summaryrefslogtreecommitdiff
path: root/include/linux/skbuff.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h48
1 files changed, 27 insertions, 21 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index bec1cc7d5e3c..6f69b3f914fb 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1638,6 +1638,11 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
skb->mac_header += offset;
}
+static inline void skb_pop_mac_header(struct sk_buff *skb)
+{
+ skb->mac_header = skb->network_header;
+}
+
static inline void skb_probe_transport_header(struct sk_buff *skb,
const int offset_hint)
{
@@ -2263,6 +2268,24 @@ static inline void skb_postpull_rcsum(struct sk_buff *skb,
unsigned char *skb_pull_rcsum(struct sk_buff *skb, unsigned int len);
+/**
+ * pskb_trim_rcsum - trim received skb and update checksum
+ * @skb: buffer to trim
+ * @len: new length
+ *
+ * This is exactly the same as pskb_trim except that it ensures the
+ * checksum of received packets are still valid after the operation.
+ */
+
+static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
+{
+ if (likely(len >= skb->len))
+ return 0;
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->ip_summed = CHECKSUM_NONE;
+ return __pskb_trim(skb, len);
+}
+
#define skb_queue_walk(queue, skb) \
for (skb = (queue)->next; \
skb != (struct sk_buff *)(queue); \
@@ -2360,27 +2383,6 @@ __wsum __skb_checksum(const struct sk_buff *skb, int offset, int len,
__wsum skb_checksum(const struct sk_buff *skb, int offset, int len,
__wsum csum);
-/**
- * pskb_trim_rcsum - trim received skb and update checksum
- * @skb: buffer to trim
- * @len: new length
- *
- * This is exactly the same as pskb_trim except that it ensures the
- * checksum of received packets are still valid after the operation.
- */
-
-static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
-{
- if (likely(len >= skb->len))
- return 0;
- if (skb->ip_summed == CHECKSUM_COMPLETE) {
- __wsum adj = skb_checksum(skb, len, skb->len - len, 0);
-
- skb->csum = csum_sub(skb->csum, adj);
- }
- return __pskb_trim(skb, len);
-}
-
static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
int len, void *buffer)
{
@@ -2529,6 +2531,10 @@ static inline void sw_tx_timestamp(struct sk_buff *skb)
* Ethernet MAC Drivers should call this function in their hard_xmit()
* function immediately before giving the sk_buff to the MAC hardware.
*
+ * Specifically, one should make absolutely sure that this function is
+ * called before TX completion of this packet can trigger. Otherwise
+ * the packet could potentially already be freed.
+ *
* @skb: A socket buffer.
*/
static inline void skb_tx_timestamp(struct sk_buff *skb)