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Fix unexpected SA hard expiration after changing date

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After SA is setup, one timer is armed to detect soft/hard expiration,
however the timer handler uses xtime to do the math. This makes hard
expiration occurs first before soft expiration after setting new date
with big interval. As a result new child SA is deleted before rekeying
the new one.

Signed-off-by: Fan Du <fdu@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Change-Id: I44623eedcfb44088e86845b4726198a5cca02c80
This commit is contained in:
Fan Du 2012-07-30 21:43:54 +00:00 committed by surblazer
parent d91c40e298
commit adff1877a7
2 changed files with 21 additions and 4 deletions
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4
include/net/xfrm.h
View file

@ -214,6 +214,9 @@ struct xfrm_state {
struct xfrm_lifetime_cur curlft;
struct tasklet_hrtimer mtimer;
/* used to fix curlft->add_time when changing date */
long saved_tmo;
/* Last used time */
unsigned long lastused;
@ -239,6 +242,7 @@ static inline struct net *xs_net(struct xfrm_state *x)
/* xflags - make enum if more show up */
#define XFRM_TIME_DEFER 1
#define XFRM_SOFT_EXPIRE 2
enum {
XFRM_STATE_VOID,

21
net/xfrm/xfrm_state.c
View file

@ -407,8 +407,17 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
if (x->lft.hard_add_expires_seconds) {
long tmo = x->lft.hard_add_expires_seconds +
x->curlft.add_time - now;
if (tmo <= 0)
goto expired;
if (tmo <= 0) {
if (x->xflags & XFRM_SOFT_EXPIRE) {
/* enter hard expire without soft expire first?!
* setting a new date could trigger this.
* workarbound: fix x->curflt.add_time by below:
*/
x->curlft.add_time = now - x->saved_tmo - 1;
tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
} else
goto expired;
}
if (tmo < next)
next = tmo;
}
@ -425,10 +434,14 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
if (x->lft.soft_add_expires_seconds) {
long tmo = x->lft.soft_add_expires_seconds +
x->curlft.add_time - now;
if (tmo <= 0)
if (tmo <= 0) {
warn = 1;
else if (tmo < next)
x->xflags &= ~XFRM_SOFT_EXPIRE;
} else if (tmo < next) {
next = tmo;
x->xflags |= XFRM_SOFT_EXPIRE;
x->saved_tmo = tmo;
}
}
if (x->lft.soft_use_expires_seconds) {
long tmo = x->lft.soft_use_expires_seconds +