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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015 National Instruments
*
* (C) Copyright 2015
* Joe Hershberger <joe.hershberger@ni.com>
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <net.h>
#include <asm/test.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* struct eth_sandbox_priv - memory for sandbox mock driver
*
* fake_host_hwaddr: MAC address of mocked machine
* fake_host_ipaddr: IP address of mocked machine
* disabled: Will not respond
* recv_packet_buffer: buffer of the packet returned as received
* recv_packet_length: length of the packet returned as received
*/
struct eth_sandbox_priv {
uchar fake_host_hwaddr[ARP_HLEN];
struct in_addr fake_host_ipaddr;
bool disabled;
uchar *recv_packet_buffer;
int recv_packet_length;
};
static bool skip_timeout;
/*
* sandbox_eth_disable_response()
*
* index - The alias index (also DM seq number)
* disable - If non-zero, ignore sent packets and don't send mock response
*/
void sandbox_eth_disable_response(int index, bool disable)
{
struct udevice *dev;
struct eth_sandbox_priv *priv;
int ret;
ret = uclass_get_device(UCLASS_ETH, index, &dev);
if (ret)
return;
priv = dev_get_priv(dev);
priv->disabled = disable;
}
/*
* sandbox_eth_skip_timeout()
*
* When the first packet read is attempted, fast-forward time
*/
void sandbox_eth_skip_timeout(void)
{
skip_timeout = true;
}
static int sb_eth_start(struct udevice *dev)
{
struct eth_sandbox_priv *priv = dev_get_priv(dev);
debug("eth_sandbox: Start\n");
priv->recv_packet_buffer = net_rx_packets[0];
return 0;
}
static int sb_eth_send(struct udevice *dev, void *packet, int length)
{
struct eth_sandbox_priv *priv = dev_get_priv(dev);
struct ethernet_hdr *eth = packet;
debug("eth_sandbox: Send packet %d\n", length);
if (priv->disabled)
return 0;
if (ntohs(eth->et_protlen) == PROT_ARP) {
struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
struct ethernet_hdr *eth_recv;
struct arp_hdr *arp_recv;
/* store this as the assumed IP of the fake host */
priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa);
/* Formulate a fake response */
eth_recv = (void *)priv->recv_packet_buffer;
memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
ARP_HLEN);
eth_recv->et_protlen = htons(PROT_ARP);
arp_recv = (void *)priv->recv_packet_buffer +
ETHER_HDR_SIZE;
arp_recv->ar_hrd = htons(ARP_ETHER);
arp_recv->ar_pro = htons(PROT_IP);
arp_recv->ar_hln = ARP_HLEN;
arp_recv->ar_pln = ARP_PLEN;
arp_recv->ar_op = htons(ARPOP_REPLY);
memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
ARP_HLEN);
net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr);
memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa);
priv->recv_packet_length = ETHER_HDR_SIZE +
ARP_HDR_SIZE;
}
} else if (ntohs(eth->et_protlen) == PROT_IP) {
struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;
if (ip->ip_p == IPPROTO_ICMP) {
struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;
if (icmp->type == ICMP_ECHO_REQUEST) {
struct ethernet_hdr *eth_recv;
struct ip_udp_hdr *ipr;
struct icmp_hdr *icmpr;
/* reply to the ping */
memcpy(priv->recv_packet_buffer, packet,
length);
eth_recv = (void *)priv->recv_packet_buffer;
ipr = (void *)priv->recv_packet_buffer +
ETHER_HDR_SIZE;
icmpr = (struct icmp_hdr *)&ipr->udp_src;
memcpy(eth_recv->et_dest, eth->et_src,
ARP_HLEN);
memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
ARP_HLEN);
ipr->ip_sum = 0;
ipr->ip_off = 0;
net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src);
net_write_ip((void *)&ipr->ip_src,
priv->fake_host_ipaddr);
ipr->ip_sum = compute_ip_checksum(ipr,
IP_HDR_SIZE);
icmpr->type = ICMP_ECHO_REPLY;
icmpr->checksum = 0;
icmpr->checksum = compute_ip_checksum(icmpr,
ICMP_HDR_SIZE);
priv->recv_packet_length = length;
}
}
}
return 0;
}
static int sb_eth_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct eth_sandbox_priv *priv = dev_get_priv(dev);
if (skip_timeout) {
sandbox_timer_add_offset(11000UL);
skip_timeout = false;
}
if (priv->recv_packet_length) {
int lcl_recv_packet_length = priv->recv_packet_length;
debug("eth_sandbox: received packet %d\n",
priv->recv_packet_length);
priv->recv_packet_length = 0;
*packetp = priv->recv_packet_buffer;
return lcl_recv_packet_length;
}
return 0;
}
static void sb_eth_stop(struct udevice *dev)
{
debug("eth_sandbox: Stop\n");
}
static int sb_eth_write_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_platdata(dev);
debug("eth_sandbox %s: Write HW ADDR - %pM\n", dev->name,
pdata->enetaddr);
return 0;
}
static const struct eth_ops sb_eth_ops = {
.start = sb_eth_start,
.send = sb_eth_send,
.recv = sb_eth_recv,
.stop = sb_eth_stop,
.write_hwaddr = sb_eth_write_hwaddr,
};
static int sb_eth_remove(struct udevice *dev)
{
return 0;
}
static int sb_eth_ofdata_to_platdata(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_platdata(dev);
struct eth_sandbox_priv *priv = dev_get_priv(dev);
const u8 *mac;
pdata->iobase = dev_read_addr(dev);
mac = dev_read_u8_array_ptr(dev, "fake-host-hwaddr", ARP_HLEN);
if (!mac) {
printf("'fake-host-hwaddr' is missing from the DT\n");
return -EINVAL;
}
memcpy(priv->fake_host_hwaddr, mac, ARP_HLEN);
priv->disabled = false;
return 0;
}
static const struct udevice_id sb_eth_ids[] = {
{ .compatible = "sandbox,eth" },
{ }
};
U_BOOT_DRIVER(eth_sandbox) = {
.name = "eth_sandbox",
.id = UCLASS_ETH,
.of_match = sb_eth_ids,
.ofdata_to_platdata = sb_eth_ofdata_to_platdata,
.remove = sb_eth_remove,
.ops = &sb_eth_ops,
.priv_auto_alloc_size = sizeof(struct eth_sandbox_priv),
.platdata_auto_alloc_size = sizeof(struct eth_pdata),
};
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