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root/include/net/ax25.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. ax25_uid_put
  2. ax25_hold_route
  3. ax25_put_route
  4. ax25_cb_put
  5. ax25_type_trans
  6. ax25_dev_ax25dev
  7. ax25_protocol_function
  8. ax25_unregister_sysctl

/*
 *      Declarations of AX.25 type objects.
 *
 *      Alan Cox (GW4PTS)       10/11/93
 */
#ifndef _AX25_H
#define _AX25_H 

#include <linux/ax25.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <asm/atomic.h>

#define AX25_T1CLAMPLO                  1
#define AX25_T1CLAMPHI                  (30 * HZ)

#define AX25_BPQ_HEADER_LEN             16
#define AX25_KISS_HEADER_LEN            1

#define AX25_HEADER_LEN                 17
#define AX25_ADDR_LEN                   7
#define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
#define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)

/* AX.25 Protocol IDs */
#define AX25_P_ROSE                     0x01
#define AX25_P_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
                                                /* Van Jacobsen (RFC 1144)    */
#define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
                                                /* Van Jacobsen (RFC 1144)    */
#define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
#define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
#define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
#define AX25_P_ATALK                    0xca    /* Appletalk                  */
#define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
#define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
#define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
#define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
#define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
#define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */

/* AX.25 Segment control values */
#define AX25_SEG_REM                    0x7F
#define AX25_SEG_FIRST                  0x80

#define AX25_CBIT                       0x80    /* Command/Response bit */
#define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
#define AX25_HBIT                       0x80    /* Has been repeated bit */

#define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
#define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
#define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */

#define AX25_COND_ACK_PENDING           0x01
#define AX25_COND_REJECT                0x02
#define AX25_COND_PEER_RX_BUSY          0x04
#define AX25_COND_OWN_RX_BUSY           0x08
#define AX25_COND_DAMA_MODE             0x10

#ifndef _LINUX_NETDEVICE_H
#include <linux/netdevice.h>
#endif

/* Upper sub-layer (LAPB) definitions */

/* Control field templates */
#define AX25_I                  0x00    /* Information frames */
#define AX25_S                  0x01    /* Supervisory frames */
#define AX25_RR                 0x01    /* Receiver ready */
#define AX25_RNR                0x05    /* Receiver not ready */
#define AX25_REJ                0x09    /* Reject */
#define AX25_U                  0x03    /* Unnumbered frames */
#define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
#define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
#define AX25_DISC               0x43    /* Disconnect */
#define AX25_DM                 0x0f    /* Disconnected mode */
#define AX25_UA                 0x63    /* Unnumbered acknowledge */
#define AX25_FRMR               0x87    /* Frame reject */
#define AX25_UI                 0x03    /* Unnumbered information */
#define AX25_XID                0xaf    /* Exchange information */
#define AX25_TEST               0xe3    /* Test */

#define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
#define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */

#define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */

#define AX25_POLLOFF            0
#define AX25_POLLON             1

/* AX25 L2 C-bit */
#define AX25_COMMAND            1
#define AX25_RESPONSE           2

/* Define Link State constants. */

enum { 
        AX25_STATE_0,                   /* Listening */
        AX25_STATE_1,                   /* SABM sent */
        AX25_STATE_2,                   /* DISC sent */
        AX25_STATE_3,                   /* Established */
        AX25_STATE_4                    /* Recovery */
};

