summaryrefslogtreecommitdiff
path: root/drivers/net/netconsole.c
blob: 3d0d45d62e872cecbf0d726ba256d83a769f82c9 (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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 * (C) Copyright 2004
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <stdio_dev.h>
#include <net.h>

DECLARE_GLOBAL_DATA_PTR;

#ifndef CONFIG_NETCONSOLE_BUFFER_SIZE
#define CONFIG_NETCONSOLE_BUFFER_SIZE 512
#endif

extern unsigned dhcpserver;

static char input_buffer[CONFIG_NETCONSOLE_BUFFER_SIZE];
static int input_size; /* char count in input buffer */
static int input_offset; /* offset to valid chars in input buffer */
int input_recursion;
static int output_recursion;
static int net_timeout;
static uchar nc_ether[6]; /* server enet address */
static IPaddr_t nc_ip; /* server ip */
static short nc_out_port; /* target output port */
static short nc_in_port; /* source input port */
static const char *output_packet; /* used by first send udp */
static int output_packet_len;
/*
 * Start with a default last protocol.
 * We are only interested in NETCONS or not.
 */
enum proto_t net_loop_last_protocol = BOOTP;

static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
				 IPaddr_t sip, unsigned src,
				 unsigned len)
{
	net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
}

static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
			unsigned len)
{
	if (input_size)
		net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
}

static void nc_timeout(void)
{
	net_set_state(NETLOOP_SUCCESS);
}

static int is_broadcast(IPaddr_t ip)
{
	static IPaddr_t netmask;
	static IPaddr_t our_ip;
	static int env_changed_id;
	int env_id = get_env_id();

	/* update only when the environment has changed */
	if (env_changed_id != env_id) {
		netmask = getenv_IPaddr("netmask");
		our_ip = getenv_IPaddr("ipaddr");

		env_changed_id = env_id;
	}

	return (ip == ~0 ||				/* 255.255.255.255 */
	    ((netmask & our_ip) == (netmask & ip) &&	/* on the same net */
	    (netmask | ip) == ~0));		/* broadcast to our net */
}

static int refresh_settings_from_env(void)
{
	const char *p;
	static int env_changed_id;
	int env_id = get_env_id();

	/* update only when the environment has changed */
	if (env_changed_id != env_id) {
		if (getenv("ncip")) {
			nc_ip = getenv_IPaddr("ncip");
			if (!nc_ip)
				return -1;	/* ncip is 0.0.0.0 */
			p = strchr(getenv("ncip"), ':');
			if (p != NULL) {
				nc_out_port = simple_strtoul(p + 1, NULL, 10);
				nc_in_port = nc_out_port;
			}
		} else
			nc_ip = ~0; /* ncip is not set, so broadcast */

		p = getenv("ncoutport");
		if (p != NULL)
			nc_out_port = simple_strtoul(p, NULL, 10);
		p = getenv("ncinport");
		if (p != NULL)
			nc_in_port = simple_strtoul(p, NULL, 10);

		if (is_broadcast(nc_ip))
			/* broadcast MAC address */
			memset(nc_ether, 0xff, sizeof(nc_ether));
		else {
			debug("%s dhcpserver: %d\n", __func__, dhcpserver);
			if (dhcpserver) {
				eth_parse_enetaddr(nc_ether, CONFIG_USBNET_HOST_ADDR);
			}
			else {
				/* force arp request */
				memset(nc_ether, 0, sizeof(nc_ether));
			}
		}
	}
	return 0;
}

/**
 * Called from NetLoop in net/net.c before each packet
 */
void NcStart(void)
{
	refresh_settings_from_env();
	if (!output_packet_len || memcmp(nc_ether, NetEtherNullAddr, 6)) {
		/* going to check for input packet */
		net_set_udp_handler(nc_handler);
		NetSetTimeout(net_timeout, nc_timeout);
	} else {
		/* send arp request */
		uchar *pkt;
		net_set_arp_handler(nc_wait_arp_handler);
		pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
		memcpy(pkt, output_packet, output_packet_len);
		NetSendUDPPacket(nc_ether, nc_ip, nc_out_port, nc_in_port,
			output_packet_len);
	}
}

int nc_input_packet(uchar *pkt, IPaddr_t src_ip, unsigned dest_port,
	unsigned src_port, unsigned len)
{
	int end, chunk;

	if (dest_port != nc_in_port || !len)
		return 0; /* not for us */

	if (src_ip != nc_ip && !is_broadcast(nc_ip))
		return 0; /* not from our client */

	debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);

