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authorDaniel Borkmann <dborkman@redhat.com>2013-10-30 14:50:51 +0400
committerDavid S. Miller <davem@davemloft.net>2013-11-04 08:04:57 +0400
commit2817a336d4d533fb8b68719723cd60ea7dd7c09e (patch)
tree71aac3aa2a48588fd0b5372cca9499bd1cbe2a5f /include/net/checksum.h
parentefba721f636ee016859d86d15748650119402b10 (diff)
downloadlinux-2817a336d4d533fb8b68719723cd60ea7dd7c09e.tar.xz
net: skb_checksum: allow custom update/combine for walking skb
Currently, skb_checksum walks over 1) linearized, 2) frags[], and 3) frag_list data and calculats the one's complement, a 32 bit result suitable for feeding into itself or csum_tcpudp_magic(), but unsuitable for SCTP as we're calculating CRC32c there. Hence, in order to not re-implement the very same function in SCTP (and maybe other protocols) over and over again, use an update() + combine() callback internally to allow for walking over the skb with different algorithms. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/checksum.h')
-rw-r--r--include/net/checksum.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 8f59ca50477c..15f33fde826e 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -79,6 +79,12 @@ csum_block_add(__wsum csum, __wsum csum2, int offset)
}
static inline __wsum
+csum_block_add_ext(__wsum csum, __wsum csum2, int offset, int len)
+{
+ return csum_block_add(csum, csum2, offset);
+}
+
+static inline __wsum
csum_block_sub(__wsum csum, __wsum csum2, int offset)
{
u32 sum = (__force u32)csum2;