122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010,2011,2012,2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/net/netbuff.h>
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#include <sys/socket.h>
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#include <grub/net.h>
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#include <sys/types.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <grub/term.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static int fd;
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static grub_err_t
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send_card_buffer (struct grub_net_card *dev __attribute__ ((unused)),
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struct grub_net_buff *pack)
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{
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ssize_t actual;
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actual = write (fd, pack->data, pack->tail - pack->data);
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if (actual < 0)
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return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
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return GRUB_ERR_NONE;
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}
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static struct grub_net_buff *
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get_card_packet (struct grub_net_card *dev __attribute__ ((unused)))
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{
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ssize_t actual;
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struct grub_net_buff *nb;
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nb = grub_netbuff_alloc (1536 + 2);
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if (!nb)
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return NULL;
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/* Reserve 2 bytes so that 2 + 14/18 bytes of ethernet header is divisible
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by 4. So that IP header is aligned on 4 bytes. */
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grub_netbuff_reserve (nb, 2);
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if (!nb)
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{
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grub_netbuff_free (nb);
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return NULL;
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}
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actual = read (fd, nb->data, 1536);
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if (actual < 0)
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{
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grub_netbuff_free (nb);
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return NULL;
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}
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grub_netbuff_put (nb, actual);
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return nb;
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}
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static struct grub_net_card_driver emudriver =
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{
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.name = "emu",
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.send = send_card_buffer,
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.recv = get_card_packet
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};
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static struct grub_net_card emucard =
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{
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.name = "emu0",
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.driver = &emudriver,
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.mtu = 1500,
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.default_address = {
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.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET,
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{.mac = {0, 1, 2, 3, 4, 5}}
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},
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.flags = 0
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};
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GRUB_MOD_INIT(emunet)
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{
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struct ifreq ifr;
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fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK);
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if (fd < 0)
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return;
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grub_memset (&ifr, 0, sizeof (ifr));
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (ioctl (fd, TUNSETIFF, &ifr) < 0)
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{
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close (fd);
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fd = -1;
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return;
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}
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grub_net_card_register (&emucard);
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}
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GRUB_MOD_FINI(emunet)
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{
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if (fd >= 0)
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{
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close (fd);
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grub_net_card_unregister (&emucard);
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}
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}
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