[PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function
From: Alexander Aring <hidden>
Date: 2013-08-16 19:59:56
Subsystem:
ieee 802.15.4 subsystem, networking [general], the rest · Maintainers:
Alexander Aring, Stefan Schmidt, Miquel Raynal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2013-08-14 · Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function · Alexander Aring <alex.aring@gmail.com>
- 2013-08-14 · Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function · Hannes Frederic Sowa <hidden>
- 2013-08-14 · Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function · Alexander Aring <alex.aring@gmail.com>
- 2013-08-14 · Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function · Hannes Frederic Sowa <hidden>
- 2013-08-14 · Re: [PATCH net-next 3/6] 6lowpan: introduce lowpan_fetch_skb function · Alexander Smirnov <hidden>
This patch adds a helper function to parse the ipv6 header to a 6lowpan header in stream. This function checks first if we can pull data with a specific length from a skb. If this seems to be okay, we copy skb data to a destination pointer and run skb_pull. Signed-off-by: Alexander Aring <redacted> Reviewed-by: Werner Almesberger <redacted> --- net/ieee802154/6lowpan.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index 4b8f917..a636545 100644
--- a/net/ieee802154/6lowpan.h
+++ b/net/ieee802154/6lowpan.h@@ -230,4 +230,16 @@ dest = 16 bit inline */ #define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */ +static inline bool lowpan_fetch_skb(struct sk_buff *skb, + void *data, const unsigned int len) +{ + if (unlikely(!pskb_may_pull(skb, len))) + return true; + + skb_copy_from_linear_data(skb, data, len); + skb_pull(skb, len); + + return false; +} + #endif /* __6LOWPAN_H__ */
--
1.8.3.3
------------------------------------------------------------------------------
Get 100% visibility into Java/.NET code with AppDynamics Lite!
It's a free troubleshooting tool designed for production.
Get down to code-level detail for bottlenecks, with <2% overhead.
Download for free and get started troubleshooting in minutes.
http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk