2 * Copyright (c) 2008, 2011, 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 #include "openvswitch/types.h"
26 ovs_be16
csum(const void *, size_t);
27 uint32_t csum_continue(uint32_t partial
, const void *, size_t);
28 ovs_be16
csum_finish(uint32_t partial
);
29 ovs_be16
recalc_csum16(ovs_be16 old_csum
, ovs_be16 old_u16
, ovs_be16 new_u16
);
30 ovs_be16
recalc_csum32(ovs_be16 old_csum
, ovs_be32 old_u32
, ovs_be32 new_u32
);
31 ovs_be16
recalc_csum48(ovs_be16 old_csum
, const struct eth_addr old_mac
,
32 const struct eth_addr new_mac
);
33 ovs_be16
recalc_csum128(ovs_be16 old_csum
, ovs_16aligned_be32 old_u32
[4],
34 const struct in6_addr
*);
37 /* Adds the 16 bits in 'new' to the partial IP checksum 'partial' and returns
38 * the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
39 * obtain the finished checksum, pass the return value to csum_finish().) */
40 static inline uint32_t
41 csum_add16(uint32_t partial
, ovs_be16
new)
46 /* Adds the 32 bits in 'new' to the partial IP checksum 'partial' and returns
47 * the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
48 * obtain the finished checksum, pass the return value to csum_finish().) */
49 static inline uint32_t
50 csum_add32(uint32_t partial
, ovs_be32
new)
52 return partial
+ (new >> 16) + (new & 0xffff);
55 uint32_t csum_add16(uint32_t partial
, ovs_be16
);
56 uint32_t csum_add32(uint32_t partial
, ovs_be32
);