From c69f114d09891adfa3e301a35d9e872b8b7b5a50 Mon Sep 17 00:00:00 2001 From: Miao Wang Date: Tue, 22 Jun 2021 12:24:50 +0800 Subject: net/ipv4: swap flow ports when validating source 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: 5a847a6e1477 ("net/ipv4: Initialize proto and ports in flow struct") Signed-off-by: Miao Wang Reviewed-by: David Ahern Signed-off-by: David S. Miller --- net/ipv4/fib_frontend.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net') diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 84bb707bd88d..647bceab56c2 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -371,6 +371,8 @@ 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)) -- cgit v1.2.3