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