These are convenience functions for update a checksum in ILA where we
are overwriting the locator (first eight bytes of an ILA IPv6 address).
Signed-off-by: Tom Herbert <t...@herbertland.com>
---
include/net/checksum.h | 3 +++
net/core/utils.c | 19 +++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 2d1d73c..af76b8e 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -141,6 +141,9 @@ static inline void csum_replace2(__sum16 *sum, __be16 old,
__be16 new)
struct sk_buff;
void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, int pseudohdr);
+void inet_proto_csum_replace8(__sum16 *sum, struct sk_buff *skb,
+ const __be32 *from, const __be32 *to,
+ int pseudohdr);
void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
const __be32 *from, const __be32 *to,
int pseudohdr);
diff --git a/net/core/utils.c b/net/core/utils.c
index a7732a0..79d1067 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -336,6 +336,25 @@ void inet_proto_csum_replace16(__sum16 *sum, struct
sk_buff *skb,
}
EXPORT_SYMBOL(inet_proto_csum_replace16);
+void inet_proto_csum_replace8(__sum16 *sum, struct sk_buff *skb,
+ const __be32 *from, const __be32 *to,
+ int pseudohdr)
+{
+ __be32 diff[] = {
+ ~from[0], ~from[1], to[0], to[1],
+ };
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
+ *sum = csum_fold(csum_partial(diff, sizeof(diff),
+ ~csum_unfold(*sum)));
+ if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
+ skb->csum = ~csum_partial(diff, sizeof(diff),
+ ~skb->csum);
+ } else if (pseudohdr)
+ *sum = ~csum_fold(csum_partial(diff, sizeof(diff),
+ csum_unfold(*sum)));
+}
+EXPORT_SYMBOL(inet_proto_csum_replace8);
+
struct __net_random_once_work {
struct work_struct work;
struct static_key *key;
--
1.8.1
--
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