include/net/dn.h

   1 #ifndef _NET_DN_H
   2 #define _NET_DN_H
   3
   4 #include <linux/dn.h>
   5 #include <net/sock.h>
   6 #include <asm/byteorder.h>
   7
   8 typedef unsigned short dn_address;
   9
  10 #define dn_ntohs(x) le16_to_cpu((unsigned short)(x))
  11 #define dn_htons(x) cpu_to_le16((unsigned short)(x))
  12
  13 struct dn_scp                                   /* Session Control Port */
  14 {
  15         unsigned char           state;
  16 #define DN_O     1                      /* Open                 */
  17 #define DN_CR    2                      /* Connect Receive      */
  18 #define DN_DR    3                      /* Disconnect Reject    */
  19 #define DN_DRC   4                      /* Discon. Rej. Complete*/
  20 #define DN_CC    5                      /* Connect Confirm      */
  21 #define DN_CI    6                      /* Connect Initiate     */
  22 #define DN_NR    7                      /* No resources         */
  23 #define DN_NC    8                      /* No communication     */
  24 #define DN_CD    9                      /* Connect Delivery     */
  25 #define DN_RJ    10                     /* Rejected             */
  26 #define DN_RUN   11                     /* Running              */
  27 #define DN_DI    12                     /* Disconnect Initiate  */
  28 #define DN_DIC   13                     /* Disconnect Complete  */
  29 #define DN_DN    14                     /* Disconnect Notificat */
  30 #define DN_CL    15                     /* Closed               */
  31 #define DN_CN    16                     /* Closed Notification  */
  32
  33         unsigned short          addrloc;
  34         unsigned short          addrrem;
  35         unsigned short          numdat;
  36         unsigned short          numoth;
  37         unsigned short          numoth_rcv;
  38         unsigned short          numdat_rcv;
  39         unsigned short          ackxmt_dat;
  40         unsigned short          ackxmt_oth;
  41         unsigned short          ackrcv_dat;
  42         unsigned short          ackrcv_oth;
  43         unsigned char           flowrem_sw;
  44         unsigned char           flowloc_sw;
  45 #define DN_SEND         2
  46 #define DN_DONTSEND     1
  47 #define DN_NOCHANGE     0
  48         unsigned short          flowrem_dat;
  49         unsigned short          flowrem_oth;
  50         unsigned short          flowloc_dat;
  51         unsigned short          flowloc_oth;
  52         unsigned char           services_rem;
  53         unsigned char           services_loc;
  54         unsigned char           info_rem;
  55         unsigned char           info_loc;
  56
  57         unsigned short          segsize_rem;
  58         unsigned short          segsize_loc;
  59
  60         unsigned char           nonagle;
  61         unsigned char           multi_ireq;
  62         unsigned char           accept_mode;
  63         unsigned long           seg_total; /* Running total of current segment */
  64
  65         struct optdata_dn     conndata_in;
  66         struct optdata_dn     conndata_out;
  67         struct optdata_dn     discdata_in;
  68         struct optdata_dn     discdata_out;
  69         struct accessdata_dn  accessdata;
  70
  71         struct sockaddr_dn addr; /* Local address  */
  72         struct sockaddr_dn peer; /* Remote address */
  73
  74         /*
  75          * In this case the RTT estimation is not specified in the
  76          * docs, nor is any back off algorithm. Here we follow well
  77          * known tcp algorithms with a few small variations.
  78          *
  79          * snd_window: Max number of packets we send before we wait for
  80          *             an ack to come back. This will become part of a
  81          *             more complicated scheme when we support flow
  82          *             control.
  83          *
  84          * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
  85          *             average.
  86          * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
  87          *             varience of the smoothed average (but calculated in
  88          *             a simpler way than for normal statistical varience
  89          *             calculations).
  90          *
  91          * nsp_rxtshift: Backoff counter. Value is zero normally, each time
  92          *               a packet is lost is increases by one until an ack
  93          *               is received. Its used to index an array of backoff
  94          *               multipliers.
