linux/include/net/dn.h
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   1#ifndef _NET_DN_H
   2#define _NET_DN_H
   3
   4#include <linux/dn.h>
   5#include <net/sock.h>
   6#include <net/flow.h>
   7#include <asm/byteorder.h>
   8#include <asm/unaligned.h>
   9
  10struct dn_scp                                   /* Session Control Port */
  11{
  12        unsigned char           state;
  13#define DN_O     1                      /* Open                 */
  14#define DN_CR    2                      /* Connect Receive      */
  15#define DN_DR    3                      /* Disconnect Reject    */
  16#define DN_DRC   4                      /* Discon. Rej. Complete*/
  17#define DN_CC    5                      /* Connect Confirm      */
  18#define DN_CI    6                      /* Connect Initiate     */
  19#define DN_NR    7                      /* No resources         */
  20#define DN_NC    8                      /* No communication     */
  21#define DN_CD    9                      /* Connect Delivery     */
  22#define DN_RJ    10                     /* Rejected             */
  23#define DN_RUN   11                     /* Running              */
  24#define DN_DI    12                     /* Disconnect Initiate  */
  25#define DN_DIC   13                     /* Disconnect Complete  */
  26#define DN_DN    14                     /* Disconnect Notificat */
  27#define DN_CL    15                     /* Closed               */
  28#define DN_CN    16                     /* Closed Notification  */
  29
  30        __le16          addrloc;
  31        __le16          addrrem;
  32        __u16          numdat;
  33        __u16          numoth;
  34        __u16          numoth_rcv;
  35        __u16          numdat_rcv;
  36        __u16          ackxmt_dat;
  37        __u16          ackxmt_oth;
  38        __u16          ackrcv_dat;
  39        __u16          ackrcv_oth;
  40        __u8           flowrem_sw;
  41        __u8           flowloc_sw;
  42#define DN_SEND         2
  43#define DN_DONTSEND     1
  44#define DN_NOCHANGE     0
  45        __u16           flowrem_dat;
  46        __u16           flowrem_oth;
  47        __u16           flowloc_dat;
  48        __u16           flowloc_oth;
  49        __u8            services_rem;
  50        __u8            services_loc;
  51        __u8            info_rem;
  52        __u8            info_loc;
  53
  54        __u16           segsize_rem;
  55        __u16           segsize_loc;
  56
  57        __u8            nonagle;
  58        __u8            multi_ireq;
  59        __u8            accept_mode;
  60        unsigned long           seg_total; /* Running total of current segment */
  61
  62        struct optdata_dn     conndata_in;
  63        struct optdata_dn     conndata_out;
  64        struct optdata_dn     discdata_in;
  65        struct optdata_dn     discdata_out;
  66        struct accessdata_dn  accessdata;
  67
  68        struct sockaddr_dn addr; /* Local address  */
  69        struct sockaddr_dn peer; /* Remote address */
  70
  71        /*
  72         * In this case the RTT estimation is not specified in the
  73         * docs, nor is any back off algorithm. Here we follow well
  74         * known tcp algorithms with a few small variations.
  75         *
  76         * snd_window: Max number of packets we send before we wait for
  77         *             an ack to come back. This will become part of a
  78         *             more complicated scheme when we support flow
  79         *             control.
  80         *
  81         * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
  82         *             average.
  83         * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
  84         *             varience of the smoothed average (but calculated in
  85         *             a simpler way than for normal statistical varience
  86         *             calculations).
  87         *
  88         * nsp_rxtshift: Backoff counter. Value is zero normally, each time
  89         *               a packet is lost is increases by one until an ack
  90         *               is received. Its used to index an array of backoff
  91         *               multipliers.
