Merge branch 'linus'

1 files changed, 42 insertions, 0 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 2144952..c9f8784 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -356,6 +356,24 @@ void __kfree_skb(struct sk_buff *skb)
 }
 
 /**
+ *	kfree_skb - free an sk_buff
+ *	@skb: buffer to free
+ *
+ *	Drop a reference to the buffer and free it if the usage count has
+ *	hit zero.
+ */
+void kfree_skb(struct sk_buff *skb)
+{
+	if (unlikely(!skb))
+		return;
+	if (likely(atomic_read(&skb->users) == 1))
+		smp_rmb();
+	else if (likely(!atomic_dec_and_test(&skb->users)))
+		return;
+	__kfree_skb(skb);
+}
+
+/**
  *	skb_clone	-	duplicate an sk_buff
  *	@skb: buffer to clone
  *	@gfp_mask: allocation priority
@@ -1777,6 +1795,29 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
 	return 0;
 }
 
+/**
+ *	skb_pull_rcsum - pull skb and update receive checksum
+ *	@skb: buffer to update
+ *	@start: start of data before pull
+ *	@len: length of data pulled
+ *
+ *	This function performs an skb_pull on the packet and updates
+ *	update the CHECKSUM_HW checksum.  It should be used on receive
+ *	path processing instead of skb_pull unless you know that the
+ *	checksum difference is zero (e.g., a valid IP header) or you
+ *	are setting ip_summed to CHECKSUM_NONE.
+ */
+unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len)
+{
+	BUG_ON(len > skb->len);
+	skb->len -= len;
+	BUG_ON(skb->len < skb->data_len);
+	skb_postpull_rcsum(skb, skb->data, len);
+	return skb->data += len;
+}
+
+EXPORT_SYMBOL_GPL(skb_pull_rcsum);
+
 void __init skb_init(void)
 {
 	skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
@@ -1799,6 +1840,7 @@ void __init skb_init(void)
 
 EXPORT_SYMBOL(___pskb_trim);
 EXPORT_SYMBOL(__kfree_skb);
+EXPORT_SYMBOL(kfree_skb);
 EXPORT_SYMBOL(__pskb_pull_tail);
 EXPORT_SYMBOL(__alloc_skb);
 EXPORT_SYMBOL(pskb_copy);