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Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 7af7ec635d90..9d7be61e5e6b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3023,6 +3023,24 @@ int skb_append_pagefrags(struct sk_buff *skb, struct page *page,
EXPORT_SYMBOL_GPL(skb_append_pagefrags);
/**
+ * skb_push_rcsum - push skb and update receive checksum
+ * @skb: buffer to update
+ * @len: length of data pulled
+ *
+ * This function performs an skb_push on the packet and updates
+ * the CHECKSUM_COMPLETE checksum. It should be used on
+ * receive path processing instead of skb_push unless you know
+ * that the checksum difference is zero (e.g., a valid IP header)
+ * or you are setting ip_summed to CHECKSUM_NONE.
+ */
+static unsigned char *skb_push_rcsum(struct sk_buff *skb, unsigned len)
+{
+ skb_push(skb, len);
+ skb_postpush_rcsum(skb, skb->data, len);
+ return skb->data;
+}
+
+/**
* skb_pull_rcsum - pull skb and update receive checksum
* @skb: buffer to update
* @len: length of data pulled
@@ -4167,9 +4185,9 @@ struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb,
if (!pskb_may_pull(skb_chk, offset))
goto err;
- __skb_pull(skb_chk, offset);
+ skb_pull_rcsum(skb_chk, offset);
ret = skb_chkf(skb_chk);
- __skb_push(skb_chk, offset);
+ skb_push_rcsum(skb_chk, offset);
if (ret)
goto err;