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Diffstat (limited to '')
| -rw-r--r-- | include/net/ax25.h | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/include/net/ax25.h b/include/net/ax25.h new file mode 100644 index 000000000..f8cf3629a --- /dev/null +++ b/include/net/ax25.h @@ -0,0 +1,489 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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 <linux/slab.h> +#include <linux/refcount.h> +#include <net/neighbour.h> +#include <net/sock.h> +#include <linux/seq_file.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; + refcount_t refcount; + kuid_t uid; + ax25_address call; +} ax25_uid_assoc; + +#define ax25_uid_for_each(__ax25, list) \ + hlist_for_each_entry(__ax25, list, uid_node) + +#define ax25_uid_hold(ax25) \ + refcount_inc(&((ax25)->refcount)) + +static inline void ax25_uid_put(ax25_uid_assoc *assoc) +{ + if (refcount_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; + ax25_address callsign; + struct net_device *dev; + ax25_digi *digipeat; + char ip_mode; +} ax25_route; + +void __ax25_put_route(ax25_route *ax25_rt); + +extern rwlock_t ax25_route_lock; + +static inline void ax25_route_lock_use(void) +{ + read_lock(&ax25_route_lock); +} + +static inline void ax25_route_lock_unuse(void) +{ + read_unlock(&ax25_route_lock); +} + +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; + netdevice_tracker dev_tracker; + + struct net_device *forward; + struct ctl_table_header *sysheader; + int values[AX25_MAX_VALUES]; +#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) + ax25_dama_info dama; +#endif + refcount_t refcount; + bool device_up; +} ax25_dev; + +typedef struct ax25_cb { + struct hlist_node ax25_node; + ax25_address source_addr, dest_addr; + ax25_digi *digipeat; + ax25_dev *ax25_dev; + netdevice_tracker dev_tracker; + 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 */ + refcount_t refcount; +} ax25_cb; + +struct ax25_sock { + struct sock sk; + struct ax25_cb *cb; +}; + +static inline struct ax25_sock *ax25_sk(const struct sock *sk) +{ + return (struct ax25_sock *) sk; +} + +static inline struct ax25_cb *sk_to_ax25(const struct sock *sk) +{ + return ax25_sk(sk)->cb; +} + +#define ax25_for_each(__ax25, list) \ + hlist_for_each_entry(__ax25, list, ax25_node) + +#define ax25_cb_hold(__ax25) \ + refcount_inc(&((__ax25)->refcount)) + +static __inline__ void ax25_cb_put(ax25_cb *ax25) +{ + if (refcount_dec_and_test(&ax25->refcount)) { + kfree(ax25->digipeat); + kfree(ax25); + } +} + +static inline void ax25_dev_hold(ax25_dev *ax25_dev) +{ + refcount_inc(&ax25_dev->refcount); +} + +static inline void ax25_dev_put(ax25_dev *ax25_dev) +{ + if (refcount_dec_and_test(&ax25_dev->refcount)) { + kfree(ax25_dev); + } +} +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; +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); +ax25_cb *ax25_find_cb(const ax25_address *, ax25_address *, ax25_digi *, + struct net_device *); +void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); +void ax25_destroy_socket(ax25_cb *); +ax25_cb * __must_check ax25_create_cb(void); +void ax25_fillin_cb(ax25_cb *, ax25_dev *); +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; +char *ax2asc(char *buf, const ax25_address *); +void asc2ax(ax25_address *addr, const char *callsign); +int ax25cmp(const ax25_address *, const ax25_address *); +int ax25digicmp(const ax25_digi *, const ax25_digi *); +const unsigned char *ax25_addr_parse(const unsigned char *, int, + ax25_address *, ax25_address *, ax25_digi *, int *, int *); +int ax25_addr_build(unsigned char *, const ax25_address *, + const ax25_address *, const ax25_digi *, int, int); +int ax25_addr_size(const ax25_digi *); +void ax25_digi_invert(const ax25_digi *, ax25_digi *); + +/* ax25_dev.c */ +extern ax25_dev *ax25_dev_list; +extern spinlock_t ax25_dev_lock; + +#if IS_ENABLED(CONFIG_AX25) +static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev) +{ + return dev->ax25_ptr; +} +#endif + +ax25_dev *ax25_addr_ax25dev(ax25_address *); +void ax25_dev_device_up(struct net_device *); +void ax25_dev_device_down(struct net_device *); +int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); +struct net_device *ax25_fwd_dev(struct net_device *); +void ax25_dev_free(void); + +/* ax25_ds_in.c */ +int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); + +/* ax25_ds_subr.c */ +void ax25_ds_nr_error_recovery(ax25_cb *); +void