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authorJoe Stringer <joe@wand.net.nz>2013-07-25 10:52:05 +0900
committerDavid S. Miller <davem@davemloft.net>2013-07-27 20:07:15 -0700
commit024ec3deac33ddbd81f3c887506f132b24ea21a7 (patch)
tree32e21519a6180435415dc89628929d0e6ed56ecf /include/net/sctp
parente7428e95a06fb516fac1308bd0e176e27c0b9287 (diff)
net/sctp: Refactor SCTP skb checksum computation
This patch consolidates the SCTP checksum calculation code from various places to a single new function, sctp_compute_cksum(skb, offset). Signed-off-by: Joe Stringer <joe@wand.net.nz> Reviewed-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/checksum.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
index 78b88aa8c810..483e6303458d 100644
--- a/include/net/sctp/checksum.h
+++ b/include/net/sctp/checksum.h
@@ -85,4 +85,19 @@ static inline __le32 sctp_end_cksum(__u32 crc32)
return cpu_to_le32(~crc32);
}
+/* Calculate the CRC32C checksum of an SCTP packet. */
+static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
+ unsigned int offset)
+{
+ const struct sk_buff *iter;
+
+ __u32 crc32 = sctp_start_cksum(skb->data + offset,
+ skb_headlen(skb) - offset);
+ skb_walk_frags(skb, iter)
+ crc32 = sctp_update_cksum((__u8 *) iter->data,
+ skb_headlen(iter), crc32);
+
+ return sctp_end_cksum(crc32);
+}
+
#endif /* __sctp_checksum_h__ */