aboutsummaryrefslogtreecommitdiff
path: root/include/net/dn.h
blob: c1dbbd22279394863d3d7cb7d8b7ed948e8bcfa7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
#ifndef _NET_DN_H
#define _NET_DN_H

#include <linux/dn.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <asm/byteorder.h>

typedef unsigned short dn_address;

#define dn_ntohs(x) le16_to_cpu((unsigned short)(x))
#define dn_htons(x) cpu_to_le16((unsigned short)(x))

struct dn_scp                                   /* Session Control Port */
{
        unsigned char           state;
#define DN_O     1                      /* Open                 */
#define DN_CR    2                      /* Connect Receive      */
#define DN_DR    3                      /* Disconnect Reject    */
#define DN_DRC   4                      /* Discon. Rej. Complete*/
#define DN_CC    5                      /* Connect Confirm      */
#define DN_CI    6                      /* Connect Initiate     */
#define DN_NR    7                      /* No resources         */
#define DN_NC    8                      /* No communication     */
#define DN_CD    9                      /* Connect Delivery     */
#define DN_RJ    10                     /* Rejected             */
#define DN_RUN   11                     /* Running              */
#define DN_DI    12                     /* Disconnect Initiate  */
#define DN_DIC   13                     /* Disconnect Complete  */
#define DN_DN    14                     /* Disconnect Notificat */
#define DN_CL    15                     /* Closed               */
#define DN_CN    16                     /* Closed Notification  */

        unsigned short          addrloc;
        unsigned short          addrrem;
        unsigned short          numdat;
        unsigned short          numoth;
        unsigned short          numoth_rcv;
        unsigned short          numdat_rcv;
        unsigned short          ackxmt_dat;
        unsigned short          ackxmt_oth;
        unsigned short          ackrcv_dat;
        unsigned short          ackrcv_oth;
        unsigned char           flowrem_sw;
	unsigned char		flowloc_sw;
#define DN_SEND         2
#define DN_DONTSEND     1
#define DN_NOCHANGE     0
	unsigned short		flowrem_dat;
	unsigned short		flowrem_oth;
	unsigned short		flowloc_dat;
	unsigned short		flowloc_oth;
	unsigned char		services_rem;
	unsigned char		services_loc;
	unsigned char		info_rem;
	unsigned char		info_loc;

	unsigned short		segsize_rem;
	unsigned short		segsize_loc;

	unsigned char		nonagle;
	unsigned char		multi_ireq;
	unsigned char		accept_mode;
	unsigned long		seg_total; /* Running total of current segment */

	struct optdata_dn     conndata_in;
	struct optdata_dn     conndata_out;
	struct optdata_dn     discdata_in;
	struct optdata_dn     discdata_out;
        struct accessdata_dn  accessdata;

        struct sockaddr_dn addr; /* Local address  */
	struct sockaddr_dn peer; /* Remote address */

	/*
	 * In this case the RTT estimation is not specified in the
	 * docs, nor is any back off algorithm. Here we follow well
	 * known tcp algorithms with a few small variations.
	 *
	 * snd_window: Max number of packets we send before we wait for
	 *             an ack to come back. This will become part of a
	 *             more complicated scheme when we support flow
	 *             control.
	 *
	 * nsp_srtt:   Round-Trip-Time (x8) in jiffies. This is a rolling
	 *             average.
	 * nsp_rttvar: Round-Trip-Time-Varience (x4) in jiffies. This is the
	 *             varience of the smoothed average (but calculated in
	 *             a simpler way than for normal statistical varience
	 *             calculations).
	 *
	 * nsp_rxtshift: Backoff counter. Value is zero normally, each time
	 *               a packet is lost is increases by one until an ack
	 *               is received. Its used to index an array of backoff
	 *               multipliers.
	 */
#define NSP_MIN_WINDOW 1
#define NSP_MAX_WINDOW (0x07fe)
	unsigned long max_window;
	unsigned long snd_window;
#define NSP_INITIAL_SRTT (HZ)
	unsigned long nsp_srtt;
#define NSP_INITIAL_RTTVAR (HZ*3)
	unsigned long nsp_rttvar;
#define NSP_MAXRXTSHIFT 12
	unsigned long nsp_rxtshift;

