_for_each_entry(__ax25, node, list, uid_node)
 166
 167#define ax25_uid_hold(ax25) \
 168        atomic_inc(&((ax25)->refcount))
 169
 170static inline void ax25_uid_put(ax25_uid_assoc *assoc)
 171{
 172        if (atomic_dec_and_test(&assoc->refcount)) {
 173                kfree(assoc);
 174        }
 175}
 176
 177typedef struct {
 178        ax25_address            calls[AX25_MAX_DIGIS];
 179        unsigned char           repeated[AX25_MAX_DIGIS];
 180        unsigned char           ndigi;
 181        signed char             lastrepeat;
 182} ax25_digi;
 183
 184typedef struct ax25_route {
 185        struct ax25_route       *next;
 186        atomic_t                refcount;
 187        ax25_address            callsign;
 188        struct net_device       *dev;
 189        ax25_digi               *digipeat;
 190        char                    ip_mode;
 191} ax25_route;
 192
 193static inline void ax25_hold_route(ax25_route *ax25_rt)
 194{
 195        atomic_inc(&ax25_rt->refcount);
 196}
 197
 198extern void __ax25_put_route(ax25_route *ax25_rt);
 199
 200static inline void ax25_put_route(ax25_route *ax25_rt)
 201{
 202        if (atomic_dec_and_test(&ax25_rt->refcount))
 203                __ax25_put_route(ax25_rt);
 204}
 205
 206typedef struct {
 207        char                    slave;                  /* slave_mode?   */
 208        struct timer_list       slave_timer;            /* timeout timer */
 209        unsigned short          slave_timeout;          /* when? */
 210} ax25_dama_info;
 211
 212struct ctl_table;
 213
 214typedef struct ax25_dev {
 215        struct ax25_dev         *next;
 216        struct net_device       *dev;
 217        struct net_device       *forward;
 218        struct ctl_table_header *sysheader;
 219        int                     values[AX25_MAX_VALUES];
 220#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
 221        ax25_dama_info          dama;
 222#endif
 223} ax25_dev;
 224
 225typedef struct ax25_cb {
 226        struct hlist_node       ax25_node;
 227        ax25_address            source_addr, dest_addr;
 228        ax25_digi               *digipeat;
 229        ax25_dev                *ax25_dev;
 230        unsigned char           iamdigi;
 231        unsigned char           state, modulus, pidincl;
 232        unsigned short          vs, vr, va;
 233        unsigned char           condition, backoff;
 234        unsigned char           n2, n2count;
 235        struct timer_list       t1timer, t2timer, t3timer, idletimer;
 236        unsigned long           t1, t2, t3, idle, rtt;
 237        unsigned short          paclen, fragno, fraglen;
 238        struct sk_buff_head     write_queue;
 239        struct sk_buff_head     reseq_queue;
 240        struct sk_buff_head     ack_queue;
 241        struct sk_buff_head     frag_queue;
 242        unsigned char           window;
 243        struct timer_list       timer, dtimer;
 244        struct sock             *sk;            /* Backlink to socket */
 245        atomic_t                refcount;
 246} ax25_cb;
 247
 248#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
 249
 250#define ax25_for_each(__ax25, node, list) \
 251        hlist_for_each_entry(__ax25, node, list, ax25_node)
 252
 253#define ax25_cb_hold(__ax25) \
 254        atomic_inc(&((__ax25)->refcount))
 255
 256static __inline__ void ax25_cb_put(ax25_cb *ax25)
 257{
 258        if (atomic_dec_and_test(&ax25->refcount)) {
 259                kfree(ax25->digipeat);
 260                kfree(ax25);
 261        }
 262}
 263
 264static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
 265{
 266        skb->dev      = dev;
 267        skb_reset_mac_header(skb);
 268        skb->pkt_type = PACKET_HOST;
 269        return htons(ETH_P_AX25);
 270}
 271
 272/* af_ax25.c */
 273extern struct hlist_head ax25_list;
 274extern spinlock_t ax25_list_lock;
 275extern void ax25_cb_add(ax25_cb *);
 276struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
 277struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
 278extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 279extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
 280extern void ax25_destroy_socket(ax25_cb *);
 281extern ax25_cb * __must_check ax25_create_cb(void);
 282extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
 283extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
 284
 285/* ax25_addr.c */
 286extern const ax25_address ax25_bcast;
 287extern const ax25_address ax25_defaddr;
 288extern const ax25_address null_ax25_address;
 289extern char *ax2asc(char *buf, const ax25_address *);
 290extern void asc2ax(ax25_address *addr, const char *callsign);
 291extern int ax25cmp(const ax25_address *, const ax25_address *);
 292extern int ax25digicmp(const ax25_digi *, const ax25_digi *);
 293extern const unsigned char *ax25_addr_parse(const unsigned char *, int,
 294        ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 295extern int  ax25_addr_build(unsigned char *, const ax25_address *,
 296        const ax25_address *, const ax25_digi *, int, int);
 297extern int  ax25_addr_size(const ax25_digi *);
 298extern void ax25_digi_invert(const ax25_digi *, ax25_digi *);
 299
 300/* ax25_dev.c */
 301extern ax25_dev *ax25_dev_list;
 302extern spinlock_t ax25_dev_lock;
 303
 304static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
 305{
 306        return dev->ax25_ptr;
 307}
 308
 309extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
 310extern void ax25_dev_device_up(struct net_device *);
 311extern void ax25_dev_device_down(struct net_device *);
 312extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
 313extern struct net_device *ax25_fwd_dev(struct net_device *);