  95          */
  96 #define NSP_MIN_WINDOW 1
  97 #define NSP_MAX_WINDOW (0x07fe)
  98         unsigned long max_window;
  99         unsigned long snd_window;
 100 #define NSP_INITIAL_SRTT (HZ)
 101         unsigned long nsp_srtt;
 102 #define NSP_INITIAL_RTTVAR (HZ*3)
 103         unsigned long nsp_rttvar;
 104 #define NSP_MAXRXTSHIFT 12
 105         unsigned long nsp_rxtshift;
 106
 107         /*
 108          * Output queues, one for data, one for otherdata/linkservice
 109          */
 110         struct sk_buff_head data_xmit_queue;
 111         struct sk_buff_head other_xmit_queue;
 112
 113         /*
 114          * Input queue for other data
 115          */
 116         struct sk_buff_head other_receive_queue;
 117         int other_report;
 118
 119         /*
 120          * Stuff to do with the slow timer
 121          */
 122         unsigned long stamp;          /* time of last transmit */
 123         unsigned long persist;
 124         int (*persist_fxn)(struct sock *sk);
 125         unsigned long keepalive;
 126         void (*keepalive_fxn)(struct sock *sk);
 127
 128         /*
 129          * This stuff is for the fast timer for delayed acks
 130          */
 131         struct timer_list delack_timer;
 132         int delack_pending;
 133         void (*delack_fxn)(struct sock *sk);
 134
 135 };
 136
 137 static inline struct dn_scp *DN_SK(struct sock *sk)
 138 {
 139         return (struct dn_scp *)(sk + 1);
 140 }
 141
 142 /*
 143  * src,dst : Source and Destination DECnet addresses
 144  * hops : Number of hops through the network
 145  * dst_port, src_port : NSP port numbers
 146  * services, info : Useful data extracted from conninit messages
 147  * rt_flags : Routing flags byte
 148  * nsp_flags : NSP layer flags byte
 149  * segsize : Size of segment
 150  * segnum : Number, for data, otherdata and linkservice
 151  * xmit_count : Number of times we've transmitted this skb
 152  * stamp : Time stamp of most recent transmission, used in RTT calculations
 153  * iif: Input interface number
 154  *
 155  * As a general policy, this structure keeps all addresses in network
 156  * byte order, and all else in host byte order. Thus dst, src, dst_port
 157  * and src_port are in network order. All else is in host order.
 158  *
 159  */
 160 #define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
 161 struct dn_skb_cb {
 162         unsigned short dst;
 163         unsigned short src;
 164         unsigned short hops;
 165         unsigned short dst_port;
 166         unsigned short src_port;
 167         unsigned char services;
 168         unsigned char info;
 169         unsigned char rt_flags;
 170         unsigned char nsp_flags;
 171         unsigned short segsize;
 172         unsigned short segnum;
 173         unsigned short xmit_count;
 174         unsigned long stamp;
 175         int iif;
 176 };
 177
 178 static inline dn_address dn_eth2dn(unsigned char *ethaddr)
 179 {
 180         return ethaddr[4] | (ethaddr[5] << 8);
 181 }
 182
 183 static inline dn_address dn_saddr2dn(struct sockaddr_dn *saddr)
 184 {
 185         return *(dn_address *)saddr->sdn_nodeaddr;
 186 }
 187
 188 static inline void dn_dn2eth(unsigned char *ethaddr, dn_address addr)
 189 {
 190         ethaddr[0] = 0xAA;
 191         ethaddr[1] = 0x00;
 192         ethaddr[2] = 0x04;
 193         ethaddr[3] = 0x00;
 194         ethaddr[4] = (unsigned char)(addr & 0xff);
 195         ethaddr[5] = (unsigned char)(addr >> 8);
 196 }
 197
 198 static inline void dn_sk_ports_copy(struct flowi *fl, struct dn_scp *scp)
 199 {
 200         fl->uli_u.dnports.sport = scp->addrloc;
 201         fl->uli_u.dnports.dport = scp->addrrem;
 202         fl->uli_u.dnports.objnum = scp->addr.sdn_objnum;
 203         if (fl->uli_u.dnports.objnum == 0) {
 204                 fl->uli_u.dnports.objnamel = scp->addr.sdn_objnamel;
 205                 memcpy(fl->uli_u.dnports.objname, scp->addr.sdn_objname, 16);
 206         }
 207 }
 208
 209 extern unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu);
 210
 211 #define DN_MENUVER_ACC 0x01
 212 #define DN_MENUVER_USR 0x02
 213 #define DN_MENUVER_PRX 0x04
 214 #define DN_MENUVER_UIC 0x08
 215
 216 extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
 217 extern struct sock *dn_find_by_skb(struct sk_buff *skb);
 218 #define DN_ASCBUF_LEN 9
 219 extern char *dn_addr2asc(dn_address, char *);
 220 extern int dn_destroy_timer(struct sock *sk);
 221
 222 extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
 223 extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
 224
 225 extern void dn_start_slow_timer(struct sock *sk);
 226 extern void dn_stop_slow_timer(struct sock *sk);
 227
 228 extern dn_address decnet_address;
 229 extern int decnet_debug_level;
 230 extern int decnet_time_wait;
 231 extern int decnet_dn_count;
 232 extern int decnet_di_count;
 233 extern int decnet_dr_count;
 234 extern int decnet_no_fc_max_cwnd;
 235
 236 #endif /* _NET_DN_H */