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authorJason Wang <jasowang@redhat.com>2013-03-26 19:11:21 -0400
committerDavid S. Miller <davem@davemloft.net>2013-03-27 12:48:31 -0400
commit5203cd28db6dc05c3618a602cf4cf81203d00257 (patch)
tree062761308de223744f78111cbbd2ab37772a03d4
parente5d5decaedf41f5b03e6819789cc3ba8744d9f54 (diff)
net: core: introduce skb_probe_transport_header()
Sometimes, we need probe and set the transport header for packets (e.g from untrusted source). This patch introduces a new helper skb_probe_transport_header() which tries to probe and set the l4 header through skb_flow_dissect(), if not just set the transport header to the hint passed by caller. Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/skbuff.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 497412165b1c..fa88b966cb8e 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -32,6 +32,7 @@
32#include <linux/hrtimer.h> 32#include <linux/hrtimer.h>
33#include <linux/dma-mapping.h> 33#include <linux/dma-mapping.h>
34#include <linux/netdev_features.h> 34#include <linux/netdev_features.h>
35#include <net/flow_keys.h>
35 36
36/* Don't change this without changing skb_csum_unnecessary! */ 37/* Don't change this without changing skb_csum_unnecessary! */
37#define CHECKSUM_NONE 0 38#define CHECKSUM_NONE 0
@@ -1559,6 +1560,19 @@ static inline void skb_set_transport_header(struct sk_buff *skb,
1559 skb->transport_header += offset; 1560 skb->transport_header += offset;
1560} 1561}
1561 1562
1563static inline void skb_probe_transport_header(struct sk_buff *skb,
1564 const int offset_hint)
1565{
1566 struct flow_keys keys;
1567
1568 if (skb_transport_header_was_set(skb))
1569 return;
1570 else if (skb_flow_dissect(skb, &keys))
1571 skb_set_transport_header(skb, keys.thoff);
1572 else
1573 skb_set_transport_header(skb, offset_hint);
1574}
1575
1562static inline unsigned char *skb_network_header(const struct sk_buff *skb) 1576static inline unsigned char *skb_network_header(const struct sk_buff *skb)
1563{ 1577{
1564 return skb->head + skb->network_header; 1578 return skb->head + skb->network_header;