[J-u-boot.git] / drivers / net / sandbox-raw.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2015 National Instruments
 *
 * (C) Copyright 2015
 * Joe Hershberger <[email protected]>
 */

#include <log.h>
#include <asm/eth-raw-os.h>
#include <common.h>
#include <dm.h>
#include <env.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);
	int ret;

	debug("eth_sandbox_raw: Start\n");

	ret = sandbox_eth_raw_os_start(priv, pdata->enetaddr);
	if (priv->local) {
		env_set("ipaddr", "127.0.0.1");
		env_set("serverip", "127.0.0.1");
		net_ip = string_to_ip("127.0.0.1");
		net_server_ip = net_ip;
	}
	return ret;
}

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 int sb_eth_raw_read_rom_hwaddr(struct udevice *dev)
{
	struct eth_pdata *pdata = dev_get_platdata(dev);

	net_random_ethaddr(pdata->enetaddr);

	return 0;
}

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,
	.read_rom_hwaddr	= sb_eth_raw_read_rom_hwaddr,
};

static int sb_eth_raw_ofdata_to_platdata(struct udevice *dev)
{
	struct eth_pdata *pdata = dev_get_platdata(dev);
	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
	const char *ifname;
	int ret;

	pdata->iobase = dev_read_addr(dev);

	ifname = dev_read_string(dev, "host-raw-interface");
	if (ifname) {
		strncpy(priv->host_ifname, ifname, IFNAMSIZ);
		printf(": Using %s from DT\n", priv->host_ifname);
	}
	if (dev_read_u32(dev, "host-raw-interface-idx",
			 &priv->host_ifindex) < 0) {
		priv->host_ifindex = 0;
	} else {
		ret = sandbox_eth_raw_os_idx_to_name(priv);
		if (ret < 0)
			return ret;
		printf(": Using interface index %d from DT (%s)\n",
		       priv->host_ifindex, priv->host_ifname);
	}

	ret = sandbox_eth_raw_os_is_local(priv->host_ifname);
	if (ret < 0)
		return ret;
	priv->local = ret;

