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ipvlan: fix bound dev checking for IPv6 l3s mode

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[ Upstream commit ce57adc222 ]

The commit 59a0b022aa ("ipvlan: Make skb->skb_iif track skb->dev for l3s
mode") fixed ipvlan bonded dev checking by updating skb skb_iif. This fix
works for IPv4, as in raw_v4_input() the dif is from inet_iif(skb), which
is skb->skb_iif when there is no route.

But for IPv6, the fix is not enough, because in ipv6_raw_deliver() ->
raw_v6_match(), the dif is inet6_iif(skb), which is returns IP6CB(skb)->iif
instead of skb->skb_iif if it's not a l3_slave. To fix the IPv6 part
issue. Let's set IP6CB(skb)->iif to correct ifindex.

BTW, ipvlan handles NS/NA specifically. Since it works fine, I will not
reset IP6CB(skb)->iif when addr->atype is IPVL_ICMPV6.

Fixes: c675e06a98 ("ipvlan: decouple l3s mode dependencies from other modes")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2196710
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hangbin Liu 2023-06-09 17:15:02 +08:00 committed by Greg Kroah-Hartman
parent 33bd6b76ac
commit 0b8ae7d6e4
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ipvlan/ipvlan_l3s.c
View file

@ -102,6 +102,10 @@ static unsigned int ipvlan_nf_input(void *priv, struct sk_buff *skb,
skb->dev = addr->master->dev;
skb->skb_iif = skb->dev->ifindex;
#if IS_ENABLED(CONFIG_IPV6)
if (addr->atype == IPVL_IPV6)
IP6CB(skb)->iif = skb->dev->ifindex;
#endif
len = skb->len + ETH_HLEN;
ipvlan_count_rx(addr->master, len, true, false);
out: