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linux/include/net/x25.h
Eric Dumazet c7154ca8e0 x25: preserve const qualifier in [a]x25_sk() 
We can change [a]x25_sk() to propagate their argument const qualifier,
thanks to container_of_const().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-03-18 12:23:34 +00:00

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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 */
X25_STATE_5 /* Call Accepted / Call Connected pending */
};
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;
};
#define x25_sk(ptr) container_of_const(ptr, 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
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