1 /* 2 * Declarations of X.25 Packet Layer type objects. 3 * 4 * History 5 * nov/17/96 Jonathan Naylor Initial version. 6 * mar/20/00 Daniela Squassoni Disabling/enabling of facilities 7 * negotiation. 8 */ 9 10 #ifndef _X25_H 11 #define _X25_H 12 #include <linux/x25.h> 13 #include <linux/slab.h> 14 #include <net/sock.h> 15 16 #define X25_ADDR_LEN 16 17 18 #define X25_MAX_L2_LEN 18 /* 802.2 LLC */ 19 20 #define X25_STD_MIN_LEN 3 21 #define X25_EXT_MIN_LEN 4 22 23 #define X25_GFI_SEQ_MASK 0x30 24 #define X25_GFI_STDSEQ 0x10 25 #define X25_GFI_EXTSEQ 0x20 26 27 #define X25_Q_BIT 0x80 28 #define X25_D_BIT 0x40 29 #define X25_STD_M_BIT 0x10 30 #define X25_EXT_M_BIT 0x01 31 32 #define X25_CALL_REQUEST 0x0B 33 #define X25_CALL_ACCEPTED 0x0F 34 #define X25_CLEAR_REQUEST 0x13 35 #define X25_CLEAR_CONFIRMATION 0x17 36 #define X25_DATA 0x00 37 #define X25_INTERRUPT 0x23 38 #define X25_INTERRUPT_CONFIRMATION 0x27 39 #define X25_RR 0x01 40 #define X25_RNR 0x05 41 #define X25_REJ 0x09 42 #define X25_RESET_REQUEST 0x1B 43 #define X25_RESET_CONFIRMATION 0x1F 44 #define X25_REGISTRATION_REQUEST 0xF3 45 #define X25_REGISTRATION_CONFIRMATION 0xF7 46 #define X25_RESTART_REQUEST 0xFB 47 #define X25_RESTART_CONFIRMATION 0xFF 48 #define X25_DIAGNOSTIC 0xF1 49 #define X25_ILLEGAL 0xFD 50 51 /* Define the various conditions that may exist */ 52 53 #define X25_COND_ACK_PENDING 0x01 54 #define X25_COND_OWN_RX_BUSY 0x02 55 #define X25_COND_PEER_RX_BUSY 0x04 56 57 /* Define Link State constants. */ 58 enum { 59 X25_STATE_0, /* Ready */ 60 X25_STATE_1, /* Awaiting Call Accepted */ 61 X25_STATE_2, /* Awaiting Clear Confirmation */ 62 X25_STATE_3, /* Data Transfer */ 63 X25_STATE_4 /* Awaiting Reset Confirmation */ 64 }; 65 66 enum { 67 X25_LINK_STATE_0, 68 X25_LINK_STATE_1, 69 X25_LINK_STATE_2, 70 X25_LINK_STATE_3 71 }; 72 73 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */ 74 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */ 75 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */ 76 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */ 77 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */ 78 79 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */ 80 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */ 81 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */ 82 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */ 83 #define X25_DENY_ACCPT_APPRV 0x01 /* Default value */ 84 #define X25_ALLOW_ACCPT_APPRV 0x00 /* Control enabled */ 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 /** 117 * struct x25_route - x25 routing entry 118 * @node - entry in x25_list_lock 119 * @address - Start of address range 120 * @sigdigits - Number of sig digits 121 * @dev - More than one for MLP 122 * @refcnt - reference counter 123 */ 124 struct x25_route { 125 struct list_head node; 126 struct x25_address address; 127 unsigned int sigdigits; 128 struct net_device *dev; 129 atomic_t refcnt; 130 }; 131 132 struct x25_neigh { 133 struct list_head node; 134 struct net_device *dev; 135 unsigned int state; 136 unsigned int extended; 137 struct sk_buff_head queue; 138 unsigned long t20; 139 struct timer_list t20timer; 140 unsigned long global_facil_mask; 141 atomic_t refcnt; 142 }; 143 144 struct x25_sock { 145 struct sock sk; 146 struct x25_address source_addr, dest_addr; 147 struct x25_neigh *neighbour; 148 unsigned int lci, cudmatchlength; 149 unsigned char state, condition, qbitincl, intflag, accptapprv; 150 unsigned short vs, vr, va, vl; 151 unsigned long t2, t21, t22, t23; 152 unsigned short fraglen; 153 struct sk_buff_head ack_queue; 154 struct sk_buff_head fragment_queue; 155 struct sk_buff_head interrupt_in_queue; 156 struct sk_buff_head interrupt_out_queue; 157 struct timer_list timer; 158 struct x25_causediag causediag; 159 struct x25_facilities facilities; 160 struct x25_dte_facilities dte_facilities; 161 struct x25_calluserdata calluserdata; 162 unsigned long vc_facil_mask; /* inc_call facilities mask */ 163 }; 164 165 struct x25_forward { 166 struct list_head node; 167 unsigned int lci; 168 struct net_device *dev1; 169 struct net_device *dev2; 170 atomic_t refcnt; 171 }; 172 173 static inline struct x25_sock *x25_sk(const struct sock *sk) 174 { 175 return (struct x25_sock *)sk; 176 } 177 178 /* af_x25.c */ 179 extern int sysctl_x25_restart_request_timeout; 180 extern int sysctl_x25_call_request_timeout; 181 extern int sysctl_x25_reset_request_timeout; 182 extern int sysctl_x25_clear_request_timeout; 183 extern int sysctl_x25_ack_holdback_timeout; 184 extern int sysctl_x25_forward; 185 186 extern int x25_parse_address_block(struct sk_buff *skb, 187 struct x25_address *called_addr, 188 struct x25_address *calling_addr); 189 190 extern int x25_addr_ntoa(unsigned char *, struct x25_address *, 191 struct x25_address *); 192 extern int x25_addr_aton(unsigned char *, struct