include/net/dn_dev.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_DN_DEV_H
   3 #define _NET_DN_DEV_H
   4
   5
   6 struct dn_dev;
   7
   8 struct dn_ifaddr {
   9         struct dn_ifaddr __rcu *ifa_next;
  10         struct dn_dev    *ifa_dev;
  11         __le16            ifa_local;
  12         __le16            ifa_address;
  13         __u32             ifa_flags;
  14         __u8              ifa_scope;
  15         char              ifa_label[IFNAMSIZ];
  16         struct rcu_head   rcu;
  17 };
  18
  19 #define DN_DEV_S_RU  0 /* Run - working normally   */
  20 #define DN_DEV_S_CR  1 /* Circuit Rejected         */
  21 #define DN_DEV_S_DS  2 /* Data Link Start          */
  22 #define DN_DEV_S_RI  3 /* Routing Layer Initialize */
  23 #define DN_DEV_S_RV  4 /* Routing Layer Verify     */
  24 #define DN_DEV_S_RC  5 /* Routing Layer Complete   */
  25 #define DN_DEV_S_OF  6 /* Off                      */
  26 #define DN_DEV_S_HA  7 /* Halt                     */
  27
  28
  29 /*
  30  * The dn_dev_parms structure contains the set of parameters
  31  * for each device (hence inclusion in the dn_dev structure)
  32  * and an array is used to store the default types of supported
  33  * device (in dn_dev.c).
  34  *
  35  * The type field matches the ARPHRD_ constants and is used in
  36  * searching the list for supported devices when new devices
  37  * come up.
  38  *
  39  * The mode field is used to find out if a device is broadcast,
  40  * multipoint, or pointopoint. Please note that DECnet thinks
  41  * different ways about devices to the rest of the kernel
  42  * so the normal IFF_xxx flags are invalid here. For devices
  43  * which can be any combination of the previously mentioned
  44  * attributes, you can set this on a per device basis by
  45  * installing an up() routine.
  46  *
  47  * The device state field, defines the initial state in which the
  48  * device will come up. In the dn_dev structure, it is the actual
  49  * state.
  50  *
  51  * Things have changed here. I've killed timer1 since it's a user space
  52  * issue for a user space routing deamon to sort out. The kernel does
  53  * not need to be bothered with it.
  54  *
  55  * Timers:
  56  * t2 - Rate limit timer, min time between routing and hello messages
  57  * t3 - Hello timer, send hello messages when it expires
  58  *
  59  * Callbacks:
  60  * up() - Called to initialize device, return value can veto use of
  61  *        device with DECnet.
  62  * down() - Called to turn device off when it goes down
  63  * timer3() - Called once for each ifaddr when timer 3 goes off
  64  *
  65  * sysctl - Hook for sysctl things
  66  *
  67  */
  68 struct dn_dev_parms {
  69         int type;                 /* ARPHRD_xxx                         */
  70         int mode;                 /* Broadcast, Unicast, Mulitpoint     */
  71 #define DN_DEV_BCAST  1
  72 #define DN_DEV_UCAST  2
  73 #define DN_DEV_MPOINT 4
  74         int state;                /* Initial state                      */
  75         int forwarding;           /* 0=EndNode, 1=L1Router, 2=L2Router  */
  76         unsigned long t2;         /* Default value of t2                */
  77         unsigned long t3;         /* Default value of t3                */
  78         int priority;             /* Priority to be a router            */
  79         char *name;               /* Name for sysctl                    */
  80         int  (*up)(struct net_device *);
  81         void (*down)(struct net_device *);
  82         void (*timer3)(struct net_device *, struct dn_ifaddr *ifa);
  83         void *sysctl;
  84 };
  85
  86
  87 struct dn_dev {
  88         struct dn_ifaddr __rcu *ifa_list;
  89         struct net_device *dev;
  90         struct dn_dev_parms parms;
  91         char use_long;
  92         struct timer_list timer;
  93         unsigned long t3;
  94         struct neigh_parms *neigh_parms;
  95         __u8 addr[ETH_ALEN];
  96         struct neighbour *router; /* Default router on circuit */
  97         struct neighbour *peer;   /* Peer on pointopoint links */
  98         unsigned long uptime;     /* Time device went up in jiffies */
  99 };
 100
 101 struct dn_short_packet {
 102         __u8    msgflg;
 103         __le16 dstnode;
 104         __le16 srcnode;
 105         __u8   forward;
 106 } __packed;
 107
 108 struct dn_long_packet {
 109         __u8   msgflg;
 110         __u8   d_area;
 111         __u8   d_subarea;
 112         __u8   d_id[6];
 113         __u8   s_area;
 114         __u8   s_subarea;
 115         __u8   s_id[6];
 116         __u8   nl2;
 117         __u8   visit_ct;
 118         __u8   s_class;
 119         __u8   pt;
 120 } __packed;
 121
 122 /*------------------------- DRP - Routing messages ---------------------*/
 123
 124 struct endnode_hello_message {
 125         __u8   msgflg;
 126         __u8   tiver[3];
 127         __u8   id[6];
 128         __u8   iinfo;
 129         __le16 blksize;
 130         __u8   area;
 131         __u8   seed[8];
 132         __u8   neighbor[6];
 133         __le16 timer;
 134         __u8   mpd;
 135         __u8   datalen;
 136         __u8   data[2];
 137 } __packed;
 138
 139 struct rtnode_hello_message {
 140         __u8   msgflg;
 141         __u8   tiver[3];
 142         __u8   id[6];
 143         __u8   iinfo;
 144         __le16  blksize;
 145         __u8   priority;
 146         __u8   area;
 147         __le16  timer;
 148         __u8   mpd;
 149 } __packed;
 150
 151
 152 void dn_dev_init(void);
 153 void dn_dev_cleanup(void);
 154
 155 int dn_dev_ioctl(unsigned int cmd, void __user *arg);
 156
 157 void dn_dev_devices_off(void);
 158 void dn_dev_devices_on(void);
 159
 160 void dn_dev_init_pkt(struct sk_buff *skb);
 161 void dn_dev_veri_pkt(struct sk_buff *skb);
 162 void dn_dev_hello(struct sk_buff *skb);
 163
 164 void dn_dev_up(struct net_device *);
 165 void dn_dev_down(struct net_device *);
 166
 167 int dn_dev_set_default(struct net_device *dev, int force);
 168 struct net_device *dn_dev_get_default(void);
 169 int dn_dev_bind_default(__le16 *addr);
 170
 171 int register_dnaddr_notifier(struct notifier_block *nb);
 172 int unregister_dnaddr_notifier(struct notifier_block *nb);
 173
 174 static inline int dn_dev_islocal(struct net_device *dev, __le16 addr)
 175 {
 176         struct dn_dev *dn_db;
 177         struct dn_ifaddr *ifa;
 178         int res = 0;
 179
 180         rcu_read_lock();
 181         dn_db = rcu_dereference(dev->dn_ptr);
 182         if (dn_db == NULL) {
 183                 printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device\n");
 184                 goto out;
 185         }
 186
 187         for (ifa = rcu_dereference(dn_db->ifa_list);
 188              ifa != NULL;
 189              ifa = rcu_dereference(ifa->ifa_next))
 190                 if ((addr ^ ifa->ifa_local) == 0) {
 191                         res = 1;
 192                         break;
 193                 }
 194 out:
 195         rcu_read_unlock();
 196         return res;
 197 }
 198
 199 #endif /* _NET_DN_DEV_H */