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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Compute TCP checksum in software when offloading is disabled for a connection */
#ifndef __HICN_HS_UTILS_H__
#define __HICN_HS_UTILS_H__
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip6.h>
#include <vnet/tcp/tcp.h>
always_inline u16
ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0,
ip46_address_t * src, ip46_address_t * dst)
{
ip_csum_t sum0;
u16 payload_length_host_byte_order;
u32 i;
/* Initialize checksum with ip header. */
sum0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0)) +
clib_host_to_net_u16 (IP_PROTOCOL_TCP);
payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0);
for (i = 0; i < ARRAY_LEN (src->ip6.as_uword); i++)
{
sum0 = ip_csum_with_carry
(sum0, clib_mem_unaligned (&src->ip6.as_uword[i], uword));
sum0 = ip_csum_with_carry
(sum0, clib_mem_unaligned (&dst->ip6.as_uword[i], uword));
}
return ip_calculate_l4_checksum (vm, p0, sum0,
payload_length_host_byte_order, NULL, 0,
NULL);
}
always_inline u16
ip4_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0,
ip46_address_t * src, ip46_address_t * dst)
{
ip_csum_t sum0;
u32 payload_length_host_byte_order;
payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0);
sum0 =
clib_host_to_net_u32 (payload_length_host_byte_order +
(IP_PROTOCOL_TCP << 16));
sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&src->ip4, u32));
sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&dst->ip4, u32));
return ip_calculate_l4_checksum (vm, p0, sum0,
payload_length_host_byte_order, NULL, 0,
NULL);
}
always_inline u16
hicn_hs_compute_checksum (hicn_hs_ctx_t * ctx, vlib_buffer_t * b)
{
u16 checksum = 0;
if (PREDICT_FALSE (ctx->cfg_flags & HICN_HS_CFG_F_NO_CSUM_OFFLOAD))
{
hicn_hs_worker_t *wrk = hicn_hs_get_worker_by_context (ctx);
vlib_main_t *vm = wrk->vm;
ip46_address_t local_ip = {0};
if (ctx->c_is_ip4)
checksum = ip4_tcp_compute_checksum_custom
(vm, b, &local_ip, &ctx->c_rmt_ip);
else
checksum = ip6_tcp_compute_checksum_custom
(vm, b, &local_ip, &ctx->c_rmt_ip);
}
else
{
b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
}
return checksum;
}
#endif /* __HICN_HS_UTILS_H__ */
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