x25_address *, 193 struct x25_address *); 194 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *); 195 extern void x25_destroy_socket_from_timer(struct sock *); 196 extern int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int); 197 extern void x25_kill_by_neigh(struct x25_neigh *); 198 199 /* x25_dev.c */ 200 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *); 201 extern int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 202 extern void x25_establish_link(struct x25_neigh *); 203 extern void x25_terminate_link(struct x25_neigh *); 204 205 /* x25_facilities.c */ 206 extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, 207 struct x25_dte_facilities *, unsigned long *); 208 extern int x25_create_facilities(unsigned char *, struct x25_facilities *, 209 struct x25_dte_facilities *, unsigned long); 210 extern int x25_negotiate_facilities(struct sk_buff *, struct sock *, 211 struct x25_facilities *, 212 struct x25_dte_facilities *); 213 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); 214 215 /* x25_forward.c */ 216 extern void x25_clear_forward_by_lci(unsigned int lci); 217 extern void x25_clear_forward_by_dev(struct net_device *); 218 extern int x25_forward_data(int, struct x25_neigh *, struct sk_buff *); 219 extern int x25_forward_call(struct x25_address *, struct x25_neigh *, 220 struct sk_buff *, int); 221 222 /* x25_in.c */ 223 extern int x25_process_rx_frame(struct sock *, struct sk_buff *); 224 extern int x25_backlog_rcv(struct sock *, struct sk_buff *); 225 226 /* x25_link.c */ 227 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); 228 extern void x25_link_device_up(struct net_device *); 229 extern void x25_link_device_down(struct net_device *); 230 extern void x25_link_established(struct x25_neigh *); 231 extern void x25_link_terminated(struct x25_neigh *); 232 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char); 233 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *); 234 extern int x25_subscr_ioctl(unsigned int, void __user *); 235 extern struct x25_neigh *x25_get_neigh(struct net_device *); 236 extern void x25_link_free(void); 237 238 /* x25_neigh.c */ 239 static __inline__ void x25_neigh_hold(struct x25_neigh *nb) 240 { 241 atomic_inc(&nb->refcnt); 242 } 243 244 static __inline__ void x25_neigh_put(struct x25_neigh *nb) 245 { 246 if (atomic_dec_and_test(&nb->refcnt)) 247 kfree(nb); 248 } 249 250 /* x25_out.c */ 251 extern int x25_output(struct sock *, struct sk_buff *); 252 extern void x25_kick(struct sock *); 253 extern void x25_enquiry_response(struct sock *); 254 255 /* x25_route.c */ 256 extern struct x25_route *x25_get_route(struct x25_address *addr); 257 extern struct net_device *x25_dev_get(char *); 258 extern void x25_route_device_down(struct net_device *dev); 259 extern int x25_route_ioctl(unsigned int, void __user *); 260 extern void x25_route_free(void); 261 262 static __inline__ void x25_route_hold(struct x25_route *rt) 263 { 264 atomic_inc(&rt->refcnt); 265 } 266 267 static __inline__ void x25_route_put(struct x25_route *rt) 268 { 269 if (atomic_dec_and_test(&rt->refcnt)) 270 kfree(rt); 271 } 272 273 /* x25_subr.c */ 274 extern void x25_clear_queues(struct sock *); 275 extern void x25_frames_acked(struct sock *, unsigned short); 276 extern void x25_requeue_frames(struct sock *); 277 extern int x25_validate_nr(struct sock *, unsigned short); 278 extern void x25_write_internal(struct sock *, int); 279 extern int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *); 280 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char); 281 282 /* x25_timer.c */ 283 extern void x25_init_timers(struct sock *sk); 284 extern void x25_start_heartbeat(struct sock *); 285 extern void x25_start_t2timer(struct sock *); 286 extern void x25_start_t21timer(struct sock *); 287 extern void x25_start_t22timer(struct sock *); 288 extern void x25_start_t23timer(struct sock *); 289 extern void x25_stop_heartbeat(struct sock *); 290 extern void x25_stop_timer(struct sock *); 291 extern unsigned long x25_display_timer(struct sock *); 292 extern void x25_check_rbuf(struct sock *); 293 294 /* sysctl_net_x25.c */ 295 #ifdef CONFIG_SYSCTL 296 extern void x25_register_sysctl(void); 297 extern void x25_unregister_sysctl(void); 298 #else 299 static inline void x25_register_sysctl(void) {}; 300 static inline void x25_unregister_sysctl(void) {}; 301 #endif /* CONFIG_SYSCTL */ 302 303 struct x25_skb_cb { 304 unsigned flags; 305 }; 306 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb)) 307 308 extern struct hlist_head x25_list; 309 extern rwlock_t x25_list_lock; 310 extern struct list_head x25_route_list; 311 extern rwlock_t x25_route_list_lock; 312 extern struct list_head x25_forward_list; 313 extern rwlock_t x25_forward_list_lock; 314 315 extern int x25_proc_init(void); 316 extern void x25_proc_exit(void); 317 #endif 318