From 0492d857636e1c52cd71594a723c4b26a7b31978 Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 16 Mar 2022 11:19:43 +0100
Subject: netfilter: flowtable: Fix QinQ and pppoe support for inet table

nf_flow_offload_inet_hook() does not check for 802.1q and PPPoE.
Fetch inner ethertype from these encapsulation protocols.

Fixes: 72efd585f714 ("netfilter: flowtable: add pppoe support")
Fixes: 4cd91f7c290f ("netfilter: flowtable: add vlan support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/net/netfilter/nf_flow_table.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'include/net/netfilter')

diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index bd59e950f4d6..64daafd1fc41 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -10,6 +10,8 @@
 #include <linux/netfilter/nf_conntrack_tuple_common.h>
 #include <net/flow_offload.h>
 #include <net/dst.h>
+#include <linux/if_pppox.h>
+#include <linux/ppp_defs.h>
 
 struct nf_flowtable;
 struct nf_flow_rule;
@@ -317,4 +319,20 @@ int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
 int nf_flow_table_offload_init(void);
 void nf_flow_table_offload_exit(void);
 
+static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb)
+{
+	__be16 proto;
+
+	proto = *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
+			     sizeof(struct pppoe_hdr)));
+	switch (proto) {
+	case htons(PPP_IP):
+		return htons(ETH_P_IP);
+	case htons(PPP_IPV6):
+		return htons(ETH_P_IPV6);
+	}
+
+	return 0;
+}
+
 #endif /* _NF_FLOW_TABLE_H */
-- 
cgit v1.2.3