patch-2.3.43 linux/include/asm-ia64/checksum.h

• Lines: 100
• Date: Sun Feb 6 18:42:40 2000
• Orig file: v2.3.42/linux/include/asm-ia64/checksum.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/include/asm-ia64/checksum.h linux/include/asm-ia64/checksum.h
@@ -0,0 +1,99 @@
+#ifndef _ASM_IA64_CHECKSUM_H
+#define _ASM_IA64_CHECKSUM_H
+
+/*
+ * Copyright (C) 1998, 1999 Hewlett-Packard Co
+ * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+/*
+ * This is a version of ip_compute_csum() optimized for IP headers,
+ * which always checksum on 4 octet boundaries.
+ */
+extern unsigned short ip_fast_csum (unsigned char * iph, unsigned int ihl);
+
+/*
+ * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
+ * checksum, already complemented
+ */
+extern unsigned short int csum_tcpudp_magic (unsigned long saddr,
+					     unsigned long daddr,
+					     unsigned short len,
+					     unsigned short proto,
+					     unsigned int sum);
+
+extern unsigned int csum_tcpudp_nofold (unsigned long saddr,
+					unsigned long daddr,
+					unsigned short len,
+					unsigned short proto,
+					unsigned int 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 unsigned int csum_partial (const unsigned char * buff, int len,
+				  unsigned int sum);
+
+/*
+ * Same as csum_partial, but copies from src while it checksums.
+ *
+ * Here it is even more important to align src and dst on a 32-bit (or
+ * even better 64-bit) boundary.
+ */
+extern unsigned int csum_partial_copy (const char *src, char *dst, int len,
+				       unsigned int sum);
+
+/*
+ * The same as csum_partial, but copies from user space (but on the
+ * ia-64 we have just one address space, so this is identical to the
+ * above).
+ *
+ * This is obsolete and will go away.
+ */
+#define csum_partial_copy_fromuser csum_partial_copy
+
+/*
+ * This is a new version of the above that records errors it finds in
+ * *errp, but continues and zeros the rest of the buffer.
+ */
+extern unsigned int csum_partial_copy_from_user (const char *src, char *dst,
+						 int len, unsigned int sum,
+						 int *errp);
+
+extern unsigned int csum_partial_copy_nocheck (const char *src, char *dst,
+					       int len, unsigned int sum);
+
+/*
+ * This routine is used for miscellaneous IP-like checksums, mainly in
+ * icmp.c
+ */
+extern unsigned short ip_compute_csum (unsigned char *buff, int len);
+
+/*
+ * Fold a partial checksum without adding pseudo headers.
+ */
+static inline unsigned short
+csum_fold (unsigned int sum)
+{
+	sum = (sum & 0xffff) + (sum >> 16);
+	sum = (sum & 0xffff) + (sum >> 16);
+	return ~sum;
+}
+
+#define _HAVE_ARCH_IPV6_CSUM
+extern unsigned short int csum_ipv6_magic (struct in6_addr *saddr,
+					   struct in6_addr *daddr,
+					   __u16 len,
+					   unsigned short proto,
+					   unsigned int sum);
+
+#endif /* _ASM_IA64_CHECKSUM_H */