netdev - [PATCH 02/12] flow_dissector: Parse ETH_P

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Message-Id: <20240731172332.683815-3-tom@herbertland.com>
Date: Wed, 31 Jul 2024 10:23:22 -0700
From: Tom Herbert <tom@...bertland.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	edumazet@...gle.com,
	netdev@...r.kernel.org,
	felipe@...anda.io
Cc: Tom Herbert <tom@...bertland.com>
Subject: [PATCH 02/12] flow_dissector: Parse ETH_P_TEB

ETH_P_TEB (Trans Ether Bridging) is the EtherType to carry
a plain Etherent frame. Add case in skb_flow_dissect to parse
packets of this type

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 net/core/flow_dissector.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index e034e502ab49..d9abb4ae021b 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -1284,6 +1284,27 @@ bool __skb_flow_dissect(struct net *net,
 
 		break;
 	}
+	case htons(ETH_P_TEB): {
+		const struct ethhdr *eth;
+		struct ethhdr _eth;
+
+		eth = __skb_header_pointer(skb, nhoff, sizeof(_eth),
+					   data, hlen, &_eth);
+		if (!eth)
+			goto out_bad;
+
+		proto = eth->h_proto;
+		nhoff += sizeof(*eth);
+
+		/* Cap headers that we access via pointers at the
+		 * end of the Ethernet header as our maximum alignment
+		 * at that point is only 2 bytes.
+		 */
+		if (NET_IP_ALIGN)
+			hlen = nhoff;
+
+		goto proto_again;
+	}
 	case htons(ETH_P_8021AD):
 	case htons(ETH_P_8021Q): {
 		const struct vlan_hdr *vlan = NULL;
-- 
2.34.1