patch-1.3.2 linux/include/asm-alpha/checksum.h

• Lines: 54
• Date: Fri Jun 16 21:11:21 1995
• Orig file: v1.3.1/linux/include/asm-alpha/checksum.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.1/linux/include/asm-alpha/checksum.h linux/include/asm-alpha/checksum.h
@@ -0,0 +1,53 @@
+#ifndef _ALPHA_CHECKSUM_H
+#define _ALPHA_CHECKSUM_H
+
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ */
+extern inline 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);
+
+/*
+ * 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(unsigned char * buff, int len, unsigned int sum);
+
+/*
+ * the same as csum_partial, but copies from fs:src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+extern unsigned int csum_partial_copyffs( char *src, char *dst, int len, 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);
+
+#endif