include/net/dn.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_DN_H
   3 #define _NET_DN_H
   4
   5 #include <linux/dn.h>
   6 #include <net/sock.h>
   7 #include <net/flow.h>
   8 #include <asm/byteorder.h>
   9 #include <asm/unaligned.h>
  10
  11 struct dn_scp                                   /* Session Control Port */
  12 {
  13         unsigned char           state;
  14 #define DN_O     1                      /* Open                 */
  15 #define DN_CR    2                      /* Connect Receive      */
  16 #define DN_DR    3                      /* Disconnect Reject    */
  17 #define DN_DRC   4                      /* Discon. Rej. Complete*/
  18 #define DN_CC    5                      /* Connect Confirm      */
  19 #define DN_CI    6                      /* Connect Initiate     */
  20 #define DN_NR    7                      /* No resources         */
  21 #define DN_NC    8                      /* No communication     */
  22 #define DN_CD    9                      /* Connect Delivery     */
  23 #define DN_RJ    10                     /* Rejected             */
  24 #define DN_RUN   11                     /* Running              */
  25 #define DN_DI    12                     /* Disconnect Initiate  */
  26 #define DN_DIC   13                     /* Disconnect Complete  */
  27 #define DN_DN    14                     /* Disconnect Notificat */
  28 #define DN_CL    15                     /* Closed               */
  29 #define DN_CN    16                     /* Closed Notification  */
  30
  31         __le16          addrloc;
  32         __le16          addrrem;
  33         __u16          numdat;
  34         __u16          numoth;
  35         __u16          numoth_rcv;
  36         __u16          numdat_rcv;
  37         __u16          ackxmt_dat;
  38         __u16          ackxmt_oth;
  39         __u16          ackrcv_dat;
  40         __u16          ackrcv_oth;
  41         __u8           flowrem_sw;
  42         __u8           flowloc_sw;
  43 #define DN_SEND         2
  44 #define DN_DONTSEND     1
  45 #define DN_NOCHANGE     0
  46         __u16           flowrem_dat;
  47         __u16           flowrem_oth;
  48         __u16           flowloc_dat;
  49         __u16           flowloc_oth;
  50         __u8            services_rem;
  51         __u8            services_loc;
  52         __u8            info_rem;
  53         __u8            info_loc;
  54
  55         __u16           segsize_rem;
  56         __u16           segsize_loc;
  57
  58         __u8            nonagle;
  59         __u8            multi_ireq;
  60         __u8            accept_mode;
  61         unsigned long           seg_total; /* Running total of current segment */
  62
  63         struct optdata_dn     conndata_in;
  64         struct optdata_dn     conndata_out;
  65         struct optdata_dn     discdata_in;
  66         struct optdata_dn     discdata_out;
  67         struct accessdata_dn  accessdata;
  68
  69         struct sockaddr_dn addr; /* Local address  */
  70         struct sockaddr_dn peer; /* Remote address */
  71
  72         /*
  73          * In this case the RTT estimation is not specified in the
  74          * docs, nor is any back off algorithm. Here we follow well
  75          * known tcp algorithms with a few small variations.
  76          *
  77          * snd_window: Max number of packets we send before we wait for
  78          *             an ack to come back. This will become part of a
  79          *             more complicated scheme when we support flow
  80          *             control.
  81          *
  82          * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
  83          *             average.
  84          * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
  85          *             varience of the smoothed average (but calculated in
  86          *             a simpler way than for normal statistical varience
  87          *             calculations).
  88          *
  89          * nsp_rxtshift: Backoff counter. Value is zero normally, each time
  90          *               a packet is lost is increases by one until an ack
  91          *               is received. Its used to index an array of backoff
  92          *               multipliers.
