diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/ipv6_stack/utils/ipv6_utils.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/ipv6_stack/utils/ipv6_utils.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/ipv6_stack/utils/ipv6_utils.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/ipv6_stack/utils/ipv6_utils.c new file mode 100644 index 0000000..8b70cba --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/ipv6_stack/utils/ipv6_utils.c @@ -0,0 +1,101 @@ +/** + * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, must reproduce the above copyright notice, this list of + * conditions and the following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * 3. Neither the name of Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ +#include <stdint.h> +#include <stdbool.h> +#include "nordic_common.h" +#include "sdk_common.h" +#include "sdk_config.h" +#include "ipv6_utils.h" + +void ipv6_checksum_calculate(const uint8_t * p_data, uint16_t len, uint16_t * p_checksum, bool flip_flag) +{ + uint16_t checksum_even = (((*p_checksum) & 0xFF00) >> 8); + uint16_t checksum_odd = ((*p_checksum) & 0x00FF); + + while (len) + { + if ( len == 1 ) + { + checksum_even += (*p_data); + len -= 1; + } + else + { + checksum_even += *p_data++; + checksum_odd += *p_data++; + len -= 2; + } + + if (checksum_odd & 0xFF00) + { + checksum_even += ((checksum_odd & 0xFF00) >> 8); + checksum_odd = (checksum_odd & 0x00FF); + } + + if (checksum_even & 0xFF00) + { + checksum_odd += ((checksum_even & 0xFF00) >> 8); + checksum_even = (checksum_even & 0x00FF); + } + } + + checksum_even = (checksum_even << 8) + (checksum_odd & 0xFFFF); + + if (flip_flag) + { + // We use 0xFFFF instead of 0x0000 because of not operator. + if (checksum_even == 0xFFFF) + { + checksum_even = 0x0000; + } + } + + (*p_checksum) = (uint16_t)(checksum_even); +} + +void ipv6_header_init(ipv6_header_t * p_ip_header) +{ + p_ip_header->version_traffic_class = IPV6_DEFAULT_VER_TC; + p_ip_header->traffic_class_flowlabel = IPV6_DEFAULT_TC_FL; + p_ip_header->flowlabel = IPV6_DEFAULT_FL; + p_ip_header->next_header = IPV6_NEXT_HEADER_RESERVED; + p_ip_header->hoplimit = IPV6_DEFAULT_HOP_LIMIT; + p_ip_header->length = 0; +} |