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"
24 ovs_be16 csum(const void *, size_t);
25 uint32_t csum_continue(uint32_t partial, const void *, size_t);
26 ovs_be16 csum_finish(uint32_t partial);
27 ovs_be16 recalc_csum16(ovs_be16 old_csum, ovs_be16 old_u16, ovs_be16 new_u16);
28 ovs_be16 recalc_csum32(ovs_be16 old_csum, ovs_be32 old_u32, ovs_be32 new_u32);
29 ovs_be16 recalc_csum48(ovs_be16 old_csum, const struct eth_addr old_mac,
30 const struct eth_addr new_mac);
31 ovs_be16 recalc_csum128(ovs_be16 old_csum, ovs_16aligned_be32 old_u32[4],
32 const ovs_be32 new_u32[4]);
35 /* Adds the 16 bits in 'new' to the partial IP checksum 'partial' and returns
36 * the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
37 * obtain the finished checksum, pass the return value to csum_finish().) */
38 static inline uint32_t
39 csum_add16(uint32_t partial, ovs_be16 new)
44 /* Adds the 32 bits in 'new' to the partial IP checksum 'partial' and returns
45 * the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
46 * obtain the finished checksum, pass the return value to csum_finish().) */
47 static inline uint32_t
48 csum_add32(uint32_t partial, ovs_be32 new)
50 return partial + (new >> 16) + (new & 0xffff);
53 uint32_t csum_add16(uint32_t partial, ovs_be16);
54 uint32_t csum_add32(uint32_t partial, ovs_be32);