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/* SPDX-License-Identifier: GPL-2.0 */
/*
 *	Declarations of X.25 Packet Layer type objects.
 *
 * 	History
 *	nov/17/96	Jonathan Naylor	  Initial version.		
 *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities 
 *					  negotiation.
 */

#ifndef _X25_H
#define _X25_H 
#include <linux/x25.h>
#include <linux/slab.h>
#include <linux/refcount.h>
#include <net/sock.h>

#define	X25_ADDR_LEN			16

#define	X25_MAX_L2_LEN			18	/* 802.2 LLC */

#define	X25_STD_MIN_LEN			3
#define	X25_EXT_MIN_LEN			4

#define	X25_GFI_SEQ_MASK		0x30
#define	X25_GFI_STDSEQ			0x10
#define	X25_GFI_EXTSEQ			0x20

#define	X25_Q_BIT			0x80
#define	X25_D_BIT			0x40
#define	X25_STD_M_BIT			0x10
#define	X25_EXT_M_BIT			0x01

#define	X25_CALL_REQUEST		0x0B
#define	X25_CALL_ACCEPTED		0x0F
#define	X25_CLEAR_REQUEST		0x13
#define	X25_CLEAR_CONFIRMATION		0x17
#define	X25_DATA			0x00
#define	X25_INTERRUPT			0x23
#define	X25_INTERRUPT_CONFIRMATION	0x27
#define	X25_RR				0x01
#define	X25_RNR				0x05
#define	X25_REJ				0x09
#define	X25_RESET_REQUEST		0x1B
#define	X25_RESET_CONFIRMATION		0x1F
#define	X25_REGISTRATION_REQUEST	0xF3
#define	X25_REGISTRATION_CONFIRMATION	0xF7
#define	X25_RESTART_REQUEST		0xFB
#define	X25_RESTART_CONFIRMATION	0xFF
#define	X25_DIAGNOSTIC			0xF1
#define	X25_ILLEGAL			0xFD

/* Define the various conditions that may exist */

#define	X25_COND_ACK_PENDING	0x01
#define	X25_COND_OWN_RX_BUSY	0x02
#define	X25_COND_PEER_RX_BUSY	0x04

/* Define Link State constants. */
enum {
	X25_STATE_0,		/* Ready */
	X25_STATE_1,		/* Awaiting Call Accepted */
	X25_STATE_2,		/* Awaiting Clear Confirmation */
	X25_STATE_3,		/* Data Transfer */
	X25_STATE_4		/* Awaiting Reset Confirmation */
};

enum {
	X25_LINK_STATE_0,
	X25_LINK_STATE_1,
	X25_LINK_STATE_2,
	X25_LINK_STATE_3
};

#define X25_DEFAULT_T20		(180 * HZ)		/* Default T20 value */
#define X25_DEFAULT_T21		(200 * HZ)		/* Default T21 value */
#define X25_DEFAULT_T22		(180 * HZ)		/* Default T22 value */
#define	X25_DEFAULT_T23		(180 * HZ)		/* Default T23 value */
#define	X25_DEFAULT_T2		(3   * HZ)		/* Default ack holdback value */

#define	X25_DEFAULT_WINDOW_SIZE	2			/* Default Window Size	*/
#define	X25_DEFAULT_PACKET_SIZE	X25_PS128		/* Default Packet Size */
#define	X25_DEFAULT_THROUGHPUT	0x0A			/* Deafult Throughput */
#define	X25_DEFAULT_REVERSE	0x00			/* Default Reverse Charging */

#define X25_SMODULUS 		8
#define	X25_EMODULUS		128

/*
 *	X.25 Facilities constants.
 */

#define	X25_FAC_CLASS_MASK	0xC0

#define	X25_FAC_CLASS_A		0x00
#define	X25_FAC_CLASS_B		0x40
#define	X25_FAC_CLASS_C		0x80
#define	X25_FAC_CLASS_D		0xC0

