1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2018 Intel Corporation 3 */ 4 5 #include <arpa/inet.h> 6 7 #include <rte_arp.h> 8 9 #define RARP_PKT_SIZE 64 10 struct rte_mbuf * __rte_experimental 11 rte_net_make_rarp_packet(struct rte_mempool *mpool, 12 const struct ether_addr *mac) 13 { 14 struct ether_hdr *eth_hdr; 15 struct arp_hdr *rarp; 16 struct rte_mbuf *mbuf; 17 18 if (mpool == NULL) 19 return NULL; 20 21 mbuf = rte_pktmbuf_alloc(mpool); 22 if (mbuf == NULL) 23 return NULL; 24 25 eth_hdr = (struct ether_hdr *)rte_pktmbuf_append(mbuf, RARP_PKT_SIZE); 26 if (eth_hdr == NULL) { 27 rte_pktmbuf_free(mbuf); 28 return NULL; 29 } 30 31 /* Ethernet header. */ 32 memset(eth_hdr->d_addr.addr_bytes, 0xff, ETHER_ADDR_LEN); 33 ether_addr_copy(mac, ð_hdr->s_addr); 34 eth_hdr->ether_type = htons(ETHER_TYPE_RARP); 35 36 /* RARP header. */ 37 rarp = (struct arp_hdr *)(eth_hdr + 1); 38 rarp->arp_hrd = htons(ARP_HRD_ETHER); 39 rarp->arp_pro = htons(ETHER_TYPE_IPv4); 40 rarp->arp_hln = ETHER_ADDR_LEN; 41 rarp->arp_pln = 4; 42 rarp->arp_op = htons(ARP_OP_REVREQUEST); 43 44 ether_addr_copy(mac, &rarp->arp_data.arp_sha); 45 ether_addr_copy(mac, &rarp->arp_data.arp_tha); 46 memset(&rarp->arp_data.arp_sip, 0x00, 4); 47 memset(&rarp->arp_data.arp_tip, 0x00, 4); 48 49 return mbuf; 50 } 51