1/* 2 * IP checksumming functions. 3 * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; under version 2 of the License. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#ifndef QEMU_NET_CHECKSUM_H 19#define QEMU_NET_CHECKSUM_H 20 21#include <stdint.h> 22struct iovec; 23 24uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq); 25uint16_t net_checksum_finish(uint32_t sum); 26uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto, 27 uint8_t *addrs, uint8_t *buf); 28void net_checksum_calculate(uint8_t *data, int length); 29 30static inline uint32_t 31net_checksum_add(int len, uint8_t *buf) 32{ 33 return net_checksum_add_cont(len, buf, 0); 34} 35 36static inline uint16_t 37net_raw_checksum(uint8_t *data, int length) 38{ 39 return net_checksum_finish(net_checksum_add(length, data)); 40} 41 42/** 43 * net_checksum_add_iov: scatter-gather vector checksumming 44 * 45 * @iov: input scatter-gather array 46 * @iov_cnt: number of array elements 47 * @iov_off: starting iov offset for checksumming 48 * @size: length of data to be checksummed 49 */ 50uint32_t net_checksum_add_iov(const struct iovec *iov, 51 const unsigned int iov_cnt, 52 uint32_t iov_off, uint32_t size); 53 54#endif /* QEMU_NET_CHECKSUM_H */ 55