mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
Update compute_ip_checksum.c and ip_checksum.h to the versions from
kexec-tools 1.101 (the current version). Document the origin of the files in HACKING and in the files themselves. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@203 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
parent
273a9b4356
commit
3acfef5b84
3 changed files with 102 additions and 26 deletions
4
HACKING
4
HACKING
|
@ -49,3 +49,7 @@ Third-party Code and License Overview
|
||||||
Source: LZMA SDK, http://sourceforge.net/projects/sevenzip/
|
Source: LZMA SDK, http://sourceforge.net/projects/sevenzip/
|
||||||
Current version we use: LZMA SDK 4.40 (05/2006)
|
Current version we use: LZMA SDK 4.40 (05/2006)
|
||||||
|
|
||||||
|
* lib/compute_ip_checksum.c, include/ip_checksum.h: GPLv2
|
||||||
|
Source: kexec-tools, http://www.xmission.com/~ebiederm/files/kexec/
|
||||||
|
Current version we use: kexec-tools 1.101
|
||||||
|
|
||||||
|
|
|
@ -1,8 +1,29 @@
|
||||||
|
/*
|
||||||
|
* This file is part of the LinuxBIOS project.
|
||||||
|
*
|
||||||
|
* It was taken from kexec-tools 1.101.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2003,2004 Eric Biederman <ebiederm@xmission.com>
|
||||||
|
*
|
||||||
|
* 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; version 2 of the License.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program; if not, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
#ifndef IP_CHECKSUM_H
|
#ifndef IP_CHECKSUM_H
|
||||||
#define IP_CHECKSUM_H
|
#define IP_CHECKSUM_H
|
||||||
|
|
||||||
unsigned long compute_ip_checksum(void *addr, unsigned long length);
|
unsigned long compute_ip_checksum(void *addr, unsigned long length);
|
||||||
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new);
|
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new);
|
||||||
|
unsigned long negate_ip_checksum(unsigned long sum);
|
||||||
|
|
||||||
#endif /* IP_CHECKSUM_H */
|
#endif /* IP_CHECKSUM_H */
|
||||||
|
|
||||||
|
|
|
@ -1,36 +1,78 @@
|
||||||
|
/*
|
||||||
|
* This file is part of the LinuxBIOS project.
|
||||||
|
*
|
||||||
|
* It was taken from kexec-tools 1.101.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2003,2004 Eric Biederman <ebiederm@xmission.com>
|
||||||
|
*
|
||||||
|
* 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; version 2 of the License.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful,
|
||||||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
* GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
* You should have received a copy of the GNU General Public License
|
||||||
|
* along with this program; if not, write to the Free Software
|
||||||
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
#include <stdint.h>
|
#include <stdint.h>
|
||||||
#include <ip_checksum.h>
|
#include <ip_checksum.h>
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
unsigned long compute_ip_checksum(void *addr, unsigned long length)
|
unsigned long compute_ip_checksum(void *addr, unsigned long length)
|
||||||
{
|
{
|
||||||
uint8_t *ptr;
|
uint16_t *ptr;
|
||||||
volatile union {
|
|
||||||
uint8_t byte[2];
|
|
||||||
uint16_t word;
|
|
||||||
} value;
|
|
||||||
unsigned long sum;
|
unsigned long sum;
|
||||||
unsigned long i;
|
unsigned long len;
|
||||||
/* In the most straight forward way possible,
|
unsigned long laddr;
|
||||||
* compute an ip style checksum.
|
/* compute an ip style checksum */
|
||||||
*/
|
laddr = (unsigned long )addr;
|
||||||
sum = 0;
|
sum = 0;
|
||||||
|
if (laddr & 1) {
|
||||||
|
uint16_t buffer;
|
||||||
|
unsigned char *ptr;
|
||||||
|
/* copy the first byte into a 2 byte buffer.
|
||||||
|
* This way automatically handles the endian question
|
||||||
|
* of which byte (low or high) the last byte goes in.
|
||||||
|
*/
|
||||||
|
buffer = 0;
|
||||||
ptr = addr;
|
ptr = addr;
|
||||||
for(i = 0; i < length; i++) {
|
memcpy(&buffer, ptr, 1);
|
||||||
unsigned long value;
|
sum += buffer;
|
||||||
value = ptr[i];
|
if (sum > 0xFFFF)
|
||||||
if (i & 1) {
|
sum -= 0xFFFF;
|
||||||
value <<= 8;
|
length -= 1;
|
||||||
|
addr = ptr +1;
|
||||||
|
|
||||||
}
|
}
|
||||||
/* Add the new value */
|
len = length >> 1;
|
||||||
sum += value;
|
ptr = addr;
|
||||||
/* Wrap around the carry */
|
while (len--) {
|
||||||
if (sum > 0xFFFF) {
|
sum += *(ptr++);
|
||||||
sum = (sum + (sum >> 16)) & 0xFFFF;
|
if (sum > 0xFFFF)
|
||||||
|
sum -= 0xFFFF;
|
||||||
}
|
}
|
||||||
|
addr = ptr;
|
||||||
|
if (length & 1) {
|
||||||
|
uint16_t buffer;
|
||||||
|
unsigned char *ptr;
|
||||||
|
/* copy the last byte into a 2 byte buffer.
|
||||||
|
* This way automatically handles the endian question
|
||||||
|
* of which byte (low or high) the last byte goes in.
|
||||||
|
*/
|
||||||
|
buffer = 0;
|
||||||
|
ptr = addr;
|
||||||
|
memcpy(&buffer, ptr, 1);
|
||||||
|
sum += buffer;
|
||||||
|
if (sum > 0xFFFF)
|
||||||
|
sum -= 0xFFFF;
|
||||||
}
|
}
|
||||||
value.byte[0] = sum & 0xff;
|
return (~sum) & 0xFFFF;
|
||||||
value.byte[1] = (sum >> 8) & 0xff;
|
|
||||||
return (~value.word) & 0xFFFF;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new)
|
unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new)
|
||||||
|
@ -51,3 +93,12 @@ unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned
|
||||||
}
|
}
|
||||||
return (~checksum) & 0xFFFF;
|
return (~checksum) & 0xFFFF;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
unsigned long negate_ip_checksum(unsigned long sum)
|
||||||
|
{
|
||||||
|
sum = ~sum & 0xFFFF;
|
||||||
|
|
||||||
|
sum = 0xFFFF - sum;
|
||||||
|
|
||||||
|
return ~sum & 0xFFFF;
|
||||||
|
}
|
||||||
|
|
Loading…
Add table
Reference in a new issue