Initial import

1 files changed, 75 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/checksum.h b/arch/alpha/include/asm/checksum.h
new file mode 100644
index 000000000..d3854bbf0
--- /dev/null
+++ b/arch/alpha/include/asm/checksum.h
@@ -0,0 +1,75 @@
+#ifndef _ALPHA_CHECKSUM_H
+#define _ALPHA_CHECKSUM_H
+
+#include <linux/in6.h>
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ */
+extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+					   unsigned short len,
+					   unsigned short proto,
+					   __wsum sum);
+
+__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+				unsigned short len, unsigned short proto,
+				__wsum sum);
+
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
+
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
+
+__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
+
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+/*
+ *	Fold a partial checksum without adding pseudo headers
+ */
+
+static inline __sum16 csum_fold(__wsum csum)
+{
+	u32 sum = (__force u32)csum;
+	sum = (sum & 0xffff) + (sum >> 16);
+	sum = (sum & 0xffff) + (sum >> 16);
+	return (__force __sum16)~sum;
+}
+
+#define _HAVE_ARCH_IPV6_CSUM
+extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+			       const struct in6_addr *daddr,
+			       __u32 len, unsigned short proto,
+			       __wsum sum);
+#endif