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dn.h
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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 
10 struct 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 
42 #define DN_SEND 2
43 #define DN_DONTSEND 1
44 #define DN_NOCHANGE 0
53 
56 
60  unsigned long seg_total; /* Running total of current segment */
61 
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  */
109 
110  /*
111  * Input queue for other data
112  */
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  */
130  void (*delack_fxn)(struct sock *sk);
131 
132 };
133 
134 static 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)
158 struct dn_skb_cb {
171  unsigned long stamp;
172  int iif;
173 };
174 
175 static inline __le16 dn_eth2dn(unsigned char *ethaddr)
176 {
177  return get_unaligned((__le16 *)(ethaddr + 4));
178 }
179 
180 static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
181 {
182  return *(__le16 *)saddr->sdn_nodeaddr;
183 }
184 
185 static 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 
196 static 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 
202 extern unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu);
203 
204 #define DN_MENUVER_ACC 0x01
205 #define DN_MENUVER_USR 0x02
206 #define DN_MENUVER_PRX 0x04
207 #define DN_MENUVER_UIC 0x08
208 
209 extern struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr);
210 extern struct sock *dn_find_by_skb(struct sk_buff *skb);
211 #define DN_ASCBUF_LEN 9
212 extern char *dn_addr2asc(__u16, char *);
213 extern int dn_destroy_timer(struct sock *sk);
214 
215 extern int dn_sockaddr2username(struct sockaddr_dn *addr, unsigned char *buf, unsigned char type);
216 extern int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *addr, unsigned char *type);
217 
218 extern void dn_start_slow_timer(struct sock *sk);
219 extern void dn_stop_slow_timer(struct sock *sk);
220 
221 extern __le16 decnet_address;
222 extern int decnet_debug_level;
223 extern int decnet_time_wait;
224 extern int decnet_dn_count;
225 extern int decnet_di_count;
226 extern int decnet_dr_count;
227 extern int decnet_no_fc_max_cwnd;
228 
229 extern long sysctl_decnet_mem[3];
230 extern int sysctl_decnet_wmem[3];
231 extern int sysctl_decnet_rmem[3];
232 
233 #endif /* _NET_DN_H */