1 files changed, 98 insertions, 10 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c656cbaf35e8..a8e14dc1b04e 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -20,6 +20,15 @@
 #include <linux/module.h>
 #include <asm/uaccess.h>
 
+struct sock *xfrm_nl;
+EXPORT_SYMBOL(xfrm_nl);
+
+u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
+EXPORT_SYMBOL(sysctl_xfrm_aevent_etime);
+
+u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
+EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);
+
 /* Each xfrm_state may be linked to two tables:
 
    1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
@@ -50,18 +59,20 @@ static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 
 static int xfrm_state_gc_flush_bundles;
 
-static int __xfrm_state_delete(struct xfrm_state *x);
+int __xfrm_state_delete(struct xfrm_state *x);
 
 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
 
-static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
-static void km_state_expired(struct xfrm_state *x, int hard);
+int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
+void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
 
 static void xfrm_state_gc_destroy(struct xfrm_state *x)
 {
         if (del_timer(&x->timer))
                 BUG();
+        if (del_timer(&x->rtimer))
+                BUG();
         kfree(x->aalg);
         kfree(x->ealg);
         kfree(x->calg);
@@ -153,7 +164,7 @@ static void xfrm_timer_handler(unsigned long data)
 
         x->km.dying = warn;
         if (warn)
-                km_state_expired(x, 0);
+                km_state_expired(x, 0, 0);
 resched:
         if (next != LONG_MAX &&
             !mod_timer(&x->timer, jiffies + make_jiffies(next)))
@@ -168,13 +179,15 @@ expired:
                 goto resched;
         }
         if (!__xfrm_state_delete(x) && x->id.spi)
-                km_state_expired(x, 1);
+                km_state_expired(x, 1, 0);
 
 out:
         spin_unlock(&x->lock);
         xfrm_state_put(x);
 }
 
+static void xfrm_replay_timer_handler(unsigned long data);
+
 struct xfrm_state *xfrm_state_alloc(void)
 {
         struct xfrm_state *x;
@@ -190,11 +203,16 @@ struct xfrm_state *xfrm_state_alloc(void)
                 init_timer(&x->timer);
                 x->timer.function = xfrm_timer_handler;
                 x->timer.data     = (unsigned long)x;
+                init_timer(&x->rtimer);
+                x->rtimer.function = xfrm_replay_timer_handler;
+                x->rtimer.data     = (unsigned long)x;
                 x->curlft.add_time = (unsigned long)xtime.tv_sec;
                 x->lft.soft_byte_limit = XFRM_INF;
                 x->lft.soft_packet_limit = XFRM_INF;
                 x->lft.hard_byte_limit = XFRM_INF;
                 x->lft.hard_packet_limit = XFRM_INF;
+                x->replay_maxage = 0;
+                x->replay_maxdiff = 0;
                 spin_lock_init(&x->lock);
         }
         return x;
@@ -212,7 +230,7 @@ void __xfrm_state_destroy(struct xfrm_state *x)
 }
 EXPORT_SYMBOL(__xfrm_state_destroy);
 
-static int __xfrm_state_delete(struct xfrm_state *x)
+int __xfrm_state_delete(struct xfrm_state *x)
 {
         int err = -ESRCH;
 
@@ -228,6 +246,8 @@ static int __xfrm_state_delete(struct xfrm_state *x)
                 spin_unlock(&xfrm_state_lock);
                 if (del_timer(&x->timer))
                         __xfrm_state_put(x);
+                if (del_timer(&x->rtimer))
+                        __xfrm_state_put(x);
 
                 /* The number two in this test is the reference
                  * mentioned in the comment below plus the reference
@@ -249,6 +269,7 @@ static int __xfrm_state_delete(struct xfrm_state *x)
 
         return err;
 }
+EXPORT_SYMBOL(__xfrm_state_delete);
 
 int xfrm_state_delete(struct xfrm_state *x)
 {
@@ -426,6 +447,10 @@ static void __xfrm_state_insert(struct xfrm_state *x)
         if (!mod_timer(&x->timer, jiffies + HZ))
                 xfrm_state_hold(x);
 
+        if (x->replay_maxage &&
+            !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
+                xfrm_state_hold(x);
+
         wake_up(&km_waitq);
 }
 
