summaryrefslogtreecommitdiff
path: root/net/wget.c
blob: 3826c4b3644731e95144d540ccca503f8662bb6a (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
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
// SPDX-License-Identifier: GPL-2.0
/*
 * WGET/HTTP support driver based on U-BOOT's nfs.c
 * Copyright Duncan Hare <dh@synoia.com> 2017
 */

#include <command.h>
#include <common.h>
#include <env.h>
#include <image.h>
#include <mapmem.h>
#include <net.h>
#include <net/tcp.h>
#include <net/wget.h>

static const char bootfile1[] = "GET ";
static const char bootfile3[] = " HTTP/1.0\r\n\r\n";
static const char http_eom[] = "\r\n\r\n";
static const char http_ok[] = "200";
static const char content_len[] = "Content-Length";
static const char linefeed[] = "\r\n";
static struct in_addr web_server_ip;
static int our_port;
static int wget_timeout_count;

struct pkt_qd {
	uchar *pkt;
	unsigned int tcp_seq_num;
	unsigned int len;
};

/*
 * This is a control structure for out of order packets received.
 * The actual packet bufers are in the kernel space, and are
 * expected to be overwritten by the downloaded image.
 */
static struct pkt_qd pkt_q[PKTBUFSRX / 4];
static int pkt_q_idx;
static unsigned long content_length;
static unsigned int packets;

static unsigned int initial_data_seq_num;

static enum  wget_state current_wget_state;

static char *image_url;
static unsigned int wget_timeout = WGET_TIMEOUT;

static enum net_loop_state wget_loop_state;

/* Timeout retry parameters */
static u8 retry_action;			/* actions for TCP retry */
static unsigned int retry_tcp_ack_num;	/* TCP retry acknowledge number*/
static unsigned int retry_tcp_seq_num;	/* TCP retry sequence number */
static int retry_len;			/* TCP retry length */

/**
 * store_block() - store block in memory
 * @src: source of data
 * @offset: offset
 * @len: length
 */
static inline int store_block(uchar *src, unsigned int offset, unsigned int len)
{
	ulong newsize = offset + len;
	uchar *ptr;

	ptr = map_sysmem(image_load_addr + offset, len);
	memcpy(ptr, src, len);
	unmap_sysmem(ptr);

	if (net_boot_file_size < (offset + len))
		net_boot_file_size = newsize;

	return 0;
}

/**
 * wget_send_stored() - wget response dispatcher
 *
 * WARNING, This, and only this, is the place in wget.c where
 * SEQUENCE NUMBERS are swapped between incoming (RX)
 * and outgoing (TX).
 * Procedure wget_handler() is correct for RX traffic.
 */
static void wget_send_stored(void)
{
	u8 action = retry_action;
	int len = retry_len;
	unsigned int tcp_ack_num = retry_tcp_ack_num + len;
	unsigned int tcp_seq_num = retry_tcp_seq_num;
	uchar *ptr, *offset;

	switch (current_wget_state) {
	case WGET_CLOSED:
		debug_cond(DEBUG_WGET, "wget: send SYN\n");
		current_wget_state = WGET_CONNECTING;
		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
				    tcp_seq_num, tcp_ack_num);
		packets = 0;
		break;
	case WGET_CONNECTING:
		pkt_q_idx = 0;
		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
				    tcp_seq_num, tcp_ack_num);

		ptr = net_tx_packet + net_eth_hdr_size() +
			IP_TCP_HDR_SIZE + TCP_TSOPT_SIZE + 2;
		offset = ptr;

		memcpy(offset, &bootfile1, strlen(bootfile1));
		offset += strlen(bootfile1);

		memcpy(offset, image_url, strlen(image_url));
		offset += strlen(image_url);

		memcpy(offset, &bootfile3, strlen(bootfile3));
		offset += strlen(bootfile3);
		net_send_tcp_packet((offset - ptr), SERVER_PORT, our_port,
				    TCP_PUSH, tcp_seq_num, tcp_ack_num);
		current_wget_state = WGET_CONNECTED;
		break;
	case WGET_CONNECTED:
	case WGET_TRANSFERRING:
	case WGET_TRANSFERRED:
		net_send_tcp_packet(0, SERVER_PORT, our_port, action,
				    tcp_seq_num, tcp_ack_num);
		break;
	}
}

static void wget_send(u8 action, unsigned int tcp_ack_num,
		      unsigned int tcp_seq_num, int len)
{
	retry_action = action;
	retry_tcp_ack_num = tcp_ack_num;
	retry_tcp_seq_num = tcp_seq_num;
	retry_len = len;

	wget_send_stored();
}

void wget_fail(char *error_message, unsigned int tcp_seq_num,
	       unsigned int tcp_ack_num, u8 action)
{
	printf("wget: Transfer Fail - %s\n", error_message);
	net_set_timeout_handler(0, NULL);
	wget_send(action, tcp_seq_num, tcp_ack_num, 0);
}

void wget_success(u8 action, unsigned int tcp_seq_num,
		  unsigned int tcp_ack_num, int len, int packets)
{
	printf("Packets received %d, Transfer Successful\n", packets);
	wget_send(action, tcp_seq_num, tcp_ack_num, len);
}

