From: Simon Horman <horms@xxxxxxxxxxxx>
Change the type of the crc32 parameter of sctp_end_cksum()
from __be32 to __u32 to reflect that fact that it is passed
to cpu_to_le32().
There are five in-tree users of sctp_end_cksum().
The following four had warnings flagged by sparse which are
no longer present with this change.
net/netfilter/ipvs/ip_vs_proto_sctp.c:sctp_nat_csum()
net/netfilter/ipvs/ip_vs_proto_sctp.c:sctp_csum_check()
net/sctp/input.c:sctp_rcv_checksum()
net/sctp/output.c:sctp_packet_transmit()
The fifth user is net/netfilter/nf_nat_proto_sctp.c:sctp_manip_pkt().
It has been updated to pass a __u32 instead of a __be32,
the value in question was already calculated in cpu byte-order.
net/netfilter/nf_nat_proto_sctp.c:sctp_manip_pkt() has also
been updated to assign the return value of sctp_end_cksum()
directly to a variable of type __le32, matching the
type of the return value. Previously the return value
was assigned to a variable of type __be32 and then that variable
was finally assigned to another variable of type __le32.
Problems flagged by sparse.
Compile and sparse tested only.
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/net/sctp/checksum.h | 2 +-
net/netfilter/nf_nat_proto_sctp.c | 5 ++---
2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/include/net/sctp/checksum.h b/include/net/sctp/checksum.h
index befc8d2..5a2110d 100644
--- a/include/net/sctp/checksum.h
+++ b/include/net/sctp/checksum.h
@@ -77,7 +77,7 @@ static inline __u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
return sctp_crc32c(crc32, buffer, length);
}
-static inline __le32 sctp_end_cksum(__be32 crc32)
+static inline __le32 sctp_end_cksum(__u32 crc32)
{
return cpu_to_le32(~crc32);
}
diff --git a/net/netfilter/nf_nat_proto_sctp.c b/net/netfilter/nf_nat_proto_sctp.c
index e64faa5..396e55d 100644
--- a/net/netfilter/nf_nat_proto_sctp.c
+++ b/net/netfilter/nf_nat_proto_sctp.c
@@ -36,7 +36,7 @@ sctp_manip_pkt(struct sk_buff *skb,
{
struct sk_buff *frag;
sctp_sctphdr_t *hdr;
- __be32 crc32;
+ __u32 crc32;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
@@ -55,8 +55,7 @@ sctp_manip_pkt(struct sk_buff *skb,
skb_walk_frags(skb, frag)
crc32 = sctp_update_cksum((u8 *)frag->data, skb_headlen(frag),
crc32);
- crc32 = sctp_end_cksum(crc32);
- hdr->checksum = crc32;
+ hdr->checksum = sctp_end_cksum(crc32);
return true;
}
--
1.7.10.4
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