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/*
* Copyright (C) 2004, 2005 Mike Wray <mike.wray@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free software Foundation, Inc.,
* 59 Temple Place, suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __VNET_TUNNEL_H__
#define __VNET_TUNNEL_H__
#ifdef __KERNEL__
#include <linux/types.h>
#include <asm/atomic.h>
#else
//#include <linux/types.h>
#include "sys_kernel.h"
#include "spinlock.h"
#endif
#include <if_varp.h>
struct sk_buff;
struct Tunnel;
typedef struct TunnelType {
const char *name;
int (*open)(struct Tunnel *tunnel);
int (*send)(struct Tunnel *tunnel, struct sk_buff *skb);
void (*close)(struct Tunnel *tunnel);
} TunnelType;
typedef struct TunnelStats {
int bytes;
int packets;
int dropped_bytes;
int dropped_packets;
} TunnelStats;
typedef struct TunnelKey {
struct VnetId vnet;
struct VarpAddr addr;
} TunnelKey;
typedef struct Tunnel {
/** Key identifying the tunnel. Must be first. */
struct TunnelKey key;
/** Reference count. */
atomic_t refcount;
/** Tunnel type. */
struct TunnelType *type;
/** Statistics. */
struct TunnelStats send_stats;
/** Type-dependent state. */
void *data;
/** Underlying tunnel (may be null). */
struct Tunnel *base;
} Tunnel;
/** Decrement the reference count, freeing if zero.
*
* @param tunnel tunnel (may be null)
*/
static inline void Tunnel_decref(struct Tunnel *tunnel){
if(!tunnel) return;
if(atomic_dec_and_test(&tunnel->refcount)){
tunnel->type->close(tunnel);
Tunnel_decref(tunnel->base);
kfree(tunnel);
}
}
/** Increment the reference count.
*
* @param tunnel tunnel (may be null)
*/
static inline void Tunnel_incref(Tunnel *tunnel){
if(!tunnel) return;
atomic_inc(&tunnel->refcount);
}
extern int Tunnel_init(void);
extern int Tunnel_lookup(struct VnetId *vnet, struct VarpAddr *addr, struct Tunnel **tunnel);
extern int Tunnel_open(struct VnetId *vnet, struct VarpAddr *addr,
int (*ctor)(struct VnetId *vnet,
struct VarpAddr *addr,
struct Tunnel **ptunnel),
struct Tunnel **ptunnel);
extern int Tunnel_add(struct Tunnel *tunnel);
extern int Tunnel_del(struct Tunnel *tunnel);
extern void Tunnel_print(struct Tunnel *tunnel);
extern int Tunnel_send(struct Tunnel *tunnel, struct sk_buff *skb);
extern int Tunnel_create(struct TunnelType *type, struct VnetId *vnet, struct VarpAddr *addr,
struct Tunnel *base, struct Tunnel **tunnelp);
extern int tunnel_module_init(void);
extern void tunnel_module_exit(void);
#endif /* !__VNET_TUNNEL_H__ */
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