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/*
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2002, 2007, 2008
Free Software Foundation, Inc.
Written by Zheng Da
Based on pfinet/ethernet.c, written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd 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, USA. */
#include <string.h>
#include <error.h>
#include <assert.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <hurd/ports.h>
#include <device/device.h>
#include <device/net_status.h>
#include "ethernet.h"
#include "vdev.h"
#include "util.h"
#define ETH_HLEN 14
static struct port_info *readpt;
/* Port for writing message to the real network interface. */
mach_port_t ether_port;
/* The ethernet address of the real network interface. */
char ether_address[ETH_ALEN];
/* Port for receiving messages from the interface. */
static mach_port_t readptname;
/* The BPF instruction allows IP and ARP packets */
static struct bpf_insn ether_filter[] =
{
{NETF_IN|NETF_BPF, /* Header. */ 0, 0, 0},
{40, 0, 0, 12},
{21, 1, 0, 2054},
{21, 0, 1, 2048},
{6, 0, 0, 1500},
{6, 0, 0, 0}
};
static int ether_filter_len = sizeof (ether_filter) / sizeof (short);
int ethernet_demuxer (mach_msg_header_t *inp,
mach_msg_header_t *outp)
{
struct net_rcv_msg *msg = (struct net_rcv_msg *) inp;
if (inp->msgh_id != NET_RCV_MSG_ID)
return 0;
broadcast_msg (msg);
/* The data from the underlying network is inside the message,
* so we don't need to deallocate the data. */
return 1;
}
int set_promisc (char *dev_name, mach_port_t ether_port, int is_promisc)
{
#ifndef NET_FLAGS
#define NET_FLAGS (('n'<<16) + 4)
#endif
int flags;
int ret;
size_t count;
debug ("set_promisc is called, is_promisc: %d\n", is_promisc);
count = 1;
ret = device_get_status (ether_port, NET_FLAGS, (dev_status_t) &flags,
&count);
if (ret)
{
error (0, ret, "device_get_status");
return -1;
}
if (is_promisc)
flags |= IFF_PROMISC;
else
flags &= ~IFF_PROMISC;
ret = device_set_status(ether_port, NET_FLAGS, (dev_status_t) &flags, 1);
if (ret)
{
error (0, ret, "device_set_status");
return -1;
}
return 0;
}
static error_t
get_ethernet_address (mach_port_t port, char *address)
{
error_t err;
int net_address[2];
size_t count = 2;
assert (count * sizeof (int) >= ETH_ALEN);
err = device_get_status (port, NET_ADDRESS, net_address, &count);
if (err)
return err;
net_address[0] = ntohl (net_address[0]);
net_address[1] = ntohl (net_address[1]);
memcpy (address, net_address, ETH_ALEN);
return 0;
}
int ethernet_open (char *dev_name, device_t master_device,
struct port_bucket *etherport_bucket,
struct port_class *etherreadclass)
{
error_t err;
assert (ether_port == MACH_PORT_NULL);
err = ports_create_port (etherreadclass, etherport_bucket,
sizeof (struct port_info), &readpt);
if (err)
error (2, err, "ports_create_port");
readptname = ports_get_right (readpt);
mach_port_insert_right (mach_task_self (), readptname, readptname,
MACH_MSG_TYPE_MAKE_SEND);
mach_port_set_qlimit (mach_task_self (), readptname, MACH_PORT_QLIMIT_MAX);
err = device_open (master_device, D_WRITE | D_READ, "eth", ðer_port);
mach_port_deallocate (mach_task_self (), master_device);
if (err)
error (2, err, "device_open: %s", dev_name);
err = device_set_filter (ether_port, ports_get_right (readpt),
MACH_MSG_TYPE_MAKE_SEND, 0,
(unsigned short *)ether_filter, ether_filter_len);
if (err)
error (2, err, "device_set_filter: %s", dev_name);
set_promisc (dev_name, ether_port, 1);
err = get_ethernet_address (ether_port, ether_address);
if (err)
error (2, err, "%s: Cannot get hardware Ethernet address", dev_name);
return 0;
}
int ethernet_close (char *dev_name)
{
set_promisc (dev_name, ether_port, 0);
return 0;
}
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