include/net/dn.h

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