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| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2005-12-19 23:02:45 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-12-19 23:02:45 +0100 |
| commit | 3dd4bc68fac5df16b6d3ed6ed3c29cf05f29a47e (patch) | |
| tree | 854f73bd7862354eac94b624d436b59fdd5ffecb /net/ipv6/addrconf.c | |
| parent | [BRIDGE-NF]: Fix bridge-nf ipv6 length check (diff) | |
| download | linux-3dd4bc68fac5df16b6d3ed6ed3c29cf05f29a47e.tar.xz linux-3dd4bc68fac5df16b6d3ed6ed3c29cf05f29a47e.zip | |
[IPV6]: Fix route lifetime.
The route expiration time is stored in rt6i_expires in jiffies.
The argument of rt6_route_add() for adding a route is not the
expiration time in jiffies nor in clock_t, but the lifetime
(or time left before expiration) in clock_t.
Because of the confusion, we sometimes saw several strange errors
(FAILs) in TAHI IPv6 Ready Logo Phase-2 Self Test.
The symptoms were analyzed by Mitsuru Chinen <CHINEN@jp.ibm.com>.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 73a23b4130a5..4ea8cf7c0cc4 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1596,9 +1596,17 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) not good. */ if (valid_lft >= 0x7FFFFFFF/HZ) - rt_expires = 0; + rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); else - rt_expires = jiffies + valid_lft * HZ; + rt_expires = valid_lft * HZ; + + /* + * We convert this (in jiffies) to clock_t later. + * Avoid arithmetic overflow there as well. + * Overflow can happen only if HZ < USER_HZ. + */ + if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) + rt_expires = 0x7FFFFFFF / USER_HZ; if (pinfo->onlink) { struct rt6_info *rt; @@ -1610,12 +1618,12 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) ip6_del_rt(rt, NULL, NULL, NULL); rt = NULL; } else { - rt->rt6i_expires = rt_expires; + rt->rt6i_expires = jiffies + rt_expires; } } } else if (valid_lft) { addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, - dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); + dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); } if (rt) dst_release(&rt->u.dst); |