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