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ipv6: fix prefix route expiry in modify_prefix_route()

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modify_prefix_route() is given the lifetime in clock_t relative to now,
but fib6_set_expires() wants an absolute jiffies value. So when a
permanent address is changed to a finite valid_lft, the prefix route
ends up already expired and GC removes it.

Steps to reproduce:

  ip link add dummy9 type dummy
  ip link set dummy9 up
  ip -6 addr add 2001:db8:9::1/64 dev dummy9
  ip -6 addr change 2001:db8:9::1/64 dev dummy9 valid_lft 3600 preferred_lft 3600
  ip -6 route show dev dummy9    # expires is negative

Fixes: 8308f3ff17 ("net/ipv6: Add support for specifying metric of connected routes")
Signed-off-by: Qishuai Liu <lqs@lqs.me>
Reviewed-by: Hangbin Liu <liuhangbin@kylinos.cn>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260923132048.3272878-1-lqs@lqs.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Qishuai Liu 2026-09-23 13:20:48 +00:00 committed by Jakub Kicinski
parent 0e7fe2b0ca
commit a7bfaba482
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/addrconf.c
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@ -4874,7 +4874,7 @@ static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp,
fib6_clean_expires(f6i);
fib6_may_remove_gc_list(net, f6i);
} else {
fib6_set_expires(f6i, expires);
fib6_set_expires(f6i, jiffies + clock_t_to_jiffies(expires));
fib6_add_gc_list(f6i);
}