/*
 * Interfaces of U-BOOT
 */
static void wget_timeout_handler(void)
{
	if (++wget_timeout_count > WGET_RETRY_COUNT) {
		puts("\nRetry count exceeded; starting again\n");
		wget_send(TCP_RST, 0, 0, 0);
		net_start_again();
	} else {
		puts("T ");
		net_set_timeout_handler(wget_timeout +
					WGET_TIMEOUT * wget_timeout_count,
					wget_timeout_handler);
		wget_send_stored();
	}
}

#define PKT_QUEUE_OFFSET 0x20000
#define PKT_QUEUE_PACKET_SIZE 0x800

static void wget_connected(uchar *pkt, unsigned int tcp_seq_num,
			   struct in_addr action_and_state,
			   unsigned int tcp_ack_num, unsigned int len)
{
	u8 action = action_and_state.s_addr;
	uchar *pkt_in_q;
	char *pos;
	int hlen, i;
	uchar *ptr1;

	pkt[len] = '\0';
	pos = strstr((char *)pkt, http_eom);

	if (!pos) {
		debug_cond(DEBUG_WGET,
			   "wget: Connected, data before Header %p\n", pkt);
		pkt_in_q = (void *)image_load_addr + PKT_QUEUE_OFFSET +
			(pkt_q_idx * PKT_QUEUE_PACKET_SIZE);

		ptr1 = map_sysmem((phys_addr_t)pkt_in_q, len);
		memcpy(ptr1, pkt, len);
		unmap_sysmem(ptr1);

		pkt_q[pkt_q_idx].pkt = pkt_in_q;
		pkt_q[pkt_q_idx].tcp_seq_num = tcp_seq_num;
		pkt_q[pkt_q_idx].len = len;
		pkt_q_idx++;
	} else {
		debug_cond(DEBUG_WGET, "wget: Connected HTTP Header %p\n", pkt);
		/* sizeof(http_eom) - 1 is the string length of (http_eom) */
		hlen = pos - (char *)pkt + sizeof(http_eom) - 1;
		pos = strstr((char *)pkt, linefeed);
		if (pos > 0)
			i = pos - (char *)pkt;
		else
			i = hlen;
		printf("%.*s", i,  pkt);

		current_wget_state = WGET_TRANSFERRING;

		if (strstr((char *)pkt, http_ok) == 0) {
			debug_cond(DEBUG_WGET,
				   "wget: Connected Bad Xfer\n");
			initial_data_seq_num = tcp_seq_num + hlen;
			wget_loop_state = NETLOOP_FAIL;
			wget_send(action, tcp_seq_num, tcp_ack_num, len);
		} else {
			debug_cond(DEBUG_WGET,
				   "wget: Connctd pkt %p  hlen %x\n",
				   pkt, hlen);
			initial_data_seq_num = tcp_seq_num + hlen;

			pos = strstr((char *)pkt, content_len);
			if (!pos) {
				content_length = -1;
			} else {
				pos += sizeof(content_len) + 2;
				strict_strtoul(pos, 10, &content_length);
				debug_cond(DEBUG_WGET,
					   "wget: Connected Len %lu\n",
					   content_length);
			}

			net_boot_file_size = 0;

			if (len > hlen)
				store_block(pkt + hlen, 0, len - hlen);

			debug_cond(DEBUG_WGET,
				   "wget: Connected Pkt %p hlen %x\n",
				   pkt, hlen);

			for (i = 0; i < pkt_q_idx; i++) {
				ptr1 = map_sysmem(
					(phys_addr_t)(pkt_q[i].pkt),
					pkt_q[i].len);
				store_block(ptr1,
					    pkt_q[i].tcp_seq_num -
					    initial_data_seq_num,
					    pkt_q[i].len);
				unmap_sysmem(ptr1);
				debug_cond(DEBUG_WGET,
					   "wget: Connctd pkt Q %p len %x\n",
					   pkt_q[i].pkt, pkt_q[i].len);
			}
		}
	}
	wget_send(action, tcp_seq_num, tcp_ack_num, len);
}

/**
 * wget_handler() - handler of wget
 * @pkt: the pointer to the payload
 * @tcp_seq_num: tcp sequence number
 * @action_and_state: TCP state
 * @tcp_ack_num: tcp acknowledge number
 * @len: length of the payload
 *
 * In the "application push" invocation, the TCP header with all
 * its information is pointed to by the packet pointer.
 */
static void wget_handler(uchar *pkt, unsigned int tcp_seq_num,
			 struct in_addr action_and_state,
			 unsigned int tcp_ack_num, unsigned int len)
{
	enum tcp_state wget_tcp_state = tcp_get_tcp_state();
	u8 action = action_and_state.s_addr;

	net_set_timeout_handler(wget_timeout, wget_timeout_handler);
	packets++;

