netdev - [PATCH net 1/3] netfilter: flowtable: really fix NAT IPv6 offload

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Message-Id: <20221213140923.154594-2-pablo@netfilter.org>
Date:   Tue, 13 Dec 2022 15:09:21 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com
Subject: [PATCH net 1/3] netfilter: flowtable: really fix NAT IPv6 offload

From: Qingfang DENG <dqfext@...il.com>

The for-loop was broken from the start. It translates to:

	for (i = 0; i < 4; i += 4)

which means the loop statement is run only once, so only the highest
32-bit of the IPv6 address gets mangled.

Fix the loop increment.

Fixes: 0e07e25b481a ("netfilter: flowtable: fix NAT IPv6 offload mangling")
Fixes: 5c27d8d76ce8 ("netfilter: nf_flow_table_offload: add IPv6 support")
Signed-off-by: Qingfang DENG <dqfext@...il.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_flow_table_offload.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 0fdcdb2c9ae4..4d9b99abe37d 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -383,12 +383,12 @@ static void flow_offload_ipv6_mangle(struct nf_flow_rule *flow_rule,
 				     const __be32 *addr, const __be32 *mask)
 {
 	struct flow_action_entry *entry;
-	int i, j;
+	int i;
 
-	for (i = 0, j = 0; i < sizeof(struct in6_addr) / sizeof(u32); i += sizeof(u32), j++) {
+	for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++) {
 		entry = flow_action_entry_next(flow_rule);
 		flow_offload_mangle(entry, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
-				    offset + i, &addr[j], mask);
+				    offset + i * sizeof(u32), &addr[i], mask);
 	}
 }
 
-- 
2.30.2