#define AX25_MODULUS            8       /*  Standard AX.25 modulus */
#define AX25_EMODULUS           128     /*  Extended AX.25 modulus */

enum {
        AX25_PROTO_STD_SIMPLEX,
        AX25_PROTO_STD_DUPLEX,
#ifdef CONFIG_AX25_DAMA_SLAVE
        AX25_PROTO_DAMA_SLAVE,
#ifdef CONFIG_AX25_DAMA_MASTER
        AX25_PROTO_DAMA_MASTER,
#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
#endif
#endif
        __AX25_PROTO_MAX,
        AX25_PROTO_MAX = __AX25_PROTO_MAX -1
};

enum {
        AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
        AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
        AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
        AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
        AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
        AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
        AX25_VALUES_T1,         /* Default T1 timeout value */
        AX25_VALUES_T2,         /* Default T2 timeout value */
        AX25_VALUES_T3,         /* Default T3 timeout value */
        AX25_VALUES_IDLE,       /* Connected mode idle timer */
        AX25_VALUES_N2,         /* Default N2 value */
        AX25_VALUES_PACLEN,     /* AX.25 MTU */
        AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
        AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
        AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
};

#define AX25_DEF_IPDEFMODE      0                       /* Datagram */
#define AX25_DEF_AXDEFMODE      0                       /* Normal */
#define AX25_DEF_BACKOFF        1                       /* Linear backoff */
#define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
#define AX25_DEF_WINDOW         2                       /* Window=2 */
#define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
#define AX25_DEF_T1             10000                   /* T1=10s */
#define AX25_DEF_T2             3000                    /* T2=3s  */
#define AX25_DEF_T3             300000                  /* T3=300s */
#define AX25_DEF_N2             10                      /* N2=10 */
#define AX25_DEF_IDLE           0                       /* Idle=None */
#define AX25_DEF_PACLEN         256                     /* Paclen=256 */
#define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
#define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */

typedef struct ax25_uid_assoc {
        struct hlist_node       uid_node;
        atomic_t                refcount;
        uid_t                   uid;
        ax25_address            call;
} ax25_uid_assoc;

#define ax25_uid_for_each(__ax25, node, list) \
        hlist_for_each_entry(__ax25, node, list, uid_node)

#define ax25_uid_hold(ax25) \
        atomic_inc(&((ax25)->refcount))

static inline void ax25_uid_put(ax25_uid_assoc *assoc)
{
        if (atomic_dec_and_test(&assoc->refcount)) {
                kfree(assoc);
        }
}

typedef struct {
        ax25_address            calls[AX25_MAX_DIGIS];
        unsigned char           repeated[AX25_MAX_DIGIS];
        unsigned char           ndigi;
        signed char             lastrepeat;
} ax25_digi;

typedef struct ax25_route {
        struct ax25_route       *next;
        atomic_t                refcount;
        ax25_address            callsign;
        struct net_device       *dev;
        ax25_digi               *digipeat;
        char                    ip_mode;
} ax25_route;

static inline void ax25_hold_route(ax25_route *ax25_rt)
{
        atomic_inc(&ax25_rt->refcount);
}

extern void __ax25_put_route(ax25_route *ax25_rt);

static inline void ax25_put_route(ax25_route *ax25_rt)
{
        if (atomic_dec_and_test(&ax25_rt->refcount))
                __ax25_put_route(ax25_rt);
}

typedef struct {
        char                    slave;                  /* slave_mode?   */
        struct timer_list       slave_timer;            /* timeout timer */
        unsigned short          slave_timeout;          /* when? */
} ax25_dama_info;

struct ctl_table;

typedef struct ax25_dev {
        struct ax25_dev         *next;
        struct net_device       *dev;
        struct net_device       *forward;
        struct ctl_table        *systable;
        int                     values[AX25_MAX_VALUES];
#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
        ax25_dama_info          dama;
#endif
} ax25_dev;

typedef struct ax25_cb {
        struct hlist_node       ax25_node;
        ax25_address            source_addr, dest_addr;
        ax25_digi               *digipeat;
        ax25_dev                *ax25_dev;
        unsigned char           iamdigi;
        unsigned char           state, modulus, pidincl;
        unsigned short          vs, vr, va;
        unsigned char           condition, backoff;
        unsigned char           n2, n2count;
        struct timer_list       t1timer, t2timer, t3timer, idletimer;
        unsigned long           t1, t2, t3, idle, rtt;
        unsigned short          paclen, fragno, fraglen;
        struct sk_buff_head     write_queue;
        struct sk_buff_head     reseq_queue;
        struct sk_buff_head     ack_queue;
        struct sk_buff_head     frag_queue;
        unsigned char           window;
        struct timer_list       timer, dtimer;
        struct sock             *sk;            /* Backlink to socket */
        atomic_t                refcount;
} ax25_cb;

