1 #ifndef _NET_DN_H
2 #define _NET_DN_H
3
4 #include <linux/dn.h>
5 #include <asm/byteorder.h>
6
7 typedef unsigned short dn_address;
8
9 #define dn_ntohs(x) le16_to_cpu((unsigned short)(x))
10 #define dn_htons(x) cpu_to_le16((unsigned short)(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 unsigned short addrloc;
33 unsigned short addrrem;
34 unsigned short numdat;
35 unsigned short numoth;
36 unsigned short numoth_rcv;
37 unsigned short numdat_rcv;
38 unsigned short ackxmt_dat;
39 unsigned short ackxmt_oth;
40 unsigned short ackrcv_dat;
41 unsigned short ackrcv_oth;
42 unsigned char flowrem_sw;
43 unsigned char flowloc_sw;
44 #define DN_SEND 2
45 #define DN_DONTSEND 1
46 #define DN_NOCHANGE 0
47 unsigned char accept_mode;
48 unsigned short mss;
49 unsigned long seg_size; /* Running total of current segment */
50
51 struct optdata_dn conndata_in;
52 struct optdata_dn conndata_out;
53 struct optdata_dn discdata_in;
54 struct optdata_dn discdata_out;
55 struct accessdata_dn accessdata;
56
57 struct sockaddr_dn addr; /* Local address */
58 struct sockaddr_dn peer; /* Remote address */
59
60 /*
61 * In this case the RTT estimation is not specified in the
62 * docs, nor is any back off algorithm. Here we follow well
63 * known tcp algorithms with a few small variations.
64 *
65 * snd_window: Max number of packets we send before we wait for
66 * an ack to come back. This will become part of a
67 * more complicated scheme when we support flow
68 * control.
69 *
70 * nsp_srtt: Round-Trip-Time (x8) in jiffies. This is a rolling
71 * average.
72 * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
73 * varience of the smoothed average (but calculated in
74 * a simpler way than for normal statistical varience
75 * calculations).
76 *
77 * nsp_rxtshift: Backoff counter. Value is zero normally, each time
78 * a packet is lost is increases by one until an ack
79 * is received. Its used to index an array of backoff
80 * multipliers.
81 */
82 #define NSP_MIN_WINDOW 1
83 #define NSP_MAX_WINDOW 512
84 unsigned long snd_window;
85 #define NSP_INITIAL_SRTT (HZ)
86 unsigned long nsp_srtt;
87 #define NSP_INITIAL_RTTVAR (HZ*3)
88 unsigned long nsp_rttvar;
89 #define NSP_MAXRXTSHIFT 12
90 unsigned long nsp_rxtshift;
91
92 /*
93 * Output queues, one for data, one for otherdata/linkservice
94 */
95 struct sk_buff_head data_xmit_queue;
96 struct sk_buff_head other_xmit_queue;
97
98 /*
99 * Input queue for other data
100 */
101 struct sk_buff_head other_receive_queue;
102 int other_report;
103
104 /*
105 * Stuff to do with the slow timer
106 */
107 unsigned long stamp; /* time of last transmit */
108 unsigned long persist;
109 int (*persist_fxn)(struct sock *sk);
110 unsigned long keepalive;
111 void (*keepalive_fxn)(struct sock *sk);
112
113 /*
114 * This stuff is for the fast timer for delayed acks
115 */
116 struct timer_list delack_timer;
117 int delack_pending;
118 void (*delack_fxn)(struct sock *sk);
119 };
120
121 /*
122 * src,dst : Source and Destination DECnet addresses
123 * hops : Number of hops through the network
124 * dst_port, src_port : NSP port numbers
125 * services, info : Useful data extracted from conninit messages
126 * rt_flags : Routing flags byte
127 * nsp_flags : NSP layer flags byte
128 * segsize : Size of segment
129 * segnum : Number, for data, otherdata and linkservice
130 * xmit_count : Number of times we've transmitted this skb
131 * stamp : Time stamp of first transmission, used in RTT calculations
132 * iif: Input interface number
133 *
134 * As a general policy, this structure keeps all addresses in network
135 * byte order, and all else in host byte order. Thus dst, src, dst_port
136 * and src_port are in network order. All else is in host order.
137 *
138 */
139 struct dn_skb_cb {
140 unsigned short dst;
141 unsigned short src;
142 unsigned short hops;
143 unsigned short dst_port;
144 unsigned short src_port;
145 unsigned char services;
146 unsigned char info;
147 unsigned char rt_flags;
148 unsigned char nsp_flags;
149 unsigned short segsize;
150 unsigned short segnum;
151 unsigned short xmit_count;
152 unsigned long stamp;
153 int iif;
154 };
155
156 static __inline__ dn_address dn_eth2dn(unsigned char *ethaddr)
157 {
158 return ethaddr[4] | (ethaddr[5] << 8);
159 }
160
161 static __inline__ dn_address dn_saddr2dn(struct sockaddr_dn *saddr)
162 {
163 return *(dn_address *)saddr->sdn_nodeaddr;
164 }
165
166 static __inline__ void dn_dn2eth(unsigned char *ethaddr, dn_address addr)
167 {
168 ethaddr[0] = 0xAA;
169 ethaddr[1] = 0x00;
170 ethaddr[2] = 0x04;
171 ethaddr[3] = 0x00;
172 ethaddr[4] = (unsigned char)(addr & 0xff);
173 ethaddr[5] = (unsigned char)(addr >> 8);
174 }
175
176 #define DN_MENUVER_ACC 0x01
177 #define DN_MENUVER_USR 0x02
178 #define DN_MENUVER_PRX 0x04
179 #define DN_MENUVER_UIC 0x08
180
181 extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
182 extern struct sock *dn_find_by_skb(struct sk_buff *skb);
183 #define DN_ASCBUF_LEN 9
184 extern char *dn_addr2asc(dn_address, char *);
185 extern int dn_destroy_timer(struct sock *sk);
186
187 extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
188 extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
189
190 extern void dn_start_slow_timer(struct sock *sk);
191 extern void dn_stop_slow_timer(struct sock *sk);
192 extern void dn_start_fast_timer(struct sock *sk);
193 extern void dn_stop_fast_timer(struct sock *sk);
194
195 extern dn_address decnet_address;
196 extern unsigned char decnet_ether_address[6];
197 extern int decnet_debug_level;
198 extern int decnet_time_wait;
199 extern int decnet_dn_count;
200 extern int decnet_di_count;
201 extern int decnet_dr_count;
202
203 #endif /* _NET_DN_H */
204
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