ax25_ds_enquiry_response(ax25_cb *); +void ax25_ds_establish_data_link(ax25_cb *); +void ax25_dev_dama_off(ax25_dev *); +void ax25_dama_on(ax25_cb *); +void ax25_dama_off(ax25_cb *); + +/* ax25_ds_timer.c */ +void ax25_ds_setup_timer(ax25_dev *); +void ax25_ds_set_timer(ax25_dev *); +void ax25_ds_del_timer(ax25_dev *); +void ax25_ds_timer(ax25_cb *); +void ax25_ds_t1_timeout(ax25_cb *); +void ax25_ds_heartbeat_expiry(ax25_cb *); +void ax25_ds_t3timer_expiry(ax25_cb *); +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 *); +}; + +void ax25_register_pid(struct ax25_protocol *ap); +void ax25_protocol_release(unsigned int); + +struct ax25_linkfail { + struct hlist_node lf_node; + void (*func)(ax25_cb *, int); +}; + +void ax25_linkfail_register(struct ax25_linkfail *lf); +void ax25_linkfail_release(struct ax25_linkfail *lf); +int __must_check ax25_listen_register(const ax25_address *, + struct net_device *); +void ax25_listen_release(const ax25_address *, struct net_device *); +int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); +int ax25_listen_mine(const ax25_address *, struct net_device *); +void ax25_link_failed(ax25_cb *, int); +int ax25_protocol_is_registered(unsigned int); + +/* ax25_in.c */ +int ax25_rx_iframe(ax25_cb *, struct sk_buff *); +int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, + struct net_device *); + +/* ax25_ip.c */ +netdev_tx_t ax25_ip_xmit(struct sk_buff *skb); +extern const struct header_ops ax25_header_ops; + +/* ax25_out.c */ +ax25_cb *ax25_send_frame(struct sk_buff *, int, const ax25_address *, + ax25_address *, ax25_digi *, struct net_device *); +void ax25_output(ax25_cb *, int, struct sk_buff *); +void ax25_kick(ax25_cb *); +void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); +void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); +int ax25_check_iframes_acked(ax25_cb *, unsigned short); + +/* ax25_route.c */ +void ax25_rt_device_down(struct net_device *); +int ax25_rt_ioctl(unsigned int, void __user *); +extern const struct seq_operations ax25_rt_seqops; +ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev); +int ax25_rt_autobind(ax25_cb *, ax25_address *); +struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, + ax25_address *, ax25_digi *); +void ax25_rt_free(void); + +/* ax25_std_in.c */ +int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); + +/* ax25_std_subr.c */ +void ax25_std_nr_error_recovery(ax25_cb *); +void ax25_std_establish_data_link(ax25_cb *); +void ax25_std_transmit_enquiry(ax25_cb *); +void ax25_std_enquiry_response(ax25_cb *); +void ax25_std_timeout_response(ax25_cb *); + +/* ax25_std_timer.c */ +void ax25_std_heartbeat_expiry(ax25_cb *); +void ax25_std_t1timer_expiry(ax25_cb *); +void ax25_std_t2timer_expiry(ax25_cb *); +void ax25_std_t3timer_expiry(ax25_cb *); +void ax25_std_idletimer_expiry(ax25_cb *); + +/* ax25_subr.c */ +void ax25_clear_queues(ax25_cb *); +void ax25_frames_acked(ax25_cb *, unsigned short); +void ax25_requeue_frames(ax25_cb *); +int ax25_validate_nr(ax25_cb *, unsigned short); +int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); +void ax25_send_control(ax25_cb *, int, int, int); +void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, + ax25_digi *); +void ax25_calculate_t1(ax25_cb *); +void ax25_calculate_rtt(ax25_cb *); +void ax25_disconnect(ax25_cb *, int); + +/* ax25_timer.c */ +void ax25_setup_timers(ax25_cb *); +void ax25_start_heartbeat(ax25_cb *); +void ax25_start_t1timer(ax25_cb *); +void ax25_start_t2timer(ax25_cb *); +void ax25_start_t3timer(ax25_cb *); +void ax25_start_idletimer(ax25_cb *); +void ax25_stop_heartbeat(ax25_cb *); +void ax25_stop_t1timer(ax25_cb *); +void ax25_stop_t2timer(ax25_cb *); +void ax25_stop_t3timer(ax25_cb *); +void ax25_stop_idletimer(ax25_cb *); +int ax25_t1timer_running(ax25_cb *); +unsigned long ax25_display_timer(struct timer_list *); + +/* ax25_uid.c */ +extern int ax25_uid_policy; +ax25_uid_assoc *ax25_findbyuid(kuid_t); +int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *); +extern const struct seq_operations ax25_uid_seqops; +void ax25_uid_free(void); + +/* sysctl_net_ax25.c */ +#ifdef CONFIG_SYSCTL +int ax25_register_dev_sysctl(ax25_dev *ax25_dev); +void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev); +#else +static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; } +static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {} +#endif /* CONFIG_SYSCTL */ + +#endif |