xref: /openbmc/qemu/include/net/checksum.h (revision 88c1ee73)
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>
22 struct iovec;
23 
24 uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq);
25 uint16_t net_checksum_finish(uint32_t sum);
26 uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
27                              uint8_t *addrs, uint8_t *buf);
28 void net_checksum_calculate(uint8_t *data, int length);
29 
30 static inline uint32_t
31 net_checksum_add(int len, uint8_t *buf)
32 {
33     return net_checksum_add_cont(len, buf, 0);
34 }
35 
36 static inline uint16_t
37 net_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  */
50 uint32_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