dao_net.h

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/* SPDX-License-Identifier: Marvell-MIT
 * Copyright (c) 2023 Marvell.
 */
 
#ifndef __DAO_NET_H__
#define __DAO_NET_H__
 
#include <rte_ethdev.h>
 
typedef struct {
    rte_be16_t hi, lo;
} dao_16aligned_be32;
 
/* union used for byte conversion */
union dao_16aligned_in6_addr {
    rte_be16_t be16[8];
    dao_16aligned_be32 be32[4];
};
 
static inline rte_be32_t
dao_get_16aligned_be32(const dao_16aligned_be32 *x)
{
#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
    return ((rte_be32_t)x->hi << 16) | x->lo;
#else
    return ((rte_be32_t)x->lo << 16) | x->hi;
#endif
}
 
static inline struct in6_addr
dao_in6_addr_mapped_ipv4(rte_be32_t ip4)
{
    struct in6_addr ip6;
 
    memset(&ip6, 0, sizeof(ip6));
    ip6.s6_addr[10] = 0xff;
    ip6.s6_addr[11] = 0xff;
    memcpy(&ip6.s6_addr[12], &ip4, 4);
    return ip6;
}
 
static inline void
dao_in6_addr_set_mapped_ipv4(struct in6_addr *ip6, rte_be32_t ip4)
{
    *ip6 = dao_in6_addr_mapped_ipv4(ip4);
}
 
static inline rte_be32_t
dao_in6_addr_get_mapped_ipv4(struct in6_addr *addr)
{
    union dao_16aligned_in6_addr *taddr =
        (union dao_16aligned_in6_addr *)addr;
 
    if (IN6_IS_ADDR_V4MAPPED(taddr))
        return dao_get_16aligned_be32(&taddr->be32[3]);
    else
        return INADDR_ANY;
}
 
#endif /* __DAO_NET_H__ */