cnet_rarp.h

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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright (c) 2019-2022 Intel Corporation
 */
 
#ifndef _CNE_RARP_H_
#define _CNE_RARP_H_
 
// IWYU pragma: no_forward_declare cne_mempool
 
#include <stdint.h>               // for uint16_t, uint32_t, uint8_t
#include <net/cne_ether.h>        // for ether_addr
#include <net/ethernet.h>         // for ether_addr
 
#include <net/cne_arp.h>
#include <mempool.h>        // for cne_mempool
#include <pktmbuf.h>        // for pktmbuf_info_t, pktmbuf_t
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define RARP_PKT_SIZE 64
static inline pktmbuf_t *
cne_net_make_rarp_packet(pktmbuf_info_t *pi, const struct ether_addr *mac)
{
    struct cne_ether_hdr *eth_hdr;
    struct cne_arp_hdr *rarp;
    pktmbuf_t *mbuf;
 
    if (pi == NULL)
        return NULL;
 
    mbuf = pktmbuf_alloc(pi);
    if (mbuf == NULL)
        return NULL;
 
    eth_hdr = (struct cne_ether_hdr *)pktmbuf_append(mbuf, RARP_PKT_SIZE);
    if (eth_hdr == NULL) {
        pktmbuf_free(mbuf);
        return NULL;
    }
 
    /* Ethernet header. */
    memset(eth_hdr->d_addr.ether_addr_octet, 0xff, ETH_ALEN);
    ether_addr_copy(mac, &eth_hdr->s_addr);
    eth_hdr->ether_type = htons(CNE_ETHER_TYPE_RARP);
 
    /* RARP header. */
    rarp               = (struct cne_arp_hdr *)(eth_hdr + 1);
    rarp->arp_hardware = htons(CNE_ARP_HRD_ETHER);
    rarp->arp_protocol = htons(CNE_ETHER_TYPE_IPV4);
    rarp->arp_hlen     = ETH_ALEN;
    rarp->arp_plen     = 4;
    rarp->arp_opcode   = htons(CNE_ARP_OP_REVREQUEST);
 
    ether_addr_copy(mac, &rarp->arp_data.arp_sha);
    ether_addr_copy(mac, &rarp->arp_data.arp_tha);
    memset(&rarp->arp_data.arp_sip, 0x00, 4);
    memset(&rarp->arp_data.arp_tip, 0x00, 4);
 
    return mbuf;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _CNE_RARP_H_ */