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