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/* 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 */ #ifdef CONFIG_AX25_DAMA_SLAVE AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ #endif 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 list_head list; 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; struct rcu_head rcu; } 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; }; #define ax25_sk(ptr) container_of_const(ptr, 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_rcu(ax25_dev, rcu); } 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 spinlock_t ax25_dev_lock; #if IS_ENABLED(CONFIG_AX25) static inline ax25_dev *ax25_dev_ax25dev(const struct net_device *dev) { return rcu_dereference_rtnl(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); 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