linux/include/net/netrom.h
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   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. */
  37enum {
  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
  66struct 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
  88struct 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
 102struct nr_route {
 103        unsigned char   quality;
 104        unsigned char   obs_count;
 105        struct nr_neigh *neighbour;
 106};
 107
 108struct 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
 126static __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
 136static __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 */
 148static __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
 154static __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 */
 176extern int  sysctl_netrom_default_path_quality;
 177extern int  sysctl_netrom_obsolescence_count_initialiser;
 178extern int  sysctl_netrom_network_ttl_initialiser;
 179extern int  sysctl_netrom_transport_timeout;
 180extern int  sysctl_netrom_transport_maximum_tries;
 181extern int  sysctl_netrom_transport_acknowledge_delay;
 182extern int  sysctl_netrom_transport_busy_delay;
 183extern int  sysctl_netrom_transport_requested_window_size;
 184extern int  sysctl_netrom_transport_no_activity_timeout;
 185extern int  sysctl_netrom_routing_control;
 186extern int  sysctl_netrom_link_fails_count;
 187extern int  sysctl_netrom_reset_circuit;
 188
 189int nr_rx_frame(struct sk_buff *, struct net_device *);
 190void nr_destroy_socket(struct sock *);
 191
 192/* nr_dev.c */
 193int nr_rx_ip(struct sk_buff *, struct net_device *);
 194void nr_setup(struct net_device *);
 195
 196/* nr_in.c */
 197int nr_process_rx_frame(struct sock *, struct sk_buff *);
 198
 199/* nr_loopback.c */
 200void nr_loopback_init(void);
 201void nr_loopback_clear(void);
 202int nr_loopback_queue(struct sk_buff *);
 203
 204/* nr_out.c */
 205void nr_output(struct sock *, struct sk_buff *);
 206void nr_send_nak_frame(struct sock *);
 207void nr_kick(struct sock *);
 208void nr_transmit_buffer(struct sock *, struct sk_buff *);
 209void nr_establish_data_link(struct sock *);
 210void nr_enquiry_response(struct sock *);
 211void nr_check_iframes_acked(struct sock *, unsigned short);
 212
 213/* nr_route.c */
 214void nr_rt_device_down(struct net_device *);
 215struct net_device *nr_dev_first(void);
 216struct net_device *nr_dev_get(ax25_address *);
 217int nr_rt_ioctl(unsigned int, void __user *);
 218void nr_link_failed(ax25_cb *, int);
 219int nr_route_frame(struct sk_buff *, ax25_cb *);
 220extern const struct seq_operations nr_node_seqops;
 221extern const struct seq_operations nr_neigh_seqops;
 222void nr_rt_free(void);
 223
 224/* nr_subr.c */
 225void nr_clear_queues(struct sock *);
 226void nr_frames_acked(struct sock *, unsigned short);
 227void nr_requeue_frames(struct sock *);
 228int nr_validate_nr(struct sock *, unsigned short);
 229int nr_in_rx_window(struct sock *, unsigned short);
 230void nr_write_internal(struct sock *, int);
 231
 232void __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)                                  \
 239do {                                                                    \
 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)                                    \
 248do {                                                                    \
 249        __nr_transmit_reply((skb), (mine), NR_RESET);                   \
 250} while (0)
 251
 252void nr_disconnect(struct sock *, int);
 253
 254/* nr_timer.c */
 255void nr_init_timers(struct sock *sk);
 256void nr_start_heartbeat(struct sock *);
 257void nr_start_t1timer(struct sock *);
 258void nr_start_t2timer(struct sock *);
 259void nr_start_t4timer(struct sock *);
 260void nr_start_idletimer(struct sock *);
 261void nr_stop_heartbeat(struct sock *);
 262void nr_stop_t1timer(struct sock *);
 263void nr_stop_t2timer(struct sock *);
 264void nr_stop_t4timer(struct sock *);
 265void nr_stop_idletimer(struct sock *);
 266int nr_t1timer_running(struct sock *);
 267
 268/* sysctl_net_netrom.c */
 269void nr_register_sysctl(void);
 270void nr_unregister_sysctl(void);
 271
 272#endif
 273
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