[PATCH 2/8] backports: skbuff: add skb_list_walk_safe() and skb_mark_not_on_list()

From: Johannes Berg <[email protected]>

Signed-off-by: Johannes Berg <[email protected]>
[Do not add skb_mark_not_on_list() on kernel > 4.19.10]
Signed-off-by: Hauke Mehrtens <[email protected]>
---
 backport/backport-include/linux/skbuff.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/backport/backport-include/linux/skbuff.h b/backport/backport-include/linux/skbuff.h
index 42b048ad..3ed990d0 100644
--- a/backport/backport-include/linux/skbuff.h
+++ b/backport/backport-include/linux/skbuff.h
@@ -378,6 +378,13 @@ static inline struct sk_buff *__skb_peek(const struct sk_buff_head *list_)
 {
 	return list_->next;
 }
+
+#if !LINUX_VERSION_IN_RANGE(4,19,10, 4,20,0)
+static inline void skb_mark_not_on_list(struct sk_buff *skb)
+{
+	skb->next = NULL;
+}
+#endif /* 4.19.10 <= x < 4.20 */
 #endif
 
 #if LINUX_VERSION_IS_LESS(4,11,0)
@@ -406,4 +413,10 @@ static inline void nf_reset_ct(struct sk_buff *skb)
 }
 #endif
 
+#ifndef skb_list_walk_safe
+#define skb_list_walk_safe(first, skb, next_skb)				\
+	for ((skb) = (first), (next_skb) = (skb) ? (skb)->next : NULL; (skb); 	\
+	     (skb) = (next_skb), (next_skb) = (skb) ? (skb)->next : NULL)
+#endif
+
 #endif /* __BACKPORT_SKBUFF_H */
-- 
2.20.1

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