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