patch-2.3.16 linux/include/asm-sh/checksum.h

• Lines: 85
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/checksum.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/checksum.h linux/include/asm-sh/checksum.h
@@ -0,0 +1,84 @@
+#ifndef __ASM_SH_CHECKSUM_H
+#define __ASM_SH_CHECKSUM_H
+
+
+/*
+ *	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);
+
+/*
+ * 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);
+
+/*
+ * 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
+ */
+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 alpha
+ * 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+ * this is obsolete and will go away.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.
+ */
+unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *errp);
+
+/*
+ * 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_SH_CHECKSUM_H */