Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/net/checksum.h b/include/net/checksum.h
new file mode 100644
index 0000000..e3ea7cc
--- /dev/null
+++ b/include/net/checksum.h
@@ -0,0 +1,87 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Checksumming functions for IP, TCP, UDP and so on
+ *
+ * Authors: Jorge Cwik, <jorge@laser.satlink.net>
+ * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
+ * Borrows very liberally from tcp.c and ip.c, see those
+ * files for more names.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _CHECKSUM_H
+#define _CHECKSUM_H
+
+#include <linux/errno.h>
+#include <asm/types.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+
+#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
+static inline
+unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned char *dst,
+ int len, int sum, int *err_ptr)
+{
+ if (access_ok(VERIFY_READ, src, len))
+ return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
+
+ if (len)
+ *err_ptr = -EFAULT;
+
+ return sum;
+}
+#endif
+
+#ifndef HAVE_CSUM_COPY_USER
+static __inline__ unsigned int csum_and_copy_to_user
+(const unsigned char *src, unsigned char __user *dst, int len, unsigned int sum, int *err_ptr)
+{
+ sum = csum_partial(src, len, sum);
+
+ if (access_ok(VERIFY_WRITE, dst, len)) {
+ if (copy_to_user(dst, src, len) == 0)
+ return sum;
+ }
+ if (len)
+ *err_ptr = -EFAULT;
+
+ return -1; /* invalid checksum */
+}
+#endif
+
+static inline unsigned int csum_add(unsigned int csum, unsigned int addend)
+{
+ csum += addend;
+ return csum + (csum < addend);
+}
+
+static inline unsigned int csum_sub(unsigned int csum, unsigned int addend)
+{
+ return csum_add(csum, ~addend);
+}
+
+static inline unsigned int
+csum_block_add(unsigned int csum, unsigned int csum2, int offset)
+{
+ if (offset&1)
+ csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
+ return csum_add(csum, csum2);
+}
+
+static inline unsigned int
+csum_block_sub(unsigned int csum, unsigned int csum2, int offset)
+{
+ if (offset&1)
+ csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
+ return csum_sub(csum, csum2);
+}
+
+#endif