Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 154 insertions, 0 deletions

diff --git a/pfinet/linux-src/include/asm-m68k/checksum.h b/pfinet/linux-src/include/asm-m68k/checksum.h
new file mode 100644
index 00000000..f5236490
--- /dev/null
+++ b/pfinet/linux-src/include/asm-m68k/checksum.h
@@ -0,0 +1,154 @@
+#ifndef _M68K_CHECKSUM_H
+#define _M68K_CHECKSUM_H
+
+/*
+ * 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
+ *
+ * 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, int sum);
+
+
+/*
+ * the same as csum_partial_copy, but copies from user space.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
+						int len, int sum, int *csum_err);
+
+#define csum_partial_copy_nocheck(src, dst, len, sum)	\
+	csum_partial_copy((src), (dst), (len), (sum))
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ *
+ */
+static inline unsigned short
+ip_fast_csum(unsigned char *iph, unsigned int ihl)
+{
+	unsigned int sum = 0;
+
+	__asm__ ("subqw #1,%2\n"
+		 "1:\t"
+		 "movel %1@+,%/d0\n\t"
+		 "addxl %/d0,%0\n\t"
+		 "dbra  %2,1b\n\t"
+		 "movel %0,%/d0\n\t"
+		 "swap  %/d0\n\t"
+		 "addxw %/d0,%0\n\t"
+		 "clrw  %/d0\n\t"
+		 "addxw %/d0,%0\n\t"
+		 : "=d" (sum), "=a" (iph), "=d" (ihl)
+		 : "0" (sum), "1" (iph), "2" (ihl)
+		 : "d0");
+	return ~sum;
+}
+
+/*
+ *	Fold a partial checksum
+ */
+
+static inline unsigned int csum_fold(unsigned int sum)
+{
+	unsigned int tmp = sum;
+	__asm__("swap %1\n\t"
+		"addw %1, %0\n\t"
+		"clrw %1\n\t"
+		"addxw %1, %0"
+		: "=&d" (sum), "=&d" (tmp)
+		: "0" (sum), "1" (sum));
+	return ~sum;
+}
+
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+
+static inline unsigned int
+csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
+		  unsigned short proto, unsigned int sum)
+{
+	__asm__ ("addl  %1,%0\n\t"
+		 "addxl %4,%0\n\t"
+		 "addxl %5,%0\n\t"
+		 "clrl %1\n\t"
+		 "addxl %1,%0"
+		 : "=&d" (sum), "=&d" (saddr)
+		 : "0" (daddr), "1" (saddr), "d" (len + proto),
+		   "d"(sum));
+	return sum;
+}
+
+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
+static __inline__ unsigned short int
+csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
+		__u16 len, unsigned short proto, unsigned int sum) 
+{
+	register unsigned long tmp;
+	__asm__("addl %2@,%0\n\t"
+		"movel %2@(4),%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %2@(8),%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %2@(12),%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %3@,%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %3@(4),%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %3@(8),%1\n\t"
+		"addxl %1,%0\n\t"
+		"movel %3@(12),%1\n\t"
+		"addxl %1,%0\n\t"
+		"addxl %4,%0\n\t"
+		"clrl %1\n\t"
+		"addxl %1,%0"
+		: "=&d" (sum), "=&d" (tmp)
+		: "a" (saddr), "a" (daddr), "d" ((__u32) len + proto),
+		  "0" (sum));
+
+	return csum_fold(sum);
+}
+
+#endif /* _M68K_CHECKSUM_H */