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Diffstat (limited to 'net/netconsole.c')
| -rw-r--r-- | net/netconsole.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/net/netconsole.c b/net/netconsole.c new file mode 100644 index 0000000000..07e6a6cf27 --- /dev/null +++ b/net/netconsole.c @@ -0,0 +1,228 @@ +/* + * netconsole.c - network console support + * + * Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> +#include <fs.h> +#include <linux/stat.h> +#include <errno.h> +#include <malloc.h> +#include <getopt.h> +#include <stringlist.h> +#include <net.h> +#include <kfifo.h> +#include <init.h> +#include <linux/err.h> + +/** + * @file + * @brief Network console support + */ + +struct nc_priv { + struct console_device cdev; + struct kfifo *fifo; + int busy; + struct net_connection *con; + + uint16_t port; + IPaddr_t ip; +}; + +static struct nc_priv *g_priv; + +static void nc_handler(char *pkt, unsigned len) +{ + struct nc_priv *priv = g_priv; + unsigned char *packet = net_eth_to_udp_payload(pkt); + + kfifo_put(priv->fifo, packet, net_eth_to_udplen(pkt)); +} + +static int nc_init(void) +{ + struct nc_priv *priv = g_priv; + + if (priv->con) + net_unregister(priv->con); + + priv->con = net_udp_new(priv->ip, priv->port, nc_handler); + if (IS_ERR(priv->con)) { + int ret = PTR_ERR(priv->con); + priv->con = NULL; + return ret; + } + + net_udp_bind(priv->con, priv->port); + priv->cdev.f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR; + return 0; +} + +static int nc_getc(struct console_device *cdev) +{ + struct nc_priv *priv = container_of(cdev, + struct nc_priv, cdev); + unsigned char c; + + while (!kfifo_len(priv->fifo)) + net_poll(); + + kfifo_getc(priv->fifo, &c); + + return c; +} + +static int nc_tstc(struct console_device *cdev) +{ + struct nc_priv *priv = container_of(cdev, + struct nc_priv, cdev); + + if (priv->busy) + return kfifo_len(priv->fifo) ? 1 : 0; + + net_poll(); + + return kfifo_len(priv->fifo) ? 1 : 0; +} + +static void nc_putc(struct console_device *cdev, char c) +{ + struct nc_priv *priv = container_of(cdev, + struct nc_priv, cdev); + unsigned char *packet; + + if (!priv->con) + return; + + if (priv->busy) + return; + + packet = net_udp_get_payload(priv->con); + *packet = c; + + priv->busy = 1; + net_udp_send(priv->con, 1); + priv->busy = 0; +} + +static int nc_setbaudrate(struct console_device *cdev, int baudrate) +{ + return 0; +} + +static int nc_port_set(struct device_d *dev, struct param_d *param, + const char *val) +{ + struct nc_priv *priv = g_priv; + char portstr[16]; + int port; + + if (!val) + dev_param_set_generic(dev, param, NULL); + + port = simple_strtoul(val, NULL, 10); + if (port > 65535) + return -EINVAL; + + priv->port = port; + nc_init(); + + sprintf(portstr, "%d", port); + dev_param_set_generic(dev, param, portstr); + + return 0; +} + +static int nc_remoteip_set(struct device_d *dev, struct param_d *param, + const char *val) +{ + struct nc_priv *priv = g_priv; + IPaddr_t ip; + int ret; + + if (!val) + dev_param_set_generic(dev, param, NULL); + + if (string_to_ip(val, &ip)) + return -EINVAL; + + priv->ip = ip; + ret = nc_init(); + if (ret) + return ret; + + dev_param_set_generic(dev, param, val); + + return 0; +} + +static int netconsole_init(void) +{ + struct nc_priv *priv; + struct console_device *cdev; + + priv = xzalloc(sizeof(*priv)); + cdev = &priv->cdev; + cdev->tstc = nc_tstc; + cdev->putc = nc_putc; + cdev->getc = nc_getc; + cdev->setbrg = nc_setbaudrate; + + g_priv = priv; + + priv->fifo = kfifo_alloc(1024); + + console_register(cdev); + + dev_add_param(&cdev->class_dev, "ip", nc_remoteip_set, NULL, 0); + dev_add_param(&cdev->class_dev, "port", nc_port_set, NULL, 0); + dev_set_param(&cdev->class_dev, "port", "6666"); + + printf("registered netconsole as %s%d\n", cdev->class_dev.name, cdev->class_dev.id); + + return 0; +} + +device_initcall(netconsole_init); + +/** @page net_netconsole Network console + +@section net_netconsole Using an UDP based network console + +If enabled barebox supports a console via udp networking. There is only +one network console supported registered during init time. It is deactivated +by default because it opens great security holes, so use with care. + +To use the network console you have to configure the remote ip and the local +and remote ports. Assuming the network console is registered as cs1, it can be +configured with: + +@code +cs1.ip=<remotehost> +cs1.port=<port> +cs1.active=ioe +@endcode + +On the remote host call scripts/netconsole with bareboxes ip and port as +parameters. port is initialized to 6666 by default. + +*/ |