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[XFRM]: Export SAD info.

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On a system with a lot of SAs, counting SAD entries chews useful
CPU time since you need to dump the whole SAD to user space;
i.e something like ip xfrm state ls | grep -i src | wc -l
I have seen taking literally minutes on a 40K SAs when the system
is swapping.
With this patch, some of the SAD info (that was already being tracked)
is exposed to user space. i.e you do:
ip xfrm state count
And you get the count; you can also pass -s to the command line and
get the hash info.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2007-04-26 00:10:29 -07:00 • committed by David S. Miller
commit 28d8909bc7
4 changed files with 99 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

25
include/linux/xfrm.h
View file

@ -181,6 +181,10 @@ enum {
XFRM_MSG_MIGRATE,
#define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE
XFRM_MSG_NEWSADINFO,
#define XFRM_MSG_NEWSADINFO XFRM_MSG_NEWSADINFO
XFRM_MSG_GETSADINFO,
#define XFRM_MSG_GETSADINFO XFRM_MSG_GETSADINFO
__XFRM_MSG_MAX
};
#define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@ -234,6 +238,17 @@ enum xfrm_ae_ftype_t {
#define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
};
/* SAD Table filter flags */
enum xfrm_sad_ftype_t {
XFRM_SAD_UNSPEC,
XFRM_SAD_HMASK=1,
XFRM_SAD_HMAX=2,
XFRM_SAD_CNT=4,
__XFRM_SAD_MAX
#define XFRM_SAD_MAX (__XFRM_SAD_MAX - 1)
};
struct xfrm_userpolicy_type {
__u8 type;
__u16 reserved1;
@ -265,6 +280,16 @@ enum xfrm_attr_type_t {
#define XFRMA_MAX (__XFRMA_MAX - 1)
};
enum xfrm_sadattr_type_t {
XFRMA_SAD_UNSPEC,
XFRMA_SADHMASK,
XFRMA_SADHMAX,
XFRMA_SADCNT,
__XFRMA_SAD_MAX
#define XFRMA_SAD_MAX (__XFRMA_SAD_MAX - 1)
};
struct xfrm_usersa_info {
struct xfrm_selector sel;
struct xfrm_id id;

8
include/net/xfrm.h
View file

@ -416,6 +416,13 @@ struct xfrm_audit
u32 secid;
};
/* SAD metadata, add more later */
struct xfrm_sadinfo
{
u32 sadhcnt; /* current hash bkts */
u32 sadhmcnt; /* max allowed hash bkts */
u32 sadcnt; /* current running count */
};
#ifdef CONFIG_AUDITSYSCALL
extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
struct xfrm_policy *xp, struct xfrm_state *x);
@ -938,6 +945,7 @@ static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **s
extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
extern int xfrm_state_delete(struct xfrm_state *x);
extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
extern void xfrm_sad_getinfo(struct xfrm_sadinfo *si);
extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_notify(struct xfrm_state *x, int event);