net: Add skb_dstref_steal and skb_dstref_restore

Going forward skb_dst_set will assert that skb dst_entry
is empty during skb_dst_set to prevent potential leaks. There
are few places that still manually manage dst_entry not using
the helpers. Convert them to the following new helpers:
- skb_dstref_steal that resets dst_entry and returns previous dst_entry
  value
- skb_dstref_restore that restores dst_entry previously reset via
  skb_dstref_steal

Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250818154032.3173645-2-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 14b923ddb6df..7538ca507ee9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1160,6 +1160,38 @@ static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
 }
 
 /**
+ * skb_dstref_steal() - return current dst_entry value and clear it
+ * @skb: buffer
+ *
+ * Resets skb dst_entry without adjusting its reference count. Useful in
+ * cases where dst_entry needs to be temporarily reset and restored.
+ * Note that the returned value cannot be used directly because it
+ * might contain SKB_DST_NOREF bit.
+ *
+ * When in doubt, prefer skb_dst_drop() over skb_dstref_steal() to correctly
+ * handle dst_entry reference counting.
+ *
+ * Returns: original skb dst_entry.
+ */
+static inline unsigned long skb_dstref_steal(struct sk_buff *skb)
+{
+	unsigned long refdst = skb->_skb_refdst;
+
+	skb->_skb_refdst = 0;
+	return refdst;
+}
+
+/**
+ * skb_dstref_restore() - restore skb dst_entry removed via skb_dstref_steal()
+ * @skb: buffer
+ * @refdst: dst entry from a call to skb_dstref_steal()
+ */
+static inline void skb_dstref_restore(struct sk_buff *skb, unsigned long refdst)
+{
+	skb->_skb_refdst = refdst;
+}
+
+/**
  * skb_dst_set - sets skb dst
  * @skb: buffer
  * @dst: dst entry