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 11struct 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 128static 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) 152struct 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 169static inline __le16 dn_eth2dn(unsigned char *ethaddr) 170{ 171 return get_unaligned((__le16 *)(ethaddr + 4)); 172} 173 174static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr) 175{ 176 return *(__le16 *)saddr->sdn_nodeaddr; 177} 178 179static 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 190static 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 196unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu); 197void dn_register_sysctl(void); 198void 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 205struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr); 206struct sock *dn_find_by_skb(struct sk_buff *skb); 207#define DN_ASCBUF_LEN 9 208char *dn_addr2asc(__u16, char *); 209int dn_destroy_timer(struct sock *sk); 210 211int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, 212 unsigned char type); 213int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, 214 unsigned char *type); 215 216void dn_start_slow_timer(struct sock *sk); 217void dn_stop_slow_timer(struct sock *sk); 218 219extern __le16 decnet_address; 220extern int decnet_debug_level; 221extern int decnet_time_wait; 222extern int decnet_dn_count; 223extern int decnet_di_count; 224extern int decnet_dr_count; 225extern int decnet_no_fc_max_cwnd; 226 227extern long sysctl_decnet_mem[3]; 228extern int sysctl_decnet_wmem[3]; 229extern int sysctl_decnet_rmem[3]; 230 231#endif /* _NET_DN_H */ 232