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/*
* Copyright (c) 2010 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
*/
#ifndef TUNNEL_H
#define TUNNEL_H 1
#include "openvswitch/tunnel.h"
#include "table.h"
#include "vport.h"
/*
* The absolute minimum fragment size. Note that there are many other
* definitions of the minimum MTU.
*/
#define IP_MIN_MTU 68
/*
* One of these goes in your struct tnl_ops and in tnl_find_port().
* These values are in the same namespace as other TNL_T_* values, so
* you have only the first 10 bits to define protocol identifiers.
*/
#define TNL_T_PROTO_GRE 0
#define TNL_T_PROTO_CAPWAP 1
/* You only need these flags when you are calling tnl_find_port(). */
#define TNL_T_KEY_EXACT (1 << 10)
#define TNL_T_KEY_MATCH (1 << 11)
#define TNL_T_KEY_EITHER (TNL_T_KEY_EXACT | TNL_T_KEY_MATCH)
struct tnl_mutable_config {
struct rcu_head rcu;
unsigned char eth_addr[ETH_ALEN];
unsigned int mtu;
struct tnl_port_config port_config;
/* Set of TNL_T_* flags that define the category for lookup. */
u32 tunnel_type;
int tunnel_hlen; /* Tunnel header length. */
};
struct tnl_ops {
/* Put your TNL_T_PROTO_* type in here. */
u32 tunnel_type;
u8 ipproto;
/*
* Returns the length of the tunnel header you will add in
* build_header() (i.e. excludes the IP header). Returns a negative
* error code if the configuration is invalid.
*/
int (*hdr_len)(const struct tnl_port_config *);
/*
* Returns a linked list of SKBs with tunnel headers (multiple
* packets may be generated in the event of fragmentation). Space
* will have already been allocated at the start of the packet equal
* to sizeof(struct iphdr) + value returned by hdr_len(). The IP
* header will have already been constructed.
*/
struct sk_buff *(*build_header)(struct sk_buff *,
const struct vport *,
const struct tnl_mutable_config *,
struct dst_entry *);
};
struct tnl_vport {
struct rcu_head rcu;
struct tbl_node tbl_node;
char name[IFNAMSIZ];
const struct tnl_ops *tnl_ops;
/* Protected by RCU. */
struct tnl_mutable_config *mutable;
atomic_t frag_id;
};
int tnl_init(void);
void tnl_exit(void);
struct vport *tnl_create(const char *name, const void __user *config,
const struct vport_ops *,
const struct tnl_ops *);
int tnl_modify(struct vport *, const void __user *config);
int tnl_destroy(struct vport *);
int tnl_set_mtu(struct vport *vport, int mtu);
int tnl_set_addr(struct vport *vport, const unsigned char *addr);
const char *tnl_get_name(const struct vport *vport);
const unsigned char *tnl_get_addr(const struct vport *vport);
int tnl_get_mtu(const struct vport *vport);
int tnl_send(struct vport *vport, struct sk_buff *skb);
void tnl_rcv(struct vport *vport, struct sk_buff *skb);
struct vport *tnl_find_port(__be32 saddr, __be32 daddr, __be32 key,
int tunnel_type,
const struct tnl_mutable_config **mutable);
bool tnl_frag_needed(struct vport *vport,
const struct tnl_mutable_config *mutable,
struct sk_buff *skb, unsigned int mtu, __be32 flow_key);
static inline struct tnl_vport *tnl_vport_priv(const struct vport *vport)
{
return vport_priv(vport);
}
#endif /* tunnel.h */
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