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Date: Thu, 25 Jun 2009 11:40:19 +0300 (EEST)
From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To: Jens Rosenboom <me@...r.de>
cc: Netdev <netdev@...r.kernel.org>
Subject: Re: PATCH: ipv6: avoid wraparound for expired lifetimes
On Thu, 25 Jun 2009, Jens Rosenboom wrote:
> If the valid or preferred lifetime for an address expires, the kernel
> shows huge values for these due to a counter wrap,
I suspect we have plenty of potentially counter-wrapped printouts all
around the kernel. So you're fixing just a tip of the iceberg.
> the following patch
> should fix this, at least it did in the test I ran.
You must be kidding...
> --- linux-2.6.30.orig/net/ipv6/addrconf.c 2009-06-10 05:05:27.000000000 +0200
> +++ linux-2.6.30/net/ipv6/addrconf.c 2009-06-25 09:33:38.000000000 +0200
> @@ -3361,9 +3361,17 @@
> valid = ifa->valid_lft;
> if (preferred != INFINITY_LIFE_TIME) {
> long tval = (jiffies - ifa->tstamp)/HZ;
> - preferred -= tval;
> - if (valid != INFINITY_LIFE_TIME)
> - valid -= tval;
> + if (preferred > tval) {
> + preferred -= tval;
> + } else {
> + preferred = 0;
> + }
> + if (valid != INFINITY_LIFE_TIME) {
> + if (valid > tval) {
> + valid -= tval;
> + } else {
> + valid = 0;
> + }
> }
...because of the brace that is missing here, I get:
ijjarvin@...nthope:~/linux/mainline$ make net/ipv6/addrconf.o
CHK include/linux/version.h
CHK include/linux/utsrelease.h
SYMLINK include/asm -> include/asm-x86
CALL scripts/checksyscalls.sh
CC net/ipv6/addrconf.o
net/ipv6/addrconf.c: In function inet6_fill_ifaddr:
net/ipv6/addrconf.c:3393: error: invalid storage class for function
inet6_fill_ifmcaddr
net/ipv6/addrconf.c:3391: warning: ISO C90 forbids mixed declarations and
code
net/ipv6/addrconf.c:3418: error: invalid storage class for function
inet6_fill_ifacaddr
net/ipv6/addrconf.c:3450: error: invalid storage class for function
inet6_dump_addr
net/ipv6/addrconf.c:3531: error: invalid storage class for function
inet6_dump_ifaddr
net/ipv6/addrconf.c:3538: error: invalid storage class for function
inet6_dump_ifmcaddr
net/ipv6/addrconf.c:3546: error: invalid storage class for function
inet6_dump_ifacaddr
net/ipv6/addrconf.c:3554: error: invalid storage class for function
inet6_rtm_getaddr
net/ipv6/addrconf.c:3604: error: invalid storage class for function
inet6_ifa_notify
net/ipv6/addrconf.c:3629: error: invalid storage class for function
ipv6_store_devconf
net/ipv6/addrconf.c:3674: error: invalid storage class for function
inet6_if_nlmsg_size
net/ipv6/addrconf.c:3691: error: invalid storage class for function
__snmp6_fill_stats
net/ipv6/addrconf.c:3706: error: invalid storage class for function
snmp6_fill_stats
net/ipv6/addrconf.c:3719: error: invalid storage class for function
inet6_fill_ifinfo
net/ipv6/addrconf.c:3787: error: invalid storage class for function
inet6_dump_ifinfo
net/ipv6/addrconf.c:3840: error: invalid storage class for function
inet6_prefix_nlmsg_size
net/ipv6/addrconf.c:3849: error: invalid storage class for function
inet6_fill_prefix
net/ipv6/addrconf.c:3887: error: invalid storage class for function
inet6_prefix_notify
net/ipv6/addrconf.c:3911: error: invalid storage class for function
__ipv6_ifa_notify
net/ipv6/addrconf.c:3939: error: invalid storage class for function
ipv6_ifa_notify
net/ipv6/addrconf.c:3951: error: invalid storage class for function
addrconf_sysctl_forward
net/ipv6/addrconf.c:3967: error: invalid storage class for function
addrconf_sysctl_forward_strategy
net/ipv6/addrconf.c:3999: error: invalid storage class for function
dev_disable_change
net/ipv6/addrconf.c:4010: error: invalid storage class for function
addrconf_disable_change
net/ipv6/addrconf.c:4030: error: invalid storage class for function
addrconf_disable_ipv6
net/ipv6/addrconf.c:4055: error: invalid storage class for function
addrconf_sysctl_disable
net/ipv6/addrconf.c:4081: error: initializer element is not constant
net/ipv6/addrconf.c:4081: error: (near initialization for
addrconf_sysctl.addrconf_vars[0].proc_handler)
net/ipv6/addrconf.c:4082: error: initializer element is not constant
net/ipv6/addrconf.c:4082: error: (near initialization for
addrconf_sysctl.addrconf_vars[0].strategy)
net/ipv6/addrconf.c:4304: error: initializer element is not constant
net/ipv6/addrconf.c:4304: error: (near initialization for
addrconf_sysctl.addrconf_vars[26].proc_handler)
net/ipv6/addrconf.c:4323: error: invalid storage class for function
__addrconf_sysctl_register
net/ipv6/addrconf.c:4377: error: invalid storage class for function
__addrconf_sysctl_unregister
net/ipv6/addrconf.c:4391: error: invalid storage class for function
addrconf_sysctl_register
net/ipv6/addrconf.c:4401: error: invalid storage class for function
addrconf_sysctl_unregister
net/ipv6/addrconf.c:4410: error: invalid storage class for function
addrconf_init_net
net/ipv6/addrconf.c:4461: error: invalid storage class for function
addrconf_exit_net
net/ipv6/addrconf.c:4473: error: initializer element is not constant
net/ipv6/addrconf.c:4473: error: (near initialization for
addrconf_ops.init)
net/ipv6/addrconf.c:4474: error: initializer element is not constant
net/ipv6/addrconf.c:4474: error: (near initialization for
addrconf_ops.exit)
net/ipv6/addrconf.c:4486: error: non-static declaration of
register_inet6addr_notifier follows static declaration
net/ipv6/addrconf.c:4482: error: previous definition of
register_inet6addr_notifier was here
net/ipv6/addrconf.c:4493: error: non-static declaration of
unregister_inet6addr_notifier follows static declaration
net/ipv6/addrconf.c:4489: error: previous definition of
unregister_inet6addr_notifier was here
net/ipv6/addrconf.c:4601: error: expected declaration or statement at end
of input
make[1]: *** [net/ipv6/addrconf.o] Error 1
make: *** [net/ipv6/addrconf.o] Error 2
ijjarvin@...nthope:~/linux/mainline$
--
i.
--
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