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Subject[PATCH 1/1] Address regression in inet6_validate_link_af
Date
Patch 7dc2bccab0ee37ac28096b8fcdc390a679a15841 introduces a regression
with systemd 241. In that revision, systemd-networkd fails to pass the
required flags early enough. This appears to be addressed in later
versions of systemd, but for users of version 241 where systemd-networkd
nonetheless worked with earlier kernels, the strict check introduced by
the patch causes a regression in behaviour.

This patch converts the failure to supply the required flags from an
error into a warning. With this, systemd-networkd version 241 once
again is able to bring up the link, albeit not quite as intended and
thereby with a warning in the kernel log.

CC: Maxim Mikityanskiy <maximmi@mellanox.com>
CC: David S. Miller <davem@davemloft.net>
CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Signed-off-by: Jonas Bonn <jonas@norrbonn.se>
---
net/ipv6/addrconf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 081bb517e40d..e2477bf92e12 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5696,7 +5696,8 @@ static int inet6_validate_link_af(const struct net_device *dev,
return err;

if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
- return -EINVAL;
+ net_warn_ratelimited(
+ "required link flag omitted: TOKEN/ADDR_GEN_MODE\n");

if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
--
2.20.1
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