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