Patchwork [XFRM] Fix unexpected SA hard expiration after changing date

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Submitter Fan Du
Date July 31, 2012, 7:43 a.m.
Message ID <1343720634-1176-2-git-send-email-fdu@windriver.com>
Download mbox | patch
Permalink /patch/174171/
State Accepted
Delegated to: David Miller
Headers show

Comments

Fan Du - July 31, 2012, 7:43 a.m.
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>
---
 include/net/xfrm.h    |    4 ++++
 net/xfrm/xfrm_state.c |   22 ++++++++++++++++++----
 2 files changed, 22 insertions(+), 4 deletions(-)
David Miller - Aug. 2, 2012, 7:21 a.m.
From: Fan Du <fdu@windriver.com>
Date: Tue, 31 Jul 2012 15:43:54 +0800

> 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>

Applied.
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David Miller - Aug. 2, 2012, 7:23 a.m.
You know what Fan Du, I'm extremely irritated about your email
situation.

Every time you post a patch, I reply, and I get this crap:

Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.2.1 <fdu@windriver.com>... Mailbox disabled for this recipient' (delivery attempts: 0)

I've seen this at least 7 times, and this absolutely has to stop.

Otherwise I'm ignoring every patch you submit, it's as simple as
that.
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David Miller - Aug. 2, 2012, 7:23 a.m.
From: David Miller <davem@davemloft.net>
Date: Thu, 02 Aug 2012 00:23:08 -0700 (PDT)

> 
> You know what Fan Du, I'm extremely irritated about your email
> situation.
> 
> Every time you post a patch, I reply, and I get this crap:

And this email triggered it too, what gives?
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fan.du - Aug. 2, 2012, 8:58 a.m.
Hi, all

*Apologize* for all the trouble I brought to everyone, who gave me
advices/suggestions using fdu@windriver.com.
I'm truly sorry that all the inconvenience caused by my mistake.

fdu@windriver.com is obsolete!!!
I will use fan.du@windriver.com from now on.

Thanks


On 2012年08月02日 15:23, David Miller wrote:
>
> You know what Fan Du, I'm extremely irritated about your email
> situation.
>
> Every time you post a patch, I reply, and I get this crap:
>
> Diagnostic-Code: smtp; 5.1.0 - Unknown address error 550-'5.2.1<fdu@windriver.com>... Mailbox disabled for this recipient' (delivery attempts: 0)
>
> I've seen this at least 7 times, and this absolutely has to stop.
>
> Otherwise I'm ignoring every patch you submit, it's as simple as
> that.
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Patch

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index d9509eb..62b619e 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -213,6 +213,9 @@  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;
 
@@ -238,6 +241,7 @@  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,
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 5b228f9..fb64dc6 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -415,8 +415,17 @@  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;
 	}
@@ -433,10 +443,14 @@  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 +