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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-05-27 17:37:49 +0900
committerYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-06-05 04:02:34 +0900
commit4bed72e4f5502ea3322f0a00794815fa58951abe (patch)
treefd652d01822746a84d5812bbe2ee0661fbd3b86f /include/net/addrconf.h
parentbaa2bfb8aef24bb7fe1875b256918724b3884662 (diff)
[IPV6] ADDRCONF: Allow longer lifetime on 64bit archs.
- Allow longer lifetimes (>= 0x7fffffff/HZ) on 64bit archs by using unsigned long. - Shadow this arithmetic overflow workaround by introducing helper functions: addrconf_timeout_fixup() and addrconf_finite_timeout(). Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat (limited to 'include/net/addrconf.h')
-rw-r--r--include/net/addrconf.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 0a2f0372df3..bbd3d583c6e 100644
--- 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)
*/