sandbox-raw.c
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/*
* Copyright (c) 2015 National Instruments
*
* (C) Copyright 2015
* Joe Hershberger <joe.hershberger@ni.com>
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <asm/eth-raw-os.h>
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <net.h>
DECLARE_GLOBAL_DATA_PTR;
static int reply_arp;
static struct in_addr arp_ip;
static int sb_eth_raw_start(struct udevice *dev)
{
struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
struct eth_pdata *pdata = dev_get_platdata(dev);
const char *interface;
debug("eth_sandbox_raw: Start\n");
interface = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
"host-raw-interface", NULL);
if (interface == NULL)
return -EINVAL;
if (strcmp(interface, "lo") == 0) {
priv->local = 1;
env_set("ipaddr", "127.0.0.1");
env_set("serverip", "127.0.0.1");
}
return sandbox_eth_raw_os_start(interface, pdata->enetaddr, priv);
}
static int sb_eth_raw_send(struct udevice *dev, void *packet, int length)
{
struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
debug("eth_sandbox_raw: Send packet %d\n", length);
if (priv->local) {
struct ethernet_hdr *eth = packet;
if (ntohs(eth->et_protlen) == PROT_ARP) {
struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
/**
* localhost works on a higher-level API in Linux than
* ARP packets, so fake it
*/
arp_ip = net_read_ip(&arp->ar_tpa);
reply_arp = 1;
return 0;
}
packet += ETHER_HDR_SIZE;
length -= ETHER_HDR_SIZE;
}
return sandbox_eth_raw_os_send(packet, length, priv);
}
static int sb_eth_raw_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct eth_pdata *pdata = dev_get_platdata(dev);
struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
int retval = 0;
int length;
if (reply_arp) {
struct arp_hdr *arp = (void *)net_rx_packets[0] +
ETHER_HDR_SIZE;
/*
* Fake an ARP response. The u-boot network stack is sending an
* ARP request (to find the MAC address to address the actual
* packet to) and requires an ARP response to continue. Since
* this is the localhost interface, there is no Etherent level
* traffic at all, so there is no way to send an ARP request or
* to get a response. For this reason we fake the response to
* make the u-boot network stack happy.
*/
arp->ar_hrd = htons(ARP_ETHER);
arp->ar_pro = htons(PROT_IP);
arp->ar_hln = ARP_HLEN;
arp->ar_pln = ARP_PLEN;
arp->ar_op = htons(ARPOP_REPLY);
/* Any non-zero MAC address will work */
memset(&arp->ar_sha, 0x01, ARP_HLEN);
/* Use whatever IP we were looking for (always 127.0.0.1?) */
net_write_ip(&arp->ar_spa, arp_ip);
memcpy(&arp->ar_tha, pdata->enetaddr, ARP_HLEN);
net_write_ip(&arp->ar_tpa, net_ip);
length = ARP_HDR_SIZE;
} else {
/* If local, the Ethernet header won't be included; skip it */
uchar *pktptr = priv->local ?
net_rx_packets[0] + ETHER_HDR_SIZE : net_rx_packets[0];
retval = sandbox_eth_raw_os_recv(pktptr, &length, priv);
}
if (!retval && length) {
if (priv->local) {
struct ethernet_hdr *eth = (void *)net_rx_packets[0];
/* Fill in enough of the missing Ethernet header */
memcpy(eth->et_dest, pdata->enetaddr, ARP_HLEN);
memset(eth->et_src, 0x01, ARP_HLEN);
eth->et_protlen = htons(reply_arp ? PROT_ARP : PROT_IP);
reply_arp = 0;
length += ETHER_HDR_SIZE;
}
debug("eth_sandbox_raw: received packet %d\n",
length);
*packetp = net_rx_packets[0];
return length;
}
return retval;
}
static void sb_eth_raw_stop(struct udevice *dev)
{
struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
debug("eth_sandbox_raw: Stop\n");
sandbox_eth_raw_os_stop(priv);
}
static const struct eth_ops sb_eth_raw_ops = {
.start = sb_eth_raw_start,
.send = sb_eth_raw_send,
.recv = sb_eth_raw_recv,
.stop = sb_eth_raw_stop,
};
static int sb_eth_raw_ofdata_to_platdata(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_platdata(dev);
pdata->iobase = devfdt_get_addr(dev);
return 0;
}
static const struct udevice_id sb_eth_raw_ids[] = {
{ .compatible = "sandbox,eth-raw" },
{ }
};
U_BOOT_DRIVER(eth_sandbox_raw) = {
.name = "eth_sandbox_raw",
.id = UCLASS_ETH,
.of_match = sb_eth_raw_ids,
.ofdata_to_platdata = sb_eth_raw_ofdata_to_platdata,
.ops = &sb_eth_raw_ops,
.priv_auto_alloc_size = sizeof(struct eth_sandbox_raw_priv),
.platdata_auto_alloc_size = sizeof(struct eth_pdata),
};