include/net/netrom.h

   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
 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
 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  */
 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
 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 void nr_register_sysctl(void);
 270 void nr_unregister_sysctl(void);
 271
 272 #endif