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-rw-r--r--include/net/ip6_checksum.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
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+++ b/include/net/ip6_checksum.h
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+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Checksumming functions for IPv6
+ *
+ * Authors: Jorge Cwik, <jorge@laser.satlink.net>
+ * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
+ * Borrows very liberally from tcp.c and ip.c, see those
+ * files for more names.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * Fixes:
+ *
+ * Ralf Baechle : generic ipv6 checksum
+ * <ralf@waldorf-gmbh.de>
+ */
+
+#ifndef _CHECKSUM_IPV6_H
+#define _CHECKSUM_IPV6_H
+
+#include <asm/types.h>
+#include <asm/byteorder.h>
+#include <net/ip.h>
+#include <asm/checksum.h>
+#include <linux/in6.h>
+
+#ifndef _HAVE_ARCH_IPV6_CSUM
+
+static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
+ struct in6_addr *daddr,
+ __u16 len,
+ unsigned short proto,
+ unsigned int csum)
+{
+
+ int carry;
+ __u32 ulen;
+ __u32 uproto;
+
+ csum += saddr->s6_addr32[0];
+ carry = (csum < saddr->s6_addr32[0]);
+ csum += carry;
+
+ csum += saddr->s6_addr32[1];
+ carry = (csum < saddr->s6_addr32[1]);
+ csum += carry;
+
+ csum += saddr->s6_addr32[2];
+ carry = (csum < saddr->s6_addr32[2]);
+ csum += carry;
+
+ csum += saddr->s6_addr32[3];
+ carry = (csum < saddr->s6_addr32[3]);
+ csum += carry;
+
+ csum += daddr->s6_addr32[0];
+ carry = (csum < daddr->s6_addr32[0]);
+ csum += carry;
+
+ csum += daddr->s6_addr32[1];
+ carry = (csum < daddr->s6_addr32[1]);
+ csum += carry;
+
+ csum += daddr->s6_addr32[2];
+ carry = (csum < daddr->s6_addr32[2]);
+ csum += carry;
+
+ csum += daddr->s6_addr32[3];
+ carry = (csum < daddr->s6_addr32[3]);
+ csum += carry;
+
+ ulen = htonl((__u32) len);
+ csum += ulen;
+ carry = (csum < ulen);
+ csum += carry;
+
+ uproto = htonl(proto);
+ csum += uproto;
+ carry = (csum < uproto);
+ csum += carry;
+
+ return csum_fold(csum);
+}
+
+#endif
+#endif
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