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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2004
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7#include <command.h>
8#include <env.h>
9#include <log.h>
10#include <stdio_dev.h>
11#include <net.h>
12#include <vsprintf.h>
13
14#ifndef CFG_NETCONSOLE_BUFFER_SIZE
15#define CFG_NETCONSOLE_BUFFER_SIZE 512
16#endif
17
18static char input_buffer[CFG_NETCONSOLE_BUFFER_SIZE];
19static int input_size; /* char count in input buffer */
20static int input_offset; /* offset to valid chars in input buffer */
21static int input_recursion;
22static int output_recursion;
23static int net_timeout;
24static uchar nc_ether[6]; /* server enet address */
25static struct in_addr nc_ip; /* server ip */
26static short nc_out_port; /* target output port */
27static short nc_in_port; /* source input port */
28static const char *output_packet; /* used by first send udp */
29static int output_packet_len;
30/*
31 * Start with a default last protocol.
32 * We are only interested in NETCONS or not.
33 */
34enum proto_t net_loop_last_protocol = BOOTP;
35
36static void nc_wait_arp_handler(uchar *pkt, unsigned dest,
37 struct in_addr sip, unsigned src,
38 unsigned len)
39{
40 net_set_state(NETLOOP_SUCCESS); /* got arp reply - quit net loop */
41}
42
43static void nc_handler(uchar *pkt, unsigned dest, struct in_addr sip,
44 unsigned src, unsigned len)
45{
46 if (input_size)
47 net_set_state(NETLOOP_SUCCESS); /* got input - quit net loop */
48}
49
50static void nc_timeout_handler(void)
51{
52 net_set_state(NETLOOP_SUCCESS);
53}
54
55static int is_broadcast(struct in_addr ip)
56{
57 static struct in_addr netmask;
58 static struct in_addr our_ip;
59 static int env_changed_id;
60 int env_id = env_get_id();
61
62 /* update only when the environment has changed */
63 if (env_changed_id != env_id) {
64 netmask = env_get_ip("netmask");
65 our_ip = env_get_ip("ipaddr");
66
67 env_changed_id = env_id;
68 }
69
70 return (ip.s_addr == ~0 || /* 255.255.255.255 (global bcast) */
71 ((netmask.s_addr & our_ip.s_addr) ==
72 (netmask.s_addr & ip.s_addr) && /* on the same net and */
73 (netmask.s_addr | ip.s_addr) == ~0)); /* bcast to our net */
74}
75
76static int refresh_settings_from_env(void)
77{
78 const char *p;
79 static int env_changed_id;
80 int env_id = env_get_id();
81
82 /* update only when the environment has changed */
83 if (env_changed_id != env_id) {
84 if (env_get("ncip")) {
85 nc_ip = env_get_ip("ncip");
86 if (!nc_ip.s_addr)
87 return -1; /* ncip is 0.0.0.0 */
88 p = strchr(env_get("ncip"), ':');
89 if (p != NULL) {
90 nc_out_port = dectoul(p + 1, NULL);
91 nc_in_port = nc_out_port;
92 }
93 } else {
94 nc_ip.s_addr = ~0; /* ncip is not set, so broadcast */
95 }
96
97 p = env_get("ncoutport");
98 if (p != NULL)
99 nc_out_port = dectoul(p, NULL);
100 p = env_get("ncinport");
101 if (p != NULL)
102 nc_in_port = dectoul(p, NULL);
103
104 if (is_broadcast(nc_ip))
105 /* broadcast MAC address */
106 memset(nc_ether, 0xff, sizeof(nc_ether));
107 else
108 /* force arp request */
109 memset(nc_ether, 0, sizeof(nc_ether));
110 }
111 return 0;
112}
113
114/**
115 * Called from net_loop in net/net.c before each packet
116 */
117void nc_start(void)
118{
119 refresh_settings_from_env();
120 if (!output_packet_len || memcmp(nc_ether, net_null_ethaddr, 6)) {
121 /* going to check for input packet */
122 net_set_udp_handler(nc_handler);
123 net_set_timeout_handler(net_timeout, nc_timeout_handler);
124 } else {
125 /* send arp request */
126 uchar *pkt;
127 net_set_arp_handler(nc_wait_arp_handler);
128 pkt = (uchar *)net_tx_packet + net_eth_hdr_size() +
129 IP_UDP_HDR_SIZE;
130 memcpy(pkt, output_packet, output_packet_len);
131 net_send_udp_packet(nc_ether, nc_ip, nc_out_port, nc_in_port,
132 output_packet_len);
133 }
134}
135
136int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
137 unsigned src_port, unsigned len)
138{
139 int end, chunk;
140
141 if (dest_port != nc_in_port || !len)
142 return 0; /* not for us */
143
144 if (src_ip.s_addr != nc_ip.s_addr && !is_broadcast(nc_ip))
145 return 0; /* not from our client */
146
