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. */ 60 enum { 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 }; 67 68 enum { 69 X25_LINK_STATE_0, 70 X25_LINK_STATE_1, 71 X25_LINK_STATE_2, 72 X25_LINK_STATE_3 73 }; 74 75 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */ 76 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */ 77 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */ 78 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */ 79 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */ 80 81 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */ 82 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */ 83 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */ 84 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */ 85 86 #define X25_SMODULUS 8 87 #define X25_EMODULUS 128 88 89 /* 90 * X.25 Facilities constants. 91 */ 92 93 #define X25_FAC_CLASS_MASK 0xC0 94 95 #define X25_FAC_CLASS_A 0x00 96 #define X25_FAC_CLASS_B 0x40 97 #define X25_FAC_CLASS_C 0x80 98 #define X25_FAC_CLASS_D 0xC0 99 100 #define X25_FAC_REVERSE 0x01 /* also fast select */ 101 #define X25_FAC_THROUGHPUT 0x02 102 #define X25_FAC_PACKET_SIZE 0x42 103 #define X25_FAC_WINDOW_SIZE 0x43 104 105 #define X25_MAX_FAC_LEN 60 106 #define X25_MAX_CUD_LEN 128 107 108 #define X25_FAC_CALLING_AE 0xCB 109 #define X25_FAC_CALLED_AE 0xC9 110 111 #define X25_MARKER 0x00 112 #define X25_DTE_SERVICES 0x0F 113 #define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */ 114 #define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */ 115 116 /* Bitset in x25_sock->flags for misc flags */ 117 #define X25_Q_BIT_FLAG 0 118 #define X25_INTERRUPT_FLAG 1 119 #define X25_ACCPT_APPRV_FLAG 2 120 121 /** 122 * struct x25_route - x25 routing entry 123 * @node - entry in x25_list_lock 124 * @address - Start of address range 125 * @sigdigits - Number of sig digits 126 * @dev - More than one for MLP 127 * @refcnt - reference counter 128 */ 129 struct x25_route { 130 struct list_head node; 131 struct x25_address address; 132 unsigned int sigdigits; 133 struct net_device *dev; 134 refcount_t refcnt; 135 }; 136 137 struct x25_neigh { 138 struct list_head node; 139 struct net_device *dev; 140 unsigned int state; 141 unsigned int extended; 142 struct sk_buff_head queue; 143 unsigned long t20; 144 struct timer_list t20timer; 145 unsigned long global_facil_mask; 146 refcount_t refcnt; 147 }; 148 149 struct x25_sock { 150 struct sock sk; 151 struct x25_address source_addr, dest_addr; 152 struct x25_neigh *neighbour; 153 unsigned int lci, cudmatchlength; 154 unsigned char state, condition; 155 unsigned short vs, vr, va, vl; 156 unsigned long t2, t21, t22, t23; 157 unsigned short fraglen; 158 unsigned long flags; 159 struct sk_buff_head ack_queue; 160 struct sk_buff_head fragment_queue; 161 struct sk_buff_head interrupt_in_queue; 162 struct sk_buff_head interrupt_out_queue; 163 struct timer_list timer; 164 struct x25_causediag causediag; 165 struct x25_facilities facilities; 166 struct x25_dte_facilities dte_facilities; 167 struct x25_calluserdata calluserdata; 168 unsigned long vc_facil_mask; /* inc_call facilities mask */ 169 }; 170 171 struct x25_forward { 172 struct list_head node; 173 unsigned int lci; 174 struct net_device *dev1; 175 struct net_device *dev2; 176 atomic_t refcnt; 177 }; 178 179 static inline struct x25_sock *x25_sk(const struct sock *sk) 180 { 181 return (struct x25_sock *)sk; 182 } 183 184 /* af_x25.c */ 185 extern int sysctl_x25_restart_request_timeout; 186 extern int sysctl_x25_call_request_timeout; 187 extern int sysctl_x25_reset_request_timeout; 188 extern int sysctl_x25_clear_request_timeout; 189 extern int sysctl_x25_ack_holdback_timeout; 190 extern int sysctl_x25_forward; 191 192 int x25_parse_address_block(struct sk_buff *skb, 193 struct x25_address *called_addr, 194 struct x25_address *calling_addr); 195 196 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *); 197 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *); 198 struct sock *x25_find_socket(unsigned int, struct x25_neigh *); 199 void x25_destroy_socket_from_timer(struct sock *); 200 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int); 201 void x25_kill_by_neigh(struct x25_neigh *); 202 203 /* x25_dev.c */ 204 void x25_send_frame(struct sk_buff *, struct x25_neigh *); 