  92         */
  93#define NSP_MIN_WINDOW 1
  94#define NSP_MAX_WINDOW (0x07fe)
  95        unsigned long max_window;
  96        unsigned long snd_window;
  97#define NSP_INITIAL_SRTT (HZ)
  98        unsigned long nsp_srtt;
  99#define NSP_INITIAL_RTTVAR (HZ*3)
 100        unsigned long nsp_rttvar;
 101#define NSP_MAXRXTSHIFT 12
 102        unsigned long nsp_rxtshift;
 103
 104        /*
 105         * Output queues, one for data, one for otherdata/linkservice
 106         */
 107        struct sk_buff_head data_xmit_queue;
 108        struct sk_buff_head other_xmit_queue;
 109
 110        /*
 111         * Input queue for other data
 112         */
 113        struct sk_buff_head other_receive_queue;
 114        int other_report;
 115
 116        /*
 117         * Stuff to do with the slow timer
 118         */
 119        unsigned long stamp;          /* time of last transmit */
 120        unsigned long persist;
 121        int (*persist_fxn)(struct sock *sk);
 122        unsigned long keepalive;
 123        void (*keepalive_fxn)(struct sock *sk);
 124
 125        /*
 126         * This stuff is for the fast timer for delayed acks
 127         */
 128        struct timer_list delack_timer;
 129        int delack_pending;
 130        void (*delack_fxn)(struct sock *sk);
 131
 132};
 133
 134static inline struct dn_scp *DN_SK(struct sock *sk)
 135{
 136        return (struct dn_scp *)(sk + 1);
 137}
 138
 139/*
 140 * src,dst : Source and Destination DECnet addresses
 141 * hops : Number of hops through the network
 142 * dst_port, src_port : NSP port numbers
 143 * services, info : Useful data extracted from conninit messages
 144 * rt_flags : Routing flags byte
 145 * nsp_flags : NSP layer flags byte
 146 * segsize : Size of segment
 147 * segnum : Number, for data, otherdata and linkservice
 148 * xmit_count : Number of times we've transmitted this skb
 149 * stamp : Time stamp of most recent transmission, used in RTT calculations
 150 * iif: Input interface number
 151 *
 152 * As a general policy, this structure keeps all addresses in network
 153 * byte order, and all else in host byte order. Thus dst, src, dst_port
 154 * and src_port are in network order. All else is in host order.
 155 * 
 156 */
 157#define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
 158struct dn_skb_cb {
 159        __le16 dst;
 160        __le16 src;
 161        __u16 hops;
 162        __le16 dst_port;
 163        __le16 src_port;
 164        __u8 services;
 165        __u8 info;
 166        __u8 rt_flags;
 167        __u8 nsp_flags;
 168        __u16 segsize;
 169        __u16 segnum;
 170        __u16 xmit_count;
 171        unsigned long stamp;
 172        int iif;
 173};
 174
 175static inline __le16 dn_eth2dn(unsigned char *ethaddr)
 176{
 177        return get_unaligned((__le16 *)(ethaddr + 4));
 178}
 179
 180static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
 181{
 182        return *(__le16 *)saddr->sdn_nodeaddr;
 183}
 184
 185static inline void dn_dn2eth(unsigned char *ethaddr, __le16 addr)
 186{
 187        __u16 a = le16_to_cpu(addr);
 188        ethaddr[0] = 0xAA;
 189        ethaddr[1] = 0x00;
 190        ethaddr[2] = 0x04;
 191        ethaddr[3] = 0x00;
 192        ethaddr[4] = (__u8)(a & 0xff);
 193        ethaddr[5] = (__u8)(a >> 8);
 194}
 195
 196static inline void dn_sk_ports_copy(struct flowidn *fld, struct dn_scp *scp)
 197{
 198        fld->fld_sport = scp->addrloc;
 199        fld->fld_dport = scp->addrrem;
 200}
 201
 202extern unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu);
 203
 204#define DN_MENUVER_ACC 0x01
 205#define DN_MENUVER_USR 0x02
 206#define DN_MENUVER_PRX 0x04
 207#define DN_MENUVER_UIC 0x08
 208
 209extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
 210extern struct sock *dn_find_by_skb(struct sk_buff *skb);
 211#define DN_ASCBUF_LEN 9
 212extern char *dn_addr2asc(__u16, char *);
 213extern int dn_destroy_timer(struct sock *sk);
 214
 215extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
 216extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
 217
 218extern void dn_start_slow_timer(struct sock *sk);
 219extern void dn_stop_slow_timer(struct sock *sk);
 220
 221extern __le16 decnet_address;
 222extern int decnet_debug_level;
 223extern int decnet_time_wait;
 224extern int decnet_dn_count;
 225extern int decnet_di_count;
 226extern int decnet_dr_count;
 227extern int decnet_no_fc_max_cwnd;
 228
 229extern long sysctl_decnet_mem[3];
 230extern int sysctl_decnet_wmem[3];
 231extern int sysctl_decnet_rmem[3];
 232
 233#endif /* _NET_DN_H */
 234
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