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 <linux/refcount.h> 15 #include <net/sock.h> 16 17 #define X25_ADDR_LEN 16 18 19 #define X25_MAX_L2_LEN 18 /* 802.2 LLC */ 20 21 #define X25_STD_MIN_LEN 3 22 #define X25_EXT_MIN_LEN 4 23 24 #define X25_GFI_SEQ_MASK 0x30 25 #define X25_GFI_STDSEQ 0x10 26 #define X25_GFI_EXTSEQ 0x20 27 28 #define X25_Q_BIT 0x80 29 #define X25_D_BIT 0x40 30 #define X25_STD_M_BIT 0x10 31 #define X25_EXT_M_BIT 0x01 32 33 #define X25_CALL_REQUEST 0x0B 34 #define X25_CALL_ACCEPTED 0x0F 35 #define X25_CLEAR_REQUEST 0x13 36 #define X25_CLEAR_CONFIRMATION 0x17 37 #define X25_DATA 0x00 38 #define X25_INTERRUPT 0x23 39 #define X25_INTERRUPT_CONFIRMATION 0x27 40 #define X25_RR 0x01 41 #define X25_RNR 0x05 42 #define X25_REJ 0x09 43 #define X25_RESET_REQUEST 0x1B 44 #define X25_RESET_CONFIRMATION 0x1F 45 #define X25_REGISTRATION_REQUEST 0xF3 46 #define X25_REGISTRATION_CONFIRMATION 0xF7 47 #define X25_RESTART_REQUEST 0xFB 48 #define X25_RESTART_CONFIRMATION 0xFF 49 #define X25_DIAGNOSTIC 0xF1 50 #define X25_ILLEGAL 0xFD 51 52 /* Define the various conditions that may exist */ 53 54 #define X25_COND_ACK_PENDING 0x01 55 #define X25_COND_OWN_RX_BUSY 0x02 56 #define X25_COND_PEER_RX_BUSY 0x04 57 58 /* Define Link State constants. */ 59 enum { 60 X25_STATE_0, /* Ready */ 61 X25_STATE_1, /* Awaiting Call Accepted */ 62 X25_STATE_2, /* Awaiting Clear Confirmation */ 63 X25_STATE_3, /* Data Transfer */ 64 X25_STATE_4 /* Awaiting Reset Confirmation */ 65 }; 66 67 enum { 68 X25_LINK_STATE_0, 69 X25_LINK_STATE_1, 70 X25_LINK_STATE_2, 71 X25_LINK_STATE_3 72 }; 73 74 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */ 75 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */ 76 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */ 77 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */ 78 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */ 79 80 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */ 81 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */ 82 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */ 83 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */ 84 85 #define X25_SMODULUS 8 86 #define X25_EMODULUS 128 87 88 /* 89 * X.25 Facilities constants. 90 */ 91 92 #define X25_FAC_CLASS_MASK 0xC0 93 94 #define X25_FAC_CLASS_A 0x00 95 #define X25_FAC_CLASS_B 0x40 96 #define X25_FAC_CLASS_C 0x80 97 #define X25_FAC_CLASS_D 0xC0 98 99 #define X25_FAC_REVERSE 0x01 /* also fast select */ 100 #define X25_FAC_THROUGHPUT 0x02 101 #define X25_FAC_PACKET_SIZE 0x42 102 #define X25_FAC_WINDOW_SIZE 0x43 103 104 #define X25_MAX_FAC_LEN 60 105 #define X25_MAX_CUD_LEN 128 106 107 #define X25_FAC_CALLING_AE 0xCB 108 #define X25_FAC_CALLED_AE 0xC9 109 110 #define X25_MARKER 0x00 111 #define X25_DTE_SERVICES 0x0F 112 #define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */ 113 #define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */ 114 115 /* Bitset in x25_sock->flags for misc flags */ 116 #define X25_Q_BIT_FLAG 0 117 #define X25_INTERRUPT_FLAG 1 118 #define X25_ACCPT_APPRV_FLAG 2 119 120 /** 121 * struct x25_route - x25 routing entry 122 * @node - entry in x25_list_lock 123 * @address - Start of address range 124 * @sigdigits - Number of sig digits 125 * @dev - More than one for MLP 126 * @refcnt - reference counter 127 */ 128 struct x25_route { 129 struct list_head node; 130 struct x25_address address; 131 unsigned int sigdigits; 132 struct net_device *dev; 133 refcount_t refcnt; 134 }; 135 136 struct x25_neigh { 137 struct list_head node; 138 struct net_device *dev; 139 unsigned int state; 140 unsigned int extended; 141 struct sk_buff_head queue; 142 unsigned long t20; 143 struct timer_list t20timer; 144 unsigned long global_facil_mask; 145 refcount_t refcnt; 146 }; 147 148 struct x25_sock { 149 struct sock sk; 150 struct x25_address source_addr, dest_addr; 151 struct x25_neigh *neighbour; 152 unsigned int lci, cudmatchlength; 153 unsigned char state, condition; 154 unsigned short vs, vr, va, vl; 155 unsigned long t2, t21, t22, t23; 156 unsigned short fraglen; 157 unsigned long flags; 158 struct sk_buff_head ack_queue; 159 struct sk_buff_head fragment_queue; 160 struct sk_buff_head interrupt_in_queue; 161 struct sk_buff_head interrupt_out_queue; 162 struct timer_list timer; 163 struct x25_causediag causediag; 164 struct x25_facilities facilities; 165 struct x25_dte_facilities dte_facilities; 166 struct x25_calluserdata calluserdata; 167 unsigned long vc_facil_mask; /* inc_call facilities mask */ 168 }; 169 170 struct x25_forward { 171 struct list_head node; 172 unsigned int lci; 173 struct net_device *dev1; 174 struct net_device *dev2; 175 atomic_t refcnt; 176 }; 177 178 static inline struct x25_sock *x25_sk(const struct sock *sk) 179 { 180 return (struct x25_sock *)sk; 181 } 182 183 /* af_x25.c */ 184 extern int sysctl_x25_restart_request_timeout; 185 extern int sysctl_x25_call_request_timeout; 186 extern int sysctl_x25_reset_request_timeout; 187 extern int sysctl_x25_clear_request_timeout; 188 extern int sysctl_x25_ack_holdback_timeout; 189 extern int sysctl_x25_forward; 190 191 int x25_parse_address_block(struct sk_buff *skb, 192 struct x25_address *called_addr, 193 struct x25_address *calling_addr); 194 195 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *); 196 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *); 197 struct sock *x25_find_socket(unsigned int, struct x25_neigh *); 198 void x25_destroy_socket_from_timer(struct sock *); 199 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int); 200 void x25_kill_by_neigh(struct x25_neigh *); 201 202 /* x25_dev.c */ 203 void x25_send_frame(struct sk_buff *, struct x25_neigh *); 204 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, 205 struct packet_type *, struct net_device *); 206 void x25_establish_link(struct x25_neigh *); 207 void x25_terminate_link(struct x25_neigh *); 208 209 /* x25_facilities.c */ 210 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, 211 struct x25_dte_facilities *, unsigned long *); 212 int x25_create_facilities(unsigned char *, struct x25_facilities *, 213 struct x25_dte_facilities *, unsigned long); 214 int x25_negotiate_facilities(struct sk_buff *, struct sock *, 215 struct x25_facilities *, 216 struct x25_dte_facilities *); 217 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *); 218 219 /* x25_forward.c */ 220 void x25_clear_forward_by_lci(unsigned int lci); 221 void x25_clear_forward_by_dev(struct net_device *); 222 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *); 223 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *, 224 int); 225 226 /* x25_in.c */ 227 int x25_process_rx_frame(struct sock *, struct sk_buff *); 228 int x25_backlog_rcv(struct sock *, struct sk_buff *); 229 230 /* x25_link.c */ 231 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short); 232 void x25_link_device_up(struct net_device *); 233 void x25_link_device_down(struct net_device *); 234 void x25_link_established(struct x25_neigh *); 235 void x25_link_terminated(struct x25_neigh *); 236 void x25_transmit_clear_request(struct x25_neigh *, unsigned int, 237 unsigned char); 238 void x25_transmit_link(struct sk_buff *, struct x25_neigh *); 239 int x25_subscr_ioctl(unsigned int, void __user *); 240 struct x25_neigh *x25_get_neigh(struct net_device *); 241 void x25_link_free(void); 242 243 /* x25_neigh.c */ 244 static __inline__ void x25_neigh_hold(struct x25_neigh *nb) 245 { 246 refcount_inc(&nb->refcnt); 247 } 248 249 static __inline__ void x25_neigh_put(struct x25_neigh *nb) 250 { 251 if (refcount_dec_and_test(&nb->refcnt)) 252 kfree(nb); 253 } 254 255 /* x25_out.c */ 256 int x25_output(struct sock *, struct sk_buff *); 257 void x25_kick(struct sock *); 258 void x25_enquiry_response(struct sock *); 259 260 /* x25_route.c */ 261 struct x25_route *x25_get_route(struct x25_address *addr); 262 struct net_device *x25_dev_get(char *); 263 void x25_route_device_down(struct net_device *dev); 264 int x25_route_ioctl(unsigned int, void __user *); 265 void x25_route_free(void); 266 267 static __inline__ void x25_route_hold(struct x25_route *rt) 268 { 269 refcount_inc(&rt->refcnt); 270 } 271 272 static __inline__ void x25_route_put(struct x25_route *rt) 273 { 274 if (refcount_dec_and_test(&rt->refcnt)) 275 kfree(rt); 276 } 277 278 /* x25_subr.c */ 279 void x25_clear_queues(struct sock *); 280 void x25_frames_acked(struct sock *, unsigned short); 281 void x25_requeue_frames(struct sock *); 282 int x25_validate_nr(struct sock *, unsigned short); 283 void x25_write_internal(struct sock *, int); 284 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, 285 int *); 286 void x25_disconnect(struct sock *, int, unsigned char, unsigned char); 287 288 /* x25_timer.c */ 289 void x25_init_timers(struct sock *sk); 290 void x25_start_heartbeat(struct sock *); 291 void x25_start_t2timer(struct sock *); 292 void x25_start_t21timer(struct sock *); 293 void x25_start_t22timer(struct sock *); 294 void x25_start_t23timer(struct sock *); 295 void x25_stop_heartbeat(struct sock *); 296 void x25_stop_timer(struct sock *); 297 unsigned long x25_display_timer(struct sock *); 298 void x25_check_rbuf(struct sock *); 299 300 /* sysctl_net_x25.c */ 301 #ifdef CONFIG_SYSCTL 302 int x25_register_sysctl(void); 303 void x25_unregister_sysctl(void); 304 #else 305 static inline int x25_register_sysctl(void) { return 0; }; 306 static inline void x25_unregister_sysctl(void) {}; 307 #endif /* CONFIG_SYSCTL */ 308 309 struct x25_skb_cb { 310 unsigned int flags; 311 }; 312 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb)) 313 314 extern struct hlist_head x25_list; 315 extern rwlock_t x25_list_lock; 316 extern struct list_head x25_route_list; 317 extern rwlock_t x25_route_list_lock; 318 extern struct list_head x25_forward_list; 319 extern rwlock_t x25_forward_list_lock; 320 extern struct list_head x25_neigh_list; 321 extern rwlock_t x25_neigh_list_lock; 322 323 int x25_proc_init(void); 324 void x25_proc_exit(void); 325 #endif 326