Thread (11 messages) read the whole thread 11 messages, 2 authors, 2020-01-08
STALE2396d

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[PATCH 3/9] netfilter: nf_flow_table_offload: fix incorrect ethernet dst address

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2020-01-08 23:17:27
Also in: netfilter-devel
Subsystem: netfilter, networking [general], the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds 

From: wenxu <redacted>

Ethernet destination for original traffic takes the source ethernet address
in the reply direction. For reply traffic, this takes the source
ethernet address of the original direction.

Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support")
Signed-off-by: wenxu <redacted>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_flow_table_offload.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 0d72e5ccb47b..ee9edbe50d4f 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -166,14 +166,16 @@ static int flow_offload_eth_dst(struct net *net,
 				enum flow_offload_tuple_dir dir,
 				struct nf_flow_rule *flow_rule)
 {
-	const struct flow_offload_tuple *tuple = &flow->tuplehash[dir].tuple;
 	struct flow_action_entry *entry0 = flow_action_entry_next(flow_rule);
 	struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
+	const void *daddr = &flow->tuplehash[!dir].tuple.src_v4;
+	const struct dst_entry *dst_cache;
 	struct neighbour *n;
 	u32 mask, val;
 	u16 val16;
 
-	n = dst_neigh_lookup(tuple->dst_cache, &tuple->dst_v4);
+	dst_cache = flow->tuplehash[dir].tuple.dst_cache;
+	n = dst_neigh_lookup(dst_cache, daddr);
 	if (!n)
 		return -ENOENT;
 
-- 
2.11.0
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