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[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>
This commit is contained in:
YOSHIFUJI Hideaki 2005-12-19 14:02:45 -08:00 committed by David S. Miller
parent b03664869a
commit 3dd4bc68fa
2 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
net/ipv6/addrconf.c
View File

@ -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);

2
net/ipv6/route.c
View File

@ -829,7 +829,7 @@ int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh,
}
rt->u.dst.obsolete = -1;
rt->rt6i_expires = clock_t_to_jiffies(rtmsg->rtmsg_info);
rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info);
if (nlh && (r = NLMSG_DATA(nlh))) {
rt->rt6i_protocol = r->rtm_protocol;
} else {