1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Declarations of X.25 Packet Layer type objects. 4 * 5 * History 6 * nov/17/96 Jonathan Naylor Initial version. 7 * mar/20/00 Daniela Squassoni Disabling/enabling of facilities 8 * negotiation. 9 */ 10 11#ifndef _X25_H 12#define _X25_H 13#include <linux/x25.h> 14#include <linux/slab.h> 15#include <linux/refcount.h> 16#include <net/sock.h> 17 18#define X25_ADDR_LEN 16 19 20#define X25_MAX_L2_LEN 18 /* 802.2 LLC */ 21 22#define X25_STD_MIN_LEN 3 23#define X25_EXT_MIN_LEN 4 24 25#define X25_GFI_SEQ_MASK 0x30 26#define X25_GFI_STDSEQ 0x10 27#define X25_GFI_EXTSEQ 0x20 28 29#define X25_Q_BIT 0x80 30#define X25_D_BIT 0x40 31#define X25_STD_M_BIT 0x10 32#define X25_EXT_M_BIT 0x01 33 34#define X25_CALL_REQUEST 0x0B 35#define X25_CALL_ACCEPTED 0x0F 36#define X25_CLEAR_REQUEST 0x13 37#define X25_CLEAR_CONFIRMATION 0x17 38#define X25_DATA 0x00 39#define X25_INTERRUPT 0x23 40#define X25_INTERRUPT_CONFIRMATION 0x27 41#define X25_RR 0x01 42#define X25_RNR 0x05 43#define X25_REJ 0x09 44#define X25_RESET_REQUEST 0x1B 45#define X25_RESET_CONFIRMATION 0x1F 46#define X25_REGISTRATION_REQUEST 0xF3 47#define X25_REGISTRATION_CONFIRMATION 0xF7 48#define X25_RESTART_REQUEST 0xFB 49#define X25_RESTART_CONFIRMATION 0xFF 50#define X25_DIAGNOSTIC 0xF1 51#define X25_ILLEGAL 0xFD 52 53/* Define the various conditions that may exist */ 54 55#define X25_COND_ACK_PENDING 0x01 56#define X25_COND_OWN_RX_BUSY 0x02 57#define X25_COND_PEER_RX_BUSY 0x04 58 59/* Define Link State constants. */ 60enum { 61 X25_STATE_0, /* Ready */ 62 X25_STATE_1, /* Awaiting Call Accepted */ 63 X25_STATE_2, /* Awaiting Clear Confirmation */ 64 X25_STATE_3, /* Data Transfer */ 65 X25_STATE_4, /* Awaiting Reset Confirmation */ 66 X25_STATE_5 /* Call Accepted / Call Connected pending */ 67}; 68 69enum { 70 X25_LINK_STATE_0, 71 X25_LINK_STATE_1, 72 X25_LINK_STATE_2, 73 X25_LINK_STATE_3 74}; 75 76#define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */ 77#define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */ 78#define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */ 79#define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */ 80#define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */ 81 82#define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */ 83#define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */ 84#define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */ 85#define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */ 86 87#define X25_SMODULUS 8 88#define X25_EMODULUS 128 89 90/* 91 * X.25 Facilities constants. 92 */ 93 94#define X25_FAC_CLASS_MASK 0xC0 95 96#define X25_FAC_CLASS_A 0x00 97#define X25_FAC_CLASS_B 0x40 98#define X25_FAC_CLASS_C 0x80 99#define X25_FAC_CLASS_D 0xC0 100 101#define X25_FAC_REVERSE 0x01 /* also fast select */ 102#define X25_FAC_THROUGHPUT 0x02 103#define X25_FAC_PACKET_SIZE 0x42 104#define X25_FAC_WINDOW_SIZE 0x43 105 106#define X25_MAX_FAC_LEN 60 107#define X25_MAX_CUD_LEN 128 108 109#define X25_FAC_CALLING_AE 0xCB 110#define X25_FAC_CALLED_AE 0xC9 111 112#define X25_MARKER 0x00 113#define X25_DTE_SERVICES 0x0F 114#define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */ 115#define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */ 116 117/* Bitset in x25_sock->flags for misc flags */ 118#define X25_Q_BIT_FLAG 0 119#define X25_INTERRUPT_FLAG 1 120#define X25_ACCPT_APPRV_FLAG 