cregit-Linux how code gets into the kernel

Release 4.12 include/net/dn_dev.h

Directory: include/net
#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; }


Linus Torvalds (pre-git)6861.82%240.00%
Eric Dumazet4036.36%120.00%
Steven Whitehouse21.82%240.00%

#endif /* _NET_DN_DEV_H */

Overall Contributors

Linus Torvalds (pre-git)48776.09%325.00%
Steven Whitehouse9214.38%325.00%
Eric Dumazet507.81%216.67%
Jan Blunck81.25%18.33%
Steven Cole10.16%18.33%
Jiri Pirko10.16%18.33%
Al Viro10.16%18.33%
Directory: include/net
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