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dn_dev.h
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1 #ifndef _NET_DN_DEV_H
2 #define _NET_DN_DEV_H
3 
4 
5 struct dn_dev;
6 
7 struct dn_ifaddr {
9  struct dn_dev *ifa_dev;
15  struct rcu_head rcu;
16 };
17 
18 #define DN_DEV_S_RU 0 /* Run - working normally */
19 #define DN_DEV_S_CR 1 /* Circuit Rejected */
20 #define DN_DEV_S_DS 2 /* Data Link Start */
21 #define DN_DEV_S_RI 3 /* Routing Layer Initialize */
22 #define DN_DEV_S_RV 4 /* Routing Layer Verify */
23 #define DN_DEV_S_RC 5 /* Routing Layer Complete */
24 #define DN_DEV_S_OF 6 /* Off */
25 #define DN_DEV_S_HA 7 /* Halt */
26 
27 
28 /*
29  * The dn_dev_parms structure contains the set of parameters
30  * for each device (hence inclusion in the dn_dev structure)
31  * and an array is used to store the default types of supported
32  * device (in dn_dev.c).
33  *
34  * The type field matches the ARPHRD_ constants and is used in
35  * searching the list for supported devices when new devices
36  * come up.
37  *
38  * The mode field is used to find out if a device is broadcast,
39  * multipoint, or pointopoint. Please note that DECnet thinks
40  * different ways about devices to the rest of the kernel
41  * so the normal IFF_xxx flags are invalid here. For devices
42  * which can be any combination of the previously mentioned
43  * attributes, you can set this on a per device basis by
44  * installing an up() routine.
45  *
46  * The device state field, defines the initial state in which the
47  * device will come up. In the dn_dev structure, it is the actual
48  * state.
49  *
50  * Things have changed here. I've killed timer1 since it's a user space
51  * issue for a user space routing deamon to sort out. The kernel does
52  * not need to be bothered with it.
53  *
54  * Timers:
55  * t2 - Rate limit timer, min time between routing and hello messages
56  * t3 - Hello timer, send hello messages when it expires
57  *
58  * Callbacks:
59  * up() - Called to initialize device, return value can veto use of
60  * device with DECnet.
61  * down() - Called to turn device off when it goes down
62  * timer3() - Called once for each ifaddr when timer 3 goes off
63  *
64  * sysctl - Hook for sysctl things
65  *
66  */
67 struct dn_dev_parms {
68  int type; /* ARPHRD_xxx */
69  int mode; /* Broadcast, Unicast, Mulitpoint */
70 #define DN_DEV_BCAST 1
71 #define DN_DEV_UCAST 2
72 #define DN_DEV_MPOINT 4
73  int state; /* Initial state */
74  int forwarding; /* 0=EndNode, 1=L1Router, 2=L2Router */
75  unsigned long t2; /* Default value of t2 */
76  unsigned long t3; /* Default value of t3 */
77  int priority; /* Priority to be a router */
78  char *name; /* Name for sysctl */
79  int (*up)(struct net_device *);
80  void (*down)(struct net_device *);
81  void (*timer3)(struct net_device *, struct dn_ifaddr *ifa);
82  void *sysctl;
83 };
84 
85 
86 struct dn_dev {
88  struct net_device *dev;
90  char use_long;
91  struct timer_list timer;
92  unsigned long t3;
95  struct neighbour *router; /* Default router on circuit */
96  struct neighbour *peer; /* Peer on pointopoint links */
97  unsigned long uptime; /* Time device went up in jiffies */
98 };
99 
105 } __packed;
106 
111  __u8 d_id[6];
114  __u8 s_id[6];
119 } __packed;
120 
121 /*------------------------- DRP - Routing messages ---------------------*/
122 
126  __u8 id[6];
130  __u8 seed[8];
135  __u8 data[2];
136 } __packed;
137 
141  __u8 id[6];
148 } __packed;
149 
150 
151 extern void dn_dev_init(void);
152 extern void dn_dev_cleanup(void);
153 
154 extern int dn_dev_ioctl(unsigned int cmd, void __user *arg);
155 
156 extern void dn_dev_devices_off(void);
157 extern void dn_dev_devices_on(void);
158 
159 extern void dn_dev_init_pkt(struct sk_buff *skb);
160 extern void dn_dev_veri_pkt(struct sk_buff *skb);
161 extern void dn_dev_hello(struct sk_buff *skb);
162 
163 extern void dn_dev_up(struct net_device *);
164 extern void dn_dev_down(struct net_device *);
165 
166 extern int dn_dev_set_default(struct net_device *dev, int force);
167 extern struct net_device *dn_dev_get_default(void);
168 extern int dn_dev_bind_default(__le16 *addr);
169 
170 extern int register_dnaddr_notifier(struct notifier_block *nb);
171 extern int unregister_dnaddr_notifier(struct notifier_block *nb);
172 
173 static inline int dn_dev_islocal(struct net_device *dev, __le16 addr)
174 {
175  struct dn_dev *dn_db;
176  struct dn_ifaddr *ifa;
177  int res = 0;
178 
179  rcu_read_lock();
180  dn_db = rcu_dereference(dev->dn_ptr);
181  if (dn_db == NULL) {
182  printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device\n");
183  goto out;
184  }
185 
186  for (ifa = rcu_dereference(dn_db->ifa_list);
187  ifa != NULL;
188  ifa = rcu_dereference(ifa->ifa_next))
189  if ((addr ^ ifa->ifa_local) == 0) {
190  res = 1;
191  break;
192  }
193 out:
194  rcu_read_unlock();
195  return res;
196 }
197 
198 #endif /* _NET_DN_DEV_H */