	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	= sizeof(struct eth_sandbox_raw_priv),
	.plat_auto	= sizeof(struct eth_pdata),
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0
a346ca79 JH	2	/*
	3	* Copyright (c) 2015 National Instruments
	4	*
	5	* (C) Copyright 2015
	6	* Joe Hershberger <[email protected]>
a346ca79 JH	7	*/
a346ca79 JH	8
f7ae49fc	9	#include <log.h>
a346ca79 JH	10	#include <asm/eth-raw-os.h>
	11	#include <common.h>
	12	#include <dm.h>
9fb625ce	13	#include <env.h>
a346ca79 JH	14	#include <malloc.h>
	15	#include <net.h>
	16
	17	DECLARE_GLOBAL_DATA_PTR;
	18
22f68524	19	static int reply_arp;
049a95a7	20	static struct in_addr arp_ip;
a346ca79 JH	21
	22	static int sb_eth_raw_start(struct udevice *dev)
	23	{
	24	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
	25	struct eth_pdata *pdata = dev_get_platdata(dev);
8c7988b6	26	int ret;
a346ca79 JH	27
	28	debug("eth_sandbox_raw: Start\n");
	29
8c7988b6 JH	30	ret = sandbox_eth_raw_os_start(priv, pdata->enetaddr);
8c7988b6 JH	31	if (priv->local) {
382bee57 SG	32	env_set("ipaddr", "127.0.0.1");
382bee57 SG	33	env_set("serverip", "127.0.0.1");
ac13270b JH	34	net_ip = string_to_ip("127.0.0.1");
ac13270b JH	35	net_server_ip = net_ip;
22f68524	36	}
8c7988b6	37	return ret;
a346ca79 JH	38	}
	39
	40	static int sb_eth_raw_send(struct udevice dev, void packet, int length)
	41	{
	42	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
	43
	44	debug("eth_sandbox_raw: Send packet %d\n", length);
	45
22f68524 JH	46	if (priv->local) {
	47	struct ethernet_hdr *eth = packet;
	48
	49	if (ntohs(eth->et_protlen) == PROT_ARP) {
	50	struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
	51
	52	/**
	53	* localhost works on a higher-level API in Linux than
	54	* ARP packets, so fake it
	55	*/
049a95a7	56	arp_ip = net_read_ip(&arp->ar_tpa);
22f68524 JH	57	reply_arp = 1;
	58	return 0;
	59	}
	60	packet += ETHER_HDR_SIZE;
	61	length -= ETHER_HDR_SIZE;
	62	}
a346ca79 JH	63	return sandbox_eth_raw_os_send(packet, length, priv);
	64	}
	65
a1ca92ea	66	static int sb_eth_raw_recv(struct udevice dev, int flags, uchar *packetp)
a346ca79	67	{
22f68524	68	struct eth_pdata *pdata = dev_get_platdata(dev);
a346ca79	69	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
22f68524	70	int retval = 0;
a346ca79 JH	71	int length;
a346ca79 JH	72
22f68524 JH	73	if (reply_arp) {
	74	struct arp_hdr arp = (void )net_rx_packets[0] +
	75	ETHER_HDR_SIZE;
	76
	77	/*
	78	* Fake an ARP response. The u-boot network stack is sending an
	79	* ARP request (to find the MAC address to address the actual
	80	* packet to) and requires an ARP response to continue. Since
	81	* this is the localhost interface, there is no Etherent level
	82	* traffic at all, so there is no way to send an ARP request or
	83	* to get a response. For this reason we fake the response to
	84	* make the u-boot network stack happy.
	85	*/
	86	arp->ar_hrd = htons(ARP_ETHER);
	87	arp->ar_pro = htons(PROT_IP);
	88	arp->ar_hln = ARP_HLEN;
	89	arp->ar_pln = ARP_PLEN;
	90	arp->ar_op = htons(ARPOP_REPLY);
	91	/* Any non-zero MAC address will work */
	92	memset(&arp->ar_sha, 0x01, ARP_HLEN);
	93	/* Use whatever IP we were looking for (always 127.0.0.1?) */
049a95a7	94	net_write_ip(&arp->ar_spa, arp_ip);
22f68524	95	memcpy(&arp->ar_tha, pdata->enetaddr, ARP_HLEN);
049a95a7	96	net_write_ip(&arp->ar_tpa, net_ip);
22f68524 JH	97	length = ARP_HDR_SIZE;
	98	} else {
	99	/* If local, the Ethernet header won't be included; skip it */
	100	uchar *pktptr = priv->local ?
	101	net_rx_packets[0] + ETHER_HDR_SIZE : net_rx_packets[0];
	102
	103	retval = sandbox_eth_raw_os_recv(pktptr, &length, priv);
	104	}
a346ca79 JH	105
a346ca79 JH	106	if (!retval && length) {
22f68524 JH	107	if (priv->local) {
	108	struct ethernet_hdr eth = (void )net_rx_packets[0];
	109
	110	/* Fill in enough of the missing Ethernet header */
	111	memcpy(eth->et_dest, pdata->enetaddr, ARP_HLEN);
	112	memset(eth->et_src, 0x01, ARP_HLEN);
	113	eth->et_protlen = htons(reply_arp ? PROT_ARP : PROT_IP);
	114	reply_arp = 0;
	115	length += ETHER_HDR_SIZE;
	116	}
	117
a346ca79 JH	118	debug("eth_sandbox_raw: received packet %d\n",
	119	length);
	120	*packetp = net_rx_packets[0];
	121	return length;
	122	}
	123	return retval;
	124	}
	125
	126	static void sb_eth_raw_stop(struct udevice *dev)
	127	{
	128	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
	129
	130	debug("eth_sandbox_raw: Stop\n");
	131
	132	sandbox_eth_raw_os_stop(priv);
	133	}
	134
b96ced9c JH	135	static int sb_eth_raw_read_rom_hwaddr(struct udevice *dev)
	136	{
	137	struct eth_pdata *pdata = dev_get_platdata(dev);
	138
	139	net_random_ethaddr(pdata->enetaddr);
	140
	141	return 0;
	142	}
	143
a346ca79 JH	144	static const struct eth_ops sb_eth_raw_ops = {
	145	.start = sb_eth_raw_start,
	146	.send = sb_eth_raw_send,
	147	.recv = sb_eth_raw_recv,
	148	.stop = sb_eth_raw_stop,
b96ced9c	149	.read_rom_hwaddr = sb_eth_raw_read_rom_hwaddr,
a346ca79 JH	150	};
	151
	152	static int sb_eth_raw_ofdata_to_platdata(struct udevice *dev)
	153	{
	154	struct eth_pdata *pdata = dev_get_platdata(dev);
8c7988b6 JH	155	struct eth_sandbox_raw_priv *priv = dev_get_priv(dev);
8c7988b6 JH	156	const char *ifname;
c9e2caff	157	int ret;
8c7988b6 JH	158
	159	pdata->iobase = dev_read_addr(dev);
	160
	161	ifname = dev_read_string(dev, "host-raw-interface");
	162	if (ifname) {
	163	strncpy(priv->host_ifname, ifname, IFNAMSIZ);
	164	printf(": Using %s from DT\n", priv->host_ifname);
8c7988b6	165	}
c9e2caff JH	166	if (dev_read_u32(dev, "host-raw-interface-idx",
	167	&priv->host_ifindex) < 0) {
	168	priv->host_ifindex = 0;
	169	} else {
	170	ret = sandbox_eth_raw_os_idx_to_name(priv);
	171	if (ret < 0)
	172	return ret;
	173	printf(": Using interface index %d from DT (%s)\n",
	174	priv->host_ifindex, priv->host_ifname);
	175	}
a346ca79	176
8405452e SG	177	ret = sandbox_eth_raw_os_is_local(priv->host_ifname);
	178	if (ret < 0)
	179	return ret;
	180	priv->local = ret;
ac13270b	181
a346ca79 JH	182	return 0;
	183	}
	184
	185	static const struct udevice_id sb_eth_raw_ids[] = {
	186	{ .compatible = "sandbox,eth-raw" },
	187	{ }
	188	};
	189
	190	U_BOOT_DRIVER(eth_sandbox_raw) = {
	191	.name = "eth_sandbox_raw",
	192	.id = UCLASS_ETH,
	193	.of_match = sb_eth_raw_ids,
	194	.ofdata_to_platdata = sb_eth_raw_ofdata_to_platdata,
	195	.ops = &sb_eth_raw_ops,
41575d8e	196	.priv_auto = sizeof(struct eth_sandbox_raw_priv),
caa4daa2	197	.plat_auto = sizeof(struct eth_pdata),
a346ca79	198	};