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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#ifndef _ARP_H_
#define _ARP_H_
#include <rte_ether.h>
#include "prox_compat.h"
#include "etypes.h"
#include "mbuf_utils.h"
#define ARP_REQUEST 0x100
#define ARP_REPLY 0x200
struct _arp_ipv4 {
prox_rte_ether_addr sha; /* Sender hardware address */
uint32_t spa; /* Sender protocol address */
prox_rte_ether_addr tha; /* Target hardware address */
uint32_t tpa; /* Target protocol address */
} __attribute__((__packed__)) __attribute__((__aligned__(2)));
typedef struct _arp_ipv4 arp_ipv4_t;
struct my_arp_t {
uint16_t htype;
uint16_t ptype;
uint8_t hlen;
uint8_t plen;
uint16_t oper;
arp_ipv4_t data;
} __attribute__((__packed__)) __attribute__((__aligned__(2)));
struct ether_hdr_arp {
prox_rte_ether_hdr ether_hdr;
struct my_arp_t arp;
};
static int arp_is_gratuitous(struct my_arp_t *arp)
{
return arp->data.spa == arp->data.tpa;
}
// This build an arp reply based on a an request
static inline void build_arp_reply(prox_rte_ether_hdr *ether_hdr, prox_rte_ether_addr *s_addr, struct my_arp_t *arp)
{
uint32_t ip_source = arp->data.spa;
memcpy(ether_hdr->d_addr.addr_bytes, ether_hdr->s_addr.addr_bytes, sizeof(prox_rte_ether_addr));
memcpy(ether_hdr->s_addr.addr_bytes, s_addr, sizeof(prox_rte_ether_addr));
arp->data.spa = arp->data.tpa;
arp->data.tpa = ip_source;
arp->oper = 0x200;
memcpy(&arp->data.tha, &arp->data.sha, sizeof(prox_rte_ether_addr));
memcpy(&arp->data.sha, s_addr, sizeof(prox_rte_ether_addr));
}
static inline void build_arp_request(struct rte_mbuf *mbuf, prox_rte_ether_addr *src_mac, uint32_t ip_dst, uint32_t ip_src, uint16_t vlan)
{
struct ether_hdr_arp *hdr_arp;
prox_rte_vlan_hdr *vlan_hdr;
prox_rte_ether_hdr *ether_hdr;
struct my_arp_t *arp;
uint64_t mac_bcast = 0xFFFFFFFFFFFF;
init_mbuf_seg(mbuf);
if (vlan) {
ether_hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
vlan_hdr = (prox_rte_vlan_hdr *)(ether_hdr + 1);
arp = (struct my_arp_t *)(vlan_hdr + 1);
ether_hdr->ether_type = ETYPE_VLAN;
vlan_hdr->eth_proto = ETYPE_ARP;
vlan_hdr->vlan_tci = rte_cpu_to_be_16(vlan);
rte_pktmbuf_pkt_len(mbuf) = 42 + sizeof(prox_rte_vlan_hdr);
rte_pktmbuf_data_len(mbuf) = 42 + sizeof(prox_rte_vlan_hdr);
} else {
ether_hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *);
arp = (struct my_arp_t *)(ether_hdr + 1);
ether_hdr->ether_type = ETYPE_ARP;
rte_pktmbuf_pkt_len(mbuf) = 42;
rte_pktmbuf_data_len(mbuf) = 42;
}
memcpy(ðer_hdr->d_addr.addr_bytes, &mac_bcast, 6);
memcpy(ðer_hdr->s_addr.addr_bytes, src_mac, 6);
arp->htype = 0x100,
arp->ptype = 0x0008;
arp->hlen = 6;
arp->plen = 4;
arp->oper = 0x100;
arp->data.spa = ip_src;
arp->data.tpa = ip_dst;
memset(&arp->data.tha, 0, sizeof(prox_rte_ether_addr));
memcpy(&arp->data.sha, src_mac, sizeof(prox_rte_ether_addr));
}
static void create_mac(struct my_arp_t *arp, prox_rte_ether_addr *addr)
{
addr->addr_bytes[0] = 0x2;
addr->addr_bytes[1] = 0;
// Instead of sending a completely random MAC address, create the following MAC:
// 02:00:x1:x2:x3:x4 where x1:x2:x3:x4 is the IP address
memcpy(addr->addr_bytes + 2, (uint32_t *)&arp->data.tpa, 4);
}
#endif /* _ARP_H_ */
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