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/flow.h>
   7 #include <asm/byteorder.h>
   8 #include <asm/unaligned.h>
   9
  10 struct dn_scp                                   /* Session Control Port */
  11 {
  12         unsigned char           state;
  13 #define DN_O     1                      /* Open                 */
  14 #define DN_CR    2                      /* Connect Receive      */
  15 #define DN_DR    3                      /* Disconnect Reject    */
  16 #define DN_DRC   4                      /* Discon. Rej. Complete*/
  17 #define DN_CC    5                      /* Connect Confirm      */
  18 #define DN_CI    6                      /* Connect Initiate     */
  19 #define DN_NR    7                      /* No resources         */
  20 #define DN_NC    8                      /* No communication     */
  21 #define DN_CD    9                      /* Connect Delivery     */
  22 #define DN_RJ    10                     /* Rejected             */
  23 #define DN_RUN   11                     /* Running              */
  24 #define DN_DI    12                     /* Disconnect Initiate  */
  25 #define DN_DIC   13                     /* Disconnect Complete  */
  26 #define DN_DN    14                     /* Disconnect Notificat */
  27 #define DN_CL    15                     /* Closed               */
  28 #define DN_CN    16                     /* Closed Notification  */
  29
  30         __le16          addrloc;
  31         __le16          addrrem;
  32         __u16          numdat;
  33         __u16          numoth;
  34         __u16          numoth_rcv;
  35         __u16          numdat_rcv;
  36         __u16          ackxmt_dat;
  37         __u16          ackxmt_oth;
  38         __u16          ackrcv_dat;
  39         __u16          ackrcv_oth;
  40         __u8           flowrem_sw;
  41         __u8           flowloc_sw;
  42 #define DN_SEND         2
  43 #define DN_DONTSEND     1
  44 #define DN_NOCHANGE     0
  45         __u16           flowrem_dat;
  46         __u16           flowrem_oth;
  47         __u16           flowloc_dat;
  48         __u16           flowloc_oth;
  49         __u8            services_rem;
  50         __u8            services_loc;
  51         __u8            info_rem;
  52         __u8            info_loc;
  53
  54         __u16           segsize_rem;
  55         __u16           segsize_loc;
  56
  57         __u8            nonagle;
  58         __u8            multi_ireq;
  59         __u8            accept_mode;
  60         unsigned long           seg_total; /* Running total of current segment */
  61
  62         struct optdata_dn     conndata_in;
  63         struct optdata_dn     conndata_out;
  64         struct optdata_dn     discdata_in;
  65         struct optdata_dn     discdata_out;
  66         struct accessdata_dn  accessdata;
  67
  68         struct sockaddr_dn addr; /* Local address  */
  69         struct sockaddr_dn peer; /* Remote address */
  70
  71         /*
  72          * In this case the RTT estimation is not specified in the
  73          * docs, nor is any back off algorithm. Here we follow well
  74          * known tcp algorithms with a few small variations.
  75          *
  76          * snd_window: Max number of packets we send before we wait for
  77          *             an ack to come back. This will become part of a
  78          *             more complicated scheme when we support flow
  79          *             control.
  80          *
  81          * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
  82          *             average.
  83          * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
  84          *             varience of the smoothed average (but calculated in
  85          *             a simpler way than for normal statistical varience
  86          *             calculations).
  87          *
  88          * nsp_rxtshift: Backoff counter. Value is zero normally, each time
  89          *               a packet is lost is increases by one until an ack
  90          *               is received. Its used to index an array of backoff
  91          *               multipliers.