205 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, 206 struct packet_type *, struct net_device *); 207 void x25_establish_link(struct x25_neigh *); 208 void x25_terminate_link(struct x25_neigh *); 209 210 /* x25_facilities.c */ 211 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, 212 struct x25_dte_facilities *, unsigned long *); 213 int x25_create_facilities(unsigned char *, struct x25_facilities *, 214 struct x25_dte_facilities *, unsigned long); 215 int x25_negotiate_facilities(struct sk_buff *, struct sock *, 216 struct x25_facilities *, 217 struct x25_dte_facilities *); 218 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); 219 220 /* x25_forward.c */ 221 void x25_clear_forward_by_lci(unsigned int lci); 222 void x25_clear_forward_by_dev(struct net_device *); 223 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *); 224 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *, 225 int); 226 227 /* x25_in.c */ 228 int x25_process_rx_frame(struct sock *, struct sk_buff *); 229 int x25_backlog_rcv(struct sock *, struct sk_buff *); 230 231 /* x25_link.c */ 232 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); 233 void x25_link_device_up(struct net_device *); 234 void x25_link_device_down(struct net_device *); 235 void x25_link_established(struct x25_neigh *); 236 void x25_link_terminated(struct x25_neigh *); 237 void x25_transmit_clear_request(struct x25_neigh *, unsigned int, 238 unsigned char); 239 void x25_transmit_link(struct sk_buff *, struct x25_neigh *); 240 int x25_subscr_ioctl(unsigned int, void __user *); 241 struct x25_neigh *x25_get_neigh(struct net_device *); 242 void x25_link_free(void); 243 244 /* x25_neigh.c */ 245 static __inline__ void x25_neigh_hold(struct x25_neigh *nb) 246 { 247 refcount_inc(&nb->refcnt); 248 } 249 250 static __inline__ void x25_neigh_put(struct x25_neigh *nb) 251 { 252 if (refcount_dec_and_test(&nb->refcnt)) 253 kfree(nb); 254 } 255 256 /* x25_out.c */ 257 int x25_output(struct sock *, struct sk_buff *); 258 void x25_kick(struct sock *); 259 void x25_enquiry_response(struct sock *); 260 261 /* x25_route.c */ 262 struct x25_route *x25_get_route(struct x25_address *addr); 263 struct net_device *x25_dev_get(char *); 264 void x25_route_device_down(struct net_device *dev); 265 int x25_route_ioctl(unsigned int, void __user *); 266 void x25_route_free(void); 267 268 static __inline__ void x25_route_hold(struct x25_route *rt) 269 { 270 refcount_inc(&rt->refcnt); 271 } 272 273 static __inline__ void x25_route_put(struct x25_route *rt) 274 { 275 if (refcount_dec_and_test(&rt->refcnt)) 276 kfree(rt); 277 } 278 279 /* x25_subr.c */ 280 void x25_clear_queues(struct sock *); 281 void x25_frames_acked(struct sock *, unsigned short); 282 void x25_requeue_frames(struct sock *); 283 int x25_validate_nr(struct sock *, unsigned short); 284 void x25_write_internal(struct sock *, int); 285 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, 286 int *); 287 void x25_disconnect(struct sock *, int, unsigned char, unsigned char); 288 289 /* x25_timer.c */ 290 void x25_init_timers(struct sock *sk); 291 void x25_start_heartbeat(struct sock *); 292 void x25_start_t2timer(struct sock *); 293 void x25_start_t21timer(struct sock *); 294 void x25_start_t22timer(struct sock *); 295 void x25_start_t23timer(struct sock *); 296 void x25_stop_heartbeat(struct sock *); 297 void x25_stop_timer(struct sock *); 298 unsigned long x25_display_timer(struct sock *); 299 void x25_check_rbuf(struct sock *); 300 301 /* sysctl_net_x25.c */ 302 #ifdef CONFIG_SYSCTL 303 int x25_register_sysctl(void); 304 void x25_unregister_sysctl(void); 305 #else 306 static inline int x25_register_sysctl(void) { return 0; }; 307 static inline void x25_unregister_sysctl(void) {}; 308 #endif /* CONFIG_SYSCTL */ 309 310 struct x25_skb_cb { 311 unsigned int flags; 312 }; 313 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb)) 314 315 extern struct hlist_head x25_list; 316 extern rwlock_t x25_list_lock; 317 extern struct list_head x25_route_list; 318 extern rwlock_t x25_route_list_lock; 319 extern struct list_head x25_forward_list; 320 extern rwlock_t x25_forward_list_lock; 321 extern struct list_head x25_neigh_list; 322 extern rwlock_t x25_neigh_list_lock; 323 324 int x25_proc_init(void); 325 void x25_proc_exit(void); 326 #endif 327