mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Robert Shearman](/assets/img/avatar_default.png)
The lwt implementations using net devices can autoload using the existing mechanism using IFLA_INFO_KIND. However, there's no mechanism that lwt modules not using net devices can use. Therefore, add the ability to autoload modules registering lwt operations for lwt implementations not using a net device so that users don't have to manually load the modules. Only users with the CAP_NET_ADMIN capability can cause modules to be loaded, which is ensured by rtnetlink_rcv_msg rejecting non-RTM_GETxxx messages for users without this capability, and by lwtunnel_build_state not being called in response to RTM_GETxxx messages. Signed-off-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
#ifndef __NET_LWTUNNEL_H
|
|
#define __NET_LWTUNNEL_H 1
|
|
|
|
#include <linux/lwtunnel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/types.h>
|
|
#include <net/route.h>
|
|
|
|
#define LWTUNNEL_HASH_BITS 7
|
|
#define LWTUNNEL_HASH_SIZE (1 << LWTUNNEL_HASH_BITS)
|
|
|
|
/* lw tunnel state flags */
|
|
#define LWTUNNEL_STATE_OUTPUT_REDIRECT BIT(0)
|
|
#define LWTUNNEL_STATE_INPUT_REDIRECT BIT(1)
|
|
|
|
struct lwtunnel_state {
|
|
__u16 type;
|
|
__u16 flags;
|
|
atomic_t refcnt;
|
|
int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
|
|
int (*orig_input)(struct sk_buff *);
|
|
int len;
|
|
__u8 data[0];
|
|
};
|
|
|
|
struct lwtunnel_encap_ops {
|
|
int (*build_state)(struct net_device *dev, struct nlattr *encap,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **ts);
|
|
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
|
|
int (*input)(struct sk_buff *skb);
|
|
int (*fill_encap)(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate);
|
|
int (*get_encap_size)(struct lwtunnel_state *lwtstate);
|
|
int (*cmp_encap)(struct lwtunnel_state *a, struct lwtunnel_state *b);
|
|
};
|
|
|
|
#ifdef CONFIG_LWTUNNEL
|
|
static inline void lwtstate_free(struct lwtunnel_state *lws)
|
|
{
|
|
kfree(lws);
|
|
}
|
|
|
|
static inline struct lwtunnel_state *
|
|
lwtstate_get(struct lwtunnel_state *lws)
|
|
{
|
|
if (lws)
|
|
atomic_inc(&lws->refcnt);
|
|
|
|
return lws;
|
|
}
|
|
|
|
static inline void lwtstate_put(struct lwtunnel_state *lws)
|
|
{
|
|
if (!lws)
|
|
return;
|
|
|
|
if (atomic_dec_and_test(&lws->refcnt))
|
|
lwtstate_free(lws);
|
|
}
|
|
|
|
static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
|
|
{
|
|
if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_OUTPUT_REDIRECT))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
|
|
{
|
|
if (lwtstate && (lwtstate->flags & LWTUNNEL_STATE_INPUT_REDIRECT))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
|
|
unsigned int num);
|
|
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
|
|
unsigned int num);
|
|
int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
|
|
struct nlattr *encap,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **lws);
|
|
int lwtunnel_fill_encap(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate);
|
|
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
|
|
struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
|
|
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
|
|
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
|
|
int lwtunnel_input(struct sk_buff *skb);
|
|
|
|
#else
|
|
|
|
static inline void lwtstate_free(struct lwtunnel_state *lws)
|
|
{
|
|
}
|
|
|
|
static inline struct lwtunnel_state *
|
|
lwtstate_get(struct lwtunnel_state *lws)
|
|
{
|
|
return lws;
|
|
}
|
|
|
|
static inline void lwtstate_put(struct lwtunnel_state *lws)
|
|
{
|
|
}
|
|
|
|
static inline bool lwtunnel_output_redirect(struct lwtunnel_state *lwtstate)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool lwtunnel_input_redirect(struct lwtunnel_state *lwtstate)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op,
|
|
unsigned int num)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,
|
|
unsigned int num)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int lwtunnel_build_state(struct net_device *dev, u16 encap_type,
|
|
struct nlattr *encap,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **lws)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int lwtunnel_fill_encap(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
|
|
struct lwtunnel_state *b)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int lwtunnel_input(struct sk_buff *skb)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#endif /* CONFIG_LWTUNNEL */
|
|
|
|
#define MODULE_ALIAS_RTNL_LWT(encap_type) MODULE_ALIAS("rtnl-lwt-" __stringify(encap_type))
|
|
|
|
#endif /* __NET_LWTUNNEL_H */
|