From e3c0d04750751389d5116267f8cf4687444d9a50 Mon Sep 17 00:00:00 2001 From: Fan Du Date: Mon, 30 Jul 2012 21:43:54 +0000 Subject: [PATCH] Fix unexpected SA hard expiration after changing date 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 Signed-off-by: David S. Miller --- include/net/xfrm.h | 4 ++++ net/xfrm/xfrm_state.c | 21 +++++++++++++++++---- 2 files changed, 21 insertions(+), 4 deletions(-) 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..87cd0e4 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 +442,14 @@ 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 + -- 2.7.4