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 #define dn_ntohs(x) le16_to_cpu(x)
  10 #define dn_htons(x) cpu_to_le16(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         __le16          addrloc;
  33         __le16          addrrem;
  34         __u16          numdat;
  35         __u16          numoth;
  36         __u16          numoth_rcv;
  37         __u16          numdat_rcv;
  38         __u16          ackxmt_dat;
  39         __u16          ackxmt_oth;
  40         __u16          ackrcv_dat;
  41         __u16          ackrcv_oth;
  42         __u8           flowrem_sw;
  43         __u8           flowloc_sw;
  44 #define DN_SEND         2
  45 #define DN_DONTSEND     1
  46 #define DN_NOCHANGE     0
  47         __u16           flowrem_dat;
  48         __u16           flowrem_oth;
  49         __u16           flowloc_dat;
  50         __u16           flowloc_oth;
  51         __u8            services_rem;
  52         __u8            services_loc;
  53         __u8            info_rem;
  54         __u8            info_loc;
  55
  56         __u16           segsize_rem;
  57         __u16           segsize_loc;
  58
  59         __u8            nonagle;
  60         __u8            multi_ireq;
  61         __u8            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 static inline struct dn_scp *DN_SK(struct sock *sk)
 137 {
 138         return (struct dn_scp *)(sk + 1);
 139 }
 140
 141 /*
 142  * src,dst : Source and Destination DECnet addresses
 143  * hops : Number of hops through the network
 144  * dst_port, src_port : NSP port numbers
 145  * services, info : Useful data extracted from conninit messages
 146  * rt_flags : Routing flags byte
 147  * nsp_flags : NSP layer flags byte
 148  * segsize : Size of segment
 149  * segnum : Number, for data, otherdata and linkservice
 150  * xmit_count : Number of times we've transmitted this skb
 151  * stamp : Time stamp of most recent transmission, used in RTT calculations
 152  * iif: Input interface number
 153  *
 154  * As a general policy, this structure keeps all addresses in network
 155  * byte order, and all else in host byte order. Thus dst, src, dst_port
 156  * and src_port are in network order. All else is in host order.
 157  *
 158  */
 159 #define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
 160 struct dn_skb_cb {
 161         __le16 dst;
 162         __le16 src;
 163         __u16 hops;
 164         __le16 dst_port;
 165         __le16 src_port;
 166         __u8 services;
 167         __u8 info;
 168         __u8 rt_flags;
 169         __u8 nsp_flags;
 170         __u16 segsize;
 171         __u16 segnum;
 172         __u16 xmit_count;
 173         unsigned long stamp;
 174         int iif;
 175 };
 176
 177 static inline __le16 dn_eth2dn(unsigned char *ethaddr)
 178 {
 179         return dn_htons(ethaddr[4] | (ethaddr[5] << 8));
 180 }
 181
 182 static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
 183 {
 184         return *(__le16 *)saddr->sdn_nodeaddr;
 185 }
 186
 187 static inline void dn_dn2eth(unsigned char *ethaddr, __le16 addr)
 188 {
 189         __u16 a = dn_ntohs(addr);
 190         ethaddr[0] = 0xAA;
 191         ethaddr[1] = 0x00;
 192         ethaddr[2] = 0x04;
 193         ethaddr[3] = 0x00;
 194         ethaddr[4] = (__u8)(a & 0xff);
 195         ethaddr[5] = (__u8)(a >> 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 = (__u8)dn_ntohs(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(__u16, 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 __le16 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 extern int sysctl_decnet_mem[3];
 237 extern int sysctl_decnet_wmem[3];
 238 extern int sysctl_decnet_rmem[3];
 239
 240 #endif /* _NET_DN_H */