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
10struct 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
134static 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)
158struct 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
175static inline __le16 dn_eth2dn(unsigned char *ethaddr)
176{
177	return get_unaligned((__le16 *)(ethaddr + 4));
178}
179
180static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
181{
182	return *(__le16 *)saddr->sdn_nodeaddr;
183}
184
185static 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
196static 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
202unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu);
203void dn_register_sysctl(void);
204void dn_unregister_sysctl(void);
205
206#define DN_MENUVER_ACC 0x01
207#define DN_MENUVER_USR 0x02
208#define DN_MENUVER_PRX 0x04
209#define DN_MENUVER_UIC 0x08
210
211struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
212struct sock *dn_find_by_skb(struct sk_buff *skb);
213#define DN_ASCBUF_LEN 9
214char *dn_addr2asc(__u16, char *);
215int dn_destroy_timer(struct sock *sk);
216
217int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf,
218			 unsigned char type);
219int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr,
220			 unsigned char *type);
221
222void dn_start_slow_timer(struct sock *sk);
223void dn_stop_slow_timer(struct sock *sk);
224
225extern __le16 decnet_address;
226extern int decnet_debug_level;
227extern int decnet_time_wait;
228extern int decnet_dn_count;
229extern int decnet_di_count;
230extern int decnet_dr_count;
231extern int decnet_no_fc_max_cwnd;
232
233extern long sysctl_decnet_mem[3];
234extern int sysctl_decnet_wmem[3];
235extern int sysctl_decnet_rmem[3];
236
237#endif /* _NET_DN_H */
238