cregit-Linux how code gets into the kernel

Release 4.12 include/linux/concap.h

Directory: include/linux
/* $Id: concap.h,v 2004/01/12 23:08:35 keil Exp $
 * Copyright 1997 by Henner Eisen <>
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.



#include <linux/skbuff.h>
#include <linux/netdevice.h>

/* Stuff to support encapsulation protocols genericly. The encapsulation
   protocol is processed at the uppermost layer of the network interface.

   Based on a ideas developed in a 'synchronous device' thread in the
   linux-x25 mailing list contributed by Alan Cox, Thomasz Motylewski
   and Jonathan Naylor.

   For more documetation on this refer to Documentation/isdn/README.concap

struct concap_proto_ops;
struct concap_device_ops;

/* this manages all data needed by the encapsulation protocol

struct concap_proto{
struct net_device *net_dev;	/* net device using our service  */
struct concap_device_ops *dops;	/* callbacks provided by device */
struct concap_proto_ops  *pops;	/* callbacks provided by us */
spinlock_t lock;
int flags;
void *proto_data;		/* protocol specific private data, to
                                           be accessed via *pops methods only*/

/* Operations to be supported by the net device. Called by the encapsulation
 * protocol entity. No receive method is offered because the encapsulation
 * protocol directly calls netif_rx().

struct concap_device_ops{

	/* to request data is submitted by device*/ 
int (*data_req)(struct concap_proto *, struct sk_buff *);

	/* Control methods must be set to NULL by devices which do not
           support connection control.*/
	/* to request a connection is set up */ 
int (*connect_req)(struct concap_proto *);

	/* to request a connection is released */
int (*disconn_req)(struct concap_proto *);	

/* Operations to be supported by the encapsulation protocol. Called by
 * device driver.

struct concap_proto_ops{

	/* create a new encapsulation protocol instance of same type */
struct concap_proto *  (*proto_new) (void);

	/* delete encapsulation protocol instance and free all its resources.
           cprot may no loger be referenced after calling this */
void (*proto_del)(struct concap_proto *cprot);

	/* initialize the protocol's data. To be called at interface startup
           or when the device driver resets the interface. All services of the
           encapsulation protocol may be used after this*/
int (*restart)(struct concap_proto *cprot, 
		       struct net_device *ndev,
		       struct concap_device_ops *dops);

	/* inactivate an encapsulation protocol instance. The encapsulation
           protocol may not call any *dops methods after this. */
int (*close)(struct concap_proto *cprot);

	/* process a frame handed down to us by upper layer */
int (*encap_and_xmit)(struct concap_proto *cprot, struct sk_buff *skb);

	/* to be called for each data entity received from lower layer*/ 
int (*data_ind)(struct concap_proto *cprot, struct sk_buff *skb);

	/* to be called when a connection was set up/down.
           Protocols that don't process these primitives might fill in
           dummy methods here */
int (*connect_ind)(struct concap_proto *cprot);
int (*disconn_ind)(struct concap_proto *cprot);
    Some network device support functions, like net_header(), rebuild_header(),
    and others, that depend solely on the encapsulation protocol, might
    be provided here, too. The net device would just fill them in its
    corresponding fields when it is opened.

/* dummy restart/close/connect/reset/disconn methods
extern int concap_nop(struct concap_proto *cprot); 

/* dummy submit method
extern int concap_drop_skb(struct concap_proto *cprot, struct sk_buff *skb);

Overall Contributors

Linus Torvalds (pre-git)25698.08%250.00%
Andrew Morton41.53%125.00%
Linus Torvalds10.38%125.00%
Directory: include/linux
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