#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)

#define ax25_for_each(__ax25, node, list) \
        hlist_for_each_entry(__ax25, node, list, ax25_node)

#define ax25_cb_hold(__ax25) \
        atomic_inc(&((__ax25)->refcount))

static __inline__ void ax25_cb_put(ax25_cb *ax25)
{
        if (atomic_dec_and_test(&ax25->refcount)) {
                kfree(ax25->digipeat);
                kfree(ax25);
        }
}

static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
{
        skb->dev      = dev;
        skb_reset_mac_header(skb);
        skb->pkt_type = PACKET_HOST;
        return htons(ETH_P_AX25);
}

/* af_ax25.c */
extern struct hlist_head ax25_list;
extern spinlock_t ax25_list_lock;
extern void ax25_cb_add(ax25_cb *);
struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
extern void ax25_destroy_socket(ax25_cb *);
extern ax25_cb * __must_check ax25_create_cb(void);
extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);

/* ax25_addr.c */
extern const ax25_address ax25_bcast;
extern const ax25_address ax25_defaddr;
extern const ax25_address null_ax25_address;
extern char *ax2asc(char *buf, const ax25_address *);
extern void asc2ax(ax25_address *addr, const char *callsign);
extern int ax25cmp(const ax25_address *, const ax25_address *);
extern int ax25digicmp(const ax25_digi *, const ax25_digi *);
extern const unsigned char *ax25_addr_parse(const unsigned char *, int,
        ax25_address *, ax25_address *, ax25_digi *, int *, int *);
extern int  ax25_addr_build(unsigned char *, const ax25_address *,
        const ax25_address *, const ax25_digi *, int, int);
extern int  ax25_addr_size(const ax25_digi *);
extern void ax25_digi_invert(const ax25_digi *, ax25_digi *);

/* ax25_dev.c */
extern ax25_dev *ax25_dev_list;
extern spinlock_t ax25_dev_lock;

static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
{
        return dev->ax25_ptr;
}

extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
extern void ax25_dev_device_up(struct net_device *);
extern void ax25_dev_device_down(struct net_device *);
extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
extern struct net_device *ax25_fwd_dev(struct net_device *);
extern void ax25_dev_free(void);

/* ax25_ds_in.c */
extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);

/* ax25_ds_subr.c */
extern void ax25_ds_nr_error_recovery(ax25_cb *);
extern void ax25_ds_enquiry_response(ax25_cb *);
extern void ax25_ds_establish_data_link(ax25_cb *);
extern void ax25_dev_dama_off(ax25_dev *);
extern void ax25_dama_on(ax25_cb *);
extern void ax25_dama_off(ax25_cb *);

/* ax25_ds_timer.c */
extern void ax25_ds_setup_timer(ax25_dev *);
extern void ax25_ds_set_timer(ax25_dev *);
extern void ax25_ds_del_timer(ax25_dev *);
extern void ax25_ds_timer(ax25_cb *);
extern void ax25_ds_t1_timeout(ax25_cb *);
extern void ax25_ds_heartbeat_expiry(ax25_cb *);
extern void ax25_ds_t3timer_expiry(ax25_cb *);
extern void ax25_ds_idletimer_expiry(ax25_cb *);

