u-boot/drivers/net/netconsole.c

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/*
* (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
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 */
static 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
/* 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)
{
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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)
{
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uchar c;
input_recursion = 1;
net_timeout = 0; /* no timeout */
while (!input_size)
NetLoop(NETCONS);
input_recursion = 0;
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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;
}