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/*
* Copyright 2013 Google Inc.
*
* 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.
*
* 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Helpers to calculate IP, TCP, and UDP checksums.
*/
#ifndef __CHECKSUM_H__
#define __CHECKSUM_H__
#include "types.h"
#include <netinet/in.h>
#include <sys/types.h>
/* IPv4 ... */
/* Calculates and returns IPv4 header checksum (in network byte order). */
extern __be16 ipv4_checksum(void *ip_header, size_t ip_header_bytes);
/* Calculates TCP or UDP checksum for IPv4 (in network byte order). */
extern __be16 tcp_udp_v4_checksum(struct in_addr src_ip, struct in_addr dst_ip,
u8 protocol, const void *payload, u16 len);
/* IPv6 ... */
/* Calculates TCP, UDP, or ICMP checksum for IPv6 (in network byte order). */
extern __be16 tcp_udp_v6_checksum(const struct in6_addr *src_ip,
const struct in6_addr *dst_ip,
u8 protocol, const void *payload, u32 len);
/* SCTP ... */
/* Calculates the CRC32C checksum used by SCTP (in network byte order). */
extern __be32 sctp_crc32c(const void *packet, u32 len);
#endif /* __CHECKSUM_H__ */
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