summaryrefslogtreecommitdiffstats
path: root/drivers/net/sandbox.c
blob: e239ff44479d07cbd04d3906c46646bae2f3c9c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/*
 * Copyright (c) 2015 National Instruments
 *
 * (C) Copyright 2015
 * Joe Hershberger <joe.hershberger@ni.com>
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <net.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
 * 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;
	uchar *recv_packet_buffer;
	int recv_packet_length;
};

static bool disabled[8] = {false};

/*
 * 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)
{
	disabled[index] = disable;
}

static int sb_eth_start(struct udevice *dev)
{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);

	debug("eth_sandbox: Start\n");

	fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr",
			      priv->fake_host_hwaddr, ARP_HLEN);
	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 (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) &&
	    disabled[dev->seq])
		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, uchar **packetp)
{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);

	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);

	pdata->iobase = dev_get_addr(dev);
	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),
};
OpenPOWER on IntegriCloud