diff options
| author | Jason Wang <jasowang@redhat.com> | 2013-03-26 23:11:21 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-03-27 12:48:31 -0400 |
| commit | 5203cd28db6dc05c3618a602cf4cf81203d00257 (patch) | |
| tree | 062761308de223744f78111cbbd2ab37772a03d4 | |
| parent | e5d5decaedf41f5b03e6819789cc3ba8744d9f54 (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.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 497412165b1..fa88b966cb8 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -32,6 +32,7 @@ #include <linux/hrtimer.h> #include <linux/dma-mapping.h> #include <linux/netdev_features.h> +#include <net/flow_keys.h> /* Don't change this without changing skb_csum_unnecessary! */ #define CHECKSUM_NONE 0 @@ -1559,6 +1560,19 @@ static inline void skb_set_transport_header(struct sk_buff *skb, skb->transport_header += offset; } +static inline void skb_probe_transport_header(struct sk_buff *skb, + const int offset_hint) +{ + struct flow_keys keys; + + if (skb_transport_header_was_set(skb)) + return; + else if (skb_flow_dissect(skb, &keys)) + skb_set_transport_header(skb, keys.thoff); + else + skb_set_transport_header(skb, offset_hint); +} + static inline unsigned char *skb_network_header(const struct sk_buff *skb) { return skb->head + skb->network_header; |