2 121 122/** 123 * struct x25_route - x25 routing entry 124 * @node - entry in x25_list_lock 125 * @address - Start of address range 126 * @sigdigits - Number of sig digits 127 * @dev - More than one for MLP 128 * @refcnt - reference counter 129 */ 130struct x25_route { 131 struct list_head node; 132 struct x25_address address; 133 unsigned int sigdigits; 134 struct net_device *dev; 135 refcount_t refcnt; 136}; 137 138struct x25_neigh { 139 struct list_head node; 140 struct net_device *dev; 141 unsigned int state; 142 unsigned int extended; 143 struct sk_buff_head queue; 144 unsigned long t20; 145 struct timer_list t20timer; 146 unsigned long global_facil_mask; 147 refcount_t refcnt; 148}; 149 150struct x25_sock { 151 struct sock sk; 152 struct x25_address source_addr, dest_addr; 153 struct x25_neigh *neighbour; 154 unsigned int lci, cudmatchlength; 155 unsigned char state, condition; 156 unsigned short vs, vr, va, vl; 157 unsigned long t2, t21, t22, t23; 158 unsigned short fraglen; 159 unsigned long flags; 160 struct sk_buff_head ack_queue; 161 struct sk_buff_head fragment_queue; 162 struct sk_buff_head interrupt_in_queue; 163 struct sk_buff_head interrupt_out_queue; 164 struct timer_list timer; 165 struct x25_causediag causediag; 166 struct x25_facilities facilities; 167 struct x25_dte_facilities dte_facilities; 168 struct x25_calluserdata calluserdata; 169 unsigned long vc_facil_mask; /* inc_call facilities mask */ 170}; 171 172struct x25_forward { 173 struct list_head node; 174 unsigned int lci; 175 struct net_device *dev1; 176 struct net_device *dev2; 177 atomic_t refcnt; 178}; 179 180#define x25_sk(ptr) container_of_const(ptr, struct x25_sock, sk) 181 182/* af_x25.c */ 183extern int sysctl_x25_restart_request_timeout; 184extern int sysctl_x25_call_request_timeout; 185extern int sysctl_x25_reset_request_timeout; 186extern int sysctl_x25_clear_request_timeout; 187extern int sysctl_x25_ack_holdback_timeout; 188extern int sysctl_x25_forward; 189 190int x25_parse_address_block(struct sk_buff *skb, 191 struct x25_address *called_addr, 192 struct x25_address *calling_addr); 193 194int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *); 195int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *); 196struct sock *x25_find_socket(unsigned int, struct x25_neigh *); 197void x25_destroy_socket_from_timer(struct sock *); 198int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int); 199void x25_kill_by_neigh(struct x25_neigh *); 200 201/* x25_dev.c */ 202void x25_send_frame(struct sk_buff *, struct x25_neigh *); 203int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, 204 struct packet_type *, struct net_device *); 205void x25_establish_link(struct x25_neigh *); 206void x25_terminate_link(struct x25_neigh *); 207 208/* x25_facilities.c */ 209int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, 210 struct x25_dte_facilities *, unsigned long *); 211int x25_create_facilities(unsigned char *, struct x25_facilities *, 212 struct x25_dte_facilities *, unsigned long); 213int x25_negotiate_facilities(struct sk_buff *, struct sock *, 214 struct x25_facilities *, 215 struct x25_dte_facilities *); 216void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); 217 218/* x25_forward.c */ 219void x25_clear_forward_by_lci(unsigned int lci); 220void x25_clear_forward_by_dev(struct net_device *); 221int x25_forward_data(int, struct x25_neigh *, struct sk_buff *); 222int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *, 223 int); 224 225/* x25_in.c */ 226int x25_process_rx_frame(struct sock *, struct sk_buff *); 227int x25_backlog_rcv(struct sock *, struct sk_buff *); 228 229/* x25_link.c */ 230void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); 231void x25_link_device_up(struct net_device *); 232void x25_link_device_down(struct net_device *); 233void x25_link_established(struct x25_neigh *); 234void x25_link_terminated(struct x25_neigh *); 235void x25_transmit_clear_request(struct x25_neigh *, unsigned int, 236 unsigned char); 237void x25_transmit_link(struct sk_buff *, struct x25_neigh *); 238int x25_subscr_ioctl(unsigned int, void __user *); 239struct x25_neigh *x25_get_neigh(struct net_device *); 240void x25_link_free(void); 241 242/* x25_neigh.c */ 243static __inline__ void x25_neigh_hold(struct x25_neigh *nb) 244{ 245 refcount_inc(&nb->refcnt); 246} 247 248static __inline__ void x25_neigh_put(struct x25_neigh *nb) 249{ 250 if (refcount_dec_and_test(&nb->refcnt)) 251 kfree(nb); 252} 253 254/* x25_out.c */ 255int x25_output(struct sock *, struct sk_buff *); 256void x25_kick(struct sock *); 257void x25_enquiry_response(struct sock *); 258 259/* x25_route.c */ 260struct x25_route *x25_get_route(struct x25_address *addr); 261struct net_device *x25_dev_get(char *); 262void x25_route_device_down(struct net_device *dev); 263int x25_route_ioctl(unsigned int, void __user *); 264void x25_route_free(void); 265 266static __inline__ void x25_route_hold(struct x25_route *rt) 267{ 268 refcount_inc(&rt->refcnt); 269} 270 271static __inline__ void x25_route_put(struct x25_route *rt) 272{ 273 if (refcount_dec_and_test(&rt->refcnt)) 274 kfree(rt); 275} 276 277/* x25_subr.c */ 278void x25_clear_queues(struct sock *); 279void x25_frames_acked(struct sock *, unsigned short); 280void x25_requeue_frames(struct sock *); 281int x25_validate_nr(struct sock *, unsigned short); 282void x25_write_internal(struct sock *, int); 283int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, 284 int *); 285void x25_disconnect(struct sock *, int, unsigned char, unsigned char); 286 287/* x25_timer.c */ 288void x25_init_timers(struct sock *sk); 289void x25_start_heartbeat(struct sock *); 290void x25_start_t2timer(struct sock *); 291void x25_start_t21timer(struct sock *); 292void x25_start_t22timer(struct sock *); 293void x25_start_t23timer(struct sock *); 294void x25_stop_heartbeat(struct sock *); 295void x25_stop_timer(struct sock *); 296unsigned long x25_display_timer(struct sock *); 297void x25_check_rbuf(struct sock *); 298 299/* sysctl_net_x25.c */ 300#ifdef CONFIG_SYSCTL 301int x25_register_sysctl(void); 302void x25_unregister_sysctl(void); 303#else 304static inline int x25_register_sysctl(void) { return 0; }; 305static inline void x25_unregister_sysctl(void) {}; 306#endif /* CONFIG_SYSCTL */ 307 308struct x25_skb_cb { 309 unsigned int flags; 310}; 311#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb)) 312 313extern struct hlist_head x25_list; 314extern rwlock_t x25_list_lock; 315extern struct list_head x25_route_list; 316extern rwlock_t x25_route_list_lock; 317extern struct list_head x25_forward_list; 318extern rwlock_t x25_forward_list_lock; 319extern struct list_head x25_neigh_list; 320extern rwlock_t x25_neigh_list_lock; 321 322int x25_proc_init(void); 323void x25_proc_exit(void); 324#endif 325