	if (input_size == sizeof(input_buffer))
		return 1; /* no space */
	if (len > sizeof(input_buffer) - input_size)
		len = sizeof(input_buffer) - input_size;

	end = input_offset + input_size;
	if (end > sizeof(input_buffer))
		end -= sizeof(input_buffer);

	chunk = len;
	if (end + len > sizeof(input_buffer)) {
		chunk = sizeof(input_buffer) - end;
		memcpy(input_buffer, pkt + chunk, len - chunk);
	}
	memcpy(input_buffer + end, pkt, chunk);

	input_size += len;

	return 1;
}

static void nc_send_packet(const char *buf, int len)
{
	struct eth_device *eth;
	int inited = 0;
	uchar *pkt;
	uchar *ether;
	IPaddr_t ip;

	debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);

	eth = eth_get_dev();
	if (eth == NULL)
		return;

	if (!memcmp(nc_ether, NetEtherNullAddr, 6)) {
		if (eth->state == ETH_STATE_ACTIVE)
			return;	/* inside net loop */
		output_packet = buf;
		output_packet_len = len;
		input_recursion = 1;
		NetLoop(NETCONS); /* wait for arp reply and send packet */
		input_recursion = 0;
		output_packet_len = 0;
		return;
	}

	if (eth->state != ETH_STATE_ACTIVE) {
		if (eth_is_on_demand_init()) {
			if (eth_init(gd->bd) < 0)
				return;
			eth_set_last_protocol(NETCONS);
		} else
			eth_init_state_only(gd->bd);

		inited = 1;
	}
	pkt = (uchar *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
	memcpy(pkt, buf, len);
	ether = nc_ether;
	ip = nc_ip;
	NetSendUDPPacket(ether, ip, nc_out_port, nc_in_port, len);

	if (inited) {
		if (eth_is_on_demand_init())
			eth_halt();
		else
			eth_halt_state_only();
	}
}

static int nc_start(void)
{
	int retval;

	nc_out_port = 6666; /* default port */
	nc_in_port = nc_out_port;

	retval = refresh_settings_from_env();
	if (retval != 0)
		return retval;

	/*
	 * Initialize the static IP settings and buffer pointers
	 * incase we call NetSendUDPPacket before NetLoop
	 */
	net_init();

	return 0;
}

static void nc_putc(char c)
{
	if (output_recursion)
		return;
	output_recursion = 1;

	nc_send_packet(&c, 1);

	output_recursion = 0;
}

static void nc_puts(const char *s)
{
	int len;

	if (output_recursion)
		return;
	output_recursion = 1;

	len = strlen(s);
	while (len) {
		int send_len = min(len, sizeof(input_buffer));
		nc_send_packet(s, send_len);
		len -= send_len;
		s += send_len;
	}

	output_recursion = 0;
}

static int nc_getc(void)
{
	uchar c;

	input_recursion = 1;

	net_timeout = 0;	/* no timeout */
	while (!input_size)
		NetLoop(NETCONS);

	input_recursion = 0;

	c = input_buffer[input_offset++];

	if (input_offset >= sizeof(input_buffer))
		input_offset -= sizeof(input_buffer);
	input_size--;

	return c;
}

static int nc_tstc(void)
{
	struct eth_device *eth;

	if (input_recursion)
		return 0;

	if (input_size)
		return 1;

	eth = eth_get_dev();
	if (eth && eth->state == ETH_STATE_ACTIVE)
		return 0;	/* inside net loop */

	input_recursion = 1;

	net_timeout = 1;
	NetLoop(NETCONS);	/* kind of poll */

	input_recursion = 0;

	return input_size != 0;
}

int drv_nc_init(void)
{
	struct stdio_dev dev;
	int rc;

	memset(&dev, 0, sizeof(dev));

	strcpy(dev.name, "nc");
	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
	dev.start = nc_start;
	dev.putc = nc_putc;
	dev.puts = nc_puts;
	dev.getc = nc_getc;
	dev.tstc = nc_tstc;

	rc = stdio_register(&dev);

	return (rc == 0) ? 1 : rc;
}

/* Deregister nc - helpful when its thru USB */
int usb_nc_deregister(void)
{
#ifdef CONFIG_USB_ETHER
	struct eth_device *ethd;

	ethd = eth_get_dev();
	debug("Calling usb_eth_halt\n");
	usb_eth_halt(ethd);
#endif

#ifdef CONFIG_SYS_STDIO_DEREGISTER
        return stdio_deregister("nc");
#else
        return 1;
#endif
}