#define	X25_FAC_REVERSE		0x01			/* also fast select */
#define	X25_FAC_THROUGHPUT	0x02
#define	X25_FAC_PACKET_SIZE	0x42
#define	X25_FAC_WINDOW_SIZE	0x43

#define X25_MAX_FAC_LEN 	60
#define	X25_MAX_CUD_LEN		128

#define X25_FAC_CALLING_AE 	0xCB
#define X25_FAC_CALLED_AE 	0xC9

#define X25_MARKER 		0x00
#define X25_DTE_SERVICES 	0x0F
#define X25_MAX_AE_LEN 		40			/* Max num of semi-octets in AE - OSI Nw */
#define X25_MAX_DTE_FACIL_LEN	21			/* Max length of DTE facility params */

/* Bitset in x25_sock->flags for misc flags */
#define X25_Q_BIT_FLAG		0
#define X25_INTERRUPT_FLAG	1
#define X25_ACCPT_APPRV_FLAG	2

/**
 *	struct x25_route - x25 routing entry
 *	@node - entry in x25_list_lock
 *	@address - Start of address range
 *	@sigdigits - Number of sig digits
 *	@dev - More than one for MLP
 *	@refcnt - reference counter
 */
struct x25_route {
	struct list_head	node;		
	struct x25_address	address;
	unsigned int		sigdigits;
	struct net_device	*dev;
	refcount_t		refcnt;
};

struct x25_neigh {
	struct list_head	node;
	struct net_device	*dev;
	unsigned int		state;
	unsigned int		extended;
	struct sk_buff_head	queue;
	unsigned long		t20;
	struct timer_list	t20timer;
	unsigned long		global_facil_mask;
	refcount_t		refcnt;
};

struct x25_sock {
	struct sock		sk;
	struct x25_address	source_addr, dest_addr;
	struct x25_neigh	*neighbour;
	unsigned int		lci, cudmatchlength;
	unsigned char		state, condition;
	unsigned short		vs, vr, va, vl;
	unsigned long		t2, t21, t22, t23;
	unsigned short		fraglen;
	unsigned long		flags;
	struct sk_buff_head	ack_queue;
	struct sk_buff_head	fragment_queue;
	struct sk_buff_head	interrupt_in_queue;
	struct sk_buff_head	interrupt_out_queue;
	struct timer_list	timer;
	struct x25_causediag	causediag;
	struct x25_facilities	facilities;
	struct x25_dte_facilities dte_facilities;
	struct x25_calluserdata	calluserdata;
	unsigned long 		vc_facil_mask;	/* inc_call facilities mask */
};

struct x25_forward {
	struct list_head	node;
	unsigned int		lci;
	struct net_device	*dev1;
	struct net_device	*dev2;
	atomic_t		refcnt;
};

static inline struct x25_sock *x25_sk(const struct sock *sk)
{
	return (struct x25_sock *)sk;
}

/* af_x25.c */
extern int  sysctl_x25_restart_request_timeout;
extern int  sysctl_x25_call_request_timeout;
extern int  sysctl_x25_reset_request_timeout;
extern int  sysctl_x25_clear_request_timeout;
extern int  sysctl_x25_ack_holdback_timeout;
extern int  sysctl_x25_forward;

int x25_parse_address_block(struct sk_buff *skb,
			    struct x25_address *called_addr,
			    struct x25_address *calling_addr);

int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
void x25_destroy_socket_from_timer(struct sock *);
int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
void x25_kill_by_neigh(struct x25_neigh *);

/* x25_dev.c */
void x25_send_frame(struct sk_buff *, struct x25_neigh *);
int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
			   struct packet_type *, struct net_device *);
void x25_establish_link(struct x25_neigh *);
void x25_terminate_link(struct x25_neigh *);

/* x25_facilities.c */
int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
			 struct x25_dte_facilities *, unsigned long *);
int x25_create_facilities(unsigned char *, struct x25_facilities *,
			  struct x25_dte_facilities *, unsigned long);
int x25_negotiate_facilities(struct sk_buff *, struct sock *,
			     struct x25_facilities *,
			     struct x25_dte_facilities *);
void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);