/* ax25_iface.c */

struct ax25_protocol {
        struct ax25_protocol *next;
        unsigned int pid;
        int (*func)(struct sk_buff *, ax25_cb *);
};

extern void ax25_register_pid(struct ax25_protocol *ap);
extern void ax25_protocol_release(unsigned int);

struct ax25_linkfail {
        struct hlist_node lf_node;
        void (*func)(ax25_cb *, int);
};

extern void ax25_linkfail_register(struct ax25_linkfail *lf);
extern void ax25_linkfail_release(struct ax25_linkfail *lf);
extern int __must_check ax25_listen_register(ax25_address *,
        struct net_device *);
extern void ax25_listen_release(ax25_address *, struct net_device *);
extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
extern int  ax25_listen_mine(ax25_address *, struct net_device *);
extern void ax25_link_failed(ax25_cb *, int);
extern int  ax25_protocol_is_registered(unsigned int);

/* ax25_in.c */
extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);

/* ax25_ip.c */
extern int ax25_hard_header(struct sk_buff *, struct net_device *,
                            unsigned short, const void *,
                            const void *, unsigned int);
extern int  ax25_rebuild_header(struct sk_buff *);
extern const struct header_ops ax25_header_ops;

/* ax25_out.c */
extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
extern void ax25_output(ax25_cb *, int, struct sk_buff *);
extern void ax25_kick(ax25_cb *);
extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);

/* ax25_route.c */
extern void ax25_rt_device_down(struct net_device *);
extern int  ax25_rt_ioctl(unsigned int, void __user *);
extern const struct file_operations ax25_route_fops;
extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
extern void ax25_rt_free(void);

/* ax25_std_in.c */
extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);

/* ax25_std_subr.c */
extern void ax25_std_nr_error_recovery(ax25_cb *);
extern void ax25_std_establish_data_link(ax25_cb *);
extern void ax25_std_transmit_enquiry(ax25_cb *);
extern void ax25_std_enquiry_response(ax25_cb *);
extern void ax25_std_timeout_response(ax25_cb *);

/* ax25_std_timer.c */
extern void ax25_std_heartbeat_expiry(ax25_cb *);
extern void ax25_std_t1timer_expiry(ax25_cb *);
extern void ax25_std_t2timer_expiry(ax25_cb *);
extern void ax25_std_t3timer_expiry(ax25_cb *);
extern void ax25_std_idletimer_expiry(ax25_cb *);

/* ax25_subr.c */
extern void ax25_clear_queues(ax25_cb *);
extern void ax25_frames_acked(ax25_cb *, unsigned short);
extern void ax25_requeue_frames(ax25_cb *);
extern int  ax25_validate_nr(ax25_cb *, unsigned short);
extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
extern void ax25_send_control(ax25_cb *, int, int, int);
extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
extern void ax25_calculate_t1(ax25_cb *);
extern void ax25_calculate_rtt(ax25_cb *);
extern void ax25_disconnect(ax25_cb *, int);

/* ax25_timer.c */
extern void ax25_setup_timers(ax25_cb *);
extern void ax25_start_heartbeat(ax25_cb *);
extern void ax25_start_t1timer(ax25_cb *);
extern void ax25_start_t2timer(ax25_cb *);
extern void ax25_start_t3timer(ax25_cb *);
extern void ax25_start_idletimer(ax25_cb *);
extern void ax25_stop_heartbeat(ax25_cb *);
extern void ax25_stop_t1timer(ax25_cb *);
extern void ax25_stop_t2timer(ax25_cb *);
extern void ax25_stop_t3timer(ax25_cb *);
extern void ax25_stop_idletimer(ax25_cb *);
extern int  ax25_t1timer_running(ax25_cb *);
extern unsigned long ax25_display_timer(struct timer_list *);

/* ax25_uid.c */
extern int  ax25_uid_policy;
extern ax25_uid_assoc *ax25_findbyuid(uid_t);
extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
extern const struct file_operations ax25_uid_fops;
extern void ax25_uid_free(void);

/* sysctl_net_ax25.c */
#ifdef CONFIG_SYSCTL
extern void ax25_register_sysctl(void);
extern void ax25_unregister_sysctl(void);
#else
static inline void ax25_register_sysctl(void) {};
static inline void ax25_unregister_sysctl(void) {};
#endif /* CONFIG_SYSCTL */

#endif

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