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
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
DN_SK(struct sock * sk)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 {
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
dn_eth2dn(unsigned char * ethaddr)175 static inline __le16 dn_eth2dn(unsigned char *ethaddr)
176 {
177 return get_unaligned((__le16 *)(ethaddr + 4));
178 }
179
dn_saddr2dn(struct sockaddr_dn * saddr)180 static inline __le16 dn_saddr2dn(struct sockaddr_dn *saddr)
181 {
182 return *(__le16 *)saddr->sdn_nodeaddr;
183 }
184
dn_dn2eth(unsigned char * ethaddr,__le16 addr)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
dn_sk_ports_copy(struct flowidn * fld,struct dn_scp * scp)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 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 */
234