	/*
	 * Output queues, one for data, one for otherdata/linkservice
	 */
	struct sk_buff_head data_xmit_queue;
	struct sk_buff_head other_xmit_queue;

	/*
	 * Input queue for other data
	 */
	struct sk_buff_head other_receive_queue;
	int other_report;

	/*
	 * Stuff to do with the slow timer
	 */
	unsigned long stamp;          /* time of last transmit */
	unsigned long persist;
	int (*persist_fxn)(struct sock *sk);
	unsigned long keepalive;
	void (*keepalive_fxn)(struct sock *sk);

	/*
	 * This stuff is for the fast timer for delayed acks
	 */
	struct timer_list delack_timer;
	int delack_pending;
	void (*delack_fxn)(struct sock *sk);

};

static inline struct dn_scp *DN_SK(struct sock *sk)
{
	return (struct dn_scp *)(sk + 1);
}

/*
 * src,dst : Source and Destination DECnet addresses
 * hops : Number of hops through the network
 * dst_port, src_port : NSP port numbers
 * services, info : Useful data extracted from conninit messages
 * rt_flags : Routing flags byte
 * nsp_flags : NSP layer flags byte
 * segsize : Size of segment
 * segnum : Number, for data, otherdata and linkservice
 * xmit_count : Number of times we've transmitted this skb
 * stamp : Time stamp of most recent transmission, used in RTT calculations
 * iif: Input interface number
 *
 * As a general policy, this structure keeps all addresses in network
 * byte order, and all else in host byte order. Thus dst, src, dst_port
 * and src_port are in network order. All else is in host order.
 * 
 */
#define DN_SKB_CB(skb) ((struct dn_skb_cb *)(skb)->cb)
struct dn_skb_cb {
	unsigned short dst;
	unsigned short src;
	unsigned short hops;
	unsigned short dst_port;
	unsigned short src_port;
	unsigned char services;
	unsigned char info;
	unsigned char rt_flags;
	unsigned char nsp_flags;
	unsigned short segsize;
	unsigned short segnum;
	unsigned short xmit_count;
	unsigned long stamp;
	int iif;
};

static inline dn_address dn_eth2dn(unsigned char *ethaddr)
{
	return ethaddr[4] | (ethaddr[5] << 8);
}

static inline dn_address dn_saddr2dn(struct sockaddr_dn *saddr)
{
	return *(dn_address *)saddr->sdn_nodeaddr;
}

static inline void dn_dn2eth(unsigned char *ethaddr, dn_address addr)
{
	ethaddr[0] = 0xAA;
	ethaddr[1] = 0x00;
	ethaddr[2] = 0x04;
	ethaddr[3] = 0x00;
	ethaddr[4] = (unsigned char)(addr & 0xff);
	ethaddr[5] = (unsigned char)(addr >> 8);
}

static inline void dn_sk_ports_copy(struct flowi *fl, struct dn_scp *scp)
{
	fl->uli_u.dnports.sport = scp->addrloc;
	fl->uli_u.dnports.dport = scp->addrrem;
	fl->uli_u.dnports.objnum = scp->addr.sdn_objnum;
	if (fl->uli_u.dnports.objnum == 0) {
		fl->uli_u.dnports.objnamel = scp->addr.sdn_objnamel;
		memcpy(fl->uli_u.dnports.objname, scp->addr.sdn_objname, 16);
	}
}

extern unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu);

#define DN_MENUVER_ACC 0x01
#define DN_MENUVER_USR 0x02
#define DN_MENUVER_PRX 0x04
#define DN_MENUVER_UIC 0x08

extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
extern struct sock *dn_find_by_skb(struct sk_buff *skb);
#define DN_ASCBUF_LEN 9
extern char *dn_addr2asc(dn_address, char *);
extern int dn_destroy_timer(struct sock *sk);

extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);

extern void dn_start_slow_timer(struct sock *sk);
extern void dn_stop_slow_timer(struct sock *sk);

extern dn_address decnet_address;
extern int decnet_debug_level;
extern int decnet_time_wait;
extern int decnet_dn_count;
extern int decnet_di_count;
extern int decnet_dr_count;
extern int decnet_no_fc_max_cwnd;

#endif /* _NET_DN_H */