netdev - [PATCH net 2/2] net_sched: fix TCF_LAYER_LINK case in tcf_get_base

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Message-Id: <20180118103236.32494-4-w.bumiller@proxmox.com>
Date:   Thu, 18 Jan 2018 11:32:36 +0100
From:   Wolfgang Bumiller <w.bumiller@...xmox.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH net 2/2] net_sched: fix TCF_LAYER_LINK case in tcf_get_base_ptr

TCF_LAYER_LINK and TCF_LAYER_NETWORK returned the same pointer as
skb->data points to the network header.
Use skb_mac_header instead.

Signed-off-by: Wolfgang Bumiller <w.bumiller@...xmox.com>
---
Alternatively this could return skb->head directly, but
'sk_buff->mac_header' is documented as 'Link layer header' and this
seemed more clear. Since on the first read I thought "it looks fine"
while in fact skb->head comes before skb->data, so this seems less
confusing.

 include/net/pkt_cls.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 8e08b6da72f3..753ac9361154 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -522,7 +522,7 @@ static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
 {
 	switch (layer) {
 		case TCF_LAYER_LINK:
-			return skb->data;
+			return skb_mac_header(skb);
 		case TCF_LAYER_NETWORK:
 			return skb_network_header(skb);
 		case TCF_LAYER_TRANSPORT:
-- 
2.11.0