xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

xfrm: Provide API to register translator module

Browse Source 
Add a skeleton for xfrm_compat module and provide API to register it in
xfrm_state.ko. struct xfrm_translator will have function pointers to
translate messages received from 32-bit userspace or to be sent to it
from 64-bit kernel.
module_get()/module_put() are used instead of rcu_read_lock() as the
module will vmalloc() memory for translation.
The new API is registered with xfrm_state module, not with xfrm_user as
the former needs translator for user_policy set by setsockopt() and
xfrm_user already uses functions from xfrm_state.

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Dmitry Safonov
2020-09-21 15:36:51 +01:00
committed by Steffen Klassert
parent 02a20d4fef
commit c9e7c76d70
5 changed files with 119 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/xfrm.h
View File

@@ -2000,6 +2000,25 @@ static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
return 0;
}
struct xfrm_translator {
struct module *owner;
};
#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
extern int xfrm_register_translator(struct xfrm_translator *xtr);
extern int xfrm_unregister_translator(struct xfrm_translator *xtr);
extern struct xfrm_translator *xfrm_get_translator(void);
extern void xfrm_put_translator(struct xfrm_translator *xtr);
#else
static inline struct xfrm_translator *xfrm_get_translator(void)
{
return NULL;
}
static inline void xfrm_put_translator(struct xfrm_translator *xtr)
{
}
#endif
#if IS_ENABLED(CONFIG_IPV6)
static inline bool xfrm6_local_dontfrag(const struct sock *sk)
{