datapath: Remove checksum compat support

[sliver-openvswitch.git] / datapath / linux / compat / utils.c

diff --git a/datapath/linux/compat/utils.c b/datapath/linux/compat/utils.c
new file mode 100644 (file)
index 0000000..844d372
--- /dev/null
+++ b/datapath/linux/compat/utils.c
@@ -0,0 +1,39 @@
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/inet.h>
+#include <linux/mm.h>
+#include <linux/net.h>
+#include <net/checksum.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/percpu.h>
+#include <linux/init.h>
+#include <linux/ratelimit.h>
+
+#include <net/sock.h>
+
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
+void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
+                              const __be32 *from, const __be32 *to,
+                              int pseudohdr)
+{
+       __be32 diff[] = {
+               ~from[0], ~from[1], ~from[2], ~from[3],
+               to[0], to[1], to[2], to[3],
+       };
+       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)));
+}
+#endif