[IPV6] ADDRCONF: Allow longer lifetime on 64bit archs.

[pandora-kernel.git] / include / net / addrconf.h

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 0a2f037..bbd3d58 100644 (file)
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -94,6 +94,28 @@ extern void                  addrconf_join_solict(struct net_device *dev,
 extern void                    addrconf_leave_solict(struct inet6_dev *idev,
                                        struct in6_addr *addr);
 
+static inline unsigned long addrconf_timeout_fixup(u32 timeout,
+                                                   unsigned unit)
+{
+       if (timeout == 0xffffffff)
+               return ~0UL;
+
+       /*
+        * Avoid arithmetic overflow.
+        * Assuming unit is constant and non-zero, this "if" statement
+        * will go away on 64bit archs.
+        */
+       if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
+               return LONG_MAX / unit;
+
+       return timeout;
+}
+
+static inline int addrconf_finite_timeout(unsigned long timeout)
+{
+       return ~timeout;
+}
+
 /*
  *     IPv6 Address Label subsystem (addrlabel.c)
  */