diff options
| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2008-05-27 17:37:49 +0900 |
|---|---|---|
| committer | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2008-06-05 04:02:34 +0900 |
| commit | 4bed72e4f5502ea3322f0a00794815fa58951abe (patch) | |
| tree | fd652d01822746a84d5812bbe2ee0661fbd3b86f /include | |
| parent | baa2bfb8aef24bb7fe1875b256918724b3884662 (diff) | |
| download | linux-4bed72e4f5502ea3322f0a00794815fa58951abe.tar.bz2 | |
[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')
| -rw-r--r-- | include/net/addrconf.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h index 0a2f0372df31..bbd3d583c6e6 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) */ |