include/net/netrom.h

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