netdev - [RFC PATCH 13/16] gtp: set skb protocol after pulling headers

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Date:   Sat, 23 Jan 2021 20:59:13 +0100
From:   Jonas Bonn <jonas@...rbonn.se>
To:     laforge@...monks.org, netdev@...r.kernel.org, pbshelar@...com,
        kuba@...nel.org
Cc:     pablo@...filter.org, Jonas Bonn <jonas@...rbonn.se>
Subject: [RFC PATCH 13/16] gtp: set skb protocol after pulling headers

Based on work by Pravin Shelar.

Once the GTP headers have been the removed, the SKB protocol should be
set to that of the inner packet.

Signed-off-by: Jonas Bonn <jonas@...rbonn.se>
---
 drivers/net/gtp.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 7ab8540e46d2..8aab46ec8a94 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -197,6 +197,20 @@ static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
 	 * calculate the transport header.
 	 */
 	skb_reset_network_header(skb);
+	if (pskb_may_pull(skb, sizeof(struct iphdr))) {
+		struct iphdr *iph;
+
+		iph = ip_hdr(skb);
+		if (iph->version == 4) {
+			netdev_dbg(pctx->dev, "inner pkt: ipv4");
+			skb->protocol = htons(ETH_P_IP);
+		} else if (iph->version == 6) {
+			netdev_dbg(pctx->dev, "inner pkt: ipv6");
+			skb->protocol = htons(ETH_P_IPV6);
+		} else {
+			netdev_dbg(pctx->dev, "inner pkt error: Unknown type");
+		}
+	}
 
 	skb->dev = pctx->dev;
 
-- 
2.27.0