From 9716178a3abd7e4eb00ac44d664cfb2311e88c3b Mon Sep 17 00:00:00 2001
From: Jonas Bonn <jonas@norrbonn.se>
Date: Wed, 3 Feb 2021 08:08:05 +0100
Subject: [PATCH] gtp: update rx_length_errors for abnormally short packets
Based on work by Pravin Shelar.
Update appropriate stats when packet transmission isn't possible.
Signed-off-by: Jonas Bonn <jonas@norrbonn.se>
Acked-by: Harald Welte <laforge@gnumonks.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/gtp.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index a1bb028189776..9a70f05baf6e4 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -189,8 +189,10 @@ static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
/* Get rid of the GTP + UDP headers. */
if (iptunnel_pull_header(skb, hdrlen, skb->protocol,
- !net_eq(sock_net(pctx->sk), dev_net(pctx->dev))))
- return -1;
+ !net_eq(sock_net(pctx->sk), dev_net(pctx->dev)))) {
+ pctx->dev->stats.rx_length_errors++;
+ goto err;
+ }
netdev_dbg(pctx->dev, "forwarding packet from GGSN to uplink\n");
@@ -206,6 +208,10 @@ static int gtp_rx(struct pdp_ctx *pctx, struct sk_buff *skb,
netif_rx(skb);
return 0;
+
+err:
+ pctx->dev->stats.rx_dropped++;
+ return -1;
}
/* 1 means pass up to the stack, -1 means drop and 0 means decapsulated. */
--
2.30.2