/* x25_forward.c */
void x25_clear_forward_by_lci(unsigned int lci);
void x25_clear_forward_by_dev(struct net_device *);
int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
		     int);

/* x25_in.c */
int x25_process_rx_frame(struct sock *, struct sk_buff *);
int x25_backlog_rcv(struct sock *, struct sk_buff *);

/* x25_link.c */
void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
void x25_link_device_up(struct net_device *);
void x25_link_device_down(struct net_device *);
void x25_link_established(struct x25_neigh *);
void x25_link_terminated(struct x25_neigh *);
void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
				unsigned char);
void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
int x25_subscr_ioctl(unsigned int, void __user *);
struct x25_neigh *x25_get_neigh(struct net_device *);
void x25_link_free(void);

/* x25_neigh.c */
static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
{
	refcount_inc(&nb->refcnt);
}

static __inline__ void x25_neigh_put(struct x25_neigh *nb)
{
	if (refcount_dec_and_test(&nb->refcnt))
		kfree(nb);
}

/* x25_out.c */
int x25_output(struct sock *, struct sk_buff *);
void x25_kick(struct sock *);
void x25_enquiry_response(struct sock *);

/* x25_route.c */
struct x25_route *x25_get_route(struct x25_address *addr);
struct net_device *x25_dev_get(char *);
void x25_route_device_down(struct net_device *dev);
int x25_route_ioctl(unsigned int, void __user *);
void x25_route_free(void);

static __inline__ void x25_route_hold(struct x25_route *rt)
{
	refcount_inc(&rt->refcnt);
}

static __inline__ void x25_route_put(struct x25_route *rt)
{
	if (refcount_dec_and_test(&rt->refcnt))
		kfree(rt);
}

/* x25_subr.c */
void x25_clear_queues(struct sock *);
void x25_frames_acked(struct sock *, unsigned short);
void x25_requeue_frames(struct sock *);
int x25_validate_nr(struct sock *, unsigned short);
void x25_write_internal(struct sock *, int);
int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
	       int *);
void x25_disconnect(struct sock *, int, unsigned char, unsigned char);

/* x25_timer.c */
void x25_init_timers(struct sock *sk);
void x25_start_heartbeat(struct sock *);
void x25_start_t2timer(struct sock *);
void x25_start_t21timer(struct sock *);
void x25_start_t22timer(struct sock *);
void x25_start_t23timer(struct sock *);
void x25_stop_heartbeat(struct sock *);
void x25_stop_timer(struct sock *);
unsigned long x25_display_timer(struct sock *);
void x25_check_rbuf(struct sock *);

/* sysctl_net_x25.c */
#ifdef CONFIG_SYSCTL
int x25_register_sysctl(void);
void x25_unregister_sysctl(void);
#else
static inline int x25_register_sysctl(void) { return 0; };
static inline void x25_unregister_sysctl(void) {};
#endif /* CONFIG_SYSCTL */

struct x25_skb_cb {
	unsigned int flags;
};
#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))

extern struct hlist_head x25_list;
extern rwlock_t x25_list_lock;
extern struct list_head x25_route_list;
extern rwlock_t x25_route_list_lock;
extern struct list_head x25_forward_list;
extern rwlock_t x25_forward_list_lock;
extern struct list_head x25_neigh_list;
extern rwlock_t x25_neigh_list_lock;