  92          */
  93 #define NSP_MIN_WINDOW 1
  94 #define NSP_MAX_WINDOW (0x07fe)
  95         unsigned long max_window;
  96         unsigned long snd_window;
  97 #define NSP_INITIAL_SRTT (HZ)
  98         unsigned long nsp_srtt;
  99 #define NSP_INITIAL_RTTVAR (HZ*3)
 100         unsigned long nsp_rttvar;
 101 #define NSP_MAXRXTSHIFT 12
 102         unsigned long nsp_rxtshift;
 103
 104         /*
 105          * Output queues, one for data, one for otherdata/linkservice
 106          */
 107         struct sk_buff_head data_xmit_queue;
 108         struct sk_buff_head other_xmit_queue;
 109
 110         /*
 111          * Input queue for other data
 112          */
 113         struct sk_buff_head other_receive_queue;
 114         int other_report;
 115
 116         /*
 117          * Stuff to do with the slow timer
 118          */
 119         unsigned long stamp;          /* time of last transmit */
 120         unsigned long persist;
 121         int (*persist_fxn)(struct sock *sk);
 122         unsigned long keepalive;
 123         void (*keepalive_fxn)(struct sock *sk);
 124
 125         /*
 126          * This stuff is for the fast timer for delayed acks
 127          */
 128         struct timer_list delack_timer;
 129         int delack_pending;
 130         void (*delack_fxn)(struct sock *sk);
 131
 132 };
 133
 134 static inline struct dn_scp *DN_SK(struct sock *sk)
 135 {
 136         return (struct dn_scp *)(sk + 1);
 137 }
 138
 139 /*
 140  * src,dst : Source and Destination DECnet addresses
 141  * hops : Number of hops through the network
 142  * dst_port, src_port : NSP port numbers
 143  * services, info : Useful data extracted from conninit messages
 144  * rt_flags : Routing flags byte
 145  * nsp_flags : NSP layer flags byte
 146  * segsize : Size of segment
 147  * segnum : Number, for data, otherdata and linkservice
 148  * xmit_count : Number of times we've transmitted this skb
 149  * stamp : Time stamp of most recent transmission, used in RTT calculations
 150  * iif: Input interface number
 151  *
 152  * As a general policy, this structure keeps all addresses in network
 153  * byte order, and all else in host byte order. Thus dst, src, dst_port
 154  * and src_port are in network order. All else is in host order.
 155  *
 156  */
 157 #define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
 158 struct dn_skb_cb {
 159         __le16 dst;
 160         __le16 src;
 161         __u16 hops;
 162         __le16 dst_port;
 163         __le16 src_port;
 164         __u8 services;
 165         __u8 info;
 166         __u8 rt_flags;
 167         __u8 nsp_flags;
 168         __u16 segsize;
 169         __u16 segnum;
 170         __u16 xmit_count;
 171         unsigned long stamp;
 172         int iif;
 173 };
 174
 175 static inline __le16 dn_eth2dn(unsigned char *ethaddr)
 176 {
 177         return get_unaligned((__le16 *)(ethaddr + 4));
 178 }
 179
 180 static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
 181 {
 182         return *(__le16 *)saddr->sdn_nodeaddr;
 183 }
 184
 185 static inline void dn_dn2eth(unsigned char *ethaddr, __le16 addr)
 186 {
 187         __u16 a = le16_to_cpu(addr);
 188         ethaddr[0] = 0xAA;
 189         ethaddr[1] = 0x00;
 190         ethaddr[2] = 0x04;
 191         ethaddr[3] = 0x00;
 192         ethaddr[4] = (__u8)(a & 0xff);
 193         ethaddr[5] = (__u8)(a >> 8);
 194 }
 195
 196 static inline void dn_sk_ports_copy(struct flowidn *fld, struct dn_scp *scp)
 197 {
 198         fld->fld_sport = scp->addrloc;
 199         fld->fld_dport = scp->addrrem;
 200 }
 201
 202 extern unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu);
 203
 204 #define DN_MENUVER_ACC 0x01
 205 #define DN_MENUVER_USR 0x02
 206 #define DN_MENUVER_PRX 0x04
 207 #define DN_MENUVER_UIC 0x08
 208
 209 extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
 210 extern struct sock *dn_find_by_skb(struct sk_buff *skb);
 211 #define DN_ASCBUF_LEN 9
 212 extern char *dn_addr2asc(__u16, char *);
 213 extern int dn_destroy_timer(struct sock *sk);
 214
 215 extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
 216 extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
 217
 218 extern void dn_start_slow_timer(struct sock *sk);
 219 extern void dn_stop_slow_timer(struct sock *sk);
 220
 221 extern __le16 decnet_address;
 222 extern int decnet_debug_level;
 223 extern int decnet_time_wait;
 224 extern int decnet_dn_count;
 225 extern int decnet_di_count;
 226 extern int decnet_dr_count;
 227 extern int decnet_no_fc_max_cwnd;
 228
 229 extern long sysctl_decnet_mem[3];
 230 extern int sysctl_decnet_wmem[3];
 231 extern int sysctl_decnet_rmem[3];
 232
 233 #endif /* _NET_DN_H */