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       1                 :            : /*
       2                 :            :  * Copyright (c) 2008, 2011, 2015 Nicira, Inc.
       3                 :            :  *
       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:
       7                 :            :  *
       8                 :            :  *     http://www.apache.org/licenses/LICENSE-2.0
       9                 :            :  *
      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.
      15                 :            :  */
      16                 :            : 
      17                 :            : #ifndef CSUM_H
      18                 :            : #define CSUM_H 1
      19                 :            : 
      20                 :            : #include <stddef.h>
      21                 :            : #include <stdint.h>
      22                 :            : #include "openvswitch/types.h"
      23                 :            : 
      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]);
      33                 :            : 
      34                 :            : #ifndef __CHECKER__
      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                 :     276720 : csum_add16(uint32_t partial, ovs_be16 new)
      40                 :            : {
      41                 :     276720 :     return partial + new;
      42                 :            : }
      43                 :            : 
      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                 :      12333 : csum_add32(uint32_t partial, ovs_be32 new)
      49                 :            : {
      50                 :      12333 :     return partial + (new >> 16) + (new & 0xffff);
      51                 :            : }
      52                 :            : #else
      53                 :            : uint32_t csum_add16(uint32_t partial, ovs_be16);
      54                 :            : uint32_t csum_add32(uint32_t partial, ovs_be32);
      55                 :            : #endif
      56                 :            : 
      57                 :            : #endif /* csum.h */