netdev - [Patch net-next 1/2] net: introduce skb_network_header_was

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Date:   Tue, 20 Nov 2018 18:13:08 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>
Subject: [Patch net-next 1/2] net: introduce skb_network_header_was_set()

Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 include/linux/skbuff.h | 5 +++++
 net/core/skbuff.c      | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a2e8297a5b00..afddb5c17ce5 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2444,6 +2444,11 @@ static inline u32 skb_network_header_len(const struct sk_buff *skb)
 	return skb->transport_header - skb->network_header;
 }
 
+static inline int skb_network_header_was_set(const struct sk_buff *skb)
+{
+	return skb->network_header != (typeof(skb->network_header))~0U;
+}
+
 static inline u32 skb_inner_network_header_len(const struct sk_buff *skb)
 {
 	return skb->inner_transport_header - skb->inner_network_header;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9a8a72cefe9b..b6ba923e7dc7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -227,6 +227,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
 	skb_reset_tail_pointer(skb);
 	skb->end = skb->tail + size;
 	skb->mac_header = (typeof(skb->mac_header))~0U;
+	skb->network_header = (typeof(skb->network_header))~0U;
 	skb->transport_header = (typeof(skb->transport_header))~0U;
 
 	/* make sure we initialize shinfo sequentially */
@@ -292,6 +293,7 @@ struct sk_buff *__build_skb(void *data, unsigned int frag_size)
 	skb_reset_tail_pointer(skb);
 	skb->end = skb->tail + size;
 	skb->mac_header = (typeof(skb->mac_header))~0U;
+	skb->network_header = (typeof(skb->network_header))~0U;
 	skb->transport_header = (typeof(skb->transport_header))~0U;
 
 	/* make sure we initialize shinfo sequentially */
-- 
2.19.1