	switch (current_wget_state) {
	case WGET_CLOSED:
		debug_cond(DEBUG_WGET, "wget: Handler: Error!, State wrong\n");
		break;
	case WGET_CONNECTING:
		debug_cond(DEBUG_WGET,
			   "wget: Connecting In len=%x, Seq=%x, Ack=%x\n",
			   len, tcp_seq_num, tcp_ack_num);
		if (!len) {
			if (wget_tcp_state == TCP_ESTABLISHED) {
				debug_cond(DEBUG_WGET,
					   "wget: Cting, send, len=%x\n", len);
				wget_send(action, tcp_seq_num, tcp_ack_num,
					  len);
			} else {
				printf("%.*s", len,  pkt);
				wget_fail("wget: Handler Connected Fail\n",
					  tcp_seq_num, tcp_ack_num, action);
			}
		}
		break;
	case WGET_CONNECTED:
		debug_cond(DEBUG_WGET, "wget: Connected seq=%x, len=%x\n",
			   tcp_seq_num, len);
		if (!len) {
			wget_fail("Image not found, no data returned\n",
				  tcp_seq_num, tcp_ack_num, action);
		} else {
			wget_connected(pkt, tcp_seq_num, action_and_state,
				       tcp_ack_num, len);
		}
		break;
	case WGET_TRANSFERRING:
		debug_cond(DEBUG_WGET,
			   "wget: Transferring, seq=%x, ack=%x,len=%x\n",
			   tcp_seq_num, tcp_ack_num, len);

		if (tcp_seq_num >= initial_data_seq_num &&
		    store_block(pkt, tcp_seq_num - initial_data_seq_num,
				len) != 0) {
			wget_fail("wget: store error\n",
				  tcp_seq_num, tcp_ack_num, action);
			return;
		}

		switch (wget_tcp_state) {
		case TCP_FIN_WAIT_2:
			wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num, len);
			fallthrough;
		case TCP_SYN_SENT:
		case TCP_CLOSING:
		case TCP_FIN_WAIT_1:
		case TCP_CLOSED:
			net_set_state(NETLOOP_FAIL);
			break;
		case TCP_ESTABLISHED:
			wget_send(TCP_ACK, tcp_seq_num, tcp_ack_num,
				  len);
			wget_loop_state = NETLOOP_SUCCESS;
			break;
		case TCP_CLOSE_WAIT:     /* End of transfer */
			current_wget_state = WGET_TRANSFERRED;
			wget_send(action | TCP_ACK | TCP_FIN,
				  tcp_seq_num, tcp_ack_num, len);
			break;
		}
		break;
	case WGET_TRANSFERRED:
		printf("Packets received %d, Transfer Successful\n", packets);
		net_set_state(wget_loop_state);
		break;
	}
}

#define RANDOM_PORT_START 1024
#define RANDOM_PORT_RANGE 0x4000

/**
 * random_port() - make port a little random (1024-17407)
 *
 * Return: random port number from 1024 to 17407
 *
 * This keeps the math somewhat trivial to compute, and seems to work with
 * all supported protocols/clients/servers
 */
static unsigned int random_port(void)
{
	return RANDOM_PORT_START + (get_timer(0) % RANDOM_PORT_RANGE);
}

#define BLOCKSIZE 512

void wget_start(void)
{
	image_url = strchr(net_boot_file_name, ':');
	if (image_url > 0) {
		web_server_ip = string_to_ip(net_boot_file_name);
		++image_url;
		net_server_ip = web_server_ip;
	} else {
		web_server_ip = net_server_ip;
		image_url = net_boot_file_name;
	}

	debug_cond(DEBUG_WGET,
		   "wget: Transfer HTTP Server %pI4; our IP %pI4\n",
		   &web_server_ip, &net_ip);

	/* Check if we need to send across this subnet */
	if (net_gateway.s_addr && net_netmask.s_addr) {
		struct in_addr our_net;
		struct in_addr server_net;

		our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
		server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
		if (our_net.s_addr != server_net.s_addr)
			debug_cond(DEBUG_WGET,
				   "wget: sending through gateway %pI4",
				   &net_gateway);
	}
	debug_cond(DEBUG_WGET, "URL '%s'\n", image_url);

	if (net_boot_file_expected_size_in_blocks) {
		debug_cond(DEBUG_WGET, "wget: Size is 0x%x Bytes = ",
			   net_boot_file_expected_size_in_blocks * BLOCKSIZE);
		print_size(net_boot_file_expected_size_in_blocks * BLOCKSIZE,
			   "");
	}
	debug_cond(DEBUG_WGET,
		   "\nwget:Load address: 0x%lx\nLoading: *\b", image_load_addr);

	net_set_timeout_handler(wget_timeout, wget_timeout_handler);
	tcp_set_tcp_handler(wget_handler);

	wget_timeout_count = 0;
	current_wget_state = WGET_CLOSED;

	our_port = random_port();

	/*
	 * Zero out server ether to force arp resolution in case
	 * the server ip for the previous u-boot command, for example dns
	 * is not the same as the web server ip.
	 */

	memset(net_server_ethaddr, 0, 6);

	wget_send(TCP_SYN, 0, 0, 0);
}