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net/ipv4: swap flow ports when validating source 

[ Upstream commit c69f114d09891adfa3e301a35d9e872b8b7b5a50 ]

When doing source address validation, the flowi4 struct used for
fib_lookup should be in the reverse direction to the given skb.
fl4_dport and fl4_sport returned by fib4_rules_early_flow_dissect
should thus be swapped.

Fixes: 5a847a6e14 ("net/ipv4: Initialize proto and ports in flow struct")
Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miao Wang 2021-06-22 12:24:50 +08:00 committed by Greg Kroah-Hartman
parent 74e76cd632
commit 117e1495a6
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/fib_frontend.c
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@ -381,6 +381,8 @@ static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
fl4.flowi4_proto = 0;
fl4.fl4_sport = 0;
fl4.fl4_dport = 0;
} else {
swap(fl4.fl4_sport, fl4.fl4_dport);
}
if (fib_lookup(net, &fl4, &res, 0))