1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Declarations of NET/ROM type objects. 4 * 5 * Jonathan Naylor G4KLX 9/4/95 6 */ 7 8 #ifndef _NETROM_H 9 #define _NETROM_H 10 11 #include <linux/netrom.h> 12 #include <linux/list.h> 13 #include <linux/slab.h> 14 #include <net/sock.h> 15 #include <linux/refcount.h> 16 #include <linux/seq_file.h> 17 #include <net/ax25.h> 18 19 #define NR_NETWORK_LEN 15 20 #define NR_TRANSPORT_LEN 5 21 22 #define NR_PROTO_IP 0x0C 23 24 #define NR_PROTOEXT 0x00 25 #define NR_CONNREQ 0x01 26 #define NR_CONNACK 0x02 27 #define NR_DISCREQ 0x03 28 #define NR_DISCACK 0x04 29 #define NR_INFO 0x05 30 #define NR_INFOACK 0x06 31 #define NR_RESET 0x07 32 33 #define NR_CHOKE_FLAG 0x80 34 #define NR_NAK_FLAG 0x40 35 #define NR_MORE_FLAG 0x20 36 37 /* Define Link State constants. */ 38 enum { 39 NR_STATE_0, 40 NR_STATE_1, 41 NR_STATE_2, 42 NR_STATE_3 43 }; 44 45 #define NR_COND_ACK_PENDING 0x01 46 #define NR_COND_REJECT 0x02 47 #define NR_COND_PEER_RX_BUSY 0x04 48 #define NR_COND_OWN_RX_BUSY 0x08 49 50 #define NR_DEFAULT_T1 120000 /* Outstanding frames - 120 seconds */ 51 #define NR_DEFAULT_T2 5000 /* Response delay - 5 seconds */ 52 #define NR_DEFAULT_N2 3 /* Number of Retries - 3 */ 53 #define NR_DEFAULT_T4 180000 /* Busy Delay - 180 seconds */ 54 #define NR_DEFAULT_IDLE 0 /* No Activity Timeout - none */ 55 #define NR_DEFAULT_WINDOW 4 /* Default Window Size - 4 */ 56 #define NR_DEFAULT_OBS 6 /* Default Obsolescence Count - 6 */ 57 #define NR_DEFAULT_QUAL 10 /* Default Neighbour Quality - 10 */ 58 #define NR_DEFAULT_TTL 16 /* Default Time To Live - 16 */ 59 #define NR_DEFAULT_ROUTING 1 /* Is routing enabled ? */ 60 #define NR_DEFAULT_FAILS 2 /* Link fails until route fails */ 61 #define NR_DEFAULT_RESET 0 /* Sent / accept reset cmds? */ 62 63 #define NR_MODULUS 256 64 #define NR_MAX_WINDOW_SIZE 127 /* Maximum Window Allowable - 127 */ 65 #define NR_MAX_PACKET_SIZE 236 /* Maximum Packet Length - 236 */ 66 67 struct nr_sock { 68 struct sock sock; 69 ax25_address user_addr, source_addr, dest_addr; 70 struct net_device *device; 71 unsigned char my_index, my_id; 72 unsigned char your_index, your_id; 73 unsigned char state, condition, bpqext, window; 74 unsigned short vs, vr, va, vl; 75 unsigned char n2, n2count; 76 unsigned long t1, t2, t4, idle; 77 unsigned short fraglen; 78 struct timer_list t1timer; 79 struct timer_list t2timer; 80 struct timer_list t4timer; 81 struct timer_list idletimer; 82 struct sk_buff_head ack_queue; 83 struct sk_buff_head reseq_queue; 84 struct sk_buff_head frag_queue; 85 }; 86 87 #define nr_sk(sk) ((struct nr_sock *)(sk)) 88 89 struct nr_neigh { 90 struct hlist_node neigh_node; 91 ax25_address callsign; 92 ax25_digi *digipeat; 93 ax25_cb *ax25; 94 struct net_device *dev; 95 unsigned char quality; 96 unsigned char locked; 97 unsigned short count; 98 unsigned int number; 99 unsigned char failed; 100 refcount_t refcount; 101 }; 102 103 struct nr_route { 104 unsigned char quality; 105 unsigned char obs_count; 106 struct nr_neigh *neighbour; 107 }; 108 109 struct nr_node { 110 struct hlist_node node_node; 111 ax25_address callsign; 112 char mnemonic[7]; 113 unsigned char which; 114 unsigned char count; 115 struct nr_route routes[3]; 116 refcount_t refcount; 117 spinlock_t node_lock; 118 }; 119 120 /********************************************************************* 121 * nr_node & nr_neigh lists, refcounting and locking 122 *********************************************************************/ 123 124 #define nr_node_hold(__nr_node) \ 125 refcount_inc(&((__nr_node)->refcount)) 126 nr_node_put(struct nr_node * nr_node)127 static __inline__ void nr_node_put(struct nr_node *nr_node) 128 { 129 if (refcount_dec_and_test(&nr_node->refcount)) { 130 kfree(nr_node); 131 } 132 } 133 134 #define nr_neigh_hold(__nr_neigh) \ 135 refcount_inc(&((__nr_neigh)->refcount)) 136 nr_neigh_put(struct nr_neigh * nr_neigh)137 static __inline__ void nr_neigh_put(struct nr_neigh *nr_neigh) 138 { 139 if (refcount_dec_and_test(&nr_neigh->refcount)) { 140 if (nr_neigh->ax25) 141 ax25_cb_put(nr_neigh->ax25); 142 kfree(nr_neigh->digipeat); 143 kfree(nr_neigh); 144 } 145 } 146 147 /* nr_node_lock and nr_node_unlock also hold/put the node's refcounter. 