 314extern void ax25_dev_free(void);
 315
 316/* ax25_ds_in.c */
 317extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
 318
 319/* ax25_ds_subr.c */
 320extern void ax25_ds_nr_error_recovery(ax25_cb *);
 321extern void ax25_ds_enquiry_response(ax25_cb *);
 322extern void ax25_ds_establish_data_link(ax25_cb *);
 323extern void ax25_dev_dama_off(ax25_dev *);
 324extern void ax25_dama_on(ax25_cb *);
 325extern void ax25_dama_off(ax25_cb *);
 326
 327/* ax25_ds_timer.c */
 328extern void ax25_ds_setup_timer(ax25_dev *);
 329extern void ax25_ds_set_timer(ax25_dev *);
 330extern void ax25_ds_del_timer(ax25_dev *);
 331extern void ax25_ds_timer(ax25_cb *);
 332extern void ax25_ds_t1_timeout(ax25_cb *);
 333extern void ax25_ds_heartbeat_expiry(ax25_cb *);
 334extern void ax25_ds_t3timer_expiry(ax25_cb *);
 335extern void ax25_ds_idletimer_expiry(ax25_cb *);
 336
 337/* ax25_iface.c */
 338
 339struct ax25_protocol {
 340        struct ax25_protocol *next;
 341        unsigned int pid;
 342        int (*func)(struct sk_buff *, ax25_cb *);
 343};
 344
 345extern void ax25_register_pid(struct ax25_protocol *ap);
 346extern void ax25_protocol_release(unsigned int);
 347
 348struct ax25_linkfail {
 349        struct hlist_node lf_node;
 350        void (*func)(ax25_cb *, int);
 351};
 352
 353extern void ax25_linkfail_register(struct ax25_linkfail *lf);
 354extern void ax25_linkfail_release(struct ax25_linkfail *lf);
 355extern int __must_check ax25_listen_register(ax25_address *,
 356        struct net_device *);
 357extern void ax25_listen_release(ax25_address *, struct net_device *);
 358extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
 359extern int  ax25_listen_mine(ax25_address *, struct net_device *);
 360extern void ax25_link_failed(ax25_cb *, int);
 361extern int  ax25_protocol_is_registered(unsigned int);
 362
 363/* ax25_in.c */
 364extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 365extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 366
 367/* ax25_ip.c */
 368extern int ax25_hard_header(struct sk_buff *, struct net_device *,
 369                            unsigned short, const void *,
 370                            const void *, unsigned int);
 371extern int  ax25_rebuild_header(struct sk_buff *);
 372extern const struct header_ops ax25_header_ops;
 373
 374/* ax25_out.c */
 375extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 376extern void ax25_output(ax25_cb *, int, struct sk_buff *);
 377extern void ax25_kick(ax25_cb *);
 378extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
 379extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 380extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);
 381
 382/* ax25_route.c */
 383extern void ax25_rt_device_down(struct net_device *);
 384extern int  ax25_rt_ioctl(unsigned int, void __user *);
 385extern const struct file_operations ax25_route_fops;
 386extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
 387extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
 388extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
 389extern void ax25_rt_free(void);
 390
 391/* ax25_std_in.c */
 392extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
 393
 394/* ax25_std_subr.c */
 395extern void ax25_std_nr_error_recovery(ax25_cb *);
 396extern void ax25_std_establish_data_link(ax25_cb *);
 397extern void ax25_std_transmit_enquiry(ax25_cb *);
 398extern void ax25_std_enquiry_response(ax25_cb *);
 399extern void ax25_std_timeout_response(ax25_cb *);
 400
 401/* ax25_std_timer.c */
 402extern void ax25_std_heartbeat_expiry(ax25_cb *);
 403extern void ax25_std_t1timer_expiry(ax25_cb *);
 404extern void ax25_std_t2timer_expiry(ax25_cb *);
 405extern void ax25_std_t3timer_expiry(ax25_cb *);
 406extern void ax25_std_idletimer_expiry(ax25_cb *);
 407
 408/* ax25_subr.c */
 409extern void ax25_clear_queues(ax25_cb *);
 410extern void ax25_frames_acked(ax25_cb *, unsigned short);
 411extern void ax25_requeue_frames(ax25_cb *);
 412extern int  ax25_validate_nr(ax25_cb *, unsigned short);
 413extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
 414extern void ax25_send_control(ax25_cb *, int, int, int);
 415extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
 416extern void ax25_calculate_t1(ax25_cb *);
 417extern void ax25_calculate_rtt(ax25_cb *);
 418extern void ax25_disconnect(ax25_cb *, int);
 419
 420/* ax25_timer.c */
 421extern void ax25_setup_timers(ax25_cb *);
 422extern void ax25_start_heartbeat(ax25_cb *);
 423extern void ax25_start_t1timer(ax25_cb *);
 424extern void ax25_start_t2timer(ax25_cb *);
 425extern void ax25_start_t3timer(ax25_cb *);
 426extern void ax25_start_idletimer(ax25_cb *);
 427extern void ax25_stop_heartbeat(ax25_cb *);
 428extern void ax25_stop_t1timer(ax25_cb *);
 429extern void ax25_stop_t2timer(ax25_cb *);
 430extern void ax25_stop_t3timer(ax25_cb *);
 431extern void ax25_stop_idletimer(ax25_cb *);
 432extern int  ax25_t1timer_running(ax25_cb *);
 433extern unsigned long ax25_display_timer(struct timer_list *);
 434
 435/* ax25_uid.c */
 436extern int  ax25_uid_policy;
 437extern ax25_uid_assoc *ax25_findbyuid(uid_t);
 438extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
 439extern const struct file_operations ax25_uid_fops;
 440extern void ax25_uid_free(void);
 441
 442/* sysctl_net_ax25.c */
 443#ifdef CONFIG_SYSCTL
 444extern int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
 445extern void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
 446#else
 447static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
 448static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
 449#endif /* CONFIG_SYSCTL */
 450
 451#endif
 452
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