  93          */
  94 #define NSP_MIN_WINDOW 1
  95 #define NSP_MAX_WINDOW (0x07fe)
  96         unsigned long max_window;
  97         unsigned long snd_window;
  98 #define NSP_INITIAL_SRTT (HZ)
  99         unsigned long nsp_srtt;
 100 #define NSP_INITIAL_RTTVAR (HZ*3)
 101         unsigned long nsp_rttvar;
 102 #define NSP_MAXRXTSHIFT 12
 103         unsigned long nsp_rxtshift;
 104
 105         /*
 106          * Output queues, one for data, one for otherdata/linkservice
 107          */
 108         struct sk_buff_head data_xmit_queue;
 109         struct sk_buff_head other_xmit_queue;
 110
 111         /*
 112          * Input queue for other data
 113          */
 114         struct sk_buff_head other_receive_queue;
 115         int other_report;
 116
 117         /*
 118          * Stuff to do with the slow timer
 119          */
 120         unsigned long stamp;          /* time of last transmit */
 121         unsigned long persist;
 122         int (*persist_fxn)(struct sock *sk);
 123         unsigned long keepalive;
 124         void (*keepalive_fxn)(struct sock *sk);
 125
 126 };
 127
 128 static inline struct dn_scp *DN_SK(struct sock *sk)
 129 {
 130         return (struct dn_scp *)(sk + 1);
 131 }
 132
 133 /*
 134  * src,dst : Source and Destination DECnet addresses
 135  * hops : Number of hops through the network
 136  * dst_port, src_port : NSP port numbers
 137  * services, info : Useful data extracted from conninit messages
 138  * rt_flags : Routing flags byte
 139  * nsp_flags : NSP layer flags byte
 140  * segsize : Size of segment
 141  * segnum : Number, for data, otherdata and linkservice
 142  * xmit_count : Number of times we've transmitted this skb
 143  * stamp : Time stamp of most recent transmission, used in RTT calculations
 144  * iif: Input interface number
 145  *
 146  * As a general policy, this structure keeps all addresses in network
 147  * byte order, and all else in host byte order. Thus dst, src, dst_port
 148  * and src_port are in network order. All else is in host order.
 149  *
 150  */
 151 #define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
 152 struct dn_skb_cb {
 153         __le16 dst;
 154         __le16 src;
 155         __u16 hops;
 156         __le16 dst_port;
 157         __le16 src_port;
 158         __u8 services;
 159         __u8 info;
 160         __u8 rt_flags;
 161         __u8 nsp_flags;
 162         __u16 segsize;
 163         __u16 segnum;
 164         __u16 xmit_count;
 165         unsigned long stamp;
 166         int iif;
 167 };
 168
 169 static inline __le16 dn_eth2dn(unsigned char *ethaddr)
 170 {
 171         return get_unaligned((__le16 *)(ethaddr + 4));
 172 }
 173
 174 static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
 175 {
 176         return *(__le16 *)saddr->sdn_nodeaddr;
 177 }
 178
 179 static inline void dn_dn2eth(unsigned char *ethaddr, __le16 addr)
 180 {
 181         __u16 a = le16_to_cpu(addr);
 182         ethaddr[0] = 0xAA;
 183         ethaddr[1] = 0x00;
 184         ethaddr[2] = 0x04;
 185         ethaddr[3] = 0x00;
 186         ethaddr[4] = (__u8)(a & 0xff);
 187         ethaddr[5] = (__u8)(a >> 8);
 188 }
 189
 190 static inline void dn_sk_ports_copy(struct flowidn *fld, struct dn_scp *scp)
 191 {
 192         fld->fld_sport = scp->addrloc;
 193         fld->fld_dport = scp->addrrem;
 194 }
 195
 196 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu);
 197 void dn_register_sysctl(void);
 198 void dn_unregister_sysctl(void);
 199
 200 #define DN_MENUVER_ACC 0x01
 201 #define DN_MENUVER_USR 0x02
 202 #define DN_MENUVER_PRX 0x04
 203 #define DN_MENUVER_UIC 0x08
 204
 205 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
 206 struct sock *dn_find_by_skb(struct sk_buff *skb);
 207 #define DN_ASCBUF_LEN 9
 208 char *dn_addr2asc(__u16, char *);
 209 int dn_destroy_timer(struct sock *sk);
 210
 211 int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf,
 212                          unsigned char type);
 213 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr,
 214                          unsigned char *type);
 215
 216 void dn_start_slow_timer(struct sock *sk);
 217 void dn_stop_slow_timer(struct sock *sk);
 218
 219 extern __le16 decnet_address;
 220 extern int decnet_debug_level;
 221 extern int decnet_time_wait;
 222 extern int decnet_dn_count;
 223 extern int decnet_di_count;
 224 extern int decnet_dr_count;
 225 extern int decnet_no_fc_max_cwnd;
 226
 227 extern long sysctl_decnet_mem[3];
 228 extern int sysctl_decnet_wmem[3];
 229 extern int sysctl_decnet_rmem[3];
 230
 231 #endif /* _NET_DN_H */