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 X25_STATE_5 /* Call Accepted / Call Connected pending */ 67 }; 68 69 enum { 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 /* Default 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 */ 130 struct 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 }; 137 138 struct 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 }; 149 150 struct 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 }; 171 172 struct 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 */ 183 extern int sysctl_x25_restart_request_timeout; 184 extern int sysctl_x25_call_request_timeout; 185 extern int sysctl_x25_reset_request_timeout; 186 extern int sysctl_x25_clear_request_timeout; 187 extern int sysctl_x25_ack_holdback_timeout; 188 extern int sysctl_x25_forward; 189 190 int x25_parse_address_block(struct sk_buff *skb, 191 struct x25_address *called_addr, 192 struct x25_address *calling_addr); 193 194 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *); 195 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *); 196 struct sock *x25_find_socket(unsigned int, struct x25_neigh *); 197 void x25_destroy_socket_from_timer(struct sock *); 198 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int); 199 void x25_kill_by_neigh(struct x25_neigh *); 200 201 /* x25_dev.c */ 202 void x25_send_frame(struct sk_buff *, struct x25_neigh *); 203 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, 204 struct packet_type *, struct net_device *); 205 void x25_establish_link(struct x25_neigh *); 206 void x25_terminate_link(struct x25_neigh *); 207 208 /* x25_facilities.c */ 209 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, 210 struct x25_dte_facilities *, unsigned long *); 211 int x25_create_facilities(unsigned char *, struct x25_facilities *, 212 struct x25_dte_facilities *, unsigned long); 213 int x25_negotiate_facilities(struct sk_buff *, struct sock *, 214 struct x25_facilities *, 215 struct x25_dte_facilities *); 216 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); 217 218 /* x25_forward.c */ 219 void x25_clear_forward_by_lci(unsigned int lci); 220 void x25_clear_forward_by_dev(struct net_device *); 221 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *); 222 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *, 223 int); 224 225 /* x25_in.c */ 226 int x25_process_rx_frame(struct sock *, struct sk_buff *); 227 int x25_backlog_rcv(struct sock *, struct sk_buff *); 228 229 /* x25_link.c */ 230 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); 231 void x25_link_device_up(struct net_device *); 232 void x25_link_device_down(struct net_device *); 233 void x25_link_established(struct x25_neigh *); 234 void x25_link_terminated(struct x25_neigh *); 235 void x25_transmit_clear_request(struct x25_neigh *, unsigned int, 236 unsigned char); 237 void x25_transmit_link(struct sk_buff *, struct x25_neigh *); 238 int x25_subscr_ioctl(unsigned int, void __user *); 239 struct x25_neigh *x25_get_neigh(struct net_device *); 240 void x25_link_free(void); 241 242 /* x25_neigh.c */ x25_neigh_hold(struct x25_neigh * nb)243 static __inline__ void x25_neigh_hold(struct x25_neigh *nb) 244 { 245 refcount_inc(&nb->refcnt); 246 } 247 x25_neigh_put(struct x25_neigh * nb)248 static __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 */ 255 int x25_output(struct sock *, struct sk_buff *); 256 void x25_kick(struct sock *); 257 void x25_enquiry_response(struct sock *); 258 259 /* x25_route.c */ 260 struct x25_route *x25_get_route(struct x25_address *addr); 261 struct net_device *x25_dev_get(char *); 262 void x25_route_device_down(struct net_device *dev); 263 int x25_route_ioctl(unsigned int, void __user *); 264 void x25_route_free(void); 265 x25_route_hold(struct x25_route * rt)266 static __inline__ void x25_route_hold(struct x25_route *rt) 267 { 268 refcount_inc(&rt->refcnt); 269 } 270 x25_route_put(struct x25_route * rt)271 static __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 */ 278 void x25_clear_queues(struct sock *); 279 void x25_frames_acked(struct sock *, unsigned short); 280 void x25_requeue_frames(struct sock *); 281 int x25_validate_nr(struct sock *, unsigned short); 282 void x25_write_internal(struct sock *, int); 283 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, 284 int *); 285 void x25_disconnect(struct sock *, int, unsigned char, unsigned char); 286 287 /* x25_timer.c */ 288 void x25_init_timers(struct sock *sk); 289 void x25_start_heartbeat(struct sock *); 290 void x25_start_t2timer(struct sock *); 291 void x25_start_t21timer(struct sock *); 292 void x25_start_t22timer(struct sock *); 293 void x25_start_t23timer(struct sock *); 294 void x25_stop_heartbeat(struct sock *); 295 void x25_stop_timer(struct sock *); 296 unsigned long x25_display_timer(struct sock *); 297 void x25_check_rbuf(struct sock *); 298 299 /* sysctl_net_x25.c */ 300 #ifdef CONFIG_SYSCTL 301 int x25_register_sysctl(void); 302 void x25_unregister_sysctl(void); 303 #else x25_register_sysctl(void)304 static inline int x25_register_sysctl(void) { return 0; }; x25_unregister_sysctl(void)305 static inline void x25_unregister_sysctl(void) {}; 306 #endif /* CONFIG_SYSCTL */ 307 308 struct x25_skb_cb { 309 unsigned int flags; 310 }; 311 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb)) 312 313 extern struct hlist_head x25_list; 314 extern rwlock_t x25_list_lock; 315 extern struct list_head x25_route_list; 316 extern rwlock_t x25_route_list_lock; 317 extern struct list_head x25_forward_list; 318 extern rwlock_t x25_forward_list_lock; 319 extern struct list_head x25_neigh_list; 320 extern rwlock_t x25_neigh_list_lock; 321 322 int x25_proc_init(void); 323 void x25_proc_exit(void); 324 #endif 325