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/*
* netsniff-ng - the packet sniffing beast
* Subject to the GPL, version 2.
*/
#include <net/if_arp.h>
#include <linux/if_ether.h>
#include "die.h"
#include "built_in.h"
#include "trafgen_l2.h"
#include "trafgen_proto.h"
static struct proto_field eth_fields[] = {
{ .id = ETH_DST_ADDR, .len = 6, },
{ .id = ETH_SRC_ADDR, .len = 6, .offset = 6 },
{ .id = ETH_TYPE, .len = 2, .offset = 12 },
};
static void eth_set_next_proto(struct proto_hdr *hdr, enum proto_id pid)
{
uint16_t eth_type;
switch(pid) {
case PROTO_ARP:
eth_type = ETH_P_ARP;
break;
case PROTO_IP4:
eth_type = ETH_P_IP;
break;
case PROTO_IP6:
eth_type = ETH_P_IPV6;
break;
default:
panic("eth: Not supported protocol id %u\n", pid);
}
proto_field_set_default_be16(hdr, ETH_TYPE, eth_type);
}
static void eth_header_init(struct proto_hdr *hdr)
{
proto_header_fields_add(hdr, eth_fields, array_size(eth_fields));
proto_field_set_default_dev_mac(hdr, ETH_SRC_ADDR);
}
static struct proto_hdr eth_hdr = {
.id = PROTO_ETH,
.layer = PROTO_L2,
.header_init = eth_header_init,
.set_next_proto = eth_set_next_proto,
};
static struct proto_field arp_fields[] = {
{ .id = ARP_HTYPE, .len = 2 },
{ .id = ARP_PTYPE, .len = 2, .offset = 2 },
{ .id = ARP_HLEN, .len = 1, .offset = 4 },
{ .id = ARP_PLEN, .len = 1, .offset = 5 },
{ .id = ARP_OPER, .len = 2, .offset = 6 },
{ .id = ARP_SHA, .len = 6, .offset = 8 },
{ .id = ARP_SPA, .len = 4, .offset = 14 },
{ .id = ARP_THA, .len = 6, .offset = 18 },
{ .id = ARP_TPA, .len = 4, .offset = 24 },
};
static void arp_header_init(struct proto_hdr *hdr)
{
struct proto_hdr *lower;
lower = proto_lower_default_add(hdr, PROTO_ETH);
if (lower->id == PROTO_ETH) {
uint8_t bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
proto_field_set_default_bytes(lower, ETH_DST_ADDR, bcast);
}
proto_header_fields_add(hdr, arp_fields, array_size(arp_fields));
/* Generate Announce request by default */
proto_field_set_default_be16(hdr, ARP_HTYPE, ARPHRD_ETHER);
proto_field_set_default_be16(hdr, ARP_PTYPE, ETH_P_IP);
proto_field_set_default_u8(hdr, ARP_HLEN, 6);
proto_field_set_default_u8(hdr, ARP_PLEN, 4);
proto_field_set_default_be16(hdr, ARP_OPER, ARPOP_REQUEST);
proto_field_set_default_dev_mac(hdr, ARP_SHA);
proto_field_set_default_dev_ipv4(hdr, ARP_SPA);
proto_field_set_default_dev_ipv4(hdr, ARP_TPA);
}
static struct proto_hdr arp_hdr = {
.id = PROTO_ARP,
.layer = PROTO_L2,
.header_init = arp_header_init,
};
void protos_l2_init(void)
{
proto_header_register(ð_hdr);
proto_header_register(&arp_hdr);
}
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