int x25_proc_init(void);
void x25_proc_exit(void);
#endif

Filemanager

Name Type Size Permission Actions
9p Folder 0755
bluetooth Folder 0755
caif Folder 0755
iucv Folder 0755
netfilter Folder 0755
netns Folder 0755
nfc Folder 0755
phonet Folder 0755
sctp Folder 0755
tc_act Folder 0755
6lowpan.h File 10.03 KB 0644
Space.h File 1.15 KB 0644
act_api.h File 6.38 KB 0644
addrconf.h File 12.63 KB 0644
af_ieee802154.h File 1.55 KB 0644
af_rxrpc.h File 2.79 KB 0644
af_unix.h File 2.22 KB 0644
af_vsock.h File 7.21 KB 0644
ah.h File 382 B 0644
arp.h File 2 KB 0644
atmclip.h File 1.48 KB 0644
ax25.h File 15.02 KB 0644
ax88796.h File 998 B 0644
bond_3ad.h File 9.79 KB 0644
bond_alb.h File 6.6 KB 0644
bond_options.h File 3.92 KB 0644
bonding.h File 19.1 KB 0644
busy_poll.h File 3.8 KB 0644
calipso.h File 2.15 KB 0644
cfg80211-wext.h File 1.95 KB 0644
cfg80211.h File 221.24 KB 0644
cfg802154.h File 10.89 KB 0644
checksum.h File 4.76 KB 0644
cipso_ipv4.h File 8.2 KB 0644
cls_cgroup.h File 2.15 KB 0644
codel.h File 5.65 KB 0644
codel_impl.h File 7.98 KB 0644
codel_qdisc.h File 2.9 KB 0644
compat.h File 2.11 KB 0644
datalink.h File 619 B 0644
dcbevent.h File 1.26 KB 0644
dcbnl.h File 4.2 KB 0644
devlink.h File 13.25 KB 0644
dn.h File 6.88 KB 0644
dn_dev.h File 5.36 KB 0644
dn_fib.h File 3.98 KB 0644
dn_neigh.h File 968 B 0644
dn_nsp.h File 5.83 KB 0644
dn_route.h File 4.36 KB 0644
dsa.h File 13.94 KB 0644
dsfield.h File 1.11 KB 0644
dst.h File 13.48 KB 0644
dst_cache.h File 2.53 KB 0644
dst_metadata.h File 5.39 KB 0644
dst_ops.h File 2 KB 0644
erspan.h File 2.11 KB 0644
esp.h File 877 B 0644
ethoc.h File 538 B 0644
fib_notifier.h File 1.29 KB 0644
fib_rules.h File 4.18 KB 0644
firewire.h File 636 B 0644
flow.h File 6.16 KB 0644
flow_dissector.h File 7.55 KB 0644
fou.h File 549 B 0644
fq.h File 2.67 KB 0644
fq_impl.h File 6.9 KB 0644
garp.h File 2.62 KB 0644
gen_stats.h File 2.34 KB 0644
genetlink.h File 11.3 KB 0644
geneve.h File 1.67 KB 0644
gre.h File 2.99 KB 0644
gro_cells.h File 443 B 0644
gtp.h File 633 B 0644
gue.h File 3.23 KB 0644
hwbm.h File 937 B 0644
icmp.h File 2.01 KB 0644
ieee80211_radiotap.h File 6.63 KB 0644
ieee802154_netdev.h File 9.14 KB 0644
if_inet6.h File 6.13 KB 0644
ife.h File 1.06 KB 0644
ila.h File 498 B 0644
inet6_connection_sock.h File 976 B 0644
inet6_hashtables.h File 3.7 KB 0644
inet_common.h File 1.89 KB 0644
inet_connection_sock.h File 10.48 KB 0644
inet_ecn.h File 6.02 KB 0644
inet_frag.h File 4.51 KB 0644
inet_hashtables.h File 12.91 KB 0644
inet_sock.h File 8.25 KB 0644
inet_timewait_sock.h File 3.82 KB 0644
inetpeer.h File 3.29 KB 0644
ip.h File 18.51 KB 0644
