aboutsummaryrefslogtreecommitdiff
path: root/include/net/dn_dev.h
blob: 197886cd7bddad9a5099ce590c64569fdd619753 (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
#ifndef _NET_DN_DEV_H
#define _NET_DN_DEV_H


struct dn_dev;

struct dn_ifaddr {
	struct dn_ifaddr __rcu *ifa_next;
	struct dn_dev    *ifa_dev;
	__le16            ifa_local;
	__le16            ifa_address;
	__u32             ifa_flags;
	__u8              ifa_scope;
	char              ifa_label[IFNAMSIZ];
	struct rcu_head   rcu;
};

#define DN_DEV_S_RU  0 /* Run - working normally   */
#define DN_DEV_S_CR  1 /* Circuit Rejected         */
#define DN_DEV_S_DS  2 /* Data Link Start          */
#define DN_DEV_S_RI  3 /* Routing Layer Initialize */
#define DN_DEV_S_RV  4 /* Routing Layer Verify     */
#define DN_DEV_S_RC  5 /* Routing Layer Complete   */
#define DN_DEV_S_OF  6 /* Off                      */
#define DN_DEV_S_HA  7 /* Halt                     */


/*
 * The dn_dev_parms structure contains the set of parameters
 * for each device (hence inclusion in the dn_dev structure)
 * and an array is used to store the default types of supported
 * device (in dn_dev.c).
 *
 * The type field matches the ARPHRD_ constants and is used in
 * searching the list for supported devices when new devices
 * come up.
 *
 * The mode field is used to find out if a device is broadcast,
 * multipoint, or pointopoint. Please note that DECnet thinks
 * different ways about devices to the rest of the kernel
 * so the normal IFF_xxx flags are invalid here. For devices
 * which can be any combination of the previously mentioned
 * attributes, you can set this on a per device basis by
 * installing an up() routine.
 *
 * The device state field, defines the initial state in which the
 * device will come up. In the dn_dev structure, it is the actual
 * state.
 *
 * Things have changed here. I've killed timer1 since it's a user space
 * issue for a user space routing deamon to sort out. The kernel does
 * not need to be bothered with it.
 *
 * Timers:
 * t2 - Rate limit timer, min time between routing and hello messages
 * t3 - Hello timer, send hello messages when it expires
 *
 * Callbacks:
 * up() - Called to initialize device, return value can veto use of
 *        device with DECnet.
 * down() - Called to turn device off when it goes down
 * timer3() - Called once for each ifaddr when timer 3 goes off
 * 
 * sysctl - Hook for sysctl things
 *
 */
struct dn_dev_parms {
	int type;	          /* ARPHRD_xxx                         */
	int mode;	          /* Broadcast, Unicast, Mulitpoint     */
#define DN_DEV_BCAST  1
#define DN_DEV_UCAST  2
#define DN_DEV_MPOINT 4
	int state;                /* Initial state                      */
	int forwarding;	          /* 0=EndNode, 1=L1Router, 2=L2Router  */
	unsigned long t2;         /* Default value of t2                */
	unsigned long t3;         /* Default value of t3                */
	int priority;             /* Priority to be a router            */
	char *name;               /* Name for sysctl                    */
	int  (*up)(struct net_device *);
	void (*down)(struct net_device *);
	void (*timer3)(struct net_device *, struct dn_ifaddr *ifa);
	void *sysctl;
};


struct dn_dev {
	struct dn_ifaddr __rcu *ifa_list;
	struct net_device *dev;
	struct dn_dev_parms parms;
	char use_long;
	struct timer_list timer;
	unsigned long t3;
	struct neigh_parms *neigh_parms;
	__u8 addr[ETH_ALEN];
	struct neighbour *router; /* Default router on circuit */
	struct neighbour *peer;   /* Peer on pointopoint links */
	unsigned long uptime;     /* Time device went up in jiffies */
};

struct dn_short_packet {
	__u8    msgflg;
	__le16 dstnode;
	__le16 srcnode;
	__u8   forward;
} __packed;

struct dn_long_packet {
	__u8   msgflg;
	__u8   d_area;
	__u8   d_subarea;
	__u8   d_id[6];
	__u8   s_area;
	__u8   s_subarea;
	__u8   s_id[6];
	__u8   nl2;
	__u8   visit_ct;
	__u8   s_class;
	__u8   pt;
} __packed;

/*------------------------- DRP - Routing messages ---------------------*/

struct endnode_hello_message {
	__u8   msgflg;
	__u8   tiver[3];
	__u8   id[6];
	__u8   iinfo;
	__le16 blksize;
	__u8   area;
	__u8   seed[8];
	__u8   neighbor[6];
	__le16 timer;
	__u8   mpd;
	__u8   datalen;
	__u8   data[2];
} __packed;

struct rtnode_hello_message {
	__u8   msgflg;
	__u8   tiver[3];
	__u8   id[6];
	__u8   iinfo;
	__le16  blksize;
	__u8   priority;
	__u8   area;
	__le16  timer;
	__u8   mpd;
} __packed;


void dn_dev_init(void);
void dn_dev_cleanup(void);

int dn_dev_ioctl(unsigned int cmd, void __user *arg);

void dn_dev_devices_off(void);
void dn_dev_devices_on(void);

void dn_dev_init_pkt(struct sk_buff *skb);
void dn_dev_veri_pkt(struct sk_buff *skb);
void dn_dev_hello(struct sk_buff *skb);

void dn_dev_up(struct net_device *);
void dn_dev_down(struct net_device *);

int dn_dev_set_default(struct net_device *dev, int force);
struct net_device *dn_dev_get_default(void);
int dn_dev_bind_default(__le16 *addr);

int register_dnaddr_notifier(struct notifier_block *nb);
int unregister_dnaddr_notifier(struct notifier_block *nb);

static inline int dn_dev_islocal(struct net_device *dev, __le16 addr)
{
	struct dn_dev *dn_db;
	struct dn_ifaddr *ifa;
	int res = 0;

	rcu_read_lock();
	dn_db = rcu_dereference(dev->dn_ptr);
	if (dn_db == NULL) {
		printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device\n");
		goto out;
	}

	for (ifa = rcu_dereference(dn_db->ifa_list);
	     ifa != NULL;
	     ifa = rcu_dereference(ifa->ifa_next))
		if ((addr ^ ifa->ifa_local) == 0) {
			res = 1;
			break;
		}
out:
	rcu_read_unlock();
	return res;
}

#endif /* _NET_DN_DEV_H */