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/* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @file
*
* ODP UDP header
*/
#ifndef ODPH_UDP_H_
#define ODPH_UDP_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <odp/align.h>
#include <odp/debug.h>
#include <odp/byteorder.h>
/** UDP header length */
#define ODPH_UDPHDR_LEN 8
/** UDP header */
typedef struct ODP_PACKED {
uint16be_t src_port; /**< Source port */
uint16be_t dst_port; /**< Destination port */
uint16be_t length; /**< UDP datagram length in bytes (header+data) */
uint16be_t chksum; /**< UDP header and data checksum (0 if not used)*/
} odph_udphdr_t;
/** UDP pseudo header */
typedef struct ODPH_PACKET {
uint32be_t src_addr; /**< Source addr */
uint32be_t dst_addr; /**< Destination addr */
uint8_t pad; /**< pad byte */
uint8_t proto; /**< UDP protocol */
uint16be_t length; /**< data length */
} odph_udpphdr_t;
/**
* UDP checksum
*
* This function uses odp packet to calc checksum
*
* @param pkt calculate chksum for pkt
* @return checksum value
*/
static inline uint16_t odph_ipv4_udp_chksum(odp_packet_t pkt)
{
uint32_t sum = 0;
odph_udpphdr_t phdr;
odph_udphdr_t *udph;
odph_ipv4hdr_t *iph;
uint16_t udplen;
if (!odp_packet_l3_offset(pkt))
return 0;
if (!odp_packet_l4_offset(pkt))
return 0;
iph = (odph_ipv4hdr_t *)odp_packet_l3_ptr(pkt, NULL);
udph = (odph_udphdr_t *)odp_packet_l4_ptr(pkt, NULL);
udplen = odp_be_to_cpu_16(udph->length);
/* the source ip */
phdr.src_addr = iph->src_addr;
/* the dest ip */
phdr.dst_addr = iph->dst_addr;
/* proto */
phdr.pad = 0;
phdr.proto = ODPH_IPPROTO_UDP;
/* the length */
phdr.length = udph->length;
/* calc UDP pseudo header chksum */
sum = (__odp_force uint32_t) odp_chksum(&phdr, sizeof(odph_udpphdr_t));
/* calc udp header and data chksum */
sum += (__odp_force uint32_t) odp_chksum(udph, udplen);
/* Fold sum to 16 bits: add carrier to result */
while (sum >> 16)
sum = (sum & 0xFFFF) + (sum >> 16);
/* set computation result */
sum = (sum == 0x0) ? 0xFFFF : sum;
return sum;
}
/** @internal Compile time assert */
_ODP_STATIC_ASSERT(sizeof(odph_udphdr_t) == ODPH_UDPHDR_LEN, "ODPH_UDPHDR_T__SIZE_ERROR");
#ifdef __cplusplus
}
#endif
#endif
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