linux-kernel - [PATCH 5.10 073/141] net: let flow have same hash in two directions

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Date:   Mon, 26 Sep 2022 12:11:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, zhang kai <zhangkaiheb@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 073/141] net: let flow have same hash in two directions

From: zhang kai <zhangkaiheb@....com>

[ Upstream commit 1e60cebf82948cfdc9497ea4553bab125587593c ]

using same source and destination ip/port for flow hash calculation
within the two directions.

Signed-off-by: zhang kai <zhangkaiheb@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Stable-dep-of: 64ae13ed4784 ("net: core: fix flow symmetric hash")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/flow_dissector.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index f9baa9b1c77f..aad311c73810 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1485,7 +1485,7 @@ __be32 flow_get_u32_dst(const struct flow_keys *flow)
 }
 EXPORT_SYMBOL(flow_get_u32_dst);
 
-/* Sort the source and destination IP (and the ports if the IP are the same),
+/* Sort the source and destination IP and the ports,
  * to have consistent hash within the two directions
  */
 static inline void __flow_hash_consistentify(struct flow_keys *keys)
@@ -1496,11 +1496,11 @@ static inline void __flow_hash_consistentify(struct flow_keys *keys)
 	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
 		addr_diff = (__force u32)keys->addrs.v4addrs.dst -
 			    (__force u32)keys->addrs.v4addrs.src;
-		if ((addr_diff < 0) ||
-		    (addr_diff == 0 &&
-		     ((__force u16)keys->ports.dst <
-		      (__force u16)keys->ports.src))) {
+		if (addr_diff < 0)
 			swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst);
+
+		if ((__force u16)keys->ports.dst <
+		    (__force u16)keys->ports.src) {
 			swap(keys->ports.src, keys->ports.dst);
 		}
 		break;
@@ -1508,13 +1508,13 @@ static inline void __flow_hash_consistentify(struct flow_keys *keys)
 		addr_diff = memcmp(&keys->addrs.v6addrs.dst,
 				   &keys->addrs.v6addrs.src,
 				   sizeof(keys->addrs.v6addrs.dst));
-		if ((addr_diff < 0) ||
-		    (addr_diff == 0 &&
-		     ((__force u16)keys->ports.dst <
-		      (__force u16)keys->ports.src))) {
+		if (addr_diff < 0) {
 			for (i = 0; i < 4; i++)
 				swap(keys->addrs.v6addrs.src.s6_addr32[i],
 				     keys->addrs.v6addrs.dst.s6_addr32[i]);
+		}
+		if ((__force u16)keys->ports.dst <
+		    (__force u16)keys->ports.src) {
 			swap(keys->ports.src, keys->ports.dst);
 		}
 		break;
-- 
2.35.1