148 */ nr_node_lock(struct nr_node * nr_node)149 static __inline__ void nr_node_lock(struct nr_node *nr_node) 150 { 151 nr_node_hold(nr_node); 152 spin_lock_bh(&nr_node->node_lock); 153 } 154 nr_node_unlock(struct nr_node * nr_node)155 static __inline__ void nr_node_unlock(struct nr_node *nr_node) 156 { 157 spin_unlock_bh(&nr_node->node_lock); 158 nr_node_put(nr_node); 159 } 160 161 #define nr_neigh_for_each(__nr_neigh, list) \ 162 hlist_for_each_entry(__nr_neigh, list, neigh_node) 163 164 #define nr_neigh_for_each_safe(__nr_neigh, node2, list) \ 165 hlist_for_each_entry_safe(__nr_neigh, node2, list, neigh_node) 166 167 #define nr_node_for_each(__nr_node, list) \ 168 hlist_for_each_entry(__nr_node, list, node_node) 169 170 #define nr_node_for_each_safe(__nr_node, node2, list) \ 171 hlist_for_each_entry_safe(__nr_node, node2, list, node_node) 172 173 174 /*********************************************************************/ 175 176 /* af_netrom.c */ 177 extern int sysctl_netrom_default_path_quality; 178 extern int sysctl_netrom_obsolescence_count_initialiser; 179 extern int sysctl_netrom_network_ttl_initialiser; 180 extern int sysctl_netrom_transport_timeout; 181 extern int sysctl_netrom_transport_maximum_tries; 182 extern int sysctl_netrom_transport_acknowledge_delay; 183 extern int sysctl_netrom_transport_busy_delay; 184 extern int sysctl_netrom_transport_requested_window_size; 185 extern int sysctl_netrom_transport_no_activity_timeout; 186 extern int sysctl_netrom_routing_control; 187 extern int sysctl_netrom_link_fails_count; 188 extern int sysctl_netrom_reset_circuit; 189 190 int nr_rx_frame(struct sk_buff *, struct net_device *); 191 void nr_destroy_socket(struct sock *); 192 193 /* nr_dev.c */ 194 int nr_rx_ip(struct sk_buff *, struct net_device *); 195 void nr_setup(struct net_device *); 196 197 /* nr_in.c */ 198 int nr_process_rx_frame(struct sock *, struct sk_buff *); 199 200 /* nr_loopback.c */ 201 void nr_loopback_init(void); 202 void nr_loopback_clear(void); 203 int nr_loopback_queue(struct sk_buff *); 204 205 /* nr_out.c */ 206 void nr_output(struct sock *, struct sk_buff *); 207 void nr_send_nak_frame(struct sock *); 208 void nr_kick(struct sock *); 209 void nr_transmit_buffer(struct sock *, struct sk_buff *); 210 void nr_establish_data_link(struct sock *); 211 void nr_enquiry_response(struct sock *); 212 void nr_check_iframes_acked(struct sock *, unsigned short); 213 214 /* nr_route.c */ 215 void nr_rt_device_down(struct net_device *); 216 struct net_device *nr_dev_first(void); 217 struct net_device *nr_dev_get(ax25_address *); 218 int nr_rt_ioctl(unsigned int, void __user *); 219 void nr_link_failed(ax25_cb *, int); 220 int nr_route_frame(struct sk_buff *, ax25_cb *); 221 extern const struct seq_operations nr_node_seqops; 222 extern const struct seq_operations nr_neigh_seqops; 223 void nr_rt_free(void); 224 225 /* nr_subr.c */ 226 void nr_clear_queues(struct sock *); 227 void nr_frames_acked(struct sock *, unsigned short); 228 void nr_requeue_frames(struct sock *); 229 int nr_validate_nr(struct sock *, unsigned short); 230 int nr_in_rx_window(struct sock *, unsigned short); 231 void nr_write_internal(struct sock *, int); 232 233 void __nr_transmit_reply(struct sk_buff *skb, int mine, unsigned char cmdflags); 234 235 /* 236 * This routine is called when a Connect Acknowledge with the Choke Flag 237 * set is needed to refuse a connection. 238 */ 239 #define nr_transmit_refusal(skb, mine) \ 240 do { \ 241 __nr_transmit_reply((skb), (mine), NR_CONNACK | NR_CHOKE_FLAG); \ 242 } while (0) 243 244 /* 245 * This routine is called when we don't have a circuit matching an incoming 246 * NET/ROM packet. This is an G8PZT Xrouter extension. 247 */ 248 #define nr_transmit_reset(skb, mine) \ 249 do { \ 250 __nr_transmit_reply((skb), (mine), NR_RESET); \ 251 } while (0) 252 253 void nr_disconnect(struct sock *, int); 254 255 /* nr_timer.c */ 256 void nr_init_timers(struct sock *sk); 257 void nr_start_heartbeat(struct sock *); 258 void nr_start_t1timer(struct sock *); 259 void nr_start_t2timer(struct sock *); 260 void nr_start_t4timer(struct sock *); 261 void nr_start_idletimer(struct sock *); 262 void nr_stop_heartbeat(struct sock *); 263 void nr_stop_t1timer(struct sock *); 264 void nr_stop_t2timer(struct sock *); 265 void nr_stop_t4timer(struct sock *); 266 void nr_stop_idletimer(struct sock *); 267 int nr_t1timer_running(struct sock *); 268 269 /* sysctl_net_netrom.c */ 270 int nr_register_sysctl(void); 271 void nr_unregister_sysctl(void); 272 273 #endif 274