@@ -580,7 +605,7 @@ int xfrm_state_check_expire(struct xfrm_state *x)
             (x->curlft.bytes >= x->lft.soft_byte_limit ||
              x->curlft.packets >= x->lft.soft_packet_limit)) {
                 x->km.dying = 1;
-                km_state_expired(x, 0);
+                km_state_expired(x, 0, 0);
         }
         return 0;
 }
@@ -762,6 +787,61 @@ out:
 }
 EXPORT_SYMBOL(xfrm_state_walk);
 
+
+void xfrm_replay_notify(struct xfrm_state *x, int event)
+{
+        struct km_event c;
+        /* we send notify messages in case
+         *  1. we updated on of the sequence numbers, and the seqno difference
+         *     is at least x->replay_maxdiff, in this case we also update the
+         *     timeout of our timer function
+         *  2. if x->replay_maxage has elapsed since last update,
+         *     and there were changes
+         *
+         *  The state structure must be locked!
+         */
+
+        switch (event) {
+        case XFRM_REPLAY_UPDATE:
+                if (x->replay_maxdiff &&
+                    (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
+                    (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))
+                        return;
+
+                break;
+
+        case XFRM_REPLAY_TIMEOUT:
+                if ((x->replay.seq == x->preplay.seq) &&
+                    (x->replay.bitmap == x->preplay.bitmap) &&
+                    (x->replay.oseq == x->preplay.oseq))
+                        return;
+
+                break;
+        }
+
+        memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
+        c.event = XFRM_MSG_NEWAE;
+        c.data.aevent = event;
+        km_state_notify(x, &c);
+
+        if (x->replay_maxage &&
+            !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
+                xfrm_state_hold(x);
+}
+EXPORT_SYMBOL(xfrm_replay_notify);
+
+static void xfrm_replay_timer_handler(unsigned long data)
+{
+        struct xfrm_state *x = (struct xfrm_state*)data;
+
+        spin_lock(&x->lock);
+
+        if (xfrm_aevent_is_on() && x->km.state == XFRM_STATE_VALID)
+                xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
+
+        spin_unlock(&x->lock);
+}
+
 int xfrm_replay_check(struct xfrm_state *x, u32 seq)
 {
         u32 diff;
@@ -805,6 +885,9 @@ void xfrm_replay_advance(struct xfrm_state *x, u32 seq)
                 diff = x->replay.seq - seq;
                 x->replay.bitmap |= (1U << diff);
         }
+
+        if (xfrm_aevent_is_on())
+                xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
 }
 EXPORT_SYMBOL(xfrm_replay_advance);
 
@@ -835,11 +918,12 @@ void km_state_notify(struct xfrm_state *x, struct km_event *c)
 EXPORT_SYMBOL(km_policy_notify);
 EXPORT_SYMBOL(km_state_notify);
 
-static void km_state_expired(struct xfrm_state *x, int hard)
+void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
 {
         struct km_event c;
 
         c.data.hard = hard;
+        c.pid = pid;
         c.event = XFRM_MSG_EXPIRE;
         km_state_notify(x, &c);
 
@@ -847,11 +931,12 @@ static void km_state_expired(struct xfrm_state *x, int hard)
                 wake_up(&km_waitq);
 }
 
+EXPORT_SYMBOL(km_state_expired);
 /*
  * We send to all registered managers regardless of failure
  * We are happy with one success
 */
-static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
+int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
 {
         int err = -EINVAL, acqret;
         struct xfrm_mgr *km;
@@ -865,6 +950,7 @@ static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_polic
         read_unlock(&xfrm_km_lock);
         return err;
 }
+EXPORT_SYMBOL(km_query);
 
 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
 {
@@ -883,17 +969,19 @@ int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
 }
 EXPORT_SYMBOL(km_new_mapping);
 
-void km_policy_expired(struct xfrm_policy *pol, int dir, int hard)
+void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
 {
         struct km_event c;
 
         c.data.hard = hard;
+        c.pid = pid;
         c.event = XFRM_MSG_POLEXPIRE;
         km_policy_notify(pol, dir, &c);
 
         if (hard)
                 wake_up(&km_waitq);
 }
+EXPORT_SYMBOL(km_policy_expired);
 
 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
 {