Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 162 insertions, 0 deletions

diff --git a/pfinet/linux-src/include/asm-arm/checksum.h b/pfinet/linux-src/include/asm-arm/checksum.h
new file mode 100644
index 00000000..2323bb5d
--- /dev/null
+++ b/pfinet/linux-src/include/asm-arm/checksum.h
@@ -0,0 +1,162 @@
+/*
+ * linux/include/asm-arm/checksum.h
+ *
+ * IP checksum routines
+ *
+ * Copyright (C) Original authors of ../asm-i386/checksum.h
+ * Copyright (C) 1996,1997,1998 Russell King
+ */
+#ifndef __ASM_ARM_CHECKSUM_H
+#define __ASM_ARM_CHECKSUM_H
+
+#ifndef __ASM_ARM_SEGMENT_H
+#include <asm/segment.h>
+#endif
+
+/*
+ * 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
+ */
+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, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+unsigned int
+csum_partial_copy_nocheck(const char *src, char *dst, int len, int sum);
+
+unsigned int
+csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr);
+
+#if 0
+/*
+ * This combination is currently not used, but possible:
+ */
+unsigned int
+csum_partial_copy_to_user(const char *src, char *dst, int len, int sum, int *err_ptr);
+#endif
+
+/*
+ * These are the old (and unsafe) way of doing checksums, a warning message will be
+ * printed if they are used and an exception occurs.
+ *
+ * these functions should go away after some time.
+ */
+#define csum_partial_copy_fromuser csum_partial_copy
+unsigned int
+csum_partial_copy(const char *src, char *dst, int len, int sum);
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ *
+ *	Converted and optimised for ARM by R. M. King.
+ *
+ *	Note: the order that the LDM registers are loaded with respect to
+ *	the adc's doesn't matter.
+ */
+static inline unsigned short
+ip_fast_csum(unsigned char * iph, unsigned int ihl)
+{
+	unsigned int sum, tmp1;
+
+    __asm__ __volatile__("
+	sub	%2, %2, #5
+	ldr	%0, [%1], #4
+	ldr	%3, [%1], #4
+	adds	%0, %0, %3
+	ldr	%3, [%1], #4
+	adcs	%0, %0, %3
+	ldr	%3, [%1], #4
+	adcs	%0, %0, %3
+1:	ldr	%3, [%1], #4
+	adcs	%0, %0, %3
+	tst	%2, #15
+	subne	%2, %2, #1
+	bne	1b
+	adc	%0, %0, #0
+	adds	%0, %0, %0, lsl #16
+	addcs	%0, %0, #0x10000
+	mvn	%0, %0
+	mov	%0, %0, lsr #16
+	"
+	: "=&r" (sum), "=&r" (iph), "=&r" (ihl), "=&r" (tmp1)
+	: "1" (iph), "2" (ihl));
+	return(sum);
+}
+
+/*
+ * 	Fold a partial checksum without adding pseudo headers
+ */
+static inline unsigned int
+csum_fold(unsigned int sum)
+{
+	__asm__("
+	adds	%0, %0, %0, lsl #16
+	addcs	%0, %0, #0x10000"
+	: "=r" (sum)
+	: "0" (sum));
+	return (~sum) >> 16;
+}
+
+static inline unsigned long
+csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
+		   unsigned short proto, unsigned int sum)
+{
+	__asm__("
+	adds	%0, %0, %1
+	adcs	%0, %0, %2
+	adcs	%0, %0, %3
+	adc	%0, %0, #0"
+	: "=&r"(sum)
+	: "r" (daddr), "r" (saddr), "r" ((ntohs(len)<<16)+proto*256), "0" (sum));
+	return sum;
+}	
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline unsigned short int
+csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
+		  unsigned short proto, unsigned int sum)
+{
+	return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
+}
+
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+static inline unsigned short
+ip_compute_csum(unsigned char * buff, int len)
+{
+	return csum_fold(csum_partial(buff, len, 0));
+}
+
+#define _HAVE_ARCH_IPV6_CSUM
+extern unsigned long
+__csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u32 len,
+		__u32 proto, unsigned int sum);
+
+extern __inline__ unsigned short int
+csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, __u16 len,
+		unsigned short proto, unsigned int sum)
+{
+	return csum_fold(__csum_ipv6_magic(saddr, daddr, htonl((__u32)len),
+					   htonl(proto), sum));
+}
+#endif