ip6_checksum.h File 2.89 KB 0644
ip6_fib.h File 10.04 KB 0644
ip6_route.h File 7.63 KB 0644
ip6_tunnel.h File 4.72 KB 0644
ip_fib.h File 10.72 KB 0644
ip_tunnels.h File 13.61 KB 0644
ip_vs.h File 46.78 KB 0644
ipcomp.h File 659 B 0644
ipconfig.h File 811 B 0644
ipv6.h File 29.97 KB 0644
ipv6_frag.h File 2.54 KB 0644
ipx.h File 4.4 KB 0644
iw_handler.h File 20.91 KB 0644
kcm.h File 4.96 KB 0644
l3mdev.h File 5.86 KB 0644
lapb.h File 4.75 KB 0644
lib80211.h File 3.92 KB 0644
llc.h File 4.41 KB 0644
llc_c_ac.h File 9.31 KB 0644
llc_c_ev.h File 10.68 KB 0644
llc_c_st.h File 1.72 KB 0644
llc_conn.h File 4.06 KB 0644
llc_if.h File 2.16 KB 0644
llc_pdu.h File 14.44 KB 0644
llc_s_ac.h File 1.55 KB 0644
llc_s_ev.h File 2.2 KB 0644
llc_s_st.h File 947 B 0644
llc_sap.h File 1.08 KB 0644
lwtunnel.h File 5.84 KB 0644
mac80211.h File 230.36 KB 0644
mac802154.h File 15.27 KB 0644
mip6.h File 1.58 KB 0644
mld.h File 2.8 KB 0644
mpls.h File 932 B 0644
mpls_iptunnel.h File 827 B 0644
mrp.h File 3.03 KB 0644
ncsi.h File 1.92 KB 0644
ndisc.h File 13.77 KB 0644
neighbour.h File 15.06 KB 0644
net_namespace.h File 10.08 KB 0644
net_ratelimit.h File 220 B 0644
netevent.h File 910 B 0644
netlabel.h File 20.74 KB 0644
netlink.h File 40.39 KB 0644
netprio_cgroup.h File 1.24 KB 0644
netrom.h File 7.68 KB 0644
nexthop.h File 865 B 0644
nl802154.h File 12.09 KB 0644
nsh.h File 12.31 KB 0644
p8022.h File 447 B 0644
ping.h File 3.45 KB 0644
pkt_cls.h File 17.34 KB 0644
pkt_sched.h File 4.05 KB 0644
pptp.h File 557 B 0644
protocol.h File 4.08 KB 0644
psample.h File 860 B 0644
psnap.h File 351 B 0644
raw.h File 2.07 KB 0644
rawv6.h File 854 B 0644
red.h File 10.45 KB 0644
regulatory.h File 10.12 KB 0644
request_sock.h File 6.46 KB 0644
rose.h File 7.62 KB 0644
route.h File 10.02 KB 0644
rtnetlink.h File 6.13 KB 0644
sch_generic.h File 23.3 KB 0644
scm.h File 3.5 KB 0644
secure_seq.h File 855 B 0644
seg6.h File 1.66 KB 0644
seg6_hmac.h File 1.65 KB 0644
slhc_vj.h File 6.67 KB 0644
smc.h File 440 B 0644
snmp.h File 5.23 KB 0644
sock.h File 69.75 KB 0644
sock_reuseport.h File 863 B 0644
stp.h File 383 B 0644
strparser.h File 3.75 KB 0644
switchdev.h File 6.52 KB 0644
tcp.h File 62.8 KB 0644
tcp_states.h File 1.26 KB 0644
timewait_sock.h File 1.11 KB 0644
tipc.h File 2.34 KB 0644
tls.h File 7.12 KB 0644
transp_v6.h File 2.08 KB 0644
tso.h File 515 B 0644
tun_proto.h File 988 B 0644
udp.h File 12.82 KB 0644
udp_tunnel.h File 5.12 KB 0644
udplite.h File 3.83 KB 0644
vsock_addr.h File 1.05 KB 0644
vxlan.h File 10.43 KB 0644
wext.h File 1.51 KB 0644
wimax.h File 19.97 KB 0644
x25.h File 9.43 KB 0644
x25device.h File 387 B 0644
xfrm.h File 53.72 KB 0644