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authorAlexander Aring <alex.aring@gmail.com>2013-08-16 21:59:56 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-20 13:23:11 -0700
commit4666669fc3b83f0d01b08c6b17432563f2eedcba (patch)
tree393f1fb642ac6aeff475f72e5b4a297385c2d5e0 /net/ieee802154
parent31afe1f73e46221650acfcb411e6949f4a8f7571 (diff)
6lowpan: introduce lowpan_fetch_skb function
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 <alex.aring@gmail.com> Reviewed-by: Werner Almesberger <werner@almesberger.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ieee802154')
-rw-r--r--net/ieee802154/6lowpan.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index 4b8f917658b5..a636545d8dcf 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__ */