147 debug_cond(DEBUG_DEV_PKT, "input: \"%*.*s\"\n", len, len, pkt);
148
149 if (input_size == sizeof(input_buffer))
150 return 1; /* no space */
151 if (len > sizeof(input_buffer) - input_size)
152 len = sizeof(input_buffer) - input_size;
153
154 end = input_offset + input_size;
155 if (end >= sizeof(input_buffer))
156 end -= sizeof(input_buffer);
157
158 chunk = len;
159 /* Check if packet will wrap in input_buffer */
160 if (end + len >= sizeof(input_buffer)) {
161 chunk = sizeof(input_buffer) - end;
162 /* Copy the second part of the pkt to start of input_buffer */
163 memcpy(input_buffer, pkt + chunk, len - chunk);
164 }
165 /* Copy first (or only) part of pkt after end of current valid input*/
166 memcpy(input_buffer + end, pkt, chunk);
167
168 input_size += len;
169
170 return 1;
171}
172
173static void nc_send_packet(const char *buf, int len)
174{
175 struct udevice *eth;
176 int inited = 0;
177 uchar *pkt;
178 uchar *ether;
179 struct in_addr ip;
180
181 debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
182
183 eth = eth_get_dev();
184 if (eth == NULL)
185 return;
186
187 if (!memcmp(nc_ether, net_null_ethaddr, 6)) {
188 if (eth_is_active(eth))
189 return; /* inside net loop */
190 output_packet = buf;
191 output_packet_len = len;
192 input_recursion = 1;
193 net_loop(NETCONS); /* wait for arp reply and send packet */
194 input_recursion = 0;
195 output_packet_len = 0;
196 return;
197 }
198
199 if (!eth_is_active(eth)) {
200 if (eth_is_on_demand_init()) {
201 if (eth_init() < 0)
202 return;
203 eth_set_last_protocol(NETCONS);
204 } else {
205 eth_init_state_only();
206 }
207
208 inited = 1;
209 }
210 pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
211 memcpy(pkt, buf, len);
212 ether = nc_ether;
213 ip = nc_ip;
214 net_send_udp_packet(ether, ip, nc_out_port, nc_in_port, len);
215
216 if (inited) {
217 if (eth_is_on_demand_init())
218 eth_halt();
219 else
220 eth_halt_state_only();
221 }
222}
223
224static int nc_stdio_start(struct stdio_dev *dev)
225{
226 int retval;
227
228 nc_out_port = 6666; /* default port */
229 nc_in_port = nc_out_port;
230
231 retval = refresh_settings_from_env();
232 if (retval != 0)
233 return retval;
234
235 /*
236 * Initialize the static IP settings and buffer pointers
237 * incase we call net_send_udp_packet before net_loop
238 */
239 net_init();
240
241 return 0;
242}
243
244static void nc_stdio_putc(struct stdio_dev *dev, char c)
245{
246 if (output_recursion)
247 return;
248 output_recursion = 1;
249
250 nc_send_packet(&c, 1);
251
252 output_recursion = 0;
253}
254
255static void nc_stdio_puts(struct stdio_dev *dev, const char *s)
256{
257 int len;
258
259 if (output_recursion)
260 return;
261 output_recursion = 1;
262
263 len = strlen(s);
264 while (len) {
265 int send_len = min(len, (int)sizeof(input_buffer));
266 nc_send_packet(s, send_len);
267 len -= send_len;
268 s += send_len;
269 }
270
271 output_recursion = 0;
272}
273
274static int nc_stdio_getc(struct stdio_dev *dev)
275{
276 uchar c;
277
278 input_recursion = 1;
279
280 net_timeout = 0; /* no timeout */
281 while (!input_size)
282 net_loop(NETCONS);
283
284 input_recursion = 0;
285
286 c = input_buffer[input_offset++];
287
288 if (input_offset >= sizeof(input_buffer))
289 input_offset -= sizeof(input_buffer);
290 input_size--;
291
292 return c;
293}
294
295static int nc_stdio_tstc(struct stdio_dev *dev)
296{
297 struct udevice *eth;
298
299 if (input_recursion)
300 return 0;
301
302 if (input_size)
303 return 1;
304
305 eth = eth_get_dev();
306 if (eth_is_active(eth))
307 return 0; /* inside net loop */
308
309 input_recursion = 1;
310
311 net_timeout = 1;
312 net_loop(NETCONS); /* kind of poll */
313
314 input_recursion = 0;
315
316 return input_size != 0;
317}
318
319int drv_nc_init(void)
320{
321 struct stdio_dev dev;
322 int rc;
323
324 memset(&dev, 0, sizeof(dev));
325
326 strcpy(dev.name, "nc");
327 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
328 dev.start = nc_stdio_start;
329 dev.putc = nc_stdio_putc;
330 dev.puts = nc_stdio_puts;
331 dev.getc = nc_stdio_getc;
332 dev.tstc = nc_stdio_tstc;
333
334 rc = stdio_register(&dev);
335
336 return (rc == 0) ? 1 : rc;
337}